/*
* Copyright (C) 2007 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 "minadbd_services.h"
#include <errno.h>
#include <inttypes.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <functional>
#include <memory>
#include <set>
#include <string>
#include <string_view>
#include <thread>
#include <android-base/file.h>
#include <android-base/logging.h>
#include <android-base/memory.h>
#include <android-base/parseint.h>
#include <android-base/properties.h>
#include <android-base/stringprintf.h>
#include <android-base/strings.h>
#include "adb.h"
#include "adb_unique_fd.h"
#include "adb_utils.h"
#include "fuse_adb_provider.h"
#include "fuse_sideload.h"
#include "minadbd_types.h"
#include "services.h"
#include "sysdeps.h"
static int minadbd_socket = -1;
static bool rescue_mode = false;
static std::string sideload_mount_point = FUSE_SIDELOAD_HOST_MOUNTPOINT;
void SetMinadbdSocketFd(int socket_fd) {
minadbd_socket = socket_fd;
}
void SetMinadbdRescueMode(bool rescue) {
rescue_mode = rescue;
}
void SetSideloadMountPoint(const std::string& path) {
sideload_mount_point = path;
}
static bool WriteCommandToFd(MinadbdCommand cmd, int fd) {
char message[kMinadbdMessageSize];
memcpy(message, kMinadbdCommandPrefix, strlen(kMinadbdStatusPrefix));
android::base::put_unaligned(message + strlen(kMinadbdStatusPrefix), cmd);
if (!android::base::WriteFully(fd, message, kMinadbdMessageSize)) {
PLOG(ERROR) << "Failed to write message " << message;
return false;
}
return true;
}
// Blocks and reads the command status from |fd|. Returns false if the received message has a
// format error.
static bool WaitForCommandStatus(int fd, MinadbdCommandStatus* status) {
char buffer[kMinadbdMessageSize];
if (!android::base::ReadFully(fd, buffer, kMinadbdMessageSize)) {
PLOG(ERROR) << "Failed to response status from socket";
exit(kMinadbdSocketIOError);
}
std::string message(buffer, buffer + kMinadbdMessageSize);
if (!android::base::StartsWith(message, kMinadbdStatusPrefix)) {
LOG(ERROR) << "Failed to parse status in " << message;
return false;
}
*status = android::base::get_unaligned<MinadbdCommandStatus>(
message.substr(strlen(kMinadbdStatusPrefix)).c_str());
return true;
}
static MinadbdErrorCode RunAdbFuseSideload(int sfd, const std::string& args,
MinadbdCommandStatus* status) {
auto pieces = android::base::Split(args, ":");
int64_t file_size;
int block_size;
if (pieces.size() != 2 || !android::base::ParseInt(pieces[0], &file_size) || file_size <= 0 ||
!android::base::ParseInt(pieces[1], &block_size) || block_size <= 0) {
LOG(ERROR) << "bad sideload-host arguments: " << args;
return kMinadbdHostCommandArgumentError;
}
LOG(INFO) << "sideload-host file size " << file_size << ", block size " << block_size;
if (!WriteCommandToFd(MinadbdCommand::kInstall, minadbd_socket)) {
return kMinadbdSocketIOError;
}
auto adb_data_reader = std::make_unique<FuseAdbDataProvider>(sfd, file_size, block_size);
if (int result = run_fuse_sideload(std::move(adb_data_reader), sideload_mount_point.c_str());
result != 0) {
LOG(ERROR) << "Failed to start fuse";
return kMinadbdFuseStartError;
}
if (!WaitForCommandStatus(minadbd_socket, status)) {
return kMinadbdMessageFormatError;
}
// Signal host-side adb to stop. For sideload mode, we always send kMinadbdServicesExitSuccess
// (i.e. "DONEDONE") regardless of the install result. For rescue mode, we send failure message on
// install error.
if (!rescue_mode || *status == MinadbdCommandStatus::kSuccess) {
if (!android::base::WriteFully(sfd, kMinadbdServicesExitSuccess,
strlen(kMinadbdServicesExitSuccess))) {
return kMinadbdHostSocketIOError;
}
} else {
if (!android::base::WriteFully(sfd, kMinadbdServicesExitFailure,
strlen(kMinadbdServicesExitFailure))) {
return kMinadbdHostSocketIOError;
}
}
return kMinadbdSuccess;
}
// Sideload service always exits after serving an install command.
static void SideloadHostService(unique_fd sfd, const std::string& args) {
MinadbdCommandStatus status;
exit(RunAdbFuseSideload(sfd.get(), args, &status));
}
// Rescue service waits for the next command after an install command.
static void RescueInstallHostService(unique_fd sfd, const std::string& args) {
MinadbdCommandStatus status;
if (auto result = RunAdbFuseSideload(sfd.get(), args, &status); result != kMinadbdSuccess) {
exit(result);
}
}
// Answers the query on a given property |prop|, by writing the result to the given |sfd|. The
// result will be newline-terminated, so nonexistent or nonallowed query will be answered with "\n".
// If given an empty string, dumps all the supported properties (analogous to `adb shell getprop`)
// in lines, e.g. "[prop]: [value]".
static void RescueGetpropHostService(unique_fd sfd, const std::string& prop) {
static const std::set<std::string> kGetpropAllowedProps = {
"ro.build.date.utc",
"ro.build.fingerprint",
"ro.build.flavor",
"ro.build.id",
"ro.build.product",
"ro.build.tags",
"ro.build.version.incremental",
"ro.product.device",
"ro.product.vendor.device",
};
std::string result;
if (prop.empty()) {
for (const auto& key : kGetpropAllowedProps) {
auto value = android::base::GetProperty(key, "");
if (value.empty()) {
continue;
}
result += "[" + key + "]: [" + value + "]\n";
}
} else if (kGetpropAllowedProps.find(prop) != kGetpropAllowedProps.end()) {
result = android::base::GetProperty(prop, "") + "\n";
}
if (result.empty()) {
result = "\n";
}
if (!android::base::WriteFully(sfd, result.data(), result.size())) {
exit(kMinadbdHostSocketIOError);
}
// Send heartbeat signal to keep the rescue service alive.
if (!WriteCommandToFd(MinadbdCommand::kNoOp, minadbd_socket)) {
exit(kMinadbdSocketIOError);
}
if (MinadbdCommandStatus status; !WaitForCommandStatus(minadbd_socket, &status)) {
exit(kMinadbdMessageFormatError);
}
}
// Reboots into the given target. We don't reboot directly from minadbd, but going through recovery
// instead. This allows recovery to finish all the pending works (clear BCB, save logs etc) before
// the reboot.
static void RebootHostService(unique_fd /* sfd */, const std::string& target) {
MinadbdCommand command;
if (target == "bootloader") {
command = MinadbdCommand::kRebootBootloader;
} else if (target == "rescue") {
command = MinadbdCommand::kRebootRescue;
} else if (target == "recovery") {
command = MinadbdCommand::kRebootRecovery;
} else if (target == "fastboot") {
command = MinadbdCommand::kRebootFastboot;
} else {
command = MinadbdCommand::kRebootAndroid;
}
if (!WriteCommandToFd(command, minadbd_socket)) {
exit(kMinadbdSocketIOError);
}
MinadbdCommandStatus status;
if (!WaitForCommandStatus(minadbd_socket, &status)) {
exit(kMinadbdMessageFormatError);
}
}
static void WipeDeviceService(unique_fd fd, const std::string& args) {
auto pieces = android::base::Split(args, ":");
if (pieces.size() != 2 || pieces[0] != "userdata") {
LOG(ERROR) << "Failed to parse wipe device command arguments " << args;
exit(kMinadbdHostCommandArgumentError);
}
size_t message_size;
if (!android::base::ParseUint(pieces[1], &message_size) ||
message_size < strlen(kMinadbdServicesExitSuccess)) {
LOG(ERROR) << "Failed to parse wipe device message size in " << args;
exit(kMinadbdHostCommandArgumentError);
}
WriteCommandToFd(MinadbdCommand::kWipeData, minadbd_socket);
MinadbdCommandStatus status;
if (!WaitForCommandStatus(minadbd_socket, &status)) {
exit(kMinadbdMessageFormatError);
}
std::string response = (status == MinadbdCommandStatus::kSuccess) ? kMinadbdServicesExitSuccess
: kMinadbdServicesExitFailure;
response += std::string(message_size - response.size(), '\0');
if (!android::base::WriteFully(fd, response.c_str(), response.size())) {
exit(kMinadbdHostSocketIOError);
}
}
unique_fd daemon_service_to_fd(std::string_view name, atransport* /* transport */) {
// Common services that are supported both in sideload and rescue modes.
if (android::base::ConsumePrefix(&name, "reboot:")) {
// "reboot:<target>", where target must be one of the following.
std::string args(name);
if (args.empty() || args == "bootloader" || args == "rescue" || args == "recovery" ||
args == "fastboot") {
return create_service_thread("reboot",
std::bind(RebootHostService, std::placeholders::_1, args));
}
return unique_fd{};
}
// Rescue-specific services.
if (rescue_mode) {
if (android::base::ConsumePrefix(&name, "rescue-install:")) {
// rescue-install:<file-size>:<block-size>
std::string args(name);
return create_service_thread(
"rescue-install", std::bind(RescueInstallHostService, std::placeholders::_1, args));
} else if (android::base::ConsumePrefix(&name, "rescue-getprop:")) {
// rescue-getprop:<prop>
std::string args(name);
return create_service_thread(
"rescue-getprop", std::bind(RescueGetpropHostService, std::placeholders::_1, args));
} else if (android::base::ConsumePrefix(&name, "rescue-wipe:")) {
// rescue-wipe:target:<message-size>
std::string args(name);
return create_service_thread("rescue-wipe",
std::bind(WipeDeviceService, std::placeholders::_1, args));
}
return unique_fd{};
}
// Sideload-specific services.
if (name.starts_with("sideload:")) {
// This exit status causes recovery to print a special error message saying to use a newer adb
// (that supports sideload-host).
exit(kMinadbdAdbVersionError);
} else if (android::base::ConsumePrefix(&name, "sideload-host:")) {
// sideload-host:<file-size>:<block-size>
std::string args(name);
return create_service_thread("sideload-host",
std::bind(SideloadHostService, std::placeholders::_1, args));
}
return unique_fd{};
}
