MMDVM_CM/NXDN2DMR/NXDNNetwork.cpp

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2018-05-28 11:02:35 -04:00
/*
* Copyright (C) 2009-2014,2016,2017,2018 by Jonathan Naylor G4KLX
* Copyright (C) 2018 by Andy Uribe CA6JAU
*
* 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 "NXDNNetwork.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
const unsigned int BUFFER_LENGTH = 200U;
CNXDNNetwork::CNXDNNetwork(const std::string& address, unsigned int port, const std::string& callsign, bool debug) :
m_socket(address, port),
m_callsign(callsign),
m_debug(debug),
m_address(),
m_port(0U)
{
m_callsign.resize(10U, ' ');
}
CNXDNNetwork::~CNXDNNetwork()
{
}
bool CNXDNNetwork::open()
{
LogMessage("Opening NXDN network connection");
return m_socket.open();
}
void CNXDNNetwork::setDestination(const in_addr& address, unsigned int port)
{
m_address = address;
m_port = port;
}
void CNXDNNetwork::clearDestination()
{
m_address.s_addr = INADDR_NONE;
m_port = 0U;
}
bool CNXDNNetwork::write(const unsigned char* data, unsigned int length)
{
assert(data != NULL);
assert(length > 0U);
if (m_debug)
CUtils::dump(1U, "NXDN Network Data Sent", data, length);
return m_socket.write(data, length, m_address, m_port);
}
bool CNXDNNetwork::write(const unsigned char* data, unsigned short srcId, unsigned short dstId, bool grp)
{
assert(data != NULL);
unsigned char buffer[50U];
buffer[0U] = 'N';
buffer[1U] = 'X';
buffer[2U] = 'D';
buffer[3U] = 'N';
buffer[4U] = 'D';
buffer[5U] = (srcId >> 8) & 0xFFU;
buffer[6U] = (srcId >> 0) & 0xFFU;
buffer[7U] = (dstId >> 8) & 0xFFU;
buffer[8U] = (dstId >> 0) & 0xFFU;
buffer[9U] = 0x00U;
buffer[9U] |= grp ? 0x01U : 0x00U;
if (data[0U] == 0x81U || data[0U] == 0x83U) {
buffer[9U] |= data[5U] == 0x01U ? 0x04U : 0x00U;
buffer[9U] |= data[5U] == 0x08U ? 0x08U : 0x00U;
}
::memcpy(buffer + 10U, data, 33U);
if (m_debug)
CUtils::dump(1U, "NXDN Network Data Sent", buffer, 43U);
return m_socket.write(buffer, 43U, m_address, m_port);
}
unsigned int CNXDNNetwork::read(unsigned char* data)
{
assert(data != NULL);
in_addr address;
unsigned int port;
int len = m_socket.read(data, BUFFER_LENGTH, address, port);
if (len <= 0)
return 0U;
// Invalid packet type?
if (::memcmp(data, "NXDN", 4U) != 0)
return 0U;
if (len != 17 && len != 43)
return 0U;
if (m_debug)
CUtils::dump(1U, "NXDN Network Data Received", data, len);
return len;
}
bool CNXDNNetwork::writePoll(unsigned short tg)
{
unsigned char data[20U];
data[0U] = 'N';
data[1U] = 'X';
data[2U] = 'D';
data[3U] = 'N';
data[4U] = 'P';
for (unsigned int i = 0U; i < 10U; i++)
data[i + 5U] = m_callsign.at(i);
data[15U] = (tg >> 8) & 0xFFU;
data[16U] = (tg >> 0) & 0xFFU;
if (m_debug)
CUtils::dump(1U, "NXDN Network Poll Sent", data, 17U);
return m_socket.write(data, 17U, m_address, m_port);
}
bool CNXDNNetwork::writeUnlink(unsigned short tg)
{
unsigned char data[20U];
data[0U] = 'N';
data[1U] = 'X';
data[2U] = 'D';
data[3U] = 'N';
data[4U] = 'U';
for (unsigned int i = 0U; i < 10U; i++)
data[i + 5U] = m_callsign.at(i);
data[15U] = (tg >> 8) & 0xFFU;
data[16U] = (tg >> 0) & 0xFFU;
if (m_debug)
CUtils::dump(1U, "NXDN Network Unlink Sent", data, 17U);
return m_socket.write(data, 17U, m_address, m_port);
}
void CNXDNNetwork::close()
{
m_socket.close();
LogMessage("Closing NXDN network connection");
}