add mDNS lookup method to libosmo-mslookup
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.
Related: OS#4237
Patch-by: osmith, nhofmeyr
Change-Id: I03a0ffa1d4dc1b24ac78a5ad0975bca90a49c728
diff --git a/tests/mslookup/mslookup_client_mdns_test.err b/tests/mslookup/mslookup_client_mdns_test.err
new file mode 100644
index 0000000..b4ea269
--- /dev/null
+++ b/tests/mslookup/mslookup_client_mdns_test.err
@@ -0,0 +1,14 @@
+Total time passed: 0.000000 s
+-- test_server_client --
+server_init
+client_init
+client_query
+sending mDNS query: gsup.hlr.123456789012345.imsi
+server_recv
+received request
+server_recv
+client_recv
+client_recv(): gsup.hlr.123456789012345.imsi -> ipv4: 42.42.42.42:444 -> ipv6: [1122:3344:5566:7788:99aa:bbcc:ddee:ff00]:666 (age=3) (not-last)
+Total time passed: 5.000000 s
+server_stop
+client_stop