cn-lab1-server

// CN-lab1-server.cpp: определяет точку входа для консольного приложения.
//

#include "stdafx.h"
#include <winsock2.h>
#include <iostream>
#include <thread>
#include <string>

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

using namespace std;

int client_process(SOCKET sock) {
    sockaddr_in client_addr;
    int client_addr_size = sizeof(client_addr);
    SOCKET client_sock = accept(sock, (sockaddr *)&client_addr, &client_addr_size);
    if (client_sock == INVALID_SOCKET) {
        int wsa_error = WSAGetLastError();
        if (wsa_error != 10004)
            cout << "Accept error " << WSAGetLastError() << endl;
        return 0;
    }
    cout << "Client connected" << endl;
    while (true) {
        char recv_buff[1024];
        int len = recv(client_sock, &recv_buff[0], sizeof(recv_buff) - 1, 0);
        recv_buff[len] = '\0';
        string s = recv_buff, is_pal = "1";
        if (s == "&close")
            break;
        cout << "Request received" << endl;
        for (int i = 0; i <= s.length() / 2; i++) {
            if (s[i] != s[s.length() - 1 - i]) {
                is_pal[0] = '0';
                break;
            }
        }
        send(client_sock, is_pal.c_str(), is_pal.length(), 0);
        cout << "Answer sent" << endl;
    }
    closesocket(client_sock);
    cout << "Client disconnected" << endl;
    return 0;
}

int _tmain(int argc, _TCHAR* argv[])
{
    cout << "cn-lab1 var10 server start" << endl;
    WSAData wsadata;
    WSAStartup(0x0202, &wsadata);
    SOCKET sock;
    sock = socket(AF_INET, SOCK_STREAM, 0);
    if (sock == INVALID_SOCKET) {
        cout << "Create socket error " << WSAGetLastError() << endl;
        WSACleanup();
        return 1;
    }
    cout << "Main 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(5001);
    if (::bind(sock, (sockaddr *) &local_addr, sizeof(local_addr))) {
        cout << "Bind error " << WSAGetLastError() << endl;
        closesocket(sock);
        WSACleanup();
        return 2;
    }
    cout << "Port 5001 bound" << endl;
    if (listen(sock, 16))
    {
        cout << "Listen error " << WSAGetLastError() << endl;
        closesocket(sock);
        WSACleanup();
        return  3;
    }
    cout << "Listening port 5001" << endl;
    thread client(client_process, ref(sock));
    string s;
    do {
        cin >> s;
    } while (s != "stop" && s != "exit");
    closesocket(sock);
    if (client.joinable())
        client.join();
    WSACleanup();
    cout << "cn-lab1 var10 server stopped" << endl;
    return 0;
}