systemd/SOURCES/0063-resolved-when-configuring-127.0.0.1-as-per-interface.patch

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2023-05-09 05:39:14 +00:00
From d8d96bce62e8597b8d35bed1d9e9cb103336fd6b Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 18 Nov 2022 16:52:06 +0100
Subject: [PATCH] resolved: when configuring 127.0.0.1 as per-interface DNS
server, contact it via "lo" always
ussually if you specify a DNS server on some interface then we'll use
that interface to talk to it. Let's override this for localhost
addresses, as they only really make sense on "lo".
Fixes: #25397
(cherry picked from commit 6e32414a66ff8dbcef233981a7066684d903ee9f)
Related: #2138081
---
src/resolve/resolved-dns-server.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/src/resolve/resolved-dns-server.c b/src/resolve/resolved-dns-server.c
index 04a4f53ed0..8ff513fa33 100644
--- a/src/resolve/resolved-dns-server.c
+++ b/src/resolve/resolved-dns-server.c
@@ -648,6 +648,11 @@ int dns_server_adjust_opt(DnsServer *server, DnsPacket *packet, DnsServerFeature
int dns_server_ifindex(const DnsServer *s) {
assert(s);
+ /* For loopback addresses, go via the loopback interface, regardless which interface this is linked
+ * to. */
+ if (in_addr_is_localhost(s->family, &s->address))
+ return LOOPBACK_IFINDEX;
+
/* The link ifindex always takes precedence */
if (s->link)
return s->link->ifindex;