1/* $Id$ */ 2 3/* PLEASE NOTE * 4 * This file demonstrates how to use Avahi's core API, this is 5 * the embeddable mDNS stack for embedded applications. 6 * 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 10 * 11 * I repeat, you probably do *not* want to use this example. 12 */ 13 14/*** 15 This file is part of avahi. 16 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. 21 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. 26 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 30 USA. 31***/ 32 33#ifdef HAVE_CONFIG_H 34#include <config.h> 35#endif 36 37#include <stdio.h> 38#include <assert.h> 39#include <stdlib.h> 40#include <time.h> 41 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> 47 48static AvahiSimplePoll *simple_poll = NULL; 49static AvahiServer *server = NULL; 50 51static void resolve_callback( 52 AvahiSServiceResolver *r, 53 AVAHI_GCC_UNUSED AvahiIfIndex interface, 54 AVAHI_GCC_UNUSED AvahiProtocol protocol, 55 AvahiResolverEvent event, 56 const char *name, 57 const char *type, 58 const char *domain, 59 const char *host_name, 60 const AvahiAddress *address, 61 uint16_t port, 62 AvahiStringList *txt, 63 AvahiLookupResultFlags flags, 64 AVAHI_GCC_UNUSED void* userdata) { 65 66 assert(r); 67 68 /* Called whenever a service has been resolved successfully or timed out */ 69 70 switch (event) { 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))); 73 break; 74 75 case AVAHI_RESOLVER_FOUND: { 76 char a[AVAHI_ADDRESS_STR_MAX], *t; 77 78 fprintf(stderr, "(Resolver) Service '%s' of type '%s' in domain '%s':\n", name, type, domain); 79 80 avahi_address_snprint(a, sizeof(a), address); 81 t = avahi_string_list_to_string(txt); 82 fprintf(stderr, 83 "\t%s:%u (%s)\n" 84 "\tTXT=%s\n" 85 "\tcookie is %u\n" 86 "\tis_local: %i\n" 87 "\twide_area: %i\n" 88 "\tmulticast: %i\n" 89 "\tcached: %i\n", 90 host_name, port, a, 91 t, 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)); 97 avahi_free(t); 98 } 99 } 100 101 avahi_s_service_resolver_free(r); 102} 103 104static void browse_callback( 105 AvahiSServiceBrowser *b, 106 AvahiIfIndex interface, 107 AvahiProtocol protocol, 108 AvahiBrowserEvent event, 109 const char *name, 110 const char *type, 111 const char *domain, 112 AVAHI_GCC_UNUSED AvahiLookupResultFlags flags, 113 void* userdata) { 114 115 AvahiServer *s = userdata; 116 assert(b); 117 118 /* Called whenever a new services becomes available on the LAN or is removed from the LAN */ 119 120 switch (event) { 121 122 case AVAHI_BROWSER_FAILURE: 123 124 fprintf(stderr, "(Browser) %s\n", avahi_strerror(avahi_server_errno(server))); 125 avahi_simple_poll_quit(simple_poll); 126 return; 127 128 case AVAHI_BROWSER_NEW: 129 fprintf(stderr, "(Browser) NEW: service '%s' of type '%s' in domain '%s'\n", name, type, domain); 130 131 /* 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. */ 135 136 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))); 138 139 break; 140 141 case AVAHI_BROWSER_REMOVE: 142 fprintf(stderr, "(Browser) REMOVE: service '%s' of type '%s' in domain '%s'\n", name, type, domain); 143 break; 144 145 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"); 148 break; 149 } 150} 151 152int main(AVAHI_GCC_UNUSED int argc, AVAHI_GCC_UNUSED char*argv[]) { 153 AvahiServerConfig config; 154 AvahiSServiceBrowser *sb = NULL; 155 int error; 156 int ret = 1; 157 158 /* Initialize the psuedo-RNG */ 159 srand(time(NULL)); 160 161 /* Allocate main loop object */ 162 if (!(simple_poll = avahi_simple_poll_new())) { 163 fprintf(stderr, "Failed to create simple poll object.\n"); 164 goto fail; 165 } 166 167 /* 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; 173 174 /* 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; 178 179 /* Allocate a new server */ 180 server = avahi_server_new(avahi_simple_poll_get(simple_poll), &config, NULL, NULL, &error); 181 182 /* Free the configuration data */ 183 avahi_server_config_free(&config); 184 185 /* Check wether creating the server object succeeded */ 186 if (!server) { 187 fprintf(stderr, "Failed to create server: %s\n", avahi_strerror(error)); 188 goto fail; 189 } 190 191 /* 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))); 194 goto fail; 195 } 196 197 /* Run the main loop */ 198 avahi_simple_poll_loop(simple_poll); 199 200 ret = 0; 201 202fail: 203 204 /* Cleanup things */ 205 if (sb) 206 avahi_s_service_browser_free(sb); 207 208 if (server) 209 avahi_server_free(server); 210 211 if (simple_poll) 212 avahi_simple_poll_free(simple_poll); 213 214 return ret; 215} 216