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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 <unistd.h> // close & TEMP_FAILURE_RETRY;
#include "Network/Select.h"
#include "Network/TcpConnection.h"
#include "Utils/Utils.h"
#ifndef MSG_NOSIGNAL
#define MSG_NOSIGNAL 0
#endif
namespace Network
{
void TcpConnection::Terminate() const
{
if (connected)
{
connected = false;
close(connectionSocket);
}
}
int TcpConnection::Send(const unsigned char* buffer, const size_t bufferLength, const int flags) const
{
if (connectionSocket == 0 || connected == false)
{
errno = ENOTCONN;
return -1;
}
errno = 0;
fd_set set;
FD_ZERO(&set);
FD_SET(connectionSocket, &set);
struct timeval timeout;
timeout.tv_sec = 5;
timeout.tv_usec = 0;
int ret = TEMP_FAILURE_RETRY(select(FD_SETSIZE, NULL, &set, NULL, &timeout));
if (ret < 0)
{
return ret;
}
if (ret == 0)
{
errno = ETIMEDOUT;
return -1;
}
ret = send(connectionSocket, buffer, bufferLength, flags | MSG_NOSIGNAL);
if (ret <= 0)
{
errno = ECONNRESET;
Terminate();
return -1;
}
return ret;
}
int TcpConnection::Receive(unsigned char* buffer, const size_t bufferLength, const int flags) const
{
if (connectionSocket == 0 || connected == false)
{
errno = ENOTCONN;
return -1;
}
errno = 0;
fd_set set;
FD_ZERO(&set);
FD_SET(connectionSocket, &set);
struct timeval timeout;
timeout.tv_sec = 1;
timeout.tv_usec = 0;
int ret = TEMP_FAILURE_RETRY(select(FD_SETSIZE, &set, NULL, NULL, &timeout));
if (ret < 0)
{
return ret;
}
if (ret == 0)
{
errno = ETIMEDOUT;
return -1;
}
ret = recv(connectionSocket, buffer, bufferLength, flags);
if (ret <= 0)
{
errno = ECONNRESET;
Terminate();
return -1;
}
return ret;
}
bool TcpConnection::Receive(std::string& data, const size_t maxData, const int flags)
{
const size_t dataBufferSize = 1024;
unsigned char dataBuffer[dataBufferSize];
const size_t max = maxData > dataBufferSize ? dataBufferSize : maxData;
ssize_t ret = Receive(dataBuffer, max, flags);
if (ret <= 0)
{
return false;
}
data.append(reinterpret_cast<char*>(dataBuffer), ret);
return true;
}
int TcpConnection::ReceiveExact(unsigned char* data, const size_t length, const int flags) const
{
int actualSize = 0;
int endSize = length;
while (actualSize < endSize)
{
int ret = Receive(data + actualSize, endSize - actualSize, flags);
if (ret <= 0)
{
return actualSize;
}
actualSize += ret;
}
return actualSize;
}
}
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