add tcp node client server

chain.go

@@ -560,3 +560,35 @@ func (c *ProxyChain) getQuicConn(header http.Header) (net.Conn, error) {
 type Chain struct {
 	nodes []Node
 }
+
+func (c *Chain) Dial(addr string) (net.Conn, error) {
+	if len(c.nodes) == 0 {
+		return net.Dial("tcp", addr)
+	}
+
+	nodes := c.nodes
+	conn, err := nodes[0].Client().Connect()
+	if err != nil {
+		return nil, err
+	}
+
+	for i, node := range nodes {
+		if i == len(nodes)-1 {
+			break
+		}
+
+		cn, err := node.Client().Dial(conn, nodes[i+1].Options().BaseOptions().Addr)
+		if err != nil {
+			conn.Close()
+			return nil, err
+		}
+		conn = cn
+	}
+
+	cn, err := nodes[len(nodes)-1].Client().Dial(conn, addr)
+	if err != nil {
+		conn.Close()
+		return nil, err
+	}
+	return cn, nil
+}

options.go

@@ -7,41 +7,32 @@ import (
 
 // Options holds options of node
 type Options interface {
-	Get(opt string) (v interface{})
+	BaseOptions() *BaseOptions
-	Set(opt string, v interface{})
 }
 
 type Option func(Options)
 
-type DefaultOptions struct {
+type BaseOptions struct {
 	Addr      string `opt:"addr"`      // [host]:port
 	Protocol  string `opt:"protocol"`  // protocol: http/socks5/ss
 	Transport string `opt:"transport"` // transport: ws/wss/tls/http2/tcp/udp/rtcp/rudp
 }
 
-func (o *DefaultOptions) Get(opt string) interface{} {
-	return GetOption(o, opt)
-}
-
-func (o *DefaultOptions) Set(opt string, v interface{}) {
-	SetOption(o, opt, v)
-}
-
 func AddrOption(a string) Option {
 	return func(opts Options) {
-		SetOption(opts, "addr", a)
+		opts.BaseOptions().Addr = a
 	}
 }
 
 func ProtocolOption(p string) Option {
 	return func(opts Options) {
-		SetOption(opts, "protocol", p)
+		opts.BaseOptions().Protocol = p
 	}
 }
 
 func TransportOption(t string) Option {
 	return func(opts Options) {
-		SetOption(opts, "transport", t)
+		opts.BaseOptions().Transport = t
 	}
 }
 

server.go

@@ -298,5 +298,8 @@ func (_ *ProxyServer) transport(conn1, conn2 net.Conn) (err error) {
 
 // Server represents a node server
 type Server interface {
+	Chain() *Chain
+	SetChain(chain *Chain)
+	Options() Options
 	Run() error
 }

socks/selector.go

@@ -0,0 +1,167 @@
+package socks
+
+import (
+	"crypto/tls"
+	"net"
+	"net/url"
+
+	"github.com/ginuerzh/gosocks5"
+	"github.com/golang/glog"
+)
+
+const (
+	MethodTLS     uint8 = 0x80 // extended method for tls
+	MethodTLSAuth uint8 = 0x82 // extended method for tls+auth
+)
+
+const (
+	CmdUdpTun uint8 = 0xF3 // extended method for udp over tcp
+)
+
+type ClientSelector struct {
+	methods   []uint8
+	User      *url.Userinfo
+	TLSConfig *tls.Config
+}
+
+func (selector *ClientSelector) Methods() []uint8 {
+	return selector.methods
+}
+
+func (selector *ClientSelector) AddMethod(methods ...uint8) {
+	selector.methods = append(selector.methods, methods...)
+}
+
+func (selector *ClientSelector) Select(methods ...uint8) (method uint8) {
+	return
+}
+
+func (selector *ClientSelector) OnSelected(method uint8, conn net.Conn) (net.Conn, error) {
+	switch method {
+	case MethodTLS:
+		conn = tls.Client(conn, selector.TLSConfig)
+
+	case gosocks5.MethodUserPass, MethodTLSAuth:
+		if method == MethodTLSAuth {
+			conn = tls.Client(conn, selector.TLSConfig)
+		}
+
+		var username, password string
+		if selector.User != nil {
+			username = selector.User.Username()
+			password, _ = selector.User.Password()
+		}
+
+		req := gosocks5.NewUserPassRequest(gosocks5.UserPassVer, username, password)
+		if err := req.Write(conn); err != nil {
+			glog.Infoln("socks5 auth:", err)
+			return nil, err
+		}
+		glog.Infoln(req)
+
+		resp, err := gosocks5.ReadUserPassResponse(conn)
+		if err != nil {
+			glog.Infoln("socks5 auth:", err)
+			return nil, err
+		}
+		glog.Infoln(resp)
+
+		if resp.Status != gosocks5.Succeeded {
+			return nil, gosocks5.ErrAuthFailure
+		}
+	case gosocks5.MethodNoAcceptable:
+		return nil, gosocks5.ErrBadMethod
+	}
+
+	return conn, nil
+}
+
+type ServerSelector struct {
+	methods   []uint8
+	users     []*url.Userinfo
+	tlsConfig *tls.Config
+}
+
+func (selector *ServerSelector) Methods() []uint8 {
+	return selector.methods
+}
+
+func (selector *ServerSelector) Select(methods ...uint8) (method uint8) {
+	glog.Infof("%d %d %v", gosocks5.Ver5, len(methods), methods)
+
+	method = gosocks5.MethodNoAuth
+	for _, m := range methods {
+		if m == MethodTLS {
+			method = m
+			break
+		}
+	}
+
+	// when user/pass is set, auth is mandatory
+	if selector.users != nil {
+		if method == gosocks5.MethodNoAuth {
+			method = gosocks5.MethodUserPass
+		}
+		if method == MethodTLS {
+			method = MethodTLSAuth
+		}
+	}
+
+	return
+}
+
+func (selector *ServerSelector) OnSelected(method uint8, conn net.Conn) (net.Conn, error) {
+	glog.Infof("%d %d", gosocks5.Ver5, method)
+
+	switch method {
+	case MethodTLS:
+		conn = tls.Server(conn, selector.tlsConfig)
+
+	case gosocks5.MethodUserPass, MethodTLSAuth:
+		if method == MethodTLSAuth {
+			conn = tls.Server(conn, selector.tlsConfig)
+		}
+
+		req, err := gosocks5.ReadUserPassRequest(conn)
+		if err != nil {
+			glog.Infoln("[socks5-auth]", err)
+			return nil, err
+		}
+		glog.Infoln("[socks5]", req.String())
+
+		valid := false
+		for _, user := range selector.users {
+			username := user.Username()
+			password, _ := user.Password()
+			if (req.Username == username && req.Password == password) ||
+				(req.Username == username && password == "") ||
+				(username == "" && req.Password == password) {
+				valid = true
+				break
+			}
+		}
+		if len(selector.users) > 0 && !valid {
+			resp := gosocks5.NewUserPassResponse(gosocks5.UserPassVer, gosocks5.Failure)
+			if err := resp.Write(conn); err != nil {
+				glog.Infoln("[socks5-auth]", err)
+				return nil, err
+			}
+			glog.Infoln("[socks5]", resp)
+			glog.Infoln("[socks5-auth] proxy authentication required")
+
+			return nil, gosocks5.ErrAuthFailure
+		}
+
+		resp := gosocks5.NewUserPassResponse(gosocks5.UserPassVer, gosocks5.Succeeded)
+		if err := resp.Write(conn); err != nil {
+			glog.Infoln("[socks5-auth]", err)
+			return nil, err
+		}
+		glog.Infoln(resp)
+
+	case gosocks5.MethodNoAcceptable:
+		return nil, gosocks5.ErrBadMethod
+	}
+
+	return conn, nil
+}

ss.go

@@ -5,13 +5,14 @@ import (
 	"encoding/binary"
 	"errors"
 	"fmt"
-	"github.com/ginuerzh/gosocks5"
-	"github.com/golang/glog"
-	ss "github.com/shadowsocks/shadowsocks-go/shadowsocks"
 	"io"
 	"net"
 	"strconv"
 	"time"
+
+	"github.com/ginuerzh/gosocks5"
+	"github.com/golang/glog"
+	ss "github.com/shadowsocks/shadowsocks-go/shadowsocks"
 )
 
 const (

ssocks/ssocks.go

@@ -0,0 +1,165 @@
+package ssocks
+
+import (
+	"encoding/binary"
+	"fmt"
+	"io"
+	"net"
+	"net/url"
+	"strconv"
+	"time"
+
+	"github.com/go-log/log"
+
+	"github.com/ginuerzh/gost"
+	ss "github.com/shadowsocks/shadowsocks-go/shadowsocks"
+)
+
+// Due to in/out byte length is inconsistent of the shadowsocks.Conn.Write,
+// we wrap around it to make io.Copy happy
+type shadowConn struct {
+	conn net.Conn
+}
+
+func NewConn(conn net.Conn) net.Conn {
+	return &shadowConn{conn: conn}
+}
+
+func (c *shadowConn) Read(b []byte) (n int, err error) {
+	return c.conn.Read(b)
+}
+
+func (c *shadowConn) Write(b []byte) (n int, err error) {
+	n = len(b) // force byte length consistent
+	_, err = c.conn.Write(b)
+	return
+}
+
+func (c *shadowConn) Close() error {
+	return c.conn.Close()
+}
+
+func (c *shadowConn) LocalAddr() net.Addr {
+	return c.conn.LocalAddr()
+}
+
+func (c *shadowConn) RemoteAddr() net.Addr {
+	return c.conn.RemoteAddr()
+}
+
+func (c *shadowConn) SetDeadline(t time.Time) error {
+	return c.conn.SetDeadline(t)
+}
+
+func (c *shadowConn) SetReadDeadline(t time.Time) error {
+	return c.conn.SetReadDeadline(t)
+}
+
+func (c *shadowConn) SetWriteDeadline(t time.Time) error {
+	return c.conn.SetWriteDeadline(t)
+}
+
+const (
+	idType  = 0 // address type index
+	idIP0   = 1 // ip addres start index
+	idDmLen = 1 // domain address length index
+	idDm0   = 2 // domain address start index
+
+	typeIPv4 = 1 // type is ipv4 address
+	typeDm   = 3 // type is domain address
+	typeIPv6 = 4 // type is ipv6 address
+
+	lenIPv4     = net.IPv4len + 2 // ipv4 + 2port
+	lenIPv6     = net.IPv6len + 2 // ipv6 + 2port
+	lenDmBase   = 2               // 1addrLen + 2port, plus addrLen
+	lenHmacSha1 = 10
+)
+
+type ShadowServer struct {
+	conn net.Conn
+	base gost.Server
+}
+
+func NewServer(conn net.Conn, cipher *url.Userinfo, base gost.Server) (*ShadowServer, error) {
+	method := cipher.Username()
+	password, _ := cipher.Password()
+	cp, err := ss.NewCipher(method, password)
+	if err != nil {
+		return nil, err
+	}
+	return &ShadowServer{conn: ss.NewConn(conn, cp), base: base}, nil
+}
+
+func (s *ShadowServer) Serve() error {
+	log.Logf("[ss] %s - %s", s.conn.RemoteAddr(), s.conn.LocalAddr())
+
+	addr, err := s.getRequest()
+	if err != nil {
+		log.Logf("[ss] %s - %s : %s", s.conn.RemoteAddr(), s.conn.LocalAddr(), err)
+		return err
+	}
+	log.Logf("[ss] %s -> %s", s.conn.RemoteAddr(), addr)
+
+	cc, err := s.base.Chain().Dial(addr)
+	if err != nil {
+		log.Logf("[ss] %s -> %s : %s", s.conn.RemoteAddr(), addr, err)
+		return err
+	}
+	defer cc.Close()
+
+	log.Logf("[ss] %s <-> %s", s.conn.RemoteAddr(), addr)
+	defer log.Logf("[ss] %s >-< %s", s.conn.RemoteAddr(), addr)
+
+	return gost.Transport(&shadowConn{conn: s.conn}, cc)
+}
+
+// This function is copied from shadowsocks library with some modification.
+func (s *ShadowServer) getRequest() (host string, err error) {
+	// buf size should at least have the same size with the largest possible
+	// request size (when addrType is 3, domain name has at most 256 bytes)
+	// 1(addrType) + 1(lenByte) + 256(max length address) + 2(port)
+	buf := make([]byte, gost.SmallBufferSize)
+
+	// read till we get possible domain length field
+	s.conn.SetReadDeadline(time.Now().Add(30 * time.Second))
+	if _, err = io.ReadFull(s.conn, buf[:idType+1]); err != nil {
+		return
+	}
+
+	var reqStart, reqEnd int
+	addrType := buf[idType]
+	switch addrType & ss.AddrMask {
+	case typeIPv4:
+		reqStart, reqEnd = idIP0, idIP0+lenIPv4
+	case typeIPv6:
+		reqStart, reqEnd = idIP0, idIP0+lenIPv6
+	case typeDm:
+		if _, err = io.ReadFull(s.conn, buf[idType+1:idDmLen+1]); err != nil {
+			return
+		}
+		reqStart, reqEnd = idDm0, int(idDm0+buf[idDmLen]+lenDmBase)
+	default:
+		err = fmt.Errorf("addr type %d not supported", addrType&ss.AddrMask)
+		return
+	}
+
+	if _, err = io.ReadFull(s.conn, buf[reqStart:reqEnd]); err != nil {
+		return
+	}
+
+	// Return string for typeIP is not most efficient, but browsers (Chrome,
+	// Safari, Firefox) all seems using typeDm exclusively. So this is not a
+	// big problem.
+	switch addrType & ss.AddrMask {
+	case typeIPv4:
+		host = net.IP(buf[idIP0 : idIP0+net.IPv4len]).String()
+	case typeIPv6:
+		host = net.IP(buf[idIP0 : idIP0+net.IPv6len]).String()
+	case typeDm:
+		host = string(buf[idDm0 : idDm0+buf[idDmLen]])
+	}
+	// parse port
+	port := binary.BigEndian.Uint16(buf[reqEnd-2 : reqEnd])
+	host = net.JoinHostPort(host, strconv.Itoa(int(port)))
+	return
+}

tcp/client.go

@@ -1,12 +1,31 @@
 package tcp
 
-import "net"
+import (
+	"bufio"
+	"crypto/tls"
+	"encoding/base64"
+	"errors"
+	"fmt"
+	"net"
+	"net/http"
+	"net/http/httputil"
+	"net/url"
+	"strconv"
+
+	"github.com/ginuerzh/gosocks4"
+	"github.com/ginuerzh/gosocks5"
+	"github.com/ginuerzh/gost/socks"
+	"github.com/ginuerzh/gost/ssocks"
+	"github.com/go-log/log"
+	ss "github.com/shadowsocks/shadowsocks-go/shadowsocks"
+)
 
 type nodeClient struct {
+	options *nodeOptions
 }
 
 func (c *nodeClient) Connect() (net.Conn, error) {
-	return nil, nil
+	return net.Dial("tcp", c.options.BaseOptions().Addr)
 }
 
 func (c *nodeClient) Handshake(conn net.Conn) (net.Conn, error) {
@@ -14,5 +33,157 @@ func (c *nodeClient) Handshake(conn net.Conn) (net.Conn, error) {
 }
 
 func (c *nodeClient) Dial(conn net.Conn, addr string) (net.Conn, error) {
-	return nil, nil
+	if c.options.BaseOptions().Protocol == "socks5" {
+		selector := &socks.ClientSelector{
+			TLSConfig: &tls.Config{
+				InsecureSkipVerify: !c.options.secureVerify,
+				ServerName:         c.options.serverName,
+			},
+		}
+		selector.AddMethod(
+			gosocks5.MethodNoAuth,
+			gosocks5.MethodUserPass,
+			socks.MethodTLS,
+		)
+		if len(c.options.users) > 0 {
+			selector.User = &c.options.users[0]
+		}
+
+		cc := gosocks5.ClientConn(conn, selector)
+		if err := cc.Handleshake(); err != nil {
+			return nil, err
+		}
+		conn = cc
+	}
+
+	return c.dial(conn, addr)
+}
+
+func (c *nodeClient) dial(conn net.Conn, addr string) (net.Conn, error) {
+	protocol := c.options.BaseOptions().Protocol
+	switch protocol {
+	case "ss": // shadowsocks
+		rawaddr, err := ss.RawAddr(addr)
+		if err != nil {
+			return nil, err
+		}
+
+		var method, password string
+		if len(c.options.users) > 0 {
+			method = c.options.users[0].Username()
+			password, _ = c.options.users[0].Password()
+		}
+
+		cipher, err := ss.NewCipher(method, password)
+		if err != nil {
+			return nil, err
+		}
+
+		sc, err := ss.DialWithRawAddrConn(rawaddr, conn, cipher)
+		if err != nil {
+			return nil, err
+		}
+		conn = ssocks.NewConn(sc)
+
+	case "socks5":
+		host, port, err := net.SplitHostPort(addr)
+		if err != nil {
+			return nil, err
+		}
+		p, _ := strconv.Atoi(port)
+		req := gosocks5.NewRequest(gosocks5.CmdConnect, &gosocks5.Addr{
+			Type: gosocks5.AddrDomain,
+			Host: host,
+			Port: uint16(p),
+		})
+		if err := req.Write(conn); err != nil {
+			return nil, err
+		}
+		log.Log("[socks5]", req)
+
+		reply, err := gosocks5.ReadReply(conn)
+		if err != nil {
+			return nil, err
+		}
+		log.Log("[socks5]", reply)
+		if reply.Rep != gosocks5.Succeeded {
+			return nil, errors.New("Service unavailable")
+		}
+
+	case "socks4", "socks4a":
+		atype := gosocks4.AddrDomain
+		host, port, err := net.SplitHostPort(addr)
+		if err != nil {
+			return nil, err
+		}
+		p, _ := strconv.Atoi(port)
+
+		if protocol == "socks4" {
+			taddr, err := net.ResolveTCPAddr("tcp4", addr)
+			if err != nil {
+				return nil, err
+			}
+			host = taddr.IP.String()
+			p = taddr.Port
+			atype = gosocks4.AddrIPv4
+		}
+		req := gosocks4.NewRequest(gosocks4.CmdConnect,
+			&gosocks4.Addr{Type: atype, Host: host, Port: uint16(p)}, nil)
+		if err := req.Write(conn); err != nil {
+			return nil, err
+		}
+		log.Logf("[%s] %s", protocol, req)
+
+		reply, err := gosocks4.ReadReply(conn)
+		if err != nil {
+			return nil, err
+		}
+		log.Logf("[%s] %s", protocol, reply)
+
+		if reply.Code != gosocks4.Granted {
+			return nil, fmt.Errorf("%s: code=%d", protocol, reply.Code)
+		}
+	case "http":
+		fallthrough
+	default:
+		req := &http.Request{
+			Method:     http.MethodConnect,
+			URL:        &url.URL{Host: addr},
+			Host:       addr,
+			ProtoMajor: 1,
+			ProtoMinor: 1,
+			Header:     make(http.Header),
+		}
+		req.Header.Set("Proxy-Connection", "keep-alive")
+		if len(c.options.users) > 0 {
+			user := c.options.users[0]
+			s := user.String()
+			if _, set := user.Password(); !set {
+				s += ":"
+			}
+			req.Header.Set("Proxy-Authorization",
+				"Basic "+base64.StdEncoding.EncodeToString([]byte(s)))
+		}
+		if err := req.Write(conn); err != nil {
+			return nil, err
+		}
+		//if glog.V(LDEBUG) {
+		dump, _ := httputil.DumpRequest(req, false)
+		log.Log(string(dump))
+		//}
+
+		resp, err := http.ReadResponse(bufio.NewReader(conn), req)
+		if err != nil {
+			return nil, err
+		}
+		//if glog.V(LDEBUG) {
+		dump, _ = httputil.DumpResponse(resp, false)
+		log.Log(string(dump))
+		//}
+		if resp.StatusCode != http.StatusOK {
+			return nil, fmt.Errorf("%d %s", resp.StatusCode, resp.Status)
+		}
+	}
+
+	return conn, nil
 }

tcp/node.go

@@ -5,18 +5,21 @@ import (
 )
 
 type tcpNode struct {
-	options *tcpNodeOptions
+	options *nodeOptions
 	client  *nodeClient
 	server  *nodeServer
 }
 
 // NewNode creates a tcpNode with options
 func NewNode(opts ...gost.Option) gost.Node {
-	node := &tcpNode{
+	options := new(nodeOptions)
-		options: new(tcpNodeOptions),
-	}
 	for _, opt := range opts {
-		opt(node.options)
+		opt(options)
+	}
+	node := &tcpNode{
+		options: options,
+		client:  &nodeClient{options: options},
+		server: &nodeServer{options: options},
 	}
 
 	return node

tcp/options.go

@@ -6,21 +6,55 @@ import (
 	"github.com/ginuerzh/gost"
 )
 
-type tcpNodeOptions struct {
+type nodeOptions struct {
-	*gost.DefaultOptions
+	base         *gost.BaseOptions
-	Users []url.Userinfo `opt:"users"` // authentication for proxy
+	users        []url.Userinfo `opt:"users"` // authentication for proxy
+	certFile     string         `opt:"cert"`
+	keyFile      string         `opt:"key"`
+	serverName   string         `opt:"server_name"`
+	secureVerify bool           `opt:"secure"`
 }
 
-func (o *tcpNodeOptions) Get(opt string) interface{} {
+func (o *nodeOptions) BaseOptions() *gost.BaseOptions {
-	return gost.GetOption(o, opt)
+	return o.base
 }
 
-func (o *tcpNodeOptions) Set(opt string, v interface{}) {
+func UsersOption(users ...url.Userinfo) gost.Option {
-	gost.SetOption(o, opt, v)
+	return func(opts gost.Options) {
+		if o, ok := opts.(*nodeOptions); ok {
+			o.users = users
+		}
+	}
 }
 
-func UsersOption(users ...url.Userinfo) gost.Option {
+func (o *nodeOptions) ServerNameOption(n string) gost.Option {
+	return func(opts gost.Options) {
+		if o, ok := opts.(*nodeOptions); ok {
+			o.serverName = n
+		}
+	}
+}
+
+func (o *nodeOptions) SecureVerifyOption(b bool) gost.Option {
+	return func(opts gost.Options) {
+		if o, ok := opts.(*nodeOptions); ok {
+			o.secureVerify = b
+		}
+	}
+}
+
+func (o *nodeOptions) CertFileOption(f string) gost.Option {
+	return func(opts gost.Options) {
+		if o, ok := opts.(*nodeOptions); ok {
+			o.certFile = f
+		}
+	}
+}
+
+func (o *nodeOptions) KeyFileOption(f string) gost.Option {
 	return func(opts gost.Options) {
-		gost.SetOption(opts, "users", users)
+		if o, ok := opts.(*nodeOptions); ok {
+			o.keyFile = f
+		}
 	}
 }

tcp/server.go

@@ -1,8 +1,137 @@
 package tcp
 
+import (
+	"bufio"
+	"net"
+	"net/http"
+	"net/url"
+	"weed-fs/go/glog"
+
+	"github.com/ginuerzh/gosocks4"
+	"github.com/ginuerzh/gosocks5"
+	"github.com/ginuerzh/gost"
+	"github.com/ginuerzh/gost/ssocks"
+)
+
 type nodeServer struct {
+	options *nodeOptions
+	chain   *gost.Chain
+}
+
+func (s *nodeServer) Chain() *gost.Chain {
+	return s.chain
+}
+
+func (s *nodeServer) SetChain(chain *gost.Chain) {
+	s.chain = chain
+}
+
+func (s *nodeServer) Options() gost.Options {
+	return s.options
 }
 
 func (s *nodeServer) Run() error {
-	return nil
+	ln, err := net.Listen("tcp", s.options.BaseOptions().Addr)
+	if err != nil {
+		return err
+	}
+	defer ln.Close()
+
+	for {
+		conn, err := ln.Accept()
+		if err != nil {
+			return err
+		}
+		go s.handleConn(conn)
+	}
+}
+
+func (s *nodeServer) handleConn(conn net.Conn) {
+	defer conn.Close()
+
+	switch s.options.BaseOptions().Protocol {
+	case "ss": // shadowsocks
+		var cipher url.Userinfo
+		if len(s.options.users) > 0 {
+			cipher = s.options.users[0]
+		}
+		server := ssocks.NewServer(conn, &cipher, s)
+		server.Serve()
+		return
+	case "http":
+		req, err := http.ReadRequest(bufio.NewReader(conn))
+		if err != nil {
+			glog.V(LWARNING).Infoln("[http]", err)
+			return
+		}
+		NewHttpServer(conn, s).HandleRequest(req)
+		return
+	case "socks", "socks5":
+		conn = gosocks5.ServerConn(conn, s.selector)
+		req, err := gosocks5.ReadRequest(conn)
+		if err != nil {
+			glog.V(LWARNING).Infoln("[socks5]", err)
+			return
+		}
+		NewSocks5Server(conn, s).HandleRequest(req)
+		return
+	case "socks4", "socks4a":
+		req, err := gosocks4.ReadRequest(conn)
+		if err != nil {
+			glog.V(LWARNING).Infoln("[socks4]", err)
+			return
+		}
+		NewSocks4Server(conn, s).HandleRequest(req)
+		return
+	}
+
+	br := bufio.NewReader(conn)
+	b, err := br.Peek(1)
+	if err != nil {
+		glog.V(LWARNING).Infoln(err)
+		return
+	}
+
+	switch b[0] {
+	case gosocks4.Ver4:
+		req, err := gosocks4.ReadRequest(br)
+		if err != nil {
+			glog.V(LWARNING).Infoln("[socks4]", err)
+			return
+		}
+		NewSocks4Server(conn, s).HandleRequest(req)
+
+	case gosocks5.Ver5:
+		methods, err := gosocks5.ReadMethods(br)
+		if err != nil {
+			glog.V(LWARNING).Infoln("[socks5]", err)
+			return
+		}
+		method := s.selector.Select(methods...)
+		if _, err := conn.Write([]byte{gosocks5.Ver5, method}); err != nil {
+			glog.V(LWARNING).Infoln("[socks5] select:", err)
+			return
+		}
+		c, err := s.selector.OnSelected(method, conn)
+		if err != nil {
+			glog.V(LWARNING).Infoln("[socks5] onselected:", err)
+			return
+		}
+		conn = c
+
+		req, err := gosocks5.ReadRequest(conn)
+		if err != nil {
+			glog.V(LWARNING).Infoln("[socks5] request:", err)
+			return
+		}
+		NewSocks5Server(conn, s).HandleRequest(req)
+
+	default: // http
+		req, err := http.ReadRequest(br)
+		if err != nil {
+			glog.V(LWARNING).Infoln("[http]", err)
+			return
+		}
+		NewHttpServer(conn, s).HandleRequest(req)
+	}
 }