4 * This file demonstrates how to use Avahi's core API, this is
5 * the embeddable mDNS stack for embedded applications.
7 * End user applications should *not* use this API and should use
8 * the D-Bus or C APIs, please see
9 * client-browse-services.c and glib-integration.c
11 * I repeat, you probably do *not* want to use this example.
15 This file is part of avahi.
17 avahi is free software; you can redistribute it and/or modify it
18 under the terms of the GNU Lesser General Public License as
19 published by the Free Software Foundation; either version 2.1 of the
20 License, or (at your option) any later version.
22 avahi is distributed in the hope that it will be useful, but WITHOUT
23 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
24 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
25 Public License for more details.
27 You should have received a copy of the GNU Lesser General Public
28 License along with avahi; if not, write to the Free Software
29 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
42 #include <avahi-core/core.h>
43 #include <avahi-core/lookup.h>
44 #include <avahi-common/simple-watch.h>
45 #include <avahi-common/malloc.h>
46 #include <avahi-common/error.h>
48 static AvahiSimplePoll *simple_poll = NULL;
49 static AvahiServer *server = NULL;
51 static void resolve_callback(
52 AvahiSServiceResolver *r,
53 AVAHI_GCC_UNUSED AvahiIfIndex interface,
54 AVAHI_GCC_UNUSED AvahiProtocol protocol,
55 AvahiResolverEvent event,
59 const char *host_name,
60 const AvahiAddress *address,
63 AvahiLookupResultFlags flags,
64 AVAHI_GCC_UNUSED void* userdata) {
68 /* Called whenever a service has been resolved successfully or timed out */
71 case AVAHI_RESOLVER_FAILURE:
72 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)));
75 case AVAHI_RESOLVER_FOUND: {
76 char a[AVAHI_ADDRESS_STR_MAX], *t;
78 fprintf(stderr, "(Resolver) Service '%s' of type '%s' in domain '%s':\n", name, type, domain);
80 avahi_address_snprint(a, sizeof(a), address);
81 t = avahi_string_list_to_string(txt);
92 avahi_string_list_get_service_cookie(txt),
93 !!(flags & AVAHI_LOOKUP_RESULT_LOCAL),
94 !!(flags & AVAHI_LOOKUP_RESULT_WIDE_AREA),
95 !!(flags & AVAHI_LOOKUP_RESULT_MULTICAST),
96 !!(flags & AVAHI_LOOKUP_RESULT_CACHED));
101 avahi_s_service_resolver_free(r);
104 static void browse_callback(
105 AvahiSServiceBrowser *b,
106 AvahiIfIndex interface,
107 AvahiProtocol protocol,
108 AvahiBrowserEvent event,
112 AVAHI_GCC_UNUSED AvahiLookupResultFlags flags,
115 AvahiServer *s = userdata;
118 /* Called whenever a new services becomes available on the LAN or is removed from the LAN */
122 case AVAHI_BROWSER_FAILURE:
124 fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server)));
125 avahi_simple_poll_quit(simple_poll);
128 case AVAHI_BROWSER_NEW:
129 fprintf(stderr, "(Browser) NEW: service '%s' of type '%s' in domain '%s'\n", name, type, domain);
131 /* We ignore the returned resolver object. In the callback
132 function we free it. If the server is terminated before
133 the callback function is called the server will free
134 the resolver for us. */
136 if (!(avahi_s_service_resolver_new(s, interface, protocol, name, type, domain, AVAHI_PROTO_UNSPEC, 0, resolve_callback, s)))
137 fprintf(stderr, "Failed to resolve service '%s': %s\n", name, avahi_strerror(avahi_server_errno(s)));
141 case AVAHI_BROWSER_REMOVE:
142 fprintf(stderr, "(Browser) REMOVE: service '%s' of type '%s' in domain '%s'\n", name, type, domain);
145 case AVAHI_BROWSER_ALL_FOR_NOW:
146 case AVAHI_BROWSER_CACHE_EXHAUSTED:
147 fprintf(stderr, "(Browser) %s\n", event == AVAHI_BROWSER_CACHE_EXHAUSTED ? "CACHE_EXHAUSTED" : "ALL_FOR_NOW");
152 int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) {
153 AvahiServerConfig config;
154 AvahiSServiceBrowser *sb = NULL;
158 /* Initialize the psuedo-RNG */
161 /* Allocate main loop object */
162 if (!(simple_poll = avahi_simple_poll_new())) {
163 fprintf(stderr, "Failed to create simple poll object.\n");
167 /* Do not publish any local records */
168 avahi_server_config_init(&config);
169 config.publish_hinfo = 0;
170 config.publish_addresses = 0;
171 config.publish_workstation = 0;
172 config.publish_domain = 0;
174 /* Set a unicast DNS server for wide area DNS-SD */
175 avahi_address_parse("192.168.50.1", AVAHI_PROTO_UNSPEC, &config.wide_area_servers[0]);
176 config.n_wide_area_servers = 1;
177 config.enable_wide_area = 1;
179 /* Allocate a new server */
180 server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error);
182 /* Free the configuration data */
183 avahi_server_config_free(&config);
185 /* Check wether creating the server object succeeded */
187 fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error));
191 /* Create the service browser */
192 if (!(sb = avahi_s_service_browser_new(server, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, "_http._tcp", NULL, 0, browse_callback, server))) {
193 fprintf(stderr, "Failed to create service browser: %s\n", avahi_strerror(avahi_server_errno(server)));
197 /* Run the main loop */
198 avahi_simple_poll_loop(simple_poll);
206 avahi_s_service_browser_free(sb);
209 avahi_server_free(server);
212 avahi_simple_poll_free(simple_poll);