Bug 1625151 - P1: Move DNS resolution to socket process r=dragana

Differential Revision: https://phabricator.services.mozilla.com/D68388

--HG--
extra : moz-landing-system : lando

netwerk/base/nsIOService.cpp

@@ -525,6 +525,10 @@ void nsIOService::NotifySocketProcessPrefsChanged(const char* aName) {
     return;
   }
 
+  if (!StaticPrefs::network_process_enabled()) {
+    return;
+  }
+
   dom::Pref pref(nsCString(aName), /* isLocked */ false, Nothing(), Nothing());
   Preferences::GetPreference(&pref);
   auto sendPrefUpdate = [pref]() {
@@ -562,6 +566,7 @@ void nsIOService::CallOrWaitForSocketProcess(
     aFunc();
   } else {
     mPendingEvents.AppendElement(aFunc);  // infallible
+    LaunchSocketProcess();
   }
 }
 

netwerk/dns/ChildDNSService.cpp

@@ -3,7 +3,9 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/net/ChildDNSService.h"
+#include "nsDNSPrefetch.h"
 #include "nsIDNSListener.h"
+#include "nsIOService.h"
 #include "nsThreadUtils.h"
 #include "nsIXPConnect.h"
 #include "nsIProtocolProxyService.h"
@@ -25,7 +27,10 @@ static StaticRefPtr<ChildDNSService> gChildDNSService;
 static const char kPrefNameDisablePrefetch[] = "network.dns.disablePrefetch";
 
 already_AddRefed<ChildDNSService> ChildDNSService::GetSingleton() {
-  MOZ_ASSERT(XRE_IsContentProcess() || XRE_IsSocketProcess());
+  MOZ_ASSERT_IF(nsIOService::UseSocketProcess(),
+                XRE_IsContentProcess() || XRE_IsParentProcess());
+  MOZ_ASSERT_IF(!nsIOService::UseSocketProcess(),
+                XRE_IsContentProcess() || XRE_IsSocketProcess());
 
   if (!gChildDNSService) {
     gChildDNSService = new ChildDNSService();
@@ -41,7 +46,13 @@ ChildDNSService::ChildDNSService()
     : mFirstTime(true),
       mDisablePrefetch(false),
       mPendingRequestsLock("DNSPendingRequestsLock") {
-  MOZ_ASSERT(XRE_IsContentProcess() || XRE_IsSocketProcess());
+  MOZ_ASSERT_IF(nsIOService::UseSocketProcess(),
+                XRE_IsContentProcess() || XRE_IsParentProcess());
+  MOZ_ASSERT_IF(!nsIOService::UseSocketProcess(),
+                XRE_IsContentProcess() || XRE_IsSocketProcess());
+  if (XRE_IsParentProcess() && nsIOService::UseSocketProcess()) {
+    nsDNSPrefetch::Initialize(this);
+  }
 }
 
 void ChildDNSService::GetDNSRecordHashKey(
@@ -68,6 +79,11 @@ nsresult ChildDNSService::AsyncResolveInternal(
     NS_ENSURE_TRUE(gNeckoChild != nullptr, NS_ERROR_FAILURE);
   }
 
+  bool resolveDNSInSocketProcess = false;
+  if (XRE_IsParentProcess() && nsIOService::UseSocketProcess()) {
+    resolveDNSInSocketProcess = true;
+  }
+
   if (mDisablePrefetch && (flags & RESOLVE_SPECULATE)) {
     return NS_ERROR_DNS_LOOKUP_QUEUE_FULL;
   }
@@ -87,8 +103,14 @@ nsresult ChildDNSService::AsyncResolveInternal(
     listener = new DNSListenerProxy(listener, target);
   }
 
-  RefPtr<DNSRequestChild> childReq = new DNSRequestChild(
+  RefPtr<DNSRequestSender> sender = new DNSRequestSender(
       hostname, aTrrServer, type, aOriginAttributes, flags, listener, target);
+  RefPtr<DNSRequestActor> dnsReq;
+  if (resolveDNSInSocketProcess) {
+    dnsReq = new DNSRequestParent(sender);
+  } else {
+    dnsReq = new DNSRequestChild(sender);
+  }
 
   {
     MutexAutoLock lock(mPendingRequestsLock);
@@ -97,19 +119,19 @@ nsresult ChildDNSService::AsyncResolveInternal(
                         originalListener, key);
     auto entry = mPendingRequests.LookupForAdd(key);
     if (entry) {
-      entry.Data()->AppendElement(childReq);
+      entry.Data()->AppendElement(sender);
     } else {
       entry.OrInsert([&]() {
-        auto* hashEntry = new nsTArray<RefPtr<DNSRequestChild>>();
-        hashEntry->AppendElement(childReq);
+        auto* hashEntry = new nsTArray<RefPtr<DNSRequestSender>>();
+        hashEntry->AppendElement(sender);
         return hashEntry;
       });
     }
   }
 
-  childReq->StartRequest();
+  sender->StartRequest();
 
-  childReq.forget(result);
+  sender.forget(result);
   return NS_OK;
 }
 
@@ -122,7 +144,7 @@ nsresult ChildDNSService::CancelAsyncResolveInternal(
   }
 
   MutexAutoLock lock(mPendingRequestsLock);
-  nsTArray<RefPtr<DNSRequestChild>>* hashEntry;
+  nsTArray<RefPtr<DNSRequestSender>>* hashEntry;
   nsCString key;
   GetDNSRecordHashKey(aHostname, aTrrServer, aType, aOriginAttributes, aFlags,
                       aListener, key);
@@ -347,7 +369,7 @@ ChildDNSService::GetMyHostName(nsACString& result) {
   return NS_ERROR_NOT_AVAILABLE;
 }
 
-void ChildDNSService::NotifyRequestDone(DNSRequestChild* aDnsRequest) {
+void ChildDNSService::NotifyRequestDone(DNSRequestSender* aDnsRequest) {
   // We need the original flags and listener for the pending requests hash.
   uint32_t originalFlags = aDnsRequest->mFlags & ~RESOLVE_OFFLINE;
   nsCOMPtr<nsIDNSListener> originalListener = aDnsRequest->mListener;
@@ -367,11 +389,11 @@ void ChildDNSService::NotifyRequestDone(DNSRequestChild* aDnsRequest) {
                       aDnsRequest->mType, aDnsRequest->mOriginAttributes,
                       originalFlags, originalListener, key);
 
-  nsTArray<RefPtr<DNSRequestChild>>* hashEntry;
+  nsTArray<RefPtr<DNSRequestSender>>* hashEntry;
 
   if (mPendingRequests.Get(key, &hashEntry)) {
     auto idx = hashEntry->IndexOf(aDnsRequest);
-    if (idx != nsTArray<RefPtr<DNSRequestChild>>::NoIndex) {
+    if (idx != nsTArray<RefPtr<DNSRequestSender>>::NoIndex) {
       hashEntry->RemoveElementAt(idx);
       if (hashEntry->IsEmpty()) {
         mPendingRequests.Remove(key);

netwerk/dns/ChildDNSService.h

@@ -12,6 +12,7 @@
 #include "mozilla/Attributes.h"
 #include "mozilla/Mutex.h"
 #include "DNSRequestChild.h"
+#include "DNSRequestParent.h"
 #include "nsHashKeys.h"
 #include "nsClassHashtable.h"
 
@@ -30,7 +31,7 @@ class ChildDNSService final : public nsPIDNSService, public nsIObserver {
 
   static already_AddRefed<ChildDNSService> GetSingleton();
 
-  void NotifyRequestDone(DNSRequestChild* aDnsRequest);
+  void NotifyRequestDone(DNSRequestSender* aDnsRequest);
 
  private:
   virtual ~ChildDNSService() = default;
@@ -54,7 +55,7 @@ class ChildDNSService final : public nsPIDNSService, public nsIObserver {
   bool mDisablePrefetch;
 
   // We need to remember pending dns requests to be able to cancel them.
-  nsClassHashtable<nsCStringHashKey, nsTArray<RefPtr<DNSRequestChild>>>
+  nsClassHashtable<nsCStringHashKey, nsTArray<RefPtr<DNSRequestSender>>>
       mPendingRequests;
   Mutex mPendingRequestsLock;
 };

netwerk/dns/DNSRequestBase.h

@@ -0,0 +1,148 @@
+/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* vim: set sw=2 ts=8 et tw=80 : */
+/* 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 mozilla_net_DNSRequestBase_h
+#define mozilla_net_DNSRequestBase_h
+
+#include "mozilla/net/PDNSRequestParent.h"
+#include "nsICancelable.h"
+#include "nsIDNSRecord.h"
+#include "nsIDNSListener.h"
+#include "nsIDNSByTypeRecord.h"
+#include "nsIEventTarget.h"
+
+namespace mozilla {
+namespace net {
+
+class DNSRequestActor;
+class DNSRequestChild;
+class DNSRequestHandler;
+class DNSRequestParent;
+class DNSRequestSender;
+
+// A base class for DNSRequestSender and DNSRequestHandler.
+// Provide interfaces for processing DNS requests.
+class DNSRequestBase : public nsISupports {
+ public:
+  explicit DNSRequestBase() = default;
+
+  void SetIPCActor(DNSRequestActor* aActor);
+
+  virtual void OnRecvCancelDNSRequest(const nsCString& hostName,
+                                      const nsCString& trrServer,
+                                      const uint16_t& type,
+                                      const OriginAttributes& originAttributes,
+                                      const uint32_t& flags,
+                                      const nsresult& reason) = 0;
+  virtual bool OnRecvLookupCompleted(const DNSRequestResponse& reply) = 0;
+  virtual void OnIPCActorDestroy() = 0;
+
+  virtual DNSRequestSender* AsDNSRequestSender() = 0;
+  virtual DNSRequestHandler* AsDNSRequestHandler() = 0;
+
+ protected:
+  virtual ~DNSRequestBase() = default;
+
+  RefPtr<DNSRequestActor> mIPCActor;
+};
+
+// DNSRequestSender is used to send an IPC request to DNSRequestHandler and
+// deliver the result to nsIDNSListener.
+// Note this class could be used both in content process and parent process.
+class DNSRequestSender final : public DNSRequestBase, public nsICancelable {
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSICANCELABLE
+
+  DNSRequestSender(const nsACString& aHost, const nsACString& aTrrServer,
+                   const uint16_t& aType,
+                   const OriginAttributes& aOriginAttributes,
+                   const uint32_t& aFlags, nsIDNSListener* aListener,
+                   nsIEventTarget* target);
+
+  void OnRecvCancelDNSRequest(const nsCString& hostName,
+                              const nsCString& trrServer, const uint16_t& type,
+                              const OriginAttributes& originAttributes,
+                              const uint32_t& flags,
+                              const nsresult& reason) override;
+  bool OnRecvLookupCompleted(const DNSRequestResponse& reply) override;
+  void OnIPCActorDestroy() override;
+
+  // Sends IPDL request to DNSRequestHandler
+  void StartRequest();
+  void CallOnLookupComplete();
+
+  DNSRequestSender* AsDNSRequestSender() override { return this; }
+  DNSRequestHandler* AsDNSRequestHandler() override { return nullptr; }
+
+ private:
+  friend class ChildDNSService;
+  virtual ~DNSRequestSender() = default;
+
+  nsCOMPtr<nsIDNSListener> mListener;
+  nsCOMPtr<nsIEventTarget> mTarget;
+  nsCOMPtr<nsIDNSRecord> mResultRecord;
+  nsresult mResultStatus;
+  nsCString mHost;
+  nsCString mTrrServer;
+  uint16_t mType;
+  const OriginAttributes mOriginAttributes;
+  uint16_t mFlags;
+};
+
+// DNSRequestHandler handles the dns request and sends the result back via IPC.
+// Note this class could be used both in parent process and socket process.
+class DNSRequestHandler final : public DNSRequestBase, public nsIDNSListener {
+ public:
+  NS_DECL_THREADSAFE_ISUPPORTS
+  NS_DECL_NSIDNSLISTENER
+
+  DNSRequestHandler();
+
+  void DoAsyncResolve(const nsACString& hostname, const nsACString& trrServer,
+                      uint16_t type, const OriginAttributes& originAttributes,
+                      uint32_t flags);
+
+  void OnRecvCancelDNSRequest(const nsCString& hostName,
+                              const nsCString& trrServer, const uint16_t& type,
+                              const OriginAttributes& originAttributes,
+                              const uint32_t& flags,
+                              const nsresult& reason) override;
+  bool OnRecvLookupCompleted(const DNSRequestResponse& reply) override;
+  void OnIPCActorDestroy() override;
+
+  DNSRequestSender* AsDNSRequestSender() override { return nullptr; }
+  DNSRequestHandler* AsDNSRequestHandler() override { return this; }
+
+ private:
+  virtual ~DNSRequestHandler() = default;
+
+  uint32_t mFlags;
+};
+
+// Provides some common methods for DNSRequestChild and DNSRequestParent.
+class DNSRequestActor {
+ public:
+  NS_INLINE_DECL_PURE_VIRTUAL_REFCOUNTING
+
+  explicit DNSRequestActor(DNSRequestBase* aRequest) : mDNSRequest(aRequest) {}
+
+  virtual bool CanSend() const = 0;
+  virtual DNSRequestChild* AsDNSRequestChild() = 0;
+  virtual DNSRequestParent* AsDNSRequestParent() = 0;
+
+  DNSRequestBase* GetDNSRequest() { return mDNSRequest.get(); };
+
+ protected:
+  virtual ~DNSRequestActor() = default;
+
+  RefPtr<DNSRequestBase> mDNSRequest;
+};
+
+}  // namespace net
+}  // namespace mozilla
+
+#endif  // mozilla_net_DNSRequestBase_h

netwerk/dns/DNSRequestChild.cpp

@@ -7,13 +7,16 @@
 #include "mozilla/dom/ContentChild.h"
 #include "mozilla/net/ChildDNSService.h"
 #include "mozilla/net/DNSRequestChild.h"
+#include "mozilla/net/DNSRequestParent.h"
 #include "mozilla/net/NeckoChild.h"
 #include "mozilla/net/SocketProcessChild.h"
 #include "mozilla/SchedulerGroup.h"
+#include "mozilla/net/SocketProcessParent.h"
 #include "mozilla/Unused.h"
 #include "nsIDNSRecord.h"
 #include "nsIDNSByTypeRecord.h"
 #include "nsHostResolver.h"
+#include "nsIOService.h"
 #include "nsTArray.h"
 #include "nsNetAddr.h"
 #include "nsThreadUtils.h"
@@ -23,6 +26,10 @@ using namespace mozilla::ipc;
 namespace mozilla {
 namespace net {
 
+void DNSRequestBase::SetIPCActor(DNSRequestActor* aActor) {
+  mIPCActor = aActor;
+}
+
 //-----------------------------------------------------------------------------
 // ChildDNSRecord:
 // A simple class to provide nsIDNSRecord on the child
@@ -193,37 +200,12 @@ ChildDNSByTypeRecord::GetRecordsAsOneString(nsACString& aRecords) {
 }
 
 //-----------------------------------------------------------------------------
-// CancelDNSRequestEvent
+// DNSRequestSender
 //-----------------------------------------------------------------------------
 
-class CancelDNSRequestEvent : public Runnable {
- public:
-  CancelDNSRequestEvent(DNSRequestChild* aDnsReq, nsresult aReason)
-      : Runnable("net::CancelDNSRequestEvent"),
-        mDnsRequest(aDnsReq),
-        mReasonForCancel(aReason) {}
+NS_IMPL_ISUPPORTS(DNSRequestSender, nsICancelable)
 
-  NS_IMETHOD Run() override {
-    if (mDnsRequest->CanSend()) {
-      // Send request to Parent process.
-      mDnsRequest->SendCancelDNSRequest(
-          mDnsRequest->mHost, mDnsRequest->mTrrServer, mDnsRequest->mType,
-          mDnsRequest->mOriginAttributes, mDnsRequest->mFlags,
-          mReasonForCancel);
-    }
-    return NS_OK;
-  }
-
- private:
-  RefPtr<DNSRequestChild> mDnsRequest;
-  nsresult mReasonForCancel;
-};
-
-//-----------------------------------------------------------------------------
-// DNSRequestChild
-//-----------------------------------------------------------------------------
-
-DNSRequestChild::DNSRequestChild(
+DNSRequestSender::DNSRequestSender(
     const nsACString& aHost, const nsACString& aTrrServer,
     const uint16_t& aType, const OriginAttributes& aOriginAttributes,
     const uint32_t& aFlags, nsIDNSListener* aListener, nsIEventTarget* target)
@@ -236,47 +218,105 @@ DNSRequestChild::DNSRequestChild(
       mOriginAttributes(aOriginAttributes),
       mFlags(aFlags) {}
 
-void DNSRequestChild::StartRequest() {
+void DNSRequestSender::OnRecvCancelDNSRequest(
+    const nsCString& hostName, const nsCString& trrServer, const uint16_t& type,
+    const OriginAttributes& originAttributes, const uint32_t& flags,
+    const nsresult& reason) {}
+
+NS_IMETHODIMP
+DNSRequestSender::Cancel(nsresult reason) {
+  if (!mIPCActor) {
+    return NS_ERROR_NOT_AVAILABLE;
+  }
+
+  if (mIPCActor->CanSend()) {
+    // We can only do IPDL on the main thread
+    nsCOMPtr<nsIRunnable> runnable = NS_NewRunnableFunction(
+        "net::CancelDNSRequestEvent",
+        [actor(mIPCActor), host(mHost), trrServer(mTrrServer), type(mType),
+         originAttributes(mOriginAttributes), flags(mFlags), reason]() {
+          if (!actor->CanSend()) {
+            return;
+          }
+
+          if (DNSRequestChild* child = actor->AsDNSRequestChild()) {
+            Unused << child->SendCancelDNSRequest(
+                host, trrServer, type, originAttributes, flags, reason);
+          } else if (DNSRequestParent* parent = actor->AsDNSRequestParent()) {
+            Unused << parent->SendCancelDNSRequest(
+                host, trrServer, type, originAttributes, flags, reason);
+          }
+        });
+    SchedulerGroup::Dispatch(TaskCategory::Other, runnable.forget());
+  }
+  return NS_OK;
+}
+
+void DNSRequestSender::StartRequest() {
   // we can only do IPDL on the main thread
   if (!NS_IsMainThread()) {
     SchedulerGroup::Dispatch(
         TaskCategory::Other,
-        NewRunnableMethod("net::DNSRequestChild::StartRequest", this,
-                          &DNSRequestChild::StartRequest));
+        NewRunnableMethod("net::DNSRequestSender::StartRequest", this,
+                          &DNSRequestSender::StartRequest));
     return;
   }
 
-  if (XRE_IsContentProcess()) {
-    mozilla::dom::ContentChild* cc =
-        static_cast<mozilla::dom::ContentChild*>(gNeckoChild->Manager());
-    if (cc->IsShuttingDown()) {
+  if (DNSRequestChild* child = mIPCActor->AsDNSRequestChild()) {
+    if (XRE_IsContentProcess()) {
+      mozilla::dom::ContentChild* cc =
+          static_cast<mozilla::dom::ContentChild*>(gNeckoChild->Manager());
+      if (cc->IsShuttingDown()) {
+        return;
+      }
+
+      // Send request to Parent process.
+      gNeckoChild->SendPDNSRequestConstructor(child, mHost, mTrrServer, mType,
+                                              mOriginAttributes, mFlags);
+    } else if (XRE_IsSocketProcess()) {
+      // DNS resolution is done in the parent process. Send a DNS request to
+      // parent process.
+      MOZ_ASSERT(!nsIOService::UseSocketProcess());
+
+      SocketProcessChild* socketProcessChild =
+          SocketProcessChild::GetSingleton();
+      if (!socketProcessChild->CanSend()) {
+        return;
+      }
+
+      socketProcessChild->SendPDNSRequestConstructor(
+          child, mHost, mTrrServer, mType, mOriginAttributes, mFlags);
+    } else {
+      MOZ_ASSERT(false, "Wrong process");
+      return;
+    }
+  } else if (DNSRequestParent* parent = mIPCActor->AsDNSRequestParent()) {
+    // DNS resolution is done in the socket process. Send a DNS request to
+    // socket process.
+    MOZ_ASSERT(nsIOService::UseSocketProcess());
+
+    RefPtr<DNSRequestParent> requestParent = parent;
+    RefPtr<DNSRequestSender> self = this;
+    auto task = [requestParent, self]() {
+      Unused << SocketProcessParent::GetSingleton()->SendPDNSRequestConstructor(
+          requestParent, self->mHost, self->mTrrServer, self->mType,
+          self->mOriginAttributes, self->mFlags);
+    };
+    if (!gIOService->SocketProcessReady()) {
+      gIOService->CallOrWaitForSocketProcess(std::move(task));
       return;
     }
 
-    // Send request to Parent process.
-    gNeckoChild->SendPDNSRequestConstructor(this, mHost, mTrrServer, mType,
-                                            mOriginAttributes, mFlags);
-  } else if (XRE_IsSocketProcess()) {
-    SocketProcessChild* child = SocketProcessChild::GetSingleton();
-    if (!child->CanSend()) {
-      return;
-    }
-
-    child->SendPDNSRequestConstructor(this, mHost, mTrrServer, mType,
-                                      mOriginAttributes, mFlags);
-  } else {
-    MOZ_ASSERT(false, "Wrong process");
-    return;
+    task();
   }
 }
 
-void DNSRequestChild::CallOnLookupComplete() {
+void DNSRequestSender::CallOnLookupComplete() {
   MOZ_ASSERT(mListener);
   mListener->OnLookupComplete(this, mResultRecord, mResultStatus);
 }
 
-mozilla::ipc::IPCResult DNSRequestChild::RecvLookupCompleted(
-    const DNSRequestResponse& reply) {
+bool DNSRequestSender::OnRecvLookupCompleted(const DNSRequestResponse& reply) {
   MOZ_ASSERT(mListener);
 
   switch (reply.type()) {
@@ -295,7 +335,7 @@ mozilla::ipc::IPCResult DNSRequestChild::RecvLookupCompleted(
     }
     default:
       MOZ_ASSERT_UNREACHABLE("unknown type");
-      return IPC_FAIL_NO_REASON(this);
+      return false;
   }
 
   MOZ_ASSERT(NS_IsMainThread());
@@ -311,41 +351,56 @@ mozilla::ipc::IPCResult DNSRequestChild::RecvLookupCompleted(
     CallOnLookupComplete();
   } else {
     nsCOMPtr<nsIRunnable> event =
-        NewRunnableMethod("net::DNSRequestChild::CallOnLookupComplete", this,
-                          &DNSRequestChild::CallOnLookupComplete);
+        NewRunnableMethod("net::DNSRequestSender::CallOnLookupComplete", this,
+                          &DNSRequestSender::CallOnLookupComplete);
     mTarget->Dispatch(event, NS_DISPATCH_NORMAL);
   }
 
-  Unused << Send__delete__(this);
+  if (DNSRequestChild* child = mIPCActor->AsDNSRequestChild()) {
+    Unused << child->Send__delete__(child);
+  } else if (DNSRequestParent* parent = mIPCActor->AsDNSRequestParent()) {
+    Unused << parent->Send__delete__(parent);
+  }
 
-  return IPC_OK();
+  return true;
 }
 
-void DNSRequestChild::ActorDestroy(ActorDestroyReason why) {
+void DNSRequestSender::OnIPCActorDestroy() {
   // Request is done or destroyed. Remove it from the hash table.
   RefPtr<ChildDNSService> dnsServiceChild =
       dont_AddRef(ChildDNSService::GetSingleton());
   dnsServiceChild->NotifyRequestDone(this);
+
+  mIPCActor = nullptr;
 }
 
 //-----------------------------------------------------------------------------
-// DNSRequestChild::nsISupports
+// DNSRequestChild
 //-----------------------------------------------------------------------------
 
-NS_IMPL_ISUPPORTS(DNSRequestChild, nsICancelable)
+DNSRequestChild::DNSRequestChild(DNSRequestBase* aRequest)
+    : DNSRequestActor(aRequest) {
+  aRequest->SetIPCActor(this);
+}
 
-//-----------------------------------------------------------------------------
-// DNSRequestChild::nsICancelable
-//-----------------------------------------------------------------------------
+mozilla::ipc::IPCResult DNSRequestChild::RecvCancelDNSRequest(
+    const nsCString& hostName, const nsCString& trrServer, const uint16_t& type,
+    const OriginAttributes& originAttributes, const uint32_t& flags,
+    const nsresult& reason) {
+  mDNSRequest->OnRecvCancelDNSRequest(hostName, trrServer, type,
+                                      originAttributes, flags, reason);
+  return IPC_OK();
+}
 
-NS_IMETHODIMP
-DNSRequestChild::Cancel(nsresult reason) {
-  if (CanSend()) {
-    // We can only do IPDL on the main thread
-    nsCOMPtr<nsIRunnable> runnable = new CancelDNSRequestEvent(this, reason);
-    SchedulerGroup::Dispatch(TaskCategory::Other, runnable.forget());
-  }
-  return NS_OK;
+mozilla::ipc::IPCResult DNSRequestChild::RecvLookupCompleted(
+    const DNSRequestResponse& reply) {
+  return mDNSRequest->OnRecvLookupCompleted(reply) ? IPC_OK()
+                                                   : IPC_FAIL_NO_REASON(this);
+}
+
+void DNSRequestChild::ActorDestroy(ActorDestroyReason) {
+  mDNSRequest->OnIPCActorDestroy();
+  mDNSRequest = nullptr;
 }
 
 //------------------------------------------------------------------------------

netwerk/dns/DNSRequestChild.h

@@ -7,50 +7,32 @@
 #ifndef mozilla_net_DNSRequestChild_h
 #define mozilla_net_DNSRequestChild_h
 
+#include "mozilla/net/DNSRequestBase.h"
 #include "mozilla/net/PDNSRequestChild.h"
-#include "nsICancelable.h"
-#include "nsIDNSRecord.h"
-#include "nsIDNSListener.h"
-#include "nsIDNSByTypeRecord.h"
-#include "nsIEventTarget.h"
 
 namespace mozilla {
 namespace net {
 
-class DNSRequestChild final : public PDNSRequestChild, public nsICancelable {
+class DNSRequestChild final : public DNSRequestActor, public PDNSRequestChild {
+ public:
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DNSRequestChild, override)
   friend class PDNSRequestChild;
 
- public:
-  NS_DECL_THREADSAFE_ISUPPORTS
-  NS_DECL_NSICANCELABLE
+  explicit DNSRequestChild(DNSRequestBase* aRequest);
 
-  DNSRequestChild(const nsACString& aHost, const nsACString& aTrrServer,
-                  const uint16_t& aType,
-                  const OriginAttributes& aOriginAttributes,
-                  const uint32_t& aFlags, nsIDNSListener* aListener,
-                  nsIEventTarget* target);
+  bool CanSend() const override { return PDNSRequestChild::CanSend(); }
+  DNSRequestChild* AsDNSRequestChild() override { return this; }
+  DNSRequestParent* AsDNSRequestParent() override { return nullptr; }
 
-  // Sends IPDL request to parent
-  void StartRequest();
-  void CallOnLookupComplete();
-
- protected:
-  friend class CancelDNSRequestEvent;
-  friend class ChildDNSService;
+ private:
   virtual ~DNSRequestChild() = default;
 
+  mozilla::ipc::IPCResult RecvCancelDNSRequest(
+      const nsCString& hostName, const nsCString& trrServer,
+      const uint16_t& type, const OriginAttributes& originAttributes,
+      const uint32_t& flags, const nsresult& reason);
   mozilla::ipc::IPCResult RecvLookupCompleted(const DNSRequestResponse& reply);
   virtual void ActorDestroy(ActorDestroyReason why) override;
-
-  nsCOMPtr<nsIDNSListener> mListener;
-  nsCOMPtr<nsIEventTarget> mTarget;
-  nsCOMPtr<nsIDNSRecord> mResultRecord;
-  nsresult mResultStatus;
-  nsCString mHost;
-  nsCString mTrrServer;
-  uint16_t mType;
-  const OriginAttributes mOriginAttributes;
-  uint16_t mFlags;
 };
 
 }  // namespace net

netwerk/dns/DNSRequestParent.cpp

@@ -5,6 +5,7 @@
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 #include "mozilla/net/DNSRequestParent.h"
+#include "mozilla/net/DNSRequestChild.h"
 #include "nsIDNSService.h"
 #include "nsNetCID.h"
 #include "nsThreadUtils.h"
@@ -18,13 +19,28 @@ using namespace mozilla::ipc;
 namespace mozilla {
 namespace net {
 
-DNSRequestParent::DNSRequestParent() : mFlags(0) {}
+DNSRequestHandler::DNSRequestHandler() : mFlags(0) {}
 
-void DNSRequestParent::DoAsyncResolve(const nsACString& hostname,
-                                      const nsACString& trrServer,
-                                      uint16_t type,
-                                      const OriginAttributes& originAttributes,
-                                      uint32_t flags) {
+//-----------------------------------------------------------------------------
+// DNSRequestHandler::nsISupports
+//-----------------------------------------------------------------------------
+
+NS_IMPL_ISUPPORTS(DNSRequestHandler, nsIDNSListener)
+
+static void SendLookupCompletedHelper(DNSRequestActor* aActor,
+                                      const DNSRequestResponse& aReply) {
+  if (DNSRequestParent* parent = aActor->AsDNSRequestParent()) {
+    Unused << parent->SendLookupCompleted(aReply);
+  } else if (DNSRequestChild* child = aActor->AsDNSRequestChild()) {
+    Unused << child->SendLookupCompleted(aReply);
+  }
+}
+
+void DNSRequestHandler::DoAsyncResolve(const nsACString& hostname,
+                                       const nsACString& trrServer,
+                                       uint16_t type,
+                                       const OriginAttributes& originAttributes,
+                                       uint32_t flags) {
   nsresult rv;
   mFlags = flags;
   nsCOMPtr<nsIDNSService> dns = do_GetService(NS_DNSSERVICE_CONTRACTID, &rv);
@@ -45,12 +61,12 @@ void DNSRequestParent::DoAsyncResolve(const nsACString& hostname,
     }
   }
 
-  if (NS_FAILED(rv) && CanSend()) {
-    Unused << SendLookupCompleted(DNSRequestResponse(rv));
+  if (NS_FAILED(rv) && mIPCActor->CanSend()) {
+    SendLookupCompletedHelper(mIPCActor, DNSRequestResponse(rv));
   }
 }
 
-mozilla::ipc::IPCResult DNSRequestParent::RecvCancelDNSRequest(
+void DNSRequestHandler::OnRecvCancelDNSRequest(
     const nsCString& hostName, const nsCString& aTrrServer,
     const uint16_t& type, const OriginAttributes& originAttributes,
     const uint32_t& flags, const nsresult& reason) {
@@ -68,23 +84,20 @@ mozilla::ipc::IPCResult DNSRequestParent::RecvCancelDNSRequest(
           hostName, aTrrServer, flags, this, reason, originAttributes);
     }
   }
-  return IPC_OK();
 }
 
-//-----------------------------------------------------------------------------
-// DNSRequestParent::nsISupports
-//-----------------------------------------------------------------------------
-
-NS_IMPL_ISUPPORTS(DNSRequestParent, nsIDNSListener)
+bool DNSRequestHandler::OnRecvLookupCompleted(const DNSRequestResponse& reply) {
+  return true;
+}
 
 //-----------------------------------------------------------------------------
 // nsIDNSListener functions
 //-----------------------------------------------------------------------------
 
 NS_IMETHODIMP
-DNSRequestParent::OnLookupComplete(nsICancelable* request, nsIDNSRecord* rec,
-                                   nsresult status) {
-  if (!CanSend()) {
+DNSRequestHandler::OnLookupComplete(nsICancelable* request, nsIDNSRecord* rec,
+                                    nsresult status) {
+  if (!mIPCActor || !mIPCActor->CanSend()) {
     // nothing to do: child probably crashed
     return NS_OK;
   }
@@ -96,7 +109,7 @@ DNSRequestParent::OnLookupComplete(nsICancelable* request, nsIDNSRecord* rec,
     if (txtRec) {
       nsTArray<nsCString> rec;
       txtRec->GetRecords(rec);
-      Unused << SendLookupCompleted(DNSRequestResponse(rec));
+      SendLookupCompletedHelper(mIPCActor, DNSRequestResponse(rec));
       return NS_OK;
     }
 
@@ -112,13 +125,45 @@ DNSRequestParent::OnLookupComplete(nsICancelable* request, nsIDNSRecord* rec,
       array.AppendElement(addr);
     }
 
-    Unused << SendLookupCompleted(DNSRequestResponse(DNSRecord(cname, array)));
+    SendLookupCompletedHelper(mIPCActor,
+                              DNSRequestResponse(DNSRecord(cname, array)));
   } else {
-    Unused << SendLookupCompleted(DNSRequestResponse(status));
+    SendLookupCompletedHelper(mIPCActor, DNSRequestResponse(status));
   }
 
   return NS_OK;
 }
 
+void DNSRequestHandler::OnIPCActorDestroy() { mIPCActor = nullptr; }
+
+//-----------------------------------------------------------------------------
+// DNSRequestParent functions
+//-----------------------------------------------------------------------------
+
+DNSRequestParent::DNSRequestParent(DNSRequestBase* aRequest)
+    : DNSRequestActor(aRequest) {
+  aRequest->SetIPCActor(this);
+}
+
+mozilla::ipc::IPCResult DNSRequestParent::RecvCancelDNSRequest(
+    const nsCString& hostName, const nsCString& trrServer, const uint16_t& type,
+    const OriginAttributes& originAttributes, const uint32_t& flags,
+    const nsresult& reason) {
+  mDNSRequest->OnRecvCancelDNSRequest(hostName, trrServer, type,
+                                      originAttributes, flags, reason);
+  return IPC_OK();
+}
+
+mozilla::ipc::IPCResult DNSRequestParent::RecvLookupCompleted(
+    const DNSRequestResponse& reply) {
+  return mDNSRequest->OnRecvLookupCompleted(reply) ? IPC_OK()
+                                                   : IPC_FAIL_NO_REASON(this);
+}
+
+void DNSRequestParent::ActorDestroy(ActorDestroyReason) {
+  mDNSRequest->OnIPCActorDestroy();
+  mDNSRequest = nullptr;
+}
+
 }  // namespace net
 }  // namespace mozilla

netwerk/dns/DNSRequestParent.h

@@ -7,22 +7,26 @@
 #ifndef mozilla_net_DNSRequestParent_h
 #define mozilla_net_DNSRequestParent_h
 
+#include "mozilla/net/DNSRequestBase.h"
 #include "mozilla/net/PDNSRequestParent.h"
 #include "nsIDNSListener.h"
 
 namespace mozilla {
 namespace net {
 
-class DNSRequestParent : public PDNSRequestParent, public nsIDNSListener {
+class DNSRequestParent : public DNSRequestActor, public PDNSRequestParent {
  public:
-  NS_DECL_ISUPPORTS
-  NS_DECL_NSIDNSLISTENER
+  friend class PDNSRequestParent;
+  NS_INLINE_DECL_THREADSAFE_REFCOUNTING(DNSRequestParent, override)
 
-  DNSRequestParent();
+  explicit DNSRequestParent(DNSRequestBase* aRequest);
 
-  void DoAsyncResolve(const nsACString& hostname, const nsACString& trrServer,
-                      uint16_t type, const OriginAttributes& originAttributes,
-                      uint32_t flags);
+  bool CanSend() const override { return PDNSRequestParent::CanSend(); }
+  DNSRequestChild* AsDNSRequestChild() override { return nullptr; }
+  DNSRequestParent* AsDNSRequestParent() override { return this; }
+
+ private:
+  virtual ~DNSRequestParent() = default;
 
   // Pass args here rather than storing them in the parent; they are only
   // needed if the request is to be canceled.
@@ -30,11 +34,8 @@ class DNSRequestParent : public PDNSRequestParent, public nsIDNSListener {
       const nsCString& hostName, const nsCString& trrServer,
       const uint16_t& type, const OriginAttributes& originAttributes,
       const uint32_t& flags, const nsresult& reason);
-
- private:
-  virtual ~DNSRequestParent() = default;
-
-  uint32_t mFlags;
+  mozilla::ipc::IPCResult RecvLookupCompleted(const DNSRequestResponse& reply);
+  void ActorDestroy(ActorDestroyReason) override;
 };
 
 }  // namespace net

netwerk/dns/PDNSRequest.ipdl

@@ -21,7 +21,7 @@ async refcounted protocol PDNSRequest
 {
   manager PNecko or PSocketProcess;
 
-parent:
+both:
   // constructor in PNecko takes AsyncResolve args that initialize request
 
   // Pass args here rather than storing them in the parent; they are only
@@ -31,7 +31,6 @@ parent:
                          uint32_t flags, nsresult reason);
   async __delete__();
 
-child:
   async LookupCompleted(DNSRequestResponse reply);
 
 };

netwerk/dns/moz.build

@@ -39,6 +39,7 @@ EXPORTS.mozilla.net += [
     'ChildDNSService.h',
     'DNS.h',
     'DNSListenerProxy.h',
+    'DNSRequestBase.h',
     'DNSRequestChild.h',
     'DNSRequestParent.h',
     'IDNBlocklistUtils.h',

netwerk/dns/nsDNSService2.cpp

@@ -10,6 +10,7 @@
 #include "nsIDNSByTypeRecord.h"
 #include "nsICancelable.h"
 #include "nsIPrefBranch.h"
+#include "nsIOService.h"
 #include "nsIXPConnect.h"
 #include "nsProxyRelease.h"
 #include "nsReadableUtils.h"
@@ -39,6 +40,7 @@
 #include "mozilla/net/DNSListenerProxy.h"
 #include "mozilla/Services.h"
 #include "mozilla/StaticPtr.h"
+#include "mozilla/SyncRunnable.h"
 #include "mozilla/TextUtils.h"
 #include "mozilla/Utf8.h"
 
@@ -545,6 +547,18 @@ NS_IMPL_ISUPPORTS(nsDNSService, nsIDNSService, nsPIDNSService, nsIObserver,
 static StaticRefPtr<nsDNSService> gDNSService;
 
 already_AddRefed<nsIDNSService> nsDNSService::GetXPCOMSingleton() {
+  if (nsIOService::UseSocketProcess()) {
+    if (XRE_IsSocketProcess()) {
+      return GetSingleton();
+    }
+
+    if (XRE_IsContentProcess() || XRE_IsParentProcess()) {
+      return ChildDNSService::GetSingleton();
+    }
+
+    return nullptr;
+  }
+
   if (XRE_IsParentProcess()) {
     return GetSingleton();
   }
@@ -557,14 +571,31 @@ already_AddRefed<nsIDNSService> nsDNSService::GetXPCOMSingleton() {
 }
 
 already_AddRefed<nsDNSService> nsDNSService::GetSingleton() {
-  NS_ASSERTION(XRE_IsParentProcess(), "not a parent process");
+  MOZ_ASSERT_IF(nsIOService::UseSocketProcess(), XRE_IsSocketProcess());
+  MOZ_ASSERT_IF(!nsIOService::UseSocketProcess(), XRE_IsParentProcess());
 
   if (!gDNSService) {
-    gDNSService = new nsDNSService();
-    if (NS_SUCCEEDED(gDNSService->Init())) {
-      ClearOnShutdown(&gDNSService);
+    auto initTask = []() {
+      gDNSService = new nsDNSService();
+      if (NS_SUCCEEDED(gDNSService->Init())) {
+        ClearOnShutdown(&gDNSService);
+      } else {
+        gDNSService = nullptr;
+      }
+    };
+
+    if (!NS_IsMainThread()) {
+      // Forward to the main thread synchronously.
+      RefPtr<nsIThread> mainThread = do_GetMainThread();
+      if (!mainThread) {
+        return nullptr;
+      }
+
+      SyncRunnable::DispatchToThread(mainThread,
+                                     new SyncRunnable(NS_NewRunnableFunction(
+                                         "nsDNSService::Init", initTask)));
     } else {
-      gDNSService = nullptr;
+      initTask();
     }
   }
 

netwerk/ipc/NeckoParent.cpp

@@ -615,7 +615,8 @@ bool NeckoParent::DeallocPUDPSocketParent(PUDPSocketParent* actor) {
 already_AddRefed<PDNSRequestParent> NeckoParent::AllocPDNSRequestParent(
     const nsCString& aHost, const nsCString& aTrrServer, const uint16_t& aType,
     const OriginAttributes& aOriginAttributes, const uint32_t& aFlags) {
-  RefPtr<DNSRequestParent> actor = new DNSRequestParent();
+  RefPtr<DNSRequestHandler> handler = new DNSRequestHandler();
+  RefPtr<DNSRequestParent> actor = new DNSRequestParent(handler);
   return actor.forget();
 }
 
@@ -623,8 +624,10 @@ mozilla::ipc::IPCResult NeckoParent::RecvPDNSRequestConstructor(
     PDNSRequestParent* aActor, const nsCString& aHost,
     const nsCString& aTrrServer, const uint16_t& aType,
     const OriginAttributes& aOriginAttributes, const uint32_t& aFlags) {
-  static_cast<DNSRequestParent*>(aActor)->DoAsyncResolve(
-      aHost, aTrrServer, aType, aOriginAttributes, aFlags);
+  RefPtr<DNSRequestParent> actor = static_cast<DNSRequestParent*>(aActor);
+  RefPtr<DNSRequestHandler> handler =
+      actor->GetDNSRequest()->AsDNSRequestHandler();
+  handler->DoAsyncResolve(aHost, aTrrServer, aType, aOriginAttributes, aFlags);
   return IPC_OK();
 }
 

netwerk/ipc/PSocketProcess.ipdl

@@ -63,8 +63,6 @@ parent:
 
   /* tabId is only required for web-proxy support, which isn't always needed */
   async PWebrtcTCPSocket(TabId? tabId);
-  async PDNSRequest(nsCString hostName, nsCString trrServer, uint16_t type,
-                    OriginAttributes originAttributes, uint32_t flags);
   async PChildToParentStream();
   async ObserveHttpActivity(HttpActivityArgs aActivityArgs,
                             uint32_t aActivityType,
@@ -100,6 +98,8 @@ child:
 
 both:
   async PFileDescriptorSet(FileDescriptor fd);
+  async PDNSRequest(nsCString hostName, nsCString trrServer, uint16_t type,
+                    OriginAttributes originAttributes, uint32_t flags);
 };
 
 } // namespace net

netwerk/ipc/SocketProcessChild.cpp

@@ -19,10 +19,14 @@
 #include "mozilla/ipc/ProcessChild.h"
 #include "mozilla/net/AltSvcTransactionChild.h"
 #include "mozilla/net/DNSRequestChild.h"
+#include "mozilla/net/DNSRequestParent.h"
 #include "mozilla/ipc/PChildToParentStreamChild.h"
 #include "mozilla/ipc/PParentToChildStreamChild.h"
 #include "mozilla/Preferences.h"
+#include "mozilla/Telemetry.h"
 #include "nsDebugImpl.h"
+#include "nsHttpConnectionInfo.h"
+#include "nsHttpHandler.h"
 #include "nsIDNSService.h"
 #include "nsIHttpActivityObserver.h"
 #include "nsThreadManager.h"
@@ -352,5 +356,24 @@ SocketProcessChild::AllocPAltSvcTransactionChild(
   return child.forget();
 }
 
+already_AddRefed<PDNSRequestChild> SocketProcessChild::AllocPDNSRequestChild(
+    const nsCString& aHost, const nsCString& aTrrServer, const uint16_t& aType,
+    const OriginAttributes& aOriginAttributes, const uint32_t& aFlags) {
+  RefPtr<DNSRequestHandler> handler = new DNSRequestHandler();
+  RefPtr<DNSRequestChild> actor = new DNSRequestChild(handler);
+  return actor.forget();
+}
+
+mozilla::ipc::IPCResult SocketProcessChild::RecvPDNSRequestConstructor(
+    PDNSRequestChild* aActor, const nsCString& aHost,
+    const nsCString& aTrrServer, const uint16_t& aType,
+    const OriginAttributes& aOriginAttributes, const uint32_t& aFlags) {
+  RefPtr<DNSRequestChild> actor = static_cast<DNSRequestChild*>(aActor);
+  RefPtr<DNSRequestHandler> handler =
+      actor->GetDNSRequest()->AsDNSRequestHandler();
+  handler->DoAsyncResolve(aHost, aTrrServer, aType, aOriginAttributes, aFlags);
+  return IPC_OK();
+}
+
 }  // namespace net
 }  // namespace mozilla

netwerk/ipc/SocketProcessChild.h

@@ -86,6 +86,16 @@ class SocketProcessChild final
 
   bool IsShuttingDown() { return mShuttingDown; }
 
+  already_AddRefed<PDNSRequestChild> AllocPDNSRequestChild(
+      const nsCString& aHost, const nsCString& aTrrServer,
+      const uint16_t& aType, const OriginAttributes& aOriginAttributes,
+      const uint32_t& aFlags);
+  mozilla::ipc::IPCResult RecvPDNSRequestConstructor(
+      PDNSRequestChild* aActor, const nsCString& aHost,
+      const nsCString& aTrrServer, const uint16_t& aType,
+      const OriginAttributes& aOriginAttributes,
+      const uint32_t& aFlags) override;
+
  protected:
   friend class SocketProcessImpl;
   ~SocketProcessChild();

netwerk/ipc/SocketProcessHost.cpp

@@ -7,6 +7,7 @@
 
 #include "nsAppRunner.h"
 #include "nsIObserverService.h"
+#include "nsIOService.h"
 #include "SocketProcessParent.h"
 
 #if defined(XP_LINUX) && defined(MOZ_SANDBOX)

netwerk/ipc/SocketProcessImpl.cpp

@@ -16,6 +16,10 @@
 #  include "mozilla/sandboxTarget.h"
 #endif
 
+#ifdef OS_POSIX
+#  include <unistd.h>  // For sleep().
+#endif
+
 using mozilla::ipc::IOThreadChild;
 
 namespace mozilla {

netwerk/ipc/SocketProcessParent.cpp

@@ -153,7 +153,8 @@ bool SocketProcessParent::DeallocPWebrtcTCPSocketParent(
 already_AddRefed<PDNSRequestParent> SocketProcessParent::AllocPDNSRequestParent(
     const nsCString& aHost, const nsCString& aTrrServer, const uint16_t& aType,
     const OriginAttributes& aOriginAttributes, const uint32_t& aFlags) {
-  RefPtr<DNSRequestParent> actor = new DNSRequestParent();
+  RefPtr<DNSRequestHandler> handler = new DNSRequestHandler();
+  RefPtr<DNSRequestParent> actor = new DNSRequestParent(handler);
   return actor.forget();
 }
 
@@ -161,8 +162,10 @@ mozilla::ipc::IPCResult SocketProcessParent::RecvPDNSRequestConstructor(
     PDNSRequestParent* aActor, const nsCString& aHost,
     const nsCString& aTrrServer, const uint16_t& aType,
     const OriginAttributes& aOriginAttributes, const uint32_t& aFlags) {
-  static_cast<DNSRequestParent*>(aActor)->DoAsyncResolve(
-      aHost, aTrrServer, aType, aOriginAttributes, aFlags);
+  RefPtr<DNSRequestParent> actor = static_cast<DNSRequestParent*>(aActor);
+  RefPtr<DNSRequestHandler> handler =
+      actor->GetDNSRequest()->AsDNSRequestHandler();
+  handler->DoAsyncResolve(aHost, aTrrServer, aType, aOriginAttributes, aFlags);
   return IPC_OK();
 }
 

netwerk/test/unit/socks_client_subprocess.js

@@ -4,6 +4,8 @@
 
 var CC = Components.Constructor;
 
+var dns = Cc["@mozilla.org/network/dns-service;1"].getService(Ci.nsIDNSService);
+
 const BinaryInputStream = CC(
   "@mozilla.org/binaryinputstream;1",
   "nsIBinaryInputStream",