mirror of https://github.com/cbeuw/Cloak
84 lines
2.5 KiB
Go
84 lines
2.5 KiB
Go
package client
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import (
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"net"
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"sync"
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"sync/atomic"
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"time"
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"github.com/cbeuw/Cloak/internal/common"
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mux "github.com/cbeuw/Cloak/internal/multiplex"
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log "github.com/sirupsen/logrus"
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)
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// On different invocations to MakeSession, authInfo.SessionId MUST be different
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func MakeSession(connConfig RemoteConnConfig, authInfo AuthInfo, dialer common.Dialer) *mux.Session {
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log.Info("Attempting to start a new session")
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connsCh := make(chan net.Conn, connConfig.NumConn)
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var _sessionKey atomic.Value
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var wg sync.WaitGroup
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for i := 0; i < connConfig.NumConn; i++ {
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wg.Add(1)
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transportConfig := connConfig.Transport
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go func() {
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makeconn:
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transportConn := transportConfig.CreateTransport()
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remoteConn, err := dialer.Dial("tcp", connConfig.RemoteAddr)
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if err != nil {
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log.Errorf("Failed to establish new connections to remote: %v", err)
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// TODO increase the interval if failed multiple times
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time.Sleep(time.Second * 3)
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goto makeconn
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}
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sk, err := transportConn.Handshake(remoteConn, authInfo)
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if err != nil {
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log.Errorf("Failed to prepare connection to remote: %v", err)
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transportConn.Close()
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// In Cloak v2.11.0, we've updated uTLS version and subsequently increased the first packet size for chrome above 1500
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// https://github.com/cbeuw/Cloak/pull/306#issuecomment-2862728738. As a backwards compatibility feature, if we fail
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// to connect using chrome signature, retry with firefox which has a smaller packet size.
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if transportConfig.mode == "direct" && transportConfig.browser == chrome {
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transportConfig.browser = firefox
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log.Warnf("failed to connect with chrome signature, falling back to retry with firefox")
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}
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time.Sleep(time.Second * 3)
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goto makeconn
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}
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// sessionKey given by each connection should be identical
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_sessionKey.Store(sk)
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connsCh <- transportConn
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wg.Done()
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}()
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}
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wg.Wait()
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log.Debug("All underlying connections established")
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sessionKey := _sessionKey.Load().([32]byte)
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obfuscator, err := mux.MakeObfuscator(authInfo.EncryptionMethod, sessionKey)
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if err != nil {
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log.Fatal(err)
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}
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seshConfig := mux.SessionConfig{
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Singleplex: connConfig.Singleplex,
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Obfuscator: obfuscator,
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Valve: nil,
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Unordered: authInfo.Unordered,
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MsgOnWireSizeLimit: appDataMaxLength,
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}
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sesh := mux.MakeSession(authInfo.SessionId, seshConfig)
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for i := 0; i < connConfig.NumConn; i++ {
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conn := <-connsCh
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sesh.AddConnection(conn)
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}
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log.Infof("Session %v established", authInfo.SessionId)
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return sesh
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}
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