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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/timeval.h>
#include <avahi-common/malloc.h>
#include <avahi-common/error.h>
#include <avahi-common/domain.h>
#include "querier.h"
#include "log.h"
struct AvahiQuerier {
AvahiInterface *interface;
AvahiKey *key;
int n_used;
unsigned sec_delay;
AvahiTimeEvent *time_event;
struct timeval creation_time;
AVAHI_LLIST_FIELDS(AvahiQuerier, queriers);
};
void avahi_querier_free(AvahiQuerier *q) {
assert(q);
AVAHI_LLIST_REMOVE(AvahiQuerier, queriers, q->interface->queriers, q);
avahi_hashmap_remove(q->interface->queriers_by_key, q->key);
avahi_key_unref(q->key);
avahi_time_event_free(q->time_event);
avahi_free(q);
}
static void querier_elapse_callback(AvahiTimeEvent *e, void *userdata) {
AvahiQuerier *q = userdata;
struct timeval tv;
assert(q);
avahi_interface_post_query(q->interface, q->key, 0);
q->sec_delay *= 2;
if (q->sec_delay >= 60*60) /* 1h */
q->sec_delay = 60*60;
avahi_elapse_time(&tv, q->sec_delay*1000, 0);
avahi_time_event_update(q->time_event, &tv);
}
void avahi_querier_add(AvahiInterface *i, AvahiKey *key, struct timeval *ret_ctime) {
AvahiQuerier *q;
struct timeval tv;
assert(i);
assert(key);
if ((q = avahi_hashmap_lookup(i->queriers_by_key, key))) {
/* Someone is already browsing for records of this RR key */
q->n_used++;
/* Return the creation time */
if (ret_ctime)
*ret_ctime = q->creation_time;
return;
}
/* No one is browsing for this RR key, so we add a new querier */
if (!(q = avahi_new(AvahiQuerier, 1)))
return; /* OOM */
q->key = avahi_key_ref(key);
q->interface = i;
q->n_used = 1;
q->sec_delay = 1;
gettimeofday(&q->creation_time, NULL);
/* Do the initial query */
avahi_interface_post_query(i, key, 0);
/* Schedule next queries */
q->time_event = avahi_time_event_new(i->monitor->server->time_event_queue, avahi_elapse_time(&tv, q->sec_delay*1000, 0), querier_elapse_callback, q);
AVAHI_LLIST_PREPEND(AvahiQuerier, queriers, i->queriers, q);
avahi_hashmap_insert(i->queriers_by_key, q->key, q);
/* Return the creation time */
if (ret_ctime)
*ret_ctime = q->creation_time;
}
void avahi_querier_remove(AvahiInterface *i, AvahiKey *key) {
AvahiQuerier *q;
if (!(q = avahi_hashmap_lookup(i->queriers_by_key, key))) {
/* The was no querier for this RR key */
avahi_log_warn(__FILE__": querier_remove() called but no querier to remove");
return;
}
assert(q->n_used >= 1);
if ((--q->n_used) <= 0)
avahi_querier_free(q);
}
static void remove_querier_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, void* userdata) {
assert(m);
assert(i);
assert(userdata);
if (i->announcing)
avahi_querier_remove(i, (AvahiKey*) userdata);
}
void avahi_querier_remove_for_all(AvahiServer *s, AvahiIfIndex idx, AvahiProtocol protocol, AvahiKey *key) {
assert(s);
assert(key);
avahi_interface_monitor_walk(s->monitor, idx, protocol, remove_querier_callback, key);
}
struct cbdata {
AvahiKey *key;
struct timeval *ret_ctime;
};
static void add_querier_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, void* userdata) {
struct cbdata *cbdata = userdata;
assert(m);
assert(i);
assert(cbdata);
if (i->announcing) {
struct timeval tv;
avahi_querier_add(i, cbdata->key, &tv);
if (cbdata->ret_ctime && avahi_timeval_compare(&tv, cbdata->ret_ctime) > 0)
*cbdata->ret_ctime = tv;
}
}
void avahi_querier_add_for_all(AvahiServer *s, AvahiIfIndex idx, AvahiProtocol protocol, AvahiKey *key, struct timeval *ret_ctime) {
struct cbdata cbdata;
assert(s);
assert(key);
cbdata.key = key;
cbdata.ret_ctime = ret_ctime;
if (ret_ctime)
ret_ctime->tv_sec = ret_ctime->tv_usec = 0;
avahi_interface_monitor_walk(s->monitor, idx, protocol, add_querier_callback, &cbdata);
}
int avahi_querier_exists(AvahiInterface *i, AvahiKey *key) {
assert(i);
assert(key);
if (avahi_hashmap_lookup(i->queriers_by_key, key))
return 1;
return 0;
}
void avahi_querier_free_all(AvahiInterface *i) {
assert(i);
while (i->queriers)
avahi_querier_free(i->queriers);
}
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