MMDVM_CM/USRP2P25/P25Network.cpp

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2021-04-07 16:03:14 -04:00
/*
* Copyright (C) 2009-2014,2016 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 "P25Network.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
CP25Network::CP25Network(const std::string& localAddress, unsigned int localPort, const std::string& gatewayAddress, unsigned int gatewayPort, const std::string& callsign, bool debug) :
m_callsign(callsign),
m_address(),
m_port(gatewayPort),
m_socket(localAddress, localPort),
m_debug(debug)
{
m_callsign.resize(10U, ' ');
m_address = CUDPSocket::lookup(gatewayAddress);
}
CP25Network::~CP25Network()
{
}
bool CP25Network::open()
{
LogInfo("Opening P25 network connection");
return m_socket.open();
}
bool CP25Network::writeData(const unsigned char* data, unsigned int length)
{
assert(data != NULL);
assert(length > 0U);
if (m_debug)
CUtils::dump(1U, "P25 Network Data Sent", data, length);
return m_socket.write(data, length, m_address, m_port);
}
bool CP25Network::writePoll()
{
unsigned char data[15U];
data[0U] = 0xF0U;
for (unsigned int i = 0U; i < 10U; i++)
data[i + 1U] = m_callsign.at(i);
if (m_debug)
CUtils::dump(1U, "P25 Network Poll Sent", data, 11U);
return m_socket.write(data, 11U, m_address, m_port);
}
bool CP25Network::writeUnlink()
{
unsigned char data[15U];
data[0U] = 0xF1U;
for (unsigned int i = 0U; i < 10U; i++)
data[i + 1U] = m_callsign.at(i);
if (m_debug)
CUtils::dump(1U, "P25 Network Unlink Sent", data, 11U);
return m_socket.write(data, 11U, m_address, m_port);
}
unsigned int CP25Network::readData(unsigned char* data, unsigned int length)
{
assert(data != NULL);
assert(length > 0U);
in_addr address;
unsigned int port;
int len = m_socket.read(data, length, address, port);
if (len <= 0)
return 0U;
// Check if the data is for us
if (m_address.s_addr != address.s_addr || port != m_port) {
LogMessage("P25 packet received from an invalid source, %08X != %08X and/or %u != %u", m_address.s_addr, address.s_addr, m_port, port);
return 0U;
}
if (m_debug)
CUtils::dump(1U, "P25 Network Data Received", data, len);
return len;
}
void CP25Network::close()
{
m_socket.close();
LogInfo("Closing P25 network connection");
}