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
|
// Copyright 2020 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/390223051): Remove C-library calls to fix the errors.
#pragma allow_unsafe_libc_calls
#endif
#include "headless/lib/browser/headless_browser_main_parts.h"
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include "base/files/file_descriptor_watcher_posix.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/logging.h"
#include "base/memory/scoped_refptr.h"
#include "base/no_destructor.h"
#include "base/posix/eintr_wrapper.h"
#include "build/build_config.h"
#include "build/config/linux/dbus/buildflags.h"
#include "content/public/browser/browser_task_traits.h"
#include "content/public/browser/browser_thread.h"
#include "headless/lib/browser/headless_browser_impl.h"
#if BUILDFLAG(IS_LINUX)
#include "base/command_line.h"
#include "components/os_crypt/sync/key_storage_config_linux.h"
#include "components/os_crypt/sync/os_crypt.h"
#include "headless/public/switches.h"
#if BUILDFLAG(USE_DBUS)
#include "device/bluetooth/dbus/bluez_dbus_manager.h"
#endif
#endif // BUILDFLAG(IS_LINUX)
namespace headless {
namespace {
int g_read_fd = 0;
int g_write_fd = 0;
bool CreatePipe() {
CHECK(!g_read_fd);
CHECK(!g_write_fd);
int pipe_fd[2];
int result = pipe(pipe_fd);
if (result < 0) {
PLOG(ERROR) << "Could not create signal pipe";
return false;
}
g_read_fd = pipe_fd[0];
g_write_fd = pipe_fd[1];
return true;
}
class BrowserShutdownHandler {
public:
typedef base::OnceCallback<void(int)> ShutdownCallback;
BrowserShutdownHandler(const BrowserShutdownHandler&) = delete;
BrowserShutdownHandler& operator=(const BrowserShutdownHandler&) = delete;
static void Install(ShutdownCallback shutdown_callback) {
GetInstance().Init(std::move(shutdown_callback));
// We need to handle SIGTERM, because that is how many POSIX-based distros
// ask processes to quit gracefully at shutdown time.
struct sigaction action;
memset(&action, 0, sizeof(action));
action.sa_handler = SIGTERMHandler;
PCHECK(sigaction(SIGTERM, &action, nullptr) == 0);
// Also handle SIGINT - when the user terminates the browser via Ctrl+C. If
// the browser process is being debugged, GDB will catch the SIGINT first.
action.sa_handler = SIGINTHandler;
PCHECK(sigaction(SIGINT, &action, nullptr) == 0);
// And SIGHUP, for when the terminal disappears. On shutdown, many Linux
// distros send SIGHUP, SIGTERM, and then SIGKILL.
action.sa_handler = SIGHUPHandler;
PCHECK(sigaction(SIGHUP, &action, nullptr) == 0);
}
private:
friend class base::NoDestructor<BrowserShutdownHandler>;
BrowserShutdownHandler() = default;
~BrowserShutdownHandler() = default;
static BrowserShutdownHandler& GetInstance() {
static base::NoDestructor<BrowserShutdownHandler> instance;
return *instance;
}
void Init(ShutdownCallback shutdown_callback) {
shutdown_callback_ = std::move(shutdown_callback);
// We cannot just PostTask from a signal handler, so route the signal
// through a pipe.
CHECK(CreatePipe());
file_descriptor_watcher_controller_ =
base::FileDescriptorWatcher::WatchReadable(
g_read_fd,
base::BindRepeating(
&BrowserShutdownHandler::OnFileCanReadWithoutBlocking,
base::Unretained(this)));
}
// This is called whenever data is available in |g_read_fd|.
void OnFileCanReadWithoutBlocking() {
int pipe_data;
if (HANDLE_EINTR(read(g_read_fd, &pipe_data, sizeof(pipe_data))) > 0) {
Shutdown(pipe_data);
}
}
void Shutdown(int signal) {
if (shutdown_callback_) {
int exit_code = 0x80u + signal;
std::move(shutdown_callback_).Run(exit_code);
}
}
static void SIGHUPHandler(int signal) {
RAW_CHECK(signal == SIGHUP);
ShutdownHandler(signal);
}
static void SIGINTHandler(int signal) {
RAW_CHECK(signal == SIGINT);
ShutdownHandler(signal);
}
static void SIGTERMHandler(int signal) {
RAW_CHECK(signal == SIGTERM);
ShutdownHandler(signal);
}
static void ShutdownHandler(int signal) {
// Reinstall the default handler. We have only one shot at graceful
// shutdown.
struct sigaction action;
memset(&action, 0, sizeof(action));
action.sa_handler = SIG_DFL;
RAW_CHECK(sigaction(signal, &action, nullptr) == 0);
// Send signal number through the pipe.
int pipe_data = signal;
std::ignore = write(g_write_fd, &pipe_data, sizeof(pipe_data));
}
ShutdownCallback shutdown_callback_;
std::unique_ptr<base::FileDescriptorWatcher::Controller>
file_descriptor_watcher_controller_;
};
} // namespace
#if BUILDFLAG(IS_LINUX)
constexpr char kProductName[] = "HeadlessChrome";
#endif
void HeadlessBrowserMainParts::PostCreateMainMessageLoop() {
BrowserShutdownHandler::Install(base::BindOnce(
&HeadlessBrowserImpl::ShutdownWithExitCode, browser_->GetWeakPtr()));
#if BUILDFLAG(IS_LINUX)
#if BUILDFLAG(USE_DBUS)
bluez::BluezDBusManager::Initialize(/*system_bus=*/nullptr);
#endif
// Set up crypt config. This needs to be done before anything starts the
// network service, as the raw encryption key needs to be shared with the
// network service for encrypted cookie storage.
std::unique_ptr<os_crypt::Config> config =
std::make_unique<os_crypt::Config>();
// Forward to os_crypt the flag to use a specific password store.
config->store = base::CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
switches::kPasswordStore);
// Use a default product name
config->product_name = kProductName;
// OSCrypt can be disabled in a special settings file, but headless doesn't
// need to support that.
config->should_use_preference = false;
config->user_data_path = base::FilePath();
OSCrypt::SetConfig(std::move(config));
#endif // BUILDFLAG(IS_LINUX)
}
} // namespace headless
|
