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
215
216
|
/*
* Copyright (c) 2018-2021, Andreas Kling <kling@serenityos.org>
*
* SPDX-License-Identifier: BSD-2-Clause
*/
#include "Service.h"
#include <AK/Assertions.h>
#include <AK/ByteBuffer.h>
#include <AK/Debug.h>
#include <LibCore/ConfigFile.h>
#include <LibCore/Event.h>
#include <LibCore/EventLoop.h>
#include <LibCore/File.h>
#include <errno.h>
#include <grp.h>
#include <signal.h>
#include <stdio.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
String g_boot_mode = "graphical";
static void sigchld_handler(int)
{
for (;;) {
int status = 0;
pid_t pid = waitpid(-1, &status, WNOHANG);
if (pid < 0) {
perror("waitpid");
break;
}
if (pid == 0)
break;
dbgln_if(SYSTEMSERVER_DEBUG, "Reaped child with pid {}, exit status {}", pid, status);
Service* service = Service::find_by_pid(pid);
if (service == nullptr) {
// This can happen for multi-instance services.
continue;
}
service->did_exit(status);
}
}
static void parse_boot_mode()
{
auto f = Core::File::construct("/proc/cmdline");
if (!f->open(Core::IODevice::ReadOnly)) {
dbgln("Failed to read command line: {}", f->error_string());
return;
}
const String cmdline = String::copy(f->read_all(), Chomp);
dbgln("Read command line: {}", cmdline);
for (auto& part : cmdline.split_view(' ')) {
auto pair = part.split_view('=', 2);
if (pair.size() == 2 && pair[0] == "boot_mode")
g_boot_mode = pair[1];
}
dbgln("Booting in {} mode", g_boot_mode);
}
static void chown_wrapper(const char* path, uid_t uid, gid_t gid)
{
int rc = chown(path, uid, gid);
if (rc < 0 && errno != ENOENT) {
VERIFY_NOT_REACHED();
}
}
static void prepare_devfs()
{
// FIXME: Find a better way to all of this stuff, without hardcoding all of this!
int rc = mount(-1, "/dev", "dev", 0);
if (rc != 0) {
VERIFY_NOT_REACHED();
}
rc = mkdir("/dev/pts", 0755);
if (rc != 0) {
VERIFY_NOT_REACHED();
}
rc = mount(-1, "/dev/pts", "devpts", 0);
if (rc != 0) {
VERIFY_NOT_REACHED();
}
rc = symlink("/dev/random", "/dev/urandom");
if (rc < 0) {
VERIFY_NOT_REACHED();
}
auto phys_group = getgrnam("phys");
VERIFY(phys_group);
chown_wrapper("/dev/fb0", 0, phys_group->gr_gid);
chown_wrapper("/dev/keyboard0", 0, phys_group->gr_gid);
chown_wrapper("/dev/mouse0", 0, phys_group->gr_gid);
auto tty_group = getgrnam("tty");
VERIFY(tty_group);
// FIXME: Count TTYs instead of using a hardcoded amount
for (size_t index = 0; index < 6; index++) {
chown_wrapper(String::formatted("/dev/tty{}", index).characters(), 0, tty_group->gr_gid);
}
// FIXME: Count serial TTYs instead of using a hardcoded amount
for (size_t index = 0; index < 4; index++) {
chown_wrapper(String::formatted("/dev/ttyS{}", index).characters(), 0, tty_group->gr_gid);
}
auto audio_group = getgrnam("audio");
VERIFY(audio_group);
chown_wrapper("/dev/audio", 0, audio_group->gr_gid);
rc = symlink("/proc/self/fd/0", "/dev/stdin");
if (rc < 0) {
VERIFY_NOT_REACHED();
}
rc = symlink("/proc/self/fd/1", "/dev/stdout");
if (rc < 0) {
VERIFY_NOT_REACHED();
}
rc = symlink("/proc/self/fd/2", "/dev/stderr");
if (rc < 0) {
VERIFY_NOT_REACHED();
}
endgrent();
}
static void mount_all_filesystems()
{
dbgln("Spawning mount -a to mount all filesystems.");
pid_t pid = fork();
if (pid < 0) {
perror("fork");
VERIFY_NOT_REACHED();
} else if (pid == 0) {
execl("/bin/mount", "mount", "-a", nullptr);
perror("exec");
VERIFY_NOT_REACHED();
} else {
wait(nullptr);
}
}
static void create_tmp_rpc_directory()
{
dbgln("Creating /tmp/rpc directory");
auto old_umask = umask(0);
auto rc = mkdir("/tmp/rpc", 01777);
if (rc < 0) {
perror("mkdir(/tmp/rpc)");
VERIFY_NOT_REACHED();
}
umask(old_umask);
}
static void create_tmp_coredump_directory()
{
dbgln("Creating /tmp/coredump directory");
auto old_umask = umask(0);
// FIXME: the coredump directory should be made read-only once CrashDaemon is no longer responsible for compressing coredumps
auto rc = mkdir("/tmp/coredump", 0777);
if (rc < 0) {
perror("mkdir(/tmp/coredump)");
VERIFY_NOT_REACHED();
}
umask(old_umask);
}
int main(int, char**)
{
prepare_devfs();
if (pledge("stdio proc exec tty accept unix rpath wpath cpath chown fattr id sigaction", nullptr) < 0) {
perror("pledge");
return 1;
}
mount_all_filesystems();
create_tmp_rpc_directory();
create_tmp_coredump_directory();
parse_boot_mode();
Core::EventLoop event_loop;
event_loop.register_signal(SIGCHLD, sigchld_handler);
// Read our config and instantiate services.
// This takes care of setting up sockets.
NonnullRefPtrVector<Service> services;
auto config = Core::ConfigFile::get_for_system("SystemServer");
for (auto name : config->groups()) {
auto service = Service::construct(*config, name);
if (service->is_enabled())
services.append(service);
}
// After we've set them all up, activate them!
dbgln("Activating {} services...", services.size());
for (auto& service : services)
service.activate();
return event_loop.exec();
}
|
