Forward unix socket to tcp socket

unix-to-tcp.go

package main

import (
	"io"
	"log"
	"net"
	"os"
)

const (
	UNIX_ADDR = "/tmp/fwd.sock"
	TCP_ADDR  = "127.0.0.1:22"
)

func main() {
	os.Remove(UNIX_ADDR)
	l, err := net.Listen("unix", UNIX_ADDR)
	if err != nil {
		log.Fatal(err)
	}
	log.Printf("listening on %s", UNIX_ADDR)
	for {
		uconn, err := l.Accept()
		if err != nil {
			log.Printf("accept failed: %s", err)
			continue
		}
		go fwd(uconn)
	}
}

func fwd(uconn net.Conn) {
	defer uconn.Close()
	tconn, err := net.Dial("tcp", TCP_ADDR)
	if err != nil {
		log.Printf("tcp dial failed: %s", err)
		return
	}
	log.Printf("connected to %s", tconn.RemoteAddr())
	go io.Copy(uconn, tconn)
	io.Copy(tconn, uconn)
	log.Printf("disconnected")
}