90 lines
2.4 KiB
Rust
90 lines
2.4 KiB
Rust
use bytes::{Bytes, BufMut};
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use common_types::*;
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use common_types::binary::HEXLOWER_PERMISSIVE_ALLOW_WS;
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use errors::*;
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use failure::{ResultExt, Fail};
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use ser::packet::{DnsPacketWriteContext, remaining_bytes};
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use ser::{RRData, RRDataPacket, RRDataText};
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use ser::text::{DnsTextFormatter, DnsTextContext, next_field};
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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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#[derive(Clone, PartialEq, Eq, Debug)]
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pub struct UnknownRecord {
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rr_type: Type,
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raw: Bytes,
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}
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impl UnknownRecord {
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pub fn new(rr_type: Type, raw: Bytes) -> Self {
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UnknownRecord {
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rr_type: rr_type,
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raw: raw,
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}
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}
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pub fn deserialize(rr_type: Type, data: &mut ::std::io::Cursor<Bytes>) -> Result<Self> {
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Ok(UnknownRecord::new(rr_type, remaining_bytes(data)))
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}
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pub fn dns_parse(rr_type: Type, data: &mut &str) -> Result<Self> {
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let field = next_field(data)?;
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ensure!(field == r"\#", "expect \\# token to mark generic encoding");
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let field = next_field(data).context("generic record data length")?;
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let len: usize = field.parse()?;
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let result = HEXLOWER_PERMISSIVE_ALLOW_WS.decode(data.as_bytes())
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.with_context(|e| e.context(format!("invalid hex: {:?}", data)))?;
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ensure!(len == result.len(), "length {} doesn't match length of encoded data {}", len, result.len());
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*data = ""; // read all data
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Ok(UnknownRecord {
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rr_type,
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raw: result.into(),
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})
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}
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}
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impl RRDataPacket for UnknownRecord {
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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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UnknownRecord::deserialize(rr_type, data)
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}
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fn rr_type(&self) -> Type {
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self.rr_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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packet.reserve(self.raw.len());
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packet.put_slice(&self.raw);
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Ok(())
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}
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}
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impl RRDataText for UnknownRecord {
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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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let t = match context.record_type() {
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Some(t) => t,
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None => bail!("must parse DNS record with record type context"),
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};
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UnknownRecord::dns_parse(t, data)
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}
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/// this must never fail unless the underlying buffer fails.
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fn dns_format_rr_data(&self, f: &mut DnsTextFormatter) -> fmt::Result {
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write!(f, "\\# {} {}", self.raw.len(), HEXLOWER_PERMISSIVE_ALLOW_WS.encode(&self.raw))
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}
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fn rr_type_txt(&self) -> Cow<'static, str> {
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Cow::Owned(self.rr_type.generic_name())
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}
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}
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impl RRData for UnknownRecord {
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}
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