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YSFClients/YSFGateway/YSFNetwork.cpp

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/*
* Copyright (C) 2009-2014,2016,2017,2018,2020 by Jonathan Naylor G4KLX
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "YSFDefines.h"
#include "YSFNetwork.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
const unsigned int BUFFER_LENGTH = 200U;
CYSFNetwork::CYSFNetwork(const std::string& address, unsigned int port, const std::string& callsign, bool debug) :
m_socket(address, port),
m_debug(debug),
m_address(),
m_port(0U),
m_poll(NULL),
m_options(NULL),
m_opt(),
m_unlink(NULL),
m_buffer(1000U, "YSF Network Buffer"),
m_pollTimer(1000U, 5U),
m_name(),
m_linked(false)
{
m_poll = new unsigned char[14U];
::memcpy(m_poll + 0U, "YSFP", 4U);
m_unlink = new unsigned char[14U];
::memcpy(m_unlink + 0U, "YSFU", 4U);
m_options = new unsigned char[50U];
::memcpy(m_options + 0U, "YSFO", 4U);
std::string node = callsign;
node.resize(YSF_CALLSIGN_LENGTH, ' ');
for (unsigned int i = 0U; i < YSF_CALLSIGN_LENGTH; i++) {
m_poll[i + 4U] = node.at(i);
m_unlink[i + 4U] = node.at(i);
m_options[i + 4U] = node.at(i);
}
}
CYSFNetwork::CYSFNetwork(unsigned int port, const std::string& callsign, bool debug) :
m_socket(port),
m_debug(debug),
m_address(),
m_port(0U),
m_poll(NULL),
m_options(NULL),
m_opt(),
m_unlink(NULL),
m_buffer(1000U, "YSF Network Buffer"),
m_pollTimer(1000U, 5U)
{
m_poll = new unsigned char[14U];
::memcpy(m_poll + 0U, "YSFP", 4U);
m_unlink = new unsigned char[14U];
::memcpy(m_unlink + 0U, "YSFU", 4U);
m_options = new unsigned char[50U];
::memcpy(m_options + 0U, "YSFO", 4U);
std::string node = callsign;
node.resize(YSF_CALLSIGN_LENGTH, ' ');
for (unsigned int i = 0U; i < YSF_CALLSIGN_LENGTH; i++) {
m_poll[i + 4U] = node.at(i);
m_unlink[i + 4U] = node.at(i);
m_options[i + 4U] = node.at(i);
}
}
CYSFNetwork::~CYSFNetwork()
{
delete[] m_poll;
delete[] m_unlink;
delete[] m_options;
}
bool CYSFNetwork::open()
{
LogMessage("Opening YSF network connection");
return m_socket.open();
}
void CYSFNetwork::setDestination(const std::string& name, const in_addr& address, unsigned int port)
{
m_name = name;
m_address = address;
m_port = port;
m_linked = false;
}
void CYSFNetwork::clearDestination()
{
m_address.s_addr = INADDR_NONE;
m_port = 0U;
m_linked = false;
m_pollTimer.stop();
}
void CYSFNetwork::write(const unsigned char* data)
{
assert(data != NULL);
if (m_port == 0U)
return;
if (m_debug)
CUtils::dump(1U, "YSF Network Data Sent", data, 155U);
m_socket.write(data, 155U, m_address, m_port);
}
void CYSFNetwork::writePoll(unsigned int count)
{
if (m_port == 0U)
return;
m_pollTimer.start();
for (unsigned int i = 0U; i < count; i++)
m_socket.write(m_poll, 14U, m_address, m_port);
if (!m_opt.empty())
m_socket.write(m_options, 50U, m_address, m_port);
}
void CYSFNetwork::setOptions(const std::string& options)
{
if (options.empty()) {
m_opt.clear();
return;
}
m_opt = options;
m_opt.resize(50, ' ');
for (unsigned int i = 0U; i < (50U - 4U - YSF_CALLSIGN_LENGTH); i++)
m_options[i + 4U + YSF_CALLSIGN_LENGTH] = m_opt.at(i);
}
void CYSFNetwork::writeUnlink(unsigned int count)
{
m_pollTimer.stop();
if (m_port == 0U)
return;
for (unsigned int i = 0U; i < count; i++)
m_socket.write(m_unlink, 14U, m_address, m_port);
m_linked = false;
}
void CYSFNetwork::clock(unsigned int ms)
{
unsigned char buffer[BUFFER_LENGTH];
in_addr address;
unsigned int port;
m_pollTimer.clock(ms);
if (m_pollTimer.isRunning() && m_pollTimer.hasExpired())
writePoll();
int length = m_socket.read(buffer, BUFFER_LENGTH, address, port);
if (length <= 0)
return;
if (m_port == 0U)
return;
if (address.s_addr != m_address.s_addr || port != m_port)
return;
if (m_debug)
CUtils::dump(1U, "YSF Network Data Received", buffer, length);
// Throw away any options messages
if (::memcmp(buffer, "YSFO", 4U) == 0)
return;
// Throw away any info messages
if (::memcmp(buffer, "YSFI", 4U) == 0)
return;
if (::memcmp(buffer, "YSFP", 4U) == 0 && !m_linked) {
if (strcmp(m_name.c_str(),"MMDVM")== 0)
LogMessage("Link successful to %s", m_name.c_str());
else
LogMessage("Linked to %s", m_name.c_str());
m_linked = true;
if (!m_opt.empty())
m_socket.write(m_options, 50U, m_address, m_port);
}
unsigned char len = length;
m_buffer.addData(&len, 1U);
m_buffer.addData(buffer, length);
}
unsigned int CYSFNetwork::read(unsigned char* data)
{
assert(data != NULL);
if (m_buffer.isEmpty())
return 0U;
unsigned char len = 0U;
m_buffer.getData(&len, 1U);
m_buffer.getData(data, len);
return len;
}
void CYSFNetwork::close()
{
m_socket.close();
LogMessage("Closing YSF network connection");
}