tree 81f670b421d499617e5b922b6585ef09977f9a2c
parent 5436c77a96b5cfb6d1b7ad8c074089e4ab6e9daa
author Oliver Smith <osmith@sysmocom.de> 1574243795 +0100
committer Oliver Smith <osmith@sysmocom.de> 1578921050 +0100

add mDNS lookup method to libosmo-mslookup (#2)

Add the first actually useful lookup method to the mslookup library: multicast
DNS.

The server side is added in a subsequent commit, when the mslookup server is
implemented for the osmo-hlr program.

Use custom DNS encoding instead of libc-ares (which we use in OsmoSGSN
already), because libc-ares is only a DNS client implementation and we will
need both client and server.

Resubmit of f10463c5fc6d9e786ab7c648d99f7450f9a25906 after being
reverted in 110a49f69f29fed844d8743b76fd748f4a14812a. This new version
skips the mslookup_client_mdns test if multicast is not supported in the
build environment. I have verified that it doesn't break the build
anymore in my own OBS namespace.

Related: OS#4237, OS#4361
Patch-by: osmith, nhofmeyr
Change-Id: I3c340627181b632dd6a0d577aa2ea2a7cd035c0c