MMDVMHost-Private/NXDNNetwork.cpp

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/*
* Copyright (C) 2009-2014,2016,2018,2019 by Jonathan Naylor G4KLX
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*
* 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& localAddress, unsigned int localPort, const std::string& gatewayAddress, unsigned int gatewayPort, bool debug) :
m_socket(localAddress, localPort),
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m_address(),
m_port(gatewayPort),
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m_debug(debug),
m_enabled(false),
m_buffer(1000U, "NXDN Network")
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{
assert(gatewayPort > 0U);
assert(!gatewayAddress.empty());
m_address = CUDPSocket::lookup(gatewayAddress);
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}
CNXDNNetwork::~CNXDNNetwork()
{
}
bool CNXDNNetwork::open()
{
LogMessage("Opening NXDN network connection");
if (m_address.s_addr == INADDR_NONE)
return false;
return m_socket.open();
}
bool CNXDNNetwork::write(const unsigned char* data, NXDN_NETWORK_MESSAGE_TYPE type)
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{
assert(data != NULL);
unsigned char buffer[110U];
::memset(buffer, 0x00U, 110U);
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buffer[0U] = 'I';
buffer[1U] = 'C';
buffer[2U] = 'O';
buffer[3U] = 'M';
buffer[4U] = 0x01U;
buffer[5U] = 0x01U;
buffer[6U] = 0x08U;
buffer[7U] = 0xE0U;
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switch (type) {
case NNMT_VOICE_HEADER:
case NNMT_VOICE_TRAILER:
buffer[37U] = 0x23U;
buffer[38U] = 0x1CU;
buffer[39U] = 0x21U;
break;
case NNMT_VOICE_BODY:
buffer[37U] = 0x23U;
buffer[38U] = 0x10U;
buffer[39U] = 0x21U;
break;
case NNMT_DATA_HEADER:
case NNMT_DATA_BODY:
case NNMT_DATA_TRAILER:
buffer[37U] = 0x23U;
buffer[38U] = 0x02U;
buffer[39U] = 0x18U;
break;
default:
return false;
}
::memcpy(buffer + 40U, data, 33U);
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if (m_debug)
CUtils::dump(1U, "NXDN Network Data Sent", buffer, 102U);
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return m_socket.write(buffer, 102U, m_address, m_port);
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}
void CNXDNNetwork::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;
// Check if the data is for us
if (m_address.s_addr != address.s_addr || port != m_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);
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return;
}
// Invalid packet type?
if (::memcmp(buffer, "ICOM", 4U) != 0)
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return;
if (length != 102)
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return;
if (!m_enabled)
return;
if (m_debug)
CUtils::dump(1U, "NXDN Network Data Received", buffer, length);
m_buffer.addData(buffer + 40U, 33U);
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}
bool CNXDNNetwork::read(unsigned char* data)
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{
assert(data != NULL);
if (m_buffer.isEmpty())
return false;
m_buffer.getData(data, 33U);
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return true;
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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();
else if (!enabled && m_enabled)
m_buffer.clear();
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m_enabled = enabled;
}