Skip to content

Instantly share code, notes, and snippets.

@ncode
Last active August 29, 2015 14:05
Show Gist options
  • Save ncode/fd4fbd0bd5426fb1af4e to your computer and use it in GitHub Desktop.
Save ncode/fd4fbd0bd5426fb1af4e to your computer and use it in GitHub Desktop.
package main
import (
"net"
"fmt"
"io"
"os"
)
func main() {
if len(os.Args) != 3 {
fatal("usage: netfwd local remote")
}
localAddr := os.Args[1]
remoteAddr := os.Args[2]
local, err := net.Listen("tcp", localAddr)
if local == nil {
fatal("cannot listen: %v", err)
}
for {
conn, err := local.Accept()
if conn == nil {
fatal("accept failed: %v", err)
}
go forward(conn, remoteAddr)
}
}
func forward(local net.Conn, remoteAddr string) {
remote, err := net.Dial("tcp", "", remoteAddr)
if remote == nil {
fmt.Fprintf(os.Stderr, "remote dial failed: %v\n", err)
return
}
go io.Copy(local, remote)
go io.Copy(remote, local)
}
func fatal(s string, a ... interface{}) {
fmt.Fprintf(os.Stderr, "netfwd: %s\n", fmt.Sprintf(s, a))
os.Exit(2)
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment