--- /dev/null
+/***
+ This file is part of catta.
+
+ catta 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.
+
+ catta 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 catta; 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 <stdlib.h>
+
+#include <catta/domain.h>
+#include <catta/timeval.h>
+#include <catta/malloc.h>
+#include <catta/error.h>
+
+#include "browse.h"
+#include <catta/log.h>
+
+#define TIMEOUT_MSEC 5000
+
+struct CattaSHostNameResolver {
+ CattaServer *server;
+ char *host_name;
+
+ CattaSRecordBrowser *record_browser_a;
+ CattaSRecordBrowser *record_browser_aaaa;
+
+ CattaSHostNameResolverCallback callback;
+ void* userdata;
+
+ CattaRecord *address_record;
+ CattaIfIndex iface;
+ CattaProtocol protocol;
+ CattaLookupResultFlags flags;
+
+ CattaTimeEvent *time_event;
+
+ CATTA_LLIST_FIELDS(CattaSHostNameResolver, resolver);
+};
+
+static void finish(CattaSHostNameResolver *r, CattaResolverEvent event) {
+ assert(r);
+
+ if (r->time_event) {
+ catta_time_event_free(r->time_event);
+ r->time_event = NULL;
+ }
+
+ switch (event) {
+ case CATTA_RESOLVER_FOUND: {
+ CattaAddress a;
+
+ assert(r->address_record);
+
+ switch (r->address_record->key->type) {
+ case CATTA_DNS_TYPE_A:
+ a.proto = CATTA_PROTO_INET;
+ a.data.ipv4 = r->address_record->data.a.address;
+ break;
+
+ case CATTA_DNS_TYPE_AAAA:
+ a.proto = CATTA_PROTO_INET6;
+ a.data.ipv6 = r->address_record->data.aaaa.address;
+ break;
+
+ default:
+ abort();
+ }
+
+ r->callback(r, r->iface, r->protocol, CATTA_RESOLVER_FOUND, r->address_record->key->name, &a, r->flags, r->userdata);
+ break;
+
+ }
+
+ case CATTA_RESOLVER_FAILURE:
+
+ r->callback(r, r->iface, r->protocol, event, r->host_name, NULL, r->flags, r->userdata);
+ break;
+ }
+}
+
+static void time_event_callback(CattaTimeEvent *e, void *userdata) {
+ CattaSHostNameResolver *r = userdata;
+
+ assert(e);
+ assert(r);
+
+ catta_server_set_errno(r->server, CATTA_ERR_TIMEOUT);
+ finish(r, CATTA_RESOLVER_FAILURE);
+}
+
+static void start_timeout(CattaSHostNameResolver *r) {
+ struct timeval tv;
+ assert(r);
+
+ if (r->time_event)
+ return;
+
+ catta_elapse_time(&tv, TIMEOUT_MSEC, 0);
+
+ r->time_event = catta_time_event_new(r->server->time_event_queue, &tv, time_event_callback, r);
+}
+
+static void record_browser_callback(
+ CattaSRecordBrowser*rr,
+ CattaIfIndex iface,
+ CattaProtocol protocol,
+ CattaBrowserEvent event,
+ CattaRecord *record,
+ CattaLookupResultFlags flags,
+ void* userdata) {
+
+ CattaSHostNameResolver *r = userdata;
+
+ assert(rr);
+ assert(r);
+
+
+ switch (event) {
+ case CATTA_BROWSER_NEW:
+ assert(record);
+ assert(record->key->type == CATTA_DNS_TYPE_A || record->key->type == CATTA_DNS_TYPE_AAAA);
+
+ if (r->iface > 0 && iface != r->iface)
+ return;
+
+ if (r->protocol != CATTA_PROTO_UNSPEC && protocol != r->protocol)
+ return;
+
+ if (r->iface <= 0)
+ r->iface = iface;
+
+ if (r->protocol == CATTA_PROTO_UNSPEC)
+ r->protocol = protocol;
+
+ if (!r->address_record) {
+ r->address_record = catta_record_ref(record);
+ r->flags = flags;
+
+ finish(r, CATTA_RESOLVER_FOUND);
+ }
+
+ break;
+
+ case CATTA_BROWSER_REMOVE:
+ assert(record);
+ assert(record->key->type == CATTA_DNS_TYPE_A || record->key->type == CATTA_DNS_TYPE_AAAA);
+
+ if (r->address_record && catta_record_equal_no_ttl(record, r->address_record)) {
+ catta_record_unref(r->address_record);
+ r->address_record = NULL;
+
+ r->flags = flags;
+
+
+ /** Look for a replacement */
+ if (r->record_browser_aaaa)
+ catta_s_record_browser_restart(r->record_browser_aaaa);
+ if (r->record_browser_a)
+ catta_s_record_browser_restart(r->record_browser_a);
+
+ start_timeout(r);
+ }
+
+ break;
+
+ case CATTA_BROWSER_CACHE_EXHAUSTED:
+ case CATTA_BROWSER_ALL_FOR_NOW:
+ /* Ignore */
+ break;
+
+ case CATTA_BROWSER_FAILURE:
+
+ /* Stop browsers */
+
+ if (r->record_browser_aaaa)
+ catta_s_record_browser_free(r->record_browser_aaaa);
+ if (r->record_browser_a)
+ catta_s_record_browser_free(r->record_browser_a);
+
+ r->record_browser_a = r->record_browser_aaaa = NULL;
+ r->flags = flags;
+
+ finish(r, CATTA_RESOLVER_FAILURE);
+ break;
+ }
+}
+
+CattaSHostNameResolver *catta_s_host_name_resolver_new(
+ CattaServer *server,
+ CattaIfIndex iface,
+ CattaProtocol protocol,
+ const char *host_name,
+ CattaProtocol aprotocol,
+ CattaLookupFlags flags,
+ CattaSHostNameResolverCallback callback,
+ void* userdata) {
+
+ CattaSHostNameResolver *r;
+ CattaKey *k;
+
+ assert(server);
+ assert(host_name);
+ assert(callback);
+
+ CATTA_CHECK_VALIDITY_RETURN_NULL(server, CATTA_IF_VALID(iface), CATTA_ERR_INVALID_INTERFACE);
+ CATTA_CHECK_VALIDITY_RETURN_NULL(server, CATTA_PROTO_VALID(protocol), CATTA_ERR_INVALID_PROTOCOL);
+ CATTA_CHECK_VALIDITY_RETURN_NULL(server, catta_is_valid_fqdn(host_name), CATTA_ERR_INVALID_HOST_NAME);
+ CATTA_CHECK_VALIDITY_RETURN_NULL(server, CATTA_PROTO_VALID(aprotocol), CATTA_ERR_INVALID_PROTOCOL);
+ CATTA_CHECK_VALIDITY_RETURN_NULL(server, CATTA_FLAGS_VALID(flags, CATTA_LOOKUP_USE_WIDE_AREA|CATTA_LOOKUP_USE_MULTICAST), CATTA_ERR_INVALID_FLAGS);
+
+ if (!(r = catta_new(CattaSHostNameResolver, 1))) {
+ catta_server_set_errno(server, CATTA_ERR_NO_MEMORY);
+ return NULL;
+ }
+
+ r->server = server;
+ r->host_name = catta_normalize_name_strdup(host_name);
+ r->callback = callback;
+ r->userdata = userdata;
+ r->address_record = NULL;
+ r->iface = iface;
+ r->protocol = protocol;
+ r->flags = 0;
+
+ r->record_browser_a = r->record_browser_aaaa = NULL;
+
+ r->time_event = NULL;
+
+ CATTA_LLIST_PREPEND(CattaSHostNameResolver, resolver, server->host_name_resolvers, r);
+
+ r->record_browser_aaaa = r->record_browser_a = NULL;
+
+ if (aprotocol == CATTA_PROTO_INET || aprotocol == CATTA_PROTO_UNSPEC) {
+ k = catta_key_new(host_name, CATTA_DNS_CLASS_IN, CATTA_DNS_TYPE_A);
+ r->record_browser_a = catta_s_record_browser_new(server, iface, protocol, k, flags, record_browser_callback, r);
+ catta_key_unref(k);
+
+ if (!r->record_browser_a)
+ goto fail;
+ }
+
+ if (aprotocol == CATTA_PROTO_INET6 || aprotocol == CATTA_PROTO_UNSPEC) {
+ k = catta_key_new(host_name, CATTA_DNS_CLASS_IN, CATTA_DNS_TYPE_AAAA);
+ r->record_browser_aaaa = catta_s_record_browser_new(server, iface, protocol, k, flags, record_browser_callback, r);
+ catta_key_unref(k);
+
+ if (!r->record_browser_aaaa)
+ goto fail;
+ }
+
+ assert(r->record_browser_aaaa || r->record_browser_a);
+
+ start_timeout(r);
+
+ return r;
+
+fail:
+ catta_s_host_name_resolver_free(r);
+ return NULL;
+}
+
+void catta_s_host_name_resolver_free(CattaSHostNameResolver *r) {
+ assert(r);
+
+ CATTA_LLIST_REMOVE(CattaSHostNameResolver, resolver, r->server->host_name_resolvers, r);
+
+ if (r->record_browser_a)
+ catta_s_record_browser_free(r->record_browser_a);
+
+ if (r->record_browser_aaaa)
+ catta_s_record_browser_free(r->record_browser_aaaa);
+
+ if (r->time_event)
+ catta_time_event_free(r->time_event);
+
+ if (r->address_record)
+ catta_record_unref(r->address_record);
+
+ catta_free(r->host_name);
+ catta_free(r);
+}
projects / catta / blobdiff