/*
* 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 <stdlib.h>
#include <string>
#include <vector>
#ifdef AB_OTA_UPDATER
#include <map>
#include <android-base/parseint.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#endif
#include <cutils/properties.h>
#include "common.h"
#include "installcommand.h"
#include "minzip/SysUtil.h"
#include "minzip/Zip.h"
#ifdef USE_OLD_VERIFIER
#include "verifier24/verifier.h"
#else
#include "verifier.h"
#endif
#ifdef AB_OTA_UPDATER
static constexpr const char* AB_OTA_PAYLOAD_PROPERTIES = "payload_properties.txt";
static constexpr const char* AB_OTA_PAYLOAD = "payload.bin";
static constexpr const char* METADATA_PATH = "META-INF/com/android/metadata";
// This function parses and returns the build.version.incremental
static int parse_build_number(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;
}
}
printf("Failed to parse build number in %s.\n", str.c_str());
return -1;
}
bool read_metadata_from_package(ZipArchive* zip, std::string* meta_data) {
const ZipEntry* meta_entry = mzFindZipEntry(zip, METADATA_PATH);
if (meta_entry == nullptr) {
printf("Failed to find %s in update package.\n", METADATA_PATH);
return false;
}
meta_data->resize(meta_entry->uncompLen, '\0');
if (!mzReadZipEntry(zip, meta_entry, &(*meta_data)[0], meta_entry->uncompLen)) {
printf("Failed to read metadata in update package.\n");
return false;
}
return true;
}
// 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) {
std::string meta_data;
if (!read_metadata_from_package(zip, &meta_data)) {
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));
}
}
}
}
// Parses the metadata of the OTA package in |zip| and checks whether we are
// allowed to accept this A/B package. Downgrading is not allowed unless
// explicitly enabled in the package and only for incremental packages.
static int check_newer_ab_build(ZipArchive* zip)
{
std::string metadata_str;
if (!read_metadata_from_package(zip, &metadata_str)) {
return INSTALL_CORRUPT;
}
std::map<std::string, std::string> metadata;
for (const std::string& line : android::base::Split(metadata_str, "\n")) {
size_t eq = line.find('=');
if (eq != std::string::npos) {
metadata[line.substr(0, eq)] = line.substr(eq + 1);
}
}
char value[PROPERTY_VALUE_MAX];
property_get("ro.product.device", value, "");
const std::string& pkg_device = metadata["pre-device"];
if (pkg_device != value || pkg_device.empty()) {
printf("Package is for product %s but expected %s\n",
pkg_device.c_str(), value);
return INSTALL_ERROR;
}
// We allow the package to not have any serialno, but if it has a non-empty
// value it should match.
property_get("ro.serialno", value, "");
const std::string& pkg_serial_no = metadata["serialno"];
if (!pkg_serial_no.empty() && pkg_serial_no != value) {
printf("Package is for serial %s\n", pkg_serial_no.c_str());
return INSTALL_ERROR;
}
if (metadata["ota-type"] != "AB") {
printf("Package is not A/B\n");
return INSTALL_ERROR;
}
// Incremental updates should match the current build.
property_get("ro.build.version.incremental", value, "");
const std::string& pkg_pre_build = metadata["pre-build-incremental"];
if (!pkg_pre_build.empty() && pkg_pre_build != value) {
printf("Package is for source build %s but expected %s\n",
pkg_pre_build.c_str(), value);
return INSTALL_ERROR;
}
property_get("ro.build.fingerprint", value, "");
const std::string& pkg_pre_build_fingerprint = metadata["pre-build"];
if (!pkg_pre_build_fingerprint.empty() &&
pkg_pre_build_fingerprint != value) {
printf("Package is for source build %s but expected %s\n",
pkg_pre_build_fingerprint.c_str(), value);
return INSTALL_ERROR;
}
// Check for downgrade version.
int64_t build_timestampt = property_get_int64(
"ro.build.date.utc", std::numeric_limits<int64_t>::max());
int64_t pkg_post_timespampt = 0;
// We allow to full update to the same version we are running, in case there
// is a problem with the current copy of that version.
if (metadata["post-timestamp"].empty() ||
!android::base::ParseInt(metadata["post-timestamp"].c_str(),
&pkg_post_timespampt) ||
pkg_post_timespampt < build_timestampt) {
if (metadata["ota-downgrade"] != "yes") {
printf("Update package is older than the current build, expected a "
"build newer than timestamp %" PRIu64 " but package has "
"timestamp %" PRIu64 " and downgrade not allowed.\n",
build_timestampt, pkg_post_timespampt);
return INSTALL_ERROR;
}
if (pkg_pre_build_fingerprint.empty()) {
printf("Downgrade package must have a pre-build version set, not "
"allowed.\n");
return INSTALL_ERROR;
}
}
return 0;
}
int
abupdate_binary_command(const char* path, ZipArchive* zip, int retry_count,
int status_fd, std::vector<std::string>* cmd)
{
int ret = check_newer_ab_build(zip);
if (ret) {
return ret;
}
// For A/B updates we extract the payload properties to a buffer and obtain
// the RAW payload offset in the zip file.
const ZipEntry* properties_entry =
mzFindZipEntry(zip, AB_OTA_PAYLOAD_PROPERTIES);
if (!properties_entry) {
printf("Can't find %s\n", AB_OTA_PAYLOAD_PROPERTIES);
return INSTALL_CORRUPT;
}
std::vector<unsigned char> payload_properties(
mzGetZipEntryUncompLen(properties_entry));
if (!mzExtractZipEntryToBuffer(zip, properties_entry,
payload_properties.data())) {
printf("Can't extract %s\n", AB_OTA_PAYLOAD_PROPERTIES);
return INSTALL_CORRUPT;
}
const ZipEntry* payload_entry = mzFindZipEntry(zip, AB_OTA_PAYLOAD);
if (!payload_entry) {
printf("Can't find %s\n", AB_OTA_PAYLOAD);
return INSTALL_CORRUPT;
}
long payload_offset = mzGetZipEntryOffset(payload_entry);
*cmd = {
"/sbin/update_engine_sideload",
android::base::StringPrintf("--payload=file://%s", path),
android::base::StringPrintf("--offset=%ld", payload_offset),
"--headers=" + std::string(payload_properties.begin(),
payload_properties.end()),
android::base::StringPrintf("--status_fd=%d", status_fd),
};
return INSTALL_SUCCESS;
}
#else
int
abupdate_binary_command(const char* path, ZipArchive* zip, int retry_count,
int status_fd, std::vector<std::string>* cmd)
{
printf("No support for AB OTA zips included\n");
return INSTALL_CORRUPT;
}
#endif
int
update_binary_command(const char* path, ZipArchive* zip, int retry_count,
int status_fd, std::vector<std::string>* cmd)
{
char charfd[16];
sprintf(charfd, "%i", status_fd);
cmd->push_back(TMP_UPDATER_BINARY_PATH);
cmd->push_back(EXPAND(RECOVERY_API_VERSION));
cmd->push_back(charfd);
cmd->push_back(path);
/**cmd = {
TMP_UPDATER_BINARY_PATH,
EXPAND(RECOVERY_API_VERSION), // defined in Android.mk
charfd,
path,
};*/
if (retry_count > 0)
cmd->push_back("retry");
return 0;
}
