NXDNClients/NXDNReflector/NXCoreNetwork.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 "NXCoreNetwork.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
const unsigned int BUFFER_LENGTH = 200U;
const unsigned int NXCORE_PORT = 41300U;
CNXCoreNetwork::CNXCoreNetwork(const std::string& address, bool debug) :
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m_socket(NXCORE_PORT),
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m_address(),
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m_debug(debug)
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{
assert(!address.empty());
m_address = CUDPSocket::lookup(address);
}
CNXCoreNetwork::~CNXCoreNetwork()
{
}
bool CNXCoreNetwork::open()
{
LogMessage("Opening NXCore network connection");
if (m_address.s_addr == INADDR_NONE)
return false;
return m_socket.open();
}
bool CNXCoreNetwork::write(const unsigned char* data, unsigned int len)
{
assert(data != NULL);
unsigned char buffer[110U];
::memset(buffer, 0x00U, 110U);
buffer[0U] = 'I';
buffer[1U] = 'C';
buffer[2U] = 'O';
buffer[3U] = 'M';
buffer[4U] = 0x01U;
buffer[5U] = 0x01U;
buffer[6U] = 0x08U;
buffer[7U] = 0xE0U;
if ((data[9U] & 0x02U) == 0x02U) {
buffer[37U] = 0x23U;
buffer[38U] = 0x02U;
buffer[39U] = 0x18U;
} else {
buffer[37U] = 0x23U;
buffer[38U] = (data[9U] & 0x0CU) != 0x00U ? 0x1CU : 0x10U;
buffer[39U] = 0x21U;
}
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::memcpy(buffer + 40U, data + 10U, 33U);
if (m_debug)
CUtils::dump(1U, "NXCore Network Data Sent", buffer, 102U);
return m_socket.write(buffer, 102U, m_address, NXCORE_PORT);
}
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unsigned int CNXCoreNetwork::read(unsigned char* data)
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{
unsigned char buffer[BUFFER_LENGTH];
in_addr address;
unsigned int port;
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int length = m_socket.read(buffer, BUFFER_LENGTH, address, port);
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if (length <= 0)
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return 0U;
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// Check if the data is for us
if (m_address.s_addr != address.s_addr || port != NXCORE_PORT) {
LogMessage("NXCore packet received from an invalid source, %08X != %08X and/or %u != %u", m_address.s_addr, address.s_addr, NXCORE_PORT, port);
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return 0U;
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}
// Invalid packet type?
if (::memcmp(buffer, "ICOM", 4U) != 0)
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return 0U;
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if (length != 102)
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return 0U;
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if (m_debug)
CUtils::dump(1U, "NXCore Network Data Received", buffer, length);
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::memcpy(data, buffer + 40U, 33U);
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return 33U;
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}
void CNXCoreNetwork::close()
{
m_socket.close();
LogMessage("Closing NXCore network connection");
}