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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 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/. */
#include "base/message_loop.h"
#include "mozilla/ipc/Transport.h"
#include "mozilla/ipc/ProtocolUtils.h"
using base::ProcessHandle;
namespace mozilla {
namespace ipc {
nsresult CreateTransport(base::ProcessId aProcIdOne, TransportDescriptor* aOne,
TransportDescriptor* aTwo) {
auto id = IPC::Channel::GenerateVerifiedChannelID();
// Use MODE_SERVER to force creation of the pipe
Transport t(id, Transport::MODE_SERVER, nullptr);
HANDLE serverPipe = t.GetServerPipeHandle();
if (!serverPipe) {
return NS_ERROR_TRANSPORT_INIT;
}
// NB: we create the server pipe immediately, instead of just
// grabbing an ID, on purpose. In the current setup, the client
// needs to connect to an existing server pipe, so to prevent race
// conditions, we create the server side here. When we send the pipe
// to the server, we DuplicateHandle it to the server process to give it
// access.
HANDLE serverDup;
DWORD access = 0;
DWORD options = DUPLICATE_SAME_ACCESS;
if (!DuplicateHandle(serverPipe, base::GetCurrentProcId(), &serverDup, access,
options)) {
return NS_ERROR_DUPLICATE_HANDLE;
}
aOne->mPipeName = aTwo->mPipeName = id;
aOne->mServerPipeHandle = serverDup;
aOne->mDestinationProcessId = aProcIdOne;
aTwo->mServerPipeHandle = INVALID_HANDLE_VALUE;
aTwo->mDestinationProcessId = 0;
return NS_OK;
}
HANDLE
TransferHandleToProcess(HANDLE source, base::ProcessId pid) {
// At this point we're sending the handle to another process.
if (source == INVALID_HANDLE_VALUE) {
return source;
}
HANDLE handleDup;
DWORD access = 0;
DWORD options = DUPLICATE_SAME_ACCESS;
bool ok = DuplicateHandle(source, pid, &handleDup, access, options);
if (!ok) {
return nullptr;
}
// Now close our own copy of the handle (we're supposed to be transferring,
// not copying).
CloseHandle(source);
return handleDup;
}
UniquePtr<Transport> OpenDescriptor(const TransportDescriptor& aTd,
Transport::Mode aMode) {
if (aTd.mServerPipeHandle != INVALID_HANDLE_VALUE) {
MOZ_RELEASE_ASSERT(aTd.mDestinationProcessId == base::GetCurrentProcId());
}
return MakeUnique<Transport>(aTd.mPipeName, aTd.mServerPipeHandle, aMode,
nullptr);
}
UniquePtr<Transport> OpenDescriptor(const FileDescriptor& aFd,
Transport::Mode aMode) {
MOZ_ASSERT_UNREACHABLE("Not implemented!");
return nullptr;
}
TransportDescriptor DuplicateDescriptor(const TransportDescriptor& aTd) {
// We're duplicating this handle in our own process for bookkeeping purposes.
if (aTd.mServerPipeHandle == INVALID_HANDLE_VALUE) {
return aTd;
}
HANDLE serverDup;
DWORD access = 0;
DWORD options = DUPLICATE_SAME_ACCESS;
bool ok = DuplicateHandle(aTd.mServerPipeHandle, base::GetCurrentProcId(),
&serverDup, access, options);
if (!ok) {
AnnotateSystemError();
}
MOZ_RELEASE_ASSERT(ok);
TransportDescriptor desc = aTd;
desc.mServerPipeHandle = serverDup;
return desc;
}
void CloseDescriptor(const TransportDescriptor& aTd) {
// We're closing our own local copy of the pipe.
CloseHandle(aTd.mServerPipeHandle);
}
} // namespace ipc
} // namespace mozilla
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