forked from ginuerzh/gost
/
conn.go
360 lines (324 loc) · 6.72 KB
/
conn.go
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package main
import (
"bufio"
"crypto/tls"
"encoding/base64"
"errors"
"github.com/ginuerzh/gosocks5"
"github.com/golang/glog"
"io"
"net"
"net/http"
"net/http/httputil"
"net/url"
"strconv"
"strings"
"sync/atomic"
)
var (
connCounter int32
)
func listenAndServe(arg Args) error {
var ln net.Listener
var err error
switch arg.Transport {
case "ws": // websocket connection
err = NewWs(arg).ListenAndServe()
if err != nil && glog.V(LFATAL) {
glog.Errorln(err)
}
return err
case "tls": // tls connection
ln, err = tls.Listen("tcp", arg.Addr,
&tls.Config{Certificates: []tls.Certificate{arg.Cert}})
case "tcp":
fallthrough
default:
ln, err = net.Listen("tcp", arg.Addr)
}
if err != nil {
if glog.V(LFATAL) {
glog.Errorln(err)
}
return err
}
defer ln.Close()
for {
conn, err := ln.Accept()
if err != nil {
if glog.V(LWARNING) {
glog.Warningln(err)
}
continue
}
go handleConn(conn, arg)
}
return nil
}
func handleConn(conn net.Conn, arg Args) {
atomic.AddInt32(&connCounter, 1)
if glog.V(LINFO) {
glog.Infof("%s connected, connections: %d",
conn.RemoteAddr(), atomic.LoadInt32(&connCounter))
}
if glog.V(LINFO) {
defer func() {
glog.Infof("%s disconnected, connections: %d",
conn.RemoteAddr(), atomic.LoadInt32(&connCounter))
}()
}
defer atomic.AddInt32(&connCounter, -1)
defer conn.Close()
selector := &serverSelector{
methods: []uint8{
gosocks5.MethodNoAuth,
gosocks5.MethodUserPass,
MethodTLS,
MethodTLSAuth,
},
arg: arg,
}
switch arg.Protocol {
case "ss": // shadowsocks
return
case "http":
req, err := http.ReadRequest(bufio.NewReader(conn))
if err != nil {
if glog.V(LWARNING) {
glog.Warningln("http:", err)
}
return
}
handleHttpRequest(req, conn, arg)
return
case "socks", "socks5":
conn = gosocks5.ServerConn(conn, selector)
req, err := gosocks5.ReadRequest(conn)
if err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5:", err)
}
return
}
handleSocks5Request(req, conn, arg)
return
}
// http + socks5
b := make([]byte, 16*1024)
n, err := io.ReadAtLeast(conn, b, 2)
if err != nil {
if glog.V(LWARNING) {
glog.Warningln("client:", err)
}
return
}
if b[0] == gosocks5.Ver5 {
mn := int(b[1]) // methods count
length := 2 + mn
if n < length {
if _, err := io.ReadFull(conn, b[n:length]); err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5:", err)
}
return
}
}
methods := b[2 : 2+mn]
method := selector.Select(methods...)
if _, err := conn.Write([]byte{gosocks5.Ver5, method}); err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5:", err)
}
return
}
c, err := selector.OnSelected(method, conn)
if err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5:", err)
}
return
}
conn = c
req, err := gosocks5.ReadRequest(conn)
if err != nil {
if glog.V(LWARNING) {
glog.Warningln("socks5:", err)
}
return
}
handleSocks5Request(req, conn, arg)
return
}
req, err := http.ReadRequest(bufio.NewReader(newReqReader(b[:n], conn)))
if err != nil {
if glog.V(LWARNING) {
glog.Warningln("http:", err)
}
return
}
handleHttpRequest(req, conn, arg)
}
type reqReader struct {
b []byte
r io.Reader
}
func newReqReader(b []byte, r io.Reader) *reqReader {
return &reqReader{
b: b,
r: r,
}
}
func (r *reqReader) Read(p []byte) (n int, err error) {
if len(r.b) == 0 {
return r.r.Read(p)
}
n = copy(p, r.b)
r.b = r.b[n:]
return
}
func connect(addr string) (conn net.Conn, err error) {
if !strings.Contains(addr, ":") {
addr += ":80"
}
if len(forwardArgs) == 0 {
return net.Dial("tcp", addr)
}
return forwardChain(addr, forwardArgs[0], forwardArgs[1:]...)
}
func forwardChain(addr string, level1 Args, chain ...Args) (conn net.Conn, err error) {
if glog.V(LINFO) {
glog.Infof("forward: %s/%s %s", level1.Protocol, level1.Transport, level1.Addr)
}
if conn, err = net.Dial("tcp", level1.Addr); err != nil {
return
}
c, err := forward(conn, level1)
if err != nil {
conn.Close()
return nil, err
}
conn = c
if len(chain) == 0 {
if err := establish(conn, addr, level1); err != nil {
conn.Close()
return nil, err
}
return
}
cur := level1
for _, arg := range chain {
if err = establish(conn, arg.Addr, cur); err != nil {
goto exit
}
c, err = forward(conn, arg)
if err != nil {
goto exit
}
conn = c
cur = arg
}
exit:
if err != nil {
conn.Close()
return nil, err
}
if err := establish(conn, addr, cur); err != nil {
conn.Close()
return nil, err
}
return
}
func forward(conn net.Conn, arg Args) (net.Conn, error) {
var err error
switch arg.Transport {
case "ws": // websocket connection
conn, err = wsClient(conn, arg.Addr)
if err != nil {
return nil, err
}
case "tls": // tls connection
conn = tls.Client(conn, &tls.Config{InsecureSkipVerify: true})
case "tcp":
fallthrough
default:
}
switch arg.Protocol {
case "ss": // shadowsocks
return nil, errors.New("Not implemented")
case "socks", "socks5":
selector := &clientSelector{
methods: []uint8{
gosocks5.MethodNoAuth,
gosocks5.MethodUserPass,
MethodTLS,
},
arg: arg,
}
c := gosocks5.ClientConn(conn, selector)
if err := c.Handleshake(); err != nil {
return nil, err
}
conn = c
case "http":
fallthrough
default:
}
return conn, nil
}
func establish(conn net.Conn, addr string, arg Args) error {
switch arg.Protocol {
case "ss": // shadowsocks
return nil
case "socks", "socks5":
host, port, err := net.SplitHostPort(addr)
p, _ := strconv.Atoi(port)
// TODO: support bind and udp
req := gosocks5.NewRequest(gosocks5.CmdConnect, &gosocks5.Addr{
Type: gosocks5.AddrDomain,
Host: host,
Port: uint16(p),
})
rep, err := requestSocks5(conn, req)
if err != nil {
return err
}
if rep.Rep != gosocks5.Succeeded {
return errors.New("Service unavailable")
}
case "http":
fallthrough
default:
req := &http.Request{
Method: "CONNECT",
URL: &url.URL{Host: addr},
Host: addr,
ProtoMajor: 1,
ProtoMinor: 1,
Header: make(http.Header),
}
req.Header.Set("Proxy-Connection", "keep-alive")
if arg.User != nil {
req.Header.Set("Proxy-Authorization",
"Basic "+base64.StdEncoding.EncodeToString([]byte(arg.User.String())))
}
if err := req.Write(conn); err != nil {
return err
}
if glog.V(LDEBUG) {
dump, _ := httputil.DumpRequest(req, false)
glog.Infoln(string(dump))
}
resp, err := http.ReadResponse(bufio.NewReader(conn), req)
if err != nil {
return err
}
if glog.V(LDEBUG) {
dump, _ := httputil.DumpResponse(resp, false)
glog.Infoln(string(dump))
}
if resp.StatusCode != http.StatusOK {
return errors.New(resp.Status)
}
}
return nil
}