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use {Name, Error};
use byteorder::{BigEndian, ByteOrder};
#[derive(Debug, Clone, Copy)]
pub struct Record<'a> {
pub preference: u16,
pub exchange: Name<'a>,
}
impl<'a> super::Record<'a> for Record<'a> {
const TYPE: isize = 15;
fn parse(rdata: &'a [u8], original: &'a [u8]) -> super::RDataResult<'a> {
if rdata.len() < 3 {
return Err(Error::WrongRdataLength);
}
let record = Record {
preference: BigEndian::read_u16(&rdata[..2]),
exchange: Name::scan(&rdata[2..], original)?,
};
Ok(super::RData::MX(record))
}
}
#[cfg(test)]
mod test {
use {Packet, Header};
use Opcode::*;
use ResponseCode::NoError;
use QueryType as QT;
use QueryClass as QC;
use Class as C;
use RData;
use super::*;
#[test]
fn parse_response() {
let response = b"\xe3\xe8\x81\x80\x00\x01\x00\x05\x00\x00\x00\x00\
\x05gmail\x03com\x00\x00\x0f\x00\x01\xc0\x0c\x00\x0f\x00\x01\
\x00\x00\x04|\x00\x1b\x00\x05\rgmail-smtp-in\x01l\x06google\xc0\
\x12\xc0\x0c\x00\x0f\x00\x01\x00\x00\x04|\x00\t\x00\
\n\x04alt1\xc0)\xc0\x0c\x00\x0f\x00\x01\x00\x00\x04|\
\x00\t\x00(\x04alt4\xc0)\xc0\x0c\x00\x0f\x00\x01\x00\
\x00\x04|\x00\t\x00\x14\x04alt2\xc0)\xc0\x0c\x00\x0f\
\x00\x01\x00\x00\x04|\x00\t\x00\x1e\x04alt3\xc0)";
let packet = Packet::parse(response).unwrap();
assert_eq!(packet.header, Header {
id: 58344,
query: false,
opcode: StandardQuery,
authoritative: false,
truncated: false,
recursion_desired: true,
recursion_available: true,
authenticated_data: false,
checking_disabled: false,
response_code: NoError,
questions: 1,
answers: 5,
nameservers: 0,
additional: 0,
});
assert_eq!(packet.questions.len(), 1);
assert_eq!(packet.questions[0].qtype, QT::MX);
assert_eq!(packet.questions[0].qclass, QC::IN);
assert_eq!(&packet.questions[0].qname.to_string()[..],
"gmail.com");
assert_eq!(packet.answers.len(), 5);
let items = vec![
( 5, "gmail-smtp-in.l.google.com"),
(10, "alt1.gmail-smtp-in.l.google.com"),
(40, "alt4.gmail-smtp-in.l.google.com"),
(20, "alt2.gmail-smtp-in.l.google.com"),
(30, "alt3.gmail-smtp-in.l.google.com"),
];
for i in 0..5 {
assert_eq!(&packet.answers[i].name.to_string()[..],
"gmail.com");
assert_eq!(packet.answers[i].cls, C::IN);
assert_eq!(packet.answers[i].ttl, 1148);
match *&packet.answers[i].data {
RData::MX( Record { preference, exchange }) => {
assert_eq!(preference, items[i].0);
assert_eq!(exchange.to_string(), (items[i].1).to_string());
}
ref x => panic!("Wrong rdata {:?}", x),
}
}
}
}