| /* |
| * 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_manager.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) { |
| LOG(ERROR) << "Rebooting into recovery"; |
| 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())) { |
| return reboot_into_recovery( |
| {"--prompt_and_wipe_data", "--reason=set_policy_failed:"s + args[1]}); |
| } |
| } |
| 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" }; |
| return 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 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"); |
| |
| // Although encrypted, vold has already set the device up, 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_NEEDS_METADATA_ENCRYPTION) { |
| if (e4crypt_install_keyring()) { |
| return Error() << "e4crypt_install_keyring() failed"; |
| } |
| property_set("ro.crypto.state", "encrypted"); |
| property_set("ro.crypto.type", "file"); |
| |
| // Although encrypted, vold has already set the device up, so we do not need to |
| // do anything different from the nonencrypted case. |
| ActionManager::GetInstance().QueueEventTrigger("nonencrypted"); |
| 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 (!IsLegalPropertyName(name)) { |
| return Error() << "IsLegalPropertyName(" << 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> ExecWithRebootOnFailure(const std::string& reboot_reason, |
| const BuiltinArguments& args) { |
| auto service = Service::MakeTemporaryOneshotService(args.args); |
| if (!service) { |
| return Error() << "Could not create exec service"; |
| } |
| service->AddReapCallback([reboot_reason](const siginfo_t& siginfo) { |
| if (siginfo.si_code != CLD_EXITED || siginfo.si_status != 0) { |
| if (e4crypt_is_native()) { |
| LOG(ERROR) << "Rebooting into recovery, reason: " << reboot_reason; |
| reboot_into_recovery({"--prompt_and_wipe_data", "--reason="s + reboot_reason}); |
| } else { |
| LOG(ERROR) << "Failure (reboot suppressed): " << reboot_reason; |
| } |
| } |
| }); |
| 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_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; |
| } |
| return ExecWithRebootOnFailure( |
| "enablefilecrypto_failed", |
| {{"exec", "/system/bin/vdc", "--wait", "cryptfs", "enablefilecrypto"}, args.context}); |
| } |
| |
| static Result<Success> do_init_user0(const BuiltinArguments& args) { |
| return ExecWithRebootOnFailure( |
| "init_user0_failed", |
| {{"exec", "/system/bin/vdc", "--wait", "cryptfs", "init_user0"}, args.context}); |
| } |
| |
| // Builtin-function-map start |
| 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}}}, |
| // TODO: Do mount operations in vendor_init. |
| // mount_all is currently too complex to run in vendor_init as it queues action triggers, |
| // imports rc scripts, etc. It should be simplified and run in vendor_init context. |
| // mount and umount are run in the same context as mount_all for symmetry. |
| {"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}}}, |
| {"setprop", {2, 2, {true, 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; |
| } |
| // Builtin-function-map end |
| |
| } // namespace init |
| } // namespace android |
