git.bitcoin.ninja Git - dnssec-prover/blob - src/query.rs

   1 //! This module exposes utilities for building DNSSEC proofs by directly querying a recursive
   2 //! resolver.
   3
   4 use core::{cmp, ops};
   5 use alloc::vec;
   6 use alloc::vec::Vec;
   7
   8 #[cfg(feature = "std")]
   9 use std::net::{SocketAddr, TcpStream};
  10 #[cfg(feature = "std")]
  11 use std::io::{Read, Write, Error, ErrorKind};
  12
  13 #[cfg(feature = "tokio")]
  14 use tokio_crate::net::TcpStream as TokioTcpStream;
  15 #[cfg(feature = "tokio")]
  16 use tokio_crate::io::{AsyncReadExt, AsyncWriteExt};
  17
  18 use crate::rr::*;
  19 use crate::ser::*;
  20
  21 // In testing use a rather small buffer to ensure we hit the allocation paths sometimes. In
  22 // production, we should generally never actually need to go to heap as DNS messages are rarely
  23 // larger than a KiB or two.
  24 #[cfg(any(test, fuzzing))]
  25 const STACK_BUF_LIMIT: u16 = 32;
  26 #[cfg(not(any(test, fuzzing)))]
  27 const STACK_BUF_LIMIT: u16 = 2048;
  28
  29 /// A buffer for storing queries and responses.
  30 #[derive(Clone, PartialEq, Eq)]
  31 pub struct QueryBuf {
  32         buf: [u8; STACK_BUF_LIMIT as usize],
  33         heap_buf: Vec<u8>,
  34         len: u16,
  35 }
  36 impl QueryBuf {
  37         fn new_zeroed(len: u16) -> Self {
  38                 let heap_buf = if len > STACK_BUF_LIMIT { vec![0; len as usize] } else { Vec::new() };
  39                 Self {
  40                         buf: [0; STACK_BUF_LIMIT as usize],
  41                         heap_buf,
  42                         len
  43                 }
  44         }
  45         pub(crate) fn extend_from_slice(&mut self, sl: &[u8]) {
  46                 let new_len = self.len.saturating_add(sl.len() as u16);
  47                 let was_heap = self.len > STACK_BUF_LIMIT;
  48                 let is_heap = new_len > STACK_BUF_LIMIT;
  49                 if was_heap != is_heap {
  50                         self.heap_buf = vec![0; new_len as usize];
  51                         self.heap_buf[..self.len as usize].copy_from_slice(&self.buf[..self.len as usize]);
  52                 }
  53                 let target = if is_heap {
  54                         self.heap_buf.resize(new_len as usize, 0);
  55                         &mut self.heap_buf[self.len as usize..]
  56                 } else {
  57                         &mut self.buf[self.len as usize..new_len as usize]
  58                 };
  59                 target.copy_from_slice(sl);
  60                 self.len = new_len;
  61         }
  62 }
  63 impl ops::Deref for QueryBuf {
  64         type Target = [u8];
  65         fn deref(&self) -> &[u8] {
  66                 if self.len > STACK_BUF_LIMIT {
  67                         &self.heap_buf
  68                 } else {
  69                         &self.buf[..self.len as usize]
  70                 }
  71         }
  72 }
  73 impl ops::DerefMut for QueryBuf {
  74         fn deref_mut(&mut self) -> &mut [u8] {
  75                 if self.len > STACK_BUF_LIMIT {
  76                         &mut self.heap_buf
  77                 } else {
  78                         &mut self.buf[..self.len as usize]
  79                 }
  80         }
  81 }
  82
  83 // We don't care about transaction IDs as we're only going to accept signed data. Thus, we use
  84 // this constant instead of a random value.
  85 const TXID: u16 = 0x4242;
  86
  87 fn build_query(domain: &Name, ty: u16) -> QueryBuf {
  88         let mut query = QueryBuf::new_zeroed(0);
  89         let query_msg_len: u16 = 2 + 2 + 8 + 2 + 2 + name_len(domain) + 11;
  90         query.extend_from_slice(&query_msg_len.to_be_bytes());
  91         query.extend_from_slice(&TXID.to_be_bytes());
  92         query.extend_from_slice(&[0x01, 0x20]); // Flags: Recursive, Authenticated Data
  93         query.extend_from_slice(&[0, 1, 0, 0, 0, 0, 0, 1]); // One question, One additional
  94         write_name(&mut query, domain);
  95         query.extend_from_slice(&ty.to_be_bytes());
  96         query.extend_from_slice(&1u16.to_be_bytes()); // INternet class
  97         query.extend_from_slice(&[0, 0, 0x29]); // . OPT
  98         query.extend_from_slice(&0u16.to_be_bytes()); // 0 UDP payload size
  99         query.extend_from_slice(&[0, 0]); // EDNS version 0
 100         query.extend_from_slice(&0x8000u16.to_be_bytes()); // Accept DNSSEC RRs
 101         query.extend_from_slice(&0u16.to_be_bytes()); // No additional data
 102         query
 103 }
 104
 105 #[cfg(fuzzing)]
 106 /// Read some input and parse it as if it came from a server, for fuzzing.
 107 pub fn fuzz_response(response: &[u8]) {
 108         let (mut proof, mut names) = (Vec::new(), Vec::new());
 109         let _ = handle_response(response, &mut proof, &mut names);
 110 }
 111
 112 fn handle_response(resp: &[u8], proof: &mut Vec<u8>, rrsig_key_names: &mut Vec<Name>) -> Result<u32, ()> {
 113         let mut read: &[u8] = resp;
 114         if read_u16(&mut read)? != TXID { return Err(()); }
 115         // 2 byte transaction ID
 116         let flags = read_u16(&mut read)?;
 117         if flags & 0b1000_0000_0000_0000 == 0 {
 118                 return Err(());
 119         }
 120         if flags & 0b0111_1010_0000_0111 != 0 {
 121                 return Err(());
 122         }
 123         if flags & 0b10_0000 == 0 {
 124                 return Err(());
 125         }
 126         let questions = read_u16(&mut read)?;
 127         if questions != 1 { return Err(()); }
 128         let answers = read_u16(&mut read)?;
 129         if answers == 0 { return Err(()); }
 130         let _authorities = read_u16(&mut read)?;
 131         let _additional = read_u16(&mut read)?;
 132
 133         for _ in 0..questions {
 134                 read_wire_packet_name(&mut read, resp)?;
 135                 read_u16(&mut read)?; // type
 136                 read_u16(&mut read)?; // class
 137         }
 138
 139         // Only read the answers (skip authorities and additional) as that's all we care about.
 140         let mut min_ttl = u32::MAX;
 141         for _ in 0..answers {
 142                 let (rr, ttl) = parse_wire_packet_rr(&mut read, &resp)?;
 143                 write_rr(&rr, ttl, proof);
 144                 min_ttl = cmp::min(min_ttl, ttl);
 145                 if let RR::RRSig(rrsig) = rr { rrsig_key_names.push(rrsig.key_name); }
 146         }
 147         Ok(min_ttl)
 148 }
 149
 150 #[cfg(fuzzing)]
 151 /// Read a stream of responses and handle them it as if they came from a server, for fuzzing.
 152 pub fn fuzz_proof_builder(mut response_stream: &[u8]) {
 153         let (mut builder, _) = ProofBuilder::new(&"example.com.".try_into().unwrap(), Txt::TYPE);
 154         while builder.awaiting_responses() {
 155                 let len = if let Ok(len) = read_u16(&mut response_stream) { len } else { return };
 156                 let mut buf = QueryBuf::new_zeroed(len);
 157                 if response_stream.len() < len as usize { return; }
 158                 buf.copy_from_slice(&response_stream[..len as usize]);
 159                 response_stream = &response_stream[len as usize..];
 160                 let _ = builder.process_response(&buf);
 161         }
 162         let _ = builder.finish_proof();
 163 }
 164
 165 const MAX_REQUESTS: usize = 10;
 166 /// A simple state machine which will generate a series of queries and process the responses until
 167 /// it has built a DNSSEC proof.
 168 ///
 169 /// A [`ProofBuilder`] driver starts with [`ProofBuilder::new`], fetching the state machine and
 170 /// initial query. As long as [`ProofBuilder::awaiting_responses`] returns true, responses should
 171 /// be read from the resolver. For each query response read from the DNS resolver,
 172 /// [`ProofBuilder::process_response`] should be called, and each fresh query returned should be
 173 /// sent to the resolver. Once [`ProofBuilder::awaiting_responses`] returns false,
 174 /// [`ProofBuilder::finish_proof`] should be called to fetch the resulting proof.
 175 pub struct ProofBuilder {
 176         proof: Vec<u8>,
 177         min_ttl: u32,
 178         dnskeys_requested: Vec<Name>,
 179         pending_queries: usize,
 180         queries_made: usize,
 181 }
 182
 183 impl ProofBuilder {
 184         /// Constructs a new [`ProofBuilder`] and an initial query to send to the recursive resolver to
 185         /// begin the proof building process.
 186         ///
 187         /// Given a correctly-functioning resolver the proof will ultimately be able to prove the
 188         /// contents of any records with the given `ty`pe at the given `name` (as long as the given
 189         /// `ty`pe is supported by this library).
 190         ///
 191         /// You can find constants for supported standard types in the [`crate::rr`] module.
 192         pub fn new(name: &Name, ty: u16) -> (ProofBuilder, QueryBuf) {
 193                 let initial_query = build_query(name, ty);
 194                 (ProofBuilder {
 195                         proof: Vec::new(),
 196                         min_ttl: u32::MAX,
 197                         dnskeys_requested: Vec::with_capacity(MAX_REQUESTS),
 198                         pending_queries: 1,
 199                         queries_made: 1,
 200                 }, initial_query)
 201         }
 202
 203         /// Returns true as long as further responses are expected from the resolver.
 204         ///
 205         /// As long as this returns true, responses should be read from the resolver and passed to
 206         /// [`Self::process_response`]. Once this returns false, [`Self::finish_proof`] should be used
 207         /// to (possibly) get the final proof.
 208         pub fn awaiting_responses(&self) -> bool {
 209                 self.pending_queries > 0 && self.queries_made <= MAX_REQUESTS
 210         }
 211
 212         /// Processes a query response from the recursive resolver, returning a list of new queries to
 213         /// send to the resolver.
 214         pub fn process_response(&mut self, resp: &QueryBuf) -> Result<Vec<QueryBuf>, ()> {
 215                 if self.pending_queries == 0 { return Err(()); }
 216
 217                 let mut rrsig_key_names = Vec::new();
 218                 let min_ttl = handle_response(&resp, &mut self.proof, &mut rrsig_key_names)?;
 219                 self.min_ttl = cmp::min(self.min_ttl, min_ttl);
 220                 self.pending_queries -= 1;
 221
 222                 rrsig_key_names.sort_unstable();
 223                 rrsig_key_names.dedup();
 224
 225                 let mut new_queries = Vec::with_capacity(2);
 226                 for key_name in rrsig_key_names.drain(..) {
 227                         if !self.dnskeys_requested.contains(&key_name) {
 228                                 new_queries.push(build_query(&key_name, DnsKey::TYPE));
 229                                 self.pending_queries += 1;
 230                                 self.queries_made += 1;
 231                                 self.dnskeys_requested.push(key_name.clone());
 232
 233                                 if key_name.as_str() != "." {
 234                                         new_queries.push(build_query(&key_name, DS::TYPE));
 235                                         self.pending_queries += 1;
 236                                         self.queries_made += 1;
 237                                 }
 238                         }
 239                 }
 240                 if self.queries_made <= MAX_REQUESTS {
 241                         Ok(new_queries)
 242                 } else {
 243                         Ok(Vec::new())
 244                 }
 245         }
 246
 247         /// Finalizes the proof, if one is available, and returns it as well as the TTL that should be
 248         /// used to cache the proof (i.e. the lowest TTL of all records which were used to build the
 249         /// proof).
 250         pub fn finish_proof(self) -> Result<(Vec<u8>, u32), ()> {
 251                 if self.pending_queries > 0 || self.queries_made > MAX_REQUESTS {
 252                         Err(())
 253                 } else {
 254                         Ok((self.proof, self.min_ttl))
 255                 }
 256         }
 257 }
 258
 259 #[cfg(feature = "std")]
 260 fn send_query(stream: &mut TcpStream, query: &[u8]) -> Result<(), Error> {
 261         stream.write_all(&query)?;
 262         Ok(())
 263 }
 264
 265 #[cfg(feature = "tokio")]
 266 async fn send_query_async(stream: &mut TokioTcpStream, query: &[u8]) -> Result<(), Error> {
 267         stream.write_all(&query).await?;
 268         Ok(())
 269 }
 270
 271 #[cfg(feature = "std")]
 272 fn read_response(stream: &mut TcpStream) -> Result<QueryBuf, Error> {
 273         let mut len_bytes = [0; 2];
 274         stream.read_exact(&mut len_bytes)?;
 275         let mut buf = QueryBuf::new_zeroed(u16::from_be_bytes(len_bytes));
 276         stream.read_exact(&mut buf)?;
 277         Ok(buf)
 278 }
 279
 280 #[cfg(feature = "tokio")]
 281 async fn read_response_async(stream: &mut TokioTcpStream) -> Result<QueryBuf, Error> {
 282         let mut len_bytes = [0; 2];
 283         stream.read_exact(&mut len_bytes).await?;
 284         let mut buf = QueryBuf::new_zeroed(u16::from_be_bytes(len_bytes));
 285         stream.read_exact(&mut buf).await?;
 286         Ok(buf)
 287 }
 288
 289 #[cfg(feature = "std")]
 290 macro_rules! build_proof_impl {
 291         ($stream: ident, $send_query: ident, $read_response: ident, $domain: expr, $ty: expr $(, $async_ok: tt)?) => { {
 292                 // We require the initial query to have already gone out, and assume our resolver will
 293                 // return any CNAMEs all the way to the final record in the response. From there, we just
 294                 // have to take any RRSIGs in the response and walk them up to the root. We do so
 295                 // iteratively, sending DNSKEY and DS lookups after every response, deduplicating requests
 296                 // using `dnskeys_requested`.
 297                 let (mut builder, initial_query) = ProofBuilder::new($domain, $ty);
 298                 $send_query(&mut $stream, &initial_query)
 299                         $(.await?; $async_ok)??; // Either await?; Ok(())?, or just ?
 300                 while builder.awaiting_responses() {
 301                         let response = $read_response(&mut $stream)
 302                                 $(.await?; $async_ok)??; // Either await?; Ok(())?, or just ?
 303                         let new_queries = builder.process_response(&response)
 304                                 .map_err(|()| Error::new(ErrorKind::Other, "Bad response"))?;
 305                         for query in new_queries {
 306                                 $send_query(&mut $stream, &query)
 307                                         $(.await?; $async_ok)??; // Either await?; Ok(())?, or just ?
 308                         }
 309                 }
 310
 311                 builder.finish_proof()
 312                         .map_err(|()| Error::new(ErrorKind::Other, "Too many requests required"))
 313         } }
 314 }
 315
 316 #[cfg(feature = "std")]
 317 fn build_proof(resolver: SocketAddr, domain: &Name, ty: u16) -> Result<(Vec<u8>, u32), Error> {
 318         let mut stream = TcpStream::connect(resolver)?;
 319         build_proof_impl!(stream, send_query, read_response, domain, ty)
 320 }
 321
 322 #[cfg(feature = "tokio")]
 323 async fn build_proof_async(resolver: SocketAddr, domain: &Name, ty: u16) -> Result<(Vec<u8>, u32), Error> {
 324         let mut stream = TokioTcpStream::connect(resolver).await?;
 325         build_proof_impl!(stream, send_query_async, read_response_async, domain, ty, { Ok::<(), Error>(()) })
 326 }
 327
 328 /// Builds a DNSSEC proof for an A record by querying a recursive resolver, returning the proof as
 329 /// well as the TTL for the proof provided by the recursive resolver.
 330 ///
 331 /// Note that this proof is NOT verified in any way, you need to use the [`crate::validation`]
 332 /// module to validate the records contained.
 333 #[cfg(feature = "std")]
 334 pub fn build_a_proof(resolver: SocketAddr, domain: &Name) -> Result<(Vec<u8>, u32), Error> {
 335         build_proof(resolver, domain, A::TYPE)
 336 }
 337
 338 /// Builds a DNSSEC proof for an AAAA record by querying a recursive resolver, returning the proof
 339 /// as well as the TTL for the proof provided by the recursive resolver.
 340 ///
 341 /// Note that this proof is NOT verified in any way, you need to use the [`crate::validation`]
 342 /// module to validate the records contained.
 343 #[cfg(feature = "std")]
 344 pub fn build_aaaa_proof(resolver: SocketAddr, domain: &Name) -> Result<(Vec<u8>, u32), Error> {
 345         build_proof(resolver, domain, AAAA::TYPE)
 346 }
 347
 348 /// Builds a DNSSEC proof for an TXT record by querying a recursive resolver, returning the proof
 349 /// as well as the TTL for the proof provided by the recursive resolver.
 350 ///
 351 /// Note that this proof is NOT verified in any way, you need to use the [`crate::validation`]
 352 /// module to validate the records contained.
 353 #[cfg(feature = "std")]
 354 pub fn build_txt_proof(resolver: SocketAddr, domain: &Name) -> Result<(Vec<u8>, u32), Error> {
 355         build_proof(resolver, domain, Txt::TYPE)
 356 }
 357
 358 /// Builds a DNSSEC proof for an TLSA record by querying a recursive resolver, returning the proof
 359 /// as well as the TTL for the proof provided by the recursive resolver.
 360 ///
 361 /// Note that this proof is NOT verified in any way, you need to use the [`crate::validation`]
 362 /// module to validate the records contained.
 363 #[cfg(feature = "std")]
 364 pub fn build_tlsa_proof(resolver: SocketAddr, domain: &Name) -> Result<(Vec<u8>, u32), Error> {
 365         build_proof(resolver, domain, TLSA::TYPE)
 366 }
 367
 368
 369 /// Builds a DNSSEC proof for an A record by querying a recursive resolver, returning the proof as
 370 /// well as the TTL for the proof provided by the recursive resolver.
 371 ///
 372 /// Note that this proof is NOT verified in any way, you need to use the [`crate::validation`]
 373 /// module to validate the records contained.
 374 #[cfg(feature = "tokio")]
 375 pub async fn build_a_proof_async(resolver: SocketAddr, domain: &Name) -> Result<(Vec<u8>, u32), Error> {
 376         build_proof_async(resolver, domain, A::TYPE).await
 377 }
 378
 379 /// Builds a DNSSEC proof for an AAAA record by querying a recursive resolver, returning the proof
 380 /// as well as the TTL for the proof provided by the recursive resolver.
 381 ///
 382 /// Note that this proof is NOT verified in any way, you need to use the [`crate::validation`]
 383 /// module to validate the records contained.
 384 #[cfg(feature = "tokio")]
 385 pub async fn build_aaaa_proof_async(resolver: SocketAddr, domain: &Name) -> Result<(Vec<u8>, u32), Error> {
 386         build_proof_async(resolver, domain, AAAA::TYPE).await
 387 }
 388
 389 /// Builds a DNSSEC proof for an TXT record by querying a recursive resolver, returning the proof
 390 /// as well as the TTL for the proof provided by the recursive resolver.
 391 ///
 392 /// Note that this proof is NOT verified in any way, you need to use the [`crate::validation`]
 393 /// module to validate the records contained.
 394 #[cfg(feature = "tokio")]
 395 pub async fn build_txt_proof_async(resolver: SocketAddr, domain: &Name) -> Result<(Vec<u8>, u32), Error> {
 396         build_proof_async(resolver, domain, Txt::TYPE).await
 397 }
 398
 399 /// Builds a DNSSEC proof for an TLSA record by querying a recursive resolver, returning the proof
 400 /// as well as the TTL for the proof provided by the recursive resolver.
 401 ///
 402 /// Note that this proof is NOT verified in any way, you need to use the [`crate::validation`]
 403 /// module to validate the records contained.
 404 #[cfg(feature = "tokio")]
 405 pub async fn build_tlsa_proof_async(resolver: SocketAddr, domain: &Name) -> Result<(Vec<u8>, u32), Error> {
 406         build_proof_async(resolver, domain, TLSA::TYPE).await
 407 }
 408
 409 #[cfg(all(feature = "validation", feature = "std", test))]
 410 mod tests {
 411         use super::*;
 412         use crate::validation::*;
 413
 414         use rand::seq::SliceRandom;
 415
 416         use std::net::ToSocketAddrs;
 417         use std::time::SystemTime;
 418
 419         #[test]
 420         fn test_cloudflare_txt_query() {
 421                 let sockaddr = "8.8.8.8:53".to_socket_addrs().unwrap().next().unwrap();
 422                 let query_name = "cloudflare.com.".try_into().unwrap();
 423                 let (proof, _) = build_txt_proof(sockaddr, &query_name).unwrap();
 424
 425                 let mut rrs = parse_rr_stream(&proof).unwrap();
 426                 rrs.shuffle(&mut rand::rngs::OsRng);
 427                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 428                 assert!(verified_rrs.verified_rrs.len() > 1);
 429
 430                 let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 431                 assert!(verified_rrs.valid_from < now);
 432                 assert!(verified_rrs.expires > now);
 433         }
 434
 435         #[test]
 436         fn test_sha1_query() {
 437                 let sockaddr = "8.8.8.8:53".to_socket_addrs().unwrap().next().unwrap();
 438                 let query_name = "benthecarman.com.".try_into().unwrap();
 439                 let (proof, _) = build_a_proof(sockaddr, &query_name).unwrap();
 440
 441                 let mut rrs = parse_rr_stream(&proof).unwrap();
 442                 rrs.shuffle(&mut rand::rngs::OsRng);
 443                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 444                 assert!(verified_rrs.verified_rrs.len() >= 1);
 445
 446                 let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 447                 assert!(verified_rrs.valid_from < now);
 448                 assert!(verified_rrs.expires > now);
 449         }
 450
 451         #[test]
 452         fn test_txt_query() {
 453                 let sockaddr = "8.8.8.8:53".to_socket_addrs().unwrap().next().unwrap();
 454                 let query_name = "matt.user._bitcoin-payment.mattcorallo.com.".try_into().unwrap();
 455                 let (proof, _) = build_txt_proof(sockaddr, &query_name).unwrap();
 456
 457                 let mut rrs = parse_rr_stream(&proof).unwrap();
 458                 rrs.shuffle(&mut rand::rngs::OsRng);
 459                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 460                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 461
 462                 let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 463                 assert!(verified_rrs.valid_from < now);
 464                 assert!(verified_rrs.expires > now);
 465         }
 466
 467         #[test]
 468         fn test_cname_query() {
 469                 for resolver in ["1.1.1.1:53", "8.8.8.8:53", "9.9.9.9:53"] {
 470                         let sockaddr = resolver.to_socket_addrs().unwrap().next().unwrap();
 471                         let query_name = "cname_test.matcorallo.com.".try_into().unwrap();
 472                         let (proof, _) = build_txt_proof(sockaddr, &query_name).unwrap();
 473
 474                         let mut rrs = parse_rr_stream(&proof).unwrap();
 475                         rrs.shuffle(&mut rand::rngs::OsRng);
 476                         let verified_rrs = verify_rr_stream(&rrs).unwrap();
 477                         assert_eq!(verified_rrs.verified_rrs.len(), 2);
 478
 479                         let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 480                         assert!(verified_rrs.valid_from < now);
 481                         assert!(verified_rrs.expires > now);
 482
 483                         let resolved_rrs = verified_rrs.resolve_name(&query_name);
 484                         assert_eq!(resolved_rrs.len(), 1);
 485                         if let RR::Txt(txt) = &resolved_rrs[0] {
 486                                 assert_eq!(txt.name.as_str(), "txt_test.matcorallo.com.");
 487                                 assert_eq!(txt.data, b"dnssec_prover_test");
 488                         } else { panic!(); }
 489                 }
 490         }
 491
 492         #[cfg(feature = "tokio")]
 493         use tokio_crate as tokio;
 494
 495         #[cfg(feature = "tokio")]
 496         #[tokio::test]
 497         async fn test_txt_query_async() {
 498                 let sockaddr = "8.8.8.8:53".to_socket_addrs().unwrap().next().unwrap();
 499                 let query_name = "matt.user._bitcoin-payment.mattcorallo.com.".try_into().unwrap();
 500                 let (proof, _) = build_txt_proof_async(sockaddr, &query_name).await.unwrap();
 501
 502                 let mut rrs = parse_rr_stream(&proof).unwrap();
 503                 rrs.shuffle(&mut rand::rngs::OsRng);
 504                 let verified_rrs = verify_rr_stream(&rrs).unwrap();
 505                 assert_eq!(verified_rrs.verified_rrs.len(), 1);
 506
 507                 let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 508                 assert!(verified_rrs.valid_from < now);
 509                 assert!(verified_rrs.expires > now);
 510         }
 511
 512         #[cfg(feature = "tokio")]
 513         #[tokio::test]
 514         async fn test_cross_domain_cname_query_async() {
 515                 for resolver in ["1.1.1.1:53", "8.8.8.8:53", "9.9.9.9:53"] {
 516                         let sockaddr = resolver.to_socket_addrs().unwrap().next().unwrap();
 517                         let query_name = "wildcard.x_domain_cname_wild.matcorallo.com.".try_into().unwrap();
 518                         let (proof, _) = build_txt_proof_async(sockaddr, &query_name).await.unwrap();
 519
 520                         let mut rrs = parse_rr_stream(&proof).unwrap();
 521                         rrs.shuffle(&mut rand::rngs::OsRng);
 522                         let verified_rrs = verify_rr_stream(&rrs).unwrap();
 523                         assert_eq!(verified_rrs.verified_rrs.len(), 2);
 524
 525                         let now = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 526                         assert!(verified_rrs.valid_from < now);
 527                         assert!(verified_rrs.expires > now);
 528
 529                         let resolved_rrs = verified_rrs.resolve_name(&query_name);
 530                         assert_eq!(resolved_rrs.len(), 1);
 531                         if let RR::Txt(txt) = &resolved_rrs[0] {
 532                                 assert_eq!(txt.name.as_str(), "matt.user._bitcoin-payment.mattcorallo.com.");
 533                                 assert!(txt.data.starts_with(b"bitcoin:"));
 534                         } else { panic!(); }
 535                 }
 536         }
 537 }