UDP绑定：地址已在使用中 [英] UDP bind: Address already in use

问题描述

我不知道 node.js 。

我发送 UDP C ++ 中的数据包，我想在 node.js 中显示它们。

I am sending UDP packets in C++ and I want to show them in node.js.

问题是两者都试图占用IP /端口。根据我运行的一个，另一个失败。我应该如何解决这个问题？

The problem is that both try to occupy the IP/port. Depending on which one I run, the other one fails. How should I fix this problem?

main.cpp

// g++ main.cpp -o main -std=c++11 -lboost_system -pthread

#include <iostream>
#include <stdio.h>
#include <string>
#include <boost/asio.hpp>

using boost::asio::ip::udp;


int main(int argc, char* argv[])
{

    const int port=1414;
    const std::string ip="127.0.0.1";

    boost::asio::io_service io_service;
    udp::resolver resolver(io_service);

    udp::endpoint client_endpoint = *resolver.resolve({udp::v4(), ip, std::to_string(port)});
    udp::socket socket(io_service, udp::endpoint(udp::v4(), port));
    boost::asio::socket_base::reuse_address option(true);
    socket.set_option(option);

    std::string data;
    for(long i=0;true;i++)
    {
        data=std::to_string(i+1)+"th packet";
        socket.send_to(boost::asio::buffer(data.c_str(), data.length()+1), client_endpoint);
        usleep(10);
    }

    return 0;
}

app.js

var PORT = 1414;
var HOST = '127.0.0.1';

var dgram = require('dgram');
var server = dgram.createSocket('udp4');

server.on('listening', function () {
    var address = server.address();
    console.log('UDP Server listening on ' + address.address + ":" + address.port);
});

server.on('message', function (message, remote) {
    console.log(remote.address + ':' + remote.port +' - ' + message);

});

server.bind(PORT, HOST);

如果我运行 C ++ js 一，错误是：

If I run the C++ file and then the js one, the error is this:

events.js:160
      throw er; // Unhandled 'error' event
      ^

Error: bind EADDRINUSE 127.0.0.1:1414
    at Object.exports._errnoException (util.js:1012:11)
    at exports._exceptionWithHostPort (util.js:1035:20)
    at dgram.js:221:18
    at _combinedTickCallback (internal/process/next_tick.js:77:11)
    at process._tickCallback (internal/process/next_tick.js:98:9)
    at Module.runMain (module.js:577:11)
    at run (bootstrap_node.js:352:7)
    at startup (bootstrap_node.js:144:9)
    at bootstrap_node.js:467:3

但是，如果我先运行 js 文件，然后运行 C ++ / boost> :: boost :: exception_detail :: clone_impl< boost :: exception_detail :: error_info_injector< boost ::'的实例时，调用/ p>

While, if I run the js file first and then the C++ one, I receive:

terminate called after throwing an instance of 'boost::exception_detail::clone_impl<boost::exception_detail::error_info_injector<boost::system::system_error> >'
  what():  bind: Address already in use
Aborted (core dumped)

推荐答案

您需要设置 reuseAddr：true 创建套接字：

You need to set reuseAddr: true when creating your socket:

var server = dgram.createSocket({ type: 'udp4', reuseAddr: true });

您还需要更改在C ++端创建套接字的方式。目前，您正在使用的 udp :: socket 构造函数签名将导致套接字立即绑定。不幸的是，您需要先< 绑定之前设置 reuse_address 选项。要做到这一点，尝试这个intead：

You will also need to change how you create your socket on the C++ side. Currently the udp::socket constructor signature you're using will cause the socket to bind immediately. Unfortunately, you need to set the reuse_address option first before binding. To do that, try this intead:

udp::socket socket(io_service, udp::v4());
socket.set_option(boost::asio::socket_base::reuse_address(true));
socket.bind(udp::endpoint(udp::v4(), port));

这篇关于UDP绑定：地址已在使用中的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！