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
diff --git a/include/osmocom/mslookup/Makefile.am b/include/osmocom/mslookup/Makefile.am
new file mode 100644
index 0000000..72ccd94
--- /dev/null
+++ b/include/osmocom/mslookup/Makefile.am
@@ -0,0 +1,6 @@
+# most headers here are installed, see /include/Makefile.am
+
+noinst_HEADERS = \
+ mdns_msg.h \
+ mdns_rfc.h \
+ $(NULL)