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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 <unistd.h> // close & TEMP_FAILURE_RETRY;
#include "Network/Select.h"
#include "Network/UdpConnection.h"
#include "Utils/Utils.h"
namespace Network
{
UdpConnection::UdpConnection(Logger::Logger* logger,
const std::string& server,
const unsigned short port)
: logger(logger),
connected(false),
server(server),
port(port)
{
memset((char*)&sockaddr, 0, sizeof(sockaddr));
struct sockaddr_in* sockaddr_in = reinterpret_cast<struct sockaddr_in*>(&sockaddr);
sockaddr_in->sin_family = AF_INET;
sockaddr_in->sin_port = htons(port);
int ok = inet_pton(AF_INET, server.c_str(), &sockaddr_in->sin_addr);
if (ok <= 0)
{
logger->Error(Languages::TextUnableToResolveAddress, server);
return;
}
CreateUdpSocket();
}
UdpConnection::UdpConnection(Logger::Logger* logger,
struct sockaddr* sockaddr)
: logger(logger),
connected(false),
sockaddr(*sockaddr)
{
const struct sockaddr_in* sockaddr_in = reinterpret_cast<const struct sockaddr_in*>(&(this->sockaddr));
char serverC[20];
inet_ntop(AF_INET, &sockaddr_in->sin_addr, serverC, sizeof(serverC));
server = serverC;
port = ntohs(sockaddr_in->sin_port);
CreateUdpSocket();
}
void UdpConnection::CreateUdpSocket()
{
// create socket
connectionSocket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (connectionSocket == -1)
{
logger->Error(Languages::TextUnableToCreateUdpSocket, server, port);
return;
}
// setting receive timeout to 1s
struct timeval tv;
tv.tv_sec = 1;
tv.tv_usec = 0;
setsockopt(connectionSocket, SOL_SOCKET, SO_RCVTIMEO, (const char*) &tv, sizeof(struct timeval));
connected = true;
}
bool UdpConnection::Bind()
{
int ret = bind(connectionSocket, &sockaddr, sizeof(sockaddr));
if (ret == 0)
{
return true;
}
logger->Error(Languages::TextUnableToBindSocketToPort, port);
connected = false;
close(connectionSocket);
return false;
}
void UdpConnection::Terminate()
{
if (connected)
{
connected = false;
close(connectionSocket);
}
}
int UdpConnection::Send(const char* buffer, const size_t bufferLength)
{
if (!connected)
{
logger->Error(Languages::TextConnectionReset);
errno = ECONNRESET;
return -1;
}
return sendto(connectionSocket, buffer, bufferLength, 0, &sockaddr, sizeof(sockaddr));
}
int UdpConnection::Receive(char* buffer, const size_t bufferLength)
{
if (!connected)
{
logger->Error(Languages::TextConnectionReset);
errno = ECONNRESET;
return -1;
}
ssize_t ret;
do
{
if (!connected)
{
return 0;
}
ret = recvfrom(connectionSocket, buffer, bufferLength, 0, NULL, NULL);
} while(ret < 0 && errno == EAGAIN);
return ret;
}
}
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