1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
|
// Copyright (c) 2014 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/app/chrome_watcher_command_line_win.h"
#include <stdint.h>
#include <string>
#include "base/command_line.h"
#include "base/files/file_path.h"
#include "base/logging.h"
#include "base/strings/string_number_conversions.h"
#include "base/strings/stringprintf.h"
#include "base/win/win_util.h"
#include "chrome/common/chrome_switches.h"
#include "content/public/common/content_switches.h"
namespace {
const char kMainThreadIdSwitch[] = "main-thread-id";
const char kOnIninitializedEventHandleSwitch[] = "on-initialized-event-handle";
const char kParentHandleSwitch[] = "parent-handle";
void AppendHandleSwitch(const std::string& switch_name,
HANDLE handle,
base::CommandLine* command_line) {
command_line->AppendSwitchASCII(
switch_name, base::UintToString(base::win::HandleToUint32(handle)));
}
uint32_t ReadUintSwitch(const base::CommandLine& command_line,
const std::string& switch_name) {
std::string switch_string = command_line.GetSwitchValueASCII(switch_name);
unsigned int switch_uint = 0;
if (switch_string.empty() ||
!base::StringToUint(switch_string, &switch_uint)) {
DLOG(ERROR) << "Missing or invalid " << switch_name << " argument.";
return 0;
}
return switch_uint;
}
HANDLE ReadHandleFromSwitch(const base::CommandLine& command_line,
const std::string& switch_name) {
return reinterpret_cast<HANDLE>(ReadUintSwitch(command_line, switch_name));
}
} // namespace
ChromeWatcherCommandLineGenerator::ChromeWatcherCommandLineGenerator(
const base::FilePath& chrome_exe) : chrome_exe_(chrome_exe) {
}
ChromeWatcherCommandLineGenerator::~ChromeWatcherCommandLineGenerator() {
}
bool ChromeWatcherCommandLineGenerator::SetOnInitializedEventHandle(
HANDLE on_initialized_event_handle) {
return SetHandle(on_initialized_event_handle, &on_initialized_event_handle_);
}
bool ChromeWatcherCommandLineGenerator::SetParentProcessHandle(
HANDLE parent_process_handle) {
return SetHandle(parent_process_handle, &parent_process_handle_);
}
// Generates a command-line representing this configuration.
base::CommandLine ChromeWatcherCommandLineGenerator::GenerateCommandLine() {
// TODO(chrisha): Get rid of the following function and move the
// implementation here.
return GenerateChromeWatcherCommandLine(
chrome_exe_, parent_process_handle_.Get(), ::GetCurrentThreadId(),
on_initialized_event_handle_.Get());
}
void ChromeWatcherCommandLineGenerator::GetInheritedHandles(
std::vector<HANDLE>* inherited_handles) const {
if (on_initialized_event_handle_.IsValid())
inherited_handles->push_back(on_initialized_event_handle_.Get());
if (parent_process_handle_.IsValid())
inherited_handles->push_back(parent_process_handle_.Get());
}
bool ChromeWatcherCommandLineGenerator::SetHandle(
HANDLE handle, base::win::ScopedHandle* scoped_handle) {
// Create a duplicate handle that is inheritable.
HANDLE proc = ::GetCurrentProcess();
HANDLE new_handle = 0;
if (!::DuplicateHandle(proc, handle, proc, &new_handle, 0, TRUE,
DUPLICATE_SAME_ACCESS)) {
return false;
}
scoped_handle->Set(new_handle);
return true;
}
ChromeWatcherCommandLine::ChromeWatcherCommandLine(
HANDLE on_initialized_event_handle,
HANDLE parent_process_handle,
DWORD main_thread_id)
: on_initialized_event_handle_(on_initialized_event_handle),
parent_process_handle_(parent_process_handle),
main_thread_id_(main_thread_id) {
}
ChromeWatcherCommandLine::~ChromeWatcherCommandLine() {
// If any handles were not taken then die violently.
CHECK(!on_initialized_event_handle_.IsValid() &&
!parent_process_handle_.IsValid())
<< "Handles left untaken.";
}
scoped_ptr<ChromeWatcherCommandLine>
ChromeWatcherCommandLine::InterpretCommandLine(
const base::CommandLine& command_line) {
base::win::ScopedHandle on_initialized_event_handle;
base::win::ScopedHandle parent_process_handle;
DWORD main_thread_id = 0;
// TODO(chrisha): Get rid of the following function and move the
// implementation here.
if (!InterpretChromeWatcherCommandLine(
command_line, &parent_process_handle, &main_thread_id,
&on_initialized_event_handle))
return scoped_ptr<ChromeWatcherCommandLine>();
return scoped_ptr<ChromeWatcherCommandLine>(new ChromeWatcherCommandLine(
on_initialized_event_handle.Take(), parent_process_handle.Take(),
main_thread_id));
}
base::win::ScopedHandle
ChromeWatcherCommandLine::TakeOnInitializedEventHandle() {
return std::move(on_initialized_event_handle_);
}
base::win::ScopedHandle ChromeWatcherCommandLine::TakeParentProcessHandle() {
return std::move(parent_process_handle_);
}
base::CommandLine GenerateChromeWatcherCommandLine(
const base::FilePath& chrome_exe,
HANDLE parent_process,
DWORD main_thread_id,
HANDLE on_initialized_event) {
base::CommandLine command_line(chrome_exe);
command_line.AppendSwitchASCII(switches::kProcessType,
switches::kWatcherProcess);
command_line.AppendSwitchASCII(kMainThreadIdSwitch,
base::UintToString(main_thread_id));
AppendHandleSwitch(kOnIninitializedEventHandleSwitch, on_initialized_event,
&command_line);
AppendHandleSwitch(kParentHandleSwitch, parent_process, &command_line);
return command_line;
}
bool InterpretChromeWatcherCommandLine(
const base::CommandLine& command_line,
base::win::ScopedHandle* parent_process,
DWORD* main_thread_id,
base::win::ScopedHandle* on_initialized_event) {
DCHECK(on_initialized_event);
DCHECK(parent_process);
// For consistency, always close any existing HANDLEs here.
on_initialized_event->Close();
parent_process->Close();
HANDLE parent_handle =
ReadHandleFromSwitch(command_line, kParentHandleSwitch);
HANDLE on_initialized_event_handle =
ReadHandleFromSwitch(command_line, kOnIninitializedEventHandleSwitch);
*main_thread_id = ReadUintSwitch(command_line, kMainThreadIdSwitch);
if (parent_handle) {
// Initial test of the handle, a zero PID indicates invalid handle, or not
// a process handle. In this case, parsing fails and we avoid closing the
// handle.
DWORD process_pid = ::GetProcessId(parent_handle);
if (process_pid == 0) {
DLOG(ERROR) << "Invalid " << kParentHandleSwitch
<< " argument. Can't get parent PID.";
} else {
parent_process->Set(parent_handle);
}
}
if (on_initialized_event_handle) {
DWORD result = ::WaitForSingleObject(on_initialized_event_handle, 0);
if (result == WAIT_FAILED) {
DPLOG(ERROR)
<< "Unexpected error while testing the initialization event.";
} else if (result != WAIT_TIMEOUT) {
DLOG(ERROR) << "Unexpected result while testing the initialization event "
"with WaitForSingleObject: " << result;
} else {
on_initialized_event->Set(on_initialized_event_handle);
}
}
if (!*main_thread_id || !on_initialized_event->IsValid() ||
!parent_process->IsValid()) {
// If one was valid and not the other, free the valid one.
on_initialized_event->Close();
parent_process->Close();
*main_thread_id = 0;
return false;
}
return true;
}
|
