100 lines
2.6 KiB
Rust
100 lines
2.6 KiB
Rust
use bytes::Bytes;
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use errors::*;
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use ser::DnsPacketData;
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use ser::text::{DnsTextData, DnsTextFormatter, next_field};
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use std::fmt;
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use std::io::Cursor;
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use records::registry::{name_to_type, type_name};
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use common_types::types;
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use std::borrow::Cow;
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#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
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pub struct Type(pub u16);
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impl Type {
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pub fn name(self) -> Cow<'static, str> {
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if let Some(name) = type_name(self) {
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Cow::Borrowed(name)
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} else {
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Cow::Owned(format!("TYPE{}", self.0))
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}
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}
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/// defined in RFC 1035
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pub fn well_known(self) -> bool {
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// 0x0001 (A) ... 0x0010 (TXT) are defined in RFC 1035
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self.0 >= 0x0001 && self.0 <= 0x0010
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}
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/// require converting to canonical form for DNSSEC (i.e. names
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/// must be converted to (ASCII) lower case, no compression)
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///
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/// See https://tools.ietf.org/html/rfc4034#section-6.2 (updates RFC 3597).
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pub fn canonical(self) -> bool {
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match self {
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types::NS => true,
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types::MD => true,
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types::MF => true,
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types::CNAME => true,
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types::SOA => true,
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types::MB => true,
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types::MG => true,
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types::MR => true,
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types::PTR => true,
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// types::HINFO => true, // doesn't have a name in data
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types::MINFO => true,
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types::MX => true,
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// types::HINFO => true, // see above, also duplicate in the RFCs
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types::RP => true,
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types::AFSDB => true,
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types::RT => true,
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types::NSAP_PTR => true, // not listed in the RFCs, but probably should be.
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types::SIG => true,
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types::PX => true,
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types::NXT => true,
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types::SRV => true, // moved up to match numeric order
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types::NAPTR => true,
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types::KX => true,
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// types::SRV => true, // moved up to match numeric order
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types::A6 => true, // moved up to match numeric order
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types::DNAME => true,
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// types::A6 => true, // moved up to match numeric order
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types::RRSIG => true,
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types::NSEC => true,
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_ => false,
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}
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}
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}
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impl fmt::Display for Type {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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if let Some(name) = type_name(*self) {
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write!(f, "{}", name)
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} else {
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write!(f, "TYPE{}", self.0)
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}
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}
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}
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impl DnsPacketData for Type {
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fn deserialize(data: &mut Cursor<Bytes>) -> Result<Self> {
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Ok(Type(DnsPacketData::deserialize(data)?))
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}
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}
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impl DnsTextData for Type {
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fn dns_parse(data: &mut &str) -> Result<Self> {
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let field = next_field(data)?;
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if field.starts_with("TYPE") || field.starts_with("type") {
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if let Ok(t) = field[4..].parse::<u16>() {
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return Ok(Type(t));
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}
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}
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name_to_type(field).ok_or_else(|| format_err!("unknown type {:?}", field))
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}
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fn dns_format(&self, f: &mut DnsTextFormatter) -> fmt::Result {
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write!(f, "{}", self)
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}
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}
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