vendor: update

vendor/github.com/fatedier/golib/net/proxy.go

@@ -0,0 +1,106 @@
+// Copyright 2018 fatedier, fatedier@gmail.com
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package net
+
+import (
+	"bufio"
+	"encoding/base64"
+	"fmt"
+	"net"
+	"net/http"
+	"net/url"
+
+	"golang.org/x/net/proxy"
+)
+
+type ProxyAuth struct {
+	Enable   bool
+	Username string
+	Passwd   string
+}
+
+func DialTcpByProxy(proxyStr string, addr string) (c net.Conn, err error) {
+	if proxyStr == "" {
+		return net.Dial("tcp", addr)
+	}
+
+	var proxyUrl *url.URL
+	if proxyUrl, err = url.Parse(proxyStr); err != nil {
+		return
+	}
+
+	auth := &ProxyAuth{}
+	if proxyUrl.User != nil {
+		auth.Username = proxyUrl.User.Username()
+		auth.Passwd, _ = proxyUrl.User.Password()
+	}
+
+	switch proxyUrl.Scheme {
+	case "http":
+		return DialTcpByHttpProxy(proxyUrl.Host, addr, auth)
+	case "socks5":
+		return DialTcpBySocks5Proxy(proxyUrl.Host, addr, auth)
+	default:
+		err = fmt.Errorf("Proxy URL scheme must be http or socks5, not [%s]", proxyUrl.Scheme)
+		return
+	}
+}
+
+func DialTcpByHttpProxy(proxyHost string, dstAddr string, auth *ProxyAuth) (c net.Conn, err error) {
+	if c, err = net.Dial("tcp", proxyHost); err != nil {
+		return
+	}
+
+	req, err := http.NewRequest("CONNECT", "http://"+dstAddr, nil)
+	if err != nil {
+		return
+	}
+	if auth.Enable {
+		req.Header.Set("Proxy-Authorization", "Basic "+base64.StdEncoding.EncodeToString([]byte(auth.Username+":"+auth.Passwd)))
+	}
+	req.Header.Set("User-Agent", "Mozilla/5.0")
+	req.Write(c)
+
+	resp, err := http.ReadResponse(bufio.NewReader(c), req)
+	if err != nil {
+		return nil, err
+	}
+	resp.Body.Close()
+	if resp.StatusCode != 200 {
+		err = fmt.Errorf("DialTcpByHttpProxy error, StatusCode [%d]", resp.StatusCode)
+		return
+	}
+	return
+}
+
+func DialTcpBySocks5Proxy(proxyHost string, dstAddr string, auth *ProxyAuth) (c net.Conn, err error) {
+	var s5Auth *proxy.Auth
+	if auth.Enable {
+		s5Auth = &proxy.Auth{
+			User:     auth.Username,
+			Password: auth.Passwd,
+		}
+	}
+
+	dialer, err := proxy.SOCKS5("tcp", proxyHost, s5Auth, nil)
+	if err != nil {
+		return nil, err
+	}
+
+	if c, err = dialer.Dial("tcp", dstAddr); err != nil {
+		return
+	}
+	return
+}