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main.go
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main.go
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// Copyright 2020 The Outline Authors
//
// 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 main
import (
"crypto/tls"
"flag"
"fmt"
"log"
"net"
"os"
"github.com/ernestzhang/outline-go-tun2socks/intra/split"
)
func main() {
flag.Usage = func() {
fmt.Fprintf(flag.CommandLine.Output(), "Usage: %s [-sni=SNI] destination\n", os.Args[0])
fmt.Fprintln(flag.CommandLine.Output(), "This tool attempts a TLS connection to the "+
"destination (port 443), with and without splitting. If the SNI is specified, it "+
"overrides the destination, which can be an IP address.")
flag.PrintDefaults()
}
sni := flag.String("sni", "", "Server name override")
flag.Parse()
destination := flag.Arg(0)
if destination == "" {
flag.Usage()
return
}
addr, err := net.ResolveTCPAddr("tcp", net.JoinHostPort(destination, "443"))
if err != nil {
log.Fatalf("Couldn't resolve destination: %v", err)
}
if *sni == "" {
*sni = destination
}
tlsConfig := &tls.Config{ServerName: *sni}
log.Println("Trying direct connection")
conn, err := net.DialTCP(addr.Network(), nil, addr)
if err != nil {
log.Fatalf("Could not establish a TCP connection: %v", err)
}
tlsConn := tls.Client(conn, tlsConfig)
err = tlsConn.Handshake()
if err != nil {
log.Printf("Direct TLS handshake failed: %v", err)
} else {
log.Printf("Direct TLS succeeded")
}
log.Println("Trying split connection")
splitConn, err := split.DialWithSplit(&net.Dialer{}, addr)
if err != nil {
log.Fatalf("Could not establish a splitting socket: %v", err)
}
tlsConn2 := tls.Client(splitConn, tlsConfig)
err = tlsConn2.Handshake()
if err != nil {
log.Printf("Split TLS handshake failed: %v", err)
} else {
log.Printf("Split TLS succeeded")
}
}