Adding upstream version 1:115.7.0.upstream/1%115.7.0upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 339 insertions, 0 deletions

diff --git a/netwerk/dns/nsHostResolver.h b/netwerk/dns/nsHostResolver.h
new file mode 100644
index 0000000000..0f20917f01
--- /dev/null
+++ b/netwerk/dns/nsHostResolver.h
@@ -0,0 +1,339 @@
+/* vim:set ts=4 sw=2 sts=2 et cin: */
+/* 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 nsHostResolver_h__
+#define nsHostResolver_h__
+
+#include "nscore.h"
+#include "prnetdb.h"
+#include "PLDHashTable.h"
+#include "mozilla/CondVar.h"
+#include "mozilla/DataMutex.h"
+#include "nsISupportsImpl.h"
+#include "nsIDNSListener.h"
+#include "nsTArray.h"
+#include "GetAddrInfo.h"
+#include "HostRecordQueue.h"
+#include "mozilla/net/DNS.h"
+#include "mozilla/net/DashboardTypes.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/UniquePtr.h"
+#include "nsHostRecord.h"
+#include "nsRefPtrHashtable.h"
+#include "nsIThreadPool.h"
+#include "mozilla/net/NetworkConnectivityService.h"
+#include "mozilla/net/DNSByTypeRecord.h"
+#include "mozilla/Maybe.h"
+#include "mozilla/StaticPrefs_network.h"
+
+namespace mozilla {
+namespace net {
+class TRR;
+class TRRQuery;
+
+static inline uint32_t MaxResolverThreadsAnyPriority() {
+  return StaticPrefs::network_dns_max_any_priority_threads();
+}
+
+static inline uint32_t MaxResolverThreadsHighPriority() {
+  return StaticPrefs::network_dns_max_high_priority_threads();
+}
+
+static inline uint32_t MaxResolverThreads() {
+  return MaxResolverThreadsAnyPriority() + MaxResolverThreadsHighPriority();
+}
+
+}  // namespace net
+}  // namespace mozilla
+
+#define TRR_DISABLED(x)                       \
+  (((x) == nsIDNSService::MODE_NATIVEONLY) || \
+   ((x) == nsIDNSService::MODE_TRROFF))
+
+extern mozilla::Atomic<bool, mozilla::Relaxed> gNativeIsLocalhost;
+
+#define MAX_NON_PRIORITY_REQUESTS 150
+
+class AHostResolver {
+ public:
+  AHostResolver() = default;
+  virtual ~AHostResolver() = default;
+  NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
+
+  enum LookupStatus {
+    LOOKUP_OK,
+    LOOKUP_RESOLVEAGAIN,
+  };
+
+  virtual LookupStatus CompleteLookup(nsHostRecord*, nsresult,
+                                      mozilla::net::AddrInfo*, bool pb,
+                                      const nsACString& aOriginsuffix,
+                                      mozilla::net::TRRSkippedReason aReason,
+                                      mozilla::net::TRR*) = 0;
+  virtual LookupStatus CompleteLookupByType(
+      nsHostRecord*, nsresult, mozilla::net::TypeRecordResultType& aResult,
+      uint32_t aTtl, bool pb) = 0;
+  virtual nsresult GetHostRecord(const nsACString& host,
+                                 const nsACString& aTrrServer, uint16_t type,
+                                 nsIDNSService::DNSFlags flags, uint16_t af,
+                                 bool pb, const nsCString& originSuffix,
+                                 nsHostRecord** result) {
+    return NS_ERROR_FAILURE;
+  }
+  virtual nsresult TrrLookup_unlocked(nsHostRecord*,
+                                      mozilla::net::TRR* pushedTRR = nullptr) {
+    return NS_ERROR_FAILURE;
+  }
+  virtual void MaybeRenewHostRecord(nsHostRecord* aRec) {}
+};
+
+/**
+ * nsHostResolver - an asynchronous host name resolver.
+ */
+class nsHostResolver : public nsISupports, public AHostResolver {
+  using CondVar = mozilla::CondVar;
+  using Mutex = mozilla::Mutex;
+
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+
+  /**
+   * creates an addref'd instance of a nsHostResolver object.
+   */
+  static nsresult Create(uint32_t maxCacheEntries,  // zero disables cache
+                         uint32_t defaultCacheEntryLifetime,  // seconds
+                         uint32_t defaultGracePeriod,         // seconds
+                         nsHostResolver** result);
+
+  /**
+   * Set (new) cache limits.
+   */
+  void SetCacheLimits(uint32_t maxCacheEntries,  // zero disables cache
+                      uint32_t defaultCacheEntryLifetime,  // seconds
+                      uint32_t defaultGracePeriod);        // seconds
+
+  /**
+   * puts the resolver in the shutdown state, which will cause any pending
+   * callbacks to be detached.  any future calls to ResolveHost will fail.
+   */
+  void Shutdown();
+
+  /**
+   * resolve the given hostname and originAttributes asynchronously.  the caller
+   * can synthesize a synchronous host lookup using a lock and a cvar.  as noted
+   * above the callback will occur re-entrantly from an unspecified thread.  the
+   * host lookup cannot be canceled (cancelation can be layered above this by
+   * having the callback implementation return without doing anything).
+   */
+  nsresult ResolveHost(const nsACString& aHost, const nsACString& trrServer,
+                       int32_t aPort, uint16_t type,
+                       const mozilla::OriginAttributes& aOriginAttributes,
+                       nsIDNSService::DNSFlags flags, uint16_t af,
+                       nsResolveHostCallback* callback);
+
+  nsHostRecord* InitRecord(const nsHostKey& key);
+  mozilla::net::NetworkConnectivityService* GetNCS() {
+    return mNCS;
+  }  // This is actually a singleton
+
+  /**
+   * return a resolved hard coded loopback dns record for the specified key
+   */
+  already_AddRefed<nsHostRecord> InitLoopbackRecord(const nsHostKey& key,
+                                                    nsresult* aRv);
+
+  /**
+   * removes the specified callback from the nsHostRecord for the given
+   * hostname, originAttributes, flags, and address family.  these parameters
+   * should correspond to the parameters passed to ResolveHost.  this function
+   * executes the callback if the callback is still pending with the given
+   * status.
+   */
+  void DetachCallback(const nsACString& hostname, const nsACString& trrServer,
+                      uint16_t type,
+                      const mozilla::OriginAttributes& aOriginAttributes,
+                      nsIDNSService::DNSFlags flags, uint16_t af,
+                      nsResolveHostCallback* callback, nsresult status);
+
+  /**
+   * Cancels an async request associated with the hostname, originAttributes,
+   * flags, address family and listener.  Cancels first callback found which
+   * matches these criteria.  These parameters should correspond to the
+   * parameters passed to ResolveHost.  If this is the last callback associated
+   * with the host record, it is removed from any request queues it might be on.
+   */
+  void CancelAsyncRequest(const nsACString& host, const nsACString& trrServer,
+                          uint16_t type,
+                          const mozilla::OriginAttributes& aOriginAttributes,
+                          nsIDNSService::DNSFlags flags, uint16_t af,
+                          nsIDNSListener* aListener, nsresult status);
+  /**
+   * values for the flags parameter passed to ResolveHost and DetachCallback
+   * that may be bitwise OR'd together.
+   *
+   * NOTE: in this implementation, these flags correspond exactly in value
+   *       to the flags defined on nsIDNSService.
+   */
+  enum {
+    RES_BYPASS_CACHE = nsIDNSService::RESOLVE_BYPASS_CACHE,
+    RES_CANON_NAME = nsIDNSService::RESOLVE_CANONICAL_NAME,
+    RES_PRIORITY_MEDIUM = nsHostRecord::DNS_PRIORITY_MEDIUM,
+    RES_PRIORITY_LOW = nsHostRecord::DNS_PRIORITY_LOW,
+    RES_SPECULATE = nsIDNSService::RESOLVE_SPECULATE,
+    // RES_DISABLE_IPV6 = nsIDNSService::RESOLVE_DISABLE_IPV6, // Not used
+    RES_OFFLINE = nsIDNSService::RESOLVE_OFFLINE,
+    // RES_DISABLE_IPv4 = nsIDNSService::RESOLVE_DISABLE_IPV4, // Not Used
+    RES_ALLOW_NAME_COLLISION = nsIDNSService::RESOLVE_ALLOW_NAME_COLLISION,
+    RES_DISABLE_TRR = nsIDNSService::RESOLVE_DISABLE_TRR,
+    RES_REFRESH_CACHE = nsIDNSService::RESOLVE_REFRESH_CACHE,
+    RES_IP_HINT = nsIDNSService::RESOLVE_IP_HINT
+  };
+
+  size_t SizeOfIncludingThis(mozilla::MallocSizeOf mallocSizeOf) const;
+
+  /**
+   * Flush the DNS cache.
+   */
+  void FlushCache(bool aTrrToo);
+
+  LookupStatus CompleteLookup(nsHostRecord*, nsresult, mozilla::net::AddrInfo*,
+                              bool pb, const nsACString& aOriginsuffix,
+                              mozilla::net::TRRSkippedReason aReason,
+                              mozilla::net::TRR* aTRRRequest) override;
+  LookupStatus CompleteLookupByType(nsHostRecord*, nsresult,
+                                    mozilla::net::TypeRecordResultType& aResult,
+                                    uint32_t aTtl, bool pb) override;
+  nsresult GetHostRecord(const nsACString& host, const nsACString& trrServer,
+                         uint16_t type, nsIDNSService::DNSFlags flags,
+                         uint16_t af, bool pb, const nsCString& originSuffix,
+                         nsHostRecord** result) override;
+  nsresult TrrLookup_unlocked(nsHostRecord*,
+                              mozilla::net::TRR* pushedTRR = nullptr) override;
+  static nsIDNSService::ResolverMode Mode();
+
+  virtual void MaybeRenewHostRecord(nsHostRecord* aRec) override;
+
+  // Records true if the TRR service is enabled for the record's effective
+  // TRR mode. Also records the TRRSkipReason when the TRR service is not
+  // available/enabled.
+  bool TRRServiceEnabledForRecord(nsHostRecord* aRec) MOZ_REQUIRES(mLock);
+
+ private:
+  explicit nsHostResolver(uint32_t maxCacheEntries,
+                          uint32_t defaultCacheEntryLifetime,
+                          uint32_t defaultGracePeriod);
+  virtual ~nsHostResolver();
+
+  bool DoRetryTRR(AddrHostRecord* aAddrRec,
+                  const mozilla::MutexAutoLock& aLock);
+  bool MaybeRetryTRRLookup(
+      AddrHostRecord* aAddrRec, nsresult aFirstAttemptStatus,
+      mozilla::net::TRRSkippedReason aFirstAttemptSkipReason,
+      nsresult aChannelStatus, const mozilla::MutexAutoLock& aLock);
+
+  LookupStatus CompleteLookupLocked(nsHostRecord*, nsresult,
+                                    mozilla::net::AddrInfo*, bool pb,
+                                    const nsACString& aOriginsuffix,
+                                    mozilla::net::TRRSkippedReason aReason,
+                                    mozilla::net::TRR* aTRRRequest,
+                                    const mozilla::MutexAutoLock& aLock)
+      MOZ_REQUIRES(mLock);
+  LookupStatus CompleteLookupByTypeLocked(
+      nsHostRecord*, nsresult, mozilla::net::TypeRecordResultType& aResult,
+      uint32_t aTtl, bool pb, const mozilla::MutexAutoLock& aLock)
+      MOZ_REQUIRES(mLock);
+  nsresult Init();
+  static void ComputeEffectiveTRRMode(nsHostRecord* aRec);
+  nsresult NativeLookup(nsHostRecord* aRec,
+                        const mozilla::MutexAutoLock& aLock);
+  nsresult TrrLookup(nsHostRecord*, const mozilla::MutexAutoLock& aLock,
+                     mozilla::net::TRR* pushedTRR = nullptr);
+
+  // Kick-off a name resolve operation, using native resolver and/or TRR
+  nsresult NameLookup(nsHostRecord* aRec, const mozilla::MutexAutoLock& aLock);
+  bool GetHostToLookup(AddrHostRecord** result);
+  void MaybeRenewHostRecordLocked(nsHostRecord* aRec,
+                                  const mozilla::MutexAutoLock& aLock)
+      MOZ_REQUIRES(mLock);
+
+  // Cancels host records in the pending queue and also
+  // calls CompleteLookup with the NS_ERROR_ABORT result code.
+  void ClearPendingQueue(mozilla::LinkedList<RefPtr<nsHostRecord>>& aPendingQ);
+  nsresult ConditionallyCreateThread(nsHostRecord* rec) MOZ_REQUIRES(mLock);
+
+  /**
+   * Starts a new lookup in the background for entries that are in the grace
+   * period with a failed connect or all cached entries are negative.
+   */
+  nsresult ConditionallyRefreshRecord(nsHostRecord* rec, const nsACString& host,
+                                      const mozilla::MutexAutoLock& aLock)
+      MOZ_REQUIRES(mLock);
+
+  void AddToEvictionQ(nsHostRecord* rec, const mozilla::MutexAutoLock& aLock)
+      MOZ_REQUIRES(mLock);
+
+  void ThreadFunc();
+
+  // Resolve the host from the DNS cache.
+  already_AddRefed<nsHostRecord> FromCache(nsHostRecord* aRec,
+                                           const nsACString& aHost,
+                                           uint16_t aType, nsresult& aStatus,
+                                           const mozilla::MutexAutoLock& aLock)
+      MOZ_REQUIRES(mLock);
+  // Called when the host name is an IP address and has been passed.
+  already_AddRefed<nsHostRecord> FromCachedIPLiteral(nsHostRecord* aRec);
+  // Like the above function, but the host name is not parsed to NetAddr yet.
+  already_AddRefed<nsHostRecord> FromIPLiteral(
+      AddrHostRecord* aAddrRec, const mozilla::net::NetAddr& aAddr);
+  // Called to check if we have an AF_UNSPEC entry in the cache.
+  already_AddRefed<nsHostRecord> FromUnspecEntry(
+      nsHostRecord* aRec, const nsACString& aHost, const nsACString& aTrrServer,
+      const nsACString& aOriginSuffix, uint16_t aType,
+      nsIDNSService::DNSFlags aFlags, uint16_t af, bool aPb, nsresult& aStatus)
+      MOZ_REQUIRES(mLock);
+
+  enum {
+    METHOD_HIT = 1,
+    METHOD_RENEWAL = 2,
+    METHOD_NEGATIVE_HIT = 3,
+    METHOD_LITERAL = 4,
+    METHOD_OVERFLOW = 5,
+    METHOD_NETWORK_FIRST = 6,
+    METHOD_NETWORK_SHARED = 7
+  };
+
+  uint32_t mMaxCacheEntries = 0;
+  uint32_t mDefaultCacheLifetime = 0;  // granularity seconds
+  uint32_t mDefaultGracePeriod = 0;    // granularity seconds
+  // mutable so SizeOfIncludingThis can be const
+  mutable Mutex mLock{"nsHostResolver.mLock"};
+  CondVar mIdleTaskCV;
+  nsRefPtrHashtable<nsGenericHashKey<nsHostKey>, nsHostRecord> mRecordDB
+      MOZ_GUARDED_BY(mLock);
+  PRTime mCreationTime;
+  mozilla::TimeDuration mLongIdleTimeout;
+  mozilla::TimeDuration mShortIdleTimeout;
+
+  RefPtr<nsIThreadPool> mResolverThreads;
+  RefPtr<mozilla::net::NetworkConnectivityService>
+      mNCS;  // reference to a singleton
+  mozilla::net::HostRecordQueue mQueue MOZ_GUARDED_BY(mLock);
+  mozilla::Atomic<bool> mShutdown MOZ_GUARDED_BY(mLock){true};
+  mozilla::Atomic<uint32_t> mNumIdleTasks MOZ_GUARDED_BY(mLock){0};
+  mozilla::Atomic<uint32_t> mActiveTaskCount MOZ_GUARDED_BY(mLock){0};
+  mozilla::Atomic<uint32_t> mActiveAnyThreadCount MOZ_GUARDED_BY(mLock){0};
+
+  // Set the expiration time stamps appropriately.
+  void PrepareRecordExpirationAddrRecord(AddrHostRecord* rec) const;
+
+ public:
+  /*
+   * Called by the networking dashboard via the DnsService2
+   */
+  void GetDNSCacheEntries(nsTArray<mozilla::net::DNSCacheEntries>*);
+};
+
+#endif  // nsHostResolver_h__