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macro_rules! rr_wrapper {
(#[doc=$doc:expr] $t:ident: $w:ident = $c:literal) => {
#[derive(Debug, PartialEq, Eq, Hash, Clone)]
#[doc = $doc]
pub struct $t<'a>(pub $w<'a>);
impl<'a> RR for $t<'a> {
const TYPE_CODE: u16 = $c;
}
impl<'a> From<$w<'a>> for $t<'a> {
fn from(value: $w<'a>) -> Self {
$t(value)
}
}
impl<'a> $t<'a> {
/// Transforms the inner data into its owned type
pub fn into_owned<'b>(self) -> $t<'b> {
$t(self.0.into_owned())
}
}
impl<'a> WireFormat<'a> for $t<'a> {
const MINIMUM_LEN: usize = 0;
fn parse(data: &mut BytesBuffer<'a>) -> crate::Result<Self>
where
Self: Sized,
{
$w::parse(data).map(|n| $t(n))
}
fn write_to<T: Write>(&self, out: &mut T) -> crate::Result<()> {
self.0.write_to(out)
}
fn write_compressed_to<T: Write + Seek>(
&'a self,
out: &mut T,
name_refs: &mut crate::lib::BTreeMap<&[crate::Label<'a>], u16>,
) -> crate::Result<()> {
self.0.write_compressed_to(out, name_refs)
}
fn len(&self) -> usize {
self.0.len()
}
}
impl<'a> crate::lib::Deref for $t<'a> {
type Target = $w<'a>;
fn deref(&self) -> &Self::Target {
&self.0
}
}
impl<'a> crate::lib::DerefMut for $t<'a> {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.0
}
}
};
}
macro_rules! rdata_enum {
($($i:tt$(<$x:lifetime>)?,)+) => {
/// Represents the RData of each [`TYPE`]
#[derive(Debug, Eq, PartialEq, Hash, Clone)]
#[allow(missing_docs)]
pub enum RData<'a> {
$(
$i($i$(<$x>)?),
)+
NULL(u16, NULL<'a>),
Empty(TYPE)
}
impl<'a> WireFormat<'a> for RData<'a> {
const MINIMUM_LEN: usize = 10;
fn parse(data: &mut BytesBuffer<'a>) -> crate::Result<Self>
where
Self: Sized,
{
let rdatatype = data.get_u16()?.into();
let rdatalen = data.peek_u16_in(6)? as usize;
// OPT needs to look the ttl and class values, hence position will be advanced by OPT
// parsing code
if rdatatype == TYPE::OPT {
let mut opt_data = data.new_limited_to(rdatalen + 8)?;
return Ok(RData::OPT(OPT::parse(&mut opt_data)?))
}
data.advance(8)?;
if rdatalen == 0 {
return Ok(RData::Empty(rdatatype));
}
let mut data = data.new_limited_to(rdatalen)?;
parse_rdata(&mut data, rdatatype)
}
fn write_to<T: Write>(
&self,
out: &mut T,
) -> crate::Result<()> {
match &self {
$(
RData::$i(data) => data.write_to(out),
)+
RData::NULL(_, data) => data.write_to(out),
RData::Empty(_) => { Ok(()) },
}
}
fn write_compressed_to<T: Write + Seek>(
&'a self,
out: &mut T,
name_refs: &mut crate::lib::BTreeMap<&[crate::Label<'a>], u16>,
) -> crate::Result<()> {
match &self {
$(
RData::$i(data) => data.write_compressed_to(out, name_refs),
)+
RData::NULL(_, data) => data.write_compressed_to(out, name_refs),
RData::Empty(_) => { Ok(()) },
}
}
fn len(&self) -> usize {
match &self {
$(
RData::$i(data) => data.len(),
)+
RData::NULL(_, data) => data.len(),
RData::Empty(_) => 0,
}
}
}
impl<'a> RData<'a> {
/// Returns the [`TYPE`] of this RData
pub fn type_code(&self) -> TYPE {
match self {
$(
RData::$i(_) => TYPE::$i,
)+
RData::NULL(type_code, _) => TYPE::Unknown(*type_code),
RData::Empty(ty) => *ty
}
}
/// Transforms the inner data into its owned type
pub fn into_owned<'b>(self) -> RData<'b> {
match self {
$(
RData::$i(data) => RData::$i(data.into_owned()),
)+
RData::NULL(rdatatype, data) => RData::NULL(rdatatype, data.into_owned()),
RData::Empty(ty) => RData::Empty(ty)
}
}
}
fn parse_rdata<'a>(data: &mut BytesBuffer<'a>, rdatatype: TYPE) -> crate::Result<RData<'a>> {
let rdata = match rdatatype {
$(
TYPE::$i => RData::$i($i::parse(data)?),
)+
TYPE::NULL => RData::NULL(rdatatype.into(), NULL::parse(data)?),
TYPE::Unknown(rdatatype) => RData::NULL(rdatatype, NULL::parse(data)?),
};
Ok(rdata)
}
/// Possible TYPE values in DNS Resource Records
/// Each value is described according to its own RFC
#[derive(Debug, Copy, Clone, PartialEq, Eq, Hash)]
#[allow(missing_docs)]
#[non_exhaustive]
pub enum TYPE {
$( $i,)+
NULL,
Unknown(u16)
}
impl From<TYPE> for u16 {
fn from(value: TYPE) -> Self {
match value {
$(
TYPE::$i => $i::TYPE_CODE,
)+
TYPE::NULL => NULL::TYPE_CODE,
TYPE::Unknown(x) => x,
}
}
}
impl From<u16> for TYPE {
fn from(value: u16) -> Self {
match value {
$(
$i::TYPE_CODE => TYPE::$i,
)+
NULL::TYPE_CODE => TYPE::NULL,
v => TYPE::Unknown(v),
}
}
}
}
}
pub(crate) use rdata_enum;
pub(crate) use rr_wrapper;