Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 1 | // Copyright 2013 The Chromium Authors. All rights reserved. |
| 2 | // Use of this source code is governed by a BSD-style license that can be |
| 3 | // found in the LICENSE file. |
| 4 | |
| 5 | #include "net/dns/mdns_client_impl.h" |
| 6 | |
| 7 | #include "base/bind.h" |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 8 | #include "base/message_loop/message_loop_proxy.h" |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 9 | #include "base/stl_util.h" |
| 10 | #include "base/time/default_clock.h" |
| 11 | #include "net/base/dns_util.h" |
| 12 | #include "net/base/net_errors.h" |
| 13 | #include "net/base/net_log.h" |
| 14 | #include "net/base/rand_callback.h" |
| 15 | #include "net/dns/dns_protocol.h" |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 16 | #include "net/dns/record_rdata.h" |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 17 | #include "net/udp/datagram_socket.h" |
| 18 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 19 | // TODO(gene): Remove this temporary method of disabling NSEC support once it |
| 20 | // becomes clear whether this feature should be |
| 21 | // supported. http://crbug.com/255232 |
| 22 | #define ENABLE_NSEC |
| 23 | |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 24 | namespace net { |
| 25 | |
| 26 | namespace { |
| 27 | const char kMDnsMulticastGroupIPv4[] = "224.0.0.251"; |
| 28 | const char kMDnsMulticastGroupIPv6[] = "FF02::FB"; |
| 29 | const unsigned MDnsTransactionTimeoutSeconds = 3; |
| 30 | } |
| 31 | |
| 32 | MDnsConnection::SocketHandler::SocketHandler( |
| 33 | MDnsConnection* connection, const IPEndPoint& multicast_addr, |
| 34 | MDnsConnection::SocketFactory* socket_factory) |
| 35 | : socket_(socket_factory->CreateSocket()), connection_(connection), |
| 36 | response_(new DnsResponse(dns_protocol::kMaxMulticastSize)), |
| 37 | multicast_addr_(multicast_addr) { |
| 38 | } |
| 39 | |
| 40 | MDnsConnection::SocketHandler::~SocketHandler() { |
| 41 | } |
| 42 | |
| 43 | int MDnsConnection::SocketHandler::Start() { |
| 44 | int rv = BindSocket(); |
| 45 | if (rv != OK) { |
| 46 | return rv; |
| 47 | } |
| 48 | |
| 49 | return DoLoop(0); |
| 50 | } |
| 51 | |
| 52 | int MDnsConnection::SocketHandler::DoLoop(int rv) { |
| 53 | do { |
| 54 | if (rv > 0) |
| 55 | connection_->OnDatagramReceived(response_.get(), recv_addr_, rv); |
| 56 | |
| 57 | rv = socket_->RecvFrom( |
| 58 | response_->io_buffer(), |
| 59 | response_->io_buffer()->size(), |
| 60 | &recv_addr_, |
| 61 | base::Bind(&MDnsConnection::SocketHandler::OnDatagramReceived, |
| 62 | base::Unretained(this))); |
| 63 | } while (rv > 0); |
| 64 | |
| 65 | if (rv != ERR_IO_PENDING) |
| 66 | return rv; |
| 67 | |
| 68 | return OK; |
| 69 | } |
| 70 | |
| 71 | void MDnsConnection::SocketHandler::OnDatagramReceived(int rv) { |
| 72 | if (rv >= OK) |
| 73 | rv = DoLoop(rv); |
| 74 | |
| 75 | if (rv != OK) |
| 76 | connection_->OnError(this, rv); |
| 77 | } |
| 78 | |
| 79 | int MDnsConnection::SocketHandler::Send(IOBuffer* buffer, unsigned size) { |
| 80 | return socket_->SendTo( |
| 81 | buffer, size, multicast_addr_, |
| 82 | base::Bind(&MDnsConnection::SocketHandler::SendDone, |
| 83 | base::Unretained(this) )); |
| 84 | } |
| 85 | |
| 86 | void MDnsConnection::SocketHandler::SendDone(int rv) { |
| 87 | // TODO(noamsml): Retry logic. |
| 88 | } |
| 89 | |
| 90 | int MDnsConnection::SocketHandler::BindSocket() { |
| 91 | IPAddressNumber address_any(multicast_addr_.address().size()); |
| 92 | |
| 93 | IPEndPoint bind_endpoint(address_any, multicast_addr_.port()); |
| 94 | |
| 95 | socket_->AllowAddressReuse(); |
| 96 | int rv = socket_->Listen(bind_endpoint); |
| 97 | |
| 98 | if (rv < OK) return rv; |
| 99 | |
| 100 | socket_->SetMulticastLoopbackMode(false); |
| 101 | |
| 102 | return socket_->JoinGroup(multicast_addr_.address()); |
| 103 | } |
| 104 | |
| 105 | MDnsConnection::MDnsConnection(MDnsConnection::SocketFactory* socket_factory, |
| 106 | MDnsConnection::Delegate* delegate) |
| 107 | : socket_handler_ipv4_(this, |
| 108 | GetMDnsIPEndPoint(kMDnsMulticastGroupIPv4), |
| 109 | socket_factory), |
| 110 | socket_handler_ipv6_(this, |
| 111 | GetMDnsIPEndPoint(kMDnsMulticastGroupIPv6), |
| 112 | socket_factory), |
| 113 | delegate_(delegate) { |
| 114 | } |
| 115 | |
| 116 | MDnsConnection::~MDnsConnection() { |
| 117 | } |
| 118 | |
| 119 | int MDnsConnection::Init() { |
| 120 | int rv; |
| 121 | |
| 122 | rv = socket_handler_ipv4_.Start(); |
| 123 | if (rv != OK) return rv; |
| 124 | rv = socket_handler_ipv6_.Start(); |
| 125 | if (rv != OK) return rv; |
| 126 | |
| 127 | return OK; |
| 128 | } |
| 129 | |
| 130 | int MDnsConnection::Send(IOBuffer* buffer, unsigned size) { |
| 131 | int rv; |
| 132 | |
| 133 | rv = socket_handler_ipv4_.Send(buffer, size); |
| 134 | if (rv < OK && rv != ERR_IO_PENDING) return rv; |
| 135 | |
| 136 | rv = socket_handler_ipv6_.Send(buffer, size); |
| 137 | if (rv < OK && rv != ERR_IO_PENDING) return rv; |
| 138 | |
| 139 | return OK; |
| 140 | } |
| 141 | |
| 142 | void MDnsConnection::OnError(SocketHandler* loop, |
| 143 | int error) { |
| 144 | // TODO(noamsml): Specific handling of intermittent errors that can be handled |
| 145 | // in the connection. |
| 146 | delegate_->OnConnectionError(error); |
| 147 | } |
| 148 | |
| 149 | IPEndPoint MDnsConnection::GetMDnsIPEndPoint(const char* address) { |
| 150 | IPAddressNumber multicast_group_number; |
| 151 | bool success = ParseIPLiteralToNumber(address, |
| 152 | &multicast_group_number); |
| 153 | DCHECK(success); |
| 154 | return IPEndPoint(multicast_group_number, |
| 155 | dns_protocol::kDefaultPortMulticast); |
| 156 | } |
| 157 | |
| 158 | void MDnsConnection::OnDatagramReceived( |
| 159 | DnsResponse* response, |
| 160 | const IPEndPoint& recv_addr, |
| 161 | int bytes_read) { |
| 162 | // TODO(noamsml): More sophisticated error handling. |
| 163 | DCHECK_GT(bytes_read, 0); |
| 164 | delegate_->HandlePacket(response, bytes_read); |
| 165 | } |
| 166 | |
| 167 | class MDnsConnectionSocketFactoryImpl |
| 168 | : public MDnsConnection::SocketFactory { |
| 169 | public: |
| 170 | MDnsConnectionSocketFactoryImpl(); |
| 171 | virtual ~MDnsConnectionSocketFactoryImpl(); |
| 172 | |
| 173 | virtual scoped_ptr<DatagramServerSocket> CreateSocket() OVERRIDE; |
| 174 | }; |
| 175 | |
| 176 | MDnsConnectionSocketFactoryImpl::MDnsConnectionSocketFactoryImpl() { |
| 177 | } |
| 178 | |
| 179 | MDnsConnectionSocketFactoryImpl::~MDnsConnectionSocketFactoryImpl() { |
| 180 | } |
| 181 | |
| 182 | scoped_ptr<DatagramServerSocket> |
| 183 | MDnsConnectionSocketFactoryImpl::CreateSocket() { |
| 184 | return scoped_ptr<DatagramServerSocket>(new UDPServerSocket( |
| 185 | NULL, NetLog::Source())); |
| 186 | } |
| 187 | |
| 188 | // static |
| 189 | scoped_ptr<MDnsConnection::SocketFactory> |
| 190 | MDnsConnection::SocketFactory::CreateDefault() { |
| 191 | return scoped_ptr<MDnsConnection::SocketFactory>( |
| 192 | new MDnsConnectionSocketFactoryImpl); |
| 193 | } |
| 194 | |
| 195 | MDnsClientImpl::Core::Core(MDnsClientImpl* client, |
| 196 | MDnsConnection::SocketFactory* socket_factory) |
| 197 | : client_(client), connection_(new MDnsConnection(socket_factory, this)) { |
| 198 | } |
| 199 | |
| 200 | MDnsClientImpl::Core::~Core() { |
| 201 | STLDeleteValues(&listeners_); |
| 202 | } |
| 203 | |
| 204 | bool MDnsClientImpl::Core::Init() { |
| 205 | return connection_->Init() == OK; |
| 206 | } |
| 207 | |
| 208 | bool MDnsClientImpl::Core::SendQuery(uint16 rrtype, std::string name) { |
| 209 | std::string name_dns; |
| 210 | if (!DNSDomainFromDot(name, &name_dns)) |
| 211 | return false; |
| 212 | |
| 213 | DnsQuery query(0, name_dns, rrtype); |
| 214 | query.set_flags(0); // Remove the RD flag from the query. It is unneeded. |
| 215 | |
| 216 | return connection_->Send(query.io_buffer(), query.io_buffer()->size()) == OK; |
| 217 | } |
| 218 | |
| 219 | void MDnsClientImpl::Core::HandlePacket(DnsResponse* response, |
| 220 | int bytes_read) { |
| 221 | unsigned offset; |
| 222 | // Note: We store cache keys rather than record pointers to avoid |
| 223 | // erroneous behavior in case a packet contains multiple exclusive |
| 224 | // records with the same type and name. |
| 225 | std::map<MDnsCache::Key, MDnsListener::UpdateType> update_keys; |
| 226 | |
| 227 | if (!response->InitParseWithoutQuery(bytes_read)) { |
| 228 | LOG(WARNING) << "Could not understand an mDNS packet."; |
| 229 | return; // Message is unreadable. |
| 230 | } |
| 231 | |
| 232 | // TODO(noamsml): duplicate query suppression. |
| 233 | if (!(response->flags() & dns_protocol::kFlagResponse)) |
| 234 | return; // Message is a query. ignore it. |
| 235 | |
| 236 | DnsRecordParser parser = response->Parser(); |
| 237 | unsigned answer_count = response->answer_count() + |
| 238 | response->additional_answer_count(); |
| 239 | |
| 240 | for (unsigned i = 0; i < answer_count; i++) { |
| 241 | offset = parser.GetOffset(); |
| 242 | scoped_ptr<const RecordParsed> record = RecordParsed::CreateFrom( |
| 243 | &parser, base::Time::Now()); |
| 244 | |
| 245 | if (!record) { |
| 246 | LOG(WARNING) << "Could not understand an mDNS record."; |
| 247 | |
| 248 | if (offset == parser.GetOffset()) { |
| 249 | LOG(WARNING) << "Abandoned parsing the rest of the packet."; |
| 250 | return; // The parser did not advance, abort reading the packet. |
| 251 | } else { |
| 252 | continue; // We may be able to extract other records from the packet. |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | if ((record->klass() & dns_protocol::kMDnsClassMask) != |
| 257 | dns_protocol::kClassIN) { |
| 258 | LOG(WARNING) << "Received an mDNS record with non-IN class. Ignoring."; |
| 259 | continue; // Ignore all records not in the IN class. |
| 260 | } |
| 261 | |
| 262 | MDnsCache::Key update_key = MDnsCache::Key::CreateFor(record.get()); |
| 263 | MDnsCache::UpdateType update = cache_.UpdateDnsRecord(record.Pass()); |
| 264 | |
| 265 | // Cleanup time may have changed. |
| 266 | ScheduleCleanup(cache_.next_expiration()); |
| 267 | |
| 268 | if (update != MDnsCache::NoChange) { |
| 269 | MDnsListener::UpdateType update_external; |
| 270 | |
| 271 | switch (update) { |
| 272 | case MDnsCache::RecordAdded: |
| 273 | update_external = MDnsListener::RECORD_ADDED; |
| 274 | break; |
| 275 | case MDnsCache::RecordChanged: |
| 276 | update_external = MDnsListener::RECORD_CHANGED; |
| 277 | break; |
| 278 | case MDnsCache::NoChange: |
| 279 | default: |
| 280 | NOTREACHED(); |
| 281 | // Dummy assignment to suppress compiler warning. |
| 282 | update_external = MDnsListener::RECORD_CHANGED; |
| 283 | break; |
| 284 | } |
| 285 | |
| 286 | update_keys.insert(std::make_pair(update_key, update_external)); |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | for (std::map<MDnsCache::Key, MDnsListener::UpdateType>::iterator i = |
| 291 | update_keys.begin(); i != update_keys.end(); i++) { |
| 292 | const RecordParsed* record = cache_.LookupKey(i->first); |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 293 | if (!record) |
| 294 | continue; |
| 295 | |
| 296 | if (record->type() == dns_protocol::kTypeNSEC) { |
| 297 | #if defined(ENABLE_NSEC) |
| 298 | NotifyNsecRecord(record); |
| 299 | #endif |
| 300 | } else { |
| 301 | AlertListeners(i->second, ListenerKey(record->name(), record->type()), |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 302 | record); |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 303 | } |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | void MDnsClientImpl::Core::NotifyNsecRecord(const RecordParsed* record) { |
| 308 | DCHECK_EQ(dns_protocol::kTypeNSEC, record->type()); |
| 309 | const NsecRecordRdata* rdata = record->rdata<NsecRecordRdata>(); |
| 310 | DCHECK(rdata); |
| 311 | |
| 312 | // Remove all cached records matching the nonexistent RR types. |
| 313 | std::vector<const RecordParsed*> records_to_remove; |
| 314 | |
| 315 | cache_.FindDnsRecords(0, record->name(), &records_to_remove, |
| 316 | base::Time::Now()); |
| 317 | |
| 318 | for (std::vector<const RecordParsed*>::iterator i = records_to_remove.begin(); |
| 319 | i != records_to_remove.end(); i++) { |
| 320 | if ((*i)->type() == dns_protocol::kTypeNSEC) |
| 321 | continue; |
| 322 | if (!rdata->GetBit((*i)->type())) { |
| 323 | scoped_ptr<const RecordParsed> record_removed = cache_.RemoveRecord((*i)); |
| 324 | DCHECK(record_removed); |
| 325 | OnRecordRemoved(record_removed.get()); |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | // Alert all listeners waiting for the nonexistent RR types. |
| 330 | ListenerMap::iterator i = |
| 331 | listeners_.upper_bound(ListenerKey(record->name(), 0)); |
| 332 | for (; i != listeners_.end() && i->first.first == record->name(); i++) { |
| 333 | if (!rdata->GetBit(i->first.second)) { |
| 334 | FOR_EACH_OBSERVER(MDnsListenerImpl, *i->second, AlertNsecRecord()); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 335 | } |
| 336 | } |
| 337 | } |
| 338 | |
| 339 | void MDnsClientImpl::Core::OnConnectionError(int error) { |
| 340 | // TODO(noamsml): On connection error, recreate connection and flush cache. |
| 341 | } |
| 342 | |
| 343 | void MDnsClientImpl::Core::AlertListeners( |
| 344 | MDnsListener::UpdateType update_type, |
| 345 | const ListenerKey& key, |
| 346 | const RecordParsed* record) { |
| 347 | ListenerMap::iterator listener_map_iterator = listeners_.find(key); |
| 348 | if (listener_map_iterator == listeners_.end()) return; |
| 349 | |
| 350 | FOR_EACH_OBSERVER(MDnsListenerImpl, *listener_map_iterator->second, |
| 351 | AlertDelegate(update_type, record)); |
| 352 | } |
| 353 | |
| 354 | void MDnsClientImpl::Core::AddListener( |
| 355 | MDnsListenerImpl* listener) { |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 356 | ListenerKey key(listener->GetName(), listener->GetType()); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 357 | std::pair<ListenerMap::iterator, bool> observer_insert_result = |
| 358 | listeners_.insert( |
| 359 | make_pair(key, static_cast<ObserverList<MDnsListenerImpl>*>(NULL))); |
| 360 | |
| 361 | // If an equivalent key does not exist, actually create the observer list. |
| 362 | if (observer_insert_result.second) |
| 363 | observer_insert_result.first->second = new ObserverList<MDnsListenerImpl>(); |
| 364 | |
| 365 | ObserverList<MDnsListenerImpl>* observer_list = |
| 366 | observer_insert_result.first->second; |
| 367 | |
| 368 | observer_list->AddObserver(listener); |
| 369 | } |
| 370 | |
| 371 | void MDnsClientImpl::Core::RemoveListener(MDnsListenerImpl* listener) { |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 372 | ListenerKey key(listener->GetName(), listener->GetType()); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 373 | ListenerMap::iterator observer_list_iterator = listeners_.find(key); |
| 374 | |
| 375 | DCHECK(observer_list_iterator != listeners_.end()); |
| 376 | DCHECK(observer_list_iterator->second->HasObserver(listener)); |
| 377 | |
| 378 | observer_list_iterator->second->RemoveObserver(listener); |
| 379 | |
| 380 | // Remove the observer list from the map if it is empty |
| 381 | if (observer_list_iterator->second->size() == 0) { |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 382 | // Schedule the actual removal for later in case the listener removal |
| 383 | // happens while iterating over the observer list. |
| 384 | base::MessageLoop::current()->PostTask( |
| 385 | FROM_HERE, base::Bind( |
| 386 | &MDnsClientImpl::Core::CleanupObserverList, AsWeakPtr(), key)); |
| 387 | } |
| 388 | } |
| 389 | |
| 390 | void MDnsClientImpl::Core::CleanupObserverList(const ListenerKey& key) { |
| 391 | ListenerMap::iterator found = listeners_.find(key); |
| 392 | if (found != listeners_.end() && found->second->size() == 0) { |
| 393 | delete found->second; |
| 394 | listeners_.erase(found); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 395 | } |
| 396 | } |
| 397 | |
| 398 | void MDnsClientImpl::Core::ScheduleCleanup(base::Time cleanup) { |
| 399 | // Cleanup is already scheduled, no need to do anything. |
| 400 | if (cleanup == scheduled_cleanup_) return; |
| 401 | scheduled_cleanup_ = cleanup; |
| 402 | |
| 403 | // This cancels the previously scheduled cleanup. |
| 404 | cleanup_callback_.Reset(base::Bind( |
| 405 | &MDnsClientImpl::Core::DoCleanup, base::Unretained(this))); |
| 406 | |
| 407 | // If |cleanup| is empty, then no cleanup necessary. |
| 408 | if (cleanup != base::Time()) { |
| 409 | base::MessageLoop::current()->PostDelayedTask( |
| 410 | FROM_HERE, |
| 411 | cleanup_callback_.callback(), |
| 412 | cleanup - base::Time::Now()); |
| 413 | } |
| 414 | } |
| 415 | |
| 416 | void MDnsClientImpl::Core::DoCleanup() { |
| 417 | cache_.CleanupRecords(base::Time::Now(), base::Bind( |
| 418 | &MDnsClientImpl::Core::OnRecordRemoved, base::Unretained(this))); |
| 419 | |
| 420 | ScheduleCleanup(cache_.next_expiration()); |
| 421 | } |
| 422 | |
| 423 | void MDnsClientImpl::Core::OnRecordRemoved( |
| 424 | const RecordParsed* record) { |
| 425 | AlertListeners(MDnsListener::RECORD_REMOVED, |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 426 | ListenerKey(record->name(), record->type()), record); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 427 | } |
| 428 | |
| 429 | void MDnsClientImpl::Core::QueryCache( |
| 430 | uint16 rrtype, const std::string& name, |
| 431 | std::vector<const RecordParsed*>* records) const { |
| 432 | cache_.FindDnsRecords(rrtype, name, records, base::Time::Now()); |
| 433 | } |
| 434 | |
| 435 | MDnsClientImpl::MDnsClientImpl( |
| 436 | scoped_ptr<MDnsConnection::SocketFactory> socket_factory) |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 437 | : socket_factory_(socket_factory.Pass()) { |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 438 | } |
| 439 | |
| 440 | MDnsClientImpl::~MDnsClientImpl() { |
| 441 | } |
| 442 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 443 | bool MDnsClientImpl::StartListening() { |
| 444 | DCHECK(!core_.get()); |
| 445 | core_.reset(new Core(this, socket_factory_.get())); |
| 446 | if (!core_->Init()) { |
| 447 | core_.reset(); |
| 448 | return false; |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 449 | } |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 450 | return true; |
| 451 | } |
| 452 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 453 | void MDnsClientImpl::StopListening() { |
| 454 | core_.reset(); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 455 | } |
| 456 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 457 | bool MDnsClientImpl::IsListening() const { |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 458 | return core_.get() != NULL; |
| 459 | } |
| 460 | |
| 461 | scoped_ptr<MDnsListener> MDnsClientImpl::CreateListener( |
| 462 | uint16 rrtype, |
| 463 | const std::string& name, |
| 464 | MDnsListener::Delegate* delegate) { |
| 465 | return scoped_ptr<net::MDnsListener>( |
| 466 | new MDnsListenerImpl(rrtype, name, delegate, this)); |
| 467 | } |
| 468 | |
| 469 | scoped_ptr<MDnsTransaction> MDnsClientImpl::CreateTransaction( |
| 470 | uint16 rrtype, |
| 471 | const std::string& name, |
| 472 | int flags, |
| 473 | const MDnsTransaction::ResultCallback& callback) { |
| 474 | return scoped_ptr<MDnsTransaction>( |
| 475 | new MDnsTransactionImpl(rrtype, name, flags, callback, this)); |
| 476 | } |
| 477 | |
| 478 | MDnsListenerImpl::MDnsListenerImpl( |
| 479 | uint16 rrtype, |
| 480 | const std::string& name, |
| 481 | MDnsListener::Delegate* delegate, |
| 482 | MDnsClientImpl* client) |
| 483 | : rrtype_(rrtype), name_(name), client_(client), delegate_(delegate), |
| 484 | started_(false) { |
| 485 | } |
| 486 | |
| 487 | bool MDnsListenerImpl::Start() { |
| 488 | DCHECK(!started_); |
| 489 | |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 490 | started_ = true; |
| 491 | |
| 492 | DCHECK(client_->core()); |
| 493 | client_->core()->AddListener(this); |
| 494 | |
| 495 | return true; |
| 496 | } |
| 497 | |
| 498 | MDnsListenerImpl::~MDnsListenerImpl() { |
| 499 | if (started_) { |
| 500 | DCHECK(client_->core()); |
| 501 | client_->core()->RemoveListener(this); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 502 | } |
| 503 | } |
| 504 | |
| 505 | const std::string& MDnsListenerImpl::GetName() const { |
| 506 | return name_; |
| 507 | } |
| 508 | |
| 509 | uint16 MDnsListenerImpl::GetType() const { |
| 510 | return rrtype_; |
| 511 | } |
| 512 | |
| 513 | void MDnsListenerImpl::AlertDelegate(MDnsListener::UpdateType update_type, |
| 514 | const RecordParsed* record) { |
| 515 | DCHECK(started_); |
| 516 | delegate_->OnRecordUpdate(update_type, record); |
| 517 | } |
| 518 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 519 | void MDnsListenerImpl::AlertNsecRecord() { |
| 520 | DCHECK(started_); |
| 521 | delegate_->OnNsecRecord(name_, rrtype_); |
| 522 | } |
| 523 | |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 524 | MDnsTransactionImpl::MDnsTransactionImpl( |
| 525 | uint16 rrtype, |
| 526 | const std::string& name, |
| 527 | int flags, |
| 528 | const MDnsTransaction::ResultCallback& callback, |
| 529 | MDnsClientImpl* client) |
| 530 | : rrtype_(rrtype), name_(name), callback_(callback), client_(client), |
| 531 | started_(false), flags_(flags) { |
| 532 | DCHECK((flags_ & MDnsTransaction::FLAG_MASK) == flags_); |
| 533 | DCHECK(flags_ & MDnsTransaction::QUERY_CACHE || |
| 534 | flags_ & MDnsTransaction::QUERY_NETWORK); |
| 535 | } |
| 536 | |
| 537 | MDnsTransactionImpl::~MDnsTransactionImpl() { |
| 538 | timeout_.Cancel(); |
| 539 | } |
| 540 | |
| 541 | bool MDnsTransactionImpl::Start() { |
| 542 | DCHECK(!started_); |
| 543 | started_ = true; |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 544 | |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 545 | base::WeakPtr<MDnsTransactionImpl> weak_this = AsWeakPtr(); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 546 | if (flags_ & MDnsTransaction::QUERY_CACHE) { |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 547 | ServeRecordsFromCache(); |
| 548 | |
| 549 | if (!weak_this || !is_active()) return true; |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 550 | } |
| 551 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 552 | if (flags_ & MDnsTransaction::QUERY_NETWORK) { |
| 553 | return QueryAndListen(); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 554 | } |
| 555 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 556 | // If this is a cache only query, signal that the transaction is over |
| 557 | // immediately. |
| 558 | SignalTransactionOver(); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 559 | return true; |
| 560 | } |
| 561 | |
| 562 | const std::string& MDnsTransactionImpl::GetName() const { |
| 563 | return name_; |
| 564 | } |
| 565 | |
| 566 | uint16 MDnsTransactionImpl::GetType() const { |
| 567 | return rrtype_; |
| 568 | } |
| 569 | |
| 570 | void MDnsTransactionImpl::CacheRecordFound(const RecordParsed* record) { |
| 571 | DCHECK(started_); |
| 572 | OnRecordUpdate(MDnsListener::RECORD_ADDED, record); |
| 573 | } |
| 574 | |
| 575 | void MDnsTransactionImpl::TriggerCallback(MDnsTransaction::Result result, |
| 576 | const RecordParsed* record) { |
| 577 | DCHECK(started_); |
| 578 | if (!is_active()) return; |
| 579 | |
| 580 | // Ensure callback is run after touching all class state, so that |
| 581 | // the callback can delete the transaction. |
| 582 | MDnsTransaction::ResultCallback callback = callback_; |
| 583 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 584 | // Reset the transaction if it expects a single result, or if the result |
| 585 | // is a final one (everything except for a record). |
| 586 | if (flags_ & MDnsTransaction::SINGLE_RESULT || |
| 587 | result != MDnsTransaction::RESULT_RECORD) { |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 588 | Reset(); |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 589 | } |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 590 | |
| 591 | callback.Run(result, record); |
| 592 | } |
| 593 | |
| 594 | void MDnsTransactionImpl::Reset() { |
| 595 | callback_.Reset(); |
| 596 | listener_.reset(); |
| 597 | timeout_.Cancel(); |
| 598 | } |
| 599 | |
| 600 | void MDnsTransactionImpl::OnRecordUpdate(MDnsListener::UpdateType update, |
| 601 | const RecordParsed* record) { |
| 602 | DCHECK(started_); |
| 603 | if (update == MDnsListener::RECORD_ADDED || |
| 604 | update == MDnsListener::RECORD_CHANGED) |
| 605 | TriggerCallback(MDnsTransaction::RESULT_RECORD, record); |
| 606 | } |
| 607 | |
| 608 | void MDnsTransactionImpl::SignalTransactionOver() { |
| 609 | DCHECK(started_); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 610 | if (flags_ & MDnsTransaction::SINGLE_RESULT) { |
| 611 | TriggerCallback(MDnsTransaction::RESULT_NO_RESULTS, NULL); |
| 612 | } else { |
| 613 | TriggerCallback(MDnsTransaction::RESULT_DONE, NULL); |
| 614 | } |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 615 | } |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 616 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 617 | void MDnsTransactionImpl::ServeRecordsFromCache() { |
| 618 | std::vector<const RecordParsed*> records; |
| 619 | base::WeakPtr<MDnsTransactionImpl> weak_this = AsWeakPtr(); |
| 620 | |
| 621 | if (client_->core()) { |
| 622 | client_->core()->QueryCache(rrtype_, name_, &records); |
| 623 | for (std::vector<const RecordParsed*>::iterator i = records.begin(); |
| 624 | i != records.end() && weak_this; ++i) { |
Ben Murdoch | bb1529c | 2013-08-08 10:24:53 +0100 | [diff] [blame^] | 625 | weak_this->TriggerCallback(MDnsTransaction::RESULT_RECORD, *i); |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 626 | } |
| 627 | |
| 628 | #if defined(ENABLE_NSEC) |
| 629 | if (records.empty()) { |
| 630 | DCHECK(weak_this); |
| 631 | client_->core()->QueryCache(dns_protocol::kTypeNSEC, name_, &records); |
| 632 | if (!records.empty()) { |
| 633 | const NsecRecordRdata* rdata = |
| 634 | records.front()->rdata<NsecRecordRdata>(); |
| 635 | DCHECK(rdata); |
| 636 | if (!rdata->GetBit(rrtype_)) |
| 637 | weak_this->TriggerCallback(MDnsTransaction::RESULT_NSEC, NULL); |
| 638 | } |
| 639 | } |
| 640 | #endif |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 641 | } |
| 642 | } |
| 643 | |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 644 | bool MDnsTransactionImpl::QueryAndListen() { |
| 645 | listener_ = client_->CreateListener(rrtype_, name_, this); |
| 646 | if (!listener_->Start()) |
| 647 | return false; |
| 648 | |
| 649 | DCHECK(client_->core()); |
| 650 | if (!client_->core()->SendQuery(rrtype_, name_)) |
| 651 | return false; |
| 652 | |
| 653 | timeout_.Reset(base::Bind(&MDnsTransactionImpl::SignalTransactionOver, |
| 654 | AsWeakPtr())); |
| 655 | base::MessageLoop::current()->PostDelayedTask( |
| 656 | FROM_HERE, |
| 657 | timeout_.callback(), |
| 658 | base::TimeDelta::FromSeconds(MDnsTransactionTimeoutSeconds)); |
| 659 | |
| 660 | return true; |
| 661 | } |
| 662 | |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 663 | void MDnsTransactionImpl::OnNsecRecord(const std::string& name, unsigned type) { |
Ben Murdoch | eb525c5 | 2013-07-10 11:40:50 +0100 | [diff] [blame] | 664 | TriggerCallback(RESULT_NSEC, NULL); |
Torne (Richard Coles) | 7d4cd47 | 2013-06-19 11:58:07 +0100 | [diff] [blame] | 665 | } |
| 666 | |
| 667 | void MDnsTransactionImpl::OnCachePurged() { |
| 668 | // TODO(noamsml): Cache purge situations not yet implemented |
| 669 | } |
| 670 | |
| 671 | } // namespace net |