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YSFClients/YSFParrot/Network.cpp

125 lines
2.6 KiB

/*
* Copyright (C) 2009-2014,2016,2018,2020 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 "Network.h"
#include <cstdio>
#include <cassert>
#include <cstring>
const unsigned int BUFFER_LENGTH = 200U;
CNetwork::CNetwork(unsigned int port) :
m_socket(port),
m_addr(),
m_addrLen(0U)
{
}
CNetwork::~CNetwork()
{
}
bool CNetwork::open()
{
::fprintf(stdout, "Opening YSF network connection\n");
return m_socket.open();
}
bool CNetwork::write(const unsigned char* data)
{
if (m_addrLen == 0U)
return true;
assert(data != NULL);
return m_socket.write(data, 155U, m_addr, m_addrLen);
}
bool CNetwork::writePoll(const sockaddr_storage& addr, unsigned int addrLen)
{
unsigned char buffer[20U];
buffer[0] = 'Y';
buffer[1] = 'S';
buffer[2] = 'F';
buffer[3] = 'P';
buffer[4U] = 'P';
buffer[5U] = 'A';
buffer[6U] = 'R';
buffer[7U] = 'R';
buffer[8U] = 'O';
buffer[9U] = 'T';
buffer[10U] = ' ';
buffer[11U] = ' ';
buffer[12U] = ' ';
buffer[13U] = ' ';
return m_socket.write(buffer, 14U, addr, addrLen);
}
unsigned int CNetwork::read(unsigned char* data)
{
sockaddr_storage addr;
unsigned int addrLen;
int length = m_socket.read(data, BUFFER_LENGTH, addr, addrLen);
if (length <= 0)
return 0U;
// Handle incoming polls
if (::memcmp(data, "YSFP", 4U) == 0) {
writePoll(addr, addrLen);
return 0U;
}
// Handle incoming unlinks
if (::memcmp(data, "YSFU", 4U) == 0)
return 0U;
// Handle the status command
if (::memcmp(data, "YSFS", 4U) == 0) {
unsigned char status[50U];
::sprintf((char*)status, "YSFS%05u%-16.16s%-14.14s%03u", 1U, "Parrot", "Parrot", 0U);
m_socket.write(status, 42U, addr, addrLen);
return 0U;
}
// Invalid packet type?
if (::memcmp(data, "YSFD", 4U) != 0)
return 0U;
m_addr = addr;
m_addrLen = addrLen;
return 155U;
}
void CNetwork::end()
{
m_addrLen = 0U;
}
void CNetwork::close()
{
m_socket.close();
::fprintf(stdout, "Closing YSF network connection\n");
}