resolve/mdns: allow mDNS queries with truncation flag

If the query has many Known-Answers records, then the truncation flag is set. Fixes #29168.
2023-11-08 22:45:14 +09:00
parent 614af79cfc
commit 6f087266e3
1 changed files with 3 additions and 3 deletions
@@ -307,13 +307,13 @@ int dns_packet_validate_query(DnsPacket *p) {
        if (DNS_PACKET_OPCODE(p) != 0)
                return -EBADMSG;

-        if (DNS_PACKET_TC(p))
-                return -EBADMSG;
-
        switch (p->protocol) {

        case DNS_PROTOCOL_LLMNR:
        case DNS_PROTOCOL_DNS:
+                if (DNS_PACKET_TC(p)) /* mDNS query may have truncation flag. */
+                        return -EBADMSG;
+
                /* RFC 4795, Section 2.1.1. says to discard all queries with QDCOUNT != 1 */
                if (DNS_PACKET_QDCOUNT(p) != 1)
                        return -EBADMSG;