dns: Add core DNS API + unit tests and res_resolver_unbound module + unit tests.

This change adds an abstracted core DNS API which resembles the API described
here[1]. The API provides a pluggable mechanism for resolvers and also a
consistent view for records. Both synchronous and asynchronous queries are
supported.

This change also adds a res_resolver_unbound module which uses the libunbound
library to provide resolution.

Unit tests have also been written for all of the above to confirm the API and
functionality.

ASTERISK-24834 #close
Reported by: Matt Jordan

ASTERISK-24836 #close
Reported by: Matt Jordan

Review: https://reviewboard.asterisk.org/r/4474/
Review: https://reviewboard.asterisk.org/r/4512/

[1] https://wiki.asterisk.org/wiki/display/AST/Asterisk+DNS+API


git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@433370 65c4cc65-6c06-0410-ace0-fbb531ad65f3

1 files changed, 89 insertions, 0 deletions

diff --git a/include/asterisk/dns_naptr.h b/include/asterisk/dns_naptr.h
new file mode 100644
index 000000000..5d7541aa5
--- /dev/null
+++ b/include/asterisk/dns_naptr.h
@@ -0,0 +1,89 @@
+/*
+ * Asterisk -- An open source telephony toolkit.
+ *
+ * Copyright (C) 2015, Digium, Inc.
+ *
+ * Joshua Colp <jcolp@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 NAPTR Record Parsing API
+ * \author Joshua Colp <jcolp@digium.com>
+ */
+
+#ifndef _ASTERISK_DNS_NAPTR_H
+#define _ASTERISK_DNS_NAPTR_H
+
+#if defined(__cplusplus) || defined(c_plusplus)
+extern "C" {
+#endif
+
+/*!
+ * \brief Get the flags from a NAPTR record
+ *
+ * \param record The DNS record
+ *
+ * \return the flags
+ */
+const char *ast_dns_naptr_get_flags(const struct ast_dns_record *record);
+
+/*!
+ * \brief Get the service from a NAPTR record
+ *
+ * \param record The DNS record
+ *
+ * \return the service
+ */
+const char *ast_dns_naptr_get_service(const struct ast_dns_record *record);
+
+/*!
+ * \brief Get the regular expression from a NAPTR record
+ *
+ * \param record The DNS record
+ *
+ * \return the regular expression
+ */
+const char *ast_dns_naptr_get_regexp(const struct ast_dns_record *record);
+
+/*!
+ * \brief Get the replacement value from a NAPTR record
+ *
+ * \param record The DNS record
+ *
+ * \return the replacement value
+ */
+const char *ast_dns_naptr_get_replacement(const struct ast_dns_record *record);
+
+/*!
+ * \brief Get the order from a NAPTR record
+ *
+ * \param record The DNS record
+ *
+ * \return the order
+ */
+unsigned short ast_dns_naptr_get_order(const struct ast_dns_record *record);
+
+/*!
+ * \brief Get the preference from a NAPTR record
+ *
+ * \param record The DNS record
+ *
+ * \return the preference
+ */
+unsigned short ast_dns_naptr_get_preference(const struct ast_dns_record *record);
+
+#if defined(__cplusplus) || defined(c_plusplus)
+}
+#endif
+
+#endif /* _ASTERISK_DNS_NAPTR_H */