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package main
import (
"flag"
"fmt"
"io"
"net"
"os"
)
func main() {
localAddr := flag.String("l", "192.168.122.1:3306", "local address we listen on")
remoteAddr := flag.String("r", "127.0.0.1:3306", "remote address we proxy to")
verbose := flag.Bool("v", false, "log connection")
flag.Parse()
local, err := net.Listen("tcp", *localAddr)
if err != nil {
fmt.Fprintf(os.Stderr, "listening failed: %s \n", err.Error())
os.Exit(-1)
}
for {
conn, err := local.Accept()
if err != nil {
fmt.Fprintf(os.Stderr, "accepting failed: %s", err.Error())
os.Exit(-1)
}
go forward(conn, *remoteAddr, *verbose)
}
}
func forward(local net.Conn, remoteAddr string, verbose bool) {
remote, err := net.Dial("tcp", remoteAddr)
if err != nil {
fmt.Fprintf(os.Stderr, "remote dial failed: %s\n", err.Error())
return
}
go io.Copy(local, remote)
go io.Copy(remote, local)
if verbose {
fmt.Println("message from: " + remoteAddr)
}
}
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