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resolved: suppress writing DNS server info into /etc/resolv.conf for non-standard UDP ports

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glibc doesn't support this, hence don#t generate it.

Fixes: #20836
This commit is contained in:
Lennart Poettering 2021-09-27 14:28:16 +02:00 committed by Yu Watanabe
parent 3542da2442
commit a50dadf2fd
1 changed files with 7 additions and 0 deletions
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7
src/resolve/resolved-resolv-conf.c
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@ -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) */