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253 lines
8.7 KiB
253 lines
8.7 KiB
4 months ago
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/*
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* Copyright (C) 2016 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 "bootloader_message.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include <string>
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#include <vector>
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#include <android-base/file.h>
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#include <android-base/properties.h>
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#include <android-base/stringprintf.h>
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#include <android-base/unique_fd.h>
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#include <fstab/fstab.h>
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using android::fs_mgr::Fstab;
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using android::fs_mgr::GetEntryForMountPoint;
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using android::fs_mgr::ReadDefaultFstab;
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constexpr off_t kBootloaderControlOffset = offsetof(bootloader_message_ab, slot_suffix);
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static std::string get_misc_blk_device(std::string* err) {
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Fstab fstab;
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if (!ReadDefaultFstab(&fstab)) {
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*err = "failed to read default fstab";
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return "";
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}
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auto record = GetEntryForMountPoint(&fstab, "/misc");
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if (record == nullptr) {
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*err = "failed to find /misc partition";
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return "";
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}
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return record->blk_device;
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}
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// In recovery mode, recovery can get started and try to access the misc
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// device before the kernel has actually created it.
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static bool wait_for_device(const std::string& blk_device, std::string* err) {
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int tries = 0;
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int ret;
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err->clear();
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do {
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++tries;
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struct stat buf;
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ret = stat(blk_device.c_str(), &buf);
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if (ret == -1) {
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*err += android::base::StringPrintf("failed to stat %s try %d: %s\n",
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blk_device.c_str(), tries, strerror(errno));
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sleep(1);
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}
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} while (ret && tries < 10);
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if (ret) {
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*err += android::base::StringPrintf("failed to stat %s\n", blk_device.c_str());
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}
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return ret == 0;
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}
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static bool read_misc_partition(void* p, size_t size, const std::string& misc_blk_device,
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size_t offset, std::string* err) {
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if (!wait_for_device(misc_blk_device, err)) {
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return false;
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}
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android::base::unique_fd fd(open(misc_blk_device.c_str(), O_RDONLY));
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if (fd == -1) {
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*err = android::base::StringPrintf("failed to open %s: %s", misc_blk_device.c_str(),
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strerror(errno));
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return false;
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}
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if (lseek(fd, static_cast<off_t>(offset), SEEK_SET) != static_cast<off_t>(offset)) {
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*err = android::base::StringPrintf("failed to lseek %s: %s", misc_blk_device.c_str(),
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strerror(errno));
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return false;
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}
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if (!android::base::ReadFully(fd, p, size)) {
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*err = android::base::StringPrintf("failed to read %s: %s", misc_blk_device.c_str(),
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strerror(errno));
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return false;
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}
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return true;
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}
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static bool write_misc_partition(const void* p, size_t size, const std::string& misc_blk_device,
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size_t offset, std::string* err) {
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android::base::unique_fd fd(open(misc_blk_device.c_str(), O_WRONLY));
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if (fd == -1) {
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*err = android::base::StringPrintf("failed to open %s: %s", misc_blk_device.c_str(),
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strerror(errno));
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return false;
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}
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if (lseek(fd, static_cast<off_t>(offset), SEEK_SET) != static_cast<off_t>(offset)) {
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*err = android::base::StringPrintf("failed to lseek %s: %s", misc_blk_device.c_str(),
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strerror(errno));
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return false;
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}
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if (!android::base::WriteFully(fd, p, size)) {
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*err = android::base::StringPrintf("failed to write %s: %s", misc_blk_device.c_str(),
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strerror(errno));
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return false;
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}
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if (fsync(fd) == -1) {
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*err = android::base::StringPrintf("failed to fsync %s: %s", misc_blk_device.c_str(),
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strerror(errno));
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return false;
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}
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return true;
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}
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std::string get_bootloader_message_blk_device(std::string* err) {
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std::string misc_blk_device = get_misc_blk_device(err);
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if (misc_blk_device.empty()) return "";
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if (!wait_for_device(misc_blk_device, err)) return "";
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return misc_blk_device;
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}
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bool read_bootloader_message_from(bootloader_message* boot, const std::string& misc_blk_device,
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std::string* err) {
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return read_misc_partition(boot, sizeof(*boot), misc_blk_device,
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BOOTLOADER_MESSAGE_OFFSET_IN_MISC, err);
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}
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bool read_bootloader_message(bootloader_message* boot, std::string* err) {
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std::string misc_blk_device = get_misc_blk_device(err);
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if (misc_blk_device.empty()) {
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return false;
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}
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return read_bootloader_message_from(boot, misc_blk_device, err);
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}
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bool read_bootloader_control_from(bootloader_control* boot_ctrl, const std::string& misc_blk_device,
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std::string* err) {
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return read_misc_partition(boot_ctrl, sizeof(bootloader_control), misc_blk_device,
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kBootloaderControlOffset, err);
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}
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bool write_bootloader_message_to(const bootloader_message& boot, const std::string& misc_blk_device,
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std::string* err) {
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return write_misc_partition(&boot, sizeof(boot), misc_blk_device,
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BOOTLOADER_MESSAGE_OFFSET_IN_MISC, err);
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}
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bool write_bootloader_message(const bootloader_message& boot, std::string* err) {
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std::string misc_blk_device = get_misc_blk_device(err);
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if (misc_blk_device.empty()) {
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return false;
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}
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return write_bootloader_message_to(boot, misc_blk_device, err);
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}
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bool write_bootloader_control_to(const bootloader_control* boot_ctrl, const std::string& misc_blk_device,
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std::string* err) {
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return write_misc_partition(boot_ctrl, sizeof(bootloader_control), misc_blk_device,
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kBootloaderControlOffset, err);
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}
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bool clear_bootloader_message(std::string* err) {
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bootloader_message boot = {};
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return write_bootloader_message(boot, err);
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}
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bool write_bootloader_message(const std::vector<std::string>& options, std::string* err) {
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bootloader_message boot = {};
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update_bootloader_message_in_struct(&boot, options);
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return write_bootloader_message(boot, err);
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}
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bool update_bootloader_message(const std::vector<std::string>& options, std::string* err) {
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bootloader_message boot;
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if (!read_bootloader_message(&boot, err)) {
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return false;
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}
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update_bootloader_message_in_struct(&boot, options);
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return write_bootloader_message(boot, err);
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}
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bool update_bootloader_message_in_struct(bootloader_message* boot,
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const std::vector<std::string>& options) {
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if (!boot) return false;
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// Replace the command & recovery fields.
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memset(boot->command, 0, sizeof(boot->command));
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memset(boot->recovery, 0, sizeof(boot->recovery));
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strlcpy(boot->command, "boot-recovery", sizeof(boot->command));
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strlcpy(boot->recovery, "recovery\n", sizeof(boot->recovery));
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for (const auto& s : options) {
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strlcat(boot->recovery, s.c_str(), sizeof(boot->recovery));
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if (s.back() != '\n') {
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strlcat(boot->recovery, "\n", sizeof(boot->recovery));
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}
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}
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return true;
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}
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bool write_reboot_bootloader(std::string* err) {
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bootloader_message boot;
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if (!read_bootloader_message(&boot, err)) {
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return false;
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}
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if (boot.command[0] != '\0') {
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*err = "Bootloader command pending.";
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return false;
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}
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strlcpy(boot.command, "bootonce-bootloader", sizeof(boot.command));
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return write_bootloader_message(boot, err);
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}
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bool read_wipe_package(std::string* package_data, size_t size, std::string* err) {
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std::string misc_blk_device = get_misc_blk_device(err);
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if (misc_blk_device.empty()) {
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return false;
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}
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package_data->resize(size);
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return read_misc_partition(&(*package_data)[0], size, misc_blk_device,
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WIPE_PACKAGE_OFFSET_IN_MISC, err);
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}
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bool write_wipe_package(const std::string& package_data, std::string* err) {
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std::string misc_blk_device = get_misc_blk_device(err);
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if (misc_blk_device.empty()) {
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return false;
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}
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return write_misc_partition(package_data.data(), package_data.size(), misc_blk_device,
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WIPE_PACKAGE_OFFSET_IN_MISC, err);
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}
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extern "C" bool write_reboot_bootloader(void) {
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std::string err;
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return write_reboot_bootloader(&err);
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}
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extern "C" bool write_bootloader_message(const char* options) {
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std::string err;
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return write_bootloader_message({options}, &err);
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}
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