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resolved: don't discard mDNS queries with bad flags

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Even though RFC 6762 specifies these bits MUST be zero, it also says they MUST
be ignored on reception.
This commit is contained in:
Sergey Bugaev
2021-02-19 15:29:02 +03:00
committed by Lennart Poettering
parent 7675501540
commit 2aaf376597
1 changed files with 4 additions and 7 deletions
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11
src/resolve/resolved-dns-packet.c
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@@ -326,13 +326,10 @@ int dns_packet_validate_query(DnsPacket *p) {
break;
case DNS_PROTOCOL_MDNS:
/* RFC 6762, Section 18 */
if (DNS_PACKET_AA(p) != 0 ||
DNS_PACKET_RD(p) != 0 ||
DNS_PACKET_RA(p) != 0 ||
DNS_PACKET_AD(p) != 0 ||
DNS_PACKET_CD(p) != 0 ||
DNS_PACKET_RCODE(p) != 0)
/* RFC 6762, Section 18 specifies that messages with non-zero RCODE
* must be silently ignored, and that we must ignore the values of
* AA, RD, RA, AD, and CD bits. */
if (DNS_PACKET_RCODE(p) != 0)
return -EBADMSG;
break;