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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 <stdio.h> /* perror() */
#include <stdlib.h> /* atoi() */
#include <sys/types.h>
#include <sys/socket.h>
#include <unistd.h> /* read() */
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <fcntl.h>
#include <termios.h>
#include <unistd.h>
#include <sys/signal.h>
#include <sys/types.h>
#include <tqtimer.h>
#include <klocale.h>
#include "fpga_conn.h"
#define ABORT_SOCKET(s) s->close(); \
s->disconnect(); \
delete s; \
s = NULL;
/* 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_loopTimer(NULL), m_config(static_cast<FPGAServer*>(parent)->m_config), m_commandLoopState(0) {
// Initialize timers
m_kerberosInitTimer = new TQTimer();
connect(m_kerberosInitTimer, SIGNAL(timeout()), this, SLOT(finishKerberosHandshake()));
setServiceName("remotefpga");
line = 0;
connect(this, SIGNAL(connectionClosed()), SLOT(connectionClosedHandler()));
connect(this, SIGNAL(connectionClosed()), parent, SLOT(remoteConnectionClosed()));
setSocket(sock);
}
FPGASocket::~FPGASocket() {
if (m_kerberosInitTimer) {
m_kerberosInitTimer->stop();
delete m_kerberosInitTimer;
m_kerberosInitTimer = NULL;
}
if (m_loopTimer) {
m_loopTimer->stop();
delete m_loopTimer;
m_loopTimer = NULL;
}
}
void FPGASocket::close() {
if (state() == TQSocket::Connected) {
TDEKerberosServerSocket::close();
connectionClosedHandler();
TQTimer::singleShot(0, parent(), SLOT(remoteConnectionClosed()));
}
}
void FPGASocket::connectionClosedHandler() {
printf("[DEBUG] Connection from %s closed\n\r", m_remoteHost.ascii());
if (m_criticalSection > 0) {
throw exit_exception(-1);
}
}
void FPGASocket::initiateKerberosHandshake() {
setUsingKerberos(true);
m_kerberosInitTimer->start(100, TRUE);
}
void FPGASocket::finishKerberosHandshake() {
if (kerberosStatus() == TDEKerberosServerSocket::KerberosInitializing) {
m_kerberosInitTimer->start(100, TRUE);
return;
}
if (kerberosStatus() == TDEKerberosServerSocket::KerberosInUse) {
m_config->setGroup("Security");
TQString masterUser = m_config->readEntry("masteruser");
TQString masterRealm = m_config->readEntry("masterrealm");
if (masterRealm == "") {
masterRealm = "(NULL)";
}
if ((m_authenticatedUserName != masterUser) || (m_authenticatedRealmName != masterRealm)) {
printf("[DEBUG] Connection from %s closed due to authentication failure (attempted connection as user %s@%s)\n\r", m_remoteHost.ascii(), masterUser.ascii(), masterRealm.ascii());
close();
return;
}
TQDataStream ds(this);
ds << TQString("OK");
enterCommandLoop();
return;
}
else {
printf("[DEBUG] Connection from %s closed due to Kerberos failure\n\r", m_remoteHost.ascii()); fflush(stdout);
close();
return;
}
}
void FPGASocket::commandLoop() {
bool transferred_data;
m_criticalSection++;
try {
transferred_data = false;
if (state() == TQSocket::Connected) {
if (m_commandLoopState == 0) {
// RAJA FIXME
}
}
m_criticalSection--;
if (transferred_data) {
if (m_loopTimer) m_loopTimer->start(0, TRUE);
}
else {
if (m_loopTimer) m_loopTimer->start(100, TRUE);
}
return;
}
catch (...) {
m_criticalSection--;
return;
}
}
int FPGASocket::enterCommandLoop() {
m_commandLoopState = 0;
if (!m_loopTimer) {
m_loopTimer = new TQTimer();
connect(m_loopTimer, SIGNAL(timeout()), this, SLOT(commandLoop()));
}
if (m_loopTimer) m_loopTimer->start(0, TRUE);
return 0;
}
/*
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);
}
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", s->m_remoteHost.ascii());
ABORT_SOCKET(s)
return;
}
connect(s, SIGNAL(connectionClosed()), s, SLOT(deleteLater()));
s->initiateKerberosHandshake();
emit newConnect(s);
}
void FPGAServer::remoteConnectionClosed() {
m_numberOfConnections--;
}
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