134 lines
2.8 KiB
C++
134 lines
2.8 KiB
C++
/*
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* Copyright (C) 2009-2014,2016,2019,2020 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 "M17Network.h"
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#include "M17Defines.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 = 200U;
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CM17Network::CM17Network(unsigned int localPort, const std::string& gatewayAddress, unsigned int gatewayPort, 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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m_enabled(false),
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m_buffer(1000U, "M17 Network")
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{
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if (CUDPSocket::lookup(gatewayAddress, gatewayPort, m_addr, m_addrLen) != 0)
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m_addrLen = 0U;
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}
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CM17Network::~CM17Network()
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{
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}
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bool CM17Network::open()
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{
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if (m_addrLen == 0U) {
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LogError("Unable to resolve the address of the M17 Gateway");
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return false;
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}
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LogMessage("Opening M17 network connection");
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return m_socket.open(m_addr);
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}
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bool CM17Network::write(const unsigned char* data)
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{
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assert(data != NULL);
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unsigned char buffer[100U];
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buffer[0U] = 'M';
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buffer[1U] = '1';
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buffer[2U] = '7';
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if (m_debug)
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CUtils::dump(1U, "M17 data transmitted", buffer, 36U);
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return m_socket.write(buffer, 36U, m_addr, m_addrLen);
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}
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void CM17Network::clock(unsigned int ms)
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{
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unsigned char buffer[BUFFER_LENGTH];
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sockaddr_storage address;
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unsigned int addrLen;
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int length = m_socket.read(buffer, BUFFER_LENGTH, address, addrLen);
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if (length <= 0)
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return;
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if (!CUDPSocket::match(m_addr, address)) {
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LogMessage("M17, packet received from an invalid source");
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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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if (m_debug)
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CUtils::dump(1U, "M17 Network Data Received", buffer, length);
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if (::memcmp(buffer + 0U, "M17", 3U) != 0)
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return;
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unsigned char c = length;
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m_buffer.addData(&c, 1U);
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m_buffer.addData(buffer, length);
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}
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bool CM17Network::read(unsigned char* data)
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{
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assert(data != NULL);
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if (m_buffer.isEmpty())
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return false;
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unsigned char c = 0U;
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m_buffer.getData(&c, 1U);
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m_buffer.getData(data, c);
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return true;
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}
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void CM17Network::close()
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{
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m_socket.close();
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LogMessage("Closing M17 network connection");
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}
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void CM17Network::enable(bool enabled)
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{
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if (!enabled && m_enabled)
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m_buffer.clear();
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m_enabled = enabled;
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}
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