YSFClients/YSFReflector/Network.cpp

/*
 *   Copyright (C) 2009-2014,2016 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 "Network.h"
#include "Utils.h"

#include <cstdio>
#include <cassert>
#include <cstring>

const unsigned int BUFFER_LENGTH = 200U;

CNetwork::CNetwork(unsigned int port, const std::string& name, const std::string& description, bool debug) :
m_socket(port),
m_name(name),
m_description(description),
m_address(),
m_port(0U),
m_callsign(),
m_debug(debug),
m_buffer(1000U, "YSF Network"),
m_status(NULL)
{
	m_name.resize(16U, ' ');
	m_description.resize(14U, ' ');

	m_status = new unsigned char[50U];
}

CNetwork::~CNetwork()
{
	delete[] m_status;
}

bool CNetwork::open()
{
	::fprintf(stdout, "Opening YSF network connection\n");

	return m_socket.open();
}

bool CNetwork::writeData(const unsigned char* data, const in_addr& address, unsigned int port)
{
	assert(data != NULL);

	if (m_debug)
		CUtils::dump(1U, "YSF Network Data Sent", data, 155U);

	return m_socket.write(data, 155U, address, port);
}

bool CNetwork::writePoll(const in_addr& address, unsigned int port)
{
	unsigned char buffer[20U];

	buffer[0] = 'Y';
	buffer[1] = 'S';
	buffer[2] = 'F';
	buffer[3] = 'P';

	buffer[4U]  = 'R';
	buffer[5U]  = 'E';
	buffer[6U]  = 'F';
	buffer[7U]  = 'L';
	buffer[8U]  = 'E';
	buffer[9U]  = 'C';
	buffer[10U] = 'T';
	buffer[11U] = 'O';
	buffer[12U] = 'R';
	buffer[13U] = ' ';

	if (m_debug)
		CUtils::dump(1U, "YSF Network Poll Sent", buffer, 14U);

	return m_socket.write(buffer, 14U, address, port);
}

void CNetwork::clock(unsigned int ms)
{
	unsigned char buffer[BUFFER_LENGTH];

	in_addr address;
	unsigned int port;
	int length = m_socket.read(buffer, BUFFER_LENGTH, address, port);
	if (length <= 0)
		return;

	// Handle incoming polls
	if (::memcmp(buffer, "YSFP", 4U) == 0) {
		m_callsign = std::string((char*)(buffer + 4U), YSF_CALLSIGN_LENGTH);
		m_address  = address;
		m_port     = port;
		return;
	}

	// Handle incoming status requests
	if (::memcmp(buffer, "YSFS", 4U) == 0) {
		m_socket.write(m_status, 42U, address, port);
		return;
	}

	if (m_debug)
		CUtils::dump(1U, "YSF Network Data Received", buffer, length);

	unsigned char len = length;
	m_buffer.addData(&len, 1U);

	m_buffer.addData(buffer, length);
}

unsigned int CNetwork::readData(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;
}

bool CNetwork::readPoll(std::string& callsign, in_addr& address, unsigned int& port)
{
	if (m_port == 0U)
		return false;

	callsign = m_callsign;
	address  = m_address;
	port     = m_port;

	m_port = 0U;

	return true;
}

void CNetwork::setCount(unsigned int count)
{
	if (count > 999U)
		count = 999U;

	unsigned int hash = 0U;

	for (unsigned int i = 0U; i < m_name.size(); i++) {
		hash += m_name.at(i);
		hash += (hash << 10);
		hash ^= (hash >> 6);
	}

	// Final avalanche
	hash += (hash << 3);
	hash ^= (hash >> 11);
	hash += (hash << 15);

	::sprintf((char*)m_status, "YSFS%05u%16.16s%14.14s%03u", hash % 100000U, m_name.c_str(), m_description.c_str(), count);
}

void CNetwork::close()
{
	m_socket.close();

	::fprintf(stdout, "Closing YSF network connection\n");
}