int avahi_query_scheduler_post(AvahiQueryScheduler *s, AvahiKey *key, int immediately, unsigned *ret_id) {
struct timeval tv;
AvahiQueryJob *qj;
assert(s);
assert(key);
if ((qj = find_history_job(s, key)))
return 0;
avahi_elapse_time(&tv, immediately ? 0 : AVAHI_QUERY_DEFER_MSEC, 0);
if ((qj = find_scheduled_job(s, key))) {
/* Duplicate questions suppression */
if (avahi_timeval_compare(&tv, &qj->delivery) < 0) {
/* If the new entry should be scheduled earlier,
* update the old entry */
qj->delivery = tv;
avahi_time_event_update(qj->time_event, &qj->delivery);
}
qj->n_posted++;
} else {
if (!(qj = job_new(s, key, 0)))
return 0; /* OOM */
qj->delivery = tv;
qj->time_event = avahi_time_event_new(s->time_event_queue, &qj->delivery, elapse_callback, qj);
}
if (ret_id)
*ret_id = qj->id;
return 1;
}
void avahi_response_scheduler_incoming(AvahiResponseScheduler *s, AvahiRecord *record, int flush_cache) {
AvahiResponseJob *rj;
assert(s);
/* This function is called whenever an incoming response was
* receieved. We drop scheduled responses which match here. The
* keyword is "DUPLICATE ANSWER SUPPRESION". */
if ((rj = find_scheduled_job(s, record))) {
if ((!rj->flush_cache || flush_cache) && /* flush cache bit was set correctly */
avahi_record_is_goodbye(record) == avahi_record_is_goodbye(rj->record) && /* both goodbye packets, or both not */
record->ttl >= rj->record->ttl/2) { /* sensible TTL */
/* A matching entry was found, so let's mark it done */
/* avahi_log_debug("Response suppressed by distributed duplicate suppression"); */
job_mark_done(s, rj);
}
return;
}
if ((rj = find_history_job(s, record))) {
/* Found a history job, let's update it */
avahi_record_unref(rj->record);
rj->record = avahi_record_ref(record);
} else
/* Found no existing history job, so let's create a new one */
if (!(rj = job_new(s, record, AVAHI_DONE)))
return; /* OOM */
rj->flush_cache = flush_cache;
rj->querier_valid = 0;
gettimeofday(&rj->delivery, NULL);
job_set_elapse_time(s, rj, AVAHI_RESPONSE_HISTORY_MSEC, 0);
}
void avahi_query_scheduler_incoming(AvahiQueryScheduler *s, AvahiKey *key) {
AvahiQueryJob *qj;
assert(s);
assert(key);
/* This function is called whenever an incoming query was
* received. We drop scheduled queries that match. The keyword is
* "DUPLICATE QUESTION SUPPRESION". */
if ((qj = find_scheduled_job(s, key))) {
job_mark_done(s, qj);
return;
}
/* Look if there's a history job for this key. If there is, just
* update the elapse time */
if (!(qj = find_history_job(s, key)))
if (!(qj = job_new(s, key, 1)))
return; /* OOM */
gettimeofday(&qj->delivery, NULL);
job_set_elapse_time(s, qj, AVAHI_QUERY_HISTORY_MSEC, 0);
}
int avahi_probe_scheduler_post(AvahiProbeScheduler *s, AvahiRecord *record, int immediately) {
AvahiProbeJob *pj;
struct timeval tv;
assert(s);
assert(record);
assert(!avahi_key_is_pattern(record->key));
if ((pj = find_history_job(s, record)))
return 0;
avahi_elapse_time(&tv, immediately ? 0 : AVAHI_PROBE_DEFER_MSEC, 0);
if ((pj = find_scheduled_job(s, record))) {
if (avahi_timeval_compare(&tv, &pj->delivery) < 0) {
/* If the new entry should be scheduled earlier, update the old entry */
pj->delivery = tv;
avahi_time_event_update(pj->time_event, &pj->delivery);
}
return 1;
} else {
/* Create a new job and schedule it */
if (!(pj = job_new(s, record, 0)))
return 0; /* OOM */
pj->delivery = tv;
pj->time_event = avahi_time_event_new(s->time_event_queue, &pj->delivery, elapse_callback, pj);
/* avahi_log_debug("Accepted new probe job."); */
return 1;
}
}
int avahi_response_scheduler_post(AvahiResponseScheduler *s, AvahiRecord *record, int flush_cache, const AvahiAddress *querier, int immediately) {
AvahiResponseJob *rj;
struct timeval tv;
/* char *t; */
assert(s);
assert(record);
assert(!avahi_key_is_pattern(record->key));
/* t = avahi_record_to_string(record); */
/* avahi_log_debug("post %i %s", immediately, t); */
/* avahi_free(t); */
/* Check whether this response is suppressed */
if (querier &&
(rj = find_suppressed_job(s, record, querier)) &&
avahi_record_is_goodbye(record) == avahi_record_is_goodbye(rj->record) &&
rj->record->ttl >= record->ttl/2) {
/* avahi_log_debug("Response suppressed by known answer suppression."); */
return 0;
}
/* Check if we already sent this response recently */
if ((rj = find_history_job(s, record))) {
if (avahi_record_is_goodbye(record) == avahi_record_is_goodbye(rj->record) &&
rj->record->ttl >= record->ttl/2 &&
(rj->flush_cache || !flush_cache)) {
/* avahi_log_debug("Response suppressed by local duplicate suppression (history)"); */
return 0;
}
/* Outdated ... */
job_free(s, rj);
}
avahi_elapse_time(&tv, immediately ? 0 : AVAHI_RESPONSE_DEFER_MSEC, immediately ? 0 : AVAHI_RESPONSE_JITTER_MSEC);
if ((rj = find_scheduled_job(s, record))) {
/* avahi_log_debug("Response suppressed by local duplicate suppression (scheduled)"); */
/* Update a little ... */
/* Update the time if the new is prior to the old */
if (avahi_timeval_compare(&tv, &rj->delivery) < 0) {
rj->delivery = tv;
avahi_time_event_update(rj->time_event, &rj->delivery);
}
/* Update the flush cache bit */
if (flush_cache)
rj->flush_cache = 1;
/* Update the querier field */
if (!querier || (rj->querier_valid && avahi_address_cmp(querier, &rj->querier) != 0))
rj->querier_valid = 0;
/* Update record data (just for the TTL) */
avahi_record_unref(rj->record);
rj->record = avahi_record_ref(record);
return 1;
} else {
/* avahi_log_debug("Accepted new response job."); */
/* Create a new job and schedule it */
if (!(rj = job_new(s, record, AVAHI_SCHEDULED)))
return 0; /* OOM */
rj->delivery = tv;
rj->time_event = avahi_time_event_new(s->time_event_queue, &rj->delivery, elapse_callback, rj);
rj->flush_cache = flush_cache;
if ((rj->querier_valid = !!querier))
rj->querier = *querier;
return 1;
}
}
