-/* $Id$ */
-
/***
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/domain.h>
#include <avahi-common/timeval.h>
#include <avahi-common/malloc.h>
#include "browse.h"
#include "log.h"
+#define TIMEOUT_MSEC 5000
+
struct AvahiSHostNameResolver {
AvahiServer *server;
char *host_name;
-
+
AvahiSRecordBrowser *record_browser_a;
AvahiSRecordBrowser *record_browser_aaaa;
AvahiSHostNameResolverCallback callback;
void* userdata;
+ AvahiRecord *address_record;
+ AvahiIfIndex interface;
+ AvahiProtocol protocol;
+ AvahiLookupResultFlags flags;
+
AvahiTimeEvent *time_event;
AVAHI_LLIST_FIELDS(AvahiSHostNameResolver, resolver);
};
-static void finish(AvahiSHostNameResolver *r, AvahiIfIndex interface, AvahiProtocol protocol, AvahiResolverEvent event, AvahiRecord *record) {
- AvahiAddress a;
-
+static void finish(AvahiSHostNameResolver *r, AvahiResolverEvent event) {
assert(r);
- if (r->record_browser_a) {
- avahi_s_record_browser_free(r->record_browser_a);
- r->record_browser_a = NULL;
- }
-
- if (r->record_browser_aaaa) {
- avahi_s_record_browser_free(r->record_browser_aaaa);
- r->record_browser_aaaa = NULL;
- }
-
if (r->time_event) {
avahi_time_event_free(r->time_event);
r->time_event = NULL;
}
- if (record) {
- switch (record->key->type) {
- case AVAHI_DNS_TYPE_A:
- a.family = AVAHI_PROTO_INET;
- a.data.ipv4 = record->data.a.address;
- break;
-
- case AVAHI_DNS_TYPE_AAAA:
- a.family = AVAHI_PROTO_INET6;
- a.data.ipv6 = record->data.aaaa.address;
- break;
-
- default:
- assert(0);
+ switch (event) {
+ case AVAHI_RESOLVER_FOUND: {
+ AvahiAddress a;
+
+ assert(r->address_record);
+
+ switch (r->address_record->key->type) {
+ case AVAHI_DNS_TYPE_A:
+ a.proto = AVAHI_PROTO_INET;
+ a.data.ipv4 = r->address_record->data.a.address;
+ break;
+
+ case AVAHI_DNS_TYPE_AAAA:
+ a.proto = AVAHI_PROTO_INET6;
+ a.data.ipv6 = r->address_record->data.aaaa.address;
+ break;
+
+ default:
+ abort();
+ }
+
+ r->callback(r, r->interface, r->protocol, AVAHI_RESOLVER_FOUND, r->address_record->key->name, &a, r->flags, r->userdata);
+ break;
+
}
- }
- r->callback(r, interface, protocol, event, record ? record->key->name : r->host_name, record ? &a : NULL, r->userdata);
+ case AVAHI_RESOLVER_FAILURE:
+
+ r->callback(r, r->interface, r->protocol, event, r->host_name, NULL, r->flags, r->userdata);
+ break;
+ }
}
-static void record_browser_callback(AvahiSRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, void* userdata) {
+static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
AvahiSHostNameResolver *r = userdata;
- assert(rr);
- assert(record);
+ assert(e);
+ assert(r);
+
+ avahi_server_set_errno(r->server, AVAHI_ERR_TIMEOUT);
+ finish(r, AVAHI_RESOLVER_FAILURE);
+}
+
+static void start_timeout(AvahiSHostNameResolver *r) {
+ struct timeval tv;
assert(r);
- if (!(event == AVAHI_BROWSER_NEW))
+ if (r->time_event)
return;
-
- assert(record->key->type == AVAHI_DNS_TYPE_A || record->key->type == AVAHI_DNS_TYPE_AAAA);
- 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) {
+static void record_browser_callback(
+ AvahiSRecordBrowser*rr,
+ AvahiIfIndex interface,
+ AvahiProtocol protocol,
+ AvahiBrowserEvent event,
+ AvahiRecord *record,
+ AvahiLookupResultFlags flags,
+ void* userdata) {
+
AvahiSHostNameResolver *r = userdata;
-
- assert(e);
+
+ assert(rr);
assert(r);
- finish(r, -1, AVAHI_PROTO_UNSPEC, AVAHI_RESOLVER_TIMEOUT, NULL);
+
+ switch (event) {
+ case AVAHI_BROWSER_NEW:
+ assert(record);
+ assert(record->key->type == AVAHI_DNS_TYPE_A || record->key->type == AVAHI_DNS_TYPE_AAAA);
+
+ 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->address_record) {
+ r->address_record = avahi_record_ref(record);
+ r->flags = flags;
+
+ finish(r, AVAHI_RESOLVER_FOUND);
+ }
+
+ break;
+
+ case AVAHI_BROWSER_REMOVE:
+ assert(record);
+ assert(record->key->type == AVAHI_DNS_TYPE_A || record->key->type == AVAHI_DNS_TYPE_AAAA);
+
+ if (r->address_record && avahi_record_equal_no_ttl(record, r->address_record)) {
+ avahi_record_unref(r->address_record);
+ r->address_record = NULL;
+
+ r->flags = flags;
+
+
+ /** Look for a replacement */
+ if (r->record_browser_aaaa)
+ avahi_s_record_browser_restart(r->record_browser_aaaa);
+ if (r->record_browser_a)
+ avahi_s_record_browser_restart(r->record_browser_a);
+
+ start_timeout(r);
+ }
+
+ break;
+
+ case AVAHI_BROWSER_CACHE_EXHAUSTED:
+ case AVAHI_BROWSER_ALL_FOR_NOW:
+ /* Ignore */
+ break;
+
+ case AVAHI_BROWSER_FAILURE:
+
+ /* Stop browsers */
+
+ if (r->record_browser_aaaa)
+ avahi_s_record_browser_free(r->record_browser_aaaa);
+ if (r->record_browser_a)
+ avahi_s_record_browser_free(r->record_browser_a);
+
+ r->record_browser_a = r->record_browser_aaaa = NULL;
+ r->flags = flags;
+
+ finish(r, AVAHI_RESOLVER_FAILURE);
+ break;
+ }
}
-AvahiSHostNameResolver *avahi_s_host_name_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const char *host_name, AvahiProtocol aprotocol, AvahiSHostNameResolverCallback callback, void* userdata) {
+AvahiSHostNameResolver *avahi_s_host_name_resolver_new(
+ AvahiServer *server,
+ AvahiIfIndex interface,
+ AvahiProtocol protocol,
+ const char *host_name,
+ AvahiProtocol aprotocol,
+ AvahiLookupFlags flags,
+ AvahiSHostNameResolverCallback callback,
+ void* userdata) {
+
AvahiSHostNameResolver *r;
AvahiKey *k;
- struct timeval tv;
-
+
assert(server);
assert(host_name);
assert(callback);
- assert(aprotocol == AVAHI_PROTO_UNSPEC || aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_INET6);
+ 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, avahi_is_valid_fqdn(host_name), AVAHI_ERR_INVALID_HOST_NAME);
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(aprotocol), 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);
- if (!avahi_is_valid_domain_name(host_name)) {
- avahi_server_set_errno(server, AVAHI_ERR_INVALID_HOST_NAME);
- return NULL;
- }
-
if (!(r = avahi_new(AvahiSHostNameResolver, 1))) {
avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
return NULL;
}
-
+
r->server = server;
- r->host_name = avahi_normalize_name(host_name);
+ r->host_name = avahi_normalize_name_strdup(host_name);
r->callback = callback;
r->userdata = userdata;
+ r->address_record = NULL;
+ r->interface = interface;
+ r->protocol = protocol;
+ r->flags = 0;
r->record_browser_a = r->record_browser_aaaa = NULL;
-
- avahi_elapse_time(&tv, 1000, 0);
- r->time_event = avahi_time_event_new(server->time_event_queue, &tv, time_event_callback, r);
+
+ r->time_event = NULL;
AVAHI_LLIST_PREPEND(AvahiSHostNameResolver, resolver, server->host_name_resolvers, r);
r->record_browser_aaaa = r->record_browser_a = NULL;
-
+
if (aprotocol == AVAHI_PROTO_INET || aprotocol == AVAHI_PROTO_UNSPEC) {
k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
- r->record_browser_a = avahi_s_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
+ r->record_browser_a = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, r);
avahi_key_unref(k);
if (!r->record_browser_a)
goto fail;
- }
+ }
if (aprotocol == AVAHI_PROTO_INET6 || aprotocol == AVAHI_PROTO_UNSPEC) {
k = avahi_key_new(host_name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
- r->record_browser_aaaa = avahi_s_record_browser_new(server, interface, protocol, k, record_browser_callback, r);
+ r->record_browser_aaaa = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, r);
avahi_key_unref(k);
if (!r->record_browser_aaaa)
assert(r->record_browser_aaaa || r->record_browser_a);
+ start_timeout(r);
+
return r;
fail:
if (r->time_event)
avahi_time_event_free(r->time_event);
-
+
+ if (r->address_record)
+ avahi_record_unref(r->address_record);
+
avahi_free(r->host_name);
avahi_free(r);
}
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