1 //! Resource Records are the fundamental type in the DNS - individual records mapping a name to
4 //! This module holds structs and utilities for the Resource Records supported by this crate.
7 use alloc::string::String;
8 use alloc::borrow::ToOwned;
11 use core::cmp::{self, Ordering};
17 /// A valid domain name.
19 /// It must end with a ".", be no longer than 255 bytes, consist of only printable ASCII
20 /// characters and each label may be no longer than 63 bytes.
21 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
22 pub struct Name(String);
24 /// Gets the underlying human-readable domain name
25 pub fn as_str(&self) -> &str { &self.0 }
27 impl core::ops::Deref for Name {
29 fn deref(&self) -> &str { &self.0 }
31 impl fmt::Display for Name {
32 fn fmt(&self, f: &mut fmt::Formatter) -> Result<(), fmt::Error> {
36 impl TryFrom<String> for Name {
38 fn try_from(s: String) -> Result<Name, ()> {
39 if s.is_empty() { return Err(()); }
40 if *s.as_bytes().last().unwrap_or(&0) != b"."[0] { return Err(()); }
41 if s.len() > 255 { return Err(()); }
42 if s.chars().any(|c| !c.is_ascii_graphic() || c == '"') { return Err(()); }
43 for label in s.split(".") {
44 if label.len() > 63 { return Err(()); }
50 impl TryFrom<&str> for Name {
52 fn try_from(s: &str) -> Result<Name, ()> {
53 Self::try_from(s.to_owned())
57 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
58 /// A supported Resource Record
60 /// Note that we only currently support a handful of RR types as needed to generate and validate
61 /// TXT or TLSA record proofs.
63 /// An IPv4 resource record
65 /// An IPv6 resource record
67 /// A name server resource record
69 /// A text resource record
71 /// A TLS Certificate Association resource record
73 /// A Canonical Name record
75 /// A Delegation Name record
77 /// A DNS (Public) Key resource record
79 /// A Delegated Signer resource record
81 /// A Resource Record Signature record
85 /// Gets the name this record refers to.
86 pub fn name(&self) -> &Name {
88 RR::A(rr) => &rr.name,
89 RR::AAAA(rr) => &rr.name,
90 RR::NS(rr) => &rr.name,
91 RR::Txt(rr) => &rr.name,
92 RR::CName(rr) => &rr.name,
93 RR::DName(rr) => &rr.name,
94 RR::TLSA(rr) => &rr.name,
95 RR::DnsKey(rr) => &rr.name,
96 RR::DS(rr) => &rr.name,
97 RR::RRSig(rr) => &rr.name,
100 /// Gets a JSON encoding of this record
101 pub fn json(&self) -> String {
103 RR::A(rr) => StaticRecord::json(rr),
104 RR::AAAA(rr) => StaticRecord::json(rr),
105 RR::NS(rr) => StaticRecord::json(rr),
106 RR::Txt(rr) => StaticRecord::json(rr),
107 RR::CName(rr) => StaticRecord::json(rr),
108 RR::DName(rr) => StaticRecord::json(rr),
109 RR::TLSA(rr) => StaticRecord::json(rr),
110 RR::DnsKey(rr) => StaticRecord::json(rr),
111 RR::DS(rr) => StaticRecord::json(rr),
112 RR::RRSig(rr) => StaticRecord::json(rr),
115 fn ty(&self) -> u16 {
118 RR::AAAA(_) => AAAA::TYPE,
119 RR::NS(_) => NS::TYPE,
120 RR::Txt(_) => Txt::TYPE,
121 RR::CName(_) => CName::TYPE,
122 RR::DName(_) => DName::TYPE,
123 RR::TLSA(_) => TLSA::TYPE,
124 RR::DnsKey(_) => DnsKey::TYPE,
125 RR::DS(_) => DS::TYPE,
126 RR::RRSig(_) => RRSig::TYPE,
129 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
131 RR::A(rr) => StaticRecord::write_u16_len_prefixed_data(rr, out),
132 RR::AAAA(rr) => StaticRecord::write_u16_len_prefixed_data(rr, out),
133 RR::NS(rr) => StaticRecord::write_u16_len_prefixed_data(rr, out),
134 RR::Txt(rr) => StaticRecord::write_u16_len_prefixed_data(rr, out),
135 RR::CName(rr) => StaticRecord::write_u16_len_prefixed_data(rr, out),
136 RR::DName(rr) => StaticRecord::write_u16_len_prefixed_data(rr, out),
137 RR::TLSA(rr) => StaticRecord::write_u16_len_prefixed_data(rr, out),
138 RR::DnsKey(rr) => StaticRecord::write_u16_len_prefixed_data(rr, out),
139 RR::DS(rr) => StaticRecord::write_u16_len_prefixed_data(rr, out),
140 RR::RRSig(rr) => StaticRecord::write_u16_len_prefixed_data(rr, out),
144 impl From<A> for RR { fn from(a: A) -> RR { RR::A(a) } }
145 impl From<AAAA> for RR { fn from(aaaa: AAAA) -> RR { RR::AAAA(aaaa) } }
146 impl From<NS> for RR { fn from(ns: NS) -> RR { RR::NS(ns) } }
147 impl From<Txt> for RR { fn from(txt: Txt) -> RR { RR::Txt(txt) } }
148 impl From<CName> for RR { fn from(cname: CName) -> RR { RR::CName(cname) } }
149 impl From<DName> for RR { fn from(cname: DName) -> RR { RR::DName(cname) } }
150 impl From<TLSA> for RR { fn from(tlsa: TLSA) -> RR { RR::TLSA(tlsa) } }
151 impl From<DnsKey> for RR { fn from(dnskey: DnsKey) -> RR { RR::DnsKey(dnskey) } }
152 impl From<DS> for RR { fn from(ds: DS) -> RR { RR::DS(ds) } }
153 impl From<RRSig> for RR { fn from(rrsig: RRSig) -> RR { RR::RRSig(rrsig) } }
155 pub(crate) trait StaticRecord : Ord + Sized {
156 // http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4
158 fn name(&self) -> &Name;
159 fn json(&self) -> String;
160 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>);
161 fn read_from_data(name: Name, data: &[u8], wire_packet: &[u8]) -> Result<Self, ()>;
163 /// A trait describing a resource record (including the [`RR`] enum).
164 pub trait Record : Ord {
165 /// The resource record type, as maintained by IANA.
167 /// Current assignments can be found at
168 /// <http://www.iana.org/assignments/dns-parameters/dns-parameters.xhtml#dns-parameters-4>
170 /// The name this record is at.
171 fn name(&self) -> &Name;
172 /// Gets a JSON encoding of this record.
173 fn json(&self) -> String;
174 /// Writes the data of this record, prefixed by a u16 length, to the given `Vec`.
175 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>);
177 impl<RR: StaticRecord> Record for RR {
178 fn ty(&self) -> u16 { RR::TYPE }
179 fn name(&self) -> &Name { RR::name(self) }
180 fn json(&self) -> String { RR::json(self) }
181 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
182 RR::write_u16_len_prefixed_data(self, out)
186 fn ty(&self) -> u16 { self.ty() }
187 fn name(&self) -> &Name { self.name() }
188 fn json(&self) -> String { self.json() }
189 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
190 self.write_u16_len_prefixed_data(out)
194 #[derive(Debug, Clone, PartialEq, Eq, Ord)]
195 /// A text resource record, containing arbitrary text data
197 /// The name this record is at.
199 /// The text record itself.
201 /// While this is generally UTF-8-valid, there is no specific requirement that it be, and thus
202 /// is an arbitrary series of bytes here.
205 /// The wire type for TXT records
206 pub const TXT_TYPE: u16 = 16;
207 impl PartialOrd for Txt {
208 fn partial_cmp(&self, o: &Txt) -> Option<Ordering> {
209 Some(self.name.cmp(&o.name)
211 // Compare in wire encoding form, i.e. compare in 255-byte chunks
212 for i in 1..(self.data.len() / 255) + 2 {
213 let start = (i - 1)*255;
214 let self_len = cmp::min(i * 255, self.data.len());
215 let o_len = cmp::min(i * 255, o.data.len());
216 let slice_cmp = self_len.cmp(&o_len)
217 .then_with(|| self.data[start..self_len].cmp(&o.data[start..o_len]));
218 if !slice_cmp.is_eq() { return slice_cmp; }
224 impl StaticRecord for Txt {
225 const TYPE: u16 = TXT_TYPE;
226 fn name(&self) -> &Name { &self.name }
227 fn json(&self) -> String {
228 if let Ok(s) = core::str::from_utf8(&self.data) {
229 if s.chars().all(|c| !c.is_control() && c != '"') {
230 return format!("{{\"type\":\"txt\",\"name\":\"{}\",\"contents\":\"{}\"}}", self.name.0, s);
233 format!("{{\"type\":\"txt\",\"name\":\"{}\",\"contents\":{:?}}}", self.name.0, &self.data[..])
235 fn read_from_data(name: Name, mut data: &[u8], _wire_packet: &[u8]) -> Result<Self, ()> {
236 let mut parsed_data = Vec::with_capacity(data.len().saturating_sub(1));
237 while !data.is_empty() {
238 let len = read_u8(&mut data)? as usize;
239 if data.len() < len { return Err(()); }
240 parsed_data.extend_from_slice(&data[..len]);
243 Ok(Txt { name, data: parsed_data })
245 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
246 let len = (self.data.len() + (self.data.len() + 254) / 255) as u16;
247 out.extend_from_slice(&len.to_be_bytes());
249 let mut data_write = &self.data[..];
250 out.extend_from_slice(&[data_write.len().try_into().unwrap_or(255)]);
251 while !data_write.is_empty() {
252 let split_pos = core::cmp::min(255, data_write.len());
253 out.extend_from_slice(&data_write[..split_pos]);
254 data_write = &data_write[split_pos..];
255 if !data_write.is_empty() {
256 out.extend_from_slice(&[data_write.len().try_into().unwrap_or(255)]);
262 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
263 /// A TLS Certificate Association resource record containing information about the TLS certificate
264 /// which should be expected when communicating with the host at the given name.
266 /// See <https://en.wikipedia.org/wiki/DNS-based_Authentication_of_Named_Entities#TLSA_RR> for more
269 /// The name this record is at.
271 /// The type of constraint on the TLS certificate(s) used which should be enforced by this
274 /// Whether to match on the full certificate, or only the public key.
276 /// The type of data included which is used to match the TLS certificate(s).
278 /// The certificate data or hash of the certificate data itself.
281 /// The wire type for TLSA records
282 pub const TLSA_TYPE: u16 = 52;
283 impl StaticRecord for TLSA {
284 const TYPE: u16 = TLSA_TYPE;
285 fn name(&self) -> &Name { &self.name }
286 fn json(&self) -> String {
287 let mut out = String::with_capacity(128+self.data.len()*2);
289 "{{\"type\":\"tlsa\",\"name\":\"{}\",\"usage\":{},\"selector\":{},\"data_ty\":{},\"data\":\"",
290 self.name.0, self.cert_usage, self.selector, self.data_ty
291 ).expect("Write to a String shouldn't fail");
292 for c in self.data.iter() {
293 write!(&mut out, "{:02X}", c)
294 .expect("Write to a String shouldn't fail");
299 fn read_from_data(name: Name, mut data: &[u8], _wire_packet: &[u8]) -> Result<Self, ()> {
301 name, cert_usage: read_u8(&mut data)?, selector: read_u8(&mut data)?,
302 data_ty: read_u8(&mut data)?, data: data.to_vec(),
305 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
306 let len = 3 + self.data.len();
307 out.extend_from_slice(&(len as u16).to_be_bytes());
308 out.extend_from_slice(&[self.cert_usage, self.selector, self.data_ty]);
309 out.extend_from_slice(&self.data);
313 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
314 /// A Canonical Name resource record, referring all queries for this name to another name.
316 /// The name this record is at.
318 /// The canonical name.
320 /// A resolver should use this name when looking up any further records for [`self.name`].
321 pub canonical_name: Name,
323 impl StaticRecord for CName {
325 fn name(&self) -> &Name { &self.name }
326 fn json(&self) -> String {
327 format!("{{\"type\":\"cname\",\"name\":\"{}\",\"canonical_name\":\"{}\"}}",
328 self.name.0, self.canonical_name.0)
330 fn read_from_data(name: Name, mut data: &[u8], wire_packet: &[u8]) -> Result<Self, ()> {
331 Ok(CName { name, canonical_name: read_wire_packet_name(&mut data, wire_packet)? })
333 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
334 let len: u16 = name_len(&self.canonical_name);
335 out.extend_from_slice(&len.to_be_bytes());
336 write_name(out, &self.canonical_name);
340 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
341 /// A Delegation Name resource record, referring all queries for subdomains of this name to another
342 /// subtree of the DNS.
344 /// The name this record is at.
346 /// The delegation name.
348 /// A resolver should use this domain name tree when looking up any further records for
349 /// subdomains of [`self.name`].
350 pub delegation_name: Name,
352 impl StaticRecord for DName {
353 const TYPE: u16 = 39;
354 fn name(&self) -> &Name { &self.name }
355 fn json(&self) -> String {
356 format!("{{\"type\":\"dname\",\"name\":\"{}\",\"delegation_name\":\"{}\"}}",
357 self.name.0, self.delegation_name.0)
359 fn read_from_data(name: Name, mut data: &[u8], wire_packet: &[u8]) -> Result<Self, ()> {
360 Ok(DName { name, delegation_name: read_wire_packet_name(&mut data, wire_packet)? })
362 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
363 let len: u16 = name_len(&self.delegation_name);
364 out.extend_from_slice(&len.to_be_bytes());
365 write_name(out, &self.delegation_name);
370 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
371 /// A public key resource record which can be used to validate [`RRSig`]s.
373 /// The name this record is at.
375 /// Flags which constrain the usage of this public key.
377 /// The protocol this key is used for (protocol `3` is DNSSEC).
379 /// The algorithm which this public key uses to sign data.
381 /// The public key itself.
384 impl StaticRecord for DnsKey {
385 const TYPE: u16 = 48;
386 fn name(&self) -> &Name { &self.name }
387 fn json(&self) -> String {
388 let mut out = String::with_capacity(128+self.pubkey.len()*2);
390 "{{\"type\":\"dnskey\",\"name\":\"{}\",\"flags\":{},\"protocol\":{},\"alg\":{},\"pubkey\":\"",
391 self.name.0, self.flags, self.protocol, self.alg
392 ).expect("Write to a String shouldn't fail");
393 for c in self.pubkey.iter() {
394 write!(&mut out, "{:02X}", c)
395 .expect("Write to a String shouldn't fail");
400 fn read_from_data(name: Name, mut data: &[u8], _wire_packet: &[u8]) -> Result<Self, ()> {
402 name, flags: read_u16(&mut data)?, protocol: read_u8(&mut data)?,
403 alg: read_u8(&mut data)?, pubkey: data.to_vec(),
406 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
407 let len = 2 + 1 + 1 + self.pubkey.len();
408 out.extend_from_slice(&(len as u16).to_be_bytes());
409 out.extend_from_slice(&self.flags.to_be_bytes());
410 out.extend_from_slice(&self.protocol.to_be_bytes());
411 out.extend_from_slice(&self.alg.to_be_bytes());
412 out.extend_from_slice(&self.pubkey);
416 /// A short (non-cryptographic) digest which can be used to refer to this [`DnsKey`].
417 pub fn key_tag(&self) -> u16 {
418 let mut res = u32::from(self.flags);
419 res += u32::from(self.protocol) << 8;
420 res += u32::from(self.alg);
421 for (idx, b) in self.pubkey.iter().enumerate() {
423 res += u32::from(*b) << 8;
425 res += u32::from(*b);
428 res += (res >> 16) & 0xffff;
429 (res & 0xffff) as u16
433 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
434 /// A Delegation Signer resource record which indicates that some alternative [`DnsKey`] can sign
435 /// for records in the zone which matches [`self.name`].
437 /// The name this record is at.
439 /// This is also the zone that a [`DnsKey`] which matches the [`Self::digest`] can sign for.
441 /// A short tag which describes the matching [`DnsKey`].
443 /// This matches the [`DnsKey::key_tag`] for the [`DnsKey`] which is referred to by this
446 /// The algorithm which the [`DnsKey`] referred to by this [`DS`] uses.
448 /// This matches the [`DnsKey::alg`] field in the referred-to [`DnsKey`].
450 /// The type of digest used to hash the referred-to [`DnsKey`].
452 /// The digest itself.
455 impl StaticRecord for DS {
456 const TYPE: u16 = 43;
457 fn name(&self) -> &Name { &self.name }
458 fn json(&self) -> String {
459 let mut out = String::with_capacity(128+self.digest.len()*2);
461 "{{\"type\":\"ds\",\"name\":\"{}\",\"key_tag\":{},\"alg\":{},\"digest_type\":{},\"digest\":\"",
462 self.name.0, self.key_tag, self.alg, self.digest_type
463 ).expect("Write to a String shouldn't fail");
464 for c in self.digest.iter() {
465 write!(&mut out, "{:02X}", c)
466 .expect("Write to a String shouldn't fail");
471 fn read_from_data(name: Name, mut data: &[u8], _wire_packet: &[u8]) -> Result<Self, ()> {
473 name, key_tag: read_u16(&mut data)?, alg: read_u8(&mut data)?,
474 digest_type: read_u8(&mut data)?, digest: data.to_vec(),
477 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
478 let len = 2 + 1 + 1 + self.digest.len();
479 out.extend_from_slice(&(len as u16).to_be_bytes());
480 out.extend_from_slice(&self.key_tag.to_be_bytes());
481 out.extend_from_slice(&self.alg.to_be_bytes());
482 out.extend_from_slice(&self.digest_type.to_be_bytes());
483 out.extend_from_slice(&self.digest);
487 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
488 /// A Resource Record (set) Signature resource record. This contains a signature over all the
489 /// resources records of the given type at the given name.
491 /// The name this record is at.
493 /// This is also the name of any records which this signature is covering (ignoring wildcards).
495 /// The resource record type which this [`RRSig`] is signing.
497 /// All resources records of this type at the same name as [`self.name`] must be signed by
500 /// The algorithm which is being used to sign.
502 /// This must match the [`DnsKey::alg`] field in the [`DnsKey`] being used to sign.
504 /// The number of labels in the name of the records that this signature is signing.
506 /// If this is less than the number of labels in [`self.name`], this signature is covering a
509 /// The TTL of the records which this [`RRSig`] is signing.
511 /// The expiration (as a UNIX timestamp) of this signature.
513 /// The time (as a UNIX timestamp) at which this signature becomes valid.
515 /// A short tag which describes the matching [`DnsKey`].
517 /// This matches the [`DnsKey::key_tag`] for the [`DnsKey`] which created this signature.
519 /// The [`DnsKey::name`] in the [`DnsKey`] which created this signature.
521 /// This must be a parent of [`self.name`].
523 /// [`DnsKey::name`]: Record::name
524 // We'd like to just link to the `DnsKey` member variable called `name`, but there doesn't
525 // appear to be a way to actually do that, so instead we have to link to the trait method.
527 /// The signature itself.
528 pub signature: Vec<u8>,
530 impl StaticRecord for RRSig {
531 const TYPE: u16 = 46;
532 fn name(&self) -> &Name { &self.name }
533 fn json(&self) -> String {
534 let mut out = String::with_capacity(256 + self.signature.len()*2);
536 "{{\"type\":\"ds\",\"name\":\"{}\",\"signed_record_type\":{},\"alg\":{},\"signed_labels\":{},\"orig_ttl\":{},\"expiration\"{},\"inception\":{},\"key_tag\":{},\"key_name\":\"{}\",\"signature\":\"",
537 self.name.0, self.ty, self.alg, self.labels, self.orig_ttl, self.expiration, self.inception, self.key_tag, self.key_name.0
538 ).expect("Write to a String shouldn't fail");
539 for c in self.signature.iter() {
540 write!(&mut out, "{:02X}", c)
541 .expect("Write to a String shouldn't fail");
546 fn read_from_data(name: Name, mut data: &[u8], wire_packet: &[u8]) -> Result<Self, ()> {
548 name, ty: read_u16(&mut data)?, alg: read_u8(&mut data)?,
549 labels: read_u8(&mut data)?, orig_ttl: read_u32(&mut data)?,
550 expiration: read_u32(&mut data)?, inception: read_u32(&mut data)?,
551 key_tag: read_u16(&mut data)?,
552 key_name: read_wire_packet_name(&mut data, wire_packet)?,
553 signature: data.to_vec(),
556 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
557 let len = 2 + 1 + 1 + 4*3 + 2 + name_len(&self.key_name) + self.signature.len() as u16;
558 out.extend_from_slice(&len.to_be_bytes());
559 out.extend_from_slice(&self.ty.to_be_bytes());
560 out.extend_from_slice(&self.alg.to_be_bytes());
561 out.extend_from_slice(&self.labels.to_be_bytes());
562 out.extend_from_slice(&self.orig_ttl.to_be_bytes());
563 out.extend_from_slice(&self.expiration.to_be_bytes());
564 out.extend_from_slice(&self.inception.to_be_bytes());
565 out.extend_from_slice(&self.key_tag.to_be_bytes());
566 write_name(out, &self.key_name);
567 out.extend_from_slice(&self.signature);
571 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
572 /// An IPv4 Address resource record
574 /// The name this record is at.
576 /// The bytes of the IPv4 address.
577 pub address: [u8; 4],
579 /// The wire type for A records
580 pub const A_TYPE: u16 = 1;
581 impl StaticRecord for A {
582 const TYPE: u16 = A_TYPE;
583 fn name(&self) -> &Name { &self.name }
584 fn json(&self) -> String {
585 format!("{{\"type\":\"a\",\"name\":\"{}\",\"address\":{:?}}}", self.name.0, self.address)
587 fn read_from_data(name: Name, data: &[u8], _wire_packet: &[u8]) -> Result<Self, ()> {
588 if data.len() != 4 { return Err(()); }
589 let mut address = [0; 4];
590 address.copy_from_slice(&data);
591 Ok(A { name, address })
593 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
594 out.extend_from_slice(&4u16.to_be_bytes());
595 out.extend_from_slice(&self.address);
599 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
600 /// An IPv6 Address resource record
602 /// The name this record is at.
604 /// The bytes of the IPv6 address.
605 pub address: [u8; 16],
607 /// The wire type for AAAA records
608 pub const AAAA_TYPE: u16 = 28;
609 impl StaticRecord for AAAA {
610 const TYPE: u16 = AAAA_TYPE;
611 fn name(&self) -> &Name { &self.name }
612 fn json(&self) -> String {
613 format!("{{\"type\":\"aaaa\",\"name\":\"{}\",\"address\":{:?}}}", self.name.0, self.address)
615 fn read_from_data(name: Name, data: &[u8], _wire_packet: &[u8]) -> Result<Self, ()> {
616 if data.len() != 16 { return Err(()); }
617 let mut address = [0; 16];
618 address.copy_from_slice(&data);
619 Ok(AAAA { name, address })
621 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
622 out.extend_from_slice(&16u16.to_be_bytes());
623 out.extend_from_slice(&self.address);
627 #[derive(Debug, Clone, PartialEq, Eq, PartialOrd, Ord)]
628 /// A Name Server resource record, which indicates the server responsible for handling queries for
631 /// The name this record is at.
633 /// This is also the zone which the server at [`Self::name_server`] is responsible for handling
636 /// The name of the server which is responsible for handling queries for the [`self.name`]
638 pub name_server: Name,
640 impl StaticRecord for NS {
642 fn name(&self) -> &Name { &self.name }
643 fn json(&self) -> String {
644 format!("{{\"type\":\"ns\",\"name\":\"{}\",\"ns\":\"{}\"}}", self.name.0, self.name_server.0)
646 fn read_from_data(name: Name, mut data: &[u8], wire_packet: &[u8]) -> Result<Self, ()> {
647 Ok(NS { name, name_server: read_wire_packet_name(&mut data, wire_packet)? })
649 fn write_u16_len_prefixed_data(&self, out: &mut Vec<u8>) {
650 out.extend_from_slice(&name_len(&self.name_server).to_be_bytes());
651 write_name(out, &self.name_server);