Author: file
Date: Fri Mar 6 09:02:54 2015
New Revision: 432516
URL: http://svnview.digium.com/svn/asterisk?view=rev&rev=432516
Log:
Add a recurring query API.
Added:
team/group/dns/include/asterisk/dns_recurring.h (with props)
Modified:
team/group/dns/include/asterisk/dns_internal.h
team/group/dns/main/dns_core.c
Modified: team/group/dns/include/asterisk/dns_internal.h
URL:
http://svnview.digium.com/svn/asterisk/team/group/dns/include/asterisk/dns_internal.h?view=diff&rev=432516&r1=432515&r2=432516
==============================================================================
--- team/group/dns/include/asterisk/dns_internal.h (original)
+++ team/group/dns/include/asterisk/dns_internal.h Fri Mar 6 09:02:54 2015
@@ -107,3 +107,23 @@
char name[0];
};
+/*! \brief A recurring DNS query */
+struct ast_dns_query_recurring
+{
+ /*! \brief Callback to invoke upon completion */
+ ast_dns_resolve_callback callback;
+ /*! \brief User-specific data */
+ void *user_data;
+ /*! \brief Current active query */
+ struct ast_dns_query *query;
+ /*! \brief The recurring query has been cancelled */
+ unsigned int cancelled;
+ /*! \brief Scheduled timer for next resolution */
+ int timer;
+ /*! \brief Resource record type */
+ int rr_type;
+ /*! \brief Resource record class */
+ int rr_class;
+ /*! \brief The name of what is being resolved */
+ char name[0];
+};
Added: team/group/dns/include/asterisk/dns_recurring.h
URL:
http://svnview.digium.com/svn/asterisk/team/group/dns/include/asterisk/dns_recurring.h?view=auto&rev=432516
==============================================================================
--- team/group/dns/include/asterisk/dns_recurring.h (added)
+++ team/group/dns/include/asterisk/dns_recurring.h Fri Mar 6 09:02:54 2015
@@ -1,0 +1,70 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2015, Digium, Inc.
+ *
+ * Joshua Colp <jc...@digium.com>
+ *
+ * See http://www.asterisk.org for more information about
+ * the Asterisk project. Please do not directly contact
+ * any of the maintainers of this project for assistance;
+ * the project provides a web site, mailing lists and IRC
+ * channels for your use.
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License Version 2. See the LICENSE file
+ * at the top of the source tree.
+ */
+
+/*! \file
+ * \brief DNS Recurring Resolution API
+ * \author Joshua Colp <jc...@digium.com>
+ */
+
+#ifndef _ASTERISK_DNS_RECURRING_H
+#define _ASTERISK_DNS_RECURRING_H
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+/*! \brief Opaque structure for a recurring DNS query */
+struct ast_dns_query_recurring;
+
+/*!
+ * \brief Asynchronously resolve a DNS query, and continue resolving it
according to the lowest TTL available
+ *
+ * \param name The name of what to resolve
+ * \param rr_type Resource record type
+ * \param rr_class Resource record class
+ * \param callback The callback to invoke upon completion
+ * \param data User data to make available on the query
+ *
+ * \retval non-NULL success - query has been sent for resolution
+ * \retval NULL failure
+ *
+ * \note The user data passed in to this function must be ao2 allocated
+ *
+ * \note This query will continue to happen according to the lowest TTL unless
cancelled using ast_dns_resolve_cancel
+ *
+ * \note It is NOT possible for the callback to be invoked concurrently for
the query multiple times
+ */
+struct ast_dns_query_recurring *ast_dns_resolve_recurring(const char *name,
int rr_type, int rr_class, ast_dns_resolve_callback callback, void *data);
+
+/*!
+ * \brief Cancel an asynchronous recurring DNS resolution
+ *
+ * \param query The DNS query returned from ast_dns_resolve_recurring
+ *
+ * \retval 0 success
+ * \retval -1 failure
+ *
+ * \note If successfully cancelled the callback will not be invoked
+ */
+int ast_dns_resolve_recurring_cancel(struct ast_dns_query_recurring
*recurring);
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}
+#endif
+
+#endif /* _ASTERISK_DNS_RECURRING_H */
Propchange: team/group/dns/include/asterisk/dns_recurring.h
------------------------------------------------------------------------------
svn:eol-style = native
Propchange: team/group/dns/include/asterisk/dns_recurring.h
------------------------------------------------------------------------------
svn:keywords = Author Date Id Revision
Propchange: team/group/dns/include/asterisk/dns_recurring.h
------------------------------------------------------------------------------
svn:mime-type = text/plain
Modified: team/group/dns/main/dns_core.c
URL:
http://svnview.digium.com/svn/asterisk/team/group/dns/main/dns_core.c?view=diff&rev=432516&r1=432515&r2=432516
==============================================================================
--- team/group/dns/main/dns_core.c (original)
+++ team/group/dns/main/dns_core.c Fri Mar 6 09:02:54 2015
@@ -40,6 +40,7 @@
#include "asterisk/dns_naptr.h"
#include "asterisk/dns_srv.h"
#include "asterisk/dns_tlsa.h"
+#include "asterisk/dns_recurring.h"
#include "asterisk/dns_resolver.h"
#include "asterisk/dns_internal.h"
@@ -434,6 +435,131 @@
query->callback(query);
}
+/*! \brief Destructor for a DNS query */
+static void dns_query_recurring_destroy(void *data)
+{
+ struct ast_dns_query_recurring *recurring = data;
+
+ ao2_cleanup(recurring->user_data);
+}
+
+/*! \brief Determine the TTL to use when scheduling recurring resolution */
+static int dns_query_recurring_get_ttl(const struct ast_dns_query *query)
+{
+ int ttl = 0;
+ const struct ast_dns_result *result = ast_dns_query_get_result(query);
+ const struct ast_dns_record *record;
+
+ if (ast_dns_result_get_nxdomain(result)) {
+ return 0;
+ }
+
+ for (record = ast_dns_result_get_records(result); record; record =
ast_dns_record_get_next(record)) {
+ if (!ttl || (ast_dns_record_get_ttl(record) < ttl)) {
+ ttl = ast_dns_record_get_ttl(record);
+ }
+ }
+
+ return ttl;
+}
+
+static void dns_query_recurring_resolution_callback(const struct ast_dns_query
*query);
+
+/*! \brief Scheduled recurring query callback */
+static int dns_query_recurring_scheduled_callback(const void *data)
+{
+ struct ast_dns_query_recurring *recurring = (struct
ast_dns_query_recurring *)data;
+
+ ao2_lock(recurring);
+ if (!recurring->cancelled) {
+ recurring->query = ast_dns_resolve_async(recurring->name,
recurring->rr_type, recurring->rr_class,
dns_query_recurring_resolution_callback,
+ recurring);
+ }
+ ao2_unlock(recurring);
+
+ ao2_ref(recurring, -1);
+
+ return 0;
+}
+
+/*! \brief Query resolution callback */
+static void dns_query_recurring_resolution_callback(const struct ast_dns_query
*query)
+{
+ struct ast_dns_query_recurring *recurring =
ast_dns_query_get_data(query);
+
+ /* Replace the user data so the actual callback sees what it provided */
+ ((struct ast_dns_query*)query)->user_data =
ao2_bump(recurring->user_data);
+ recurring->callback(query);
+
+ ao2_lock(recurring);
+ recurring->timer = -1;
+
+ /* So.. if something has not externally cancelled this we can
reschedule based on the TTL */
+ if (!recurring->cancelled) {
+ int ttl = dns_query_recurring_get_ttl(query);
+
+ if (ttl) {
+ recurring->timer = ast_sched_add(sched, ttl,
dns_query_recurring_scheduled_callback, ao2_bump(recurring));
+ if (recurring->timer < 0) {
+ ao2_ref(recurring, -1);
+ }
+ }
+ }
+
+ ao2_replace(recurring->query, NULL);
+ ao2_unlock(recurring);
+
+ /* Since we stole the reference from the query we need to drop it
ourselves */
+ ao2_ref(recurring, -1);
+}
+
+struct ast_dns_query_recurring *ast_dns_resolve_recurring(const char *name,
int rr_type, int rr_class, ast_dns_resolve_callback callback, void *data)
+{
+ struct ast_dns_query_recurring *recurring;
+
+ if (ast_strlen_zero(name) || !callback) {
+ return NULL;
+ }
+
+ recurring = ao2_alloc(sizeof(*recurring) + strlen(name) + 1,
dns_query_recurring_destroy);
+ if (!recurring) {
+ return NULL;
+ }
+
+ recurring->callback = callback;
+ recurring->user_data = ao2_bump(data);
+ recurring->timer = -1;
+ recurring->rr_type = rr_type;
+ recurring->rr_class = rr_class;
+ strcpy(recurring->name, name); /* SAFE */
+
+ /* The scheduler callback expects a reference, so bump it up */
+ recurring->query = ast_dns_resolve_async(name, rr_type, rr_class,
dns_query_recurring_resolution_callback, recurring);
+ if (!recurring->query) {
+ ao2_ref(recurring, -1);
+ return NULL;
+ }
+
+ return recurring;
+}
+
+int ast_dns_resolve_recurring_cancel(struct ast_dns_query_recurring *recurring)
+{
+ ao2_lock(recurring);
+
+ recurring->cancelled = 1;
+ AST_SCHED_DEL_UNREF(sched, recurring->timer, ao2_ref(recurring, -1));
+
+ if (recurring->query) {
+ ast_dns_resolve_cancel(recurring->query);
+ ao2_replace(recurring->query, NULL);
+ }
+
+ ao2_unlock(recurring);
+
+ return 0;
+}
+
static void dns_shutdown(void)
{
if (sched) {
--
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