MMDVMHost-Private/NXDNNetwork.cpp

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/*
* Copyright (C) 2009-2014,2016,2018 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 "NXDNDefines.h"
#include "NXDNNetwork.h"
#include "Defines.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
const unsigned int BUFFER_LENGTH = 200U;
CNXDNNetwork::CNXDNNetwork(const std::string& myAddress, unsigned int myPort, const std::string& gatewayAddress, unsigned int gatewayPort, const std::string& callsign, bool debug) :
m_socket(myAddress, myPort),
m_address(),
m_port(gatewayPort),
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m_callsign(callsign),
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m_debug(debug),
m_enabled(false),
m_buffer(1000U, "NXDN Network"),
m_pollTimer(1000U, 5U)
{
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m_callsign.resize(10U, ' ');
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m_address = CUDPSocket::lookup(gatewayAddress);
}
CNXDNNetwork::~CNXDNNetwork()
{
}
bool CNXDNNetwork::open()
{
LogMessage("Opening NXDN network connection");
if (m_address.s_addr == INADDR_NONE)
return false;
m_pollTimer.start();
return m_socket.open();
}
bool CNXDNNetwork::write(const unsigned char* data, unsigned short src, bool grp, unsigned short dst, bool dat, unsigned char cnt, bool end)
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{
assert(data != NULL);
unsigned char buffer[100U];
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buffer[0U] = 'N';
buffer[1U] = 'X';
buffer[2U] = 'D';
buffer[3U] = 'N';
buffer[4U] = 'D';
buffer[5U] = (src >> 8) & 0xFFU;
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buffer[6U] = (src >> 0) & 0xFFU;
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buffer[7U] = grp ? 0x01U : 0x00U;
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buffer[7U] |= dat ? 0x02U : 0x00U;
buffer[7U] |= end ? 0x04U : 0x00U;
buffer[8U] = (dst >> 8) & 0xFFU;
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buffer[9U] = (dst >> 0) & 0xFFU;
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buffer[10U] = cnt;
::memcpy(buffer + 11U, data, NXDN_FRAME_LENGTH_BYTES);
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if (m_debug)
CUtils::dump(1U, "NXDN Network Data Sent", buffer, 59U);
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return m_socket.write(buffer, 59U, m_address, m_port);
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}
bool CNXDNNetwork::writePoll()
{
unsigned char buffer[20U];
buffer[0U] = 'N';
buffer[1U] = 'X';
buffer[2U] = 'D';
buffer[3U] = 'N';
buffer[4U] = 'P';
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for (unsigned int i = 0U; i < 10U; i++)
buffer[5U + i] = m_callsign.at(i);
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if (m_debug)
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CUtils::dump(1U, "NXDN Network Poll Sent", buffer, 15U);
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return m_socket.write(buffer, 15U, m_address, m_port);
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}
void CNXDNNetwork::clock(unsigned int ms)
{
m_pollTimer.clock(ms);
if (m_pollTimer.hasExpired()) {
writePoll();
m_pollTimer.start();
}
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;
// Check if the data is for us
if (m_address.s_addr != address.s_addr || m_port != port) {
LogMessage("NXDN packet received from an invalid source, %08X != %08X and/or %u != %u", m_address.s_addr, address.s_addr, m_port, port);
return;
}
// Ignore incoming polls
if (::memcmp(buffer, "NXDNP", 5U) == 0)
return;
// Invalid packet type?
if (::memcmp(buffer, "NXDND", 5U) != 0)
return;
if (!m_enabled)
return;
if (m_debug)
CUtils::dump(1U, "NXDN Network Data Received", buffer, length);
m_buffer.addData(buffer, 59U);
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}
unsigned int CNXDNNetwork::read(unsigned char* data, unsigned short& src, bool& grp, unsigned short& dst, bool& dat, unsigned char& cnt, bool& end)
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{
assert(data != NULL);
if (m_buffer.isEmpty())
return 0U;
unsigned char buffer[100U];
m_buffer.getData(buffer, 59U);
src = (buffer[5U] << 8) + buffer[6U];
grp = (buffer[7U] & 0x01U) == 0x01U;
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dat = (buffer[7U] & 0x02U) == 0x02U;
end = (buffer[7U] & 0x04U) == 0x04U;
dst = (buffer[8U] << 8) + buffer[9U];
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cnt = buffer[10U];
::memcpy(data, buffer + 11U, NXDN_FRAME_LENGTH_BYTES);
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return NXDN_FRAME_LENGTH_BYTES;
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}
void CNXDNNetwork::reset()
{
}
void CNXDNNetwork::close()
{
m_socket.close();
LogMessage("Closing NXDN network connection");
}
void CNXDNNetwork::enable(bool enabled)
{
if (enabled && !m_enabled)
reset();
m_enabled = enabled;
}