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package main
import (
"fmt"
"log"
"net"
)
func main() {
//源端口，目的端口
var fromport, toport int = 2222, 88
fromaddr := fmt.Sprintf("127.0.0.1:%d", fromport)
toaddr := fmt.Sprintf("127.0.0.1:%d", toport)
fromlistener, err := net.Listen("tcp", fromaddr)
if err != nil {
log.Fatal("Unable to listen on: %s, error: %s\n", fromaddr, err.Error())
}
defer fromlistener.Close()
for {
fromcon, err := fromlistener.Accept()
if err != nil {
fmt.Printf("Unable to accept a request, error: %s\n", err.Error())
} else {
fmt.Println("new connect:" + fromcon.RemoteAddr().String())
}
//这边最好也做个协程，防止阻塞
toCon, err := net.Dial("tcp", toaddr)
if err != nil {
fmt.Printf("can not connect to %s\n", toaddr)
continue
}
go handleConnection(fromcon, toCon)
go handleConnection(toCon, fromcon)
}
}
func handleConnection(r, w net.Conn) {
defer r.Close()
defer w.Close()
var buffer = make([]byte, 100000)
for {
n, err := r.Read(buffer)
if err != nil {
break
}
n, err = w.Write(buffer[:n])
if err != nil {
break
}
}
}
|
参考链接：GO语言实现TCP端口转发【代码】_苏南生的CSDN博客-CSDN博客
标签：err,nil,fmt,端口,TCP,GO,net,fromcon From： https://www.cnblogs.com/lvjinlin/p/18123694