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resolved: when configuring 127.0.0.1 as per-interface DNS server, contact it via "lo" always

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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
This commit is contained in:
Lennart Poettering 2022-11-18 16:52:06 +01:00
parent 5faaed5b62
commit 6e32414a66
1 changed files with 5 additions and 0 deletions
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5
src/resolve/resolved-dns-server.c
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@ -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;