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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 <fcntl.h>
#include <netinet/in.h>
#include <string.h>
#include "Network/Select.h"
#include "Network/TcpClient.h"
namespace Network
{
TcpConnection TcpClient::GetTcpClientConnection(Logger::Logger* logger, const std::string& host, const unsigned short port)
{
struct sockaddr_storage address;
struct sockaddr_in* addressPointer = reinterpret_cast<struct sockaddr_in*>(&address);
addressPointer->sin_family = AF_INET;
addressPointer->sin_port = htons(port);
int ok = inet_pton(AF_INET, host.c_str(), &(addressPointer->sin_addr));
if (ok <= 0)
{
logger->Error(Languages::TextUnableToResolveAddress, host);
return TcpConnection(0);
}
int sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock < 0)
{
logger->Error(Languages::TextUnableToCreateTcpSocket, host, port);
return TcpConnection(0);
}
ok = ConnectWithTimeout(sock, reinterpret_cast<struct sockaddr*>(addressPointer), sizeof(address));
if (ok < 0)
{
Languages::TextSelector text;
switch (errno)
{
case ECONNREFUSED:
text = Languages::TextConnectionRefused;
break;
case ENETUNREACH:
text = Languages::TextNetworkUnreachable;
break;
default:
text = Languages::TextConnectionFailed;
}
logger->Error(text, host, port);
close(sock);
return TcpConnection(0);
}
return TcpConnection(sock, &address);
}
int TcpClient::ConnectWithTimeout(int sock, struct sockaddr *addr, socklen_t length)
{
// Set non-blocking
long arg = fcntl(sock, F_GETFL, nullptr);
if (arg < 0)
{
return -1;
}
arg |= O_NONBLOCK;
if (fcntl(sock, F_SETFL, arg) < 0)
{
return -1;
}
// Trying to connect with timeout
int ret = connect(sock, addr, length);
if (ret < 0)
{
if (errno != EINPROGRESS)
{
return -1;
}
while (true)
{
fd_set myset;
int valopt;
socklen_t lon;
struct timeval tv;
tv.tv_sec = 3;
tv.tv_usec = 0;
FD_ZERO(&myset);
FD_SET(sock, &myset);
ret = TEMP_FAILURE_RETRY(select(sock + 1, nullptr, &myset, nullptr, &tv));
if (ret < 0 && errno == EINTR)
{
continue;
}
if (ret <= 0)
{
return -1;
}
// Socket selected for write
lon = sizeof(int);
if (getsockopt(sock, SOL_SOCKET, SO_ERROR, (void*) (&valopt), &lon) < 0)
{
return -1;
}
// Check the value returned...
if (valopt)
{
return -1;
}
break;
}
}
// Set to blocking mode again...
if ((arg = fcntl(sock, F_GETFL, nullptr)) < 0)
{
return -1;
}
arg &= (~O_NONBLOCK);
if (fcntl(sock, F_SETFL, arg) < 0)
{
return -1;
}
return ret;
}
}
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