fastboot/device/commands.cpp - android-core - Git at Google

 /*
  * 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 "commands.h"

 #include <sys/socket.h>
 #include <sys/un.h>

 #include <android-base/logging.h>
 #include <android-base/parseint.h>
 #include <android-base/properties.h>
 #include <android-base/stringprintf.h>
 #include <android-base/strings.h>
 #include <android-base/unique_fd.h>
 #include <cutils/android_reboot.h>
 #include <ext4_utils/wipe.h>
 #include <liblp/builder.h>
 #include <liblp/liblp.h>
 #include <uuid/uuid.h>

 #include "constants.h"
 #include "fastboot_device.h"
 #include "flashing.h"
 #include "utility.h"

 using ::android::hardware::hidl_string;
 using ::android::hardware::boot::V1_0::BoolResult;
 using ::android::hardware::boot::V1_0::CommandResult;
 using ::android::hardware::boot::V1_0::Slot;
 using ::android::hardware::fastboot::V1_0::Result;
 using ::android::hardware::fastboot::V1_0::Status;

 using namespace android::fs_mgr;

 struct VariableHandlers {
     // Callback to retrieve the value of a single variable.
     std::function<bool(FastbootDevice*, const std::vector<std::string>&, std::string*)> get;
     // Callback to retrieve all possible argument combinations, for getvar all.
     std::function<std::vector<std::vector<std::string>>(FastbootDevice*)> get_all_args;
 };

 static void GetAllVars(FastbootDevice* device, const std::string& name,
                        const VariableHandlers& handlers) {
     if (!handlers.get_all_args) {
         std::string message;
         if (!handlers.get(device, std::vector<std::string>(), &message)) {
             return;
         }
         device->WriteInfo(android::base::StringPrintf("%s:%s", name.c_str(), message.c_str()));
         return;
     }

     auto all_args = handlers.get_all_args(device);
     for (const auto& args : all_args) {
         std::string message;
         if (!handlers.get(device, args, &message)) {
             continue;
         }
         std::string arg_string = android::base::Join(args, ":");
         device->WriteInfo(android::base::StringPrintf("%s:%s:%s", name.c_str(), arg_string.c_str(),
                                                       message.c_str()));
     }
 }

 bool GetVarHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     const std::unordered_map<std::string, VariableHandlers> kVariableMap = {
             {FB_VAR_VERSION, {GetVersion, nullptr}},
             {FB_VAR_VERSION_BOOTLOADER, {GetBootloaderVersion, nullptr}},
             {FB_VAR_VERSION_BASEBAND, {GetBasebandVersion, nullptr}},
             {FB_VAR_PRODUCT, {GetProduct, nullptr}},
             {FB_VAR_SERIALNO, {GetSerial, nullptr}},
             {FB_VAR_VARIANT, {GetVariant, nullptr}},
             {FB_VAR_SECURE, {GetSecure, nullptr}},
             {FB_VAR_UNLOCKED, {GetUnlocked, nullptr}},
             {FB_VAR_MAX_DOWNLOAD_SIZE, {GetMaxDownloadSize, nullptr}},
             {FB_VAR_CURRENT_SLOT, {::GetCurrentSlot, nullptr}},
             {FB_VAR_SLOT_COUNT, {GetSlotCount, nullptr}},
             {FB_VAR_HAS_SLOT, {GetHasSlot, GetAllPartitionArgsNoSlot}},
             {FB_VAR_SLOT_SUCCESSFUL, {GetSlotSuccessful, nullptr}},
             {FB_VAR_SLOT_UNBOOTABLE, {GetSlotUnbootable, nullptr}},
             {FB_VAR_PARTITION_SIZE, {GetPartitionSize, GetAllPartitionArgsWithSlot}},
             {FB_VAR_PARTITION_TYPE, {GetPartitionType, GetAllPartitionArgsWithSlot}},
             {FB_VAR_IS_LOGICAL, {GetPartitionIsLogical, GetAllPartitionArgsWithSlot}},
             {FB_VAR_IS_USERSPACE, {GetIsUserspace, nullptr}},
             {FB_VAR_OFF_MODE_CHARGE_STATE, {GetOffModeChargeState, nullptr}},
             {FB_VAR_HW_REVISION, {GetHardwareRevision, nullptr}}};

     if (args.size() < 2) {
         return device->WriteFail("Missing argument");
     }

     // Special case: return all variables that we can.
     if (args[1] == "all") {
         for (const auto& [name, handlers] : kVariableMap) {
             GetAllVars(device, name, handlers);
         }
         return device->WriteOkay("");
     }

     // args[0] is command name, args[1] is variable.
     auto found_variable = kVariableMap.find(args[1]);
     if (found_variable == kVariableMap.end()) {
         return device->WriteFail("Unknown variable");
     }

     std::string message;
     std::vector<std::string> getvar_args(args.begin() + 2, args.end());
     if (!found_variable->second.get(device, getvar_args, &message)) {
         return device->WriteFail(message);
     }
     return device->WriteOkay(message);
 }

 bool EraseHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     if (args.size() < 2) {
         return device->WriteStatus(FastbootResult::FAIL, "Invalid arguments");
     }
     PartitionHandle handle;
     if (!OpenPartition(device, args[1], &handle)) {
         return device->WriteStatus(FastbootResult::FAIL, "Partition doesn't exist");
     }
     if (wipe_block_device(handle.fd(), get_block_device_size(handle.fd())) == 0) {
         return device->WriteStatus(FastbootResult::OKAY, "Erasing succeeded");
     }
     return device->WriteStatus(FastbootResult::FAIL, "Erasing failed");
 }

 bool OemCmdHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     auto fastboot_hal = device->fastboot_hal();
     if (!fastboot_hal) {
         return device->WriteStatus(FastbootResult::FAIL, "Unable to open fastboot HAL");
     }

     Result ret;
     auto ret_val = fastboot_hal->doOemCommand(args[0], [&](Result result) { ret = result; });
     if (!ret_val.isOk()) {
         return device->WriteStatus(FastbootResult::FAIL, "Unable to do OEM command");
     }
     if (ret.status != Status::SUCCESS) {
         return device->WriteStatus(FastbootResult::FAIL, ret.message);
     }

     return device->WriteStatus(FastbootResult::OKAY, ret.message);
 }

 bool DownloadHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     if (args.size() < 2) {
         return device->WriteStatus(FastbootResult::FAIL, "size argument unspecified");
     }
     // arg[0] is the command name, arg[1] contains size of data to be downloaded
     unsigned int size;
     if (!android::base::ParseUint("0x" + args[1], &size, UINT_MAX)) {
         return device->WriteStatus(FastbootResult::FAIL, "Invalid size");
     }
     device->download_data().resize(size);
     if (!device->WriteStatus(FastbootResult::DATA, android::base::StringPrintf("%08x", size))) {
         return false;
     }

     if (device->HandleData(true, &device->download_data())) {
         return device->WriteStatus(FastbootResult::OKAY, "");
     }

     PLOG(ERROR) << "Couldn't download data";
     return device->WriteStatus(FastbootResult::FAIL, "Couldn't download data");
 }

 bool FlashHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     if (args.size() < 2) {
         return device->WriteStatus(FastbootResult::FAIL, "Invalid arguments");
     }

     if (GetDeviceLockStatus()) {
         return device->WriteStatus(FastbootResult::FAIL,
                                    "Flashing is not allowed on locked devices");
     }

     int ret = Flash(device, args[1]);
     if (ret < 0) {
         return device->WriteStatus(FastbootResult::FAIL, strerror(-ret));
     }
     return device->WriteStatus(FastbootResult::OKAY, "Flashing succeeded");
 }

 bool SetActiveHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     if (args.size() < 2) {
         return device->WriteStatus(FastbootResult::FAIL, "Missing slot argument");
     }

     // Slot suffix needs to be between 'a' and 'z'.
     Slot slot;
     if (!GetSlotNumber(args[1], &slot)) {
         return device->WriteStatus(FastbootResult::FAIL, "Bad slot suffix");
     }

     // Non-A/B devices will not have a boot control HAL.
     auto boot_control_hal = device->boot_control_hal();
     if (!boot_control_hal) {
         return device->WriteStatus(FastbootResult::FAIL,
                                    "Cannot set slot: boot control HAL absent");
     }
     if (slot >= boot_control_hal->getNumberSlots()) {
         return device->WriteStatus(FastbootResult::FAIL, "Slot out of range");
     }
     CommandResult ret;
     auto cb = [&ret](CommandResult result) { ret = result; };
     auto result = boot_control_hal->setActiveBootSlot(slot, cb);
     if (result.isOk() && ret.success) return device->WriteStatus(FastbootResult::OKAY, "");
     return device->WriteStatus(FastbootResult::FAIL, "Unable to set slot");
 }

 bool ShutDownHandler(FastbootDevice* device, const std::vector<std::string>& /* args */) {
     auto result = device->WriteStatus(FastbootResult::OKAY, "Shutting down");
     android::base::SetProperty(ANDROID_RB_PROPERTY, "shutdown,fastboot");
     device->CloseDevice();
     TEMP_FAILURE_RETRY(pause());
     return result;
 }

 bool RebootHandler(FastbootDevice* device, const std::vector<std::string>& /* args */) {
     auto result = device->WriteStatus(FastbootResult::OKAY, "Rebooting");
     android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,from_fastboot");
     device->CloseDevice();
     TEMP_FAILURE_RETRY(pause());
     return result;
 }

 bool RebootBootloaderHandler(FastbootDevice* device, const std::vector<std::string>& /* args */) {
     auto result = device->WriteStatus(FastbootResult::OKAY, "Rebooting bootloader");
     android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,bootloader");
     device->CloseDevice();
     TEMP_FAILURE_RETRY(pause());
     return result;
 }

 bool RebootFastbootHandler(FastbootDevice* device, const std::vector<std::string>& /* args */) {
     auto result = device->WriteStatus(FastbootResult::OKAY, "Rebooting fastboot");
     android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,fastboot");
     device->CloseDevice();
     TEMP_FAILURE_RETRY(pause());
     return result;
 }

 static bool EnterRecovery() {
     const char msg_switch_to_recovery = 'r';

     android::base::unique_fd sock(socket(AF_UNIX, SOCK_STREAM, 0));
     if (sock < 0) {
         PLOG(ERROR) << "Couldn't create sock";
         return false;
     }

     struct sockaddr_un addr = {.sun_family = AF_UNIX};
     strncpy(addr.sun_path, "/dev/socket/recovery", sizeof(addr.sun_path) - 1);
     if (connect(sock, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
         PLOG(ERROR) << "Couldn't connect to recovery";
         return false;
     }
     // Switch to recovery will not update the boot reason since it does not
     // require a reboot.
     auto ret = write(sock, &msg_switch_to_recovery, sizeof(msg_switch_to_recovery));
     if (ret != sizeof(msg_switch_to_recovery)) {
         PLOG(ERROR) << "Couldn't write message to switch to recovery";
         return false;
     }

     return true;
 }

 bool RebootRecoveryHandler(FastbootDevice* device, const std::vector<std::string>& /* args */) {
     auto status = true;
     if (EnterRecovery()) {
         status = device->WriteStatus(FastbootResult::OKAY, "Rebooting to recovery");
     } else {
         status = device->WriteStatus(FastbootResult::FAIL, "Unable to reboot to recovery");
     }
     device->CloseDevice();
     TEMP_FAILURE_RETRY(pause());
     return status;
 }

 // Helper class for opening a handle to a MetadataBuilder and writing the new
 // partition table to the same place it was read.
 class PartitionBuilder {
   public:
     explicit PartitionBuilder(FastbootDevice* device);

     bool Write();
     bool Valid() const { return !!builder_; }
     MetadataBuilder* operator->() const { return builder_.get(); }

   private:
     std::string super_device_;
     uint32_t slot_number_;
     std::unique_ptr<MetadataBuilder> builder_;
 };

 PartitionBuilder::PartitionBuilder(FastbootDevice* device) {
     auto super_device = FindPhysicalPartition(LP_METADATA_PARTITION_NAME);
     if (!super_device) {
         return;
     }
     super_device_ = *super_device;

     std::string slot = device->GetCurrentSlot();
     slot_number_ = SlotNumberForSlotSuffix(slot);
     builder_ = MetadataBuilder::New(super_device_, slot_number_);
 }

 bool PartitionBuilder::Write() {
     std::unique_ptr<LpMetadata> metadata = builder_->Export();
     if (!metadata) {
         return false;
     }
     return UpdatePartitionTable(super_device_, *metadata.get(), slot_number_);
 }

 bool CreatePartitionHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     if (args.size() < 3) {
         return device->WriteFail("Invalid partition name and size");
     }

     if (GetDeviceLockStatus()) {
         return device->WriteStatus(FastbootResult::FAIL, "Command not available on locked devices");
     }

     uint64_t partition_size;
     std::string partition_name = args[1];
     if (!android::base::ParseUint(args[2].c_str(), &partition_size)) {
         return device->WriteFail("Invalid partition size");
     }

     PartitionBuilder builder(device);
     if (!builder.Valid()) {
         return device->WriteFail("Could not open super partition");
     }
     // TODO(112433293) Disallow if the name is in the physical table as well.
     if (builder->FindPartition(partition_name)) {
         return device->WriteFail("Partition already exists");
     }

     // Make a random UUID, since they're not currently used.
     uuid_t uuid;
     char uuid_str[37];
     uuid_generate_random(uuid);
     uuid_unparse(uuid, uuid_str);

     Partition* partition = builder->AddPartition(partition_name, uuid_str, 0);
     if (!partition) {
         return device->WriteFail("Failed to add partition");
     }
     if (!builder->ResizePartition(partition, partition_size)) {
         builder->RemovePartition(partition_name);
         return device->WriteFail("Not enough space for partition");
     }
     if (!builder.Write()) {
         return device->WriteFail("Failed to write partition table");
     }
     return device->WriteOkay("Partition created");
 }

 bool DeletePartitionHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     if (args.size() < 2) {
         return device->WriteFail("Invalid partition name and size");
     }

     if (GetDeviceLockStatus()) {
         return device->WriteStatus(FastbootResult::FAIL, "Command not available on locked devices");
     }

     PartitionBuilder builder(device);
     if (!builder.Valid()) {
         return device->WriteFail("Could not open super partition");
     }
     builder->RemovePartition(args[1]);
     if (!builder.Write()) {
         return device->WriteFail("Failed to write partition table");
     }
     return device->WriteOkay("Partition deleted");
 }

 bool ResizePartitionHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     if (args.size() < 3) {
         return device->WriteFail("Invalid partition name and size");
     }

     if (GetDeviceLockStatus()) {
         return device->WriteStatus(FastbootResult::FAIL, "Command not available on locked devices");
     }

     uint64_t partition_size;
     std::string partition_name = args[1];
     if (!android::base::ParseUint(args[2].c_str(), &partition_size)) {
         return device->WriteFail("Invalid partition size");
     }

     PartitionBuilder builder(device);
     if (!builder.Valid()) {
         return device->WriteFail("Could not open super partition");
     }

     Partition* partition = builder->FindPartition(partition_name);
     if (!partition) {
         return device->WriteFail("Partition does not exist");
     }
     if (!builder->ResizePartition(partition, partition_size)) {
         return device->WriteFail("Not enough space to resize partition");
     }
     if (!builder.Write()) {
         return device->WriteFail("Failed to write partition table");
     }
     return device->WriteOkay("Partition resized");
 }

 bool UpdateSuperHandler(FastbootDevice* device, const std::vector<std::string>& args) {
     if (args.size() < 2) {
         return device->WriteFail("Invalid arguments");
     }

     if (GetDeviceLockStatus()) {
         return device->WriteStatus(FastbootResult::FAIL, "Command not available on locked devices");
     }

     bool wipe = (args.size() >= 3 && args[2] == "wipe");
     return UpdateSuper(device, args[1], wipe);
 }
	/*
	* 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 "commands.h"

	#include <sys/socket.h>
	#include <sys/un.h>

	#include <android-base/logging.h>
	#include <android-base/parseint.h>
	#include <android-base/properties.h>
	#include <android-base/stringprintf.h>
	#include <android-base/strings.h>
	#include <android-base/unique_fd.h>
	#include <cutils/android_reboot.h>
	#include <ext4_utils/wipe.h>
	#include <liblp/builder.h>
	#include <liblp/liblp.h>
	#include <uuid/uuid.h>

	#include "constants.h"
	#include "fastboot_device.h"
	#include "flashing.h"
	#include "utility.h"

	using ::android::hardware::hidl_string;
	using ::android::hardware::boot::V1_0::BoolResult;
	using ::android::hardware::boot::V1_0::CommandResult;
	using ::android::hardware::boot::V1_0::Slot;
	using ::android::hardware::fastboot::V1_0::Result;
	using ::android::hardware::fastboot::V1_0::Status;

	using namespace android::fs_mgr;

	struct VariableHandlers {
	// Callback to retrieve the value of a single variable.
	std::function<bool(FastbootDevice, const std::vector<std::string>&, std::string)> get;
	// Callback to retrieve all possible argument combinations, for getvar all.
	std::function<std::vector<std::vector<std::string>>(FastbootDevice*)> get_all_args;
	};

	static void GetAllVars(FastbootDevice* device, const std::string& name,
	const VariableHandlers& handlers) {
	if (!handlers.get_all_args) {
	std::string message;
	if (!handlers.get(device, std::vector<std::string>(), &message)) {
	return;
	}
	device->WriteInfo(android::base::StringPrintf("%s:%s", name.c_str(), message.c_str()));
	return;
	}

	auto all_args = handlers.get_all_args(device);
	for (const auto& args : all_args) {
	std::string message;
	if (!handlers.get(device, args, &message)) {
	continue;
	}
	std::string arg_string = android::base::Join(args, ":");
	device->WriteInfo(android::base::StringPrintf("%s:%s:%s", name.c_str(), arg_string.c_str(),
	message.c_str()));
	}
	}

	bool GetVarHandler(FastbootDevice* device, const std::vector<std::string>& args) {
	const std::unordered_map<std::string, VariableHandlers> kVariableMap = {
	{FB_VAR_VERSION, {GetVersion, nullptr}},
	{FB_VAR_VERSION_BOOTLOADER, {GetBootloaderVersion, nullptr}},
	{FB_VAR_VERSION_BASEBAND, {GetBasebandVersion, nullptr}},
	{FB_VAR_PRODUCT, {GetProduct, nullptr}},
	{FB_VAR_SERIALNO, {GetSerial, nullptr}},
	{FB_VAR_VARIANT, {GetVariant, nullptr}},
	{FB_VAR_SECURE, {GetSecure, nullptr}},
	{FB_VAR_UNLOCKED, {GetUnlocked, nullptr}},
	{FB_VAR_MAX_DOWNLOAD_SIZE, {GetMaxDownloadSize, nullptr}},
	{FB_VAR_CURRENT_SLOT, {::GetCurrentSlot, nullptr}},
	{FB_VAR_SLOT_COUNT, {GetSlotCount, nullptr}},
	{FB_VAR_HAS_SLOT, {GetHasSlot, GetAllPartitionArgsNoSlot}},
	{FB_VAR_SLOT_SUCCESSFUL, {GetSlotSuccessful, nullptr}},
	{FB_VAR_SLOT_UNBOOTABLE, {GetSlotUnbootable, nullptr}},
	{FB_VAR_PARTITION_SIZE, {GetPartitionSize, GetAllPartitionArgsWithSlot}},
	{FB_VAR_PARTITION_TYPE, {GetPartitionType, GetAllPartitionArgsWithSlot}},
	{FB_VAR_IS_LOGICAL, {GetPartitionIsLogical, GetAllPartitionArgsWithSlot}},
	{FB_VAR_IS_USERSPACE, {GetIsUserspace, nullptr}},
	{FB_VAR_OFF_MODE_CHARGE_STATE, {GetOffModeChargeState, nullptr}},
	{FB_VAR_HW_REVISION, {GetHardwareRevision, nullptr}}};

	if (args.size() < 2) {
	return device->WriteFail("Missing argument");
	}

	// Special case: return all variables that we can.
	if (args[1] == "all") {
	for (const auto& [name, handlers] : kVariableMap) {
	GetAllVars(device, name, handlers);
	}
	return device->WriteOkay("");
	}

	// args[0] is command name, args[1] is variable.
	auto found_variable = kVariableMap.find(args[1]);
	if (found_variable == kVariableMap.end()) {
	return device->WriteFail("Unknown variable");
	}

	std::string message;
	std::vector<std::string> getvar_args(args.begin() + 2, args.end());
	if (!found_variable->second.get(device, getvar_args, &message)) {
	return device->WriteFail(message);
	}
	return device->WriteOkay(message);
	}

	bool EraseHandler(FastbootDevice* device, const std::vector<std::string>& args) {
	if (args.size() < 2) {
	return device->WriteStatus(FastbootResult::FAIL, "Invalid arguments");
	}
	PartitionHandle handle;
	if (!OpenPartition(device, args[1], &handle)) {
	return device->WriteStatus(FastbootResult::FAIL, "Partition doesn't exist");
	}
	if (wipe_block_device(handle.fd(), get_block_device_size(handle.fd())) == 0) {
	return device->WriteStatus(FastbootResult::OKAY, "Erasing succeeded");
	}
	return device->WriteStatus(FastbootResult::FAIL, "Erasing failed");
	}

	bool OemCmdHandler(FastbootDevice* device, const std::vector<std::string>& args) {
	auto fastboot_hal = device->fastboot_hal();
	if (!fastboot_hal) {
	return device->WriteStatus(FastbootResult::FAIL, "Unable to open fastboot HAL");
	}

	Result ret;
	auto ret_val = fastboot_hal->doOemCommand(args[0], [&](Result result) { ret = result; });
	if (!ret_val.isOk()) {
	return device->WriteStatus(FastbootResult::FAIL, "Unable to do OEM command");
	}
	if (ret.status != Status::SUCCESS) {
	return device->WriteStatus(FastbootResult::FAIL, ret.message);
	}

	return device->WriteStatus(FastbootResult::OKAY, ret.message);
	}

	bool DownloadHandler(FastbootDevice* device, const std::vector<std::string>& args) {
	if (args.size() < 2) {
	return device->WriteStatus(FastbootResult::FAIL, "size argument unspecified");
	}
	// arg[0] is the command name, arg[1] contains size of data to be downloaded
	unsigned int size;
	if (!android::base::ParseUint("0x" + args[1], &size, UINT_MAX)) {
	return device->WriteStatus(FastbootResult::FAIL, "Invalid size");
	}
	device->download_data().resize(size);
	if (!device->WriteStatus(FastbootResult::DATA, android::base::StringPrintf("%08x", size))) {
	return false;
	}

	if (device->HandleData(true, &device->download_data())) {
	return device->WriteStatus(FastbootResult::OKAY, "");
	}

	PLOG(ERROR) << "Couldn't download data";
	return device->WriteStatus(FastbootResult::FAIL, "Couldn't download data");
	}

	bool FlashHandler(FastbootDevice* device, const std::vector<std::string>& args) {
	if (args.size() < 2) {
	return device->WriteStatus(FastbootResult::FAIL, "Invalid arguments");
	}

	if (GetDeviceLockStatus()) {
	return device->WriteStatus(FastbootResult::FAIL,
	"Flashing is not allowed on locked devices");
	}

	int ret = Flash(device, args[1]);
	if (ret < 0) {
	return device->WriteStatus(FastbootResult::FAIL, strerror(-ret));
	}
	return device->WriteStatus(FastbootResult::OKAY, "Flashing succeeded");
	}

	bool SetActiveHandler(FastbootDevice* device, const std::vector<std::string>& args) {
	if (args.size() < 2) {
	return device->WriteStatus(FastbootResult::FAIL, "Missing slot argument");
	}

	// Slot suffix needs to be between 'a' and 'z'.
	Slot slot;
	if (!GetSlotNumber(args[1], &slot)) {
	return device->WriteStatus(FastbootResult::FAIL, "Bad slot suffix");
	}

	// Non-A/B devices will not have a boot control HAL.
	auto boot_control_hal = device->boot_control_hal();
	if (!boot_control_hal) {
	return device->WriteStatus(FastbootResult::FAIL,
	"Cannot set slot: boot control HAL absent");
	}
	if (slot >= boot_control_hal->getNumberSlots()) {
	return device->WriteStatus(FastbootResult::FAIL, "Slot out of range");
	}
	CommandResult ret;
	auto cb = [&ret](CommandResult result) { ret = result; };
	auto result = boot_control_hal->setActiveBootSlot(slot, cb);
	if (result.isOk() && ret.success) return device->WriteStatus(FastbootResult::OKAY, "");
	return device->WriteStatus(FastbootResult::FAIL, "Unable to set slot");
	}

	bool ShutDownHandler(FastbootDevice* device, const std::vector<std::string>& /* args */) {
	auto result = device->WriteStatus(FastbootResult::OKAY, "Shutting down");
	android::base::SetProperty(ANDROID_RB_PROPERTY, "shutdown,fastboot");
	device->CloseDevice();
	TEMP_FAILURE_RETRY(pause());
	return result;
	}

	bool RebootHandler(FastbootDevice* device, const std::vector<std::string>& /* args */) {
	auto result = device->WriteStatus(FastbootResult::OKAY, "Rebooting");
	android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,from_fastboot");
	device->CloseDevice();
	TEMP_FAILURE_RETRY(pause());
	return result;
	}

	bool RebootBootloaderHandler(FastbootDevice* device, const std::vector<std::string>& /* args */) {
	auto result = device->WriteStatus(FastbootResult::OKAY, "Rebooting bootloader");
	android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,bootloader");
	device->CloseDevice();
	TEMP_FAILURE_RETRY(pause());
	return result;
	}

	bool RebootFastbootHandler(FastbootDevice* device, const std::vector<std::string>& /* args */) {
	auto result = device->WriteStatus(FastbootResult::OKAY, "Rebooting fastboot");
	android::base::SetProperty(ANDROID_RB_PROPERTY, "reboot,fastboot");
	device->CloseDevice();
	TEMP_FAILURE_RETRY(pause());
	return result;
	}

	static bool EnterRecovery() {
	const char msg_switch_to_recovery = 'r';

	android::base::unique_fd sock(socket(AF_UNIX, SOCK_STREAM, 0));
	if (sock < 0) {
	PLOG(ERROR) << "Couldn't create sock";
	return false;
	}

	struct sockaddr_un addr = {.sun_family = AF_UNIX};
	strncpy(addr.sun_path, "/dev/socket/recovery", sizeof(addr.sun_path) - 1);
	if (connect(sock, (struct sockaddr*)&addr, sizeof(addr)) < 0) {
	PLOG(ERROR) << "Couldn't connect to recovery";
	return false;
	}
	// Switch to recovery will not update the boot reason since it does not
	// require a reboot.
	auto ret = write(sock, &msg_switch_to_recovery, sizeof(msg_switch_to_recovery));
	if (ret != sizeof(msg_switch_to_recovery)) {
	PLOG(ERROR) << "Couldn't write message to switch to recovery";
	return false;
	}

	return true;
	}

	bool RebootRecoveryHandler(FastbootDevice* device, const std::vector<std::string>& /* args */) {
	auto status = true;
	if (EnterRecovery()) {
	status = device->WriteStatus(FastbootResult::OKAY, "Rebooting to recovery");
	} else {
	status = device->WriteStatus(FastbootResult::FAIL, "Unable to reboot to recovery");
	}
	device->CloseDevice();
	TEMP_FAILURE_RETRY(pause());
	return status;
	}

	// Helper class for opening a handle to a MetadataBuilder and writing the new
	// partition table to the same place it was read.
	class PartitionBuilder {
	public:
	explicit PartitionBuilder(FastbootDevice* device);

	bool Write();
	bool Valid() const { return !!builder_; }
	MetadataBuilder* operator->() const { return builder_.get(); }

	private:
	std::string super_device_;
	uint32_t slot_number_;
	std::unique_ptr<MetadataBuilder> builder_;
	};

	PartitionBuilder::PartitionBuilder(FastbootDevice* device) {
	auto super_device = FindPhysicalPartition(LP_METADATA_PARTITION_NAME);
	if (!super_device) {
	return;
	}
	super_device_ = *super_device;

	std::string slot = device->GetCurrentSlot();
	slot_number_ = SlotNumberForSlotSuffix(slot);
	builder_ = MetadataBuilder::New(super_device_, slot_number_);
	}

	bool PartitionBuilder::Write() {
	std::unique_ptr<LpMetadata> metadata = builder_->Export();
	if (!metadata) {
	return false;
	}
	return UpdatePartitionTable(super_device_, *metadata.get(), slot_number_);
	}

	bool CreatePartitionHandler(FastbootDevice* device, const std::vector<std::string>& args) {
	if (args.size() < 3) {
	return device->WriteFail("Invalid partition name and size");
	}

	if (GetDeviceLockStatus()) {
	return device->WriteStatus(FastbootResult::FAIL, "Command not available on locked devices");
	}

	uint64_t partition_size;
	std::string partition_name = args[1];
	if (!android::base::ParseUint(args[2].c_str(), &partition_size)) {
	return device->WriteFail("Invalid partition size");
	}

	PartitionBuilder builder(device);
	if (!builder.Valid()) {
	return device->WriteFail("Could not open super partition");
	}
	// TODO(112433293) Disallow if the name is in the physical table as well.
	if (builder->FindPartition(partition_name)) {
	return device->WriteFail("Partition already exists");
	}

	// Make a random UUID, since they're not currently used.
	uuid_t uuid;
	char uuid_str[37];
	uuid_generate_random(uuid);
	uuid_unparse(uuid, uuid_str);

	Partition* partition = builder->AddPartition(partition_name, uuid_str, 0);
	if (!partition) {
	return device->WriteFail("Failed to add partition");
	}
	if (!builder->ResizePartition(partition, partition_size)) {
	builder->RemovePartition(partition_name);
	return device->WriteFail("Not enough space for partition");
	}
	if (!builder.Write()) {
	return device->WriteFail("Failed to write partition table");
	}
	return device->WriteOkay("Partition created");
	}

	bool DeletePartitionHandler(FastbootDevice* device, const std::vector<std::string>& args) {
	if (args.size() < 2) {
	return device->WriteFail("Invalid partition name and size");
	}

	if (GetDeviceLockStatus()) {
	return device->WriteStatus(FastbootResult::FAIL, "Command not available on locked devices");
	}

	PartitionBuilder builder(device);
	if (!builder.Valid()) {
	return device->WriteFail("Could not open super partition");
	}
	builder->RemovePartition(args[1]);
	if (!builder.Write()) {
	return device->WriteFail("Failed to write partition table");
	}
	return device->WriteOkay("Partition deleted");
	}

	bool ResizePartitionHandler(FastbootDevice* device, const std::vector<std::string>& args) {
	if (args.size() < 3) {
	return device->WriteFail("Invalid partition name and size");
	}

	if (GetDeviceLockStatus()) {
	return device->WriteStatus(FastbootResult::FAIL, "Command not available on locked devices");
	}

	uint64_t partition_size;
	std::string partition_name = args[1];
	if (!android::base::ParseUint(args[2].c_str(), &partition_size)) {
	return device->WriteFail("Invalid partition size");
	}

	PartitionBuilder builder(device);
	if (!builder.Valid()) {
	return device->WriteFail("Could not open super partition");
	}

	Partition* partition = builder->FindPartition(partition_name);
	if (!partition) {
	return device->WriteFail("Partition does not exist");
	}
	if (!builder->ResizePartition(partition, partition_size)) {
	return device->WriteFail("Not enough space to resize partition");
	}
	if (!builder.Write()) {
	return device->WriteFail("Failed to write partition table");
	}
	return device->WriteOkay("Partition resized");
	}

	bool UpdateSuperHandler(FastbootDevice* device, const std::vector<std::string>& args) {
	if (args.size() < 2) {
	return device->WriteFail("Invalid arguments");
	}

	if (GetDeviceLockStatus()) {
	return device->WriteStatus(FastbootResult::FAIL, "Command not available on locked devices");
	}

	bool wipe = (args.size() >= 3 && args[2] == "wipe");
	return UpdateSuper(device, args[1], wipe);
	}