+++ /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-common/domain.h>
-#include <avahi-common/timeval.h>
-#include <avahi-common/malloc.h>
-#include <avahi-common/error.h>
-
-#include "browse.h"
-#include "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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