为什么在使用 POCO 库的 ICMP 客户端 ping 可达主机时出现 IOException？

Question

当 ping 到可访问的主机时，我无法使用 POCO ping 功能获取 IOException。下面是我的 ping 示例：

#include "Poco/Net/ICMPClient.h"
#include "Poco/Net/IPAddress.h"
#include "Poco/Net/ICMPEventArgs.h"
#include "Poco/Delegate.h"
#include <iostream>


using Poco::Net::ICMPClient;
using Poco::Net::IPAddress;
using Poco::Net::ICMPEventArgs;


class PingExample {
public:
PingExample(): 
    _icmpClient(IPAddress::IPv4)
{
    _icmpClient.pingBegin += Poco::delegate(this, &PingExample::onBegin);
    _icmpClient.pingReply += Poco::delegate(this, &PingExample::onReply);
    _icmpClient.pingError += Poco::delegate(this, &PingExample::onError);
    _icmpClient.pingEnd   += Poco::delegate(this, &PingExample::onEnd);
}


int start_ping(const std::string& host)
{
    _icmpClient.ping(host);
}


void onBegin(const void* pSender, ICMPEventArgs& args)
{
    std::cout << "Pinging " << args.hostName() << " [" << args.hostAddress() << "] with " << args.dataSize() << " bytes of data:" 
       << std::endl << "---------------------------------------------" << std::endl;
}

void onReply(const void* pSender, ICMPEventArgs& args)
{
    std::cout << "Reply from " << args.hostAddress()
       << " bytes=" << args.dataSize() 
       << " time=" << args.replyTime() << "ms"
       << " TTL=" << args.ttl();
}

void onError(const void* pSender, ICMPEventArgs& args)
{
    std::cout << args.error();
}

void onEnd(const void* pSender, ICMPEventArgs& args)
{
    std::cout << std::endl << "--- Ping statistics for " << args.hostName() << " ---"
       << std::endl << "Packets: Sent=" << args.sent() << ", Received=" << args.received()
       << " Lost=" << args.repetitions() - args.received() << " (" << 100.0 - args.percent() << "% loss),"
       << std::endl << "Approximate round trip times in milliseconds: " << std::endl
       << "Minimum=" << args.minRTT() << "ms, Maximum=" << args.maxRTT()  
       << "ms, Average=" << args.avgRTT() << "ms" 
       << std::endl << "------------------------------------------";
}

private:
       ICMPClient  _icmpClient;
};

int main(int argc, char** argv)
{
    PingExample p;
    p.start_ping("localhost");
    while (true);
    return 0;
}

当运行此代码时出现以下异常：

terminate called after throwing an instance of 'Poco::IOException'
what():  I/O error
Aborted (core dumped)

当

时出现相同的异常

运行 Net/samples/Ping/src/Ping.cpp 没有任何参数的测试用例（在这种情况下，它应该 ping 到本地主机）或将目标指定为参数时
正在尝试 ping 到 SocketAddres。
尝试 ping 到可访问的主机而不是本地主机。

出现IOException异常的原因是什么？

Answer 1

ICMPClient 使用原始套接字。这意味着您必须运行您的可执行文件具有 root 权限。看这里：Raw sockets need root priviliege

为什么在使用 POCO 库的 ICMP 客户端 ping 可达主机时出现 IOException？

Why getting IOException when pinging to rechable host using ICMPClient of POCO library?

ping

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