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/*
* Copyright (C) 2019 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 <android-base/logging.h>
#include <android/hardware/automotive/can/1.0/ICanBus.h>
#include <android/hardware/automotive/can/1.0/ICanMessageListener.h>
#include <android/hidl/manager/1.2/IServiceManager.h>
#include <hidl-utils/hidl-utils.h>
#include <linux/can.h>
#include <chrono>
#include <iomanip>
#include <iostream>
#include <string>
#include <thread>
namespace android::hardware::automotive::can {
using namespace std::chrono_literals;
using ICanBus = V1_0::ICanBus;
using Result = V1_0::Result;
struct CanMessageListener : public V1_0::ICanMessageListener {
const std::string name;
CanMessageListener(std::string name) : name(name) {}
virtual Return<void> onReceive(const V1_0::CanMessage& message) {
int msgIdWidth = 3;
if (message.isExtendedId) msgIdWidth = 8;
std::cout << " " << name << " " << std::hex << std::uppercase << std::setw(msgIdWidth)
<< std::setfill('0') << message.id << std::setw(0);
std::cout << " [" << message.payload.size() << "] ";
if (message.remoteTransmissionRequest) {
std::cout << "remote request";
} else {
for (const auto byte : message.payload) {
std::cout << " " << std::setfill('0') << std::setw(2) << unsigned(byte);
}
}
std::cout << std::nouppercase << std::dec << std::endl;
return {};
}
virtual Return<void> onError(V1_0::ErrorEvent error) {
std::cout << " " << name << " " << toString(error) << std::endl;
return {};
}
};
static void usage() {
std::cerr << "canhaldump - dump CAN bus traffic" << std::endl;
std::cerr << std::endl << "usage:" << std::endl << std::endl;
std::cerr << "canhaldump <bus name>" << std::endl;
std::cerr << "where:" << std::endl;
std::cerr << " bus name - name under which ICanBus is be published" << std::endl;
}
// TODO(b/135918744): extract to a new library
static sp<ICanBus> tryOpen(const std::string& busname) {
auto bus = ICanBus::tryGetService(busname);
if (bus != nullptr) return bus;
/* Fallback for interfaces not registered in manifest. For testing purposes only,
* one should not depend on this in production deployment. */
auto manager = hidl::manager::V1_2::IServiceManager::getService();
auto ret = manager->get(ICanBus::descriptor, busname).withDefault(nullptr);
if (ret == nullptr) return nullptr;
std::cerr << "WARNING: bus " << busname << " is not registered in device manifest, "
<< "trying to fetch it directly..." << std::endl;
return ICanBus::castFrom(ret);
}
static int candump(const std::string& busname) {
auto bus = tryOpen(busname);
if (bus == nullptr) {
std::cerr << "Bus " << busname << " is not available" << std::endl;
return -1;
}
Result result;
sp<V1_0::ICloseHandle> chnd;
// TODO(b/135918744): extract to library
bus->listen({}, new CanMessageListener(busname), hidl_utils::fill(&result, &chnd)).assertOk();
if (result != Result::OK) {
std::cerr << "Listen call failed: " << toString(result) << std::endl;
return -1;
}
while (true) std::this_thread::sleep_for(1h);
}
static int main(int argc, char* argv[]) {
base::SetDefaultTag("CanHalDump");
base::SetMinimumLogSeverity(android::base::VERBOSE);
if (argc == 0) {
usage();
return 0;
}
if (argc != 1) {
std::cerr << "Invalid number of arguments" << std::endl;
usage();
return -1;
}
return candump(argv[0]);
}
} // namespace android::hardware::automotive::can
int main(int argc, char* argv[]) {
if (argc < 1) return -1;
return ::android::hardware::automotive::can::main(--argc, ++argv);
}
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