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Implement reverse connection handling in SOCKS5 server
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| package socks5 | ||
|
|
||
| import ( | ||
| "github.com/google/uuid" | ||
| "github.com/puzpuzpuz/xsync/v3" | ||
| "log/slog" | ||
| "net" | ||
| ) | ||
|
|
||
| type TCPListener struct { | ||
| listener net.Listener | ||
| connectChannels *xsync.MapOf[string, chan net.Conn] // todo -- use [16]byte for uuid instead of string | ||
| } | ||
|
|
||
| func NewTCPListener() (*TCPListener, error) { | ||
| l, err := net.Listen("tcp", ":1234") | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return &TCPListener{ | ||
| listener: l, | ||
| connectChannels: xsync.NewMapOf[string, chan net.Conn](), | ||
| }, nil | ||
| } | ||
|
|
||
| func (l *TCPListener) AddConnectChannel(uuid uuid.UUID, ch chan net.Conn) { | ||
| l.connectChannels.Store(uuid.String(), ch) | ||
| } | ||
|
|
||
| // Start starts the listener | ||
| func (l *TCPListener) Start() { | ||
| for { | ||
| conn, err := l.listener.Accept() | ||
| if err != nil { | ||
| return | ||
| } | ||
| go l.handleConnection(conn) | ||
| } | ||
| } | ||
|
|
||
| // handleConnection handles the connection | ||
| func (l *TCPListener) handleConnection(conn net.Conn) { | ||
| //defer conn.Close() | ||
| for { | ||
| // read uuid from the connection | ||
| readbuffer := make([]byte, 36) | ||
|
|
||
| _, err := conn.Read(readbuffer) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| // check if uuid is in the map | ||
| ch, ok := l.connectChannels.Load(string(readbuffer)) | ||
| if !ok { | ||
| slog.Error("uuid not found in map") | ||
| return | ||
| } | ||
| // send the connection to the channel | ||
| ch <- conn | ||
| return | ||
| } | ||
| } |