+++ /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/timeval.h>
-#include <avahi-common/malloc.h>
-
-#include "announce.h"
-#include "log.h"
-#include "rr-util.h"
-
-#define AVAHI_ANNOUNCEMENT_JITTER_MSEC 250
-#define AVAHI_PROBE_JITTER_MSEC 250
-#define AVAHI_PROBE_INTERVAL_MSEC 250
-
-static void remove_announcer(AvahiServer *s, AvahiAnnouncer *a) {
- assert(s);
- assert(a);
-
- if (a->time_event)
- avahi_time_event_free(a->time_event);
-
- AVAHI_LLIST_REMOVE(AvahiAnnouncer, by_interface, a->interface->announcers, a);
- AVAHI_LLIST_REMOVE(AvahiAnnouncer, by_entry, a->entry->announcers, a);
-
- avahi_free(a);
-}
-
-static void elapse_announce(AvahiTimeEvent *e, void *userdata);
-
-static void set_timeout(AvahiAnnouncer *a, const struct timeval *tv) {
- assert(a);
-
- if (!tv) {
- if (a->time_event) {
- avahi_time_event_free(a->time_event);
- a->time_event = NULL;
- }
- } else {
-
- if (a->time_event)
- avahi_time_event_update(a->time_event, tv);
- else
- a->time_event = avahi_time_event_new(a->server->time_event_queue, tv, elapse_announce, a);
- }
-}
-
-static void next_state(AvahiAnnouncer *a);
-
-void avahi_s_entry_group_check_probed(AvahiSEntryGroup *g, int immediately) {
- AvahiEntry *e;
- assert(g);
- assert(!g->dead);
-
- /* Check whether all group members have been probed */
-
- if (g->state != AVAHI_ENTRY_GROUP_REGISTERING || g->n_probing > 0)
- return;
-
- avahi_s_entry_group_change_state(g, AVAHI_ENTRY_GROUP_ESTABLISHED);
-
- if (g->dead)
- return;
-
- for (e = g->entries; e; e = e->by_group_next) {
- AvahiAnnouncer *a;
-
- for (a = e->announcers; a; a = a->by_entry_next) {
-
- if (a->state != AVAHI_WAITING)
- continue;
-
- a->state = AVAHI_ANNOUNCING;
-
- if (immediately) {
- /* Shortcut */
-
- a->n_iteration = 1;
- next_state(a);
- } else {
- struct timeval tv;
- a->n_iteration = 0;
- avahi_elapse_time(&tv, 0, AVAHI_ANNOUNCEMENT_JITTER_MSEC);
- set_timeout(a, &tv);
- }
- }
- }
-}
-
-static void next_state(AvahiAnnouncer *a) {
- assert(a);
-
- if (a->state == AVAHI_WAITING) {
-
- assert(a->entry->group);
-
- avahi_s_entry_group_check_probed(a->entry->group, 1);
-
- } else if (a->state == AVAHI_PROBING) {
-
- if (a->n_iteration >= 4) {
- /* Probing done */
-
- if (a->entry->group) {
- assert(a->entry->group->n_probing);
- a->entry->group->n_probing--;
- }
-
- if (a->entry->group && a->entry->group->state == AVAHI_ENTRY_GROUP_REGISTERING)
- a->state = AVAHI_WAITING;
- else {
- a->state = AVAHI_ANNOUNCING;
- a->n_iteration = 1;
- }
-
- set_timeout(a, NULL);
- next_state(a);
- } else {
- struct timeval tv;
-
- avahi_interface_post_probe(a->interface, a->entry->record, 0);
-
- avahi_elapse_time(&tv, AVAHI_PROBE_INTERVAL_MSEC, 0);
- set_timeout(a, &tv);
-
- a->n_iteration++;
- }
-
- } else if (a->state == AVAHI_ANNOUNCING) {
-
- if (a->entry->flags & AVAHI_PUBLISH_UNIQUE)
- /* Send the whole rrset at once */
- avahi_server_prepare_matching_responses(a->server, a->interface, a->entry->record->key, 0);
- else
- avahi_server_prepare_response(a->server, a->interface, a->entry, 0, 0);
-
- avahi_server_generate_response(a->server, a->interface, NULL, NULL, 0, 0, 0);
-
- if (++a->n_iteration >= 4) {
- /* Announcing done */
-
- a->state = AVAHI_ESTABLISHED;
-
- set_timeout(a, NULL);
- } else {
- struct timeval tv;
- avahi_elapse_time(&tv, a->sec_delay*1000, AVAHI_ANNOUNCEMENT_JITTER_MSEC);
-
- if (a->n_iteration < 10)
- a->sec_delay *= 2;
-
- set_timeout(a, &tv);
- }
- }
-}
-
-static void elapse_announce(AvahiTimeEvent *e, void *userdata) {
- assert(e);
-
- next_state(userdata);
-}
-
-static AvahiAnnouncer *get_announcer(AvahiServer *s, AvahiEntry *e, AvahiInterface *i) {
- AvahiAnnouncer *a;
-
- assert(s);
- assert(e);
- assert(i);
-
- for (a = e->announcers; a; a = a->by_entry_next)
- if (a->interface == i)
- return a;
-
- return NULL;
-}
-
-static void go_to_initial_state(AvahiAnnouncer *a) {
- AvahiEntry *e;
- struct timeval tv;
-
- assert(a);
- e = a->entry;
-
- if ((e->flags & AVAHI_PUBLISH_UNIQUE) && !(e->flags & AVAHI_PUBLISH_NO_PROBE))
- a->state = AVAHI_PROBING;
- else if (!(e->flags & AVAHI_PUBLISH_NO_ANNOUNCE)) {
-
- if (!e->group || e->group->state == AVAHI_ENTRY_GROUP_ESTABLISHED)
- a->state = AVAHI_ANNOUNCING;
- else
- a->state = AVAHI_WAITING;
-
- } else
- a->state = AVAHI_ESTABLISHED;
-
- a->n_iteration = 1;
- a->sec_delay = 1;
-
- if (a->state == AVAHI_PROBING && e->group)
- e->group->n_probing++;
-
- if (a->state == AVAHI_PROBING)
- set_timeout(a, avahi_elapse_time(&tv, 0, AVAHI_PROBE_JITTER_MSEC));
- else if (a->state == AVAHI_ANNOUNCING)
- set_timeout(a, avahi_elapse_time(&tv, 0, AVAHI_ANNOUNCEMENT_JITTER_MSEC));
- else
- set_timeout(a, NULL);
-}
-
-static void new_announcer(AvahiServer *s, AvahiInterface *i, AvahiEntry *e) {
- AvahiAnnouncer *a;
-
- assert(s);
- assert(i);
- assert(e);
- assert(!e->dead);
-
- if (!avahi_interface_match(i, e->interface, e->protocol) || !i->announcing || !avahi_entry_is_commited(e))
- return;
-
- /* We don't want duplicate announcers */
- if (get_announcer(s, e, i))
- return;
-
- if ((!(a = avahi_new(AvahiAnnouncer, 1)))) {
- avahi_log_error(__FILE__": Out of memory.");
- return;
- }
-
- a->server = s;
- a->interface = i;
- a->entry = e;
- a->time_event = NULL;
-
- AVAHI_LLIST_PREPEND(AvahiAnnouncer, by_interface, i->announcers, a);
- AVAHI_LLIST_PREPEND(AvahiAnnouncer, by_entry, e->announcers, a);
-
- go_to_initial_state(a);
-}
-
-void avahi_announce_interface(AvahiServer *s, AvahiInterface *i) {
- AvahiEntry *e;
-
- assert(s);
- assert(i);
-
- if (!i->announcing)
- return;
-
- for (e = s->entries; e; e = e->entries_next)
- if (!e->dead)
- new_announcer(s, i, e);
-}
-
-static void announce_walk_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, void* userdata) {
- AvahiEntry *e = userdata;
-
- assert(m);
- assert(i);
- assert(e);
- assert(!e->dead);
-
- new_announcer(m->server, i, e);
-}
-
-void avahi_announce_entry(AvahiServer *s, AvahiEntry *e) {
- assert(s);
- assert(e);
- assert(!e->dead);
-
- avahi_interface_monitor_walk(s->monitor, e->interface, e->protocol, announce_walk_callback, e);
-}
-
-void avahi_announce_group(AvahiServer *s, AvahiSEntryGroup *g) {
- AvahiEntry *e;
-
- assert(s);
- assert(g);
-
- for (e = g->entries; e; e = e->by_group_next)
- if (!e->dead)
- avahi_announce_entry(s, e);
-}
-
-int avahi_entry_is_registered(AvahiServer *s, AvahiEntry *e, AvahiInterface *i) {
- AvahiAnnouncer *a;
-
- assert(s);
- assert(e);
- assert(i);
- assert(!e->dead);
-
- if (!(a = get_announcer(s, e, i)))
- return 0;
-
- return
- a->state == AVAHI_ANNOUNCING ||
- a->state == AVAHI_ESTABLISHED ||
- (a->state == AVAHI_WAITING && !(e->flags & AVAHI_PUBLISH_UNIQUE));
-}
-
-int avahi_entry_is_probing(AvahiServer *s, AvahiEntry *e, AvahiInterface *i) {
- AvahiAnnouncer *a;
-
- assert(s);
- assert(e);
- assert(i);
- assert(!e->dead);
-
- if (!(a = get_announcer(s, e, i)))
- return 0;
-
- return
- a->state == AVAHI_PROBING ||
- (a->state == AVAHI_WAITING && (e->flags & AVAHI_PUBLISH_UNIQUE));
-}
-
-void avahi_entry_return_to_initial_state(AvahiServer *s, AvahiEntry *e, AvahiInterface *i) {
- AvahiAnnouncer *a;
-
- assert(s);
- assert(e);
- assert(i);
-
- if (!(a = get_announcer(s, e, i)))
- return;
-
- if (a->state == AVAHI_PROBING && a->entry->group)
- a->entry->group->n_probing--;
-
- go_to_initial_state(a);
-}
-
-static AvahiRecord *make_goodbye_record(AvahiRecord *r) {
- AvahiRecord *g;
-
- assert(r);
-
- if (!(g = avahi_record_copy(r)))
- return NULL; /* OOM */
-
- assert(g->ref == 1);
- g->ttl = 0;
-
- return g;
-}
-
-static int is_duplicate_entry(AvahiServer *s, AvahiEntry *e) {
- AvahiEntry *i;
-
- assert(s);
- assert(e);
-
- for (i = avahi_hashmap_lookup(s->entries_by_key, e->record->key); i; i = i->by_key_next) {
-
- if ((i == e) || (i->dead))
- continue;
-
- if (!avahi_record_equal_no_ttl(i->record, e->record))
- continue;
-
- return 1;
- }
-
- return 0;
-}
-
-static void send_goodbye_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, void* userdata) {
- AvahiEntry *e = userdata;
- AvahiRecord *g;
-
- assert(m);
- assert(i);
- assert(e);
- assert(!e->dead);
-
- if (!avahi_interface_match(i, e->interface, e->protocol))
- return;
-
- if (e->flags & AVAHI_PUBLISH_NO_ANNOUNCE)
- return;
-
- if (!avahi_entry_is_registered(m->server, e, i))
- return;
-
- if (is_duplicate_entry(m->server, e))
- return;
-
- if (!(g = make_goodbye_record(e->record)))
- return; /* OOM */
-
- avahi_interface_post_response(i, g, e->flags & AVAHI_PUBLISH_UNIQUE, NULL, 1);
- avahi_record_unref(g);
-}
-
-static void reannounce(AvahiAnnouncer *a) {
- AvahiEntry *e;
- struct timeval tv;
-
- assert(a);
- e = a->entry;
-
- /* If the group this entry belongs to is not even commited, there's nothing to reannounce */
- if (e->group && (e->group->state == AVAHI_ENTRY_GROUP_UNCOMMITED || e->group->state == AVAHI_ENTRY_GROUP_COLLISION))
- return;
-
- /* Because we might change state we decrease the probing counter first */
- if (a->state == AVAHI_PROBING && a->entry->group)
- a->entry->group->n_probing--;
-
- if (a->state == AVAHI_PROBING ||
- (a->state == AVAHI_WAITING && (e->flags & AVAHI_PUBLISH_UNIQUE) && !(e->flags & AVAHI_PUBLISH_NO_PROBE)))
-
- /* We were probing or waiting after probe, so we restart probing from the beginning here */
-
- a->state = AVAHI_PROBING;
- else if (a->state == AVAHI_WAITING)
-
- /* We were waiting, but were not probing before, so we continue waiting */
- a->state = AVAHI_WAITING;
-
- else if (e->flags & AVAHI_PUBLISH_NO_ANNOUNCE)
-
- /* No announcer needed */
- a->state = AVAHI_ESTABLISHED;
-
- else {
-
- /* Ok, let's restart announcing */
- a->state = AVAHI_ANNOUNCING;
- }
-
- /* Now let's increase the probing counter again */
- if (a->state == AVAHI_PROBING && e->group)
- e->group->n_probing++;
-
- a->n_iteration = 1;
- a->sec_delay = 1;
-
- if (a->state == AVAHI_PROBING)
- set_timeout(a, avahi_elapse_time(&tv, 0, AVAHI_PROBE_JITTER_MSEC));
- else if (a->state == AVAHI_ANNOUNCING)
- set_timeout(a, avahi_elapse_time(&tv, 0, AVAHI_ANNOUNCEMENT_JITTER_MSEC));
- else
- set_timeout(a, NULL);
-}
-
-
-static void reannounce_walk_callback(AvahiInterfaceMonitor *m, AvahiInterface *i, void* userdata) {
- AvahiEntry *e = userdata;
- AvahiAnnouncer *a;
-
- assert(m);
- assert(i);
- assert(e);
- assert(!e->dead);
-
- if (!(a = get_announcer(m->server, e, i)))
- return;
-
- reannounce(a);
-}
-
-void avahi_reannounce_entry(AvahiServer *s, AvahiEntry *e) {
-
- assert(s);
- assert(e);
- assert(!e->dead);
-
- avahi_interface_monitor_walk(s->monitor, e->interface, e->protocol, reannounce_walk_callback, e);
-}
-
-void avahi_goodbye_interface(AvahiServer *s, AvahiInterface *i, int send_goodbye, int remove) {
- assert(s);
- assert(i);
-
- if (send_goodbye)
- if (i->announcing) {
- AvahiEntry *e;
-
- for (e = s->entries; e; e = e->entries_next)
- if (!e->dead)
- send_goodbye_callback(s->monitor, i, e);
- }
-
- if (remove)
- while (i->announcers)
- remove_announcer(s, i->announcers);
-}
-
-void avahi_goodbye_entry(AvahiServer *s, AvahiEntry *e, int send_goodbye, int remove) {
- assert(s);
- assert(e);
-
- if (send_goodbye)
- if (!e->dead)
- avahi_interface_monitor_walk(s->monitor, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, send_goodbye_callback, e);
-
- if (remove)
- while (e->announcers)
- remove_announcer(s, e->announcers);
-}
-
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