resolved: reset RR TTL to 0, if MSB is set

RFC 2181, Section 8 suggests to treat an RR TTL with the MSB set as 0. Implement this.
2015-12-29 21:42:09 +01:00
parent 9a1f0c283b
commit 0d0b52d79c
1 changed files with 5 additions and 0 deletions
@@ -1580,6 +1580,11 @@ int dns_packet_read_rr(DnsPacket *p, DnsResourceRecord **ret, bool *ret_cache_fl
        if (r < 0)
                goto fail;

+        /* RFC 2181, Section 8, suggests to
+         * treat a TTL with the MSB set as a zero TTL. */
+        if (rr->ttl & UINT32_C(0x80000000))
+                rr->ttl = 0;
+
        r = dns_packet_read_uint16(p, &rdlength, NULL);
        if (r < 0)
                goto fail;