From a3d2c2b669149fe7e1bfdfa0c72c39653bef2e4c Mon Sep 17 00:00:00 2001 From: Yu Watanabe Date: Mon, 24 Jan 2022 06:36:53 +0900 Subject: [PATCH] resolve: synthesize null address, IPv4 broadcast address, or invalid domain These are filtered in `dns_scope_good_domain()`, but not synthesized. Fixes #22229. (cherry picked from commit 46b53e8035fb60c9a7f26dd32d6689ab3b7da97c) (cherry picked from commit 89b439ee00e3fbee47cda3f790cbf320538cae7f) Conflict:NA Reference:https://github.com/systemd/systemd/commit/a3d2c2b669149fe7e1bfdfa0c72c39653bef2e4c --- src/resolve/resolved-dns-synthesize.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/resolve/resolved-dns-synthesize.c b/src/resolve/resolved-dns-synthesize.c index ea239e686d..0914515fdf 100644 --- a/src/resolve/resolved-dns-synthesize.c +++ b/src/resolve/resolved-dns-synthesize.c @@ -397,6 +397,14 @@ int dns_synthesize_answer( if (dns_name_is_empty(name)) { /* Do nothing. */ + } else if (dns_name_endswith(name, "0.in-addr.arpa") > 0 || + dns_name_equal(name, "255.255.255.255.in-addr.arpa") > 0 || + dns_name_equal(name, "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.ip6.arpa") > 0 || + dns_name_endswith(name, "invalid") > 0) { + + nxdomain = true; + continue; + } else if (is_localhost(name)) { r = synthesize_localhost_rr(m, key, ifindex, &answer); -- 2.33.0