resolved: skip IPv6 LLMNR if IPv6 is not available

[elogind.git] / src / resolve / resolved-manager.c

diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index 6bb089451f1b8d1a09d07f1df4e1abe3eb9fb3ff..84dad92c53eb81cbf99853f130b761ae9cf45c03 100644 (file)
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -426,23 +426,25 @@ static int manager_llmnr_start(Manager *m) {
         if (r < 0)
                 return r;
 
-        r = manager_llmnr_ipv6_udp_fd(m);
-        if (r == -EADDRINUSE)
-                goto eaddrinuse;
-        if (r < 0)
-                return r;
-
         r = manager_llmnr_ipv4_tcp_fd(m);
         if (r == -EADDRINUSE)
                 goto eaddrinuse;
         if (r < 0)
                 return r;
 
-        r = manager_llmnr_ipv6_tcp_fd(m);
-        if (r == -EADDRINUSE)
-                goto eaddrinuse;
-        if (r < 0)
-                return r;
+        if (socket_ipv6_is_supported()) {
+                r = manager_llmnr_ipv6_udp_fd(m);
+                if (r == -EADDRINUSE)
+                        goto eaddrinuse;
+                if (r < 0)
+                        return r;
+
+                r = manager_llmnr_ipv6_tcp_fd(m);
+                if (r == -EADDRINUSE)
+                        goto eaddrinuse;
+                if (r < 0)
+                        return r;
+        }
 
         return 0;
 
@@ -450,6 +452,7 @@ eaddrinuse:
         log_warning("There appears to be another LLMNR respondering running. Turning off LLMNR support.");
         m->llmnr_support = SUPPORT_NO;
         manager_llmnr_stop(m);
+
         return 0;
 }
 
@@ -536,10 +539,8 @@ Manager *manager_free(Manager *m) {
 
         dns_scope_free(m->unicast_scope);
 
-        while (m->dns_servers)
-                dns_server_free(m->dns_servers);
-        while (m->fallback_dns_servers)
-                dns_server_free(m->fallback_dns_servers);
+        manager_flush_dns_servers(m, DNS_SERVER_SYSTEM);
+        manager_flush_dns_servers(m, DNS_SERVER_FALLBACK);
 
         hashmap_free(m->links);
         hashmap_free(m->dns_transactions);
@@ -1771,6 +1772,18 @@ void manager_verify_all(Manager *m) {
                 dns_zone_verify_all(&s->zone);
 }
 
+void manager_flush_dns_servers(Manager *m, DnsServerType t) {
+        assert(m);
+
+        if (t == DNS_SERVER_SYSTEM)
+                while (m->dns_servers)
+                        dns_server_free(m->dns_servers);
+
+        if (t == DNS_SERVER_FALLBACK)
+                while (m->fallback_dns_servers)
+                        dns_server_free(m->fallback_dns_servers);
+}
+
 static const char* const support_table[_SUPPORT_MAX] = {
         [SUPPORT_NO] = "no",
         [SUPPORT_YES] = "yes",