554 lines
16 KiB
Go
554 lines
16 KiB
Go
package main
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import (
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//"bytes"
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"crypto/tls"
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"errors"
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"github.com/ginuerzh/gosocks5"
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"github.com/golang/glog"
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//"os/exec"
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//"io"
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//"io/ioutil"
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"net"
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"net/url"
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"strconv"
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"time"
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)
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const (
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MethodTLS uint8 = 0x80 // extended method for tls
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MethodTLSAuth uint8 = 0x82 // extended method for tls+auth
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)
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const (
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CmdUdpConnect uint8 = 0xF1 // extended method for udp local port forwarding
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CmdUdpTun uint8 = 0xF3 // extended method for udp over tcp
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)
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type clientSelector struct {
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methods []uint8
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user *url.Userinfo
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}
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func (selector *clientSelector) Methods() []uint8 {
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return selector.methods
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}
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func (selector *clientSelector) Select(methods ...uint8) (method uint8) {
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return
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}
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func (selector *clientSelector) OnSelected(method uint8, conn net.Conn) (net.Conn, error) {
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switch method {
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case MethodTLS:
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conn = tls.Client(conn, &tls.Config{InsecureSkipVerify: true})
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case gosocks5.MethodUserPass, MethodTLSAuth:
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if method == MethodTLSAuth {
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conn = tls.Client(conn, &tls.Config{InsecureSkipVerify: true})
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}
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var username, password string
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if selector.user != nil {
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username = selector.user.Username()
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password, _ = selector.user.Password()
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}
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req := gosocks5.NewUserPassRequest(gosocks5.UserPassVer, username, password)
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if err := req.Write(conn); err != nil {
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glog.V(LWARNING).Infoln("socks5 auth:", err)
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return nil, err
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}
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glog.V(LDEBUG).Infoln(req)
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resp, err := gosocks5.ReadUserPassResponse(conn)
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if err != nil {
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glog.V(LWARNING).Infoln("socks5 auth:", err)
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return nil, err
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}
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glog.V(LDEBUG).Infoln(resp)
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if resp.Status != gosocks5.Succeeded {
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return nil, gosocks5.ErrAuthFailure
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}
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case gosocks5.MethodNoAcceptable:
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return nil, gosocks5.ErrBadMethod
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}
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return conn, nil
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}
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type serverSelector struct {
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methods []uint8
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user *url.Userinfo
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cert tls.Certificate
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}
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func (selector *serverSelector) Methods() []uint8 {
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return selector.methods
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}
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func (selector *serverSelector) Select(methods ...uint8) (method uint8) {
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glog.V(LDEBUG).Infof("%d %d %v", gosocks5.Ver5, len(methods), methods)
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method = gosocks5.MethodNoAuth
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for _, m := range methods {
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if m == MethodTLS {
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method = m
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break
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}
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}
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// when user/pass is set, auth is mandatory
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if selector.user != nil {
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if method == gosocks5.MethodNoAuth {
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method = gosocks5.MethodUserPass
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}
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if method == MethodTLS {
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method = MethodTLSAuth
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}
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}
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return
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}
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func (selector *serverSelector) OnSelected(method uint8, conn net.Conn) (net.Conn, error) {
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glog.V(LDEBUG).Infof("%d %d", gosocks5.Ver5, method)
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switch method {
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case MethodTLS:
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conn = tls.Server(conn, &tls.Config{Certificates: []tls.Certificate{selector.cert}})
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case gosocks5.MethodUserPass, MethodTLSAuth:
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if method == MethodTLSAuth {
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conn = tls.Server(conn, &tls.Config{Certificates: []tls.Certificate{selector.cert}})
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}
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req, err := gosocks5.ReadUserPassRequest(conn)
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if err != nil {
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glog.V(LWARNING).Infoln("[socks5-auth]", err)
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return nil, err
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}
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glog.V(LDEBUG).Infoln("[socks5]", req.String())
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var username, password string
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if selector.user != nil {
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username = selector.user.Username()
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password, _ = selector.user.Password()
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}
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if (username != "" && req.Username != username) || (password != "" && req.Password != password) {
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resp := gosocks5.NewUserPassResponse(gosocks5.UserPassVer, gosocks5.Failure)
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if err := resp.Write(conn); err != nil {
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glog.V(LWARNING).Infoln("[socks5-auth]", err)
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return nil, err
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}
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glog.V(LDEBUG).Infoln("[socks5]", resp)
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glog.V(LWARNING).Infoln("[socks5-auth] proxy authentication required")
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return nil, gosocks5.ErrAuthFailure
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}
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resp := gosocks5.NewUserPassResponse(gosocks5.UserPassVer, gosocks5.Succeeded)
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if err := resp.Write(conn); err != nil {
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glog.V(LWARNING).Infoln("[socks5-auth]", err)
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return nil, err
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}
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glog.V(LDEBUG).Infoln(resp)
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case gosocks5.MethodNoAcceptable:
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return nil, gosocks5.ErrBadMethod
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}
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return conn, nil
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}
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func handleSocks5Request(req *gosocks5.Request, conn net.Conn) {
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glog.V(LDEBUG).Infof("[socks5] %s -> %s\n%s", conn.RemoteAddr(), req.Addr, req)
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switch req.Cmd {
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case gosocks5.CmdConnect:
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glog.V(LINFO).Infof("[socks5-connect] %s - %s", conn.RemoteAddr(), req.Addr)
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tconn, err := Connect(req.Addr.String())
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if err != nil {
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glog.V(LWARNING).Infof("[socks5-connect] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
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rep := gosocks5.NewReply(gosocks5.HostUnreachable, nil)
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if err := rep.Write(conn); err != nil {
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glog.V(LWARNING).Infof("[socks5-connect] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)
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} else {
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glog.V(LDEBUG).Infof("[socks5-connect] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)
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}
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return
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}
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defer tconn.Close()
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rep := gosocks5.NewReply(gosocks5.Succeeded, nil)
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if err := rep.Write(conn); err != nil {
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glog.V(LWARNING).Infof("[socks5-connect] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)
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return
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}
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glog.V(LDEBUG).Infof("[socks5-connect] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)
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glog.V(LINFO).Infof("[socks5-connect] %s <-> %s", conn.RemoteAddr(), req.Addr)
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Transport(conn, tconn)
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glog.V(LINFO).Infof("[socks5-connect] %s >-< %s", conn.RemoteAddr(), req.Addr)
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case gosocks5.CmdBind:
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glog.V(LINFO).Infof("[socks5-bind] %s - %s", conn.RemoteAddr(), req.Addr)
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reply, fconn, err := socks5Bind(req, conn)
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if reply != nil {
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if err := reply.Write(conn); err != nil {
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glog.V(LWARNING).Infof("[socks5-bind] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)
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if fconn != nil {
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fconn.Close()
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}
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return
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}
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glog.V(LDEBUG).Infof("[socks5-bind] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, reply)
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}
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if err != nil {
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glog.V(LWARNING).Infof("[socks5-bind] %s - %s : %s", conn.RemoteAddr(), req.Addr, err)
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return
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}
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defer fconn.Close()
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glog.V(LINFO).Infof("[socks5-bind] %s <-> %s", conn.RemoteAddr(), fconn.RemoteAddr())
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Transport(conn, fconn)
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glog.V(LINFO).Infof("[socks5-bind] %s >-< %s", conn.RemoteAddr(), fconn.RemoteAddr())
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case CmdUdpConnect:
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glog.V(LINFO).Infof("[udp-connect] %s - %s", conn.RemoteAddr(), req.Addr)
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udpConnect(req, conn)
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case gosocks5.CmdUdp:
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glog.V(LINFO).Infof("[socks5-udp] %s - %s", conn.RemoteAddr(), req.Addr)
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socks5UDP(req, conn)
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case CmdUdpTun:
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glog.V(LINFO).Infof("[socks5-udp] %s - %s", conn.RemoteAddr(), req.Addr)
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if err := socks5TunnelUDP(req, conn); err != nil {
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glog.V(LWARNING).Infof("[socks5-udp] %s - %s : %s", conn.RemoteAddr(), req.Addr, err)
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rep := gosocks5.NewReply(gosocks5.Failure, nil)
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if err := rep.Write(conn); err != nil {
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glog.V(LWARNING).Infof("[socks5-udp] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)
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} else {
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glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)
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}
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return
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}
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default:
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glog.V(LWARNING).Infoln("[socks5] Unrecognized request:", req.Cmd)
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}
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}
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func udpConnect(req *gosocks5.Request, conn net.Conn) error {
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if len(forwardArgs) > 0 { // direct forwarding
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fconn, _, err := forwardChain(forwardArgs...)
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if err != nil {
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glog.V(LINFO).Infof("[udp-connect] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
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gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
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return err
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}
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defer fconn.Close()
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if err := req.Write(fconn); err != nil {
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glog.V(LINFO).Infof("[udp-connect] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
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gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
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return err
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}
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glog.V(LINFO).Infof("[udp-connect] %s <-> %s", conn.RemoteAddr(), req.Addr)
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err = Transport(conn, fconn)
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glog.V(LINFO).Infof("[udp-connect] %s >-< %s", conn.RemoteAddr(), req.Addr)
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return err
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}
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raddr, err := net.ResolveUDPAddr("udp", req.Addr.String())
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if err != nil {
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glog.V(LINFO).Infof("[udp-connect] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
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gosocks5.NewReply(gosocks5.Failure, nil).Write(conn)
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return err
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}
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if err := gosocks5.NewReply(gosocks5.Succeeded, nil).Write(conn); err != nil {
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glog.V(LINFO).Infof("[udp-connect] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)
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return err
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}
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glog.V(LINFO).Infof("[udp-connect] %s <-> %s", conn.RemoteAddr(), raddr)
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defer glog.V(LINFO).Infof("[udp-connect] %s >-< %s", conn.RemoteAddr(), raddr)
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for {
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dgram, err := gosocks5.ReadUDPDatagram(conn)
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if err != nil {
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glog.V(LWARNING).Infof("[udp-connect] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
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return err
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}
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go func() {
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b := udpPool.Get().([]byte)
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defer udpPool.Put(b)
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relay, err := net.DialUDP("udp", nil, raddr)
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if err != nil {
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glog.V(LWARNING).Infof("[udp-connect] %s -> %s : %s", conn.RemoteAddr(), raddr, err)
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return
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}
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defer relay.Close()
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if _, err := relay.Write(dgram.Data); err != nil {
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glog.V(LWARNING).Infof("[udp-connect] %s -> %s : %s", conn.RemoteAddr(), raddr, err)
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return
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}
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glog.V(LDEBUG).Infof("[udp-connect] %s >>> %s length: %d", conn.RemoteAddr(), raddr, len(dgram.Data))
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relay.SetReadDeadline(time.Now().Add(time.Second * 60))
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n, err := relay.Read(b)
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if err != nil {
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glog.V(LWARNING).Infof("[udp-connect] %s <- %s : %s", conn.RemoteAddr(), raddr, err)
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return
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}
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relay.SetReadDeadline(time.Time{})
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glog.V(LDEBUG).Infof("[udp-connect] %s <<< %s length: %d", conn.RemoteAddr(), raddr, n)
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conn.SetWriteDeadline(time.Now().Add(time.Second * 90))
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if err := gosocks5.NewUDPDatagram(gosocks5.NewUDPHeader(uint16(n), 0, dgram.Header.Addr), b[:n]).Write(conn); err != nil {
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glog.V(LWARNING).Infof("[udp-connect] %s <- %s : %s", conn.RemoteAddr(), raddr, err)
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return
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}
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conn.SetWriteDeadline(time.Time{})
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}()
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}
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}
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func socks5UDP(req *gosocks5.Request, conn net.Conn) error {
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bindAddr, _ := net.ResolveUDPAddr("udp", req.Addr.String())
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relay, err := net.ListenUDP("udp", bindAddr) // udp associate, strict mode: if the port already in use, it will return error
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if err != nil {
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glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
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rep := gosocks5.NewReply(gosocks5.Failure, nil)
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if err := rep.Write(conn); err != nil {
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glog.V(LWARNING).Infof("[socks5-udp] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)
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} else {
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glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)
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}
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return err
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}
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defer relay.Close()
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addr := ToSocksAddr(relay.LocalAddr())
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addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
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rep := gosocks5.NewReply(gosocks5.Succeeded, addr)
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if err := rep.Write(conn); err != nil {
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return err
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}
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glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)
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glog.V(LINFO).Infof("[socks5-udp] %s - %s BIND ON %s OK", conn.RemoteAddr(), req.Addr, addr)
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if len(forwardArgs) > 0 { // client -> tunnel, tunnel udp over tcp
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tun, _, err := forwardChain(forwardArgs...)
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if err != nil {
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glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
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return err
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}
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defer tun.Close()
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tun.SetWriteDeadline(time.Now().Add(time.Second * 90))
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if err := gosocks5.NewRequest(CmdUdpTun, nil).Write(tun); err != nil {
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glog.V(LWARNING).Infoln("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
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return err
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}
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tun.SetWriteDeadline(time.Time{})
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tun.SetReadDeadline(time.Now().Add(time.Second * 90))
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rep, err := gosocks5.ReadReply(tun)
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if err != nil {
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glog.V(LWARNING).Infoln("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
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return err
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}
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if rep.Rep != gosocks5.Succeeded {
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return errors.New("udp associate error")
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}
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tun.SetReadDeadline(time.Time{})
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glog.V(LINFO).Infof("[socks5-udp] %s <-> %s", conn.RemoteAddr(), req.Addr)
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go tunnelUDP(relay, tun, true)
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} else { // standard socks5 udp relay
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peer, err := net.ListenUDP("udp", nil)
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if err != nil {
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glog.V(LWARNING).Infof("[socks5-udp] %s -> %s : %s", conn.RemoteAddr(), req.Addr, err)
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return err
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}
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defer peer.Close()
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glog.V(LINFO).Infof("[socks5-udp] %s <-> %s", conn.RemoteAddr(), req.Addr)
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go transportUDP(relay, peer)
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}
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b := tcpPool.Get().([]byte)
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defer tcpPool.Put(b)
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for {
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_, err := conn.Read(b) // discard any data from tcp connection
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if err != nil {
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break // client disconnected
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}
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}
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glog.V(LINFO).Infof("[socks5-udp] %s >-< %s", conn.RemoteAddr(), req.Addr)
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return nil
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}
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func socks5TunnelUDP(req *gosocks5.Request, conn net.Conn) error {
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if len(forwardArgs) > 0 { // tunnel -> tunnel, direct forwarding
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tun, _, err := forwardChain(forwardArgs...)
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if err != nil {
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return err
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}
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defer tun.Close()
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if err := req.Write(tun); err != nil {
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return err
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}
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glog.V(LINFO).Infof("[socks5-udp] %s <-> %s[tun]", conn.RemoteAddr(), tun.RemoteAddr())
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Transport(conn, tun)
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glog.V(LINFO).Infof("[socks5-udp] %s >-< %s[tun]", conn.RemoteAddr(), tun.RemoteAddr())
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} else { // tunnel -> remote, handle tunnel udp request
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bindAddr, _ := net.ResolveUDPAddr("udp", req.Addr.String())
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uconn, err := net.ListenUDP("udp", bindAddr)
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if err != nil {
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return err
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}
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defer uconn.Close()
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addr := ToSocksAddr(uconn.LocalAddr())
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addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
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rep := gosocks5.NewReply(gosocks5.Succeeded, addr)
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if err := rep.Write(conn); err != nil {
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return nil
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}
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glog.V(LDEBUG).Infof("[socks5-udp] %s <- %s\n%s", conn.RemoteAddr(), uconn.LocalAddr(), rep)
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glog.V(LINFO).Infof("[socks5-udp] %s <-> %s", conn.RemoteAddr(), uconn.LocalAddr())
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tunnelUDP(uconn, conn, false)
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glog.V(LINFO).Infof("[socks5-udp] %s >-< %s", conn.RemoteAddr(), uconn.LocalAddr())
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}
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return nil
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}
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func socks5Bind(req *gosocks5.Request, conn net.Conn) (*gosocks5.Reply, net.Conn, error) {
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if len(forwardArgs) > 0 {
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|
fconn, _, err := forwardChain(forwardArgs...)
|
|
if err != nil {
|
|
return gosocks5.NewReply(gosocks5.Failure, nil), nil, err
|
|
}
|
|
|
|
if err := req.Write(fconn); err != nil {
|
|
fconn.Close()
|
|
return gosocks5.NewReply(gosocks5.Failure, nil), nil, err
|
|
}
|
|
|
|
return nil, fconn, nil
|
|
}
|
|
|
|
bindAddr, _ := net.ResolveTCPAddr("tcp", req.Addr.String())
|
|
ln, err := net.ListenTCP("tcp", bindAddr) // strict mode: if the port already in use, it will return error
|
|
if err != nil {
|
|
return gosocks5.NewReply(gosocks5.Failure, nil), nil, err
|
|
}
|
|
|
|
addr := ToSocksAddr(ln.Addr())
|
|
// Issue: may not reachable when host has multi-interface
|
|
addr.Host, _, _ = net.SplitHostPort(conn.LocalAddr().String())
|
|
rep := gosocks5.NewReply(gosocks5.Succeeded, addr)
|
|
if err := rep.Write(conn); err != nil {
|
|
glog.V(LWARNING).Infof("[socks5-bind] %s <- %s : %s", conn.RemoteAddr(), req.Addr, err)
|
|
ln.Close()
|
|
return nil, nil, err
|
|
}
|
|
glog.V(LDEBUG).Infof("[socks5-bind] %s <- %s\n%s", conn.RemoteAddr(), req.Addr, rep)
|
|
glog.V(LINFO).Infof("[socks5-bind] %s - %s BIND ON %s OK", conn.RemoteAddr(), req.Addr, addr)
|
|
|
|
lnChan := make(chan net.Conn, 1)
|
|
go func() {
|
|
defer close(lnChan)
|
|
c, err := ln.AcceptTCP()
|
|
if err != nil {
|
|
return
|
|
}
|
|
lnChan <- c
|
|
}()
|
|
|
|
peerChan := make(chan error, 1)
|
|
go func() {
|
|
defer close(peerChan)
|
|
b := tcpPool.Get().([]byte)
|
|
defer tcpPool.Put(b)
|
|
_, err := conn.Read(b)
|
|
if err != nil {
|
|
if opErr, ok := err.(*net.OpError); ok && opErr.Timeout() {
|
|
return
|
|
}
|
|
peerChan <- err
|
|
}
|
|
}()
|
|
|
|
var pconn net.Conn
|
|
|
|
for {
|
|
select {
|
|
case c := <-lnChan:
|
|
ln.Close() // only accept one peer
|
|
if c == nil {
|
|
return gosocks5.NewReply(gosocks5.Failure, nil), nil, errors.New("[socks5-bind] accept error")
|
|
}
|
|
pconn = c
|
|
lnChan = nil
|
|
ln = nil
|
|
conn.SetReadDeadline(time.Now()) // timeout right now ,so we can break out of blocking
|
|
case err := <-peerChan:
|
|
if err != nil || pconn == nil {
|
|
if ln != nil {
|
|
ln.Close()
|
|
}
|
|
if pconn != nil {
|
|
pconn.Close()
|
|
}
|
|
if err == nil {
|
|
err = errors.New("Oops, some mysterious error!")
|
|
}
|
|
return nil, nil, err
|
|
}
|
|
goto out
|
|
}
|
|
}
|
|
|
|
out:
|
|
conn.SetReadDeadline(time.Time{})
|
|
|
|
glog.V(LINFO).Infof("[socks5-bind] %s <- %s PEER %s ACCEPTED", conn.RemoteAddr(), addr, pconn.RemoteAddr())
|
|
rep = gosocks5.NewReply(gosocks5.Succeeded, ToSocksAddr(pconn.RemoteAddr()))
|
|
return rep, pconn, nil
|
|
}
|
|
|
|
func ToSocksAddr(addr net.Addr) *gosocks5.Addr {
|
|
host := "0.0.0.0"
|
|
port := 0
|
|
if addr != nil {
|
|
h, p, _ := net.SplitHostPort(addr.String())
|
|
host = h
|
|
port, _ = strconv.Atoi(p)
|
|
}
|
|
return &gosocks5.Addr{
|
|
Type: gosocks5.AddrIPv4,
|
|
Host: host,
|
|
Port: uint16(port),
|
|
}
|
|
}
|