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/*
* Copyright (C) 2018 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 "host/commands/assemble_cvd/boot_image_unpacker.h"
#include <string.h>
#include <unistd.h>
#include <sstream>
#include <bootimg.h>
#include <glog/logging.h>
#include "common/libs/utils/subprocess.h"
namespace cvd {
namespace {
// Extracts size bytes from file, starting at offset bytes from the beginning to
// path.
bool ExtractFile(SharedFD source, off_t offset, size_t size,
const std::string& path) {
auto dest = SharedFD::Open(path.c_str(), O_CREAT | O_RDWR, 0755);
if (!dest->IsOpen()) {
LOG(ERROR) << "Unable to open " << path;
return false;
}
auto off = source->LSeek(offset, SEEK_SET);
if (off != offset) {
LOG(ERROR) << "Failed to lseek: " << source->StrError();
return false;
}
return dest->CopyFrom(*source, size);
}
} // namespace
std::unique_ptr<BootImageUnpacker> BootImageUnpacker::FromImages(
const std::string& boot_image_path,
const std::string& vendor_boot_image_path) {
auto boot_img = SharedFD::Open(boot_image_path.c_str(), O_RDONLY);
if (!boot_img->IsOpen()) {
LOG(ERROR) << "Unable to open boot image (" << boot_image_path
<< "): " << boot_img->StrError();
return nullptr;
}
boot_img_hdr_v3 header;
auto bytes_read = boot_img->Read(&header, sizeof(header));
if (bytes_read != sizeof(header)) {
LOG(ERROR) << "Error reading boot image header";
return nullptr;
}
auto vendor_boot_img = SharedFD::Open(vendor_boot_image_path.c_str(),
O_RDONLY);
if (!vendor_boot_img->IsOpen()) {
LOG(ERROR) << "Unable to open vendor boot image (" << vendor_boot_image_path
<< "): " << vendor_boot_img->StrError();
return nullptr;
}
vendor_boot_img_hdr_v3 vboot_header;
bytes_read = vendor_boot_img->Read(&vboot_header, sizeof(vboot_header));
if (bytes_read != sizeof(vboot_header)) {
LOG(ERROR) << "Error reading vendor boot image header";
return nullptr;
}
std::ostringstream cmdline;
cmdline << reinterpret_cast<char*>(&header.cmdline[0]);
if (vboot_header.cmdline[0] != '\0') {
cmdline << " ";
cmdline << reinterpret_cast<char*>(&vboot_header.cmdline[0]);
}
uint32_t page_size = 4096;
// See system/tools/mkbootimg/include/bootimg/bootimg.h for the origin of
// these offset calculations
uint32_t kernel_offset = page_size;
uint32_t ramdisk_offset =
kernel_offset +
((header.kernel_size + page_size - 1) / page_size) * page_size;
uint32_t vendor_ramdisk_offset =
((vboot_header.header_size + vboot_header.page_size - 1) / vboot_header.page_size) *
vboot_header.page_size;
std::unique_ptr<BootImageUnpacker> ret(new BootImageUnpacker(
boot_img, cmdline.str(), header.kernel_size, kernel_offset,
header.ramdisk_size, ramdisk_offset, vendor_boot_img,
vboot_header.vendor_ramdisk_size, vendor_ramdisk_offset));
return ret;
}
std::string BootImageUnpacker::kernel_cmdline() const {
return kernel_cmdline_;
}
bool BootImageUnpacker::ExtractKernelImage(const std::string& path) const {
if (kernel_image_size_ == 0) return false;
return ExtractFile(boot_image_, kernel_image_offset_, kernel_image_size_,
path);
}
bool BootImageUnpacker::ExtractRamdiskImage(const std::string& path) const {
if (ramdisk_image_size_ == 0) return false;
return ExtractFile(boot_image_, ramdisk_image_offset_, ramdisk_image_size_,
path);
}
bool BootImageUnpacker::ExtractVendorRamdiskImage(const std::string& path) const {
if (vendor_ramdisk_image_size_ == 0) return false;
return ExtractFile(vendor_boot_image_, vendor_ramdisk_image_offset_,
vendor_ramdisk_image_size_, path);
}
bool BootImageUnpacker::Unpack(const std::string& ramdisk_image_path,
const std::string& vendor_ramdisk_image_path,
const std::string& kernel_image_path) {
if (HasRamdiskImage()) {
if (!ExtractRamdiskImage(ramdisk_image_path)) {
LOG(ERROR) << "Error extracting ramdisk from boot image";
return false;
}
}
if (HasVendorRamdiskImage()) {
if (!ExtractVendorRamdiskImage(vendor_ramdisk_image_path)) {
LOG(ERROR) << "Error extracting vendor ramdisk from venodr boot image";
return false;
}
}
if (!kernel_image_path.empty()) {
if (HasKernelImage()) {
if (!ExtractKernelImage(kernel_image_path)) {
LOG(ERROR) << "Error extracting kernel from boot image";
return false;
}
} else {
LOG(ERROR) << "No kernel found on boot image";
return false;
}
}
return true;
}
} // namespace cvd
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