Module header_buffer

Helper functions to assert a buffer for the header flags of a DNS Packet. Useful for checking the header without parsing the whole packet.
WARNING: Flags and RCODE information may be incomplete if the packet contains EDNS (OPT) or DNSSEC Resource Records

use simple_dns::{header_buffer, PacketFlag};

let buffer = b"\xff\xff\x03\x00\x00\x02\x00\x02\x00\x02\x00\x02";
assert_eq!(u16::MAX, header_buffer::id(&buffer[..]).unwrap());
assert!(!header_buffer::has_flags(&buffer[..], PacketFlag::RESPONSE).unwrap());

Functions

additional_records

Returns the additional records from the header buffer

answers

Returns the answers count from the header buffer

has_flags

Verify if buffer has the flags set.
WARNING: This information may be wrong if there is an OPT record in packet

id

Returns the packet id from the header buffer

name_servers

Returns the name servers count from the header buffer

opcode

Get the OPCODE from the buffer

questions

Returns the questions count from the header buffer

rcode

Get the RCODE from the buffer.
WARNING: This information may be wrong if there is an OPT record in packet