Simple TCP proxy in Golang

proxy.go

package main

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

var localAddr *string = flag.String("l", "localhost:9999", "local address")
var remoteAddr *string = flag.String("r", "localhost:80", "remote address")

func copy(send io.Writer, recv io.Reader) {
        written, err := io.Copy(send, recv)
        log.Println("Done proxing, wrote", written, "bytes. Finished with err:", err)
}

func proxyConn(conn *net.TCPConn) {
        rAddr, err := net.ResolveTCPAddr("tcp", *remoteAddr)
        if err != nil {
                log.Fatal(err)
        }

        rConn, err := net.DialTCP("tcp", nil, rAddr)
        if err != nil {
                log.Fatal(err)
        }
        defer rConn.Close()

        log.Println("Starting proxy: ", *conn, *rConn)

        go copy(conn, rConn)
        copy(rConn, conn)
}

func main() {
        flag.Parse()

        fmt.Printf("Listening: %v\nProxying: %v\n\n", *localAddr, *remoteAddr)

        addr, err := net.ResolveTCPAddr("tcp", *localAddr)
        if err != nil {
                log.Fatal(err)
        }

        listener, err := net.ListenTCP("tcp", addr)
        if err != nil {
                log.Fatal(err)
        }

        for {
                conn, err := listener.AcceptTCP()
                if err != nil {
                        log.Fatal(err)
                }
                go proxyConn(conn)
        }
}