From cea9e1619a0b150b08d5481f01546b7a898aad01 Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 18 Oct 2024 11:30:12 +0200
Subject: [PATCH] resolved: refresh resolv.conf files when link goes away

This might have the effect that some DNS server or search domain
disappears, hence rewrite the relevant files.

See: #27543
(cherry picked from commit 562f7bde8872b4fd03db11bf25c9dd294fd2c186)
(cherry picked from commit 72806073770393982a50aed54c40164105c9bf14)
(cherry picked from commit 1de3aa4ec90cfa3f6568426982207141a1feabf0)
---
 src/resolve/resolved-manager.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/resolve/resolved-manager.c b/src/resolve/resolved-manager.c
index e6715ab574..cfb049aeb8 100644
--- a/src/resolve/resolved-manager.c
+++ b/src/resolve/resolved-manager.c
@@ -93,6 +93,9 @@ static int manager_process_link(sd_netlink *rtnl, sd_netlink_message *mm, void *
                         log_debug("Removing link %i/%s", l->ifindex, l->ifname);
                         link_remove_user(l);
                         link_free(l);
+
+                        /* Make sure DNS servers are dropped from written resolv.conf if their link goes away */
+                        manager_write_resolv_conf(m);
                 }
 
                 break;