gecko-dev/dom/plugins/ipc/PluginProcessParent.cpp

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*-
 * vim: sw=2 ts=4 et :
 * 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/. */

#include "mozilla/plugins/PluginProcessParent.h"

#include "base/string_util.h"
#include "base/process_util.h"

#include "nsAppDirectoryServiceDefs.h"
#include "nsDirectoryServiceDefs.h"
#include "nsIProperties.h"
#include "nsServiceManagerUtils.h"

#include "mozilla/ipc/BrowserProcessSubThread.h"
#include "mozilla/plugins/PluginMessageUtils.h"
#include "mozilla/Telemetry.h"
#include "nsThreadUtils.h"

using std::string;
using std::vector;

using mozilla::ipc::BrowserProcessSubThread;
using mozilla::ipc::GeckoChildProcessHost;
using mozilla::plugins::LaunchCompleteTask;
using mozilla::plugins::PluginProcessParent;

#ifdef XP_WIN
PluginProcessParent::PidSet* PluginProcessParent::sPidSet = nullptr;
#endif

PluginProcessParent::PluginProcessParent(const std::string& aPluginFilePath)
    : GeckoChildProcessHost(GeckoProcessType_Plugin),
      mPluginFilePath(aPluginFilePath),
      mTaskFactory(this),
      mMainMsgLoop(MessageLoop::current())
#ifdef XP_WIN
      ,
      mChildPid(0)
#endif
{
}

PluginProcessParent::~PluginProcessParent() {
#ifdef XP_WIN
  if (sPidSet && mChildPid) {
    sPidSet->RemoveEntry(mChildPid);
    if (sPidSet->IsEmpty()) {
      delete sPidSet;
      sPidSet = nullptr;
    }
  }
#endif
}

bool PluginProcessParent::Launch(
    mozilla::UniquePtr<LaunchCompleteTask> aLaunchCompleteTask,
    int32_t aSandboxLevel, bool aIsSandboxLoggingEnabled) {
#if (defined(XP_WIN) || defined(XP_MACOSX)) && defined(MOZ_SANDBOX)
  // At present, the Mac Flash plugin sandbox does not support different
  // levels and is enabled via a boolean pref or environment variable.
  // On Mac, when |aSandboxLevel| is positive, we enable the sandbox.
#  if defined(XP_WIN)
  mSandboxLevel = aSandboxLevel;

  // The sandbox process sometimes needs read access to the plugin file.
  if (aSandboxLevel >= 3) {
    std::wstring pluginFile(
        NS_ConvertUTF8toUTF16(mPluginFilePath.c_str()).get());
    mAllowedFilesRead.push_back(pluginFile);
  }
#  endif  // XP_WIN
#else
  if (aSandboxLevel != 0) {
    MOZ_ASSERT(false,
               "Can't enable an NPAPI process sandbox for platform/build.");
  }
#endif

  mLaunchCompleteTask = std::move(aLaunchCompleteTask);

  vector<string> args;
  args.push_back(MungePluginDsoPath(mPluginFilePath));

#if defined(XP_MACOSX) && defined(MOZ_SANDBOX)
  if (aSandboxLevel > 0) {
    args.push_back("-flashSandboxLevel");
    args.push_back(std::to_string(aSandboxLevel));
    if (aIsSandboxLoggingEnabled) {
      args.push_back("-flashSandboxLogging");
    }
  }
#elif defined(XP_WIN) && defined(MOZ_SANDBOX)
  nsresult rv;
  nsCOMPtr<nsIProperties> dirSvc =
      do_GetService(NS_DIRECTORY_SERVICE_CONTRACTID, &rv);
  if (NS_FAILED(rv)) {
    MOZ_ASSERT(false, "Failed to get directory service.");
    return false;
  }

  nsCOMPtr<nsIFile> dir;
  rv = dirSvc->Get(NS_APP_PLUGIN_PROCESS_TEMP_DIR, NS_GET_IID(nsIFile),
                   getter_AddRefs(dir));
  if (NS_FAILED(rv)) {
    NS_WARNING("Failed to get plugin process temp directory.");
    return false;
  }

  nsAutoString tempDir;
  MOZ_ALWAYS_SUCCEEDS(dir->GetPath(tempDir));
  args.push_back(NS_ConvertUTF16toUTF8(tempDir).get());

  rv =
      dirSvc->Get(NS_WIN_APPDATA_DIR, NS_GET_IID(nsIFile), getter_AddRefs(dir));
  if (NS_FAILED(rv)) {
    NS_WARNING("Failed to get appdata directory.");
    return false;
  }

  nsAutoString appdataDir;
  MOZ_ALWAYS_SUCCEEDS(dir->GetPath(appdataDir));
  appdataDir.Append(L"\\Adobe\\");
  args.push_back(NS_ConvertUTF16toUTF8(appdataDir).get());
#endif

  bool result = AsyncLaunch(args);
  if (!result) {
    mLaunchCompleteTask = nullptr;
  }
  return result;
}

void PluginProcessParent::Delete() {
  MessageLoop* currentLoop = MessageLoop::current();
  MessageLoop* ioLoop = XRE_GetIOMessageLoop();

  if (currentLoop == ioLoop) {
    delete this;
    return;
  }

  ioLoop->PostTask(
      NewNonOwningRunnableMethod("plugins::PluginProcessParent::Delete", this,
                                 &PluginProcessParent::Delete));
}

/**
 * This function exists so that we may provide an additional level of
 * indirection between the task being posted to main event loop (a
 * RunnableMethod) and the launch complete task itself. This is needed
 * for cases when both WaitUntilConnected or OnChannel* race to invoke the
 * task.
 */
void PluginProcessParent::RunLaunchCompleteTask() {
  if (mLaunchCompleteTask) {
    mLaunchCompleteTask->Run();
    mLaunchCompleteTask = nullptr;
  }
}

bool PluginProcessParent::WaitUntilConnected(int32_t aTimeoutMs) {
  bool result = GeckoChildProcessHost::WaitUntilConnected(aTimeoutMs);
  if (mLaunchCompleteTask) {
    if (result) {
      mLaunchCompleteTask->SetLaunchSucceeded();
    }
    RunLaunchCompleteTask();
  }
  return result;
}

void PluginProcessParent::OnChannelConnected(int32_t peer_pid) {
#ifdef XP_WIN
  mChildPid = static_cast<uint32_t>(peer_pid);
  if (!sPidSet) {
    sPidSet = new PluginProcessParent::PidSet();
  }
  sPidSet->PutEntry(mChildPid);
#endif

  GeckoChildProcessHost::OnChannelConnected(peer_pid);
}

void PluginProcessParent::OnChannelError() {
  GeckoChildProcessHost::OnChannelError();
}

bool PluginProcessParent::IsConnected() {
  mozilla::MonitorAutoLock lock(mMonitor);
  return mProcessState == PROCESS_CONNECTED;
}

bool PluginProcessParent::IsPluginProcessId(base::ProcessId procId) {
#ifdef XP_WIN
  MOZ_ASSERT(XRE_IsParentProcess());
  return sPidSet && sPidSet->Contains(static_cast<uint32_t>(procId));
#else
  NS_ERROR("IsPluginProcessId not available on this platform.");
  return false;
#endif
}