NXDNClients/NXDNReflector/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 "NXDNNetwork.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
CNXDNNetwork::CNXDNNetwork(unsigned int port, bool debug) :
m_socket(port),
m_debug(debug)
{
}
CNXDNNetwork::~CNXDNNetwork()
{
}
bool CNXDNNetwork::open()
{
LogInfo("Opening NXDN network connection");
return m_socket.open();
}
bool CNXDNNetwork::write(const unsigned char* data, unsigned int length, const in_addr& address, unsigned int port)
{
assert(data != NULL);
assert(length > 0U);
assert(port > 0U);
if (m_debug)
CUtils::dump(1U, "NXDN Network Data Sent", data, length);
return m_socket.write(data, length, address, port);
}
bool CNXDNNetwork::write(const unsigned char* data, unsigned int length, unsigned short srcId, unsigned short dstId, bool grp, const in_addr& address, unsigned int port)
{
assert(data != NULL);
assert(length > 0U);
assert(port > 0U);
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) {
// This is a voice header or trailer.
buffer[9U] |= data[5U] == 0x01U ? 0x04U : 0x00U;
buffer[9U] |= data[5U] == 0x08U ? 0x08U : 0x00U;
} else if ((data[0U] & 0xF0U) == 0x90U) {
// This if data.
buffer[9U] |= 0x02U;
if (data[0U] == 0x90U || data[0U] == 0x92U || data[0U] == 0x9CU || data[0U] == 0x9EU) {
// This is data header or trailer.
buffer[9U] |= data[2U] == 0x09U ? 0x04U : 0x00U;
buffer[9U] |= data[2U] == 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, address, port);
}
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unsigned int CNXDNNetwork::read(unsigned char* data, unsigned int length, in_addr& address, unsigned int& port)
{
assert(data != NULL);
assert(length > 0U);
int len = m_socket.read(data, length, address, port);
if (len <= 0)
return 0U;
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// Invalid packet type?
if (::memcmp(data, "NXDN", 4U) != 0)
return 0U;
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if (len != 17 && len != 43)
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return 0U;
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if (m_debug)
CUtils::dump(1U, "NXDN Network Data Received", data, len);
return len;
}
void CNXDNNetwork::close()
{
m_socket.close();
LogInfo("Closing NXDN network connection");
}