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Diffstat (limited to 'netwerk/dns/TRRService.h')
| -rw-r--r-- | netwerk/dns/TRRService.h | 385 |
1 files changed, 385 insertions, 0 deletions
diff --git a/netwerk/dns/TRRService.h b/netwerk/dns/TRRService.h new file mode 100644 index 0000000000..eb6b87b58f --- /dev/null +++ b/netwerk/dns/TRRService.h @@ -0,0 +1,385 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* This Source Code Form is subject to the terms of the Mozilla Public + * License, v. 2.0. If a copy of the MPL was not distributed with this + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ + +#ifndef TRRService_h_ +#define TRRService_h_ + +#include "mozilla/DataMutex.h" +#include "nsHostResolver.h" +#include "nsIObserver.h" +#include "nsITimer.h" +#include "nsWeakReference.h" +#include "TRRServiceBase.h" +#include "nsICaptivePortalService.h" +#include "nsTHashSet.h" +#include "TRR.h" + +class nsDNSService; +class nsIPrefBranch; +class nsINetworkLinkService; +class nsIObserverService; + +namespace mozilla { +namespace net { + +class TRRServiceChild; +class TRRServiceParent; + +class TRRService : public TRRServiceBase, + public nsIObserver, + public nsSupportsWeakReference, + public AHostResolver, + public SingleWriterLockOwner { + public: + NS_DECL_ISUPPORTS_INHERITED + NS_DECL_NSIOBSERVER + NS_DECL_NSIPROXYCONFIGCHANGEDCALLBACK + + TRRService(); + static TRRService* Get(); + + bool OnWritingThread() const override { return NS_IsMainThread(); } + + nsresult Init(); + nsresult Start(); + bool Enabled(nsIRequest::TRRMode aRequestMode = nsIRequest::TRR_DEFAULT_MODE); + bool IsConfirmed() { return mConfirmation.State() == CONFIRM_OK; } + uint32_t ConfirmationState() { return mConfirmation.State(); } + + bool DisableIPv6() { return mDisableIPv6; } + void GetURI(nsACString& result) override; + nsresult GetCredentials(nsCString& result); + uint32_t GetRequestTimeout(); + void RetryTRRConfirm(); + + LookupStatus CompleteLookup(nsHostRecord*, nsresult, mozilla::net::AddrInfo*, + bool pb, const nsACString& aOriginSuffix, + TRRSkippedReason aReason, + TRR* aTrrRequest) override; + LookupStatus CompleteLookupByType(nsHostRecord*, nsresult, + mozilla::net::TypeRecordResultType&, + uint32_t, bool pb) override; + void AddToBlocklist(const nsACString& host, const nsACString& originSuffix, + bool privateBrowsing, bool aParentsToo); + bool IsTemporarilyBlocked(const nsACString& aHost, + const nsACString& aOriginSuffix, + bool aPrivateBrowsing, bool aParentsToo); + bool IsExcludedFromTRR(const nsACString& aHost); + + bool MaybeBootstrap(const nsACString& possible, nsACString& result); + void RecordTRRStatus(TRR* aTrrRequest); + bool ParentalControlEnabled() const { return mParentalControlEnabled; } + + nsresult DispatchTRRRequest(TRR* aTrrRequest); + already_AddRefed<nsIThread> TRRThread(); + bool IsOnTRRThread(); + + bool IsUsingAutoDetectedURL() { return mURISetByDetection; } + + void SetHeuristicDetectionResult(TRRSkippedReason aValue) { + mHeuristicDetectionValue = aValue; + } + TRRSkippedReason GetHeuristicDetectionResult() { + return mHeuristicDetectionValue; + } + + nsresult LastConfirmationStatus() { + return mConfirmation.LastConfirmationStatus(); + } + TRRSkippedReason LastConfirmationSkipReason() { + return mConfirmation.LastConfirmationSkipReason(); + } + + // Returns a reference to a static string identifying the current DoH server + // If the DoH server is not one of the built-in ones it will return "(other)" + static const nsCString& ProviderKey(); + static void SetProviderDomain(const nsACString& aTRRDomain); + // Only called when TRR mode changed. + static void SetCurrentTRRMode(nsIDNSService::ResolverMode aMode); + + void InitTRRConnectionInfo() override; + + void DontUseTRRThread() { mDontUseTRRThread = true; } + + private: + virtual ~TRRService(); + + friend class TRRServiceChild; + friend class TRRServiceParent; + static void AddObserver(nsIObserver* aObserver, + nsIObserverService* aObserverService = nullptr); + static bool CheckCaptivePortalIsPassed(); + static bool GetParentalControlEnabledInternal(); + static bool CheckPlatformDNSStatus(nsINetworkLinkService* aLinkService); + + nsresult ReadPrefs(const char* name); + void GetPrefBranch(nsIPrefBranch** result); + friend class ::nsDNSService; + void SetDetectedTrrURI(const nsACString& aURI); + + bool IsDomainBlocked(const nsACString& aHost, const nsACString& aOriginSuffix, + bool aPrivateBrowsing); + bool IsExcludedFromTRR_unlocked(const nsACString& aHost); + + void RebuildSuffixList(nsTArray<nsCString>&& aSuffixList); + + nsresult DispatchTRRRequestInternal(TRR* aTrrRequest, bool aWithLock); + already_AddRefed<nsIThread> TRRThread_locked(); + already_AddRefed<nsIThread> MainThreadOrTRRThread(bool aWithLock = true); + + // This method will process the URI and try to set mPrivateURI to that value. + // Will return true if performed the change (if the value was different) + // or false if mPrivateURI already had that value. + bool MaybeSetPrivateURI(const nsACString& aURI) override; + void ClearEntireCache(); + + virtual void ReadEtcHostsFile() override; + void AddEtcHosts(const nsTArray<nsCString>&); + + bool mInitialized{false}; + MutexSingleWriter mLock; + + nsCString mPrivateCred; // main thread only + nsCString mConfirmationNS MOZ_GUARDED_BY(mLock){"example.com"_ns}; + nsCString mBootstrapAddr MOZ_GUARDED_BY(mLock); + + Atomic<bool, Relaxed> mCaptiveIsPassed{ + false}; // set when captive portal check is passed + Atomic<bool, Relaxed> mDisableIPv6; // don't even try + Atomic<bool, Relaxed> mShutdown{false}; + Atomic<bool, Relaxed> mDontUseTRRThread{false}; + + // TRR Blocklist storage + // mTRRBLStorage is only modified on the main thread, but we query whether it + // is initialized or not off the main thread as well. Therefore we need to + // lock while creating it and while accessing it off the main thread. + DataMutex<nsTHashMap<nsCStringHashKey, int32_t>> mTRRBLStorage{ + "DataMutex::TRRBlocklist"}; + + // A set of domains that we should not use TRR for. + nsTHashSet<nsCString> mExcludedDomains MOZ_GUARDED_BY(mLock); + nsTHashSet<nsCString> mDNSSuffixDomains MOZ_GUARDED_BY(mLock); + nsTHashSet<nsCString> mEtcHostsDomains MOZ_GUARDED_BY(mLock); + + // The result of the TRR heuristic detection + TRRSkippedReason mHeuristicDetectionValue = nsITRRSkipReason::TRR_UNSET; + + enum class ConfirmationEvent { + Init, + PrefChange, + ConfirmationRetry, + FailedLookups, + RetryTRR, + URIChange, + CaptivePortalConnectivity, + NetworkUp, + ConfirmOK, + ConfirmFail, + }; + + // (FailedLookups/RetryTRR/URIChange/NetworkUp) + // +---------------------------+ + // +-----------+ | | + // | (Init) | +------v---------+ +-+--+ + // | | TRR turned on | | (ConfirmOK) | | + // | OFF +---------------> TRY-OK +---------------> OK | + // | | (PrefChange) | | | | + // +-----^-----+ +^-^----+--------+ +-^--+ + // | (PrefChange/CP) | | | | + // TRR + +------------------+ | | | + // off | | +----+ |(ConfirmFail) |(ConfirmOK) + // (Pref)| | | | | + // +---------+-+ | | | + // | | (CPConn) | +-------v--------+ +-+---------+ + // | ANY-STATE | (NetworkUp)| | | timer | | + // | | (URIChange)+-+ FAIL +---------------> TRY-FAIL | + // +-----+-----+ | | (Confirmation | | + // | +------^---------+ Retry) +------+----+ + // | (PrefChange) | | + // | TRR_ONLY mode or +--------------------------------+ + // | confirmationNS = skip (ConfirmFail) + // +-----v-----+ + // | | + // | DISABLED | + // | | + // +-----------+ + // + enum ConfirmationState { + CONFIRM_OFF = 0, + CONFIRM_TRYING_OK = 1, + CONFIRM_OK = 2, + CONFIRM_FAILED = 3, + CONFIRM_TRYING_FAILED = 4, + CONFIRM_DISABLED = 5, + }; + + class ConfirmationContext final : public nsITimerCallback, public nsINamed { + NS_DECL_ISUPPORTS_INHERITED + NS_DECL_NSITIMERCALLBACK + NS_DECL_NSINAMED + + private: + static const size_t RESULTS_SIZE = 32; + + RefPtr<TRR> mTask; + nsCOMPtr<nsITimer> mTimer; + uint32_t mRetryInterval = 125; // milliseconds until retry + // The number of TRR requests that failed in a row. + Atomic<uint32_t, Relaxed> mTRRFailures{0}; + + // This buffer holds consecutive TRR failures reported by calling + // RecordTRRStatus(). It is only meant for reporting event telemetry. + char mFailureReasons[RESULTS_SIZE] = {0}; + + // The number of confirmation retries. + uint32_t mAttemptCount = 0; + + // The results of past confirmation attempts. + // This is circular buffer ending at mAttemptCount. + char mResults[RESULTS_SIZE] = {0}; + + // Time when first confirmation started. Needed so we can + // record the time from start to confirmed. + TimeStamp mFirstRequestTime; + // The network ID at the start of the last confirmation attempt + nsCString mNetworkId; + // Captive portal status at the time of recording. + int32_t mCaptivePortalStatus = nsICaptivePortalService::UNKNOWN; + + // The reason the confirmation context changed. + nsCString mContextChangeReason; + + // What triggered the confirmation + nsCString mTrigger; + + // String representation of consecutive failed lookups that triggered + // confirmation. + nsCString mFailedLookups; + + Atomic<TRRSkippedReason, Relaxed> mLastConfirmationSkipReason{ + nsITRRSkipReason::TRR_UNSET}; + Atomic<nsresult, Relaxed> mLastConfirmationStatus{NS_OK}; + + void SetState(enum ConfirmationState aNewState); + + public: + // Called when a confirmation completes successfully or when the + // confirmation context changes. + void RecordEvent(const char* aReason, const MutexSingleWriterAutoLock&); + + // Called when a confirmation request is completed. The status is recorded + // in the results. + void RequestCompleted(nsresult aLookupStatus, nsresult aChannelStatus); + + enum ConfirmationState State() { return mState; } + + void CompleteConfirmation(nsresult aStatus, TRR* aTrrRequest); + + void RecordTRRStatus(TRR* aTrrRequest); + + // Returns true when handling the event caused a new confirmation task to be + // dispatched. + bool HandleEvent(ConfirmationEvent aEvent); + bool HandleEvent(ConfirmationEvent aEvent, + const MutexSingleWriterAutoLock&); + + void SetCaptivePortalStatus(int32_t aStatus) { + mCaptivePortalStatus = aStatus; + } + + TRRSkippedReason LastConfirmationSkipReason() { + return mLastConfirmationSkipReason; + } + nsresult LastConfirmationStatus() { return mLastConfirmationStatus; } + + uintptr_t TaskAddr() { return uintptr_t(mTask.get()); } + + private: + // Since the ConfirmationContext is embedded in the TRRService object + // we can easily get a pointer to the TRRService. ConfirmationContext + // delegates AddRef/Release calls to the owning object since they are + // guaranteed to have the same lifetime. + TRRService* OwningObject() { + return reinterpret_cast<TRRService*>( + reinterpret_cast<uint8_t*>(this) - + offsetof(TRRService, mConfirmation) - + offsetof(ConfirmationWrapper, mConfirmation)); + } + + Atomic<enum ConfirmationState, Relaxed> mState{CONFIRM_OFF}; + + // TRRService needs to be a friend class because it needs to access the + // destructor. + friend class TRRService; + ~ConfirmationContext() = default; + }; + + // Because TRRService needs to be a friend class to ConfirmationContext that + // means it can access member variables. In order to properly separate logic + // and prevent direct access to its member variables we embed it in a wrapper + // class. + class ConfirmationWrapper { + public: + // Called when a confirmation completes successfully or when the + // confirmation context changes. + void RecordEvent(const char* aReason, + const MutexSingleWriterAutoLock& aLock) { + mConfirmation.RecordEvent(aReason, aLock); + } + + // Called when a confirmation request is completed. The status is recorded + // in the results. + void RequestCompleted(nsresult aLookupStatus, nsresult aChannelStatus) { + mConfirmation.RequestCompleted(aLookupStatus, aChannelStatus); + } + + enum ConfirmationState State() { return mConfirmation.State(); } + + void CompleteConfirmation(nsresult aStatus, TRR* aTrrRequest) { + mConfirmation.CompleteConfirmation(aStatus, aTrrRequest); + } + + void RecordTRRStatus(TRR* aTrrRequest) { + mConfirmation.RecordTRRStatus(aTrrRequest); + } + + bool HandleEvent(ConfirmationEvent aEvent) { + return mConfirmation.HandleEvent(aEvent); + } + + bool HandleEvent(ConfirmationEvent aEvent, + const MutexSingleWriterAutoLock& lock) { + return mConfirmation.HandleEvent(aEvent, lock); + } + + void SetCaptivePortalStatus(int32_t aStatus) { + mConfirmation.SetCaptivePortalStatus(aStatus); + } + + TRRSkippedReason LastConfirmationSkipReason() { + return mConfirmation.LastConfirmationSkipReason(); + } + nsresult LastConfirmationStatus() { + return mConfirmation.LastConfirmationStatus(); + } + + private: + friend TRRService* ConfirmationContext::OwningObject(); + ConfirmationContext mConfirmation; + }; + + ConfirmationWrapper mConfirmation; + + bool mParentalControlEnabled{false}; + // This is used to track whether a confirmation was triggered by a URI change, + // so we don't trigger another one just because other prefs have changed. + bool mConfirmationTriggered{false}; + nsCOMPtr<nsINetworkLinkService> mLinkService; +}; + +} // namespace net +} // namespace mozilla + +#endif // TRRService_h_ |