在Erlang中如何获取客户端的ip和端口？ [英] In Erlang how to get Client's ip and port?

问题描述

在以下代码中，服务器正在侦听端口2345。接受来自客户端的连接后，它返回 {ok，Socket}

In the following code , server is listening to port 2345. After accepting connection from client it returns {ok, Socket}

start() ->  
{ok, Listen} = gen_tcp:listen(2345, [binary, {packet, 4},  
                                  {reuseaddr, true},  
                                  {active, true}]),  
{ok, Socket} = gen_tcp:accept(Listen).

我想获取客户端的IP和端口，如何通过分析套接字来获取它们？

I want to get client's IP and port, how can I get them by analyzing socket?

推荐答案

使用 inet：peername / 1 。来自文档的功能描述：

Use inet:peername/1. The description of the function from documentation:

peername(Socket) -> {ok, {Address, Port}} | {error, posix()}

              Types:

                 Socket = socket()
                 Address = ip_address()
                 Port = integer() >= 0

              Returns the address and port for the other end of a connection.

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