Redir replacement written in Go

redir.go

package main

import (
  "net"
  "flag"
  "fmt"
  "io"
  "log"
)

func main() {
  laddr := flag.String("laddr", "127.0.0.1", "address of interface to listen on")
  lport := flag.Int("lport", 8080, "port to listen on")

  caddr := flag.String("caddr", "127.0.0.1", "remote host to connect to")
  cport := flag.Int("cport", 80, "port to connect to")

  flag.Parse()

  fmt.Printf("rediring %s:%d -> %s:%d\n", *laddr, *lport, *caddr, *cport)

  local, err := net.Listen("tcp", fmt.Sprintf("%s:%d", *laddr, *lport))
  if local == nil {
    log.Fatalf("Error listen: %v", err)
  }

  remote := fmt.Sprintf("%s:%d", *caddr, *cport)
  for {
    conn, err := local.Accept()
    if conn == nil {
      log.Printf("Error accept: %v", err)
    }
    go redir(conn, remote)
  }
}

func redir(local net.Conn, addr string) {
  remote, err := net.Dial("tcp", addr)
  if remote == nil {
    log.Printf("Error dial: %v\n", err)
    return
  }
  go io.Copy(local, remote)
  go io.Copy(remote, local)
}

I was trying to setup Vagrant LXC on Archlinux; however the redir package on the AUR did not work, so I write a simple replacement in Go with compatible command line args.