Add servicedispatcher

        export_aidl_headers: true,

    },

}

cc_binary {

    name: "servicedispatcher",

    host_supported: false,

    srcs: [

        "servicedispatcher.cpp",

    ],

    shared_libs: [

        "libbase",

        "libbinder",

        "liblog",

        "libutils",

    ],

}

/*

 * 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 <stdint.h>

#include <sysexits.h>

#include <unistd.h>

#include <iostream>

#include <android-base/file.h>

#include <android-base/logging.h>

#include <android-base/parseint.h>

#include <android-base/properties.h>

#include <android-base/stringprintf.h>

#include <binder/IServiceManager.h>

#include <binder/RpcServer.h>

using android::defaultServiceManager;

using android::OK;

using android::RpcServer;

using android::statusToString;

using android::String16;

using android::base::Basename;

using android::base::GetBoolProperty;

using android::base::InitLogging;

using android::base::LogdLogger;

using android::base::LogId;

using android::base::LogSeverity;

using android::base::ParseUint;

using android::base::StdioLogger;

using android::base::StringPrintf;

namespace {

int Usage(const char* program) {

    auto format = R"(dispatch calls to RPC service.

Usage:

  %s [-n <num_threads>] <service_name>

    -n <num_threads>: number of RPC threads added to the service (default 1).

    <service_name>: the service to connect to.

)";

    LOG(ERROR) << StringPrintf(format, Basename(program).c_str());

    return EX_USAGE;

}

int Dispatch(const char* name, uint32_t numThreads) {

    auto sm = defaultServiceManager();

    if (nullptr == sm) {

        LOG(ERROR) << "No servicemanager";

        return EX_SOFTWARE;

    }

    auto binder = sm->checkService(String16(name));

    if (nullptr == binder) {

        LOG(ERROR) << "No service \"" << name << "\"";

        return EX_SOFTWARE;

    }

    auto rpcServer = RpcServer::make();

    if (nullptr == rpcServer) {

        LOG(ERROR) << "Cannot create RpcServer";

        return EX_SOFTWARE;

    }

    rpcServer->iUnderstandThisCodeIsExperimentalAndIWillNotUseItInProduction();

    unsigned int port;

    if (!rpcServer->setupInetServer(0, &port)) {

        LOG(ERROR) << "setupInetServer failed";

        return EX_SOFTWARE;

    }

    auto socket = rpcServer->releaseServer();

    auto status = binder->setRpcClientDebug(std::move(socket), numThreads);

    if (status != OK) {

        LOG(ERROR) << "setRpcClientDebug failed with " << statusToString(status);

        return EX_SOFTWARE;

    }

    LOG(INFO) << "Finish setting up RPC on service " << name << " with " << numThreads

              << " threads on port" << port;

    std::cout << port << std::endl;

    return EX_OK;

}

// Log to logd. For warning and more severe messages, also log to stderr.

class ServiceDispatcherLogger {

public:

    void operator()(LogId id, LogSeverity severity, const char* tag, const char* file,

                    unsigned int line, const char* message) {

        mLogdLogger(id, severity, tag, file, line, message);

        if (severity >= LogSeverity::WARNING) {

            std::cout << std::flush;

            std::cerr << Basename(getprogname()) << ": " << message << std::endl;

        }

    }

private:

    LogdLogger mLogdLogger{};

};

} // namespace

int main(int argc, char* argv[]) {

    InitLogging(argv, ServiceDispatcherLogger());

    if (!GetBoolProperty("ro.debuggable", false)) {

        LOG(ERROR) << "servicedispatcher is only allowed on debuggable builds.";

        return EX_NOPERM;

    }

    LOG(WARNING) << "WARNING: servicedispatcher is debug only. Use with caution.";

    uint32_t numThreads = 1;

    int opt;

    while (-1 != (opt = getopt(argc, argv, "n:"))) {

        switch (opt) {

            case 'n': {

                if (!ParseUint(optarg, &numThreads)) {

                    return Usage(argv[0]);

                }

            } break;

            default: {

                return Usage(argv[0]);

            }

        }

    }

    if (optind + 1 != argc) return Usage(argv[0]);

    auto name = argv[optind];

    return Dispatch(name, numThreads);

}