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YSFClients/YSFGateway/FCSNetwork.cpp

260 lines
5.9 KiB

/*
* Copyright (C) 2009-2014,2016,2017,2018 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 "YSFDefines.h"
#include "FCSNetwork.h"
#include "Utils.h"
#include "Log.h"
#include <cstdio>
#include <cassert>
#include <cstring>
const char* FCS_VERSION = "MMDVM";
const unsigned int BUFFER_LENGTH = 200U;
CFCSNetwork::CFCSNetwork(unsigned int port, const std::string& callsign, unsigned int rxFrequency, unsigned int txFrequency, const std::string& locator, unsigned int id, bool debug) :
m_socket(port),
m_debug(debug),
m_address(),
m_ping(NULL),
m_info(NULL),
m_reflector(),
m_print(),
m_buffer(1000U, "FCS Network Buffer"),
m_n(0U),
m_pingTimer(1000U, 0U, 800U),
m_resetTimer(1000U, 1U),
m_state(FCS_UNLINKED)
{
m_info = new unsigned char[100U];
::sprintf((char*)m_info, "%9u%9u%-6.6s%-12.12s%7u", rxFrequency, txFrequency, locator.c_str(), FCS_VERSION, id);
::memset(m_info + 43U, ' ', 57U);
m_ping = new unsigned char[25U];
::memcpy(m_ping + 0U, "PING", 4U);
::memset(m_ping + 4U, ' ', 6U);
::memcpy(m_ping + 4U, callsign.c_str(), callsign.size());
::memset(m_ping + 10U, 0x00U, 15U);
}
CFCSNetwork::~CFCSNetwork()
{
delete[] m_info;
delete[] m_ping;
}
bool CFCSNetwork::open()
{
LogMessage("Resolving FCS00x addresses");
m_addresses["FCS001"] = CUDPSocket::lookup("fcs001.xreflector.net");
m_addresses["FCS002"] = CUDPSocket::lookup("fcs002.xreflector.net");
m_addresses["FCS003"] = CUDPSocket::lookup("fcs003.xreflector.net");
m_addresses["FCS004"] = CUDPSocket::lookup("fcs004.xreflector.net");
LogMessage("Opening FCS network connection");
return m_socket.open();
}
void CFCSNetwork::clearDestination()
{
m_pingTimer.stop();
m_resetTimer.stop();
m_state = FCS_UNLINKED;
}
void CFCSNetwork::write(const unsigned char* data)
{
assert(data != NULL);
if (m_state != FCS_LINKED)
return;
unsigned char buffer[130U];
::memset(buffer + 0U, ' ', 130U);
::memcpy(buffer + 0U, data + 35U, 120U);
::memcpy(buffer + 121U, m_reflector.c_str(), 8U);
if (m_debug)
CUtils::dump(1U, "FCS Network Data Sent", buffer, 130U);
m_socket.write(buffer, 130U, m_address, FCS_PORT);
}
bool CFCSNetwork::writeLink(const std::string& reflector)
{
if (m_state != FCS_LINKED) {
std::string name = reflector.substr(0U, 6U);
if (m_addresses.count(name) == 0U) {
LogError("Unknown FCS reflector - %s", name.c_str());
return false;
}
m_address = m_addresses[name];
if (m_address.s_addr == INADDR_NONE) {
LogError("FCS reflector %s has no address", name.c_str());
return false;
}
}
m_reflector = reflector;
::memcpy(m_ping + 10U, reflector.c_str(), 8U);
m_print = reflector.substr(0U, 6U) + "-" + reflector.substr(6U);
m_state = FCS_LINKING;
m_pingTimer.start();
writePing();
return true;
}
void CFCSNetwork::writeUnlink(unsigned int count)
{
if (m_state != FCS_LINKED)
return;
for (unsigned int i = 0U; i < count; i++)
m_socket.write((unsigned char*)"CLOSE ", 11U, m_address, FCS_PORT);
}
void CFCSNetwork::clock(unsigned int ms)
{
m_pingTimer.clock(ms);
if (m_pingTimer.isRunning() && m_pingTimer.hasExpired()) {
writePing();
m_pingTimer.start();
}
m_resetTimer.clock(ms);
if (m_resetTimer.isRunning() && m_resetTimer.hasExpired()) {
m_n = 0U;
m_resetTimer.stop();
}
unsigned char buffer[BUFFER_LENGTH];
in_addr address;
unsigned int port;
int length = m_socket.read(buffer, BUFFER_LENGTH, address, port);
if (length <= 0)
return;
if (m_state == FCS_UNLINKED)
return;
if (address.s_addr != m_address.s_addr || port != FCS_PORT)
return;
if (m_debug)
CUtils::dump(1U, "FCS Network Data Received", buffer, length);
if (length == 7) {
if (m_state == FCS_LINKING)
LogMessage("Linked to %s", m_print.c_str());
m_state = FCS_LINKED;
writeInfo();
}
if (length == 10 && m_state == FCS_LINKING) {
LogMessage("Linked to %s", m_print.c_str());
m_state = FCS_LINKED;
writeInfo();
}
if (length == 7 || length == 10 || length == 130) {
unsigned char len = length;
m_buffer.addData(&len, 1U);
m_buffer.addData(buffer, len);
}
}
unsigned int CFCSNetwork::read(unsigned char* data)
{
assert(data != NULL);
if (m_buffer.isEmpty())
return 0U;
unsigned char len = 0U;
m_buffer.getData(&len, 1U);
// Pass pings up to the gateway to reset the lost timer.
if (len != 130U) {
m_buffer.getData(data, len);
::memset(data + 0U, ' ', 14U);
::memcpy(data + 0U, "YSFP", 4U);
::memcpy(data + 4U, m_print.c_str(), 8U);
return 14U;
}
m_resetTimer.start();
unsigned char buffer[130U];
m_buffer.getData(buffer, len);
::memset(data + 0U, ' ', 35U);
::memcpy(data + 0U, "YSFD", 4U);
::memcpy(data + 35U, buffer, 120U);
// Put the reflector name as the via callsign.
::memcpy(data + 4U, m_print.c_str(), 9U);
data[34U] = m_n;
m_n += 2U;
return 155U;
}
void CFCSNetwork::close()
{
m_socket.close();
LogMessage("Closing FCS network connection");
}
void CFCSNetwork::writeInfo()
{
if (m_state != FCS_LINKED)
return;
if (m_debug)
CUtils::dump(1U, "FCS Network Data Sent", m_info, 100U);
m_socket.write(m_info, 100U, m_address, FCS_PORT);
}
void CFCSNetwork::writePing()
{
if (m_state == FCS_UNLINKED)
return;
if (m_debug)
CUtils::dump(1U, "FCS Network Data Sent", m_ping, 25U);
m_socket.write(m_ping, 25U, m_address, FCS_PORT);
}