增加connect host伪装

connector/http/connector.go

@@ -2,9 +2,12 @@ package http
 
 import (
 	"bufio"
+	"bytes"
 	"context"
 	"encoding/base64"
+	"encoding/binary"
 	"fmt"
+	"hash/crc32"
 	"net"
 	"net/http"
 	"net/http/httputil"
@@ -53,10 +56,16 @@ func (c *httpConnector) Connect(ctx context.Context, conn net.Conn, network, add
 	})
 	log.Debugf("connect %s/%s", address, network)
 
+	connectHost := address
+	if c.md.host != "" {
+		// 伪装的地址
+		connectHost = c.md.host
+	}
+
 	req := &http.Request{
 		Method:     http.MethodConnect,
-		URL:        &url.URL{Host: address},
-		Host:       address,
+		URL:        &url.URL{Host: connectHost},
+		Host:       connectHost,
 		ProtoMajor: 1,
 		ProtoMinor: 1,
 		Header:     c.md.header,
@@ -67,6 +76,12 @@ func (c *httpConnector) Connect(ctx context.Context, conn net.Conn, network, add
 	}
 	req.Header.Set("Proxy-Connection", "keep-alive")
 
+	// 真实连接的地址
+	if c.md.host != "" {
+		targetAddr := encodeServerName(address)
+		req.Header.Set("Gost-Target", targetAddr)
+	}
+
 	if user := c.options.Auth; user != nil {
 		u := user.Username()
 		p, _ := user.Password()
@@ -129,3 +144,10 @@ func (c *httpConnector) Connect(ctx context.Context, conn net.Conn, network, add
 
 	return conn, nil
 }
+
+func encodeServerName(name string) string {
+	buf := &bytes.Buffer{}
+	binary.Write(buf, binary.BigEndian, crc32.ChecksumIEEE([]byte(name)))
+	buf.WriteString(base64.RawURLEncoding.EncodeToString([]byte(name)))
+	return base64.RawURLEncoding.EncodeToString(buf.Bytes())
+}