/*
* Copyright (C) 2008 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "builtins.h"
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <mntent.h>
#include <net/if.h>
#include <signal.h>
#include <sched.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/syscall.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <linux/loop.h>
#include <linux/module.h>
#include <string>
#include <thread>
#include <selinux/android.h>
#include <selinux/selinux.h>
#include <selinux/label.h>
#include <android-base/file.h>
#include <android-base/parseint.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <bootloader_message/bootloader_message.h>
#include <cutils/android_reboot.h>
#include <ext4_utils/ext4_crypt.h>
#include <ext4_utils/ext4_crypt_init_extensions.h>
#include <fs_mgr.h>
#include <logwrap/logwrap.h>
#include "action.h"
#include "bootchart.h"
#include "devices.h"
#include "init.h"
#include "init_parser.h"
#include "log.h"
#include "property_service.h"
#include "reboot.h"
#include "service.h"
#include "signal_handler.h"
#include "util.h"
using namespace std::literals::string_literals;
#define chmod DO_NOT_USE_CHMOD_USE_FCHMODAT_SYMLINK_NOFOLLOW
static constexpr std::chrono::nanoseconds kCommandRetryTimeout = 5s;
static int insmod(const char *filename, const char *options, int flags) {
int fd = open(filename, O_RDONLY | O_NOFOLLOW | O_CLOEXEC);
if (fd == -1) {
PLOG(ERROR) << "insmod: open(\"" << filename << "\") failed";
return -1;
}
int rc = syscall(__NR_finit_module, fd, options, flags);
if (rc == -1) {
PLOG(ERROR) << "finit_module for \"" << filename << "\" failed";
}
close(fd);
return rc;
}
static int __ifupdown(const char *interface, int up) {
struct ifreq ifr;
int s, ret;
strlcpy(ifr.ifr_name, interface, IFNAMSIZ);
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s < 0)
return -1;
ret = ioctl(s, SIOCGIFFLAGS, &ifr);
if (ret < 0) {
goto done;
}
if (up)
ifr.ifr_flags |= IFF_UP;
else
ifr.ifr_flags &= ~IFF_UP;
ret = ioctl(s, SIOCSIFFLAGS, &ifr);
done:
close(s);
return ret;
}
static int reboot_into_recovery(const std::vector<std::string>& options) {
std::string err;
if (!write_bootloader_message(options, &err)) {
LOG(ERROR) << "failed to set bootloader message: " << err;
return -1;
}
DoReboot(ANDROID_RB_RESTART2, "reboot", "recovery", false);
return 0;
}
static int do_class_start(const std::vector<std::string>& args) {
/* Starting a class does not start services
* which are explicitly disabled. They must
* be started individually.
*/
ServiceManager::GetInstance().
ForEachServiceInClass(args[1], [] (Service* s) { s->StartIfNotDisabled(); });
return 0;
}
static int do_class_stop(const std::vector<std::string>& args) {
ServiceManager::GetInstance().
ForEachServiceInClass(args[1], [] (Service* s) { s->Stop(); });
return 0;
}
static int do_class_reset(const std::vector<std::string>& args) {
ServiceManager::GetInstance().
ForEachServiceInClass(args[1], [] (Service* s) { s->Reset(); });
return 0;
}
static int do_class_restart(const std::vector<std::string>& args) {
ServiceManager::GetInstance().
ForEachServiceInClass(args[1], [] (Service* s) { s->Restart(); });
return 0;
}
static int do_domainname(const std::vector<std::string>& args) {
return write_file("/proc/sys/kernel/domainname", args[1]) ? 0 : 1;
}
static int do_enable(const std::vector<std::string>& args) {
Service* svc = ServiceManager::GetInstance().FindServiceByName(args[1]);
if (!svc) {
return -1;
}
return svc->Enable();
}
static int do_exec(const std::vector<std::string>& args) {
return ServiceManager::GetInstance().Exec(args) ? 0 : -1;
}
static int do_exec_start(const std::vector<std::string>& args) {
return ServiceManager::GetInstance().ExecStart(args[1]) ? 0 : -1;
}
static int do_export(const std::vector<std::string>& args) {
return add_environment(args[1].c_str(), args[2].c_str());
}
static int do_hostname(const std::vector<std::string>& args) {
return write_file("/proc/sys/kernel/hostname", args[1]) ? 0 : 1;
}
static int do_ifup(const std::vector<std::string>& args) {
return __ifupdown(args[1].c_str(), 1);
}
static int do_insmod(const std::vector<std::string>& args) {
int flags = 0;
auto it = args.begin() + 1;
if (!(*it).compare("-f")) {
flags = MODULE_INIT_IGNORE_VERMAGIC | MODULE_INIT_IGNORE_MODVERSIONS;
it++;
}
std::string filename = *it++;
std::string options = android::base::Join(std::vector<std::string>(it, args.end()), ' ');
return insmod(filename.c_str(), options.c_str(), flags);
}
static int do_mkdir(const std::vector<std::string>& args) {
mode_t mode = 0755;
int ret;
/* mkdir <path> [mode] [owner] [group] */
if (args.size() >= 3) {
mode = std::strtoul(args[2].c_str(), 0, 8);
}
ret = make_dir(args[1].c_str(), mode);
/* chmod in case the directory already exists */
if (ret == -1 && errno == EEXIST) {
ret = fchmodat(AT_FDCWD, args[1].c_str(), mode, AT_SYMLINK_NOFOLLOW);
}
if (ret == -1) {
return -errno;
}
if (args.size() >= 4) {
uid_t uid = decode_uid(args[3].c_str());
gid_t gid = -1;
if (args.size() == 5) {
gid = decode_uid(args[4].c_str());
}
if (lchown(args[1].c_str(), uid, gid) == -1) {
return -errno;
}
/* chown may have cleared S_ISUID and S_ISGID, chmod again */
if (mode & (S_ISUID | S_ISGID)) {
ret = fchmodat(AT_FDCWD, args[1].c_str(), mode, AT_SYMLINK_NOFOLLOW);
if (ret == -1) {
return -errno;
}
}
}
if (e4crypt_is_native()) {
if (e4crypt_set_directory_policy(args[1].c_str())) {
const std::vector<std::string> options = {
"--prompt_and_wipe_data",
"--reason=set_policy_failed:"s + args[1]};
reboot_into_recovery(options);
return -1;
}
}
return 0;
}
/* umount <path> */
static int do_umount(const std::vector<std::string>& args) {
return umount(args[1].c_str());
}
static struct {
const char *name;
unsigned flag;
} mount_flags[] = {
{ "noatime", MS_NOATIME },
{ "noexec", MS_NOEXEC },
{ "nosuid", MS_NOSUID },
{ "nodev", MS_NODEV },
{ "nodiratime", MS_NODIRATIME },
{ "ro", MS_RDONLY },
{ "rw", 0 },
{ "remount", MS_REMOUNT },
{ "bind", MS_BIND },
{ "rec", MS_REC },
{ "unbindable", MS_UNBINDABLE },
{ "private", MS_PRIVATE },
{ "slave", MS_SLAVE },
{ "shared", MS_SHARED },
{ "defaults", 0 },
{ 0, 0 },
};
#define DATA_MNT_POINT "/data"
/* mount <type> <device> <path> <flags ...> <options> */
static int do_mount(const std::vector<std::string>& args) {
char tmp[64];
const char *source, *target, *system;
const char *options = NULL;
unsigned flags = 0;
std::size_t na = 0;
int n, i;
int wait = 0;
for (na = 4; na < args.size(); na++) {
for (i = 0; mount_flags[i].name; i++) {
if (!args[na].compare(mount_flags[i].name)) {
flags |= mount_flags[i].flag;
break;
}
}
if (!mount_flags[i].name) {
if (!args[na].compare("wait"))
wait = 1;
/* if our last argument isn't a flag, wolf it up as an option string */
else if (na + 1 == args.size())
options = args[na].c_str();
}
}
system = args[1].c_str();
source = args[2].c_str();
target = args[3].c_str();
if (!strncmp(source, "loop@", 5)) {
int mode, loop, fd;
struct loop_info info;
mode = (flags & MS_RDONLY) ? O_RDONLY : O_RDWR;
fd = open(source + 5, mode | O_CLOEXEC);
if (fd < 0) {
return -1;
}
for (n = 0; ; n++) {
snprintf(tmp, sizeof(tmp), "/dev/block/loop%d", n);
loop = open(tmp, mode | O_CLOEXEC);
if (loop < 0) {
close(fd);
return -1;
}
/* if it is a blank loop device */
if (ioctl(loop, LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) {
/* if it becomes our loop device */
if (ioctl(loop, LOOP_SET_FD, fd) >= 0) {
close(fd);
if (mount(tmp, target, system, flags, options) < 0) {
ioctl(loop, LOOP_CLR_FD, 0);
close(loop);
return -1;
}
close(loop);
goto exit_success;
}
}
close(loop);
}
close(fd);
LOG(ERROR) << "out of loopback devices";
return -1;
} else {
if (wait)
wait_for_file(source, kCommandRetryTimeout);
if (mount(source, target, system, flags, options) < 0) {
return -1;
}
}
exit_success:
return 0;
}
/* Imports .rc files from the specified paths. Default ones are applied if none is given.
*
* start_index: index of the first path in the args list
*/
static void import_late(const std::vector<std::string>& args, size_t start_index, size_t end_index) {
Parser& parser = Parser::GetInstance();
if (end_index <= start_index) {
// Fallbacks for partitions on which early mount isn't enabled.
if (!parser.is_system_etc_init_loaded()) {
parser.ParseConfig("/system/etc/init");
parser.set_is_system_etc_init_loaded(true);
}
if (!parser.is_vendor_etc_init_loaded()) {
parser.ParseConfig("/vendor/etc/init");
parser.set_is_vendor_etc_init_loaded(true);
}
if (!parser.is_odm_etc_init_loaded()) {
parser.ParseConfig("/odm/etc/init");
parser.set_is_odm_etc_init_loaded(true);
}
} else {
for (size_t i = start_index; i < end_index; ++i) {
parser.ParseConfig(args[i]);
}
}
// Turning this on and letting the INFO logging be discarded adds 0.2s to
// Nexus 9 boot time, so it's disabled by default.
if (false) parser.DumpState();
}
/* mount_fstab
*
* Call fs_mgr_mount_all() to mount the given fstab
*/
static int mount_fstab(const char* fstabfile, int mount_mode) {
int ret = -1;
/*
* Call fs_mgr_mount_all() to mount all filesystems. We fork(2) and
* do the call in the child to provide protection to the main init
* process if anything goes wrong (crash or memory leak), and wait for
* the child to finish in the parent.
*/
pid_t pid = fork();
if (pid > 0) {
/* Parent. Wait for the child to return */
int status;
int wp_ret = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0));
if (wp_ret == -1) {
// Unexpected error code. We will continue anyway.
PLOG(WARNING) << "waitpid failed";
}
if (WIFEXITED(status)) {
ret = WEXITSTATUS(status);
} else {
ret = -1;
}
} else if (pid == 0) {
/* child, call fs_mgr_mount_all() */
// So we can always see what fs_mgr_mount_all() does.
// Only needed if someone explicitly changes the default log level in their init.rc.
android::base::ScopedLogSeverity info(android::base::INFO);
struct fstab* fstab = fs_mgr_read_fstab(fstabfile);
int child_ret = fs_mgr_mount_all(fstab, mount_mode);
fs_mgr_free_fstab(fstab);
if (child_ret == -1) {
PLOG(ERROR) << "fs_mgr_mount_all returned an error";
}
_exit(child_ret);
} else {
/* fork failed, return an error */
return -1;
}
return ret;
}
/* Queue event based on fs_mgr return code.
*
* code: return code of fs_mgr_mount_all
*
* This function might request a reboot, in which case it will
* not return.
*
* return code is processed based on input code
*/
static int queue_fs_event(int code) {
int ret = code;
if (code == FS_MGR_MNTALL_DEV_NEEDS_ENCRYPTION) {
ActionManager::GetInstance().QueueEventTrigger("encrypt");
} else if (code == FS_MGR_MNTALL_DEV_MIGHT_BE_ENCRYPTED) {
property_set("ro.crypto.state", "encrypted");
property_set("ro.crypto.type", "block");
ActionManager::GetInstance().QueueEventTrigger("defaultcrypto");
} else if (code == FS_MGR_MNTALL_DEV_NOT_ENCRYPTED) {
property_set("ro.crypto.state", "unencrypted");
ActionManager::GetInstance().QueueEventTrigger("nonencrypted");
} else if (code == FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE) {
property_set("ro.crypto.state", "unsupported");
ActionManager::GetInstance().QueueEventTrigger("nonencrypted");
} else if (code == FS_MGR_MNTALL_DEV_NEEDS_RECOVERY) {
/* Setup a wipe via recovery, and reboot into recovery */
PLOG(ERROR) << "fs_mgr_mount_all suggested recovery, so wiping data via recovery.";
const std::vector<std::string> options = {"--wipe_data", "--reason=fs_mgr_mount_all" };
ret = reboot_into_recovery(options);
/* If reboot worked, there is no return. */
} else if (code == FS_MGR_MNTALL_DEV_FILE_ENCRYPTED) {
if (e4crypt_install_keyring()) {
return -1;
}
property_set("ro.crypto.state", "encrypted");
property_set("ro.crypto.type", "file");
// Although encrypted, we have device key, so we do not need to
// do anything different from the nonencrypted case.
ActionManager::GetInstance().QueueEventTrigger("nonencrypted");
} else if (code > 0) {
PLOG(ERROR) << "fs_mgr_mount_all returned unexpected error " << code;
}
/* else ... < 0: error */
return ret;
}
/* mount_all <fstab> [ <path> ]* [--<options>]*
*
* This function might request a reboot, in which case it will
* not return.
*/
static int do_mount_all(const std::vector<std::string>& args) {
std::size_t na = 0;
bool import_rc = true;
bool queue_event = true;
int mount_mode = MOUNT_MODE_DEFAULT;
const char* fstabfile = args[1].c_str();
std::size_t path_arg_end = args.size();
const char* prop_post_fix = "default";
for (na = args.size() - 1; na > 1; --na) {
if (args[na] == "--early") {
path_arg_end = na;
queue_event = false;
mount_mode = MOUNT_MODE_EARLY;
prop_post_fix = "early";
} else if (args[na] == "--late") {
path_arg_end = na;
import_rc = false;
mount_mode = MOUNT_MODE_LATE;
prop_post_fix = "late";
}
}
std::string prop_name = android::base::StringPrintf("ro.boottime.init.mount_all.%s",
prop_post_fix);
Timer t;
int ret = mount_fstab(fstabfile, mount_mode);
property_set(prop_name.c_str(), std::to_string(t.duration_ms()).c_str());
if (import_rc) {
/* Paths of .rc files are specified at the 2nd argument and beyond */
import_late(args, 2, path_arg_end);
}
if (queue_event) {
/* queue_fs_event will queue event based on mount_fstab return code
* and return processed return code*/
ret = queue_fs_event(ret);
}
return ret;
}
static int do_swapon_all(const std::vector<std::string>& args) {
struct fstab *fstab;
int ret;
fstab = fs_mgr_read_fstab(args[1].c_str());
ret = fs_mgr_swapon_all(fstab);
fs_mgr_free_fstab(fstab);
return ret;
}
static int do_setprop(const std::vector<std::string>& args) {
const char* name = args[1].c_str();
const char* value = args[2].c_str();
property_set(name, value);
return 0;
}
static int do_setrlimit(const std::vector<std::string>& args) {
struct rlimit limit;
int resource;
if (android::base::ParseInt(args[1], &resource) &&
android::base::ParseUint(args[2], &limit.rlim_cur) &&
android::base::ParseUint(args[3], &limit.rlim_max)) {
return setrlimit(resource, &limit);
}
LOG(WARNING) << "ignoring setrlimit " << args[1] << " " << args[2] << " " << args[3];
return -1;
}
static int do_start(const std::vector<std::string>& args) {
Service* svc = ServiceManager::GetInstance().FindServiceByName(args[1]);
if (!svc) {
LOG(ERROR) << "do_start: Service " << args[1] << " not found";
return -1;
}
if (!svc->Start())
return -1;
return 0;
}
static int do_stop(const std::vector<std::string>& args) {
Service* svc = ServiceManager::GetInstance().FindServiceByName(args[1]);
if (!svc) {
LOG(ERROR) << "do_stop: Service " << args[1] << " not found";
return -1;
}
svc->Stop();
return 0;
}
static int do_restart(const std::vector<std::string>& args) {
Service* svc = ServiceManager::GetInstance().FindServiceByName(args[1]);
if (!svc) {
LOG(ERROR) << "do_restart: Service " << args[1] << " not found";
return -1;
}
svc->Restart();
return 0;
}
static int do_trigger(const std::vector<std::string>& args) {
ActionManager::GetInstance().QueueEventTrigger(args[1]);
return 0;
}
static int do_symlink(const std::vector<std::string>& args) {
return symlink(args[1].c_str(), args[2].c_str());
}
static int do_rm(const std::vector<std::string>& args) {
return unlink(args[1].c_str());
}
static int do_rmdir(const std::vector<std::string>& args) {
return rmdir(args[1].c_str());
}
static int do_sysclktz(const std::vector<std::string>& args) {
struct timezone tz = {};
if (android::base::ParseInt(args[1], &tz.tz_minuteswest) && settimeofday(NULL, &tz) != -1) {
return 0;
}
return -1;
}
static int do_verity_load_state(const std::vector<std::string>& args) {
int mode = -1;
bool loaded = fs_mgr_load_verity_state(&mode);
if (loaded && mode != VERITY_MODE_DEFAULT) {
ActionManager::GetInstance().QueueEventTrigger("verity-logging");
}
return loaded ? 0 : 1;
}
static void verity_update_property(fstab_rec *fstab, const char *mount_point,
int mode, int status) {
property_set(android::base::StringPrintf("partition.%s.verified", mount_point).c_str(),
android::base::StringPrintf("%d", mode).c_str());
}
static int do_verity_update_state(const std::vector<std::string>& args) {
return fs_mgr_update_verity_state(verity_update_property) ? 0 : 1;
}
static int do_write(const std::vector<std::string>& args) {
return write_file(args[1], args[2]) ? 0 : 1;
}
static int do_copy(const std::vector<std::string>& args) {
std::string data;
if (read_file(args[1], &data)) {
return write_file(args[2], data) ? 0 : 1;
}
return 1;
}
static int do_chown(const std::vector<std::string>& args) {
/* GID is optional. */
if (args.size() == 3) {
if (lchown(args[2].c_str(), decode_uid(args[1].c_str()), -1) == -1)
return -errno;
} else if (args.size() == 4) {
if (lchown(args[3].c_str(), decode_uid(args[1].c_str()),
decode_uid(args[2].c_str())) == -1)
return -errno;
} else {
return -1;
}
return 0;
}
static mode_t get_mode(const char *s) {
mode_t mode = 0;
while (*s) {
if (*s >= '0' && *s <= '7') {
mode = (mode<<3) | (*s-'0');
} else {
return -1;
}
s++;
}
return mode;
}
static int do_chmod(const std::vector<std::string>& args) {
mode_t mode = get_mode(args[1].c_str());
if (fchmodat(AT_FDCWD, args[2].c_str(), mode, AT_SYMLINK_NOFOLLOW) < 0) {
return -errno;
}
return 0;
}
static int do_restorecon(const std::vector<std::string>& args) {
int ret = 0;
struct flag_type {const char* name; int value;};
static const flag_type flags[] = {
{"--recursive", SELINUX_ANDROID_RESTORECON_RECURSE},
{"--skip-ce", SELINUX_ANDROID_RESTORECON_SKIPCE},
{"--cross-filesystems", SELINUX_ANDROID_RESTORECON_CROSS_FILESYSTEMS},
{0, 0}
};
int flag = 0;
bool in_flags = true;
for (size_t i = 1; i < args.size(); ++i) {
if (android::base::StartsWith(args[i], "--")) {
if (!in_flags) {
LOG(ERROR) << "restorecon - flags must precede paths";
return -1;
}
bool found = false;
for (size_t j = 0; flags[j].name; ++j) {
if (args[i] == flags[j].name) {
flag |= flags[j].value;
found = true;
break;
}
}
if (!found) {
LOG(ERROR) << "restorecon - bad flag " << args[i];
return -1;
}
} else {
in_flags = false;
if (restorecon(args[i].c_str(), flag) < 0) {
ret = -errno;
}
}
}
return ret;
}
static int do_restorecon_recursive(const std::vector<std::string>& args) {
std::vector<std::string> non_const_args(args);
non_const_args.insert(std::next(non_const_args.begin()), "--recursive");
return do_restorecon(non_const_args);
}
static int do_loglevel(const std::vector<std::string>& args) {
// TODO: support names instead/as well?
int log_level = -1;
android::base::ParseInt(args[1], &log_level);
android::base::LogSeverity severity;
switch (log_level) {
case 7: severity = android::base::DEBUG; break;
case 6: severity = android::base::INFO; break;
case 5:
case 4: severity = android::base::WARNING; break;
case 3: severity = android::base::ERROR; break;
case 2:
case 1:
case 0: severity = android::base::FATAL; break;
default:
LOG(ERROR) << "loglevel: invalid log level " << log_level;
return -EINVAL;
}
android::base::SetMinimumLogSeverity(severity);
return 0;
}
static int do_load_persist_props(const std::vector<std::string>& args) {
load_persist_props();
return 0;
}
static int do_load_system_props(const std::vector<std::string>& args) {
load_system_props();
return 0;
}
static int do_wait(const std::vector<std::string>& args) {
if (args.size() == 2) {
return wait_for_file(args[1].c_str(), kCommandRetryTimeout);
} else if (args.size() == 3) {
int timeout;
if (android::base::ParseInt(args[2], &timeout)) {
return wait_for_file(args[1].c_str(), std::chrono::seconds(timeout));
}
}
return -1;
}
static int do_wait_for_prop(const std::vector<std::string>& args) {
const char* name = args[1].c_str();
const char* value = args[2].c_str();
size_t value_len = strlen(value);
if (!is_legal_property_name(name)) {
LOG(ERROR) << "do_wait_for_prop(\"" << name << "\", \"" << value
<< "\") failed: bad name";
return -1;
}
if (value_len >= PROP_VALUE_MAX) {
LOG(ERROR) << "do_wait_for_prop(\"" << name << "\", \"" << value
<< "\") failed: value too long";
return -1;
}
if (!start_waiting_for_property(name, value)) {
LOG(ERROR) << "do_wait_for_prop(\"" << name << "\", \"" << value
<< "\") failed: init already in waiting";
return -1;
}
return 0;
}
/*
* Callback to make a directory from the ext4 code
*/
static int do_installkeys_ensure_dir_exists(const char* dir) {
if (make_dir(dir, 0700) && errno != EEXIST) {
return -1;
}
return 0;
}
static bool is_file_crypto() {
return android::base::GetProperty("ro.crypto.type", "") == "file";
}
static int do_installkey(const std::vector<std::string>& args) {
if (!is_file_crypto()) {
return 0;
}
auto unencrypted_dir = args[1] + e4crypt_unencrypted_folder;
if (do_installkeys_ensure_dir_exists(unencrypted_dir.c_str())) {
PLOG(ERROR) << "Failed to create " << unencrypted_dir;
return -1;
}
std::vector<std::string> exec_args = {"exec", "/system/bin/vdc", "--wait", "cryptfs",
"enablefilecrypto"};
return do_exec(exec_args);
}
static int do_init_user0(const std::vector<std::string>& args) {
return e4crypt_do_init_user0();
}
BuiltinFunctionMap::Map& BuiltinFunctionMap::map() const {
constexpr std::size_t kMax = std::numeric_limits<std::size_t>::max();
// clang-format off
static const Map builtin_functions = {
{"bootchart", {1, 1, do_bootchart}},
{"chmod", {2, 2, do_chmod}},
{"chown", {2, 3, do_chown}},
{"class_reset", {1, 1, do_class_reset}},
{"class_restart", {1, 1, do_class_restart}},
{"class_start", {1, 1, do_class_start}},
{"class_stop", {1, 1, do_class_stop}},
{"copy", {2, 2, do_copy}},
{"domainname", {1, 1, do_domainname}},
{"enable", {1, 1, do_enable}},
{"exec", {1, kMax, do_exec}},
{"exec_start", {1, 1, do_exec_start}},
{"export", {2, 2, do_export}},
{"hostname", {1, 1, do_hostname}},
{"ifup", {1, 1, do_ifup}},
{"init_user0", {0, 0, do_init_user0}},
{"insmod", {1, kMax, do_insmod}},
{"installkey", {1, 1, do_installkey}},
{"load_persist_props", {0, 0, do_load_persist_props}},
{"load_system_props", {0, 0, do_load_system_props}},
{"loglevel", {1, 1, do_loglevel}},
{"mkdir", {1, 4, do_mkdir}},
{"mount_all", {1, kMax, do_mount_all}},
{"mount", {3, kMax, do_mount}},
{"umount", {1, 1, do_umount}},
{"restart", {1, 1, do_restart}},
{"restorecon", {1, kMax, do_restorecon}},
{"restorecon_recursive", {1, kMax, do_restorecon_recursive}},
{"rm", {1, 1, do_rm}},
{"rmdir", {1, 1, do_rmdir}},
{"setprop", {2, 2, do_setprop}},
{"setrlimit", {3, 3, do_setrlimit}},
{"start", {1, 1, do_start}},
{"stop", {1, 1, do_stop}},
{"swapon_all", {1, 1, do_swapon_all}},
{"symlink", {2, 2, do_symlink}},
{"sysclktz", {1, 1, do_sysclktz}},
{"trigger", {1, 1, do_trigger}},
{"verity_load_state", {0, 0, do_verity_load_state}},
{"verity_update_state", {0, 0, do_verity_update_state}},
{"wait", {1, 2, do_wait}},
{"wait_for_prop", {2, 2, do_wait_for_prop}},
{"write", {2, 2, do_write}},
};
// clang-format on
return builtin_functions;
}