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// $Id$
//
// PLP - An implementation of the PSION link protocol
//
// Copyright (C) 1999 Philip Proudman
// Modifications for plptools:
// Copyright (C) 1999 Fritz Elfert <felfert@to.com>
//
// 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
//
// e-mail philip.proudman@btinternet.com
#include <stream.h>
#include "stdio.h"
#include "string.h"
#include "malloc.h"
#include "bool.h"
#include "socketchan.h"
#include "ncp.h"
#include "ppsocket.h"
#include "iowatch.h"
socketChan:: socketChan(ppsocket * _skt, ncp * _ncpController, IOWatch & _iow):
channel(_ncpController),
iow(_iow)
{
skt = _skt;
connectName = 0;
connectTry = 0;
iow.addIO(skt->socket());
connected = false;
}
socketChan::~socketChan()
{
iow.remIO(skt->socket());
skt->closeSocket();
delete skt;
if (connectName)
free(connectName);
}
void socketChan::
ncpDataCallback(bufferStore & a)
{
if (connectName != 0) {
skt->sendBufferStore(a);
} else
cerr << "socketchan: Connect without name!!!\n";
}
char *socketChan::
getNcpConnectName()
{
return connectName;
}
// NCP Command processing
bool socketChan::
ncpCommand(bufferStore & a)
{
cerr << "socketChan:: received NCP command (" << a << ")" << endl;
// str is guaranteed to begin with NCP$, and all NCP commands are
// greater than or equal to 8 characters in length.
const char *str = a.getString();
// unsigned long len = a.getLen();
bool ok = false;
if (!strncmp(str+4, "INFO", 4)) {
// Send information discovered during the receipt of the
// NCON_MSG_NCP_INFO message.
a.init();
switch (ncpProtocolVersion()) {
case PV_SERIES_3:
a.addStringT("Series 3");
break;
case PV_SERIES_5:
a.addStringT("Series 5");
break;
default:
cerr << "ncpd: protocol version not known" << endl;
a.addStringT("Unknown!");
break;
}
skt->sendBufferStore(a);
ok = true;
} else if (!strncmp(str+4, "CONN", 4)) {
// Connect to a channel that was placed in 'pending' mode, by
// checking the channel table against the ID...
// DO ME LATER
ok = true;
} else if (!strncmp(str+4, "CHAL", 4)) {
// Challenge
// The idea is that the channel stays in 'secure' mode until a
// valid RESP is received
// DO ME LATER
ok = true;
} else if (!strncmp(str+4, "RESP", 4)) {
// Reponse - here is the plaintext as sent in the CHAL - the
// channel will only open up if this matches what ncpd has for
// the encrypted plaintext.
// DO ME LATER
ok = true;
}
return ok;
}
void socketChan::
ncpConnectAck()
{
bufferStore a;
a.addStringT("Ok");
skt->sendBufferStore(a);
connected = true;
connectTry = 3;
}
void socketChan::
ncpConnectTerminate()
{
bufferStore a;
connectTry = 0;
a.addStringT("Close");
skt->sendBufferStore(a);
terminateWhenAsked();
}
void socketChan::
ncpRegisterAck()
{
connectTry++;
ncpConnect();
}
void socketChan::
ncpConnectNak()
{
if (!connectName || (connectTry > 1))
ncpConnectTerminate();
else {
connectTry++;
ncpRegister();
}
}
void socketChan::
socketPoll()
{
if (connectName == 0) {
bufferStore a;
if (skt->getBufferStore(a, false) == 1) {
// A client has connected, and is announcing who it
// is... e.g. "SYS$RFSV.*"
//
// An NCP Channel can be in 'Control' or 'Data' mode.
// Initially, it is in 'Control' mode, and can accept
// certain commands.
//
// When a command is received that ncpd does not
// understand, this is assumed to be a request to
// connect to the remote service of that name, and enter
// 'data' mode.
//
// Later, there might be an explicit command to enter
// 'data' mode, and also a challenge-response protocol
// before any connection can be made.
//
// All commands begin with "NCP$".
// There is a magic process name called "NCP$INFO.*"
// which is announced by the rfsvfactory. This causes a
// response to be issued containing the NCP version
// number. The rfsvfactory will create the correct type
// of RFSV protocol handler, which will then announce
// itself. So, first time in here, we might get the
// NCP$INFO.*
if (a.getLen() > 8 && !strncmp(a.getString(), "NCP$", 4)) {
if (!ncpCommand(a))
cerr << "ncpd: command " << a << " unrecognised." << endl;
return;
}
// This isn't a command, it's a remote process. Connect.
connectName = strdup(a.getString());
connectTry++;
ncpConnect();
}
} else if (connected) {
bufferStore a;
int res = skt->getBufferStore(a, false);
if (res == -1) {
ncpDisconnect();
} else if (res == 1) {
if (a.getLen() > 5 &&
!strncmp(a.getString(), "Close", 5)) {
ncpDisconnect();
} else {
ncpSend(a);
}
}
}
}
bool socketChan::
isConnected()
const {
return connected;
}
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