static void run_callbacks(AvahiWideAreaLookupEngine *e, AvahiRecord *r) {
AvahiWideAreaLookup *l;
assert(e);
assert(r);
for (l = avahi_hashmap_lookup(e->lookups_by_key, r->key); l; l = l->by_key_next) {
if (l->dead || !l->callback)
continue;
l->callback(e, AVAHI_BROWSER_NEW, AVAHI_LOOKUP_RESULT_WIDE_AREA, r, l->userdata);
}
if (r->key->clazz == AVAHI_DNS_CLASS_IN && r->key->type == AVAHI_DNS_TYPE_CNAME) {
/* It's a CNAME record, so we have to scan the all lookups to see if one matches */
for (l = e->lookups; l; l = l->lookups_next) {
AvahiKey *key;
if (l->dead || !l->callback)
continue;
if ((key = avahi_key_new_cname(l->key))) {
if (avahi_key_equal(r->key, key))
l->callback(e, AVAHI_BROWSER_NEW, AVAHI_LOOKUP_RESULT_WIDE_AREA, r, l->userdata);
avahi_key_unref(key);
}
}
}
}
static void lookup_drop_cname(AvahiSRBLookup *l, AvahiIfIndex interface, AvahiProtocol protocol, AvahiLookupFlags flags, AvahiRecord *r) {
AvahiKey *k;
AvahiSRBLookup *n = NULL;
AvahiRList *rl;
assert(r->key->clazz == AVAHI_DNS_CLASS_IN);
assert(r->key->type == AVAHI_DNS_TYPE_CNAME);
k = avahi_key_new(r->data.ptr.name, l->record_browser->key->clazz, l->record_browser->key->type);
for (rl = l->cname_lookups; rl; rl = rl->rlist_next) {
n = rl->data;
assert(n);
if ((n->interface == AVAHI_IF_UNSPEC || n->interface == interface) &&
(n->interface == AVAHI_PROTO_UNSPEC || n->protocol == protocol) &&
n->flags == flags &&
avahi_key_equal(n->key, k))
break;
}
avahi_key_unref(k);
if (rl) {
l->cname_lookups = avahi_rlist_remove_by_link(l->cname_lookups, rl);
lookup_unref(n);
}
}
static void lookup_wide_area_callback(
AvahiWideAreaLookupEngine *e,
AvahiBrowserEvent event,
AvahiLookupResultFlags flags,
AvahiRecord *r,
void *userdata) {
AvahiSRBLookup *l = userdata;
AvahiSRecordBrowser *b;
assert(e);
assert(l);
assert(l->ref >= 1);
b = l->record_browser;
if (b->dead)
return;
lookup_ref(l);
switch (event) {
case AVAHI_BROWSER_NEW:
assert(r);
if (r->key->clazz == AVAHI_DNS_CLASS_IN &&
r->key->type == AVAHI_DNS_TYPE_CNAME)
/* It's a CNAME record, so let's follow it. We only follow it on wide area DNS! */
lookup_handle_cname(l, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, AVAHI_LOOKUP_USE_WIDE_AREA, r);
else {
/* It's a normal record, so let's call the user callback */
assert(avahi_key_equal(r->key, l->key));
b->callback(b, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, event, r, flags, b->userdata);
}
break;
case AVAHI_BROWSER_REMOVE:
case AVAHI_BROWSER_CACHE_EXHAUSTED:
/* Not defined for wide area DNS */
abort();
case AVAHI_BROWSER_ALL_FOR_NOW:
case AVAHI_BROWSER_FAILURE:
b->callback(b, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, event, NULL, flags, b->userdata);
break;
}
lookup_unref(l);
}
static AvahiQueryJob* find_scheduled_job(AvahiQueryScheduler *s, AvahiKey *key) {
AvahiQueryJob *qj;
assert(s);
assert(key);
for (qj = s->jobs; qj; qj = qj->jobs_next) {
assert(!qj->done);
if (avahi_key_equal(qj->key, key))
return qj;
}
return NULL;
}
static AvahiSRBLookup *lookup_find(
AvahiSRecordBrowser *b,
AvahiIfIndex interface,
AvahiProtocol protocol,
AvahiLookupFlags flags,
AvahiKey *key) {
AvahiSRBLookup *l;
assert(b);
for (l = b->lookups; l; l = l->lookups_next) {
if ((l->interface == AVAHI_IF_UNSPEC || l->interface == interface) &&
(l->interface == AVAHI_PROTO_UNSPEC || l->protocol == protocol) &&
l->flags == flags &&
avahi_key_equal(l->key, key))
return l;
}
return NULL;
}
static AvahiQueryJob* find_history_job(AvahiQueryScheduler *s, AvahiKey *key) {
AvahiQueryJob *qj;
assert(s);
assert(key);
for (qj = s->history; qj; qj = qj->jobs_next) {
assert(qj->done);
if (avahi_key_equal(qj->key, key)) {
/* Check whether this entry is outdated */
if (avahi_age(&qj->delivery) > AVAHI_QUERY_HISTORY_MSEC*1000) {
/* it is outdated, so let's remove it */
job_free(s, qj);
return NULL;
}
return qj;
}
}
return NULL;
}
static void lookup_multicast_callback(
AvahiMulticastLookupEngine *e,
AvahiIfIndex interface,
AvahiProtocol protocol,
AvahiBrowserEvent event,
AvahiLookupResultFlags flags,
AvahiRecord *r,
void *userdata) {
AvahiSRBLookup *l = userdata;
AvahiSRecordBrowser *b;
assert(e);
assert(l);
b = l->record_browser;
if (b->dead)
return;
lookup_ref(l);
switch (event) {
case AVAHI_BROWSER_NEW:
assert(r);
if (r->key->clazz == AVAHI_DNS_CLASS_IN &&
r->key->type == AVAHI_DNS_TYPE_CNAME)
/* It's a CNAME record, so let's follow it. We allow browsing on both multicast and wide area. */
lookup_handle_cname(l, interface, protocol, b->flags, r);
else {
/* It's a normal record, so let's call the user callback */
if (avahi_server_is_record_local(b->server, interface, protocol, r))
flags |= AVAHI_LOOKUP_RESULT_LOCAL;
b->callback(b, interface, protocol, event, r, flags, b->userdata);
}
break;
case AVAHI_BROWSER_REMOVE:
assert(r);
if (r->key->clazz == AVAHI_DNS_CLASS_IN &&
r->key->type == AVAHI_DNS_TYPE_CNAME)
/* It's a CNAME record, so let's drop that query! */
lookup_drop_cname(l, interface, protocol, 0, r);
else {
/* It's a normal record, so let's call the user callback */
assert(avahi_key_equal(b->key, l->key));
b->callback(b, interface, protocol, event, r, flags, b->userdata);
}
break;
case AVAHI_BROWSER_ALL_FOR_NOW:
b->callback(b, AVAHI_IF_UNSPEC, AVAHI_PROTO_UNSPEC, event, NULL, flags, b->userdata);
break;
case AVAHI_BROWSER_CACHE_EXHAUSTED:
case AVAHI_BROWSER_FAILURE:
/* Not defined for multicast DNS */
abort();
}
lookup_unref(l);
}