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107 lines
3.5 KiB
107 lines
3.5 KiB
/*
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* Asterisk -- An open source telephony toolkit.
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*
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* Copyright (C) 1999 - 2013, Digium, Inc.
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*
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* Mark Spencer <markster@digium.com>
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*
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* See http://www.asterisk.org for more information about
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* the Asterisk project. Please do not directly contact
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* any of the maintainers of this project for assistance;
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* the project provides a web site, mailing lists and IRC
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* channels for your use.
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License Version 2. See the LICENSE file
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* at the top of the source tree.
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*/
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/*
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* DNS SRV record support
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*/
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#ifndef _ASTERISK_SRV_H
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#define _ASTERISK_SRV_H
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/*! \file srv.h
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*
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* \brief Support for DNS SRV records, used in to locate SIP services.
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*
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* \note Note: This SRV record support will respect the priority and weight
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* elements of the records that are returned, but there are no provisions
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* for retrying or failover between records.
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*/
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/*! \brief An opaque type, for lookup usage */
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struct srv_context;
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/*! \brief Retrieve set of SRV lookups, in order
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*
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* \param[in] context A pointer in which to hold the result
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* \param[in] service The service name to look up
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* \param[out] host Result host
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* \param[out] port Associated TCP portnum
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*
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* \retval -1 Query failed
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* \retval 0 Result exists in host and port
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* \retval 1 No more results
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*/
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extern int ast_srv_lookup(struct srv_context **context, const char *service, const char **host, unsigned short *port);
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/*! \brief Cleanup resources associated with ast_srv_lookup
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*
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* \param context Pointer passed into ast_srv_lookup
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*/
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void ast_srv_cleanup(struct srv_context **context);
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/*! \brief Lookup entry in SRV records Returns 1 if found, 0 if not found, -1 on hangup
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*
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* Only do SRV record lookup if you get a domain without a port. If you get a port #, it's a DNS host name.
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*
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* \param chan Ast channel
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* \param host host name (return value)
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* \param hostlen Length of string "host"
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* \param port Port number (return value)
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* \param service Service tag for SRV lookup (like "_sip._udp" or "_stun._udp"
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*/
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extern int ast_get_srv(struct ast_channel *chan, char *host, int hostlen, int *port, const char *service);
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/*!
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* \brief Get the number of records for a given SRV context
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*
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* \details
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* This is meant to be used after calling ast_srv_lookup, so that
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* one may retrieve the number of records returned during a specific
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* SRV lookup.
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*
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* \param context The context returned by ast_srv_lookup
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*
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* \return Number of records in context
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*/
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unsigned int ast_srv_get_record_count(struct srv_context *context);
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/*!
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* \brief Retrieve details from a specific SRV record
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*
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* \details
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* After calling ast_srv_lookup, the srv_context will contain
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* the data from several records. You can retrieve the data
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* of a specific one by asking for a specific record number. The
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* records are sorted based on priority and secondarily based on
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* weight. See RFC 2782 for the exact sorting rules.
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*
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* \param context The context returned by ast_srv_lookup
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* \param record_num The 1-indexed record number to retrieve
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* \param[out] host The host portion of the record
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* \param[out] port The port portion of the record
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* \param[out] priority The priority portion of the record
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* \param[out] weight The weight portion of the record
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*
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* \retval -1 Failed to retrieve information.
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* Likely due to an out of range record_num
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* \retval 0 Success
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*/
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int ast_srv_get_nth_record(struct srv_context *context, int record_num, const char **host,
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unsigned short *port, unsigned short *priority, unsigned short *weight);
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#endif /* _ASTERISK_SRV_H */
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