Query Internet-class DNS mail records

2026-07-24 14:26:35 +02:00
parent 3592a5a47a
commit b602315ed9
1 changed files with 4 additions and 1 deletions
@@ -389,7 +389,10 @@ _XplDns_Query(const char *domain, XplDns_RecordType type)
 	result->dnssec_authenticated = 0;

 	// FIXME: is this re-entrant _everywhere_ ?
-	answer_len = res_query(domain, ns_c_any, type, answer_buffer, 4096);
+	/* DNS mail records are Internet-class data.  ns_c_any is class 255,
+	 * not an instruction to accept any result, and authoritative servers
+	 * are not required to answer MX/A/TXT questions sent with that class. */
+	answer_len = res_query(domain, ns_c_in, type, answer_buffer, 4096);

 	if (answer_len < 0) {
 		// didn't get a sensible answer