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| 1 // Copyright (c) 2014 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. |
| 4 |
| 5 #include "components/browser_watcher/watcher_client_win.h" |
| 6 |
| 7 #include <windows.h> |
| 8 |
| 9 #include "base/path_service.h" |
| 10 #include "base/process/launch.h" |
| 11 #include "base/strings/string16.h" |
| 12 #include "base/strings/stringprintf.h" |
| 13 #include "base/strings/utf_string_conversions.h" |
| 14 #include "base/win/scoped_handle.h" |
| 15 #include "base/win/scoped_process_information.h" |
| 16 #include "base/win/startup_information.h" |
| 17 #include "base/win/windows_version.h" |
| 18 #include "components/browser_watcher/watcher_main_win.h" |
| 19 |
| 20 namespace browser_watcher { |
| 21 |
| 22 namespace { |
| 23 |
| 24 base::win::ScopedHandle OpenOwnProcessInheritable() { |
| 25 return base::win::ScopedHandle( |
| 26 ::OpenProcess(SYNCHRONIZE | PROCESS_QUERY_INFORMATION, |
| 27 TRUE, // Ineritable handle. |
| 28 base::GetCurrentProcId())); |
| 29 } |
| 30 |
| 31 void AddHandleArgument(base::ProcessHandle handle, |
| 32 base::CommandLine* cmd_line) { |
| 33 DCHECK(cmd_line); |
| 34 |
| 35 cmd_line->AppendSwitchASCII("parent-handle", |
| 36 base::StringPrintf("%d", handle)); |
| 37 } |
| 38 |
| 39 } // namespace |
| 40 |
| 41 const base::FilePath::CharType kWatcherDll[] = |
| 42 FILE_PATH_LITERAL("chrome_watcher.dll"); |
| 43 const char kWatcherDLLEntrypoint[] = "WatcherMain"; |
| 44 |
| 45 WatcherClient::WatcherClient(const base::CommandLine& base_command_line) : |
| 46 use_legacy_launch_(base::win::GetVersion() < base::win::VERSION_VISTA), |
| 47 base_command_line_(base_command_line), |
| 48 process_(base::kNullProcessHandle) { |
| 49 } |
| 50 |
| 51 base::win::ScopedHandle WatcherClient::LaunchWatcherProcess( |
| 52 const base::CommandLine& cmd_line, base::ProcessHandle handle) { |
| 53 base::HandlesToInheritVector to_inherit; |
| 54 base::LaunchOptions options; |
| 55 options.start_hidden = true; |
| 56 if (use_legacy_launch_) { |
| 57 // Launch the child process inheriting all handles on XP. |
| 58 options.inherit_handles = true; |
| 59 } else { |
| 60 // Launch the child process inheriting only |handle| on |
| 61 // Vista and better. |
| 62 to_inherit.push_back(handle); |
| 63 options.handles_to_inherit = &to_inherit; |
| 64 } |
| 65 |
| 66 base::ProcessHandle process = base::kNullProcessHandle; |
| 67 base::LaunchProcess(cmd_line, options, &process); |
| 68 return base::win::ScopedHandle(process); |
| 69 } |
| 70 |
| 71 void WatcherClient::LaunchWatcher() { |
| 72 DCHECK(!process_.IsValid()); |
| 73 |
| 74 // Build the command line for the watcher process. |
| 75 base::win::ScopedHandle self(OpenOwnProcessInheritable()); |
| 76 DCHECK(self.IsValid()); |
| 77 base::CommandLine cmd_line(base_command_line_); |
| 78 AddHandleArgument(self.Get(), &cmd_line); |
| 79 |
| 80 // Launch it. |
| 81 process_ = LaunchWatcherProcess(cmd_line, self.Get()); |
| 82 } |
| 83 |
| 84 } // namespace browser_watcher |
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