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use super::{CharacterString, DnsPacketContent, Name, TYPE};
use core::fmt::Debug;
use std::collections::HashMap;
mod a;
mod aaaa;
mod hinfo;
mod minfo;
mod mx;
mod null;
mod soa;
mod srv;
mod wks;
pub use a::A;
pub use aaaa::AAAA;
use byteorder::{BigEndian, ByteOrder};
pub use hinfo::HINFO;
pub use minfo::MINFO;
pub use mx::MX;
pub use null::NULL;
pub use soa::SOA;
pub use srv::SRV;
pub use wks::WKS;
#[derive(Debug, Eq, PartialEq, Hash)]
pub enum RData<'a> {
A(A),
AAAA(AAAA),
NS(Name<'a>),
MD(Name<'a>),
CNAME(Name<'a>),
MB(Name<'a>),
MG(Name<'a>),
MR(Name<'a>),
PTR(Name<'a>),
MF(Name<'a>),
HINFO(HINFO<'a>),
MINFO(MINFO<'a>),
MX(MX<'a>),
TXT(CharacterString<'a>),
SOA(Box<SOA<'a>>),
WKS(WKS<'a>),
SRV(Box<SRV<'a>>),
NULL(u16, NULL<'a>),
}
impl<'a> DnsPacketContent<'a> for RData<'a> {
fn parse(data: &'a [u8], position: usize) -> crate::Result<Self>
where
Self: Sized,
{
let rdatatype = BigEndian::read_u16(&data[position..position + 2]).into();
let rdatalen = BigEndian::read_u16(&data[position + 8..position + 10]) as usize;
parse_rdata(&data[position + 10..position + 10 + rdatalen], 0, rdatatype)
}
fn append_to_vec(&self, out: &mut Vec<u8>) -> crate::Result<()> {
match &self {
RData::A(data) => data.append_to_vec(out),
RData::AAAA(data) => data.append_to_vec(out),
RData::NS(data)
| RData::CNAME(data)
| RData::MB(data)
| RData::MG(data)
| RData::MR(data)
| RData::PTR(data)
| RData::MF(data)
| RData::MD(data) => data.append_to_vec(out),
RData::HINFO(data) => data.append_to_vec(out),
RData::MINFO(data) => data.append_to_vec(out),
RData::MX(data) => data.append_to_vec(out),
RData::NULL(_, data) => data.append_to_vec(out),
RData::TXT(data) => data.append_to_vec(out),
RData::SOA(data) => data.append_to_vec(out),
RData::WKS(data) => data.append_to_vec(out),
RData::SRV(data) => data.append_to_vec(out),
}
}
fn compress_append_to_vec(
&self,
out: &mut Vec<u8>,
name_refs: &mut HashMap<u64, usize>,
) -> crate::Result<()> {
match &self {
RData::A(data) => data.compress_append_to_vec(out, name_refs),
RData::AAAA(data) => data.compress_append_to_vec(out, name_refs),
RData::NS(data)
| RData::CNAME(data)
| RData::MB(data)
| RData::MG(data)
| RData::MR(data)
| RData::PTR(data)
| RData::MF(data)
| RData::MD(data) => data.compress_append_to_vec(out, name_refs),
RData::HINFO(data) => data.compress_append_to_vec(out, name_refs),
RData::MINFO(data) => data.compress_append_to_vec(out, name_refs),
RData::MX(data) => data.compress_append_to_vec(out, name_refs),
RData::NULL(_, data) => data.compress_append_to_vec(out, name_refs),
RData::TXT(data) => data.compress_append_to_vec(out, name_refs),
RData::SOA(data) => data.compress_append_to_vec(out, name_refs),
RData::WKS(data) => data.compress_append_to_vec(out, name_refs),
RData::SRV(data) => data.compress_append_to_vec(out, name_refs),
}
}
fn len(&self) -> usize {
match &self {
RData::A(data) => data.len(),
RData::AAAA(data) => data.len(),
RData::NS(data)
| RData::CNAME(data)
| RData::MB(data)
| RData::MG(data)
| RData::MR(data)
| RData::PTR(data)
| RData::MF(data)
| RData::MD(data) => data.len(),
RData::HINFO(data) => data.len(),
RData::MINFO(data) => data.len(),
RData::MX(data) => data.len(),
RData::NULL(_, data) => data.len(),
RData::TXT(data) => data.len(),
RData::SOA(data) => data.len(),
RData::WKS(data) => data.len(),
RData::SRV(data) => data.len(),
}
}
}
impl<'a> RData<'a> {
pub fn type_code(&self) -> TYPE {
match self {
RData::A(_) => TYPE::A,
RData::AAAA(_) => TYPE::AAAA,
RData::NS(_) => TYPE::NS,
RData::MD(_) => TYPE::MD,
RData::CNAME(_) => TYPE::CNAME,
RData::MB(_) => TYPE::MB,
RData::MG(_) => TYPE::MG,
RData::MR(_) => TYPE::MR,
RData::PTR(_) => TYPE::PTR,
RData::MF(_) => TYPE::MF,
RData::HINFO(_) => TYPE::HINFO,
RData::MINFO(_) => TYPE::MINFO,
RData::MX(_) => TYPE::MX,
RData::TXT(_) => TYPE::TXT,
RData::SOA(_) => TYPE::SOA,
RData::WKS(_) => TYPE::WKS,
RData::SRV(_) => TYPE::SRV,
RData::NULL(type_code, _) => TYPE::Unknown(*type_code),
}
}
}
fn parse_rdata(data: &[u8], position: usize, rdatatype: TYPE) -> crate::Result<RData> {
let rdata = match rdatatype {
TYPE::A => RData::A(A::parse(data, position)?),
TYPE::AAAA => RData::AAAA(AAAA::parse(data, position)?),
TYPE::NS => RData::NS(Name::parse(data, position)?),
TYPE::MD => RData::MD(Name::parse(data, position)?),
TYPE::CNAME => RData::CNAME(Name::parse(data, position)?),
TYPE::MB => RData::MB(Name::parse(data, position)?),
TYPE::MG => RData::MG(Name::parse(data, position)?),
TYPE::MR => RData::MR(Name::parse(data, position)?),
TYPE::PTR => RData::PTR(Name::parse(data, position)?),
TYPE::MF => RData::NS(Name::parse(data, position)?),
TYPE::SOA => RData::SOA(Box::new(SOA::parse(data, position)?)),
TYPE::WKS => RData::WKS(WKS::parse(data, position)?),
TYPE::HINFO => RData::HINFO(HINFO::parse(data, position)?),
TYPE::MINFO => RData::MINFO(MINFO::parse(data, position)?),
TYPE::MX => RData::MX(MX::parse(data, position)?),
TYPE::TXT => RData::TXT(CharacterString::parse(data, position)?),
TYPE::SRV => RData::SRV(Box::new(SRV::parse(data, position)?)),
rdatatype => RData::NULL(rdatatype.into(), NULL::parse(data, position)?),
};
Ok(rdata)
}