traduction du programme serveur

serveur_echo.c

@@ -8,9 +8,7 @@
 
 #define BUF_SIZE 500
 
-int
+int main(int argc, char *argv[]){
-main(int argc, char *argv[])
-{
   struct addrinfo hints;
   struct addrinfo *result, *rp;
   int sfd, s;
@@ -24,14 +22,10 @@ main(int argc, char *argv[])
     exit(EXIT_FAILURE);
   }
 
+  //remplissage de la structure hints contenants la configuration réseau du serveur
   memset(&hints, 0, sizeof(struct addrinfo));
-    hints.ai_family = AF_UNSPEC;    /* Allow IPv4 or IPv6 */
+  hints.ai_family = AF_INET6;    // utilisation du serveur sur IPv6 (AF_UNSPEC pour IPv4/6)
-    hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
+  hints.ai_socktype = SOCK_DGRAM; // socket en mode datagramme
-    hints.ai_flags = AI_PASSIVE;    /* For wildcard IP address */
-    hints.ai_protocol = 0;          /* Any protocol */
-    hints.ai_canonname = NULL;
-    hints.ai_addr = NULL;
-    hints.ai_next = NULL;
 
   s = getaddrinfo(NULL, argv[1], &hints, &result);
   if (s != 0) {
@@ -39,53 +33,52 @@ main(int argc, char *argv[])
     exit(EXIT_FAILURE);
   }
 
-    /* getaddrinfo() returns a list of address structures.
+  /* getaddrinfo () retourne une liste de structures d'adresses.
-       Try each address until we successfully bind(2).
+     Essayez chaque adresse jusqu'à ce que nous ayons réussi à bind(2).
-       If socket() (or bind()) fails, we (close the socket
+     Si socket() (ou bind()) échoue, nous (fermons le socket et)
-       and) try the next address. */
+     essayons l'adresse suivante */
 
   for (rp = result; rp != NULL; rp = rp->ai_next) {
-        sfd = socket(rp->ai_family, rp->ai_socktype,
+    sfd = socket(rp->ai_family, rp->ai_socktype, rp->ai_protocol);
-                rp->ai_protocol);
+    if (sfd == -1){
-        if (sfd == -1)
       continue;
+    }
 
-        if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == 0)
+    if (bind(sfd, rp->ai_addr, rp->ai_addrlen) == 0){
-            break;                  /* Success */
+      break;                             /* Succès */
+    }
 
     close(sfd);
   }
 
-    if (rp == NULL) {               /* No address succeeded */
+  if (rp == NULL) {                      /* Aucune adresse n'a pu marcher */
     fprintf(stderr, "Could not bind\n");
     exit(EXIT_FAILURE);
   }
 
-    freeaddrinfo(result);           /* No longer needed */
+  freeaddrinfo(result);                  /* libère le buffer */
 
-    /* Read datagrams and echo them back to sender */
+  /* Lit les datagrammes et les renvois au client */
 
   for (;;) {
     peer_addr_len = sizeof(struct sockaddr_storage);
-        nread = recvfrom(sfd, buf, BUF_SIZE, 0,
+    nread = recvfrom(sfd, buf, BUF_SIZE, 0, (struct sockaddr *) &peer_addr, &peer_addr_len);
-                (struct sockaddr *) &peer_addr, &peer_addr_len);
+    if (nread == -1){
-        if (nread == -1)
+      continue;                          /* ignore la mauvaise requete */
-            continue;               /* Ignore failed request */
+    }
 
     char host[NI_MAXHOST], service[NI_MAXSERV];
 
-        s = getnameinfo((struct sockaddr *) &peer_addr,
+    s = getnameinfo((struct sockaddr *) &peer_addr, peer_addr_len, host, NI_MAXHOST, service, NI_MAXSERV, NI_NUMERICSERV);
-                        peer_addr_len, host, NI_MAXHOST,
+    if (s == 0){
-                        service, NI_MAXSERV, NI_NUMERICSERV);
+      printf("Recu %ld octets de %s:%s\n", (long) nread, host, service);
-       if (s == 0)
+    }
-            printf("Received %ld bytes from %s:%s\n",
+    else{
-                    (long) nread, host, service);
-        else
       fprintf(stderr, "getnameinfo: %s\n", gai_strerror(s));
+    }
 
-        if (sendto(sfd, buf, nread, 0,
+    if (sendto(sfd, buf, nread, 0, (struct sockaddr *) &peer_addr, peer_addr_len) != nread){
-                    (struct sockaddr *) &peer_addr,
+      fprintf(stderr, "Erreur d'envoi de la reponse\n");
-                    peer_addr_len) != nread)
+    }
-            fprintf(stderr, "Error sending response\n");
   }
 }