networkd: generate resolv.conf

This adds support to generate a basic resolv.conf in /run/systemd/network.
This file will not take any effect unless a symlink is created from
/etc/resolv.conf.

Nameservers received over DHCP takes precedence over statically configured ones.

Note: /etc/resolv.conf is severely limited, so in the future we will likely
rather provide a much more powerfull nss plugin (or something to that effect),
but this should allow current users to function without any loss of
functionality.

1 files changed, 8 insertions, 0 deletions

diff --git a/src/network/networkd-network.c b/src/network/networkd-network.c
index f2546440cf..f987310011 100644
--- a/src/network/networkd-network.c
+++ b/src/network/networkd-network.c
@@ -144,6 +144,8 @@ void network_free(Network *network) {
 
         free(network->description);
 
+        address_free(network->dns);
+
         while ((route = network->static_routes))
                 route_free(route);
 
@@ -197,6 +199,12 @@ int network_apply(Manager *manager, Network *network, Link *link) {
         if (r < 0)
                 return r;
 
+        if (network->dns) {
+                r = manager_update_resolv_conf(manager);
+                if (r < 0)
+                        return r;
+        }
+
         return 0;
 }