15821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Copyright (c) 2012 The Chromium Authors. All rights reserved. 25821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Use of this source code is governed by a BSD-style license that can be 35821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// found in the LICENSE file. 45821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 52a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#ifndef NET_DNS_HOST_RESOLVER_IMPL_H_ 62a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#define NET_DNS_HOST_RESOLVER_IMPL_H_ 75821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 85821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include <map> 95821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/basictypes.h" 115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/gtest_prod_util.h" 125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/scoped_ptr.h" 135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/scoped_vector.h" 145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/memory/weak_ptr.h" 155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "base/threading/non_thread_safe.h" 16eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch#include "base/time/time.h" 175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "net/base/net_export.h" 185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)#include "net/base/network_change_notifier.h" 19c2e0dbddbe15c98d52c4786dac06cb8952a8ae6dTorne (Richard Coles)#include "net/dns/host_cache.h" 202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "net/dns/host_resolver.h" 212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#include "net/dns/host_resolver_proc.h" 225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)namespace net { 245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class BoundNetLog; 265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class DnsClient; 275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class NetLog; 285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// For each hostname that is requested, HostResolver creates a 305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// HostResolverImpl::Job. When this job gets dispatched it creates a ProcTask 315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// which runs the given HostResolverProc on a WorkerPool thread. If requests for 325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// that same host are made during the job's lifetime, they are attached to the 335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// existing job rather than creating a new one. This avoids doing parallel 345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// resolves for the same host. 355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The way these classes fit together is illustrated by: 375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 395821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// +----------- HostResolverImpl -------------+ 405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// | | | 415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Job Job Job 425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// (for host1, fam1) (for host2, fam2) (for hostx, famx) 435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// / | | / | | / | | 445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Request ... Request Request ... Request Request ... Request 455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// (port1) (port2) (port3) (port4) (port5) (portX) 465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// When a HostResolverImpl::Job finishes, the callbacks of each waiting request 485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// are run on the origin thread. 495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Thread safety: This class is not threadsafe, and must only be called 515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// from one thread! 525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// The HostResolverImpl enforces limits on the maximum number of concurrent 545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// threads using PrioritizedDispatcher::Limits. 555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// 565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)// Jobs are ordered in the queue based on their priority and order of arrival. 575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)class NET_EXPORT HostResolverImpl 585821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) : public HostResolver, 595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) NON_EXPORTED_BASE(public base::NonThreadSafe), 605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public NetworkChangeNotifier::IPAddressObserver, 615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public NetworkChangeNotifier::DNSObserver { 625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) public: 635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Parameters for ProcTask which resolves hostnames using HostResolveProc. 645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |resolver_proc| is used to perform the actual resolves; it must be 665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // thread-safe since it is run from multiple worker threads. If 675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |resolver_proc| is NULL then the default host resolver procedure is 685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // used (which is SystemHostResolverProc except if overridden). 695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // For each attempt, we could start another attempt if host is not resolved 715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // within |unresponsive_delay| time. We keep attempting to resolve the host 725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // for |max_retry_attempts|. For every retry attempt, we grow the 735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |unresponsive_delay| by the |retry_factor| amount (that is retry interval 745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // is multiplied by the retry factor each time). Once we have retried 755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |max_retry_attempts|, we give up on additional attempts. 765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) struct NET_EXPORT_PRIVATE ProcTaskParams { 785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Sets up defaults. 795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ProcTaskParams(HostResolverProc* resolver_proc, size_t max_retry_attempts); 805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ~ProcTaskParams(); 825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // The procedure to use for resolving host names. This will be NULL, except 845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // in the case of unit-tests which inject custom host resolving behaviors. 855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_refptr<HostResolverProc> resolver_proc; 865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Maximum number retry attempts to resolve the hostname. 885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Pass HostResolver::kDefaultRetryAttempts to choose a default value. 895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t max_retry_attempts; 905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // This is the limit after which we make another attempt to resolve the host 925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // if the worker thread has not responded yet. 935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::TimeDelta unresponsive_delay; 945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Factor to grow |unresponsive_delay| when we re-re-try. 965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) uint32 retry_factor; 975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) }; 985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 99f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // Creates a HostResolver as specified by |options|. 1005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 101f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // If Options.enable_caching is true, a cache is created using 102f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // HostCache::CreateDefaultCache(). Otherwise no cache is used. 1035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 104f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // Options.GetDispatcherLimits() determines the maximum number of jobs that 105f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // the resolver will run at once. This upper-bounds the total number of 106f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) // outstanding DNS transactions (not counting retransmissions and retries). 1075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // 1085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // |net_log| must remain valid for the life of the HostResolverImpl. 109f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) HostResolverImpl(const Options& options, NetLog* net_log); 1105821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If any completion callbacks are pending when the resolver is destroyed, 1125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // the host resolutions are cancelled, and the completion callbacks will not 1135821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // be called. 1145821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual ~HostResolverImpl(); 1155821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1165821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Configures maximum number of Jobs in the queue. Exposed for testing. 1175821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Only allowed when the queue is empty. 1185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void SetMaxQueuedJobs(size_t value); 1195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1202a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Set the DnsClient to be used for resolution. In case of failure, the 1212a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // HostResolverProc from ProcTaskParams will be queried. If the DnsClient is 1222a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // not pre-configured with a valid DnsConfig, a new config is fetched from 1232a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // NetworkChangeNotifier. 1242a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) void SetDnsClient(scoped_ptr<DnsClient> dns_client); 1252a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 1265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // HostResolver methods: 1275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual int Resolve(const RequestInfo& info, 1283551c9c881056c480085172ff9840cab31610854Torne (Richard Coles) RequestPriority priority, 1295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses, 1305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const CompletionCallback& callback, 1315821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) RequestHandle* out_req, 1325821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const BoundNetLog& source_net_log) OVERRIDE; 1335821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual int ResolveFromCache(const RequestInfo& info, 1345821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses, 1355821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const BoundNetLog& source_net_log) OVERRIDE; 1365821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void CancelRequest(RequestHandle req) OVERRIDE; 1375821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void SetDefaultAddressFamily(AddressFamily address_family) OVERRIDE; 1385821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual AddressFamily GetDefaultAddressFamily() const OVERRIDE; 1392a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) virtual void SetDnsClientEnabled(bool enabled) OVERRIDE; 1405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual HostCache* GetHostCache() OVERRIDE; 1415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual base::Value* GetDnsConfigAsValue() const OVERRIDE; 1425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 143f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) void set_proc_params_for_test(const ProcTaskParams& proc_params) { 144f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) proc_params_ = proc_params; 145f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) } 146f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) 1475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) private: 1485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) friend class HostResolverImplTest; 1495821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) class Job; 1505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) class ProcTask; 1515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) class LoopbackProbeJob; 1525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) class DnsTask; 1535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) class Request; 1545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typedef HostCache::Key Key; 1555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typedef std::map<Key, Job*> JobMap; 1565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) typedef ScopedVector<Request> RequestsList; 1575821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 15858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Number of consecutive failures of DnsTask (with successful fallback to 15958537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // ProcTask) before the DnsClient is disabled until the next DNS change. 16058537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) static const unsigned kMaximumDnsFailures; 16158537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 1625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Helper used by |Resolve()| and |ResolveFromCache()|. Performs IP 1635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // literal, cache and HOSTS lookup (if enabled), returns OK if successful, 1645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // ERR_NAME_NOT_RESOLVED if either hostname is invalid or IP literal is 1655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // incompatible, ERR_DNS_CACHE_MISS if entry was not found in cache and HOSTS. 1665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int ResolveHelper(const Key& key, 1675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const RequestInfo& info, 1685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses, 1695821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const BoundNetLog& request_net_log); 1705821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1715821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Tries to resolve |key| as an IP, returns true and sets |net_error| if 1725821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // succeeds, returns false otherwise. 1735821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ResolveAsIP(const Key& key, 1745821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const RequestInfo& info, 1755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int* net_error, 1765821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses); 1775821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1785821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If |key| is not found in cache returns false, otherwise returns 1795821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // true, sets |net_error| to the cached error code and fills |addresses| 1805821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // if it is a positive entry. 1815821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ServeFromCache(const Key& key, 1825821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const RequestInfo& info, 1835821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) int* net_error, 1845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses); 1855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If we have a DnsClient with a valid DnsConfig, and |key| is found in the 1875821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // HOSTS file, returns true and fills |addresses|. Otherwise returns false. 1885821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool ServeFromHosts(const Key& key, 1895821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const RequestInfo& info, 1905821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressList* addresses); 1915821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1925821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Callback from HaveOnlyLoopbackAddresses probe. 1935821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void SetHaveOnlyLoopbackAddresses(bool result); 1945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 1955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Returns the (hostname, address_family) key to use for |info|, choosing an 1965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // "effective" address family by inheriting the resolver's default address 1975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // family when the request leaves it unspecified. 198a3f7b4e666c476898878fa745f637129375cd889Ben Murdoch Key GetEffectiveKeyForRequest(const RequestInfo& info, 199a3f7b4e666c476898878fa745f637129375cd889Ben Murdoch const BoundNetLog& net_log) const; 2005821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2015821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Records the result in cache if cache is present. 2025821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void CacheResult(const Key& key, 2035821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) const HostCache::Entry& entry, 2045821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) base::TimeDelta ttl); 2055821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2065821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Removes |job| from |jobs_|, only if it exists. 2075821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void RemoveJob(Job* job); 2085821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2092a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Aborts all in progress jobs with ERR_NETWORK_CHANGED and notifies their 2102a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // requests. Might start new jobs. 2115821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void AbortAllInProgressJobs(); 2125821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 21358537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Aborts all in progress DnsTasks. In-progress jobs will fall back to 21458537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // ProcTasks. Might start new jobs, if any jobs were taking up two dispatcher 21558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // slots. 21658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) void AbortDnsTasks(); 21758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) 2185821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Attempts to serve each Job in |jobs_| from the HOSTS file if we have 2195821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // a DnsClient with a valid DnsConfig. 2205821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) void TryServingAllJobsFromHosts(); 2215821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2225821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // NetworkChangeNotifier::IPAddressObserver: 2235821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnIPAddressChanged() OVERRIDE; 2245821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2255821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // NetworkChangeNotifier::DNSObserver: 2265821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) virtual void OnDNSChanged() OVERRIDE; 2275821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2285821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // True if have a DnsClient with a valid DnsConfig. 2295821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool HaveDnsConfig() const; 2305821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2312a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Called when a host name is successfully resolved and DnsTask was run on it 2322a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // and resulted in |net_error|. 2332a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) void OnDnsTaskResolve(int net_error); 2342a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 23558537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // Allows the tests to catch slots leaking out of the dispatcher. One 23658537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // HostResolverImpl::Job could occupy multiple PrioritizedDispatcher job 23758537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) // slots. 23858537e28ecd584eab876aee8be7156509866d23aTorne (Richard Coles) size_t num_running_dispatcher_jobs_for_tests() const { 239f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) return dispatcher_->num_running_jobs(); 2405821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) } 2415821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2425821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Cache of host resolution results. 2435821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_ptr<HostCache> cache_; 2445821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2455821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Map from HostCache::Key to a Job. 2465821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) JobMap jobs_; 2475821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2485821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Starts Jobs according to their priority and the configured limits. 249f8ee788a64d60abd8f2d742a5fdedde054ecd910Torne (Richard Coles) scoped_ptr<PrioritizedDispatcher> dispatcher_; 2505821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2515821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Limit on the maximum number of jobs queued in |dispatcher_|. 2525821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) size_t max_queued_jobs_; 2535821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2545821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Parameters for ProcTask. 2555821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) ProcTaskParams proc_params_; 2565821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2572a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) NetLog* net_log_; 2582a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2595821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Address family to use when the request doesn't specify one. 2605821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) AddressFamily default_address_family_; 2615821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2625821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // If present, used by DnsTask and ServeFromHosts to resolve requests. 2635821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) scoped_ptr<DnsClient> dns_client_; 2645821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2655821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // True if received valid config from |dns_config_service_|. Temporary, used 2665821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // to measure performance of DnsConfigService: http://crbug.com/125599 2675821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) bool received_dns_config_; 2685821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2692a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // Number of consecutive failures of DnsTask, counted when fallback succeeds. 2702a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) unsigned num_dns_failures_; 2712a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2729ab5563a3196760eb381d102cbb2bc0f7abc6a50Ben Murdoch // True if probing is done for each Request to set address family. When false, 2739ab5563a3196760eb381d102cbb2bc0f7abc6a50Ben Murdoch // explicit setting in |default_address_family_| is used. 2749ab5563a3196760eb381d102cbb2bc0f7abc6a50Ben Murdoch bool probe_ipv6_support_; 2755821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 276d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) // True if DnsConfigService detected that system configuration depends on 277d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) // local IPv6 connectivity. Disables probing. 278d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) bool use_local_ipv6_; 279d0247b1b59f9c528cb6df88b4f2b9afaf80d181eTorne (Richard Coles) 2802a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // True iff ProcTask has successfully resolved a hostname known to have IPv6 2812a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) // addresses using ADDRESS_FAMILY_UNSPECIFIED. Reset on IP address change. 2822a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) bool resolved_known_ipv6_hostname_; 2832a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles) 2845821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) // Any resolver flags that should be added to a request by default. 2855821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) HostResolverFlags additional_resolver_flags_; 2865821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 287eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch // Allow fallback to ProcTask if DnsTask fails. 288eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch bool fallback_to_proctask_; 289eb525c5499e34cc9c4b825d6d9e75bb07cc06aceBen Murdoch 290cedac228d2dd51db4b79ea1e72c7f249408ee061Torne (Richard Coles) base::WeakPtrFactory<HostResolverImpl> weak_ptr_factory_; 291cedac228d2dd51db4b79ea1e72c7f249408ee061Torne (Richard Coles) 292cedac228d2dd51db4b79ea1e72c7f249408ee061Torne (Richard Coles) base::WeakPtrFactory<HostResolverImpl> probe_weak_ptr_factory_; 293cedac228d2dd51db4b79ea1e72c7f249408ee061Torne (Richard Coles) 2945821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) DISALLOW_COPY_AND_ASSIGN(HostResolverImpl); 2955821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)}; 2965821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2975821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles)} // namespace net 2985821806d5e7f356e8fa4b058a389a808ea183019Torne (Richard Coles) 2992a99a7e74a7f215066514fe81d2bfa6639d9edddTorne (Richard Coles)#endif // NET_DNS_HOST_RESOLVER_IMPL_H_ 300