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214 lines
6.7 KiB
C
214 lines
6.7 KiB
C
/* PLEASE NOTE *
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* This file demonstrates how to use Avahi's core API, this is
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* the embeddable mDNS stack for embedded applications.
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*
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* End user applications should *not* use this API and should use
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* the D-Bus or C APIs, please see
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* client-browse-services.c and glib-integration.c
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*
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* I repeat, you probably do *not* want to use this example.
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*/
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/***
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This file is part of avahi.
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avahi is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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avahi is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
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or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
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Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with avahi; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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USA.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <stdio.h>
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#include <assert.h>
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#include <stdlib.h>
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#include <time.h>
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#include <avahi-core/core.h>
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#include <avahi-core/lookup.h>
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#include <avahi-common/simple-watch.h>
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#include <avahi-common/malloc.h>
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#include <avahi-common/error.h>
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static AvahiSimplePoll *simple_poll = NULL;
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static AvahiServer *server = NULL;
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static void resolve_callback(
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AvahiSServiceResolver *r,
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AVAHI_GCC_UNUSED AvahiIfIndex interface,
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AVAHI_GCC_UNUSED AvahiProtocol protocol,
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AvahiResolverEvent event,
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const char *name,
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const char *type,
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const char *domain,
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const char *host_name,
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const AvahiAddress *address,
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uint16_t port,
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AvahiStringList *txt,
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AvahiLookupResultFlags flags,
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AVAHI_GCC_UNUSED void* userdata) {
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assert(r);
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/* Called whenever a service has been resolved successfully or timed out */
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switch (event) {
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case AVAHI_RESOLVER_FAILURE:
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fprintf(stderr, "(Resolver) Failed to resolve service '%s' of type '%s' in domain '%s': %s\n", name, type, domain, avahi_strerror(avahi_server_errno(server)));
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break;
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case AVAHI_RESOLVER_FOUND: {
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char a[AVAHI_ADDRESS_STR_MAX], *t;
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fprintf(stderr, "(Resolver) Service '%s' of type '%s' in domain '%s':\n", name, type, domain);
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avahi_address_snprint(a, sizeof(a), address);
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t = avahi_string_list_to_string(txt);
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fprintf(stderr,
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"\t%s:%u (%s)\n"
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"\tTXT=%s\n"
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"\tcookie is %u\n"
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"\tis_local: %i\n"
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"\twide_area: %i\n"
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"\tmulticast: %i\n"
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"\tcached: %i\n",
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host_name, port, a,
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t,
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avahi_string_list_get_service_cookie(txt),
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!!(flags & AVAHI_LOOKUP_RESULT_LOCAL),
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!!(flags & AVAHI_LOOKUP_RESULT_WIDE_AREA),
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!!(flags & AVAHI_LOOKUP_RESULT_MULTICAST),
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!!(flags & AVAHI_LOOKUP_RESULT_CACHED));
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avahi_free(t);
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}
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}
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avahi_s_service_resolver_free(r);
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}
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static void browse_callback(
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AvahiSServiceBrowser *b,
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AvahiIfIndex interface,
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AvahiProtocol protocol,
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AvahiBrowserEvent event,
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const char *name,
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const char *type,
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const char *domain,
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AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
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void* userdata) {
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AvahiServer *s = userdata;
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assert(b);
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/* Called whenever a new services becomes available on the LAN or is removed from the LAN */
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switch (event) {
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case AVAHI_BROWSER_FAILURE:
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fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server)));
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avahi_simple_poll_quit(simple_poll);
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return;
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case AVAHI_BROWSER_NEW:
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fprintf(stderr, "(Browser) NEW: service '%s' of type '%s' in domain '%s'\n", name, type, domain);
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/* We ignore the returned resolver object. In the callback
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function we free it. If the server is terminated before
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the callback function is called the server will free
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the resolver for us. */
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if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_UNSPEC, 0, resolve_callback, s)))
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fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
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break;
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case AVAHI_BROWSER_REMOVE:
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fprintf(stderr, "(Browser) REMOVE: service '%s' of type '%s' in domain '%s'\n", name, type, domain);
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break;
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case AVAHI_BROWSER_ALL_FOR_NOW:
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case AVAHI_BROWSER_CACHE_EXHAUSTED:
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fprintf(stderr, "(Browser) %s\n", event == AVAHI_BROWSER_CACHE_EXHAUSTED ? "CACHE_EXHAUSTED" : "ALL_FOR_NOW");
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break;
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}
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}
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int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
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AvahiServerConfig config;
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AvahiSServiceBrowser *sb = NULL;
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int error;
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int ret = 1;
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/* Initialize the psuedo-RNG */
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srand(time(NULL));
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/* Allocate main loop object */
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if (!(simple_poll = avahi_simple_poll_new())) {
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fprintf(stderr, "Failed to create simple poll object.\n");
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goto fail;
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}
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/* Do not publish any local records */
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avahi_server_config_init(&config);
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config.publish_hinfo = 0;
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config.publish_addresses = 0;
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config.publish_workstation = 0;
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config.publish_domain = 0;
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/* Set a unicast DNS server for wide area DNS-SD */
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avahi_address_parse("192.168.50.1", AVAHI_PROTO_UNSPEC, &config.wide_area_servers[0]);
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config.n_wide_area_servers = 1;
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config.enable_wide_area = 1;
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/* Allocate a new server */
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server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
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/* Free the configuration data */
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avahi_server_config_free(&config);
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/* Check wether creating the server object succeeded */
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if (!server) {
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fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
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goto fail;
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}
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/* Create the service browser */
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if (!(sb = avahi_s_service_browser_new(server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, "_http._tcp", NULL, 0, browse_callback, server))) {
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fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
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goto fail;
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}
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/* Run the main loop */
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avahi_simple_poll_loop(simple_poll);
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ret = 0;
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fail:
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/* Cleanup things */
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if (sb)
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avahi_s_service_browser_free(sb);
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if (server)
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avahi_server_free(server);
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if (simple_poll)
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avahi_simple_poll_free(simple_poll);
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return ret;
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}
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