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Feature(proxy): support gost relay protocol (#310)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,252 @@ | ||
| package proxy | ||
|
|
||
| import ( | ||
| "bytes" | ||
| "context" | ||
| "encoding/binary" | ||
| "errors" | ||
| "fmt" | ||
| "io" | ||
| "math" | ||
| "net" | ||
| "sync" | ||
|
|
||
| "github.com/go-gost/relay" | ||
|
|
||
| "github.com/xjasonlyu/tun2socks/v2/common/pool" | ||
| "github.com/xjasonlyu/tun2socks/v2/dialer" | ||
| M "github.com/xjasonlyu/tun2socks/v2/metadata" | ||
| "github.com/xjasonlyu/tun2socks/v2/proxy/proto" | ||
| ) | ||
|
|
||
| var _ Proxy = (*Relay)(nil) | ||
|
|
||
| type Relay struct { | ||
| *Base | ||
|
|
||
| user string | ||
| pass string | ||
|
|
||
| noDelay bool | ||
| } | ||
|
|
||
| func NewRelay(addr, user, pass string, noDelay bool) (*Relay, error) { | ||
| return &Relay{ | ||
| Base: &Base{ | ||
| addr: addr, | ||
| proto: proto.Relay, | ||
| }, | ||
| user: user, | ||
| pass: pass, | ||
| noDelay: noDelay, | ||
| }, nil | ||
| } | ||
|
|
||
| func (rl *Relay) DialContext(ctx context.Context, metadata *M.Metadata) (c net.Conn, err error) { | ||
| return rl.dialContext(ctx, metadata) | ||
| } | ||
|
|
||
| func (rl *Relay) DialUDP(metadata *M.Metadata) (net.PacketConn, error) { | ||
| ctx, cancel := context.WithTimeout(context.Background(), tcpConnectTimeout) | ||
| defer cancel() | ||
|
|
||
| return rl.dialContext(ctx, metadata) | ||
| } | ||
|
|
||
| func (rl *Relay) dialContext(ctx context.Context, metadata *M.Metadata) (rc *relayConn, err error) { | ||
| var c net.Conn | ||
|
|
||
| c, err = dialer.DialContext(ctx, "tcp", rl.Addr()) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("connect to %s: %w", rl.Addr(), err) | ||
| } | ||
| setKeepAlive(c) | ||
|
|
||
| defer func(c net.Conn) { | ||
| safeConnClose(c, err) | ||
| }(c) | ||
|
|
||
| req := relay.Request{ | ||
| Version: relay.Version1, | ||
| Cmd: relay.CmdConnect, | ||
| } | ||
|
|
||
| if metadata.Network == M.UDP { | ||
| req.Cmd |= relay.FUDP | ||
| req.Features = append(req.Features, &relay.NetworkFeature{ | ||
| Network: relay.NetworkUDP, | ||
| }) | ||
| } | ||
|
|
||
| if rl.user != "" { | ||
| req.Features = append(req.Features, &relay.UserAuthFeature{ | ||
| Username: rl.user, | ||
| Password: rl.pass, | ||
| }) | ||
| } | ||
|
|
||
| req.Features = append(req.Features, serializeRelayAddr(metadata)) | ||
|
|
||
| if rl.noDelay { | ||
| if _, err = req.WriteTo(c); err != nil { | ||
| return | ||
| } | ||
| if err = readRelayResponse(c); err != nil { | ||
| return | ||
| } | ||
| } | ||
|
|
||
| switch metadata.Network { | ||
| case M.TCP: | ||
| rc = newRelayConn(c, metadata.Addr(), rl.noDelay, false) | ||
| if !rl.noDelay { | ||
| if _, err = req.WriteTo(rc.wbuf); err != nil { | ||
| return | ||
| } | ||
| } | ||
| case M.UDP: | ||
| rc = newRelayConn(c, metadata.Addr(), rl.noDelay, true) | ||
| if !rl.noDelay { | ||
| if _, err = req.WriteTo(rc.wbuf); err != nil { | ||
| return | ||
| } | ||
| } | ||
| default: | ||
| err = fmt.Errorf("network %s is unsupported", metadata.Network) | ||
| return | ||
| } | ||
|
|
||
| return | ||
| } | ||
|
|
||
| type relayConn struct { | ||
| net.Conn | ||
| udp bool | ||
| addr net.Addr | ||
| once sync.Once | ||
| wbuf *bytes.Buffer | ||
| } | ||
|
|
||
| func newRelayConn(c net.Conn, addr net.Addr, noDelay, udp bool) *relayConn { | ||
| rc := &relayConn{ | ||
| Conn: c, | ||
| addr: addr, | ||
| udp: udp, | ||
| } | ||
| if !noDelay { | ||
| rc.wbuf = &bytes.Buffer{} | ||
| } | ||
| return rc | ||
| } | ||
|
|
||
| func (rc *relayConn) ReadFrom(b []byte) (int, net.Addr, error) { | ||
| n, err := rc.Read(b) | ||
| return n, rc.addr, err | ||
| } | ||
|
|
||
| func (rc *relayConn) Read(b []byte) (n int, err error) { | ||
| rc.once.Do(func() { | ||
| if rc.wbuf != nil { | ||
| err = readRelayResponse(rc.Conn) | ||
| } | ||
| }) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| if !rc.udp { | ||
| return rc.Conn.Read(b) | ||
| } | ||
|
|
||
| var bb [2]byte | ||
| _, err = io.ReadFull(rc.Conn, bb[:]) | ||
| if err != nil { | ||
| return | ||
| } | ||
|
|
||
| dLen := int(binary.BigEndian.Uint16(bb[:])) | ||
| if len(b) >= dLen { | ||
| return io.ReadFull(rc.Conn, b[:dLen]) | ||
| } | ||
|
|
||
| buf := pool.Get(dLen) | ||
| defer pool.Put(buf) | ||
| _, err = io.ReadFull(rc.Conn, buf) | ||
| n = copy(b, buf) | ||
|
|
||
| return | ||
| } | ||
|
|
||
| func (rc *relayConn) WriteTo(b []byte, _ net.Addr) (int, error) { | ||
| return rc.Write(b) | ||
| } | ||
|
|
||
| func (rc *relayConn) Write(b []byte) (int, error) { | ||
| if rc.udp { | ||
| return rc.udpWrite(b) | ||
| } | ||
| return rc.tcpWrite(b) | ||
| } | ||
|
|
||
| func (rc *relayConn) tcpWrite(b []byte) (n int, err error) { | ||
| if rc.wbuf != nil && rc.wbuf.Len() > 0 { | ||
| n = len(b) | ||
| rc.wbuf.Write(b) | ||
| _, err = rc.Conn.Write(rc.wbuf.Bytes()) | ||
| rc.wbuf.Reset() | ||
| return | ||
| } | ||
| return rc.Conn.Write(b) | ||
| } | ||
|
|
||
| func (rc *relayConn) udpWrite(b []byte) (n int, err error) { | ||
| if len(b) > math.MaxUint16 { | ||
| err = errors.New("write: data maximum exceeded") | ||
| return | ||
| } | ||
|
|
||
| n = len(b) | ||
| if rc.wbuf != nil && rc.wbuf.Len() > 0 { | ||
| var bb [2]byte | ||
| binary.BigEndian.PutUint16(bb[:], uint16(len(b))) | ||
| rc.wbuf.Write(bb[:]) | ||
| rc.wbuf.Write(b) | ||
| _, err = rc.wbuf.WriteTo(rc.Conn) | ||
| return | ||
| } | ||
|
|
||
| var bb [2]byte | ||
| binary.BigEndian.PutUint16(bb[:], uint16(len(b))) | ||
| _, err = rc.Conn.Write(bb[:]) | ||
| if err != nil { | ||
| return | ||
| } | ||
| return rc.Conn.Write(b) | ||
| } | ||
|
|
||
| func readRelayResponse(r io.Reader) error { | ||
| resp := relay.Response{} | ||
| if _, err := resp.ReadFrom(r); err != nil { | ||
| return err | ||
| } | ||
| if resp.Version != relay.Version1 { | ||
| return relay.ErrBadVersion | ||
| } | ||
| if resp.Status != relay.StatusOK { | ||
| return fmt.Errorf("status %d", resp.Status) | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func serializeRelayAddr(m *M.Metadata) *relay.AddrFeature { | ||
| af := &relay.AddrFeature{ | ||
| Host: m.DstIP.String(), | ||
| Port: m.DstPort, | ||
| } | ||
| if m.DstIP.To4() != nil { | ||
| af.AType = relay.AddrIPv4 | ||
| } else { | ||
| af.AType = relay.AddrIPv6 | ||
| } | ||
| return af | ||
| } |