You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
#include <sys/types.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <unistd.h>
|
|
#include <string.h>
|
|
#include <sys/socket.h>
|
|
#include <netdb.h>
|
|
|
|
#define BUF_SIZE 500
|
|
|
|
struct addrinfo *result; // tableau des adresses réseaux des clients
|
|
|
|
// affiche_adresse_socket, serveur et traite_connexion
|
|
|
|
int cree_socket(struct addrinfo hints, char* ip){
|
|
//remplissage de la structure hints contenants la configuration réseau du serveur
|
|
memset(&hints, 0, sizeof(struct addrinfo));
|
|
|
|
int s = getaddrinfo(NULL, ip, &hints, &result);
|
|
if (s != 0) {
|
|
fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(s));
|
|
s = 1;
|
|
}
|
|
return s;
|
|
}
|
|
|
|
int main(int argc, char *argv[]){
|
|
struct addrinfo hints;
|
|
struct addrinfo *rp;
|
|
int sfd, s; // s code de retour de getaddrinfo
|
|
struct sockaddr_storage peer_addr;
|
|
socklen_t peer_addr_len;
|
|
ssize_t nread;
|
|
char buf[BUF_SIZE];
|
|
|
|
if (argc != 2) { // test du nombre d'arguments entrés
|
|
fprintf(stderr, "Usage: %s port\n", argv[0]);
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
char* ip = argv[1];
|
|
|
|
// remploissage de la structure config réseau serveur
|
|
hints.ai_family = AF_INET6; // utilisation du serveur sur IPv6 (AF_UNSPEC pour IPv4/6)
|
|
hints.ai_socktype = SOCK_DGRAM; // socket en mode datagramme
|
|
|
|
s = cree_socket(hints, ip); // création du socket
|
|
if(s == 1) {
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
|
|
|
|
|
|
/* getaddrinfo () retourne une liste de structures d'adresses.
|
|
Essayez chaque adresse jusqu'à ce que nous ayons réussi à bind(2).
|
|
Si socket() (ou bind()) échoue, nous (fermons le socket et)
|
|
essayons l'adresse suivante */
|
|
|
|
for (rp = result; rp != NULL; rp = rp->ai_next) {
|
|
sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
|
|
if (sfd == -1){
|
|
continue;
|
|
}
|
|
|
|
if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == 0){
|
|
break; // Succès
|
|
}
|
|
|
|
close(sfd);
|
|
}
|
|
|
|
if (rp == NULL) { // Aucune adresse n'a pu marcher
|
|
fprintf(stderr, "Could not bind\n");
|
|
exit(EXIT_FAILURE);
|
|
}
|
|
|
|
freeaddrinfo(result); // libère
|
|
|
|
// Lit les datagrammes et les renvois au client
|
|
|
|
for (;;) {
|
|
peer_addr_len = sizeof(struct sockaddr_storage);
|
|
nread = recvfrom(sfd, buf, BUF_SIZE, 0, (struct sockaddr *) &peer_addr, &peer_addr_len);
|
|
if (nread == -1){
|
|
continue; /* ignore la mauvaise requete */
|
|
}
|
|
|
|
char host[NI_MAXHOST], service[NI_MAXSERV];
|
|
|
|
s = getnameinfo((struct sockaddr *) &peer_addr, peer_addr_len, host, NI_MAXHOST, service, NI_MAXSERV, NI_NUMERICSERV);
|
|
if (s == 0){
|
|
printf("Recu %ld octets de %s:%s\n", (long) nread, host, service);
|
|
}
|
|
else{
|
|
fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
|
|
}
|
|
|
|
if (sendto(sfd, buf, nread, 0, (struct sockaddr *) &peer_addr, peer_addr_len) != nread){
|
|
fprintf(stderr, "Erreur d'envoi de la reponse\n");
|
|
}
|
|
}
|
|
}
|