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File _service:tar_scm:backport-resolved-suppress-writing-DNS-server-info-into-etc-r.patch of Package systemd
From 2b2804757c8520b5cc133d9a3078f6fbec4a69cb Mon Sep 17 00:00:00 2001 From: Lennart Poettering <lennart@poettering.net> Date: Mon, 27 Sep 2021 14:28:16 +0200 Subject: [PATCH] resolved: suppress writing DNS server info into /etc/resolv.conf for non-standard UDP ports glibc doesn't support this, hence don#t generate it. Fixes: #20836 (cherry picked from commit a50dadf2fd7413bbfc26af7e2ad2900b3e06af82) Conflict:NA Reference:https://github.com/systemd/systemd/commit/2b2804757c8520b5cc133d9a3078f6fbec4a69cb --- src/resolve/resolved-resolv-conf.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/src/resolve/resolved-resolv-conf.c b/src/resolve/resolved-resolv-conf.c index dd02d368e9..d5a77605a8 100644 --- a/src/resolve/resolved-resolv-conf.c +++ b/src/resolve/resolved-resolv-conf.c @@ -216,6 +216,13 @@ static void write_resolv_conf_server(DnsServer *s, FILE *f, unsigned *count) { return; } + /* resolv.conf simply doesn't support any other ports than 53, hence there's nothing much we can + * do — we have to suppress these entries */ + if (dns_server_port(s) != 53) { + log_debug("DNS server %s with non-standard UDP port number, suppressing from generated resolv.conf.", dns_server_string(s)); + return; + } + /* Check if the scope this DNS server belongs to is suitable as 'default' route for lookups; resolv.conf does * not have a syntax to express that, so it must not appear as a global name server to avoid routing unrelated * domains to it (which is a privacy violation, will most probably fail anyway, and adds unnecessary load) */ -- 2.33.0
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