/*
* Copyright (C) 2019 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 "otautil/package.h"
#include <string.h>
#include <unistd.h>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/stringprintf.h>
#include <android-base/unique_fd.h>
#include "otautil/error_code.h"
#include "otautil/sysutil.h"
// This class wraps the package in memory, i.e. a memory mapped package, or a package loaded
// to a string/vector.
class MemoryPackage : public Package {
public:
// Constructs the class from a file. We will memory maps the file later.
MemoryPackage(const std::string& path, std::unique_ptr<MemMapping> map,
const std::function<void(float)>& set_progress);
// Constructs the class from the package bytes in |content|.
MemoryPackage(std::vector<uint8_t> content, const std::function<void(float)>& set_progress);
~MemoryPackage() override;
PackageType GetType() const override {
return PackageType::kMemory;
}
// Memory maps the package file if necessary. Initializes the start address and size of the
// package.
uint64_t GetPackageSize() const override {
return package_size_;
}
std::string GetPath() const override {
return path_;
}
bool ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) override;
ZipArchiveHandle GetZipArchiveHandle() override;
bool UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers, uint64_t start,
uint64_t length) override;
private:
const uint8_t* addr_; // Start address of the package in memory.
uint64_t package_size_; // Package size in bytes.
// The memory mapped package.
std::unique_ptr<MemMapping> map_;
// A copy of the package content, valid only if we create the class with the exact bytes of
// the package.
std::vector<uint8_t> package_content_;
// The physical path to the package, empty if we create the class with the package content.
std::string path_;
// The ZipArchiveHandle of the package.
ZipArchiveHandle zip_handle_;
};
void Package::SetProgress(float progress) {
if (set_progress_) {
set_progress_(progress);
}
}
class FilePackage : public Package {
public:
FilePackage(android::base::unique_fd&& fd, uint64_t file_size, const std::string& path,
const std::function<void(float)>& set_progress);
~FilePackage() override;
PackageType GetType() const override {
return PackageType::kFile;
}
uint64_t GetPackageSize() const override {
return package_size_;
}
std::string GetPath() const override {
return path_;
}
bool ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) override;
ZipArchiveHandle GetZipArchiveHandle() override;
bool UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers, uint64_t start,
uint64_t length) override;
private:
android::base::unique_fd fd_; // The underlying fd to the open package.
uint64_t package_size_;
std::string path_; // The physical path to the package.
ZipArchiveHandle zip_handle_;
};
std::unique_ptr<Package> Package::CreateMemoryPackage(
const std::string& path, const std::function<void(float)>& set_progress) {
std::unique_ptr<MemMapping> mmap = std::make_unique<MemMapping>();
if (!mmap->MapFile(path)) {
LOG(ERROR) << "failed to map file";
return nullptr;
}
return std::make_unique<MemoryPackage>(path, std::move(mmap), set_progress);
}
std::unique_ptr<Package> Package::CreateFilePackage(
const std::string& path, const std::function<void(float)>& set_progress) {
android::base::unique_fd fd(open(path.c_str(), O_RDONLY));
if (fd == -1) {
PLOG(ERROR) << "Failed to open " << path;
return nullptr;
}
off64_t file_size = lseek64(fd.get(), 0, SEEK_END);
if (file_size == -1) {
PLOG(ERROR) << "Failed to get the package size";
return nullptr;
}
return std::make_unique<FilePackage>(std::move(fd), file_size, path, set_progress);
}
std::unique_ptr<Package> Package::CreateMemoryPackage(
std::vector<uint8_t> content, const std::function<void(float)>& set_progress) {
return std::make_unique<MemoryPackage>(std::move(content), set_progress);
}
MemoryPackage::MemoryPackage(const std::string& path, std::unique_ptr<MemMapping> map,
const std::function<void(float)>& set_progress)
: map_(std::move(map)), path_(path), zip_handle_(nullptr) {
addr_ = map_->addr;
package_size_ = map_->length;
set_progress_ = set_progress;
}
MemoryPackage::MemoryPackage(std::vector<uint8_t> content,
const std::function<void(float)>& set_progress)
: package_content_(std::move(content)), zip_handle_(nullptr) {
CHECK(!package_content_.empty());
addr_ = package_content_.data();
package_size_ = package_content_.size();
set_progress_ = set_progress;
}
MemoryPackage::~MemoryPackage() {
if (zip_handle_) {
CloseArchive(zip_handle_);
}
}
bool MemoryPackage::ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) {
if (byte_count > package_size_ || offset > package_size_ - byte_count) {
LOG(ERROR) << "Out of bound read, offset: " << offset << ", size: " << byte_count
<< ", total package_size: " << package_size_;
return false;
}
memcpy(buffer, addr_ + offset, byte_count);
return true;
}
bool MemoryPackage::UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers,
uint64_t start, uint64_t length) {
if (length > package_size_ || start > package_size_ - length) {
LOG(ERROR) << "Out of bound read, offset: " << start << ", size: " << length
<< ", total package_size: " << package_size_;
return false;
}
for (const auto& hasher : hashers) {
hasher(addr_ + start, length);
}
return true;
}
ZipArchiveHandle MemoryPackage::GetZipArchiveHandle() {
if (zip_handle_) {
return zip_handle_;
}
if (auto err = OpenArchiveFromMemory(const_cast<uint8_t*>(addr_), package_size_, path_.c_str(),
&zip_handle_);
err != 0) {
LOG(ERROR) << "Can't open package" << path_ << " : " << ErrorCodeString(err);
return nullptr;
}
return zip_handle_;
}
FilePackage::FilePackage(android::base::unique_fd&& fd, uint64_t file_size, const std::string& path,
const std::function<void(float)>& set_progress)
: fd_(std::move(fd)), package_size_(file_size), path_(path), zip_handle_(nullptr) {
set_progress_ = set_progress;
}
FilePackage::~FilePackage() {
if (zip_handle_) {
CloseArchive(zip_handle_);
}
}
bool FilePackage::ReadFullyAtOffset(uint8_t* buffer, uint64_t byte_count, uint64_t offset) {
if (byte_count > package_size_ || offset > package_size_ - byte_count) {
LOG(ERROR) << "Out of bound read, offset: " << offset << ", size: " << byte_count
<< ", total package_size: " << package_size_;
return false;
}
if (!android::base::ReadFullyAtOffset(fd_.get(), buffer, byte_count, offset)) {
PLOG(ERROR) << "Failed to read " << byte_count << " bytes data at offset " << offset;
return false;
}
return true;
}
bool FilePackage::UpdateHashAtOffset(const std::vector<HasherUpdateCallback>& hashers,
uint64_t start, uint64_t length) {
if (length > package_size_ || start > package_size_ - length) {
LOG(ERROR) << "Out of bound read, offset: " << start << ", size: " << length
<< ", total package_size: " << package_size_;
return false;
}
uint64_t so_far = 0;
while (so_far < length) {
uint64_t read_size = std::min<uint64_t>(length - so_far, 16 * MiB);
std::vector<uint8_t> buffer(read_size);
if (!ReadFullyAtOffset(buffer.data(), read_size, start + so_far)) {
return false;
}
for (const auto& hasher : hashers) {
hasher(buffer.data(), read_size);
}
so_far += read_size;
}
return true;
}
ZipArchiveHandle FilePackage::GetZipArchiveHandle() {
if (zip_handle_) {
return zip_handle_;
}
if (auto err = OpenArchiveFd(fd_.get(), path_.c_str(), &zip_handle_, false); err != 0) {
LOG(ERROR) << "Can't open package" << path_ << " : " << ErrorCodeString(err);
return nullptr;
}
return zip_handle_;
}
