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/*
* 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 <string>
#include <string_view>
#include <thread>
#include <unordered_set>
#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 "fdevent.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;
void SetMinadbdSocketFd(int socket_fd) {
minadbd_socket = socket_fd;
}
void SetMinadbdRescueMode(bool rescue) {
rescue_mode = rescue;
}
static bool WriteCommandToFd(MinadbdCommands 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 kMinadbdPackageSizeError;
}
LOG(INFO) << "sideload-host file size " << file_size << ", block size " << block_size;
if (!WriteCommandToFd(MinadbdCommands::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)); 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 kSideloadServiceExitSuccess
// (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, kSideloadServiceExitSuccess,
strlen(kSideloadServiceExitSuccess))) {
return kMinadbdHostSocketIOError;
}
} else {
if (!android::base::WriteFully(sfd, kSideloadServiceExitFailure,
strlen(kSideloadServiceExitFailure))) {
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);
}
}
static void RescueGetpropHostService(unique_fd sfd, const std::string& prop) {
static const std::unordered_set<std::string> kGetpropAllowedProps = {
"ro.build.fingerprint",
"ro.build.date.utc",
};
auto allowed = kGetpropAllowedProps.find(prop) != kGetpropAllowedProps.end();
if (!allowed) {
return;
}
auto result = android::base::GetProperty(prop, "");
if (result.empty()) {
return;
}
if (!android::base::WriteFully(sfd, result.data(), result.size())) {
exit(kMinadbdHostSocketIOError);
}
}
unique_fd daemon_service_to_fd(std::string_view name, atransport* /* transport */) {
if (rescue_mode) {
if (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 (ConsumePrefix(&name, "rescue-getprop:")) {
// rescue-getprop:<prop>
std::string args(name);
return create_service_thread(
"rescue-getprop", std::bind(RescueGetpropHostService, std::placeholders::_1, args));
}
return unique_fd{};
}
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 (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{};
}
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