98 lines
2.5 KiB
Rust
98 lines
2.5 KiB
Rust
use bytes::Bytes;
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use common_types::{Class, Type, classes};
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use errors::*;
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use ser::DnsPacketData;
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use ser::text::{DnsTextData, DnsTextFormatter, DnsTextContext};
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use std::borrow::Cow;
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use std::fmt;
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use std::io::Cursor;
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pub trait RRDataPacket {
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fn deserialize_rr_data(ttl: u32, rr_class: Class, rr_type: Type, data: &mut Cursor<Bytes>) -> Result<Self>
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where
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Self: Sized,
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;
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fn rr_type(&self) -> Type;
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}
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impl<T: DnsPacketData + StaticRRData> RRDataPacket for T {
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fn deserialize_rr_data(_ttl: u32, rr_class: Class, rr_type: Type, data: &mut Cursor<Bytes>) -> Result<Self> {
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ensure!(rr_type == T::TYPE, "type mismatch");
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if T::CLASS != classes::ANY {
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ensure!(rr_class == T::CLASS, "class mismatch: got {}, need {}", rr_class, T::CLASS);
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}
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T::deserialize(data)
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}
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fn rr_type(&self) -> Type {
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T::TYPE
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}
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}
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pub trait RRDataText {
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fn dns_parse_rr_data(context: &DnsTextContext, data: &mut &str) -> Result<Self>
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where
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Self: Sized,
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;
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// format might fail if there is no (known) text representation.
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fn dns_format_rr_data(&self, f: &mut DnsTextFormatter) -> fmt::Result;
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fn rr_type_txt(&self) -> Cow<'static, str> {
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unimplemented!()
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}
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// (type, rrdata)
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fn text(&self) -> Result<(String, String)> {
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use std::fmt::Write;
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let mut buf = String::new();
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match write!(&mut buf, "{}", DnsDisplayRR(self)) {
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Ok(()) => {
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return Ok((self.rr_type_txt().into(), buf))
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},
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Err(_) => (),
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}
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buf.clear();
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unimplemented!()
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}
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}
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impl<T: DnsTextData + StaticRRData> RRDataText for T {
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fn dns_parse_rr_data(context: &DnsTextContext, data: &mut &str) -> Result<Self>
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where
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Self: Sized,
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{
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ensure!(context.record_type() == Some(T::TYPE), "type mismatch");
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let rr_class = context.zone_class().expect("require zone CLASS to parse record");
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if T::CLASS != classes::ANY {
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ensure!(rr_class == T::CLASS, "class mismatch: got {}, need {}", rr_class, T::CLASS);
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}
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ensure!(context.last_ttl().is_some(), "require TTL to parse record");
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T::dns_parse(context, data)
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}
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fn dns_format_rr_data(&self, f: &mut DnsTextFormatter) -> fmt::Result {
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self.dns_format(f)
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}
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}
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#[derive(Debug)]
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pub struct DnsDisplayRR<'a, T: RRDataText + ?Sized + 'a>(pub &'a T);
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impl<'a, T: RRDataText + ?Sized + 'a> fmt::Display for DnsDisplayRR<'a, T> {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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self.0.dns_format_rr_data(&mut DnsTextFormatter::new(f))
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}
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}
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pub trait RRData: RRDataPacket + RRDataText {
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}
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pub trait StaticRRData: RRData {
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const TYPE: Type;
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const NAME: &'static str;
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// classes::ANY marks class independent types
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const CLASS: Class;
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}
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