Comment servir des pintes de Guinness "over Internet" ;)
Reprise/Fork d'un très ancien code d'un pilier de f.m.b.l : http://tnemeth.free.fr/projets/guinness-server.html
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297 lines
7.4 KiB
297 lines
7.4 KiB
/*
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* tools
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* Creation et manipulation de sockets
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* Thomas Nemeth -- le 15 juin 2001
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*
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*/
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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 <errno.h>
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#include <signal.h>
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#include <netdb.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <netinet/in.h>
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#include <string.h>
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#include <strings.h>
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#include <arpa/inet.h>
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#include "defines.h"
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#include "xmem.h"
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#include "tools.h"
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/*
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* Ouverture d'une socket de type flot de donnees
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*
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* creation d'une socket serveur : port != 0
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*
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*/
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int ouvre_socket (int port, char *adr_ip, struct sockaddr_in *ptr_adresse) {
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int desc_soc;
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int lg_adresse = sizeof (struct sockaddr_in);
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int lg_linger = sizeof (struct linger);
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struct sockaddr_in adresse;
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struct linger ling;
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/*
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* Creation de la socket
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*
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*/
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if ( (desc_soc = socket (AF_INET, SOCK_STREAM, 0) ) == -1) {
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#ifdef DEBUG
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fprintf (stderr, "Ne peut pas ouvrir la socket de connexion.\n");
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#endif
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perror (__FILE__ " socket");
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return -1;
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}
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/*
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* Affectation des options
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*
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*/
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if (port != 0) {
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int opt = 1;
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if (setsockopt (desc_soc, SOL_SOCKET,
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SO_REUSEADDR, &opt, sizeof (int) ) == -1) {
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#ifdef DEBUG
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fprintf (stderr, "Impossible de positionner REUSEADDR.\n");
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#endif
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perror (__FILE__ " setsockopt -- REUSEADDR");
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return -1;
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}
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}
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ling.l_onoff = 0;
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ling.l_linger = 0;
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if (setsockopt (desc_soc, SOL_SOCKET, SO_LINGER, &ling, lg_linger) == -1) {
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#ifdef DEBUG
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fprintf (stderr, "Impossible de positionner LINGER.\n");
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#endif
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perror (__FILE__ " setsockopt -- LINGER");
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return -1;
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}
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/*
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* Preparation de l'adresse d'attachement
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*
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*/
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memset (&adresse, 0, sizeof (adresse) );
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adresse.sin_family = AF_INET;
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if (adr_ip) {
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struct in_addr ia;
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if (inet_aton(adr_ip, &ia)) {
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adresse.sin_addr = ia;
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} else {
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struct hostent *h;
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h = gethostbyname(adr_ip);
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if (!h) {
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fprintf (stderr, "Adresse %s inconnue.\n", adr_ip);
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return -1;
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}
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memcpy (&adresse.sin_addr.s_addr, h->h_addr, h->h_length);
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}
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} else
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adresse.sin_addr.s_addr = htonl (INADDR_ANY);
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adresse.sin_port = htons (port);
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/*
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* Demande d'attachement de la socket
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*
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*/
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if (bind (desc_soc, (struct sockaddr*) &adresse, lg_adresse) == -1) {
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#ifdef DEBUG
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fprintf (stderr,
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"Ne peut donner de nom a la socket de connexion.\n"
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"Attendez quelques minutes avant de relancer.\n");
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#endif
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perror (__FILE__ " bind");
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close (desc_soc);
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return -1;
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}
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/*
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* Recuperation de l'adresse effective d'attachement
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*
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*/
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if (ptr_adresse != NULL)
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getsockname (desc_soc, (struct sockaddr *) ptr_adresse, &lg_adresse);
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return desc_soc;
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}
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int connect_server (const char *machine, int port) {
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struct hostent *serveur;
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struct sockaddr_in adresse_serveur, adresse_client;
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int socket_client;
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/* Recherche de la machine ou se trouve le serveur */
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if ( (serveur = gethostbyname (machine) ) == NULL) {
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#ifdef DEBUG
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fprintf (stderr, "Machine %s inconnue...\n", machine);
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#endif
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return -1;
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}
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/* Creation et attachement de la socket du client --
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* port quelconque => 0
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*/
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if ( (socket_client = ouvre_socket
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(0, NULL, (struct sockaddr_in *) &adresse_client)) == -1) {
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#ifdef DEBUG
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fprintf (stderr, "Creation de la socket du client impossible.\n");
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#endif
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return -1;
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}
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/* Preparation de l'adresse du serveur */
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adresse_serveur.sin_family = AF_INET;
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adresse_serveur.sin_port = htons (port);
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memcpy (&adresse_serveur.sin_addr.s_addr,
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serveur->h_addr, serveur->h_length);
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/* Demande de connexion au serveur */
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if (connect (socket_client, (struct sockaddr *) &adresse_serveur,
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sizeof (adresse_serveur) ) == -1) {
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#ifdef DEBUG
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fprintf (stderr, "Impossible de se connecter au serveur.\n");
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#endif
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perror (__FILE__ " connect");
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return -1;
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}
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return socket_client;
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}
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int install_server (int port, char *adr_ip, struct sockaddr_in *ecoute) {
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int socket_ecoute;
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/* Ouverture de la socket */
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if ( (socket_ecoute = ouvre_socket (port, adr_ip, ecoute)) == -1) {
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#ifdef DEBUG
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fprintf (stderr, "Creation de la socket du serveur impossible.\n");
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#endif
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return -1;
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}
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/* Declaration d'ouverture du service */
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if (listen (socket_ecoute, 10) == -1) {
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#ifdef DEBUG
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fprintf (stderr, "Impossible d'enregistrer le service.\n");
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#endif
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perror (__FILE__ " listen");
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return -1;
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}
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return socket_ecoute;
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}
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/*
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* Fonction de reception de donnees
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*
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*/
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int read_infos (int socket_data, char *infos) {
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int nb;
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/* SSIZE_MAX = 2147483647 */
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memset (infos, 0, MAXSTRLEN);
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nb = read (socket_data, infos, MAXSTRLEN - 1);
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if ( (nb == -1) || (nb == 0) ) {
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#ifdef DEBUG
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fprintf (stderr, "Erreur de connexion reception !\n");
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#endif
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if ( (errno == EPIPE) || (nb == 0) ) return FALSE; /* cont = FALSE; */
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}
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#ifdef DEBUG
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printf ("Recu : [%s] lg = %d/%d\n", infos, strlen (infos), nb);
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#endif
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return TRUE;
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}
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/*
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* Fonction d'emisson de donnees
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*
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*/
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int send_infos (int socket_data, const char *infos) {
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#ifdef DEBUG
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printf ("Emission de : %s [%d]\n", infos, strlen (infos));
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#endif
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if (write (socket_data, (void *) infos, strlen (infos) + 1) == -1) {
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/* Erreur : plus de socket ! */
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#ifdef DEBUG
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fprintf (stderr, "Erreur de connexion emission !\n");
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#endif
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if (errno == EPIPE) return FALSE; /*cont = FALSE;*/
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}
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#ifdef DEBUG
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fprintf (stderr, "Emission ok !\n");
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#endif
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return TRUE;
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}
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void get_sock_infos (int sock, char **nom, char **adr, int *prl, int *prd) {
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struct sockaddr_in name;
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#ifdef OpenBSD
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int namelen;
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#else
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socklen_t namelen;
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#endif
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struct hostent *machine;
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/* Initialisations en cas d'echecs */
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*nom = NULL;
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*adr = NULL;
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*prd = 0;
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/* Infos locales (port) */
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namelen = sizeof (name);
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if (getsockname (sock, (struct sockaddr *) &name, &namelen) == 0)
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*prl = ntohs (name.sin_port);
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else {
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perror ("getsockname() ");
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*prl = 0;
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}
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/* Port et adresse IP distants */
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namelen = sizeof (name);
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if (getpeername (sock, (struct sockaddr *) &name, &namelen) != 0) {
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#ifdef DEBUG
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perror ("Erreur de recuperation d'information sur pair !\n"
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"getpeername() ");
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#else
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perror ("Impossible d'obtenir les infos distantes ");
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#endif
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return;
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}
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*adr = xstrdup (inet_ntoa (name.sin_addr));
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*prd = ntohs (name.sin_port);
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/* Nom de machine distante */
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machine = gethostbyaddr ((char *)&name.sin_addr,
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sizeof name.sin_addr, name.sin_family);
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if (machine == NULL) {
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#ifdef DEBUG
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perror ("Erreur de recuperation de nom de pair.\n"
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"gethostbyaddr() ");
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fprintf (stderr, "Adresse : %s (%s)\tFamille : %d (2 == AF_INET)\n",
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*adr, (char *)&name.sin_addr, name.sin_family);
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#else
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perror ("Impossible d'obtenir le nom d'hote distant ");
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#endif
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return;
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}
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*nom = xstrdup (machine->h_name);
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}
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