--- /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 <string.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <avahi/domain.h>
+#include <avahi/timeval.h>
+#include <avahi/malloc.h>
+#include <avahi/error.h>
+
+#include "browse.h"
+#include <avahi/log.h>
+
+#define TIMEOUT_MSEC 5000
+
+struct AvahiSServiceResolver {
+ AvahiServer *server;
+ char *service_name;
+ char *service_type;
+ char *domain_name;
+ AvahiProtocol address_protocol;
+
+ AvahiIfIndex interface;
+ AvahiProtocol protocol;
+
+ AvahiSRecordBrowser *record_browser_srv;
+ AvahiSRecordBrowser *record_browser_txt;
+ AvahiSRecordBrowser *record_browser_a;
+ AvahiSRecordBrowser *record_browser_aaaa;
+
+ AvahiRecord *srv_record, *txt_record, *address_record;
+ AvahiLookupResultFlags srv_flags, txt_flags, address_flags;
+
+ AvahiSServiceResolverCallback callback;
+ void* userdata;
+ AvahiLookupFlags user_flags;
+
+ AvahiTimeEvent *time_event;
+
+ AVAHI_LLIST_FIELDS(AvahiSServiceResolver, resolver);
+};
+
+static void finish(AvahiSServiceResolver *r, AvahiResolverEvent event) {
+ AvahiLookupResultFlags flags;
+
+ assert(r);
+
+ if (r->time_event) {
+ avahi_time_event_free(r->time_event);
+ r->time_event = NULL;
+ }
+
+ flags =
+ r->txt_flags |
+ r->srv_flags |
+ r->address_flags;
+
+ switch (event) {
+ case AVAHI_RESOLVER_FAILURE:
+
+ r->callback(
+ r,
+ r->interface,
+ r->protocol,
+ event,
+ r->service_name,
+ r->service_type,
+ r->domain_name,
+ NULL,
+ NULL,
+ 0,
+ NULL,
+ flags,
+ r->userdata);
+
+ break;
+
+ case AVAHI_RESOLVER_FOUND: {
+ AvahiAddress a;
+
+ assert(event == AVAHI_RESOLVER_FOUND);
+
+ assert(r->srv_record);
+
+ if (r->address_record) {
+ switch (r->address_record->key->type) {
+ case AVAHI_DNS_TYPE_A:
+ a.proto = AVAHI_PROTO_INET;
+ a.data.ipv4 = r->address_record->data.a.address;
+ break;
+
+ case AVAHI_DNS_TYPE_AAAA:
+ a.proto = AVAHI_PROTO_INET6;
+ a.data.ipv6 = r->address_record->data.aaaa.address;
+ break;
+
+ default:
+ assert(0);
+ }
+ }
+
+ r->callback(
+ r,
+ r->interface,
+ r->protocol,
+ event,
+ r->service_name,
+ r->service_type,
+ r->domain_name,
+ r->srv_record->data.srv.name,
+ r->address_record ? &a : NULL,
+ r->srv_record->data.srv.port,
+ r->txt_record ? r->txt_record->data.txt.string_list : NULL,
+ flags,
+ r->userdata);
+
+ break;
+ }
+ }
+}
+
+static void time_event_callback(AvahiTimeEvent *e, void *userdata) {
+ AvahiSServiceResolver *r = userdata;
+
+ assert(e);
+ assert(r);
+
+ avahi_server_set_errno(r->server, AVAHI_ERR_TIMEOUT);
+ finish(r, AVAHI_RESOLVER_FAILURE);
+}
+
+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,
+ 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;
+ }
+}
+
+AvahiSServiceResolver *avahi_s_service_resolver_new(
+ AvahiServer *server,
+ AvahiIfIndex interface,
+ AvahiProtocol protocol,
+ const char *name,
+ const char *type,
+ const char *domain,
+ AvahiProtocol aprotocol,
+ AvahiLookupFlags flags,
+ AvahiSServiceResolverCallback callback,
+ void* userdata) {
+
+ AvahiSServiceResolver *r;
+ AvahiKey *k;
+ char n[AVAHI_DOMAIN_NAME_MAX];
+ int ret;
+
+ assert(server);
+ assert(type);
+ assert(callback);
+
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_IF_VALID(interface), AVAHI_ERR_INVALID_INTERFACE);
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(protocol), AVAHI_ERR_INVALID_PROTOCOL);
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_PROTO_VALID(aprotocol), AVAHI_ERR_INVALID_PROTOCOL);
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !domain || avahi_is_valid_domain_name(domain), AVAHI_ERR_INVALID_DOMAIN_NAME);
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, !name || avahi_is_valid_service_name(name), AVAHI_ERR_INVALID_SERVICE_NAME);
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, avahi_is_valid_service_type_strict(type), AVAHI_ERR_INVALID_SERVICE_TYPE);
+ AVAHI_CHECK_VALIDITY_RETURN_NULL(server, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST|AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), AVAHI_ERR_INVALID_FLAGS);
+
+ if (!domain)
+ domain = server->domain_name;
+
+ if ((ret = avahi_service_name_join(n, sizeof(n), name, type, domain)) < 0) {
+ avahi_server_set_errno(server, ret);
+ return NULL;
+ }
+
+ if (!(r = avahi_new(AvahiSServiceResolver, 1))) {
+ avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
+ return NULL;
+ }
+
+ r->server = server;
+ r->service_name = avahi_strdup(name);
+ r->service_type = avahi_normalize_name_strdup(type);
+ r->domain_name = avahi_normalize_name_strdup(domain);
+ r->callback = callback;
+ r->userdata = userdata;
+ r->address_protocol = aprotocol;
+ r->srv_record = r->txt_record = r->address_record = NULL;
+ r->srv_flags = r->txt_flags = r->address_flags = 0;
+ r->interface = interface;
+ r->protocol = protocol;
+ r->user_flags = flags;
+ r->record_browser_a = r->record_browser_aaaa = r->record_browser_srv = r->record_browser_txt = NULL;
+ r->time_event = NULL;
+ AVAHI_LLIST_PREPEND(AvahiSServiceResolver, resolver, server->service_resolvers, r);
+
+ k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV);
+ r->record_browser_srv = avahi_s_record_browser_new(server, interface, protocol, k, flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r);
+ avahi_key_unref(k);
+
+ if (!r->record_browser_srv) {
+ avahi_s_service_resolver_free(r);
+ return NULL;
+ }
+
+ if (!(flags & AVAHI_LOOKUP_NO_TXT)) {
+ k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_TXT);
+ r->record_browser_txt = avahi_s_record_browser_new(server, interface, protocol, k, flags & ~(AVAHI_LOOKUP_NO_TXT|AVAHI_LOOKUP_NO_ADDRESS), record_browser_callback, r);
+ avahi_key_unref(k);
+
+ if (!r->record_browser_txt) {
+ avahi_s_service_resolver_free(r);
+ return NULL;
+ }
+ }
+
+ start_timeout(r);
+
+ return r;
+}
+
+void avahi_s_service_resolver_free(AvahiSServiceResolver *r) {
+ assert(r);
+
+ AVAHI_LLIST_REMOVE(AvahiSServiceResolver, resolver, r->server->service_resolvers, r);
+
+ if (r->time_event)
+ avahi_time_event_free(r->time_event);
+
+ 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);
+
+ if (r->srv_record)
+ avahi_record_unref(r->srv_record);
+ if (r->txt_record)
+ avahi_record_unref(r->txt_record);
+ if (r->address_record)
+ avahi_record_unref(r->address_record);
+
+ avahi_free(r->service_name);
+ avahi_free(r->service_type);
+ avahi_free(r->domain_name);
+ avahi_free(r);
+}
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