The resolvconf compatibility parser ignored errors from
nameserver, domain, and search lines. If one of those lines was
malformed, resolvectl could still send the partially parsed
configuration to resolved and overwrite the previous link state.
Reproducer:
IF=enp1s0
TMP="$(mktemp -d)"
ln -s "$(command -v resolvectl)" "$TMP/resolvconf"
sudo resolvectl dns "$IF" 1.1.1.1
sudo resolvectl domain "$IF" keep.example
resolvectl domain "$IF"
printf 'nameserver 1.1.1.1\nsearch "unterminated\n' |
sudo "$TMP/resolvconf" -a "$IF" || true
resolvectl domain "$IF"
Before:
The malformed search line was ignored and the previous domain
was cleared:
Link 2 (enp1s0): keep.example
Link 2 (enp1s0):
After:
The malformed input fails before updating resolved, so
keep.example remains configured.
Follow-up for: 097f130731
dongshengyuan
253b34d8ac