sd-network: add support for wildcard domains

src/network/networkctl.c

@@ -366,6 +366,13 @@ static int link_status_one(sd_rtnl *rtnl, struct udev *udev, const char *name) {
         sd_network_link_get_dns(ifindex, &dns);
         sd_network_link_get_ntp(ifindex, &ntp);
         sd_network_link_get_domains(ifindex, &domains);
+        r = sd_network_link_get_wildcard_domain(ifindex);
+        if (r > 0) {
+                char *wildcard;
+
+                wildcard = strdup("*");
+                strv_push(&domains, wildcard);
+        }
 
         sprintf(devid, "n%i", ifindex);
         d = udev_device_new_from_device_id(udev, devid);

src/network/networkd-link.c

@@ -1784,6 +1784,9 @@ int link_save(Link *link) {
 
                 fputs("\n", f);
 
+                fprintf(f, "WILDCARD_DOMAIN=%s\n",
+                        yes_no(link->network->wildcard_domain));
+
                 fprintf(f, "LLMNR=%s\n",
                         llmnr_support_to_string(link->network->llmnr));
         }

src/network/networkd-network.c

@@ -351,6 +351,7 @@ int config_parse_domains(const char *unit,
                          const char *rvalue,
                          void *data,
                          void *userdata) {
+        Network *network = userdata;
         char ***domains = data;
         char **domain;
         int r;
@@ -362,6 +363,11 @@ int config_parse_domains(const char *unit,
 
         strv_uniq(*domains);
 
+        if (strv_isempty(*domains))
+                network->wildcard_domain = false;
+        else if (strv_find(*domains, "*"))
+                network->wildcard_domain = true;
+
         STRV_FOREACH(domain, *domains)
                 if (is_localhost(*domain) || !hostname_is_valid(*domain))
                         strv_remove(*domains, *domain);

src/network/networkd.h

@@ -111,6 +111,7 @@ struct Network {
         Hashmap *addresses_by_section;
         Hashmap *routes_by_section;
 
+        bool wildcard_domain;
         char **domains, **dns, **ntp;
 
         LLMNRSupport llmnr;