如何在TCP连接中查找IP:传入客户端的端口 [英] How to find IP:Port of incoming client in TCP Connection

问题描述

从conn, err := listener.Accept()接收到连接后，我想在conn的另一端找到客户端的地址.我尝试使用conn.LocalAddr()和conn.RemoteAddr()(文档)进行此操作. .LocalAddr()仅提供服务器进程的地址. .RemoteAddr()为客户端提供正确的IP，但是端口号与我知道要绑定到的客户端完全不同. 如果有什么不同，我将在同一台计算机上运行两个独立的进程来执行此操作.一个是客户端，一个是服务器.关于我还能如何找到客户端的正确IP:Port的任何想法?我可以使用LocalAddr还是RemoteAddr?

After receiving a connection from conn, err := listener.Accept(), I want to find the address of the client at the other end of the conn. I've tried doing this with conn.LocalAddr() and conn.RemoteAddr() (Documentation). .LocalAddr() just gives the address of the server's process. .RemoteAddr() gives the right IP for the client but a very different port number from what I know the client to be binded to. If it makes any difference, Im doing this with two separate processes running on the same machine. One is a client, one is a server. Any ideas as to how else I can find the correct IP:Port of the client? Am I to use either LocalAddr or RemoteAddr?

推荐答案

在OSX上，使用go 1.4将conn.RemoteAddr()报告的主机/端口组合与netstat输出进行比较是正确的.

On OSX, using go 1.4 the host / port combo reported by conn.RemoteAddr() is correct when compared against netstat output.

package main

import (
  "fmt"
  "net"
  "time"
)

func main() {
  ln, err := net.Listen("tcp", ":8080")
  if err != nil {
    panic(err)
  }
  for {
    conn, err := ln.Accept()
    if err != nil {
      panic(err)
    }
    fmt.Println(conn.RemoteAddr())
    time.Sleep(time.Minute)
    conn.Close()
  }
}

$ go run foo.go
127.0.0.1:63418

$ netstat -an | grep 8080
tcp4       0      0  127.0.0.1.8080         127.0.0.1.63418        ESTABLISHED
tcp4       0      0  127.0.0.1.63418        127.0.0.1.8080         ESTABLISHED

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