1/*** 2 This file is part of avahi. 3 4 avahi is free software; you can redistribute it and/or modify it 5 under the terms of the GNU Lesser General Public License as 6 published by the Free Software Foundation; either version 2.1 of the 7 License, or (at your option) any later version. 8 9 avahi is distributed in the hope that it will be useful, but WITHOUT 10 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY 11 or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General 12 Public License for more details. 13 14 You should have received a copy of the GNU Lesser General Public 15 License along with avahi; if not, write to the Free Software 16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 17 USA. 18***/ 19 20#ifdef HAVE_CONFIG_H 21#include <config.h> 22#endif 23 24#include <string.h> 25 26#include <avahi-common/domain.h> 27#include <avahi-common/malloc.h> 28#include <avahi-common/error.h> 29 30#include "browse.h" 31#include "log.h" 32 33struct AvahiSServiceTypeBrowser { 34 AvahiServer *server; 35 char *domain_name; 36 37 AvahiSRecordBrowser *record_browser; 38 39 AvahiSServiceTypeBrowserCallback callback; 40 void* userdata; 41 42 AVAHI_LLIST_FIELDS(AvahiSServiceTypeBrowser, browser); 43}; 44 45static void record_browser_callback( 46 AvahiSRecordBrowser*rr, 47 AvahiIfIndex interface, 48 AvahiProtocol protocol, 49 AvahiBrowserEvent event, 50 AvahiRecord *record, 51 AvahiLookupResultFlags flags, 52 void* userdata) { 53 54 AvahiSServiceTypeBrowser *b = userdata; 55 56 assert(rr); 57 assert(b); 58 59 /* Filter flags */ 60 flags &= AVAHI_LOOKUP_RESULT_CACHED | AVAHI_LOOKUP_RESULT_MULTICAST | AVAHI_LOOKUP_RESULT_WIDE_AREA; 61 62 if (record) { 63 char type[AVAHI_DOMAIN_NAME_MAX], domain[AVAHI_DOMAIN_NAME_MAX]; 64 65 assert(record->key->type == AVAHI_DNS_TYPE_PTR); 66 67 if (avahi_service_name_split(record->data.ptr.name, NULL, 0, type, sizeof(type), domain, sizeof(domain)) < 0) { 68 avahi_log_warn("Invalid service type '%s'", record->key->name); 69 return; 70 } 71 72 b->callback(b, interface, protocol, event, type, domain, flags, b->userdata); 73 } else 74 b->callback(b, interface, protocol, event, NULL, b->domain_name, flags, b->userdata); 75} 76 77AvahiSServiceTypeBrowser *avahi_s_service_type_browser_new( 78 AvahiServer *server, 79 AvahiIfIndex interface, 80 AvahiProtocol protocol, 81 const char *domain, 82 AvahiLookupFlags flags, 83 AvahiSServiceTypeBrowserCallback callback, 84 void* userdata) { 85 86 AvahiSServiceTypeBrowser *b; 87 AvahiKey *k = NULL; 88 char n[AVAHI_DOMAIN_NAME_MAX]; 89 int r; 90 91 assert(server); 92 assert(callback); 93 94 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE); 95 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL); 96 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME); 97 AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS); 98 99 if (!domain) 100 domain = server->domain_name; 101 102 if ((r = avahi_service_name_join(n, sizeof(n), NULL, "_services._dns-sd._udp", domain)) < 0) { 103 avahi_server_set_errno(server, r); 104 return NULL; 105 } 106 107 if (!(b = avahi_new(AvahiSServiceTypeBrowser, 1))) { 108 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY); 109 return NULL; 110 } 111 112 b->server = server; 113 b->callback = callback; 114 b->userdata = userdata; 115 b->record_browser = NULL; 116 117 AVAHI_LLIST_PREPEND(AvahiSServiceTypeBrowser, browser, server->service_type_browsers, b); 118 119 if (!(b->domain_name = avahi_normalize_name_strdup(domain))) { 120 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY); 121 goto fail; 122 } 123 124 if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR))) { 125 avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY); 126 goto fail; 127 } 128 129 if (!(b->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, b))) 130 goto fail; 131 132 avahi_key_unref(k); 133 134 return b; 135 136fail: 137 if (k) 138 avahi_key_unref(k); 139 140 avahi_s_service_type_browser_free(b); 141 142 return NULL; 143} 144 145void avahi_s_service_type_browser_free(AvahiSServiceTypeBrowser *b) { 146 assert(b); 147 148 AVAHI_LLIST_REMOVE(AvahiSServiceTypeBrowser, browser, b->server->service_type_browsers, b); 149 150 if (b->record_browser) 151 avahi_s_record_browser_free(b->record_browser); 152 153 avahi_free(b->domain_name); 154 avahi_free(b); 155} 156 157 158