857 lines
21 KiB
C++
857 lines
21 KiB
C++
/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include <errno.h>
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#include <fcntl.h>
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#include <net/if.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <sys/socket.h>
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#include <sys/mount.h>
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#include <sys/resource.h>
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#include <sys/time.h>
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <sys/wait.h>
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#include <unistd.h>
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#include <linux/loop.h>
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#include <ext4_crypt_init_extensions.h>
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#include <selinux/selinux.h>
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#include <selinux/label.h>
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#include <fs_mgr.h>
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#include <base/stringprintf.h>
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#include <cutils/partition_utils.h>
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#include <cutils/android_reboot.h>
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#include <private/android_filesystem_config.h>
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#include "init.h"
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#include "keywords.h"
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#include "property_service.h"
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#include "devices.h"
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#include "init_parser.h"
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#include "util.h"
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#include "log.h"
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#define chmod DO_NOT_USE_CHMOD_USE_FCHMODAT_SYMLINK_NOFOLLOW
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int add_environment(const char *name, const char *value);
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// System call provided by bionic but not in any header file.
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extern "C" int init_module(void *, unsigned long, const char *);
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static int insmod(const char *filename, char *options)
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{
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char filename_val[PROP_VALUE_MAX];
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if (expand_props(filename_val, filename, sizeof(filename_val)) == -1) {
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ERROR("insmod: cannot expand '%s'\n", filename);
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return -EINVAL;
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}
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std::string module;
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if (!read_file(filename_val, &module)) {
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return -1;
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}
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// TODO: use finit_module for >= 3.8 kernels.
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return init_module(&module[0], module.size(), options);
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}
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static int __ifupdown(const char *interface, int up)
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{
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struct ifreq ifr;
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int s, ret;
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strlcpy(ifr.ifr_name, interface, IFNAMSIZ);
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s = socket(AF_INET, SOCK_DGRAM, 0);
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if (s < 0)
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return -1;
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ret = ioctl(s, SIOCGIFFLAGS, &ifr);
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if (ret < 0) {
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goto done;
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}
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if (up)
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ifr.ifr_flags |= IFF_UP;
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else
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ifr.ifr_flags &= ~IFF_UP;
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ret = ioctl(s, SIOCSIFFLAGS, &ifr);
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done:
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close(s);
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return ret;
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}
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static void service_start_if_not_disabled(struct service *svc)
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{
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if (!(svc->flags & SVC_DISABLED)) {
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service_start(svc, NULL);
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} else {
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svc->flags |= SVC_DISABLED_START;
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}
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}
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int do_class_start(int nargs, char **args)
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{
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/* Starting a class does not start services
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* which are explicitly disabled. They must
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* be started individually.
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*/
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service_for_each_class(args[1], service_start_if_not_disabled);
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return 0;
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}
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int do_class_stop(int nargs, char **args)
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{
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service_for_each_class(args[1], service_stop);
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return 0;
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}
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int do_class_reset(int nargs, char **args)
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{
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service_for_each_class(args[1], service_reset);
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return 0;
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}
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int do_domainname(int nargs, char **args)
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{
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return write_file("/proc/sys/kernel/domainname", args[1]);
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}
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int do_enable(int nargs, char **args)
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{
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struct service *svc;
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svc = service_find_by_name(args[1]);
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if (svc) {
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svc->flags &= ~(SVC_DISABLED | SVC_RC_DISABLED);
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if (svc->flags & SVC_DISABLED_START) {
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service_start(svc, NULL);
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}
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} else {
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return -1;
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}
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return 0;
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}
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int do_exec(int nargs, char** args) {
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service* svc = make_exec_oneshot_service(nargs, args);
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if (svc == NULL) {
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return -1;
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}
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service_start(svc, NULL);
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return 0;
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}
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int do_export(int nargs, char **args)
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{
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return add_environment(args[1], args[2]);
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}
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int do_hostname(int nargs, char **args)
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{
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return write_file("/proc/sys/kernel/hostname", args[1]);
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}
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int do_ifup(int nargs, char **args)
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{
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return __ifupdown(args[1], 1);
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}
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static int do_insmod_inner(int nargs, char **args, int opt_len)
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{
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char options[opt_len + 1];
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int i;
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options[0] = '\0';
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if (nargs > 2) {
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strcpy(options, args[2]);
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for (i = 3; i < nargs; ++i) {
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strcat(options, " ");
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strcat(options, args[i]);
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}
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}
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return insmod(args[1], options);
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}
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int do_insmod(int nargs, char **args)
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{
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int i;
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int size = 0;
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if (nargs > 2) {
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for (i = 2; i < nargs; ++i)
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size += strlen(args[i]) + 1;
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}
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return do_insmod_inner(nargs, args, size);
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}
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int do_mkdir(int nargs, char **args)
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{
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mode_t mode = 0755;
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int ret;
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/* mkdir <path> [mode] [owner] [group] */
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if (nargs >= 3) {
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mode = strtoul(args[2], 0, 8);
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}
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ret = make_dir(args[1], mode);
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/* chmod in case the directory already exists */
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if (ret == -1 && errno == EEXIST) {
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ret = fchmodat(AT_FDCWD, args[1], mode, AT_SYMLINK_NOFOLLOW);
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}
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if (ret == -1) {
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return -errno;
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}
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if (nargs >= 4) {
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uid_t uid = decode_uid(args[3]);
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gid_t gid = -1;
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if (nargs == 5) {
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gid = decode_uid(args[4]);
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}
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if (lchown(args[1], uid, gid) == -1) {
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return -errno;
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}
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/* chown may have cleared S_ISUID and S_ISGID, chmod again */
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if (mode & (S_ISUID | S_ISGID)) {
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ret = fchmodat(AT_FDCWD, args[1], mode, AT_SYMLINK_NOFOLLOW);
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if (ret == -1) {
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return -errno;
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}
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}
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}
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return e4crypt_set_directory_policy(args[1]);
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}
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static struct {
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const char *name;
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unsigned flag;
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} mount_flags[] = {
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{ "noatime", MS_NOATIME },
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{ "noexec", MS_NOEXEC },
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{ "nosuid", MS_NOSUID },
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{ "nodev", MS_NODEV },
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{ "nodiratime", MS_NODIRATIME },
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{ "ro", MS_RDONLY },
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{ "rw", 0 },
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{ "remount", MS_REMOUNT },
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{ "bind", MS_BIND },
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{ "rec", MS_REC },
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{ "unbindable", MS_UNBINDABLE },
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{ "private", MS_PRIVATE },
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{ "slave", MS_SLAVE },
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{ "shared", MS_SHARED },
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{ "defaults", 0 },
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{ 0, 0 },
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};
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#define DATA_MNT_POINT "/data"
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/* mount <type> <device> <path> <flags ...> <options> */
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int do_mount(int nargs, char **args)
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{
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char tmp[64];
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char *source, *target, *system;
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char *options = NULL;
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unsigned flags = 0;
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int n, i;
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int wait = 0;
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for (n = 4; n < nargs; n++) {
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for (i = 0; mount_flags[i].name; i++) {
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if (!strcmp(args[n], mount_flags[i].name)) {
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flags |= mount_flags[i].flag;
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break;
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}
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}
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if (!mount_flags[i].name) {
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if (!strcmp(args[n], "wait"))
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wait = 1;
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/* if our last argument isn't a flag, wolf it up as an option string */
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else if (n + 1 == nargs)
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options = args[n];
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}
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}
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system = args[1];
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source = args[2];
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target = args[3];
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if (!strncmp(source, "mtd@", 4)) {
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n = mtd_name_to_number(source + 4);
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if (n < 0) {
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return -1;
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}
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snprintf(tmp, sizeof(tmp), "/dev/block/mtdblock%d", n);
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if (wait)
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wait_for_file(tmp, COMMAND_RETRY_TIMEOUT);
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if (mount(tmp, target, system, flags, options) < 0) {
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return -1;
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}
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goto exit_success;
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} else if (!strncmp(source, "loop@", 5)) {
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int mode, loop, fd;
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struct loop_info info;
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mode = (flags & MS_RDONLY) ? O_RDONLY : O_RDWR;
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fd = open(source + 5, mode | O_CLOEXEC);
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if (fd < 0) {
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return -1;
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}
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for (n = 0; ; n++) {
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snprintf(tmp, sizeof(tmp), "/dev/block/loop%d", n);
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loop = open(tmp, mode | O_CLOEXEC);
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if (loop < 0) {
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close(fd);
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return -1;
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}
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/* if it is a blank loop device */
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if (ioctl(loop, LOOP_GET_STATUS, &info) < 0 && errno == ENXIO) {
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/* if it becomes our loop device */
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if (ioctl(loop, LOOP_SET_FD, fd) >= 0) {
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close(fd);
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if (mount(tmp, target, system, flags, options) < 0) {
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ioctl(loop, LOOP_CLR_FD, 0);
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close(loop);
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return -1;
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}
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close(loop);
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goto exit_success;
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}
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}
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close(loop);
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}
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close(fd);
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ERROR("out of loopback devices");
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return -1;
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} else {
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if (wait)
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wait_for_file(source, COMMAND_RETRY_TIMEOUT);
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if (mount(source, target, system, flags, options) < 0) {
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return -1;
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}
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}
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exit_success:
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return 0;
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}
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static int wipe_data_via_recovery()
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{
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mkdir("/cache/recovery", 0700);
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int fd = open("/cache/recovery/command", O_RDWR|O_CREAT|O_TRUNC|O_CLOEXEC, 0600);
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if (fd >= 0) {
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write(fd, "--wipe_data\n", strlen("--wipe_data\n") + 1);
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write(fd, "--reason=wipe_data_via_recovery\n", strlen("--reason=wipe_data_via_recovery\n") + 1);
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close(fd);
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} else {
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ERROR("could not open /cache/recovery/command\n");
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return -1;
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}
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android_reboot(ANDROID_RB_RESTART2, 0, "recovery");
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while (1) { pause(); } // never reached
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}
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/*
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* This function might request a reboot, in which case it will
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* not return.
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*/
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int do_mount_all(int nargs, char **args)
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{
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pid_t pid;
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int ret = -1;
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int child_ret = -1;
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int status;
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struct fstab *fstab;
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if (nargs != 2) {
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return -1;
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}
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/*
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* Call fs_mgr_mount_all() to mount all filesystems. We fork(2) and
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* do the call in the child to provide protection to the main init
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* process if anything goes wrong (crash or memory leak), and wait for
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* the child to finish in the parent.
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*/
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pid = fork();
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if (pid > 0) {
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/* Parent. Wait for the child to return */
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int wp_ret = TEMP_FAILURE_RETRY(waitpid(pid, &status, 0));
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if (wp_ret < 0) {
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/* Unexpected error code. We will continue anyway. */
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NOTICE("waitpid failed rc=%d: %s\n", wp_ret, strerror(errno));
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}
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if (WIFEXITED(status)) {
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ret = WEXITSTATUS(status);
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} else {
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ret = -1;
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}
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} else if (pid == 0) {
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/* child, call fs_mgr_mount_all() */
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klog_set_level(6); /* So we can see what fs_mgr_mount_all() does */
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fstab = fs_mgr_read_fstab(args[1]);
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child_ret = fs_mgr_mount_all(fstab);
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fs_mgr_free_fstab(fstab);
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if (child_ret == -1) {
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ERROR("fs_mgr_mount_all returned an error\n");
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}
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_exit(child_ret);
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} else {
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/* fork failed, return an error */
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return -1;
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}
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if (ret == FS_MGR_MNTALL_DEV_NEEDS_ENCRYPTION) {
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property_set("vold.decrypt", "trigger_encryption");
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} else if (ret == FS_MGR_MNTALL_DEV_MIGHT_BE_ENCRYPTED) {
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property_set("ro.crypto.state", "encrypted");
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property_set("ro.crypto.type", "block");
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property_set("vold.decrypt", "trigger_default_encryption");
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} else if (ret == FS_MGR_MNTALL_DEV_NOT_ENCRYPTED) {
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property_set("ro.crypto.state", "unencrypted");
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/* If fs_mgr determined this is an unencrypted device, then trigger
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* that action.
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*/
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action_for_each_trigger("nonencrypted", action_add_queue_tail);
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} else if (ret == FS_MGR_MNTALL_DEV_NEEDS_RECOVERY) {
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/* Setup a wipe via recovery, and reboot into recovery */
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ERROR("fs_mgr_mount_all suggested recovery, so wiping data via recovery.\n");
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ret = wipe_data_via_recovery();
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/* If reboot worked, there is no return. */
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} else if (ret == FS_MGR_MNTALL_DEV_DEFAULT_FILE_ENCRYPTED) {
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if (e4crypt_install_keyring()) {
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return -1;
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}
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property_set("ro.crypto.state", "encrypted");
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property_set("ro.crypto.type", "file");
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// Although encrypted, we have device key, so we do not need to
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// do anything different from the nonencrypted case.
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action_for_each_trigger("nonencrypted", action_add_queue_tail);
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} else if (ret == FS_MGR_MNTALL_DEV_NON_DEFAULT_FILE_ENCRYPTED) {
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if (e4crypt_install_keyring()) {
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return -1;
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}
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property_set("ro.crypto.state", "encrypted");
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property_set("ro.crypto.type", "file");
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property_set("vold.decrypt", "trigger_restart_min_framework");
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} else if (ret > 0) {
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ERROR("fs_mgr_mount_all returned unexpected error %d\n", ret);
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}
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/* else ... < 0: error */
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return ret;
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}
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int do_swapon_all(int nargs, char **args)
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{
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struct fstab *fstab;
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int ret;
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fstab = fs_mgr_read_fstab(args[1]);
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ret = fs_mgr_swapon_all(fstab);
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fs_mgr_free_fstab(fstab);
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return ret;
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}
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int do_setprop(int nargs, char **args)
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{
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const char *name = args[1];
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const char *value = args[2];
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char prop_val[PROP_VALUE_MAX];
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int ret;
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ret = expand_props(prop_val, value, sizeof(prop_val));
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if (ret) {
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ERROR("cannot expand '%s' while assigning to '%s'\n", value, name);
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return -EINVAL;
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}
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property_set(name, prop_val);
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return 0;
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}
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int do_setrlimit(int nargs, char **args)
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{
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struct rlimit limit;
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int resource;
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resource = atoi(args[1]);
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limit.rlim_cur = atoi(args[2]);
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limit.rlim_max = atoi(args[3]);
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return setrlimit(resource, &limit);
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}
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int do_start(int nargs, char **args)
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{
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struct service *svc;
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svc = service_find_by_name(args[1]);
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if (svc) {
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service_start(svc, NULL);
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}
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return 0;
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}
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int do_stop(int nargs, char **args)
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{
|
|
struct service *svc;
|
|
svc = service_find_by_name(args[1]);
|
|
if (svc) {
|
|
service_stop(svc);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int do_restart(int nargs, char **args)
|
|
{
|
|
struct service *svc;
|
|
svc = service_find_by_name(args[1]);
|
|
if (svc) {
|
|
service_restart(svc);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int do_powerctl(int nargs, char **args)
|
|
{
|
|
char command[PROP_VALUE_MAX];
|
|
int res;
|
|
int len = 0;
|
|
int cmd = 0;
|
|
const char *reboot_target;
|
|
|
|
res = expand_props(command, args[1], sizeof(command));
|
|
if (res) {
|
|
ERROR("powerctl: cannot expand '%s'\n", args[1]);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (strncmp(command, "shutdown", 8) == 0) {
|
|
cmd = ANDROID_RB_POWEROFF;
|
|
len = 8;
|
|
} else if (strncmp(command, "reboot", 6) == 0) {
|
|
cmd = ANDROID_RB_RESTART2;
|
|
len = 6;
|
|
} else {
|
|
ERROR("powerctl: unrecognized command '%s'\n", command);
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (command[len] == ',') {
|
|
reboot_target = &command[len + 1];
|
|
} else if (command[len] == '\0') {
|
|
reboot_target = "";
|
|
} else {
|
|
ERROR("powerctl: unrecognized reboot target '%s'\n", &command[len]);
|
|
return -EINVAL;
|
|
}
|
|
|
|
return android_reboot(cmd, 0, reboot_target);
|
|
}
|
|
|
|
int do_trigger(int nargs, char **args)
|
|
{
|
|
char prop_val[PROP_VALUE_MAX];
|
|
int res = expand_props(prop_val, args[1], sizeof(prop_val));
|
|
if (res) {
|
|
ERROR("trigger: cannot expand '%s'\n", args[1]);
|
|
return -EINVAL;
|
|
}
|
|
action_for_each_trigger(prop_val, action_add_queue_tail);
|
|
return 0;
|
|
}
|
|
|
|
int do_symlink(int nargs, char **args)
|
|
{
|
|
return symlink(args[1], args[2]);
|
|
}
|
|
|
|
int do_rm(int nargs, char **args)
|
|
{
|
|
return unlink(args[1]);
|
|
}
|
|
|
|
int do_rmdir(int nargs, char **args)
|
|
{
|
|
return rmdir(args[1]);
|
|
}
|
|
|
|
int do_sysclktz(int nargs, char **args)
|
|
{
|
|
struct timezone tz;
|
|
|
|
if (nargs != 2)
|
|
return -1;
|
|
|
|
memset(&tz, 0, sizeof(tz));
|
|
tz.tz_minuteswest = atoi(args[1]);
|
|
if (settimeofday(NULL, &tz))
|
|
return -1;
|
|
return 0;
|
|
}
|
|
|
|
int do_verity_load_state(int nargs, char **args) {
|
|
int mode = -1;
|
|
int rc = fs_mgr_load_verity_state(&mode);
|
|
if (rc == 0 && mode == VERITY_MODE_LOGGING) {
|
|
action_for_each_trigger("verity-logging", action_add_queue_tail);
|
|
}
|
|
return rc;
|
|
}
|
|
|
|
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());
|
|
}
|
|
|
|
int do_verity_update_state(int nargs, char** args) {
|
|
return fs_mgr_update_verity_state(verity_update_property);
|
|
}
|
|
|
|
int do_write(int nargs, char **args)
|
|
{
|
|
const char *path = args[1];
|
|
const char *value = args[2];
|
|
|
|
char expanded_value[256];
|
|
if (expand_props(expanded_value, value, sizeof(expanded_value))) {
|
|
ERROR("cannot expand '%s' while writing to '%s'\n", value, path);
|
|
return -EINVAL;
|
|
}
|
|
return write_file(path, expanded_value);
|
|
}
|
|
|
|
int do_copy(int nargs, char **args)
|
|
{
|
|
char *buffer = NULL;
|
|
int rc = 0;
|
|
int fd1 = -1, fd2 = -1;
|
|
struct stat info;
|
|
int brtw, brtr;
|
|
char *p;
|
|
|
|
if (nargs != 3)
|
|
return -1;
|
|
|
|
if (stat(args[1], &info) < 0)
|
|
return -1;
|
|
|
|
if ((fd1 = open(args[1], O_RDONLY|O_CLOEXEC)) < 0)
|
|
goto out_err;
|
|
|
|
if ((fd2 = open(args[2], O_WRONLY|O_CREAT|O_TRUNC|O_CLOEXEC, 0660)) < 0)
|
|
goto out_err;
|
|
|
|
if (!(buffer = (char*) malloc(info.st_size)))
|
|
goto out_err;
|
|
|
|
p = buffer;
|
|
brtr = info.st_size;
|
|
while(brtr) {
|
|
rc = read(fd1, p, brtr);
|
|
if (rc < 0)
|
|
goto out_err;
|
|
if (rc == 0)
|
|
break;
|
|
p += rc;
|
|
brtr -= rc;
|
|
}
|
|
|
|
p = buffer;
|
|
brtw = info.st_size;
|
|
while(brtw) {
|
|
rc = write(fd2, p, brtw);
|
|
if (rc < 0)
|
|
goto out_err;
|
|
if (rc == 0)
|
|
break;
|
|
p += rc;
|
|
brtw -= rc;
|
|
}
|
|
|
|
rc = 0;
|
|
goto out;
|
|
out_err:
|
|
rc = -1;
|
|
out:
|
|
if (buffer)
|
|
free(buffer);
|
|
if (fd1 >= 0)
|
|
close(fd1);
|
|
if (fd2 >= 0)
|
|
close(fd2);
|
|
return rc;
|
|
}
|
|
|
|
int do_chown(int nargs, char **args) {
|
|
/* GID is optional. */
|
|
if (nargs == 3) {
|
|
if (lchown(args[2], decode_uid(args[1]), -1) == -1)
|
|
return -errno;
|
|
} else if (nargs == 4) {
|
|
if (lchown(args[3], decode_uid(args[1]), decode_uid(args[2])) == -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;
|
|
}
|
|
|
|
int do_chmod(int nargs, char **args) {
|
|
mode_t mode = get_mode(args[1]);
|
|
if (fchmodat(AT_FDCWD, args[2], mode, AT_SYMLINK_NOFOLLOW) < 0) {
|
|
return -errno;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int do_restorecon(int nargs, char **args) {
|
|
int i;
|
|
int ret = 0;
|
|
|
|
for (i = 1; i < nargs; i++) {
|
|
if (restorecon(args[i]) < 0)
|
|
ret = -errno;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int do_restorecon_recursive(int nargs, char **args) {
|
|
int i;
|
|
int ret = 0;
|
|
|
|
for (i = 1; i < nargs; i++) {
|
|
if (restorecon_recursive(args[i]) < 0)
|
|
ret = -errno;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int do_loglevel(int nargs, char **args) {
|
|
int log_level;
|
|
char log_level_str[PROP_VALUE_MAX] = "";
|
|
if (nargs != 2) {
|
|
ERROR("loglevel: missing argument\n");
|
|
return -EINVAL;
|
|
}
|
|
|
|
if (expand_props(log_level_str, args[1], sizeof(log_level_str))) {
|
|
ERROR("loglevel: cannot expand '%s'\n", args[1]);
|
|
return -EINVAL;
|
|
}
|
|
log_level = atoi(log_level_str);
|
|
if (log_level < KLOG_ERROR_LEVEL || log_level > KLOG_DEBUG_LEVEL) {
|
|
ERROR("loglevel: invalid log level'%d'\n", log_level);
|
|
return -EINVAL;
|
|
}
|
|
klog_set_level(log_level);
|
|
return 0;
|
|
}
|
|
|
|
int do_load_persist_props(int nargs, char **args) {
|
|
if (nargs == 1) {
|
|
load_persist_props();
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
int do_load_system_props(int nargs, char **args) {
|
|
if (nargs == 1) {
|
|
load_system_props();
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
int do_wait(int nargs, char **args)
|
|
{
|
|
if (nargs == 2) {
|
|
return wait_for_file(args[1], COMMAND_RETRY_TIMEOUT);
|
|
} else if (nargs == 3) {
|
|
return wait_for_file(args[1], atoi(args[2]));
|
|
} else
|
|
return -1;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
int do_installkey(int nargs, char **args)
|
|
{
|
|
if (nargs != 2) {
|
|
return -1;
|
|
}
|
|
|
|
char prop_value[PROP_VALUE_MAX] = {0};
|
|
property_get("ro.crypto.type", prop_value);
|
|
if (strcmp(prop_value, "file")) {
|
|
return 0;
|
|
}
|
|
|
|
return e4crypt_create_device_key(args[1],
|
|
do_installkeys_ensure_dir_exists);
|
|
}
|