Merge pull request #312 from cbeuw/renovate/github.com-refraction-networking-utls-1.x

Update utls and increase server first packet buffer size

.github/workflows/build.yml

@@ -0,0 +1,91 @@
+name: Build and test
+on: [ push ]
+jobs:
+  build:
+    runs-on: ${{ matrix.os }}
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '^1.24' # The Go version to download (if necessary) and use.
+      - run: go test -race -coverprofile coverage.txt -coverpkg ./... -covermode atomic ./...
+      - uses: codecov/codecov-action@v4
+        with:
+          files: coverage.txt
+          token: ${{ secrets.CODECOV_TOKEN }}
+
+  compat-test:
+    runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        encryption-method: [ plain, chacha20-poly1305 ]
+        num-conn: [ 0, 1, 4 ]
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-go@v5
+        with:
+          go-version: '^1.24'
+      - name: Build Cloak
+        run: make
+      - name: Create configs
+        run: |
+          mkdir config
+          cat << EOF > config/ckclient.json
+            {
+              "Transport": "direct",
+              "ProxyMethod": "iperf",
+              "EncryptionMethod": "${{ matrix.encryption-method }}",
+              "UID": "Q4GAXHVgnDLXsdTpw6bmoQ==",
+              "PublicKey": "4dae/bF43FKGq+QbCc5P/E/MPM5qQeGIArjmJEHiZxc=",
+              "ServerName": "cloudflare.com",
+              "BrowserSig": "firefox",
+              "NumConn": ${{ matrix.num-conn }}
+            }
+          EOF
+          cat << EOF > config/ckserver.json
+            {
+              "ProxyBook": {
+                "iperf": [
+                  "tcp",
+                  "127.0.0.1:5201"
+                ]
+              },
+              "BindAddr": [
+                ":8443"
+              ],
+              "BypassUID": [
+                "Q4GAXHVgnDLXsdTpw6bmoQ=="
+              ],
+              "RedirAddr": "cloudflare.com",
+              "PrivateKey": "AAaskZJRPIAbiuaRLHsvZPvE6gzOeSjg+ZRg1ENau0Y="
+            }
+          EOF
+      - name: Start iperf3 server
+        run: docker run -d --name iperf-server --network host ajoergensen/iperf3:latest --server
+      - name: Test new client against old server
+        run: |
+          docker run -d --name old-cloak-server --network host -v $PWD/config:/go/Cloak/config cbeuw/cloak:latest build/ck-server -c config/ckserver.json --verbosity debug
+          build/ck-client -c config/ckclient.json -s 127.0.0.1 -p 8443 --verbosity debug | tee new-cloak-client.log &
+          docker run --network host ajoergensen/iperf3:latest --client 127.0.0.1 -p 1984
+          docker stop old-cloak-server
+      - name: Test old client against new server
+        run: |
+          build/ck-server -c config/ckserver.json --verbosity debug | tee new-cloak-server.log &
+          docker run -d --name old-cloak-client --network host -v $PWD/config:/go/Cloak/config cbeuw/cloak:latest build/ck-client -c config/ckclient.json -s 127.0.0.1 -p 8443 --verbosity debug
+          docker run --network host ajoergensen/iperf3:latest --client 127.0.0.1 -p 1984
+          docker stop old-cloak-client
+      - name: Dump docker logs
+        if: always()
+        run: |
+          docker container logs iperf-server > iperf-server.log
+          docker container logs old-cloak-server > old-cloak-server.log
+          docker container logs old-cloak-client > old-cloak-client.log
+      - name: Upload logs
+        if: always()
+        uses: actions/upload-artifact@v4
+        with:
+          name: ${{ matrix.encryption-method }}-${{ matrix.num-conn }}-conn-logs
+          path: ./*.log

.github/workflows/release.yml

@@ -0,0 +1,50 @@
+on:
+  push:
+    tags:
+      - 'v*'
+
+name: Create Release
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build
+        run: |
+          export PATH=${PATH}:`go env GOPATH`/bin
+          v=${GITHUB_REF#refs/*/} ./release.sh
+      - name: Release
+        uses: softprops/action-gh-release@v1
+        with:
+          files: release/*
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
+  build-docker:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+      - name: Docker meta
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: |
+            cbeuw/cloak
+          tags: |
+            type=ref,event=branch
+            type=ref,event=pr
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+      - name: Login to Docker Hub
+        uses: docker/login-action@v3
+        with:
+          username: ${{ secrets.DOCKERHUB_USERNAME }}
+          password: ${{ secrets.DOCKERHUB_TOKEN }}
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}

.gitignore

@@ -1,4 +1,6 @@
 corpus/
 suppressions/
 crashers/
-*.zip
+*.zip
+.idea/
+build/

.travis.yml

@@ -1,10 +0,0 @@
-language: go
-
-go:
-  - "1.14"
-
-script:
-  - go test -race -coverprofile=coverage.txt -coverpkg=./... -covermode=atomic ./...
-
-after_success:
-  - bash <(curl -s https://codecov.io/bash)

Dockerfile

@@ -0,0 +1,5 @@
+FROM golang:latest
+
+RUN git clone https://github.com/cbeuw/Cloak.git
+WORKDIR Cloak
+RUN make

README.md

@@ -1,52 +1,75 @@
-[![Build Status](https://travis-ci.org/cbeuw/Cloak.svg?branch=master)](https://travis-ci.org/cbeuw/Cloak)
+[![Build Status](https://github.com/cbeuw/Cloak/workflows/Build%20and%20test/badge.svg)](https://github.com/cbeuw/Cloak/actions)
 [![codecov](https://codecov.io/gh/cbeuw/Cloak/branch/master/graph/badge.svg)](https://codecov.io/gh/cbeuw/Cloak)
 [![Go Report Card](https://goreportcard.com/badge/github.com/cbeuw/Cloak)](https://goreportcard.com/report/github.com/cbeuw/Cloak)
 [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=SAUYKGSREP8GL&source=url)
 
+<p align="center">
+  <img src="https://user-images.githubusercontent.com/7034308/96387206-3e214100-1198-11eb-8917-689d7c56e0cd.png" />
+  <img src="https://user-images.githubusercontent.com/7034308/155593583-f22bcfe2-ac22-4afb-9288-1a0e8a791a0d.svg" />
+</p>
 
-![logo](https://user-images.githubusercontent.com/7034308/96387206-3e214100-1198-11eb-8917-689d7c56e0cd.png)
+<p align="center">
+  <img src="https://user-images.githubusercontent.com/7034308/155629720-54dd8758-ec98-4fed-b603-623f0ad83b6c.svg" />
+</p>
 
-![diagram](https://user-images.githubusercontent.com/7034308/65385852-7eab5280-dd2b-11e9-8887-db449b250e2a.png)
+Cloak is a [pluggable transport](https://datatracker.ietf.org/meeting/103/materials/slides-103-pearg-pt-slides-01) that enhances
+traditional proxy tools like OpenVPN to evade [sophisticated censorship](https://en.wikipedia.org/wiki/Deep_packet_inspection) and [data discrimination](https://en.wikipedia.org/wiki/Net_bias).
 
-Cloak is a [pluggable transport](https://www.ietf.org/proceedings/103/slides/slides-103-pearg-pt-slides-01) that works alongside traditional proxy tools like OpenVPN to evade deep-packet-inspection based censorship.
+Cloak is not a standalone proxy program. Rather, it works by masquerading proxied traffic as normal web browsing
+activities. In contrast to traditional tools which have very prominent traffic fingerprints and can be blocked by simple filtering rules,
+it's very difficult to precisely target Cloak with little false positives. This increases the collateral damage to censorship actions as
+attempts to block Cloak could also damage services the censor state relies on.
 
-Cloak is not a standalone proxy program. Rather, it works by masquerading proxy tool's traffic as normal web browsing traffic. In contrast to traditional tools which have very prominent traffic "fingerprints", it's very difficult to precisely target Cloak with little false positives. This increases the collateral damage to censorship actions as attempts to block Cloak could also damage services the censor state relies on.
+To any third party observer, a host running Cloak server is indistinguishable from an innocent web server. Both while
+passively observing traffic flow to and from the server, as well as while actively probing the behaviours of a Cloak
+server. This is achieved through the use a series
+of [cryptographic steganography techniques](https://github.com/cbeuw/Cloak/wiki/Steganography-and-encryption).
 
-To a third party observer, a host running Cloak server is indistinguishable from an innocent web server. Both while passively observing traffic flow to and from the server, as well as while actively probing the behaviours of a Cloak server. This is achieved through the use a series of [cryptographic stegnatography techniques](https://github.com/cbeuw/Cloak/wiki/Steganography-and-encryption).
+Cloak can be used in conjunction with any proxy program that tunnels traffic through TCP or
+UDP, such as Shadowsocks, OpenVPN and Tor. Multiple proxy servers can be running on the same server host and
+Cloak server will act as a reverse proxy, bridging clients with their desired proxy end.
 
-Since Cloak is transparent, it can be used in conjunction with any proxy software that tunnels traffic through TCP or UDP, such as Shadowsocks, OpenVPN and Tor. Multiple proxy servers can be running on the same server host machine and Cloak server will act as a reverse proxy, bridging clients with their desired proxy end.
+Cloak multiplexes traffic through multiple underlying TCP connections which reduces head-of-line blocking and eliminates
+TCP handshake overhead. This also makes the traffic pattern more similar to real websites.
 
-Cloak multiplexes traffic through multiple underlying TCP connections which reduces head-of-line blocking and eliminates TCP handshake overhead. This also makes the traffic pattern more similar to real websites.
+Cloak provides multi-user support, allowing multiple clients to connect to the proxy server on the same port (443 by
+default). It also provides traffic management features such as usage credit and bandwidth control. This allows a proxy
+server to serve multiple users even if the underlying proxy software wasn't designed for multiple users
 
-Cloak provides multi-user support, allowing multiple clients to connect to the proxy server on the same port (443 by default). It also provides traffic management features such as usage credit and bandwidth control. This allows a proxy server to serve multiple users even if the underlying proxy software wasn't designed for multiple users
+Cloak also supports tunneling through an intermediary CDN server such as Amazon Cloudfront. Such services are so widely used,
+attempts to disrupt traffic to them can lead to very high collateral damage for the censor.
 
-Cloak has two modes of [_Transport_](https://github.com/cbeuw/Cloak/wiki/CDN-mode): `direct` and `CDN`. Clients can either connect to the host running Cloak server directly, or it can instead connect to a CDN edge server, which may be used by many other websites as well, thus further increases the collateral damage to censorship. 
+## Quick Start
+
+To quickly deploy Cloak with Shadowsocks on a server, you can run
+this [script](https://github.com/HirbodBehnam/Shadowsocks-Cloak-Installer/blob/master/Cloak2-Installer.sh) written by
+@HirbodBehnam
 
 Table of Contents
 =================
+
 * [Quick Start](#quick-start)
 * [Build](#build)
 * [Configuration](#configuration)
     * [Server](#server)
     * [Client](#client)
 * [Setup](#setup)
-    * [For the administrator of the server](#for-the-administrator-of-the-server)
+    * [Server](#server-1)
         * [To add users](#to-add-users)
             * [Unrestricted users](#unrestricted-users)
             * [Users subject to bandwidth and credit controls](#users-subject-to-bandwidth-and-credit-controls)
-    * [Instructions for clients](#instructions-for-clients)
+    * [Client](#client-1)
 * [Support me](#support-me)
 
-## Quick Start
-To quickly deploy Cloak with Shadowsocks on a server, you can run this [script](https://github.com/HirbodBehnam/Shadowsocks-Cloak-Installer/blob/master/Cloak2-Installer.sh) written by @HirbodBehnam 
-
 ## Build
+
 ```bash
 git clone https://github.com/cbeuw/Cloak
 cd Cloak
-go get -u ./...
+go get ./...
 make
 ```
+
 Built binaries will be in `build` folder.
 
 ## Configuration
@@ -54,89 +77,163 @@ Built binaries will be in `build` folder.
 Examples of configuration files can be found under `example_config` folder.
 
 ### Server
-`RedirAddr` is the redirection address when the incoming traffic is not from a Cloak client. Ideally it should be set to a major website allowed by the censor (e.g. `www.bing.com`)
 
-`BindAddr` is a list of addresses Cloak will bind and listen to (e.g. `[":443",":80"]` to listen to port 443 and 80 on all interfaces)
+`RedirAddr` is the redirection address when the incoming traffic is not from a Cloak client. Ideally it should be set to
+a major website allowed by the censor (e.g. `www.bing.com`)
 
-`ProxyBook` is an object whose key is the name of the ProxyMethod used on the client-side (case-sensitive). Its value is an array whose first element is the protocol, and the second element is an `IP:PORT` string of the upstream proxy server that Cloak will forward the traffic to.
+`BindAddr` is a list of addresses Cloak will bind and listen to (e.g. `[":443",":80"]` to listen to port 443 and 80 on
+all interfaces)
+
+`ProxyBook` is an object whose key is the name of the ProxyMethod used on the client-side (case-sensitive). Its value is
+an array whose first element is the protocol, and the second element is an `IP:PORT` string of the upstream proxy server
+that Cloak will forward the traffic to.
 
 Example:
+
 ```json
 {
-    "ProxyBook": {
+  "ProxyBook": {
-        "shadowsocks": [ "tcp", "localhost:51443" ],
+    "shadowsocks": [
-        "openvpn": [ "tcp", "localhost:12345" ]
+      "tcp",
-    }
+      "localhost:51443"
+    ],
+    "openvpn": [
+      "tcp",
+      "localhost:12345"
+    ]
+  }
 }
 ```
 
 `PrivateKey` is the static curve25519 Diffie-Hellman private key encoded in base64.
 
-`AdminUID` is the UID of the admin user in base64.
-
 `BypassUID` is a list of UIDs that are authorised without any bandwidth or credit limit restrictions
 
-`DatabasePath` is the path to `userinfo.db`. If `userinfo.db` doesn't exist in this directory, Cloak will create one automatically. **If Cloak is started as a Shadowsocks plugin and Shadowsocks is started with its working directory as / (e.g. starting ss-server with systemctl), you need to set this field as an absolute path to a desired folder. If you leave it as default then Cloak will attempt to create userinfo.db under /, which it doesn't have the permission to do so and will raise an error. See Issue #13.**
+`AdminUID` is the UID of the admin user in base64. You can leave this empty if you only ever add users to `BypassUID`.
 
-`KeepAlive` is the number of seconds to tell the OS to wait after no activity before sending TCP KeepAlive probes to the upstream proxy server. Zero or negative value disables it. Default is 0 (disabled).
+`DatabasePath` is the path to `userinfo.db`, which is used to store user usage information and restrictions. Cloak will
+create the file automatically if it doesn't exist. You can leave this empty if you only ever add users to `BypassUID`.
+This field also has no effect if `AdminUID` isn't a valid UID or is empty.
 
-`StreamTimeout` is the number of seconds of no data sent after which the incoming Cloak client connection will be terminated. Default is 300 seconds.
+`KeepAlive` is the number of seconds to tell the OS to wait after no activity before sending TCP KeepAlive probes to the
+upstream proxy server. Zero or negative value disables it. Default is 0 (disabled).
 
 ### Client
+
 `UID` is your UID in base64.
 
-`Transport` can be either `direct` or `CDN`. If the server host wishes you to connect to it directly, use `direct`. If instead a CDN is used, use `CDN`.
+`Transport` can be either `direct` or `CDN`. If the server host wishes you to connect to it directly, use `direct`. If
+instead a CDN is used, use `CDN`.
 
 `PublicKey` is the static curve25519 public key in base64, given by the server admin.
 
-`ProxyMethod` is the name of the proxy method you are using. This must match one of the entries in the server's `ProxyBook` exactly.
+`ProxyMethod` is the name of the proxy method you are using. This must match one of the entries in the
+server's `ProxyBook` exactly.
 
-`EncryptionMethod` is the name of the encryption algorithm you want Cloak to use. Note: Cloak isn't intended to provide transport security. The point of encryption is to hide fingerprints of proxy protocols and render the payload statistically random-like. If the proxy protocol is already fingerprint-less, which is the case for Shadowsocks, this field can be left as `plain`. Options are `plain`, `aes-gcm` and `chacha20-poly1305`.
+`EncryptionMethod` is the name of the encryption algorithm you want Cloak to use. Options are `plain`, `aes-256-gcm` (
+synonymous to `aes-gcm`), `aes-128-gcm`, and `chacha20-poly1305`. Note: Cloak isn't intended to provide transport
+security. The point of encryption is to hide fingerprints of proxy protocols and render the payload statistically
+random-like. **You may only leave it as `plain` if you are certain that your underlying proxy tool already provides BOTH
+encryption and authentication (via AEAD or similar techniques).**
 
-`ServerName` is the domain you want to make your ISP or firewall _think_ you are visiting. Ideally it should match `RedirAddr` in the server's configuration, a major site the censor allows, but it doesn't have to.
+`ServerName` is the domain you want to make your ISP or firewall _think_ you are visiting. Ideally it should
+match `RedirAddr` in the server's configuration, a major site the censor allows, but it doesn't have to. Use `random` to randomize the server name for every connection made.
 
-`NumConn` is the amount of underlying TCP connections you want to use. The default of 4 should be appropriate for most people. Setting it too high will hinder the performance. Setting it to 0 will disable connection multiplexing and each TCP connection will spawn a separate short lived session that will be closed after it is terminated. This makes it behave like GoQuiet. This maybe useful for people with unstable connections.
+`AlternativeNames` is an array used alongside `ServerName` to shuffle between different ServerNames for every new
+connection. **This may conflict with `CDN` Transport mode** if the CDN provider prohibits domain fronting and rejects
+the alternative domains.
 
-`BrowserSig` is the browser you want to **appear** to be using. It's not relevant to the browser you are actually using. Currently, `chrome` and `firefox` are supported.
+Example:
 
-`KeepAlive` is the number of seconds to tell the OS to wait after no activity before sending TCP KeepAlive probes to the Cloak server. Zero or negative value disables it. Default is 0 (disabled). Warning: Enabling it might make your server more detectable as a proxy, but it will make the Cloak client detect internet interruption more quickly.
+```json
+{
+  "ServerName": "bing.com",
+  "AlternativeNames": ["cloudflare.com", "github.com"]
+}
+```
 
-`StreamTimeout` is the number of seconds of no data received after which the incoming proxy connection will be terminated. Default is 300 seconds.
+`CDNOriginHost` is the domain name of the _origin_ server (i.e. the server running Cloak) under `CDN` mode. This only
+has effect when `Transport` is set to `CDN`. If unset, it will default to the remote hostname supplied via the
+commandline argument (in standalone mode), or by Shadowsocks (in plugin mode). After a TLS session is established with
+the CDN server, this domain name will be used in the `Host` header of the HTTP request to ask the CDN server to
+establish a WebSocket connection with this host.
+
+`CDNWsUrlPath` is the url path used to build websocket request sent under `CDN` mode, and also only has effect
+when `Transport` is set to `CDN`. If unset, it will default to "/". This option is used to build the first line of the
+HTTP request after a TLS session is extablished. It's mainly for a Cloak server behind a reverse proxy, while only
+requests under specific url path are forwarded.
+
+`NumConn` is the amount of underlying TCP connections you want to use. The default of 4 should be appropriate for most
+people. Setting it too high will hinder the performance. Setting it to 0 will disable connection multiplexing and each
+TCP connection will spawn a separate short-lived session that will be closed after it is terminated. This makes it
+behave like GoQuiet. This maybe useful for people with unstable connections.
+
+`BrowserSig` is the browser you want to **appear** to be using. It's not relevant to the browser you are actually using.
+Currently, `chrome`, `firefox` and `safari` are supported.
+
+`KeepAlive` is the number of seconds to tell the OS to wait after no activity before sending TCP KeepAlive probes to the
+Cloak server. Zero or negative value disables it. Default is 0 (disabled). Warning: Enabling it might make your server
+more detectable as a proxy, but it will make the Cloak client detect internet interruption more quickly.
+
+`StreamTimeout` is the number of seconds of Cloak waits for an incoming connection from a proxy program to send any
+data, after which the connection will be closed by Cloak. Cloak will not enforce any timeout on TCP connections after it
+is established.
 
 ## Setup
-### For the administrator of the server
+
+### Server
 
 0. Install at least one underlying proxy server (e.g. OpenVPN, Shadowsocks).
 1. Download [the latest release](https://github.com/cbeuw/Cloak/releases) or clone and build this repo.
-2. Run `ck-server -k`. The base64 string before the comma is the **public** key to be given to users, the one after the comma is the **private** key to be kept secret.
+2. Run `ck-server -key`. The **public** should be given to users, the **private** key should be kept secret.
-3. Run `ck-server -u`. This will be used as the `AdminUID`.
+3. (Skip if you only want to add unrestricted users) Run `ck-server -uid`. The new UID will be used as `AdminUID`.
-4. Copy example_config/ckserver.json into a desired location. Change `PrivateKey` to the private key you just obtained; change `AdminUID` to the UID you just obtained.
+4. Copy example_config/ckserver.json into a desired location. Change `PrivateKey` to the private key you just obtained;
-5. Configure your underlying proxy server so that they all listen on localhost. Edit `ProxyBook` in the configuration file accordingly
+   change `AdminUID` to the UID you just obtained.
-6. [Configure the proxy program.](https://github.com/cbeuw/Cloak/wiki/Underlying-proxy-configuration-guides) Run `sudo ck-server -c <path to ckserver.json>`. ck-server needs root privilege because it binds to a low numbered port (443). Alternatively you can follow https://superuser.com/a/892391 to avoid granting ck-server root privilege unnecessarily.
+5. Configure your underlying proxy server so that they all listen on localhost. Edit `ProxyBook` in the configuration
+   file accordingly
+6. [Configure the proxy program.](https://github.com/cbeuw/Cloak/wiki/Underlying-proxy-configuration-guides)
+   Run `sudo ck-server -c <path to ckserver.json>`. ck-server needs root privilege because it binds to a low numbered
+   port (443). Alternatively you can follow https://superuser.com/a/892391 to avoid granting ck-server root privilege
+   unnecessarily.
 
 #### To add users
+
 ##### Unrestricted users
-Run `ck-server -u` and add the UID into the `BypassUID` field in `ckserver.json`
+
+Run `ck-server -uid` and add the UID into the `BypassUID` field in `ckserver.json`
 
 ##### Users subject to bandwidth and credit controls
-1. On your client, run `ck-client -s <IP of the server> -l <A local port> -a <AdminUID> -c <path-to-ckclient.json>` to enter admin mode
+
-2. Visit https://cbeuw.github.io/Cloak-panel (Note: this is a pure-js static site, there is no backend and all data entered into this site are processed between your browser and the Cloak API endpoint you specified. Alternatively you can download the repo at https://github.com/cbeuw/Cloak-panel and open `index.html` in a browser. No web server is required). 
+0. First make sure you have `AdminUID` generated and set in `ckserver.json`, along with a path to `userinfo.db`
+   in `DatabasePath` (Cloak will create this file for you if it didn't already exist).
+1. On your client, run `ck-client -s <IP of the server> -l <A local port> -a <AdminUID> -c <path-to-ckclient.json>` to
+   enter admin mode
+2. Visit https://cbeuw.github.io/Cloak-panel (Note: this is a pure-js static site, there is no backend and all data
+   entered into this site are processed between your browser and the Cloak API endpoint you specified. Alternatively you
+   can download the repo at https://github.com/cbeuw/Cloak-panel and open `index.html` in a browser. No web server is
+   required).
 3. Type in `127.0.0.1:<the port you entered in step 1>` as the API Base, and click `List`.
 4. You can add in more users by clicking the `+` panel
 
-Note: the user database is persistent as it's in-disk. You don't need to add the users again each time you start ck-server.
+Note: the user database is persistent as it's in-disk. You don't need to add the users again each time you start
+ck-server.
+
+### Client
 
-### Instructions for clients
 **Android client is available here: https://github.com/cbeuw/Cloak-android**
 
 0. Install the underlying proxy client corresponding to what the server has.
-1. Download [the latest release](https://github.com/cbeuw/Cloak/releases) or clone and build this repo. 
+1. Download [the latest release](https://github.com/cbeuw/Cloak/releases) or clone and build this repo.
 2. Obtain the public key and your UID from the administrator of your server
-3. Copy `example_config/ckclient.json` into a location of your choice. Enter the `UID` and `PublicKey` you have obtained. Set `ProxyMethod` to match exactly the corresponding entry in `ProxyBook` on the server end
+3. Copy `example_config/ckclient.json` into a location of your choice. Enter the `UID` and `PublicKey` you have
-4. [Configure the proxy program.](https://github.com/cbeuw/Cloak/wiki/Underlying-proxy-configuration-guides) Run `ck-client -c <path to ckclient.json> -s <ip of your server>`
+   obtained. Set `ProxyMethod` to match exactly the corresponding entry in `ProxyBook` on the server end
+4. [Configure the proxy program.](https://github.com/cbeuw/Cloak/wiki/Underlying-proxy-configuration-guides)
+   Run `ck-client -c <path to ckclient.json> -s <ip of your server>`
 
 ## Support me
-If you find this project useful, you can visit my [merch store](https://www.redbubble.com/people/cbeuw/explore); alternatively you can donate directly to me
+
+If you find this project useful, you can visit my [merch store](https://www.redbubble.com/people/cbeuw/explore);
+alternatively you can donate directly to me
 
 [![Donate](https://img.shields.io/badge/Donate-PayPal-green.svg)](https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=SAUYKGSREP8GL&source=url)
 

azure-pipelines.yml

@@ -1,84 +0,0 @@
-# Go
-# Build your Go project.
-# Add steps that test, save build artifacts, deploy, and more:
-# https://docs.microsoft.com/azure/devops/pipelines/languages/go
-
-trigger:
-  tags:
-    include:
-    - refs/tags/v*
-  branches:
-    exclude:
-    - master
-    
-pool:
-  vmImage: 'ubuntu-latest'
-
-variables:
-  GOBIN:  '$(GOPATH)/bin' # Go binaries path
-  GOROOT: '$(Agent.BuildDirectory)/go' # Go installation path
-  GOPATH: '$(Agent.BuildDirectory)/gopath' # Go workspace path
-  modulePath: '$(GOPATH)/src/github.com/$(build.repository.name)' # Path to the module's code
-
-steps:
-- script: |
-    mkdir -p '$(GOBIN)'
-    mkdir -p '$(GOPATH)/pkg'
-    mkdir -p '$(modulePath)'
-    shopt -s extglob
-    shopt -s dotglob
-    mv !(gopath) '$(modulePath)'
-    echo '##vso[task.prependpath]$(GOBIN)'
-    echo '##vso[task.prependpath]$(GOROOT)/bin'
-    wget "https://golang.org/dl/go1.15.2.linux-amd64.tar.gz" --output-document "$(Agent.BuildDirectory)/go1.15.2.tar.gz"
-    tar -C '$(Agent.BuildDirectory)' -xzf "$(Agent.BuildDirectory)/go1.15.2.tar.gz"
-  displayName: 'Set up the Go workspace'
-
-- script: |
-    go get github.com/mitchellh/gox
-
-    v="$(git describe --tags)"
-
-    output="{{.Dir}}-{{.OS}}-{{.Arch}}-$v"
-    osarch="!darwin/arm !darwin/arm64 !darwin/386"
-
-    echo "Compiling:"
-
-    os="windows linux darwin"
-    arch="amd64 386 arm arm64 mips mips64 mipsle mips64le"
-    pushd cmd/ck-client || exit 1
-    gox -ldflags "-X main.version=${v}" -os="$os" -arch="$arch" -osarch="$osarch" -output="$output"
-    GOOS="linux" GOARCH="mips" GOMIPS="softfloat" go build -ldflags "-X main.version=${v}" -o ck-client-linux-mips_softfloat-"${v}"
-    GOOS="linux" GOARCH="mipsle" GOMIPS="softfloat" go build -ldflags "-X main.version=${v}" -o ck-client-linux-mipsle_softfloat-"${v}"
-    mv ck-client-* $(Build.ArtifactStagingDirectory)/
-
-    os="linux"
-    arch="amd64 386 arm arm64"
-    pushd ../ck-server || exit 1
-    gox -ldflags "-X main.version=${v}" -os="$os" -arch="$arch" -osarch="$osarch" -output="$output"
-    mv ck-server-* $(Build.ArtifactStagingDirectory)/
-  workingDirectory: '$(modulePath)'
-  displayName: 'Get dependencies, then build'
-
-# GitHub Release
-# Create, edit, or delete a GitHub release
-- task: GitHubRelease@0
-  inputs:
-    gitHubConnection: github.com_cbeuw
-    repositoryName: '$(Build.Repository.Name)' 
-    action: 'create' # Options: create, edit, delete
-    target: '$(Build.SourceVersion)' # Required when action == Create || Action == Edit
-    tagSource: 'auto' # Required when action == Create# Options: auto, manual
-    #tagPattern: # Optional
-    #tag: "$(git describe --tags)" # Required when action == Edit || Action == Delete || TagSource == Manual
-    #title: # Optional
-    #releaseNotesSource: 'file' # Optional. Options: file, input
-    #releaseNotesFile: # Optional
-    #releaseNotes: # Optional
-    #assets: '$(Build.ArtifactStagingDirectory)/*' # Optional
-    #assetUploadMode: 'delete' # Optional. Options: delete, replace
-    #isDraft: false # Optional
-    #isPreRelease: false # Optional
-    addChangeLog: false # Optional
-    #compareWith: 'lastFullRelease' # Required when addChangeLog == True. Options: lastFullRelease, lastRelease, lastReleaseByTag
-    #releaseTag: # Required when compareWith == LastReleaseByTag

cmd/ck-client/ck-client.go

@@ -1,3 +1,4 @@
+//go:build go1.11
 // +build go1.11
 
 package main
@@ -7,10 +8,11 @@ import (
 	"encoding/binary"
 	"flag"
 	"fmt"
-	"github.com/cbeuw/Cloak/internal/common"
 	"net"
 	"os"
 
+	"github.com/cbeuw/Cloak/internal/common"
+
 	"github.com/cbeuw/Cloak/internal/client"
 	mux "github.com/cbeuw/Cloak/internal/multiplex"
 	log "github.com/sirupsen/logrus"
@@ -73,6 +75,9 @@ func main() {
 		log.Info("Starting standalone mode")
 	}
 
+	log.SetFormatter(&log.TextFormatter{
+		FullTimestamp: true,
+	})
 	lvl, err := log.ParseLevel(*verbosity)
 	if err != nil {
 		log.Fatal(err)
@@ -85,7 +90,9 @@ func main() {
 	}
 
 	if ssPluginMode {
-		rawConfig.ProxyMethod = "shadowsocks"
+		if rawConfig.ProxyMethod == "" {
+			rawConfig.ProxyMethod = "shadowsocks"
+		}
 		// json takes precedence over environment variables
 		// i.e. if json field isn't empty, use that
 		if rawConfig.RemoteHost == "" {
@@ -167,6 +174,12 @@ func main() {
 		}
 		log.Infof("Listening on %v %v for %v client", network, localConfig.LocalAddr, authInfo.ProxyMethod)
 		seshMaker = func() *mux.Session {
+			authInfo := authInfo // copy the struct because we are overwriting SessionId
+
+			randByte := make([]byte, 1)
+			common.RandRead(authInfo.WorldState.Rand, randByte)
+			authInfo.MockDomain = localConfig.MockDomainList[int(randByte[0])%len(localConfig.MockDomainList)]
+
 			// sessionID is usergenerated. There shouldn't be a security concern because the scope of
 			// sessionID is limited to its UID.
 			quad := make([]byte, 4)
@@ -182,12 +195,12 @@ func main() {
 			return net.ListenUDP("udp", udpAddr)
 		}
 
-		client.RouteUDP(acceptor, localConfig.Timeout, seshMaker)
+		client.RouteUDP(acceptor, localConfig.Timeout, remoteConfig.Singleplex, seshMaker)
 	} else {
 		listener, err := net.Listen("tcp", localConfig.LocalAddr)
 		if err != nil {
 			log.Fatal(err)
 		}
-		client.RouteTCP(listener, localConfig.Timeout, seshMaker)
+		client.RouteTCP(listener, localConfig.Timeout, remoteConfig.Singleplex, seshMaker)
 	}
 }

cmd/ck-client/log.go

@@ -1,3 +1,4 @@
+//go:build !android
 // +build !android
 
 package main

cmd/ck-client/log_android.go

@@ -2,6 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
+//go:build android
 // +build android
 
 package main
@@ -28,9 +29,10 @@ import "C"
 
 import (
 	"bufio"
-	log "github.com/sirupsen/logrus"
 	"os"
 	"unsafe"
+
+	log "github.com/sirupsen/logrus"
 )
 
 var (

cmd/ck-client/protector.go

@@ -1,3 +1,4 @@
+//go:build !android
 // +build !android
 
 package main

cmd/ck-client/protector_android.go

@@ -1,4 +1,6 @@
+//go:build android
 // +build android
+
 package main
 
 // Stolen from https://github.com/shadowsocks/overture/blob/shadowsocks/core/utils/utils_android.go
@@ -64,8 +66,9 @@ void set_timeout(int sock) {
 import "C"
 
 import (
-	log "github.com/sirupsen/logrus"
 	"syscall"
+
+	log "github.com/sirupsen/logrus"
 )
 
 // In Android, once an app starts the VpnService, all outgoing traffic are routed by the system

cmd/ck-server/ck-server.go

@@ -3,15 +3,16 @@ package main
 import (
 	"flag"
 	"fmt"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/cbeuw/Cloak/internal/server"
-	log "github.com/sirupsen/logrus"
 	"net"
 	"net/http"
 	_ "net/http/pprof"
 	"os"
 	"runtime"
 	"strings"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/cbeuw/Cloak/internal/server"
+	log "github.com/sirupsen/logrus"
 )
 
 var version string
@@ -72,6 +73,10 @@ func main() {
 
 	var pluginMode bool
 
+	log.SetFormatter(&log.TextFormatter{
+		FullTimestamp: true,
+	})
+
 	if os.Getenv("SS_LOCAL_HOST") != "" && os.Getenv("SS_LOCAL_PORT") != "" {
 		pluginMode = true
 		config = os.Getenv("SS_PLUGIN_OPTIONS")
@@ -80,8 +85,11 @@ func main() {
 		askVersion := flag.Bool("v", false, "Print the version number")
 		printUsage := flag.Bool("h", false, "Print this message")
 
-		genUID := flag.Bool("u", false, "Generate a UID")
+		genUIDScript := flag.Bool("u", false, "Generate a UID to STDOUT")
-		genKeyPair := flag.Bool("k", false, "Generate a pair of public and private key, output in the format of pubkey,pvkey")
+		genKeyPairScript := flag.Bool("k", false, "Generate a pair of public and private key and output to STDOUT in the format of <public key>,<private key>")
+
+		genUIDHuman := flag.Bool("uid", false, "Generate and print out a UID")
+		genKeyPairHuman := flag.Bool("key", false, "Generate and print out a public-private key pair")
 
 		pprofAddr := flag.String("d", "", "debug use: ip:port to be listened by pprof profiler")
 		verbosity := flag.String("verbosity", "info", "verbosity level")
@@ -96,13 +104,23 @@ func main() {
 			flag.Usage()
 			return
 		}
-		if *genUID {
+		if *genUIDScript || *genUIDHuman {
-			fmt.Println(generateUID())
+			uid := generateUID()
+			if *genUIDScript {
+				fmt.Println(uid)
+			} else {
+				fmt.Printf("\x1B[35mYour UID is:\u001B[0m %s\n", uid)
+			}
 			return
 		}
-		if *genKeyPair {
+		if *genKeyPairScript || *genKeyPairHuman {
 			pub, pv := generateKeyPair()
-			fmt.Printf("%v,%v", pub, pv)
+			if *genKeyPairScript {
+				fmt.Printf("%v,%v\n", pub, pv)
+			} else {
+				fmt.Printf("\x1B[36mYour PUBLIC key is:\x1B[0m %65s\n", pub)
+				fmt.Printf("\x1B[33mYour PRIVATE key is (keep it secret):\x1B[0m %47s\n", pv)
+			}
 			return
 		}
 

cmd/ck-server/ck-server_test.go

@@ -1,57 +1,36 @@
 package main
 
 import (
-	"github.com/stretchr/testify/assert"
 	"net"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestParseBindAddr(t *testing.T) {
 	t.Run("port only", func(t *testing.T) {
 		addrs, err := resolveBindAddr([]string{":443"})
-		if err != nil {
+		assert.NoError(t, err)
-			t.Error(err)
+		assert.Equal(t, ":443", addrs[0].String())
-			return
-		}
-		if addrs[0].String() != ":443" {
-			t.Errorf("expected %v got %v", ":443", addrs[0].String())
-		}
 	})
 
 	t.Run("specific address", func(t *testing.T) {
 		addrs, err := resolveBindAddr([]string{"192.168.1.123:443"})
-		if err != nil {
+		assert.NoError(t, err)
-			t.Error(err)
+		assert.Equal(t, "192.168.1.123:443", addrs[0].String())
-			return
-		}
-		if addrs[0].String() != "192.168.1.123:443" {
-			t.Errorf("expected %v got %v", "192.168.1.123:443", addrs[0].String())
-		}
 	})
 
 	t.Run("ipv6", func(t *testing.T) {
 		addrs, err := resolveBindAddr([]string{"[::]:443"})
-		if err != nil {
+		assert.NoError(t, err)
-			t.Error(err)
+		assert.Equal(t, "[::]:443", addrs[0].String())
-			return
-		}
-		if addrs[0].String() != "[::]:443" {
-			t.Errorf("expected %v got %v", "[::]:443", addrs[0].String())
-		}
 	})
 
 	t.Run("mixed", func(t *testing.T) {
 		addrs, err := resolveBindAddr([]string{":80", "[::]:443"})
-		if err != nil {
+		assert.NoError(t, err)
-			t.Error(err)
+		assert.Equal(t, ":80", addrs[0].String())
-			return
+		assert.Equal(t, "[::]:443", addrs[1].String())
-		}
-		if addrs[0].String() != ":80" {
-			t.Errorf("expected %v got %v", ":80", addrs[0].String())
-		}
-		if addrs[1].String() != "[::]:443" {
-			t.Errorf("expected %v got %v", "[::]:443", addrs[1].String())
-		}
 	})
 }
 

cmd/ck-server/keygen.go

@@ -3,6 +3,7 @@ package main
 import (
 	"crypto/rand"
 	"encoding/base64"
+
 	"github.com/cbeuw/Cloak/internal/common"
 	"github.com/cbeuw/Cloak/internal/ecdh"
 )

codecov.yaml

@@ -0,0 +1,4 @@
+coverage:
+  status:
+    project: off
+    patch: off

example_config/ckclient.json

@@ -2,8 +2,8 @@
   "Transport": "direct",
   "ProxyMethod": "shadowsocks",
   "EncryptionMethod": "plain",
-  "UID": "5nneblJy6lniPJfr81LuYQ==",
+  "UID": "---Your UID here---",
-  "PublicKey": "IYoUzkle/T/kriE+Ufdm7AHQtIeGnBWbhhlTbmDpUUI=",
+  "PublicKey": "---Public key here---",
   "ServerName": "www.bing.com",
   "NumConn": 4,
   "BrowserSig": "chrome",

example_config/ckserver.json

@@ -18,11 +18,10 @@
     ":80"
   ],
   "BypassUID": [
-    "1rmq6Ag1jZJCImLBIL5wzQ=="
+    "---Bypass UID here---"
   ],
-  "RedirAddr": "204.79.197.200:443",
+  "RedirAddr": "cloudflare.com",
-  "PrivateKey": "EN5aPEpNBO+vw+BtFQY2OnK9bQU7rvEj5qmnmgwEtUc=",
+  "PrivateKey": "---Private key here---",
-  "AdminUID": "5nneblJy6lniPJfr81LuYQ==",
+  "AdminUID": "---Admin UID here (optional)---",
-  "DatabasePath": "userinfo.db",
+  "DatabasePath": "userinfo.db"
-  "StreamTimeout": 300
 }

go.mod

@@ -1,24 +1,30 @@
 module github.com/cbeuw/Cloak
 
-go 1.14
+go 1.24.0
+
+toolchain go1.24.2
 
 require (
-	github.com/cbeuw/connutil v0.0.0-20200411160121-c5a5c4a9de14
+	github.com/cbeuw/connutil v0.0.0-20200411215123-966bfaa51ee3
-	github.com/dvyukov/go-fuzz v0.0.0-20201003075337-90825f39c90b // indirect
+	github.com/gorilla/mux v1.8.1
-	github.com/elazarl/go-bindata-assetfs v1.0.1 // indirect
+	github.com/gorilla/websocket v1.5.3
-	github.com/gorilla/mux v1.7.3
+	github.com/juju/ratelimit v1.0.2
-	github.com/gorilla/websocket v1.4.1
+	github.com/refraction-networking/utls v1.8.0
-	github.com/juju/ratelimit v1.0.1
+	github.com/sirupsen/logrus v1.9.3
-	github.com/konsorten/go-windows-terminal-sequences v1.0.2 // indirect
+	github.com/stretchr/testify v1.10.0
-	github.com/kr/pretty v0.1.0 // indirect
+	go.etcd.io/bbolt v1.4.0
-	github.com/mitchellh/gox v1.0.1 // indirect
+	golang.org/x/crypto v0.37.0
-	github.com/refraction-networking/utls v0.0.0-20190909200633-43c36d3c1f57
+)
-	github.com/sirupsen/logrus v1.5.0
+
-	github.com/stephens2424/writerset v1.0.2 // indirect
+require (
-	github.com/stretchr/testify v1.3.0
+	github.com/andybalholm/brotli v1.1.1 // indirect
-	go.etcd.io/bbolt v1.3.4
+	github.com/cloudflare/circl v1.6.1 // indirect
-	golang.org/x/crypto v0.0.0-20200622213623-75b288015ac9
+	github.com/davecgh/go-spew v1.1.1 // indirect
-	golang.org/x/sys v0.0.0-20200413165638-669c56c373c4 // indirect
+	github.com/klauspost/compress v1.18.0 // indirect
-	golang.org/x/tools v0.0.0-20201015182029-a5d9e455e9c4 // indirect
+	github.com/kr/pretty v0.3.1 // indirect
-	gopkg.in/check.v1 v1.0.0-20180628173108-788fd7840127 // indirect
+	github.com/pmezard/go-difflib v1.0.0 // indirect
+	github.com/rogpeppe/go-internal v1.14.1 // indirect
+	golang.org/x/sys v0.32.0 // indirect
+	gopkg.in/check.v1 v1.0.0-20201130134442-10cb98267c6c // indirect
+	gopkg.in/yaml.v3 v3.0.1 // indirect
 )

go.sum

@@ -1,80 +1,61 @@
-github.com/Julusian/godocdown v0.0.0-20170816220326-6d19f8ff2df8/go.mod h1:INZr5t32rG59/5xeltqoCJoNY7e5x/3xoY9WSWVWg74=
+github.com/andybalholm/brotli v1.1.1 h1:PR2pgnyFznKEugtsUo0xLdDop5SKXd5Qf5ysW+7XdTA=
-github.com/cbeuw/connutil v0.0.0-20200411160121-c5a5c4a9de14 h1:bWJKlzTJR7C9DX0l1qhkTaP1lTEBWVDKhg8C/tNJqKg=
+github.com/andybalholm/brotli v1.1.1/go.mod h1:05ib4cKhjx3OQYUY22hTVd34Bc8upXjOLL2rKwwZBoA=
-github.com/cbeuw/connutil v0.0.0-20200411160121-c5a5c4a9de14/go.mod h1:6jR2SzckGv8hIIS9zWJ160mzGVVOYp4AXZMDtacL6LE=
+github.com/cbeuw/connutil v0.0.0-20200411215123-966bfaa51ee3 h1:LRxW8pdmWmyhoNh+TxUjxsAinGtCsVGjsl3xg6zoRSs=
+github.com/cbeuw/connutil v0.0.0-20200411215123-966bfaa51ee3/go.mod h1:6jR2SzckGv8hIIS9zWJ160mzGVVOYp4AXZMDtacL6LE=
+github.com/cloudflare/circl v1.6.1 h1:zqIqSPIndyBh1bjLVVDHMPpVKqp8Su/V+6MeDzzQBQ0=
+github.com/cloudflare/circl v1.6.1/go.mod h1:uddAzsPgqdMAYatqJ0lsjX1oECcQLIlRpzZh3pJrofs=
+github.com/creack/pty v1.1.9/go.mod h1:oKZEueFk5CKHvIhNR5MUki03XCEU+Q6VDXinZuGJ33E=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/davecgh/go-spew v1.1.1 h1:vj9j/u1bqnvCEfJOwUhtlOARqs3+rkHYY13jYWTU97c=
 github.com/davecgh/go-spew v1.1.1/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
-github.com/dvyukov/go-fuzz v0.0.0-20201003075337-90825f39c90b h1:CXfDl9Y3NKuhOSxF9kXhiLmuYCdufQDrLY2fO1BzqBU=
+github.com/gorilla/mux v1.8.1 h1:TuBL49tXwgrFYWhqrNgrUNEY92u81SPhu7sTdzQEiWY=
-github.com/dvyukov/go-fuzz v0.0.0-20201003075337-90825f39c90b/go.mod h1:11Gm+ccJnvAhCNLlf5+cS9KjtbaD5I5zaZpFMsTHWTw=
+github.com/gorilla/mux v1.8.1/go.mod h1:AKf9I4AEqPTmMytcMc0KkNouC66V3BtZ4qD5fmWSiMQ=
-github.com/elazarl/go-bindata-assetfs v1.0.1 h1:m0kkaHRKEu7tUIUFVwhGGGYClXvyl4RE03qmvRTNfbw=
+github.com/gorilla/websocket v1.5.3 h1:saDtZ6Pbx/0u+bgYQ3q96pZgCzfhKXGPqt7kZ72aNNg=
-github.com/elazarl/go-bindata-assetfs v1.0.1/go.mod h1:v+YaWX3bdea5J/mo8dSETolEo7R71Vk1u8bnjau5yw4=
+github.com/gorilla/websocket v1.5.3/go.mod h1:YR8l580nyteQvAITg2hZ9XVh4b55+EU/adAjf1fMHhE=
-github.com/gorilla/mux v1.7.3 h1:gnP5JzjVOuiZD07fKKToCAOjS0yOpj/qPETTXCCS6hw=
+github.com/juju/ratelimit v1.0.2 h1:sRxmtRiajbvrcLQT7S+JbqU0ntsb9W2yhSdNN8tWfaI=
-github.com/gorilla/mux v1.7.3/go.mod h1:1lud6UwP+6orDFRuTfBEV8e9/aOM/c4fVVCaMa2zaAs=
+github.com/juju/ratelimit v1.0.2/go.mod h1:qapgC/Gy+xNh9UxzV13HGGl/6UXNN+ct+vwSgWNm/qk=
-github.com/gorilla/websocket v1.4.1 h1:q7AeDBpnBk8AogcD4DSag/Ukw/KV+YhzLj2bP5HvKCM=
+github.com/klauspost/compress v1.18.0 h1:c/Cqfb0r+Yi+JtIEq73FWXVkRonBlf0CRNYc8Zttxdo=
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internal/client/TLS.go

@@ -1,10 +1,11 @@
 package client
 
 import (
-	"encoding/binary"
 	"github.com/cbeuw/Cloak/internal/common"
+	utls "github.com/refraction-networking/utls"
 	log "github.com/sirupsen/logrus"
 	"net"
+	"strings"
 )
 
 const appDataMaxLength = 16401
@@ -13,59 +14,125 @@ type clientHelloFields struct {
 	random         []byte
 	sessionId      []byte
 	x25519KeyShare []byte
-	sni            []byte
+	serverName     string
 }
 
-type browser interface {
+type browser int
-	composeClientHello(clientHelloFields) []byte
-}
 
-func makeServerName(serverName string) []byte {
+const (
-	serverNameListLength := make([]byte, 2)
+	chrome = iota
-	binary.BigEndian.PutUint16(serverNameListLength, uint16(len(serverName)+3))
+	firefox
-	serverNameType := []byte{0x00} // host_name
+	safari
-	serverNameLength := make([]byte, 2)
+)
-	binary.BigEndian.PutUint16(serverNameLength, uint16(len(serverName)))
-	ret := make([]byte, 2+1+2+len(serverName))
-	copy(ret[0:2], serverNameListLength)
-	copy(ret[2:3], serverNameType)
-	copy(ret[3:5], serverNameLength)
-	copy(ret[5:], serverName)
-	return ret
-}
-
-// addExtensionRecord, add type, length to extension data
-func addExtRec(typ []byte, data []byte) []byte {
-	length := make([]byte, 2)
-	binary.BigEndian.PutUint16(length, uint16(len(data)))
-	ret := make([]byte, 2+2+len(data))
-	copy(ret[0:2], typ)
-	copy(ret[2:4], length)
-	copy(ret[4:], data)
-	return ret
-}
-
-func genStegClientHello(ai authenticationPayload, serverName string) (ret clientHelloFields) {
-	// random is marshalled ephemeral pub key 32 bytes
-	// The authentication ciphertext and its tag are then distributed among SessionId and X25519KeyShare
-	ret.random = ai.randPubKey[:]
-	ret.sessionId = ai.ciphertextWithTag[0:32]
-	ret.x25519KeyShare = ai.ciphertextWithTag[32:64]
-	ret.sni = makeServerName(serverName)
-	return
-}
 
 type DirectTLS struct {
 	*common.TLSConn
 	browser browser
 }
 
-// NewClientTransport handles the TLS handshake for a given conn and returns the sessionKey
+var topLevelDomains = []string{"com", "net", "org", "it", "fr", "me", "ru", "cn", "es", "tr", "top", "xyz", "info"}
+
+func randomServerName() string {
+	/*
+		Copyright: Proton AG
+		https://github.com/ProtonVPN/wireguard-go/commit/bcf344b39b213c1f32147851af0d2a8da9266883
+
+		Permission is hereby granted, free of charge, to any person obtaining a copy of
+		this software and associated documentation files (the "Software"), to deal in
+		the Software without restriction, including without limitation the rights to
+		use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+		of the Software, and to permit persons to whom the Software is furnished to do
+		so, subject to the following conditions:
+
+		The above copyright notice and this permission notice shall be included in all
+		copies or substantial portions of the Software.
+
+		THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+		IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+		FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+		AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+		LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+		OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+		SOFTWARE.
+	*/
+	charNum := int('z') - int('a') + 1
+	size := 3 + common.RandInt(10)
+	name := make([]byte, size)
+	for i := range name {
+		name[i] = byte(int('a') + common.RandInt(charNum))
+	}
+	return string(name) + "." + common.RandItem(topLevelDomains)
+}
+
+func buildClientHello(browser browser, fields clientHelloFields) ([]byte, error) {
+	// We don't use utls to handle connections (as it'll attempt a real TLS negotiation)
+	// We only want it to build the ClientHello locally
+	fakeConn := net.TCPConn{}
+	var helloID utls.ClientHelloID
+	switch browser {
+	case chrome:
+		helloID = utls.HelloChrome_Auto
+	case firefox:
+		helloID = utls.HelloFirefox_Auto
+	case safari:
+		helloID = utls.HelloSafari_Auto
+	}
+
+	uclient := utls.UClient(&fakeConn, &utls.Config{ServerName: fields.serverName}, helloID)
+	if err := uclient.BuildHandshakeState(); err != nil {
+		return []byte{}, err
+	}
+	if err := uclient.SetClientRandom(fields.random); err != nil {
+		return []byte{}, err
+	}
+
+	uclient.HandshakeState.Hello.SessionId = make([]byte, 32)
+	copy(uclient.HandshakeState.Hello.SessionId, fields.sessionId)
+
+	// Find the X25519 key share and overwrite it
+	var extIndex int
+	var keyShareIndex int
+	for i, ext := range uclient.Extensions {
+		ext, ok := ext.(*utls.KeyShareExtension)
+		if ok {
+			extIndex = i
+			for j, keyShare := range ext.KeyShares {
+				if keyShare.Group == utls.X25519 {
+					keyShareIndex = j
+				}
+			}
+		}
+	}
+	copy(uclient.Extensions[extIndex].(*utls.KeyShareExtension).KeyShares[keyShareIndex].Data, fields.x25519KeyShare)
+
+	if err := uclient.BuildHandshakeState(); err != nil {
+		return []byte{}, err
+	}
+	return uclient.HandshakeState.Hello.Raw, nil
+}
+
+// Handshake handles the TLS handshake for a given conn and returns the sessionKey
 // if the server proceed with Cloak authentication
 func (tls *DirectTLS) Handshake(rawConn net.Conn, authInfo AuthInfo) (sessionKey [32]byte, err error) {
 	payload, sharedSecret := makeAuthenticationPayload(authInfo)
-	chOnly := tls.browser.composeClientHello(genStegClientHello(payload, authInfo.MockDomain))
+
-	chWithRecordLayer := common.AddRecordLayer(chOnly, common.Handshake, common.VersionTLS11)
+	fields := clientHelloFields{
+		random:         payload.randPubKey[:],
+		sessionId:      payload.ciphertextWithTag[0:32],
+		x25519KeyShare: payload.ciphertextWithTag[32:64],
+		serverName:     authInfo.MockDomain,
+	}
+
+	if strings.EqualFold(fields.serverName, "random") {
+		fields.serverName = randomServerName()
+	}
+
+	var ch []byte
+	ch, err = buildClientHello(tls.browser, fields)
+	if err != nil {
+		return
+	}
+	chWithRecordLayer := common.AddRecordLayer(ch, common.Handshake, common.VersionTLS11)
 	_, err = rawConn.Write(chWithRecordLayer)
 	if err != nil {
 		return

internal/client/TLS_test.go

@@ -1,43 +0,0 @@
-package client
-
-import (
-	"bytes"
-	"encoding/hex"
-	"testing"
-)
-
-func htob(s string) []byte {
-	b, _ := hex.DecodeString(s)
-	return b
-}
-
-func TestMakeServerName(t *testing.T) {
-	type testingPair struct {
-		serverName string
-		target     []byte
-	}
-
-	pairs := []testingPair{
-		{
-			"www.google.com",
-			htob("001100000e7777772e676f6f676c652e636f6d"),
-		},
-		{
-			"www.gstatic.com",
-			htob("001200000f7777772e677374617469632e636f6d"),
-		},
-		{
-			"googleads.g.doubleclick.net",
-			htob("001e00001b676f6f676c656164732e672e646f75626c65636c69636b2e6e6574"),
-		},
-	}
-
-	for _, p := range pairs {
-		if !bytes.Equal(makeServerName(p.serverName), p.target) {
-			t.Error(
-				"for", p.serverName,
-				"expecting", p.target,
-				"got", makeServerName(p.serverName))
-		}
-	}
-}

internal/client/auth.go

@@ -2,8 +2,10 @@ package client
 
 import (
 	"encoding/binary"
+
 	"github.com/cbeuw/Cloak/internal/common"
 	"github.com/cbeuw/Cloak/internal/ecdh"
+	log "github.com/sirupsen/logrus"
 )
 
 const (
@@ -26,21 +28,28 @@ func makeAuthenticationPayload(authInfo AuthInfo) (ret authenticationPayload, sh
 		| 16 bytes | 12 bytes       | 1 byte              | 8 bytes     | 4 bytes      | 1 byte | 6 bytes    |
 		+----------+----------------+---------------------+-------------+--------------+--------+------------+
 	*/
-	ephPv, ephPub, _ := ecdh.GenerateKey(authInfo.WorldState.Rand)
+	ephPv, ephPub, err := ecdh.GenerateKey(authInfo.WorldState.Rand)
+	if err != nil {
+		log.Panicf("failed to generate ephemeral key pair: %v", err)
+	}
 	copy(ret.randPubKey[:], ecdh.Marshal(ephPub))
 
 	plaintext := make([]byte, 48)
 	copy(plaintext, authInfo.UID)
 	copy(plaintext[16:28], authInfo.ProxyMethod)
 	plaintext[28] = authInfo.EncryptionMethod
-	binary.BigEndian.PutUint64(plaintext[29:37], uint64(authInfo.WorldState.Now().Unix()))
+	binary.BigEndian.PutUint64(plaintext[29:37], uint64(authInfo.WorldState.Now().UTC().Unix()))
 	binary.BigEndian.PutUint32(plaintext[37:41], authInfo.SessionId)
 
 	if authInfo.Unordered {
 		plaintext[41] |= UNORDERED_FLAG
 	}
 
-	copy(sharedSecret[:], ecdh.GenerateSharedSecret(ephPv, authInfo.ServerPubKey))
+	secret, err := ecdh.GenerateSharedSecret(ephPv, authInfo.ServerPubKey)
+	if err != nil {
+		log.Panicf("error in generating shared secret: %v", err)
+	}
+	copy(sharedSecret[:], secret)
 	ciphertextWithTag, _ := common.AESGCMEncrypt(ret.randPubKey[:12], sharedSecret[:], plaintext)
 	copy(ret.ciphertextWithTag[:], ciphertextWithTag[:])
 	return

internal/client/auth_test.go

@@ -2,10 +2,12 @@ package client
 
 import (
 	"bytes"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/cbeuw/Cloak/internal/multiplex"
 	"testing"
 	"time"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/cbeuw/Cloak/internal/multiplex"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestMakeAuthenticationPayload(t *testing.T) {
@@ -27,7 +29,7 @@ func TestMakeAuthenticationPayload(t *testing.T) {
 					0x01, 0xd0, 0xb4, 0x87, 0x86, 0x9c, 0x15, 0x9b,
 					0x86, 0x19, 0x53, 0x6e, 0x60, 0xe9, 0x51, 0x42},
 				ProxyMethod:      "shadowsocks",
-				EncryptionMethod: multiplex.E_METHOD_PLAIN,
+				EncryptionMethod: multiplex.EncryptionMethodPlain,
 				MockDomain:       "d2jkinvisak5y9.cloudfront.net",
 				WorldState: common.WorldState{
 					Rand: bytes.NewBuffer([]byte{
@@ -64,12 +66,8 @@ func TestMakeAuthenticationPayload(t *testing.T) {
 	for _, tc := range tests {
 		func() {
 			payload, sharedSecret := makeAuthenticationPayload(tc.authInfo)
-			if payload != tc.expPayload {
+			assert.Equal(t, tc.expPayload, payload, "payload doesn't match")
-				t.Errorf("payload doesn't match:\nexp %v\ngot %v", tc.expPayload, payload)
+			assert.Equal(t, tc.expSecret, sharedSecret, "shared secret doesn't match")
-			}
-			if sharedSecret != tc.expSecret {
-				t.Errorf("secret doesn't match:\nexp %x\ngot %x", tc.expPayload, payload)
-			}
 		}()
 	}
 }

internal/client/chrome.go

@@ -1,103 +0,0 @@
-// Fingerprint of Chrome 85
-
-package client
-
-import (
-	"encoding/binary"
-	"encoding/hex"
-	"github.com/cbeuw/Cloak/internal/common"
-)
-
-type Chrome struct{}
-
-func makeGREASE() []byte {
-	// see https://tools.ietf.org/html/draft-davidben-tls-grease-01
-	// This is exclusive to Chrome.
-	var one [1]byte
-	common.CryptoRandRead(one[:])
-	sixteenth := one[0] % 16
-	monoGREASE := sixteenth*16 + 0xA
-	doubleGREASE := []byte{monoGREASE, monoGREASE}
-	return doubleGREASE
-}
-
-func (c *Chrome) composeExtensions(sni []byte, keyShare []byte) []byte {
-
-	makeSupportedGroups := func() []byte {
-		suppGroupListLen := []byte{0x00, 0x08}
-		ret := make([]byte, 2+8)
-		copy(ret[0:2], suppGroupListLen)
-		copy(ret[2:4], makeGREASE())
-		copy(ret[4:], []byte{0x00, 0x1d, 0x00, 0x17, 0x00, 0x18})
-		return ret
-	}
-
-	makeKeyShare := func(hidden []byte) []byte {
-		ret := make([]byte, 43)
-		ret[0], ret[1] = 0x00, 0x29 // length 41
-		copy(ret[2:4], makeGREASE())
-		ret[4], ret[5] = 0x00, 0x01 // length 1
-		ret[6] = 0x00
-		ret[7], ret[8] = 0x00, 0x1d  // group x25519
-		ret[9], ret[10] = 0x00, 0x20 // length 32
-		copy(ret[11:43], hidden)
-		return ret
-	}
-
-	// extension length is always 403, and server name length is variable
-
-	var ext [17][]byte
-	ext[0] = addExtRec(makeGREASE(), nil)                         // First GREASE
-	ext[1] = addExtRec([]byte{0x00, 0x00}, sni)                   // server name indication
-	ext[2] = addExtRec([]byte{0x00, 0x17}, nil)                   // extended_master_secret
-	ext[3] = addExtRec([]byte{0xff, 0x01}, []byte{0x00})          // renegotiation_info
-	ext[4] = addExtRec([]byte{0x00, 0x0a}, makeSupportedGroups()) // supported groups
-	ext[5] = addExtRec([]byte{0x00, 0x0b}, []byte{0x01, 0x00})    // ec point formats
-	ext[6] = addExtRec([]byte{0x00, 0x23}, nil)                   // Session tickets
-	APLN, _ := hex.DecodeString("000c02683208687474702f312e31")
-	ext[7] = addExtRec([]byte{0x00, 0x10}, APLN)                                 // app layer proto negotiation
-	ext[8] = addExtRec([]byte{0x00, 0x05}, []byte{0x01, 0x00, 0x00, 0x00, 0x00}) // status request
-	sigAlgo, _ := hex.DecodeString("001004030804040105030805050108060601")
-	ext[9] = addExtRec([]byte{0x00, 0x0d}, sigAlgo)                 // Signature Algorithms
-	ext[10] = addExtRec([]byte{0x00, 0x12}, nil)                    // signed cert timestamp
-	ext[11] = addExtRec([]byte{0x00, 0x33}, makeKeyShare(keyShare)) // key share
-	ext[12] = addExtRec([]byte{0x00, 0x2d}, []byte{0x01, 0x01})     // psk key exchange modes
-	suppVersions, _ := hex.DecodeString("0a9A9A0304030303020301")   // 9A9A needs to be a GREASE
-	copy(suppVersions[1:3], makeGREASE())
-	ext[13] = addExtRec([]byte{0x00, 0x2b}, suppVersions)             // supported versions
-	ext[14] = addExtRec([]byte{0x00, 0x1b}, []byte{0x02, 0x00, 0x02}) // compress certificate
-	ext[15] = addExtRec(makeGREASE(), []byte{0x00})                   // Last GREASE
-	// len(ext[1]) + 170 + len(ext[16]) = 403
-	// len(ext[16]) = 233 - len(ext[1])
-	// 2+2+len(padding) = 233 - len(ext[1])
-	// len(padding) = 229 - len(ext[1])
-	ext[16] = addExtRec([]byte{0x00, 0x15}, make([]byte, 229-len(ext[1]))) // padding
-	var ret []byte
-	for _, e := range ext {
-		ret = append(ret, e...)
-	}
-	return ret
-}
-
-func (c *Chrome) composeClientHello(hd clientHelloFields) (ch []byte) {
-	var clientHello [12][]byte
-	clientHello[0] = []byte{0x01}             // handshake type
-	clientHello[1] = []byte{0x00, 0x01, 0xfc} // length 508
-	clientHello[2] = []byte{0x03, 0x03}       // client version
-	clientHello[3] = hd.random                // random
-	clientHello[4] = []byte{0x20}             // session id length 32
-	clientHello[5] = hd.sessionId             // session id
-	clientHello[6] = []byte{0x00, 0x20}       // cipher suites length 34
-	cipherSuites, _ := hex.DecodeString("130113021303c02bc02fc02cc030cca9cca8c013c014009c009d002f0035")
-	clientHello[7] = append(makeGREASE(), cipherSuites...) // cipher suites
-	clientHello[8] = []byte{0x01}                          // compression methods length 1
-	clientHello[9] = []byte{0x00}                          // compression methods
-	clientHello[11] = c.composeExtensions(hd.sni, hd.x25519KeyShare)
-	clientHello[10] = []byte{0x00, 0x00} // extensions length 403
-	binary.BigEndian.PutUint16(clientHello[10], uint16(len(clientHello[11])))
-	var ret []byte
-	for _, c := range clientHello {
-		ret = append(ret, c...)
-	}
-	return ret
-}

internal/client/chrome_test.go

@@ -1,48 +0,0 @@
-package client
-
-import (
-	"encoding/hex"
-	"testing"
-)
-
-func TestMakeGREASE(t *testing.T) {
-	a := hex.EncodeToString(makeGREASE())
-	if a[1] != 'a' || a[3] != 'a' {
-		t.Errorf("GREASE got %v", a)
-	}
-
-	var GREASEs []string
-	for i := 0; i < 50; i++ {
-		GREASEs = append(GREASEs, hex.EncodeToString(makeGREASE()))
-	}
-	var eqCount int
-	for _, g := range GREASEs {
-		if a == g {
-			eqCount++
-		}
-	}
-	if eqCount > 40 {
-		t.Error("GREASE is not random", GREASEs)
-	}
-}
-
-func TestComposeExtension(t *testing.T) {
-	serverName := "github.com"
-	keyShare, _ := hex.DecodeString("690f074f5c01756982269b66d58c90c47dc0f281d654c7b2c16f63c9033f5604")
-
-	sni := makeServerName(serverName)
-
-	result := (&Chrome{}).composeExtensions(sni, keyShare)
-	target, _ := hex.DecodeString("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")
-	for p := 0; p < len(result); p++ {
-		if result[p] != target[p] {
-			if result[p]&0x0F == 0xA && target[p]&0x0F == 0xA &&
-				((p > 0 && result[p-1] == result[p] && target[p-1] == target[p]) ||
-					(p < len(result)-1 && result[p+1] == result[p] && target[p+1] == target[p])) {
-				continue
-			}
-			t.Errorf("inequality at %v", p)
-		}
-	}
-
-}

internal/client/connector.go

@@ -1,12 +1,13 @@
 package client
 
 import (
-	"github.com/cbeuw/Cloak/internal/common"
 	"net"
 	"sync"
 	"sync/atomic"
 	"time"
 
+	"github.com/cbeuw/Cloak/internal/common"
+
 	mux "github.com/cbeuw/Cloak/internal/multiplex"
 	log "github.com/sirupsen/logrus"
 )
@@ -20,8 +21,10 @@ func MakeSession(connConfig RemoteConnConfig, authInfo AuthInfo, dialer common.D
 	var wg sync.WaitGroup
 	for i := 0; i < connConfig.NumConn; i++ {
 		wg.Add(1)
+		transportConfig := connConfig.Transport
 		go func() {
 		makeconn:
+			transportConn := transportConfig.CreateTransport()
 			remoteConn, err := dialer.Dial("tcp", connConfig.RemoteAddr)
 			if err != nil {
 				log.Errorf("Failed to establish new connections to remote: %v", err)
@@ -30,12 +33,20 @@ func MakeSession(connConfig RemoteConnConfig, authInfo AuthInfo, dialer common.D
 				goto makeconn
 			}
 
-			transportConn := connConfig.TransportMaker()
 			sk, err := transportConn.Handshake(remoteConn, authInfo)
 			if err != nil {
-				transportConn.Close()
 				log.Errorf("Failed to prepare connection to remote: %v", err)
+				transportConn.Close()
+
+				// In Cloak v2.11.0, we've updated uTLS version and subsequently increased the first packet size for chrome above 1500
+				// https://github.com/cbeuw/Cloak/pull/306#issuecomment-2862728738. As a backwards compatibility feature, if we fail
+				// to connect using chrome signature, retry with firefox which has a smaller packet size.
+				if transportConfig.mode == "direct" && transportConfig.browser == chrome {
+					transportConfig.browser = firefox
+					log.Warnf("failed to connect with chrome signature, falling back to retry with firefox")
+				}
 				time.Sleep(time.Second * 3)
+
 				goto makeconn
 			}
 			// sessionKey given by each connection should be identical

internal/client/firefox.go

@@ -1,77 +0,0 @@
-// Fingerprint of Firefox 68
-
-package client
-
-import (
-	"encoding/binary"
-	"encoding/hex"
-	"github.com/cbeuw/Cloak/internal/common"
-)
-
-type Firefox struct{}
-
-func (f *Firefox) composeExtensions(SNI []byte, keyShare []byte) []byte {
-	composeKeyShare := func(hidden []byte) []byte {
-		ret := make([]byte, 107)
-		ret[0], ret[1] = 0x00, 0x69 // length 105
-		ret[2], ret[3] = 0x00, 0x1d // group x25519
-		ret[4], ret[5] = 0x00, 0x20 // length 32
-		copy(ret[6:38], hidden)
-		ret[38], ret[39] = 0x00, 0x17 // group secp256r1
-		ret[40], ret[41] = 0x00, 0x41 // length 65
-		common.CryptoRandRead(ret[42:107])
-		return ret
-	}
-	// extension length is always 399, and server name length is variable
-	var ext [14][]byte
-	ext[0] = addExtRec([]byte{0x00, 0x00}, SNI)          // server name indication
-	ext[1] = addExtRec([]byte{0x00, 0x17}, nil)          // extended_master_secret
-	ext[2] = addExtRec([]byte{0xff, 0x01}, []byte{0x00}) // renegotiation_info
-	suppGroup, _ := hex.DecodeString("000c001d00170018001901000101")
-	ext[3] = addExtRec([]byte{0x00, 0x0a}, suppGroup)          // supported groups
-	ext[4] = addExtRec([]byte{0x00, 0x0b}, []byte{0x01, 0x00}) // ec point formats
-	ext[5] = addExtRec([]byte{0x00, 0x23}, []byte{})           // Session tickets
-	APLN, _ := hex.DecodeString("000c02683208687474702f312e31")
-	ext[6] = addExtRec([]byte{0x00, 0x10}, APLN)                                 // app layer proto negotiation
-	ext[7] = addExtRec([]byte{0x00, 0x05}, []byte{0x01, 0x00, 0x00, 0x00, 0x00}) // status request
-	ext[8] = addExtRec([]byte{0x00, 0x33}, composeKeyShare(keyShare))            // key share
-	suppVersions, _ := hex.DecodeString("080304030303020301")
-	ext[9] = addExtRec([]byte{0x00, 0x2b}, suppVersions) // supported versions
-	sigAlgo, _ := hex.DecodeString("001604030503060308040805080604010501060102030201")
-	ext[10] = addExtRec([]byte{0x00, 0x0d}, sigAlgo)            // Signature Algorithms
-	ext[11] = addExtRec([]byte{0x00, 0x2d}, []byte{0x01, 0x01}) // psk key exchange modes
-	ext[12] = addExtRec([]byte{0x00, 0x1c}, []byte{0x40, 0x01}) // record size limit
-	// len(ext[0]) + 237 + 4 + len(padding) = 399
-	// len(padding) = 158 - len(ext[0])
-	ext[13] = addExtRec([]byte{0x00, 0x15}, make([]byte, 163-len(SNI))) // padding
-	var ret []byte
-	for _, e := range ext {
-		ret = append(ret, e...)
-	}
-	return ret
-}
-
-func (f *Firefox) composeClientHello(hd clientHelloFields) (ch []byte) {
-	var clientHello [12][]byte
-	clientHello[0] = []byte{0x01}             // handshake type
-	clientHello[1] = []byte{0x00, 0x01, 0xfc} // length 508
-	clientHello[2] = []byte{0x03, 0x03}       // client version
-	clientHello[3] = hd.random                // random
-	clientHello[4] = []byte{0x20}             // session id length 32
-	clientHello[5] = hd.sessionId             // session id
-	clientHello[6] = []byte{0x00, 0x24}       // cipher suites length 36
-	cipherSuites, _ := hex.DecodeString("130113031302c02bc02fcca9cca8c02cc030c00ac009c013c01400330039002f0035000a")
-	clientHello[7] = cipherSuites // cipher suites
-	clientHello[8] = []byte{0x01} // compression methods length 1
-	clientHello[9] = []byte{0x00} // compression methods
-
-	clientHello[11] = f.composeExtensions(hd.sni, hd.x25519KeyShare)
-	clientHello[10] = []byte{0x00, 0x00} // extensions length
-	binary.BigEndian.PutUint16(clientHello[10], uint16(len(clientHello[11])))
-
-	var ret []byte
-	for _, c := range clientHello {
-		ret = append(ret, c...)
-	}
-	return ret
-}

internal/client/firefox_test.go

@@ -1,20 +0,0 @@
-package client
-
-import (
-	"bytes"
-	"encoding/hex"
-	"testing"
-)
-
-func TestComposeExtensions(t *testing.T) {
-	target, _ := hex.DecodeString("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")
-
-	serverName := "consent.google.com"
-	keyShare, _ := hex.DecodeString("6075db0a43812b2e4e0f44157f04295b484ccfc6d70e577c1e6113aa18e08827")
-	sni := makeServerName(serverName)
-	result := (&Firefox{}).composeExtensions(sni, keyShare)
-	// skip random secp256r1
-	if !bytes.Equal(result[:137], target[:137]) || !bytes.Equal(result[202:], target[202:]) {
-		t.Errorf("got %x", result)
-	}
-}

internal/client/piper.go

@@ -1,16 +1,18 @@
 package client
 
 import (
-	"github.com/cbeuw/Cloak/internal/common"
 	"io"
 	"net"
+	"sync"
 	"time"
 
+	"github.com/cbeuw/Cloak/internal/common"
+
 	mux "github.com/cbeuw/Cloak/internal/multiplex"
 	log "github.com/sirupsen/logrus"
 )
 
-func RouteUDP(bindFunc func() (*net.UDPConn, error), streamTimeout time.Duration, newSeshFunc func() *mux.Session) {
+func RouteUDP(bindFunc func() (*net.UDPConn, error), streamTimeout time.Duration, singleplex bool, newSeshFunc func() *mux.Session) {
 	var sesh *mux.Session
 	localConn, err := bindFunc()
 	if err != nil {
@@ -18,6 +20,7 @@ func RouteUDP(bindFunc func() (*net.UDPConn, error), streamTimeout time.Duration
 	}
 
 	streams := make(map[string]*mux.Stream)
+	var streamsMutex sync.Mutex
 
 	data := make([]byte, 8192)
 	for {
@@ -27,22 +30,31 @@ func RouteUDP(bindFunc func() (*net.UDPConn, error), streamTimeout time.Duration
 			continue
 		}
 
-		if sesh == nil || sesh.IsClosed() || sesh.Singleplex {
+		if !singleplex && (sesh == nil || sesh.IsClosed()) {
 			sesh = newSeshFunc()
 		}
 
+		streamsMutex.Lock()
 		stream, ok := streams[addr.String()]
 		if !ok {
-			stream, err = sesh.OpenStream()
+			if singleplex {
-			if err != nil {
+				sesh = newSeshFunc()
-				log.Errorf("Failed to open stream: %v", err)
-				if sesh.Singleplex {
-					sesh.Close()
-				}
-				continue
 			}
 
+			stream, err = sesh.OpenStream()
+			if err != nil {
+				if singleplex {
+					sesh.Close()
+				}
+				log.Errorf("Failed to open stream: %v", err)
+				streamsMutex.Unlock()
+				continue
+			}
 			streams[addr.String()] = stream
+			streamsMutex.Unlock()
+
+			_ = stream.SetReadDeadline(time.Now().Add(streamTimeout))
+
 			proxyAddr := addr
 			go func(stream *mux.Stream, localConn *net.UDPConn) {
 				buf := make([]byte, 8192)
@@ -50,31 +62,40 @@ func RouteUDP(bindFunc func() (*net.UDPConn, error), streamTimeout time.Duration
 					n, err := stream.Read(buf)
 					if err != nil {
 						log.Tracef("copying stream to proxy client: %v", err)
-						stream.Close()
+						break
-						return
 					}
+					_ = stream.SetReadDeadline(time.Now().Add(streamTimeout))
 
 					_, err = localConn.WriteTo(buf[:n], proxyAddr)
 					if err != nil {
 						log.Tracef("copying stream to proxy client: %v", err)
-						stream.Close()
+						break
-						return
 					}
 				}
+				streamsMutex.Lock()
+				delete(streams, addr.String())
+				streamsMutex.Unlock()
+				stream.Close()
+				return
 			}(stream, localConn)
+		} else {
+			streamsMutex.Unlock()
 		}
 
 		_, err = stream.Write(data[:i])
 		if err != nil {
 			log.Tracef("copying proxy client to stream: %v", err)
+			streamsMutex.Lock()
 			delete(streams, addr.String())
+			streamsMutex.Unlock()
 			stream.Close()
 			continue
 		}
+		_ = stream.SetReadDeadline(time.Now().Add(streamTimeout))
 	}
 }
 
-func RouteTCP(listener net.Listener, streamTimeout time.Duration, newSeshFunc func() *mux.Session) {
+func RouteTCP(listener net.Listener, streamTimeout time.Duration, singleplex bool, newSeshFunc func() *mux.Session) {
 	var sesh *mux.Session
 	for {
 		localConn, err := listener.Accept()
@@ -82,23 +103,30 @@ func RouteTCP(listener net.Listener, streamTimeout time.Duration, newSeshFunc fu
 			log.Fatal(err)
 			continue
 		}
-		if sesh == nil || sesh.IsClosed() || sesh.Singleplex {
+		if !singleplex && (sesh == nil || sesh.IsClosed()) {
 			sesh = newSeshFunc()
 		}
-		go func(sesh *mux.Session, localConn net.Conn) {
+		go func(sesh *mux.Session, localConn net.Conn, timeout time.Duration) {
+			if singleplex {
+				sesh = newSeshFunc()
+			}
+
 			data := make([]byte, 10240)
+			_ = localConn.SetReadDeadline(time.Now().Add(streamTimeout))
 			i, err := io.ReadAtLeast(localConn, data, 1)
 			if err != nil {
 				log.Errorf("Failed to read first packet from proxy client: %v", err)
 				localConn.Close()
 				return
 			}
+			var zeroTime time.Time
+			_ = localConn.SetReadDeadline(zeroTime)
 
 			stream, err := sesh.OpenStream()
 			if err != nil {
 				log.Errorf("Failed to open stream: %v", err)
 				localConn.Close()
-				if sesh.Singleplex {
+				if singleplex {
 					sesh.Close()
 				}
 				return
@@ -112,7 +140,6 @@ func RouteTCP(listener net.Listener, streamTimeout time.Duration, newSeshFunc fu
 				return
 			}
 
-			stream.SetReadFromTimeout(streamTimeout) // if localConn hasn't sent anything to stream to a period of time, stream closes
 			go func() {
 				if _, err := common.Copy(localConn, stream); err != nil {
 					log.Tracef("copying stream to proxy client: %v", err)
@@ -121,7 +148,6 @@ func RouteTCP(listener net.Listener, streamTimeout time.Duration, newSeshFunc fu
 			if _, err = common.Copy(stream, localConn); err != nil {
 				log.Tracef("copying proxy client to stream: %v", err)
 			}
-		}(sesh, localConn)
+		}(sesh, localConn, streamTimeout)
 	}
-
 }

internal/client/state.go

@@ -4,13 +4,14 @@ import (
 	"crypto"
 	"encoding/json"
 	"fmt"
-	"github.com/cbeuw/Cloak/internal/common"
-	log "github.com/sirupsen/logrus"
 	"io/ioutil"
 	"net"
 	"strings"
 	"time"
 
+	"github.com/cbeuw/Cloak/internal/common"
+	log "github.com/sirupsen/logrus"
+
 	"github.com/cbeuw/Cloak/internal/ecdh"
 	mux "github.com/cbeuw/Cloak/internal/multiplex"
 )
@@ -26,30 +27,33 @@ type RawConfig struct {
 	UID              []byte
 	PublicKey        []byte
 	NumConn          int
-	LocalHost        string // jsonOptional
+	LocalHost        string   // jsonOptional
-	LocalPort        string // jsonOptional
+	LocalPort        string   // jsonOptional
-	RemoteHost       string // jsonOptional
+	RemoteHost       string   // jsonOptional
-	RemotePort       string // jsonOptional
+	RemotePort       string   // jsonOptional
-
+	AlternativeNames []string // jsonOptional
 	// defaults set in ProcessRawConfig
 	UDP           bool   // nullable
 	BrowserSig    string // nullable
 	Transport     string // nullable
+	CDNOriginHost string // nullable
+	CDNWsUrlPath  string // nullable
 	StreamTimeout int    // nullable
 	KeepAlive     int    // nullable
 }
 
 type RemoteConnConfig struct {
-	Singleplex     bool
+	Singleplex bool
-	NumConn        int
+	NumConn    int
-	KeepAlive      time.Duration
+	KeepAlive  time.Duration
-	RemoteAddr     string
+	RemoteAddr string
-	TransportMaker func() Transport
+	Transport  TransportConfig
 }
 
 type LocalConnConfig struct {
-	LocalAddr string
+	LocalAddr      string
-	Timeout   time.Duration
+	Timeout        time.Duration
+	MockDomainList []string
 }
 
 type AuthInfo struct {
@@ -93,6 +97,20 @@ func ssvToJson(ssv string) (ret []byte) {
 		}
 		key := sp[0]
 		value := sp[1]
+		if strings.HasPrefix(key, "AlternativeNames") {
+			switch strings.Contains(value, ",") {
+			case true:
+				domains := strings.Split(value, ",")
+				for index, domain := range domains {
+					domains[index] = `"` + domain + `"`
+				}
+				value = strings.Join(domains, ",")
+				ret = append(ret, []byte(`"`+key+`":[`+value+`],`)...)
+			case false:
+				ret = append(ret, []byte(`"`+key+`":["`+value+`"],`)...)
+			}
+			continue
+		}
 		// JSON doesn't like quotation marks around int and bool
 		// This is extremely ugly but it's still better than writing a tokeniser
 		if elem(key, unquoted) {
@@ -138,6 +156,17 @@ func (raw *RawConfig) ProcessRawConfig(worldState common.WorldState) (local Loca
 		return nullErr("ServerName")
 	}
 	auth.MockDomain = raw.ServerName
+
+	var filteredAlternativeNames []string
+	for _, alternativeName := range raw.AlternativeNames {
+		if len(alternativeName) > 0 {
+			filteredAlternativeNames = append(filteredAlternativeNames, alternativeName)
+		}
+	}
+	raw.AlternativeNames = filteredAlternativeNames
+
+	local.MockDomainList = raw.AlternativeNames
+	local.MockDomainList = append(local.MockDomainList, auth.MockDomain)
 	if raw.ProxyMethod == "" {
 		return nullErr("ServerName")
 	}
@@ -161,11 +190,13 @@ func (raw *RawConfig) ProcessRawConfig(worldState common.WorldState) (local Loca
 	// Encryption method
 	switch strings.ToLower(raw.EncryptionMethod) {
 	case "plain":
-		auth.EncryptionMethod = mux.E_METHOD_PLAIN
+		auth.EncryptionMethod = mux.EncryptionMethodPlain
-	case "aes-gcm":
+	case "aes-gcm", "aes-256-gcm":
-		auth.EncryptionMethod = mux.E_METHOD_AES_GCM
+		auth.EncryptionMethod = mux.EncryptionMethodAES256GCM
+	case "aes-128-gcm":
+		auth.EncryptionMethod = mux.EncryptionMethodAES128GCM
 	case "chacha20-poly1305":
-		auth.EncryptionMethod = mux.E_METHOD_CHACHA20_POLY1305
+		auth.EncryptionMethod = mux.EncryptionMethodChaha20Poly1305
 	default:
 		err = fmt.Errorf("unknown encryption method %v", raw.EncryptionMethod)
 		return
@@ -189,10 +220,19 @@ func (raw *RawConfig) ProcessRawConfig(worldState common.WorldState) (local Loca
 	// Transport and (if TLS mode), browser
 	switch strings.ToLower(raw.Transport) {
 	case "cdn":
-		remote.TransportMaker = func() Transport {
+		var cdnDomainPort string
-			return &WSOverTLS{
+		if raw.CDNOriginHost == "" {
-				cdnDomainPort: remote.RemoteAddr,
+			cdnDomainPort = net.JoinHostPort(raw.RemoteHost, raw.RemotePort)
-			}
+		} else {
+			cdnDomainPort = net.JoinHostPort(raw.CDNOriginHost, raw.RemotePort)
+		}
+		if raw.CDNWsUrlPath == "" {
+			raw.CDNWsUrlPath = "/"
+		}
+
+		remote.Transport = TransportConfig{
+			mode:  "cdn",
+			wsUrl: "ws://" + cdnDomainPort + raw.CDNWsUrlPath,
 		}
 	case "direct":
 		fallthrough
@@ -200,16 +240,17 @@ func (raw *RawConfig) ProcessRawConfig(worldState common.WorldState) (local Loca
 		var browser browser
 		switch strings.ToLower(raw.BrowserSig) {
 		case "firefox":
-			browser = &Firefox{}
+			browser = firefox
+		case "safari":
+			browser = safari
 		case "chrome":
 			fallthrough
 		default:
-			browser = &Chrome{}
+			browser = chrome
 		}
-		remote.TransportMaker = func() Transport {
+		remote.Transport = TransportConfig{
-			return &DirectTLS{
+			mode:    "direct",
-				browser: browser,
+			browser: browser,
-			}
 		}
 	}
 

internal/client/state_test.go

@@ -1,9 +1,10 @@
 package client
 
 import (
-	"github.com/stretchr/testify/assert"
 	"io/ioutil"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestParseConfig(t *testing.T) {

internal/client/transport.go

@@ -8,3 +8,26 @@ type Transport interface {
 	Handshake(rawConn net.Conn, authInfo AuthInfo) (sessionKey [32]byte, err error)
 	net.Conn
 }
+
+type TransportConfig struct {
+	mode string
+
+	wsUrl string
+
+	browser browser
+}
+
+func (t TransportConfig) CreateTransport() Transport {
+	switch t.mode {
+	case "cdn":
+		return &WSOverTLS{
+			wsUrl: t.wsUrl,
+		}
+	case "direct":
+		return &DirectTLS{
+			browser: t.browser,
+		}
+	default:
+		return nil
+	}
+}

internal/client/websocket.go

@@ -4,17 +4,18 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/gorilla/websocket"
-	utls "github.com/refraction-networking/utls"
 	"net"
 	"net/http"
 	"net/url"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/gorilla/websocket"
+	utls "github.com/refraction-networking/utls"
 )
 
 type WSOverTLS struct {
 	*common.WebSocketConn
-	cdnDomainPort string
+	wsUrl string
 }
 
 func (ws *WSOverTLS) Handshake(rawConn net.Conn, authInfo AuthInfo) (sessionKey [32]byte, err error) {
@@ -23,12 +24,24 @@ func (ws *WSOverTLS) Handshake(rawConn net.Conn, authInfo AuthInfo) (sessionKey
 		InsecureSkipVerify: true,
 	}
 	uconn := utls.UClient(rawConn, utlsConfig, utls.HelloChrome_Auto)
+	err = uconn.BuildHandshakeState()
+	if err != nil {
+		return
+	}
+	for i, extension := range uconn.Extensions {
+		_, ok := extension.(*utls.ALPNExtension)
+		if ok {
+			uconn.Extensions = append(uconn.Extensions[:i], uconn.Extensions[i+1:]...)
+			break
+		}
+	}
+
 	err = uconn.Handshake()
 	if err != nil {
 		return
 	}
 
-	u, err := url.Parse("ws://" + ws.cdnDomainPort)
+	u, err := url.Parse(ws.wsUrl)
 	if err != nil {
 		return sessionKey, fmt.Errorf("failed to parse ws url: %v", err)
 	}

internal/common/crypto.go

@@ -6,6 +6,7 @@ import (
 	"crypto/rand"
 	"errors"
 	"io"
+	"math/big"
 	"time"
 
 	log "github.com/sirupsen/logrus"
@@ -52,8 +53,8 @@ func CryptoRandRead(buf []byte) {
 	RandRead(rand.Reader, buf)
 }
 
-func RandRead(randSource io.Reader, buf []byte) {
+func backoff(f func() error) {
-	_, err := randSource.Read(buf)
+	err := f()
 	if err == nil {
 		return
 	}
@@ -61,12 +62,36 @@ func RandRead(randSource io.Reader, buf []byte) {
 		100 * time.Millisecond, 300 * time.Millisecond, 500 * time.Millisecond, 1 * time.Second,
 		3 * time.Second, 5 * time.Second}
 	for i := 0; i < 10; i++ {
-		log.Errorf("Failed to get random bytes: %v. Retrying...", err)
+		log.Errorf("Failed to get random: %v. Retrying...", err)
-		_, err = randSource.Read(buf)
+		err = f()
 		if err == nil {
 			return
 		}
 		time.Sleep(waitDur[i])
 	}
-	log.Fatal("Cannot get random bytes after 10 retries")
+	log.Fatal("Cannot get random after 10 retries")
+}
+
+func RandRead(randSource io.Reader, buf []byte) {
+	backoff(func() error {
+		_, err := randSource.Read(buf)
+		return err
+	})
+}
+
+func RandItem[T any](list []T) T {
+	return list[RandInt(len(list))]
+}
+
+func RandInt(n int) int {
+	s := new(int)
+	backoff(func() error {
+		size, err := rand.Int(rand.Reader, big.NewInt(int64(n)))
+		if err != nil {
+			return err
+		}
+		*s = int(size.Int64())
+		return nil
+	})
+	return *s
 }

internal/common/crypto_test.go

@@ -4,10 +4,11 @@ import (
 	"bytes"
 	"encoding/hex"
 	"errors"
-	"github.com/stretchr/testify/assert"
 	"io"
 	"math/rand"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 const gcmTagSize = 16

internal/common/tls.go

@@ -2,6 +2,7 @@ package common
 
 import (
 	"encoding/binary"
+	"errors"
 	"io"
 	"net"
 	"sync"
@@ -36,18 +37,17 @@ func AddRecordLayer(input []byte, typ byte, ver uint16) []byte {
 
 type TLSConn struct {
 	net.Conn
-	writeM   sync.Mutex
+	writeBufPool sync.Pool
-	writeBuf []byte
 }
 
 func NewTLSConn(conn net.Conn) *TLSConn {
-	writeBuf := make([]byte, initialWriteBufSize)
-	writeBuf[0] = ApplicationData
-	writeBuf[1] = byte(VersionTLS13 >> 8)
-	writeBuf[2] = byte(VersionTLS13 & 0xFF)
 	return &TLSConn{
-		Conn:     conn,
+		Conn: conn,
-		writeBuf: writeBuf,
+		writeBufPool: sync.Pool{New: func() interface{} {
+			b := make([]byte, 0, initialWriteBufSize)
+			b = append(b, ApplicationData, byte(VersionTLS13>>8), byte(VersionTLS13&0xFF))
+			return &b
+		}},
 	}
 }
 
@@ -95,12 +95,15 @@ func (tls *TLSConn) Read(buffer []byte) (n int, err error) {
 
 func (tls *TLSConn) Write(in []byte) (n int, err error) {
 	msgLen := len(in)
-	tls.writeM.Lock()
+	if msgLen > 1<<14+256 { // https://tools.ietf.org/html/rfc8446#section-5.2
-	tls.writeBuf = append(tls.writeBuf[:5], in...)
+		return 0, errors.New("message is too long")
-	tls.writeBuf[3] = byte(msgLen >> 8)
+	}
-	tls.writeBuf[4] = byte(msgLen & 0xFF)
+	writeBuf := tls.writeBufPool.Get().(*[]byte)
-	n, err = tls.Conn.Write(tls.writeBuf[:recordLayerLength+msgLen])
+	*writeBuf = append(*writeBuf, byte(msgLen>>8), byte(msgLen&0xFF))
-	tls.writeM.Unlock()
+	*writeBuf = append(*writeBuf, in...)
+	n, err = tls.Conn.Write(*writeBuf)
+	*writeBuf = (*writeBuf)[:3]
+	tls.writeBufPool.Put(writeBuf)
 	return n - recordLayerLength, err
 }
 

internal/common/websocket.go

@@ -2,10 +2,11 @@ package common
 
 import (
 	"errors"
-	"github.com/gorilla/websocket"
 	"io"
 	"sync"
 	"time"
+
+	"github.com/gorilla/websocket"
 )
 
 // WebSocketConn implements io.ReadWriteCloser

internal/ecdh/curve25519.go

@@ -68,13 +68,11 @@ func Unmarshal(data []byte) (crypto.PublicKey, bool) {
 	return &pub, true
 }
 
-func GenerateSharedSecret(privKey crypto.PrivateKey, pubKey crypto.PublicKey) []byte {
+func GenerateSharedSecret(privKey crypto.PrivateKey, pubKey crypto.PublicKey) ([]byte, error) {
-	var priv, pub, secret *[32]byte
+	var priv, pub *[32]byte
 
 	priv = privKey.(*[32]byte)
 	pub = pubKey.(*[32]byte)
-	secret = new([32]byte)
 
-	curve25519.ScalarMult(secret, priv, pub)
+	return curve25519.X25519(priv[:], pub[:])
-	return secret[:]
 }

internal/ecdh/curve25519_test.go

@@ -90,11 +90,11 @@ func testECDH(t testing.TB) {
 		t.Fatalf("Unmarshal does not work")
 	}
 
-	secret1 = GenerateSharedSecret(privKey1, pubKey2)
+	secret1, err = GenerateSharedSecret(privKey1, pubKey2)
 	if err != nil {
 		t.Error(err)
 	}
-	secret2 = GenerateSharedSecret(privKey2, pubKey1)
+	secret2, err = GenerateSharedSecret(privKey2, pubKey1)
 	if err != nil {
 		t.Error(err)
 	}

internal/multiplex/datagramBufferedPipe.go

@@ -13,18 +13,20 @@ import (
 // instead of byte-oriented. The integrity of datagrams written into this buffer is preserved.
 // it won't get chopped up into individual bytes
 type datagramBufferedPipe struct {
-	pLens []int
+	pLens     []int
-	// lazily allocated
 	buf       *bytes.Buffer
 	closed    bool
 	rwCond    *sync.Cond
 	wtTimeout time.Duration
 	rDeadline time.Time
+
+	timeoutTimer *time.Timer
 }
 
 func NewDatagramBufferedPipe() *datagramBufferedPipe {
 	d := &datagramBufferedPipe{
 		rwCond: sync.NewCond(&sync.Mutex{}),
+		buf:    new(bytes.Buffer),
 	}
 	return d
 }
@@ -32,25 +34,25 @@ func NewDatagramBufferedPipe() *datagramBufferedPipe {
 func (d *datagramBufferedPipe) Read(target []byte) (int, error) {
 	d.rwCond.L.Lock()
 	defer d.rwCond.L.Unlock()
-	if d.buf == nil {
-		d.buf = new(bytes.Buffer)
-	}
 	for {
 		if d.closed && len(d.pLens) == 0 {
 			return 0, io.EOF
 		}
 
-		if !d.rDeadline.IsZero() {
+		hasRDeadline := !d.rDeadline.IsZero()
-			delta := time.Until(d.rDeadline)
+		if hasRDeadline {
-			if delta <= 0 {
+			if time.Until(d.rDeadline) <= 0 {
 				return 0, ErrTimeout
 			}
-			time.AfterFunc(delta, d.rwCond.Broadcast)
 		}
 
 		if len(d.pLens) > 0 {
 			break
 		}
+
+		if hasRDeadline {
+			d.broadcastAfter(time.Until(d.rDeadline))
+		}
 		d.rwCond.Wait()
 	}
 	dataLen := d.pLens[0]
@@ -64,53 +66,9 @@ func (d *datagramBufferedPipe) Read(target []byte) (int, error) {
 	return dataLen, nil
 }
 
-func (d *datagramBufferedPipe) WriteTo(w io.Writer) (n int64, err error) {
+func (d *datagramBufferedPipe) Write(f *Frame) (toBeClosed bool, err error) {
 	d.rwCond.L.Lock()
 	defer d.rwCond.L.Unlock()
-	if d.buf == nil {
-		d.buf = new(bytes.Buffer)
-	}
-	for {
-		if d.closed && len(d.pLens) == 0 {
-			return 0, io.EOF
-		}
-		if !d.rDeadline.IsZero() {
-			delta := time.Until(d.rDeadline)
-			if delta <= 0 {
-				return 0, ErrTimeout
-			}
-			if d.wtTimeout == 0 {
-				// if there hasn't been a scheduled broadcast
-				time.AfterFunc(delta, d.rwCond.Broadcast)
-			}
-		}
-		if d.wtTimeout != 0 {
-			d.rDeadline = time.Now().Add(d.wtTimeout)
-			time.AfterFunc(d.wtTimeout, d.rwCond.Broadcast)
-		}
-
-		if len(d.pLens) > 0 {
-			var dataLen int
-			dataLen, d.pLens = d.pLens[0], d.pLens[1:]
-			written, er := w.Write(d.buf.Next(dataLen))
-			n += int64(written)
-			if er != nil {
-				d.rwCond.Broadcast()
-				return n, er
-			}
-			d.rwCond.Broadcast()
-		} else {
-			d.rwCond.Wait()
-		}
-	}
-}
-
-func (d *datagramBufferedPipe) Write(f Frame) (toBeClosed bool, err error) {
-	d.rwCond.L.Lock()
-	defer d.rwCond.L.Unlock()
-	if d.buf == nil {
-		d.buf = new(bytes.Buffer)
-	}
 	for {
 		if d.closed {
 			return true, io.ErrClosedPipe
@@ -122,7 +80,7 @@ func (d *datagramBufferedPipe) Write(f Frame) (toBeClosed bool, err error) {
 		d.rwCond.Wait()
 	}
 
-	if f.Closing != C_NOOP {
+	if f.Closing != closingNothing {
 		d.closed = true
 		d.rwCond.Broadcast()
 		return true, nil
@@ -153,10 +111,9 @@ func (d *datagramBufferedPipe) SetReadDeadline(t time.Time) {
 	d.rwCond.Broadcast()
 }
 
-func (d *datagramBufferedPipe) SetWriteToTimeout(t time.Duration) {
+func (d *datagramBufferedPipe) broadcastAfter(t time.Duration) {
-	d.rwCond.L.Lock()
+	if d.timeoutTimer != nil {
-	defer d.rwCond.L.Unlock()
+		d.timeoutTimer.Stop()
-
+	}
-	d.wtTimeout = t
+	d.timeoutTimer = time.AfterFunc(t, d.rwCond.Broadcast)
-	d.rwCond.Broadcast()
 }

internal/multiplex/datagramBufferedPipe_test.go

@@ -1,74 +1,37 @@
 package multiplex
 
 import (
-	"bytes"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/assert"
 )
 
 func TestDatagramBuffer_RW(t *testing.T) {
 	b := []byte{0x01, 0x02, 0x03}
 	t.Run("simple write", func(t *testing.T) {
 		pipe := NewDatagramBufferedPipe()
-		_, err := pipe.Write(Frame{Payload: b})
+		_, err := pipe.Write(&Frame{Payload: b})
-		if err != nil {
+		assert.NoError(t, err)
-			t.Error(
-				"expecting", "nil error",
-				"got", err,
-			)
-			return
-		}
 	})
 
 	t.Run("simple read", func(t *testing.T) {
 		pipe := NewDatagramBufferedPipe()
-		_, _ = pipe.Write(Frame{Payload: b})
+		_, _ = pipe.Write(&Frame{Payload: b})
 		b2 := make([]byte, len(b))
 		n, err := pipe.Read(b2)
-		if n != len(b) {
+		assert.NoError(t, err)
-			t.Error(
+		assert.Equal(t, len(b), n)
-				"For", "number of bytes read",
+		assert.Equal(t, b, b2)
-				"expecting", len(b),
+		assert.Equal(t, 0, pipe.buf.Len(), "buf len is not 0 after finished reading")
-				"got", n,
-			)
-			return
-		}
-		if err != nil {
-			t.Error(
-				"expecting", "nil error",
-				"got", err,
-			)
-			return
-		}
-		if !bytes.Equal(b, b2) {
-			t.Error(
-				"expecting", b,
-				"got", b2,
-			)
-		}
-		if pipe.buf.Len() != 0 {
-			t.Error("buf len is not 0 after finished reading")
-			return
-		}
-
 	})
 
 	t.Run("writing closing frame", func(t *testing.T) {
 		pipe := NewDatagramBufferedPipe()
-		toBeClosed, err := pipe.Write(Frame{Closing: C_STREAM})
+		toBeClosed, err := pipe.Write(&Frame{Closing: closingStream})
-		if !toBeClosed {
+		assert.NoError(t, err)
-			t.Error("should be to be closed")
+		assert.True(t, toBeClosed, "should be to be closed")
-		}
+		assert.True(t, pipe.closed, "pipe should be closed")
-		if err != nil {
-			t.Error(
-				"expecting", "nil error",
-				"got", err,
-			)
-			return
-		}
-		if !pipe.closed {
-			t.Error("expecting closed pipe, not closed")
-		}
 	})
 }
 
@@ -76,65 +39,24 @@ func TestDatagramBuffer_BlockingRead(t *testing.T) {
 	pipe := NewDatagramBufferedPipe()
 	b := []byte{0x01, 0x02, 0x03}
 	go func() {
-		time.Sleep(100 * time.Millisecond)
+		time.Sleep(readBlockTime)
-		pipe.Write(Frame{Payload: b})
+		pipe.Write(&Frame{Payload: b})
 	}()
 	b2 := make([]byte, len(b))
 	n, err := pipe.Read(b2)
-	if n != len(b) {
+	assert.NoError(t, err)
-		t.Error(
+	assert.Equal(t, len(b), n, "number of bytes read after block is wrong")
-			"For", "number of bytes read after block",
+	assert.Equal(t, b, b2)
-			"expecting", len(b),
-			"got", n,
-		)
-		return
-	}
-	if err != nil {
-		t.Error(
-			"For", "blocked read",
-			"expecting", "nil error",
-			"got", err,
-		)
-		return
-	}
-	if !bytes.Equal(b, b2) {
-		t.Error(
-			"For", "blocked read",
-			"expecting", b,
-			"got", b2,
-		)
-		return
-	}
 }
 
 func TestDatagramBuffer_CloseThenRead(t *testing.T) {
 	pipe := NewDatagramBufferedPipe()
 	b := []byte{0x01, 0x02, 0x03}
-	pipe.Write(Frame{Payload: b})
+	pipe.Write(&Frame{Payload: b})
 	b2 := make([]byte, len(b))
 	pipe.Close()
 	n, err := pipe.Read(b2)
-	if n != len(b) {
+	assert.NoError(t, err)
-		t.Error(
+	assert.Equal(t, len(b), n, "number of bytes read after block is wrong")
-			"For", "number of bytes read",
+	assert.Equal(t, b, b2)
-			"expecting", len(b),
-			"got", n,
-		)
-	}
-	if err != nil {
-		t.Error(
-			"For", "simple read",
-			"expecting", "nil error",
-			"got", err,
-		)
-		return
-	}
-	if !bytes.Equal(b, b2) {
-		t.Error(
-			"For", "simple read",
-			"expecting", b,
-			"got", b2,
-		)
-		return
-	}
 }

internal/multiplex/frame.go

@@ -1,9 +1,9 @@
 package multiplex
 
 const (
-	C_NOOP = iota
+	closingNothing = iota
-	C_STREAM
+	closingStream
-	C_SESSION
+	closingSession
 )
 
 type Frame struct {

internal/multiplex/mux_test.go

@@ -2,14 +2,15 @@ package multiplex
 
 import (
 	"bytes"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/cbeuw/connutil"
 	"io"
 	"math/rand"
 	"net"
 	"sync"
 	"testing"
-	"time"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/cbeuw/connutil"
+	"github.com/stretchr/testify/assert"
 )
 
 func serveEcho(l net.Listener) {
@@ -19,13 +20,13 @@ func serveEcho(l net.Listener) {
 			// TODO: pass the error back
 			return
 		}
-		go func() {
+		go func(conn net.Conn) {
 			_, err := io.Copy(conn, conn)
 			if err != nil {
 				// TODO: pass the error back
 				return
 			}
-		}()
+		}(conn)
 	}
 }
 
@@ -37,7 +38,7 @@ type connPair struct {
 func makeSessionPair(numConn int) (*Session, *Session, []*connPair) {
 	sessionKey := [32]byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31}
 	sessionId := 1
-	obfuscator, _ := MakeObfuscator(E_METHOD_CHACHA20_POLY1305, sessionKey)
+	obfuscator, _ := MakeObfuscator(EncryptionMethodChaha20Poly1305, sessionKey)
 	clientConfig := SessionConfig{
 		Obfuscator: obfuscator,
 		Valve:      nil,
@@ -63,31 +64,36 @@ func makeSessionPair(numConn int) (*Session, *Session, []*connPair) {
 	return clientSession, serverSession, paris
 }
 
-func runEchoTest(t *testing.T, streams []*Stream) {
+func runEchoTest(t *testing.T, conns []net.Conn, msgLen int) {
-	const testDataLen = 16384
 	var wg sync.WaitGroup
-	for _, stream := range streams {
+
+	for _, conn := range conns {
 		wg.Add(1)
-		go func(stream *Stream) {
+		go func(conn net.Conn) {
-			testData := make([]byte, testDataLen)
+			defer wg.Done()
+
+			testData := make([]byte, msgLen)
 			rand.Read(testData)
 
-			n, err := stream.Write(testData)
+			// we cannot call t.Fatalf in concurrent contexts
-			if n != testDataLen {
+			n, err := conn.Write(testData)
-				t.Fatalf("written only %v, err %v", n, err)
+			if n != msgLen {
+				t.Errorf("written only %v, err %v", n, err)
+				return
 			}
 
-			recvBuf := make([]byte, testDataLen)
+			recvBuf := make([]byte, msgLen)
-			_, err = io.ReadFull(stream, recvBuf)
+			_, err = io.ReadFull(conn, recvBuf)
 			if err != nil {
-				t.Fatalf("failed to read back: %v", err)
+				t.Errorf("failed to read back: %v", err)
+				return
 			}
 
 			if !bytes.Equal(testData, recvBuf) {
-				t.Fatalf("echoed data not correct")
+				t.Errorf("echoed data not correct")
+				return
 			}
-			wg.Done()
+		}(conn)
-		}(stream)
 	}
 	wg.Wait()
 }
@@ -95,43 +101,32 @@ func runEchoTest(t *testing.T, streams []*Stream) {
 func TestMultiplex(t *testing.T) {
 	const numStreams = 2000 // -race option limits the number of goroutines to 8192
 	const numConns = 4
+	const msgLen = 16384
 
 	clientSession, serverSession, _ := makeSessionPair(numConns)
 	go serveEcho(serverSession)
 
-	streams := make([]*Stream, numStreams)
+	streams := make([]net.Conn, numStreams)
 	for i := 0; i < numStreams; i++ {
 		stream, err := clientSession.OpenStream()
-		if err != nil {
+		assert.NoError(t, err)
-			t.Fatalf("failed to open stream: %v", err)
-		}
 		streams[i] = stream
 	}
 
 	//test echo
-	runEchoTest(t, streams)
+	runEchoTest(t, streams, msgLen)
-	if clientSession.streamCount() != numStreams {
+
-		t.Errorf("client stream count is wrong: %v", clientSession.streamCount())
+	assert.EqualValues(t, numStreams, clientSession.streamCount(), "client stream count is wrong")
-	}
+	assert.EqualValues(t, numStreams, serverSession.streamCount(), "server stream count is wrong")
-	if serverSession.streamCount() != numStreams {
-		t.Errorf("server stream count is wrong: %v", serverSession.streamCount())
-	}
 
 	// close one stream
 	closing, streams := streams[0], streams[1:]
 	err := closing.Close()
-	if err != nil {
+	assert.NoError(t, err, "couldn't close a stream")
-		t.Errorf("couldn't close a stream")
-	}
 	_, err = closing.Write([]byte{0})
-	if err != ErrBrokenStream {
+	assert.Equal(t, ErrBrokenStream, err)
-		t.Errorf("expecting error %v, got %v", ErrBrokenStream, err)
-	}
 	_, err = closing.Read(make([]byte, 1))
-	if err != ErrBrokenStream {
+	assert.Equal(t, ErrBrokenStream, err)
-		t.Errorf("expecting error %v, got %v", ErrBrokenStream, err)
-	}
-
 }
 
 func TestMux_StreamClosing(t *testing.T) {
@@ -143,17 +138,13 @@ func TestMux_StreamClosing(t *testing.T) {
 	recvBuf := make([]byte, 128)
 	toBeClosed, _ := clientSession.OpenStream()
 	_, err := toBeClosed.Write(testData) // should be echoed back
-	if err != nil {
+	assert.NoError(t, err, "couldn't write to a stream")
-		t.Errorf("can't write to stream: %v", err)
+
-	}
+	_, err = io.ReadFull(toBeClosed, recvBuf[:1])
+	assert.NoError(t, err, "can't read anything before stream closed")
 
-	time.Sleep(500 * time.Millisecond)
 	_ = toBeClosed.Close()
-	_, err = io.ReadFull(toBeClosed, recvBuf)
+	_, err = io.ReadFull(toBeClosed, recvBuf[1:])
-	if err != nil {
+	assert.NoError(t, err, "can't read residual data on stream")
-		t.Errorf("can't read residual data on stream: %v", err)
+	assert.Equal(t, testData, recvBuf, "incorrect data read back")
-	}
-	if !bytes.Equal(testData, recvBuf) {
-		t.Errorf("incorrect data read back")
-	}
 }

internal/multiplex/obfs.go

@@ -3,6 +3,7 @@ package multiplex
 import (
 	"crypto/aes"
 	"crypto/cipher"
+	"crypto/rand"
 	"encoding/binary"
 	"errors"
 	"fmt"
@@ -11,187 +12,190 @@ import (
 	"golang.org/x/crypto/salsa20"
 )
 
-type Obfser func(*Frame, []byte, int) (int, error)
+const frameHeaderLength = 14
-type Deobfser func([]byte) (*Frame, error)
-
-var u32 = binary.BigEndian.Uint32
-var u64 = binary.BigEndian.Uint64
-var putU32 = binary.BigEndian.PutUint32
-var putU64 = binary.BigEndian.PutUint64
-
-const HEADER_LEN = 14
 const salsa20NonceSize = 8
 
+// maxExtraLen equals the max length of padding + AEAD tag.
+// It is 255 bytes because the extra len field in frame header is only one byte.
+const maxExtraLen = 1<<8 - 1
+
+// padFirstNFrames specifies the number of initial frames to pad,
+// to avoid TLS-in-TLS detection
+const padFirstNFrames = 5
+
 const (
-	E_METHOD_PLAIN = iota
+	EncryptionMethodPlain = iota
-	E_METHOD_AES_GCM
+	EncryptionMethodAES256GCM
-	E_METHOD_CHACHA20_POLY1305
+	EncryptionMethodChaha20Poly1305
+	EncryptionMethodAES128GCM
 )
 
-// Obfuscator is responsible for the obfuscation and deobfuscation of frames
+// Obfuscator is responsible for serialisation, obfuscation, and optional encryption of data frames.
 type Obfuscator struct {
-	// Used in Stream.Write. Add multiplexing headers, encrypt and add TLS header
+	payloadCipher cipher.AEAD
-	Obfs Obfser
-	// Remove TLS header, decrypt and unmarshall frames
-	Deobfs     Deobfser
-	SessionKey [32]byte
 
-	maxOverhead int
+	sessionKey [32]byte
 }
 
-// MakeObfs returns a function of type Obfser. An Obfser takes three arguments:
+// obfuscate adds multiplexing headers, encrypt and add TLS header
-// a *Frame with all the field set correctly, a []byte as buffer to put encrypted
+func (o *Obfuscator) obfuscate(f *Frame, buf []byte, payloadOffsetInBuf int) (int, error) {
-// message in, and an int called payloadOffsetInBuf to be used when *Frame.payload
+	// The method here is to use the first payloadCipher.NonceSize() bytes of the serialised frame header
-// is in the byte slice used as buffer (2nd argument). payloadOffsetInBuf specifies
+	// as iv/nonce for the AEAD cipher to encrypt the frame payload. Then we use
-// the index at which data belonging to *Frame.Payload starts in the buffer.
+	// the authentication tag produced appended to the end of the ciphertext (of size payloadCipher.Overhead())
-func MakeObfs(salsaKey [32]byte, payloadCipher cipher.AEAD) Obfser {
+	// as nonce for Salsa20 to encrypt the frame header. Both with sessionKey as keys.
-	obfs := func(f *Frame, buf []byte, payloadOffsetInBuf int) (int, error) {
+	//
-		// we need the encrypted data to be at least 8 bytes to be used as nonce for salsa20 stream header encryption
+	// Several cryptographic guarantees we have made here: that payloadCipher, as an AEAD, is given a unique
-		// this will be the case if the encryption method is an AEAD cipher, however for plain, it's well possible
+	// iv/nonce each time, relative to its key; that the frame header encryptor Salsa20 is given a unique
-		// that the frame payload is smaller than 8 bytes, so we need to add on the difference
+	// nonce each time, relative to its key; and that the authenticity of frame header is checked.
-		payloadLen := len(f.Payload)
+	//
-		if payloadLen == 0 {
+	// The payloadCipher is given a unique iv/nonce each time because it is derived from the frame header, which
-			return 0, errors.New("payload cannot be empty")
+	// contains the monotonically increasing stream id (uint32) and frame sequence (uint64). There will be a nonce
-		}
+	// reuse after 2^64-1 frames sent (sent, not received because frames going different ways are sequenced
-		var extraLen int
+	// independently) by a stream, or after 2^32-1 streams created in a single session. We consider these number
-		if payloadCipher == nil {
+	// to be large enough that they may never happen in reasonable time frames. Of course, different sessions
-			extraLen = salsa20NonceSize - payloadLen
+	// will produce the same combination of stream id and frame sequence, but they will have different session keys.
-			if extraLen < 0 {
+	//
-				// if our payload is already greater than 8 bytes
+	//
-				extraLen = 0
+	// Because the frame header, before it being encrypted, is fed into the AEAD, it is also authenticated.
-			}
+	// (rfc5116 s.2.1 "The nonce is authenticated internally to the algorithm").
-		} else {
+	//
-			extraLen = payloadCipher.Overhead()
+	// In case the user chooses to not encrypt the frame payload, payloadCipher will be nil. In this scenario,
-			if extraLen < salsa20NonceSize {
+	// we generate random bytes to be used as salsa20 nonce.
-				return 0, errors.New("AEAD's Overhead cannot be fewer than 8 bytes")
+	payloadLen := len(f.Payload)
-			}
+	if payloadLen == 0 {
-		}
+		return 0, errors.New("payload cannot be empty")
-
-		usefulLen := HEADER_LEN + payloadLen + extraLen
-		if len(buf) < usefulLen {
-			return 0, errors.New("obfs buffer too small")
-		}
-		// we do as much in-place as possible to save allocation
-		payload := buf[HEADER_LEN : HEADER_LEN+payloadLen]
-		if payloadOffsetInBuf != HEADER_LEN {
-			// if payload is not at the correct location in buffer
-			copy(payload, f.Payload)
-		}
-
-		header := buf[:HEADER_LEN]
-		putU32(header[0:4], f.StreamID)
-		putU64(header[4:12], f.Seq)
-		header[12] = f.Closing
-		header[13] = byte(extraLen)
-
-		if payloadCipher == nil {
-			if extraLen != 0 { // read nonce
-				extra := buf[usefulLen-extraLen : usefulLen]
-				common.CryptoRandRead(extra)
-			}
-		} else {
-			payloadCipher.Seal(payload[:0], header[:payloadCipher.NonceSize()], payload, nil)
-		}
-
-		nonce := buf[usefulLen-salsa20NonceSize : usefulLen]
-		salsa20.XORKeyStream(header, header, nonce, &salsaKey)
-
-		return usefulLen, nil
 	}
-	return obfs
+	tagLen := 0
+	if o.payloadCipher != nil {
+		tagLen = o.payloadCipher.Overhead()
+	} else {
+		tagLen = salsa20NonceSize
+	}
+	// Pad to avoid size side channel leak
+	padLen := 0
+	if f.Seq < padFirstNFrames {
+		padLen = common.RandInt(maxExtraLen - tagLen + 1)
+	}
+
+	usefulLen := frameHeaderLength + payloadLen + padLen + tagLen
+	if len(buf) < usefulLen {
+		return 0, errors.New("obfs buffer too small")
+	}
+	// we do as much in-place as possible to save allocation
+	payload := buf[frameHeaderLength : frameHeaderLength+payloadLen+padLen]
+	if payloadOffsetInBuf != frameHeaderLength {
+		// if payload is not at the correct location in buffer
+		copy(payload, f.Payload)
+	}
+
+	header := buf[:frameHeaderLength]
+	binary.BigEndian.PutUint32(header[0:4], f.StreamID)
+	binary.BigEndian.PutUint64(header[4:12], f.Seq)
+	header[12] = f.Closing
+	header[13] = byte(padLen + tagLen)
+
+	// Random bytes for padding and nonce
+	_, err := rand.Read(buf[frameHeaderLength+payloadLen : usefulLen])
+	if err != nil {
+		return 0, fmt.Errorf("failed to pad random: %w", err)
+	}
+
+	if o.payloadCipher != nil {
+		o.payloadCipher.Seal(payload[:0], header[:o.payloadCipher.NonceSize()], payload, nil)
+	}
+
+	nonce := buf[usefulLen-salsa20NonceSize : usefulLen]
+	salsa20.XORKeyStream(header, header, nonce, &o.sessionKey)
+
+	return usefulLen, nil
 }
 
-// MakeDeobfs returns a function Deobfser. A Deobfser takes in a single byte slice,
+// deobfuscate removes TLS header, decrypt and unmarshall frames
-// containing the message to be decrypted, and returns a *Frame containing the frame
+func (o *Obfuscator) deobfuscate(f *Frame, in []byte) error {
-// information and plaintext
+	if len(in) < frameHeaderLength+salsa20NonceSize {
-func MakeDeobfs(salsaKey [32]byte, payloadCipher cipher.AEAD) Deobfser {
+		return fmt.Errorf("input size %v, but it cannot be shorter than %v bytes", len(in), frameHeaderLength+salsa20NonceSize)
-	// stream header length + minimum data size (i.e. nonce size of salsa20)
+	}
-	const minInputLen = HEADER_LEN + salsa20NonceSize
-	deobfs := func(in []byte) (*Frame, error) {
-		if len(in) < minInputLen {
-			return nil, fmt.Errorf("input size %v, but it cannot be shorter than %v bytes", len(in), minInputLen)
-		}
 
-		header := in[:HEADER_LEN]
+	header := in[:frameHeaderLength]
-		pldWithOverHead := in[HEADER_LEN:] // payload + potential overhead
+	pldWithOverHead := in[frameHeaderLength:] // payload + potential overhead
 
-		nonce := in[len(in)-salsa20NonceSize:]
+	nonce := in[len(in)-salsa20NonceSize:]
-		salsa20.XORKeyStream(header, header, nonce, &salsaKey)
+	salsa20.XORKeyStream(header, header, nonce, &o.sessionKey)
 
-		streamID := u32(header[0:4])
+	streamID := binary.BigEndian.Uint32(header[0:4])
-		seq := u64(header[4:12])
+	seq := binary.BigEndian.Uint64(header[4:12])
-		closing := header[12]
+	closing := header[12]
-		extraLen := header[13]
+	extraLen := header[13]
 
-		usefulPayloadLen := len(pldWithOverHead) - int(extraLen)
+	usefulPayloadLen := len(pldWithOverHead) - int(extraLen)
-		if usefulPayloadLen < 0 || usefulPayloadLen > len(pldWithOverHead) {
+	if usefulPayloadLen < 0 || usefulPayloadLen > len(pldWithOverHead) {
-			return nil, errors.New("extra length is negative or extra length is greater than total pldWithOverHead length")
+		return errors.New("extra length is negative or extra length is greater than total pldWithOverHead length")
-		}
+	}
 
-		var outputPayload []byte
+	var outputPayload []byte
 
-		if payloadCipher == nil {
+	if o.payloadCipher == nil {
-			if extraLen == 0 {
+		if extraLen == 0 {
-				outputPayload = pldWithOverHead
+			outputPayload = pldWithOverHead
-			} else {
-				outputPayload = pldWithOverHead[:usefulPayloadLen]
-			}
 		} else {
-			_, err := payloadCipher.Open(pldWithOverHead[:0], header[:payloadCipher.NonceSize()], pldWithOverHead, nil)
-			if err != nil {
-				return nil, err
-			}
 			outputPayload = pldWithOverHead[:usefulPayloadLen]
 		}
-
+	} else {
-		ret := &Frame{
+		_, err := o.payloadCipher.Open(pldWithOverHead[:0], header[:o.payloadCipher.NonceSize()], pldWithOverHead, nil)
-			StreamID: streamID,
+		if err != nil {
-			Seq:      seq,
+			return err
-			Closing:  closing,
-			Payload:  outputPayload,
 		}
-		return ret, nil
+		outputPayload = pldWithOverHead[:usefulPayloadLen]
 	}
-	return deobfs
+
+	f.StreamID = streamID
+	f.Seq = seq
+	f.Closing = closing
+	f.Payload = outputPayload
+	return nil
 }
 
-func MakeObfuscator(encryptionMethod byte, sessionKey [32]byte) (obfuscator Obfuscator, err error) {
+func MakeObfuscator(encryptionMethod byte, sessionKey [32]byte) (o Obfuscator, err error) {
-	obfuscator = Obfuscator{
+	o = Obfuscator{
-		SessionKey: sessionKey,
+		sessionKey: sessionKey,
 	}
-	var payloadCipher cipher.AEAD
 	switch encryptionMethod {
-	case E_METHOD_PLAIN:
+	case EncryptionMethodPlain:
-		payloadCipher = nil
+		o.payloadCipher = nil
-		obfuscator.maxOverhead = salsa20NonceSize
+	case EncryptionMethodAES256GCM:
-	case E_METHOD_AES_GCM:
 		var c cipher.Block
 		c, err = aes.NewCipher(sessionKey[:])
 		if err != nil {
 			return
 		}
-		payloadCipher, err = cipher.NewGCM(c)
+		o.payloadCipher, err = cipher.NewGCM(c)
 		if err != nil {
 			return
 		}
-		obfuscator.maxOverhead = payloadCipher.Overhead()
+	case EncryptionMethodAES128GCM:
-	case E_METHOD_CHACHA20_POLY1305:
+		var c cipher.Block
-		payloadCipher, err = chacha20poly1305.New(sessionKey[:])
+		c, err = aes.NewCipher(sessionKey[:16])
+		if err != nil {
+			return
+		}
+		o.payloadCipher, err = cipher.NewGCM(c)
+		if err != nil {
+			return
+		}
+	case EncryptionMethodChaha20Poly1305:
+		o.payloadCipher, err = chacha20poly1305.New(sessionKey[:])
 		if err != nil {
 			return
 		}
-		obfuscator.maxOverhead = payloadCipher.Overhead()
 	default:
-		return obfuscator, errors.New("Unknown encryption method")
+		return o, fmt.Errorf("unknown encryption method valued %v", encryptionMethod)
 	}
 
-	if payloadCipher != nil {
+	if o.payloadCipher != nil {
-		if payloadCipher.NonceSize() > HEADER_LEN {
+		if o.payloadCipher.NonceSize() > frameHeaderLength {
-			return obfuscator, errors.New("payload AEAD's nonce size cannot be greater than size of frame header")
+			return o, errors.New("payload AEAD's nonce size cannot be greater than size of frame header")
 		}
 	}
 
-	obfuscator.Obfs = MakeObfs(sessionKey, payloadCipher)
-	obfuscator.Deobfs = MakeDeobfs(sessionKey, payloadCipher)
 	return
 }

internal/multiplex/obfs_test.go

@@ -1,75 +1,130 @@
 package multiplex
 
 import (
-	"bytes"
 	"crypto/aes"
 	"crypto/cipher"
-	"golang.org/x/crypto/chacha20poly1305"
 	"math/rand"
 	"reflect"
 	"testing"
 	"testing/quick"
+
+	"github.com/stretchr/testify/assert"
+	"golang.org/x/crypto/chacha20poly1305"
 )
 
 func TestGenerateObfs(t *testing.T) {
 	var sessionKey [32]byte
 	rand.Read(sessionKey[:])
 
-	run := func(obfuscator Obfuscator, ct *testing.T) {
+	run := func(o Obfuscator, t *testing.T) {
 		obfsBuf := make([]byte, 512)
-		f := &Frame{}
+		_testFrame, _ := quick.Value(reflect.TypeOf(Frame{}), rand.New(rand.NewSource(42)))
-		_testFrame, _ := quick.Value(reflect.TypeOf(f), rand.New(rand.NewSource(42)))
+		testFrame := _testFrame.Interface().(Frame)
-		testFrame := _testFrame.Interface().(*Frame)
+		i, err := o.obfuscate(&testFrame, obfsBuf, 0)
-		i, err := obfuscator.Obfs(testFrame, obfsBuf, 0)
+		assert.NoError(t, err)
-		if err != nil {
+		var resultFrame Frame
-			ct.Error("failed to obfs ", err)
-			return
-		}
 
-		resultFrame, err := obfuscator.Deobfs(obfsBuf[:i])
+		err = o.deobfuscate(&resultFrame, obfsBuf[:i])
-		if err != nil {
+		assert.NoError(t, err)
-			ct.Error("failed to deobfs ", err)
+		assert.EqualValues(t, testFrame, resultFrame)
-			return
-		}
-		if !bytes.Equal(testFrame.Payload, resultFrame.Payload) || testFrame.StreamID != resultFrame.StreamID {
-			ct.Error("expecting", testFrame,
-				"got", resultFrame)
-			return
-		}
 	}
 
 	t.Run("plain", func(t *testing.T) {
-		obfuscator, err := MakeObfuscator(E_METHOD_PLAIN, sessionKey)
+		o, err := MakeObfuscator(EncryptionMethodPlain, sessionKey)
-		if err != nil {
+		assert.NoError(t, err)
-			t.Errorf("failed to generate obfuscator %v", err)
+		run(o, t)
-		} else {
-			run(obfuscator, t)
-		}
 	})
-	t.Run("aes-gcm", func(t *testing.T) {
+	t.Run("aes-256-gcm", func(t *testing.T) {
-		obfuscator, err := MakeObfuscator(E_METHOD_AES_GCM, sessionKey)
+		o, err := MakeObfuscator(EncryptionMethodAES256GCM, sessionKey)
-		if err != nil {
+		assert.NoError(t, err)
-			t.Errorf("failed to generate obfuscator %v", err)
+		run(o, t)
-		} else {
+	})
-			run(obfuscator, t)
+	t.Run("aes-128-gcm", func(t *testing.T) {
-		}
+		o, err := MakeObfuscator(EncryptionMethodAES128GCM, sessionKey)
+		assert.NoError(t, err)
+		run(o, t)
 	})
 	t.Run("chacha20-poly1305", func(t *testing.T) {
-		obfuscator, err := MakeObfuscator(E_METHOD_CHACHA20_POLY1305, sessionKey)
+		o, err := MakeObfuscator(EncryptionMethodChaha20Poly1305, sessionKey)
-		if err != nil {
+		assert.NoError(t, err)
-			t.Errorf("failed to generate obfuscator %v", err)
+		run(o, t)
-		} else {
-			run(obfuscator, t)
-		}
 	})
 	t.Run("unknown encryption method", func(t *testing.T) {
 		_, err := MakeObfuscator(0xff, sessionKey)
-		if err == nil {
+		assert.Error(t, err)
-			t.Errorf("unknown encryption mehtod error expected")
-		}
 	})
 }
 
+func TestObfuscate(t *testing.T) {
+	var sessionKey [32]byte
+	rand.Read(sessionKey[:])
+
+	const testPayloadLen = 1024
+	testPayload := make([]byte, testPayloadLen)
+	rand.Read(testPayload)
+	f := Frame{
+		StreamID: 0,
+		Seq:      0,
+		Closing:  0,
+		Payload:  testPayload,
+	}
+
+	runTest := func(t *testing.T, o Obfuscator) {
+		obfsBuf := make([]byte, testPayloadLen*2)
+		n, err := o.obfuscate(&f, obfsBuf, 0)
+		assert.NoError(t, err)
+
+		resultFrame := Frame{}
+		err = o.deobfuscate(&resultFrame, obfsBuf[:n])
+		assert.NoError(t, err)
+
+		assert.EqualValues(t, f, resultFrame)
+	}
+
+	t.Run("plain", func(t *testing.T) {
+		o := Obfuscator{
+			payloadCipher: nil,
+			sessionKey:    sessionKey,
+		}
+		runTest(t, o)
+	})
+
+	t.Run("aes-128-gcm", func(t *testing.T) {
+		c, err := aes.NewCipher(sessionKey[:16])
+		assert.NoError(t, err)
+		payloadCipher, err := cipher.NewGCM(c)
+		assert.NoError(t, err)
+		o := Obfuscator{
+			payloadCipher: payloadCipher,
+			sessionKey:    sessionKey,
+		}
+		runTest(t, o)
+	})
+
+	t.Run("aes-256-gcm", func(t *testing.T) {
+		c, err := aes.NewCipher(sessionKey[:])
+		assert.NoError(t, err)
+		payloadCipher, err := cipher.NewGCM(c)
+		assert.NoError(t, err)
+		o := Obfuscator{
+			payloadCipher: payloadCipher,
+			sessionKey:    sessionKey,
+		}
+		runTest(t, o)
+	})
+
+	t.Run("chacha20-poly1305", func(t *testing.T) {
+		payloadCipher, err := chacha20poly1305.New(sessionKey[:])
+		assert.NoError(t, err)
+		o := Obfuscator{
+			payloadCipher: payloadCipher,
+			sessionKey:    sessionKey,
+		}
+		runTest(t, o)
+	})
+
+}
+
 func BenchmarkObfs(b *testing.B) {
 	testPayload := make([]byte, 1024)
 	rand.Read(testPayload)
@@ -80,7 +135,7 @@ func BenchmarkObfs(b *testing.B) {
 		testPayload,
 	}
 
-	obfsBuf := make([]byte, defaultSendRecvBufSize)
+	obfsBuf := make([]byte, len(testPayload)*2)
 
 	var key [32]byte
 	rand.Read(key[:])
@@ -88,40 +143,53 @@ func BenchmarkObfs(b *testing.B) {
 		c, _ := aes.NewCipher(key[:])
 		payloadCipher, _ := cipher.NewGCM(c)
 
-		obfs := MakeObfs(key, payloadCipher)
+		obfuscator := Obfuscator{
+			payloadCipher: payloadCipher,
+			sessionKey:    key,
+		}
+
 		b.SetBytes(int64(len(testFrame.Payload)))
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			obfs(testFrame, obfsBuf, 0)
+			obfuscator.obfuscate(testFrame, obfsBuf, 0)
 		}
 	})
 	b.Run("AES128GCM", func(b *testing.B) {
 		c, _ := aes.NewCipher(key[:16])
 		payloadCipher, _ := cipher.NewGCM(c)
 
-		obfs := MakeObfs(key, payloadCipher)
+		obfuscator := Obfuscator{
+			payloadCipher: payloadCipher,
+			sessionKey:    key,
+		}
 		b.SetBytes(int64(len(testFrame.Payload)))
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			obfs(testFrame, obfsBuf, 0)
+			obfuscator.obfuscate(testFrame, obfsBuf, 0)
 		}
 	})
 	b.Run("plain", func(b *testing.B) {
-		obfs := MakeObfs(key, nil)
+		obfuscator := Obfuscator{
+			payloadCipher: nil,
+			sessionKey:    key,
+		}
 		b.SetBytes(int64(len(testFrame.Payload)))
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			obfs(testFrame, obfsBuf, 0)
+			obfuscator.obfuscate(testFrame, obfsBuf, 0)
 		}
 	})
 	b.Run("chacha20Poly1305", func(b *testing.B) {
-		payloadCipher, _ := chacha20poly1305.New(key[:16])
+		payloadCipher, _ := chacha20poly1305.New(key[:])
 
-		obfs := MakeObfs(key, payloadCipher)
+		obfuscator := Obfuscator{
+			payloadCipher: payloadCipher,
+			sessionKey:    key,
+		}
 		b.SetBytes(int64(len(testFrame.Payload)))
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			obfs(testFrame, obfsBuf, 0)
+			obfuscator.obfuscate(testFrame, obfsBuf, 0)
 		}
 	})
 }
@@ -136,60 +204,73 @@ func BenchmarkDeobfs(b *testing.B) {
 		testPayload,
 	}
 
-	obfsBuf := make([]byte, defaultSendRecvBufSize)
+	obfsBuf := make([]byte, len(testPayload)*2)
 
 	var key [32]byte
 	rand.Read(key[:])
 	b.Run("AES256GCM", func(b *testing.B) {
 		c, _ := aes.NewCipher(key[:])
 		payloadCipher, _ := cipher.NewGCM(c)
+		obfuscator := Obfuscator{
+			payloadCipher: payloadCipher,
+			sessionKey:    key,
+		}
 
-		obfs := MakeObfs(key, payloadCipher)
+		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)
-		n, _ := obfs(testFrame, obfsBuf, 0)
-		deobfs := MakeDeobfs(key, payloadCipher)
 
+		frame := new(Frame)
 		b.SetBytes(int64(n))
 		b.ResetTimer()
 		for i := 0; i < b.N; i++ {
-			deobfs(obfsBuf[:n])
+			obfuscator.deobfuscate(frame, obfsBuf[:n])
 		}
 	})
 	b.Run("AES128GCM", func(b *testing.B) {
 		c, _ := aes.NewCipher(key[:16])
 		payloadCipher, _ := cipher.NewGCM(c)
 
-		obfs := MakeObfs(key, payloadCipher)
+		obfuscator := Obfuscator{
-		n, _ := obfs(testFrame, obfsBuf, 0)
+			payloadCipher: payloadCipher,
-		deobfs := MakeDeobfs(key, payloadCipher)
+			sessionKey:    key,
+		}
+		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)
 
+		frame := new(Frame)
 		b.ResetTimer()
 		b.SetBytes(int64(n))
 		for i := 0; i < b.N; i++ {
-			deobfs(obfsBuf[:n])
+			obfuscator.deobfuscate(frame, obfsBuf[:n])
 		}
 	})
 	b.Run("plain", func(b *testing.B) {
-		obfs := MakeObfs(key, nil)
+		obfuscator := Obfuscator{
-		n, _ := obfs(testFrame, obfsBuf, 0)
+			payloadCipher: nil,
-		deobfs := MakeDeobfs(key, nil)
+			sessionKey:    key,
+		}
+		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)
 
+		frame := new(Frame)
 		b.ResetTimer()
 		b.SetBytes(int64(n))
 		for i := 0; i < b.N; i++ {
-			deobfs(obfsBuf[:n])
+			obfuscator.deobfuscate(frame, obfsBuf[:n])
 		}
 	})
 	b.Run("chacha20Poly1305", func(b *testing.B) {
-		payloadCipher, _ := chacha20poly1305.New(key[:16])
+		payloadCipher, _ := chacha20poly1305.New(key[:])
 
-		obfs := MakeObfs(key, payloadCipher)
+		obfuscator := Obfuscator{
-		n, _ := obfs(testFrame, obfsBuf, 0)
+			payloadCipher: payloadCipher,
-		deobfs := MakeDeobfs(key, payloadCipher)
+			sessionKey:    key,
+		}
 
+		n, _ := obfuscator.obfuscate(testFrame, obfsBuf, 0)
+
+		frame := new(Frame)
 		b.ResetTimer()
 		b.SetBytes(int64(n))
 		for i := 0; i < b.N; i++ {
-			deobfs(obfsBuf[:n])
+			obfuscator.deobfuscate(frame, obfsBuf[:n])
 		}
 	})
 }

internal/multiplex/recvBuffer.go

@@ -14,15 +14,11 @@ type recvBuffer interface {
 	// Instead, it should behave as if it hasn't been closed. Closure is only relevant
 	// when the buffer is empty.
 	io.ReadCloser
-	io.WriterTo
+	Write(*Frame) (toBeClosed bool, err error)
-	Write(Frame) (toBeClosed bool, err error)
 	SetReadDeadline(time time.Time)
-	// SetWriteToTimeout sets the duration a recvBuffer waits in a WriteTo call when nothing
-	// has been written for a while. After that duration it should return ErrTimeout
-	SetWriteToTimeout(d time.Duration)
 }
 
 // size we want the amount of unread data in buffer to grow before recvBuffer.Write blocks.
 // If the buffer grows larger than what the system's memory can offer at the time of recvBuffer.Write,
 // a panic will happen.
-const recvBufferSizeLimit = defaultSendRecvBufSize << 12
+const recvBufferSizeLimit = 1<<31 - 1

internal/multiplex/session.go

@@ -3,20 +3,20 @@ package multiplex
 import (
 	"errors"
 	"fmt"
-	"github.com/cbeuw/Cloak/internal/common"
 	"net"
 	"sync"
 	"sync/atomic"
 	"time"
 
+	"github.com/cbeuw/Cloak/internal/common"
+
 	log "github.com/sirupsen/logrus"
 )
 
 const (
-	acceptBacklog = 1024
+	acceptBacklog            = 1024
-	// TODO: will this be a signature?
-	defaultSendRecvBufSize   = 20480
 	defaultInactivityTimeout = 30 * time.Second
+	defaultMaxOnWireSize     = 1<<14 + 256 // https://tools.ietf.org/html/rfc8446#section-5.2
 )
 
 var ErrBrokenSession = errors.New("broken session")
@@ -24,30 +24,27 @@ var errRepeatSessionClosing = errors.New("trying to close a closed session")
 var errRepeatStreamClosing = errors.New("trying to close a closed stream")
 var errNoMultiplex = errors.New("a singleplexing session can have only one stream")
 
-type switchboardStrategy int
-
 type SessionConfig struct {
 	Obfuscator
 
+	// Valve is used to limit transmission rates, and record and limit usage
 	Valve
 
 	Unordered bool
 
+	// A Singleplexing session always has just one stream
 	Singleplex bool
 
 	// maximum size of an obfuscated frame, including headers and overhead
 	MsgOnWireSizeLimit int
 
-	// StreamSendBufferSize sets the buffer size used to send data from a Stream (Stream.obfsBuf)
-	StreamSendBufferSize int
-	// ConnReceiveBufferSize sets the buffer size used to receive data from an underlying Conn (allocated in
-	// switchboard.deplex)
-	ConnReceiveBufferSize int
-
 	// InactivityTimeout sets the duration a Session waits while it has no active streams before it closes itself
 	InactivityTimeout time.Duration
 }
 
+// A Session represents a self-contained communication chain between local and remote. It manages its streams,
+// controls serialisation and encryption of data sent and received using the supplied Obfuscator, and send and receive
+// data through a manged connection pool filled with underlying connections added to it.
 type Session struct {
 	id uint32
 
@@ -58,7 +55,16 @@ type Session struct {
 
 	// atomic
 	activeStreamCount uint32
-	streams           sync.Map
+
+	streamsM sync.Mutex
+	streams  map[uint32]*Stream
+	// For accepting new streams
+	acceptCh chan *Stream
+
+	// a pool of heap allocated frame objects so we don't have to allocate a new one each time we receive a frame
+	recvFramePool sync.Pool
+
+	streamObfsBufPool sync.Pool
 
 	// Switchboard manages all connections to remote
 	sb *switchboard
@@ -66,16 +72,19 @@ type Session struct {
 	// Used for LocalAddr() and RemoteAddr() etc.
 	addrs atomic.Value
 
-	// For accepting new streams
-	acceptCh chan *Stream
-
 	closed uint32
 
-	terminalMsg atomic.Value
+	terminalMsgSetter sync.Once
+	terminalMsg       string
 
 	// the max size passed to Write calls before it splits it into multiple frames
 	// i.e. the max size a piece of data can fit into a Frame.Payload
 	maxStreamUnitWrite int
+	// streamSendBufferSize sets the buffer size used to send data from a Stream (Stream.obfsBuf)
+	streamSendBufferSize int
+	// connReceiveBufferSize sets the buffer size used to receive data from an underlying Conn (allocated in
+	// switchboard.deplex)
+	connReceiveBufferSize int
 }
 
 func MakeSession(id uint32, config SessionConfig) *Session {
@@ -84,32 +93,39 @@ func MakeSession(id uint32, config SessionConfig) *Session {
 		SessionConfig: config,
 		nextStreamID:  1,
 		acceptCh:      make(chan *Stream, acceptBacklog),
+		recvFramePool: sync.Pool{New: func() interface{} { return &Frame{} }},
+		streams:       map[uint32]*Stream{},
 	}
 	sesh.addrs.Store([]net.Addr{nil, nil})
 
 	if config.Valve == nil {
 		sesh.Valve = UNLIMITED_VALVE
 	}
-	if config.StreamSendBufferSize <= 0 {
-		sesh.StreamSendBufferSize = defaultSendRecvBufSize
-	}
-	if config.ConnReceiveBufferSize <= 0 {
-		sesh.ConnReceiveBufferSize = defaultSendRecvBufSize
-	}
 	if config.MsgOnWireSizeLimit <= 0 {
-		sesh.MsgOnWireSizeLimit = defaultSendRecvBufSize - 1024
+		sesh.MsgOnWireSizeLimit = defaultMaxOnWireSize
 	}
 	if config.InactivityTimeout == 0 {
 		sesh.InactivityTimeout = defaultInactivityTimeout
 	}
-	// todo: validation. this must be smaller than StreamSendBufferSize
+
-	sesh.maxStreamUnitWrite = sesh.MsgOnWireSizeLimit - HEADER_LEN - sesh.Obfuscator.maxOverhead
+	sesh.maxStreamUnitWrite = sesh.MsgOnWireSizeLimit - frameHeaderLength - maxExtraLen
+	sesh.streamSendBufferSize = sesh.MsgOnWireSizeLimit
+	sesh.connReceiveBufferSize = 20480 // for backwards compatibility
+
+	sesh.streamObfsBufPool = sync.Pool{New: func() interface{} {
+		b := make([]byte, sesh.streamSendBufferSize)
+		return &b
+	}}
 
 	sesh.sb = makeSwitchboard(sesh)
-	go sesh.timeoutAfter(sesh.InactivityTimeout)
+	time.AfterFunc(sesh.InactivityTimeout, sesh.checkTimeout)
 	return sesh
 }
 
+func (sesh *Session) GetSessionKey() [32]byte {
+	return sesh.sessionKey
+}
+
 func (sesh *Session) streamCountIncr() uint32 {
 	return atomic.AddUint32(&sesh.activeStreamCount, 1)
 }
@@ -120,12 +136,14 @@ func (sesh *Session) streamCount() uint32 {
 	return atomic.LoadUint32(&sesh.activeStreamCount)
 }
 
+// AddConnection is used to add an underlying connection to the connection pool
 func (sesh *Session) AddConnection(conn net.Conn) {
 	sesh.sb.addConn(conn)
 	addrs := []net.Addr{conn.LocalAddr(), conn.RemoteAddr()}
 	sesh.addrs.Store(addrs)
 }
 
+// OpenStream is similar to net.Dial. It opens up a new stream
 func (sesh *Session) OpenStream() (*Stream, error) {
 	if sesh.IsClosed() {
 		return nil, ErrBrokenSession
@@ -138,12 +156,15 @@ func (sesh *Session) OpenStream() (*Stream, error) {
 		return nil, errNoMultiplex
 	}
 	stream := makeStream(sesh, id)
-	sesh.streams.Store(id, stream)
+	sesh.streamsM.Lock()
+	sesh.streams[id] = stream
+	sesh.streamsM.Unlock()
 	sesh.streamCountIncr()
 	log.Tracef("stream %v of session %v opened", id, sesh.id)
 	return stream, nil
 }
 
+// Accept is similar to net.Listener's Accept(). It blocks and returns an incoming stream
 func (sesh *Session) Accept() (net.Conn, error) {
 	if sesh.IsClosed() {
 		return nil, ErrBrokenSession
@@ -157,44 +178,46 @@ func (sesh *Session) Accept() (net.Conn, error) {
 }
 
 func (sesh *Session) closeStream(s *Stream, active bool) error {
-	if atomic.SwapUint32(&s.closed, 1) == 1 {
+	if !atomic.CompareAndSwapUint32(&s.closed, 0, 1) {
 		return fmt.Errorf("closing stream %v: %w", s.id, errRepeatStreamClosing)
 	}
 	_ = s.recvBuf.Close() // recvBuf.Close should not return error
 
 	if active {
-		// Notify remote that this stream is closed
+		tmpBuf := sesh.streamObfsBufPool.Get().(*[]byte)
-		padding := genRandomPadding()
-		f := &Frame{
-			StreamID: s.id,
-			Seq:      s.nextSendSeq,
-			Closing:  C_STREAM,
-			Payload:  padding,
-		}
-		s.nextSendSeq++
 
-		obfsBuf := make([]byte, len(padding)+HEADER_LEN+sesh.Obfuscator.maxOverhead)
+		// Notify remote that this stream is closed
-		i, err := sesh.Obfs(f, obfsBuf, 0)
+		common.CryptoRandRead((*tmpBuf)[:1])
+		padLen := int((*tmpBuf)[0]) + 1
+		payload := (*tmpBuf)[frameHeaderLength : padLen+frameHeaderLength]
+		common.CryptoRandRead(payload)
+
+		// must be holding s.wirtingM on entry
+		s.writingFrame.Closing = closingStream
+		s.writingFrame.Payload = payload
+
+		err := s.obfuscateAndSend(*tmpBuf, frameHeaderLength)
+		sesh.streamObfsBufPool.Put(tmpBuf)
 		if err != nil {
 			return err
 		}
-		_, err = sesh.sb.send(obfsBuf[:i], &s.assignedConnId)
+		log.Tracef("stream %v actively closed.", s.id)
-		if err != nil {
-			return err
-		}
-		log.Tracef("stream %v actively closed. seq %v", s.id, f.Seq)
 	} else {
 		log.Tracef("stream %v passively closed", s.id)
 	}
 
-	// id may or may not exist as this is user input, if we use Delete(s.id) here it will panic
+	// We set it as nil to signify that the stream id had existed before.
-	sesh.streams.Store(s.id, nil)
+	// If we Delete(s.id) straight away, later on in recvDataFromRemote, it will not be able to tell
+	// if the frame it received was from a new stream or a dying stream whose frame arrived late
+	sesh.streamsM.Lock()
+	sesh.streams[s.id] = nil
+	sesh.streamsM.Unlock()
 	if sesh.streamCountDecr() == 0 {
 		if sesh.Singleplex {
 			return sesh.Close()
 		} else {
 			log.Debugf("session %v has no active stream left", sesh.id)
-			go sesh.timeoutAfter(sesh.InactivityTimeout)
+			time.AfterFunc(sesh.InactivityTimeout, sesh.checkTimeout)
 		}
 	}
 	return nil
@@ -204,117 +227,112 @@ func (sesh *Session) closeStream(s *Stream, active bool) error {
 // to the stream buffer, otherwise it fetches the desired stream instance, or creates and stores one if it's a new
 // stream and then writes to the stream buffer
 func (sesh *Session) recvDataFromRemote(data []byte) error {
-	frame, err := sesh.Deobfs(data)
+	frame := sesh.recvFramePool.Get().(*Frame)
+	defer sesh.recvFramePool.Put(frame)
+
+	err := sesh.deobfuscate(frame, data)
 	if err != nil {
 		return fmt.Errorf("Failed to decrypt a frame for session %v: %v", sesh.id, err)
 	}
 
-	if frame.Closing == C_SESSION {
+	if frame.Closing == closingSession {
 		sesh.SetTerminalMsg("Received a closing notification frame")
 		return sesh.passiveClose()
 	}
 
-	newStream := makeStream(sesh, frame.StreamID)
+	sesh.streamsM.Lock()
-	existingStreamI, existing := sesh.streams.LoadOrStore(frame.StreamID, newStream)
+	if sesh.IsClosed() {
+		sesh.streamsM.Unlock()
+		return ErrBrokenSession
+	}
+	existingStream, existing := sesh.streams[frame.StreamID]
 	if existing {
-		if existingStreamI == nil {
+		sesh.streamsM.Unlock()
+		if existingStream == nil {
 			// this is when the stream existed before but has since been closed. We do nothing
 			return nil
 		}
-		return existingStreamI.(*Stream).recvFrame(*frame)
+		return existingStream.recvFrame(frame)
 	} else {
+		newStream := makeStream(sesh, frame.StreamID)
+		sesh.streams[frame.StreamID] = newStream
+		sesh.acceptCh <- newStream
+		sesh.streamsM.Unlock()
 		// new stream
 		sesh.streamCountIncr()
-		sesh.acceptCh <- newStream
+		return newStream.recvFrame(frame)
-		return newStream.recvFrame(*frame)
 	}
 }
 
 func (sesh *Session) SetTerminalMsg(msg string) {
-	sesh.terminalMsg.Store(msg)
+	log.Debug("terminal message set to " + msg)
+	sesh.terminalMsgSetter.Do(func() {
+		sesh.terminalMsg = msg
+	})
 }
 
 func (sesh *Session) TerminalMsg() string {
-	msg := sesh.terminalMsg.Load()
+	return sesh.terminalMsg
-	if msg != nil {
+}
-		return msg.(string)
+
-	} else {
+func (sesh *Session) closeSession() error {
-		return ""
+	if !atomic.CompareAndSwapUint32(&sesh.closed, 0, 1) {
+		log.Debugf("session %v has already been closed", sesh.id)
+		return errRepeatSessionClosing
 	}
+
+	sesh.streamsM.Lock()
+	close(sesh.acceptCh)
+	for id, stream := range sesh.streams {
+		if stream != nil && atomic.CompareAndSwapUint32(&stream.closed, 0, 1) {
+			_ = stream.recvBuf.Close() // will not block
+			delete(sesh.streams, id)
+			sesh.streamCountDecr()
+		}
+	}
+	sesh.streamsM.Unlock()
+	return nil
 }
 
 func (sesh *Session) passiveClose() error {
 	log.Debugf("attempting to passively close session %v", sesh.id)
-	if atomic.SwapUint32(&sesh.closed, 1) == 1 {
+	err := sesh.closeSession()
-		log.Debugf("session %v has already been closed", sesh.id)
+	if err != nil {
-		return errRepeatSessionClosing
+		return err
 	}
-	sesh.acceptCh <- nil
-
-	sesh.streams.Range(func(key, streamI interface{}) bool {
-		if streamI == nil {
-			return true
-		}
-		stream := streamI.(*Stream)
-		atomic.StoreUint32(&stream.closed, 1)
-		_ = stream.recvBuf.Close() // will not block
-		sesh.streams.Delete(key)
-		sesh.streamCountDecr()
-		return true
-	})
-
 	sesh.sb.closeAll()
 	log.Debugf("session %v closed gracefully", sesh.id)
 	return nil
 }
 
-func genRandomPadding() []byte {
-	lenB := make([]byte, 1)
-	common.CryptoRandRead(lenB)
-	pad := make([]byte, lenB[0]+1)
-	common.CryptoRandRead(pad)
-	return pad
-}
-
 func (sesh *Session) Close() error {
 	log.Debugf("attempting to actively close session %v", sesh.id)
-	if atomic.SwapUint32(&sesh.closed, 1) == 1 {
+	err := sesh.closeSession()
-		log.Debugf("session %v has already been closed", sesh.id)
+	if err != nil {
-		return errRepeatSessionClosing
+		return err
 	}
-	sesh.acceptCh <- nil
-
-	// close all streams
-	sesh.streams.Range(func(key, streamI interface{}) bool {
-		if streamI == nil {
-			return true
-		}
-		stream := streamI.(*Stream)
-		atomic.StoreUint32(&stream.closed, 1)
-		_ = stream.recvBuf.Close() // will not block
-		sesh.streams.Delete(key)
-		sesh.streamCountDecr()
-		return true
-	})
-
 	// we send a notice frame telling remote to close the session
-	pad := genRandomPadding()
+
+	buf := sesh.streamObfsBufPool.Get().(*[]byte)
+	common.CryptoRandRead((*buf)[:1])
+	padLen := int((*buf)[0]) + 1
+	payload := (*buf)[frameHeaderLength : padLen+frameHeaderLength]
+	common.CryptoRandRead(payload)
+
 	f := &Frame{
 		StreamID: 0xffffffff,
 		Seq:      0,
-		Closing:  C_SESSION,
+		Closing:  closingSession,
-		Payload:  pad,
+		Payload:  payload,
 	}
-	obfsBuf := make([]byte, len(pad)+HEADER_LEN+sesh.Obfuscator.maxOverhead)
+	i, err := sesh.obfuscate(f, *buf, frameHeaderLength)
-	i, err := sesh.Obfs(f, obfsBuf, 0)
 	if err != nil {
 		return err
 	}
-	_, err = sesh.sb.send(obfsBuf[:i], new(uint32))
+	_, err = sesh.sb.send((*buf)[:i], new(net.Conn))
 	if err != nil {
 		return err
 	}
-
 	sesh.sb.closeAll()
 	log.Debugf("session %v closed gracefully", sesh.id)
 	return nil
@@ -324,9 +342,7 @@ func (sesh *Session) IsClosed() bool {
 	return atomic.LoadUint32(&sesh.closed) == 1
 }
 
-func (sesh *Session) timeoutAfter(to time.Duration) {
+func (sesh *Session) checkTimeout() {
-	time.Sleep(to)
-
 	if sesh.streamCount() == 0 && !sesh.IsClosed() {
 		sesh.SetTerminalMsg("timeout")
 		sesh.Close()

internal/multiplex/session_fuzz.go

@@ -1,9 +1,10 @@
+//go:build gofuzz
 // +build gofuzz
 
 package multiplex
 
 func setupSesh_fuzz(unordered bool) *Session {
-	obfuscator, _ := MakeObfuscator(E_METHOD_PLAIN, [32]byte{})
+	obfuscator, _ := MakeObfuscator(EncryptionMethodPlain, [32]byte{})
 
 	seshConfig := SessionConfig{
 		Obfuscator: obfuscator,

internal/multiplex/session_test.go

@@ -2,171 +2,237 @@ package multiplex
 
 import (
 	"bytes"
-	"github.com/cbeuw/connutil"
+	"io"
+	"io/ioutil"
 	"math/rand"
+	"net"
 	"strconv"
 	"sync"
 	"sync/atomic"
 	"testing"
 	"time"
+
+	"github.com/cbeuw/connutil"
+	"github.com/stretchr/testify/assert"
 )
 
-var seshConfigOrdered = SessionConfig{}
+var seshConfigs = map[string]SessionConfig{
-
+	"ordered":   {},
-var seshConfigUnordered = SessionConfig{
+	"unordered": {Unordered: true},
-	Unordered: true,
+}
+var encryptionMethods = map[string]byte{
+	"plain":            EncryptionMethodPlain,
+	"aes-256-gcm":      EncryptionMethodAES256GCM,
+	"aes-128-gcm":      EncryptionMethodAES128GCM,
+	"chacha20poly1305": EncryptionMethodChaha20Poly1305,
 }
 
-func TestRecvDataFromRemote(t *testing.T) {
+const testPayloadLen = 1024
-	testPayloadLen := 1024
+const obfsBufLen = testPayloadLen * 2
-	testPayload := make([]byte, testPayloadLen)
-	rand.Read(testPayload)
-	f := &Frame{
-		1,
-		0,
-		0,
-		testPayload,
-	}
-	obfsBuf := make([]byte, 17000)
 
+func TestRecvDataFromRemote(t *testing.T) {
 	var sessionKey [32]byte
 	rand.Read(sessionKey[:])
-	t.Run("plain ordered", func(t *testing.T) {
-		obfuscator, _ := MakeObfuscator(E_METHOD_PLAIN, sessionKey)
-		seshConfigOrdered.Obfuscator = obfuscator
-		sesh := MakeSession(0, seshConfigOrdered)
-		n, _ := sesh.Obfs(f, obfsBuf, 0)
 
-		err := sesh.recvDataFromRemote(obfsBuf[:n])
+	for seshType, seshConfig := range seshConfigs {
-		if err != nil {
+		seshConfig := seshConfig
-			t.Error(err)
+		t.Run(seshType, func(t *testing.T) {
-			return
+			var err error
-		}
+			seshConfig.Obfuscator, err = MakeObfuscator(EncryptionMethodPlain, sessionKey)
-		stream, err := sesh.Accept()
+			if err != nil {
-		if err != nil {
+				t.Fatalf("failed to make obfuscator: %v", err)
-			t.Error(err)
+			}
-			return
+			t.Run("initial frame", func(t *testing.T) {
-		}
+				sesh := MakeSession(0, seshConfig)
+				obfsBuf := make([]byte, obfsBufLen)
+				f := Frame{
+					1,
+					0,
+					0,
+					make([]byte, testPayloadLen),
+				}
+				rand.Read(f.Payload)
+				n, err := sesh.obfuscate(&f, obfsBuf, 0)
+				assert.NoError(t, err)
+				err = sesh.recvDataFromRemote(obfsBuf[:n])
+				assert.NoError(t, err)
+				stream, err := sesh.Accept()
+				assert.NoError(t, err)
 
-		resultPayload := make([]byte, testPayloadLen)
+				resultPayload := make([]byte, testPayloadLen)
-		_, err = stream.Read(resultPayload)
+				_, err = stream.Read(resultPayload)
-		if err != nil {
+				assert.NoError(t, err)
-			t.Error(err)
-			return
-		}
-		if !bytes.Equal(testPayload, resultPayload) {
-			t.Errorf("Expecting %x, got %x", testPayload, resultPayload)
-		}
-	})
-	t.Run("aes-gcm ordered", func(t *testing.T) {
-		obfuscator, _ := MakeObfuscator(E_METHOD_AES_GCM, sessionKey)
-		seshConfigOrdered.Obfuscator = obfuscator
-		sesh := MakeSession(0, seshConfigOrdered)
-		n, _ := sesh.Obfs(f, obfsBuf, 0)
 
-		err := sesh.recvDataFromRemote(obfsBuf[:n])
+				assert.EqualValues(t, f.Payload, resultPayload)
-		if err != nil {
+			})
-			t.Error(err)
-			return
-		}
-		stream, err := sesh.Accept()
-		if err != nil {
-			t.Error(err)
-			return
-		}
 
-		resultPayload := make([]byte, testPayloadLen)
+			t.Run("two frames in order", func(t *testing.T) {
-		_, err = stream.Read(resultPayload)
+				sesh := MakeSession(0, seshConfig)
-		if err != nil {
+				obfsBuf := make([]byte, obfsBufLen)
-			t.Error(err)
+				f := Frame{
-			return
+					1,
-		}
+					0,
-		if !bytes.Equal(testPayload, resultPayload) {
+					0,
-			t.Errorf("Expecting %x, got %x", testPayload, resultPayload)
+					make([]byte, testPayloadLen),
-		}
+				}
-	})
+				rand.Read(f.Payload)
-	t.Run("chacha20-poly1305 ordered", func(t *testing.T) {
+				n, err := sesh.obfuscate(&f, obfsBuf, 0)
-		obfuscator, _ := MakeObfuscator(E_METHOD_CHACHA20_POLY1305, sessionKey)
+				assert.NoError(t, err)
-		seshConfigOrdered.Obfuscator = obfuscator
+				err = sesh.recvDataFromRemote(obfsBuf[:n])
-		sesh := MakeSession(0, seshConfigOrdered)
+				assert.NoError(t, err)
-		n, _ := sesh.Obfs(f, obfsBuf, 0)
+				stream, err := sesh.Accept()
+				assert.NoError(t, err)
 
-		err := sesh.recvDataFromRemote(obfsBuf[:n])
+				resultPayload := make([]byte, testPayloadLen)
-		if err != nil {
+				_, err = io.ReadFull(stream, resultPayload)
-			t.Error(err)
+				assert.NoError(t, err)
-			return
-		}
-		stream, err := sesh.Accept()
-		if err != nil {
-			t.Error(err)
-			return
-		}
 
-		resultPayload := make([]byte, testPayloadLen)
+				assert.EqualValues(t, f.Payload, resultPayload)
-		_, err = stream.Read(resultPayload)
-		if err != nil {
-			t.Error(err)
-			return
-		}
-		if !bytes.Equal(testPayload, resultPayload) {
-			t.Errorf("Expecting %x, got %x", testPayload, resultPayload)
-		}
-	})
 
-	t.Run("plain unordered", func(t *testing.T) {
+				f.Seq += 1
-		obfuscator, _ := MakeObfuscator(E_METHOD_PLAIN, sessionKey)
+				rand.Read(f.Payload)
-		seshConfigUnordered.Obfuscator = obfuscator
+				n, err = sesh.obfuscate(&f, obfsBuf, 0)
-		sesh := MakeSession(0, seshConfigOrdered)
+				assert.NoError(t, err)
-		n, _ := sesh.Obfs(f, obfsBuf, 0)
+				err = sesh.recvDataFromRemote(obfsBuf[:n])
+				assert.NoError(t, err)
 
-		err := sesh.recvDataFromRemote(obfsBuf[:n])
+				_, err = io.ReadFull(stream, resultPayload)
-		if err != nil {
+				assert.NoError(t, err)
-			t.Error(err)
-			return
-		}
-		stream, err := sesh.Accept()
-		if err != nil {
-			t.Error(err)
-			return
-		}
 
-		resultPayload := make([]byte, testPayloadLen)
+				assert.EqualValues(t, f.Payload, resultPayload)
-		_, err = stream.Read(resultPayload)
+			})
-		if err != nil {
+
-			t.Error(err)
+			t.Run("two frames in order", func(t *testing.T) {
-			return
+				sesh := MakeSession(0, seshConfig)
-		}
+				obfsBuf := make([]byte, obfsBufLen)
-		if !bytes.Equal(testPayload, resultPayload) {
+				f := Frame{
-			t.Errorf("Expecting %x, got %x", testPayload, resultPayload)
+					1,
-		}
+					0,
-	})
+					0,
+					make([]byte, testPayloadLen),
+				}
+				rand.Read(f.Payload)
+				n, err := sesh.obfuscate(&f, obfsBuf, 0)
+				assert.NoError(t, err)
+				err = sesh.recvDataFromRemote(obfsBuf[:n])
+				assert.NoError(t, err)
+				stream, err := sesh.Accept()
+				assert.NoError(t, err)
+
+				resultPayload := make([]byte, testPayloadLen)
+				_, err = io.ReadFull(stream, resultPayload)
+				assert.NoError(t, err)
+
+				assert.EqualValues(t, f.Payload, resultPayload)
+
+				f.Seq += 1
+				rand.Read(f.Payload)
+				n, err = sesh.obfuscate(&f, obfsBuf, 0)
+				assert.NoError(t, err)
+				err = sesh.recvDataFromRemote(obfsBuf[:n])
+				assert.NoError(t, err)
+
+				_, err = io.ReadFull(stream, resultPayload)
+				assert.NoError(t, err)
+
+				assert.EqualValues(t, f.Payload, resultPayload)
+			})
+
+			if seshType == "ordered" {
+				t.Run("frames out of order", func(t *testing.T) {
+					sesh := MakeSession(0, seshConfig)
+					obfsBuf := make([]byte, obfsBufLen)
+					f := Frame{
+						1,
+						0,
+						0,
+						nil,
+					}
+
+					// First frame
+					seq0 := make([]byte, testPayloadLen)
+					rand.Read(seq0)
+					f.Seq = 0
+					f.Payload = seq0
+					n, err := sesh.obfuscate(&f, obfsBuf, 0)
+					assert.NoError(t, err)
+					err = sesh.recvDataFromRemote(obfsBuf[:n])
+					assert.NoError(t, err)
+
+					// Third frame
+					seq2 := make([]byte, testPayloadLen)
+					rand.Read(seq2)
+					f.Seq = 2
+					f.Payload = seq2
+					n, err = sesh.obfuscate(&f, obfsBuf, 0)
+					assert.NoError(t, err)
+					err = sesh.recvDataFromRemote(obfsBuf[:n])
+					assert.NoError(t, err)
+
+					// Second frame
+					seq1 := make([]byte, testPayloadLen)
+					rand.Read(seq1)
+					f.Seq = 1
+					f.Payload = seq1
+					n, err = sesh.obfuscate(&f, obfsBuf, 0)
+					assert.NoError(t, err)
+					err = sesh.recvDataFromRemote(obfsBuf[:n])
+					assert.NoError(t, err)
+
+					// Expect things to receive in order
+					stream, err := sesh.Accept()
+					assert.NoError(t, err)
+
+					resultPayload := make([]byte, testPayloadLen)
+
+					// First
+					_, err = io.ReadFull(stream, resultPayload)
+					assert.NoError(t, err)
+					assert.EqualValues(t, seq0, resultPayload)
+
+					// Second
+					_, err = io.ReadFull(stream, resultPayload)
+					assert.NoError(t, err)
+					assert.EqualValues(t, seq1, resultPayload)
+
+					// Third
+					_, err = io.ReadFull(stream, resultPayload)
+					assert.NoError(t, err)
+					assert.EqualValues(t, seq2, resultPayload)
+				})
+			}
+
+		})
+	}
 }
 
 func TestRecvDataFromRemote_Closing_InOrder(t *testing.T) {
-	testPayloadLen := 1024
 	testPayload := make([]byte, testPayloadLen)
 	rand.Read(testPayload)
-	obfsBuf := make([]byte, 17000)
+	obfsBuf := make([]byte, obfsBufLen)
 
 	var sessionKey [32]byte
 	rand.Read(sessionKey[:])
-	obfuscator, _ := MakeObfuscator(E_METHOD_PLAIN, sessionKey)
+
-	seshConfigOrdered.Obfuscator = obfuscator
+	seshConfig := seshConfigs["ordered"]
-	sesh := MakeSession(0, seshConfigOrdered)
+	seshConfig.Obfuscator, _ = MakeObfuscator(EncryptionMethodPlain, sessionKey)
+	sesh := MakeSession(0, seshConfig)
 
 	f1 := &Frame{
 		1,
 		0,
-		C_NOOP,
+		closingNothing,
 		testPayload,
 	}
 	// create stream 1
-	n, _ := sesh.Obfs(f1, obfsBuf, 0)
+	n, _ := sesh.obfuscate(f1, obfsBuf, 0)
 	err := sesh.recvDataFromRemote(obfsBuf[:n])
 	if err != nil {
 		t.Fatalf("receiving normal frame for stream 1: %v", err)
 	}
-	_, ok := sesh.streams.Load(f1.StreamID)
+	sesh.streamsM.Lock()
+	_, ok := sesh.streams[f1.StreamID]
+	sesh.streamsM.Unlock()
 	if !ok {
 		t.Fatal("failed to fetch stream 1 after receiving it")
 	}
@@ -178,16 +244,18 @@ func TestRecvDataFromRemote_Closing_InOrder(t *testing.T) {
 	f2 := &Frame{
 		2,
 		0,
-		C_NOOP,
+		closingNothing,
 		testPayload,
 	}
-	n, _ = sesh.Obfs(f2, obfsBuf, 0)
+	n, _ = sesh.obfuscate(f2, obfsBuf, 0)
 	err = sesh.recvDataFromRemote(obfsBuf[:n])
 	if err != nil {
 		t.Fatalf("receiving normal frame for stream 2: %v", err)
 	}
-	s2I, ok := sesh.streams.Load(f2.StreamID)
+	sesh.streamsM.Lock()
-	if s2I == nil || !ok {
+	s2M, ok := sesh.streams[f2.StreamID]
+	sesh.streamsM.Unlock()
+	if s2M == nil || !ok {
 		t.Fatal("failed to fetch stream 2 after receiving it")
 	}
 	if sesh.streamCount() != 2 {
@@ -198,16 +266,18 @@ func TestRecvDataFromRemote_Closing_InOrder(t *testing.T) {
 	f1CloseStream := &Frame{
 		1,
 		1,
-		C_STREAM,
+		closingStream,
 		testPayload,
 	}
-	n, _ = sesh.Obfs(f1CloseStream, obfsBuf, 0)
+	n, _ = sesh.obfuscate(f1CloseStream, obfsBuf, 0)
 	err = sesh.recvDataFromRemote(obfsBuf[:n])
 	if err != nil {
 		t.Fatalf("receiving stream closing frame for stream 1: %v", err)
 	}
-	s1I, _ := sesh.streams.Load(f1.StreamID)
+	sesh.streamsM.Lock()
-	if s1I != nil {
+	s1M, _ := sesh.streams[f1.StreamID]
+	sesh.streamsM.Unlock()
+	if s1M != nil {
 		t.Fatal("stream 1 still exist after receiving stream close")
 	}
 	s1, _ := sesh.Accept()
@@ -228,27 +298,30 @@ func TestRecvDataFromRemote_Closing_InOrder(t *testing.T) {
 	}
 
 	// close stream 1 again
-	n, _ = sesh.Obfs(f1CloseStream, obfsBuf, 0)
+	n, _ = sesh.obfuscate(f1CloseStream, obfsBuf, 0)
 	err = sesh.recvDataFromRemote(obfsBuf[:n])
 	if err != nil {
 		t.Fatalf("receiving stream closing frame for stream 1 %v", err)
 	}
-	s1I, _ = sesh.streams.Load(f1.StreamID)
+	sesh.streamsM.Lock()
-	if s1I != nil {
+	s1M, _ = sesh.streams[f1.StreamID]
+	sesh.streamsM.Unlock()
+	if s1M != nil {
 		t.Error("stream 1 exists after receiving stream close for the second time")
 	}
-	if sesh.streamCount() != 1 {
+	streamCount := sesh.streamCount()
-		t.Error("stream count isn't 1 after stream 1 closed twice")
+	if streamCount != 1 {
+		t.Errorf("stream count is %v after stream 1 closed twice, expected 1", streamCount)
 	}
 
 	// close session
 	fCloseSession := &Frame{
 		StreamID: 0xffffffff,
 		Seq:      0,
-		Closing:  C_SESSION,
+		Closing:  closingSession,
 		Payload:  testPayload,
 	}
-	n, _ = sesh.Obfs(fCloseSession, obfsBuf, 0)
+	n, _ = sesh.obfuscate(fCloseSession, obfsBuf, 0)
 	err = sesh.recvDataFromRemote(obfsBuf[:n])
 	if err != nil {
 		t.Fatalf("receiving session closing frame: %v", err)
@@ -272,30 +345,32 @@ func TestRecvDataFromRemote_Closing_InOrder(t *testing.T) {
 
 func TestRecvDataFromRemote_Closing_OutOfOrder(t *testing.T) {
 	// Tests for when the closing frame of a stream is received first before any data frame
-	testPayloadLen := 1024
 	testPayload := make([]byte, testPayloadLen)
 	rand.Read(testPayload)
-	obfsBuf := make([]byte, 17000)
+	obfsBuf := make([]byte, obfsBufLen)
 
 	var sessionKey [32]byte
 	rand.Read(sessionKey[:])
-	obfuscator, _ := MakeObfuscator(E_METHOD_PLAIN, sessionKey)
+
-	seshConfigOrdered.Obfuscator = obfuscator
+	seshConfig := seshConfigs["ordered"]
-	sesh := MakeSession(0, seshConfigOrdered)
+	seshConfig.Obfuscator, _ = MakeObfuscator(EncryptionMethodPlain, sessionKey)
+	sesh := MakeSession(0, seshConfig)
 
 	// receive stream 1 closing first
 	f1CloseStream := &Frame{
 		1,
 		1,
-		C_STREAM,
+		closingStream,
 		testPayload,
 	}
-	n, _ := sesh.Obfs(f1CloseStream, obfsBuf, 0)
+	n, _ := sesh.obfuscate(f1CloseStream, obfsBuf, 0)
 	err := sesh.recvDataFromRemote(obfsBuf[:n])
 	if err != nil {
 		t.Fatalf("receiving out of order stream closing frame for stream 1: %v", err)
 	}
-	_, ok := sesh.streams.Load(f1CloseStream.StreamID)
+	sesh.streamsM.Lock()
+	_, ok := sesh.streams[f1CloseStream.StreamID]
+	sesh.streamsM.Unlock()
 	if !ok {
 		t.Fatal("stream 1 doesn't exist")
 	}
@@ -307,10 +382,10 @@ func TestRecvDataFromRemote_Closing_OutOfOrder(t *testing.T) {
 	f1 := &Frame{
 		1,
 		0,
-		C_NOOP,
+		closingNothing,
 		testPayload,
 	}
-	n, _ = sesh.Obfs(f1, obfsBuf, 0)
+	n, _ = sesh.obfuscate(f1, obfsBuf, 0)
 	err = sesh.recvDataFromRemote(obfsBuf[:n])
 	if err != nil {
 		t.Fatalf("receiving normal frame for stream 1: %v", err)
@@ -334,173 +409,232 @@ func TestRecvDataFromRemote_Closing_OutOfOrder(t *testing.T) {
 func TestParallelStreams(t *testing.T) {
 	var sessionKey [32]byte
 	rand.Read(sessionKey[:])
-	obfuscator, _ := MakeObfuscator(E_METHOD_PLAIN, sessionKey)
+	obfuscator, _ := MakeObfuscator(EncryptionMethodPlain, sessionKey)
-	seshConfigOrdered.Obfuscator = obfuscator
-	sesh := MakeSession(0, seshConfigOrdered)
 
-	numStreams := acceptBacklog
+	for seshType, seshConfig := range seshConfigs {
-	seqs := make([]*uint64, numStreams)
+		seshConfig := seshConfig
-	for i := range seqs {
+		t.Run(seshType, func(t *testing.T) {
-		seqs[i] = new(uint64)
+			seshConfig.Obfuscator = obfuscator
-	}
+			sesh := MakeSession(0, seshConfig)
-	randFrame := func() *Frame {
-		id := rand.Intn(numStreams)
-		return &Frame{
-			uint32(id),
-			atomic.AddUint64(seqs[id], 1) - 1,
-			uint8(rand.Intn(2)),
-			[]byte{1, 2, 3, 4},
-		}
-	}
 
-	numOfTests := 5000
+			numStreams := acceptBacklog
-	tests := make([]struct {
+			seqs := make([]*uint64, numStreams)
-		name  string
+			for i := range seqs {
-		frame *Frame
+				seqs[i] = new(uint64)
-	}, numOfTests)
+			}
-	for i := range tests {
+			randFrame := func() *Frame {
-		tests[i].name = strconv.Itoa(i)
+				id := rand.Intn(numStreams)
-		tests[i].frame = randFrame()
+				return &Frame{
-	}
+					uint32(id),
-
+					atomic.AddUint64(seqs[id], 1) - 1,
-	var wg sync.WaitGroup
+					uint8(rand.Intn(2)),
-	for _, tc := range tests {
+					[]byte{1, 2, 3, 4},
-		wg.Add(1)
+				}
-		go func(frame *Frame) {
-			data := make([]byte, 1000)
-			n, _ := sesh.Obfs(frame, data, 0)
-			data = data[0:n]
-
-			err := sesh.recvDataFromRemote(data)
-			if err != nil {
-				t.Error(err)
 			}
-			wg.Done()
-		}(tc.frame)
-	}
 
-	wg.Wait()
+			const numOfTests = 5000
-	sc := int(sesh.streamCount())
+			tests := make([]struct {
-	var count int
+				name  string
-	sesh.streams.Range(func(_, s interface{}) bool {
+				frame *Frame
-		if s != nil {
+			}, numOfTests)
-			count++
+			for i := range tests {
-		}
+				tests[i].name = strconv.Itoa(i)
-		return true
+				tests[i].frame = randFrame()
-	})
+			}
-	if sc != count {
+
-		t.Errorf("broken referential integrety: actual %v, reference count: %v", count, sc)
+			var wg sync.WaitGroup
+			for _, tc := range tests {
+				wg.Add(1)
+				go func(frame *Frame) {
+					obfsBuf := make([]byte, obfsBufLen)
+					n, _ := sesh.obfuscate(frame, obfsBuf, 0)
+					obfsBuf = obfsBuf[0:n]
+
+					err := sesh.recvDataFromRemote(obfsBuf)
+					if err != nil {
+						t.Error(err)
+					}
+					wg.Done()
+				}(tc.frame)
+			}
+
+			wg.Wait()
+			sc := int(sesh.streamCount())
+			var count int
+			sesh.streamsM.Lock()
+			for _, s := range sesh.streams {
+				if s != nil {
+					count++
+				}
+			}
+			sesh.streamsM.Unlock()
+			if sc != count {
+				t.Errorf("broken referential integrety: actual %v, reference count: %v", count, sc)
+			}
+		})
 	}
 }
 
 func TestStream_SetReadDeadline(t *testing.T) {
-	var sessionKey [32]byte
+	for seshType, seshConfig := range seshConfigs {
-	rand.Read(sessionKey[:])
+		seshConfig := seshConfig
-	obfuscator, _ := MakeObfuscator(E_METHOD_PLAIN, sessionKey)
+		t.Run(seshType, func(t *testing.T) {
-	seshConfigOrdered.Obfuscator = obfuscator
+			sesh := MakeSession(0, seshConfig)
+			sesh.AddConnection(connutil.Discard())
 
-	testReadDeadline := func(sesh *Session) {
+			t.Run("read after deadline set", func(t *testing.T) {
-		t.Run("read after deadline set", func(t *testing.T) {
+				stream, _ := sesh.OpenStream()
-			stream, _ := sesh.OpenStream()
+				_ = stream.SetReadDeadline(time.Now().Add(-1 * time.Second))
-			_ = stream.SetReadDeadline(time.Now().Add(-1 * time.Second))
+				_, err := stream.Read(make([]byte, 1))
-			_, err := stream.Read(make([]byte, 1))
+				if err != ErrTimeout {
-			if err != ErrTimeout {
+					t.Errorf("expecting error %v, got %v", ErrTimeout, err)
-				t.Errorf("expecting error %v, got %v", ErrTimeout, err)
+				}
-			}
+			})
-		})
 
-		t.Run("unblock when deadline passed", func(t *testing.T) {
+			t.Run("unblock when deadline passed", func(t *testing.T) {
-			stream, _ := sesh.OpenStream()
+				stream, _ := sesh.OpenStream()
 
-			done := make(chan struct{})
+				done := make(chan struct{})
-			go func() {
+				go func() {
-				_, _ = stream.Read(make([]byte, 1))
+					_, _ = stream.Read(make([]byte, 1))
-				done <- struct{}{}
+					done <- struct{}{}
-			}()
+				}()
 
-			_ = stream.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
+				_ = stream.SetReadDeadline(time.Now().Add(100 * time.Millisecond))
 
-			select {
+				select {
-			case <-done:
+				case <-done:
-				return
+					return
-			case <-time.After(500 * time.Millisecond):
+				case <-time.After(500 * time.Millisecond):
-				t.Error("Read did not unblock after deadline has passed")
+					t.Error("Read did not unblock after deadline has passed")
-			}
+				}
+			})
 		})
 	}
-
-	sesh := MakeSession(0, seshConfigOrdered)
-	sesh.AddConnection(connutil.Discard())
-	testReadDeadline(sesh)
-	sesh = MakeSession(0, seshConfigUnordered)
-	sesh.AddConnection(connutil.Discard())
-	testReadDeadline(sesh)
 }
 
 func TestSession_timeoutAfter(t *testing.T) {
 	var sessionKey [32]byte
 	rand.Read(sessionKey[:])
-	obfuscator, _ := MakeObfuscator(E_METHOD_PLAIN, sessionKey)
+	obfuscator, _ := MakeObfuscator(EncryptionMethodPlain, sessionKey)
-	seshConfigOrdered.Obfuscator = obfuscator
+
-	seshConfigOrdered.InactivityTimeout = 100 * time.Millisecond
+	for seshType, seshConfig := range seshConfigs {
-	sesh := MakeSession(0, seshConfigOrdered)
+		seshConfig := seshConfig
-	time.Sleep(200 * time.Millisecond)
+		t.Run(seshType, func(t *testing.T) {
-	if !sesh.IsClosed() {
+			seshConfig.Obfuscator = obfuscator
-		t.Error("session should have timed out")
+			seshConfig.InactivityTimeout = 100 * time.Millisecond
+			sesh := MakeSession(0, seshConfig)
+
+			assert.Eventually(t, func() bool {
+				return sesh.IsClosed()
+			}, 5*seshConfig.InactivityTimeout, seshConfig.InactivityTimeout, "session should have timed out")
+		})
 	}
 }
 
-func BenchmarkRecvDataFromRemote_Ordered(b *testing.B) {
+func BenchmarkRecvDataFromRemote(b *testing.B) {
-	testPayloadLen := 1024
 	testPayload := make([]byte, testPayloadLen)
 	rand.Read(testPayload)
-	f := &Frame{
+	f := Frame{
 		1,
 		0,
 		0,
 		testPayload,
 	}
-	obfsBuf := make([]byte, 17000)
 
 	var sessionKey [32]byte
 	rand.Read(sessionKey[:])
 
-	b.Run("plain", func(b *testing.B) {
+	const maxIter = 500_000 // run with -benchtime 500000x to avoid index out of bounds panic
-		obfuscator, _ := MakeObfuscator(E_METHOD_PLAIN, sessionKey)
+	for name, ep := range encryptionMethods {
-		seshConfigOrdered.Obfuscator = obfuscator
+		ep := ep
-		sesh := MakeSession(0, seshConfigOrdered)
+		b.Run(name, func(b *testing.B) {
-		n, _ := sesh.Obfs(f, obfsBuf, 0)
+			for seshType, seshConfig := range seshConfigs {
+				b.Run(seshType, func(b *testing.B) {
+					f := f
+					seshConfig.Obfuscator, _ = MakeObfuscator(ep, sessionKey)
+					sesh := MakeSession(0, seshConfig)
 
-		b.SetBytes(int64(len(f.Payload)))
+					go func() {
-		b.ResetTimer()
+						stream, _ := sesh.Accept()
-		for i := 0; i < b.N; i++ {
+						io.Copy(ioutil.Discard, stream)
-			sesh.recvDataFromRemote(obfsBuf[:n])
+					}()
-		}
-	})
 
-	b.Run("aes-gcm", func(b *testing.B) {
+					binaryFrames := [maxIter][]byte{}
-		obfuscator, _ := MakeObfuscator(E_METHOD_AES_GCM, sessionKey)
+					for i := 0; i < maxIter; i++ {
-		seshConfigOrdered.Obfuscator = obfuscator
+						obfsBuf := make([]byte, obfsBufLen)
-		sesh := MakeSession(0, seshConfigOrdered)
+						n, _ := sesh.obfuscate(&f, obfsBuf, 0)
-		n, _ := sesh.Obfs(f, obfsBuf, 0)
+						binaryFrames[i] = obfsBuf[:n]
+						f.Seq++
+					}
 
-		b.SetBytes(int64(len(f.Payload)))
+					b.SetBytes(int64(len(f.Payload)))
-		b.ResetTimer()
+					b.ResetTimer()
-		for i := 0; i < b.N; i++ {
+					for i := 0; i < b.N; i++ {
-			sesh.recvDataFromRemote(obfsBuf[:n])
+						sesh.recvDataFromRemote(binaryFrames[i])
-		}
+					}
-	})
+				})
-
+			}
-	b.Run("chacha20-poly1305", func(b *testing.B) {
+		})
-		obfuscator, _ := MakeObfuscator(E_METHOD_CHACHA20_POLY1305, sessionKey)
+	}
-		seshConfigOrdered.Obfuscator = obfuscator
+}
-		sesh := MakeSession(0, seshConfigOrdered)
+
-		n, _ := sesh.Obfs(f, obfsBuf, 0)
+func BenchmarkMultiStreamWrite(b *testing.B) {
-
+	var sessionKey [32]byte
-		b.SetBytes(int64(len(f.Payload)))
+	rand.Read(sessionKey[:])
-		b.ResetTimer()
+
-		for i := 0; i < b.N; i++ {
+	testPayload := make([]byte, testPayloadLen)
-			sesh.recvDataFromRemote(obfsBuf[:n])
+
-		}
+	for name, ep := range encryptionMethods {
-	})
+		b.Run(name, func(b *testing.B) {
+			for seshType, seshConfig := range seshConfigs {
+				b.Run(seshType, func(b *testing.B) {
+					seshConfig.Obfuscator, _ = MakeObfuscator(ep, sessionKey)
+					sesh := MakeSession(0, seshConfig)
+					sesh.AddConnection(connutil.Discard())
+					b.ResetTimer()
+					b.SetBytes(testPayloadLen)
+					b.RunParallel(func(pb *testing.PB) {
+						stream, _ := sesh.OpenStream()
+						for pb.Next() {
+							stream.Write(testPayload)
+						}
+					})
+				})
+			}
+		})
+	}
+}
+
+func BenchmarkLatency(b *testing.B) {
+	var sessionKey [32]byte
+	rand.Read(sessionKey[:])
+
+	for name, ep := range encryptionMethods {
+		b.Run(name, func(b *testing.B) {
+			for seshType, seshConfig := range seshConfigs {
+				b.Run(seshType, func(b *testing.B) {
+					seshConfig.Obfuscator, _ = MakeObfuscator(ep, sessionKey)
+					clientSesh := MakeSession(0, seshConfig)
+					serverSesh := MakeSession(0, seshConfig)
+
+					c, s := net.Pipe()
+					clientSesh.AddConnection(c)
+					serverSesh.AddConnection(s)
+
+					buf := make([]byte, 64)
+					clientStream, _ := clientSesh.OpenStream()
+					clientStream.Write(buf)
+					serverStream, _ := serverSesh.Accept()
+					io.ReadFull(serverStream, buf)
+
+					b.ResetTimer()
+					for i := 0; i < b.N; i++ {
+						clientStream.Write(buf)
+						io.ReadFull(serverStream, buf)
+					}
+				})
+			}
+		})
+	}
 }

internal/multiplex/stream.go

@@ -6,9 +6,10 @@ import (
 	"net"
 	"time"
 
-	log "github.com/sirupsen/logrus"
 	"sync"
 	"sync/atomic"
+
+	log "github.com/sirupsen/logrus"
 )
 
 var ErrBrokenStream = errors.New("broken stream")
@@ -24,46 +25,41 @@ type Stream struct {
 	session *Session
 
 	// a buffer (implemented as an asynchronous buffered pipe) to put data we've received from recvFrame but hasn't
-	// been read by the consumer through Read or WriteTo
+	// been read by the consumer through Read or WriteTo.
 	recvBuf recvBuffer
 
-	nextSendSeq uint64
+	writingM     sync.Mutex
-
+	writingFrame Frame // we do the allocation here to save repeated allocations in Write and ReadFrom
-	writingM sync.Mutex
 
 	// atomic
 	closed uint32
 
-	// lazy allocation for obfsBuf. This is desirable because obfsBuf is only used when data is sent from
-	// the stream (through Write or ReadFrom). Some streams never send data so eager allocation will waste
-	// memory
-	allocIdempot sync.Once
-	// obfuscation happens in this buffer
-	obfsBuf []byte
-
 	// When we want order guarantee (i.e. session.Unordered is false),
 	// we assign each stream a fixed underlying connection.
 	// If the underlying connections the session uses provide ordering guarantee (most likely TCP),
 	// recvBuffer (implemented by streamBuffer under ordered mode) will not receive out-of-order packets
 	// so it won't have to use its priority queue to sort it.
 	// This is not used in unordered connection mode
-	assignedConnId uint32
+	assignedConn net.Conn
 
 	readFromTimeout time.Duration
 }
 
 func makeStream(sesh *Session, id uint32) *Stream {
-	var recvBuf recvBuffer
-	if sesh.Unordered {
-		recvBuf = NewDatagramBufferedPipe()
-	} else {
-		recvBuf = NewStreamBuffer()
-	}
-
 	stream := &Stream{
 		id:      id,
 		session: sesh,
-		recvBuf: recvBuf,
+		writingFrame: Frame{
+			StreamID: id,
+			Seq:      0,
+			Closing:  closingNothing,
+		},
+	}
+
+	if sesh.Unordered {
+		stream.recvBuf = NewDatagramBufferedPipe()
+	} else {
+		stream.recvBuf = NewStreamBuffer()
 	}
 
 	return stream
@@ -72,7 +68,7 @@ func makeStream(sesh *Session, id uint32) *Stream {
 func (s *Stream) isClosed() bool { return atomic.LoadUint32(&s.closed) == 1 }
 
 // receive a readily deobfuscated Frame so its payload can later be Read
-func (s *Stream) recvFrame(frame Frame) error {
+func (s *Stream) recvFrame(frame *Frame) error {
 	toBeClosed, err := s.recvBuf.Write(frame)
 	if toBeClosed {
 		err = s.passiveClose()
@@ -100,26 +96,14 @@ func (s *Stream) Read(buf []byte) (n int, err error) {
 	return
 }
 
-// WriteTo continuously write data Stream has received into the writer w.
+func (s *Stream) obfuscateAndSend(buf []byte, payloadOffsetInBuf int) error {
-func (s *Stream) WriteTo(w io.Writer) (int64, error) {
+	cipherTextLen, err := s.session.obfuscate(&s.writingFrame, buf, payloadOffsetInBuf)
-	// will keep writing until the underlying buffer is closed
+	s.writingFrame.Seq++
-	n, err := s.recvBuf.WriteTo(w)
-	log.Tracef("%v read from stream %v with err %v", n, s.id, err)
-	if err == io.EOF {
-		return n, ErrBrokenStream
-	}
-	return n, nil
-}
-
-func (s *Stream) obfuscateAndSend(f *Frame, payloadOffsetInObfsBuf int) error {
-	var cipherTextLen int
-	cipherTextLen, err := s.session.Obfs(f, s.obfsBuf, payloadOffsetInObfsBuf)
 	if err != nil {
 		return err
 	}
 
-	_, err = s.session.sb.send(s.obfsBuf[:cipherTextLen], &s.assignedConnId)
+	_, err = s.session.sb.send(buf[:cipherTextLen], &s.assignedConn)
-	log.Tracef("%v sent to remote through stream %v with err %v. seq: %v", len(f.Payload), s.id, err, f.Seq)
 	if err != nil {
 		if err == errBrokenSwitchboard {
 			s.session.SetTerminalMsg(err.Error())
@@ -138,9 +122,6 @@ func (s *Stream) Write(in []byte) (n int, err error) {
 		return 0, ErrBrokenStream
 	}
 
-	if s.obfsBuf == nil {
-		s.obfsBuf = make([]byte, s.session.StreamSendBufferSize)
-	}
 	for n < len(in) {
 		var framePayload []byte
 		if len(in)-n <= s.session.maxStreamUnitWrite {
@@ -155,14 +136,10 @@ func (s *Stream) Write(in []byte) (n int, err error) {
 			}
 			framePayload = in[n : s.session.maxStreamUnitWrite+n]
 		}
-		f := &Frame{
+		s.writingFrame.Payload = framePayload
-			StreamID: s.id,
+		buf := s.session.streamObfsBufPool.Get().(*[]byte)
-			Seq:      s.nextSendSeq,
+		err = s.obfuscateAndSend(*buf, 0)
-			Closing:  C_NOOP,
+		s.session.streamObfsBufPool.Put(buf)
-			Payload:  framePayload,
-		}
-		s.nextSendSeq++
-		err = s.obfuscateAndSend(f, 0)
 		if err != nil {
 			return
 		}
@@ -174,9 +151,6 @@ func (s *Stream) Write(in []byte) (n int, err error) {
 // ReadFrom continuously read data from r and send it off, until either r returns error or nothing has been read
 // for readFromTimeout amount of time
 func (s *Stream) ReadFrom(r io.Reader) (n int64, err error) {
-	if s.obfsBuf == nil {
-		s.obfsBuf = make([]byte, s.session.StreamSendBufferSize)
-	}
 	for {
 		if s.readFromTimeout != 0 {
 			if rder, ok := r.(net.Conn); !ok {
@@ -185,24 +159,23 @@ func (s *Stream) ReadFrom(r io.Reader) (n int64, err error) {
 				rder.SetReadDeadline(time.Now().Add(s.readFromTimeout))
 			}
 		}
-		read, er := r.Read(s.obfsBuf[HEADER_LEN : HEADER_LEN+s.session.maxStreamUnitWrite])
+		buf := s.session.streamObfsBufPool.Get().(*[]byte)
+		read, er := r.Read((*buf)[frameHeaderLength : frameHeaderLength+s.session.maxStreamUnitWrite])
 		if er != nil {
 			return n, er
 		}
+
+		// the above read may have been unblocked by another goroutine calling stream.Close(), so we need
+		// to check that here
 		if s.isClosed() {
 			return n, ErrBrokenStream
 		}
 
 		s.writingM.Lock()
-		f := &Frame{
+		s.writingFrame.Payload = (*buf)[frameHeaderLength : frameHeaderLength+read]
-			StreamID: s.id,
+		err = s.obfuscateAndSend(*buf, frameHeaderLength)
-			Seq:      s.nextSendSeq,
-			Closing:  C_NOOP,
-			Payload:  s.obfsBuf[HEADER_LEN : HEADER_LEN+read],
-		}
-		s.nextSendSeq++
-		err = s.obfuscateAndSend(f, HEADER_LEN)
 		s.writingM.Unlock()
+		s.session.streamObfsBufPool.Put(buf)
 
 		if err != nil {
 			return
@@ -226,7 +199,6 @@ func (s *Stream) Close() error {
 func (s *Stream) LocalAddr() net.Addr  { return s.session.addrs.Load().([]net.Addr)[0] }
 func (s *Stream) RemoteAddr() net.Addr { return s.session.addrs.Load().([]net.Addr)[1] }
 
-func (s *Stream) SetWriteToTimeout(d time.Duration)  { s.recvBuf.SetWriteToTimeout(d) }
 func (s *Stream) SetReadDeadline(t time.Time) error  { s.recvBuf.SetReadDeadline(t); return nil }
 func (s *Stream) SetReadFromTimeout(d time.Duration) { s.readFromTimeout = d }
 

internal/multiplex/streamBuffer.go

@@ -13,7 +13,6 @@ package multiplex
 import (
 	"container/heap"
 	"fmt"
-	"io"
 	"sync"
 	"time"
 )
@@ -63,12 +62,12 @@ func NewStreamBuffer() *streamBuffer {
 	return sb
 }
 
-func (sb *streamBuffer) Write(f Frame) (toBeClosed bool, err error) {
+func (sb *streamBuffer) Write(f *Frame) (toBeClosed bool, err error) {
 	sb.recvM.Lock()
 	defer sb.recvM.Unlock()
 	// when there'fs no ooo packages in heap and we receive the next package in order
 	if len(sb.sh) == 0 && f.Seq == sb.nextRecvSeq {
-		if f.Closing != C_NOOP {
+		if f.Closing != closingNothing {
 			return true, nil
 		} else {
 			sb.buf.Write(f.Payload)
@@ -81,11 +80,14 @@ func (sb *streamBuffer) Write(f Frame) (toBeClosed bool, err error) {
 		return false, fmt.Errorf("seq %v is smaller than nextRecvSeq %v", f.Seq, sb.nextRecvSeq)
 	}
 
-	heap.Push(&sb.sh, &f)
+	saved := *f
+	saved.Payload = make([]byte, len(f.Payload))
+	copy(saved.Payload, f.Payload)
+	heap.Push(&sb.sh, &saved)
 	// Keep popping from the heap until empty or to the point that the wanted seq was not received
 	for len(sb.sh) > 0 && sb.sh[0].Seq == sb.nextRecvSeq {
-		f = *heap.Pop(&sb.sh).(*Frame)
+		f = heap.Pop(&sb.sh).(*Frame)
-		if f.Closing != C_NOOP {
+		if f.Closing != closingNothing {
 			return true, nil
 		} else {
 			sb.buf.Write(f.Payload)
@@ -99,10 +101,6 @@ func (sb *streamBuffer) Read(buf []byte) (int, error) {
 	return sb.buf.Read(buf)
 }
 
-func (sb *streamBuffer) WriteTo(w io.Writer) (int64, error) {
-	return sb.buf.WriteTo(w)
-}
-
 func (sb *streamBuffer) Close() error {
 	sb.recvM.Lock()
 	defer sb.recvM.Unlock()
@@ -110,5 +108,4 @@ func (sb *streamBuffer) Close() error {
 	return sb.buf.Close()
 }
 
-func (sb *streamBuffer) SetReadDeadline(t time.Time)       { sb.buf.SetReadDeadline(t) }
+func (sb *streamBuffer) SetReadDeadline(t time.Time) { sb.buf.SetReadDeadline(t) }
-func (sb *streamBuffer) SetWriteToTimeout(d time.Duration) { sb.buf.SetWriteToTimeout(d) }

internal/multiplex/streamBuffer_test.go

@@ -3,6 +3,7 @@ package multiplex
 import (
 	"encoding/binary"
 	"io"
+
 	//"log"
 	"sort"
 	"testing"
@@ -20,11 +21,10 @@ func TestRecvNewFrame(t *testing.T) {
 		for _, n := range set {
 			bu64 := make([]byte, 8)
 			binary.BigEndian.PutUint64(bu64, n)
-			frame := Frame{
+			sb.Write(&Frame{
 				Seq:     n,
 				Payload: bu64,
-			}
+			})
-			sb.Write(frame)
 		}
 
 		var sortedResult []uint64
@@ -80,7 +80,7 @@ func TestStreamBuffer_RecvThenClose(t *testing.T) {
 		Closing:  0,
 		Payload:  testData,
 	}
-	sb.Write(testFrame)
+	sb.Write(&testFrame)
 	sb.Close()
 
 	readBuf := make([]byte, testDataLen)

internal/multiplex/streamBufferedPipe.go

@@ -11,18 +11,20 @@ import (
 
 // The point of a streamBufferedPipe is that Read() will block until data is available
 type streamBufferedPipe struct {
-	// only alloc when on first Read or Write
 	buf *bytes.Buffer
 
 	closed    bool
 	rwCond    *sync.Cond
 	rDeadline time.Time
 	wtTimeout time.Duration
+
+	timeoutTimer *time.Timer
 }
 
 func NewStreamBufferedPipe() *streamBufferedPipe {
 	p := &streamBufferedPipe{
 		rwCond: sync.NewCond(&sync.Mutex{}),
+		buf:    new(bytes.Buffer),
 	}
 	return p
 }
@@ -30,23 +32,24 @@ func NewStreamBufferedPipe() *streamBufferedPipe {
 func (p *streamBufferedPipe) Read(target []byte) (int, error) {
 	p.rwCond.L.Lock()
 	defer p.rwCond.L.Unlock()
-	if p.buf == nil {
-		p.buf = new(bytes.Buffer)
-	}
 	for {
 		if p.closed && p.buf.Len() == 0 {
 			return 0, io.EOF
 		}
-		if !p.rDeadline.IsZero() {
+
-			d := time.Until(p.rDeadline)
+		hasRDeadline := !p.rDeadline.IsZero()
-			if d <= 0 {
+		if hasRDeadline {
+			if time.Until(p.rDeadline) <= 0 {
 				return 0, ErrTimeout
 			}
-			time.AfterFunc(d, p.rwCond.Broadcast)
 		}
 		if p.buf.Len() > 0 {
 			break
 		}
+
+		if hasRDeadline {
+			p.broadcastAfter(time.Until(p.rDeadline))
+		}
 		p.rwCond.Wait()
 	}
 	n, err := p.buf.Read(target)
@@ -55,50 +58,9 @@ func (p *streamBufferedPipe) Read(target []byte) (int, error) {
 	return n, err
 }
 
-func (p *streamBufferedPipe) WriteTo(w io.Writer) (n int64, err error) {
-	p.rwCond.L.Lock()
-	defer p.rwCond.L.Unlock()
-	if p.buf == nil {
-		p.buf = new(bytes.Buffer)
-	}
-	for {
-		if p.closed && p.buf.Len() == 0 {
-			return 0, io.EOF
-		}
-		if !p.rDeadline.IsZero() {
-			d := time.Until(p.rDeadline)
-			if d <= 0 {
-				return 0, ErrTimeout
-			}
-			if p.wtTimeout == 0 {
-				// if there hasn't been a scheduled broadcast
-				time.AfterFunc(d, p.rwCond.Broadcast)
-			}
-		}
-		if p.wtTimeout != 0 {
-			p.rDeadline = time.Now().Add(p.wtTimeout)
-			time.AfterFunc(p.wtTimeout, p.rwCond.Broadcast)
-		}
-		if p.buf.Len() > 0 {
-			written, er := p.buf.WriteTo(w)
-			n += written
-			if er != nil {
-				p.rwCond.Broadcast()
-				return n, er
-			}
-			p.rwCond.Broadcast()
-		} else {
-			p.rwCond.Wait()
-		}
-	}
-}
-
 func (p *streamBufferedPipe) Write(input []byte) (int, error) {
 	p.rwCond.L.Lock()
 	defer p.rwCond.L.Unlock()
-	if p.buf == nil {
-		p.buf = new(bytes.Buffer)
-	}
 	for {
 		if p.closed {
 			return 0, io.ErrClosedPipe
@@ -132,10 +94,9 @@ func (p *streamBufferedPipe) SetReadDeadline(t time.Time) {
 	p.rwCond.Broadcast()
 }
 
-func (p *streamBufferedPipe) SetWriteToTimeout(d time.Duration) {
+func (p *streamBufferedPipe) broadcastAfter(d time.Duration) {
-	p.rwCond.L.Lock()
+	if p.timeoutTimer != nil {
-	defer p.rwCond.L.Unlock()
+		p.timeoutTimer.Stop()
-
+	}
-	p.wtTimeout = d
+	p.timeoutTimer = time.AfterFunc(d, p.rwCond.Broadcast)
-	p.rwCond.Broadcast()
 }

internal/multiplex/streamBufferedPipe_test.go

@@ -1,94 +1,43 @@
 package multiplex
 
 import (
-	"bytes"
 	"math/rand"
 	"testing"
 	"time"
+
+	"github.com/stretchr/testify/assert"
 )
 
+const readBlockTime = 500 * time.Millisecond
+
 func TestPipeRW(t *testing.T) {
 	pipe := NewStreamBufferedPipe()
 	b := []byte{0x01, 0x02, 0x03}
 	n, err := pipe.Write(b)
-	if n != len(b) {
+	assert.NoError(t, err, "simple write")
-		t.Error(
+	assert.Equal(t, len(b), n, "number of bytes written")
-			"For", "number of bytes written",
-			"expecting", len(b),
-			"got", n,
-		)
-		return
-	}
-	if err != nil {
-		t.Error(
-			"For", "simple write",
-			"expecting", "nil error",
-			"got", err,
-		)
-		return
-	}
 
 	b2 := make([]byte, len(b))
 	n, err = pipe.Read(b2)
-	if n != len(b) {
+	assert.NoError(t, err, "simple read")
-		t.Error(
+	assert.Equal(t, len(b), n, "number of bytes read")
-			"For", "number of bytes read",
-			"expecting", len(b),
-			"got", n,
-		)
-		return
-	}
-	if err != nil {
-		t.Error(
-			"For", "simple read",
-			"expecting", "nil error",
-			"got", err,
-		)
-		return
-	}
-	if !bytes.Equal(b, b2) {
-		t.Error(
-			"For", "simple read",
-			"expecting", b,
-			"got", b2,
-		)
-	}
 
+	assert.Equal(t, b, b2)
 }
 
 func TestReadBlock(t *testing.T) {
 	pipe := NewStreamBufferedPipe()
 	b := []byte{0x01, 0x02, 0x03}
 	go func() {
-		time.Sleep(100 * time.Millisecond)
+		time.Sleep(readBlockTime)
 		pipe.Write(b)
 	}()
 	b2 := make([]byte, len(b))
 	n, err := pipe.Read(b2)
-	if n != len(b) {
+	assert.NoError(t, err, "blocked read")
-		t.Error(
+	assert.Equal(t, len(b), n, "number of bytes read after block")
-			"For", "number of bytes read after block",
+
-			"expecting", len(b),
+	assert.Equal(t, b, b2)
-			"got", n,
-		)
-		return
-	}
-	if err != nil {
-		t.Error(
-			"For", "blocked read",
-			"expecting", "nil error",
-			"got", err,
-		)
-		return
-	}
-	if !bytes.Equal(b, b2) {
-		t.Error(
-			"For", "blocked read",
-			"expecting", b,
-			"got", b2,
-		)
-		return
-	}
 }
 
 func TestPartialRead(t *testing.T) {
@@ -97,54 +46,17 @@ func TestPartialRead(t *testing.T) {
 	pipe.Write(b)
 	b1 := make([]byte, 1)
 	n, err := pipe.Read(b1)
-	if n != len(b1) {
+	assert.NoError(t, err, "partial read of 1")
-		t.Error(
+	assert.Equal(t, len(b1), n, "number of bytes in partial read of 1")
-			"For", "number of bytes in partial read of 1",
+
-			"expecting", len(b1),
+	assert.Equal(t, b[0], b1[0])
-			"got", n,
+
-		)
-		return
-	}
-	if err != nil {
-		t.Error(
-			"For", "partial read of 1",
-			"expecting", "nil error",
-			"got", err,
-		)
-		return
-	}
-	if b1[0] != b[0] {
-		t.Error(
-			"For", "partial read of 1",
-			"expecting", b[0],
-			"got", b1[0],
-		)
-	}
 	b2 := make([]byte, 2)
 	n, err = pipe.Read(b2)
-	if n != len(b2) {
+	assert.NoError(t, err, "partial read of 2")
-		t.Error(
+	assert.Equal(t, len(b2), n, "number of bytes in partial read of 2")
-			"For", "number of bytes in partial read of 2",
+
-			"expecting", len(b2),
+	assert.Equal(t, b[1:], b2)
-			"got", n,
-		)
-	}
-	if err != nil {
-		t.Error(
-			"For", "partial read of 2",
-			"expecting", "nil error",
-			"got", err,
-		)
-		return
-	}
-	if !bytes.Equal(b[1:], b2) {
-		t.Error(
-			"For", "partial read of 2",
-			"expecting", b[1:],
-			"got", b2,
-		)
-		return
-	}
 }
 
 func TestReadAfterClose(t *testing.T) {
@@ -154,29 +66,10 @@ func TestReadAfterClose(t *testing.T) {
 	b2 := make([]byte, len(b))
 	pipe.Close()
 	n, err := pipe.Read(b2)
-	if n != len(b) {
+	assert.NoError(t, err, "simple read")
-		t.Error(
+	assert.Equal(t, len(b), n, "number of bytes read")
-			"For", "number of bytes read",
+
-			"expecting", len(b),
+	assert.Equal(t, b, b2)
-			"got", n,
-		)
-	}
-	if err != nil {
-		t.Error(
-			"For", "simple read",
-			"expecting", "nil error",
-			"got", err,
-		)
-		return
-	}
-	if !bytes.Equal(b, b2) {
-		t.Error(
-			"For", "simple read",
-			"expecting", b,
-			"got", b2,
-		)
-		return
-	}
 }
 
 func BenchmarkBufferedPipe_RW(b *testing.B) {

internal/multiplex/stream_test.go

@@ -2,13 +2,14 @@ package multiplex
 
 import (
 	"bytes"
-	"github.com/cbeuw/Cloak/internal/common"
 	"io"
-	"io/ioutil"
 	"math/rand"
 	"testing"
 	"time"
 
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/stretchr/testify/assert"
+
 	"github.com/cbeuw/connutil"
 )
 
@@ -36,9 +37,10 @@ func BenchmarkStream_Write_Ordered(b *testing.B) {
 	testData := make([]byte, testDataLen)
 	rand.Read(testData)
 	eMethods := map[string]byte{
-		"plain":             E_METHOD_PLAIN,
+		"plain":             EncryptionMethodPlain,
-		"chacha20-poly1305": E_METHOD_CHACHA20_POLY1305,
+		"chacha20-poly1305": EncryptionMethodChaha20Poly1305,
-		"aes-gcm":           E_METHOD_AES_GCM,
+		"aes-256-gcm":       EncryptionMethodAES256GCM,
+		"aes-128-gcm":       EncryptionMethodAES128GCM,
 	}
 
 	for name, method := range eMethods {
@@ -55,62 +57,11 @@ func BenchmarkStream_Write_Ordered(b *testing.B) {
 	}
 }
 
-/*
-func BenchmarkStream_Read_Ordered(b *testing.B) {
-	var sessionKey [32]byte
-	rand.Read(sessionKey[:])
-	sesh := setupSesh(false, sessionKey)
-	testPayload := make([]byte, payloadLen)
-	rand.Read(testPayload)
-
-	f := &Frame{
-		1,
-		0,
-		0,
-		testPayload,
-	}
-
-	obfsBuf := make([]byte, 17000)
-
-	l, _ := net.Listen("tcp", "127.0.0.1:0")
-	go func() {
-		// potentially bottlenecked here rather than the actual stream read throughput
-		conn, _ := net.Dial("tcp", l.Addr().String())
-		for {
-			i, _ := sesh.Obfs(f, obfsBuf)
-			f.Seq += 1
-			_, err := conn.Write(obfsBuf[:i])
-			if err != nil {
-				b.Error("cannot write to connection", err)
-			}
-		}
-	}()
-	conn, _ := l.Accept()
-
-	sesh.AddConnection(conn)
-	stream, err := sesh.Accept()
-	if err != nil {
-		b.Error("failed to accept stream", err)
-	}
-
-	//time.Sleep(5*time.Second) // wait for buffer to fill up
-
-	readBuf := make([]byte, payloadLen)
-	b.SetBytes(payloadLen)
-	b.ResetTimer()
-	for j := 0; j < b.N; j++ {
-		stream.Read(readBuf)
-	}
-
-}
-
-*/
-
 func TestStream_Write(t *testing.T) {
 	hole := connutil.Discard()
 	var sessionKey [32]byte
 	rand.Read(sessionKey[:])
-	sesh := setupSesh(false, sessionKey, E_METHOD_PLAIN)
+	sesh := setupSesh(false, sessionKey, EncryptionMethodPlain)
 	sesh.AddConnection(hole)
 	testData := make([]byte, payloadLen)
 	rand.Read(testData)
@@ -129,8 +80,8 @@ func TestStream_WriteSync(t *testing.T) {
 	// Close calls made after write MUST have a higher seq
 	var sessionKey [32]byte
 	rand.Read(sessionKey[:])
-	clientSesh := setupSesh(false, sessionKey, E_METHOD_PLAIN)
+	clientSesh := setupSesh(false, sessionKey, EncryptionMethodPlain)
-	serverSesh := setupSesh(false, sessionKey, E_METHOD_PLAIN)
+	serverSesh := setupSesh(false, sessionKey, EncryptionMethodPlain)
 	w, r := connutil.AsyncPipe()
 	clientSesh.AddConnection(common.NewTLSConn(w))
 	serverSesh.AddConnection(common.NewTLSConn(r))
@@ -185,13 +136,13 @@ func TestStream_Close(t *testing.T) {
 	}
 
 	t.Run("active closing", func(t *testing.T) {
-		sesh := setupSesh(false, sessionKey, E_METHOD_PLAIN)
+		sesh := setupSesh(false, sessionKey, EncryptionMethodPlain)
 		rawConn, rawWritingEnd := connutil.AsyncPipe()
 		sesh.AddConnection(common.NewTLSConn(rawConn))
 		writingEnd := common.NewTLSConn(rawWritingEnd)
 
 		obfsBuf := make([]byte, 512)
-		i, _ := sesh.Obfs(dataFrame, obfsBuf, 0)
+		i, _ := sesh.obfuscate(dataFrame, obfsBuf, 0)
 		_, err := writingEnd.Write(obfsBuf[:i])
 		if err != nil {
 			t.Error("failed to write from remote end")
@@ -201,35 +152,40 @@ func TestStream_Close(t *testing.T) {
 			t.Error("failed to accept stream", err)
 			return
 		}
+		time.Sleep(500 * time.Millisecond)
 		err = stream.Close()
 		if err != nil {
 			t.Error("failed to actively close stream", err)
 			return
 		}
 
-		if sI, _ := sesh.streams.Load(stream.(*Stream).id); sI != nil {
+		sesh.streamsM.Lock()
+		if s, _ := sesh.streams[stream.(*Stream).id]; s != nil {
+			sesh.streamsM.Unlock()
 			t.Error("stream still exists")
 			return
 		}
+		sesh.streamsM.Unlock()
 
 		readBuf := make([]byte, len(testPayload))
 		_, err = io.ReadFull(stream, readBuf)
 		if err != nil {
-			t.Errorf("can't read residual data %v", err)
+			t.Errorf("cannot read resiual data: %v", err)
 		}
+
 		if !bytes.Equal(readBuf, testPayload) {
 			t.Errorf("read wrong data")
 		}
 	})
 
 	t.Run("passive closing", func(t *testing.T) {
-		sesh := setupSesh(false, sessionKey, E_METHOD_PLAIN)
+		sesh := setupSesh(false, sessionKey, EncryptionMethodPlain)
 		rawConn, rawWritingEnd := connutil.AsyncPipe()
 		sesh.AddConnection(common.NewTLSConn(rawConn))
 		writingEnd := common.NewTLSConn(rawWritingEnd)
 
 		obfsBuf := make([]byte, 512)
-		i, err := sesh.Obfs(dataFrame, obfsBuf, 0)
+		i, err := sesh.obfuscate(dataFrame, obfsBuf, 0)
 		if err != nil {
 			t.Errorf("failed to obfuscate frame %v", err)
 		}
@@ -247,11 +203,11 @@ func TestStream_Close(t *testing.T) {
 		closingFrame := &Frame{
 			1,
 			dataFrame.Seq + 1,
-			C_STREAM,
+			closingStream,
 			testPayload,
 		}
 
-		i, err = sesh.Obfs(closingFrame, obfsBuf, 0)
+		i, err = sesh.obfuscate(closingFrame, obfsBuf, 0)
 		if err != nil {
 			t.Errorf("failed to obfuscate frame %v", err)
 		}
@@ -263,11 +219,11 @@ func TestStream_Close(t *testing.T) {
 		closingFrameDup := &Frame{
 			1,
 			dataFrame.Seq + 2,
-			C_STREAM,
+			closingStream,
 			testPayload,
 		}
 
-		i, err = sesh.Obfs(closingFrameDup, obfsBuf, 0)
+		i, err = sesh.obfuscate(closingFrameDup, obfsBuf, 0)
 		if err != nil {
 			t.Errorf("failed to obfuscate frame %v", err)
 		}
@@ -281,11 +237,13 @@ func TestStream_Close(t *testing.T) {
 		if err != nil {
 			t.Errorf("can't read residual data %v", err)
 		}
-		time.Sleep(100 * time.Millisecond)
+
-		if sI, _ := sesh.streams.Load(stream.(*Stream).id); sI != nil {
+		assert.Eventually(t, func() bool {
-			t.Error("stream still exists")
+			sesh.streamsM.Lock()
-			return
+			s, _ := sesh.streams[stream.(*Stream).id]
-		}
+			sesh.streamsM.Unlock()
+			return s == nil
+		}, time.Second, 10*time.Millisecond, "streams still exists")
 
 	})
 }
@@ -306,19 +264,18 @@ func TestStream_Read(t *testing.T) {
 	}
 
 	var streamID uint32
-	buf := make([]byte, 10)
-
-	obfsBuf := make([]byte, 512)
 
 	for name, unordered := range seshes {
-		sesh := setupSesh(unordered, emptyKey, E_METHOD_PLAIN)
+		sesh := setupSesh(unordered, emptyKey, EncryptionMethodPlain)
 		rawConn, rawWritingEnd := connutil.AsyncPipe()
 		sesh.AddConnection(common.NewTLSConn(rawConn))
 		writingEnd := common.NewTLSConn(rawWritingEnd)
 		t.Run(name, func(t *testing.T) {
+			buf := make([]byte, 10)
+			obfsBuf := make([]byte, 512)
 			t.Run("Plain read", func(t *testing.T) {
 				f.StreamID = streamID
-				i, _ := sesh.Obfs(f, obfsBuf, 0)
+				i, _ := sesh.obfuscate(f, obfsBuf, 0)
 				streamID++
 				writingEnd.Write(obfsBuf[:i])
 				stream, err := sesh.Accept()
@@ -343,7 +300,7 @@ func TestStream_Read(t *testing.T) {
 			})
 			t.Run("Nil buf", func(t *testing.T) {
 				f.StreamID = streamID
-				i, _ := sesh.Obfs(f, obfsBuf, 0)
+				i, _ := sesh.obfuscate(f, obfsBuf, 0)
 				streamID++
 				writingEnd.Write(obfsBuf[:i])
 				stream, _ := sesh.Accept()
@@ -355,21 +312,22 @@ func TestStream_Read(t *testing.T) {
 			})
 			t.Run("Read after stream close", func(t *testing.T) {
 				f.StreamID = streamID
-				i, _ := sesh.Obfs(f, obfsBuf, 0)
+				i, _ := sesh.obfuscate(f, obfsBuf, 0)
 				streamID++
 				writingEnd.Write(obfsBuf[:i])
 				stream, _ := sesh.Accept()
+
+				time.Sleep(500 * time.Millisecond)
+
 				stream.Close()
-				i, err := stream.Read(buf)
+
+				_, err := io.ReadFull(stream, buf[:smallPayloadLen])
 				if err != nil {
-					t.Error("failed to read", err)
+					t.Errorf("cannot read residual data: %v", err)
 				}
-				if i != smallPayloadLen {
+				if !bytes.Equal(buf[:smallPayloadLen], testPayload) {
-					t.Errorf("expected read %v, got %v", smallPayloadLen, i)
-				}
-				if !bytes.Equal(buf[:i], testPayload) {
 					t.Error("expected", testPayload,
-						"got", buf[:i])
+						"got", buf[:smallPayloadLen])
 				}
 				_, err = stream.Read(buf)
 				if err == nil {
@@ -379,21 +337,21 @@ func TestStream_Read(t *testing.T) {
 			})
 			t.Run("Read after session close", func(t *testing.T) {
 				f.StreamID = streamID
-				i, _ := sesh.Obfs(f, obfsBuf, 0)
+				i, _ := sesh.obfuscate(f, obfsBuf, 0)
 				streamID++
 				writingEnd.Write(obfsBuf[:i])
 				stream, _ := sesh.Accept()
+
+				time.Sleep(500 * time.Millisecond)
+
 				sesh.Close()
-				i, err := stream.Read(buf)
+				_, err := io.ReadFull(stream, buf[:smallPayloadLen])
 				if err != nil {
-					t.Error("failed to read", err)
+					t.Errorf("cannot read resiual data: %v", err)
 				}
-				if i != smallPayloadLen {
+				if !bytes.Equal(buf[:smallPayloadLen], testPayload) {
-					t.Errorf("expected read %v, got %v", smallPayloadLen, i)
-				}
-				if !bytes.Equal(buf[:i], testPayload) {
 					t.Error("expected", testPayload,
-						"got", buf[:i])
+						"got", buf[:smallPayloadLen])
 				}
 				_, err = stream.Read(buf)
 				if err == nil {
@@ -405,35 +363,10 @@ func TestStream_Read(t *testing.T) {
 	}
 }
 
-func TestStream_SetWriteToTimeout(t *testing.T) {
-	seshes := map[string]*Session{
-		"ordered":   setupSesh(false, emptyKey, E_METHOD_PLAIN),
-		"unordered": setupSesh(true, emptyKey, E_METHOD_PLAIN),
-	}
-	for name, sesh := range seshes {
-		t.Run(name, func(t *testing.T) {
-			stream, _ := sesh.OpenStream()
-			stream.SetWriteToTimeout(100 * time.Millisecond)
-			done := make(chan struct{})
-			go func() {
-				stream.WriteTo(ioutil.Discard)
-				done <- struct{}{}
-			}()
-
-			select {
-			case <-done:
-				return
-			case <-time.After(500 * time.Millisecond):
-				t.Error("didn't timeout")
-			}
-		})
-	}
-}
-
 func TestStream_SetReadFromTimeout(t *testing.T) {
 	seshes := map[string]*Session{
-		"ordered":   setupSesh(false, emptyKey, E_METHOD_PLAIN),
+		"ordered":   setupSesh(false, emptyKey, EncryptionMethodPlain),
-		"unordered": setupSesh(true, emptyKey, E_METHOD_PLAIN),
+		"unordered": setupSesh(true, emptyKey, EncryptionMethodPlain),
 	}
 	for name, sesh := range seshes {
 		t.Run(name, func(t *testing.T) {

internal/multiplex/switchboard.go

@@ -2,19 +2,23 @@ package multiplex
 
 import (
 	"errors"
+	"github.com/cbeuw/Cloak/internal/common"
 	log "github.com/sirupsen/logrus"
-	"math/rand"
+	"math/rand/v2"
 	"net"
 	"sync"
 	"sync/atomic"
 )
 
+type switchboardStrategy int
+
 const (
-	FIXED_CONN_MAPPING switchboardStrategy = iota
+	fixedConnMapping switchboardStrategy = iota
-	UNIFORM_SPREAD
+	uniformSpread
 )
 
-// switchboard is responsible for managing TCP connections between client and server.
+// switchboard represents the connection pool. It is responsible for managing
+// transport-layer connections between client and server.
 // It has several purposes: constantly receiving incoming data from all connections
 // and pass them to Session.recvDataFromRemote(); accepting data through
 // switchboard.send(), in which it selects a connection according to its
@@ -26,148 +30,131 @@ type switchboard struct {
 	valve    Valve
 	strategy switchboardStrategy
 
-	// map of connId to net.Conn
 	conns      sync.Map
-	numConns   uint32
+	connsCount uint32
-	nextConnId uint32
+	randPool   sync.Pool
 
 	broken uint32
 }
 
 func makeSwitchboard(sesh *Session) *switchboard {
-	var strategy switchboardStrategy
-	if sesh.Unordered {
-		log.Debug("Connection is unordered")
-		strategy = UNIFORM_SPREAD
-	} else {
-		strategy = FIXED_CONN_MAPPING
-	}
 	sb := &switchboard{
-		session:    sesh,
+		session:  sesh,
-		strategy:   strategy,
+		strategy: uniformSpread,
-		valve:      sesh.Valve,
+		valve:    sesh.Valve,
-		nextConnId: 1,
+		randPool: sync.Pool{New: func() interface{} {
+			var state [32]byte
+			common.CryptoRandRead(state[:])
+			return rand.New(rand.NewChaCha8(state))
+		}},
 	}
 	return sb
 }
 
 var errBrokenSwitchboard = errors.New("the switchboard is broken")
 
-func (sb *switchboard) connsCount() int {
-	return int(atomic.LoadUint32(&sb.numConns))
-}
-
 func (sb *switchboard) addConn(conn net.Conn) {
-	connId := atomic.AddUint32(&sb.nextConnId, 1) - 1
+	connId := atomic.AddUint32(&sb.connsCount, 1) - 1
-	atomic.AddUint32(&sb.numConns, 1)
 	sb.conns.Store(connId, conn)
-	go sb.deplex(connId, conn)
+	go sb.deplex(conn)
 }
 
-// a pointer to connId is passed here so that the switchboard can reassign it if that connId isn't usable
+// a pointer to assignedConn is passed here so that the switchboard can reassign it if that conn isn't usable
-func (sb *switchboard) send(data []byte, connId *uint32) (n int, err error) {
+func (sb *switchboard) send(data []byte, assignedConn *net.Conn) (n int, err error) {
-	writeAndRegUsage := func(conn net.Conn, d []byte) (int, error) {
-		n, err = conn.Write(d)
-		if err != nil {
-			sb.conns.Delete(*connId)
-			sb.close("failed to write to remote " + err.Error())
-			return n, err
-		}
-		sb.valve.AddTx(int64(n))
-		return n, nil
-	}
-
 	sb.valve.txWait(len(data))
-	if atomic.LoadUint32(&sb.broken) == 1 || sb.connsCount() == 0 {
+	if atomic.LoadUint32(&sb.broken) == 1 {
 		return 0, errBrokenSwitchboard
 	}
 
+	var conn net.Conn
 	switch sb.strategy {
-	case UNIFORM_SPREAD:
+	case uniformSpread:
-		_, conn, err := sb.pickRandConn()
+		conn, err = sb.pickRandConn()
 		if err != nil {
 			return 0, errBrokenSwitchboard
 		}
-		return writeAndRegUsage(conn, data)
+		n, err = conn.Write(data)
-	case FIXED_CONN_MAPPING:
+		if err != nil {
-		connI, ok := sb.conns.Load(*connId)
+			sb.session.SetTerminalMsg("failed to send to remote " + err.Error())
-		if ok {
+			sb.session.passiveClose()
-			conn := connI.(net.Conn)
+			return n, err
-			return writeAndRegUsage(conn, data)
+		}
-		} else {
+	case fixedConnMapping:
-			newConnId, conn, err := sb.pickRandConn()
+		// FIXME: this strategy has a tendency to cause a TLS conn socket buffer to fill up,
+		// which is a problem when multiple streams are mapped to the same conn, resulting
+		// in all such streams being blocked.
+		conn = *assignedConn
+		if conn == nil {
+			conn, err = sb.pickRandConn()
 			if err != nil {
-				return 0, errBrokenSwitchboard
+				sb.session.SetTerminalMsg("failed to pick a connection " + err.Error())
+				sb.session.passiveClose()
+				return 0, err
 			}
-			*connId = newConnId
+			*assignedConn = conn
-			return writeAndRegUsage(conn, data)
+		}
+		n, err = conn.Write(data)
+		if err != nil {
+			sb.session.SetTerminalMsg("failed to send to remote " + err.Error())
+			sb.session.passiveClose()
+			return n, err
 		}
 	default:
 		return 0, errors.New("unsupported traffic distribution strategy")
 	}
+
+	sb.valve.AddTx(int64(n))
+	return n, nil
 }
 
-// returns a random connId
+// returns a random conn. This function can be called concurrently.
-func (sb *switchboard) pickRandConn() (uint32, net.Conn, error) {
+func (sb *switchboard) pickRandConn() (net.Conn, error) {
-	connCount := sb.connsCount()
+	if atomic.LoadUint32(&sb.broken) == 1 {
-	if atomic.LoadUint32(&sb.broken) == 1 || connCount == 0 {
+		return nil, errBrokenSwitchboard
-		return 0, nil, errBrokenSwitchboard
 	}
 
-	// there is no guarantee that sb.conns still has the same amount of entries
+	connsCount := atomic.LoadUint32(&sb.connsCount)
-	// between the count loop and the pick loop
+	if connsCount == 0 {
-	// so if the r > len(sb.conns) at the point of range call, the last visited element is picked
+		return nil, errBrokenSwitchboard
-	var id uint32
-	var conn net.Conn
-	r := rand.Intn(connCount)
-	var c int
-	sb.conns.Range(func(connIdI, connI interface{}) bool {
-		if r == c {
-			id = connIdI.(uint32)
-			conn = connI.(net.Conn)
-			return false
-		}
-		c++
-		return true
-	})
-	// if len(sb.conns) is 0
-	if conn == nil {
-		return 0, nil, errBrokenSwitchboard
 	}
-	return id, conn, nil
-}
 
-func (sb *switchboard) close(terminalMsg string) {
+	randReader := sb.randPool.Get().(*rand.Rand)
-	atomic.StoreUint32(&sb.broken, 1)
+	connId := randReader.Uint32N(connsCount)
-	if !sb.session.IsClosed() {
+	sb.randPool.Put(randReader)
-		sb.session.SetTerminalMsg(terminalMsg)
+
-		sb.session.passiveClose()
+	ret, ok := sb.conns.Load(connId)
+	if !ok {
+		log.Errorf("failed to get conn %d", connId)
+		return nil, errBrokenSwitchboard
 	}
+	return ret.(net.Conn), nil
 }
 
 // actively triggered by session.Close()
 func (sb *switchboard) closeAll() {
-	sb.conns.Range(func(key, connI interface{}) bool {
+	if !atomic.CompareAndSwapUint32(&sb.broken, 0, 1) {
-		conn := connI.(net.Conn)
+		return
-		conn.Close()
+	}
-		sb.conns.Delete(key)
+	atomic.StoreUint32(&sb.connsCount, 0)
+	sb.conns.Range(func(_, conn interface{}) bool {
+		conn.(net.Conn).Close()
+		sb.conns.Delete(conn)
 		return true
 	})
 }
 
 // deplex function costantly reads from a TCP connection
-func (sb *switchboard) deplex(connId uint32, conn net.Conn) {
+func (sb *switchboard) deplex(conn net.Conn) {
 	defer conn.Close()
-	buf := make([]byte, sb.session.ConnReceiveBufferSize)
+	buf := make([]byte, sb.session.connReceiveBufferSize)
 	for {
 		n, err := conn.Read(buf)
 		sb.valve.rxWait(n)
 		sb.valve.AddRx(int64(n))
 		if err != nil {
 			log.Debugf("a connection for session %v has closed: %v", sb.session.id, err)
-			sb.conns.Delete(connId)
+			sb.session.SetTerminalMsg("a connection has dropped unexpectedly")
-			atomic.AddUint32(&sb.numConns, ^uint32(0))
+			sb.session.passiveClose()
-			sb.close("a connection has dropped unexpectedly")
 			return
 		}
 

internal/multiplex/switchboard_test.go

@@ -1,11 +1,14 @@
 package multiplex
 
 import (
-	"github.com/cbeuw/connutil"
 	"math/rand"
 	"sync"
+	"sync/atomic"
 	"testing"
 	"time"
+
+	"github.com/cbeuw/connutil"
+	"github.com/stretchr/testify/assert"
 )
 
 func TestSwitchboard_Send(t *testing.T) {
@@ -13,14 +16,14 @@ func TestSwitchboard_Send(t *testing.T) {
 		sesh := MakeSession(0, seshConfig)
 		hole0 := connutil.Discard()
 		sesh.sb.addConn(hole0)
-		connId, _, err := sesh.sb.pickRandConn()
+		conn, err := sesh.sb.pickRandConn()
 		if err != nil {
 			t.Error("failed to get a random conn", err)
 			return
 		}
 		data := make([]byte, 1000)
 		rand.Read(data)
-		_, err = sesh.sb.send(data, &connId)
+		_, err = sesh.sb.send(data, &conn)
 		if err != nil {
 			t.Error(err)
 			return
@@ -28,23 +31,23 @@ func TestSwitchboard_Send(t *testing.T) {
 
 		hole1 := connutil.Discard()
 		sesh.sb.addConn(hole1)
-		connId, _, err = sesh.sb.pickRandConn()
+		conn, err = sesh.sb.pickRandConn()
 		if err != nil {
 			t.Error("failed to get a random conn", err)
 			return
 		}
-		_, err = sesh.sb.send(data, &connId)
+		_, err = sesh.sb.send(data, &conn)
 		if err != nil {
 			t.Error(err)
 			return
 		}
 
-		connId, _, err = sesh.sb.pickRandConn()
+		conn, err = sesh.sb.pickRandConn()
 		if err != nil {
 			t.Error("failed to get a random conn", err)
 			return
 		}
-		_, err = sesh.sb.send(data, &connId)
+		_, err = sesh.sb.send(data, &conn)
 		if err != nil {
 			t.Error(err)
 			return
@@ -70,7 +73,7 @@ func BenchmarkSwitchboard_Send(b *testing.B) {
 	seshConfig := SessionConfig{}
 	sesh := MakeSession(0, seshConfig)
 	sesh.sb.addConn(hole)
-	connId, _, err := sesh.sb.pickRandConn()
+	conn, err := sesh.sb.pickRandConn()
 	if err != nil {
 		b.Error("failed to get a random conn", err)
 		return
@@ -80,7 +83,7 @@ func BenchmarkSwitchboard_Send(b *testing.B) {
 	b.SetBytes(int64(len(data)))
 	b.ResetTimer()
 	for i := 0; i < b.N; i++ {
-		sesh.sb.send(data, &connId)
+		sesh.sb.send(data, &conn)
 	}
 }
 
@@ -91,7 +94,7 @@ func TestSwitchboard_TxCredit(t *testing.T) {
 	sesh := MakeSession(0, seshConfig)
 	hole := connutil.Discard()
 	sesh.sb.addConn(hole)
-	connId, _, err := sesh.sb.pickRandConn()
+	conn, err := sesh.sb.pickRandConn()
 	if err != nil {
 		t.Error("failed to get a random conn", err)
 		return
@@ -99,10 +102,10 @@ func TestSwitchboard_TxCredit(t *testing.T) {
 	data := make([]byte, 1000)
 	rand.Read(data)
 
-	t.Run("FIXED CONN MAPPING", func(t *testing.T) {
+	t.Run("fixed conn mapping", func(t *testing.T) {
 		*sesh.sb.valve.(*LimitedValve).tx = 0
-		sesh.sb.strategy = FIXED_CONN_MAPPING
+		sesh.sb.strategy = fixedConnMapping
-		n, err := sesh.sb.send(data[:10], &connId)
+		n, err := sesh.sb.send(data[:10], &conn)
 		if err != nil {
 			t.Error(err)
 			return
@@ -115,10 +118,10 @@ func TestSwitchboard_TxCredit(t *testing.T) {
 			t.Error("tx credit didn't increase by 10")
 		}
 	})
-	t.Run("UNIFORM", func(t *testing.T) {
+	t.Run("uniform spread", func(t *testing.T) {
 		*sesh.sb.valve.(*LimitedValve).tx = 0
-		sesh.sb.strategy = UNIFORM_SPREAD
+		sesh.sb.strategy = uniformSpread
-		n, err := sesh.sb.send(data[:10], &connId)
+		n, err := sesh.sb.send(data[:10], &conn)
 		if err != nil {
 			t.Error(err)
 			return
@@ -136,7 +139,7 @@ func TestSwitchboard_TxCredit(t *testing.T) {
 func TestSwitchboard_CloseOnOneDisconn(t *testing.T) {
 	var sessionKey [32]byte
 	rand.Read(sessionKey[:])
-	sesh := setupSesh(false, sessionKey, E_METHOD_PLAIN)
+	sesh := setupSesh(false, sessionKey, EncryptionMethodPlain)
 
 	conn0client, conn0server := connutil.AsyncPipe()
 	sesh.AddConnection(conn0client)
@@ -145,11 +148,11 @@ func TestSwitchboard_CloseOnOneDisconn(t *testing.T) {
 	sesh.AddConnection(conn1client)
 
 	conn0server.Close()
-	time.Sleep(500 * time.Millisecond)
+
-	if !sesh.IsClosed() {
+	assert.Eventually(t, func() bool {
-		t.Error("session not closed after one conn is disconnected")
+		return sesh.IsClosed()
-		return
+	}, time.Second, 10*time.Millisecond, "session not closed after one conn is disconnected")
-	}
+
 	if _, err := conn1client.Write([]byte{0x00}); err == nil {
 		t.Error("the other conn is still connected")
 		return
@@ -172,15 +175,13 @@ func TestSwitchboard_ConnsCount(t *testing.T) {
 	}
 	wg.Wait()
 
-	if sesh.sb.connsCount() != 1000 {
+	if atomic.LoadUint32(&sesh.sb.connsCount) != 1000 {
 		t.Error("connsCount incorrect")
 	}
 
 	sesh.sb.closeAll()
 
-	time.Sleep(500 * time.Millisecond)
+	assert.Eventuallyf(t, func() bool {
-	if sesh.sb.connsCount() != 0 {
+		return atomic.LoadUint32(&sesh.sb.connsCount) == 0
-		t.Error("connsCount incorrect")
+	}, time.Second, 10*time.Millisecond, "connsCount incorrect: %v", atomic.LoadUint32(&sesh.sb.connsCount))
-	}
-
 }

internal/server/TLS.go

@@ -4,11 +4,11 @@ import (
 	"crypto"
 	"errors"
 	"fmt"
+	"io"
+	"net"
+
 	"github.com/cbeuw/Cloak/internal/common"
 	"github.com/cbeuw/Cloak/internal/ecdh"
-	"io"
-	"math/rand"
-	"net"
 
 	log "github.com/sirupsen/logrus"
 )
@@ -45,8 +45,7 @@ func (TLS) makeResponder(clientHelloSessionId []byte, sharedSecret [32]byte) Res
 		// the cert length needs to be the same for all handshakes belonging to the same session
 		// we can use sessionKey as a seed here to ensure consistency
 		possibleCertLengths := []int{42, 27, 68, 59, 36, 44, 46}
-		rand.Seed(int64(sessionKey[0]))
+		cert := make([]byte, possibleCertLengths[common.RandInt(len(possibleCertLengths))])
-		cert := make([]byte, possibleCertLengths[rand.Intn(len(possibleCertLengths))])
 		common.RandRead(randSource, cert)
 
 		var nonce [12]byte
@@ -79,7 +78,13 @@ func (TLS) unmarshalClientHello(ch *ClientHello, staticPv crypto.PrivateKey) (fr
 		return
 	}
 
-	copy(fragments.sharedSecret[:], ecdh.GenerateSharedSecret(staticPv, ephPub))
+	var sharedSecret []byte
+	sharedSecret, err = ecdh.GenerateSharedSecret(staticPv, ephPub)
+	if err != nil {
+		return
+	}
+
+	copy(fragments.sharedSecret[:], sharedSecret)
 	var keyShare []byte
 	keyShare, err = parseKeyShare(ch.extensions[[2]byte{0x00, 0x33}])
 	if err != nil {

internal/server/TLSAux.go

@@ -5,6 +5,7 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
+
 	"github.com/cbeuw/Cloak/internal/common"
 )
 
@@ -163,12 +164,12 @@ func parseClientHello(data []byte) (ret *ClientHello, err error) {
 func composeServerHello(sessionId []byte, nonce [12]byte, encryptedSessionKeyWithTag [48]byte) []byte {
 	var serverHello [11][]byte
 	serverHello[0] = []byte{0x02}                                             // handshake type
-	serverHello[1] = []byte{0x00, 0x00, 0x76}                                 // length 77
+	serverHello[1] = []byte{0x00, 0x00, 0x76}                                 // length 118
 	serverHello[2] = []byte{0x03, 0x03}                                       // server version
 	serverHello[3] = append(nonce[0:12], encryptedSessionKeyWithTag[0:20]...) // random 32 bytes
 	serverHello[4] = []byte{0x20}                                             // session id length 32
 	serverHello[5] = sessionId                                                // session id
-	serverHello[6] = []byte{0xc0, 0x30}                                       // cipher suite TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384
+	serverHello[6] = []byte{0x13, 0x02}                                       // cipher suite TLS_AES_256_GCM_SHA384
 	serverHello[7] = []byte{0x00}                                             // compression method null
 	serverHello[8] = []byte{0x00, 0x2e}                                       // extensions length 46
 

internal/server/activeuser.go

@@ -1,9 +1,10 @@
 package server
 
 import (
-	"github.com/cbeuw/Cloak/internal/server/usermanager"
 	"sync"
 
+	"github.com/cbeuw/Cloak/internal/server/usermanager"
+
 	mux "github.com/cbeuw/Cloak/internal/multiplex"
 )
 

internal/server/activeuser_test.go

@@ -3,12 +3,13 @@ package server
 import (
 	"crypto/rand"
 	"encoding/base64"
-	"github.com/cbeuw/Cloak/internal/common"
-	mux "github.com/cbeuw/Cloak/internal/multiplex"
-	"github.com/cbeuw/Cloak/internal/server/usermanager"
 	"io/ioutil"
 	"os"
 	"testing"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	mux "github.com/cbeuw/Cloak/internal/multiplex"
+	"github.com/cbeuw/Cloak/internal/server/usermanager"
 )
 
 func getSeshConfig(unordered bool) mux.SessionConfig {

internal/server/auth.go

@@ -5,9 +5,10 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"github.com/cbeuw/Cloak/internal/common"
 	"time"
 
+	"github.com/cbeuw/Cloak/internal/common"
+
 	log "github.com/sirupsen/logrus"
 )
 
@@ -50,7 +51,7 @@ func decryptClientInfo(fragments authFragments, serverTime time.Time) (info Clie
 
 	timestamp := int64(binary.BigEndian.Uint64(plaintext[29:37]))
 	clientTime := time.Unix(timestamp, 0)
-	if !(clientTime.After(serverTime.Truncate(TIMESTAMP_TOLERANCE)) && clientTime.Before(serverTime.Add(TIMESTAMP_TOLERANCE))) {
+	if !(clientTime.After(serverTime.Add(-timestampTolerance)) && clientTime.Before(serverTime.Add(timestampTolerance))) {
 		err = fmt.Errorf("%v: received timestamp %v", ErrTimestampOutOfWindow, timestamp)
 		return
 	}
@@ -60,7 +61,7 @@ func decryptClientInfo(fragments authFragments, serverTime time.Time) (info Clie
 
 var ErrReplay = errors.New("duplicate random")
 var ErrBadProxyMethod = errors.New("invalid proxy method")
-var ErrBadDecryption = errors.New("decryption/authentication faliure")
+var ErrBadDecryption = errors.New("decryption/authentication failure")
 
 // AuthFirstPacket checks if the first packet of data is ClientHello or HTTP GET, and checks if it was from a Cloak client
 // if it is from a Cloak client, it returns the ClientInfo with the decrypted fields. It doesn't check if the user
@@ -77,16 +78,12 @@ func AuthFirstPacket(firstPacket []byte, transport Transport, sta *State) (info
 		return
 	}
 
-	info, err = decryptClientInfo(fragments, sta.WorldState.Now())
+	info, err = decryptClientInfo(fragments, sta.WorldState.Now().UTC())
 	if err != nil {
 		log.Debug(err)
 		err = fmt.Errorf("%w: %v", ErrBadDecryption, err)
 		return
 	}
-	if _, ok := sta.ProxyBook[info.ProxyMethod]; !ok {
-		err = ErrBadProxyMethod
-		return
-	}
 	info.Transport = transport
 	return
 }

internal/server/auth_test.go

@@ -4,13 +4,14 @@ import (
 	"crypto"
 	"encoding/hex"
 	"fmt"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/cbeuw/Cloak/internal/ecdh"
 	"testing"
 	"time"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/cbeuw/Cloak/internal/ecdh"
 )
 
-func TestTouchStone(t *testing.T) {
+func TestDecryptClientInfo(t *testing.T) {
 	pvBytes, _ := hex.DecodeString("10de5a3c4a4d04efafc3e06d1506363a72bd6d053baef123e6a9a79a0c04b547")
 	p, _ := ecdh.Unmarshal(pvBytes)
 	staticPv := p.(crypto.PrivateKey)
@@ -49,7 +50,7 @@ func TestTouchStone(t *testing.T) {
 			t.Errorf("expecting no error, got %v", err)
 			return
 		}
-		nineSixSixM50 := time.Unix(1565998966, 0).Truncate(50)
+		nineSixSixM50 := time.Unix(1565998966, 0).Add(-50)
 		_, err = decryptClientInfo(ai, nineSixSixM50)
 		if err != nil {
 			t.Errorf("expecting no error, got %v", err)
@@ -66,7 +67,7 @@ func TestTouchStone(t *testing.T) {
 			return
 		}
 
-		nineSixSixOver := time.Unix(1565998966, 0).Add(TIMESTAMP_TOLERANCE + 10)
+		nineSixSixOver := time.Unix(1565998966, 0).Add(timestampTolerance + 10)
 		_, err = decryptClientInfo(ai, nineSixSixOver)
 		if err == nil {
 			t.Errorf("expecting %v, got %v", ErrTimestampOutOfWindow, err)
@@ -82,7 +83,7 @@ func TestTouchStone(t *testing.T) {
 			return
 		}
 
-		nineSixSixUnder := time.Unix(1565998966, 0).Add(TIMESTAMP_TOLERANCE - 10)
+		nineSixSixUnder := time.Unix(1565998966, 0).Add(-(timestampTolerance + 10))
 		_, err = decryptClientInfo(ai, nineSixSixUnder)
 		if err == nil {
 			t.Errorf("expecting %v, got %v", ErrTimestampOutOfWindow, err)

internal/server/dispatcher.go

@@ -6,19 +6,22 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/cbeuw/Cloak/internal/server/usermanager"
 	"io"
 	"net"
 	"net/http"
 	"time"
 
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/cbeuw/Cloak/internal/server/usermanager"
+
 	mux "github.com/cbeuw/Cloak/internal/multiplex"
 	log "github.com/sirupsen/logrus"
 )
 
 var b64 = base64.StdEncoding.EncodeToString
 
+const firstPacketSize = 3000
+
 func Serve(l net.Listener, sta *State) {
 	waitDur := [10]time.Duration{
 		50 * time.Millisecond, 100 * time.Millisecond, 300 * time.Millisecond, 500 * time.Millisecond, 1 * time.Second,
@@ -123,7 +126,7 @@ func readFirstPacket(conn net.Conn, buf []byte, timeout time.Duration) (int, Tra
 
 func dispatchConnection(conn net.Conn, sta *State) {
 	var err error
-	buf := make([]byte, 1500)
+	buf := make([]byte, firstPacketSize)
 
 	i, transport, redirOnErr, err := readFirstPacket(conn, buf, 15*time.Second)
 	data := buf[:i]
@@ -175,7 +178,13 @@ func dispatchConnection(conn net.Conn, sta *State) {
 	common.RandRead(sta.WorldState.Rand, sessionKey[:])
 	obfuscator, err := mux.MakeObfuscator(ci.EncryptionMethod, sessionKey)
 	if err != nil {
-		log.Error(err)
+		log.WithFields(log.Fields{
+			"remoteAddr":       conn.RemoteAddr(),
+			"UID":              b64(ci.UID),
+			"sessionId":        ci.SessionId,
+			"proxyMethod":      ci.ProxyMethod,
+			"encryptionMethod": ci.EncryptionMethod,
+		}).Error(err)
 		goWeb()
 		return
 	}
@@ -190,7 +199,7 @@ func dispatchConnection(conn net.Conn, sta *State) {
 	// adminUID can use the server as normal with unlimited QoS credits. The adminUID is not
 	// added to the userinfo database. The distinction between going into the admin mode
 	// and normal proxy mode is that sessionID needs == 0 for admin mode
-	if bytes.Equal(ci.UID, sta.AdminUID) && ci.SessionId == 0 {
+	if len(sta.AdminUID) != 0 && bytes.Equal(ci.UID, sta.AdminUID) && ci.SessionId == 0 {
 		sesh := mux.MakeSession(0, seshConfig)
 		preparedConn, err := finishHandshake(conn, sessionKey, sta.WorldState.Rand)
 		if err != nil {
@@ -207,6 +216,18 @@ func dispatchConnection(conn net.Conn, sta *State) {
 		return
 	}
 
+	if _, ok := sta.ProxyBook[ci.ProxyMethod]; !ok {
+		log.WithFields(log.Fields{
+			"remoteAddr":       conn.RemoteAddr(),
+			"UID":              b64(ci.UID),
+			"sessionId":        ci.SessionId,
+			"proxyMethod":      ci.ProxyMethod,
+			"encryptionMethod": ci.EncryptionMethod,
+		}).Error(ErrBadProxyMethod)
+		goWeb()
+		return
+	}
+
 	var user *ActiveUser
 	if sta.IsBypass(ci.UID) {
 		user, err = sta.Panel.GetBypassUser(ci.UID)
@@ -230,7 +251,7 @@ func dispatchConnection(conn net.Conn, sta *State) {
 		return
 	}
 
-	preparedConn, err := finishHandshake(conn, sesh.SessionKey, sta.WorldState.Rand)
+	preparedConn, err := finishHandshake(conn, sesh.GetSessionKey(), sta.WorldState.Rand)
 	if err != nil {
 		log.Error(err)
 		return
@@ -275,8 +296,6 @@ func serveSession(sesh *mux.Session, ci ClientInfo, user *ActiveUser, sta *State
 		}
 		log.Tracef("%v endpoint has been successfully connected", ci.ProxyMethod)
 
-		// if stream has nothing to send to proxy server for sta.Timeout period of time, stream will return error
-		newStream.(*mux.Stream).SetWriteToTimeout(sta.Timeout)
 		go func() {
 			if _, err := common.Copy(localConn, newStream); err != nil {
 				log.Tracef("copying stream to proxy server: %v", err)

internal/server/dispatcher_test.go

@@ -2,12 +2,13 @@ package server
 
 import (
 	"encoding/hex"
-	"github.com/cbeuw/connutil"
-	"github.com/stretchr/testify/assert"
 	"io"
 	"net"
 	"testing"
 	"time"
+
+	"github.com/cbeuw/connutil"
+	"github.com/stretchr/testify/assert"
 )
 
 type rfpReturnValue struct {

internal/server/first_packet_fuzz.go

@@ -1,13 +1,15 @@
+//go:build gofuzz
 // +build gofuzz
 
 package server
 
 import (
 	"errors"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/cbeuw/connutil"
 	"net"
 	"time"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/cbeuw/connutil"
 )
 
 type rfpReturnValue_fuzz struct {

internal/server/state.go

@@ -5,26 +5,26 @@ import (
 	"encoding/json"
 	"errors"
 	"fmt"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/cbeuw/Cloak/internal/server/usermanager"
 	"io/ioutil"
 	"net"
 	"strings"
 	"sync"
 	"time"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/cbeuw/Cloak/internal/server/usermanager"
 )
 
 type RawConfig struct {
-	ProxyBook     map[string][]string
+	ProxyBook    map[string][]string
-	BindAddr      []string
+	BindAddr     []string
-	BypassUID     [][]byte
+	BypassUID    [][]byte
-	RedirAddr     string
+	RedirAddr    string
-	PrivateKey    []byte
+	PrivateKey   []byte
-	AdminUID      []byte
+	AdminUID     []byte
-	DatabasePath  string
+	DatabasePath string
-	StreamTimeout int
+	KeepAlive    int
-	KeepAlive     int
+	CncMode      bool
-	CncMode       bool
 }
 
 // State type stores the global state of the program
@@ -34,8 +34,6 @@ type State struct {
 
 	WorldState common.WorldState
 	AdminUID   []byte
-	Timeout    time.Duration
-	//KeepAlive time.Duration
 
 	BypassUID map[[16]byte]struct{}
 	StaticPv  crypto.PrivateKey
@@ -146,19 +144,18 @@ func InitState(preParse RawConfig, worldState common.WorldState) (sta *State, er
 		err = errors.New("command & control mode not implemented")
 		return
 	} else {
-		manager, err := usermanager.MakeLocalManager(preParse.DatabasePath, worldState)
+		var manager usermanager.UserManager
-		if err != nil {
+		if len(preParse.AdminUID) == 0 || preParse.DatabasePath == "" {
-			return sta, err
+			manager = &usermanager.Voidmanager{}
+		} else {
+			manager, err = usermanager.MakeLocalManager(preParse.DatabasePath, worldState)
+			if err != nil {
+				return sta, err
+			}
 		}
 		sta.Panel = MakeUserPanel(manager)
 	}
 
-	if preParse.StreamTimeout == 0 {
-		sta.Timeout = time.Duration(300) * time.Second
-	} else {
-		sta.Timeout = time.Duration(preParse.StreamTimeout) * time.Second
-	}
-
 	if preParse.KeepAlive <= 0 {
 		sta.ProxyDialer = &net.Dialer{KeepAlive: -1}
 	} else {
@@ -177,6 +174,10 @@ func InitState(preParse RawConfig, worldState common.WorldState) (sta *State, er
 		return
 	}
 
+	if len(preParse.PrivateKey) == 0 {
+		err = fmt.Errorf("must have a valid private key. Run `ck-server -key` to generate one")
+		return
+	}
 	var pv [32]byte
 	copy(pv[:], preParse.PrivateKey)
 	sta.StaticPv = &pv
@@ -188,8 +189,10 @@ func InitState(preParse RawConfig, worldState common.WorldState) (sta *State, er
 		copy(arrUID[:], UID)
 		sta.BypassUID[arrUID] = struct{}{}
 	}
-	copy(arrUID[:], sta.AdminUID)
+	if len(sta.AdminUID) != 0 {
-	sta.BypassUID[arrUID] = struct{}{}
+		copy(arrUID[:], sta.AdminUID)
+		sta.BypassUID[arrUID] = struct{}{}
+	}
 
 	go sta.UsedRandomCleaner()
 	return sta, nil
@@ -203,17 +206,17 @@ func (sta *State) IsBypass(UID []byte) bool {
 	return exist
 }
 
-const TIMESTAMP_TOLERANCE = 180 * time.Second
+const timestampTolerance = 180 * time.Second
 
-const CACHE_CLEAN_INTERVAL = 12 * time.Hour
+const replayCacheAgeLimit = 12 * time.Hour
 
-// UsedRandomCleaner clears the cache of used random fields every CACHE_CLEAN_INTERVAL
+// UsedRandomCleaner clears the cache of used random fields every replayCacheAgeLimit
 func (sta *State) UsedRandomCleaner() {
 	for {
-		time.Sleep(CACHE_CLEAN_INTERVAL)
+		time.Sleep(replayCacheAgeLimit)
 		sta.usedRandomM.Lock()
 		for key, t := range sta.UsedRandom {
-			if time.Unix(t, 0).Before(sta.WorldState.Now().Add(TIMESTAMP_TOLERANCE)) {
+			if time.Unix(t, 0).Before(sta.WorldState.Now().Add(timestampTolerance)) {
 				delete(sta.UsedRandom, key)
 			}
 		}

internal/server/state_test.go

@@ -43,13 +43,22 @@ func TestParseRedirAddr(t *testing.T) {
 			t.Errorf("parsing %v error: %v", domainNoPort, err)
 			return
 		}
-		expHost, err := net.ResolveIPAddr("ip", "example.com")
+
+		expIPs, err := net.LookupIP("example.com")
 		if err != nil {
 			t.Errorf("tester error: cannot resolve example.com: %v", err)
 			return
 		}
-		if host.String() != expHost.String() {
+
-			t.Errorf("expected %v got %v", expHost.String(), host.String())
+		contain := false
+		for _, expIP := range expIPs {
+			if expIP.String() == host.String() {
+				contain = true
+			}
+		}
+
+		if !contain {
+			t.Errorf("expected one of %v got %v", expIPs, host.String())
 		}
 		if port != "" {
 			t.Errorf("port not empty when there is no port")
@@ -63,13 +72,22 @@ func TestParseRedirAddr(t *testing.T) {
 			t.Errorf("parsing %v error: %v", domainWPort, err)
 			return
 		}
-		expHost, err := net.ResolveIPAddr("ip", "example.com")
+
+		expIPs, err := net.LookupIP("example.com")
 		if err != nil {
 			t.Errorf("tester error: cannot resolve example.com: %v", err)
 			return
 		}
-		if host.String() != expHost.String() {
+
-			t.Errorf("expected %v got %v", expHost.String(), host.String())
+		contain := false
+		for _, expIP := range expIPs {
+			if expIP.String() == host.String() {
+				contain = true
+			}
+		}
+
+		if !contain {
+			t.Errorf("expected one of %v got %v", expIPs, host.String())
 		}
 		if port != "80" {
 			t.Errorf("wrong port: expected %v, got %v", "80", port)

internal/server/usermanager/api.yaml

@@ -2,7 +2,7 @@ swagger: '2.0'
 info:
   description: |
     This is the API of Cloak server
-  version: 1.0.0
+  version: 0.0.2
   title: Cloak Server
   contact:
     email: cbeuw.andy@gmail.com
@@ -12,8 +12,6 @@ info:
 # host: petstore.swagger.io
 # basePath: /v2
 tags:
-  - name: admin
-    description: Endpoints used by the host administrators
   - name: users
     description: Operations related to user controls by admin
 # schemes:
@@ -22,7 +20,6 @@ paths:
   /admin/users:
     get:
       tags:
-        - admin
         - users
       summary: Show all users
       description: Returns an array of all UserInfo
@@ -41,7 +38,6 @@ paths:
   /admin/users/{UID}:
     get:
       tags:
-        - admin
         - users
       summary: Show userinfo by UID
       description: Returns a UserInfo object
@@ -68,7 +64,6 @@ paths:
           description: internal error
     post:
       tags:
-        - admin
         - users
       summary: Updates the userinfo of the specified user, if the user does not exist, then a new user is created
       operationId: writeUserInfo
@@ -100,7 +95,6 @@ paths:
           description: internal error
     delete:
       tags:
-        - admin
         - users
       summary: Deletes a user
       operationId: deleteUser

internal/server/usermanager/api_router_test.go

@@ -4,12 +4,13 @@ import (
 	"bytes"
 	"encoding/base64"
 	"encoding/json"
-	"github.com/stretchr/testify/assert"
 	"io/ioutil"
 	"net/http"
 	"net/http/httptest"
 	"os"
 	"testing"
+
+	"github.com/stretchr/testify/assert"
 )
 
 var mockUIDb64 = base64.URLEncoding.EncodeToString(mockUID)
@@ -46,6 +47,36 @@ func TestWriteUserInfoHlr(t *testing.T) {
 		assert.Equalf(t, http.StatusCreated, rr.Code, "response body: %v", rr.Body)
 	})
 
+	t.Run("partial update", func(t *testing.T) {
+		req, err := http.NewRequest("POST", "/admin/users/"+mockUIDb64, bytes.NewBuffer(marshalled))
+		assert.NoError(t, err)
+		rr := httptest.NewRecorder()
+		router.ServeHTTP(rr, req)
+		assert.Equal(t, http.StatusCreated, rr.Code)
+
+		partialUserInfo := UserInfo{
+			UID:         mockUID,
+			SessionsCap: JustInt32(10),
+		}
+		partialMarshalled, _ := json.Marshal(partialUserInfo)
+		req, err = http.NewRequest("POST", "/admin/users/"+mockUIDb64, bytes.NewBuffer(partialMarshalled))
+		assert.NoError(t, err)
+		router.ServeHTTP(rr, req)
+		assert.Equal(t, http.StatusCreated, rr.Code)
+
+		req, err = http.NewRequest("GET", "/admin/users/"+mockUIDb64, nil)
+		assert.NoError(t, err)
+		router.ServeHTTP(rr, req)
+		assert.Equal(t, http.StatusCreated, rr.Code)
+		var got UserInfo
+		err = json.Unmarshal(rr.Body.Bytes(), &got)
+		assert.NoError(t, err)
+
+		expected := mockUserInfo
+		expected.SessionsCap = partialUserInfo.SessionsCap
+		assert.EqualValues(t, expected, got)
+	})
+
 	t.Run("empty parameter", func(t *testing.T) {
 		req, err := http.NewRequest("POST", "/admin/users/", bytes.NewBuffer(marshalled))
 		if err != nil {

internal/server/usermanager/localmanager.go

@@ -2,6 +2,7 @@ package usermanager
 
 import (
 	"encoding/binary"
+
 	"github.com/cbeuw/Cloak/internal/common"
 	log "github.com/sirupsen/logrus"
 	bolt "go.etcd.io/bbolt"
@@ -127,6 +128,7 @@ func (manager *localManager) UploadStatus(uploads []StatusUpdate) ([]StatusRespo
 					"User no longer exists",
 				}
 				responses = append(responses, resp)
+				continue
 			}
 
 			oldUp := int64(u64(bucket.Get([]byte("UpCredit"))))
@@ -179,17 +181,20 @@ func (manager *localManager) ListAllUsers() (infos []UserInfo, err error) {
 		err = tx.ForEach(func(UID []byte, bucket *bolt.Bucket) error {
 			var uinfo UserInfo
 			uinfo.UID = UID
-			uinfo.SessionsCap = int32(u32(bucket.Get([]byte("SessionsCap"))))
+			uinfo.SessionsCap = JustInt32(int32(u32(bucket.Get([]byte("SessionsCap")))))
-			uinfo.UpRate = int64(u64(bucket.Get([]byte("UpRate"))))
+			uinfo.UpRate = JustInt64(int64(u64(bucket.Get([]byte("UpRate")))))
-			uinfo.DownRate = int64(u64(bucket.Get([]byte("DownRate"))))
+			uinfo.DownRate = JustInt64(int64(u64(bucket.Get([]byte("DownRate")))))
-			uinfo.UpCredit = int64(u64(bucket.Get([]byte("UpCredit"))))
+			uinfo.UpCredit = JustInt64(int64(u64(bucket.Get([]byte("UpCredit")))))
-			uinfo.DownCredit = int64(u64(bucket.Get([]byte("DownCredit"))))
+			uinfo.DownCredit = JustInt64(int64(u64(bucket.Get([]byte("DownCredit")))))
-			uinfo.ExpiryTime = int64(u64(bucket.Get([]byte("ExpiryTime"))))
+			uinfo.ExpiryTime = JustInt64(int64(u64(bucket.Get([]byte("ExpiryTime")))))
 			infos = append(infos, uinfo)
 			return nil
 		})
 		return err
 	})
+	if infos == nil {
+		infos = []UserInfo{}
+	}
 	return
 }
 
@@ -200,40 +205,52 @@ func (manager *localManager) GetUserInfo(UID []byte) (uinfo UserInfo, err error)
 			return ErrUserNotFound
 		}
 		uinfo.UID = UID
-		uinfo.SessionsCap = int32(u32(bucket.Get([]byte("SessionsCap"))))
+		uinfo.SessionsCap = JustInt32(int32(u32(bucket.Get([]byte("SessionsCap")))))
-		uinfo.UpRate = int64(u64(bucket.Get([]byte("UpRate"))))
+		uinfo.UpRate = JustInt64(int64(u64(bucket.Get([]byte("UpRate")))))
-		uinfo.DownRate = int64(u64(bucket.Get([]byte("DownRate"))))
+		uinfo.DownRate = JustInt64(int64(u64(bucket.Get([]byte("DownRate")))))
-		uinfo.UpCredit = int64(u64(bucket.Get([]byte("UpCredit"))))
+		uinfo.UpCredit = JustInt64(int64(u64(bucket.Get([]byte("UpCredit")))))
-		uinfo.DownCredit = int64(u64(bucket.Get([]byte("DownCredit"))))
+		uinfo.DownCredit = JustInt64(int64(u64(bucket.Get([]byte("DownCredit")))))
-		uinfo.ExpiryTime = int64(u64(bucket.Get([]byte("ExpiryTime"))))
+		uinfo.ExpiryTime = JustInt64(int64(u64(bucket.Get([]byte("ExpiryTime")))))
 		return nil
 	})
 	return
 }
 
-func (manager *localManager) WriteUserInfo(uinfo UserInfo) (err error) {
+func (manager *localManager) WriteUserInfo(u UserInfo) (err error) {
 	err = manager.db.Update(func(tx *bolt.Tx) error {
-		bucket, err := tx.CreateBucketIfNotExists(uinfo.UID)
+		bucket, err := tx.CreateBucketIfNotExists(u.UID)
 		if err != nil {
 			return err
 		}
-		if err = bucket.Put([]byte("SessionsCap"), i32ToB(int32(uinfo.SessionsCap))); err != nil {
+		if u.SessionsCap != nil {
-			return err
+			if err = bucket.Put([]byte("SessionsCap"), i32ToB(*u.SessionsCap)); err != nil {
+				return err
+			}
 		}
-		if err = bucket.Put([]byte("UpRate"), i64ToB(uinfo.UpRate)); err != nil {
+		if u.UpRate != nil {
-			return err
+			if err = bucket.Put([]byte("UpRate"), i64ToB(*u.UpRate)); err != nil {
+				return err
+			}
 		}
-		if err = bucket.Put([]byte("DownRate"), i64ToB(uinfo.DownRate)); err != nil {
+		if u.DownRate != nil {
-			return err
+			if err = bucket.Put([]byte("DownRate"), i64ToB(*u.DownRate)); err != nil {
+				return err
+			}
 		}
-		if err = bucket.Put([]byte("UpCredit"), i64ToB(uinfo.UpCredit)); err != nil {
+		if u.UpCredit != nil {
-			return err
+			if err = bucket.Put([]byte("UpCredit"), i64ToB(*u.UpCredit)); err != nil {
+				return err
+			}
 		}
-		if err = bucket.Put([]byte("DownCredit"), i64ToB(uinfo.DownCredit)); err != nil {
+		if u.DownCredit != nil {
-			return err
+			if err = bucket.Put([]byte("DownCredit"), i64ToB(*u.DownCredit)); err != nil {
+				return err
+			}
 		}
-		if err = bucket.Put([]byte("ExpiryTime"), i64ToB(uinfo.ExpiryTime)); err != nil {
+		if u.ExpiryTime != nil {
-			return err
+			if err = bucket.Put([]byte("ExpiryTime"), i64ToB(*u.ExpiryTime)); err != nil {
+				return err
+			}
 		}
 		return nil
 	})

internal/server/usermanager/localmanager_test.go

@@ -2,7 +2,6 @@ package usermanager
 
 import (
 	"encoding/binary"
-	"github.com/cbeuw/Cloak/internal/common"
 	"io/ioutil"
 	"math/rand"
 	"os"
@@ -11,18 +10,21 @@ import (
 	"sync"
 	"testing"
 	"time"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/stretchr/testify/assert"
 )
 
 var mockUID = []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
 var mockWorldState = common.WorldOfTime(time.Unix(1, 0))
 var mockUserInfo = UserInfo{
 	UID:         mockUID,
-	SessionsCap: 0,
+	SessionsCap: JustInt32(10),
-	UpRate:      0,
+	UpRate:      JustInt64(100),
-	DownRate:    0,
+	DownRate:    JustInt64(1000),
-	UpCredit:    0,
+	UpCredit:    JustInt64(10000),
-	DownCredit:  0,
+	DownCredit:  JustInt64(100000),
-	ExpiryTime:  100,
+	ExpiryTime:  JustInt64(1000000),
 }
 
 func makeManager(t *testing.T) (mgr *localManager, cleaner func()) {
@@ -43,6 +45,23 @@ func TestLocalManager_WriteUserInfo(t *testing.T) {
 	if err != nil {
 		t.Error(err)
 	}
+
+	got, err := mgr.GetUserInfo(mockUID)
+	assert.NoError(t, err)
+	assert.EqualValues(t, mockUserInfo, got)
+
+	/* Partial update */
+	err = mgr.WriteUserInfo(UserInfo{
+		UID:         mockUID,
+		SessionsCap: JustInt32(*mockUserInfo.SessionsCap + 1),
+	})
+	assert.NoError(t, err)
+
+	expected := mockUserInfo
+	expected.SessionsCap = JustInt32(*mockUserInfo.SessionsCap + 1)
+	got, err = mgr.GetUserInfo(mockUID)
+	assert.NoError(t, err)
+	assert.EqualValues(t, expected, got)
 }
 
 func TestLocalManager_GetUserInfo(t *testing.T) {
@@ -63,7 +82,7 @@ func TestLocalManager_GetUserInfo(t *testing.T) {
 	t.Run("update a field", func(t *testing.T) {
 		_ = mgr.WriteUserInfo(mockUserInfo)
 		updatedUserInfo := mockUserInfo
-		updatedUserInfo.SessionsCap = mockUserInfo.SessionsCap + 1
+		updatedUserInfo.SessionsCap = JustInt32(*mockUserInfo.SessionsCap + 1)
 
 		err := mgr.WriteUserInfo(updatedUserInfo)
 		if err != nil {
@@ -103,15 +122,7 @@ func TestLocalManager_DeleteUser(t *testing.T) {
 	}
 }
 
-var validUserInfo = UserInfo{
+var validUserInfo = mockUserInfo
-	UID:         mockUID,
-	SessionsCap: 10,
-	UpRate:      100,
-	DownRate:    1000,
-	UpCredit:    10000,
-	DownCredit:  100000,
-	ExpiryTime:  1000000,
-}
 
 func TestLocalManager_AuthenticateUser(t *testing.T) {
 	var tmpDB, _ = ioutil.TempFile("", "ck_user_info")
@@ -128,7 +139,7 @@ func TestLocalManager_AuthenticateUser(t *testing.T) {
 			t.Error(err)
 		}
 
-		if upRate != validUserInfo.UpRate || downRate != validUserInfo.DownRate {
+		if upRate != *validUserInfo.UpRate || downRate != *validUserInfo.DownRate {
 			t.Error("wrong up or down rate")
 		}
 	})
@@ -142,7 +153,7 @@ func TestLocalManager_AuthenticateUser(t *testing.T) {
 
 	t.Run("expired user", func(t *testing.T) {
 		expiredUserInfo := validUserInfo
-		expiredUserInfo.ExpiryTime = mockWorldState.Now().Add(-10 * time.Second).Unix()
+		expiredUserInfo.ExpiryTime = JustInt64(mockWorldState.Now().Add(-10 * time.Second).Unix())
 
 		_ = mgr.WriteUserInfo(expiredUserInfo)
 
@@ -154,7 +165,7 @@ func TestLocalManager_AuthenticateUser(t *testing.T) {
 
 	t.Run("no credit", func(t *testing.T) {
 		creditlessUserInfo := validUserInfo
-		creditlessUserInfo.UpCredit, creditlessUserInfo.DownCredit = -1, -1
+		creditlessUserInfo.UpCredit, creditlessUserInfo.DownCredit = JustInt64(-1), JustInt64(-1)
 
 		_ = mgr.WriteUserInfo(creditlessUserInfo)
 
@@ -186,7 +197,7 @@ func TestLocalManager_AuthoriseNewSession(t *testing.T) {
 
 	t.Run("expired user", func(t *testing.T) {
 		expiredUserInfo := validUserInfo
-		expiredUserInfo.ExpiryTime = mockWorldState.Now().Add(-10 * time.Second).Unix()
+		expiredUserInfo.ExpiryTime = JustInt64(mockWorldState.Now().Add(-10 * time.Second).Unix())
 
 		_ = mgr.WriteUserInfo(expiredUserInfo)
 		err := mgr.AuthoriseNewSession(expiredUserInfo.UID, AuthorisationInfo{NumExistingSessions: 0})
@@ -197,7 +208,7 @@ func TestLocalManager_AuthoriseNewSession(t *testing.T) {
 
 	t.Run("too many sessions", func(t *testing.T) {
 		_ = mgr.WriteUserInfo(validUserInfo)
-		err := mgr.AuthoriseNewSession(validUserInfo.UID, AuthorisationInfo{NumExistingSessions: int(validUserInfo.SessionsCap + 1)})
+		err := mgr.AuthoriseNewSession(validUserInfo.UID, AuthorisationInfo{NumExistingSessions: int(*validUserInfo.SessionsCap + 1)})
 		if err != ErrSessionsCapReached {
 			t.Error("session cap not reached")
 		}
@@ -230,10 +241,10 @@ func TestLocalManager_UploadStatus(t *testing.T) {
 			t.Error(err)
 		}
 
-		if updatedUserInfo.UpCredit != validUserInfo.UpCredit-update.UpUsage {
+		if *updatedUserInfo.UpCredit != *validUserInfo.UpCredit-update.UpUsage {
 			t.Error("up usage incorrect")
 		}
-		if updatedUserInfo.DownCredit != validUserInfo.DownCredit-update.DownUsage {
+		if *updatedUserInfo.DownCredit != *validUserInfo.DownCredit-update.DownUsage {
 			t.Error("down usage incorrect")
 		}
 	})
@@ -249,7 +260,7 @@ func TestLocalManager_UploadStatus(t *testing.T) {
 				UID:        validUserInfo.UID,
 				Active:     true,
 				NumSession: 1,
-				UpUsage:    validUserInfo.UpCredit + 100,
+				UpUsage:    *validUserInfo.UpCredit + 100,
 				DownUsage:  0,
 				Timestamp:  mockWorldState.Now().Unix(),
 			},
@@ -261,19 +272,19 @@ func TestLocalManager_UploadStatus(t *testing.T) {
 				Active:     true,
 				NumSession: 1,
 				UpUsage:    0,
-				DownUsage:  validUserInfo.DownCredit + 100,
+				DownUsage:  *validUserInfo.DownCredit + 100,
 				Timestamp:  mockWorldState.Now().Unix(),
 			},
 		},
 		{"expired",
 			UserInfo{
 				UID:         mockUID,
-				SessionsCap: 10,
+				SessionsCap: JustInt32(10),
-				UpRate:      0,
+				UpRate:      JustInt64(0),
-				DownRate:    0,
+				DownRate:    JustInt64(0),
-				UpCredit:    0,
+				UpCredit:    JustInt64(0),
-				DownCredit:  0,
+				DownCredit:  JustInt64(0),
-				ExpiryTime:  -1,
+				ExpiryTime:  JustInt64(-1),
 			},
 			StatusUpdate{
 				UID:        mockUserInfo.UID,
@@ -318,12 +329,12 @@ func TestLocalManager_ListAllUsers(t *testing.T) {
 		rand.Read(randUID)
 		newUser := UserInfo{
 			UID:         randUID,
-			SessionsCap: rand.Int31(),
+			SessionsCap: JustInt32(rand.Int31()),
-			UpRate:      rand.Int63(),
+			UpRate:      JustInt64(rand.Int63()),
-			DownRate:    rand.Int63(),
+			DownRate:    JustInt64(rand.Int63()),
-			UpCredit:    rand.Int63(),
+			UpCredit:    JustInt64(rand.Int63()),
-			DownCredit:  rand.Int63(),
+			DownCredit:  JustInt64(rand.Int63()),
-			ExpiryTime:  rand.Int63(),
+			ExpiryTime:  JustInt64(rand.Int63()),
 		}
 		users = append(users, newUser)
 		wg.Add(1)

internal/server/usermanager/usermanager.go

@@ -14,16 +14,23 @@ type StatusUpdate struct {
 	Timestamp int64
 }
 
+type MaybeInt32 *int32
+type MaybeInt64 *int64
+
 type UserInfo struct {
 	UID         []byte
-	SessionsCap int32
+	SessionsCap MaybeInt32
-	UpRate      int64
+	UpRate      MaybeInt64
-	DownRate    int64
+	DownRate    MaybeInt64
-	UpCredit    int64
+	UpCredit    MaybeInt64
-	DownCredit  int64
+	DownCredit  MaybeInt64
-	ExpiryTime  int64
+	ExpiryTime  MaybeInt64
 }
 
+func JustInt32(v int32) MaybeInt32 { return &v }
+
+func JustInt64(v int64) MaybeInt64 { return &v }
+
 type StatusResponse struct {
 	UID     []byte
 	Action  int
@@ -40,6 +47,7 @@ const (
 
 var ErrUserNotFound = errors.New("UID does not correspond to a user")
 var ErrSessionsCapReached = errors.New("Sessions cap has reached")
+var ErrMangerIsVoid = errors.New("cannot perform operation with user manager as database path is not specified")
 
 var ErrNoUpCredit = errors.New("No upload credit left")
 var ErrNoDownCredit = errors.New("No download credit left")

internal/server/usermanager/voidmanager.go

@@ -0,0 +1,31 @@
+package usermanager
+
+type Voidmanager struct{}
+
+func (v *Voidmanager) AuthenticateUser(bytes []byte) (int64, int64, error) {
+	return 0, 0, ErrMangerIsVoid
+}
+
+func (v *Voidmanager) AuthoriseNewSession(bytes []byte, info AuthorisationInfo) error {
+	return ErrMangerIsVoid
+}
+
+func (v *Voidmanager) UploadStatus(updates []StatusUpdate) ([]StatusResponse, error) {
+	return nil, ErrMangerIsVoid
+}
+
+func (v *Voidmanager) ListAllUsers() ([]UserInfo, error) {
+	return []UserInfo{}, ErrMangerIsVoid
+}
+
+func (v *Voidmanager) GetUserInfo(UID []byte) (UserInfo, error) {
+	return UserInfo{}, ErrMangerIsVoid
+}
+
+func (v *Voidmanager) WriteUserInfo(info UserInfo) error {
+	return ErrMangerIsVoid
+}
+
+func (v *Voidmanager) DeleteUser(UID []byte) error {
+	return ErrMangerIsVoid
+}

internal/server/usermanager/voidmanager_test.go

@@ -0,0 +1,44 @@
+package usermanager
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/assert"
+)
+
+var v = &Voidmanager{}
+
+func Test_Voidmanager_AuthenticateUser(t *testing.T) {
+	_, _, err := v.AuthenticateUser([]byte{})
+	assert.Equal(t, ErrMangerIsVoid, err)
+}
+
+func Test_Voidmanager_AuthoriseNewSession(t *testing.T) {
+	err := v.AuthoriseNewSession([]byte{}, AuthorisationInfo{})
+	assert.Equal(t, ErrMangerIsVoid, err)
+}
+
+func Test_Voidmanager_DeleteUser(t *testing.T) {
+	err := v.DeleteUser([]byte{})
+	assert.Equal(t, ErrMangerIsVoid, err)
+}
+
+func Test_Voidmanager_GetUserInfo(t *testing.T) {
+	_, err := v.GetUserInfo([]byte{})
+	assert.Equal(t, ErrMangerIsVoid, err)
+}
+
+func Test_Voidmanager_ListAllUsers(t *testing.T) {
+	_, err := v.ListAllUsers()
+	assert.Equal(t, ErrMangerIsVoid, err)
+}
+
+func Test_Voidmanager_UploadStatus(t *testing.T) {
+	_, err := v.UploadStatus([]StatusUpdate{})
+	assert.Equal(t, ErrMangerIsVoid, err)
+}
+
+func Test_Voidmanager_WriteUserInfo(t *testing.T) {
+	err := v.WriteUserInfo(UserInfo{})
+	assert.Equal(t, ErrMangerIsVoid, err)
+}

internal/server/userpanel.go

@@ -2,11 +2,12 @@ package server
 
 import (
 	"encoding/base64"
-	"github.com/cbeuw/Cloak/internal/server/usermanager"
 	"sync"
 	"sync/atomic"
 	"time"
 
+	"github.com/cbeuw/Cloak/internal/server/usermanager"
+
 	mux "github.com/cbeuw/Cloak/internal/multiplex"
 	log "github.com/sirupsen/logrus"
 )
@@ -185,6 +186,9 @@ func (panel *userPanel) commitUpdate() error {
 	panel.usageUpdateQueue = make(map[[16]byte]*usagePair)
 	panel.usageUpdateQueueM.Unlock()
 
+	if len(statuses) == 0 {
+		return nil
+	}
 	responses, err := panel.Manager.UploadStatus(statuses)
 	if err != nil {
 		return err

internal/server/userpanel_test.go

@@ -2,12 +2,13 @@ package server
 
 import (
 	"encoding/base64"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/cbeuw/Cloak/internal/server/usermanager"
 	"io/ioutil"
 	"os"
 	"testing"
 	"time"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/cbeuw/Cloak/internal/server/usermanager"
 )
 
 func TestUserPanel_BypassUser(t *testing.T) {
@@ -66,12 +67,12 @@ var mockUID = []byte{0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15}
 var mockWorldState = common.WorldOfTime(time.Unix(1, 0))
 var validUserInfo = usermanager.UserInfo{
 	UID:         mockUID,
-	SessionsCap: 10,
+	SessionsCap: usermanager.JustInt32(10),
-	UpRate:      100,
+	UpRate:      usermanager.JustInt64(100),
-	DownRate:    1000,
+	DownRate:    usermanager.JustInt64(1000),
-	UpCredit:    10000,
+	UpCredit:    usermanager.JustInt64(10000),
-	DownCredit:  100000,
+	DownCredit:  usermanager.JustInt64(100000),
-	ExpiryTime:  1000000,
+	ExpiryTime:  usermanager.JustInt64(1000000),
 }
 
 func TestUserPanel_GetUser(t *testing.T) {
@@ -138,10 +139,10 @@ func TestUserPanel_UpdateUsageQueue(t *testing.T) {
 		}
 
 		updatedUinfo, _ := mgr.GetUserInfo(validUserInfo.UID)
-		if updatedUinfo.DownCredit != validUserInfo.DownCredit-1 {
+		if *updatedUinfo.DownCredit != *validUserInfo.DownCredit-1 {
 			t.Error("down credit incorrect update")
 		}
-		if updatedUinfo.UpCredit != validUserInfo.UpCredit-2 {
+		if *updatedUinfo.UpCredit != *validUserInfo.UpCredit-2 {
 			t.Error("up credit incorrect update")
 		}
 
@@ -155,10 +156,10 @@ func TestUserPanel_UpdateUsageQueue(t *testing.T) {
 		}
 
 		updatedUinfo, _ = mgr.GetUserInfo(validUserInfo.UID)
-		if updatedUinfo.DownCredit != validUserInfo.DownCredit-(1+3) {
+		if *updatedUinfo.DownCredit != *validUserInfo.DownCredit-(1+3) {
 			t.Error("down credit incorrect update")
 		}
-		if updatedUinfo.UpCredit != validUserInfo.UpCredit-(2+4) {
+		if *updatedUinfo.UpCredit != *validUserInfo.UpCredit-(2+4) {
 			t.Error("up credit incorrect update")
 		}
 	})
@@ -170,7 +171,7 @@ func TestUserPanel_UpdateUsageQueue(t *testing.T) {
 			t.Error(err)
 		}
 
-		user.valve.AddTx(validUserInfo.DownCredit + 100)
+		user.valve.AddTx(*validUserInfo.DownCredit + 100)
 		panel.updateUsageQueue()
 		err = panel.commitUpdate()
 		if err != nil {
@@ -182,7 +183,7 @@ func TestUserPanel_UpdateUsageQueue(t *testing.T) {
 		}
 
 		updatedUinfo, _ := mgr.GetUserInfo(validUserInfo.UID)
-		if updatedUinfo.DownCredit != -100 {
+		if *updatedUinfo.DownCredit != -100 {
 			t.Error("down credit not updated correctly after the user has been terminated")
 		}
 	})

internal/server/websocket.go

@@ -7,11 +7,12 @@ import (
 	"encoding/base64"
 	"errors"
 	"fmt"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/cbeuw/Cloak/internal/ecdh"
 	"io"
 	"net"
 	"net/http"
+
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/cbeuw/Cloak/internal/ecdh"
 )
 
 type WebSocket struct{}
@@ -84,7 +85,13 @@ func (WebSocket) unmarshalHidden(hidden []byte, staticPv crypto.PrivateKey) (fra
 		return
 	}
 
-	copy(fragments.sharedSecret[:], ecdh.GenerateSharedSecret(staticPv, ephPub))
+	var sharedSecret []byte
+	sharedSecret, err = ecdh.GenerateSharedSecret(staticPv, ephPub)
+	if err != nil {
+		return
+	}
+
+	copy(fragments.sharedSecret[:], sharedSecret)
 
 	if len(hidden[32:]) != 64 {
 		err = fmt.Errorf("%v: %v", ErrCiphertextLength, len(hidden[32:]))

internal/server/websocketAux.go

@@ -2,11 +2,12 @@ package server
 
 import (
 	"errors"
-	"github.com/cbeuw/Cloak/internal/common"
-	"github.com/gorilla/websocket"
 	"net"
 	"net/http"
 
+	"github.com/cbeuw/Cloak/internal/common"
+	"github.com/gorilla/websocket"
+
 	log "github.com/sirupsen/logrus"
 )
 

internal/server/websocketAux_test.go

@@ -2,8 +2,9 @@ package server
 
 import (
 	"bytes"
-	"github.com/cbeuw/connutil"
 	"testing"
+
+	"github.com/cbeuw/connutil"
 )
 
 func TestFirstBuffedConn_Read(t *testing.T) {

internal/test/integration_test.go

@@ -5,26 +5,24 @@ import (
 	"encoding/base64"
 	"encoding/binary"
 	"fmt"
+	"io"
+	"math/rand"
+	"net"
+	"sync"
+	"testing"
+	"time"
+
 	"github.com/cbeuw/Cloak/internal/client"
 	"github.com/cbeuw/Cloak/internal/common"
 	mux "github.com/cbeuw/Cloak/internal/multiplex"
 	"github.com/cbeuw/Cloak/internal/server"
 	"github.com/cbeuw/connutil"
-	"io"
+	"github.com/stretchr/testify/assert"
-	"io/ioutil"
-	"math/rand"
-	"net"
-	"os"
-	"sync"
-	"testing"
-	"time"
 
 	log "github.com/sirupsen/logrus"
 )
 
 const numConns = 200 // -race option limits the number of goroutines to 8192
-const delayBeforeTestingConnClose = 500 * time.Millisecond
-const connCloseRetries = 3
 
 func serveTCPEcho(l net.Listener) {
 	for {
@@ -33,15 +31,14 @@ func serveTCPEcho(l net.Listener) {
 			log.Error(err)
 			return
 		}
-		go func() {
+		go func(conn net.Conn) {
-			conn := conn
 			_, err := io.Copy(conn, conn)
 			if err != nil {
 				conn.Close()
 				log.Error(err)
 				return
 			}
-		}()
+		}(conn)
 	}
 }
 
@@ -53,8 +50,7 @@ func serveUDPEcho(listener *connutil.PipeListener) {
 			return
 		}
 		const bufSize = 32 * 1024
-		go func() {
+		go func(conn net.PacketConn) {
-			conn := conn
 			defer conn.Close()
 			buf := make([]byte, bufSize)
 			for {
@@ -73,7 +69,7 @@ func serveUDPEcho(listener *connutil.PipeListener) {
 					return
 				}
 			}
-		}()
+		}(conn)
 	}
 }
 
@@ -125,7 +121,7 @@ var singleplexTCPConfig = client.RawConfig{
 	RemotePort:       "9999",
 	LocalHost:        "127.0.0.1",
 	LocalPort:        "9999",
-	BrowserSig:       "chrome",
+	BrowserSig:       "safari",
 }
 
 func generateClientConfigs(rawConfig client.RawConfig, state common.WorldState) (client.LocalConnConfig, client.RemoteConnConfig, client.AuthInfo) {
@@ -136,18 +132,15 @@ func generateClientConfigs(rawConfig client.RawConfig, state common.WorldState)
 	return lcl, rmt, auth
 }
 
-func basicServerState(ws common.WorldState, db *os.File) *server.State {
+func basicServerState(ws common.WorldState) *server.State {
 	var serverConfig = server.RawConfig{
-		ProxyBook:     map[string][]string{"shadowsocks": {"tcp", "fake.com:9999"}, "openvpn": {"udp", "fake.com:9999"}},
+		ProxyBook:  map[string][]string{"shadowsocks": {"tcp", "fake.com:9999"}, "openvpn": {"udp", "fake.com:9999"}},
-		BindAddr:      []string{"fake.com:9999"},
+		BindAddr:   []string{"fake.com:9999"},
-		BypassUID:     [][]byte{bypassUID[:]},
+		BypassUID:  [][]byte{bypassUID[:]},
-		RedirAddr:     "fake.com:9999",
+		RedirAddr:  "fake.com:9999",
-		PrivateKey:    privateKey,
+		PrivateKey: privateKey,
-		AdminUID:      nil,
+		KeepAlive:  15,
-		DatabasePath:  db.Name(),
+		CncMode:    false,
-		StreamTimeout: 300,
-		KeepAlive:     15,
-		CncMode:       false,
 	}
 	state, err := server.InitState(serverConfig, ws)
 	if err != nil {
@@ -186,7 +179,9 @@ func establishSession(lcc client.LocalConnConfig, rcc client.RemoteConnConfig, a
 	//									whatever connection initiator (including a proper ck-client)
 
 	netToCkServerD, ckServerListener := connutil.DialerListener(10 * 1024)
+
 	clientSeshMaker := func() *mux.Session {
+		ai := ai
 		quad := make([]byte, 4)
 		common.RandRead(ai.WorldState.Rand, quad)
 		ai.SessionId = binary.BigEndian.Uint32(quad)
@@ -207,12 +202,12 @@ func establishSession(lcc client.LocalConnConfig, rcc client.RemoteConnConfig, a
 			addrCh <- conn.LocalAddr().(*net.UDPAddr)
 			return conn, err
 		}
-		go client.RouteUDP(acceptor, lcc.Timeout, clientSeshMaker)
+		go client.RouteUDP(acceptor, lcc.Timeout, rcc.Singleplex, clientSeshMaker)
 		proxyToCkClientD = mDialer
 	} else {
 		var proxyToCkClientL *connutil.PipeListener
 		proxyToCkClientD, proxyToCkClientL = connutil.DialerListener(10 * 1024)
-		go client.RouteTCP(proxyToCkClientL, lcc.Timeout, clientSeshMaker)
+		go client.RouteTCP(proxyToCkClientL, lcc.Timeout, rcc.Singleplex, clientSeshMaker)
 	}
 
 	// set up server
@@ -226,43 +221,46 @@ func establishSession(lcc client.LocalConnConfig, rcc client.RemoteConnConfig, a
 	return proxyToCkClientD, proxyFromCkServerL, netToCkServerD, redirFromCkServerL, nil
 }
 
-func runEchoTest(t *testing.T, conns []net.Conn, maxMsgLen int) {
+func runEchoTest(t *testing.T, conns []net.Conn, msgLen int) {
 	var wg sync.WaitGroup
+
 	for _, conn := range conns {
 		wg.Add(1)
 		go func(conn net.Conn) {
-			testDataLen := rand.Intn(maxMsgLen)
+			defer wg.Done()
-			testData := make([]byte, testDataLen)
+
+			testData := make([]byte, msgLen)
 			rand.Read(testData)
 
+			// we cannot call t.Fatalf in concurrent contexts
 			n, err := conn.Write(testData)
-			if n != testDataLen {
+			if n != msgLen {
-				t.Fatalf("written only %v, err %v", n, err)
+				t.Errorf("written only %v, err %v", n, err)
+				return
 			}
 
-			recvBuf := make([]byte, testDataLen)
+			recvBuf := make([]byte, msgLen)
 			_, err = io.ReadFull(conn, recvBuf)
 			if err != nil {
-				t.Fatalf("failed to read back: %v", err)
+				t.Errorf("failed to read back: %v", err)
+				return
 			}
 
 			if !bytes.Equal(testData, recvBuf) {
-				t.Fatalf("echoed data not correct")
+				t.Errorf("echoed data not correct")
+				return
 			}
-			wg.Done()
 		}(conn)
 	}
 	wg.Wait()
 }
 
 func TestUDP(t *testing.T) {
-	var tmpDB, _ = ioutil.TempFile("", "ck_user_info")
-	defer os.Remove(tmpDB.Name())
 	log.SetLevel(log.ErrorLevel)
 
 	worldState := common.WorldOfTime(time.Unix(10, 0))
 	lcc, rcc, ai := generateClientConfigs(basicUDPConfig, worldState)
-	sta := basicServerState(worldState, tmpDB)
+	sta := basicServerState(worldState)
 
 	proxyToCkClientD, proxyFromCkServerL, _, _, err := establishSession(lcc, rcc, ai, sta)
 	if err != nil {
@@ -300,6 +298,7 @@ func TestUDP(t *testing.T) {
 		}
 	})
 
+	const echoMsgLen = 1024
 	t.Run("user echo", func(t *testing.T) {
 		go serveUDPEcho(proxyFromCkServerL)
 		var conn [1]net.Conn
@@ -308,7 +307,7 @@ func TestUDP(t *testing.T) {
 			t.Error(err)
 		}
 
-		runEchoTest(t, conn[:], 1024)
+		runEchoTest(t, conn[:], echoMsgLen)
 	})
 
 }
@@ -317,21 +316,20 @@ func TestTCPSingleplex(t *testing.T) {
 	log.SetLevel(log.ErrorLevel)
 	worldState := common.WorldOfTime(time.Unix(10, 0))
 	lcc, rcc, ai := generateClientConfigs(singleplexTCPConfig, worldState)
-	var tmpDB, _ = ioutil.TempFile("", "ck_user_info")
+	sta := basicServerState(worldState)
-	defer os.Remove(tmpDB.Name())
-	sta := basicServerState(worldState, tmpDB)
 	proxyToCkClientD, proxyFromCkServerL, _, _, err := establishSession(lcc, rcc, ai, sta)
 	if err != nil {
 		t.Fatal(err)
 	}
 
+	const echoMsgLen = 1 << 16
 	go serveTCPEcho(proxyFromCkServerL)
 
 	proxyConn1, err := proxyToCkClientD.Dial("", "")
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
 	}
-	runEchoTest(t, []net.Conn{proxyConn1}, 65536)
+	runEchoTest(t, []net.Conn{proxyConn1}, echoMsgLen)
 	user, err := sta.Panel.GetUser(ai.UID[:])
 	if err != nil {
 		t.Fatalf("failed to fetch user: %v", err)
@@ -343,42 +341,34 @@ func TestTCPSingleplex(t *testing.T) {
 
 	proxyConn2, err := proxyToCkClientD.Dial("", "")
 	if err != nil {
-		t.Error(err)
+		t.Fatal(err)
 	}
-	runEchoTest(t, []net.Conn{proxyConn2}, 65536)
+	runEchoTest(t, []net.Conn{proxyConn2}, echoMsgLen)
 	if user.NumSession() != 2 {
 		t.Error("no extra session were made on second connection establishment")
 	}
 
 	// Both conns should work
-	runEchoTest(t, []net.Conn{proxyConn1, proxyConn2}, 65536)
+	runEchoTest(t, []net.Conn{proxyConn1, proxyConn2}, echoMsgLen)
 
 	proxyConn1.Close()
 
-	retries := 0
+	assert.Eventually(t, func() bool {
-retry:
+		return user.NumSession() == 1
-	time.Sleep(delayBeforeTestingConnClose)
+	}, time.Second, 10*time.Millisecond, "first session was not closed on connection close")
-	if user.NumSession() != 1 {
-		retries++
-		if retries > connCloseRetries {
-			t.Error("first session was not closed on connection close")
-		} else {
-			goto retry
-		}
-	}
 
 	// conn2 should still work
-	runEchoTest(t, []net.Conn{proxyConn2}, 65536)
+	runEchoTest(t, []net.Conn{proxyConn2}, echoMsgLen)
 
 	var conns [numConns]net.Conn
 	for i := 0; i < numConns; i++ {
 		conns[i], err = proxyToCkClientD.Dial("", "")
 		if err != nil {
-			t.Error(err)
+			t.Fatal(err)
 		}
 	}
 
-	runEchoTest(t, conns[:], 65536)
+	runEchoTest(t, conns[:], echoMsgLen)
 
 }
 
@@ -387,9 +377,7 @@ func TestTCPMultiplex(t *testing.T) {
 	worldState := common.WorldOfTime(time.Unix(10, 0))
 
 	lcc, rcc, ai := generateClientConfigs(basicTCPConfig, worldState)
-	var tmpDB, _ = ioutil.TempFile("", "ck_user_info")
+	sta := basicServerState(worldState)
-	defer os.Remove(tmpDB.Name())
-	sta := basicServerState(worldState, tmpDB)
 
 	proxyToCkClientD, proxyFromCkServerL, netToCkServerD, redirFromCkServerL, err := establishSession(lcc, rcc, ai, sta)
 	if err != nil {
@@ -428,6 +416,7 @@ func TestTCPMultiplex(t *testing.T) {
 		}
 	})
 
+	const echoMsgLen = 16384
 	t.Run("user echo", func(t *testing.T) {
 		go serveTCPEcho(proxyFromCkServerL)
 		var conns [numConns]net.Conn
@@ -438,7 +427,7 @@ func TestTCPMultiplex(t *testing.T) {
 			}
 		}
 
-		runEchoTest(t, conns[:], 65536)
+		runEchoTest(t, conns[:], echoMsgLen)
 	})
 
 	t.Run("redir echo", func(t *testing.T) {
@@ -450,7 +439,7 @@ func TestTCPMultiplex(t *testing.T) {
 				t.Error(err)
 			}
 		}
-		runEchoTest(t, conns[:], 65536)
+		runEchoTest(t, conns[:], echoMsgLen)
 	})
 }
 
@@ -462,11 +451,8 @@ func TestClosingStreamsFromProxy(t *testing.T) {
 		clientConfig := clientConfig
 		clientConfigName := clientConfigName
 		t.Run(clientConfigName, func(t *testing.T) {
-			var tmpDB, _ = ioutil.TempFile("", "ck_user_info")
-			defer os.Remove(tmpDB.Name())
-
 			lcc, rcc, ai := generateClientConfigs(clientConfig, worldState)
-			sta := basicServerState(worldState, tmpDB)
+			sta := basicServerState(worldState)
 			proxyToCkClientD, proxyFromCkServerL, _, _, err := establishSession(lcc, rcc, ai, sta)
 			if err != nil {
 				t.Fatal(err)
@@ -478,17 +464,10 @@ func TestClosingStreamsFromProxy(t *testing.T) {
 				serverConn, _ := proxyFromCkServerL.Accept()
 				serverConn.Close()
 
-				retries := 0
+				assert.Eventually(t, func() bool {
-			retry:
+					_, err := clientConn.Read(make([]byte, 16))
-				time.Sleep(delayBeforeTestingConnClose)
+					return err != nil
-				if _, err := clientConn.Read(make([]byte, 16)); err == nil {
+				}, time.Second, 10*time.Millisecond, "closing stream on server side is not reflected to the client")
-					retries++
-					if retries > connCloseRetries {
-						t.Errorf("closing stream on server side is not reflected to the client: %v", err)
-					} else {
-						goto retry
-					}
-				}
 			})
 
 			t.Run("closing from client", func(t *testing.T) {
@@ -498,17 +477,10 @@ func TestClosingStreamsFromProxy(t *testing.T) {
 				serverConn, _ := proxyFromCkServerL.Accept()
 				clientConn.Close()
 
-				retries := 0
+				assert.Eventually(t, func() bool {
-			retry:
+					_, err := serverConn.Read(make([]byte, 16))
-				time.Sleep(delayBeforeTestingConnClose)
+					return err != nil
-				if _, err := serverConn.Read(make([]byte, 16)); err == nil {
+				}, time.Second, 10*time.Millisecond, "closing stream on client side is not reflected to the server")
-					retries++
-					if retries > 3 {
-						t.Errorf("closing stream on client side is not reflected to the server: %v", err)
-					} else {
-						goto retry
-					}
-				}
 			})
 
 			t.Run("send then close", func(t *testing.T) {
@@ -538,19 +510,18 @@ func TestClosingStreamsFromProxy(t *testing.T) {
 	}
 }
 
-func BenchmarkThroughput(b *testing.B) {
+func BenchmarkIntegration(b *testing.B) {
-	var tmpDB, _ = ioutil.TempFile("", "ck_user_info")
-	defer os.Remove(tmpDB.Name())
 	log.SetLevel(log.ErrorLevel)
 	worldState := common.WorldOfTime(time.Unix(10, 0))
 	lcc, rcc, ai := generateClientConfigs(basicTCPConfig, worldState)
-	sta := basicServerState(worldState, tmpDB)
+	sta := basicServerState(worldState)
 	const bufSize = 16 * 1024
 
 	encryptionMethods := map[string]byte{
-		"plain":             mux.E_METHOD_PLAIN,
+		"plain":             mux.EncryptionMethodPlain,
-		"chacha20-poly1305": mux.E_METHOD_CHACHA20_POLY1305,
+		"chacha20-poly1305": mux.EncryptionMethodChaha20Poly1305,
-		"aes-gcm":           mux.E_METHOD_AES_GCM,
+		"aes-256-gcm":       mux.EncryptionMethodAES256GCM,
+		"aes-128-gcm":       mux.EncryptionMethodAES128GCM,
 	}
 
 	for name, method := range encryptionMethods {
@@ -561,7 +532,7 @@ func BenchmarkThroughput(b *testing.B) {
 				b.Fatal(err)
 			}
 
-			b.Run("single stream", func(b *testing.B) {
+			b.Run("single stream bandwidth", func(b *testing.B) {
 				more := make(chan int, 10)
 				go func() {
 					// sender
@@ -585,6 +556,19 @@ func BenchmarkThroughput(b *testing.B) {
 				}
 			})
 
+			b.Run("single stream latency", func(b *testing.B) {
+				clientConn, _ := proxyToCkClientD.Dial("", "")
+				buf := []byte{1}
+				clientConn.Write(buf)
+				serverConn, _ := proxyFromCkServerL.Accept()
+				serverConn.Read(buf)
+				b.ResetTimer()
+				for i := 0; i < b.N; i++ {
+					clientConn.Write(buf)
+					serverConn.Read(buf)
+				}
+			})
+
 		})
 	}
 

release.sh

@@ -1,15 +1,12 @@
-go get github.com/mitchellh/gox
+#!/usr/bin/env bash
+
+set -eu
+
+go install github.com/mitchellh/gox@latest
 
 mkdir -p release
 
-read -rp "Cleaning $PWD/release directory. Proceed? [y/n]" res
+rm -f ./release/*
-if [ ! "$res" == "y" ]; then
-	echo "Abort"
-	exit 1
-fi
-
-rm -rf ./release/*
-
 
 if [ -z "$v" ]; then
 	echo "Version number cannot be null. Run with v=[version] release.sh"
@@ -17,20 +14,24 @@ if [ -z "$v" ]; then
 fi
 
 output="{{.Dir}}-{{.OS}}-{{.Arch}}-$v"
-osarch="!darwin/arm !darwin/arm64 !darwin/386"
+osarch="!darwin/arm !darwin/386"
 
 echo "Compiling:"
 
 os="windows linux darwin"
 arch="amd64 386 arm arm64 mips mips64 mipsle mips64le"
-pushd cmd/ck-client || exit 1
+pushd cmd/ck-client
-gox -ldflags "-X main.version=${v}" -os="$os" -arch="$arch" -osarch="$osarch" -output="$output"
+CGO_ENABLED=0 gox -ldflags "-X main.version=${v}" -os="$os" -arch="$arch" -osarch="$osarch" -output="$output"
-GOOS="linux" GOARCH="mips" GOMIPS="softfloat" go build -ldflags "-X main.version=${v}" -o ck-client-linux-mips_softfloat-"${v}"
+CGO_ENABLED=0 GOOS="linux" GOARCH="mips" GOMIPS="softfloat" go build -ldflags "-X main.version=${v}" -o ck-client-linux-mips_softfloat-"${v}"
-GOOS="linux" GOARCH="mipsle" GOMIPS="softfloat" go build -ldflags "-X main.version=${v}" -o ck-client-linux-mipsle_softfloat-"${v}"
+CGO_ENABLED=0 GOOS="linux" GOARCH="mipsle" GOMIPS="softfloat" go build -ldflags "-X main.version=${v}" -o ck-client-linux-mipsle_softfloat-"${v}"
 mv ck-client-* ../../release
+popd
 
 os="linux"
 arch="amd64 386 arm arm64"
-pushd ../ck-server || exit 1
+pushd cmd/ck-server
-gox -ldflags "-X main.version=${v}" -os="$os" -arch="$arch" -osarch="$osarch" -output="$output"
+CGO_ENABLED=0 gox -ldflags "-X main.version=${v}" -os="$os" -arch="$arch" -osarch="$osarch" -output="$output"
 mv ck-server-* ../../release
+popd
+
+sha256sum release/*

renovate.json

@@ -0,0 +1,13 @@
+{
+  "$schema": "https://docs.renovatebot.com/renovate-schema.json",
+  "extends": [
+    "config:recommended"
+  ],
+  "packageRules": [
+    {
+      "packagePatterns": ["*"],
+      "excludePackagePatterns": ["utls"],
+      "enabled": false
+    }
+  ]
+}