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Ignore the class for OPT records

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This commit is contained in:
Frank Denis 2018-07-07 22:01:35 +02:00
parent a3ee3f3198
commit eddb36b541
1 changed files with 2 additions and 6 deletions
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8
src/dns.rs
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@ -1,4 +1,3 @@
const DNS_CLASS_IN: u16 = 1;
const DNS_HEADER_SIZE: usize = 12;
const DNS_MAX_HOSTNAME_LEN: usize = 256;
const DNS_MAX_PACKET_SIZE: usize = 65_535;
@ -100,17 +99,14 @@ pub fn min_ttl(
return Err("Short packet");
}
let qtype = u16::from(packet[offset]) << 8 | u16::from(packet[offset + 1]);
let qclass = u16::from(packet[offset + 2]) << 8 | u16::from(packet[offset + 3]);
let ttl = u32::from(packet[offset + 4]) << 24
| u32::from(packet[offset + 5]) << 16
| u32::from(packet[offset + 6]) << 8
| u32::from(packet[offset + 7]);
let rdlen = (u16::from(packet[offset + 8]) << 8 | u16::from(packet[offset + 9])) as usize;
offset += 10;
if !(qtype == DNS_TYPE_OPT && qclass == DNS_CLASS_IN) {
if ttl < found_min_ttl {
found_min_ttl = ttl;
}
if qtype != DNS_TYPE_OPT && ttl < found_min_ttl {
found_min_ttl = ttl;
}
if rdlen > packet_len - offset {
return Err("Record length would exceed packet length");