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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
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4
include/asterisk/autoconfig.h.in
View File

@@ -578,6 +578,10 @@
/* Define if your system has the PJPROJECT libraries. */
#undef HAVE_PJPROJECT
/* Define to 1 if PJPROJECT has the PJSIP External Resolver Support feature.
*/
#undef HAVE_PJSIP_EXTERNAL_RESOLVER
/* Define to 1 if PJPROJECT has the pjsip_get_dest_info support feature. */
#undef HAVE_PJSIP_GET_DEST_INFO