зеркало из https://github.com/mozilla/gecko-dev.git
309 строки
12 KiB
C++
309 строки
12 KiB
C++
/* vim:set ts=4 sw=2 sts=2 et cin: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#ifndef nsHostResolver_h__
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#define nsHostResolver_h__
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#include "nscore.h"
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#include "prnetdb.h"
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#include "PLDHashTable.h"
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#include "mozilla/CondVar.h"
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#include "mozilla/DataMutex.h"
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#include "nsISupportsImpl.h"
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#include "nsIDNSListener.h"
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#include "nsTArray.h"
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#include "GetAddrInfo.h"
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#include "HostRecordQueue.h"
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#include "mozilla/net/DNS.h"
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#include "mozilla/net/DashboardTypes.h"
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#include "mozilla/Atomics.h"
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#include "mozilla/TimeStamp.h"
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#include "mozilla/UniquePtr.h"
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#include "nsHostRecord.h"
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#include "nsRefPtrHashtable.h"
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#include "nsIThreadPool.h"
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#include "mozilla/net/NetworkConnectivityService.h"
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#include "mozilla/net/DNSByTypeRecord.h"
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#include "mozilla/Maybe.h"
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namespace mozilla {
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namespace net {
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class TRR;
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class TRRQuery;
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} // namespace net
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} // namespace mozilla
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#define TRR_DISABLED(x) \
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(((x) == nsIDNSService::MODE_NATIVEONLY) || \
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((x) == nsIDNSService::MODE_TRROFF))
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extern mozilla::Atomic<bool, mozilla::Relaxed> gNativeIsLocalhost;
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#define MAX_RESOLVER_THREADS_FOR_ANY_PRIORITY 3
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#define MAX_RESOLVER_THREADS_FOR_HIGH_PRIORITY 5
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#define MAX_NON_PRIORITY_REQUESTS 150
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#define MAX_RESOLVER_THREADS \
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(MAX_RESOLVER_THREADS_FOR_ANY_PRIORITY + \
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MAX_RESOLVER_THREADS_FOR_HIGH_PRIORITY)
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class AHostResolver {
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public:
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AHostResolver() = default;
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virtual ~AHostResolver() = default;
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NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
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enum LookupStatus {
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LOOKUP_OK,
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LOOKUP_RESOLVEAGAIN,
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};
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virtual LookupStatus CompleteLookup(nsHostRecord*, nsresult,
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mozilla::net::AddrInfo*, bool pb,
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const nsACString& aOriginsuffix,
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mozilla::net::TRRSkippedReason aReason,
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mozilla::net::TRR*) = 0;
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virtual LookupStatus CompleteLookupByType(
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nsHostRecord*, nsresult, mozilla::net::TypeRecordResultType& aResult,
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uint32_t aTtl, bool pb) = 0;
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virtual nsresult GetHostRecord(const nsACString& host,
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const nsACString& aTrrServer, uint16_t type,
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uint16_t flags, uint16_t af, bool pb,
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const nsCString& originSuffix,
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nsHostRecord** result) {
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return NS_ERROR_FAILURE;
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}
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virtual nsresult TrrLookup_unlocked(nsHostRecord*,
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mozilla::net::TRR* pushedTRR = nullptr) {
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return NS_ERROR_FAILURE;
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}
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virtual void MaybeRenewHostRecord(nsHostRecord* aRec) {}
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};
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/**
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* nsHostResolver - an asynchronous host name resolver.
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*/
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class nsHostResolver : public nsISupports, public AHostResolver {
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using CondVar = mozilla::CondVar;
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using Mutex = mozilla::Mutex;
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public:
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NS_DECL_THREADSAFE_ISUPPORTS
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/**
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* creates an addref'd instance of a nsHostResolver object.
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*/
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static nsresult Create(uint32_t maxCacheEntries, // zero disables cache
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uint32_t defaultCacheEntryLifetime, // seconds
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uint32_t defaultGracePeriod, // seconds
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nsHostResolver** result);
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/**
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* Set (new) cache limits.
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*/
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void SetCacheLimits(uint32_t maxCacheEntries, // zero disables cache
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uint32_t defaultCacheEntryLifetime, // seconds
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uint32_t defaultGracePeriod); // seconds
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/**
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* puts the resolver in the shutdown state, which will cause any pending
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* callbacks to be detached. any future calls to ResolveHost will fail.
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*/
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void Shutdown();
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/**
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* resolve the given hostname and originAttributes asynchronously. the caller
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* can synthesize a synchronous host lookup using a lock and a cvar. as noted
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* above the callback will occur re-entrantly from an unspecified thread. the
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* host lookup cannot be canceled (cancelation can be layered above this by
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* having the callback implementation return without doing anything).
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*/
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nsresult ResolveHost(const nsACString& aHost, const nsACString& trrServer,
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uint16_t type,
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const mozilla::OriginAttributes& aOriginAttributes,
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uint16_t flags, uint16_t af,
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nsResolveHostCallback* callback);
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nsHostRecord* InitRecord(const nsHostKey& key);
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mozilla::net::NetworkConnectivityService* GetNCS() { return mNCS; }
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/**
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* return a resolved hard coded loopback dns record for the specified key
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*/
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already_AddRefed<nsHostRecord> InitLoopbackRecord(const nsHostKey& key,
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nsresult* aRv);
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/**
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* removes the specified callback from the nsHostRecord for the given
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* hostname, originAttributes, flags, and address family. these parameters
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* should correspond to the parameters passed to ResolveHost. this function
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* executes the callback if the callback is still pending with the given
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* status.
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*/
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void DetachCallback(const nsACString& hostname, const nsACString& trrServer,
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uint16_t type,
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const mozilla::OriginAttributes& aOriginAttributes,
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uint16_t flags, uint16_t af,
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nsResolveHostCallback* callback, nsresult status);
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/**
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* Cancels an async request associated with the hostname, originAttributes,
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* flags, address family and listener. Cancels first callback found which
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* matches these criteria. These parameters should correspond to the
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* parameters passed to ResolveHost. If this is the last callback associated
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* with the host record, it is removed from any request queues it might be on.
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*/
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void CancelAsyncRequest(const nsACString& host, const nsACString& trrServer,
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uint16_t type,
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const mozilla::OriginAttributes& aOriginAttributes,
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uint16_t flags, uint16_t af,
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nsIDNSListener* aListener, nsresult status);
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/**
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* values for the flags parameter passed to ResolveHost and DetachCallback
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* that may be bitwise OR'd together.
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*
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* NOTE: in this implementation, these flags correspond exactly in value
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* to the flags defined on nsIDNSService.
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*/
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enum {
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RES_BYPASS_CACHE = nsIDNSService::RESOLVE_BYPASS_CACHE,
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RES_CANON_NAME = nsIDNSService::RESOLVE_CANONICAL_NAME,
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RES_PRIORITY_MEDIUM = nsHostRecord::DNS_PRIORITY_MEDIUM,
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RES_PRIORITY_LOW = nsHostRecord::DNS_PRIORITY_LOW,
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RES_SPECULATE = nsIDNSService::RESOLVE_SPECULATE,
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// RES_DISABLE_IPV6 = nsIDNSService::RESOLVE_DISABLE_IPV6, // Not used
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RES_OFFLINE = nsIDNSService::RESOLVE_OFFLINE,
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// RES_DISABLE_IPv4 = nsIDNSService::RESOLVE_DISABLE_IPV4, // Not Used
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RES_ALLOW_NAME_COLLISION = nsIDNSService::RESOLVE_ALLOW_NAME_COLLISION,
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RES_DISABLE_TRR = nsIDNSService::RESOLVE_DISABLE_TRR,
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RES_REFRESH_CACHE = nsIDNSService::RESOLVE_REFRESH_CACHE,
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RES_IP_HINT = nsIDNSService::RESOLVE_IP_HINT
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};
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size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
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/**
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* Flush the DNS cache.
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*/
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void FlushCache(bool aTrrToo);
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LookupStatus CompleteLookup(nsHostRecord*, nsresult, mozilla::net::AddrInfo*,
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bool pb, const nsACString& aOriginsuffix,
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mozilla::net::TRRSkippedReason aReason,
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mozilla::net::TRR* aTRRRequest) override;
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LookupStatus CompleteLookupByType(nsHostRecord*, nsresult,
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mozilla::net::TypeRecordResultType& aResult,
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uint32_t aTtl, bool pb) override;
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nsresult GetHostRecord(const nsACString& host, const nsACString& trrServer,
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uint16_t type, uint16_t flags, uint16_t af, bool pb,
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const nsCString& originSuffix,
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nsHostRecord** result) override;
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nsresult TrrLookup_unlocked(nsHostRecord*,
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mozilla::net::TRR* pushedTRR = nullptr) override;
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static nsIDNSService::ResolverMode Mode();
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virtual void MaybeRenewHostRecord(nsHostRecord* aRec) override;
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private:
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explicit nsHostResolver(uint32_t maxCacheEntries,
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uint32_t defaultCacheEntryLifetime,
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uint32_t defaultGracePeriod);
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virtual ~nsHostResolver();
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LookupStatus CompleteLookupLocked(nsHostRecord*, nsresult,
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mozilla::net::AddrInfo*, bool pb,
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const nsACString& aOriginsuffix,
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mozilla::net::TRRSkippedReason aReason,
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mozilla::net::TRR* aTRRRequest,
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const mozilla::MutexAutoLock& aLock);
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LookupStatus CompleteLookupByTypeLocked(
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nsHostRecord*, nsresult, mozilla::net::TypeRecordResultType& aResult,
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uint32_t aTtl, bool pb, const mozilla::MutexAutoLock& aLock);
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nsresult Init();
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static void ComputeEffectiveTRRMode(nsHostRecord* aRec);
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nsresult NativeLookup(nsHostRecord* aRec,
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const mozilla::MutexAutoLock& aLock);
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nsresult TrrLookup(nsHostRecord*, const mozilla::MutexAutoLock& aLock,
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mozilla::net::TRR* pushedTRR = nullptr);
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// Kick-off a name resolve operation, using native resolver and/or TRR
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nsresult NameLookup(nsHostRecord* aRec, const mozilla::MutexAutoLock& aLock);
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bool GetHostToLookup(AddrHostRecord** result);
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void MaybeRenewHostRecordLocked(nsHostRecord* aRec,
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const mozilla::MutexAutoLock& aLock);
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// Cancels host records in the pending queue and also
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// calls CompleteLookup with the NS_ERROR_ABORT result code.
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void ClearPendingQueue(mozilla::LinkedList<RefPtr<nsHostRecord>>& aPendingQ);
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nsresult ConditionallyCreateThread(nsHostRecord* rec);
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/**
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* Starts a new lookup in the background for entries that are in the grace
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* period with a failed connect or all cached entries are negative.
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*/
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nsresult ConditionallyRefreshRecord(nsHostRecord* rec, const nsACString& host,
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const mozilla::MutexAutoLock& aLock);
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void AddToEvictionQ(nsHostRecord* rec, const mozilla::MutexAutoLock& aLock);
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void ThreadFunc();
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// Resolve the host from the DNS cache.
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already_AddRefed<nsHostRecord> FromCache(nsHostRecord* aRec,
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const nsACString& aHost,
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uint16_t aType, nsresult& aStatus,
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const mozilla::MutexAutoLock& aLock);
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// Called when the host name is an IP address and has been passed.
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already_AddRefed<nsHostRecord> FromCachedIPLiteral(nsHostRecord* aRec);
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// Like the above function, but the host name is not parsed to NetAddr yet.
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already_AddRefed<nsHostRecord> FromIPLiteral(
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AddrHostRecord* aAddrRec, const mozilla::net::NetAddr& aAddr);
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// Called to check if we have an AF_UNSPEC entry in the cache.
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already_AddRefed<nsHostRecord> FromUnspecEntry(
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nsHostRecord* aRec, const nsACString& aHost, const nsACString& aTrrServer,
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const nsACString& aOriginSuffix, uint16_t aType, uint16_t aFlags,
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uint16_t af, bool aPb, nsresult& aStatus);
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enum {
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METHOD_HIT = 1,
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METHOD_RENEWAL = 2,
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METHOD_NEGATIVE_HIT = 3,
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METHOD_LITERAL = 4,
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METHOD_OVERFLOW = 5,
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METHOD_NETWORK_FIRST = 6,
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METHOD_NETWORK_SHARED = 7
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};
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uint32_t mMaxCacheEntries = 0;
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uint32_t mDefaultCacheLifetime = 0; // granularity seconds
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uint32_t mDefaultGracePeriod = 0; // granularity seconds
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// mutable so SizeOfIncludingThis can be const
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mutable Mutex mLock{"nsHostResolver.mLock"};
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CondVar mIdleTaskCV;
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nsRefPtrHashtable<nsGenericHashKey<nsHostKey>, nsHostRecord> mRecordDB;
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PRTime mCreationTime;
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mozilla::TimeDuration mLongIdleTimeout;
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mozilla::TimeDuration mShortIdleTimeout;
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RefPtr<nsIThreadPool> mResolverThreads;
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RefPtr<mozilla::net::NetworkConnectivityService> mNCS;
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mozilla::net::HostRecordQueue mQueue;
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mozilla::Atomic<bool> mShutdown{true};
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mozilla::Atomic<uint32_t> mNumIdleTasks{0};
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mozilla::Atomic<uint32_t> mActiveTaskCount{0};
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mozilla::Atomic<uint32_t> mActiveAnyThreadCount{0};
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// Set the expiration time stamps appropriately.
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void PrepareRecordExpirationAddrRecord(AddrHostRecord* rec) const;
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public:
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/*
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* Called by the networking dashboard via the DnsService2
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*/
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void GetDNSCacheEntries(nsTArray<mozilla::net::DNSCacheEntries>*);
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};
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#endif // nsHostResolver_h__
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