The Tor Browser: ipc/glue/Transport

Incorporate requested changes from Mozilla in review:
https://bugzilla.mozilla.org/show_bug.cgi?id=1123480#c6

     1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-

     2  * vim: sw=2 ts=8 et :

     3  */

     4 /* This Source Code Form is subject to the terms of the Mozilla Public

     5  * License, v. 2.0. If a copy of the MPL was not distributed with this

     6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     8 #include "base/message_loop.h"

     9 #include "chrome/common/child_process_info.h"

    11 #include "mozilla/ipc/Transport.h"

    13 using namespace base;

    14 using namespace std;

    16 namespace mozilla {

    17 namespace ipc {

    19 bool

    20 CreateTransport(ProcessHandle aProcOne, ProcessHandle /*unused*/,

    21                 TransportDescriptor* aOne, TransportDescriptor* aTwo)

    22 {

    23   // This id is used to name the IPC pipe.  The pointer passed to this

    24   // function isn't significant.

    25   wstring id = ChildProcessInfo::GenerateRandomChannelID(aOne);

    26   // Use MODE_SERVER to force creation of the pipe

    27   Transport t(id, Transport::MODE_SERVER, nullptr);

    28   HANDLE serverPipe = t.GetServerPipeHandle();

    29   if (!serverPipe) {

    30     return false;

    31   }

    33   // NB: we create the server pipe immediately, instead of just

    34   // grabbing an ID, on purpose.  In the current setup, the client

    35   // needs to connect to an existing server pipe, so to prevent race

    36   // conditions, we create the server side here and then dup it to the

    37   // eventual server process.

    38   HANDLE serverDup;

    39   DWORD access = 0;

    40   DWORD options = DUPLICATE_SAME_ACCESS;

    41   if (!DuplicateHandle(GetCurrentProcess(), serverPipe, aProcOne,

    42                        &serverDup,

    43                        access,

    44                        FALSE/*not inheritable*/,

    45                        options)) {

    46     return false;

    47   }

    49   aOne->mPipeName = aTwo->mPipeName = id;

    50   aOne->mServerPipe = serverDup;

    51   aTwo->mServerPipe = INVALID_HANDLE_VALUE;

    52   return true;

    53 }

    55 Transport*

    56 OpenDescriptor(const TransportDescriptor& aTd, Transport::Mode aMode)

    57 {

    58   return new Transport(aTd.mPipeName, aTd.mServerPipe, aMode, nullptr);

    59 }

    61 Transport*

    62 OpenDescriptor(const FileDescriptor& aFd, Transport::Mode aMode)

    63 {

    64   NS_NOTREACHED("Not implemented!");

    65   return nullptr;

    66 }

    68 void

    69 CloseDescriptor(const TransportDescriptor& aTd)

    70 {

    71   CloseHandle(aTd.mServerPipe);

    72 }

    74 } // namespace ipc

    75 } // namespace mozilla

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