114 lines
3.2 KiB
Rust
114 lines
3.2 KiB
Rust
use bytes::Bytes;
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use crate::common_types::{Class, Type, classes};
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use crate::errors::*;
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use crate::records::UnknownRecord;
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use crate::ser::packet::{DnsPacketData, DnsPacketWriteContext};
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use crate::ser::text::{DnsTextData, DnsTextFormatter, DnsTextContext};
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use std::any::Any;
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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 use dnsbox_derive::RRData;
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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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fn serialize_rr_data(&self, context: &mut DnsPacketWriteContext, packet: &mut Vec<u8>) -> Result<()>;
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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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failure::ensure!(rr_type == T::TYPE, "type mismatch");
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if T::CLASS != classes::ANY {
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failure::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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fn serialize_rr_data(&self, context: &mut DnsPacketWriteContext, packet: &mut Vec<u8>) -> Result<()> {
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self.serialize(context, packet)
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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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}
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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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failure::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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failure::ensure!(rr_class == T::CLASS, "class mismatch: got {}, need {}", rr_class, T::CLASS);
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}
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failure::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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fn rr_type_txt(&self) -> Cow<'static, str> {
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Cow::Borrowed(T::NAME)
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}
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}
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pub trait RRData: RRDataPacket + RRDataText + fmt::Debug + 'static {
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fn clone_box(&self) -> Box<dyn RRData>;
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fn as_any(&self) -> &dyn Any;
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// (type, rrdata)
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fn text(&self) -> Result<(String, String)> {
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let mut buf = String::new();
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match self.dns_format_rr_data(&mut DnsTextFormatter::new(&mut buf)) {
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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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let mut raw = Vec::new();
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self.serialize_rr_data(&mut DnsPacketWriteContext::new(), &mut raw)?;
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let ur = UnknownRecord::new(self.rr_type(), raw.into());
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// formatting UnknownRecord should not fail
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buf.clear();
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ur.dns_format_rr_data(&mut DnsTextFormatter::new(&mut buf)).expect("formatting UnknownRecord must not fail");
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Ok((ur.rr_type_txt().into(), buf))
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}
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}
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impl Clone for Box<dyn RRData> {
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fn clone(&self) -> Self {
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self.clone_box()
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}
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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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