#include <string.h>
#include <stdio.h>
+#include <stdlib.h>
#include <avahi-common/domain.h>
#include <avahi-common/timeval.h>
#include "browse.h"
+#define TIMEOUT_MSEC 1000
+
struct AvahiSServiceResolver {
AvahiServer *server;
char *service_name;
static void finish(AvahiSServiceResolver *r, AvahiResolverEvent event) {
assert(r);
- 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->record_browser_srv) {
- avahi_s_record_browser_free(r->record_browser_srv);
- r->record_browser_srv = NULL;
- }
-
- if (r->record_browser_txt) {
- avahi_s_record_browser_free(r->record_browser_txt);
- r->record_browser_txt = NULL;
- }
-
if (r->time_event) {
avahi_time_event_free(r->time_event);
r->time_event = NULL;
AvahiAddress a;
char sn[256], st[256];
size_t i;
+
+ assert(event == AVAHI_RESOLVER_FOUND);
assert(r->srv_record);
assert(r->txt_record);
}
}
+static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
+ AvahiSServiceResolver *r = userdata;
+
+ assert(e);
+ assert(r);
+
+ finish(r, AVAHI_RESOLVER_TIMEOUT);
+}
+
+static void start_timeout(AvahiSServiceResolver *r) {
+ struct timeval tv;
+ assert(r);
+
+ if (r->time_event)
+ return;
+
+ avahi_elapse_time(&tv, TIMEOUT_MSEC, 0);
+ r->time_event = avahi_time_event_new(r->server->time_event_queue, &tv, time_event_callback, r);
+}
+
static void record_browser_callback(AvahiSRecordBrowser*rr, AvahiIfIndex interface, AvahiProtocol protocol, AvahiBrowserEvent event, AvahiRecord *record, void* userdata) {
AvahiSServiceResolver *r = userdata;
assert(record);
assert(r);
- if (!(event == AVAHI_BROWSER_NEW))
- return;
+ if (event == AVAHI_BROWSER_NEW) {
+ int changed = 0;
- if (r->interface > 0 && interface != r->interface)
- return;
+ 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;
+
+ 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->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, 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, record_browser_callback, r);
+ avahi_key_unref(k);
+ }
+ }
+ break;
+
+ case AVAHI_DNS_TYPE_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:
+ if (!r->address_record) {
+ r->address_record = avahi_record_ref(record);
+ changed = 1;
+ }
+ break;
+
+ default:
+ abort();
+ }
- 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;
-
- switch (record->key->type) {
- case AVAHI_DNS_TYPE_SRV:
- if (!r->srv_record) {
- r->srv_record = avahi_record_ref(record);
+ if (changed && r->txt_record && r->srv_record && r->address_record)
+ finish(r, AVAHI_RESOLVER_FOUND);
- assert(!r->record_browser_a && !r->record_browser_aaaa);
-
- 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, record_browser_callback, r);
- avahi_key_unref(k);
- }
+ } else {
+ assert(event == AVAHI_BROWSER_REMOVE);
+
+
+ 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;
+
+ /** Look for a replacement */
+ avahi_s_record_browser_restart(r->record_browser_srv);
+ start_timeout(r);
+ }
- 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, record_browser_callback, r);
- avahi_key_unref(k);
+ break;
+
+ case AVAHI_DNS_TYPE_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_TXT:
- if (!r->txt_record)
- r->txt_record = avahi_record_ref(record);
- break;
-
- case AVAHI_DNS_TYPE_A:
- case AVAHI_DNS_TYPE_AAAA:
- if (!r->address_record)
- r->address_record = avahi_record_ref(record);
- break;
-
- default:
- assert(0);
- }
+ break;
- if (r->txt_record && r->srv_record && r->address_record)
- finish(r, AVAHI_RESOLVER_FOUND);
-}
+ case AVAHI_DNS_TYPE_A:
+ case AVAHI_DNS_TYPE_AAAA:
-static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
- AvahiSServiceResolver *r = userdata;
-
- assert(e);
- assert(r);
+ if (r->address_record && avahi_record_equal_no_ttl(record, r->address_record)) {
+ avahi_record_unref(r->address_record);
+ r->address_record = NULL;
- finish(r, AVAHI_RESOLVER_TIMEOUT);
+ /** 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();
+ }
+ }
}
AvahiSServiceResolver *avahi_s_service_resolver_new(AvahiServer *server, AvahiIfIndex interface, AvahiProtocol protocol, const char *name, const char *type, const char *domain, AvahiProtocol aprotocol, AvahiSServiceResolverCallback callback, void* userdata) {
AvahiSServiceResolver *r;
AvahiKey *k;
- struct timeval tv;
char t[256], *n;
size_t l;
avahi_escape_label((const uint8_t*) name, strlen(name), &n, &l);
snprintf(n, l, ".%s.%s", r->service_type, r->domain_name);
- avahi_elapse_time(&tv, 1000, 0);
- r->time_event = avahi_time_event_new(server->time_event_queue, &tv, time_event_callback, r);
+ r->time_event = NULL;
+ start_timeout(r);
AVAHI_LLIST_PREPEND(AvahiSServiceResolver, resolver, server->service_resolvers, r);
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