socketServerWIthSelect02.cpp

//server
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <iostream>
#include <string>
#include <winsock2.h>
#include <ws2tcpip.h>
#pragma comment(lib, "ws2_32.lib")
#pragma warning( disable : 4996)
#define TRUE 1
#define FALSE 0
#define PORT 5555
using namespace std;

int main(int argc, char *argv[])
{
    int opt = TRUE;
    int master_socket, addrlen, new_socket, client_socket[30], max_clients = 30, activity, i, valread, sd, sdBis;
    int max_sd;
    struct sockaddr_in address;
    WSADATA WSAData;
    WSAStartup(MAKEWORD(2, 0), &WSAData);
    char buffer[1024];
    fd_set readfds;
    const char *message = "Welcome to FoD";
    for (i = 0; i < max_clients; i++)
    {
        client_socket[i] = 0;
    }
    if ((master_socket = socket(AF_INET, SOCK_STREAM, 0)) == 0)
    {
        perror("socket failed");
        exit(EXIT_FAILURE);
    }
    /*int Socketerror = WSAGetLastError();
    cout << Socketerror << endl;*/
    if (setsockopt(master_socket, SOL_SOCKET, SO_REUSEADDR, (char *)&opt, sizeof(opt)) < 0)
    {
        perror("setsockopt");
        exit(EXIT_FAILURE);
    }
    address.sin_family = AF_INET;
    address.sin_addr.s_addr = INADDR_ANY;
    address.sin_port = htons(PORT);
    if (bind(master_socket, (struct sockaddr *)&address, sizeof(address)) < 0)
    {
        perror("bind failed");
        exit(EXIT_FAILURE);
    }
    printf("Listener on port %d \n", PORT);
    if (listen(master_socket, 3) < 0)
    {
        perror("listen");
        exit(EXIT_FAILURE);
    }
    addrlen = sizeof(address);
    puts("Waiting for connections ...");

    while (TRUE)
    {
        FD_ZERO(&readfds);
        FD_SET(master_socket, &readfds);
        max_sd = master_socket;
        for (i = 0; i < max_clients; i++)
        {
            sd = client_socket[i];
            if (sd > 0)
            {
                FD_SET(sd, &readfds);
            }
            if (sd > max_sd)
            {
                max_sd = sd;
            }
        }
        activity = select(max_sd + 1, &readfds, NULL, NULL, NULL);
        if ((activity < 0) && (errno != EINTR))
        {
            printf("select error");
        }
        if (FD_ISSET(master_socket, &readfds))
        {
            if ((new_socket = accept(master_socket, (struct sockaddr *)&address, (socklen_t*)&addrlen)) < 0)
            {
                perror("accept");
                exit(EXIT_FAILURE);
            }
            printf("New connection , socket fd is %d , ip is : %s , port : %d\n", new_socket, inet_ntoa(address.sin_addr), ntohs(address.sin_port));
            if (send(new_socket, message, strlen(message), 0) != strlen(message))
            {
                perror("send");
            }
            puts("Welcome message sent successfully");
            for (i = 0; i < max_clients; i++)
            {
                if (client_socket[i] == 0)
                {
                    client_socket[i] = new_socket;
                    printf("Adding to list of sockets as %d\n", i);

                    break;
                }
            }
        }
        for (i = 0; i < max_clients; i++)
        {
            memset(buffer, 0, sizeof buffer);
            sd = client_socket[i];
            if (FD_ISSET(sd, &readfds))
            {
                if ((valread = recv(sd, buffer, 1024, 0)) < 0)
                {
                    getpeername(sd, (struct sockaddr*)&address, (socklen_t*)&addrlen);
                    printf("Host disconnected , ip %s , port %d \n", inet_ntoa(address.sin_addr), ntohs(address.sin_port));
                    closesocket(sd);
                    client_socket[i] = 0;
                }
                else
                {
                    buffer[valread] = '\0';
                    cout << buffer << endl;
                    for (i = 0; i < max_clients; i++)
                    {
                        send(client_socket[i], buffer, strlen(buffer), 0);
                    }
                }
            }
        }
    }

    system("pause");
}

//client
#include <string>
#include <iostream>
#include <winsock2.h>
#include <Ws2tcpip.h>
#include <thread>
#pragma comment(lib, "ws2_32.lib")
using namespace std;

void *sendMessage(void *sock_desc)
{
    while (TRUE)
    {
        string talk = "";
        getline(cin, talk);
        if (send(*((int *)sock_desc), talk.c_str(), sizeof(talk) + 1, 0) < 0)
        {
            cout << "Send fail" << endl;
        }
    }
}

void *receiveMessage(void *sock_desc)
{
    char responce[2000];
    while (TRUE)
    {
        memset(responce, 0, sizeof responce);
        if (recv(*((int *)sock_desc), responce, sizeof(responce), 0) < 0)
        {
            puts("recv failed");

        }
        cout << responce << endl;
    }
}

int main()
{
    WSADATA WSAData;
    SOCKET server;
    int sock;
    SOCKADDR_IN addr;
    WSAStartup(MAKEWORD(2, 0), &WSAData);
    server = socket(AF_INET, SOCK_STREAM, 0);
    InetPton(AF_INET, "192.168.1.16", &addr.sin_addr.s_addr);
    addr.sin_family = AF_INET;
    addr.sin_port = htons(5555);
    sock = server;
    int * newSocket = static_cast<int*>(malloc(1));
    *newSocket = sock;
    if (connect(server, (SOCKADDR *)&addr, sizeof(addr)) == 0)
    {
        cout << "Connected to server!" << endl;
        /*while (talk != "quit")
        {
            memset(responce, 0, sizeof responce);
            if (recv(server, responce, sizeof(responce), 0) > 0)
            {
                cout << responce << endl;
            }
            else
            {
                getline(cin, talk);
                if (talk.c_str() != NULL)
                {
                    if (send(server, talk.c_str(), sizeof(talk), 0) <= 0)
                    {
                        talk = "quit";
                    }
                }
            }
        }*/
        //thread(&sendThread, NULL, sendMessage((void *)server));
        //sendThread = thread(sendMessage((void *)server), this);
        thread sendThread(sendMessage, (void *)newSocket);
        thread receiveThread(receiveMessage, (void *)newSocket);
        sendThread.join();
        receiveThread.join();
        closesocket(server);
        WSACleanup();
        cout << "Server has closed." << endl << endl;
    }
    else
    {
        cout << "Couldn't connect to server." << endl;
    }
    system("pause");
}