use crate::{bytes_buffer::BytesBuffer, dns::WireFormat, lib::Cow, lib::Write};
use super::RR;
/// A DNS key record see [rfc4034](https://www.rfc-editor.org/rfc/rfc4034#section-2)
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
pub struct DNSKEY<'a> {
/// The flags field contains various flags that describe the key's properties
pub flags: u16,
/// The protocol field must be set to 3 per RFC4034
pub protocol: u8,
/// The algorithm field identifies the public key's cryptographic algorithm
pub algorithm: u8,
/// The public key field contains the cryptographic key material in base64 format
pub public_key: Cow<'a, [u8]>,
}
impl RR for DNSKEY<'_> {
const TYPE_CODE: u16 = 48;
}
impl<'a> WireFormat<'a> for DNSKEY<'a> {
const MINIMUM_LEN: usize = 4;
fn parse(data: &mut BytesBuffer<'a>) -> crate::Result<Self>
where
Self: Sized,
{
let flags = data.get_u16()?;
let protocol = data.get_u8()?;
let algorithm = data.get_u8()?;
let public_key = Cow::Borrowed(data.get_remaining());
Ok(Self {
flags,
protocol,
algorithm,
public_key,
})
}
fn write_to<T: Write>(&self, out: &mut T) -> crate::Result<()> {
out.write_all(&self.flags.to_be_bytes())?;
out.write_all(&[self.protocol])?;
out.write_all(&[self.algorithm])?;
out.write_all(&self.public_key)?;
Ok(())
}
fn len(&self) -> usize {
self.public_key.len() + Self::MINIMUM_LEN
}
}
impl DNSKEY<'_> {
/// Transforms the inner data into its owned type
pub fn into_owned<'b>(self) -> DNSKEY<'b> {
DNSKEY {
flags: self.flags,
protocol: self.protocol,
algorithm: self.algorithm,
public_key: Cow::Owned(self.public_key.into_owned()),
}
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::lib::{vec, Vec};
#[test]
fn parse_and_write_dnskey() {
let flags = 12345u16;
let protocol = 8u8;
let algorithm = 2u8;
let public_key = vec![1, 2, 3, 4, 5];
let rdata = DNSKEY {
flags,
protocol,
algorithm,
public_key: Cow::Owned(public_key),
};
let mut writer = Vec::new();
rdata.write_to(&mut writer).unwrap();
let rdata = DNSKEY::parse(&mut (&writer[..]).into()).unwrap();
assert_eq!(rdata.flags, flags);
assert_eq!(rdata.protocol, protocol);
assert_eq!(rdata.algorithm, algorithm);
assert_eq!(&*rdata.public_key, &[1, 2, 3, 4, 5]);
}
#[test]
#[cfg(feature = "std")]
fn parse_sample() -> Result<(), Box<dyn std::error::Error>> {
use crate::{rdata::RData, ResourceRecord};
let sample_file = std::fs::read("samples/zonefile/DNSKEY.sample")?;
let sample_rdata = match ResourceRecord::parse(&mut (&sample_file[..]).into())?.rdata {
RData::DNSKEY(rdata) => rdata,
_ => unreachable!(),
};
assert_eq!(sample_rdata.flags, 256);
assert_eq!(sample_rdata.protocol, 3);
assert_eq!(sample_rdata.algorithm, 5);
assert_eq!(
*sample_rdata.public_key,
*b"\x01\x03\xd2\x2a\x6c\xa7\x7f\x35\xb8\x93\x20\x6f\xd3\x5e\x4c\x50\x6d\x83\x78\x84\x37\x09\xb9\x7e\x04\x16\x47\xe1\xbf\xf4\x3d\x8d\x64\xc6\x49\xaf\x1e\x37\x19\x73\xc9\xe8\x91\xfc\xe3\xdf\x51\x9a\x8c\x84\x0a\x63\xee\x42\xa6\xd2\xeb\xdd\xbb\x97\x03\x5d\x21\x5a\xa4\xe4\x17\xb1\xfa\x45\xfa\x11\xa9\x74\x1e\xa2\x09\x8c\x1d\xfa\x5f\xb5\xfe\xb3\x32\xfd\x4b\xc8\x15\x20\x89\xae\xf3\x6b\xa6\x44\xcc\xe2\x41\x3b\x3b\x72\xbe\x18\xcb\xef\x8d\xa2\x53\xf4\xe9\x3d\x21\x03\x86\x6d\x92\x34\xa2\xe2\x8d\xf5\x29\xa6\x7d\x54\x68\xdb\xef\xe3"
);
Ok(())
}
}