GO TCP代理(可代理SQLSERVER\MYSQL\ORCALE)

用nginx代理不知道为什么内网能用,外网用不了,改用go写个代理临时用下,直接上代码

 

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package main   import (     "fmt"     "io"     "log"     "net" )   var addr string = "0.0.0.0:51415"  //代理服务端口 var dest_addr string = "192.168.2.120:1433"  //目标地址   func main() {     defer func() {         if err := recover(); err != nil {             log.Println("捕获异常并恢复,异常是:", err)         }     }()       listener, err := net.Listen("tcp", addr)     if err != nil {         log.Printf("Failed to start listener: %s", err)         return     }     defer listener.Close()       fmt.Println("Proxy server is listening on ", addr)       for {         client, err := listener.Accept()         if err != nil {             log.Printf("Failed to accept client connection: %s", err)             continue         }           go handleClient(client, dest_addr)     } }   func handleClient(client net.Conn, remoteAddr string) {     remote, err := net.Dial("tcp", remoteAddr)     if err != nil {         log.Printf("Failed to connect to remote server: %s", err)         client.Close()         return     }       go func() {           _, err := io.Copy(remote, client)         if err != nil {             log.Printf("Error copying from client to remote: %s", err)         }     }()       _, err = io.Copy(client, remote)     if err != nil {         log.Printf("Error copying from remote to client: %s", err)     }       remote.Close()     client.Close() }