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      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/avahi-malloc.h"
     28 #include <avahi-common/error.h>
     29 
     30 #include "browse.h"
     31 #include "log.h"
     32 
     33 struct 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 
     45 static 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 
     77 AvahiSServiceTypeBrowser *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 
    136 fail:
    137     if (k)
    138         avahi_key_unref(k);
    139 
    140     avahi_s_service_type_browser_free(b);
    141 
    142     return NULL;
    143 }
    144 
    145 void 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