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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 "chrome/browser/extensions/api/messaging/native_process_launcher.h"
#include <windows.h>
#include <stdint.h>
#include "base/command_line.h"
#include "base/logging.h"
#include "base/process/launch.h"
#include "base/process/process.h"
#include "base/strings/string16.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/registry.h"
#include "base/win/scoped_handle.h"
#include "crypto/random.h"
namespace extensions {
const wchar_t kNativeMessagingRegistryKey[] =
L"SOFTWARE\\Google\\Chrome\\NativeMessagingHosts";
namespace {
// Reads path to the native messaging host manifest from the registry. Returns
// false if the path isn't found.
bool GetManifestPathWithFlags(HKEY root_key,
DWORD flags,
const base::string16& host_name,
base::string16* result) {
base::win::RegKey key;
if (key.Open(root_key, kNativeMessagingRegistryKey,
KEY_QUERY_VALUE | flags) != ERROR_SUCCESS ||
key.OpenKey(host_name.c_str(),
KEY_QUERY_VALUE | flags) != ERROR_SUCCESS ||
key.ReadValue(NULL, result) != ERROR_SUCCESS) {
return false;
}
return true;
}
bool GetManifestPath(HKEY root_key,
const base::string16& host_name,
base::string16* result) {
// First check 32-bit registry and then try 64-bit.
return GetManifestPathWithFlags(
root_key, KEY_WOW64_32KEY, host_name, result) ||
GetManifestPathWithFlags(
root_key, KEY_WOW64_64KEY, host_name, result);
}
} // namespace
// static
base::FilePath NativeProcessLauncher::FindManifest(
const std::string& host_name,
bool allow_user_level_hosts,
std::string* error_message) {
base::string16 host_name_wide = base::UTF8ToUTF16(host_name);
// Try to find the key in HKEY_LOCAL_MACHINE and then in HKEY_CURRENT_USER.
base::string16 path_str;
bool found = false;
if (allow_user_level_hosts)
found = GetManifestPath(HKEY_CURRENT_USER, host_name_wide, &path_str);
if (!found)
found = GetManifestPath(HKEY_LOCAL_MACHINE, host_name_wide, &path_str);
if (!found) {
*error_message =
"Native messaging host " + host_name + " is not registered.";
return base::FilePath();
}
base::FilePath manifest_path(path_str);
if (!manifest_path.IsAbsolute()) {
*error_message = "Path to native messaging host manifest must be absolute.";
return base::FilePath();
}
return manifest_path;
}
// static
bool NativeProcessLauncher::LaunchNativeProcess(
const base::CommandLine& command_line,
base::Process* process,
base::File* read_file,
base::File* write_file) {
// Timeout for the IO pipes.
const DWORD kTimeoutMs = 5000;
// Windows will use default buffer size when 0 is passed to
// CreateNamedPipeW().
const DWORD kBufferSize = 0;
if (!command_line.GetProgram().IsAbsolute()) {
LOG(ERROR) << "Native Messaging host path must be absolute.";
return false;
}
uint64_t pipe_name_token;
crypto::RandBytes(&pipe_name_token, sizeof(pipe_name_token));
base::string16 out_pipe_name = base::StringPrintf(
L"\\\\.\\pipe\\chrome.nativeMessaging.out.%llx", pipe_name_token);
base::string16 in_pipe_name = base::StringPrintf(
L"\\\\.\\pipe\\chrome.nativeMessaging.in.%llx", pipe_name_token);
// Create the pipes to read and write from.
base::win::ScopedHandle stdout_pipe(
CreateNamedPipeW(out_pipe_name.c_str(),
PIPE_ACCESS_INBOUND | FILE_FLAG_OVERLAPPED |
FILE_FLAG_FIRST_PIPE_INSTANCE,
PIPE_TYPE_BYTE, 1, kBufferSize, kBufferSize,
kTimeoutMs, NULL));
if (!stdout_pipe.IsValid()) {
LOG(ERROR) << "Failed to create pipe " << out_pipe_name;
return false;
}
base::win::ScopedHandle stdin_pipe(
CreateNamedPipeW(in_pipe_name.c_str(),
PIPE_ACCESS_OUTBOUND | FILE_FLAG_OVERLAPPED |
FILE_FLAG_FIRST_PIPE_INSTANCE,
PIPE_TYPE_BYTE, 1, kBufferSize, kBufferSize,
kTimeoutMs, NULL));
if (!stdin_pipe.IsValid()) {
LOG(ERROR) << "Failed to create pipe " << in_pipe_name;
return false;
}
DWORD comspec_length = ::GetEnvironmentVariable(L"COMSPEC", NULL, 0);
if (comspec_length == 0) {
LOG(ERROR) << "COMSPEC is not set";
return false;
}
std::unique_ptr<wchar_t[]> comspec(new wchar_t[comspec_length]);
::GetEnvironmentVariable(L"COMSPEC", comspec.get(), comspec_length);
base::string16 command_line_string = command_line.GetCommandLineString();
base::string16 command = base::StringPrintf(
L"%ls /c %ls < %ls > %ls", comspec.get(), command_line_string.c_str(),
in_pipe_name.c_str(), out_pipe_name.c_str());
base::LaunchOptions options;
options.start_hidden = true;
options.current_directory = command_line.GetProgram().DirName();
base::Process cmd_process = base::LaunchProcess(command.c_str(), options);
if (!cmd_process.IsValid()) {
LOG(ERROR) << "Error launching process "
<< command_line.GetProgram().MaybeAsASCII();
return false;
}
bool stdout_connected = ConnectNamedPipe(stdout_pipe.Get(), NULL) ?
TRUE : GetLastError() == ERROR_PIPE_CONNECTED;
bool stdin_connected = ConnectNamedPipe(stdin_pipe.Get(), NULL) ?
TRUE : GetLastError() == ERROR_PIPE_CONNECTED;
if (!stdout_connected || !stdin_connected) {
cmd_process.Terminate(0, false);
LOG(ERROR) << "Failed to connect IO pipes when starting "
<< command_line.GetProgram().MaybeAsASCII();
return false;
}
*process = std::move(cmd_process);
*read_file = base::File::CreateForAsyncHandle(stdout_pipe.Take());
*write_file = base::File::CreateForAsyncHandle(stdin_pipe.Take());
return true;
}
} // namespace extensions
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