NXDNClients/NXDNGateway/IcomNetwork.cpp

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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 "IcomNetwork.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
const unsigned int BUFFER_LENGTH = 200U;
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CIcomNetwork::CIcomNetwork(unsigned int localPort, const std::string& rptAddress, unsigned int rptPort, bool debug) :
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m_socket(localPort),
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m_addr(),
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m_addrLen(0U),
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m_debug(debug)
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{
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assert(localPort > 0U);
assert(!rptAddress.empty());
assert(rptPort > 0U);
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if (CUDPSocket::lookup(rptAddress, rptPort, m_addr, m_addrLen) != 0)
m_addrLen = 0U;
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}
CIcomNetwork::~CIcomNetwork()
{
}
bool CIcomNetwork::open()
{
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if (m_addrLen == 0U) {
LogError("Unable to resolve the address of the Icom network");
return false;
}
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LogMessage("Opening Icom connection");
return m_socket.open();
}
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bool CIcomNetwork::write(const unsigned char* data, unsigned int length)
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{
assert(data != NULL);
unsigned char buffer[110U];
::memset(buffer, 0x00U, 110U);
buffer[0U] = 'I';
buffer[1U] = 'C';
buffer[2U] = 'O';
buffer[3U] = 'M';
buffer[4U] = 0x01U;
buffer[5U] = 0x01U;
buffer[6U] = 0x08U;
buffer[7U] = 0xE0U;
if ((data[0U] & 0xF0U) == 0x90U) {
buffer[37U] = 0x23U;
buffer[38U] = 0x02U;
buffer[39U] = 0x18U;
} else {
buffer[37U] = 0x23U;
buffer[38U] = (data[0U] == 0x81U || data[0U] == 0x83U) ? 0x1CU : 0x10U;
buffer[39U] = 0x21U;
}
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::memcpy(buffer + 40U, data, length);
if (m_debug)
CUtils::dump(1U, "Icom Data Sent", buffer, 102U);
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return m_socket.write(buffer, 102U, m_addr, m_addrLen);
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}
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unsigned int CIcomNetwork::read(unsigned char* data)
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{
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assert(data != NULL);
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unsigned char buffer[BUFFER_LENGTH];
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sockaddr_storage addr;
unsigned int addrlen;
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int length = m_socket.read(buffer, BUFFER_LENGTH, addr, addrlen);
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if (length <= 0)
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return 0U;
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if (!CUDPSocket::match(m_addr, addr)) {
LogWarning("Icom Data received from an unknown address or port");
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return 0U;
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}
// Invalid packet type?
if (::memcmp(buffer, "ICOM", 4U) != 0)
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return 0U;
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// An Icom repeater connect request
if (buffer[4U] == 0x01U && buffer[5U] == 0x61U) {
buffer[5U] = 0x62U;
buffer[37U] = 0x02U;
buffer[38U] = 0x4FU;
buffer[39U] = 0x4BU;
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m_socket.write(buffer, length, addr, addrlen);
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return 0U;
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}
if (length != 102)
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return 0U;
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if (m_debug)
CUtils::dump(1U, "Icom Data Received", buffer, length);
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::memcpy(data, buffer + 40U, 33U);
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return 33U;
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}
void CIcomNetwork::close()
{
m_socket.close();
LogMessage("Closing Icom connection");
}
void CIcomNetwork::clock(unsigned int ms)
{
}