+/*
+GoVPN -- simple secure free software virtual private network daemon
+Copyright (C) 2014-2015 Sergey Matveev <stargrave@stargrave.org>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+package main
+
+import (
+ "bufio"
+ "encoding/base64"
+ "io"
+ "log"
+ "net"
+ "net/http"
+)
+
+func proxyTCP() (io.Writer, chan []byte, chan struct{}) {
+ proxyAddr, err := net.ResolveTCPAddr("tcp", *proxyAddr)
+ if err != nil {
+ log.Fatalln("Can not resolve proxy address:", err)
+ }
+ conn, err := net.DialTCP("tcp", nil, proxyAddr)
+ if err != nil {
+ log.Fatalln("Can not connect to proxy:", err)
+ }
+ req := "CONNECT " + *remoteAddr + " HTTP/1.1\n"
+ req += "Host: " + *remoteAddr + "\n"
+ if *proxyAuth != "" {
+ req += "Proxy-Authorization: Basic "
+ req += base64.StdEncoding.EncodeToString([]byte(*proxyAuth)) + "\n"
+ }
+ req += "\n"
+ conn.Write([]byte(req))
+ resp, err := http.ReadResponse(
+ bufio.NewReader(conn),
+ &http.Request{Method: "CONNECT"},
+ )
+ if err != nil || resp.StatusCode != http.StatusOK {
+ log.Fatalln("Unexpected response from proxy")
+ }
+ sink := make(chan []byte)
+ ready := make(chan struct{})
+ go handleTCP(conn, sink, ready)
+ go func() { ready <- struct{}{} }()
+ return TCPSender{conn}, sink, ready
+}