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/* $Id$ */
/***
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
USA.
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <avahi-common/domain.h>
#include <avahi-common/malloc.h>
#include <avahi-common/error.h>
#include "browse.h"
#include "log.h"
struct AvahiSDomainBrowser {
int ref;
AvahiServer *server;
AvahiSRecordBrowser *record_browser;
AvahiDomainBrowserType type;
AvahiSDomainBrowserCallback callback;
void* userdata;
AvahiTimeEvent *defer_event;
int all_for_now_scheduled;
AVAHI_LLIST_FIELDS(AvahiSDomainBrowser, browser);
};
static void inc_ref(AvahiSDomainBrowser *b) {
assert(b);
assert(b->ref >= 1);
b->ref++;
}
static void record_browser_callback(
AvahiSRecordBrowser*rr,
AvahiIfIndex interface,
AvahiProtocol protocol,
AvahiBrowserEvent event,
AvahiRecord *record,
AvahiLookupResultFlags flags,
void* userdata) {
AvahiSDomainBrowser *b = userdata;
char *n = NULL;
assert(rr);
assert(b);
if (event == AVAHI_BROWSER_ALL_FOR_NOW &&
b->defer_event) {
b->all_for_now_scheduled = 1;
return;
}
/* Filter flags */
flags &= AVAHI_LOOKUP_RESULT_CACHED | AVAHI_LOOKUP_RESULT_MULTICAST | AVAHI_LOOKUP_RESULT_WIDE_AREA;
if (record) {
assert(record->key->type == AVAHI_DNS_TYPE_PTR);
n = record->data.ptr.name;
if (b->type == AVAHI_DOMAIN_BROWSER_BROWSE) {
AvahiStringList *l;
/* Filter out entries defined statically */
for (l = b->server->config.browse_domains; l; l = l->next)
if (avahi_domain_equal((char*) l->text, n))
return;
}
}
b->callback(b, interface, protocol, event, n, flags, b->userdata);
}
static void defer_callback(AvahiTimeEvent *e, void *userdata) {
AvahiSDomainBrowser *b = userdata;
AvahiStringList *l;
assert(e);
assert(b);
avahi_time_event_free(b->defer_event);
b->defer_event = NULL;
/* Increase ref counter */
inc_ref(b);
for (l = b->server->config.browse_domains; l; l = l->next) {
/* Check whether this object still exists outside our own
* stack frame */
if (b->ref <= 1)
break;
b->callback(b, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_BROWSER_NEW, (char*) l->text, AVAHI_LOOKUP_RESULT_STATIC, b->userdata);
}
if (b->ref > 1) {
/* If the ALL_FOR_NOW event has already been scheduled, execute it now */
if (b->all_for_now_scheduled)
b->callback(b, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_BROWSER_ALL_FOR_NOW, NULL, 0, b->userdata);
}
/* Decrease ref counter */
avahi_s_domain_browser_free(b);
}
AvahiSDomainBrowser *avahi_s_domain_browser_new(
AvahiServer *server,
AvahiIfIndex interface,
AvahiProtocol protocol,
const char *domain,
AvahiDomainBrowserType type,
AvahiLookupFlags flags,
AvahiSDomainBrowserCallback callback,
void* userdata) {
static const char * const type_table[AVAHI_DOMAIN_BROWSER_MAX] = {
"b",
"db",
"r",
"dr",
"lb"
};
AvahiSDomainBrowser *b;
AvahiKey *k = NULL;
char n[AVAHI_DOMAIN_NAME_MAX];
int r;
assert(server);
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, type < AVAHI_DOMAIN_BROWSER_MAX, AVAHI_ERR_INVALID_FLAGS);
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME);
AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
if (!domain)
domain = server->domain_name;
if ((r = avahi_service_name_join(n, sizeof(n), type_table[type], "_dns-sd._udp", domain)) < 0) {
avahi_server_set_errno(server, r);
return NULL;
}
if (!(b = avahi_new(AvahiSDomainBrowser, 1))) {
avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
return NULL;
}
b->ref = 1;
b->server = server;
b->callback = callback;
b->userdata = userdata;
b->record_browser = NULL;
b->type = type;
b->all_for_now_scheduled = 0;
AVAHI_LLIST_PREPEND(AvahiSDomainBrowser, browser, server->domain_browsers, b);
if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_PTR))) {
avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
goto fail;
}
if (!(b->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, b)))
goto fail;
avahi_key_unref(k);
b->defer_event = avahi_time_event_new(server->time_event_queue, NULL, defer_callback, b);
return b;
fail:
if (k)
avahi_key_unref(k);
avahi_s_domain_browser_free(b);
return NULL;
}
void avahi_s_domain_browser_free(AvahiSDomainBrowser *b) {
assert(b);
assert(b->ref >= 1);
if (--b->ref > 0)
return;
AVAHI_LLIST_REMOVE(AvahiSDomainBrowser, browser, b->server->domain_browsers, b);
if (b->record_browser)
avahi_s_record_browser_free(b->record_browser);
if (b->defer_event)
avahi_time_event_free(b->defer_event);
avahi_free(b);
}
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