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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "remoting/host/win/worker_process_launcher.h"
#include <windows.h>
#include <sddl.h>
#include <limits>
#include "base/base_switches.h"
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/logging.h"
#include "base/single_thread_task_runner.h"
#include "base/process_util.h"
#include "base/rand_util.h"
#include "base/stringprintf.h"
#include "base/utf_string_conversions.h"
#include "base/win/scoped_handle.h"
#include "ipc/ipc_channel_proxy.h"
#include "ipc/ipc_message.h"
using base::win::ScopedHandle;
namespace {
// Match the pipe name prefix used by Chrome IPC channels so that the client
// could use Chrome IPC APIs instead of connecting manually.
const char kChromePipeNamePrefix[] = "\\\\.\\pipe\\chrome.";
} // namespace
namespace remoting {
WorkerProcessLauncher::Delegate::~Delegate() {
}
WorkerProcessLauncher::WorkerProcessLauncher(
Delegate* delegate,
const base::Closure& stopped_callback,
scoped_refptr<base::SingleThreadTaskRunner> main_task_runner,
scoped_refptr<base::SingleThreadTaskRunner> ipc_task_runner)
: Stoppable(main_task_runner, stopped_callback),
delegate_(delegate),
main_task_runner_(main_task_runner),
ipc_task_runner_(ipc_task_runner) {
}
WorkerProcessLauncher::~WorkerProcessLauncher() {
DCHECK(main_task_runner_->BelongsToCurrentThread());
}
void WorkerProcessLauncher::Start(const std::string& pipe_sddl) {
DCHECK(main_task_runner_->BelongsToCurrentThread());
DCHECK(ipc_channel_.get() == NULL);
DCHECK(!pipe_.IsValid());
DCHECK(!process_exit_event_.IsValid());
DCHECK(process_watcher_.GetWatchedObject() == NULL);
std::string channel_name = GenerateRandomChannelId();
if (CreatePipeForIpcChannel(channel_name, pipe_sddl, &pipe_)) {
// Wrap the pipe into an IPC channel.
ipc_channel_.reset(new IPC::ChannelProxy(
IPC::ChannelHandle(pipe_),
IPC::Channel::MODE_SERVER,
this,
ipc_task_runner_));
// Launch the process and attach an object watcher to the returned process
// handle so that we get notified if the process terminates.
if (delegate_->DoLaunchProcess(channel_name, &process_exit_event_)) {
if (process_watcher_.StartWatching(process_exit_event_, this)) {
return;
}
delegate_->DoKillProcess(CONTROL_C_EXIT);
}
}
Stop();
}
void WorkerProcessLauncher::Send(IPC::Message* message) {
DCHECK(main_task_runner_->BelongsToCurrentThread());
ipc_channel_->Send(message);
}
void WorkerProcessLauncher::OnObjectSignaled(HANDLE object) {
DCHECK(main_task_runner_->BelongsToCurrentThread());
DCHECK(process_watcher_.GetWatchedObject() == NULL);
Stop();
}
bool WorkerProcessLauncher::OnMessageReceived(const IPC::Message& message) {
DCHECK(main_task_runner_->BelongsToCurrentThread());
DCHECK(ipc_channel_.get() != NULL);
DCHECK(pipe_.IsValid());
DCHECK(process_exit_event_.IsValid());
return delegate_->OnMessageReceived(message);
}
void WorkerProcessLauncher::OnChannelConnected(int32 peer_pid) {
DCHECK(main_task_runner_->BelongsToCurrentThread());
DCHECK(ipc_channel_.get() != NULL);
DCHECK(pipe_.IsValid());
DCHECK(process_exit_event_.IsValid());
// Get the actual peer's PID (i.e. reported by the OS) instead of the PID
// reported by the peer itself (|peer_pid|).
DWORD actual_peer_pid;
if (!GetNamedPipeClientProcessId(pipe_, &actual_peer_pid)) {
LOG_GETLASTERROR(ERROR) << "Failed to query the peer's PID";
Stop();
return;
}
delegate_->OnChannelConnected(actual_peer_pid);
}
void WorkerProcessLauncher::OnChannelError() {
DCHECK(main_task_runner_->BelongsToCurrentThread());
DCHECK(ipc_channel_.get() != NULL);
DCHECK(pipe_.IsValid());
DCHECK(process_exit_event_.IsValid());
Stop();
}
void WorkerProcessLauncher::DoStop() {
DCHECK(main_task_runner_->BelongsToCurrentThread());
ipc_channel_.reset();
pipe_.Close();
// Kill the process if it has been started already.
if (process_watcher_.GetWatchedObject() != NULL) {
delegate_->DoKillProcess(CONTROL_C_EXIT);
return;
}
DCHECK(ipc_channel_.get() == NULL);
DCHECK(!pipe_.IsValid());
DCHECK(process_watcher_.GetWatchedObject() == NULL);
process_exit_event_.Close();
CompleteStopping();
}
// Creates the server end of the Chromoting IPC channel.
bool WorkerProcessLauncher::CreatePipeForIpcChannel(
const std::string& channel_name,
const std::string& pipe_sddl,
ScopedHandle* pipe_out) {
// Create security descriptor for the channel.
SECURITY_ATTRIBUTES security_attributes;
security_attributes.nLength = sizeof(security_attributes);
security_attributes.bInheritHandle = FALSE;
ULONG security_descriptor_length = 0;
if (!ConvertStringSecurityDescriptorToSecurityDescriptor(
UTF8ToUTF16(pipe_sddl).c_str(),
SDDL_REVISION_1,
reinterpret_cast<PSECURITY_DESCRIPTOR*>(
&security_attributes.lpSecurityDescriptor),
&security_descriptor_length)) {
LOG_GETLASTERROR(ERROR) <<
"Failed to create a security descriptor for the Chromoting IPC channel";
return false;
}
// Convert the channel name to the pipe name.
std::string pipe_name(kChromePipeNamePrefix);
pipe_name.append(channel_name);
// Create the server end of the pipe. This code should match the code in
// IPC::Channel with exception of passing a non-default security descriptor.
base::win::ScopedHandle pipe;
pipe.Set(CreateNamedPipe(
UTF8ToUTF16(pipe_name).c_str(),
PIPE_ACCESS_DUPLEX | FILE_FLAG_OVERLAPPED | FILE_FLAG_FIRST_PIPE_INSTANCE,
PIPE_TYPE_BYTE | PIPE_READMODE_BYTE,
1,
IPC::Channel::kReadBufferSize,
IPC::Channel::kReadBufferSize,
5000,
&security_attributes));
if (!pipe.IsValid()) {
LOG_GETLASTERROR(ERROR) <<
"Failed to create the server end of the Chromoting IPC channel";
LocalFree(security_attributes.lpSecurityDescriptor);
return false;
}
LocalFree(security_attributes.lpSecurityDescriptor);
*pipe_out = pipe.Pass();
return true;
}
// N.B. Copied from src/content/common/child_process_host_impl.cc
std::string WorkerProcessLauncher::GenerateRandomChannelId() {
return base::StringPrintf("%d.%p.%d",
base::GetCurrentProcId(), this,
base::RandInt(0, std::numeric_limits<int>::max()));
}
} // namespace remoting
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