[Asterisk-code-review] Change in asterisk[master]: res_pjsip: Add external PJSIP resolver implementation using ...

[Joshua Colp (Code Review)]

Joshua Colp has uploaded a new patch set (#3).

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

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

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
---
M CHANGES
M configure
M configure.ac
M include/asterisk/autoconfig.h.in
M include/asterisk/dns_core.h
M include/asterisk/dns_internal.h
M include/asterisk/dns_query_set.h
M main/dns_core.c
M main/dns_query_set.c
M res/res_pjsip.c
M res/res_pjsip/include/res_pjsip_private.h
A res/res_pjsip/pjsip_resolver.c
M res/res_pjsip_session.c
A tests/test_dns_query_set.c
14 files changed, 1,480 insertions(+), 55 deletions(-)


  git pull ssh://gerrit.asterisk.org:29418/asterisk refs/changes/75/75/3
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Gerrit-MessageType: newpatchset
Gerrit-Change-Id: I56cb03ce4f9d3d600776f36928e0b3e379b5d71e
Gerrit-PatchSet: 3
Gerrit-Project: asterisk
Gerrit-Branch: master
Gerrit-Owner: Joshua Colp <jcolp at digium.com>
Gerrit-Reviewer: Mark Michelson <mmichelson at digium.com>
Gerrit-Reviewer: Matt Jordan <mjordan at digium.com>