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resolve: synthesize null address, IPv4 broadcast address, or invalid domain

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These are filtered in `dns_scope_good_domain()`, but not synthesized.

Fixes #22229.

(cherry picked from commit 46b53e8035)
This commit is contained in:
Yu Watanabe 2022-01-24 06:36:53 +09:00 committed by Zbigniew Jędrzejewski-Szmek
parent 0fd3ccca64
commit 89b439ee00
1 changed files with 8 additions and 0 deletions
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8
src/resolve/resolved-dns-synthesize.c
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@ -397,6 +397,14 @@ int dns_synthesize_answer(
if (dns_name_is_empty(name)) { if (dns_name_is_empty(name)) {
/* Do nothing. */ /* 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)) { } else if (is_localhost(name)) {
r = synthesize_localhost_rr(m, key, ifindex, &answer); r = synthesize_localhost_rr(m, key, ifindex, &answer);