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/*
RailControl - Model Railway Control Software
Copyright (c) 2017-2025 by Teddy / Dominik Mahrer - www.railcontrol.org
RailControl is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 3, or (at your option) any
later version.
RailControl is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with RailControl; see the file LICENCE. If not see
<http://www.gnu.org/licenses/>.
*/
#include <arpa/inet.h>
#include <cstring> //memset
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <unistd.h>
#include <iostream>
#include "Network/Select.h"
#include "Network/UdpClient.h"
#include "Network/UdpServer.h"
#include "Utils/Utils.h"
namespace Network
{
UdpServer::UdpServer(const std::string& address,
const unsigned short port,
const std::string& threadName)
: logger(Logger::Logger::GetLogger(threadName)),
run(false),
error(""),
address(address),
port(port),
serverSocket(0),
threadName(threadName)
{
}
UdpServer::~UdpServer()
{
TerminateUdpServer();
}
void UdpServer::StartUdpServer()
{
if (run)
{
return;
}
run = true;
struct sockaddr_in6 serverAddr6;
memset(reinterpret_cast<char*>(&serverAddr6), 0, sizeof(serverAddr6));
serverAddr6.sin6_family = AF_INET6;
if (address.compare("localhost") == 0)
{
serverAddr6.sin6_addr = IN6ADDR_LOOPBACK_INIT;
}
else
{
serverAddr6.sin6_addr = in6addr_any;
}
serverAddr6.sin6_port = htons(port);
SocketCreateBindListen(serverAddr6.sin6_family, reinterpret_cast<struct sockaddr*>(&serverAddr6));
#ifdef __CYGWIN__
struct sockaddr_in serverAddr4;
memset(reinterpret_cast<char*>(&serverAddr4), 0, sizeof(serverAddr4));
serverAddr4.sin_family = AF_INET;
if (address.compare("localhost") == 0)
{
serverAddr4.sin_addr.s_addr = inet_addr("127.0.0.1");
}
else
{
serverAddr4.sin_addr.s_addr = htonl(INADDR_ANY);
}
serverAddr4.sin_port = htons(port);
SocketCreateBindListen(serverAddr4.sin_family, reinterpret_cast<struct sockaddr*>(&serverAddr4));
#endif
}
void UdpServer::SocketCreateBindListen(int family, struct sockaddr* address)
{
serverSocket = socket(family, SOCK_DGRAM, 0);
if (serverSocket < 0)
{
error = "Unable to create socket for udp server. Unable to serve clients.";
return;
}
int on = 1;
int intResult = setsockopt(serverSocket, SOL_SOCKET, SO_REUSEADDR, (const void*) &on, sizeof(on));
if (intResult < 0)
{
error = "Unable to set tcp server socket option SO_REUSEADDR.";
close(serverSocket);
return;
}
intResult = bind(serverSocket, address, family == AF_INET ? sizeof(struct sockaddr_in) : sizeof(struct sockaddr_in6));
if (intResult < 0)
{
error = "Unable to bind socket for udp server to port. Unable to serve clients.";
close (serverSocket);
return;
}
if (!run)
{
close(serverSocket);
return;
}
serverThreads.push_back(std::thread(&Network::UdpServer::Worker, this));
}
void UdpServer::TerminateUdpServer()
{
run = false;
while (serverThreads.size())
{
std::thread& serverThread = serverThreads.back();
serverThread.join();
serverThreads.pop_back();
}
for (auto client : clients)
{
delete client;
}
clients.clear();
}
void UdpServer::Worker()
{
Utils::Utils::SetThreadName(threadName);
fd_set set;
struct timeval tv;
struct sockaddr_storage clientAddress;
socklen_t clientAddressLength = sizeof(clientAddress);
while (run == true)
{
// wait for data and abort on shutdown
int ret;
do
{
FD_ZERO(&set);
FD_SET(serverSocket, &set);
tv.tv_sec = 1;
tv.tv_usec = 0;
ret = TEMP_FAILURE_RETRY(select(FD_SETSIZE, &set, NULL, NULL, &tv));
if (run == false)
{
return;
}
} while (ret == 0);
if (ret < 0)
{
continue;
}
unsigned char buffer[1472]; // 1472 = Max UDP data size
memset(reinterpret_cast<char*>(&clientAddress), 0, sizeof(clientAddressLength));
ssize_t size = recvfrom(serverSocket, buffer, sizeof(buffer), 0, reinterpret_cast<struct sockaddr*>(&clientAddress), &clientAddressLength);
UdpClient* client = GetClient(&clientAddress);
client->Work(buffer, size);
CleanUpClients();
}
}
UdpClient* UdpServer::GetClient(const struct sockaddr_storage* clientAddress)
{
for (auto client : clients)
{
if (client->IsClient(clientAddress))
{
client->Update();
return client;
}
}
UdpClient* newClient = UdpClientFactory(serverSocket, clientAddress);
clients.push_back(newClient);
return newClient;
}
void UdpServer::CleanUpClients()
{
for (std::vector<UdpClient*>::iterator it = clients.begin(); it != clients.end();)
{
UdpClient* client = *it;
if (client->Terminated() || client->TimedOut())
{
clients.erase(it);
delete client;
}
else
{
++it;
}
}
}
}
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