351 lines
9.2 KiB
C
351 lines
9.2 KiB
C
/*test */
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/* librairie standard ... */
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#include <stdlib.h>
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/* pour getopt */
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#include <unistd.h>
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/* déclaration des types de base */
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#include <sys/types.h>
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/* constantes relatives aux domaines, types et tcps */
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#include <sys/socket.h>
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/* constantes et structures propres au domaine UNIX */
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#include <sys/un.h>
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/* constantes et structures propres au domaine INTERNET */
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#include <netinet/in.h>
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/* structures retournées par les fonctions de gestion de la base de
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données du réseau */
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#include <netdb.h>
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/* pour les entrées/sorties */
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#include <stdio.h>
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/* pour la gestion des erreurs */
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#include <errno.h>
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#define DEFAULTPORT 9000
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#define MSG_LENGTH 10
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#define NB_CLIENTS 1
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#define TCP_BUFFER_LEN 2000
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// affiche l'utilisation de la fonction
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void usage(char* prog) {
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printf("usage: %s [-h][-p|-s][-u|-t][-n ##]\n", prog);
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}
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// remplit le message avec le charactere motif
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void construire_message(char* message, char motif, int lg) {
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for (int i = 0; i < lg; ++i) {
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message[i] = motif;
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}
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message[lg] = '\0';
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}
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// essaye de recevoir un message par udp et traite le message.
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void recvudp(int sock, char* buffer, int buf_len, void* addr, unsigned int addr_len) {
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int lg_recv = recvfrom(sock, buffer, buf_len, 0, (struct sockaddr*) addr, &addr_len);
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if (lg_recv == -1) {
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perror("Message could not be recieved, Error: ");
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exit(1);
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} else if (lg_recv < buf_len) {
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fprintf(stderr, "Only %i from %i characters have been reviewed.", lg_recv, buf_len);
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exit(1);
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} else {
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buffer[lg_recv] = '\0';
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printf("message revieved: %s\n", buffer);
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}
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}
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// essaye d'envoyer un message par udp et gere les erreurs
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void sendudp(int sock, char* message, int msg_len, void* addr, unsigned int addr_len) {
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int lg_sent = sendto(sock, message, msg_len, 0, (struct sockaddr*) addr, addr_len);
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if (lg_sent == -1) {
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perror("Message could not be sent, Error: ");
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exit(1);
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} else if (lg_sent < MSG_LENGTH) {
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fprintf(stderr, "Only %i from %i characters have been sent.", lg_sent, MSG_LENGTH);
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exit(1);
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}
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printf("message sent: %s\n", message);
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}
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/* void recvtcp(int sock) { */
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/* } */
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/* affiche les lg premier characteres de message */
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void afficher_message(char* message, int lg) {
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message[lg] = '\0';
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printf("message construit: %s", message);
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}
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int main (int argc, char **argv)
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{
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int c;
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extern char *optarg;
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extern int optind;
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int nb_message = -1; /* Nb de messages à envoyer ou à recevoir, par défaut : 10 en émission, infini en réception */
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int source = -1 ; /* 0=puits, 1=source */
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char* hostname; /* stocke la chaine de charactere de l'url avec la quelle on communique */
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int tcp = -1; /* 0=tcp, 1=udp */
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int sock; /* identifiant du buffer */
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char* message; /* stocke le message à onvoyer ou à recevoir */
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struct hostent *hp; /* structure pour rérupérer l'addresse de l'url */
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struct sockaddr_in addr_local;
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struct sockaddr_in addr_distant;
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/* taille de la structure d'addresse */
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unsigned int addr_distant_len = sizeof(addr_distant);
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while ((c = getopt(argc, argv, "hpst:u:n:")) != -1) {
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switch (c) {
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// affiche l'utilisation du programme
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case 'h':
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usage(argv[0]);
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return 0;
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// mode puit
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case 'p':
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if (source == 1) {
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usage(argv[0]);
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exit(1);
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}
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source = 0;
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break;
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// mode source
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case 's':
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if (source == 0) {
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usage(argv[0]);
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exit(1) ;
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}
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source = 1;
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break;
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// nombre de messages à afficher
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case 'n':
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nb_message = atoi(optarg);
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break;
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// utilise le protocole UDP
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case 'u':
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if (tcp == 1) {
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usage(argv[0]);
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exit(1);
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}
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tcp = 0;
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hostname = optarg;
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break;
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// utilise le protocole TCP
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case 't':
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if (tcp == 0) {
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usage(argv[0]);
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exit(1);
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}
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tcp = 1;
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hostname = optarg;
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break;
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// argument non reconnu
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default:
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usage(argv[0]);
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exit(1);
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break;
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}
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}
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// si le protocole n'a pas été défini par l'utilisateur, utiliser TCP
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if (tcp == -1) {
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tcp = 1;
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}
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// si le mode de fonctionnement(source/puit) n'a pas été défini -> ERREUR
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if (source == -1) {
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printf("outside\n");
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usage(argv[0]);
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/* printf("usage: cmd [-p|-s][-n ##]\n"); */
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exit(1) ;
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}
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/* if (source == 1) */
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/* printf("on est dans le source\n"); */
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/* else */
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/* printf("on est dans le puits\n"); */
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/* if (nb_message != -1) { */
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/* if (source == 1) */
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/* printf("nb de tampons à envoyer : %d\n", nb_message); */
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/* else */
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/* printf("nb de tampons à recevoir : %d\n", nb_message); */
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/* } else { */
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/* if (source == 1) { */
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/* nb_message = 10 ; */
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/* printf("nb de tampons à envoyer = 10 par défaut\n"); */
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/* } else { */
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/* // changed envoyer to recevoir */
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/* printf("nb de tampons à recevoir = infini\n"); */
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/* } */
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/* } */
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if (tcp) {
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sock = socket(AF_INET, SOCK_STREAM, 0);
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} else /* if udp */ {
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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}
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if (sock < 0) {
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perror("Error creating socket:");
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exit(1);
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}
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printf("socket created\n");
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// remplissage de l'addresse locale
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memset(&addr_local, 0, sizeof(addr_local));
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addr_local.sin_family = AF_INET;
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addr_local.sin_port = DEFAULTPORT;
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addr_local.sin_addr.s_addr = INADDR_ANY;
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printf("address built\n");
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// liaison entre l'addresse locale et le buffer(sock)
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if (bind(sock, (struct sockaddr*) &addr_local, (sizeof(addr_local))) < 0 ) {
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perror("Error while binding socket: ");
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exit(1);
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}
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printf("socket bound\n");
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memset(&addr_distant, 0, sizeof(addr_local));
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addr_distant.sin_family = AF_INET;
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addr_distant.sin_port = DEFAULTPORT;
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hp = gethostbyname(hostname);
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if (hp == NULL) {
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printf("hostname not found\n");
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herror("Error: ");
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exit(1);
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}
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memcpy(&addr_distant.sin_addr.s_addr, hp->h_addr, hp->h_length);
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printf("distant address built\n");
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if (tcp) {
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if (source) {
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// envoie de connection au serveur TCP
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if (connect(sock,(struct sockaddr*)&addr_distant, sizeof(addr_distant)) == -1) {
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printf("echec de la connexion\n");
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exit(1);
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}
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} else {
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// ouverture pour l'écoute de connexions
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if (listen(sock, NB_CLIENTS) < 0) {
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perror("Server could not listen: ");
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exit(1);
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} else {
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printf("listening\n");
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}
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// accepte la première demande de connexion
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if (accept(sock, (struct sockaddr*) &addr_distant, &addr_distant_len) < 0) {
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perror("Server could not accept connection: ");
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exit(1);
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} else {
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printf("accepting request\n");
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}
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}
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}
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/* if (!tcp) /\* if udp activated *\/ { */
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/* printf("pas tcp\n"); */
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/* memset(&addr_distant, 0, sizeof(addr_local)); */
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/* addr_distant.sin_family = AF_INET; */
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/* addr_distant.sin_port = DEFAULTPORT; */
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/* hp = gethostbyname(hostname); */
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/* if (hp == NULL) { */
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/* printf("hosname not found\n"); */
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/* /\* herror("Error: "); *\/ */
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/* exit(1); */
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/* } */
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/* printf("hostname found\n"); */
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/* memcpy(&addr_distant.sin_addr.s_addr, hp->h_addr, hp->h_length); */
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/* } else /\* tcp activated *\/{ */
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/* if (source) { */
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/* memset(&addr_distant, 0, sizeof(addr_local)); */
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/* addr_distant.sin_family = AF_INET; */
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/* addr_distant.sin_port = DEFAULTPORT; */
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/* hp = gethostbyname(hostname); */
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/* if (hp == NULL) { */
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/* printf("hosname not found\n"); */
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/* /\* herror("Error: "); *\/ */
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/* exit(1); */
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/* } */
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/* printf("hostname found\n"); */
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/* memcpy(&addr_distant.sin_addr.s_addr, hp->h_addr, hp->h_length); */
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/* if (connect(sock,(struct sockaddr*)&addr_distant, sizeof(addr_distant)) == -1) { */
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/* printf("echec de la connexion\n"); */
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/* exit(1); */
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/* } */
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/* } else { */
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/* if (listen(sock, NB_CLIENTS) < 0) { */
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/* perror("Server could not listen: "); */
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/* exit(1); */
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/* } else { */
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/* printf("listening\n"); */
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/* } */
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/* if (accept(sock, (struct sockaddr*) &addr_distant, &addr_distant_len) < 0) { */
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/* perror("Server could not accept connection: "); */
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/* exit(1); */
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/* } else { */
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/* printf("accepting request\n"); */
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/* } */
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/* } */
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/* } */
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message = malloc((MSG_LENGTH + 1) * sizeof(char));
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if (tcp) /* tcp activated */ {
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if (source) {
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for(int i=0;i<nb_message;i++) {
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construire_message(message, (char)((i%26)+97), MSG_LENGTH);
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afficher_message(message, MSG_LENGTH);
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printf("\t\tsending message: \n");
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send(sock, message, MSG_LENGTH, 0);
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}
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if (shutdown(sock, SHUT_RDWR)==-1) {
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perror("echec de destruction du socket: \n");
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}
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} else /*puit */ {
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char buffer[TCP_BUFFER_LEN];
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size_t nb_octed_read = read(sock, buffer, TCP_BUFFER_LEN - 1);
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if (nb_octed_read < 0) {
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perror("Could not read octed-stream: ");
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exit(1);
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} else {
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buffer[nb_octed_read] = '\0';
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printf("message recieved: %s\n", buffer);
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}
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}
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} else /* udp activated */ {
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if (source) {
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if (nb_message < 0) {
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nb_message = 10;
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}
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for (int i = 0; i < nb_message; ++i) {
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construire_message(message, i % 26 + 'a', MSG_LENGTH);
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sendudp(sock, message, MSG_LENGTH, &addr_distant, sizeof(addr_distant));
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}
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} else {
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if (nb_message < 0) {
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while (1) {
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recvudp(sock, message, MSG_LENGTH, &addr_distant, sizeof(addr_distant));
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}
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} else {
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for (int i = 0; i < nb_message; ++i) {
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recvudp(sock, message, MSG_LENGTH, &addr_distant, sizeof(addr_distant));
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}
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}
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printf("puit not implemented\n");
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}
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}
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if (close(sock) < 0) {
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perror("Error closing socket:");
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exit(1);
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}
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return 0;
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}
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