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prepared.go
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prepared.go
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// Copyright 2018 Google LLC
//
// 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.
//+build ignore
package main
import (
"bytes"
"crypto/tls"
"encoding/binary"
"io"
"log"
"net"
"os"
"time"
)
func main() {
l, err := net.Listen("tcp", "localhost:4242")
if err != nil {
log.Fatal(err)
}
for {
conn, err := l.Accept()
if err, ok := err.(net.Error); ok && err.Temporary() {
log.Printf("Temporary Accept error: %v; sleeping 1s...", err)
time.Sleep(1 * time.Second)
continue
} else if err != nil {
log.Fatal(err)
}
go serviceConn(conn)
}
}
func serviceConn(conn net.Conn) {
defer conn.Close()
conn.SetDeadline(time.Now().Add(30 * time.Second))
var buf bytes.Buffer
if _, err := io.CopyN(&buf, conn, 1+2+2); err != nil {
log.Println("Failed to read record header:", err)
conn.Close()
return
}
length := binary.BigEndian.Uint16(buf.Bytes()[3:5])
if _, err := io.CopyN(&buf, conn, int64(length)); err != nil {
log.Println("Failed to read Client Hello record:", err)
conn.Close()
return
}
ch, ok := ParseClientHello(buf.Bytes())
if !ok {
log.Println("Failed to parse Client Hello.")
} else {
log.Printf("Received connection for SNI %q!", ch.SNI)
}
conn.SetDeadline(time.Time{}) // reset deadline
conn.(*net.TCPConn).SetKeepAlive(true)
conn.(*net.TCPConn).SetKeepAlivePeriod(3 * time.Minute)
// TODO: move to main()
cert, err := tls.LoadX509KeyPair("localhost.pem", "localhost-key.pem")
if err != nil {
log.Fatal(err)
}
config := &tls.Config{Certificates: []tls.Certificate{cert}}
c := tls.Server(prefixConn{
Reader: io.MultiReader(&buf, conn),
Conn: conn,
}, config)
// copyToStderr(c)
proxyConn(c, "gophercon.com:http")
}
type prefixConn struct {
io.Reader
net.Conn
}
func (c prefixConn) Read(b []byte) (int, error) {
return c.Reader.Read(b)
}
func proxyConn(conn net.Conn, addr string) {
upstream, err := net.Dial("tcp", addr)
if err != nil {
log.Println(err)
return
}
defer upstream.Close()
go io.Copy(upstream, conn) // cancelled by Close
_, err = io.Copy(conn, upstream) // splice from 1.11!
log.Printf("Proxy connection finished with err = %v", err)
}
func copyToStderr(conn net.Conn) {
var total int
for {
conn.SetReadDeadline(time.Now().Add(5 * time.Second))
var buf [128]byte
n, err := conn.Read(buf[:])
os.Stderr.Write(buf[:n])
total += n
if err != nil {
log.Printf("Copied %d bytes and ended with err = %v.", total, err)
return // or we could recover if Timeout()
}
}
}