/*
* Copyright (C) 2007 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 <ctype.h>
#include <errno.h>
#include <fcntl.h>
#include <getopt.h>
#include <limits.h>
#include <linux/input.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/reboot.h>
#include <sys/types.h>
#include <time.h>
#include <unistd.h>
#include "bootloader.h"
#include "common.h"
#include "cutils/properties.h"
#include "firmware.h"
#include "install.h"
#include "minui/minui.h"
#include "minzip/DirUtil.h"
#include "roots.h"
#include "recovery_ui.h"
#include "efs_migration.h"
static const struct option OPTIONS[] = {
{ "send_intent", required_argument, NULL, 's' },
{ "update_package", required_argument, NULL, 'u' },
{ "wipe_data", no_argument, NULL, 'w' },
{ "wipe_cache", no_argument, NULL, 'c' },
// TODO{oam}: implement improved command line passing key, egnor to review.
{ "set_encrypted_filesystem", required_argument, NULL, 'e' },
{ NULL, 0, NULL, 0 },
};
static const char *COMMAND_FILE = "CACHE:recovery/command";
static const char *INTENT_FILE = "CACHE:recovery/intent";
static const char *LOG_FILE = "CACHE:recovery/log";
static const char *SDCARD_PACKAGE_FILE = "SDCARD:update.zip";
static const char *TEMPORARY_LOG_FILE = "/tmp/recovery.log";
/*
* The recovery tool communicates with the main system through /cache files.
* /cache/recovery/command - INPUT - command line for tool, one arg per line
* /cache/recovery/log - OUTPUT - combined log file from recovery run(s)
* /cache/recovery/intent - OUTPUT - intent that was passed in
*
* The arguments which may be supplied in the recovery.command file:
* --send_intent=anystring - write the text out to recovery.intent
* --update_package=root:path - verify install an OTA package file
* --wipe_data - erase user data (and cache), then reboot
* --wipe_cache - wipe cache (but not user data), then reboot
* --set_encrypted_filesystem=on|off - enables / diasables encrypted fs
*
* After completing, we remove /cache/recovery/command and reboot.
* Arguments may also be supplied in the bootloader control block (BCB).
* These important scenarios must be safely restartable at any point:
*
* FACTORY RESET
* 1. user selects "factory reset"
* 2. main system writes "--wipe_data" to /cache/recovery/command
* 3. main system reboots into recovery
* 4. get_args() writes BCB with "boot-recovery" and "--wipe_data"
* -- after this, rebooting will restart the erase --
* 5. erase_root() reformats /data
* 6. erase_root() reformats /cache
* 7. finish_recovery() erases BCB
* -- after this, rebooting will restart the main system --
* 8. main() calls reboot() to boot main system
*
* OTA INSTALL
* 1. main system downloads OTA package to /cache/some-filename.zip
* 2. main system writes "--update_package=CACHE:some-filename.zip"
* 3. main system reboots into recovery
* 4. get_args() writes BCB with "boot-recovery" and "--update_package=..."
* -- after this, rebooting will attempt to reinstall the update --
* 5. install_package() attempts to install the update
* NOTE: the package install must itself be restartable from any point
* 6. finish_recovery() erases BCB
* -- after this, rebooting will (try to) restart the main system --
* 7. ** if install failed **
* 7a. prompt_and_wait() shows an error icon and waits for the user
* 7b; the user reboots (pulling the battery, etc) into the main system
* 8. main() calls maybe_install_firmware_update()
* ** if the update contained radio/hboot firmware **:
* 8a. m_i_f_u() writes BCB with "boot-recovery" and "--wipe_cache"
* -- after this, rebooting will reformat cache & restart main system --
* 8b. m_i_f_u() writes firmware image into raw cache partition
* 8c. m_i_f_u() writes BCB with "update-radio/hboot" and "--wipe_cache"
* -- after this, rebooting will attempt to reinstall firmware --
* 8d. bootloader tries to flash firmware
* 8e. bootloader writes BCB with "boot-recovery" (keeping "--wipe_cache")
* -- after this, rebooting will reformat cache & restart main system --
* 8f. erase_root() reformats /cache
* 8g. finish_recovery() erases BCB
* -- after this, rebooting will (try to) restart the main system --
* 9. main() calls reboot() to boot main system
*
* ENCRYPTED FILE SYSTEMS ENABLE/DISABLE
* 1. user selects "enable encrypted file systems"
* 2. main system writes "--set_encrypted_filesystem=on|off" to
* /cache/recovery/command
* 3. main system reboots into recovery
* 4. get_args() writes BCB with "boot-recovery" and
* "--set_encrypted_filesystems=on|off"
* -- after this, rebooting will restart the transition --
* 5. read_encrypted_fs_info() retrieves encrypted file systems settings from /data
* Settings include: property to specify the Encrypted FS istatus and
* FS encryption key if enabled (not yet implemented)
* 6. erase_root() reformats /data
* 7. erase_root() reformats /cache
* 8. restore_encrypted_fs_info() writes required encrypted file systems settings to /data
* Settings include: property to specify the Encrypted FS status and
* FS encryption key if enabled (not yet implemented)
* 9. finish_recovery() erases BCB
* -- after this, rebooting will restart the main system --
* 10. main() calls reboot() to boot main system
*/
static const int MAX_ARG_LENGTH = 4096;
static const int MAX_ARGS = 100;
// open a file given in root:path format, mounting partitions as necessary
static FILE*
fopen_root_path(const char *root_path, const char *mode) {
if (ensure_root_path_mounted(root_path) != 0) {
LOGE("Can't mount %s\n", root_path);
return NULL;
}
char path[PATH_MAX] = "";
if (translate_root_path(root_path, path, sizeof(path)) == NULL) {
LOGE("Bad path %s\n", root_path);
return NULL;
}
// When writing, try to create the containing directory, if necessary.
// Use generous permissions, the system (init.rc) will reset them.
if (strchr("wa", mode[0])) dirCreateHierarchy(path, 0777, NULL, 1);
FILE *fp = fopen(path, mode);
return fp;
}
// close a file, log an error if the error indicator is set
static void
check_and_fclose(FILE *fp, const char *name) {
fflush(fp);
if (ferror(fp)) LOGE("Error in %s\n(%s)\n", name, strerror(errno));
fclose(fp);
}
// command line args come from, in decreasing precedence:
// - the actual command line
// - the bootloader control block (one per line, after "recovery")
// - the contents of COMMAND_FILE (one per line)
static void
get_args(int *argc, char ***argv) {
struct bootloader_message boot;
memset(&boot, 0, sizeof(boot));
get_bootloader_message(&boot); // this may fail, leaving a zeroed structure
if (boot.command[0] != 0 && boot.command[0] != 255) {
LOGI("Boot command: %.*s\n", sizeof(boot.command), boot.command);
}
if (boot.status[0] != 0 && boot.status[0] != 255) {
LOGI("Boot status: %.*s\n", sizeof(boot.status), boot.status);
}
// --- if arguments weren't supplied, look in the bootloader control block
if (*argc <= 1) {
boot.recovery[sizeof(boot.recovery) - 1] = '\0'; // Ensure termination
const char *arg = strtok(boot.recovery, "\n");
if (arg != NULL && !strcmp(arg, "recovery")) {
*argv = (char **) malloc(sizeof(char *) * MAX_ARGS);
(*argv)[0] = strdup(arg);
for (*argc = 1; *argc < MAX_ARGS; ++*argc) {
if ((arg = strtok(NULL, "\n")) == NULL) break;
(*argv)[*argc] = strdup(arg);
}
LOGI("Got arguments from boot message\n");
} else if (boot.recovery[0] != 0 && boot.recovery[0] != 255) {
LOGE("Bad boot message\n\"%.20s\"\n", boot.recovery);
}
}
// --- if that doesn't work, try the command file
if (*argc <= 1) {
FILE *fp = fopen_root_path(COMMAND_FILE, "r");
if (fp != NULL) {
char *argv0 = (*argv)[0];
*argv = (char **) malloc(sizeof(char *) * MAX_ARGS);
(*argv)[0] = argv0; // use the same program name
char buf[MAX_ARG_LENGTH];
for (*argc = 1; *argc < MAX_ARGS; ++*argc) {
if (!fgets(buf, sizeof(buf), fp)) break;
(*argv)[*argc] = strdup(strtok(buf, "\r\n")); // Strip newline.
}
check_and_fclose(fp, COMMAND_FILE);
LOGI("Got arguments from %s\n", COMMAND_FILE);
}
}
// --> write the arguments we have back into the bootloader control block
// always boot into recovery after this (until finish_recovery() is called)
strlcpy(boot.command, "boot-recovery", sizeof(boot.command));
strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery));
int i;
for (i = 1; i < *argc; ++i) {
strlcat(boot.recovery, (*argv)[i], sizeof(boot.recovery));
strlcat(boot.recovery, "\n", sizeof(boot.recovery));
}
set_bootloader_message(&boot);
}
static void
set_sdcard_update_bootloader_message() {
struct bootloader_message boot;
memset(&boot, 0, sizeof(boot));
strlcpy(boot.command, "boot-recovery", sizeof(boot.command));
strlcpy(boot.recovery, "recovery\n", sizeof(boot.recovery));
set_bootloader_message(&boot);
}
// clear the recovery command and prepare to boot a (hopefully working) system,
// copy our log file to cache as well (for the system to read), and
// record any intent we were asked to communicate back to the system.
// this function is idempotent: call it as many times as you like.
static void
finish_recovery(const char *send_intent) {
// By this point, we're ready to return to the main system...
if (send_intent != NULL) {
FILE *fp = fopen_root_path(INTENT_FILE, "w");
if (fp == NULL) {
LOGE("Can't open %s\n", INTENT_FILE);
} else {
fputs(send_intent, fp);
check_and_fclose(fp, INTENT_FILE);
}
}
// Copy logs to cache so the system can find out what happened.
FILE *log = fopen_root_path(LOG_FILE, "a");
if (log == NULL) {
LOGE("Can't open %s\n", LOG_FILE);
} else {
FILE *tmplog = fopen(TEMPORARY_LOG_FILE, "r");
if (tmplog == NULL) {
LOGE("Can't open %s\n", TEMPORARY_LOG_FILE);
} else {
static long tmplog_offset = 0;
fseek(tmplog, tmplog_offset, SEEK_SET); // Since last write
char buf[4096];
while (fgets(buf, sizeof(buf), tmplog)) fputs(buf, log);
tmplog_offset = ftell(tmplog);
check_and_fclose(tmplog, TEMPORARY_LOG_FILE);
}
check_and_fclose(log, LOG_FILE);
}
// Reset to mormal system boot so recovery won't cycle indefinitely.
struct bootloader_message boot;
memset(&boot, 0, sizeof(boot));
set_bootloader_message(&boot);
// Remove the command file, so recovery won't repeat indefinitely.
char path[PATH_MAX] = "";
if (ensure_root_path_mounted(COMMAND_FILE) != 0 ||
translate_root_path(COMMAND_FILE, path, sizeof(path)) == NULL ||
(unlink(path) && errno != ENOENT)) {
LOGW("Can't unlink %s\n", COMMAND_FILE);
}
sync(); // For good measure.
}
static int
erase_root(const char *root) {
ui_set_background(BACKGROUND_ICON_INSTALLING);
ui_show_indeterminate_progress();
ui_print("Formatting %s...\n", root);
return format_root_device(root);
}
static char**
prepend_title(char** headers) {
char* title[] = { "Android system recovery <"
EXPAND(RECOVERY_API_VERSION) "e>",
"",
NULL };
// count the number of lines in our title, plus the
// caller-provided headers.
int count = 0;
char** p;
for (p = title; *p; ++p, ++count);
for (p = headers; *p; ++p, ++count);
char** new_headers = malloc((count+1) * sizeof(char*));
char** h = new_headers;
for (p = title; *p; ++p, ++h) *h = *p;
for (p = headers; *p; ++p, ++h) *h = *p;
*h = NULL;
return new_headers;
}
static int
get_menu_selection(char** headers, char** items, int menu_only) {
// throw away keys pressed previously, so user doesn't
// accidentally trigger menu items.
ui_clear_key_queue();
ui_start_menu(headers, items);
int selected = 0;
int chosen_item = -1;
while (chosen_item < 0) {
int key = ui_wait_key();
int visible = ui_text_visible();
int action = device_handle_key(key, visible);
if (action < 0) {
switch (action) {
case HIGHLIGHT_UP:
--selected;
selected = ui_menu_select(selected);
break;
case HIGHLIGHT_DOWN:
++selected;
selected = ui_menu_select(selected);
break;
case SELECT_ITEM:
chosen_item = selected;
break;
case NO_ACTION:
break;
}
} else if (!menu_only) {
chosen_item = action;
}
}
ui_end_menu();
return chosen_item;
}
static void
wipe_data(int confirm) {
if (confirm) {
static char** title_headers = NULL;
if (title_headers == NULL) {
char* headers[] = { "Confirm wipe of all user data?",
" THIS CAN NOT BE UNDONE.",
"",
NULL };
title_headers = prepend_title(headers);
}
char* items[] = { " No",
" No",
" No",
" No",
" No",
" No",
" No",
" Yes -- delete all user data", // [7]
" No",
" No",
" No",
NULL };
int chosen_item = get_menu_selection(title_headers, items, 1);
if (chosen_item != 7) {
return;
}
}
ui_print("\n-- Wiping data...\n");
device_wipe_data();
erase_root("DATA:");
erase_root("CACHE:");
ui_print("Data wipe complete.\n");
}
static void
prompt_and_wait() {
char** headers = prepend_title(MENU_HEADERS);
for (;;) {
finish_recovery(NULL);
ui_reset_progress();
int chosen_item = get_menu_selection(headers, MENU_ITEMS, 0);
// device-specific code may take some action here. It may
// return one of the core actions handled in the switch
// statement below.
chosen_item = device_perform_action(chosen_item);
switch (chosen_item) {
case ITEM_REBOOT:
return;
case ITEM_WIPE_DATA:
wipe_data(ui_text_visible());
if (!ui_text_visible()) return;
break;
case ITEM_WIPE_CACHE:
ui_print("\n-- Wiping cache...\n");
erase_root("CACHE:");
ui_print("Cache wipe complete.\n");
if (!ui_text_visible()) return;
break;
case ITEM_APPLY_SDCARD:
ui_print("\n-- Install from sdcard...\n");
set_sdcard_update_bootloader_message();
int status = install_package(SDCARD_PACKAGE_FILE);
if (status != INSTALL_SUCCESS) {
ui_set_background(BACKGROUND_ICON_ERROR);
ui_print("Installation aborted.\n");
} else if (!ui_text_visible()) {
return; // reboot if logs aren't visible
} else {
if (firmware_update_pending()) {
ui_print("\nReboot via menu to complete\n"
"installation.\n");
} else {
ui_print("\nInstall from sdcard complete.\n");
}
}
break;
}
}
}
static void
print_property(const char *key, const char *name, void *cookie) {
fprintf(stderr, "%s=%s\n", key, name);
}
int
main(int argc, char **argv) {
time_t start = time(NULL);
// If these fail, there's not really anywhere to complain...
freopen(TEMPORARY_LOG_FILE, "a", stdout); setbuf(stdout, NULL);
freopen(TEMPORARY_LOG_FILE, "a", stderr); setbuf(stderr, NULL);
fprintf(stderr, "Starting recovery on %s", ctime(&start));
ui_init();
get_args(&argc, &argv);
int previous_runs = 0;
const char *send_intent = NULL;
const char *update_package = NULL;
const char *efs_mode = NULL;
int wipe_data = 0, wipe_cache = 0;
int toggle_efs = 0;
encrypted_fs_info efs_data;
int arg;
while ((arg = getopt_long(argc, argv, "", OPTIONS, NULL)) != -1) {
switch (arg) {
case 'p': previous_runs = atoi(optarg); break;
case 's': send_intent = optarg; break;
case 'u': update_package = optarg; break;
case 'w': wipe_data = wipe_cache = 1; break;
case 'c': wipe_cache = 1; break;
case 'e': efs_mode = optarg; toggle_efs = 1; break;
case '?':
LOGE("Invalid command argument\n");
continue;
}
}
device_recovery_start();
fprintf(stderr, "Command:");
for (arg = 0; arg < argc; arg++) {
fprintf(stderr, " \"%s\"", argv[arg]);
}
fprintf(stderr, "\n\n");
property_list(print_property, NULL);
fprintf(stderr, "\n");
int status = INSTALL_SUCCESS;
if (toggle_efs) {
if (strcmp(efs_mode,"on") == 0) {
efs_data.encrypted_fs_mode = MODE_ENCRYPTEDFS_ENABLED;
ui_print("Enabling Encrypted FS.\n");
} else if (strcmp(efs_mode,"off") == 0) {
efs_data.encrypted_fs_mode = MODE_ENCRYPTEDFS_DISABLED;
ui_print("Disabling Encrypted FS.\n");
} else {
ui_print("Error: invalid Encrypted FS setting.\n");
status = INSTALL_ERROR;
}
// Recovery strategy: if the data partition is damaged, disable encrypted file systems.
// This preventsthe device recycling endlessly in recovery mode.
// TODO{oam}: implement improved recovery strategy later. egnor to review.
if (read_encrypted_fs_info(&efs_data)) {
ui_print("Encrypted FS change aborted, resetting to disabled state.\n");
efs_data.encrypted_fs_mode = MODE_ENCRYPTEDFS_DISABLED;
}
if (status != INSTALL_ERROR) {
if (erase_root("DATA:")) {
ui_print("Data wipe failed.\n");
status = INSTALL_ERROR;
} else if (erase_root("CACHE:")) {
ui_print("Cache wipe failed.\n");
status = INSTALL_ERROR;
} else if (restore_encrypted_fs_info(&efs_data)) {
ui_print("Encrypted FS change aborted.\n");
status = INSTALL_ERROR;
} else {
ui_print("Successfully updated Encrypted FS.\n");
status = INSTALL_SUCCESS;
}
}
} else if (update_package != NULL) {
status = install_package(update_package);
if (status != INSTALL_SUCCESS) ui_print("Installation aborted.\n");
} else if (wipe_data) {
if (device_wipe_data()) status = INSTALL_ERROR;
if (erase_root("DATA:")) status = INSTALL_ERROR;
if (wipe_cache && erase_root("CACHE:")) status = INSTALL_ERROR;
if (status != INSTALL_SUCCESS) ui_print("Data wipe failed.\n");
} else if (wipe_cache) {
if (wipe_cache && erase_root("CACHE:")) status = INSTALL_ERROR;
if (status != INSTALL_SUCCESS) ui_print("Cache wipe failed.\n");
} else {
status = INSTALL_ERROR; // No command specified
}
if (status != INSTALL_SUCCESS) ui_set_background(BACKGROUND_ICON_ERROR);
if (status != INSTALL_SUCCESS || ui_text_visible()) prompt_and_wait();
// If there is a radio image pending, reboot now to install it.
maybe_install_firmware_update(send_intent, TEMPORARY_LOG_FILE);
// Otherwise, get ready to boot the main system...
finish_recovery(send_intent);
ui_print("Rebooting...\n");
sync();
reboot(RB_AUTOBOOT);
return EXIT_SUCCESS;
}
