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| 1 // Copyright (c) 2012 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/async_host_resolver.h" | |
| 6 | |
| 7 #include <algorithm> | |
| 8 | |
| 9 #include "base/bind.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "base/message_loop.h" | |
| 12 #include "base/rand_util.h" | |
| 13 #include "base/stl_util.h" | |
| 14 #include "base/values.h" | |
| 15 #include "net/base/address_list.h" | |
| 16 #include "net/base/dns_util.h" | |
| 17 #include "net/base/net_errors.h" | |
| 18 #include "net/dns/dns_protocol.h" | |
| 19 #include "net/dns/dns_response.h" | |
| 20 #include "net/dns/dns_session.h" | |
| 21 #include "net/socket/client_socket_factory.h" | |
| 22 | |
| 23 namespace net { | |
| 24 | |
| 25 namespace { | |
| 26 | |
| 27 // TODO(agayev): fix this when IPv6 support is added. | |
| 28 uint16 QueryTypeFromAddressFamily(AddressFamily address_family) { | |
| 29 return dns_protocol::kTypeA; | |
| 30 } | |
| 31 | |
| 32 class RequestParameters : public NetLog::EventParameters { | |
| 33 public: | |
| 34 RequestParameters(const HostResolver::RequestInfo& info, | |
| 35 const NetLog::Source& source) | |
| 36 : info_(info), source_(source) {} | |
| 37 | |
| 38 virtual Value* ToValue() const { | |
| 39 DictionaryValue* dict = new DictionaryValue(); | |
| 40 dict->SetString("hostname", info_.host_port_pair().ToString()); | |
| 41 dict->SetInteger("address_family", | |
| 42 static_cast<int>(info_.address_family())); | |
| 43 dict->SetBoolean("allow_cached_response", info_.allow_cached_response()); | |
| 44 dict->SetBoolean("is_speculative", info_.is_speculative()); | |
| 45 dict->SetInteger("priority", info_.priority()); | |
| 46 | |
| 47 if (source_.is_valid()) | |
| 48 dict->Set("source_dependency", source_.ToValue()); | |
| 49 | |
| 50 return dict; | |
| 51 } | |
| 52 | |
| 53 private: | |
| 54 const HostResolver::RequestInfo info_; | |
| 55 const NetLog::Source source_; | |
| 56 }; | |
| 57 | |
| 58 } // namespace | |
| 59 | |
| 60 HostResolver* CreateAsyncHostResolver(size_t max_concurrent_resolves, | |
| 61 const IPAddressNumber& dns_ip, | |
| 62 NetLog* net_log) { | |
| 63 size_t max_dns_requests = max_concurrent_resolves; | |
| 64 if (max_dns_requests == 0) | |
| 65 max_dns_requests = 20; | |
| 66 size_t max_pending_requests = max_dns_requests * 100; | |
| 67 DnsConfig config; | |
| 68 config.nameservers.push_back(IPEndPoint(dns_ip, 53)); | |
| 69 DnsSession* session = new DnsSession( | |
| 70 config, | |
| 71 ClientSocketFactory::GetDefaultFactory(), | |
| 72 base::Bind(&base::RandInt), | |
| 73 net_log); | |
| 74 HostResolver* resolver = new AsyncHostResolver( | |
| 75 max_dns_requests, | |
| 76 max_pending_requests, | |
| 77 HostCache::CreateDefaultCache(), | |
| 78 DnsTransactionFactory::CreateFactory(session), | |
| 79 net_log); | |
| 80 return resolver; | |
| 81 } | |
| 82 | |
| 83 //----------------------------------------------------------------------------- | |
| 84 // Every call to Resolve() results in Request object being created. Such a | |
| 85 // call may complete either synchronously or asynchronously or it may get | |
| 86 // cancelled, which can be either through specific CancelRequest call or by | |
| 87 // the destruction of AsyncHostResolver, which would destruct pending or | |
| 88 // in-progress requests, causing them to be cancelled. Synchronous | |
| 89 // resolution sets |callback_| to NULL, thus, if in the destructor we still | |
| 90 // have a non-NULL |callback_|, we are being cancelled. | |
| 91 class AsyncHostResolver::Request { | |
| 92 public: | |
| 93 Request(AsyncHostResolver* resolver, | |
| 94 const BoundNetLog& source_net_log, | |
| 95 const BoundNetLog& request_net_log, | |
| 96 const HostResolver::RequestInfo& info, | |
| 97 const CompletionCallback& callback, | |
| 98 AddressList* addresses) | |
| 99 : resolver_(resolver), | |
| 100 source_net_log_(source_net_log), | |
| 101 request_net_log_(request_net_log), | |
| 102 info_(info), | |
| 103 callback_(callback), | |
| 104 addresses_(addresses), | |
| 105 result_(ERR_UNEXPECTED) { | |
| 106 DCHECK(addresses_); | |
| 107 DCHECK(resolver_); | |
| 108 resolver_->OnStart(this); | |
| 109 key_ = Key(info.hostname(), | |
| 110 QueryTypeFromAddressFamily(info.address_family())); | |
| 111 } | |
| 112 | |
| 113 ~Request() { | |
| 114 if (!callback_.is_null()) | |
| 115 resolver_->OnCancel(this); | |
| 116 } | |
| 117 | |
| 118 int result() const { return result_; } | |
| 119 const Key& key() const { | |
| 120 DCHECK(IsValid()); | |
| 121 return key_; | |
| 122 } | |
| 123 const HostResolver::RequestInfo& info() const { return info_; } | |
| 124 RequestPriority priority() const { return info_.priority(); } | |
| 125 const BoundNetLog& source_net_log() const { return source_net_log_; } | |
| 126 const BoundNetLog& request_net_log() const { return request_net_log_; } | |
| 127 | |
| 128 bool ResolveAsIp() { | |
| 129 IPAddressNumber ip_number; | |
| 130 if (!ParseIPLiteralToNumber(info_.hostname(), &ip_number)) | |
| 131 return false; | |
| 132 | |
| 133 if (ip_number.size() != kIPv4AddressSize) { | |
| 134 result_ = ERR_NAME_NOT_RESOLVED; | |
| 135 } else { | |
| 136 *addresses_ = AddressList::CreateFromIPAddressWithCname( | |
| 137 ip_number, | |
| 138 info_.port(), | |
| 139 info_.host_resolver_flags() & HOST_RESOLVER_CANONNAME); | |
| 140 result_ = OK; | |
| 141 } | |
| 142 return true; | |
| 143 } | |
| 144 | |
| 145 bool ServeFromCache() { | |
| 146 HostCache* cache = resolver_->cache_.get(); | |
| 147 if (!cache || !info_.allow_cached_response()) | |
| 148 return false; | |
| 149 | |
| 150 HostCache::Key key(info_.hostname(), info_.address_family(), | |
| 151 info_.host_resolver_flags()); | |
| 152 const HostCache::Entry* cache_entry = cache->Lookup( | |
| 153 key, base::TimeTicks::Now()); | |
| 154 if (cache_entry) { | |
| 155 request_net_log_.AddEvent( | |
| 156 NetLog::TYPE_ASYNC_HOST_RESOLVER_CACHE_HIT, NULL); | |
| 157 DCHECK_EQ(OK, cache_entry->error); | |
| 158 result_ = cache_entry->error; | |
| 159 *addresses_ = | |
| 160 CreateAddressListUsingPort(cache_entry->addrlist, info_.port()); | |
| 161 return true; | |
| 162 } | |
| 163 return false; | |
| 164 } | |
| 165 | |
| 166 // Called when a request completes synchronously; we do not have an | |
| 167 // AddressList argument, since in case of a successful synchronous | |
| 168 // completion, either ResolveAsIp or ServerFromCache would set the | |
| 169 // |addresses_| and in case of an unsuccessful synchronous completion, we | |
| 170 // do not touch |addresses_|. | |
| 171 void OnSyncComplete(int result) { | |
| 172 callback_.Reset(); | |
| 173 resolver_->OnFinish(this, result); | |
| 174 } | |
| 175 | |
| 176 // Called when a request completes asynchronously. | |
| 177 void OnAsyncComplete(int result, const AddressList& addresses) { | |
| 178 if (result == OK) | |
| 179 *addresses_ = CreateAddressListUsingPort(addresses, info_.port()); | |
| 180 DCHECK_EQ(false, callback_.is_null()); | |
| 181 CompletionCallback callback = callback_; | |
| 182 callback_.Reset(); | |
| 183 resolver_->OnFinish(this, result); | |
| 184 callback.Run(result); | |
| 185 } | |
| 186 | |
| 187 // Returns true if request has a validly formed hostname. | |
| 188 bool IsValid() const { | |
| 189 return !info_.hostname().empty() && !key_.first.empty(); | |
| 190 } | |
| 191 | |
| 192 private: | |
| 193 AsyncHostResolver* resolver_; | |
| 194 BoundNetLog source_net_log_; | |
| 195 BoundNetLog request_net_log_; | |
| 196 const HostResolver::RequestInfo info_; | |
| 197 Key key_; | |
| 198 CompletionCallback callback_; | |
| 199 AddressList* addresses_; | |
| 200 int result_; | |
| 201 }; | |
| 202 | |
| 203 //----------------------------------------------------------------------------- | |
| 204 AsyncHostResolver::AsyncHostResolver(size_t max_dns_requests, | |
| 205 size_t max_pending_requests, | |
| 206 HostCache* cache, | |
| 207 scoped_ptr<DnsTransactionFactory> client, | |
| 208 NetLog* net_log) | |
| 209 : max_dns_transactions_(max_dns_requests), | |
| 210 max_pending_requests_(max_pending_requests), | |
| 211 cache_(cache), | |
| 212 client_(client.Pass()), | |
| 213 net_log_(net_log) { | |
| 214 } | |
| 215 | |
| 216 AsyncHostResolver::~AsyncHostResolver() { | |
| 217 // Destroy request lists. | |
| 218 for (KeyRequestListMap::iterator it = requestlist_map_.begin(); | |
| 219 it != requestlist_map_.end(); ++it) | |
| 220 STLDeleteElements(&it->second); | |
| 221 | |
| 222 // Destroy DNS transactions. | |
| 223 STLDeleteElements(&dns_transactions_); | |
| 224 | |
| 225 // Destroy pending requests. | |
| 226 for (size_t i = 0; i < arraysize(pending_requests_); ++i) | |
| 227 STLDeleteElements(&pending_requests_[i]); | |
| 228 } | |
| 229 | |
| 230 int AsyncHostResolver::Resolve(const RequestInfo& info, | |
| 231 AddressList* addresses, | |
| 232 const CompletionCallback& callback, | |
| 233 RequestHandle* out_req, | |
| 234 const BoundNetLog& source_net_log) { | |
| 235 DCHECK(addresses); | |
| 236 DCHECK_EQ(false, callback.is_null()); | |
| 237 scoped_ptr<Request> request( | |
| 238 CreateNewRequest(info, callback, addresses, source_net_log)); | |
| 239 | |
| 240 int rv = ERR_UNEXPECTED; | |
| 241 if (!request->IsValid()) | |
| 242 rv = ERR_NAME_NOT_RESOLVED; | |
| 243 else if (request->ResolveAsIp() || request->ServeFromCache()) | |
| 244 rv = request->result(); | |
| 245 else if (AttachToRequestList(request.get())) | |
| 246 rv = ERR_IO_PENDING; | |
| 247 else if (dns_transactions_.size() < max_dns_transactions_) | |
| 248 rv = StartNewDnsRequestFor(request.get()); | |
| 249 else | |
| 250 rv = Enqueue(request.get()); | |
| 251 | |
| 252 if (rv != ERR_IO_PENDING) { | |
| 253 request->OnSyncComplete(rv); | |
| 254 } else { | |
| 255 Request* req = request.release(); | |
| 256 if (out_req) | |
| 257 *out_req = reinterpret_cast<RequestHandle>(req); | |
| 258 } | |
| 259 return rv; | |
| 260 } | |
| 261 | |
| 262 int AsyncHostResolver::ResolveFromCache(const RequestInfo& info, | |
| 263 AddressList* addresses, | |
| 264 const BoundNetLog& source_net_log) { | |
| 265 scoped_ptr<Request> request( | |
| 266 CreateNewRequest(info, CompletionCallback(), addresses, source_net_log)); | |
| 267 int rv = ERR_UNEXPECTED; | |
| 268 if (!request->IsValid()) | |
| 269 rv = ERR_NAME_NOT_RESOLVED; | |
| 270 else if (request->ResolveAsIp() || request->ServeFromCache()) | |
| 271 rv = request->result(); | |
| 272 else | |
| 273 rv = ERR_DNS_CACHE_MISS; | |
| 274 request->OnSyncComplete(rv); | |
| 275 return rv; | |
| 276 } | |
| 277 | |
| 278 void AsyncHostResolver::OnStart(Request* request) { | |
| 279 DCHECK(request); | |
| 280 | |
| 281 request->source_net_log().BeginEvent( | |
| 282 NetLog::TYPE_ASYNC_HOST_RESOLVER, | |
| 283 make_scoped_refptr(new NetLogSourceParameter( | |
| 284 "source_dependency", request->request_net_log().source()))); | |
| 285 request->request_net_log().BeginEvent( | |
| 286 NetLog::TYPE_ASYNC_HOST_RESOLVER_REQUEST, | |
| 287 make_scoped_refptr(new RequestParameters( | |
| 288 request->info(), request->source_net_log().source()))); | |
| 289 } | |
| 290 | |
| 291 void AsyncHostResolver::OnFinish(Request* request, int result) { | |
| 292 DCHECK(request); | |
| 293 request->request_net_log().EndEventWithNetErrorCode( | |
| 294 NetLog::TYPE_ASYNC_HOST_RESOLVER_REQUEST, result); | |
| 295 request->source_net_log().EndEvent( | |
| 296 NetLog::TYPE_ASYNC_HOST_RESOLVER, NULL); | |
| 297 } | |
| 298 | |
| 299 void AsyncHostResolver::OnCancel(Request* request) { | |
| 300 DCHECK(request); | |
| 301 | |
| 302 request->request_net_log().AddEvent( | |
| 303 NetLog::TYPE_CANCELLED, NULL); | |
| 304 request->request_net_log().EndEvent( | |
| 305 NetLog::TYPE_ASYNC_HOST_RESOLVER_REQUEST, NULL); | |
| 306 request->source_net_log().EndEvent( | |
| 307 NetLog::TYPE_ASYNC_HOST_RESOLVER, NULL); | |
| 308 } | |
| 309 | |
| 310 void AsyncHostResolver::CancelRequest(RequestHandle req_handle) { | |
| 311 scoped_ptr<Request> request(reinterpret_cast<Request*>(req_handle)); | |
| 312 DCHECK(request.get()); | |
| 313 | |
| 314 KeyRequestListMap::iterator it = requestlist_map_.find(request->key()); | |
| 315 if (it != requestlist_map_.end()) | |
| 316 it->second.remove(request.get()); | |
| 317 else | |
| 318 pending_requests_[request->priority()].remove(request.get()); | |
| 319 } | |
| 320 | |
| 321 void AsyncHostResolver::SetDefaultAddressFamily( | |
| 322 AddressFamily address_family) { | |
| 323 NOTIMPLEMENTED(); | |
| 324 } | |
| 325 | |
| 326 AddressFamily AsyncHostResolver::GetDefaultAddressFamily() const { | |
| 327 return ADDRESS_FAMILY_IPV4; | |
| 328 } | |
| 329 | |
| 330 HostCache* AsyncHostResolver::GetHostCache() { | |
| 331 return cache_.get(); | |
| 332 } | |
| 333 | |
| 334 void AsyncHostResolver::OnDnsTransactionComplete( | |
| 335 DnsTransaction* transaction, | |
| 336 int result, | |
| 337 const DnsResponse* response) { | |
| 338 DCHECK(std::find(dns_transactions_.begin(), | |
| 339 dns_transactions_.end(), | |
| 340 transaction) != dns_transactions_.end()); | |
| 341 | |
| 342 // If by the time requests that caused |transaction| are cancelled, we do | |
| 343 // not have a port number to associate with the result, therefore, we | |
| 344 // assume the most common port, otherwise we use the port number of the | |
| 345 // first request. | |
| 346 KeyRequestListMap::iterator rit = requestlist_map_.find( | |
| 347 std::make_pair(transaction->GetHostname(), transaction->GetType())); | |
| 348 DCHECK(rit != requestlist_map_.end()); | |
| 349 RequestList& requests = rit->second; | |
| 350 int port = requests.empty() ? 80 : requests.front()->info().port(); | |
| 351 | |
| 352 // Extract AddressList and TTL out of DnsResponse. | |
| 353 AddressList addr_list; | |
| 354 uint32 ttl = kuint32max; | |
| 355 if (result == OK) { | |
| 356 IPAddressList ip_addresses; | |
| 357 DnsRecordParser parser = response->Parser(); | |
| 358 DnsResourceRecord record; | |
| 359 // TODO(szym): Add stricter checking of names, aliases and address lengths. | |
| 360 while (parser.ParseRecord(&record)) { | |
| 361 if (record.type == transaction->GetType() && | |
| 362 (record.rdata.size() == kIPv4AddressSize || | |
| 363 record.rdata.size() == kIPv6AddressSize)) { | |
| 364 ip_addresses.push_back(IPAddressNumber(record.rdata.begin(), | |
| 365 record.rdata.end())); | |
| 366 ttl = std::min(ttl, record.ttl); | |
| 367 } | |
| 368 } | |
| 369 if (!ip_addresses.empty()) | |
| 370 addr_list = AddressList::CreateFromIPAddressList(ip_addresses, port); | |
| 371 else | |
| 372 result = ERR_NAME_NOT_RESOLVED; | |
| 373 } | |
| 374 | |
| 375 // Run callback of every request that was depending on this DNS request, | |
| 376 // also notify observers. | |
| 377 for (RequestList::iterator it = requests.begin(); it != requests.end(); ++it) | |
| 378 (*it)->OnAsyncComplete(result, addr_list); | |
| 379 | |
| 380 // It is possible that the requests that caused |transaction| to be | |
| 381 // created are cancelled by the time |transaction| completes. In that | |
| 382 // case |requests| would be empty. We are knowingly throwing away the | |
| 383 // result of a DNS resolution in that case, because (a) if there are no | |
| 384 // requests, we do not have info to obtain a key from, (b) DnsTransaction | |
| 385 // does not have info(). | |
| 386 // TODO(szym): Should DnsTransaction ignore HostResolverFlags or use defaults? | |
| 387 if ((result == OK || result == ERR_NAME_NOT_RESOLVED) && cache_.get() && | |
| 388 !requests.empty()) { | |
| 389 Request* request = requests.front(); | |
| 390 HostResolver::RequestInfo info = request->info(); | |
| 391 HostCache::Key key( | |
| 392 info.hostname(), info.address_family(), info.host_resolver_flags()); | |
| 393 // Store negative results with TTL 0 to flush out the old entry. | |
| 394 cache_->Set(key, | |
| 395 result, | |
| 396 addr_list, | |
| 397 base::TimeTicks::Now(), | |
| 398 (result == OK) ? base::TimeDelta::FromSeconds(ttl) | |
| 399 : base::TimeDelta()); | |
| 400 } | |
| 401 | |
| 402 // Cleanup requests. | |
| 403 STLDeleteElements(&requests); | |
| 404 requestlist_map_.erase(rit); | |
| 405 | |
| 406 // Cleanup |transaction| and start a new one if there are pending requests. | |
| 407 dns_transactions_.remove(transaction); | |
| 408 delete transaction; | |
| 409 ProcessPending(); | |
| 410 } | |
| 411 | |
| 412 AsyncHostResolver::Request* AsyncHostResolver::CreateNewRequest( | |
| 413 const RequestInfo& info, | |
| 414 const CompletionCallback& callback, | |
| 415 AddressList* addresses, | |
| 416 const BoundNetLog& source_net_log) { | |
| 417 BoundNetLog request_net_log = BoundNetLog::Make(net_log_, | |
| 418 NetLog::SOURCE_ASYNC_HOST_RESOLVER_REQUEST); | |
| 419 return new Request( | |
| 420 this, source_net_log, request_net_log, info, callback, addresses); | |
| 421 } | |
| 422 | |
| 423 bool AsyncHostResolver::AttachToRequestList(Request* request) { | |
| 424 KeyRequestListMap::iterator it = requestlist_map_.find(request->key()); | |
| 425 if (it == requestlist_map_.end()) | |
| 426 return false; | |
| 427 it->second.push_back(request); | |
| 428 return true; | |
| 429 } | |
| 430 | |
| 431 int AsyncHostResolver::StartNewDnsRequestFor(Request* request) { | |
| 432 DCHECK(requestlist_map_.find(request->key()) == requestlist_map_.end()); | |
| 433 DCHECK(dns_transactions_.size() < max_dns_transactions_); | |
| 434 | |
| 435 request->request_net_log().AddEvent( | |
| 436 NetLog::TYPE_ASYNC_HOST_RESOLVER_CREATE_DNS_TRANSACTION, NULL); | |
| 437 | |
| 438 requestlist_map_[request->key()].push_back(request); | |
| 439 scoped_ptr<DnsTransaction> transaction(client_->CreateTransaction( | |
| 440 request->key().first, | |
| 441 request->key().second, | |
| 442 base::Bind(&AsyncHostResolver::OnDnsTransactionComplete, | |
| 443 base::Unretained(this)), | |
| 444 request->request_net_log())); | |
| 445 int rv = transaction->Start(); | |
| 446 if (rv == ERR_IO_PENDING) | |
| 447 dns_transactions_.push_back(transaction.release()); | |
| 448 return rv; | |
| 449 } | |
| 450 | |
| 451 int AsyncHostResolver::Enqueue(Request* request) { | |
| 452 Request* evicted_request = Insert(request); | |
| 453 int rv = ERR_HOST_RESOLVER_QUEUE_TOO_LARGE; | |
| 454 if (evicted_request == request) | |
| 455 return rv; | |
| 456 if (evicted_request != NULL) { | |
| 457 evicted_request->OnAsyncComplete(rv, AddressList()); | |
| 458 delete evicted_request; | |
| 459 } | |
| 460 return ERR_IO_PENDING; | |
| 461 } | |
| 462 | |
| 463 AsyncHostResolver::Request* AsyncHostResolver::Insert(Request* request) { | |
| 464 pending_requests_[request->priority()].push_back(request); | |
| 465 if (GetNumPending() > max_pending_requests_) { | |
| 466 Request* req = RemoveLowest(); | |
| 467 DCHECK(req); | |
| 468 return req; | |
| 469 } | |
| 470 return NULL; | |
| 471 } | |
| 472 | |
| 473 size_t AsyncHostResolver::GetNumPending() const { | |
| 474 size_t num_pending = 0; | |
| 475 for (size_t i = 0; i < arraysize(pending_requests_); ++i) | |
| 476 num_pending += pending_requests_[i].size(); | |
| 477 return num_pending; | |
| 478 } | |
| 479 | |
| 480 AsyncHostResolver::Request* AsyncHostResolver::RemoveLowest() { | |
| 481 for (int i = static_cast<int>(arraysize(pending_requests_)) - 1; | |
| 482 i >= 0; --i) { | |
| 483 RequestList& requests = pending_requests_[i]; | |
| 484 if (!requests.empty()) { | |
| 485 Request* request = requests.front(); | |
| 486 requests.pop_front(); | |
| 487 return request; | |
| 488 } | |
| 489 } | |
| 490 return NULL; | |
| 491 } | |
| 492 | |
| 493 AsyncHostResolver::Request* AsyncHostResolver::RemoveHighest() { | |
| 494 for (size_t i = 0; i < arraysize(pending_requests_) - 1; ++i) { | |
| 495 RequestList& requests = pending_requests_[i]; | |
| 496 if (!requests.empty()) { | |
| 497 Request* request = requests.front(); | |
| 498 requests.pop_front(); | |
| 499 return request; | |
| 500 } | |
| 501 } | |
| 502 return NULL; | |
| 503 } | |
| 504 | |
| 505 void AsyncHostResolver::ProcessPending() { | |
| 506 Request* request = RemoveHighest(); | |
| 507 if (!request) | |
| 508 return; | |
| 509 for (size_t i = 0; i < arraysize(pending_requests_); ++i) { | |
| 510 RequestList& requests = pending_requests_[i]; | |
| 511 RequestList::iterator it = requests.begin(); | |
| 512 while (it != requests.end()) { | |
| 513 if (request->key() == (*it)->key()) { | |
| 514 requestlist_map_[request->key()].push_back(*it); | |
| 515 it = requests.erase(it); | |
| 516 } else { | |
| 517 ++it; | |
| 518 } | |
| 519 } | |
| 520 } | |
| 521 StartNewDnsRequestFor(request); | |
| 522 } | |
| 523 | |
| 524 } // namespace net | |
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Chromium Code Reviews
Issue 9369045:
[net] HostResolverImpl + DnsTransaction + DnsConfigService = Asynchronous DNS ready for experiments. (Closed)
Base URL: svn://svn.chromium.org/chrome/trunk/src