/*
* 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 <fts.h>
#include <linux/loop.h>
#include <linux/module.h>
#include <mntent.h>
#include <net/if.h>
#include <sched.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mount.h>
#include <sys/resource.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/syscall.h>
#include <sys/system_properties.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>
#include <android-base/chrono_utils.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include <android-base/unique_fd.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 <selinux/android.h>
#include <selinux/label.h>
#include <selinux/selinux.h>
#include <system/thread_defs.h>
#include "action.h"
#include "bootchart.h"
#include "init.h"
#include "parser.h"
#include "property_service.h"
#include "reboot.h"
#include "rlimit_parser.h"
#include "selinux.h"
#include "service.h"
#include "subcontext.h"
#include "util.h"
using namespace std::literals::string_literals;
using android::base::unique_fd;
#define chmod DO_NOT_USE_CHMOD_USE_FCHMODAT_SYMLINK_NOFOLLOW
namespace android {
namespace init {
static constexpr std::chrono::nanoseconds kCommandRetryTimeout = 5s;
static Result<Success> reboot_into_recovery(const std::vector<std::string>& options) {
std::string err;
if (!write_bootloader_message(options, &err)) {
return Error() << "Failed to set bootloader message: " << err;
}
property_set("sys.powerctl", "reboot,recovery");
return Success();
}
template <typename F>
static void ForEachServiceInClass(const std::string& classname, F function) {
for (const auto& service : ServiceList::GetInstance()) {
if (service->classnames().count(classname)) std::invoke(function, service);
}
}
static Result<Success> do_class_start(const BuiltinArguments& args) {
// Starting a class does not start services which are explicitly disabled.
// They must be started individually.
for (const auto& service : ServiceList::GetInstance()) {
if (service->classnames().count(args[1])) {
if (auto result = service->StartIfNotDisabled(); !result) {
LOG(ERROR) << "Could not start service '" << service->name()
<< "' as part of class '" << args[1] << "': " << result.error();
}
}
}
return Success();
}
static Result<Success> do_class_stop(const BuiltinArguments& args) {
ForEachServiceInClass(args[1], &Service::Stop);
return Success();
}
static Result<Success> do_class_reset(const BuiltinArguments& args) {
ForEachServiceInClass(args[1], &Service::Reset);
return Success();
}
static Result<Success> do_class_restart(const BuiltinArguments& args) {
ForEachServiceInClass(args[1], &Service::Restart);
return Success();
}
static Result<Success> do_domainname(const BuiltinArguments& args) {
if (auto result = WriteFile("/proc/sys/kernel/domainname", args[1]); !result) {
return Error() << "Unable to write to /proc/sys/kernel/domainname: " << result.error();
}
return Success();
}
static Result<Success> do_enable(const BuiltinArguments& args) {
Service* svc = ServiceList::GetInstance().FindService(args[1]);
if (!svc) return Error() << "Could not find service";
if (auto result = svc->Enable(); !result) {
return Error() << "Could not enable service: " << result.error();
}
return Success();
}
static Result<Success> do_exec(const BuiltinArguments& args) {
auto service = Service::MakeTemporaryOneshotService(args.args);
if (!service) {
return Error() << "Could not create exec service";
}
if (auto result = service->ExecStart(); !result) {
return Error() << "Could not start exec service: " << result.error();
}
ServiceList::GetInstance().AddService(std::move(service));
return Success();
}
static Result<Success> do_exec_background(const BuiltinArguments& args) {
auto service = Service::MakeTemporaryOneshotService(args.args);
if (!service) {
return Error() << "Could not create exec background service";
}
if (auto result = service->Start(); !result) {
return Error() << "Could not start exec background service: " << result.error();
}
ServiceList::GetInstance().AddService(std::move(service));
return Success();
}
static Result<Success> do_exec_start(const BuiltinArguments& args) {
Service* service = ServiceList::GetInstance().FindService(args[1]);
if (!service) {
return Error() << "Service not found";
}
if (auto result = service->ExecStart(); !result) {
return Error() << "Could not start exec service: " << result.error();
}
return Success();
}
static Result<Success> do_export(const BuiltinArguments& args) {
if (setenv(args[1].c_str(), args[2].c_str(), 1) == -1) {
return ErrnoError() << "setenv() failed";
}
return Success();
}
static Result<Success> do_hostname(const BuiltinArguments& args) {
if (auto result = WriteFile("/proc/sys/kernel/hostname", args[1]); !result) {
return Error() << "Unable to write to /proc/sys/kernel/hostname: " << result.error();
}
return Success();
}
static Result<Success> do_ifup(const BuiltinArguments& args) {
struct ifreq ifr;
strlcpy(ifr.ifr_name, args[1].c_str(), IFNAMSIZ);
unique_fd s(TEMP_FAILURE_RETRY(socket(AF_INET, SOCK_DGRAM, 0)));
if (s < 0) return ErrnoError() << "opening socket failed";
if (ioctl(s, SIOCGIFFLAGS, &ifr) < 0) {
return ErrnoError() << "ioctl(..., SIOCGIFFLAGS, ...) failed";
}
ifr.ifr_flags |= IFF_UP;
if (ioctl(s, SIOCSIFFLAGS, &ifr) < 0) {
return ErrnoError() << "ioctl(..., SIOCSIFFLAGS, ...) failed";
}
return Success();
}
static Result<Success> do_insmod(const BuiltinArguments& 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()), ' ');
unique_fd fd(TEMP_FAILURE_RETRY(open(filename.c_str(), O_RDONLY | O_NOFOLLOW | O_CLOEXEC)));
if (fd == -1) return ErrnoError() << "open(\"" << filename << "\") failed";
int rc = syscall(__NR_finit_module, fd.get(), options.c_str(), flags);
if (rc == -1) return ErrnoError() << "finit_module for \"" << filename << "\" failed";
return Success();
}
// mkdir <path> [mode] [owner] [group]
static Result<Success> do_mkdir(const BuiltinArguments& args) {
mode_t mode = 0755;
if (args.size() >= 3) {
mode = std::strtoul(args[2].c_str(), 0, 8);
}
if (!make_dir(args[1], mode)) {
/* chmod in case the directory already exists */
if (errno == EEXIST) {
if (fchmodat(AT_FDCWD, args[1].c_str(), mode, AT_SYMLINK_NOFOLLOW) == -1) {
return ErrnoError() << "fchmodat() failed";
}
} else {
return ErrnoError() << "mkdir() failed";
}
}
if (args.size() >= 4) {
auto uid = DecodeUid(args[3]);
if (!uid) {
return Error() << "Unable to decode UID for '" << args[3] << "': " << uid.error();
}
Result<gid_t> gid = -1;
if (args.size() == 5) {
gid = DecodeUid(args[4]);
if (!gid) {
return Error() << "Unable to decode GID for '" << args[3] << "': " << gid.error();
}
}
if (lchown(args[1].c_str(), *uid, *gid) == -1) {
return ErrnoError() << "lchown failed";
}
/* chown may have cleared S_ISUID and S_ISGID, chmod again */
if (mode & (S_ISUID | S_ISGID)) {
if (fchmodat(AT_FDCWD, args[1].c_str(), mode, AT_SYMLINK_NOFOLLOW) == -1) {
return ErrnoError() << "fchmodat failed";
}
}
}
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 Success();
}
}
return Success();
}
/* umount <path> */
static Result<Success> do_umount(const BuiltinArguments& args) {
if (umount(args[1].c_str()) < 0) {
return ErrnoError() << "umount() failed";
}
return Success();
}
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 Result<Success> do_mount(const BuiltinArguments& args) {
const char* options = nullptr;
unsigned flags = 0;
bool wait = false;
for (size_t na = 4; na < args.size(); na++) {
size_t i;
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 = true;
// 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();
}
}
}
const char* system = args[1].c_str();
const char* source = args[2].c_str();
const char* target = args[3].c_str();
if (android::base::StartsWith(source, "loop@")) {
int mode = (flags & MS_RDONLY) ? O_RDONLY : O_RDWR;
unique_fd fd(TEMP_FAILURE_RETRY(open(source + 5, mode | O_CLOEXEC)));
if (fd < 0) return ErrnoError() << "open(" << source + 5 << ", " << mode << ") failed";
for (size_t n = 0;; n++) {
std::string tmp = android::base::StringPrintf("/dev/block/loop%zu", n);
unique_fd loop(TEMP_FAILURE_RETRY(open(tmp.c_str(), mode | O_CLOEXEC)));
if (loop < 0) return ErrnoError() << "open(" << tmp << ", " << mode << ") failed";
loop_info info;
/* 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.get()) >= 0) {
if (mount(tmp.c_str(), target, system, flags, options) < 0) {
ioctl(loop, LOOP_CLR_FD, 0);
return ErrnoError() << "mount() failed";
}
return Success();
}
}
}
return Error() << "out of loopback devices";
} else {
if (wait)
wait_for_file(source, kCommandRetryTimeout);
if (mount(source, target, system, flags, options) < 0) {
return ErrnoError() << "mount() failed";
}
}
return Success();
}
/* 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) {
auto& action_manager = ActionManager::GetInstance();
auto& service_list = ServiceList::GetInstance();
Parser parser = CreateParser(action_manager, service_list);
if (end_index <= start_index) {
// Fallbacks for partitions on which early mount isn't enabled.
for (const auto& path : late_import_paths) {
parser.ParseConfig(path);
}
late_import_paths.clear();
} 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) DumpState();
}
/* mount_fstab
*
* Call fs_mgr_mount_all() to mount the given fstab
*/
static Result<int> mount_fstab(const char* fstabfile, int mount_mode) {
/*
* 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)) {
return WEXITSTATUS(status);
} else {
return Error() << "child aborted";
}
} 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 {
return Error() << "fork() failed";
}
}
/* 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 Result<Success> queue_fs_event(int code) {
if (code == FS_MGR_MNTALL_DEV_NEEDS_ENCRYPTION) {
ActionManager::GetInstance().QueueEventTrigger("encrypt");
return Success();
} 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");
return Success();
} else if (code == FS_MGR_MNTALL_DEV_NOT_ENCRYPTED) {
property_set("ro.crypto.state", "unencrypted");
ActionManager::GetInstance().QueueEventTrigger("nonencrypted");
return Success();
} else if (code == FS_MGR_MNTALL_DEV_NOT_ENCRYPTABLE) {
property_set("ro.crypto.state", "unsupported");
ActionManager::GetInstance().QueueEventTrigger("nonencrypted");
return Success();
} 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" };
reboot_into_recovery(options);
return Success();
/* If reboot worked, there is no return. */
} else if (code == FS_MGR_MNTALL_DEV_FILE_ENCRYPTED) {
if (e4crypt_install_keyring()) {
return Error() << "e4crypt_install_keyring() failed";
}
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");
return Success();
} else if (code == FS_MGR_MNTALL_DEV_IS_METADATA_ENCRYPTED) {
if (e4crypt_install_keyring()) {
return Error() << "e4crypt_install_keyring() failed";
}
property_set("ro.crypto.state", "encrypted");
property_set("ro.crypto.type", "file");
// defaultcrypto detects file/block encryption. init flow is same for each.
ActionManager::GetInstance().QueueEventTrigger("defaultcrypto");
return Success();
} else if (code == FS_MGR_MNTALL_DEV_NEEDS_METADATA_ENCRYPTION) {
if (e4crypt_install_keyring()) {
return Error() << "e4crypt_install_keyring() failed";
}
property_set("ro.crypto.type", "file");
// encrypt detects file/block encryption. init flow is same for each.
ActionManager::GetInstance().QueueEventTrigger("encrypt");
return Success();
} else if (code > 0) {
Error() << "fs_mgr_mount_all() returned unexpected error " << code;
}
/* else ... < 0: error */
return Error() << "Invalid code: " << code;
}
/* mount_all <fstab> [ <path> ]* [--<options>]*
*
* This function might request a reboot, in which case it will
* not return.
*/
static Result<Success> do_mount_all(const BuiltinArguments& 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 = "ro.boottime.init.mount_all."s + prop_post_fix;
android::base::Timer t;
auto mount_fstab_return_code = mount_fstab(fstabfile, mount_mode);
if (!mount_fstab_return_code) {
return Error() << "mount_fstab() failed " << mount_fstab_return_code.error();
}
property_set(prop_name, std::to_string(t.duration().count()));
if (import_rc) {
/* Paths of .rc files are specified at the 2nd argument and beyond */
import_late(args.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*/
auto queue_fs_result = queue_fs_event(*mount_fstab_return_code);
if (!queue_fs_result) {
return Error() << "queue_fs_event() failed: " << queue_fs_result.error();
}
}
return Success();
}
static Result<Success> do_swapon_all(const BuiltinArguments& 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);
if (ret != 0) return Error() << "fs_mgr_swapon_all() failed";
return Success();
}
static Result<Success> do_setprop(const BuiltinArguments& args) {
property_set(args[1], args[2]);
return Success();
}
static Result<Success> do_setrlimit(const BuiltinArguments& args) {
auto rlimit = ParseRlimit(args.args);
if (!rlimit) return rlimit.error();
if (setrlimit(rlimit->first, &rlimit->second) == -1) {
return ErrnoError() << "setrlimit failed";
}
return Success();
}
static Result<Success> do_start(const BuiltinArguments& args) {
Service* svc = ServiceList::GetInstance().FindService(args[1]);
if (!svc) return Error() << "service " << args[1] << " not found";
if (auto result = svc->Start(); !result) {
return Error() << "Could not start service: " << result.error();
}
return Success();
}
static Result<Success> do_stop(const BuiltinArguments& args) {
Service* svc = ServiceList::GetInstance().FindService(args[1]);
if (!svc) return Error() << "service " << args[1] << " not found";
svc->Stop();
return Success();
}
static Result<Success> do_restart(const BuiltinArguments& args) {
Service* svc = ServiceList::GetInstance().FindService(args[1]);
if (!svc) return Error() << "service " << args[1] << " not found";
svc->Restart();
return Success();
}
static Result<Success> do_trigger(const BuiltinArguments& args) {
ActionManager::GetInstance().QueueEventTrigger(args[1]);
return Success();
}
static int MakeSymlink(const std::string& target, const std::string& linkpath) {
std::string secontext;
// Passing 0 for mode should work.
if (SelabelLookupFileContext(linkpath, 0, &secontext) && !secontext.empty()) {
setfscreatecon(secontext.c_str());
}
int rc = symlink(target.c_str(), linkpath.c_str());
if (!secontext.empty()) {
int save_errno = errno;
setfscreatecon(nullptr);
errno = save_errno;
}
return rc;
}
static Result<Success> do_symlink(const BuiltinArguments& args) {
if (MakeSymlink(args[1], args[2]) < 0) {
// The symlink builtin is often used to create symlinks for older devices to be backwards
// compatible with new paths, therefore we skip reporting this error.
if (errno == EEXIST && android::base::GetMinimumLogSeverity() > android::base::DEBUG) {
return Success();
}
return ErrnoError() << "symlink() failed";
}
return Success();
}
static Result<Success> do_rm(const BuiltinArguments& args) {
if (unlink(args[1].c_str()) < 0) {
return ErrnoError() << "unlink() failed";
}
return Success();
}
static Result<Success> do_rmdir(const BuiltinArguments& args) {
if (rmdir(args[1].c_str()) < 0) {
return ErrnoError() << "rmdir() failed";
}
return Success();
}
static Result<Success> do_sysclktz(const BuiltinArguments& args) {
struct timezone tz = {};
if (!android::base::ParseInt(args[1], &tz.tz_minuteswest)) {
return Error() << "Unable to parse mins_west_of_gmt";
}
if (settimeofday(nullptr, &tz) == -1) {
return ErrnoError() << "settimeofday() failed";
}
return Success();
}
static Result<Success> do_verity_load_state(const BuiltinArguments& args) {
int mode = -1;
bool loaded = fs_mgr_load_verity_state(&mode);
if (loaded && mode != VERITY_MODE_DEFAULT) {
ActionManager::GetInstance().QueueEventTrigger("verity-logging");
}
if (!loaded) return Error() << "Could not load verity state";
return Success();
}
static void verity_update_property(fstab_rec *fstab, const char *mount_point,
int mode, int status) {
property_set("partition."s + mount_point + ".verified", std::to_string(mode));
}
static Result<Success> do_verity_update_state(const BuiltinArguments& args) {
if (!fs_mgr_update_verity_state(verity_update_property)) {
return Error() << "fs_mgr_update_verity_state() failed";
}
return Success();
}
static Result<Success> do_write(const BuiltinArguments& args) {
if (auto result = WriteFile(args[1], args[2]); !result) {
return Error() << "Unable to write to file '" << args[1] << "': " << result.error();
}
return Success();
}
static Result<Success> readahead_file(const std::string& filename, bool fully) {
android::base::unique_fd fd(TEMP_FAILURE_RETRY(open(filename.c_str(), O_RDONLY)));
if (fd == -1) {
return ErrnoError() << "Error opening file";
}
if (posix_fadvise(fd, 0, 0, POSIX_FADV_WILLNEED)) {
return ErrnoError() << "Error posix_fadvise file";
}
if (readahead(fd, 0, std::numeric_limits<size_t>::max())) {
return ErrnoError() << "Error readahead file";
}
if (fully) {
char buf[BUFSIZ];
ssize_t n;
while ((n = TEMP_FAILURE_RETRY(read(fd, &buf[0], sizeof(buf)))) > 0) {
}
if (n != 0) {
return ErrnoError() << "Error reading file";
}
}
return Success();
}
static Result<Success> do_readahead(const BuiltinArguments& args) {
struct stat sb;
if (stat(args[1].c_str(), &sb)) {
return ErrnoError() << "Error opening " << args[1];
}
bool readfully = false;
if (args.size() == 3 && args[2] == "--fully") {
readfully = true;
}
// We will do readahead in a forked process in order not to block init
// since it may block while it reads the
// filesystem metadata needed to locate the requested blocks. This
// occurs frequently with ext[234] on large files using indirect blocks
// instead of extents, giving the appearance that the call blocks until
// the requested data has been read.
pid_t pid = fork();
if (pid == 0) {
if (setpriority(PRIO_PROCESS, 0, static_cast<int>(ANDROID_PRIORITY_LOWEST)) != 0) {
PLOG(WARNING) << "setpriority failed";
}
if (android_set_ioprio(0, IoSchedClass_IDLE, 7)) {
PLOG(WARNING) << "ioprio_get failed";
}
android::base::Timer t;
if (S_ISREG(sb.st_mode)) {
if (auto result = readahead_file(args[1], readfully); !result) {
LOG(WARNING) << "Unable to readahead '" << args[1] << "': " << result.error();
_exit(EXIT_FAILURE);
}
} else if (S_ISDIR(sb.st_mode)) {
char* paths[] = {const_cast<char*>(args[1].data()), nullptr};
std::unique_ptr<FTS, decltype(&fts_close)> fts(
fts_open(paths, FTS_PHYSICAL | FTS_NOCHDIR | FTS_XDEV, nullptr), fts_close);
if (!fts) {
PLOG(ERROR) << "Error opening directory: " << args[1];
_exit(EXIT_FAILURE);
}
// Traverse the entire hierarchy and do readahead
for (FTSENT* ftsent = fts_read(fts.get()); ftsent != nullptr;
ftsent = fts_read(fts.get())) {
if (ftsent->fts_info & FTS_F) {
const std::string filename = ftsent->fts_accpath;
if (auto result = readahead_file(filename, readfully); !result) {
LOG(WARNING)
<< "Unable to readahead '" << filename << "': " << result.error();
}
}
}
}
LOG(INFO) << "Readahead " << args[1] << " took " << t << " asynchronously";
_exit(0);
} else if (pid < 0) {
return ErrnoError() << "Fork failed";
}
return Success();
}
static Result<Success> do_copy(const BuiltinArguments& args) {
auto file_contents = ReadFile(args[1]);
if (!file_contents) {
return Error() << "Could not read input file '" << args[1] << "': " << file_contents.error();
}
if (auto result = WriteFile(args[2], *file_contents); !result) {
return Error() << "Could not write to output file '" << args[2] << "': " << result.error();
}
return Success();
}
static Result<Success> do_chown(const BuiltinArguments& args) {
auto uid = DecodeUid(args[1]);
if (!uid) {
return Error() << "Unable to decode UID for '" << args[1] << "': " << uid.error();
}
// GID is optional and pushes the index of path out by one if specified.
const std::string& path = (args.size() == 4) ? args[3] : args[2];
Result<gid_t> gid = -1;
if (args.size() == 4) {
gid = DecodeUid(args[2]);
if (!gid) {
return Error() << "Unable to decode GID for '" << args[2] << "': " << gid.error();
}
}
if (lchown(path.c_str(), *uid, *gid) == -1) {
return ErrnoError() << "lchown() failed";
}
return Success();
}
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 Result<Success> do_chmod(const BuiltinArguments& args) {
mode_t mode = get_mode(args[1].c_str());
if (fchmodat(AT_FDCWD, args[2].c_str(), mode, AT_SYMLINK_NOFOLLOW) < 0) {
return ErrnoError() << "fchmodat() failed";
}
return Success();
}
static Result<Success> do_restorecon(const BuiltinArguments& 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) {
return Error() << "flags must precede paths";
}
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) {
return Error() << "bad flag " << args[i];
}
} else {
in_flags = false;
if (selinux_android_restorecon(args[i].c_str(), flag) < 0) {
ret = errno;
}
}
}
if (ret) return ErrnoError() << "selinux_android_restorecon() failed";
return Success();
}
static Result<Success> do_restorecon_recursive(const BuiltinArguments& args) {
std::vector<std::string> non_const_args(args.args);
non_const_args.insert(std::next(non_const_args.begin()), "--recursive");
return do_restorecon({std::move(non_const_args), args.context});
}
static Result<Success> do_loglevel(const BuiltinArguments& 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:
return Error() << "invalid log level " << log_level;
}
android::base::SetMinimumLogSeverity(severity);
return Success();
}
static Result<Success> do_load_persist_props(const BuiltinArguments& args) {
load_persist_props();
return Success();
}
static Result<Success> do_load_system_props(const BuiltinArguments& args) {
load_system_props();
return Success();
}
static Result<Success> do_wait(const BuiltinArguments& args) {
auto timeout = kCommandRetryTimeout;
if (args.size() == 3) {
int timeout_int;
if (!android::base::ParseInt(args[2], &timeout_int)) {
return Error() << "failed to parse timeout";
}
timeout = std::chrono::seconds(timeout_int);
}
if (wait_for_file(args[1].c_str(), timeout) != 0) {
return Error() << "wait_for_file() failed";
}
return Success();
}
static Result<Success> do_wait_for_prop(const BuiltinArguments& 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)) {
return Error() << "is_legal_property_name(" << name << ") failed";
}
if (value_len >= PROP_VALUE_MAX) {
return Error() << "value too long";
}
if (!start_waiting_for_property(name, value)) {
return Error() << "already waiting for a property";
}
return Success();
}
static bool is_file_crypto() {
return android::base::GetProperty("ro.crypto.type", "") == "file";
}
static Result<Success> do_installkey(const BuiltinArguments& args) {
if (!is_file_crypto()) return Success();
auto unencrypted_dir = args[1] + e4crypt_unencrypted_folder;
if (!make_dir(unencrypted_dir, 0700) && errno != EEXIST) {
return ErrnoError() << "Failed to create " << unencrypted_dir;
}
std::vector<std::string> exec_args = {"exec", "/system/bin/vdc", "--wait", "cryptfs",
"enablefilecrypto"};
return do_exec({std::move(exec_args), args.context});
}
static Result<Success> do_init_user0(const BuiltinArguments& args) {
std::vector<std::string> exec_args = {"exec", "/system/bin/vdc", "--wait", "cryptfs",
"init_user0"};
return do_exec({std::move(exec_args), args.context});
}
const 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, {false, do_bootchart}}},
{"chmod", {2, 2, {true, do_chmod}}},
{"chown", {2, 3, {true, do_chown}}},
{"class_reset", {1, 1, {false, do_class_reset}}},
{"class_restart", {1, 1, {false, do_class_restart}}},
{"class_start", {1, 1, {false, do_class_start}}},
{"class_stop", {1, 1, {false, do_class_stop}}},
{"copy", {2, 2, {true, do_copy}}},
{"domainname", {1, 1, {true, do_domainname}}},
{"enable", {1, 1, {false, do_enable}}},
{"exec", {1, kMax, {false, do_exec}}},
{"exec_background", {1, kMax, {false, do_exec_background}}},
{"exec_start", {1, 1, {false, do_exec_start}}},
{"export", {2, 2, {false, do_export}}},
{"hostname", {1, 1, {true, do_hostname}}},
{"ifup", {1, 1, {true, do_ifup}}},
{"init_user0", {0, 0, {false, do_init_user0}}},
{"insmod", {1, kMax, {true, do_insmod}}},
{"installkey", {1, 1, {false, do_installkey}}},
{"load_persist_props", {0, 0, {false, do_load_persist_props}}},
{"load_system_props", {0, 0, {false, do_load_system_props}}},
{"loglevel", {1, 1, {false, do_loglevel}}},
{"mkdir", {1, 4, {true, do_mkdir}}},
{"mount_all", {1, kMax, {false, do_mount_all}}},
{"mount", {3, kMax, {false, do_mount}}},
{"umount", {1, 1, {false, do_umount}}},
{"readahead", {1, 2, {true, do_readahead}}},
{"restart", {1, 1, {false, do_restart}}},
{"restorecon", {1, kMax, {true, do_restorecon}}},
{"restorecon_recursive", {1, kMax, {true, do_restorecon_recursive}}},
{"rm", {1, 1, {true, do_rm}}},
{"rmdir", {1, 1, {true, do_rmdir}}},
// TODO: setprop should be run in the subcontext, but property service needs to be split
// out from init before that is possible.
{"setprop", {2, 2, {false, do_setprop}}},
{"setrlimit", {3, 3, {false, do_setrlimit}}},
{"start", {1, 1, {false, do_start}}},
{"stop", {1, 1, {false, do_stop}}},
{"swapon_all", {1, 1, {false, do_swapon_all}}},
{"symlink", {2, 2, {true, do_symlink}}},
{"sysclktz", {1, 1, {false, do_sysclktz}}},
{"trigger", {1, 1, {false, do_trigger}}},
{"verity_load_state", {0, 0, {false, do_verity_load_state}}},
{"verity_update_state", {0, 0, {false, do_verity_update_state}}},
{"wait", {1, 2, {true, do_wait}}},
{"wait_for_prop", {2, 2, {false, do_wait_for_prop}}},
{"write", {2, 2, {true, do_write}}},
};
// clang-format on
return builtin_functions;
}
} // namespace init
} // namespace android
