+++ /dev/null
-/***
- 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 <stdlib.h>
-
-#include <avahi-common/domain.h>
-#include <avahi-common/timeval.h>
-#include <avahi-common/malloc.h>
-
-#include "probe-sched.h"
-#include "log.h"
-#include "rr-util.h"
-
-#define AVAHI_PROBE_HISTORY_MSEC 150
-#define AVAHI_PROBE_DEFER_MSEC 50
-
-typedef struct AvahiProbeJob AvahiProbeJob;
-
-struct AvahiProbeJob {
- AvahiProbeScheduler *scheduler;
- AvahiTimeEvent *time_event;
-
- int chosen; /* Use for packet assembling */
- int done;
- struct timeval delivery;
-
- AvahiRecord *record;
-
- AVAHI_LLIST_FIELDS(AvahiProbeJob, jobs);
-};
-
-struct AvahiProbeScheduler {
- AvahiInterface *interface;
- AvahiTimeEventQueue *time_event_queue;
-
- AVAHI_LLIST_HEAD(AvahiProbeJob, jobs);
- AVAHI_LLIST_HEAD(AvahiProbeJob, history);
-};
-
-static AvahiProbeJob* job_new(AvahiProbeScheduler *s, AvahiRecord *record, int done) {
- AvahiProbeJob *pj;
-
- assert(s);
- assert(record);
-
- if (!(pj = avahi_new(AvahiProbeJob, 1))) {
- avahi_log_error(__FILE__": Out of memory");
- return NULL; /* OOM */
- }
-
- pj->scheduler = s;
- pj->record = avahi_record_ref(record);
- pj->time_event = NULL;
- pj->chosen = 0;
-
- if ((pj->done = done))
- AVAHI_LLIST_PREPEND(AvahiProbeJob, jobs, s->history, pj);
- else
- AVAHI_LLIST_PREPEND(AvahiProbeJob, jobs, s->jobs, pj);
-
- return pj;
-}
-
-static void job_free(AvahiProbeScheduler *s, AvahiProbeJob *pj) {
- assert(pj);
-
- if (pj->time_event)
- avahi_time_event_free(pj->time_event);
-
- if (pj->done)
- AVAHI_LLIST_REMOVE(AvahiProbeJob, jobs, s->history, pj);
- else
- AVAHI_LLIST_REMOVE(AvahiProbeJob, jobs, s->jobs, pj);
-
- avahi_record_unref(pj->record);
- avahi_free(pj);
-}
-
-static void elapse_callback(AvahiTimeEvent *e, void* data);
-
-static void job_set_elapse_time(AvahiProbeScheduler *s, AvahiProbeJob *pj, unsigned msec, unsigned jitter) {
- struct timeval tv;
-
- assert(s);
- assert(pj);
-
- avahi_elapse_time(&tv, msec, jitter);
-
- if (pj->time_event)
- avahi_time_event_update(pj->time_event, &tv);
- else
- pj->time_event = avahi_time_event_new(s->time_event_queue, &tv, elapse_callback, pj);
-}
-
-static void job_mark_done(AvahiProbeScheduler *s, AvahiProbeJob *pj) {
- assert(s);
- assert(pj);
-
- assert(!pj->done);
-
- AVAHI_LLIST_REMOVE(AvahiProbeJob, jobs, s->jobs, pj);
- AVAHI_LLIST_PREPEND(AvahiProbeJob, jobs, s->history, pj);
-
- pj->done = 1;
-
- job_set_elapse_time(s, pj, AVAHI_PROBE_HISTORY_MSEC, 0);
- gettimeofday(&pj->delivery, NULL);
-}
-
-AvahiProbeScheduler *avahi_probe_scheduler_new(AvahiInterface *i) {
- AvahiProbeScheduler *s;
-
- assert(i);
-
- if (!(s = avahi_new(AvahiProbeScheduler, 1))) {
- avahi_log_error(__FILE__": Out of memory");
- return NULL;
- }
-
- s->interface = i;
- s->time_event_queue = i->monitor->server->time_event_queue;
-
- AVAHI_LLIST_HEAD_INIT(AvahiProbeJob, s->jobs);
- AVAHI_LLIST_HEAD_INIT(AvahiProbeJob, s->history);
-
- return s;
-}
-
-void avahi_probe_scheduler_free(AvahiProbeScheduler *s) {
- assert(s);
-
- avahi_probe_scheduler_clear(s);
- avahi_free(s);
-}
-
-void avahi_probe_scheduler_clear(AvahiProbeScheduler *s) {
- assert(s);
-
- while (s->jobs)
- job_free(s, s->jobs);
- while (s->history)
- job_free(s, s->history);
-}
-
-static int packet_add_probe_query(AvahiProbeScheduler *s, AvahiDnsPacket *p, AvahiProbeJob *pj) {
- size_t size;
- AvahiKey *k;
- int b;
-
- assert(s);
- assert(p);
- assert(pj);
-
- assert(!pj->chosen);
-
- /* Estimate the size for this record */
- size =
- avahi_key_get_estimate_size(pj->record->key) +
- avahi_record_get_estimate_size(pj->record);
-
- /* Too large */
- if (size > avahi_dns_packet_space(p))
- return 0;
-
- /* Create the probe query */
- if (!(k = avahi_key_new(pj->record->key->name, pj->record->key->clazz, AVAHI_DNS_TYPE_ANY)))
- return 0; /* OOM */
-
- b = !!avahi_dns_packet_append_key(p, k, 0);
- assert(b);
-
- /* Mark this job for addition to the packet */
- pj->chosen = 1;
-
- /* Scan for more jobs whith matching key pattern */
- for (pj = s->jobs; pj; pj = pj->jobs_next) {
- if (pj->chosen)
- continue;
-
- /* Does the record match the probe? */
- if (k->clazz != pj->record->key->clazz || !avahi_domain_equal(k->name, pj->record->key->name))
- continue;
-
- /* This job wouldn't fit in */
- if (avahi_record_get_estimate_size(pj->record) > avahi_dns_packet_space(p))
- break;
-
- /* Mark this job for addition to the packet */
- pj->chosen = 1;
- }
-
- avahi_key_unref(k);
-
- return 1;
-}
-
-static void elapse_callback(AVAHI_GCC_UNUSED AvahiTimeEvent *e, void* data) {
- AvahiProbeJob *pj = data, *next;
- AvahiProbeScheduler *s;
- AvahiDnsPacket *p;
- unsigned n;
-
- assert(pj);
- s = pj->scheduler;
-
- if (pj->done) {
- /* Lets remove it from the history */
- job_free(s, pj);
- return;
- }
-
- if (!(p = avahi_dns_packet_new_query(s->interface->hardware->mtu)))
- return; /* OOM */
- n = 1;
-
- /* Add the import probe */
- if (!packet_add_probe_query(s, p, pj)) {
- size_t size;
- AvahiKey *k;
- int b;
-
- avahi_dns_packet_free(p);
-
- /* The probe didn't fit in the package, so let's allocate a larger one */
-
- size =
- avahi_key_get_estimate_size(pj->record->key) +
- avahi_record_get_estimate_size(pj->record) +
- AVAHI_DNS_PACKET_HEADER_SIZE;
-
- if (!(p = avahi_dns_packet_new_query(size + AVAHI_DNS_PACKET_EXTRA_SIZE)))
- return; /* OOM */
-
- if (!(k = avahi_key_new(pj->record->key->name, pj->record->key->clazz, AVAHI_DNS_TYPE_ANY))) {
- avahi_dns_packet_free(p);
- return; /* OOM */
- }
-
- b = avahi_dns_packet_append_key(p, k, 0) && avahi_dns_packet_append_record(p, pj->record, 0, 0);
- avahi_key_unref(k);
-
- if (b) {
- avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_NSCOUNT, 1);
- avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_QDCOUNT, 1);
- avahi_interface_send_packet(s->interface, p);
- } else
- avahi_log_warn("Probe record too large, cannot send");
-
- avahi_dns_packet_free(p);
- job_mark_done(s, pj);
-
- return;
- }
-
- /* Try to fill up packet with more probes, if available */
- for (pj = s->jobs; pj; pj = pj->jobs_next) {
-
- if (pj->chosen)
- continue;
-
- if (!packet_add_probe_query(s, p, pj))
- break;
-
- n++;
- }
-
- avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_QDCOUNT, n);
-
- n = 0;
-
- /* Now add the chosen records to the authorative section */
- for (pj = s->jobs; pj; pj = next) {
-
- next = pj->jobs_next;
-
- if (!pj->chosen)
- continue;
-
- if (!avahi_dns_packet_append_record(p, pj->record, 0, 0)) {
-/* avahi_log_warn("Bad probe size estimate!"); */
-
- /* Unmark all following jobs */
- for (; pj; pj = pj->jobs_next)
- pj->chosen = 0;
-
- break;
- }
-
- job_mark_done(s, pj);
-
- n ++;
- }
-
- avahi_dns_packet_set_field(p, AVAHI_DNS_FIELD_NSCOUNT, n);
-
- /* Send it now */
- avahi_interface_send_packet(s->interface, p);
- avahi_dns_packet_free(p);
-}
-
-static AvahiProbeJob* find_scheduled_job(AvahiProbeScheduler *s, AvahiRecord *record) {
- AvahiProbeJob *pj;
-
- assert(s);
- assert(record);
-
- for (pj = s->jobs; pj; pj = pj->jobs_next) {
- assert(!pj->done);
-
- if (avahi_record_equal_no_ttl(pj->record, record))
- return pj;
- }
-
- return NULL;
-}
-
-static AvahiProbeJob* find_history_job(AvahiProbeScheduler *s, AvahiRecord *record) {
- AvahiProbeJob *pj;
-
- assert(s);
- assert(record);
-
- for (pj = s->history; pj; pj = pj->jobs_next) {
- assert(pj->done);
-
- if (avahi_record_equal_no_ttl(pj->record, record)) {
- /* Check whether this entry is outdated */
-
- if (avahi_age(&pj->delivery) > AVAHI_PROBE_HISTORY_MSEC*1000) {
- /* it is outdated, so let's remove it */
- job_free(s, pj);
- return NULL;
- }
-
- return pj;
- }
- }
-
- return NULL;
-}
-
-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;
- }
-}
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