Adding upstream version 124.0.1.upstream/124.0.1

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

3 files changed, 851 insertions, 0 deletions

diff --git a/netwerk/system/win32/moz.build b/netwerk/system/win32/moz.build
new file mode 100644
index 0000000000..2d7e668c3c
--- /dev/null
+++ b/netwerk/system/win32/moz.build
@@ -0,0 +1,16 @@
+# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# vim: set filetype=python:
+# 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/.
+
+if CONFIG["OS_ARCH"] == "WINNT":
+    SOURCES += [
+        "nsNotifyAddrListener.cpp",
+    ]
+
+LOCAL_INCLUDES += [
+    "/netwerk/base",
+]
+
+FINAL_LIBRARY = "xul"
diff --git a/netwerk/system/win32/nsNotifyAddrListener.cpp b/netwerk/system/win32/nsNotifyAddrListener.cpp
new file mode 100644
index 0000000000..a64206fbc6
--- /dev/null
+++ b/netwerk/system/win32/nsNotifyAddrListener.cpp
@@ -0,0 +1,736 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set et sw=2 ts=4: */
+/* 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/. */
+
+// We define this to make our use of inet_ntoa() pass. The "proper" function
+// inet_ntop() doesn't exist on Windows XP.
+#define _WINSOCK_DEPRECATED_NO_WARNINGS
+
+#include <algorithm>
+#include <vector>
+
+#include <stdarg.h>
+#include <windef.h>
+#include <winbase.h>
+#include <wingdi.h>
+#include <winuser.h>
+#include <ole2.h>
+#include <netcon.h>
+#include <objbase.h>
+#include <winsock2.h>
+#include <ws2ipdef.h>
+#include <tcpmib.h>
+#include <iphlpapi.h>
+#include <netioapi.h>
+#include <netlistmgr.h>
+#include <iprtrmib.h>
+#include "mozilla/Logging.h"
+#include "nsComponentManagerUtils.h"
+#include "nsThreadUtils.h"
+#include "nsIObserverService.h"
+#include "nsIWindowsRegKey.h"
+#include "nsServiceManagerUtils.h"
+#include "nsNetAddr.h"
+#include "nsNotifyAddrListener.h"
+#include "nsString.h"
+#include "nsPrintfCString.h"
+#include "mozilla/Services.h"
+#include "nsCRT.h"
+#include "nsThreadPool.h"
+#include "mozilla/StaticPrefs_network.h"
+#include "mozilla/SHA1.h"
+#include "mozilla/Base64.h"
+#include "mozilla/ScopeExit.h"
+#include "mozilla/Telemetry.h"
+#include "../LinkServiceCommon.h"
+#include <iptypes.h>
+#include <iphlpapi.h>
+
+using namespace mozilla;
+
+static LazyLogModule gNotifyAddrLog("nsNotifyAddr");
+#define LOG(args) MOZ_LOG(gNotifyAddrLog, mozilla::LogLevel::Debug, args)
+#define LOG_ENABLED() MOZ_LOG_TEST(gNotifyAddrLog, mozilla::LogLevel::Debug)
+
+// period during which to absorb subsequent network change events, in
+// milliseconds
+static const unsigned int kNetworkChangeCoalescingPeriod = 1000;
+
+NS_IMPL_ISUPPORTS(nsNotifyAddrListener, nsINetworkLinkService, nsIRunnable,
+                  nsIObserver)
+
+nsNotifyAddrListener::nsNotifyAddrListener()
+    : mLinkUp(true),  // assume true by default
+      mStatusKnown(false),
+      mCheckAttempted(false),
+      mMutex("nsNotifyAddrListener::mMutex"),
+      mCheckEvent(nullptr),
+      mShutdown(false),
+      mPlatformDNSIndications(NONE_DETECTED),
+      mIPInterfaceChecksum(0),
+      mCoalescingActive(false) {}
+
+nsNotifyAddrListener::~nsNotifyAddrListener() {
+  NS_ASSERTION(!mThread, "nsNotifyAddrListener thread shutdown failed");
+}
+
+NS_IMETHODIMP
+nsNotifyAddrListener::GetIsLinkUp(bool* aIsUp) {
+  if (!mCheckAttempted && !mStatusKnown) {
+    mCheckAttempted = true;
+    CheckLinkStatus();
+  }
+
+  *aIsUp = mLinkUp;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNotifyAddrListener::GetLinkStatusKnown(bool* aIsUp) {
+  *aIsUp = mStatusKnown;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNotifyAddrListener::GetLinkType(uint32_t* aLinkType) {
+  NS_ENSURE_ARG_POINTER(aLinkType);
+
+  // XXX This function has not yet been implemented for this platform
+  *aLinkType = nsINetworkLinkService::LINK_TYPE_UNKNOWN;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNotifyAddrListener::GetNetworkID(nsACString& aNetworkID) {
+  MutexAutoLock lock(mMutex);
+  aNetworkID = mNetworkId;
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNotifyAddrListener::GetDnsSuffixList(nsTArray<nsCString>& aDnsSuffixList) {
+  aDnsSuffixList.Clear();
+  MutexAutoLock lock(mMutex);
+  aDnsSuffixList.AppendElements(mDnsSuffixList);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNotifyAddrListener::GetResolvers(nsTArray<RefPtr<nsINetAddr>>& aResolvers) {
+  nsTArray<mozilla::net::NetAddr> addresses;
+  nsresult rv = GetNativeResolvers(addresses);
+  if (NS_FAILED(rv)) {
+    return rv;
+  }
+
+  for (const auto& addr : addresses) {
+    aResolvers.AppendElement(MakeRefPtr<nsNetAddr>(&addr));
+  }
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNotifyAddrListener::GetNativeResolvers(
+    nsTArray<mozilla::net::NetAddr>& aResolvers) {
+  aResolvers.Clear();
+  MutexAutoLock lock(mMutex);
+  aResolvers.AppendElements(mDNSResolvers);
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNotifyAddrListener::GetPlatformDNSIndications(
+    uint32_t* aPlatformDNSIndications) {
+  *aPlatformDNSIndications = mPlatformDNSIndications;
+  return NS_OK;
+}
+
+//
+// Hash the sorted network ids
+//
+void nsNotifyAddrListener::HashSortedNetworkIds(std::vector<GUID> nwGUIDS,
+                                                SHA1Sum& sha1) {
+  std::sort(nwGUIDS.begin(), nwGUIDS.end(), [](const GUID& a, const GUID& b) {
+    return memcmp(&a, &b, sizeof(GUID)) < 0;
+  });
+
+  for (auto const& nwGUID : nwGUIDS) {
+    sha1.update(&nwGUID, sizeof(GUID));
+
+    if (LOG_ENABLED()) {
+      nsPrintfCString guid("%08lX%04X%04X%02X%02X%02X%02X%02X%02X%02X%02X",
+                           nwGUID.Data1, nwGUID.Data2, nwGUID.Data3,
+                           nwGUID.Data4[0], nwGUID.Data4[1], nwGUID.Data4[2],
+                           nwGUID.Data4[3], nwGUID.Data4[4], nwGUID.Data4[5],
+                           nwGUID.Data4[6], nwGUID.Data4[7]);
+      LOG(("calculateNetworkId: interface networkID: %s\n", guid.get()));
+    }
+  }
+}
+
+//
+// Figure out the current "network identification" string.
+//
+void nsNotifyAddrListener::calculateNetworkId(void) {
+  MOZ_ASSERT(!NS_IsMainThread(), "Must not be called on the main thread");
+
+  // No need to recompute the networkId if we're shutting down.
+  if (mShutdown) {
+    return;
+  }
+
+  if (FAILED(CoInitializeEx(nullptr, COINIT_MULTITHREADED))) {
+    return;
+  }
+
+  auto unitialize = MakeScopeExit([]() { CoUninitialize(); });
+
+  RefPtr<INetworkListManager> nlm;
+  HRESULT hr = CoCreateInstance(CLSID_NetworkListManager, nullptr, CLSCTX_ALL,
+                                IID_INetworkListManager, getter_AddRefs(nlm));
+  if (NS_WARN_IF(FAILED(hr))) {
+    LOG(("CoCreateInstance error: %lX", hr));
+    return;
+  }
+  RefPtr<IEnumNetworks> enumNetworks;
+  hr = nlm->GetNetworks(NLM_ENUM_NETWORK_CONNECTED,
+                        getter_AddRefs(enumNetworks));
+  if (NS_WARN_IF(FAILED(hr))) {
+    LOG(("GetNetworks error: %lX", hr));
+    return;
+  }
+
+  // We will hash the found network ids
+  // for privacy reasons
+  SHA1Sum sha1;
+
+  // The networks stored in enumNetworks
+  // are not ordered. We will sort them
+  // To keep a consistent hash
+  // regardless of the found networks order.
+  std::vector<GUID> nwGUIDS;
+
+  // Consume the found networks iterator
+  while (true) {
+    RefPtr<INetwork> network;
+    hr = enumNetworks->Next(1, getter_AddRefs(network), nullptr);
+    if (hr != S_OK) {
+      break;
+    }
+
+    GUID nwGUID;
+    hr = network->GetNetworkId(&nwGUID);
+    if (hr != S_OK) {
+      continue;
+    }
+    nwGUIDS.push_back(nwGUID);
+  }
+
+  if (nwGUIDS.empty()) {
+    bool idChanged = false;
+    {
+      MutexAutoLock lock(mMutex);
+      if (!mNetworkId.IsEmpty()) {
+        idChanged = true;
+      }
+      mNetworkId.Truncate();
+    }
+    LOG(("calculateNetworkId: no network ID - no active networks"));
+    Telemetry::Accumulate(Telemetry::NETWORK_ID2, 0);
+    if (idChanged) {
+      NotifyObservers(NS_NETWORK_ID_CHANGED_TOPIC, nullptr);
+    }
+    return;
+  }
+
+  nsAutoCString output;
+  SHA1Sum::Hash digest;
+  HashSortedNetworkIds(nwGUIDS, sha1);
+  SeedNetworkId(sha1);
+  sha1.finish(digest);
+  nsCString newString(reinterpret_cast<char*>(digest), SHA1Sum::kHashSize);
+  nsresult rv = Base64Encode(newString, output);
+  if (NS_FAILED(rv)) {
+    {
+      MutexAutoLock lock(mMutex);
+      mNetworkId.Truncate();
+    }
+    Telemetry::Accumulate(Telemetry::NETWORK_ID2, 0);
+    LOG(("calculateNetworkId: no network ID Base64Encode error %X",
+         uint32_t(rv)));
+    return;
+  }
+
+  MutexAutoLock lock(mMutex);
+  if (output != mNetworkId) {
+    mNetworkId = output;
+    Telemetry::Accumulate(Telemetry::NETWORK_ID2, 1);
+    LOG(("calculateNetworkId: new NetworkID: %s", output.get()));
+    NotifyObservers(NS_NETWORK_ID_CHANGED_TOPIC, nullptr);
+  } else {
+    Telemetry::Accumulate(Telemetry::NETWORK_ID2, 2);
+    LOG(("calculateNetworkId: same NetworkID: %s", output.get()));
+  }
+}
+
+// Static Callback function for NotifyIpInterfaceChange API.
+static void WINAPI OnInterfaceChange(PVOID callerContext,
+                                     PMIB_IPINTERFACE_ROW row,
+                                     MIB_NOTIFICATION_TYPE notificationType) {
+  nsNotifyAddrListener* notify =
+      static_cast<nsNotifyAddrListener*>(callerContext);
+  notify->CheckLinkStatus();
+}
+
+DWORD
+nsNotifyAddrListener::nextCoalesceWaitTime() {
+  // check if coalescing period should continue
+  double period = (TimeStamp::Now() - mChangeTime).ToMilliseconds();
+  if (period >= kNetworkChangeCoalescingPeriod) {
+    NotifyObservers(NS_NETWORK_LINK_TOPIC, NS_NETWORK_LINK_DATA_CHANGED);
+    mCoalescingActive = false;
+    return INFINITE;  // return default
+  } else {
+    // wait no longer than to the end of the period
+    return static_cast<DWORD>(kNetworkChangeCoalescingPeriod - period);
+  }
+}
+
+NS_IMETHODIMP
+nsNotifyAddrListener::Run() {
+  mStartTime = TimeStamp::Now();
+
+  calculateNetworkId();
+
+  DWORD waitTime = INFINITE;
+
+  // Windows Vista and newer versions.
+  HANDLE interfacechange;
+  // The callback will simply invoke CheckLinkStatus()
+  DWORD ret = NotifyIpInterfaceChange(
+      StaticPrefs::network_notify_IPv6() ? AF_UNSPEC
+                                         : AF_INET,  // IPv4 and IPv6
+      (PIPINTERFACE_CHANGE_CALLBACK)OnInterfaceChange,
+      this,                                        // pass to callback
+      StaticPrefs::network_notify_initial_call(),  // initial notification
+      &interfacechange);
+
+  if (ret == NO_ERROR) {
+    do {
+      ret = WaitForSingleObject(mCheckEvent, waitTime);
+      if (!mShutdown) {
+        waitTime = nextCoalesceWaitTime();
+      } else {
+        break;
+      }
+    } while (ret != WAIT_FAILED);
+    CancelMibChangeNotify2(interfacechange);
+  } else {
+    LOG(("Link Monitor: NotifyIpInterfaceChange returned %d\n", (int)ret));
+  }
+
+  return NS_OK;
+}
+
+NS_IMETHODIMP
+nsNotifyAddrListener::Observe(nsISupports* subject, const char* topic,
+                              const char16_t* data) {
+  if (!strcmp("xpcom-shutdown-threads", topic)) Shutdown();
+
+  return NS_OK;
+}
+
+nsresult nsNotifyAddrListener::Init(void) {
+  nsCOMPtr<nsIObserverService> observerService =
+      mozilla::services::GetObserverService();
+  if (!observerService) return NS_ERROR_FAILURE;
+
+  nsresult rv =
+      observerService->AddObserver(this, "xpcom-shutdown-threads", false);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  mCheckEvent = CreateEventW(nullptr, FALSE, FALSE, nullptr);
+  NS_ENSURE_TRUE(mCheckEvent, NS_ERROR_OUT_OF_MEMORY);
+
+  nsCOMPtr<nsIThreadPool> threadPool = new nsThreadPool();
+  MOZ_ALWAYS_SUCCEEDS(threadPool->SetThreadLimit(1));
+  MOZ_ALWAYS_SUCCEEDS(
+      threadPool->SetThreadStackSize(nsIThreadManager::kThreadPoolStackSize));
+  MOZ_ALWAYS_SUCCEEDS(threadPool->SetName("Link Monitor"_ns));
+  mThread = threadPool.forget();
+
+  return mThread->Dispatch(this, NS_DISPATCH_NORMAL);
+}
+
+nsresult nsNotifyAddrListener::Shutdown(void) {
+  // remove xpcom shutdown observer
+  nsCOMPtr<nsIObserverService> observerService =
+      mozilla::services::GetObserverService();
+  if (observerService)
+    observerService->RemoveObserver(this, "xpcom-shutdown-threads");
+
+  if (!mCheckEvent) return NS_OK;
+
+  mShutdown = true;
+  SetEvent(mCheckEvent);
+
+  nsresult rv = mThread ? mThread->ShutdownWithTimeout(2000) : NS_OK;
+
+  // Have to break the cycle here, otherwise nsNotifyAddrListener holds
+  // onto the thread and the thread holds onto the nsNotifyAddrListener
+  // via its mRunnable
+  mThread = nullptr;
+
+  CloseHandle(mCheckEvent);
+  mCheckEvent = nullptr;
+
+  return rv;
+}
+
+/*
+ * A network event has been registered. Delay the actual sending of the event
+ * for a while and absorb subsequent events in the mean time in an effort to
+ * squash potentially many triggers into a single event.
+ * Only ever called from the same thread.
+ */
+nsresult nsNotifyAddrListener::NetworkChanged() {
+  if (mCoalescingActive) {
+    LOG(("NetworkChanged: absorbed an event (coalescing active)\n"));
+  } else {
+    // A fresh trigger!
+    mChangeTime = TimeStamp::Now();
+    mCoalescingActive = true;
+    SetEvent(mCheckEvent);
+    LOG(("NetworkChanged: coalescing period started\n"));
+  }
+  return NS_OK;
+}
+
+/* Sends the given event.  Assumes aTopic/aData never goes out of scope (static
+ * strings are ideal).
+ */
+nsresult nsNotifyAddrListener::NotifyObservers(const char* aTopic,
+                                               const char* aData) {
+  LOG(("NotifyObservers: %s=%s\n", aTopic, aData));
+
+  if (mShutdown) {
+    LOG(("NotifyObservers call failed when called during shutdown"));
+    return NS_ERROR_ILLEGAL_DURING_SHUTDOWN;
+  }
+
+  auto runnable = [self = RefPtr<nsNotifyAddrListener>(this), aTopic, aData] {
+    nsCOMPtr<nsIObserverService> observerService =
+        mozilla::services::GetObserverService();
+    if (observerService)
+      observerService->NotifyObservers(
+          static_cast<nsINetworkLinkService*>(self.get()), aTopic,
+          !aData ? nullptr : NS_ConvertASCIItoUTF16(aData).get());
+  };
+  nsresult rv = NS_DispatchToMainThread(NS_NewRunnableFunction(
+      "nsNotifyAddrListener::NotifyObservers", runnable));
+  if (NS_FAILED(rv)) {
+    NS_WARNING(
+        "nsNotifyAddrListener::NotifyObservers Failed to dispatch observer "
+        "notification");
+  }
+  return rv;
+}
+
+DWORD
+nsNotifyAddrListener::CheckAdaptersAddresses(void) {
+  MOZ_ASSERT(!NS_IsMainThread(), "Don't call this on the main thread");
+  ULONG len = 16384;
+
+  PIP_ADAPTER_ADDRESSES adapterList = (PIP_ADAPTER_ADDRESSES)moz_xmalloc(len);
+
+  ULONG flags = GAA_FLAG_SKIP_MULTICAST | GAA_FLAG_SKIP_ANYCAST;
+  if (!StaticPrefs::network_notify_resolvers()) {
+    flags |= GAA_FLAG_SKIP_DNS_SERVER;
+  }
+
+  DWORD ret =
+      GetAdaptersAddresses(AF_UNSPEC, flags, nullptr, adapterList, &len);
+  if (ret == ERROR_BUFFER_OVERFLOW) {
+    free(adapterList);
+    adapterList = static_cast<PIP_ADAPTER_ADDRESSES>(moz_xmalloc(len));
+
+    ret = GetAdaptersAddresses(AF_UNSPEC, flags, nullptr, adapterList, &len);
+  }
+
+  if (FAILED(CoInitializeEx(nullptr, COINIT_MULTITHREADED))) {
+    free(adapterList);
+    return ERROR_NOT_SUPPORTED;
+  }
+
+  //
+  // Since NotifyIpInterfaceChange() signals a change more often than we
+  // think is a worthy change, we checksum the entire state of all interfaces
+  // that are UP. If the checksum is the same as previous check, nothing
+  // of interest changed!
+  //
+  ULONG sumAll = 0;
+
+  nsTArray<nsCString> dnsSuffixList;
+  nsTArray<mozilla::net::NetAddr> resolvers;
+  uint32_t platformDNSIndications = NONE_DETECTED;
+  if (ret == ERROR_SUCCESS) {
+    bool linkUp = false;
+    ULONG sum = 0;
+
+    for (PIP_ADAPTER_ADDRESSES adapter = adapterList; adapter;
+         adapter = adapter->Next) {
+      if (adapter->OperStatus != IfOperStatusUp ||
+          !adapter->FirstUnicastAddress ||
+          adapter->IfType == IF_TYPE_SOFTWARE_LOOPBACK) {
+        continue;
+      }
+
+      LOG(("Adapter %s type: %lu",
+           NS_ConvertUTF16toUTF8(adapter->FriendlyName).get(),
+           adapter->IfType));
+
+      if (adapter->IfType == IF_TYPE_PPP ||
+          adapter->IfType == IF_TYPE_PROP_VIRTUAL ||
+          nsDependentString(adapter->FriendlyName).Find(u"VPN") != kNotFound ||
+          nsDependentString(adapter->Description).Find(u"VPN") != kNotFound) {
+        LOG(("VPN connection found"));
+        platformDNSIndications |= VPN_DETECTED;
+      }
+
+      sum <<= 2;
+      // Add chars from AdapterName to the checksum.
+      for (int i = 0; adapter->AdapterName[i]; ++i) {
+        sum += adapter->AdapterName[i];
+      }
+
+      // Add bytes from each socket address to the checksum.
+      for (PIP_ADAPTER_UNICAST_ADDRESS pip = adapter->FirstUnicastAddress; pip;
+           pip = pip->Next) {
+        SOCKET_ADDRESS* sockAddr = &pip->Address;
+        for (int i = 0; i < sockAddr->iSockaddrLength; ++i) {
+          sum += (reinterpret_cast<unsigned char*>(sockAddr->lpSockaddr))[i];
+        }
+      }
+
+      for (IP_ADAPTER_DNS_SERVER_ADDRESS* pDnServer =
+               adapter->FirstDnsServerAddress;
+           pDnServer; pDnServer = pDnServer->Next) {
+        mozilla::net::NetAddr addr;
+        if (pDnServer->Address.lpSockaddr->sa_family == AF_INET) {
+          const struct sockaddr_in* sin =
+              (const struct sockaddr_in*)pDnServer->Address.lpSockaddr;
+          addr.inet.family = AF_INET;
+          addr.inet.ip = sin->sin_addr.s_addr;
+          addr.inet.port = sin->sin_port;
+        } else if (pDnServer->Address.lpSockaddr->sa_family == AF_INET6) {
+          const struct sockaddr_in6* sin6 =
+              (const struct sockaddr_in6*)pDnServer->Address.lpSockaddr;
+          addr.inet6.family = AF_INET6;
+          memcpy(&addr.inet6.ip.u8, &sin6->sin6_addr, sizeof(addr.inet6.ip.u8));
+          addr.inet6.port = sin6->sin6_port;
+        } else {
+          NS_WARNING("Unexpected addr type");
+          continue;
+        }
+
+        if (LOG_ENABLED()) {
+          char buf[100];
+          addr.ToStringBuffer(buf, 100);
+          LOG(("Found DNS resolver=%s", buf));
+        }
+        resolvers.AppendElement(addr);
+      }
+
+      if (StaticPrefs::network_notify_dnsSuffixList()) {
+        nsCString suffix = NS_ConvertUTF16toUTF8(adapter->DnsSuffix);
+        if (!suffix.IsEmpty()) {
+          LOG(("  found DNS suffix=%s\n", suffix.get()));
+          dnsSuffixList.AppendElement(suffix);
+        }
+      }
+
+      linkUp = true;
+      sumAll ^= sum;
+    }
+    mLinkUp = linkUp;
+    mStatusKnown = true;
+  }
+  free(adapterList);
+
+  if (mLinkUp) {
+    /* Store the checksum only if one or more interfaces are up */
+    mIPInterfaceChecksum = sumAll;
+  }
+
+  CoUninitialize();
+
+  if (StaticPrefs::network_notify_dnsSuffixList()) {
+    // It seems that the only way to retrieve non-connection specific DNS
+    // suffixes is via the Windows registry.
+
+    // This function takes a registry path. If aRegPath\\SearchList is
+    // found and successfully parsed, then it returns true. Otherwise it
+    // returns false.
+    auto checkRegistry = [&dnsSuffixList](const nsAString& aRegPath) -> bool {
+      nsresult rv;
+      nsCOMPtr<nsIWindowsRegKey> regKey =
+          do_CreateInstance("@mozilla.org/windows-registry-key;1", &rv);
+      if (NS_FAILED(rv)) {
+        LOG(("  creating nsIWindowsRegKey failed\n"));
+        return false;
+      }
+      rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE, aRegPath,
+                        nsIWindowsRegKey::ACCESS_READ);
+      if (NS_FAILED(rv)) {
+        LOG(("  opening registry key failed\n"));
+        return false;
+      }
+      nsAutoString wideSuffixString;
+      rv = regKey->ReadStringValue(u"SearchList"_ns, wideSuffixString);
+      if (NS_FAILED(rv)) {
+        LOG(("  reading registry string value failed\n"));
+        return false;
+      }
+
+      // Normally the key should not contain whitespace, but editing the
+      // registry manually or through gpedit doesn't alway enforce this.
+      nsAutoCString list = NS_ConvertUTF16toUTF8(wideSuffixString);
+      list.StripWhitespace();
+      for (const nsACString& suffix : list.Split(',')) {
+        LOG(("  appending DNS suffix from registry: %s\n",
+             suffix.BeginReading()));
+        if (!suffix.IsEmpty()) {
+          dnsSuffixList.AppendElement(suffix);
+        }
+      }
+
+      return true;
+    };
+
+    // The Local group policy overrides the user set suffix list, so we must
+    // first check the registry key that is sets by gpedit, and if that fails we
+    // fall back to the one that is set by the user.
+    if (!checkRegistry(nsLiteralString(
+            u"SOFTWARE\\Policies\\Microsoft\\Windows NT\\DNSClient"))) {
+      checkRegistry(nsLiteralString(
+          u"SYSTEM\\CurrentControlSet\\Services\\Tcpip\\Parameters"));
+    }
+  }
+
+  auto registryChildCount = [](const nsAString& aRegPath) -> uint32_t {
+    nsresult rv;
+    nsCOMPtr<nsIWindowsRegKey> regKey =
+        do_CreateInstance("@mozilla.org/windows-registry-key;1", &rv);
+    if (NS_FAILED(rv)) {
+      LOG(("  creating nsIWindowsRegKey failed\n"));
+      return 0;
+    }
+    rv = regKey->Open(nsIWindowsRegKey::ROOT_KEY_LOCAL_MACHINE, aRegPath,
+                      nsIWindowsRegKey::ACCESS_READ);
+    if (NS_FAILED(rv)) {
+      LOG(("  opening registry key failed\n"));
+      return 0;
+    }
+
+    uint32_t count = 0;
+    rv = regKey->GetChildCount(&count);
+    if (NS_FAILED(rv)) {
+      return 0;
+    }
+
+    return count;
+  };
+
+  if (StaticPrefs::network_notify_checkForProxies()) {
+    if (registryChildCount(u"SYSTEM\\CurrentControlSet\\Services\\Dnscache\\"
+                           "Parameters\\DnsConnections"_ns) > 0 ||
+        registryChildCount(u"SYSTEM\\CurrentControlSet\\Services\\Dnscache\\"
+                           "Parameters\\DnsConnectionsProxies"_ns) > 0) {
+      platformDNSIndications |= PROXY_DETECTED;
+    }
+  }
+
+  if (StaticPrefs::network_notify_checkForNRPT()) {
+    if (registryChildCount(u"SYSTEM\\CurrentControlSet\\Services\\Dnscache\\"
+                           "Parameters\\DnsPolicyConfig"_ns) > 0 ||
+        registryChildCount(u"SOFTWARE\\Policies\\Microsoft\\Windows NT\\"
+                           "DNSClient\\DnsPolicyConfig"_ns) > 0) {
+      platformDNSIndications |= NRPT_DETECTED;
+    }
+  }
+
+  {
+    MutexAutoLock lock(mMutex);
+    mDnsSuffixList = std::move(dnsSuffixList);
+    mDNSResolvers = std::move(resolvers);
+    mPlatformDNSIndications = platformDNSIndications;
+  }
+
+  NotifyObservers(NS_DNS_SUFFIX_LIST_UPDATED_TOPIC, nullptr);
+
+  calculateNetworkId();
+
+  return ret;
+}
+
+/**
+ * Checks the status of all network adapters.  If one is up and has a valid IP
+ * address, sets mLinkUp to true.  Sets mStatusKnown to true if the link status
+ * is definitive.
+ */
+void nsNotifyAddrListener::CheckLinkStatus(void) {
+  DWORD ret;
+  const char* event;
+  bool prevLinkUp = mLinkUp;
+  ULONG prevCsum = mIPInterfaceChecksum;
+
+  LOG(("check status of all network adapters\n"));
+
+  // The CheckAdaptersAddresses call is very expensive (~650 milliseconds),
+  // so we don't want to call it synchronously. Instead, we just start up
+  // assuming we have a network link, but we'll report that the status is
+  // unknown.
+  if (NS_IsMainThread()) {
+    NS_WARNING(
+        "CheckLinkStatus called on main thread! No check "
+        "performed. Assuming link is up, status is unknown.");
+    mLinkUp = true;
+
+    if (!mStatusKnown) {
+      event = NS_NETWORK_LINK_DATA_UNKNOWN;
+    } else if (!prevLinkUp) {
+      event = NS_NETWORK_LINK_DATA_UP;
+    } else {
+      // Known status and it was already UP
+      event = nullptr;
+    }
+
+    if (event) {
+      NotifyObservers(NS_NETWORK_LINK_TOPIC, event);
+    }
+  } else {
+    ret = CheckAdaptersAddresses();
+    if (ret != ERROR_SUCCESS) {
+      mLinkUp = true;
+    }
+
+    if (mLinkUp && (prevCsum != mIPInterfaceChecksum)) {
+      TimeDuration since = TimeStamp::Now() - mStartTime;
+
+      // Network is online. Topology has changed. Always send CHANGED
+      // before UP - if allowed to and having cooled down.
+      if (StaticPrefs::network_notify_changed() &&
+          (since.ToMilliseconds() > 2000)) {
+        NetworkChanged();
+      }
+    }
+    if (prevLinkUp != mLinkUp) {
+      // UP/DOWN status changed, send appropriate UP/DOWN event
+      NotifyObservers(NS_NETWORK_LINK_TOPIC, mLinkUp
+                                                 ? NS_NETWORK_LINK_DATA_UP
+                                                 : NS_NETWORK_LINK_DATA_DOWN);
+    }
+  }
+}
diff --git a/netwerk/system/win32/nsNotifyAddrListener.h b/netwerk/system/win32/nsNotifyAddrListener.h
new file mode 100644
index 0000000000..30244685f2
--- /dev/null
+++ b/netwerk/system/win32/nsNotifyAddrListener.h
@@ -0,0 +1,99 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim:set et sw=2 ts=4: */
+/* 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 NSNOTIFYADDRLISTENER_H_
+#define NSNOTIFYADDRLISTENER_H_
+
+#include <windows.h>
+#include <winsock2.h>
+#include <iptypes.h>
+#include "nsINetworkLinkService.h"
+#include "nsIRunnable.h"
+#include "nsIObserver.h"
+#include "nsString.h"
+#include "nsTArray.h"
+#include "nsThreadUtils.h"
+#include "nsThreadPool.h"
+#include "nsCOMPtr.h"
+#include "mozilla/Atomics.h"
+#include "mozilla/TimeStamp.h"
+#include "mozilla/Mutex.h"
+#include "mozilla/SHA1.h"
+#include "mozilla/net/DNS.h"
+
+class nsIThreadPool;
+
+class nsNotifyAddrListener : public nsINetworkLinkService,
+                             public nsIRunnable,
+                             public nsIObserver {
+  virtual ~nsNotifyAddrListener();
+
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSINETWORKLINKSERVICE
+  NS_DECL_NSIRUNNABLE
+  NS_DECL_NSIOBSERVER
+
+  nsNotifyAddrListener();
+
+  nsresult Init(void);
+  void CheckLinkStatus(void);
+  static void HashSortedNetworkIds(const std::vector<GUID> nwGUIDS,
+                                   mozilla::SHA1Sum& sha1);
+
+ protected:
+  bool mLinkUp;
+  bool mStatusKnown;
+  bool mCheckAttempted;
+
+  nsresult Shutdown(void);
+  nsresult NotifyObservers(const char* aTopic, const char* aData);
+
+  DWORD CheckAdaptersAddresses(void);
+
+  // This threadpool only ever holds 1 thread. It is a threadpool and not a
+  // regular thread so that we may call shutdownWithTimeout on it.
+  nsCOMPtr<nsIThreadPool> mThread;
+
+ private:
+  // Returns the new timeout period for coalescing (or INFINITE)
+  DWORD nextCoalesceWaitTime();
+
+  // Called for every detected network change
+  nsresult NetworkChanged();
+
+  // Figure out the current network identification
+  void calculateNetworkId(void);
+  bool findMac(char* gateway);
+
+  mozilla::Mutex mMutex MOZ_UNANNOTATED;
+  nsCString mNetworkId;
+  nsTArray<nsCString> mDnsSuffixList;
+  nsTArray<mozilla::net::NetAddr> mDNSResolvers;
+
+  HANDLE mCheckEvent;
+
+  // set true when mCheckEvent means shutdown
+  mozilla::Atomic<bool> mShutdown;
+
+  // Contains a set of flags that codify the reasons for which
+  // the platform indicates DNS should be used instead of TRR.
+  mozilla::Atomic<uint32_t, mozilla::Relaxed> mPlatformDNSIndications;
+
+  // This is a checksum of various meta data for all network interfaces
+  // considered UP at last check.
+  ULONG mIPInterfaceChecksum;
+
+  // start time of the checking
+  mozilla::TimeStamp mStartTime;
+
+  // Flag set while coalescing change events
+  bool mCoalescingActive;
+
+  // Time stamp for first event during coalescing
+  mozilla::TimeStamp mChangeTime;
+};
+
+#endif /* NSNOTIFYADDRLISTENER_H_ */