meson,resolved: make default LLMNR= and MulticastDNS= values configurable

For https://fedoraproject.org/wiki/Changes/systemd-resolved.

meson.build

@@ -1302,6 +1302,16 @@ conf.set('DEFAULT_DNS_OVER_TLS_MODE',
          'DNS_OVER_TLS_' + default_dns_over_tls.underscorify().to_upper())
 substs.set('DEFAULT_DNS_OVER_TLS_MODE', default_dns_over_tls)
 
+default_mdns = get_option('default-mdns')
+conf.set('DEFAULT_MDNS_MODE',
+         'RESOLVE_SUPPORT_' + default_mdns.to_upper())
+substs.set('DEFAULT_MDNS_MODE', default_mdns)
+
+default_llmnr = get_option('default-llmnr')
+conf.set('DEFAULT_LLMNR_MODE',
+         'RESOLVE_SUPPORT_' + default_llmnr.to_upper())
+substs.set('DEFAULT_LLMNR_MODE', default_llmnr)
+
 want_repart = get_option('repart')
 if want_repart != 'false'
         have = (conf.get('HAVE_OPENSSL') == 1 and
@@ -3354,6 +3364,8 @@ status = [
 
         'default DNSSEC mode:               @0@'.format(default_dnssec),
         'default DNS-over-TLS mode:         @0@'.format(default_dns_over_tls),
+        'default mDNS mode:                 @0@'.format(default_mdns),
+        'default LLMNR mode:                @0@'.format(default_llmnr),
         'default cgroup hierarchy:          @0@'.format(default_hierarchy),
         'default net.naming-scheme setting: @0@'.format(default_net_naming_scheme),
         'default KillUserProcesses setting: @0@'.format(kill_user_processes),

meson_options.txt

@@ -230,6 +230,14 @@ option('default-dns-over-tls', type : 'combo',
        description : 'default DNS-over-TLS mode',
        choices : ['yes', 'opportunistic', 'no'],
        value : 'no')
+option('default-mdns', type : 'combo',
+       choices : ['yes', 'resolve', 'no'],
+       description : 'default MulticastDNS mode',
+       value : 'yes')
+option('default-llmnr', type : 'combo',
+       choices : ['yes', 'resolve', 'no'],
+       description : 'default LLMNR mode',
+       value : 'yes')
 option('dns-over-tls', type : 'combo', choices : ['auto', 'gnutls', 'openssl', 'true', 'false'],
        description : 'DNS-over-TLS support')
 option('dns-servers', type : 'string',

src/resolve/resolved-manager.c

@@ -581,8 +581,8 @@ int manager_new(Manager **ret) {
                 .dns_stub_tcp_fd = -1,
                 .hostname_fd = -1,
 
-                .llmnr_support = RESOLVE_SUPPORT_YES,
-                .mdns_support = RESOLVE_SUPPORT_YES,
+                .llmnr_support = DEFAULT_LLMNR_MODE,
+                .mdns_support = DEFAULT_MDNS_MODE,
                 .dnssec_mode = DEFAULT_DNSSEC_MODE,
                 .dns_over_tls_mode = DEFAULT_DNS_OVER_TLS_MODE,
                 .enable_cache = DNS_CACHE_MODE_YES,

src/resolve/resolved.conf.in

@@ -15,10 +15,10 @@
 #DNS=
 #FallbackDNS=@DNS_SERVERS@
 #Domains=
-#LLMNR=yes
-#MulticastDNS=yes
 #DNSSEC=@DEFAULT_DNSSEC_MODE@
 #DNSOverTLS=@DEFAULT_DNS_OVER_TLS_MODE@
+#MulticastDNS=@DEFAULT_MDNS_MODE@
+#LLMNR=@DEFAULT_LLMNR_MODE@
 #Cache=yes
 #DNSStubListener=yes
 #ReadEtcHosts=yes