217 lines
4.3 KiB
C++
217 lines
4.3 KiB
C++
/*
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* Copyright (C) 2009-2014,2016 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 "P25Network.h"
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#include "StopWatch.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 = 100U;
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CP25Network::CP25Network(const std::string& gatewayAddress, unsigned int gatewayPort, unsigned int localPort, bool debug) :
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m_socket(localPort),
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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, "P25 Network"),
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m_pollTimer(1000U, 60U)
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{
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m_address = CUDPSocket::lookup(gatewayAddress);
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CStopWatch stopWatch;
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::srand(stopWatch.start());
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}
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CP25Network::~CP25Network()
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{
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}
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bool CP25Network::open()
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{
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LogMessage("Opening P25 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 CP25Network::writeStart()
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{
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return true;
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}
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bool CP25Network::writeHeader(const unsigned char* header)
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{
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assert(header != NULL);
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#ifdef notdef
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if (m_debug)
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CUtils::dump(1U, "P25 Network Header Sent", buffer, 49U);
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for (unsigned int i = 0U; i < 2U; i++) {
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bool ret = m_socket.write(buffer, 49U, m_address, m_port);
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if (!ret)
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return false;
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}
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#endif
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return true;
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}
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bool CP25Network::writeLDU1(const unsigned char* ldu1)
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{
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assert(ldu1 != NULL);
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#ifdef notdef
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unsigned char buffer[30U];
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if (m_debug)
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CUtils::dump(1U, "P25 Network Data Sent", buffer, length + 9U);
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return m_socket.write(buffer, length + 9U, m_address, m_port);
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#endif
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return true;
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}
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bool CP25Network::writeLDU2(const unsigned char* ldu2)
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{
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assert(ldu2 != NULL);
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#ifdef notdef
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unsigned char buffer[30U];
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if (m_debug)
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CUtils::dump(1U, "P25 Network Data Sent", buffer, length + 9U);
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return m_socket.write(buffer, length + 9U, m_address, m_port);
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#endif
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return true;
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}
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bool CP25Network::writeTerminator(const unsigned char* term)
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{
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assert(term != NULL);
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#ifdef notdef
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unsigned char buffer[30U];
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if (m_debug)
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CUtils::dump(1U, "P25 Network Data Sent", buffer, length + 9U);
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return m_socket.write(buffer, length + 9U, m_address, m_port);
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#endif
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return true;
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}
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bool CP25Network::writeEnd()
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{
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return true;
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}
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bool CP25Network::writePoll()
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{
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#ifdef notdef
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// if (m_debug)
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// CUtils::dump(1U, "P25 Network Poll Sent", buffer, 6U + length);
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return m_socket.write(buffer, 6U + length, m_address, m_port);
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#endif
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return true;
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}
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void CP25Network::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("P25 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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if (!m_enabled)
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return;
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// Invalid packet type?
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if (::memcmp(buffer, "DSRP", 4U) != 0)
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return;
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}
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unsigned int CP25Network::read(unsigned char* data, unsigned int length)
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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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unsigned char c = 0U;
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m_buffer.getData(&c, 1U);
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assert(c <= 100U);
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assert(c <= length);
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unsigned char buffer[100U];
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m_buffer.getData(buffer, c);
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switch (buffer[0U]) {
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case TAG_HEADER:
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case TAG_DATA:
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case TAG_EOT:
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::memcpy(data, buffer, c);
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return c;
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default:
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return 0U;
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}
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}
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void CP25Network::reset()
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{
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}
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void CP25Network::close()
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{
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m_socket.close();
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LogMessage("Closing P25 network connection");
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}
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void CP25Network::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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