Function add_edns_section

src/dns.rs:407–428

(packet: &mut Vec<u8>, max_payload_size: u16)

}

fn add_edns_section(packet: &mut Vec<u8>, max_payload_size: u16) -> Result<(), Error> {
    let opt_rr: [u8; 11] = [
        0,
        (DNS_TYPE_OPT >> 8) as u8,
        DNS_TYPE_OPT as u8,
        (max_payload_size >> 8) as u8,
        max_payload_size as u8,
        0,
        0,
        0,
        0,
        0,
        0,
    ];
    ensure!(
        DNS_MAX_PACKET_SIZE - packet.len() >= opt_rr.len(),
        "Packet would be too large to add a new record"
    );
    arcount_inc(packet)?;
    packet.extend(opt_rr);
    Ok(())
}

pub fn set_edns_max_payload_size(packet: &mut Vec<u8>, max_payload_size: u16) -> Result<(), Error> {
    let packet_len = packet.len();