/*
* 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 <limits.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <chrono>
#include <string>
#include <vector>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/parseint.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include "common.h"
#include "error_code.h"
#include "install.h"
#include "minui/minui.h"
#include "minzip/SysUtil.h"
#include "minzip/Zip.h"
#include "roots.h"
#include "ui.h"
#include "verifier.h"
extern RecoveryUI* ui;
#define ASSUMED_UPDATE_BINARY_NAME "META-INF/com/google/android/update-binary"
#define PUBLIC_KEYS_FILE "/res/keys"
static constexpr const char* METADATA_PATH = "META-INF/com/android/metadata";
static constexpr const char* UNCRYPT_STATUS = "/cache/recovery/uncrypt_status";
// Default allocation of progress bar segments to operations
static const int VERIFICATION_PROGRESS_TIME = 60;
static const float VERIFICATION_PROGRESS_FRACTION = 0.25;
static const float DEFAULT_FILES_PROGRESS_FRACTION = 0.4;
static const float DEFAULT_IMAGE_PROGRESS_FRACTION = 0.1;
// This function parses and returns the build.version.incremental
static int parse_build_number(const std::string& str) {
size_t pos = str.find('=');
if (pos != std::string::npos) {
std::string num_string = android::base::Trim(str.substr(pos+1));
int build_number;
if (android::base::ParseInt(num_string.c_str(), &build_number, 0)) {
return build_number;
}
}
LOG(ERROR) << "Failed to parse build number in " << str;
return -1;
}
// Read the build.version.incremental of src/tgt from the metadata and log it to last_install.
static void read_source_target_build(ZipArchive* zip, std::vector<std::string>& log_buffer) {
const ZipEntry* meta_entry = mzFindZipEntry(zip, METADATA_PATH);
if (meta_entry == nullptr) {
LOG(ERROR) << "Failed to find " << METADATA_PATH << " in update package";
return;
}
std::string meta_data(meta_entry->uncompLen, '\0');
if (!mzReadZipEntry(zip, meta_entry, &meta_data[0], meta_entry->uncompLen)) {
LOG(ERROR) << "Failed to read metadata in update package";
return;
}
// Examples of the pre-build and post-build strings in metadata:
// pre-build-incremental=2943039
// post-build-incremental=2951741
std::vector<std::string> lines = android::base::Split(meta_data, "\n");
for (const std::string& line : lines) {
std::string str = android::base::Trim(line);
if (android::base::StartsWith(str, "pre-build-incremental")){
int source_build = parse_build_number(str);
if (source_build != -1) {
log_buffer.push_back(android::base::StringPrintf("source_build: %d",
source_build));
}
} else if (android::base::StartsWith(str, "post-build-incremental")) {
int target_build = parse_build_number(str);
if (target_build != -1) {
log_buffer.push_back(android::base::StringPrintf("target_build: %d",
target_build));
}
}
}
}
// If the package contains an update binary, extract it and run it.
static int
try_update_binary(const char* path, ZipArchive* zip, bool* wipe_cache,
std::vector<std::string>& log_buffer, int retry_count)
{
read_source_target_build(zip, log_buffer);
const ZipEntry* binary_entry =
mzFindZipEntry(zip, ASSUMED_UPDATE_BINARY_NAME);
if (binary_entry == NULL) {
mzCloseZipArchive(zip);
return INSTALL_CORRUPT;
}
const char* binary = "/tmp/update_binary";
unlink(binary);
int fd = creat(binary, 0755);
if (fd < 0) {
PLOG(ERROR) << "Can't make " << binary;
mzCloseZipArchive(zip);
return INSTALL_ERROR;
}
bool ok = mzExtractZipEntryToFile(zip, binary_entry, fd);
close(fd);
mzCloseZipArchive(zip);
if (!ok) {
LOG(ERROR) << "Can't copy " << ASSUMED_UPDATE_BINARY_NAME;
return INSTALL_ERROR;
}
int pipefd[2];
pipe(pipefd);
// When executing the update binary contained in the package, the
// arguments passed are:
//
// - the version number for this interface
//
// - an fd to which the program can write in order to update the
// progress bar. The program can write single-line commands:
//
// progress <frac> <secs>
// fill up the next <frac> part of of the progress bar
// over <secs> seconds. If <secs> is zero, use
// set_progress commands to manually control the
// progress of this segment of the bar.
//
// set_progress <frac>
// <frac> should be between 0.0 and 1.0; sets the
// progress bar within the segment defined by the most
// recent progress command.
//
// firmware <"hboot"|"radio"> <filename>
// arrange to install the contents of <filename> in the
// given partition on reboot.
//
// (API v2: <filename> may start with "PACKAGE:" to
// indicate taking a file from the OTA package.)
//
// (API v3: this command no longer exists.)
//
// ui_print <string>
// display <string> on the screen.
//
// wipe_cache
// a wipe of cache will be performed following a successful
// installation.
//
// clear_display
// turn off the text display.
//
// enable_reboot
// packages can explicitly request that they want the user
// to be able to reboot during installation (useful for
// debugging packages that don't exit).
//
// - the name of the package zip file.
//
// - an optional argument "retry" if this update is a retry of a failed
// update attempt.
//
const char* args[6];
args[0] = binary;
args[1] = EXPAND(RECOVERY_API_VERSION); // defined in Android.mk
char temp[16];
snprintf(temp, sizeof(temp), "%d", pipefd[1]);
args[2] = temp;
args[3] = path;
args[4] = retry_count > 0 ? "retry" : NULL;
args[5] = NULL;
pid_t pid = fork();
if (pid == 0) {
umask(022);
close(pipefd[0]);
execv(binary, const_cast<char**>(args));
fprintf(stdout, "E:Can't run %s (%s)\n", binary, strerror(errno));
_exit(-1);
}
close(pipefd[1]);
*wipe_cache = false;
bool retry_update = false;
char buffer[1024];
FILE* from_child = fdopen(pipefd[0], "r");
while (fgets(buffer, sizeof(buffer), from_child) != NULL) {
char* command = strtok(buffer, " \n");
if (command == NULL) {
continue;
} else if (strcmp(command, "progress") == 0) {
char* fraction_s = strtok(NULL, " \n");
char* seconds_s = strtok(NULL, " \n");
float fraction = strtof(fraction_s, NULL);
int seconds = strtol(seconds_s, NULL, 10);
ui->ShowProgress(fraction * (1-VERIFICATION_PROGRESS_FRACTION), seconds);
} else if (strcmp(command, "set_progress") == 0) {
char* fraction_s = strtok(NULL, " \n");
float fraction = strtof(fraction_s, NULL);
ui->SetProgress(fraction);
} else if (strcmp(command, "ui_print") == 0) {
char* str = strtok(NULL, "\n");
if (str) {
ui->PrintOnScreenOnly("%s", str);
} else {
ui->PrintOnScreenOnly("\n");
}
fflush(stdout);
} else if (strcmp(command, "wipe_cache") == 0) {
*wipe_cache = true;
} else if (strcmp(command, "clear_display") == 0) {
ui->SetBackground(RecoveryUI::NONE);
} else if (strcmp(command, "enable_reboot") == 0) {
// packages can explicitly request that they want the user
// to be able to reboot during installation (useful for
// debugging packages that don't exit).
ui->SetEnableReboot(true);
} else if (strcmp(command, "retry_update") == 0) {
retry_update = true;
} else if (strcmp(command, "log") == 0) {
// Save the logging request from updater and write to
// last_install later.
log_buffer.push_back(std::string(strtok(NULL, "\n")));
} else {
LOG(ERROR) << "unknown command [" << command << "]";
}
}
fclose(from_child);
int status;
waitpid(pid, &status, 0);
if (retry_update) {
return INSTALL_RETRY;
}
if (!WIFEXITED(status) || WEXITSTATUS(status) != 0) {
LOG(ERROR) << "Error in " << path << " (Status " << WEXITSTATUS(status) << ")";
return INSTALL_ERROR;
}
return INSTALL_SUCCESS;
}
static int
really_install_package(const char *path, bool* wipe_cache, bool needs_mount,
std::vector<std::string>& log_buffer, int retry_count)
{
ui->SetBackground(RecoveryUI::INSTALLING_UPDATE);
ui->Print("Finding update package...\n");
// Give verification half the progress bar...
ui->SetProgressType(RecoveryUI::DETERMINATE);
ui->ShowProgress(VERIFICATION_PROGRESS_FRACTION, VERIFICATION_PROGRESS_TIME);
LOG(INFO) << "Update location: " << path;
// Map the update package into memory.
ui->Print("Opening update package...\n");
if (path && needs_mount) {
if (path[0] == '@') {
ensure_path_mounted(path+1);
} else {
ensure_path_mounted(path);
}
}
MemMapping map;
if (sysMapFile(path, &map) != 0) {
LOG(ERROR) << "failed to map file";
return INSTALL_CORRUPT;
}
// Load keys.
std::vector<Certificate> loadedKeys;
if (!load_keys(PUBLIC_KEYS_FILE, loadedKeys)) {
LOG(ERROR) << "Failed to load keys";
sysReleaseMap(&map);
return INSTALL_CORRUPT;
}
LOG(INFO) << loadedKeys.size() << " key(s) loaded from " << PUBLIC_KEYS_FILE;
// Verify package.
ui->Print("Verifying update package...\n");
auto t0 = std::chrono::system_clock::now();
int err = verify_file(map.addr, map.length, loadedKeys);
std::chrono::duration<double> duration = std::chrono::system_clock::now() - t0;
ui->Print("Update package verification took %.1f s (result %d).\n", duration.count(), err);
if (err != VERIFY_SUCCESS) {
LOG(ERROR) << "signature verification failed";
log_buffer.push_back(android::base::StringPrintf("error: %d", kZipVerificationFailure));
sysReleaseMap(&map);
return INSTALL_CORRUPT;
}
// Try to open the package.
ZipArchive zip;
err = mzOpenZipArchive(map.addr, map.length, &zip);
if (err != 0) {
LOG(ERROR) << "Can't open " << path;
log_buffer.push_back(android::base::StringPrintf("error: %d", kZipOpenFailure));
sysReleaseMap(&map);
return INSTALL_CORRUPT;
}
// Verify and install the contents of the package.
ui->Print("Installing update...\n");
if (retry_count > 0) {
ui->Print("Retry attempt: %d\n", retry_count);
}
ui->SetEnableReboot(false);
int result = try_update_binary(path, &zip, wipe_cache, log_buffer, retry_count);
ui->SetEnableReboot(true);
ui->Print("\n");
sysReleaseMap(&map);
return result;
}
int
install_package(const char* path, bool* wipe_cache, const char* install_file,
bool needs_mount, int retry_count)
{
modified_flash = true;
auto start = std::chrono::system_clock::now();
int result;
std::vector<std::string> log_buffer;
if (setup_install_mounts() != 0) {
LOG(ERROR) << "failed to set up expected mounts for install; aborting";
result = INSTALL_ERROR;
} else {
result = really_install_package(path, wipe_cache, needs_mount, log_buffer, retry_count);
}
// Measure the time spent to apply OTA update in seconds.
std::chrono::duration<double> duration = std::chrono::system_clock::now() - start;
int time_total = static_cast<int>(duration.count());
if (ensure_path_mounted(UNCRYPT_STATUS) != 0) {
LOG(WARNING) << "Can't mount " << UNCRYPT_STATUS;
} else {
std::string uncrypt_status;
if (!android::base::ReadFileToString(UNCRYPT_STATUS, &uncrypt_status)) {
PLOG(WARNING) << "failed to read uncrypt status";
} else if (!android::base::StartsWith(uncrypt_status, "uncrypt_:")) {
PLOG(WARNING) << "corrupted uncrypt_status: " << uncrypt_status;
} else {
log_buffer.push_back(android::base::Trim(uncrypt_status));
}
}
// The first two lines need to be the package name and install result.
std::vector<std::string> log_header = {
path,
result == INSTALL_SUCCESS ? "1" : "0",
"time_total: " + std::to_string(time_total),
"retry: " + std::to_string(retry_count),
};
std::string log_content = android::base::Join(log_header, "\n") + "\n" +
android::base::Join(log_buffer, "\n");
if (!android::base::WriteStringToFile(log_content, install_file)) {
PLOG(ERROR) << "failed to write " << install_file;
}
// Write a copy into last_log.
LOG(INFO) << log_content;
return result;
}
