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97 lines
2.7 KiB
C
97 lines
2.7 KiB
C
#include <sys/types.h>
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#include <sys/socket.h>
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#include <netdb.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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#define BUF_SIZE 500
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struct addrinfo *result; // tableau des adresses réseaux des serveurs
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int cree_socket(char* ip, char* port, struct addrinfo hints){
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int s = getaddrinfo(ip, port, &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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s = 1;
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}
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return s;
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}
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int main(int argc, char *argv[]) {
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struct addrinfo hints;
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struct addrinfo *rp;
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int sfd, s, j;
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size_t len;
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ssize_t nread;
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char buf[BUF_SIZE];
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if (argc < 3) { // vérification du nombre d'arguments rentrés
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fprintf(stderr, "mettre: %s ip port message\n", argv[0]);
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exit(EXIT_FAILURE);
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}
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char* ip = argv[1];
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char* port = argv[2];
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char* message = argv[3]; // remplissage des varables a partir des arguments passés au programme
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/* Obtain address(es) matching host/port */
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memset(&hints, 0, sizeof(struct addrinfo));
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hints.ai_family = AF_UNSPEC; /* Allow IPv4 or IPv6 */
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hints.ai_socktype = SOCK_DGRAM; /* Datagram socket */
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hints.ai_flags = 0;
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hints.ai_protocol = 0; /* Any protocol */
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s = cree_socket(ip, port, hints); // création du socket
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if(s == 1) {
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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 (connect(sfd, rp->ai_addr, rp->ai_addrlen) != -1){
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break; /* Success */
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}
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close(sfd);
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}
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if (rp == NULL) { /* No address succeeded */
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fprintf(stderr, "Could not connect\n");
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exit(EXIT_FAILURE);
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}
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freeaddrinfo(result); /* No longer needed */
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/* Send remaining command-line arguments as separate
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datagrams, and read responses from server */
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for (j = 3; j < argc; j++) {
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len = strlen(argv[j]) + 1;
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/* +1 for terminating null byte */
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if (len + 1 > BUF_SIZE) {
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fprintf(stderr, "Ignoring long message in argument %d\n", j);
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continue;
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}
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if (write(sfd, argv[j], len) != len) {
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fprintf(stderr, "partial/failed write\n");
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exit(EXIT_FAILURE);
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}
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nread = read(sfd, buf, BUF_SIZE);
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if (nread == -1) {
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perror("read");
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exit(EXIT_FAILURE);
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}
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printf("Received %ld bytes: %s\n", (long) nread, buf);
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}
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exit(EXIT_SUCCESS);
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}
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