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89 lines
2.3 KiB
Go
89 lines
2.3 KiB
Go
package client
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import (
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"encoding/binary"
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"net"
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"sync"
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"sync/atomic"
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"syscall"
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"time"
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mux "github.com/cbeuw/Cloak/internal/multiplex"
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"github.com/cbeuw/Cloak/internal/util"
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log "github.com/sirupsen/logrus"
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)
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type remoteConnConfig struct {
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NumConn int
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KeepAlive time.Duration
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Protector func(string, string, syscall.RawConn) error
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RemoteAddr string
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Transport Transport
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}
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func MakeSession(connConfig *remoteConnConfig, authInfo *authInfo, isAdmin bool) *mux.Session {
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log.Info("Attempting to start a new session")
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if !isAdmin {
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// sessionID is usergenerated. There shouldn't be a security concern because the scope of
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// sessionID is limited to its UID.
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quad := make([]byte, 4)
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util.CryptoRandRead(quad)
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authInfo.SessionId = binary.BigEndian.Uint32(quad)
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} else {
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authInfo.SessionId = 0
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}
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d := net.Dialer{Control: connConfig.Protector, KeepAlive: connConfig.KeepAlive}
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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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go func() {
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makeconn:
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remoteConn, err := d.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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var sk []byte
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remoteConn, sk, err = connConfig.Transport.PrepareConnection(authInfo, remoteConn)
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if err != nil {
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remoteConn.Close()
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log.Errorf("Failed to prepare connection to remote: %v", err)
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time.Sleep(time.Second * 3)
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goto makeconn
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}
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_sessionKey.Store(sk)
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connsCh <- remoteConn
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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().([]byte)
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obfuscator, err := mux.GenerateObfs(authInfo.EncryptionMethod, sessionKey, connConfig.Transport.HasRecordLayer())
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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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Obfuscator: obfuscator,
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Valve: nil,
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UnitRead: connConfig.Transport.UnitReadFunc(),
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Unordered: authInfo.Unordered,
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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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