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C-/C++-Quelltext

#include <cstring> // std::memset
#include <iostream>
#include <windows.h>
#include <winsock.h>

const bool InitWinSock();

int main()
{   
    if (!InitWinSock())
    {
         std::cerr << "WinSock konnte nicht gestartet werden!\n" << ::WSAGetLastError() << std::endl;
         return -1;
    }
        
    ::SOCKET connection(::socket(AF_INET, SOCK_STREAM, 0));
    if (connection == INVALID_SOCKET) 
    {
        std::cerr << "Socket konnte nicht erstellt werden!\n" << ::WSAGetLastError() << std::endl;
        return -2;
    }
  
    ::SOCKADDR_IN addr = {0};
    for (unsigned short port(0u); port <= 1000u; ++port)
    {       
        std::memset(&addr, 0, sizeof(::SOCKADDR_IN)); 
        addr.sin_family = AF_INET;
        addr.sin_port = htons(port);
        addr.sin_addr.s_addr = inet_addr("192.168.111.17");  

        if (connect(connection, reinterpret_cast<::SOCKADDR*>(&addr), sizeof(::SOCKADDR)) == SOCKET_ERROR) 
            std::cerr << "Port " << port << ": " << ::WSAGetLastError() << std::endl;   
        else    
            std::cout << "Port " << port << " offen\a" << std::endl;
    }
    std::cout << "Ports 0 ... 1000 getestet!\a" << std::endl;
    std::cin.get();
}

const bool InitWinSock()
{
    ::WSADATA wsa;
    return ::WSAStartup(MAKEWORD(2, 0), &wsa) == 0;
}