tunnel over http

client.go

@@ -111,7 +111,7 @@ func cliHandle(conn net.Conn) {
 	}
 	defer c.Close()
 
-	if Websocket {
+	if UseWebsocket {
 		url := &url.URL{
 			Host: Saddr,
 		}
@@ -123,6 +123,14 @@ func cliHandle(conn net.Conn) {
 		resp.Body.Close()
 
 		c = NewWSConn(ws)
+	} else if UseHttp {
+		httpcli := NewHttpClientConn(c)
+		if err := httpcli.Handshake(); err != nil {
+			log.Println(err)
+			return
+		}
+		c = httpcli
+		defer httpcli.Close()
 	}
 
 	sc := gosocks5.ClientConn(c, clientConfig)

http.go

@@ -0,0 +1,230 @@
+package main
+
+import (
+	"bufio"
+	"bytes"
+	"code.google.com/p/go-uuid/uuid"
+	"github.com/ginuerzh/gosocks5"
+	"io"
+	"io/ioutil"
+	"log"
+	"net"
+	"net/http"
+	"net/url"
+	"time"
+)
+
+const (
+	s2cUri = "/s2c"
+	c2sUri = "/c2s"
+)
+
+type HttpClientConn struct {
+	c   net.Conn
+	url *url.URL
+	r   io.ReadCloser
+}
+
+func NewHttpClientConn(conn net.Conn) *HttpClientConn {
+	return &HttpClientConn{
+		c: conn,
+	}
+}
+
+func (conn *HttpClientConn) Handshake() error {
+	log.Println("remote", conn.c.RemoteAddr().String())
+	req := &http.Request{
+		Method: "Get",
+		Host:   conn.c.RemoteAddr().String(),
+		URL: &url.URL{
+			Host:   "ignored",
+			Scheme: "http",
+			Path:   s2cUri,
+		},
+	}
+	if err := req.Write(conn.c); err != nil {
+		return err
+	}
+
+	resp, err := http.ReadResponse(bufio.NewReader(conn.c), req)
+	if err != nil {
+		return err
+	}
+
+	b := make([]byte, 36)
+	if _, err = io.ReadFull(resp.Body, b); err != nil {
+		return err
+	}
+	log.Println("token", string(b))
+	q := url.Values{}
+	q.Set("token", string(b))
+	conn.url = &url.URL{
+		Scheme:   "http",
+		Host:     conn.c.RemoteAddr().String(),
+		Path:     c2sUri,
+		RawQuery: q.Encode(),
+	}
+	conn.r = resp.Body
+
+	return nil
+}
+
+func (conn *HttpClientConn) Read(b []byte) (n int, err error) {
+	return conn.r.Read(b)
+}
+
+func (conn *HttpClientConn) Write(b []byte) (n int, err error) {
+	c, err := Connect(Saddr, Proxy)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	request, err := http.NewRequest("POST", conn.url.String(), bytes.NewReader(b))
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	err = request.Write(c)
+	if err != nil {
+		log.Println(err)
+		return
+	}
+
+	return len(b), nil
+}
+
+func (conn *HttpClientConn) Close() error {
+	return conn.r.Close()
+}
+
+func (conn *HttpClientConn) LocalAddr() net.Addr {
+	return conn.c.LocalAddr()
+}
+
+func (conn *HttpClientConn) RemoteAddr() net.Addr {
+	return conn.c.RemoteAddr()
+}
+
+func (conn *HttpClientConn) SetDeadline(t time.Time) error {
+	return conn.c.SetDeadline(t)
+}
+
+func (conn *HttpClientConn) SetReadDeadline(t time.Time) error {
+	return conn.c.SetReadDeadline(t)
+}
+
+func (conn *HttpClientConn) SetWriteDeadline(t time.Time) error {
+	return conn.c.SetWriteDeadline(t)
+}
+
+type HttpServerConn struct {
+	w  http.ResponseWriter
+	c  chan []byte
+	rb []byte
+}
+
+func NewHttpServerConn(w http.ResponseWriter, c chan []byte) *HttpServerConn {
+	return &HttpServerConn{
+		w: w,
+		c: c,
+	}
+}
+
+func (conn *HttpServerConn) Read(b []byte) (n int, err error) {
+	if len(conn.rb) == 0 {
+		var ok bool
+		if conn.rb, ok = <-conn.c; !ok {
+			return 0, io.EOF
+		}
+	}
+	n = copy(b, conn.rb)
+	conn.rb = conn.rb[n:]
+
+	//log.Println("ws r:", n)
+
+	return
+}
+
+func (conn *HttpServerConn) Write(b []byte) (n int, err error) {
+	n, err = conn.w.Write(b)
+	if f, ok := conn.w.(http.Flusher); ok {
+		f.Flush()
+	}
+	return
+}
+
+func (conn *HttpServerConn) Close() error {
+	return nil
+}
+
+func (conn *HttpServerConn) LocalAddr() net.Addr {
+	return nil
+}
+
+func (conn *HttpServerConn) RemoteAddr() net.Addr {
+	return nil
+}
+
+func (conn *HttpServerConn) SetDeadline(t time.Time) error {
+	return nil
+}
+
+func (conn *HttpServerConn) SetReadDeadline(t time.Time) error {
+	return nil
+}
+
+func (conn *HttpServerConn) SetWriteDeadline(t time.Time) error {
+	return nil
+}
+
+type HttpServer struct {
+	Addr  string
+	chans map[string]chan []byte
+}
+
+func (s *HttpServer) s2c(w http.ResponseWriter, r *http.Request) {
+	token := uuid.New()
+	ch := make(chan []byte, 1)
+
+	conn := NewHttpServerConn(w, ch)
+	if _, err := conn.Write([]byte(token)); err != nil {
+		return
+	}
+
+	s.chans[token] = ch
+	defer delete(s.chans, token)
+
+	c := gosocks5.ServerConn(conn, serverConfig)
+	socks5Handle(c)
+}
+
+func (s *HttpServer) c2s(w http.ResponseWriter, r *http.Request) {
+	if r.Method != "POST" {
+		w.WriteHeader(http.StatusMethodNotAllowed)
+		return
+	}
+
+	token := r.FormValue("token")
+	ch := s.chans[token]
+	if ch == nil {
+		w.WriteHeader(http.StatusBadRequest)
+		return
+	}
+
+	b, err := ioutil.ReadAll(r.Body)
+	if err != nil || len(b) == 0 {
+		close(ch)
+		delete(s.chans, token)
+		return
+	}
+	ch <- b
+}
+
+func (s *HttpServer) ListenAndServe() error {
+	s.chans = make(map[string]chan []byte)
+	http.HandleFunc(s2cUri, s.s2c)
+	http.HandleFunc(c2sUri, s.c2s)
+	return http.ListenAndServe(s.Addr, nil)
+}

main.go

@@ -9,13 +9,13 @@ import (
 )
 
 var (
-	Laddr, Saddr, Proxy string
-	Websocket           bool
-	Shadows             bool
-	SMethod, SPassword  string
-	Method, Password    string
-	CertFile, KeyFile   string
-	PrintVersion        bool
+	Laddr, Saddr, Proxy   string
+	UseWebsocket, UseHttp bool
+	Shadows               bool
+	SMethod, SPassword    string
+	Method, Password      string
+	CertFile, KeyFile     string
+	PrintVersion          bool
 )
 
 func init() {
@@ -27,7 +27,8 @@ func init() {
 	flag.StringVar(&CertFile, "cert", "", "cert file for tls")
 	flag.StringVar(&KeyFile, "key", "", "key file for tls")
 	flag.BoolVar(&Shadows, "ss", false, "run as shadowsocks server")
-	flag.BoolVar(&Websocket, "ws", false, "use websocket for tunnel")
+	flag.BoolVar(&UseWebsocket, "ws", false, "use websocket for tunnel")
+	flag.BoolVar(&UseHttp, "http", false, "use http for tunnel")
 	flag.StringVar(&SMethod, "sm", "rc4-md5", "shadowsocks cipher method")
 	flag.StringVar(&SPassword, "sp", "ginuerzh@gmail.com", "shadowsocks cipher password")
 	flag.BoolVar(&PrintVersion, "v", false, "print version")
@@ -50,8 +51,10 @@ func main() {
 
 	if len(Saddr) == 0 {
 		var server Server
-		if Websocket {
+		if UseWebsocket {
 			server = &WSServer{Addr: Laddr}
+		} else if UseHttp {
+			server = &HttpServer{Addr: Laddr}
 		} else {
 			server = &Socks5Server{Addr: Laddr}
 		}

version.go

@@ -5,7 +5,7 @@ import (
 )
 
 const (
-	Version = "1.3"
+	Version = "1.4"
 )
 
 func printVersion() {