--- /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 <string.h>
+
+#include <catta/domain.h>
+#include <catta/malloc.h>
+#include <catta/error.h>
+
+#include "browse.h"
+#include <catta/log.h>
+#include <catta/rr.h>
+
+typedef struct CattaDNSServerInfo CattaDNSServerInfo;
+
+struct CattaDNSServerInfo {
+ CattaSDNSServerBrowser *browser;
+
+ CattaIfIndex iface;
+ CattaProtocol protocol;
+ CattaRecord *srv_record;
+ CattaSHostNameResolver *host_name_resolver;
+ CattaAddress address;
+ CattaLookupResultFlags flags;
+
+ CATTA_LLIST_FIELDS(CattaDNSServerInfo, info);
+};
+
+struct CattaSDNSServerBrowser {
+ CattaServer *server;
+
+ CattaSRecordBrowser *record_browser;
+ CattaSDNSServerBrowserCallback callback;
+ void* userdata;
+ CattaProtocol aprotocol;
+ CattaLookupFlags user_flags;
+
+ unsigned n_info;
+
+ CATTA_LLIST_FIELDS(CattaSDNSServerBrowser, browser);
+ CATTA_LLIST_HEAD(CattaDNSServerInfo, info);
+};
+
+static CattaDNSServerInfo* get_server_info(CattaSDNSServerBrowser *b, CattaIfIndex iface, CattaProtocol protocol, CattaRecord *r) {
+ CattaDNSServerInfo *i;
+
+ assert(b);
+ assert(r);
+
+ for (i = b->info; i; i = i->info_next)
+ if (i->iface == iface &&
+ i->protocol == protocol &&
+ catta_record_equal_no_ttl(r, i->srv_record))
+ return i;
+
+ return NULL;
+}
+
+static void server_info_free(CattaSDNSServerBrowser *b, CattaDNSServerInfo *i) {
+ assert(b);
+ assert(i);
+
+ catta_record_unref(i->srv_record);
+ if (i->host_name_resolver)
+ catta_s_host_name_resolver_free(i->host_name_resolver);
+
+ CATTA_LLIST_REMOVE(CattaDNSServerInfo, info, b->info, i);
+
+ assert(b->n_info >= 1);
+ b->n_info--;
+
+ catta_free(i);
+}
+
+static void host_name_resolver_callback(
+ CattaSHostNameResolver *r,
+ CATTA_GCC_UNUSED CattaIfIndex iface,
+ CATTA_GCC_UNUSED CattaProtocol protocol,
+ CattaResolverEvent event,
+ const char *host_name,
+ const CattaAddress *a,
+ CattaLookupResultFlags flags,
+ void* userdata) {
+
+ CattaDNSServerInfo *i = userdata;
+
+ assert(r);
+ assert(host_name);
+ assert(i);
+
+ switch (event) {
+ case CATTA_RESOLVER_FOUND: {
+ i->address = *a;
+
+ i->browser->callback(
+ i->browser,
+ i->iface,
+ i->protocol,
+ CATTA_BROWSER_NEW,
+ i->srv_record->data.srv.name,
+ &i->address,
+ i->srv_record->data.srv.port,
+ i->flags | flags,
+ i->browser->userdata);
+
+ break;
+ }
+
+ case CATTA_RESOLVER_FAILURE:
+ /* Ignore */
+ break;
+ }
+
+ catta_s_host_name_resolver_free(i->host_name_resolver);
+ i->host_name_resolver = NULL;
+}
+
+static void record_browser_callback(
+ CattaSRecordBrowser*rr,
+ CattaIfIndex iface,
+ CattaProtocol protocol,
+ CattaBrowserEvent event,
+ CattaRecord *record,
+ CattaLookupResultFlags flags,
+ void* userdata) {
+
+ CattaSDNSServerBrowser *b = userdata;
+
+ assert(rr);
+ assert(b);
+
+ /* Filter flags */
+ flags &= CATTA_LOOKUP_RESULT_CACHED | CATTA_LOOKUP_RESULT_MULTICAST | CATTA_LOOKUP_RESULT_WIDE_AREA;
+
+ switch (event) {
+ case CATTA_BROWSER_NEW: {
+ CattaDNSServerInfo *i;
+
+ assert(record);
+ assert(record->key->type == CATTA_DNS_TYPE_SRV);
+
+ if (get_server_info(b, iface, protocol, record))
+ return;
+
+ if (b->n_info >= 10)
+ return;
+
+ if (!(i = catta_new(CattaDNSServerInfo, 1)))
+ return; /* OOM */
+
+ i->browser = b;
+ i->iface = iface;
+ i->protocol = protocol;
+ i->srv_record = catta_record_ref(record);
+ i->host_name_resolver = catta_s_host_name_resolver_new(
+ b->server,
+ iface, protocol,
+ record->data.srv.name,
+ b->aprotocol,
+ b->user_flags,
+ host_name_resolver_callback, i);
+ i->flags = flags;
+
+ CATTA_LLIST_PREPEND(CattaDNSServerInfo, info, b->info, i);
+
+ b->n_info++;
+ break;
+ }
+
+ case CATTA_BROWSER_REMOVE: {
+ CattaDNSServerInfo *i;
+
+ assert(record);
+ assert(record->key->type == CATTA_DNS_TYPE_SRV);
+
+ if (!(i = get_server_info(b, iface, protocol, record)))
+ return;
+
+ if (!i->host_name_resolver)
+ b->callback(
+ b,
+ iface,
+ 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 CATTA_BROWSER_FAILURE:
+ case CATTA_BROWSER_ALL_FOR_NOW:
+ case CATTA_BROWSER_CACHE_EXHAUSTED:
+
+ b->callback(
+ b,
+ iface,
+ protocol,
+ event,
+ NULL,
+ NULL,
+ 0,
+ flags,
+ b->userdata);
+
+ break;
+ }
+}
+
+CattaSDNSServerBrowser *catta_s_dns_server_browser_new(
+ CattaServer *server,
+ CattaIfIndex iface,
+ CattaProtocol protocol,
+ const char *domain,
+ CattaDNSServerType type,
+ CattaProtocol aprotocol,
+ CattaLookupFlags flags,
+ CattaSDNSServerBrowserCallback callback,
+ void* userdata) {
+
+ static const char * const type_table[CATTA_DNS_SERVER_MAX] = {
+ "_domain._udp",
+ "_dns-update._udp"
+ };
+
+ CattaSDNSServerBrowser *b;
+ CattaKey *k = NULL;
+ char n[CATTA_DOMAIN_NAME_MAX];
+ int r;
+
+ assert(server);
+ 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_PROTO_VALID(aprotocol), CATTA_ERR_INVALID_PROTOCOL);
+ CATTA_CHECK_VALIDITY_RETURN_NULL(server, !domain || catta_is_valid_domain_name(domain), CATTA_ERR_INVALID_DOMAIN_NAME);
+ CATTA_CHECK_VALIDITY_RETURN_NULL(server, CATTA_FLAGS_VALID(flags, CATTA_LOOKUP_USE_WIDE_AREA|CATTA_LOOKUP_USE_MULTICAST), CATTA_ERR_INVALID_FLAGS);
+ CATTA_CHECK_VALIDITY_RETURN_NULL(server, type < CATTA_DNS_SERVER_MAX, CATTA_ERR_INVALID_FLAGS);
+
+ if (!domain)
+ domain = server->domain_name;
+
+ if ((r = catta_service_name_join(n, sizeof(n), NULL, type_table[type], domain)) < 0) {
+ catta_server_set_errno(server, r);
+ return NULL;
+ }
+
+ if (!(b = catta_new(CattaSDNSServerBrowser, 1))) {
+ catta_server_set_errno(server, CATTA_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;
+
+ CATTA_LLIST_HEAD_INIT(CattaDNSServerInfo, b->info);
+ CATTA_LLIST_PREPEND(CattaSDNSServerBrowser, browser, server->dns_server_browsers, b);
+
+ if (!(k = catta_key_new(n, CATTA_DNS_CLASS_IN, CATTA_DNS_TYPE_SRV))) {
+ catta_server_set_errno(server, CATTA_ERR_NO_MEMORY);
+ goto fail;
+ }
+
+ if (!(b->record_browser = catta_s_record_browser_new(server, iface, protocol, k, flags, record_browser_callback, b)))
+ goto fail;
+
+ catta_key_unref(k);
+
+ return b;
+
+fail:
+
+ if (k)
+ catta_key_unref(k);
+
+ catta_s_dns_server_browser_free(b);
+ return NULL;
+}
+
+void catta_s_dns_server_browser_free(CattaSDNSServerBrowser *b) {
+ assert(b);
+
+ while (b->info)
+ server_info_free(b, b->info);
+
+ CATTA_LLIST_REMOVE(CattaSDNSServerBrowser, browser, b->server->dns_server_browsers, b);
+
+ if (b->record_browser)
+ catta_s_record_browser_free(b->record_browser);
+
+ catta_free(b);
+}
+
projects / catta / blobdiff