static void record_browser_callback(
AvahiSRecordBrowser*rr,
AvahiIfIndex interface,
AvahiProtocol protocol,
AvahiBrowserEvent event,
AvahiRecord *record,
AvahiLookupResultFlags flags,
void* userdata) {
AvahiSServiceResolver *r = userdata;
assert(rr);
assert(r);
if (rr == r->record_browser_aaaa || rr == r->record_browser_a)
r->address_flags = flags;
else if (rr == r->record_browser_srv)
r->srv_flags = flags;
else if (rr == r->record_browser_txt)
r->txt_flags = flags;
switch (event) {
case AVAHI_BROWSER_NEW: {
int changed = 0;
assert(record);
if (r->interface > 0 && interface > 0 && interface != r->interface)
return;
if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
return;
if (r->interface <= 0)
r->interface = interface;
if (r->protocol == AVAHI_PROTO_UNSPEC)
r->protocol = protocol;
switch (record->key->type) {
case AVAHI_DNS_TYPE_SRV:
if (!r->srv_record) {
r->srv_record = avahi_record_ref(record);
changed = 1;
if (r->record_browser_a) {
avahi_s_record_browser_free(r->record_browser_a);
r->record_browser_a = NULL;
}
if (r->record_browser_aaaa) {
avahi_s_record_browser_free(r->record_browser_aaaa);
r->record_browser_aaaa = NULL;
}
if (!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS)) {
if (r->address_protocol == AVAHI_PROTO_INET || r->address_protocol == AVAHI_PROTO_UNSPEC) {
AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_A);
r->record_browser_a = avahi_s_record_browser_new(r->server, r->interface, r->protocol, k, r->user_flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r);
avahi_key_unref(k);
}
if (r->address_protocol == AVAHI_PROTO_INET6 || r->address_protocol == AVAHI_PROTO_UNSPEC) {
AvahiKey *k = avahi_key_new(r->srv_record->data.srv.name, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_AAAA);
r->record_browser_aaaa = avahi_s_record_browser_new(r->server, r->interface, r->protocol, k, r->user_flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r);
avahi_key_unref(k);
}
}
}
break;
case AVAHI_DNS_TYPE_TXT:
assert(!(r->user_flags & AVAHI_LOOKUP_NO_TXT));
if (!r->txt_record) {
r->txt_record = avahi_record_ref(record);
changed = 1;
}
break;
case AVAHI_DNS_TYPE_A:
case AVAHI_DNS_TYPE_AAAA:
assert(!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS));
if (!r->address_record) {
r->address_record = avahi_record_ref(record);
changed = 1;
}
break;
default:
abort();
}
if (changed &&
r->srv_record &&
(r->txt_record || (r->user_flags & AVAHI_LOOKUP_NO_TXT)) &&
(r->address_record || (r->user_flags & AVAHI_LOOKUP_NO_ADDRESS)))
finish(r, AVAHI_RESOLVER_FOUND);
break;
}
case AVAHI_BROWSER_REMOVE:
assert(record);
switch (record->key->type) {
case AVAHI_DNS_TYPE_SRV:
if (r->srv_record && avahi_record_equal_no_ttl(record, r->srv_record)) {
avahi_record_unref(r->srv_record);
r->srv_record = NULL;
if (r->record_browser_a) {
avahi_s_record_browser_free(r->record_browser_a);
r->record_browser_a = NULL;
}
if (r->record_browser_aaaa) {
avahi_s_record_browser_free(r->record_browser_aaaa);
r->record_browser_aaaa = NULL;
}
/** Look for a replacement */
avahi_s_record_browser_restart(r->record_browser_srv);
start_timeout(r);
}
break;
case AVAHI_DNS_TYPE_TXT:
assert(!(r->user_flags & AVAHI_LOOKUP_NO_TXT));
if (r->txt_record && avahi_record_equal_no_ttl(record, r->txt_record)) {
avahi_record_unref(r->txt_record);
r->txt_record = NULL;
/** Look for a replacement */
avahi_s_record_browser_restart(r->record_browser_txt);
start_timeout(r);
}
break;
case AVAHI_DNS_TYPE_A:
case AVAHI_DNS_TYPE_AAAA:
assert(!(r->user_flags & AVAHI_LOOKUP_NO_ADDRESS));
if (r->address_record && avahi_record_equal_no_ttl(record, r->address_record)) {
avahi_record_unref(r->address_record);
r->address_record = NULL;
/** Look for a replacement */
if (r->record_browser_aaaa)
avahi_s_record_browser_restart(r->record_browser_aaaa);
if (r->record_browser_a)
avahi_s_record_browser_restart(r->record_browser_a);
start_timeout(r);
}
break;
default:
abort();
}
break;
case AVAHI_BROWSER_CACHE_EXHAUSTED:
case AVAHI_BROWSER_ALL_FOR_NOW:
break;
case AVAHI_BROWSER_FAILURE:
if (rr == r->record_browser_a && r->record_browser_aaaa) {
/* We were looking for both AAAA and A, and the other query is still living, so we'll not die */
avahi_s_record_browser_free(r->record_browser_a);
r->record_browser_a = NULL;
break;
}
if (rr == r->record_browser_aaaa && r->record_browser_a) {
/* We were looking for both AAAA and A, and the other query is still living, so we'll not die */
avahi_s_record_browser_free(r->record_browser_aaaa);
r->record_browser_aaaa = NULL;
break;
}
/* Hmm, everything's lost, tell the user */
if (r->record_browser_srv)
avahi_s_record_browser_free(r->record_browser_srv);
if (r->record_browser_txt)
avahi_s_record_browser_free(r->record_browser_txt);
if (r->record_browser_a)
avahi_s_record_browser_free(r->record_browser_a);
if (r->record_browser_aaaa)
avahi_s_record_browser_free(r->record_browser_aaaa);
r->record_browser_srv = r->record_browser_txt = r->record_browser_a = r->record_browser_aaaa = NULL;
finish(r, AVAHI_RESOLVER_FAILURE);
break;
}
}
static void record_browser_callback(
AvahiSRecordBrowser*rr,
AvahiIfIndex interface,
AvahiProtocol protocol,
AvahiBrowserEvent event,
AvahiRecord *record,
AvahiLookupResultFlags flags,
void* userdata) {
AvahiSAddressResolver *r = userdata;
assert(rr);
assert(r);
switch (event) {
case AVAHI_BROWSER_NEW:
assert(record);
assert(record->key->type == AVAHI_DNS_TYPE_PTR);
if (flags & AVAHI_LOOKUP_RESULT_LLMNR)
r->llmnr_has_record = 1;
if (r->interface > 0 && interface != r->interface)
return;
if (r->protocol != AVAHI_PROTO_UNSPEC && protocol != r->protocol)
return;
if (r->interface <= 0)
r->interface = interface;
if (r->protocol == AVAHI_PROTO_UNSPEC)
r->protocol = protocol;
if (!r->ptr_record) {
r->ptr_record = avahi_record_ref(record);
r->flags = flags;
finish(r, AVAHI_RESOLVER_FOUND);
}
break;
case AVAHI_BROWSER_REMOVE:
assert(record);
assert(record->key->type == AVAHI_DNS_TYPE_PTR);
if (r->ptr_record && avahi_record_equal_no_ttl(record, r->ptr_record)) {
avahi_record_unref(r->ptr_record);
r->ptr_record = NULL;
r->flags = flags;
/** Look for a replacement */
avahi_s_record_browser_restart(r->record_browser);
start_timeout(r);
}
break;
case AVAHI_BROWSER_CACHE_EXHAUSTED:
break;
case AVAHI_BROWSER_ALL_FOR_NOW:
/* when called by _LLMNR we trigger lookup by _MULTICAST*/
if ((flags & AVAHI_LOOKUP_RESULT_LLMNR) && (r->retry_with_multicast) && !r->llmnr_has_record) {
r->retry_with_multicast = 0;
avahi_s_record_browser_free(r->record_browser);
r->record_browser = avahi_s_record_browser_new(r->server, r->interface, r->protocol, r->key, AVAHI_LOOKUP_USE_MULTICAST, record_browser_callback, r);
if (r->record_browser) {
start_timeout(r);
break;
}
}
break;
case AVAHI_BROWSER_FAILURE:
if (r->retry_with_llmnr) {
r->retry_with_llmnr = 0;
avahi_s_record_browser_free(r->record_browser);
r->record_browser = avahi_s_record_browser_new(r->server, r->interface, r->protocol, r->key, AVAHI_LOOKUP_USE_LLMNR, record_browser_callback, r);
if (r->record_browser) {
start_timeout(r);
break;
}
}
break;
}
}
