How to use RemoteAddr method of conn Package

Best Gauge code snippet using conn.RemoteAddr

socks.go

Source:socks.go Github

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...125 conn = tls.Server(conn, selector.TLSConfig)126 }127 req, err := gosocks5.ReadUserPassRequest(conn)128 if err != nil {129 log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), err)130 return nil, err131 }132 if Debug {133 log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), req.String())134 }135 valid := false136 for _, user := range selector.Users {137 username := user.Username()138 password, _ := user.Password()139 if (req.Username == username && req.Password == password) ||140 (req.Username == username && password == "") ||141 (username == "" && req.Password == password) {142 valid = true143 break144 }145 }146 if len(selector.Users) > 0 && !valid {147 resp := gosocks5.NewUserPassResponse(gosocks5.UserPassVer, gosocks5.Failure)148 if err := resp.Write(conn); err != nil {149 log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), err)150 return nil, err151 }152 if Debug {153 log.Log("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), resp)154 }155 log.Logf("[socks5] %s - %s: proxy authentication required", conn.RemoteAddr(), conn.LocalAddr())156 return nil, gosocks5.ErrAuthFailure157 }158 resp := gosocks5.NewUserPassResponse(gosocks5.UserPassVer, gosocks5.Succeeded)159 if err := resp.Write(conn); err != nil {160 log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), err)161 return nil, err162 }163 if Debug {164 log.Logf("[socks5] %s - %s: %s", conn.RemoteAddr(), conn.LocalAddr(), resp)165 }166 case gosocks5.MethodNoAcceptable:167 return nil, gosocks5.ErrBadMethod168 }169 return conn, nil170}171type socks5Connector struct {172 User *url.Userinfo173}174// SOCKS5Connector creates a connector for SOCKS5 proxy client.175// It accepts an optional auth info for SOCKS5 Username/Password Authentication.176func SOCKS5Connector(user *url.Userinfo) Connector {177 return &socks5Connector{User: user}178}179func (c *socks5Connector) Connect(conn net.Conn, addr string, options ...ConnectOption) (net.Conn, error) {180 selector := &clientSelector{181 TLSConfig: &tls.Config{InsecureSkipVerify: true},182 User: c.User,183 }184 selector.AddMethod(185 gosocks5.MethodNoAuth,186 gosocks5.MethodUserPass,187 MethodTLS,188 )189 cc := gosocks5.ClientConn(conn, selector)190 if err := cc.Handleshake(); err != nil {191 return nil, err192 }193 conn = cc194 host, port, err := net.SplitHostPort(addr)195 if err != nil {196 return nil, err197 }198 p, _ := strconv.Atoi(port)199 req := gosocks5.NewRequest(gosocks5.CmdConnect, &gosocks5.Addr{200 Type: gosocks5.AddrDomain,201 Host: host,202 Port: uint16(p),203 })204 if err := req.Write(conn); err != nil {205 return nil, err206 }207 if Debug {208 log.Log("[socks5]", req)209 }210 reply, err := gosocks5.ReadReply(conn)211 if err != nil {212 return nil, err213 }214 if Debug {215 log.Log("[socks5]", reply)216 }217 if reply.Rep != gosocks5.Succeeded {218 return nil, errors.New("Service unavailable")219 }220 return conn, nil221}222type socks4Connector struct{}223// SOCKS4Connector creates a Connector for SOCKS4 proxy client.224func SOCKS4Connector() Connector {225 return &socks4Connector{}226}227func (c *socks4Connector) Connect(conn net.Conn, addr string, options ...ConnectOption) (net.Conn, error) {228 taddr, err := net.ResolveTCPAddr("tcp4", addr)229 if err != nil {230 return nil, err231 }232 if len(taddr.IP) == 0 {233 taddr.IP = net.IPv4zero234 }235 req := gosocks4.NewRequest(gosocks4.CmdConnect,236 &gosocks4.Addr{237 Type: gosocks4.AddrIPv4,238 Host: taddr.IP.String(),239 Port: uint16(taddr.Port),240 }, nil,241 )242 if err := req.Write(conn); err != nil {243 return nil, err244 }245 if Debug {246 log.Logf("[socks4] %s", req)247 }248 reply, err := gosocks4.ReadReply(conn)249 if err != nil {250 return nil, err251 }252 if Debug {253 log.Logf("[socks4] %s", reply)254 }255 if reply.Code != gosocks4.Granted {256 return nil, fmt.Errorf("[socks4] %d", reply.Code)257 }258 return conn, nil259}260type socks4aConnector struct{}261// SOCKS4AConnector creates a Connector for SOCKS4A proxy client.262func SOCKS4AConnector() Connector {263 return &socks4aConnector{}264}265func (c *socks4aConnector) Connect(conn net.Conn, addr string, options ...ConnectOption) (net.Conn, error) {266 host, port, err := net.SplitHostPort(addr)267 if err != nil {268 return nil, err269 }270 p, _ := strconv.Atoi(port)271 req := gosocks4.NewRequest(gosocks4.CmdConnect,272 &gosocks4.Addr{Type: gosocks4.AddrDomain, Host: host, Port: uint16(p)}, nil)273 if err := req.Write(conn); err != nil {274 return nil, err275 }276 if Debug {277 log.Logf("[socks4a] %s", req)278 }279 reply, err := gosocks4.ReadReply(conn)280 if err != nil {281 return nil, err282 }283 if Debug {284 log.Logf("[socks4a] %s", reply)285 }286 if reply.Code != gosocks4.Granted {287 return nil, fmt.Errorf("[socks4a] %d", reply.Code)288 }289 return conn, nil290}291type socks5Handler struct {292 selector *serverSelector293 options *HandlerOptions294}295// SOCKS5Handler creates a server Handler for SOCKS5 proxy server.296func SOCKS5Handler(opts ...HandlerOption) Handler {297 h := &socks5Handler{}298 h.Init(opts...)299 return h300}301func (h *socks5Handler) Init(options ...HandlerOption) {302 if h.options == nil {303 h.options = &HandlerOptions{}304 }305 for _, opt := range options {306 opt(h.options)307 }308 tlsConfig := h.options.TLSConfig309 if tlsConfig == nil {310 tlsConfig = DefaultTLSConfig311 }312 h.selector = &serverSelector{ // socks5 server selector313 Users: h.options.Users,314 TLSConfig: tlsConfig,315 }316 // methods that socks5 server supported317 h.selector.AddMethod(318 gosocks5.MethodNoAuth,319 gosocks5.MethodUserPass,320 MethodTLS,321 MethodTLSAuth,322 )323}324func (h *socks5Handler) Handle(conn net.Conn) {325 defer conn.Close()326 conn = gosocks5.ServerConn(conn, h.selector)327 req, err := gosocks5.ReadRequest(conn)328 if err != nil {329 log.Log("[socks5]", err)330 return331 }332 if Debug {333 log.Logf("[socks5] %s - %s\n%s", conn.RemoteAddr(), req.Addr, req)334 }335 switch req.Cmd {336 case gosocks5.CmdConnect:337 h.handleConnect(conn, req)338 case gosocks5.CmdBind:339 h.handleBind(conn, req)340 case gosocks5.CmdUdp:341 h.handleUDPRelay(conn, req)342 case CmdMuxBind:343 h.handleMuxBind(conn, req)344 case CmdUDPTun:345 h.handleUDPTunnel(conn, req)346 default:347 log.Log("[socks5] Unrecognized request:", req.Cmd)348 }349}350func (h *socks5Handler) handleConnect(conn net.Conn, req *gosocks5.Request) {351 addr := req.Addr.String()352 if !Can("tcp", addr, h.options.Whitelist, h.options.Blacklist) {353 log.Logf("[socks5-connect] Unauthorized to tcp connect to %s", addr)354 rep := gosocks5.NewReply(gosocks5.NotAllowed, nil)355 rep.Write(conn)356 if Debug {357 log.Logf("[socks5-connect] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)358 }359 return360 }361 if h.options.Bypass.Contains(addr) {362 log.Logf("[socks5-connect] [bypass] %s", addr)363 rep := gosocks5.NewReply(gosocks5.NotAllowed, nil)364 rep.Write(conn)365 if Debug {366 log.Logf("[socks5-connect] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)367 }368 return369 }370 cc, err := h.options.Chain.Dial(addr,371 RetryChainOption(h.options.Retries),372 TimeoutChainOption(h.options.Timeout),373 HostsChainOption(h.options.Hosts),374 ResolverChainOption(h.options.Resolver),375 )376 if err != nil {377 log.Logf("[socks5-connect] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)378 rep := gosocks5.NewReply(gosocks5.HostUnreachable, nil)379 rep.Write(conn)380 if Debug {381 log.Logf("[socks5-connect] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)382 }383 return384 }385 defer cc.Close()386 rep := gosocks5.NewReply(gosocks5.Succeeded, nil)387 if err := rep.Write(conn); err != nil {388 log.Logf("[socks5-connect] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)389 return390 }391 if Debug {392 log.Logf("[socks5-connect] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)393 }394 log.Logf("[socks5-connect] %s <-> %s", conn.RemoteAddr(), req.Addr)395 transport(conn, cc)396 log.Logf("[socks5-connect] %s >-< %s", conn.RemoteAddr(), req.Addr)397}398func (h *socks5Handler) handleBind(conn net.Conn, req *gosocks5.Request) {399 if h.options.Chain.IsEmpty() {400 addr := req.Addr.String()401 if !Can("rtcp", addr, h.options.Whitelist, h.options.Blacklist) {402 log.Logf("Unauthorized to tcp bind to %s", addr)403 return404 }405 h.bindOn(conn, addr)406 return407 }408 cc, err := h.options.Chain.Conn()409 if err != nil {410 log.Logf("[socks5-bind] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)411 reply := gosocks5.NewReply(gosocks5.Failure, nil)412 reply.Write(conn)413 if Debug {414 log.Logf("[socks5-bind] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, reply)415 }416 return417 }418 // forward request419 // note: this type of request forwarding is defined when starting server,420 // so we don't need to authenticate it, as it's as explicit as whitelisting421 defer cc.Close()422 req.Write(cc)423 log.Logf("[socks5-bind] %s <-> %s", conn.RemoteAddr(), cc.RemoteAddr())424 transport(conn, cc)425 log.Logf("[socks5-bind] %s >-< %s", conn.RemoteAddr(), cc.RemoteAddr())426}427func (h *socks5Handler) bindOn(conn net.Conn, addr string) {428 bindAddr, _ := net.ResolveTCPAddr("tcp", addr)429 ln, err := net.ListenTCP("tcp", bindAddr) // strict mode: if the port already in use, it will return error430 if err != nil {431 log.Logf("[socks5-bind] %s -> %s : %s", conn.RemoteAddr(), addr, err)432 gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)433 return434 }435 socksAddr := toSocksAddr(ln.Addr())436 // Issue: may not reachable when host has multi-interface437 socksAddr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())438 reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)439 if err := reply.Write(conn); err != nil {440 log.Logf("[socks5-bind] %s <- %s : %s", conn.RemoteAddr(), addr, err)441 ln.Close()442 return443 }444 if Debug {445 log.Logf("[socks5-bind] %s <- %s\n%s", conn.RemoteAddr(), addr, reply)446 }447 log.Logf("[socks5-bind] %s - %s BIND ON %s OK", conn.RemoteAddr(), addr, socksAddr)448 var pconn net.Conn449 accept := func() <-chan error {450 errc := make(chan error, 1)451 go func() {452 defer close(errc)453 defer ln.Close()454 c, err := ln.AcceptTCP()455 if err != nil {456 errc <- err457 return458 }459 pconn = c460 }()461 return errc462 }463 pc1, pc2 := net.Pipe()464 pipe := func() <-chan error {465 errc := make(chan error, 1)466 go func() {467 defer close(errc)468 defer pc1.Close()469 errc <- transport(conn, pc1)470 }()471 return errc472 }473 defer pc2.Close()474 for {475 select {476 case err := <-accept():477 if err != nil || pconn == nil {478 log.Logf("[socks5-bind] %s <- %s : %v", conn.RemoteAddr(), addr, err)479 return480 }481 defer pconn.Close()482 reply := gosocks5.NewReply(gosocks5.Succeeded, toSocksAddr(pconn.RemoteAddr()))483 if err := reply.Write(pc2); err != nil {484 log.Logf("[socks5-bind] %s <- %s : %v", conn.RemoteAddr(), addr, err)485 }486 if Debug {487 log.Logf("[socks5-bind] %s <- %s\n%s", conn.RemoteAddr(), addr, reply)488 }489 log.Logf("[socks5-bind] %s <- %s PEER %s ACCEPTED", conn.RemoteAddr(), socksAddr, pconn.RemoteAddr())490 log.Logf("[socks5-bind] %s <-> %s", conn.RemoteAddr(), pconn.RemoteAddr())491 if err = transport(pc2, pconn); err != nil {492 log.Logf("[socks5-bind] %s - %s : %v", conn.RemoteAddr(), pconn.RemoteAddr(), err)493 }494 log.Logf("[socks5-bind] %s >-< %s", conn.RemoteAddr(), pconn.RemoteAddr())495 return496 case err := <-pipe():497 if err != nil {498 log.Logf("[socks5-bind] %s -> %s : %v", conn.RemoteAddr(), addr, err)499 }500 ln.Close()501 return502 }503 }504}505func (h *socks5Handler) handleUDPRelay(conn net.Conn, req *gosocks5.Request) {506 addr := req.Addr.String()507 if !Can("udp", addr, h.options.Whitelist, h.options.Blacklist) {508 log.Logf("[socks5-udp] Unauthorized to udp connect to %s", addr)509 rep := gosocks5.NewReply(gosocks5.NotAllowed, nil)510 rep.Write(conn)511 if Debug {512 log.Logf("[socks5-udp] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)513 }514 return515 }516 relay, err := net.ListenUDP("udp", nil)517 if err != nil {518 log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), relay.LocalAddr(), err)519 reply := gosocks5.NewReply(gosocks5.Failure, nil)520 reply.Write(conn)521 if Debug {522 log.Logf("[socks5-udp] %s <- %s\n%s", conn.RemoteAddr(), relay.LocalAddr(), reply)523 }524 return525 }526 defer relay.Close()527 socksAddr := toSocksAddr(relay.LocalAddr())528 socksAddr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String()) // replace the IP to the out-going interface's529 reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)530 if err := reply.Write(conn); err != nil {531 log.Logf("[socks5-udp] %s <- %s : %s", conn.RemoteAddr(), relay.LocalAddr(), err)532 return533 }534 if Debug {535 log.Logf("[socks5-udp] %s <- %s\n%s", conn.RemoteAddr(), reply.Addr, reply)536 }537 log.Logf("[socks5-udp] %s - %s BIND ON %s OK", conn.RemoteAddr(), relay.LocalAddr(), socksAddr)538 // serve as standard socks5 udp relay local <-> remote539 if h.options.Chain.IsEmpty() {540 peer, er := net.ListenUDP("udp", nil)541 if er != nil {542 log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), socksAddr, er)543 return544 }545 defer peer.Close()546 go h.transportUDP(relay, peer)547 log.Logf("[socks5-udp] %s <-> %s", conn.RemoteAddr(), socksAddr)548 if err := h.discardClientData(conn); err != nil {549 log.Logf("[socks5-udp] %s - %s : %s", conn.RemoteAddr(), socksAddr, err)550 }551 log.Logf("[socks5-udp] %s >-< %s", conn.RemoteAddr(), socksAddr)552 return553 }554 cc, err := h.options.Chain.Conn()555 // connection error556 if err != nil {557 log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), socksAddr, err)558 return559 }560 // forward udp local <-> tunnel561 defer cc.Close()562 cc, err = socks5Handshake(cc, h.options.Chain.LastNode().User)563 if err != nil {564 log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), socksAddr, err)565 return566 }567 cc.SetWriteDeadline(time.Now().Add(WriteTimeout))568 r := gosocks5.NewRequest(CmdUDPTun, nil)569 if err := r.Write(cc); err != nil {570 log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), cc.RemoteAddr(), err)571 return572 }573 cc.SetWriteDeadline(time.Time{})574 if Debug {575 log.Logf("[socks5-udp] %s -> %s\n%s", conn.RemoteAddr(), cc.RemoteAddr(), r)576 }577 cc.SetReadDeadline(time.Now().Add(ReadTimeout))578 reply, err = gosocks5.ReadReply(cc)579 if err != nil {580 log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), cc.RemoteAddr(), err)581 return582 }583 if Debug {584 log.Logf("[socks5-udp] %s <- %s\n%s", conn.RemoteAddr(), cc.RemoteAddr(), reply)585 }586 if reply.Rep != gosocks5.Succeeded {587 log.Logf("[socks5-udp] %s <- %s : udp associate failed", conn.RemoteAddr(), cc.RemoteAddr())588 return589 }590 cc.SetReadDeadline(time.Time{})591 log.Logf("[socks5-udp] %s <-> %s [tun: %s]", conn.RemoteAddr(), socksAddr, reply.Addr)592 go h.tunnelClientUDP(relay, cc)593 log.Logf("[socks5-udp] %s <-> %s", conn.RemoteAddr(), socksAddr)594 if err := h.discardClientData(conn); err != nil {595 log.Logf("[socks5-udp] %s - %s : %s", conn.RemoteAddr(), socksAddr, err)596 }597 log.Logf("[socks5-udp] %s >-< %s", conn.RemoteAddr(), socksAddr)598}599func (h *socks5Handler) discardClientData(conn net.Conn) (err error) {600 b := make([]byte, tinyBufferSize)601 n := 0602 for {603 n, err = conn.Read(b) // discard any data from tcp connection604 if err != nil {605 if err == io.EOF { // disconnect normally606 err = nil607 }608 break // client disconnected609 }610 log.Logf("[socks5-udp] read %d UNEXPECTED TCP data from client", n)611 }612 return613}614func (h *socks5Handler) transportUDP(relay, peer *net.UDPConn) (err error) {615 errc := make(chan error, 2)616 var clientAddr *net.UDPAddr617 go func() {618 b := make([]byte, largeBufferSize)619 for {620 n, laddr, err := relay.ReadFromUDP(b)621 if err != nil {622 errc <- err623 return624 }625 if clientAddr == nil {626 clientAddr = laddr627 }628 dgram, err := gosocks5.ReadUDPDatagram(bytes.NewReader(b[:n]))629 if err != nil {630 errc <- err631 return632 }633 raddr, err := net.ResolveUDPAddr("udp", dgram.Header.Addr.String())634 if err != nil {635 continue // drop silently636 }637 if h.options.Bypass.Contains(raddr.String()) {638 log.Log("[socks5-udp] [bypass] write to", raddr)639 continue // bypass640 }641 if _, err := peer.WriteToUDP(dgram.Data, raddr); err != nil {642 errc <- err643 return644 }645 if Debug {646 log.Logf("[socks5-udp] %s >>> %s length: %d", relay.LocalAddr(), raddr, len(dgram.Data))647 }648 }649 }()650 go func() {651 b := make([]byte, largeBufferSize)652 for {653 n, raddr, err := peer.ReadFromUDP(b)654 if err != nil {655 errc <- err656 return657 }658 if clientAddr == nil {659 continue660 }661 if h.options.Bypass.Contains(raddr.String()) {662 log.Log("[socks5-udp] [bypass] read from", raddr)663 continue // bypass664 }665 buf := bytes.Buffer{}666 dgram := gosocks5.NewUDPDatagram(gosocks5.NewUDPHeader(0, 0, toSocksAddr(raddr)), b[:n])667 dgram.Write(&buf)668 if _, err := relay.WriteToUDP(buf.Bytes(), clientAddr); err != nil {669 errc <- err670 return671 }672 if Debug {673 log.Logf("[socks5-udp] %s <<< %s length: %d", relay.LocalAddr(), raddr, len(dgram.Data))674 }675 }676 }()677 select {678 case err = <-errc:679 //log.Println("w exit", err)680 }681 return682}683func (h *socks5Handler) tunnelClientUDP(uc *net.UDPConn, cc net.Conn) (err error) {684 errc := make(chan error, 2)685 var clientAddr *net.UDPAddr686 go func() {687 b := make([]byte, mediumBufferSize)688 for {689 n, addr, err := uc.ReadFromUDP(b)690 if err != nil {691 log.Logf("[udp-tun] %s <- %s : %s", cc.RemoteAddr(), addr, err)692 errc <- err693 return694 }695 // glog.V(LDEBUG).Infof("read udp %d, % #x", n, b[:n])696 // pipe from relay to tunnel697 dgram, err := gosocks5.ReadUDPDatagram(bytes.NewReader(b[:n]))698 if err != nil {699 errc <- err700 return701 }702 if clientAddr == nil {703 clientAddr = addr704 }705 raddr := dgram.Header.Addr.String()706 if h.options.Bypass.Contains(raddr) {707 log.Log("[udp-tun] [bypass] write to", raddr)708 continue // bypass709 }710 dgram.Header.Rsv = uint16(len(dgram.Data))711 if err := dgram.Write(cc); err != nil {712 errc <- err713 return714 }715 if Debug {716 log.Logf("[udp-tun] %s >>> %s length: %d", uc.LocalAddr(), dgram.Header.Addr, len(dgram.Data))717 }718 }719 }()720 go func() {721 for {722 dgram, err := gosocks5.ReadUDPDatagram(cc)723 if err != nil {724 log.Logf("[udp-tun] %s -> 0 : %s", cc.RemoteAddr(), err)725 errc <- err726 return727 }728 // pipe from tunnel to relay729 if clientAddr == nil {730 continue731 }732 raddr := dgram.Header.Addr.String()733 if h.options.Bypass.Contains(raddr) {734 log.Log("[udp-tun] [bypass] read from", raddr)735 continue // bypass736 }737 dgram.Header.Rsv = 0738 buf := bytes.Buffer{}739 dgram.Write(&buf)740 if _, err := uc.WriteToUDP(buf.Bytes(), clientAddr); err != nil {741 errc <- err742 return743 }744 if Debug {745 log.Logf("[udp-tun] %s <<< %s length: %d", uc.LocalAddr(), dgram.Header.Addr, len(dgram.Data))746 }747 }748 }()749 select {750 case err = <-errc:751 }752 return753}754func (h *socks5Handler) handleUDPTunnel(conn net.Conn, req *gosocks5.Request) {755 // serve tunnel udp, tunnel <-> remote, handle tunnel udp request756 if h.options.Chain.IsEmpty() {757 addr := req.Addr.String()758 if !Can("rudp", addr, h.options.Whitelist, h.options.Blacklist) {759 log.Logf("[socks5-udp] Unauthorized to udp bind to %s", addr)760 return761 }762 bindAddr, _ := net.ResolveUDPAddr("udp", addr)763 uc, err := net.ListenUDP("udp", bindAddr)764 if err != nil {765 log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)766 return767 }768 defer uc.Close()769 socksAddr := toSocksAddr(uc.LocalAddr())770 socksAddr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())771 reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)772 if err := reply.Write(conn); err != nil {773 log.Logf("[socks5-udp] %s <- %s : %s", conn.RemoteAddr(), socksAddr, err)774 return775 }776 if Debug {777 log.Logf("[socks5-udp] %s <- %s\n%s", conn.RemoteAddr(), socksAddr, reply)778 }779 log.Logf("[socks5-udp] %s <-> %s", conn.RemoteAddr(), socksAddr)780 h.tunnelServerUDP(conn, uc)781 log.Logf("[socks5-udp] %s >-< %s", conn.RemoteAddr(), socksAddr)782 return783 }784 cc, err := h.options.Chain.Conn()785 // connection error786 if err != nil {787 log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)788 reply := gosocks5.NewReply(gosocks5.Failure, nil)789 reply.Write(conn)790 log.Logf("[socks5-udp] %s -> %s\n%s", conn.RemoteAddr(), req.Addr, reply)791 return792 }793 defer cc.Close()794 cc, err = socks5Handshake(cc, h.options.Chain.LastNode().User)795 if err != nil {796 log.Logf("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)797 return798 }799 // tunnel <-> tunnel, direct forwarding800 // note: this type of request forwarding is defined when starting server801 // so we don't need to authenticate it, as it's as explicit as whitelisting802 req.Write(cc)803 log.Logf("[socks5-udp] %s <-> %s [tun]", conn.RemoteAddr(), cc.RemoteAddr())804 transport(conn, cc)805 log.Logf("[socks5-udp] %s >-< %s [tun]", conn.RemoteAddr(), cc.RemoteAddr())806}807func (h *socks5Handler) tunnelServerUDP(cc net.Conn, uc *net.UDPConn) (err error) {808 errc := make(chan error, 2)809 go func() {810 b := make([]byte, mediumBufferSize)811 for {812 n, addr, err := uc.ReadFromUDP(b)813 if err != nil {814 log.Logf("[udp-tun] %s <- %s : %s", cc.RemoteAddr(), addr, err)815 errc <- err816 return817 }818 if h.options.Bypass.Contains(addr.String()) {819 log.Log("[udp-tun] [bypass] read from", addr)820 continue // bypass821 }822 // pipe from peer to tunnel823 dgram := gosocks5.NewUDPDatagram(824 gosocks5.NewUDPHeader(uint16(n), 0, toSocksAddr(addr)), b[:n])825 if err := dgram.Write(cc); err != nil {826 log.Logf("[udp-tun] %s <- %s : %s", cc.RemoteAddr(), dgram.Header.Addr, err)827 errc <- err828 return829 }830 if Debug {831 log.Logf("[udp-tun] %s <<< %s length: %d", cc.RemoteAddr(), dgram.Header.Addr, len(dgram.Data))832 }833 }834 }()835 go func() {836 for {837 dgram, err := gosocks5.ReadUDPDatagram(cc)838 if err != nil {839 log.Logf("[udp-tun] %s -> 0 : %s", cc.RemoteAddr(), err)840 errc <- err841 return842 }843 // pipe from tunnel to peer844 addr, err := net.ResolveUDPAddr("udp", dgram.Header.Addr.String())845 if err != nil {846 continue // drop silently847 }848 if h.options.Bypass.Contains(addr.String()) {849 log.Log("[udp-tun] [bypass] write to", addr)850 continue // bypass851 }852 if _, err := uc.WriteToUDP(dgram.Data, addr); err != nil {853 log.Logf("[udp-tun] %s -> %s : %s", cc.RemoteAddr(), addr, err)854 errc <- err855 return856 }857 if Debug {858 log.Logf("[udp-tun] %s >>> %s length: %d", cc.RemoteAddr(), addr, len(dgram.Data))859 }860 }861 }()862 select {863 case err = <-errc:864 }865 return866}867func (h *socks5Handler) handleMuxBind(conn net.Conn, req *gosocks5.Request) {868 if h.options.Chain.IsEmpty() {869 addr := req.Addr.String()870 if !Can("rtcp", addr, h.options.Whitelist, h.options.Blacklist) {871 log.Logf("Unauthorized to tcp mbind to %s", addr)872 return873 }874 h.muxBindOn(conn, addr)875 return876 }877 cc, err := h.options.Chain.Conn()878 if err != nil {879 log.Logf("[socks5-mbind] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)880 reply := gosocks5.NewReply(gosocks5.Failure, nil)881 reply.Write(conn)882 if Debug {883 log.Logf("[socks5-mbind] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, reply)884 }885 return886 }887 // forward request888 // note: this type of request forwarding is defined when starting server,889 // so we don't need to authenticate it, as it's as explicit as whitelisting.890 defer cc.Close()891 req.Write(cc)892 log.Logf("[socks5-mbind] %s <-> %s", conn.RemoteAddr(), cc.RemoteAddr())893 transport(conn, cc)894 log.Logf("[socks5-mbind] %s >-< %s", conn.RemoteAddr(), cc.RemoteAddr())895}896func (h *socks5Handler) muxBindOn(conn net.Conn, addr string) {897 bindAddr, _ := net.ResolveTCPAddr("tcp", addr)898 ln, err := net.ListenTCP("tcp", bindAddr) // strict mode: if the port already in use, it will return error899 if err != nil {900 log.Logf("[socks5-mbind] %s -> %s : %s", conn.RemoteAddr(), addr, err)901 gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)902 return903 }904 defer ln.Close()905 socksAddr := toSocksAddr(ln.Addr())906 // Issue: may not reachable when host has multi-interface.907 socksAddr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())908 reply := gosocks5.NewReply(gosocks5.Succeeded, socksAddr)909 if err := reply.Write(conn); err != nil {910 log.Logf("[socks5-mbind] %s <- %s : %s", conn.RemoteAddr(), addr, err)911 return912 }913 if Debug {914 log.Logf("[socks5-mbind] %s <- %s\n%s", conn.RemoteAddr(), addr, reply)915 }916 log.Logf("[socks5-mbind] %s - %s BIND ON %s OK", conn.RemoteAddr(), addr, socksAddr)917 // Upgrade connection to multiplex stream.918 s, err := smux.Client(conn, smux.DefaultConfig())919 if err != nil {920 log.Logf("[socks5-mbind] %s - %s : %s", conn.RemoteAddr(), socksAddr, err)921 return922 }923 log.Logf("[socks5-mbind] %s <-> %s", conn.RemoteAddr(), socksAddr)924 defer log.Logf("[socks5-mbind] %s >-< %s", conn.RemoteAddr(), socksAddr)925 session := &muxSession{926 conn: conn,927 session: s,928 }929 defer session.Close()930 go func() {931 for {932 conn, err := session.Accept()933 if err != nil {934 ln.Close()935 return936 }937 conn.Close() // we do not handle incoming connection.938 }939 }()940 for {941 cc, err := ln.Accept()942 if err != nil {943 // log.Logf("[socks5-mbind] %s <- %s : %v", conn.RemoteAddr(), socksAddr, err)944 return945 }946 log.Logf("[socks5-mbind] %s <- %s : ACCEPT peer %s",947 conn.RemoteAddr(), socksAddr, cc.RemoteAddr())948 go func(c net.Conn) {949 defer c.Close()950 sc, err := session.GetConn()951 if err != nil {952 log.Logf("[socks5-mbind] %s <- %s : %s", conn.RemoteAddr(), socksAddr, err)953 return954 }955 transport(sc, c)956 }(cc)957 }958}959func toSocksAddr(addr net.Addr) *gosocks5.Addr {960 host := "0.0.0.0"961 port := 0962 if addr != nil {963 h, p, _ := net.SplitHostPort(addr.String())964 host = h965 port, _ = strconv.Atoi(p)966 }967 return &gosocks5.Addr{968 Type: gosocks5.AddrIPv4,969 Host: host,970 Port: uint16(port),971 }972}973type socks4Handler struct {974 options *HandlerOptions975}976// SOCKS4Handler creates a server Handler for SOCKS4(A) proxy server.977func SOCKS4Handler(opts ...HandlerOption) Handler {978 h := &socks4Handler{}979 h.Init(opts...)980 return h981}982func (h *socks4Handler) Init(options ...HandlerOption) {983 if h.options == nil {984 h.options = &HandlerOptions{}985 }986 for _, opt := range options {987 opt(h.options)988 }989}990func (h *socks4Handler) Handle(conn net.Conn) {991 defer conn.Close()992 req, err := gosocks4.ReadRequest(conn)993 if err != nil {994 log.Log("[socks4]", err)995 return996 }997 if Debug {998 log.Logf("[socks4] %s -> %s\n%s", conn.RemoteAddr(), req.Addr, req)999 }1000 switch req.Cmd {1001 case gosocks4.CmdConnect:1002 log.Logf("[socks4-connect] %s -> %s", conn.RemoteAddr(), req.Addr)1003 h.handleConnect(conn, req)1004 case gosocks4.CmdBind:1005 log.Logf("[socks4-bind] %s - %s", conn.RemoteAddr(), req.Addr)1006 h.handleBind(conn, req)1007 default:1008 log.Logf("[socks4] Unrecognized request: %d", req.Cmd)1009 }1010}1011func (h *socks4Handler) handleConnect(conn net.Conn, req *gosocks4.Request) {1012 addr := req.Addr.String()1013 if !Can("tcp", addr, h.options.Whitelist, h.options.Blacklist) {1014 log.Logf("[socks4-connect] Unauthorized to tcp connect to %s", addr)1015 rep := gosocks4.NewReply(gosocks4.Rejected, nil)1016 rep.Write(conn)1017 if Debug {1018 log.Logf("[socks4-connect] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)1019 }1020 return1021 }1022 if h.options.Bypass.Contains(addr) {1023 log.Log("[socks4-connect] [bypass]", addr)1024 rep := gosocks4.NewReply(gosocks4.Rejected, nil)1025 rep.Write(conn)1026 if Debug {1027 log.Logf("[socks4-connect] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)1028 }1029 return1030 }1031 cc, err := h.options.Chain.Dial(addr,1032 RetryChainOption(h.options.Retries),1033 TimeoutChainOption(h.options.Timeout),1034 )1035 if err != nil {1036 log.Logf("[socks4-connect] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)1037 rep := gosocks4.NewReply(gosocks4.Failed, nil)1038 rep.Write(conn)1039 if Debug {1040 log.Logf("[socks4-connect] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)1041 }1042 return1043 }1044 defer cc.Close()1045 rep := gosocks4.NewReply(gosocks4.Granted, nil)1046 if err := rep.Write(conn); err != nil {1047 log.Logf("[socks4-connect] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)1048 return1049 }1050 if Debug {1051 log.Logf("[socks4-connect] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)1052 }1053 log.Logf("[socks4-connect] %s <-> %s", conn.RemoteAddr(), req.Addr)1054 transport(conn, cc)1055 log.Logf("[socks4-connect] %s >-< %s", conn.RemoteAddr(), req.Addr)1056}1057func (h *socks4Handler) handleBind(conn net.Conn, req *gosocks4.Request) {1058 // TODO: serve socks4 bind1059 if h.options.Chain.IsEmpty() {1060 reply := gosocks4.NewReply(gosocks4.Rejected, nil)1061 reply.Write(conn)1062 if Debug {1063 log.Logf("[socks4-bind] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, reply)1064 }1065 return1066 }1067 cc, err := h.options.Chain.Conn()1068 // connection error1069 if err != nil && err != ErrEmptyChain {1070 log.Logf("[socks4-bind] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)1071 reply := gosocks4.NewReply(gosocks4.Failed, nil)1072 reply.Write(conn)1073 if Debug {1074 log.Logf("[socks4-bind] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, reply)1075 }1076 return1077 }1078 defer cc.Close()1079 // forward request1080 req.Write(cc)1081 log.Logf("[socks4-bind] %s <-> %s", conn.RemoteAddr(), cc.RemoteAddr())1082 transport(conn, cc)1083 log.Logf("[socks4-bind] %s >-< %s", conn.RemoteAddr(), cc.RemoteAddr())1084}1085func getSOCKS5UDPTunnel(chain *Chain, addr net.Addr) (net.Conn, error) {1086 conn, err := chain.Conn()1087 if err != nil {1088 return nil, err1089 }1090 cc, err := socks5Handshake(conn, chain.LastNode().User)1091 if err != nil {1092 conn.Close()1093 return nil, err1094 }1095 conn = cc1096 conn.SetWriteDeadline(time.Now().Add(WriteTimeout))1097 req := gosocks5.NewRequest(CmdUDPTun, toSocksAddr(addr))...

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udp.go

Source:udp.go Github

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...23)24type UdpPacket struct {25 Buf []byte26 LocalAddr net.Addr27 RemoteAddr net.Addr28}29type FakeUdpConn struct {30 log.Logger31 l *UdpListener32 localAddr net.Addr33 remoteAddr net.Addr34 packets chan []byte35 closeFlag bool36 lastActive time.Time37 mu sync.RWMutex38}39func NewFakeUdpConn(l *UdpListener, laddr, raddr net.Addr) *FakeUdpConn {40 fc := &FakeUdpConn{41 Logger: log.NewPrefixLogger(""),42 l: l,43 localAddr: laddr,44 remoteAddr: raddr,45 packets: make(chan []byte, 20),46 }47 go func() {48 for {49 time.Sleep(5 * time.Second)50 fc.mu.RLock()51 if time.Now().Sub(fc.lastActive) > 10*time.Second {52 fc.mu.RUnlock()53 fc.Close()54 break55 }56 fc.mu.RUnlock()57 }58 }()59 return fc60}61func (c *FakeUdpConn) putPacket(content []byte) {62 defer func() {63 if err := recover(); err != nil {64 }65 }()66 select {67 case c.packets <- content:68 default:69 }70}71func (c *FakeUdpConn) Read(b []byte) (n int, err error) {72 content, ok := <-c.packets73 if !ok {74 return 0, io.EOF75 }76 c.mu.Lock()77 c.lastActive = time.Now()78 c.mu.Unlock()79 if len(b) < len(content) {80 n = len(b)81 } else {82 n = len(content)83 }84 copy(b, content)85 return n, nil86}87func (c *FakeUdpConn) Write(b []byte) (n int, err error) {88 c.mu.RLock()89 if c.closeFlag {90 c.mu.RUnlock()91 return 0, io.ErrClosedPipe92 }93 c.mu.RUnlock()94 packet := &UdpPacket{95 Buf: b,96 LocalAddr: c.localAddr,97 RemoteAddr: c.remoteAddr,98 }99 c.l.writeUdpPacket(packet)100 c.mu.Lock()101 c.lastActive = time.Now()102 c.mu.Unlock()103 return len(b), nil104}105func (c *FakeUdpConn) Close() error {106 c.mu.Lock()107 defer c.mu.Unlock()108 if !c.closeFlag {109 c.closeFlag = true110 close(c.packets)111 }112 return nil113}114func (c *FakeUdpConn) IsClosed() bool {115 c.mu.RLock()116 defer c.mu.RUnlock()117 return c.closeFlag118}119func (c *FakeUdpConn) LocalAddr() net.Addr {120 return c.localAddr121}122func (c *FakeUdpConn) RemoteAddr() net.Addr {123 return c.remoteAddr124}125func (c *FakeUdpConn) SetDeadline(t time.Time) error {126 return nil127}128func (c *FakeUdpConn) SetReadDeadline(t time.Time) error {129 return nil130}131func (c *FakeUdpConn) SetWriteDeadline(t time.Time) error {132 return nil133}134type UdpListener struct {135 net.Addr136 accept chan Conn137 writeCh chan *UdpPacket138 readConn net.Conn139 closeFlag bool140 fakeConns map[string]*FakeUdpConn141 log.Logger142}143func ListenUDP(bindAddr string, bindPort int) (l *UdpListener, err error) {144 udpAddr, err := net.ResolveUDPAddr("udp", fmt.Sprintf("%s:%d", bindAddr, bindPort))145 if err != nil {146 return l, err147 }148 readConn, err := net.ListenUDP("udp", udpAddr)149 l = &UdpListener{150 Addr: udpAddr,151 accept: make(chan Conn),152 writeCh: make(chan *UdpPacket, 1000),153 fakeConns: make(map[string]*FakeUdpConn),154 Logger: log.NewPrefixLogger(""),155 }156 // for reading157 go func() {158 for {159 buf := pool.GetBuf(1450)160 n, remoteAddr, err := readConn.ReadFromUDP(buf)161 if err != nil {162 close(l.accept)163 close(l.writeCh)164 return165 }166 fakeConn, exist := l.fakeConns[remoteAddr.String()]167 if !exist || fakeConn.IsClosed() {168 fakeConn = NewFakeUdpConn(l, l.Addr, remoteAddr)169 l.fakeConns[remoteAddr.String()] = fakeConn170 }171 fakeConn.putPacket(buf[:n])172 l.accept <- fakeConn173 }174 }()175 // for writing176 go func() {177 for {178 packet, ok := <-l.writeCh179 if !ok {180 return181 }182 if addr, ok := packet.RemoteAddr.(*net.UDPAddr); ok {183 readConn.WriteToUDP(packet.Buf, addr)184 }185 }186 }()187 return188}189func (l *UdpListener) writeUdpPacket(packet *UdpPacket) (err error) {190 defer func() {191 if errRet := recover(); errRet != nil {192 err = fmt.Errorf("udp write closed listener")193 l.Info("udp write closed listener")194 }195 }()196 l.writeCh <- packet197 return198}199func (l *UdpListener) WriteMsg(buf []byte, remoteAddr *net.UDPAddr) (err error) {200 // only set remote addr here201 packet := &UdpPacket{202 Buf: buf,203 RemoteAddr: remoteAddr,204 }205 err = l.writeUdpPacket(packet)206 return207}208func (l *UdpListener) Accept() (Conn, error) {209 conn, ok := <-l.accept210 if !ok {211 return conn, fmt.Errorf("channel for udp listener closed")212 }213 return conn, nil214}215func (l *UdpListener) Close() error {216 if !l.closeFlag {217 l.closeFlag = true...

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RemoteAddr

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1import (2func main() {3 conn, err := net.Dial("tcp", "golang.org:80")4 if err != nil {5 fmt.Println(err)6 }7 defer conn.Close()8 fmt.Println(conn.RemoteAddr())9}

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1import (2func main() {3 if len(os.Args) != 2 {4 fmt.Fprintf(os.Stderr, "Usage: %s host:port ", os.Args[0])5 os.Exit(1)6 }7 tcpAddr, err := net.ResolveTCPAddr("tcp4", service)8 checkError(err)9 conn, err := net.DialTCP("tcp", nil, tcpAddr)10 checkError(err)11 _, err = conn.Write([]byte("HEAD / HTTP/1.0\r12 checkError(err)13 result, err := readFully(conn)14 checkError(err)15 fmt.Println(string(result))16 os.Exit(0)17}18func readFully(conn net.Conn) ([]byte, error) {19 defer conn.Close()20 result := bytes.NewBuffer(nil)21 for {22 n, err := conn.Read(buf[0:])23 result.Write(buf[0:n])24 if err != nil {25 if err == io.EOF {26 }27 }28 }29 return result.Bytes(), nil30}31func checkError(err error) {32 if err != nil {33 fmt.Fprintf(os.Stderr, "Fatal error: %s", err.Error())34 os.Exit(1)35 }36}

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RemoteAddr

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1import (2func main() {3 conn, err := net.Dial("tcp", "golang.org:80")4 if err != nil {5 }6 defer conn.Close()7 fmt.Println(conn.RemoteAddr())8}

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1import (2func main() {3 if len(os.Args) != 2 {4 fmt.Fprintf(os.Stderr, "Usage: %s ip-addr", os.Args[0])5 os.Exit(1)6 }7 addr := net.ParseIP(name)8 if addr == nil {9 fmt.Println("Invalid address")10 } else {11 fmt.Println("The address is", addr.String())12 }13 os.Exit(0)14}

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RemoteAddr

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1import (2func main() {3conn, err := net.Dial("tcp", "golang.org:80")4if err != nil {5}6defer conn.Close()7fmt.Println(conn.RemoteAddr())8}

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RemoteAddr

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1import (2func main() {3conn, err := net.Dial("tcp", "google.com:80")4if err != nil {5fmt.Println(err)6}7defer conn.Close()8fmt.Println(conn.RemoteAddr())9}

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1import (2func main() {3 conn, err := net.Dial("tcp", "google.com:80")4 if err != nil {5 fmt.Println("Error connecting to server")6 }7 defer conn.Close()8 fmt.Println("Connected to server")9 fmt.Println("Remote Address:", conn.RemoteAddr())10}

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1import (2func main() {3 conn, _ := net.Dial("tcp", "www.google.com:80")4 fmt.Println(conn.RemoteAddr())5 conn.Close()6}

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1import (2func main() {3 ln, err := net.Listen("tcp", ":8080")4 if err != nil {5 log.Fatal(err)6 }7 defer ln.Close()8 for {9 conn, err := ln.Accept()10 if err != nil {11 log.Println(err)12 }13 fmt.Println(conn.RemoteAddr())14 conn.Close()15 }16}17import (18func main() {19 ln, err := net.ListenUDP("udp", &net.UDPAddr{Port: 8080})20 if err != nil {21 log.Fatal(err)22 }23 defer ln.Close()24 for {25 b := make([]byte, 1500)26 n, addr, err := ln.ReadFromUDP(b)27 if err != nil {28 log.Println(err)29 }30 fmt.Println(addr)31 fmt.Println(string(b[:n]))32 }33}34import (35func main() {36 ln, err := net.ListenPacket("udp", ":8080")37 if err != nil {38 log.Fatal(err)39 }40 defer ln.Close()41 for {42 b := make([]byte, 1500)43 n, addr, err := ln.ReadFrom(b)44 if err != nil {45 log.Println(err)46 }47 fmt.Println(addr)48 fmt.Println(string(b[:n]))49 }50}51import (52func main() {53 ln, err := net.ListenPacket("udp", ":8080")54 if err != nil {55 log.Fatal(err)56 }57 defer ln.Close()58 for {59 b := make([]byte, 1500)60 n, addr, err := ln.ReadFrom(b)61 if err != nil {62 log.Println(err)63 }64 fmt.Println(addr

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1import (2func main() {3 conn, err := net.Dial("tcp", "golang.org:80")4 if err != nil {5 fmt.Println(err)6 }7 defer conn.Close()8 fmt.Println(conn.RemoteAddr())9}

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