C++使用Boost库加入UDP组播时程序崩溃

程序崩溃情况

• 本程序运行在Oracle VM VirtualBox虚拟的Ubuntu20.04上

  terminate called after throwing an instance of ‘boost::wrapexceptboost::system::system_error’ what(): set_option: No such device 已放弃 (核心已转储) **

• C++使用Boost库加入组播的代码

#include <iostream>
#include <boost/asio.hpp>class MulticastReceiver
{
public:MulticastReceiver(boost::asio::io_context &ioContext, const std::string &multicastAddress, const std::string &listenAddress, int port): ioContext(ioContext),socket(ioContext),multicastEndpoint(boost::asio::ip::address::from_string(multicastAddress), port),listenEndpoint(boost::asio::ip::address::from_string(listenAddress), port){// 创建套接字socket.open(listenEndpoint.protocol());// 设置套接字选项，允许地址重用socket.set_option(boost::asio::ip::udp::socket::reuse_address(true));// 绑定到监听地址socket.bind(listenEndpoint);// 加入组播组socket.set_option(boost::asio::ip::multicast::join_group(multicastEndpoint.address()));}void start(){receive();}private:void receive(){socket.async_receive_from(boost::asio::buffer(buffer), senderEndpoint,[this](const boost::system::error_code &error, std::size_t bytesTransferred){if (!error){// 处理接收到的数据std::cout << "Received: " << std::string(buffer.data(), bytesTransferred) << std::endl;// 继续接收数据receive();}else{std::cerr << "Error receiving data: " << error.message() << std::endl;}});}private:boost::asio::io_context &ioContext;boost::asio::ip::udp::socket socket;boost::asio::ip::udp::endpoint multicastEndpoint;boost::asio::ip::udp::endpoint listenEndpoint;std::array<char, 1024> buffer;boost::asio::ip::udp::endpoint senderEndpoint;
};

---

• Boost库报错信息时No such device

Boost库中boost::asio::ip::udp::socket套接字找不到网卡去加入组播。

• 设置默认路由即可解决程序崩溃问题

route add -net 0.0.0.0 netmask 0.0.0.0 dev enp0s3

• 查看路由表
  

Linux系统中必须设置0.0.0.0的默认路由规则，否则程序加入组播时会宕掉。