-/* $Id$ */
-
/***
This file is part of avahi.
-
+
avahi is free software; you can redistribute it and/or modify it
under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation; either version 2.1 of the
License, or (at your option) any later version.
-
+
avahi is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
Public License for more details.
-
+
You should have received a copy of the GNU Lesser General Public
License along with avahi; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
struct AvahiSRBLookup {
AvahiSRecordBrowser *record_browser;
-
+
unsigned ref;
AvahiIfIndex interface;
AvahiProtocol protocol;
AvahiLookupFlags flags;
-
+
AvahiKey *key;
AvahiWideAreaLookup *wide_area;
AvahiMulticastLookup *multicast;
AvahiRList *cname_lookups;
-
+
AVAHI_LLIST_FIELDS(AvahiSRBLookup, lookups);
};
AvahiKey *key) {
AvahiSRBLookup *l;
-
+
assert(b);
assert(AVAHI_IF_VALID(interface));
assert(AVAHI_PROTO_VALID(protocol));
if (b->n_lookups >= AVAHI_LOOKUPS_PER_BROWSER_MAX)
/* We don't like cyclic CNAMEs */
return NULL;
-
+
if (!(l = avahi_new(AvahiSRBLookup, 1)))
return NULL;
-
+
l->ref = 1;
l->record_browser = b;
l->interface = interface;
l->flags = flags;
transport_flags_from_domain(b->server, &l->flags, key->name);
-
+
AVAHI_LLIST_PREPEND(AvahiSRBLookup, lookups, b->lookups, l);
b->n_lookups ++;
-
+
return l;
}
avahi_wide_area_lookup_free(l->wide_area);
l->wide_area = NULL;
}
-
+
if (l->multicast) {
avahi_multicast_lookup_free(l->multicast);
l->multicast = NULL;
lookup_unref(l->cname_lookups->data);
l->cname_lookups = avahi_rlist_remove_by_link(l->cname_lookups, l->cname_lookups);
}
-
+
avahi_key_unref(l->key);
avahi_free(l);
}
AvahiProtocol protocol,
AvahiLookupFlags flags,
AvahiKey *key) {
-
+
AvahiSRBLookup *l;
-
+
assert(b);
for (l = b->lookups; l; l = l->lookups_next) {
}
}
-
static void lookup_wide_area_callback(
AvahiWideAreaLookupEngine *e,
AvahiBrowserEvent event,
AvahiLookupResultFlags flags,
AvahiRecord *r,
void *userdata) {
-
+
AvahiSRBLookup *l = userdata;
AvahiSRecordBrowser *b;
assert(e);
assert(l);
+ assert(l->ref >= 1);
b = l->record_browser;
return;
lookup_ref(l);
-
+
switch (event) {
case AVAHI_BROWSER_NEW:
assert(r);
-
+
if (r->key->clazz == AVAHI_DNS_CLASS_IN &&
r->key->type == AVAHI_DNS_TYPE_CNAME)
/* It's a CNAME record, so let's follow it. We only follow it on wide area DNS! */
AvahiSRBLookup *l = userdata;
AvahiSRecordBrowser *b;
-
+
assert(e);
assert(l);
return;
lookup_ref(l);
-
+
switch (event) {
case AVAHI_BROWSER_NEW:
assert(r);
-
+
if (r->key->clazz == AVAHI_DNS_CLASS_IN &&
r->key->type == AVAHI_DNS_TYPE_CNAME)
/* It's a CNAME record, so let's follow it. We allow browsing on both multicast and wide area. */
if (avahi_server_is_record_local(b->server, interface, protocol, r))
flags |= AVAHI_LOOKUP_RESULT_LOCAL;
-
+
b->callback(b, interface, protocol, event, r, flags, b->userdata);
}
break;
assert(!(l->flags & AVAHI_LOOKUP_USE_WIDE_AREA) != !(l->flags & AVAHI_LOOKUP_USE_MULTICAST));
assert(!l->wide_area && !l->multicast);
-
+
if (l->flags & AVAHI_LOOKUP_USE_WIDE_AREA) {
if (!(l->wide_area = avahi_wide_area_lookup_new(l->record_browser->server->wide_area_lookup_engine, l->key, lookup_wide_area_callback, l)))
return -1;
-
+
} else {
assert(l->flags & AVAHI_LOOKUP_USE_MULTICAST);
static int lookup_scan_cache(AvahiSRBLookup *l) {
int n = 0;
-
+
assert(l);
assert(!(l->flags & AVAHI_LOOKUP_USE_WIDE_AREA) != !(l->flags & AVAHI_LOOKUP_USE_MULTICAST));
-
+
if (l->flags & AVAHI_LOOKUP_USE_WIDE_AREA) {
n = (int) avahi_wide_area_scan_cache(l->record_browser->server->wide_area_lookup_engine, l->key, lookup_wide_area_callback, l);
-
+
} else {
assert(l->flags & AVAHI_LOOKUP_USE_MULTICAST);
n = (int) avahi_multicast_lookup_engine_scan_cache(l->record_browser->server->multicast_lookup_engine, l->interface, l->protocol, l->key, lookup_multicast_callback, l);
static AvahiSRBLookup* lookup_add(AvahiSRecordBrowser *b, AvahiIfIndex interface, AvahiProtocol protocol, AvahiLookupFlags flags, AvahiKey *key) {
AvahiSRBLookup *l;
-
+
assert(b);
assert(!b->dead);
if (l->record_browser->dead)
return 0;
-
+
lookup_ref(l);
-
+
/* Browse the cache for the root request */
n = lookup_scan_cache(l);
if ((l->flags & AVAHI_LOOKUP_USE_MULTICAST) || n == 0)
/* We do no start a query if the cache contained entries and we're on wide area */
-
+
if (lookup_start(l) < 0)
n = -1;
}
static void lookup_handle_cname(AvahiSRBLookup *l, AvahiIfIndex interface, AvahiProtocol protocol, AvahiLookupFlags flags, AvahiRecord *r) {
AvahiKey *k;
AvahiSRBLookup *n;
-
+
assert(l);
assert(r);
assert(r->key->type == AVAHI_DNS_TYPE_CNAME);
k = avahi_key_new(r->data.ptr.name, l->record_browser->key->clazz, l->record_browser->key->type);
- n = lookup_add(l->record_browser, interface, protocol, flags, k);
+ n = lookup_add(l->record_browser, interface, protocol, flags, k);
avahi_key_unref(k);
if (!n) {
l->cname_lookups = avahi_rlist_prepend(l->cname_lookups, lookup_ref(n));
lookup_go(n);
+ lookup_unref(n);
}
static void lookup_drop_cname(AvahiSRBLookup *l, AvahiIfIndex interface, AvahiProtocol protocol, AvahiLookupFlags flags, AvahiRecord *r) {
avahi_key_equal(n->key, k))
break;
}
-
+
avahi_key_unref(k);
if (rl) {
b, b->interface, b->protocol, AVAHI_BROWSER_FAILURE, NULL,
b->flags & AVAHI_LOOKUP_USE_WIDE_AREA ? AVAHI_LOOKUP_RESULT_WIDE_AREA : AVAHI_LOOKUP_RESULT_MULTICAST,
b->userdata);
-
+
browser_cancel(b);
return;
}
-
+
/* Tell the client that we're done with the cache */
b->callback(
b, b->interface, b->protocol, AVAHI_BROWSER_CACHE_EXHAUSTED, NULL,
/* If we do wide area lookups and the the cache contained
* entries, we assume that it is complete, and tell the user
* so by firing ALL_FOR_NOW. */
-
+
b->callback(b, b->interface, b->protocol, AVAHI_BROWSER_ALL_FOR_NOW, NULL, AVAHI_LOOKUP_RESULT_WIDE_AREA, b->userdata);
}
}
AvahiLookupFlags flags,
AvahiSRecordBrowserCallback callback,
void* userdata) {
-
+
AvahiSRecordBrowser *b;
assert(server);
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !avahi_key_is_pattern(key), AVAHI_ERR_IS_PATTERN);
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, avahi_key_is_valid(key), AVAHI_ERR_INVALID_KEY);
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
- AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !(flags & AVAHI_LOOKUP_USE_WIDE_AREA) || !(flags & AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
-
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !(flags & AVAHI_LOOKUP_USE_WIDE_AREA) || !(flags & AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
+
if (!(b = avahi_new(AvahiSRecordBrowser, 1))) {
avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
return NULL;
}
-
+
b->dead = 0;
b->server = server;
b->interface = interface;
b->n_lookups = 0;
AVAHI_LLIST_HEAD_INIT(AvahiSRBLookup, b->lookups);
b->root_lookup = NULL;
-
+
AVAHI_LLIST_PREPEND(AvahiSRecordBrowser, browser, server->record_browsers, b);
/* The currently cached entries are scanned a bit later, and than we will start querying, too */
b->defer_time_event = avahi_time_event_new(server->time_event_queue, NULL, defer_callback, b);
assert(b->defer_time_event);
-
+
return b;
}
assert(b);
browser_cancel(b);
-
+
AVAHI_LLIST_REMOVE(AvahiSRecordBrowser, browser, b->server->record_browsers, b);
avahi_key_unref(b->key);
-
+
avahi_free(b);
}
void avahi_browser_cleanup(AvahiServer *server) {
AvahiSRecordBrowser *b;
AvahiSRecordBrowser *n;
-
+
assert(server);
while (server->need_browser_cleanup) {
server->need_browser_cleanup = 0;
-
+
for (b = server->record_browsers; b; b = n) {
n = b->browser_next;
-
+
if (b->dead)
avahi_s_record_browser_destroy(b);
}
- }
+ }
if (server->wide_area_lookup_engine)
avahi_wide_area_cleanup(server->wide_area_lookup_engine);
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