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res_pjsip: Add external PJSIP resolver implementation using core DNS API.

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This change adds the following:

1. A query set implementation. This is an API that allows queries to be executed in parallel and once all have completed a callback is invoked.
2. Unit tests for the query set implementation.
3. An external PJSIP resolver which uses the DNS core API to do NAPTR, SRV, AAAA, and A lookups.

For the resolver it will do NAPTR, SRV, and AAAA/A lookups in parallel. If NAPTR or SRV
are available it will then do more queries. And so on. Preference is NAPTR > SRV > AAAA/A,
with IPv6 preferred over IPv4. For transport it will prefer TLS > TCP > UDP if no explicit
transport has been provided. Configured transports on the system are taken into account to
eliminate resolved addresses which have no hope of completing.

ASTERISK-24947 #close
Reported by: Joshua Colp

Change-Id: I56cb03ce4f9d3d600776f36928e0b3e379b5d71e
This commit is contained in:
Joshua Colp
2015-04-13 10:47:01 -03:00
parent 60d1911482
commit a3cec44a0a
13 changed files with 1479 additions and 55 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
include/asterisk/dns_query_set.h
View File

@@ -43,6 +43,8 @@ typedef void (*ast_dns_query_set_callback)(const struct ast_dns_query_set *query
*
* \retval non-NULL success
* \retval NULL failure
*
* \note The query set must be released upon cancellation or completion using ao2_ref
*/
struct ast_dns_query_set *ast_dns_query_set_create(void);
@@ -76,6 +78,8 @@ size_t ast_dns_query_set_num_queries(const struct ast_dns_query_set *query_set);
*
* \retval non-NULL success
* \retval NULL failure
*
* \note The returned query is only valid for the lifetime of the query set itself
*/
struct ast_dns_query *ast_dns_query_set_get(const struct ast_dns_query_set *query_set, unsigned int index);
@@ -106,29 +110,25 @@ void ast_dns_query_set_resolve_async(struct ast_dns_query_set *query_set, ast_dn
*
* \param query_set The query set
*
* \retval 0 success
* \retval -1 failure
*
* \note This function will return when all queries have been completed
*/
void ast_query_set_resolve(struct ast_dns_query_set *query_set);
int ast_query_set_resolve(struct ast_dns_query_set *query_set);
/*!
* \brief Cancel an asynchronous DNS query set resolution
*
* \param query_set The DNS query set
*
* \retval 0 success
* \retval -1 failure
* \retval 0 success (all queries have been cancelled)
* \retval -1 failure (some queries could not be cancelled)
*
* \note If successfully cancelled the callback will not be invoked
*/
int ast_dns_query_set_resolve_cancel(struct ast_dns_query_set *query_set);
/*!
* \brief Free a query set
*
* \param query_set A DNS query set
*/
void ast_dns_query_set_free(struct ast_dns_query_set *query_set);
#if defined(__cplusplus) || defined(c_plusplus)
}
#endif