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85 lines
2.4 KiB
C
85 lines
2.4 KiB
C
#include <sys/types.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#define BUF_SIZE 500
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int main(int argc, char *argv[]){
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struct addrinfo hints;
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struct addrinfo *result, *rp;
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int sfd, s;
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struct sockaddr_storage peer_addr;
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socklen_t peer_addr_len;
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ssize_t nread;
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char buf[BUF_SIZE];
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if (argc != 2) {
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fprintf(stderr, "Usage: %s port\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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//remplissage de la structure hints contenants la configuration réseau du serveur
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memset(&hints, 0, sizeof(struct addrinfo));
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hints.ai_family = AF_INET6; // utilisation du serveur sur IPv6 (AF_UNSPEC pour IPv4/6)
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hints.ai_socktype = SOCK_DGRAM; // socket en mode datagramme
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s = getaddrinfo(NULL, argv[1], &hints, &result);
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if (s != 0) {
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fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
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exit(EXIT_FAILURE);
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}
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/* getaddrinfo () retourne une liste de structures d'adresses.
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Essayez chaque adresse jusqu'à ce que nous ayons réussi à bind(2).
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Si socket() (ou bind()) échoue, nous (fermons le socket et)
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essayons l'adresse suivante */
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for (rp = result; rp != NULL; rp = rp->ai_next) {
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sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
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if (sfd == -1){
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continue;
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}
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if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == 0){
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break; /* Succès */
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}
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close(sfd);
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}
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if (rp == NULL) { /* Aucune adresse n'a pu marcher */
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fprintf(stderr, "Could not bind\n");
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exit(EXIT_FAILURE);
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}
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freeaddrinfo(result); /* libère le buffer */
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/* Lit les datagrammes et les renvois au client */
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for (;;) {
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peer_addr_len = sizeof(struct sockaddr_storage);
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nread = recvfrom(sfd, buf, BUF_SIZE, 0, (struct sockaddr *) &peer_addr, &peer_addr_len);
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if (nread == -1){
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continue; /* ignore la mauvaise requete */
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}
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char host[NI_MAXHOST], service[NI_MAXSERV];
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s = getnameinfo((struct sockaddr *) &peer_addr, peer_addr_len, host, NI_MAXHOST, service, NI_MAXSERV, NI_NUMERICSERV);
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if (s == 0){
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printf("Recu %ld octets de %s:%s\n", (long) nread, host, service);
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}
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else{
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fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
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}
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if (sendto(sfd, buf, nread, 0, (struct sockaddr *) &peer_addr, peer_addr_len) != nread){
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fprintf(stderr, "Erreur d'envoi de la reponse\n");
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}
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}
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}
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