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/*
* Copyright (C) 2021 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 "ServiceManagerHost.h"
#include <android-base/parseint.h>
#include <android-base/strings.h>
#include <binder/IServiceManager.h>
#include <binder/RpcSession.h>
#include "UtilsHost.h"
namespace android {
namespace {
const void* kDeviceServiceExtraId = "DeviceServiceExtra";
// Parse stdout of program execution to string. If any error, return 0.
unsigned int parsePortNumber(const std::string& out, const std::string& what) {
auto trimmed = android::base::Trim(out);
unsigned int port = 0;
if (!android::base::ParseUint(trimmed, &port)) {
int savedErrno = errno;
ALOGE("%s is not a valid %s: %s", trimmed.c_str(), what.c_str(), strerror(savedErrno));
return 0;
}
if (port == 0) {
ALOGE("0 is not a valid %s", what.c_str());
return 0; // explicitly
}
return port;
}
// RAII object for adb forwarding
class AdbForwarder {
public:
AdbForwarder() = default;
static std::optional<AdbForwarder> forward(unsigned int devicePort);
AdbForwarder(AdbForwarder&& other) noexcept { (*this) = std::move(other); }
AdbForwarder& operator=(AdbForwarder&&) noexcept;
~AdbForwarder();
[[nodiscard]] const std::optional<unsigned int>& hostPort() const { return mPort; }
private:
DISALLOW_COPY_AND_ASSIGN(AdbForwarder);
explicit AdbForwarder(unsigned int port) : mPort(port) {}
std::optional<unsigned int> mPort;
};
std::optional<AdbForwarder> AdbForwarder::forward(unsigned int devicePort) {
auto result =
execute({"adb", "forward", "tcp:0", "tcp:" + std::to_string(devicePort)}, nullptr);
if (!result.ok()) {
ALOGE("Unable to run `adb forward tcp:0 tcp:%d`: %s", devicePort,
result.error().message().c_str());
return std::nullopt;
}
// Must end with exit code 0 (`has_value() && value() == 0`)
if (result->exitCode.value_or(1) != 0) {
ALOGE("Unable to run `adb forward tcp:0 tcp:%d`, command exits with %s", devicePort,
result->toString().c_str());
return std::nullopt;
}
if (!result->stderrStr.empty()) {
LOG_HOST("`adb forward tcp:0 tcp:%d` writes to stderr: %s", devicePort,
result->stderrStr.c_str());
}
unsigned int hostPort = parsePortNumber(result->stdoutStr, "host port");
if (hostPort == 0) return std::nullopt;
return AdbForwarder(hostPort);
}
AdbForwarder& AdbForwarder::operator=(AdbForwarder&& other) noexcept {
std::swap(mPort, other.mPort);
return *this;
}
AdbForwarder::~AdbForwarder() {
if (!mPort.has_value()) return;
auto result = execute({"adb", "forward", "--remove", "tcp:" + std::to_string(*mPort)}, nullptr);
if (!result.ok()) {
ALOGE("Unable to run `adb forward --remove tcp:%d`: %s", *mPort,
result.error().message().c_str());
return;
}
// Must end with exit code 0 (`has_value() && value() == 0`)
if (result->exitCode.value_or(1) != 0) {
ALOGE("Unable to run `adb forward --remove tcp:%d`, command exits with %s", *mPort,
result->toString().c_str());
return;
}
if (!result->stderrStr.empty()) {
LOG_HOST("`adb forward --remove tcp:%d` writes to stderr: %s", *mPort,
result->stderrStr.c_str());
}
LOG_HOST("Successfully run `adb forward --remove tcp:%d`", *mPort);
}
void cleanupCommandResult(const void* id, void* obj, void* /* cookie */) {
LOG_ALWAYS_FATAL_IF(id != kDeviceServiceExtraId,
"cleanupCommandResult invoked with mismatched ID %p, "
"expected %p",
id, kDeviceServiceExtraId);
auto ptr = static_cast<CommandResult*>(obj);
delete ptr;
}
} // namespace
sp<IBinder> getDeviceService(std::vector<std::string>&& serviceDispatcherArgs,
const RpcDelegateServiceManagerOptions& options) {
std::vector<std::string> prefix{"adb", "shell", "servicedispatcher"};
serviceDispatcherArgs.insert(serviceDispatcherArgs.begin(), prefix.begin(), prefix.end());
auto result = execute(std::move(serviceDispatcherArgs), &CommandResult::stdoutEndsWithNewLine);
if (!result.ok()) {
ALOGE("%s", result.error().message().c_str());
return nullptr;
}
// `servicedispatcher` process must be alive to keep the port open.
if (result->exitCode.has_value()) {
ALOGE("Command exits with: %s", result->toString().c_str());
return nullptr;
}
if (!result->stderrStr.empty()) {
LOG_HOST("servicedispatcher writes to stderr: %s", result->stderrStr.c_str());
}
if (!result->stdoutEndsWithNewLine()) {
ALOGE("Unexpected command result: %s", result->toString().c_str());
return nullptr;
}
unsigned int devicePort = parsePortNumber(result->stdoutStr, "device port");
if (devicePort == 0) return nullptr;
auto forwardResult = AdbForwarder::forward(devicePort);
if (!forwardResult.has_value()) {
return nullptr;
}
LOG_ALWAYS_FATAL_IF(!forwardResult->hostPort().has_value());
auto rpcSession = RpcSession::make();
if (options.maxOutgoingConnections.has_value()) {
rpcSession->setMaxOutgoingConnections(*options.maxOutgoingConnections);
}
if (status_t status = rpcSession->setupInetClient("127.0.0.1", *forwardResult->hostPort());
status != OK) {
ALOGE("Unable to set up inet client on host port %u: %s", *forwardResult->hostPort(),
statusToString(status).c_str());
return nullptr;
}
auto binder = rpcSession->getRootObject();
if (binder == nullptr) {
ALOGE("RpcSession::getRootObject returns nullptr");
return nullptr;
}
LOG_ALWAYS_FATAL_IF(
nullptr !=
binder->attachObject(kDeviceServiceExtraId,
static_cast<void*>(new CommandResult(std::move(*result))), nullptr,
&cleanupCommandResult));
return binder;
}
} // namespace android
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