-/* $Id$ */
-
/***
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
#include <config.h>
#endif
+#include <stdlib.h>
+
+#include <avahi-common/timeval.h>
+#include <avahi-common/malloc.h>
+#include <avahi-common/error.h>
+#include <avahi-common/domain.h>
+
#include "browse.h"
-#include "util.h"
-struct AvahiAddressResolver {
+#define TIMEOUT_MSEC 5000
+
+struct AvahiSAddressResolver {
AvahiServer *server;
AvahiAddress address;
-
- AvahiRecordBrowser *record_browser;
- AvahiAddressResolverCallback callback;
- gpointer userdata;
+ AvahiSRecordBrowser *record_browser;
+
+ AvahiSAddressResolverCallback callback;
+ void* userdata;
+
+ AvahiRecord *ptr_record;
+ AvahiIfIndex interface;
+ AvahiProtocol protocol;
+ AvahiLookupResultFlags flags;
+
+ int retry_with_multicast;
+ AvahiKey *key;
AvahiTimeEvent *time_event;
- AVAHI_LLIST_FIELDS(AvahiAddressResolver, resolver);
+ AVAHI_LLIST_FIELDS(AvahiSAddressResolver, resolver);
};
-static void finish(AvahiAddressResolver *r, AvahiIfIndex interface, AvahiProtocol protocol, AvahiResolverEvent event, AvahiRecord *record) {
- g_assert(r);
-
- avahi_record_browser_free(r->record_browser);
- r->record_browser = NULL;
+static void finish(AvahiSAddressResolver *r, AvahiResolverEvent event) {
+ assert(r);
if (r->time_event) {
- avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
+ avahi_time_event_free(r->time_event);
r->time_event = NULL;
}
- r->callback(r, interface, protocol, event, &r->address, record ? record->data.ptr.name : NULL, r->userdata);
+ switch (event) {
+ case AVAHI_RESOLVER_FAILURE:
+ r->callback(r, r->interface, r->protocol, event, &r->address, NULL, r->flags, r->userdata);
+ break;
+
+ case AVAHI_RESOLVER_FOUND:
+ assert(r->ptr_record);
+ r->callback(r, r->interface, r->protocol, event, &r->address, r->ptr_record->data.ptr.name, r->flags, r->userdata);
+ break;
+ }
}
-static void record_browser_callback(AvahiRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, gpointer userdata) {
- AvahiAddressResolver *r = userdata;
+static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
+ AvahiSAddressResolver *r = userdata;
- g_assert(rr);
- g_assert(record);
- g_assert(r);
+ assert(e);
+ assert(r);
- if (!(event == AVAHI_BROWSER_NEW))
- return;
+ avahi_server_set_errno(r->server, AVAHI_ERR_TIMEOUT);
+ finish(r, AVAHI_RESOLVER_FAILURE);
+}
+
+static void start_timeout(AvahiSAddressResolver *r) {
+ struct timeval tv;
+ assert(r);
- g_assert(record->key->type == AVAHI_DNS_TYPE_PTR);
+ if (r->time_event)
+ return;
- finish(r, interface, protocol, AVAHI_RESOLVER_FOUND, record);
+ avahi_elapse_time(&tv, TIMEOUT_MSEC, 0);
+ r->time_event = avahi_time_event_new(r->server->time_event_queue, &tv, time_event_callback, r);
}
-static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
- AvahiAddressResolver *r = userdata;
-
- g_assert(e);
- g_assert(r);
+static void record_browser_callback(
+ AvahiSRecordBrowser*rr,
+ AvahiIfIndex interface,
+ AvahiProtocol protocol,
+ AvahiBrowserEvent event,
+ AvahiRecord *record,
+ AvahiLookupResultFlags flags,
+ void* userdata) {
+
+ AvahiSAddressResolver *r = userdata;
+
+ assert(rr);
+ assert(r);
+
+ switch (event) {
+ case AVAHI_BROWSER_NEW:
+ assert(record);
+ assert(record->key->type == AVAHI_DNS_TYPE_PTR);
+
+ if (r->interface > 0 && interface != r->interface)
+ return;
+
+ if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
+ return;
+
+ if (r->interface <= 0)
+ r->interface = interface;
+
+ if (r->protocol == AVAHI_PROTO_UNSPEC)
+ r->protocol = protocol;
+
+ if (!r->ptr_record) {
+ r->ptr_record = avahi_record_ref(record);
+ r->flags = flags;
+
+ finish(r, AVAHI_RESOLVER_FOUND);
+ }
+ break;
- finish(r, -1, AVAHI_PROTO_UNSPEC, AVAHI_RESOLVER_TIMEOUT, NULL);
+ case AVAHI_BROWSER_REMOVE:
+ assert(record);
+ assert(record->key->type == AVAHI_DNS_TYPE_PTR);
+
+ if (r->ptr_record && avahi_record_equal_no_ttl(record, r->ptr_record)) {
+ avahi_record_unref(r->ptr_record);
+ r->ptr_record = NULL;
+ r->flags = flags;
+
+ /** Look for a replacement */
+ avahi_s_record_browser_restart(r->record_browser);
+ start_timeout(r);
+ }
+
+ break;
+
+ case AVAHI_BROWSER_CACHE_EXHAUSTED:
+ case AVAHI_BROWSER_ALL_FOR_NOW:
+ break;
+
+ case AVAHI_BROWSER_FAILURE:
+
+ if (r->retry_with_multicast) {
+ r->retry_with_multicast = 0;
+
+ avahi_s_record_browser_free(r->record_browser);
+ r->record_browser = avahi_s_record_browser_new(r->server, r->interface, r->protocol, r->key, AVAHI_LOOKUP_USE_MULTICAST, record_browser_callback, r);
+
+ if (r->record_browser) {
+ start_timeout(r);
+ break;
+ }
+ }
+
+ r->flags = flags;
+ finish(r, AVAHI_RESOLVER_FAILURE);
+ break;
+ }
}
-AvahiAddressResolver *avahi_address_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const AvahiAddress *address, AvahiAddressResolverCallback callback, gpointer userdata) {
- AvahiAddressResolver *r;
+AvahiSAddressResolver *avahi_s_address_resolver_new(
+ AvahiServer *server,
+ AvahiIfIndex interface,
+ AvahiProtocol protocol,
+ const AvahiAddress *address,
+ AvahiLookupFlags flags,
+ AvahiSAddressResolverCallback callback,
+ void* userdata) {
+
+ AvahiSAddressResolver *r;
AvahiKey *k;
- gchar *n;
- struct timeval tv;
+ char n[AVAHI_DOMAIN_NAME_MAX];
+
+ assert(server);
+ assert(address);
+ assert(callback);
+
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE);
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL);
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, address->proto == AVAHI_PROTO_INET || address->proto == AVAHI_PROTO_INET6, AVAHI_ERR_INVALID_PROTOCOL);
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
+
+ avahi_reverse_lookup_name(address, n, sizeof(n));
- g_assert(server);
- g_assert(address);
- g_assert(callback);
+ if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR))) {
+ avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
+ return NULL;
+ }
- g_assert(address->family == AVAHI_PROTO_INET || address->family == AVAHI_PROTO_INET6);
+ if (!(r = avahi_new(AvahiSAddressResolver, 1))) {
+ avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
+ avahi_key_unref(k);
+ return NULL;
+ }
- r = g_new(AvahiAddressResolver, 1);
r->server = server;
r->address = *address;
r->callback = callback;
r->userdata = userdata;
+ r->ptr_record = NULL;
+ r->interface = interface;
+ r->protocol = protocol;
+ r->flags = 0;
+ r->retry_with_multicast = 0;
+ r->key = k;
- avahi_elapse_time(&tv, 1000, 0);
- r->time_event = avahi_time_event_queue_add(server->time_event_queue, &tv, time_event_callback, r);
-
- AVAHI_LLIST_PREPEND(AvahiAddressResolver, resolver, server->address_resolvers, r);
-
- if (address->family == AVAHI_PROTO_INET)
- n = avahi_reverse_lookup_name_ipv4(&address->data.ipv4);
- else
- n = avahi_reverse_lookup_name_ipv6_arpa(&address->data.ipv6);
-
- k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR);
- g_free(n);
-
- r->record_browser = avahi_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
- avahi_key_unref(k);
+ r->record_browser = NULL;
+ AVAHI_LLIST_PREPEND(AvahiSAddressResolver, resolver, server->address_resolvers, r);
+
+ r->time_event = NULL;
+
+ if (!(flags & (AVAHI_LOOKUP_USE_MULTICAST|AVAHI_LOOKUP_USE_WIDE_AREA))) {
+
+ if (!server->wide_area_lookup_engine || !avahi_wide_area_has_servers(server->wide_area_lookup_engine))
+ flags |= AVAHI_LOOKUP_USE_MULTICAST;
+ else {
+ flags |= AVAHI_LOOKUP_USE_WIDE_AREA;
+ r->retry_with_multicast = 1;
+ }
+ }
+
+ r->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, r);
if (!r->record_browser) {
- avahi_address_resolver_free(r);
+ avahi_s_address_resolver_free(r);
return NULL;
}
-
+
+ start_timeout(r);
+
return r;
}
-void avahi_address_resolver_free(AvahiAddressResolver *r) {
- g_assert(r);
+void avahi_s_address_resolver_free(AvahiSAddressResolver *r) {
+ assert(r);
- AVAHI_LLIST_REMOVE(AvahiAddressResolver, resolver, r->server->address_resolvers, r);
+ AVAHI_LLIST_REMOVE(AvahiSAddressResolver, resolver, r->server->address_resolvers, r);
if (r->record_browser)
- avahi_record_browser_free(r->record_browser);
+ avahi_s_record_browser_free(r->record_browser);
if (r->time_event)
- avahi_time_event_queue_remove(r->server->time_event_queue, r->time_event);
-
- g_free(r);
+ avahi_time_event_free(r->time_event);
+
+ if (r->ptr_record)
+ avahi_record_unref(r->ptr_record);
+
+ if (r->key)
+ avahi_key_unref(r->key);
+
+ avahi_free(r);
}
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