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This commit is contained in:
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c4c84bd887
@ -1,3 +1,5 @@
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//! Types and constants for DNS CLASSes
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use bytes::Bytes;
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use errors::*;
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use ser::DnsPacketData;
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@ -6,13 +8,15 @@ use std::fmt;
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use std::io::Cursor;
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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 Class(pub u16);
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/// CLASS Internet
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pub const IN : Class = Class(KnownClass::IN as u16);
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/// CLASS "Chaos"
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pub const CH : Class = Class(KnownClass::CH as u16);
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/// CLASS "Hesiod"
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pub const HS : Class = Class(KnownClass::HS as u16);
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/// QCLASS NONE
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pub const NONE : Class = Class(KnownQClass::NONE as u16);
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/// QCLASS "*" (ANY)
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pub const ANY : Class = Class(KnownQClass::ANY as u16);
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#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
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@ -20,9 +24,12 @@ pub const ANY : Class = Class(KnownQClass::ANY as u16);
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#[allow(non_camel_case_types)]
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pub enum KnownClass {
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// try to list "original" rfc
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/// CLASS Internet
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IN = 0x0001, // RFC 1035
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// CS = 0x0002, // "CSNET"
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// CS = 0x0002, // "CSNET" (not just obsolete; unassigned in the IANA registry)
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/// CLASS "Chaos"
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CH = 0x0003, // "Chaos"
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/// CLASS "Hesiod"
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HS = 0x0004, // "Hesiod"
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}
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@ -31,83 +38,141 @@ pub enum KnownClass {
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#[allow(non_camel_case_types)]
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pub enum KnownQClass {
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// try to list "original" rfc
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/// QCLASS NONE
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NONE = 0x00fe, // RFC 2136
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ANY = 0x00ff, // RFC 1035: "*"
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/// QCLASS "*" (ANY)
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ANY = 0x00ff, // RFC 1035
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}
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/// DNS CLASS
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///
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/// Originally QCLASS was a superset of CLASS; RFC 6895 now defines:
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///
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/// > There are currently two subcategories of DNS CLASSes: normal,
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/// > data-containing classes; and QCLASSes that are only meaningful in
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/// > queries or updates.
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///
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/// ## `ANY`
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///
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/// QTYPE 255 either (rules from RFC 6895):
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///
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/// - doesn't have a mnemonic, violating the existence rule
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/// - has "*" as mnemonic, violating the formatting rule
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/// - has "ANY" as mnemonic, violating the uniquess rule (class ANY)
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///
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/// Solution: use "ANY" for type 255, don't accept "ANY" as class in
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/// places a type could be given too: `*_without_any`.
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///
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/// The QCLASS `ANY` is mostly useless anyway and shouldn't be used in
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/// normal queries.
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#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
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pub struct Class(pub u16);
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impl Class {
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pub fn name(self) -> Cow<'static, str> {
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Cow::Borrowed(match self {
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/// map to `KnownQClass`
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pub fn known_qclass(self) -> Option<KnownQClass> {
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Some(match self {
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NONE => KnownQClass::NONE,
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ANY => KnownQClass::ANY,
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_ => return None,
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})
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}
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/// whether class is known to be a QCLASS
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pub fn is_known_qclass(self) -> bool {
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self.known_qclass().is_some()
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}
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/// name for CLASS if known
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///
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/// Known CLASSes are represented using their known mnemonic, others
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/// return None.
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pub fn known_name(self) -> Option<&'static str> {
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Some(match self {
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IN => "IN",
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CH => "CH",
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HS => "HS",
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NONE => "NONE",
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ANY => "ANY",
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_ => return Cow::Owned(self.generic_name()),
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_ => return None,
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})
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}
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/// uses generic name for QCLASS values (`is_qclass`)
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pub fn class_name(self) -> Cow<'static, str> {
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if self.is_qclass() {
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Cow::Owned(self.generic_name())
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} else {
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self.name()
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}
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}
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/// QCLASS names can overlap with (Q)TYPE names
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/// name for CLASS
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///
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/// classes unknown to this implementation never count as QCLASS,
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/// but they also are only represented using the generic "CLASS..."
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/// names, which don't overlap with (Q)TYPE names.
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pub fn is_qclass(self) -> bool {
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match self {
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NONE => true,
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ANY => true,
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_ => false,
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/// Known CLASSes are represented using their known mnemonic, others
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/// using the "CLASS..." syntax (RFC 3597).
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pub fn name(self) -> Cow<'static, str> {
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match self.known_name() {
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Some(n) => Cow::Borrowed(n),
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None => Cow::Owned(self.generic_name()),
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}
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}
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pub fn from_name(name: &str) -> Option<Self> {
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use std::ascii::AsciiExt;
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if let Some(n) = Self::class_from_name(name) { return Some(n); }
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// explicit QCLASS names
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if name.eq_ignore_ascii_case("NONE") { return Some(NONE); }
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if name.eq_ignore_ascii_case("ANY") { return Some(ANY); }
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None
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/// similar to `name`, but returns "CLASS255" for the `ANY` class
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pub fn name_without_any(self) -> Cow<'static, str> {
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match self {
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ANY => Cow::Borrowed("CLASS255"),
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_ => self.name(),
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}
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}
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/// similar to `from_name`, but doesn't accept QCLASS names (it
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/// always accepts "CLASS..." names though, even if they are known to
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/// be of type QCLASS)
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pub fn class_from_name(name: &str) -> Option<Self> {
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/// generic name "CLASS..."
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pub fn generic_name(self) -> String {
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let mut result = String::new();
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self.write_generic_name(&mut result).unwrap();
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result
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}
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/// directly write generic name "CLASS..." to some target
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pub fn write_generic_name<W: fmt::Write>(self, w: &mut W) -> fmt::Result {
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write!(w, "CLASS{}", self.0)
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}
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/// only parse known names (mnemonics), but not `ANY`
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///
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/// Avoids conflict with parsing RRTYPE mnemonics.
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pub fn from_known_name_without_any(name: &str) -> Option<Self> {
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use std::ascii::AsciiExt;
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if name.eq_ignore_ascii_case("IN") { return Some(IN); }
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if name.eq_ignore_ascii_case("CH") { return Some(CH); }
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if name.eq_ignore_ascii_case("HS") { return Some(HS); }
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if name.as_bytes()[0..5].eq_ignore_ascii_case(b"CLASS") {
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if let Ok(c) = name[5..].parse::<u16>() {
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return Some(Class(c))
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}
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}
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if name.eq_ignore_ascii_case("NONE") { return Some(NONE); }
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None
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}
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pub fn write_class_name(self, f: &mut fmt::Formatter) -> fmt::Result {
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if self.is_qclass() {
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self.write_generic_name(f)
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/// parses known names (mnemonics)
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pub fn from_known_name(name: &str) -> Option<Self> {
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use std::ascii::AsciiExt;
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Self::from_known_name_without_any(name).or_else(|| {
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if name.eq_ignore_ascii_case("ANY") { return Some(ANY); }
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None
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})
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}
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/// parses generic names of the form "CLASS..."
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pub fn from_generic_name(name: &str) -> Option<Self> {
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use std::ascii::AsciiExt;
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if name.as_bytes()[0..5].eq_ignore_ascii_case(b"CLASS") {
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name[5..].parse::<u16>().ok().map(Class)
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} else {
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write!(f, "{}", self)
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None
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}
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}
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pub fn write_generic_name(self, f: &mut fmt::Formatter) -> fmt::Result {
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write!(f, "CLASS{}", self.0)
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/// parses any name (mnemonics and "CLASS..."), but not `ANY`
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/// ("CLASS255" works though)
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pub fn from_name_without_any(name: &str) -> Option<Self> {
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Self::from_generic_name(name).or_else(|| {
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Self::from_known_name_without_any(name)
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})
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}
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pub fn generic_name(self) -> String {
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format!("CLASS{}", self.0)
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/// parses any name (mnemonics and "CLASS...")
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pub fn from_name(name: &str) -> Option<Self> {
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Self::from_generic_name(name).or_else(|| {
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Self::from_known_name(name)
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})
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}
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}
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impl fmt::Display for Class {
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fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
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let n = match *self {
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IN => "IN",
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CH => "CH",
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HS => "HS",
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NONE => "NONE",
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ANY => "ANY",
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_ => {
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return self.write_generic_name(f)
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},
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};
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write!(f, "{}", n)
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match self.known_name() {
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Some(n) => write!(f, "{}", n),
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None => self.write_generic_name(f),
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}
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}
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}
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@ -148,7 +206,7 @@ impl DnsPacketData for Class {
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impl DnsTextData for Class {
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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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Class::from_name(field).ok_or_else(|| format_err!("unknown class {:?}", field))
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Class::from_name(field).ok_or_else(|| format_err!("unknown CLASS {:?}", field))
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}
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fn dns_format(&self, f: &mut DnsTextFormatter) -> fmt::Result {
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use std::fmt;
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use std::io::Cursor;
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/// A single quoted non-empty URL.
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/// timestamp in seconds since epoch (ignoring leap seconds)
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///
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/// Actually shouldn't allow escapes (i.e. no backslash in the content);
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/// but to make sure we can export and import any data we allow standard
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/// escape mechanisms and even accept unquoted input.
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///
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/// No whitespace allowed, last field.
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/// Is expected to wrap around.
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#[derive(Clone, PartialEq, Eq, Debug)]
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pub struct Time(u32);
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//! Types and constants for DNS TYPes
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use bytes::Bytes;
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use errors::*;
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use records::registry::{lookup_type_to_name, lookup_type_name};
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@ -7,305 +9,504 @@ use std::borrow::Cow;
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use std::fmt;
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use std::io::Cursor;
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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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/// a host address
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pub const A : Type = Type(KnownType::A as u16);
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/// an authoritative name server
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pub const NS : Type = Type(KnownType::NS as u16);
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/// a mail destination (OBSOLETE - use MX)
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pub const MD : Type = Type(KnownType::MD as u16);
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/// a mail forwarder (OBSOLETE - use MX)
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pub const MF : Type = Type(KnownType::MF as u16);
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/// the canonical name for an alias
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pub const CNAME : Type = Type(KnownType::CNAME as u16);
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/// marks the start of a zone of authority
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pub const SOA : Type = Type(KnownType::SOA as u16);
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/// a mailbox domain name (EXPERIMENTAL)
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pub const MB : Type = Type(KnownType::MB as u16);
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/// a mail group member (EXPERIMENTAL)
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pub const MG : Type = Type(KnownType::MG as u16);
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/// a mail rename domain name (EXPERIMENTAL)
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pub const MR : Type = Type(KnownType::MR as u16);
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/// a null RR (EXPERIMENTAL)
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pub const NULL : Type = Type(KnownType::NULL as u16);
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/// a well known service description
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pub const WKS : Type = Type(KnownType::WKS as u16);
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/// a domain name pointer
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pub const PTR : Type = Type(KnownType::PTR as u16);
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/// host information
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pub const HINFO : Type = Type(KnownType::HINFO as u16);
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/// mailbox or mail list information
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pub const MINFO : Type = Type(KnownType::MINFO as u16);
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/// mail exchange
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pub const MX : Type = Type(KnownType::MX as u16);
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/// text strings
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pub const TXT : Type = Type(KnownType::TXT as u16);
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/// for Responsible Person
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pub const RP : Type = Type(KnownType::RP as u16);
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/// for AFS Data Base location
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pub const AFSDB : Type = Type(KnownType::AFSDB as u16);
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/// for X.25 PSDN address
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pub const X25 : Type = Type(KnownType::X25 as u16);
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/// for ISDN address
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pub const ISDN : Type = Type(KnownType::ISDN as u16);
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/// for Route Through
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pub const RT : Type = Type(KnownType::RT as u16);
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/// for NSAP address, NSAP style A record
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pub const NSAP : Type = Type(KnownType::NSAP as u16);
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/// for domain name pointer, NSAP style
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pub const NSAP_PTR : Type = Type(KnownType::NSAP_PTR as u16);
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/// for security signature
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pub const SIG : Type = Type(KnownType::SIG as u16);
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/// for security key
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pub const KEY : Type = Type(KnownType::KEY as u16);
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/// X.400 mail mapping information
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pub const PX : Type = Type(KnownType::PX as u16);
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/// Geographical Position
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pub const GPOS : Type = Type(KnownType::GPOS as u16);
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/// IP6 Address
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pub const AAAA : Type = Type(KnownType::AAAA as u16);
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/// Location Information
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pub const LOC : Type = Type(KnownType::LOC as u16);
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/// Next Domain (OBSOLETE)
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pub const NXT : Type = Type(KnownType::NXT as u16);
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/// Endpoint Identifier
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pub const EID : Type = Type(KnownType::EID as u16);
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/// Nimrod Locator
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pub const NIMLOC : Type = Type(KnownType::NIMLOC as u16);
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/// Server Selection
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pub const SRV : Type = Type(KnownType::SRV as u16);
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/// ATM Address
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pub const ATMA : Type = Type(KnownType::ATMA as u16);
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/// Naming Authority Pointer
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pub const NAPTR : Type = Type(KnownType::NAPTR as u16);
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/// Key Exchanger
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pub const KX : Type = Type(KnownType::KX as u16);
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/// CERT
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pub const CERT : Type = Type(KnownType::CERT as u16);
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/// A6 (OBSOLETE - use AAAA)
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pub const A6 : Type = Type(KnownType::A6 as u16);
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/// DNAME
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pub const DNAME : Type = Type(KnownType::DNAME as u16);
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/// SINK
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pub const SINK : Type = Type(KnownType::SINK as u16);
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/// OPT
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pub const OPT : Type = Type(KnownMetaType::OPT as u16);
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/// APL
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pub const APL : Type = Type(KnownType::APL as u16);
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/// Delegation Signer
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pub const DS : Type = Type(KnownType::DS as u16);
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/// SSH Key Fingerprint
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pub const SSHFP : Type = Type(KnownType::SSHFP as u16);
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/// IPSECKEY
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pub const IPSECKEY : Type = Type(KnownType::IPSECKEY as u16);
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/// RRSIG
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pub const RRSIG : Type = Type(KnownType::RRSIG as u16);
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/// NSEC
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pub const NSEC : Type = Type(KnownType::NSEC as u16);
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/// DNSKEY
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pub const DNSKEY : Type = Type(KnownType::DNSKEY as u16);
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/// DHCID
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pub const DHCID : Type = Type(KnownType::DHCID as u16);
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/// NSEC3
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pub const NSEC3 : Type = Type(KnownType::NSEC3 as u16);
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/// NSEC3PARAM
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pub const NSEC3PARAM : Type = Type(KnownType::NSEC3PARAM as u16);
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/// TLSA
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pub const TLSA : Type = Type(KnownType::TLSA as u16);
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/// S/MIME cert association
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pub const SMIMEA : Type = Type(KnownType::SMIMEA as u16);
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/// Host Identity Protocol
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pub const HIP : Type = Type(KnownType::HIP as u16);
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/// NINFO
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pub const NINFO : Type = Type(KnownType::NINFO as u16);
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/// RKEY
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pub const RKEY : Type = Type(KnownType::RKEY as u16);
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/// Trust Anchor LINK
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pub const TALINK : Type = Type(KnownType::TALINK as u16);
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/// Child DS
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pub const CDS : Type = Type(KnownType::CDS as u16);
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/// DNSKEY(s) the Child wants reflected in DS
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pub const CDNSKEY : Type = Type(KnownType::CDNSKEY as u16);
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/// OpenPGP Key
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pub const OPENPGPKEY : Type = Type(KnownType::OPENPGPKEY as u16);
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/// Child-To-Parent Synchronization
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pub const CSYNC : Type = Type(KnownType::CSYNC as u16);
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/// SPF
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pub const SPF : Type = Type(KnownType::SPF as u16);
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/// UINFO
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pub const UINFO : Type = Type(KnownType::UINFO as u16);
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/// UID
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pub const UID : Type = Type(KnownType::UID as u16);
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/// GID
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pub const GID : Type = Type(KnownType::GID as u16);
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/// UNSPEC
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pub const UNSPEC : Type = Type(KnownType::UNSPEC as u16);
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/// NID
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pub const NID : Type = Type(KnownType::NID as u16);
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/// L32
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pub const L32 : Type = Type(KnownType::L32 as u16);
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/// L64
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pub const L64 : Type = Type(KnownType::L64 as u16);
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/// LP
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pub const LP : Type = Type(KnownType::LP as u16);
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/// an EUI-48 address
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pub const EUI48 : Type = Type(KnownType::EUI48 as u16);
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/// an EUI-64 address
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pub const EUI64 : Type = Type(KnownType::EUI64 as u16);
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/// Transaction Key
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pub const TKEY : Type = Type(KnownMetaType::TKEY as u16);
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/// Transaction Signature
|
||||
pub const TSIG : Type = Type(KnownMetaType::TSIG as u16);
|
||||
/// incremental transfer
|
||||
pub const IXFR : Type = Type(KnownQType::IXFR as u16);
|
||||
/// transfer of an entire zone
|
||||
pub const AXFR : Type = Type(KnownQType::AXFR as u16);
|
||||
/// mailbox-related RRs (MB, MG or MR)
|
||||
pub const MAILB : Type = Type(KnownQType::MAILB as u16);
|
||||
/// mail agent RRs (OBSOLETE - see MX)
|
||||
pub const MAILA : Type = Type(KnownQType::MAILA as u16);
|
||||
/// "*", a request for all records the server/cache has available
|
||||
pub const ANY : Type = Type(KnownQType::ANY as u16);
|
||||
/// URI
|
||||
pub const URI : Type = Type(KnownType::URI as u16);
|
||||
/// Certification Authority Restriction
|
||||
pub const CAA : Type = Type(KnownType::CAA as u16);
|
||||
/// Application Visibility and Control
|
||||
pub const AVC : Type = Type(KnownType::AVC as u16);
|
||||
/// Digital Object Architecture
|
||||
pub const DOA : Type = Type(KnownType::DOA as u16);
|
||||
/// DNSSEC Trust Authorities
|
||||
pub const TA : Type = Type(KnownType::TA as u16);
|
||||
/// DNSSEC Lookaside Validation
|
||||
pub const DLV : Type = Type(KnownType::DLV as u16);
|
||||
/// powerdns feature: authoritate should resolve to A and AAAA
|
||||
pub const ALIAS : Type = Type(KnownType::ALIAS as u16);
|
||||
|
||||
/// known data TYPEs
|
||||
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
|
||||
#[repr(u16)]
|
||||
#[allow(non_camel_case_types)]
|
||||
pub enum KnownType {
|
||||
// try to list "original" rfc
|
||||
/// a host address
|
||||
A = 0x0001, // RFC 1035
|
||||
/// an authoritative name server
|
||||
NS = 0x0002, // RFC 1035
|
||||
/// a mail destination (OBSOLETE - use MX)
|
||||
MD = 0x0003, // RFC 1035
|
||||
/// a mail forwarder (OBSOLETE - use MX)
|
||||
MF = 0x0004, // RFC 1035
|
||||
/// the canonical name for an alias
|
||||
CNAME = 0x0005, // RFC 1035
|
||||
/// marks the start of a zone of authority
|
||||
SOA = 0x0006, // RFC 1035
|
||||
/// a mailbox domain name (EXPERIMENTAL)
|
||||
MB = 0x0007, // RFC 1035
|
||||
/// a mail group member (EXPERIMENTAL)
|
||||
MG = 0x0008, // RFC 1035
|
||||
/// a mail rename domain name (EXPERIMENTAL)
|
||||
MR = 0x0009, // RFC 1035
|
||||
/// a null RR (EXPERIMENTAL)
|
||||
NULL = 0x000a, // RFC 1035
|
||||
/// a well known service description
|
||||
WKS = 0x000b, // RFC 1035
|
||||
/// a domain name pointer
|
||||
PTR = 0x000c, // RFC 1035
|
||||
/// host information
|
||||
HINFO = 0x000d, // RFC 1035
|
||||
/// mailbox or mail list information
|
||||
MINFO = 0x000e, // RFC 1035
|
||||
/// mail exchange
|
||||
MX = 0x000f, // RFC 1035
|
||||
/// text strings
|
||||
TXT = 0x0010, // RFC 1035
|
||||
/// for Responsible Person
|
||||
RP = 0x0011, // RFC 1183
|
||||
/// for AFS Data Base location
|
||||
AFSDB = 0x0012, // RFC 1183
|
||||
/// for X.25 PSDN address
|
||||
X25 = 0x0013, // RFC 1183
|
||||
/// for ISDN address
|
||||
ISDN = 0x0014, // RFC 1183
|
||||
/// for Route Through
|
||||
RT = 0x0015, // RFC 1183
|
||||
/// for NSAP address, NSAP style A record
|
||||
NSAP = 0x0016, // RFC 1706
|
||||
/// for domain name pointer, NSAP style
|
||||
NSAP_PTR = 0x0017, // RFC 1348
|
||||
/// for security signature
|
||||
SIG = 0x0018, // RFC 2535
|
||||
/// for security key
|
||||
KEY = 0x0019, // RFC 2535
|
||||
/// X.400 mail mapping information
|
||||
PX = 0x001a, // RFC 2163
|
||||
/// Geographical Position
|
||||
GPOS = 0x001b, // RFC 1712
|
||||
/// IP6 Address
|
||||
AAAA = 0x001c, // RFC 3596
|
||||
/// Location Information
|
||||
LOC = 0x001d, // RFC 1876
|
||||
/// Next Domain (OBSOLETE)
|
||||
NXT = 0x001e, // RFC 2535
|
||||
/// Endpoint Identifier
|
||||
EID = 0x001f, // Michael Patton: http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt
|
||||
/// Nimrod Locator
|
||||
NIMLOC = 0x0020, // Michael Patton: http://ana-3.lcs.mit.edu/~jnc/nimrod/dns.txt
|
||||
/// Server Selection
|
||||
SRV = 0x0021, // RFC 2782
|
||||
/// ATM Address
|
||||
ATMA = 0x0022, // http://www.broadband-forum.org/ftp/pub/approved-specs/af-dans-0152.000.pdf
|
||||
/// Naming Authority Pointer
|
||||
NAPTR = 0x0023, // RFC 2168
|
||||
/// Key Exchanger
|
||||
KX = 0x0024, // RFC 2230
|
||||
/// CERT
|
||||
CERT = 0x0025, // RFC 4398
|
||||
/// A6 (OBSOLETE - use AAAA)
|
||||
A6 = 0x0026, // RFC 2874
|
||||
/// DNAME
|
||||
DNAME = 0x0027, // RFC 6672
|
||||
/// SINK
|
||||
SINK = 0x0028, // Donald E Eastlake: http://tools.ietf.org/html/draft-eastlake-kitchen-sink
|
||||
// OPT (0x0029) is a meta type
|
||||
/// APL
|
||||
APL = 0x002a, // RFC 3123
|
||||
/// Delegation Signer
|
||||
DS = 0x002b, // RFC 3658
|
||||
/// SSH Key Fingerprint
|
||||
SSHFP = 0x002c, // RFC 4255
|
||||
/// IPSECKEY
|
||||
IPSECKEY = 0x002d, // RFC 4025
|
||||
/// RRSIG
|
||||
RRSIG = 0x002e, // RFC 4034
|
||||
/// NSEC
|
||||
NSEC = 0x002f, // RFC 4034
|
||||
/// DNSKEY
|
||||
DNSKEY = 0x0030, // RFC 4034
|
||||
/// DHCID
|
||||
DHCID = 0x0031, // RFC 4701
|
||||
/// NSEC3
|
||||
NSEC3 = 0x0032, // RFC 5155
|
||||
/// NSEC3PARAM
|
||||
NSEC3PARAM = 0x0033, // RFC 5155
|
||||
/// TLSA
|
||||
TLSA = 0x0034, // RFC 6698
|
||||
/// S/MIME cert association
|
||||
SMIMEA = 0x0035, // RFC 8162
|
||||
/// Host Identity Protocol
|
||||
HIP = 0x0037, // RFC 8005
|
||||
/// NINFO
|
||||
NINFO = 0x0038, // Jim Reid
|
||||
/// RKEY
|
||||
RKEY = 0x0039, // Jim Reid
|
||||
/// Trust Anchor LINK
|
||||
TALINK = 0x003a, // Wouter Wijngaards
|
||||
/// Child DS
|
||||
CDS = 0x003b, // RFC 7344
|
||||
/// DNSKEY(s) the Child wants reflected in DS
|
||||
CDNSKEY = 0x003c, // RFC 7344
|
||||
/// OpenPGP Key
|
||||
OPENPGPKEY = 0x003d, // RFC 7929
|
||||
/// Child-To-Parent Synchronization
|
||||
CSYNC = 0x003e, // RFC 7477
|
||||
/// SPF
|
||||
SPF = 0x0063, // RFC 7208
|
||||
/// UINFO
|
||||
UINFO = 0x0064, // IANA-Reserved
|
||||
/// UID
|
||||
UID = 0x0065, // IANA-Reserved
|
||||
/// GID
|
||||
GID = 0x0066, // IANA-Reserved
|
||||
/// UNSPEC
|
||||
UNSPEC = 0x0067, // IANA-Reserved
|
||||
/// NID
|
||||
NID = 0x0068, // RFC 6742
|
||||
/// L32
|
||||
L32 = 0x0069, // RFC 6742
|
||||
/// L64
|
||||
L64 = 0x006a, // RFC 6742
|
||||
/// LP
|
||||
LP = 0x006b, // RFC 6742
|
||||
/// an EUI-48 address
|
||||
EUI48 = 0x006c, // RFC 7043
|
||||
/// an EUI-64 address
|
||||
EUI64 = 0x006d, // RFC 7043
|
||||
// 0x0080..0x00ff: meta and qtypes
|
||||
/// URI
|
||||
URI = 0x0100, // RFC 7553
|
||||
/// Certification Authority Restriction
|
||||
CAA = 0x0101, // RFC 6844
|
||||
/// Application Visibility and Control
|
||||
AVC = 0x0102, // Wolfgang Riedel
|
||||
/// Digital Object Architecture
|
||||
DOA = 0x0103, // http://www.iana.org/go/draft-durand-doa-over-dns
|
||||
/// DNSSEC Trust Authorities
|
||||
TA = 0x8000, //
|
||||
/// DNSSEC Lookaside Validation
|
||||
DLV = 0x8001, // RFC 4431
|
||||
/// powerdns feature: authoritate should resolve to A and AAAA
|
||||
ALIAS = 0xff79, // powerdns
|
||||
}
|
||||
|
||||
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
|
||||
#[repr(u16)]
|
||||
#[allow(non_camel_case_types)]
|
||||
pub enum KnownMetaType {
|
||||
OPT = 0x0029, // RFC 6891
|
||||
TKEY = 0x00f9, // RFC 2930
|
||||
TSIG = 0x00fa, // RFC 2845
|
||||
}
|
||||
|
||||
/// known QTYPEs
|
||||
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
|
||||
#[repr(u16)]
|
||||
#[allow(non_camel_case_types)]
|
||||
pub enum KnownQType {
|
||||
/// incremental transfer
|
||||
IXFR = 0x00fb, // RFC 1995
|
||||
/// transfer of an entire zone
|
||||
AXFR = 0x00fc, // RFC 1035
|
||||
/// mailbox-related RRs (MB, MG or MR)
|
||||
MAILB = 0x00fd, // RFC 1035
|
||||
/// mail agent RRs (OBSOLETE - see MX)
|
||||
MAILA = 0x00fe, // RFC 1035
|
||||
ANY = 0x00ff, // RFC 1035, "*"
|
||||
/// "*", a request for all records the server/cache has available
|
||||
ANY = 0x00ff, // RFC 1035
|
||||
}
|
||||
|
||||
impl Type {
|
||||
pub fn name(self) -> Cow<'static, str> {
|
||||
if let Some(name) = lookup_type_to_name(self) {
|
||||
Cow::Borrowed(name)
|
||||
} else {
|
||||
Cow::Owned(self.generic_name())
|
||||
}
|
||||
}
|
||||
/// known Meta-TYPEs
|
||||
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
|
||||
#[repr(u16)]
|
||||
#[allow(non_camel_case_types)]
|
||||
pub enum KnownMetaType {
|
||||
/// OPT
|
||||
OPT = 0x0029, // RFC 6891
|
||||
/// Transaction Key
|
||||
TKEY = 0x00f9, // RFC 2930
|
||||
/// Transaction Signature
|
||||
TSIG = 0x00fa, // RFC 2845
|
||||
}
|
||||
|
||||
// 0x0080-0x00FF is reserved for QTYPEs and Meta TYPEs.
|
||||
// OPT is a special meta type
|
||||
/// DNS (RR)TYPE
|
||||
///
|
||||
/// Originally QTYPE was a superset of TYPE; RFC 6895 now defines:
|
||||
///
|
||||
/// > There are three subcategories of RRTYPE numbers: data TYPEs,
|
||||
/// > QTYPEs, and Meta-TYPEs.
|
||||
///
|
||||
/// ## `ANY`
|
||||
///
|
||||
/// QTYPE 255 ("*") doesn't seem to have an official mnemonic; `ANY` is
|
||||
/// used in most tools though.
|
||||
///
|
||||
/// The `ANY` mnemonic conflicts with the QCLASS `ANY` though; the name
|
||||
/// functions for `Class` have `_without_any` variants though.
|
||||
#[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug)]
|
||||
pub struct Type(pub u16);
|
||||
|
||||
impl Type {
|
||||
/// whether TYPE is known or reserved to be a QTYPE or a Meta-TYPE.
|
||||
///
|
||||
/// 0x0080-0x00FF is reserved for QTYPEs and Meta-TYPEs; OPT is a
|
||||
/// special Meta-TYPE.
|
||||
pub fn is_q_or_meta_type(self) -> bool {
|
||||
self == OPT || (self.0 >= 128 && self.0 < 256)
|
||||
}
|
||||
|
||||
// checks for known qtypes
|
||||
/// map to `KnownQType`
|
||||
pub fn known_qtype(self) -> Option<KnownQType> {
|
||||
Some(match self {
|
||||
IXFR => KnownQType::IXFR,
|
||||
AXFR => KnownQType::AXFR,
|
||||
MAILB => KnownQType::MAILB,
|
||||
MAILA => KnownQType::MAILA,
|
||||
ANY => KnownQType::ANY,
|
||||
_ => return None,
|
||||
})
|
||||
}
|
||||
|
||||
/// whether TYPE is known to be a QTYPE
|
||||
pub fn is_known_qtype(self) -> bool {
|
||||
match self {
|
||||
IXFR => true,
|
||||
AXFR => true,
|
||||
MAILB => true,
|
||||
MAILA => true,
|
||||
ANY => true,
|
||||
_ => false,
|
||||
}
|
||||
self.known_qtype().is_some()
|
||||
}
|
||||
|
||||
// checks for known meta types
|
||||
/// map to `KnownMetaType`
|
||||
pub fn known_meta_type(self) -> Option<KnownMetaType> {
|
||||
Some(match self {
|
||||
OPT => KnownMetaType::OPT,
|
||||
TKEY => KnownMetaType::TKEY,
|
||||
TSIG => KnownMetaType::TSIG,
|
||||
_ => return None,
|
||||
})
|
||||
}
|
||||
|
||||
/// whether TYPE is known to be a Meta-TYPE
|
||||
pub fn is_known_meta_type(self) -> bool {
|
||||
match self {
|
||||
OPT => true,
|
||||
TKEY => true,
|
||||
TSIG => true,
|
||||
_ => false,
|
||||
}
|
||||
}
|
||||
|
||||
/// uses generic name for QTYPEs/Meta TYPEs (`is_q_or_meta_type`)
|
||||
pub fn type_name(self) -> Cow<'static, str> {
|
||||
if self.is_q_or_meta_type() {
|
||||
Cow::Owned(self.generic_name())
|
||||
} else {
|
||||
self.name()
|
||||
self.known_meta_type().is_some()
|
||||
}
|
||||
|
||||
/// name for TYPE if known
|
||||
///
|
||||
/// Known TYPEs are represented using their known mnemonic, others
|
||||
/// return None.
|
||||
pub fn known_name(self) -> Option<&'static str> {
|
||||
lookup_type_to_name(self)
|
||||
}
|
||||
|
||||
/// name for TYPE
|
||||
///
|
||||
/// Known TYPEes are represented using their known mnemonic, others
|
||||
/// using the "TYPE..." syntax (RFC 3597).
|
||||
pub fn name(self) -> Cow<'static, str> {
|
||||
match self.known_name() {
|
||||
Some(name) => Cow::Borrowed(name),
|
||||
None => Cow::Owned(self.generic_name())
|
||||
}
|
||||
}
|
||||
|
||||
/// generic name "TYPE..."
|
||||
pub fn generic_name(self) -> String {
|
||||
format!("TYPE{}", self.0)
|
||||
let mut result = String::new();
|
||||
self.write_generic_name(&mut result).unwrap();
|
||||
result
|
||||
}
|
||||
|
||||
pub fn from_name(name: &str) -> Option<Self> {
|
||||
/// directly write generic name "TYPE..." to some target
|
||||
pub fn write_generic_name<W: fmt::Write>(self, w: &mut W) -> fmt::Result {
|
||||
write!(w, "TYPE{}", self.0)
|
||||
}
|
||||
|
||||
/// parses known names (mnemonics)
|
||||
pub fn from_known_name(name: &str) -> Option<Self> {
|
||||
lookup_type_name(name)
|
||||
}
|
||||
|
||||
/// parses generic names of the form "TYPE..."
|
||||
pub fn from_generic_name(name: &str) -> Option<Self> {
|
||||
use std::ascii::AsciiExt;
|
||||
if let Some(t) = lookup_type_name(name) { return Some(t); }
|
||||
if name.as_bytes()[0..4].eq_ignore_ascii_case(b"TYPE") {
|
||||
if let Ok(t) = name[4..].parse::<u16>() {
|
||||
return Some(Type(t));
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
|
||||
/// similar to `from_name`, but doesn't accept QTYPE/Meta TYPE names (it
|
||||
/// always accepts "TYPE..." names though, even if they are known to
|
||||
/// be QTYPE/Meta TYPE)
|
||||
pub fn type_from_name(name: &str) -> Option<Self> {
|
||||
use std::ascii::AsciiExt;
|
||||
if let Some(t) = lookup_type_name(name) {
|
||||
if t.is_q_or_meta_type() { return None; }
|
||||
return Some(t);
|
||||
}
|
||||
if name.as_bytes()[0..4].eq_ignore_ascii_case(b"TYPE") {
|
||||
if let Ok(t) = name[4..].parse::<u16>() {
|
||||
return Some(Type(t));
|
||||
}
|
||||
}
|
||||
None
|
||||
}
|
||||
|
||||
pub fn write_type_name(self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
if self.is_q_or_meta_type() {
|
||||
self.write_generic_name(f)
|
||||
name[4..].parse::<u16>().ok().map(Type)
|
||||
} else {
|
||||
write!(f, "{}", self)
|
||||
None
|
||||
}
|
||||
}
|
||||
|
||||
pub fn write_generic_name(self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
write!(f, "TYPE{}", self.0)
|
||||
/// parses any name (mnemonics and "TYPE...")
|
||||
pub fn from_name(name: &str) -> Option<Self> {
|
||||
Self::from_generic_name(name).or_else(|| {
|
||||
Self::from_known_name(name)
|
||||
})
|
||||
}
|
||||
|
||||
/// defined in RFC 1035
|
||||
pub fn well_known(self) -> bool {
|
||||
/// whether TYPE is defined in RFC 1035
|
||||
pub fn is_well_known(self) -> bool {
|
||||
// 0x0001 (A) ... 0x0010 (TXT) are defined in RFC 1035
|
||||
self.0 >= 0x0001 && self.0 <= 0x0010
|
||||
}
|
||||
|
||||
/// require converting to canonical form for DNSSEC (i.e. names
|
||||
/// must be converted to (ASCII) lower case, no compression)
|
||||
/// require converting to canonical form for DNSSEC (i.e. names must
|
||||
/// be converted to (ASCII) lower case).
|
||||
///
|
||||
/// See https://tools.ietf.org/html/rfc4034#section-6.2 (updates RFC 3597).
|
||||
/// Also updated by https://tools.ietf.org/html/rfc6840#section-5.1
|
||||
pub fn canonical(self) -> bool {
|
||||
/// For DNSSEC name compression is forbidden too; all compressable
|
||||
/// TYPEs are included in the list anyway.
|
||||
///
|
||||
/// See [RFC 4034 section 6.2][1] (obsoletes RFC 3597). Also
|
||||
/// updated by [RFC 6840 section 5.1][2].
|
||||
///
|
||||
/// [1]: https://tools.ietf.org/html/rfc4034#section-6.2
|
||||
/// [2]: https://tools.ietf.org/html/rfc6840#section-5.1
|
||||
pub fn use_canonical_names(self) -> bool {
|
||||
match self {
|
||||
NS => true,
|
||||
MD => true,
|
||||
@ -347,24 +548,23 @@ impl From<KnownType> for Type {
|
||||
}
|
||||
}
|
||||
|
||||
impl From<KnownMetaType> for Type {
|
||||
fn from(value: KnownMetaType) -> Self {
|
||||
Type(value as u16)
|
||||
}
|
||||
}
|
||||
|
||||
impl From<KnownQType> for Type {
|
||||
fn from(value: KnownQType) -> Self {
|
||||
Type(value as u16)
|
||||
}
|
||||
}
|
||||
|
||||
impl From<KnownMetaType> for Type {
|
||||
fn from(value: KnownMetaType) -> Self {
|
||||
Type(value as u16)
|
||||
}
|
||||
}
|
||||
|
||||
impl fmt::Display for Type {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
if let Some(name) = lookup_type_to_name(*self) {
|
||||
write!(f, "{}", name)
|
||||
} else {
|
||||
self.write_generic_name(f)
|
||||
match self.known_name() {
|
||||
Some(name) => write!(f, "{}", name),
|
||||
None => self.write_generic_name(f),
|
||||
}
|
||||
}
|
||||
}
|
||||
@ -378,7 +578,7 @@ impl DnsPacketData for Type {
|
||||
impl DnsTextData for Type {
|
||||
fn dns_parse(data: &mut &str) -> Result<Self> {
|
||||
let field = next_field(data)?;
|
||||
Type::from_name(field).ok_or_else(|| format_err!("unknown type {:?}", field))
|
||||
Type::from_name(field).ok_or_else(|| format_err!("unknown TYPE {:?}", field))
|
||||
}
|
||||
|
||||
fn dns_format(&self, f: &mut DnsTextFormatter) -> fmt::Result {
|
||||
@ -386,7 +586,6 @@ impl DnsTextData for Type {
|
||||
}
|
||||
}
|
||||
|
||||
|
||||
#[cfg(test)]
|
||||
macro_rules! check_type {
|
||||
($t:ident, $dec:expr) => {
|
||||
@ -409,6 +608,10 @@ macro_rules! check_type {
|
||||
};
|
||||
}
|
||||
|
||||
// the IANA registry uses decimal numbers; make sure there were no typos
|
||||
// when converting them to hex in the constants above.
|
||||
//
|
||||
// also checks the registry has the name-to-number mapping.
|
||||
#[cfg(test)]
|
||||
#[test]
|
||||
fn check_types() {
|
||||
|
@ -16,12 +16,23 @@ where
|
||||
Ok(result)
|
||||
}
|
||||
|
||||
fn rrdata_parse<T>(data: &str) -> ::errors::Result<T>
|
||||
where
|
||||
T: StaticRRData
|
||||
{
|
||||
let mut data = data;
|
||||
let result = T::dns_parse_rr_data(3600, classes::IN, T::TYPE, &mut data)?;
|
||||
let data = data.trim();
|
||||
ensure!(data.is_empty(), "didn't parse complete rrdata text, remaining: {:?}", data);
|
||||
Ok(result)
|
||||
}
|
||||
|
||||
fn check<T>(txt: &str, data: &'static [u8]) -> ::errors::Result<()>
|
||||
where
|
||||
T: StaticRRData + fmt::Debug + PartialEq
|
||||
{
|
||||
let d1: T = rrdata_de(data).context("couldn't parse binary record")?;
|
||||
let d2: T = text::parse(txt).context("couldn't parse text record")?;
|
||||
let d2: T = rrdata_parse(txt).context("couldn't parse text record")?;
|
||||
ensure!(d1 == d2, "decoded data not equal: {:?} != {:?}", d1, d2);
|
||||
Ok(())
|
||||
}
|
||||
@ -31,9 +42,9 @@ where
|
||||
T: StaticRRData + fmt::Debug + PartialEq
|
||||
{
|
||||
let d1: T = rrdata_de(data).context("couldn't parse binary record")?;
|
||||
let d2: T = text::parse(txt).context("couldn't parse text record")?;
|
||||
let d2: T = rrdata_parse(txt).context("couldn't parse text record")?;
|
||||
ensure!(d1 == d2, "decoded data not equal: {:?} != {:?}", d1, d2);
|
||||
|
||||
|
||||
Ok(())
|
||||
}
|
||||
|
||||
@ -61,7 +72,7 @@ where
|
||||
s.push('"');
|
||||
for _ in 0..256 { s.push('a'); }
|
||||
s.push('"');
|
||||
text::parse::<T>(&s).unwrap_err();
|
||||
rrdata_parse::<T>(&s).unwrap_err();
|
||||
}
|
||||
}
|
||||
|
||||
|
@ -52,4 +52,8 @@ impl RRDataPacket for UnknownRecord {
|
||||
fn deserialize_rr_data(_ttl: u32, _rr_class: Class, rr_type: Type, data: &mut Cursor<Bytes>) -> Result<Self> {
|
||||
UnknownRecord::deserialize(rr_type, data)
|
||||
}
|
||||
|
||||
fn rr_type(&self) -> Type {
|
||||
self.rr_type
|
||||
}
|
||||
}
|
||||
|
@ -1,9 +1,9 @@
|
||||
use bytes::Bytes;
|
||||
use common_types::{Class, Type};
|
||||
use common_types::classes;
|
||||
use common_types::{Class, Type, classes};
|
||||
use errors::*;
|
||||
use ser::DnsPacketData;
|
||||
use ser::text::{DnsTextData, DnsTextFormatter};
|
||||
use std::borrow::Cow;
|
||||
use std::fmt;
|
||||
use std::io::Cursor;
|
||||
|
||||
@ -12,19 +12,25 @@ pub trait RRDataPacket {
|
||||
where
|
||||
Self: Sized,
|
||||
;
|
||||
|
||||
fn rr_type(&self) -> Type;
|
||||
}
|
||||
|
||||
impl<T: DnsPacketData + StaticRRData> RRDataPacket for T {
|
||||
fn deserialize_rr_data(_ttl: u32, rr_class: Class, rr_type: Type, data: &mut Cursor<Bytes>) -> Result<Self> {
|
||||
ensure!(rr_type == T::TYPE, "type mismatch");
|
||||
if T::CLASS != classes::ANY {
|
||||
ensure!(rr_class == T::CLASS, "class mismatch");
|
||||
ensure!(rr_class == T::CLASS, "class mismatch: got {}, need {}", rr_class, T::CLASS);
|
||||
}
|
||||
T::deserialize(data)
|
||||
}
|
||||
|
||||
fn rr_type(&self) -> Type {
|
||||
T::TYPE
|
||||
}
|
||||
}
|
||||
|
||||
pub trait RRDataText: Sized {
|
||||
pub trait RRDataText {
|
||||
fn dns_parse_rr_data(ttl: u32, rr_class: Class, rr_type: Type, data: &mut &str) -> Result<Self>
|
||||
where
|
||||
Self: Sized,
|
||||
@ -32,18 +38,53 @@ pub trait RRDataText: Sized {
|
||||
|
||||
// format might fail if there is no (known) text representation.
|
||||
fn dns_format_rr_data(&self, f: &mut DnsTextFormatter) -> fmt::Result;
|
||||
}
|
||||
|
||||
/*
|
||||
impl<T: DnsTextData> RRDataText for T {
|
||||
fn deserialize_rr_data(_ttl: u32, _rr_class: Class, _rr_type: Type, data: &mut Cursor<Bytes>) -> Result<Self> {
|
||||
T::deserialize(data)
|
||||
fn rr_type_txt(&self) -> Cow<'static, str> {
|
||||
unimplemented!()
|
||||
}
|
||||
|
||||
// (type, rrdata)
|
||||
fn text(&self) -> Result<(String, String)> {
|
||||
use std::fmt::Write;
|
||||
let mut buf = String::new();
|
||||
match write!(&mut buf, "{}", DnsDisplayRR(self)) {
|
||||
Ok(()) => {
|
||||
return Ok((self.rr_type_txt().into(), buf))
|
||||
},
|
||||
Err(_) => (),
|
||||
}
|
||||
buf.clear();
|
||||
unimplemented!()
|
||||
}
|
||||
}
|
||||
*/
|
||||
|
||||
pub trait RRData: RRDataPacket + DnsTextData {
|
||||
fn rr_type(&self) -> Type;
|
||||
impl<T: DnsTextData + StaticRRData> RRDataText for T {
|
||||
fn dns_parse_rr_data(_ttl: u32, rr_class: Class, rr_type: Type, data: &mut &str) -> Result<Self>
|
||||
where
|
||||
Self: Sized,
|
||||
{
|
||||
ensure!(rr_type == T::TYPE, "type mismatch");
|
||||
if T::CLASS != classes::ANY {
|
||||
ensure!(rr_class == T::CLASS, "class mismatch: got {}, need {}", rr_class, T::CLASS);
|
||||
}
|
||||
T::dns_parse(data)
|
||||
}
|
||||
|
||||
fn dns_format_rr_data(&self, f: &mut DnsTextFormatter) -> fmt::Result {
|
||||
self.dns_format(f)
|
||||
}
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct DnsDisplayRR<'a, T: RRDataText + ?Sized + 'a>(pub &'a T);
|
||||
|
||||
impl<'a, T: RRDataText + ?Sized + 'a> fmt::Display for DnsDisplayRR<'a, T> {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
self.0.dns_format_rr_data(&mut DnsTextFormatter::new(f))
|
||||
}
|
||||
}
|
||||
|
||||
pub trait RRData: RRDataPacket + RRDataText {
|
||||
}
|
||||
|
||||
pub trait StaticRRData: RRData {
|
||||
|
@ -53,13 +53,13 @@ pub fn escape(data: &[u8]) -> String {
|
||||
|
||||
/// Each call to write!() makes sure a space is emitted to separate it
|
||||
/// from previous fields.
|
||||
pub struct DnsTextFormatter<'a> {
|
||||
f: &'a mut fmt::Formatter<'a>,
|
||||
pub struct DnsTextFormatter<'a, 'b: 'a> {
|
||||
f: &'a mut fmt::Formatter<'b>,
|
||||
need_space: bool,
|
||||
}
|
||||
|
||||
impl<'a> DnsTextFormatter<'a> {
|
||||
pub fn new(f: &'a mut fmt::Formatter<'a>) -> Self {
|
||||
impl<'a, 'b> DnsTextFormatter<'a, 'b> {
|
||||
pub fn new(f: &'a mut fmt::Formatter<'b>) -> Self {
|
||||
DnsTextFormatter {
|
||||
f: f,
|
||||
need_space: false,
|
||||
@ -82,7 +82,7 @@ impl<'a> DnsTextFormatter<'a> {
|
||||
|
||||
/// direct access to underlying output; you'll need to call
|
||||
/// `next_field` and `end_field` manually.
|
||||
pub fn inner(&mut self) -> &mut fmt::Formatter<'a> {
|
||||
pub fn inner(&mut self) -> &mut fmt::Formatter<'b> {
|
||||
self.f
|
||||
}
|
||||
|
||||
@ -113,3 +113,12 @@ where
|
||||
ensure!(data.is_empty(), "didn't parse complete text, remaining: {:?}", data);
|
||||
Ok(result)
|
||||
}
|
||||
|
||||
#[derive(Debug)]
|
||||
pub struct DnsDisplay<'a, T: DnsTextData + ?Sized + 'a>(pub &'a T);
|
||||
|
||||
impl<'a, T: DnsTextData + ?Sized + 'a> fmt::Display for DnsDisplay<'a, T> {
|
||||
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
|
||||
self.0.dns_format(&mut DnsTextFormatter::new(f))
|
||||
}
|
||||
}
|
||||
|
@ -73,9 +73,6 @@ pub fn build(ast: &syn::DeriveInput) -> quote::Tokens {
|
||||
|
||||
quote!{
|
||||
impl ::dnsbox_base::ser::RRData for #name {
|
||||
fn rr_type(&self) -> ::dnsbox_base::common_types::Type {
|
||||
::dnsbox_base::common_types::types::#name
|
||||
}
|
||||
}
|
||||
|
||||
impl ::dnsbox_base::ser::StaticRRData for #name {
|
||||
|
Loading…
Reference in New Issue
Block a user