cn-lab2-server

// cn-lab2-server.cpp: определяет точку входа для консольного приложения.
//

#include "stdafx.h"
#include <winsock2.h>
#include <iostream>
#include <windows.h>
#include <sstream>
#include <thread>

#pragma comment(lib, "ws2_32.lib")

using namespace std;

int client_processing(SOCKET my_sock, const sockaddr_in client_addr, const int client_addr_size, char recv_buff[]) {
    int a, b, c;
    stringstream ss;
    ss << recv_buff;
    ss >> a >> b >> c;
    string triangle_exist = "false";
    if ((a < b + c) && (b < a + c) && (c < a + b))
        triangle_exist = "true";
    sendto(my_sock, triangle_exist.c_str(), triangle_exist.length(), 0, (sockaddr *)&client_addr, client_addr_size);
    cout << "Answer sent" << endl;
    return 0;
}

int port_listen(SOCKET my_sock) {
    while (true) {
        sockaddr_in client_addr;
        int client_addr_size = sizeof(client_addr);
        char recv_buff[1024];
        int len = recvfrom(my_sock, &recv_buff[0], sizeof(recv_buff) - 1, 0, (sockaddr *)&client_addr, &client_addr_size);
        if (len < 0)
            return 0;
        cout << "Request received" << endl;
        recv_buff[len] = '\0';
        thread client(client_processing, my_sock, client_addr, client_addr_size, recv_buff);
    }
    return 0;
}

int main()
{
    cout << "cn-lab2 var10 server start" << endl;
    WSAData wsadata;
    WSAStartup(0x0202, &wsadata);
    cout << "Winsock2 initialized" << endl;
    SOCKET my_sock;
    my_sock = socket(AF_INET, SOCK_DGRAM, 0);
    if (my_sock == INVALID_SOCKET) {
        cout << "Create socket error " << WSAGetLastError() << endl;
        WSACleanup();
        return 1;
    }
    cout << "Socket created successfully" << endl;
    sockaddr_in local_addr;
    local_addr.sin_family = AF_INET;
    local_addr.sin_addr.S_un.S_addr = 0;
    local_addr.sin_port = htons(5002);
    if (::bind(my_sock, (sockaddr *)&local_addr, sizeof(local_addr))) {
        cout << "Error bind " << WSAGetLastError() << endl;
        closesocket(my_sock);
        WSACleanup();
        return 2;
    }
    cout << "Binding successful" << endl;
    thread listen(port_listen, ref(my_sock));
    string s;
    do {
        cin >> s;
    } while (s != "stop");
    shutdown(my_sock, SD_BOTH);
    closesocket(my_sock);
    if (listen.joinable())
        listen.join();
    listen.~thread();
    WSACleanup();
    return 0;
}