167 lines
3.6 KiB
C++
167 lines
3.6 KiB
C++
/*
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* Copyright (C) 2009-2014,2016,2018 by Jonathan Naylor G4KLX
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "NXDNDefines.h"
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#include "NXDNNetwork.h"
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#include "Defines.h"
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#include "Utils.h"
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#include "Log.h"
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#include <cstdio>
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#include <cassert>
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#include <cstring>
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const unsigned int BUFFER_LENGTH = 200U;
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CNXDNNetwork::CNXDNNetwork(const std::string& myAddress, unsigned int myPort, const std::string& gatewayAddress, unsigned int gatewayPort, const std::string& callsign, bool debug) :
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m_socket(myAddress, myPort),
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m_address(),
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m_port(gatewayPort),
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m_debug(debug),
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m_enabled(false),
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m_buffer(1000U, "NXDN Network"),
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m_pollTimer(1000U, 5U)
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{
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m_address = CUDPSocket::lookup(gatewayAddress);
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}
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CNXDNNetwork::~CNXDNNetwork()
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{
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}
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bool CNXDNNetwork::open()
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{
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LogMessage("Opening NXDN network connection");
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if (m_address.s_addr == INADDR_NONE)
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return false;
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m_pollTimer.start();
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return m_socket.open();
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}
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bool CNXDNNetwork::write(const unsigned char* data, unsigned int count, bool end)
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{
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assert(data != NULL);
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unsigned char buffer[200U];
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buffer[0U] = 'N';
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buffer[1U] = 'X';
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buffer[2U] = 'D';
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buffer[3U] = 'N';
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buffer[4U] = 'D';
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buffer[5U] = end ? 0x01U : 0x00U;
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buffer[5U] |= (count & 0x7FU) << 1;
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::memcpy(buffer + 6U, data, NXDN_FRAME_LENGTH_BYTES);
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if (m_debug)
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CUtils::dump(1U, "NXDN Network Data Sent", buffer, 54U);
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return m_socket.write(buffer, 54U, m_address, m_port);
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}
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bool CNXDNNetwork::writePoll()
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{
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unsigned char buffer[20U];
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buffer[0U] = 'N';
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buffer[1U] = 'X';
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buffer[2U] = 'D';
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buffer[3U] = 'N';
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buffer[4U] = 'P';
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if (m_debug)
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CUtils::dump(1U, "NXDN Network Poll Sent", buffer, 5U);
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return m_socket.write(buffer, 5U, m_address, m_port);
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}
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void CNXDNNetwork::clock(unsigned int ms)
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{
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m_pollTimer.clock(ms);
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if (m_pollTimer.hasExpired()) {
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writePoll();
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m_pollTimer.start();
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}
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unsigned char buffer[BUFFER_LENGTH];
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in_addr address;
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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;
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// Check if the data is for us
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if (m_address.s_addr != address.s_addr || m_port != port) {
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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;
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}
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// Ignore incoming polls
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if (::memcmp(buffer, "NXDNP", 5U) == 0)
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return;
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// Invalid packet type?
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if (::memcmp(buffer, "NXDND", 5U) != 0)
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return;
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if (!m_enabled)
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return;
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if (m_debug)
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CUtils::dump(1U, "NXDN Network Data Received", buffer, length);
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m_buffer.addData(buffer, 54U);
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}
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unsigned int CNXDNNetwork::read(unsigned char* data)
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{
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assert(data != NULL);
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if (m_buffer.isEmpty())
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return 0U;
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m_buffer.getData(data, 54U);
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return 155U;
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}
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void CNXDNNetwork::reset()
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{
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}
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void CNXDNNetwork::close()
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{
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m_socket.close();
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LogMessage("Closing NXDN network connection");
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}
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void CNXDNNetwork::enable(bool enabled)
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{
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if (enabled && !m_enabled)
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reset();
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m_enabled = enabled;
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}
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