Module simple_dns::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