proxyport/app/proxy.go

package app

import (
	"fmt"
	"git.makemake.in/test/mycommon/mylog"
	"io"
	"net"
)

func Run() {
	for _, item := range ProxyMap {
		go listenTcp(item)
	}

	select {}
}

func listenTcp(item ProxyItem) {
	localAddr := fmt.Sprintf(":%d", item.LocalPort)
	listen, err := net.Listen("tcp", localAddr)
	if err != nil {
		mylog.Errorf("listen err: %s", localAddr, err)
		return
	}

	mylog.Infof("listen %s", localAddr)

	for {
		conn, err := listen.Accept()
		if err != nil {
			mylog.Errorf("conn accept err: %s", localAddr, err)
			return
		}

		go proxyTcp(conn, item)
	}
}

func proxyTcp(conn net.Conn, item ProxyItem) {
	//defer conn.Close()

	for _, addr := range item.RemoteAddr {
		remoteConn, err := net.Dial("tcp", addr)
		if err != nil {
			mylog.Errorf("connect remote err: %s\n", err)
			return
		}

		mylog.Infof("connect remote %s", addr)

		go copyConn(conn, remoteConn)
		go copyConn(remoteConn, conn)
	}

}

func copyConn(src, dst net.Conn) {
	defer func() {
		src.Close()
		dst.Close()

		mylog.Warn("close conn")
	}()

	_, err := io.Copy(src, dst)
	if err != nil {
		mylog.Error(err)
		return
	}

	//fmt.Println(written)
}