func (s *Socks5Server) handleUDPConnect(req *gosocks5.Request) {
cc, err := s.Base.Chain.GetConn()
// connection error
if err != nil && err != ErrEmptyChain {
glog.V(LWARNING).Infof("[udp] %s <- %s : %s", s.conn.RemoteAddr(), req.Addr, err)
reply := gosocks5.NewReply(gosocks5.Failure, nil)
reply.Write(s.conn)
glog.V(LDEBUG).Infof("[udp] %s <- %s\n%s", s.conn.RemoteAddr(), req.Addr, reply)
return
}
// serve udp connect
if err == ErrEmptyChain {
s.udpConnect(req.Addr.String())
return
}
defer cc.Close()
// forward request
if err := req.Write(cc); err != nil {
glog.V(LINFO).Infof("[udp] %s -> %s : %s", s.conn.RemoteAddr(), req.Addr, err)
gosocks5.NewReply(gosocks5.Failure, nil).Write(s.conn)
return
}
glog.V(LINFO).Infof("[udp] %s <-> %s", s.conn.RemoteAddr(), req.Addr)
s.Base.transport(s.conn, cc)
glog.V(LINFO).Infof("[udp] %s >-< %s", s.conn.RemoteAddr(), req.Addr)
}
func handleSocks5(conn net.Conn, methods []uint8) {
if err := selectMethod(conn, methods...); err != nil {
log.Println(err)
return
}
req, err := gosocks5.ReadRequest(conn)
if err != nil {
return
}
//log.Println(req)
sconn, err := makeTunnel()
if err != nil {
gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
log.Println(err)
return
}
defer sconn.Close()
switch req.Cmd {
case gosocks5.CmdConnect, gosocks5.CmdBind:
if err := req.Write(sconn); err != nil {
return
}
Transport(conn, sconn)
case gosocks5.CmdUdp:
if err := req.Write(sconn); err != nil {
return
}
rep, err := gosocks5.ReadReply(sconn)
if err != nil || rep.Rep != gosocks5.Succeeded {
return
}
uconn, err := net.ListenUDP("udp", nil)
if err != nil {
log.Println(err)
gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
return
}
defer uconn.Close()
addr := ToSocksAddr(uconn.LocalAddr())
addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
log.Println("udp:", addr)
rep = gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
log.Println(err)
return
}
go cliTunnelUDP(uconn, sconn)
// block, waiting for client exit
ioutil.ReadAll(conn)
}
}
func (s *Socks5Server) udpConnect(addr string) {
raddr, err := net.ResolveUDPAddr("udp", addr)
if err != nil {
glog.V(LINFO).Infof("[udp] %s -> %s : %s", s.conn.RemoteAddr(), addr, err)
gosocks5.NewReply(gosocks5.Failure, nil).Write(s.conn)
return
}
if err := gosocks5.NewReply(gosocks5.Succeeded, nil).Write(s.conn); err != nil {
glog.V(LINFO).Infof("[udp] %s <- %s : %s", s.conn.RemoteAddr(), addr, err)
return
}
glog.V(LINFO).Infof("[udp] %s <-> %s", s.conn.RemoteAddr(), raddr)
defer glog.V(LINFO).Infof("[udp] %s >-< %s", s.conn.RemoteAddr(), raddr)
for {
dgram, err := gosocks5.ReadUDPDatagram(s.conn)
if err != nil {
glog.V(LWARNING).Infof("[udp] %s -> %s : %s", s.conn.RemoteAddr(), addr, err)
return
}
go func() {
b := make([]byte, LargeBufferSize)
relay, err := net.DialUDP("udp", nil, raddr)
if err != nil {
glog.V(LWARNING).Infof("[udp] %s -> %s : %s", s.conn.RemoteAddr(), raddr, err)
return
}
defer relay.Close()
if _, err := relay.Write(dgram.Data); err != nil {
glog.V(LWARNING).Infof("[udp] %s -> %s : %s", s.conn.RemoteAddr(), raddr, err)
return
}
glog.V(LDEBUG).Infof("[udp-tun] %s >>> %s length: %d", s.conn.RemoteAddr(), raddr, len(dgram.Data))
relay.SetReadDeadline(time.Now().Add(time.Second * 60))
n, err := relay.Read(b)
if err != nil {
glog.V(LWARNING).Infof("[udp] %s <- %s : %s", s.conn.RemoteAddr(), raddr, err)
return
}
relay.SetReadDeadline(time.Time{})
glog.V(LDEBUG).Infof("[udp-tun] %s <<< %s length: %d", s.conn.RemoteAddr(), raddr, n)
s.conn.SetWriteDeadline(time.Now().Add(time.Second * 90))
if err := gosocks5.NewUDPDatagram(gosocks5.NewUDPHeader(uint16(n), 0, dgram.Header.Addr), b[:n]).Write(s.conn); err != nil {
glog.V(LWARNING).Infof("[udp] %s <- %s : %s", s.conn.RemoteAddr(), raddr, err)
return
}
s.conn.SetWriteDeadline(time.Time{})
}()
}
}
func serveBind(conn net.Conn) error {
l, err := net.ListenTCP("tcp", nil)
if err != nil {
glog.V(LWARNING).Infoln("socks5 bind listen:", err)
rep := gosocks5.NewReply(gosocks5.Failure, nil)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 bind listen:", err)
} else {
glog.V(LDEBUG).Infoln(rep)
}
return err
}
addr := ToSocksAddr(l.Addr())
// Issue: may not reachable when host has two interfaces
addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
rep := gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 bind:", err)
l.Close()
return err
}
glog.V(LDEBUG).Infoln(rep)
glog.V(LINFO).Infoln("[socks5] BIND on", addr, "OK")
l.SetDeadline(time.Now().Add(time.Minute * 30)) // wait 30 minutes at most
tconn, err := l.AcceptTCP()
l.Close() // only accept one peer
if err != nil {
glog.V(LWARNING).Infoln("socks5 bind accept:", err)
rep = gosocks5.NewReply(gosocks5.Failure, nil)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 bind accept:", err)
} else {
glog.V(LDEBUG).Infoln(rep)
}
return err
}
defer tconn.Close()
addr = ToSocksAddr(tconn.RemoteAddr())
glog.V(LINFO).Infoln("[socks5] BIND accept", addr)
rep = gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 bind accept:", err)
return err
}
glog.V(LDEBUG).Infoln(rep)
return Transport(conn, tconn)
}
func handle(conn net.Conn, method uint8) error {
defer conn.Close()
req, err := gosocks5.ReadRequest(conn)
if err != nil {
log.Println(err)
return err
}
tconn, err := Connect(req.Addr.String())
if err != nil {
log.Println(err)
return err
}
defer tconn.Close()
rep := gosocks5.NewReply(gosocks5.Succeeded, nil)
if err := rep.Write(conn); err != nil {
return err
}
if err := Transport(conn, tconn); err != nil {
log.Println(err)
}
return nil
}
func (s *Socks5Server) handleUDPTunnel(req *gosocks5.Request) {
cc, err := s.Base.Chain.GetConn()
// connection error
if err != nil && err != ErrEmptyChain {
glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), req.Addr, err)
reply := gosocks5.NewReply(gosocks5.Failure, nil)
reply.Write(s.conn)
glog.V(LDEBUG).Infof("[socks5-udp] %s -> %s\n%s", s.conn.RemoteAddr(), req.Addr, reply)
return
}
// serve tunnel udp, tunnel <-> remote, handle tunnel udp request
if err == ErrEmptyChain {
bindAddr, _ := net.ResolveUDPAddr("udp", req.Addr.String())
uc, err := net.ListenUDP("udp", bindAddr)
if err != nil {
glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), req.Addr, err)
return
}
defer uc.Close()
socksAddr := ToSocksAddr(uc.LocalAddr())
socksAddr.Host, _, _ = net.SplitHostPort(s.conn.LocalAddr().String())
reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)
if err := reply.Write(s.conn); err != nil {
glog.V(LWARNING).Infof("[socks5-udp] %s <- %s : %s", s.conn.RemoteAddr(), socksAddr, err)
return
}
glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", s.conn.RemoteAddr(), socksAddr, reply)
glog.V(LINFO).Infof("[socks5-udp] %s <-> %s", s.conn.RemoteAddr(), socksAddr)
s.tunnelUDP(uc, s.conn, false)
glog.V(LINFO).Infof("[socks5-udp] %s >-< %s", s.conn.RemoteAddr(), socksAddr)
return
}
defer cc.Close()
// tunnel <-> tunnel, direct forwarding
req.Write(cc)
glog.V(LINFO).Infof("[socks5-udp] %s <-> %s [tun]", s.conn.RemoteAddr(), cc.RemoteAddr())
s.Base.transport(s.conn, cc)
glog.V(LINFO).Infof("[socks5-udp] %s >-< %s [tun]", s.conn.RemoteAddr(), cc.RemoteAddr())
}
func forwardBind(req *gosocks5.Request, conn net.Conn) error {
fconn, _, err := forwardChain(forwardArgs...)
if err != nil {
glog.V(LWARNING).Infoln("[socks5] BIND(forward)", req.Addr, err)
if fconn != nil {
fconn.Close()
}
rep := gosocks5.NewReply(gosocks5.Failure, nil)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 bind forward:", err)
} else {
glog.V(LDEBUG).Infoln(rep)
}
return err
}
defer fconn.Close()
if err := req.Write(fconn); err != nil {
glog.V(LWARNING).Infoln("[socks5] BIND(forward)", err)
gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
return err
}
glog.V(LDEBUG).Infoln(req)
// first reply
rep, err := peekReply(conn, fconn)
if err != nil {
glog.V(LWARNING).Infoln("[socks5] BIND(forward)", err)
return err
}
glog.V(LINFO).Infoln("[socks5] BIND(forward) on", rep.Addr, "OK")
// second reply
rep, err = peekReply(conn, fconn)
if err != nil {
glog.V(LWARNING).Infoln("[socks5] BIND(forward) accept", err)
return err
}
glog.V(LINFO).Infoln("[socks5] BIND(forward) accept", rep.Addr)
return Transport(conn, fconn)
}
func (s *Socks5Server) handleConnect(req *gosocks5.Request) {
cc, err := s.Base.Chain.Dial(req.Addr.String())
if err != nil {
glog.V(LWARNING).Infof("[socks5-connect] %s -> %s : %s", s.conn.RemoteAddr(), req.Addr, err)
rep := gosocks5.NewReply(gosocks5.HostUnreachable, nil)
rep.Write(s.conn)
glog.V(LDEBUG).Infof("[socks5-connect] %s <- %s\n%s", s.conn.RemoteAddr(), req.Addr, rep)
return
}
defer cc.Close()
rep := gosocks5.NewReply(gosocks5.Succeeded, nil)
if err := rep.Write(s.conn); err != nil {
glog.V(LWARNING).Infof("[socks5-connect] %s <- %s : %s", s.conn.RemoteAddr(), req.Addr, err)
return
}
glog.V(LDEBUG).Infof("[socks5-connect] %s <- %s\n%s", s.conn.RemoteAddr(), req.Addr, rep)
glog.V(LINFO).Infof("[socks5-connect] %s <-> %s", s.conn.RemoteAddr(), req.Addr)
//Transport(conn, cc)
s.Base.transport(s.conn, cc)
glog.V(LINFO).Infof("[socks5-connect] %s >-< %s", s.conn.RemoteAddr(), req.Addr)
}
func peekReply(dst io.Writer, src io.Reader) (rep *gosocks5.Reply, err error) {
rep, err = gosocks5.ReadReply(src)
if err != nil {
glog.V(LWARNING).Infoln(err)
rep = gosocks5.NewReply(gosocks5.Failure, nil)
}
if err = rep.Write(dst); err != nil {
return
}
glog.V(LDEBUG).Infoln(rep)
if rep.Rep != gosocks5.Succeeded {
err = errors.New("Failure")
}
return
}
func socks5Handle(conn net.Conn) {
defer conn.Close()
req, err := gosocks5.ReadRequest(conn)
if err != nil {
log.Println(err)
return
}
switch req.Cmd {
case gosocks5.CmdConnect:
//log.Println("connect", req.Addr.String())
tconn, err := Connect(req.Addr.String(), Proxy)
if err != nil {
gosocks5.NewReply(gosocks5.HostUnreachable, nil).Write(conn)
return
}
defer tconn.Close()
rep := gosocks5.NewReply(gosocks5.Succeeded, nil)
if err := rep.Write(conn); err != nil {
return
}
if err := Transport(conn, tconn); err != nil {
//log.Println(err)
}
case gosocks5.CmdBind:
l, err := net.ListenTCP("tcp", nil)
if err != nil {
gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
return
}
addr := ToSocksAddr(l.Addr())
addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
log.Println("bind:", addr)
rep := gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
return
}
tconn, err := l.AcceptTCP()
if err != nil {
log.Println("accept:", err)
gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
return
}
defer tconn.Close()
l.Close()
addr = ToSocksAddr(tconn.RemoteAddr())
log.Println("accept peer:", addr.String())
rep = gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
log.Println(err)
return
}
if err := Transport(conn, tconn); err != nil {
//log.Println(err)
}
case gosocks5.CmdUdp:
uconn, err := net.ListenUDP("udp", nil)
if err != nil {
log.Println(err)
gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
return
}
defer uconn.Close()
addr := ToSocksAddr(uconn.LocalAddr())
addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
log.Println("udp:", addr)
rep := gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
log.Println(err)
return
}
srvTunnelUDP(conn, uconn)
}
}
func handleSocks5Request(req *gosocks5.Request, conn net.Conn) {
glog.V(LDEBUG).Infoln(req)
switch req.Cmd {
case gosocks5.CmdConnect:
glog.V(LINFO).Infoln("[socks5] CONNECT", req.Addr)
tconn, err := Connect(req.Addr.String())
if err != nil {
glog.V(LWARNING).Infoln("[socks5] CONNECT", req.Addr, err)
rep := gosocks5.NewReply(gosocks5.HostUnreachable, nil)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 connect:", err)
} else {
glog.V(LDEBUG).Infoln(rep)
}
return
}
defer tconn.Close()
rep := gosocks5.NewReply(gosocks5.Succeeded, nil)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 connect:", err)
return
}
glog.V(LDEBUG).Infoln(rep)
glog.V(LINFO).Infoln("[socks5] CONNECT", req.Addr, "OK")
Transport(conn, tconn)
case gosocks5.CmdBind:
glog.V(LINFO).Infoln("[socks5] BIND", req.Addr)
if len(forwardArgs) > 0 {
forwardBind(req, conn)
} else {
serveBind(conn)
}
case gosocks5.CmdUdp:
glog.V(LINFO).Infoln("[socks5] UDP ASSOCIATE", req.Addr)
uconn, err := net.ListenUDP("udp", nil)
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp listen:", err)
rep := gosocks5.NewReply(gosocks5.Failure, nil)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 udp listen:", err)
} else {
glog.V(LDEBUG).Infoln(rep)
}
return
}
defer uconn.Close()
addr := ToSocksAddr(uconn.LocalAddr())
addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
glog.V(LINFO).Infoln("[socks5] UDP listen on", addr)
rep := gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
} else {
glog.V(LDEBUG).Infoln(rep)
}
cc, dgram, err := createClientConn(conn, uconn)
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
glog.V(LINFO).Infof("[udp] to %s, length %d", dgram.Header.Addr, len(dgram.Data))
raddr, err := net.ResolveUDPAddr("udp", dgram.Header.Addr.String())
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
sc, err := createServerConn(uconn, raddr)
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
if err = sc.WriteUDPTimeout(dgram, time.Second*30); err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
dgram, err = sc.ReadUDPTimeout(time.Second * 30)
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
glog.V(LINFO).Infof("[udp] from %s, length %d", dgram.Header.Addr, len(dgram.Data))
if err = cc.WriteUDPTimeout(dgram, time.Second*30); err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
TransportUDP(cc, sc)
default:
glog.V(LWARNING).Infoln("Unrecognized request: ", req)
}
}
func (s *Socks5Server) bindOn(addr string) {
bindAddr, _ := net.ResolveTCPAddr("tcp", addr)
ln, err := net.ListenTCP("tcp", bindAddr) // strict mode: if the port already in use, it will return error
if err != nil {
glog.V(LWARNING).Infof("[socks5-bind] %s -> %s : %s", s.conn.RemoteAddr(), addr, err)
gosocks5.NewReply(gosocks5.Failure, nil).Write(s.conn)
return
}
socksAddr := ToSocksAddr(ln.Addr())
// Issue: may not reachable when host has multi-interface
socksAddr.Host, _, _ = net.SplitHostPort(s.conn.LocalAddr().String())
reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)
if err := reply.Write(s.conn); err != nil {
glog.V(LWARNING).Infof("[socks5-bind] %s <- %s : %s", s.conn.RemoteAddr(), addr, err)
ln.Close()
return
}
glog.V(LDEBUG).Infof("[socks5-bind] %s <- %s\n%s", s.conn.RemoteAddr(), addr, reply)
glog.V(LINFO).Infof("[socks5-bind] %s - %s BIND ON %s OK", s.conn.RemoteAddr(), addr, socksAddr)
var pconn net.Conn
accept := func() <-chan error {
errc := make(chan error, 1)
go func() {
defer close(errc)
defer ln.Close()
c, err := ln.AcceptTCP()
if err != nil {
errc <- err
return
}
pconn = c
}()
return errc
}
pc1, pc2 := net.Pipe()
pipe := func() <-chan error {
errc := make(chan error, 1)
go func() {
defer close(errc)
defer pc1.Close()
errc <- s.Base.transport(s.conn, pc1)
}()
return errc
}
defer pc2.Close()
for {
select {
case err := <-accept():
if err != nil || pconn == nil {
glog.V(LWARNING).Infof("[socks5-bind] %s <- %s : %s", s.conn.RemoteAddr(), addr, err)
return
}
defer pconn.Close()
reply := gosocks5.NewReply(gosocks5.Succeeded, ToSocksAddr(pconn.RemoteAddr()))
if err := reply.Write(pc2); err != nil {
glog.V(LWARNING).Infof("[socks5-bind] %s <- %s : %s", s.conn.RemoteAddr(), addr, err)
}
glog.V(LDEBUG).Infof("[socks5-bind] %s <- %s\n%s", s.conn.RemoteAddr(), addr, reply)
glog.V(LINFO).Infof("[socks5-bind] %s <- %s PEER %s ACCEPTED", s.conn.RemoteAddr(), socksAddr, pconn.RemoteAddr())
glog.V(LINFO).Infof("[socks5-bind] %s <-> %s", s.conn.RemoteAddr(), pconn.RemoteAddr())
if err = s.Base.transport(pc2, pconn); err != nil {
glog.V(LWARNING).Infoln(err)
}
glog.V(LINFO).Infof("[socks5-bind] %s >-< %s", s.conn.RemoteAddr(), pconn.RemoteAddr())
return
case err := <-pipe():
glog.V(LWARNING).Infof("[socks5-bind] %s -> %s : %v", s.conn.RemoteAddr(), addr, err)
ln.Close()
return
}
}
}
func (s *Socks5Server) handleUDPRelay(req *gosocks5.Request) {
bindAddr, _ := net.ResolveUDPAddr("udp", req.Addr.String())
relay, err := net.ListenUDP("udp", bindAddr) // udp associate, strict mode: if the port already in use, it will return error
if err != nil {
glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), req.Addr, err)
reply := gosocks5.NewReply(gosocks5.Failure, nil)
reply.Write(s.conn)
glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", s.conn.RemoteAddr(), req.Addr, reply)
return
}
defer relay.Close()
socksAddr := ToSocksAddr(relay.LocalAddr())
socksAddr.Host, _, _ = net.SplitHostPort(s.conn.LocalAddr().String())
reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)
if err := reply.Write(s.conn); err != nil {
glog.V(LWARNING).Infof("[socks5-udp] %s <- %s : %s", s.conn.RemoteAddr(), req.Addr, err)
return
}
glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", s.conn.RemoteAddr(), reply.Addr, reply)
glog.V(LINFO).Infof("[socks5-udp] %s - %s BIND ON %s OK", s.conn.RemoteAddr(), req.Addr, socksAddr)
cc, err := s.Base.Chain.GetConn()
// connection error
if err != nil && err != ErrEmptyChain {
glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), socksAddr, err)
return
}
// serve as standard socks5 udp relay local <-> remote
if err == ErrEmptyChain {
peer, er := net.ListenUDP("udp", nil)
if er != nil {
glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), socksAddr, er)
return
}
defer peer.Close()
go s.transportUDP(relay, peer)
}
// forward udp local <-> tunnel
if err == nil {
defer cc.Close()
cc.SetWriteDeadline(time.Now().Add(WriteTimeout))
req := gosocks5.NewRequest(CmdUdpTun, nil)
if err := req.Write(cc); err != nil {
glog.V(LWARNING).Infoln("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), cc.RemoteAddr(), err)
return
}
cc.SetWriteDeadline(time.Time{})
glog.V(LDEBUG).Infof("[socks5-udp] %s -> %s\n%s", s.conn.RemoteAddr(), cc.RemoteAddr(), req)
cc.SetReadDeadline(time.Now().Add(ReadTimeout))
reply, err = gosocks5.ReadReply(cc)
if err != nil {
glog.V(LWARNING).Infoln("[socks5-udp] %s -> %s : %s", s.conn.RemoteAddr(), cc.RemoteAddr(), err)
return
}
glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", s.conn.RemoteAddr(), cc.RemoteAddr(), reply)
if reply.Rep != gosocks5.Succeeded {
glog.V(LWARNING).Infoln("[socks5-udp] %s <- %s : udp associate failed", s.conn.RemoteAddr(), cc.RemoteAddr())
return
}
cc.SetReadDeadline(time.Time{})
glog.V(LINFO).Infof("[socks5-udp] %s <-> %s [tun: %s]", s.conn.RemoteAddr(), socksAddr, reply.Addr)
go s.tunnelUDP(relay, cc, true)
}
glog.V(LINFO).Infof("[socks5-udp] %s <-> %s", s.conn.RemoteAddr(), socksAddr)
b := make([]byte, SmallBufferSize)
for {
_, err := s.conn.Read(b) // discard any data from tcp connection
if err != nil {
glog.V(LWARNING).Infof("[socks5-udp] %s - %s : %s", s.conn.RemoteAddr(), socksAddr, err)
break // client disconnected
}
}
glog.V(LINFO).Infof("[socks5-udp] %s >-< %s", s.conn.RemoteAddr(), socksAddr)
}
func handleSocks5Request(req *gosocks5.Request, conn net.Conn) {
glog.V(LDEBUG).Infoln(req)
switch req.Cmd {
case gosocks5.CmdConnect:
glog.V(LINFO).Infoln("[socks5] CONNECT", req.Addr)
tconn, err := Connect(req.Addr.String())
if err != nil {
glog.V(LWARNING).Infoln("[socks5] CONNECT", req.Addr, err)
rep := gosocks5.NewReply(gosocks5.HostUnreachable, nil)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 connect:", err)
} else {
glog.V(LDEBUG).Infoln(rep)
}
return
}
defer tconn.Close()
rep := gosocks5.NewReply(gosocks5.Succeeded, nil)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 connect:", err)
return
}
glog.V(LDEBUG).Infoln(rep)
glog.V(LINFO).Infoln("[socks5] CONNECT", req.Addr, "OK")
Transport(conn, tconn)
case gosocks5.CmdBind:
glog.V(LINFO).Infoln("[socks5] BIND", req.Addr)
if len(forwardArgs) > 0 {
forwardBind(req, conn)
} else {
serveBind(conn)
}
case gosocks5.CmdUdp, CmdUdpTun:
glog.V(LINFO).Infoln("[socks5] UDP ASSOCIATE", req.Addr)
uconn, err := net.ListenUDP("udp", nil)
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp listen:", err)
rep := gosocks5.NewReply(gosocks5.Failure, nil)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 udp listen:", err)
} else {
glog.V(LDEBUG).Infoln(rep)
}
return
}
defer uconn.Close()
addr := ToSocksAddr(uconn.LocalAddr())
addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
rep := gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
} else {
glog.V(LDEBUG).Infoln(rep)
glog.V(LINFO).Infoln("[socks5] UDP listen on", addr)
}
var cc *UDPConn
var dgram *gosocks5.UDPDatagram
if req.Cmd == CmdUdpTun {
dgram, err = gosocks5.ReadUDPDatagram(conn)
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
cc = Client(conn, nil)
glog.V(LINFO).Infof("[udp] -> %s, length %d", dgram.Header.Addr, len(dgram.Data))
} else {
b := udpPool.Get().([]byte)
defer udpPool.Put(b)
n, raddr, err := uconn.ReadFromUDP(b)
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
dgram, err = gosocks5.ReadUDPDatagram(bytes.NewReader(b[:n]))
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
cc = Client(uconn, raddr)
glog.V(LINFO).Infof("[udp] %s -> %s, length %d", raddr, dgram.Header.Addr, len(dgram.Data))
}
sc, err := createServerConn(uconn)
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
defer sc.Close()
if err = sc.WriteUDPTimeout(dgram, time.Second*90); err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
dgram, err = sc.ReadUDPTimeout(time.Second * 90)
if err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
glog.V(LINFO).Infof("[udp] <- %s, length %d", dgram.Header.Addr, len(dgram.Data))
if err = cc.WriteUDPTimeout(dgram, time.Second*90); err != nil {
glog.V(LWARNING).Infoln("socks5 udp:", err)
return
}
if req.Cmd == gosocks5.CmdUdp {
go TransportUDP(cc, sc)
ioutil.ReadAll(conn) // wait for client exit
glog.V(LINFO).Infoln("[udp] transfer done")
} else {
TransportUDP(cc, sc)
}
default:
glog.V(LWARNING).Infoln("Unrecognized request: ", req)
}
}
func handleSocks5Request(req *gosocks5.Request, conn net.Conn, arg Args) {
if glog.V(LDEBUG) {
glog.Infoln(req)
}
switch req.Cmd {
case gosocks5.CmdConnect:
if glog.V(LINFO) {
glog.Infoln("socks5 connect:", req.Addr.String())
}
tconn, err := connect(req.Addr.String())
if err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 connect:", err)
}
rep := gosocks5.NewReply(gosocks5.HostUnreachable, nil)
if err := rep.Write(conn); err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 connect:", err)
}
} else {
if glog.V(LDEBUG) {
glog.Infoln(rep)
}
}
return
}
defer tconn.Close()
rep := gosocks5.NewReply(gosocks5.Succeeded, nil)
if err := rep.Write(conn); err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 connect:", err)
}
return
}
if glog.V(LDEBUG) {
glog.Infoln(rep)
}
Transport(conn, tconn)
case gosocks5.CmdBind:
l, err := net.ListenTCP("tcp", nil)
if err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 bind listen:", err)
}
rep := gosocks5.NewReply(gosocks5.Failure, nil)
if err := rep.Write(conn); err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 bind listen:", err)
}
} else {
if glog.V(LDEBUG) {
glog.Infoln(rep)
}
}
return
}
addr := ToSocksAddr(l.Addr())
addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
if glog.V(LINFO) {
glog.Infoln("socks5 bind:", addr)
}
rep := gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 bind:", err)
}
l.Close()
return
}
if glog.V(LDEBUG) {
glog.Infoln(rep)
}
tconn, err := l.AcceptTCP()
l.Close() // only accept one peer
if err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 bind accept:", err)
}
rep = gosocks5.NewReply(gosocks5.Failure, nil)
if err := rep.Write(conn); err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 bind accept:", err)
}
} else {
if glog.V(LDEBUG) {
glog.Infoln(rep)
}
}
return
}
defer tconn.Close()
addr = ToSocksAddr(tconn.RemoteAddr())
if glog.V(LINFO) {
glog.Infoln("socks5 bind accept:", addr.String())
}
rep = gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 bind accept:", err)
}
return
}
if glog.V(LDEBUG) {
glog.Infoln(rep)
}
if err := Transport(conn, tconn); err != nil {
//log.Println(err)
}
case gosocks5.CmdUdp:
uconn, err := net.ListenUDP("udp", nil)
if err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 udp listen:", err)
}
rep := gosocks5.NewReply(gosocks5.Failure, nil)
if err := rep.Write(conn); err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 udp listen:", err)
}
} else {
if glog.V(LDEBUG) {
glog.Infoln(rep)
}
}
return
}
defer uconn.Close()
addr := ToSocksAddr(uconn.LocalAddr())
addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
if glog.V(LINFO) {
glog.Infoln("socks5 udp:", addr)
}
rep := gosocks5.NewReply(gosocks5.Succeeded, addr)
if err := rep.Write(conn); err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5 udp:", err)
}
return
} else {
if glog.V(LDEBUG) {
glog.Infoln(rep)
}
}
srvTunnelUDP(conn, uconn)
}
}
