/*
* 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 ) {
setServiceName ( " remotefpga " ) ;
line = 0 ;
connect ( this , SIGNAL ( connectionClosed ( ) ) , SLOT ( connectionClosedHandler ( ) ) ) ;
connect ( this , SIGNAL ( connectionClosed ( ) ) , parent , SLOT ( remoteConnectionClosed ( ) ) ) ;
setSocket ( sock ) ;
}
FPGASocket : : ~ FPGASocket ( ) {
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 ) ;
}
}
int FPGASocket : : initiateKerberosHandshake ( ) {
setUsingKerberos ( true ) ;
while ( kerberosStatus ( ) = = TDEKerberosServerSocket : : KerberosInitializing ) {
// RAJA FIXME
tqApp - > processEvents ( ) ;
}
if ( kerberosStatus ( ) = = TDEKerberosServerSocket : : KerberosInUse ) {
TQDataStream ds ( this ) ;
ds < < TQString ( " OK " ) ;
return 0 ;
}
else {
return - 1 ;
}
}
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 ;
}
if ( s - > initiateKerberosHandshake ( ) ! = 0 ) {
printf ( " [DEBUG] Connection from %s closed due to Kerberos failure \n \r " , s - > m_remoteHost . ascii ( ) ) ;
ABORT_SOCKET ( s )
return ;
}
m_config - > setGroup ( " Security " ) ;
TQString masterUser = m_config - > readEntry ( " masteruser " ) ;
TQString masterRealm = m_config - > readEntry ( " masterrealm " ) ;
if ( masterRealm = = " " ) {
masterRealm = " (NULL) " ;
}
if ( ( s - > m_authenticatedUserName ! = masterUser ) | | ( s - > m_authenticatedRealmName ! = masterRealm ) ) {
printf ( " [DEBUG] Connection from %s closed due to authentication failure (attempted connection as user %s@%s) \n \r " , s - > m_remoteHost . ascii ( ) , masterUser . ascii ( ) , masterRealm . ascii ( ) ) ;
ABORT_SOCKET ( s )
return ;
}
else {
m_numberOfConnections + + ;
connect ( s , SIGNAL ( connectionClosed ( ) ) , s , SLOT ( deleteLater ( ) ) ) ;
emit newConnect ( s ) ;
s - > enterCommandLoop ( ) ;
}
}
void FPGAServer : : remoteConnectionClosed ( ) {
m_numberOfConnections - - ;
}