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/*
*
* Copyright (C) 2023 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/strings.h>
#include <gflags/gflags.h>
#include <grpcpp/ext/proto_server_reflection_plugin.h>
#include <grpcpp/grpcpp.h>
#include <grpcpp/health_check_service_interface.h>
#include <sys/msg.h>
#include <unistd.h>
#include <algorithm>
#include <array>
#include <iostream>
#include <memory>
#include <string>
#include "wmediumd.grpc.pb.h"
#include "wmediumd/api.h"
#include "wmediumd/grpc.h"
using google::protobuf::Empty;
using grpc::Server;
using grpc::ServerBuilder;
using grpc::ServerContext;
using grpc::Status;
using grpc::StatusCode;
using wmediumdserver::SetPositionRequest;
using wmediumdserver::WmediumdService;
#define MAC_ADDR_LEN 6
#define STR_MAC_ADDR_LEN 17
template <class T>
static void AppendBinaryRepresentation(std::string& buf, const T& data) {
std::copy(reinterpret_cast<const char*>(&data),
reinterpret_cast<const char*>(&data) + sizeof(T),
std::back_inserter(buf));
}
bool IsValidMacAddr(const std::string& mac_address) {
if (mac_address.size() != STR_MAC_ADDR_LEN) {
return false;
}
if (mac_address[2] != ':' || mac_address[5] != ':' || mac_address[8] != ':' ||
mac_address[11] != ':' || mac_address[14] != ':') {
return false;
}
for (int i = 0; i < STR_MAC_ADDR_LEN; ++i) {
if ((i - 2) % 3 == 0) continue;
char c = mac_address[i];
if (isupper(c)) {
c = tolower(c);
}
if ((c < '0' || c > '9') && (c < 'a' || c > 'f')) return false;
}
return true;
}
static std::array<uint8_t, 6> ParseMacAddress(const std::string& mac_address) {
auto split_mac = android::base::Split(mac_address, ":");
std::array<uint8_t, 6> mac;
for (int i = 0; i < 6; i++) {
char* end_ptr;
mac[i] = (uint8_t)strtol(split_mac[i].c_str(), &end_ptr, 16);
}
return mac;
}
class WmediumdServiceImpl final : public WmediumdService::Service {
public:
WmediumdServiceImpl(int event_fd, int msq_id)
: event_fd_(event_fd), msq_id_(msq_id) {}
Status SetPosition(ServerContext* context, const SetPositionRequest* request,
Empty* reply) override {
// Validate parameters
if (!IsValidMacAddr(request->mac_address())) {
return Status(StatusCode::INVALID_ARGUMENT, "Got invalid mac address");
}
auto mac = ParseMacAddress(request->mac_address());
// Construct request data
struct wmediumd_set_position data;
memcpy(data.mac, &mac, sizeof(mac));
data.x = request->x_pos();
data.y = request->y_pos();
// Fill data in the message queue
struct wmediumd_grpc_message msg;
msg.type = GRPC_REQUEST;
memcpy(msg.data, &data, sizeof(data));
msgsnd(msq_id_, &msg, sizeof(data), 0);
// Throw an event to wmediumd
uint64_t value = REQUEST_SET_POSITION;
write(event_fd_, &value, sizeof(uint64_t));
return Status::OK;
}
private:
int event_fd_;
int msq_id_;
};
void RunWmediumdServer(std::string grpc_uds_path, int event_fd, int msq_id) {
std::string server_address("unix:" + grpc_uds_path);
WmediumdServiceImpl service(event_fd, msq_id);
grpc::EnableDefaultHealthCheckService(true);
grpc::reflection::InitProtoReflectionServerBuilderPlugin();
ServerBuilder builder;
// Listen on the given address without any authentication mechanism.
builder.AddListeningPort(server_address, grpc::InsecureServerCredentials());
// Register "service" as the instance through which we'll communicate with
// clients. In this case it corresponds to an *synchronous* service.
builder.RegisterService(&service);
// Finally assemble the server.
std::unique_ptr<Server> server(builder.BuildAndStart());
std::cout << "Server listening on " << server_address << std::endl;
// Wait for the server to shutdown. Note that some other thread must be
// responsible for shutting down the server for this call to ever return.
server->Wait();
}
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