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MMDVMNetwork.cpp
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MMDVMNetwork.cpp
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/*
* Copyright (C) 2015,2016,2017 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 "MMDVMNetwork.h"
#include "StopWatch.h"
#include "SHA256.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
const unsigned int BUFFER_LENGTH = 500U;
const unsigned int HOMEBREW_DATA_PACKET_LENGTH = 55U;
CMMDVMNetwork::CMMDVMNetwork(const std::string& rptAddress, unsigned int rptPort, const std::string& localAddress, unsigned int localPort, bool debug) :
m_rptAddress(),
m_rptPort(rptPort),
m_id(0U),
m_netId(NULL),
m_debug(debug),
m_socket(localAddress, localPort),
m_buffer(NULL),
m_rxData(1000U, "MMDVM Network"),
m_options(),
m_configData(NULL),
m_configLen(0U),
m_positionData(NULL),
m_positionLen(0U),
m_talkerAliasData(NULL),
m_talkerAliasLen(0U)
{
assert(!rptAddress.empty());
assert(rptPort > 0U);
m_rptAddress = CUDPSocket::lookup(rptAddress);
m_buffer = new unsigned char[BUFFER_LENGTH];
m_netId = new unsigned char[4U];
m_positionData = new unsigned char[50U];
m_talkerAliasData = new unsigned char[50U];
CStopWatch stopWatch;
::srand(stopWatch.start());
}
CMMDVMNetwork::~CMMDVMNetwork()
{
delete[] m_netId;
delete[] m_buffer;
delete[] m_configData;
delete[] m_positionData;
delete[] m_talkerAliasData;
}
std::string CMMDVMNetwork::getOptions() const
{
return m_options;
}
unsigned int CMMDVMNetwork::getConfig(unsigned char* config) const
{
if (m_configData == 0U)
return 0U;
::memcpy(config, m_configData, m_configLen);
return m_configLen;
}
unsigned int CMMDVMNetwork::getId() const
{
return m_id;
}
bool CMMDVMNetwork::open()
{
LogMessage("MMDVM Network, Opening");
return m_socket.open();
}
bool CMMDVMNetwork::read(CDMRData& data)
{
if (m_rxData.isEmpty())
return false;
unsigned char length = 0U;
m_rxData.getData(&length, 1U);
m_rxData.getData(m_buffer, length);
// Is this a data packet?
if (::memcmp(m_buffer, "DMRD", 4U) != 0)
return false;
unsigned char seqNo = m_buffer[4U];
unsigned int srcId = (m_buffer[5U] << 16) | (m_buffer[6U] << 8) | (m_buffer[7U] << 0);
unsigned int dstId = (m_buffer[8U] << 16) | (m_buffer[9U] << 8) | (m_buffer[10U] << 0);
unsigned int slotNo = (m_buffer[15U] & 0x80U) == 0x80U ? 2U : 1U;
FLCO flco = (m_buffer[15U] & 0x40U) == 0x40U ? FLCO_USER_USER : FLCO_GROUP;
unsigned int streamId;
::memcpy(&streamId, m_buffer + 16U, 4U);
unsigned char ber = m_buffer[53U];
unsigned char rssi = m_buffer[54U];
data.setSeqNo(seqNo);
data.setSlotNo(slotNo);
data.setSrcId(srcId);
data.setDstId(dstId);
data.setFLCO(flco);
data.setStreamId(streamId);
data.setBER(ber);
data.setRSSI(rssi);
bool dataSync = (m_buffer[15U] & 0x20U) == 0x20U;
bool voiceSync = (m_buffer[15U] & 0x10U) == 0x10U;
if (dataSync) {
unsigned char dataType = m_buffer[15U] & 0x0FU;
data.setData(m_buffer + 20U);
data.setDataType(dataType);
data.setN(0U);
} else if (voiceSync) {
data.setData(m_buffer + 20U);
data.setDataType(DT_VOICE_SYNC);
data.setN(0U);
} else {
unsigned char n = m_buffer[15U] & 0x0FU;
data.setData(m_buffer + 20U);
data.setDataType(DT_VOICE);
data.setN(n);
}
return true;
}
bool CMMDVMNetwork::write(const CDMRData& data)
{
unsigned char buffer[HOMEBREW_DATA_PACKET_LENGTH];
::memset(buffer, 0x00U, HOMEBREW_DATA_PACKET_LENGTH);
buffer[0U] = 'D';
buffer[1U] = 'M';
buffer[2U] = 'R';
buffer[3U] = 'D';
unsigned int srcId = data.getSrcId();
buffer[5U] = srcId >> 16;
buffer[6U] = srcId >> 8;
buffer[7U] = srcId >> 0;
unsigned int dstId = data.getDstId();
buffer[8U] = dstId >> 16;
buffer[9U] = dstId >> 8;
buffer[10U] = dstId >> 0;
::memcpy(buffer + 11U, m_netId, 4U);
unsigned int slotNo = data.getSlotNo();
buffer[15U] = slotNo == 1U ? 0x00U : 0x80U;
FLCO flco = data.getFLCO();
buffer[15U] |= flco == FLCO_GROUP ? 0x00U : 0x40U;
unsigned char dataType = data.getDataType();
if (dataType == DT_VOICE_SYNC) {
buffer[15U] |= 0x10U;
} else if (dataType == DT_VOICE) {
buffer[15U] |= data.getN();
} else {
buffer[15U] |= (0x20U | dataType);
}
buffer[4U] = data.getSeqNo();
unsigned int streamId = data.getStreamId();
::memcpy(buffer + 16U, &streamId, 4U);
data.getData(buffer + 20U);
buffer[53U] = data.getBER();
buffer[54U] = data.getRSSI();
if (m_debug)
CUtils::dump(1U, "Network Transmitted", buffer, HOMEBREW_DATA_PACKET_LENGTH);
m_socket.write(buffer, HOMEBREW_DATA_PACKET_LENGTH, m_rptAddress, m_rptPort);
return true;
}
bool CMMDVMNetwork::readPosition(unsigned char* data, unsigned int& length)
{
if (m_positionLen == 0U)
return false;
::memcpy(data, m_positionData, m_positionLen);
length = m_positionLen;
m_positionLen = 0U;
return true;
}
bool CMMDVMNetwork::readTalkerAlias(unsigned char* data, unsigned int& length)
{
if (m_talkerAliasLen == 0U)
return false;
::memcpy(data, m_talkerAliasData, m_talkerAliasLen);
length = m_talkerAliasLen;
m_talkerAliasLen = 0U;
return true;
}
bool CMMDVMNetwork::writeBeacon()
{
unsigned char buffer[20U];
::memcpy(buffer + 0U, "RPTSBKN", 7U);
::memcpy(buffer + 7U, m_netId, 4U);
return m_socket.write(buffer, 11U, m_rptAddress, m_rptPort);
}
void CMMDVMNetwork::close()
{
unsigned char buffer[HOMEBREW_DATA_PACKET_LENGTH];
::memset(buffer, 0x00U, HOMEBREW_DATA_PACKET_LENGTH);
LogMessage("MMDVM Network, Closing");
::memcpy(buffer + 0U, "MSTCL", 5U);
::memcpy(buffer + 5U, m_netId, 4U);
m_socket.write(buffer, HOMEBREW_DATA_PACKET_LENGTH, m_rptAddress, m_rptPort);
m_socket.close();
}
void CMMDVMNetwork::clock(unsigned int ms)
{
in_addr address;
unsigned int port;
int length = m_socket.read(m_buffer, BUFFER_LENGTH, address, port);
if (length < 0) {
LogError("MMDVM Network, Socket has failed, reopening");
close();
open();
return;
}
// if (m_debug && length > 0)
// CUtils::dump(1U, "Network Received", m_buffer, length);
if (length > 0 && m_rptAddress.s_addr == address.s_addr && m_rptPort == port) {
if (::memcmp(m_buffer, "DMRD", 4U) == 0) {
if (m_debug)
CUtils::dump(1U, "Network Received", m_buffer, length);
unsigned char len = length;
m_rxData.addData(&len, 1U);
m_rxData.addData(m_buffer, len);
} else if (::memcmp(m_buffer, "DMRG", 4U) == 0) {
::memcpy(m_positionData, m_buffer, length);
m_positionLen = length;
} else if (::memcmp(m_buffer, "DMRA", 4U) == 0) {
::memcpy(m_talkerAliasData, m_buffer, length);
m_talkerAliasLen = length;
} else if (::memcmp(m_buffer, "RPTL", 4U) == 0) {
m_id = (m_buffer[4U] << 24) | (m_buffer[5U] << 16) | (m_buffer[6U] << 8) | (m_buffer[7U] << 0);
::memcpy(m_netId, m_buffer + 4U, 4U);
unsigned char ack[10U];
::memcpy(ack + 0U, "RPTACK", 6U);
uint32_t salt = 1U;
::memcpy(ack + 6U, &salt, sizeof(uint32_t));
m_socket.write(ack, 10U, m_rptAddress, m_rptPort);
} else if (::memcmp(m_buffer, "RPTK", 4U) == 0) {
unsigned char ack[10U];
::memcpy(ack + 0U, "RPTACK", 6U);
::memcpy(ack + 6U, m_netId, 4U);
m_socket.write(ack, 10U, m_rptAddress, m_rptPort);
} else if (::memcmp(m_buffer, "RPTCL", 5U) == 0) {
::LogMessage("MMDVM Network, The connected MMDVM is closing down");
} else if (::memcmp(m_buffer, "RPTC", 4U) == 0) {
m_configLen = length - 8U;
m_configData = new unsigned char[m_configLen];
::memcpy(m_configData, m_buffer + 8U, m_configLen);
unsigned char ack[10U];
::memcpy(ack + 0U, "RPTACK", 6U);
::memcpy(ack + 6U, m_netId, 4U);
m_socket.write(ack, 10U, m_rptAddress, m_rptPort);
} else if (::memcmp(m_buffer, "RPTO", 4U) == 0) {
m_options = std::string((char*)(m_buffer + 8U), length - 8U);
unsigned char ack[10U];
::memcpy(ack + 0U, "RPTACK", 6U);
::memcpy(ack + 6U, m_netId, 4U);
m_socket.write(ack, 10U, m_rptAddress, m_rptPort);
} else if (::memcmp(m_buffer, "RPTPING", 7U) == 0) {
unsigned char pong[11U];
::memcpy(pong + 0U, "MSTPONG", 7U);
::memcpy(pong + 7U, m_netId, 4U);
m_socket.write(pong, 11U, m_rptAddress, m_rptPort);
} else {
CUtils::dump("Unknown packet from the master", m_buffer, length);
}
}
}