NXDNClients/NXDNGateway/NXDNNetwork.cpp

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/*
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* Copyright (C) 2009-2014,2016,2018,2020 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 "NXDNNetwork.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
CNXDNNetwork::CNXDNNetwork(unsigned short port, const std::string& callsign, bool debug) :
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m_callsign(callsign),
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m_socket(),
m_port(port),
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m_debug(debug)
{
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assert(port > 0U);
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m_callsign.resize(10U, ' ');
}
CNXDNNetwork::~CNXDNNetwork()
{
}
bool CNXDNNetwork::open()
{
LogInfo("Opening NXDN network connection");
unsigned int index = 0U;
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bool ret1 = m_socket.open(index, PF_INET, "", m_port);
if (ret1)
index++;
bool ret2 = m_socket.open(index, PF_INET6, "", m_port);
// We're OK as long as we have either IPv4 or IPv6 or both.
return ret1 || ret2;
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}
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bool CNXDNNetwork::writeData(const unsigned char* data, unsigned int length, unsigned short srcId, unsigned short dstId, bool grp, const sockaddr_storage& addr, unsigned int addrLen)
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{
assert(data != NULL);
assert(length > 0U);
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unsigned char buffer[50U];
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buffer[0U] = 'N';
buffer[1U] = 'X';
buffer[2U] = 'D';
buffer[3U] = 'N';
buffer[4U] = 'D';
buffer[5U] = (srcId >> 8) & 0xFFU;
buffer[6U] = (srcId >> 0) & 0xFFU;
buffer[7U] = (dstId >> 8) & 0xFFU;
buffer[8U] = (dstId >> 0) & 0xFFU;
buffer[9U] = 0x00U;
buffer[9U] |= grp ? 0x01U : 0x00U;
if (data[0U] == 0x81U || data[0U] == 0x83U) {
// This is a voice header or trailer.
buffer[9U] |= data[5U] == 0x01U ? 0x04U : 0x00U;
buffer[9U] |= data[5U] == 0x08U ? 0x08U : 0x00U;
} else if ((data[0U] & 0xF0U) == 0x90U) {
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// This is data.
buffer[9U] |= 0x02U;
if (data[0U] == 0x90U || data[0U] == 0x92U || data[0U] == 0x9CU || data[0U] == 0x9EU) {
// This is data header or trailer.
buffer[9U] |= data[2U] == 0x09U ? 0x04U : 0x00U;
buffer[9U] |= data[2U] == 0x08U ? 0x08U : 0x00U;
}
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}
::memcpy(buffer + 10U, data, 33U);
if (m_debug)
CUtils::dump(1U, "NXDN Network Data Sent", buffer, 43U);
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return m_socket.write(buffer, 43U, addr, addrLen);
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}
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bool CNXDNNetwork::writePoll(const sockaddr_storage& addr, unsigned int addrLen, unsigned short tg)
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{
unsigned char data[20U];
data[0U] = 'N';
data[1U] = 'X';
data[2U] = 'D';
data[3U] = 'N';
data[4U] = 'P';
for (unsigned int i = 0U; i < 10U; i++)
data[i + 5U] = m_callsign.at(i);
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data[15U] = (tg >> 8) & 0xFFU;
data[16U] = (tg >> 0) & 0xFFU;
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if (m_debug)
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CUtils::dump(1U, "NXDN Network Poll Sent", data, 17U);
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return m_socket.write(data, 17U, addr, addrLen);
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}
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bool CNXDNNetwork::writeUnlink(const sockaddr_storage& addr, unsigned int addrLen, unsigned short tg)
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{
unsigned char data[20U];
data[0U] = 'N';
data[1U] = 'X';
data[2U] = 'D';
data[3U] = 'N';
data[4U] = 'U';
for (unsigned int i = 0U; i < 10U; i++)
data[i + 5U] = m_callsign.at(i);
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data[15U] = (tg >> 8) & 0xFFU;
data[16U] = (tg >> 0) & 0xFFU;
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if (m_debug)
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CUtils::dump(1U, "NXDN Network Unlink Sent", data, 17U);
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return m_socket.write(data, 17U, addr, addrLen);
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}
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unsigned int CNXDNNetwork::readData(unsigned char* data, unsigned int length, sockaddr_storage& addr, unsigned int& addrLen)
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{
assert(data != NULL);
assert(length > 0U);
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int len = m_socket.read(data, length, addr, addrLen);
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if (len <= 0)
return 0U;
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if ((::memcmp(data, "NXDNP", 5U) == 0 && len == 17) || (::memcmp(data, "NXDND", 5U) == 0 && len == 43)) {
if (m_debug)
CUtils::dump(1U, "NXDN Network Data Received", data, len);
return len;
}
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return 0U;
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}
void CNXDNNetwork::close()
{
m_socket.close();
LogInfo("Closing NXDN network connection");
}