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/*
* Remote Laboratory FPGA Server
*
* 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 3 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.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*
* (c) 2012 Timothy Pearson
* Raptor Engineering
* http://www.raptorengineeringinc.com
*/
#include <stdlib.h>
#include <klocale.h>
#include "fpga_conn.h"
/* exception handling */
struct exit_exception {
int c;
exit_exception(int c):c(c) { }
};
/*
The FPGASocket class provides a socket that is connected with a client.
For every client that connects to the server, the server creates a new
instance of this class.
*/
FPGASocket::FPGASocket(int sock, TQObject *parent, const char *name) :
TDEKerberosServerSocket(parent, name), m_criticalSection(0), m_stationID(-1), m_config(static_cast<FPGAServer*>(parent)->m_config), m_database(NULL), m_databaseStationsCursor(NULL) {
setServiceName("remotefpga");
line = 0;
connect(this, SIGNAL(connectionClosed()), SLOT(connectionClosedHandler()));
setSocket(sock);
}
FPGASocket::~FPGASocket() {
//
}
void FPGASocket::close() {
TDEKerberosServerSocket::close();
connectionClosedHandler();
}
void FPGASocket::connectionClosedHandler() {
printf("[DEBUG] Connection from %s closed\n\r", m_remoteHost.ascii());
if (m_criticalSection > 0) {
throw exit_exception(-1);
}
}
int FPGASocket::initiateKerberosHandshake() {
if (setUsingKerberos(true) == 0) {
TQDataStream ds(this);
ds << TQString("OK");
return 0;
}
else {
return -1;
}
}
void FPGASocket::enterCommandLoop() {
// RAJA FIXME
}
/*
The FPGAServer class handles new connections to the server. For every
client that connects, it creates a new FPGASocket -- that instance is now
responsible for the communication with that client.
*/
FPGAServer::FPGAServer(TQObject* parent, int port, KSimpleConfig* config) :
TQServerSocket( port, 1, parent ), m_config(config), m_numberOfConnections(0) {
if ( !ok() ) {
printf("[ERROR] Failed to bind to port %d\n\r", port);
exit(1);
}
socketDevice()->setAddressReusable(false);
printf("[INFO] Server started on port %d\n\r", port); fflush(stdout);
}
FPGAServer::~FPGAServer() {
//
}
void FPGAServer::newConnection(int socket) {
FPGASocket *s = new FPGASocket(socket, this);
s->m_remoteHost = s->peerAddress().toString();
printf("[DEBUG] New connection from %s\n\r", s->m_remoteHost.ascii());
if (m_numberOfConnections > 0) {
printf("[DEBUG] Connection from %s closed due to multiple access attempt\n\r", m_remoteHost.ascii());
s->close();
delete s;
s = NULL;
}
if (s->initiateKerberosHandshake() != 0) {
printf("[DEBUG] Connection from %s closed due to Kerberos failure\n\r", m_remoteHost.ascii());
s->close();
delete s;
s = NULL;
}
else {
m_numberOfConnections++;
connect(s, SIGNAL(connectionClosed()), s, SLOT(deleteLater()));
connect(s, SIGNAL(connectionClosed()), this, SLOT(remoteConnectionClosed()));
emit newConnect(s);
s->enterCommandLoop();
}
}
void FPGAServer::remoteConnectionClosed() {
m_numberOfConnections--;
}
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