aboutsummaryrefslogtreecommitdiffstats
path: root/ncpd/socketchan.cc
blob: a7d612e833cc340f4258f9e4d449204b56251dd3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
// $Id$
//
//  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;
}