From 11132a6c20b64eb14a3386ff480086b5bae72146 Mon Sep 17 00:00:00 2001
From: Yu Watanabe <watanabe.yu+github@gmail.com>
Date: Fri, 4 Nov 2022 12:06:21 +0900
Subject: [PATCH] resolve: enable per-link mDNS setting by default

Otherwise, if the link is not managed by systemd-networkd, mDNS cannot
be enabled without calling `resolvectl` explicitly.

Fixes #25252.

(cherry picked from commit e31540196b8fb136a8f197c7a26d851bd0b93329)

Related: #2138081
---
 src/resolve/resolved-link-bus.c | 2 +-
 src/resolve/resolved-link.c     | 8 ++++----
 2 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/resolve/resolved-link-bus.c b/src/resolve/resolved-link-bus.c
index 1f7d092112..9b6d14f20c 100644
--- a/src/resolve/resolved-link-bus.c
+++ b/src/resolve/resolved-link-bus.c
@@ -562,7 +562,7 @@ int bus_link_method_set_mdns(sd_bus_message *message, void *userdata, sd_bus_err
                 return r;
 
         if (isempty(mdns))
-                mode = RESOLVE_SUPPORT_NO;
+                mode = RESOLVE_SUPPORT_YES;
         else {
                 mode = resolve_support_from_string(mdns);
                 if (mode < 0)
diff --git a/src/resolve/resolved-link.c b/src/resolve/resolved-link.c
index 86112f3a3b..d41f6f3e54 100644
--- a/src/resolve/resolved-link.c
+++ b/src/resolve/resolved-link.c
@@ -37,7 +37,7 @@ int link_new(Manager *m, Link **ret, int ifindex) {
                 .ifindex = ifindex,
                 .default_route = -1,
                 .llmnr_support = RESOLVE_SUPPORT_YES,
-                .mdns_support = RESOLVE_SUPPORT_NO,
+                .mdns_support = RESOLVE_SUPPORT_YES,
                 .dnssec_mode = _DNSSEC_MODE_INVALID,
                 .dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID,
                 .operstate = IF_OPER_UNKNOWN,
@@ -64,7 +64,7 @@ void link_flush_settings(Link *l) {
 
         l->default_route = -1;
         l->llmnr_support = RESOLVE_SUPPORT_YES;
-        l->mdns_support = RESOLVE_SUPPORT_NO;
+        l->mdns_support = RESOLVE_SUPPORT_YES;
         l->dnssec_mode = _DNSSEC_MODE_INVALID;
         l->dns_over_tls_mode = _DNS_OVER_TLS_MODE_INVALID;
 
@@ -354,7 +354,7 @@ static int link_update_mdns_support(Link *l) {
 
         assert(l);
 
-        l->mdns_support = RESOLVE_SUPPORT_NO;
+        l->mdns_support = RESOLVE_SUPPORT_YES;
 
         r = sd_network_link_get_mdns(l->ifindex, &b);
         if (r == -ENODATA)
@@ -1156,7 +1156,7 @@ static bool link_needs_save(Link *l) {
                 return false;
 
         if (l->llmnr_support != RESOLVE_SUPPORT_YES ||
-            l->mdns_support != RESOLVE_SUPPORT_NO ||
+            l->mdns_support != RESOLVE_SUPPORT_YES ||
             l->dnssec_mode != _DNSSEC_MODE_INVALID ||
             l->dns_over_tls_mode != _DNS_OVER_TLS_MODE_INVALID)
                 return true;