261 lines
9.2 KiB
C++
261 lines
9.2 KiB
C++
/*
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* Copyright (C) 2007 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 <stdlib.h>
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#include <string>
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#include <vector>
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#ifdef AB_OTA_UPDATER
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#include <map>
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#include <android-base/parseint.h>
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#include <android-base/stringprintf.h>
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#include <android-base/strings.h>
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#endif
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#include <cutils/properties.h>
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#include "common.h"
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#include "installcommand.h"
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#include "minzip/SysUtil.h"
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#include "minzip/Zip.h"
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#ifdef USE_OLD_VERIFIER
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#include "verifier24/verifier.h"
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#else
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#include "verifier.h"
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#endif
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#ifdef AB_OTA_UPDATER
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static constexpr const char* AB_OTA_PAYLOAD_PROPERTIES = "payload_properties.txt";
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static constexpr const char* AB_OTA_PAYLOAD = "payload.bin";
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static constexpr const char* METADATA_PATH = "META-INF/com/android/metadata";
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// This function parses and returns the build.version.incremental
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static int parse_build_number(std::string str) {
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size_t pos = str.find("=");
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if (pos != std::string::npos) {
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std::string num_string = android::base::Trim(str.substr(pos+1));
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int build_number;
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if (android::base::ParseInt(num_string.c_str(), &build_number, 0)) {
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return build_number;
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}
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}
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printf("Failed to parse build number in %s.\n", str.c_str());
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return -1;
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}
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bool read_metadata_from_package(ZipArchive* zip, std::string* meta_data) {
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const ZipEntry* meta_entry = mzFindZipEntry(zip, METADATA_PATH);
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if (meta_entry == nullptr) {
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printf("Failed to find %s in update package.\n", METADATA_PATH);
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return false;
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}
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meta_data->resize(meta_entry->uncompLen, '\0');
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if (!mzReadZipEntry(zip, meta_entry, &(*meta_data)[0], meta_entry->uncompLen)) {
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printf("Failed to read metadata in update package.\n");
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return false;
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}
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return true;
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}
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// Read the build.version.incremental of src/tgt from the metadata and log it to last_install.
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static void read_source_target_build(ZipArchive* zip, std::vector<std::string>& log_buffer) {
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std::string meta_data;
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if (!read_metadata_from_package(zip, &meta_data)) {
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return;
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}
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// Examples of the pre-build and post-build strings in metadata:
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// pre-build-incremental=2943039
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// post-build-incremental=2951741
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std::vector<std::string> lines = android::base::Split(meta_data, "\n");
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for (const std::string& line : lines) {
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std::string str = android::base::Trim(line);
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if (android::base::StartsWith(str, "pre-build-incremental")){
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int source_build = parse_build_number(str);
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if (source_build != -1) {
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log_buffer.push_back(android::base::StringPrintf("source_build: %d",
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source_build));
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}
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} else if (android::base::StartsWith(str, "post-build-incremental")) {
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int target_build = parse_build_number(str);
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if (target_build != -1) {
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log_buffer.push_back(android::base::StringPrintf("target_build: %d",
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target_build));
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}
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}
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}
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}
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// Parses the metadata of the OTA package in |zip| and checks whether we are
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// allowed to accept this A/B package. Downgrading is not allowed unless
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// explicitly enabled in the package and only for incremental packages.
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static int check_newer_ab_build(ZipArchive* zip)
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{
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std::string metadata_str;
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if (!read_metadata_from_package(zip, &metadata_str)) {
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return INSTALL_CORRUPT;
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}
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std::map<std::string, std::string> metadata;
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for (const std::string& line : android::base::Split(metadata_str, "\n")) {
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size_t eq = line.find('=');
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if (eq != std::string::npos) {
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metadata[line.substr(0, eq)] = line.substr(eq + 1);
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}
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}
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char value[PROPERTY_VALUE_MAX];
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property_get("ro.product.device", value, "");
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const std::string& pkg_device = metadata["pre-device"];
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if (pkg_device != value || pkg_device.empty()) {
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printf("Package is for product %s but expected %s\n",
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pkg_device.c_str(), value);
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return INSTALL_ERROR;
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}
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// We allow the package to not have any serialno, but if it has a non-empty
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// value it should match.
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property_get("ro.serialno", value, "");
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const std::string& pkg_serial_no = metadata["serialno"];
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if (!pkg_serial_no.empty() && pkg_serial_no != value) {
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printf("Package is for serial %s\n", pkg_serial_no.c_str());
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return INSTALL_ERROR;
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}
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if (metadata["ota-type"] != "AB") {
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printf("Package is not A/B\n");
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return INSTALL_ERROR;
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}
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// Incremental updates should match the current build.
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property_get("ro.build.version.incremental", value, "");
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const std::string& pkg_pre_build = metadata["pre-build-incremental"];
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if (!pkg_pre_build.empty() && pkg_pre_build != value) {
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printf("Package is for source build %s but expected %s\n",
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pkg_pre_build.c_str(), value);
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return INSTALL_ERROR;
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}
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property_get("ro.build.fingerprint", value, "");
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const std::string& pkg_pre_build_fingerprint = metadata["pre-build"];
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if (!pkg_pre_build_fingerprint.empty() &&
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pkg_pre_build_fingerprint != value) {
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printf("Package is for source build %s but expected %s\n",
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pkg_pre_build_fingerprint.c_str(), value);
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return INSTALL_ERROR;
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}
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// Check for downgrade version.
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int64_t build_timestampt = property_get_int64(
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"ro.build.date.utc", std::numeric_limits<int64_t>::max());
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int64_t pkg_post_timespampt = 0;
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// We allow to full update to the same version we are running, in case there
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// is a problem with the current copy of that version.
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if (metadata["post-timestamp"].empty() ||
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!android::base::ParseInt(metadata["post-timestamp"].c_str(),
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&pkg_post_timespampt) ||
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pkg_post_timespampt < build_timestampt) {
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if (metadata["ota-downgrade"] != "yes") {
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printf("Update package is older than the current build, expected a "
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"build newer than timestamp %" PRIu64 " but package has "
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"timestamp %" PRIu64 " and downgrade not allowed.\n",
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build_timestampt, pkg_post_timespampt);
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return INSTALL_ERROR;
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}
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if (pkg_pre_build_fingerprint.empty()) {
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printf("Downgrade package must have a pre-build version set, not "
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"allowed.\n");
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return INSTALL_ERROR;
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}
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}
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return 0;
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}
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int
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abupdate_binary_command(const char* path, ZipArchive* zip, int retry_count,
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int status_fd, std::vector<std::string>* cmd)
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{
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int ret = check_newer_ab_build(zip);
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if (ret) {
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return ret;
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}
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// For A/B updates we extract the payload properties to a buffer and obtain
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// the RAW payload offset in the zip file.
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const ZipEntry* properties_entry =
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mzFindZipEntry(zip, AB_OTA_PAYLOAD_PROPERTIES);
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if (!properties_entry) {
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printf("Can't find %s\n", AB_OTA_PAYLOAD_PROPERTIES);
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return INSTALL_CORRUPT;
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}
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std::vector<unsigned char> payload_properties(
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mzGetZipEntryUncompLen(properties_entry));
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if (!mzExtractZipEntryToBuffer(zip, properties_entry,
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payload_properties.data())) {
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printf("Can't extract %s\n", AB_OTA_PAYLOAD_PROPERTIES);
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return INSTALL_CORRUPT;
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}
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const ZipEntry* payload_entry = mzFindZipEntry(zip, AB_OTA_PAYLOAD);
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if (!payload_entry) {
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printf("Can't find %s\n", AB_OTA_PAYLOAD);
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return INSTALL_CORRUPT;
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}
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long payload_offset = mzGetZipEntryOffset(payload_entry);
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*cmd = {
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"/sbin/update_engine_sideload",
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android::base::StringPrintf("--payload=file://%s", path),
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android::base::StringPrintf("--offset=%ld", payload_offset),
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"--headers=" + std::string(payload_properties.begin(),
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payload_properties.end()),
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android::base::StringPrintf("--status_fd=%d", status_fd),
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};
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return INSTALL_SUCCESS;
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}
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#else
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int
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abupdate_binary_command(const char* path, ZipArchive* zip, int retry_count,
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int status_fd, std::vector<std::string>* cmd)
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{
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printf("No support for AB OTA zips included\n");
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return INSTALL_CORRUPT;
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}
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#endif
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int
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update_binary_command(const char* path, ZipArchive* zip, int retry_count,
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int status_fd, std::vector<std::string>* cmd)
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{
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char charfd[16];
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sprintf(charfd, "%i", status_fd);
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cmd->push_back(TMP_UPDATER_BINARY_PATH);
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cmd->push_back(EXPAND(RECOVERY_API_VERSION));
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cmd->push_back(charfd);
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cmd->push_back(path);
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/**cmd = {
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TMP_UPDATER_BINARY_PATH,
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EXPAND(RECOVERY_API_VERSION), // defined in Android.mk
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charfd,
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path,
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};*/
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if (retry_count > 0)
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cmd->push_back("retry");
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return 0;
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}
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