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server.go
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server.go
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// Copyright 2016, Cong Ding. All rights reserved.
//
// 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.
//
// author: Cong Ding <dinggnu@gmail.com>
package main
import (
"bufio"
"crypto/tls"
"fmt"
"io"
"log"
"net"
"os"
"github.com/ccding/go-rproxy/certs"
)
const (
appName = "testapp"
rootCert = "certs/root_cert.pem"
serverCert = "certs/server_cert.pem"
serverKey = "certs/server_key.pem"
backendAddr = "127.0.0.1:23002" // backend addr of the rproxy
)
func main() {
config, err := certs.LoadServerCerts(rootCert, serverCert, serverKey)
if err != nil {
log.Fatalf("load server certs error: %v", err)
}
listener, err := tls.Listen("tcp", backendAddr, config)
if err != nil {
log.Fatalf("listen error: %v", err)
}
var stdin = make(chan string, 1024)
go readStdin(stdin)
for {
conn, err := listener.Accept()
if err != nil {
log.Fatalf("accept error: %v", err)
}
go handleConn(conn, stdin)
}
}
func readStdin(stdin chan string) {
scanner := bufio.NewScanner(os.Stdin)
for scanner.Scan() {
stdin <- scanner.Text() + "\n"
}
}
func handleConn(conn net.Conn, stdin chan string) {
defer conn.Close()
tlsConn, ok := conn.(*tls.Conn)
if !ok {
log.Fatalf("error: not tls conn")
return
}
if err := tlsConn.Handshake(); err != nil {
log.Fatalf("handshake error: %v", err)
return
}
var quit = make(chan bool, 2)
go read(conn, quit)
write(conn, quit, stdin)
}
func read(conn net.Conn, quit chan bool) {
buf := make([]byte, 1024)
for {
n, err := conn.Read(buf)
if err != nil {
if err != io.EOF {
log.Fatalf("read error: %v", err)
}
quit <- true
return
}
fmt.Print(string(buf[:n]))
}
}
func write(conn net.Conn, quit chan bool, stdin chan string) {
for {
select {
case <-quit:
return
case message := <-stdin:
_, err := conn.Write([]byte(message))
if err != nil {
quit <- true
return
}
}
}
}