+++ /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 <avahi-common/domain.h>
-#include <avahi-common/malloc.h>
-#include <avahi-common/error.h>
-
-#include "browse.h"
-#include "log.h"
-#include "rr.h"
-
-typedef struct AvahiDNSServerInfo AvahiDNSServerInfo;
-
-struct AvahiDNSServerInfo {
- AvahiSDNSServerBrowser *browser;
-
- AvahiIfIndex interface;
- AvahiProtocol protocol;
- AvahiRecord *srv_record;
- AvahiSHostNameResolver *host_name_resolver;
- AvahiAddress address;
- AvahiLookupResultFlags flags;
-
- AVAHI_LLIST_FIELDS(AvahiDNSServerInfo, info);
-};
-
-struct AvahiSDNSServerBrowser {
- AvahiServer *server;
-
- AvahiSRecordBrowser *record_browser;
- AvahiSDNSServerBrowserCallback callback;
- void* userdata;
- AvahiProtocol aprotocol;
- AvahiLookupFlags user_flags;
-
- unsigned n_info;
-
- AVAHI_LLIST_FIELDS(AvahiSDNSServerBrowser, browser);
- AVAHI_LLIST_HEAD(AvahiDNSServerInfo, info);
-};
-
-static AvahiDNSServerInfo* get_server_info(AvahiSDNSServerBrowser *b, AvahiIfIndex interface, AvahiProtocol protocol, AvahiRecord *r) {
- AvahiDNSServerInfo *i;
-
- assert(b);
- assert(r);
-
- for (i = b->info; i; i = i->info_next)
- if (i->interface == interface &&
- i->protocol == protocol &&
- avahi_record_equal_no_ttl(r, i->srv_record))
- return i;
-
- return NULL;
-}
-
-static void server_info_free(AvahiSDNSServerBrowser *b, AvahiDNSServerInfo *i) {
- assert(b);
- assert(i);
-
- avahi_record_unref(i->srv_record);
- if (i->host_name_resolver)
- avahi_s_host_name_resolver_free(i->host_name_resolver);
-
- AVAHI_LLIST_REMOVE(AvahiDNSServerInfo, info, b->info, i);
-
- assert(b->n_info >= 1);
- b->n_info--;
-
- avahi_free(i);
-}
-
-static void host_name_resolver_callback(
- AvahiSHostNameResolver *r,
- AVAHI_GCC_UNUSED AvahiIfIndex interface,
- AVAHI_GCC_UNUSED AvahiProtocol protocol,
- AvahiResolverEvent event,
- const char *host_name,
- const AvahiAddress *a,
- AvahiLookupResultFlags flags,
- void* userdata) {
-
- AvahiDNSServerInfo *i = userdata;
-
- assert(r);
- assert(host_name);
- assert(i);
-
- switch (event) {
- case AVAHI_RESOLVER_FOUND: {
- i->address = *a;
-
- i->browser->callback(
- i->browser,
- i->interface,
- i->protocol,
- AVAHI_BROWSER_NEW,
- i->srv_record->data.srv.name,
- &i->address,
- i->srv_record->data.srv.port,
- i->flags | flags,
- i->browser->userdata);
-
- break;
- }
-
- case AVAHI_RESOLVER_FAILURE:
- /* Ignore */
- break;
- }
-
- avahi_s_host_name_resolver_free(i->host_name_resolver);
- i->host_name_resolver = NULL;
-}
-
-static void record_browser_callback(
- AvahiSRecordBrowser*rr,
- AvahiIfIndex interface,
- AvahiProtocol protocol,
- AvahiBrowserEvent event,
- AvahiRecord *record,
- AvahiLookupResultFlags flags,
- void* userdata) {
-
- AvahiSDNSServerBrowser *b = userdata;
-
- assert(rr);
- assert(b);
-
- /* Filter flags */
- flags &= AVAHI_LOOKUP_RESULT_CACHED | AVAHI_LOOKUP_RESULT_MULTICAST | AVAHI_LOOKUP_RESULT_WIDE_AREA;
-
- switch (event) {
- case AVAHI_BROWSER_NEW: {
- AvahiDNSServerInfo *i;
-
- assert(record);
- assert(record->key->type == AVAHI_DNS_TYPE_SRV);
-
- if (get_server_info(b, interface, protocol, record))
- return;
-
- if (b->n_info >= 10)
- return;
-
- if (!(i = avahi_new(AvahiDNSServerInfo, 1)))
- return; /* OOM */
-
- i->browser = b;
- i->interface = interface;
- i->protocol = protocol;
- i->srv_record = avahi_record_ref(record);
- i->host_name_resolver = avahi_s_host_name_resolver_new(
- b->server,
- interface, protocol,
- record->data.srv.name,
- b->aprotocol,
- b->user_flags,
- host_name_resolver_callback, i);
- i->flags = flags;
-
- AVAHI_LLIST_PREPEND(AvahiDNSServerInfo, info, b->info, i);
-
- b->n_info++;
- break;
- }
-
- case AVAHI_BROWSER_REMOVE: {
- AvahiDNSServerInfo *i;
-
- assert(record);
- assert(record->key->type == AVAHI_DNS_TYPE_SRV);
-
- if (!(i = get_server_info(b, interface, protocol, record)))
- return;
-
- if (!i->host_name_resolver)
- b->callback(
- b,
- interface,
- protocol,
- event,
- i->srv_record->data.srv.name,
- &i->address,
- i->srv_record->data.srv.port,
- i->flags | flags,
- b->userdata);
-
- server_info_free(b, i);
- break;
- }
-
- case AVAHI_BROWSER_FAILURE:
- case AVAHI_BROWSER_ALL_FOR_NOW:
- case AVAHI_BROWSER_CACHE_EXHAUSTED:
-
- b->callback(
- b,
- interface,
- protocol,
- event,
- NULL,
- NULL,
- 0,
- flags,
- b->userdata);
-
- break;
- }
-}
-
-AvahiSDNSServerBrowser *avahi_s_dns_server_browser_new(
- AvahiServer *server,
- AvahiIfIndex interface,
- AvahiProtocol protocol,
- const char *domain,
- AvahiDNSServerType type,
- AvahiProtocol aprotocol,
- AvahiLookupFlags flags,
- AvahiSDNSServerBrowserCallback callback,
- void* userdata) {
-
- static const char * const type_table[AVAHI_DNS_SERVER_MAX] = {
- "_domain._udp",
- "_dns-update._udp"
- };
-
- AvahiSDNSServerBrowser *b;
- AvahiKey *k = NULL;
- char n[AVAHI_DOMAIN_NAME_MAX];
- int r;
-
- assert(server);
- 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, AVAHI_FLAGS_VALID(flags, AVAHI_LOOKUP_USE_WIDE_AREA|AVAHI_LOOKUP_USE_MULTICAST), AVAHI_ERR_INVALID_FLAGS);
- AVAHI_CHECK_VALIDITY_RETURN_NULL(server, type < AVAHI_DNS_SERVER_MAX, AVAHI_ERR_INVALID_FLAGS);
-
- if (!domain)
- domain = server->domain_name;
-
- if ((r = avahi_service_name_join(n, sizeof(n), NULL, type_table[type], domain)) < 0) {
- avahi_server_set_errno(server, r);
- return NULL;
- }
-
- if (!(b = avahi_new(AvahiSDNSServerBrowser, 1))) {
- avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
- return NULL;
- }
-
- b->server = server;
- b->callback = callback;
- b->userdata = userdata;
- b->aprotocol = aprotocol;
- b->n_info = 0;
- b->user_flags = flags;
-
- AVAHI_LLIST_HEAD_INIT(AvahiDNSServerInfo, b->info);
- AVAHI_LLIST_PREPEND(AvahiSDNSServerBrowser, browser, server->dns_server_browsers, b);
-
- if (!(k = avahi_key_new(n, AVAHI_DNS_CLASS_IN, AVAHI_DNS_TYPE_SRV))) {
- avahi_server_set_errno(server, AVAHI_ERR_NO_MEMORY);
- goto fail;
- }
-
- if (!(b->record_browser = avahi_s_record_browser_new(server, interface, protocol, k, flags, record_browser_callback, b)))
- goto fail;
-
- avahi_key_unref(k);
-
- return b;
-
-fail:
-
- if (k)
- avahi_key_unref(k);
-
- avahi_s_dns_server_browser_free(b);
- return NULL;
-}
-
-void avahi_s_dns_server_browser_free(AvahiSDNSServerBrowser *b) {
- assert(b);
-
- while (b->info)
- server_info_free(b, b->info);
-
- AVAHI_LLIST_REMOVE(AvahiSDNSServerBrowser, browser, b->server->dns_server_browsers, b);
-
- if (b->record_browser)
- avahi_s_record_browser_free(b->record_browser);
-
- avahi_free(b);
-}
-
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