server.c

#include <stdio.h>
#include <stdlib.h>
#include <sys/socket.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <string.h>
#include <time.h>
#include "config.h" // Contient le port du serveur

#define CLIENT_PORT 4004
#define IMGMAX 100000

int main(){

    /**
     * socket
     * Je crée le socket client
     */
    int client_fd = socket(AF_INET,SOCK_STREAM,0);perror("socket");
    // Si la création échoue je ferme mon programme
    if(client_fd == -1) return EXIT_FAILURE;

    /**
     * bind
     * Je relie le socket à un port et une ip avec la fonction bind()
     */
    struct sockaddr_in client_addr = {
        .sin_addr.s_addr = INADDR_ANY,
        .sin_family = AF_INET,
        .sin_port = htons(CLIENT_PORT)
    };
    int error = bind(client_fd,(struct sockaddr*)&client_addr,sizeof client_addr);perror("bind");
    if(error == -1) { close(client_fd); return EXIT_FAILURE; }



    /**
     * connect
     * Je connecte mon socket client au socket server situé en 127.0.0.1:SERVER_PORT
     */
    struct sockaddr_in server_addr = {
        // .sin_addr.s_addr = INADDR_ANY,
        .sin_addr.s_addr = inet_addr("127.0.0.1"),
        .sin_family = AF_INET,
        .sin_port = htons(SERVER_PORT)
    };
    error = connect(client_fd,(struct sockaddr*)&server_addr,sizeof server_addr);perror("connect");

    if(error == -1) { close(client_fd); return EXIT_FAILURE;}





    /**
     * Ping ? Je reçois un message du server ?
     * J'attend un message du serveur avec la fonction bloquante recv()
     */
    FILE* rcvimg = fopen("received.jpg","a+");

    char reponse[IMGMAX];memset(reponse,0,IMGMAX);
    int reponse_length = recv(client_fd,reponse,sizeof(reponse),0);perror("recv");
    if(reponse_length == -1) { close(client_fd); return EXIT_FAILURE; }
    fwrite(reponse,1,reponse_length,rcvimg);
    printf("Received %d bytes\n",reponse_length);

    /**
     * Pong ! J'ai bien reçu le message du serveur je renvoi PONG !
     */
    int request_length = send(client_fd,"Received image",BUFSIZ,0);perror("send");
    if(request_length == -1){ close(client_fd); return EXIT_FAILURE;}
    


    close(client_fd);

    return EXIT_SUCCESS;

}