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
33struct AvahiSServiceBrowser {
34    AvahiServer *server;
35    char *domain_name;
36    char *service_type;
37
38    AvahiSRecordBrowser *record_browser;
39
40    AvahiSServiceBrowserCallback callback;
41    void* userdata;
42
43    AVAHI_LLIST_FIELDS(AvahiSServiceBrowser, browser);
44};
45
46static void record_browser_callback(
47    AvahiSRecordBrowser*rr,
48    AvahiIfIndex interface,
49    AvahiProtocol protocol,
50    AvahiBrowserEvent event,
51    AvahiRecord *record,
52    AvahiLookupResultFlags flags,
53    void* userdata) {
54
55    AvahiSServiceBrowser *b = userdata;
56
57    assert(rr);
58    assert(b);
59
60    /* Filter flags */
61    flags &= AVAHI_LOOKUP_RESULT_CACHED | AVAHI_LOOKUP_RESULT_MULTICAST | AVAHI_LOOKUP_RESULT_WIDE_AREA;
62
63    if (record) {
64        char service[AVAHI_LABEL_MAX], type[AVAHI_DOMAIN_NAME_MAX], domain[AVAHI_DOMAIN_NAME_MAX];
65
66        assert(record->key->type == AVAHI_DNS_TYPE_PTR);
67
68        if (event == AVAHI_BROWSER_NEW && avahi_server_is_service_local(b->server, interface, protocol, record->data.ptr.name))
69            flags |= AVAHI_LOOKUP_RESULT_LOCAL;
70
71        if (avahi_service_name_split(record->data.ptr.name, service, sizeof(service), type, sizeof(type), domain, sizeof(domain)) < 0) {
72            avahi_log_warn("Failed to split '%s'", record->key->name);
73            return;
74        }
75
76        b->callback(b, interface, protocol, event, service, type, domain, flags, b->userdata);
77
78    } else
79        b->callback(b, interface, protocol, event, NULL, b->service_type, b->domain_name, flags, b->userdata);
80
81}
82
83AvahiSServiceBrowser *avahi_s_service_browser_new(
84    AvahiServer *server,
85    AvahiIfIndex interface,
86    AvahiProtocol protocol,
87    const char *service_type,
88    const char *domain,
89    AvahiLookupFlags flags,
90    AvahiSServiceBrowserCallback callback,
91    void* userdata) {
92
93    AvahiSServiceBrowser *b;
94    AvahiKey *k = NULL;
95    char n[AVAHI_DOMAIN_NAME_MAX];
96    int r;
97
98    assert(server);
99    assert(callback);
100    assert(service_type);
101
102    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE);
103    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL);
104    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME);
105    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
106    AVAHI_CHECK_VALIDITY_RETURN_NULL(server, avahi_is_valid_service_type_generic(service_type), AVAHI_ERR_INVALID_SERVICE_TYPE);
107
108    if (!domain)
109        domain = server->domain_name;
110
111    if ((r = avahi_service_name_join(n, sizeof(n), NULL, service_type, domain)) < 0) {
112        avahi_server_set_errno(server, r);
113        return NULL;
114    }
115
116    if (!(b = avahi_new(AvahiSServiceBrowser, 1))) {
117        avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
118        return NULL;
119    }
120
121    b->server = server;
122    b->domain_name = b->service_type = NULL;
123    b->callback = callback;
124    b->userdata = userdata;
125    b->record_browser = NULL;
126
127    AVAHI_LLIST_PREPEND(AvahiSServiceBrowser, browser, server->service_browsers, b);
128
129    if (!(b->domain_name = avahi_normalize_name_strdup(domain)) ||
130        !(b->service_type = avahi_normalize_name_strdup(service_type))) {
131        avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
132        goto fail;
133    }
134
135    if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR))) {
136        avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
137        goto fail;
138    }
139
140    if (!(b->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, b)))
141        goto fail;
142
143    avahi_key_unref(k);
144
145    return b;
146
147fail:
148
149    if (k)
150        avahi_key_unref(k);
151
152    avahi_s_service_browser_free(b);
153    return NULL;
154}
155
156void avahi_s_service_browser_free(AvahiSServiceBrowser *b) {
157    assert(b);
158
159    AVAHI_LLIST_REMOVE(AvahiSServiceBrowser, browser, b->server->service_browsers, b);
160
161    if (b->record_browser)
162        avahi_s_record_browser_free(b->record_browser);
163
164    avahi_free(b->domain_name);
165    avahi_free(b->service_type);
166    avahi_free(b);
167}
168