aboutsummaryrefslogtreecommitdiff
path: root/src/stable/protocoltelnet.cpp
blob: aed23bef2b2ca815d4b75c8125951e6f8655e366 (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
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
/*
 * Copyright (C) 2007-2012 Xagasoft, All rights reserved.
 *
 * This file is part of the libbu++ library and is released under the
 * terms of the license contained in the file LICENSE.
 */

#include "bu/protocoltelnet.h"
#include "bu/client.h"

/* We apparently at least want defs for the lower 13, not sure we care about
 * the rest of the chars, maybe escape.
 */
#define CH_NUL		'\x00'	/* NUL */
#define CH_SOH		'\x01'	/* Start Of Heading */
#define CH_STX		'\x02'	/* Start of Text */
#define CH_ETX		'\x03'	/* End of Text */
#define CH_EOT		'\x04'	/* End of transmission */
#define CH_ENQ		'\x05'	/* Enquiery */
#define CH_ACK		'\x06'	/* Acknowledge */
#define CH_BEL		'\x07'	/* Bell */
#define CH_BS		'\x08'	/* Backspace */
#define CH_TAB		'\x09'	/* Horizontal Tab */
#define CH_LF		'\x0A'	/* NL Line feed, new line */
#define CH_VT		'\x0B'	/* Vertical Tab */
#define CH_FF		'\x0C'	/* Form feed, new page */
#define CH_CR		'\x0D'	/* Carriage return */
#define CH_ESC		'\x1B'	/* Escape */
#define CH_DEL		'\x7F'	/* Delete */

#define CODE_SE		'\xf0'	/* End of subnegotiation params. */
#define CODE_NOP	'\xf1'	/* No operation (keep-alive). */
#define CODE_DM		'\xf2'	/* Datastream side of a Synch. */
#define CODE_BRK	'\xf3'	/* Break character. */
#define CODE_IP		'\xf4'	/* Interrupt Process character. */
#define CODE_AO		'\xf5'	/* Abort Output character. */
#define CODE_AYT	'\xf6'	/* Are You There? character. */
#define CODE_EC		'\xf7'	/* Erase Character character. */
#define CODE_EL		'\xf8'	/* Erase Line character. */
#define CODE_GA		'\xf9'	/* Go Ahead signal. */
#define CODE_SB		'\xfa'	/* Begin subnegotiation options. */
#define CODE_WILL	'\xfb'	/* Desire to do something. */
#define CODE_WONT	'\xfc'	/* Refuse to perform. */
#define CODE_DO		'\xfd'	/* Request option. */
#define CODE_DONT	'\xfe'	/* Demand a stop. */

#define CODE_IAC	'\xff'	/* Interpret-As-Command. */

#define OPT_BINARY	'\x00'	/* Binary mode (file transfers?). */
#define OPT_ECHO	'\x01'	/* (local) Echo mode. */
#define OPT_SUPGA	'\x03'	/* Suppress Go Ahead signals. */
#define OPT_STATUS	'\x05'	/* Allow status messages. */
#define OPT_TIMING	'\x06'	/* Place a timing mark in the code. */
#define OPT_EXASCII	'\x11'	/* Extended ASCII. */
#define OPT_LOGOUT	'\x12'	/* Logout. */
#define OPT_TTYPE	'\x18'	/* Terminal Type. */
#define OPT_NAWS	'\x1f'	/* Negotiate about window size. */
#define OPT_TSPEED	'\x20'	/* Terminal Speed. */
#define OPT_NEWENV	'\x27'	/* New Environment Option. */
#define OPT_EXOPL	'\xff'	/* Can we, will we, handle extended options. */

#ifndef __TELNET_DEBUG
# define printCode( a ) (void)0
# define printOpt( a ) (void)0
#endif

Bu::ProtocolTelnet::ProtocolTelnet() :
	oBinary(	*this, OPT_BINARY ),
	oEcho(		*this, OPT_ECHO ),
	oNAWS(		*this, OPT_NAWS ),
	oSuppressGA(*this, OPT_SUPGA ),
	bCanonical( true ),
	bSubOpt( false )
{
}

Bu::ProtocolTelnet::~ProtocolTelnet()
{
}

void Bu::ProtocolTelnet::onNewConnection( Bu::Client *pClient )
{
	this->pClient = pClient;
}

void Bu::ProtocolTelnet::onNewData( Bu::Client *pClient )
{
	char bc;
	int iLeft;
	while( (iLeft = pClient->getInputSize()) )
	{
		if( bSubOpt )
		{
			pClient->peek( &bc, 1 );
			if( bc == CODE_IAC )
			{
				if( iLeft <= 1 ) return;
				char bc2;
				printCode( CODE_IAC );
				pClient->peek( &bc2, 1, 1 );
				printCode( bc2 );
				if( bc2 == CODE_SE )
				{
					bSubOpt = false;
					onSubOpt();
				}
				else if( bc2 == CODE_IAC )
				{
					sSubBuf += CODE_IAC;
				}
				else
				{
					// Error of some sort.
				}
				pClient->seek( 1 );
			}
			else
			{
				sSubBuf += bc;
			}
			pClient->seek( 1 );
		}
		else
		{
			pClient->peek( &bc, 1 );
			if( bc == CODE_IAC )
			{
				if( iLeft <= 1 ) return;
				char bc2;
				pClient->peek( &bc2, 1, 1 );
				printCode( bc );
				printCode( bc2 );

				switch( bc2 )
				{
					case CODE_WILL:
						if( iLeft <= 2 ) return;
						{
							char bc3;
							pClient->peek( &bc3, 1, 2 );
							pClient->seek( 1 );
							printOpt( bc3 );
							onWill( bc3 );
						}
						break;

					case CODE_WONT:
						if( iLeft <= 2 ) return;
						{
							char bc3;
							pClient->peek( &bc3, 1, 2 );
							pClient->seek( 1 );
							printOpt( bc3 );
							onWont( bc3 );
						}
						break;

					case CODE_DO:
						if( iLeft <= 2 ) return;
						{
							char bc3;
							pClient->peek( &bc3, 1, 2 );
							pClient->seek( 1 );
							printOpt( bc3 );
							onDo( bc3 );
						}
						break;

					case CODE_DONT:
						if( iLeft <= 2 ) return;
						{
							char bc3;
							pClient->peek( &bc3, 1, 2 );
							pClient->seek( 1 );
							printOpt( bc3 );
							onDont( bc3 );
						}
						break;

					case CODE_SB:
						if( iLeft <= 2 ) return;
						{
							pClient->peek( &cSubOpt, 1, 2 );
							pClient->seek( 1 );
							printOpt( cSubOpt );
							bSubOpt = true;
						}
						break;

					case CODE_IAC:
						sDataBuf += CODE_IAC;
						printCode( CODE_IAC );
						break;
				}
				pClient->seek( 1 );
#ifdef __TELNET_DEBUG
				printf("\n");
#endif
			}
			else if( bc == CODE_SB )
			{
			}
			else
			{
				// This is where control code handling goes
				// Also, possibly, character code conversion, although I'm not
				// sure that really matters anymore, go ASCII/UTF-8
				if( bCanonical )
				{
					if( bc < 0x20 || bc >= CH_DEL )
					{
						if( bc == CH_CR )
						{
							if( iLeft <= 1 ) return;
							char bc2;
							pClient->peek( &bc2, 1, 1 );
							if( bc2 == CH_NUL || bc2 == CH_LF )
							{
								onCtlChar( bc );
								gotLine( sDataBuf );
								sDataBuf.clear();
							}
							pClient->seek( 1 );
						}
						else
						{
							onCtlChar( bc );
						}
					}
					else
					{
						sDataBuf += bc;
						if( oEcho.isLocalSet() )
						{
							pClient->write( &bc, 1 );
#ifdef __TELNET_DEBUG
							printf("%c", bc );
							fflush( stdout );
#endif
						}
					}
				}
				else
				{
					sDataBuf += bc;
					if( oEcho.isLocalSet() )
					{
						pClient->write( &bc, 1 );
					}
				}
			}
			pClient->seek( 1 );
		}
	}

	// It's true, this code will not be executed if we only have half of an
	// IAC code or multibyte escape sequence or something, but then again, it
	// shouldn't be called then, and really, shouldn't be, it'll be called soon
	// enough, when we get the rest of that code.
	if( !bCanonical )
	{
		gotData( sDataBuf );
	}
}

void Bu::ProtocolTelnet::setCanonical( bool bCon )
{
	bCanonical = bCon;
}

bool Bu::ProtocolTelnet::isCanonical()
{
	return bCanonical;
}

void Bu::ProtocolTelnet::write( const Bu::String &sData )
{
	write( sData.getStr(), sData.getSize() );
}

void Bu::ProtocolTelnet::write( const char *pData, int iSize )
{
	int iLast = 0, j;
	for( j = iLast; j < iSize; j++ )
	{
		if( pData[j] == '\n' )
		{
			if( j+1 >= iSize ||
				(pData[j+1] != '\r' && pData[j+1] != '\0') )
			{
				pClient->write( pData+iLast, j-iLast );
				pClient->write( "\n\r", 2 );
				iLast = j+1;
			}
			else
			{
				j++;
			}
		}
	}
	if( j > iLast )
	{
		pClient->write( pData+iLast, iSize-iLast );
	}
	//pClient->write( pData, iSize );
}

void Bu::ProtocolTelnet::write( char cData )
{
	write( &cData, 1 );
}

void Bu::ProtocolTelnet::onWill( char cCode )
{
	try
	{
		Option *pOpt = hOpts[cCode];
		if( pOpt->isRemoteEnabled() )
		{
			pOpt->fOpts |= Option::fRemoteIs;
			char buf[3] = { CODE_IAC, CODE_DO, cCode };
			pClient->write( buf, 3 );
		}
		else
		{
			char buf[3] = { CODE_IAC, CODE_DONT, cCode };
			pClient->write( buf, 3 );
		}

	}
	catch( Bu::HashException &e )
	{
		char buf[3] = { CODE_IAC, CODE_DONT, cCode };
		pClient->write( buf, 3 );
	}
}

void Bu::ProtocolTelnet::onWont( char cCode )
{
	try
	{
		Option *pOpt = hOpts[cCode];

		pOpt->fOpts &= ~Option::fRemoteIs;
		char buf[3] = { CODE_IAC, CODE_DONT, cCode };
		pClient->write( buf, 3 );
	}
	catch( Bu::HashException &e )
	{
		char buf[3] = { CODE_IAC, CODE_DONT, cCode };
		pClient->write( buf, 3 );
	}
}

void Bu::ProtocolTelnet::onDo( char cCode )
{
	try
	{
		Option *pOpt = hOpts[cCode];
		if( pOpt->isLocalEnabled() )
		{
			pOpt->fOpts |= Option::fLocalIs;
			char buf[3] = { CODE_IAC, CODE_WILL, cCode };
			pClient->write( buf, 3 );
		}
		else
		{
			char buf[3] = { CODE_IAC, CODE_WONT, cCode };
			pClient->write( buf, 3 );
		}

	}
	catch( Bu::HashException &e )
	{
		char buf[3] = { CODE_IAC, CODE_WONT, cCode };
		pClient->write( buf, 3 );
	}
}

void Bu::ProtocolTelnet::onDont( char cCode )
{
	try
	{
		Option *pOpt = hOpts[cCode];

		pOpt->fOpts &= ~Option::fLocalIs;
		char buf[3] = { CODE_IAC, CODE_DONT, cCode };
		pClient->write( buf, 3 );
	}
	catch( Bu::HashException &e )
	{
		char buf[3] = { CODE_IAC, CODE_DONT, cCode };
		pClient->write( buf, 3 );
	}
}

void Bu::ProtocolTelnet::onSubOpt()
{
	switch( cSubOpt )
	{
		case OPT_NAWS:
			{
				uint16_t iWidth, iHeight;
				((char *)&iWidth)[1] = sSubBuf[0];
				((char *)&iWidth)[0] = sSubBuf[1];
				((char *)&iHeight)[1] = sSubBuf[2];
				((char *)&iHeight)[0] = sSubBuf[3];
				onSubNAWS( iWidth, iHeight );
			}
			break;

		default:
			onSubUnknown( cSubOpt, sSubBuf );
			break;
	}

	sSubBuf.clear();
}

void Bu::ProtocolTelnet::onCtlChar( char cChr )
{
#ifdef __TELNET_DEBUG 
	switch( cChr )
	{
		case CH_NUL:	printf("NUL ");	break;
		case CH_SOH:	printf("SOH ");	break;
		case CH_STX:	printf("STX ");	break;
		case CH_ETX:	printf("ETX ");	break;
		case CH_EOT:	printf("EOT ");	break;
		case CH_ENQ:	printf("ENQ ");	break;
		case CH_ACK:	printf("ACK ");	break;
		case CH_BEL:	printf("BEL ");	break;
		case CH_BS:		printf("BS ");	break;
		case CH_TAB:	printf("TAB ");	break;
		case CH_LF:		printf("LF ");	break;
		case CH_VT:		printf("VT ");	break;
		case CH_FF:		printf("FF ");	break;
		case CH_CR:		printf("CR ");	break;
		case CH_ESC:	printf("ESC "); break;
		case CH_DEL:	printf("DEL ");	break;
		default:		printf("!![%02x] ", cChr );	break;
	}
	fflush( stdout );
#endif

	switch( cChr )
	{
		case CH_DEL:
			{
				if( sDataBuf.getSize() > 0 )
				{
					sDataBuf.resize( sDataBuf.getSize()-1 );
					char buf[3] = { CH_BS, ' ', CH_BS };
					pClient->write( buf, 3 );
				}
			}
			break;

	}
}

#ifdef __TELNET_DEBUG
void Bu::ProtocolTelnet::printCode( char cCode )
{
	switch( cCode )
	{
		case CODE_SE:		printf("SE ");		break;
		case CODE_NOP:		printf("NOP ");		break;
		case CODE_DM:		printf("DM ");		break;
		case CODE_BRK:		printf("BRK ");		break;
		case CODE_IP:		printf("IP ");		break;
		case CODE_AO:		printf("AO ");		break;
		case CODE_AYT:		printf("AYT ");		break;
		case CODE_EC:		printf("EC ");		break;
		case CODE_EL:		printf("EL ");		break;
		case CODE_GA:		printf("GA ");		break;
		case CODE_SB:		printf("SB ");		break;
		case CODE_WILL:		printf("WILL ");	break;
		case CODE_WONT:		printf("WONT ");	break;
		case CODE_DO:		printf("DO ");		break;
		case CODE_DONT:		printf("DONT ");	break;
		case CODE_IAC:		printf("IAC ");		break;
		default:			printf("??%02x ", cCode );	break;
	}
	fflush( stdout );
}

void Bu::ProtocolTelnet::printOpt( char cOpt )
{
	switch( cOpt )
	{
		case OPT_BINARY:	printf("BINARY ");	break;
		case OPT_ECHO:		printf("ECHO ");	break;
		case OPT_SUPGA:		printf("SUPGA ");	break;
		case OPT_STATUS:	printf("STATUS ");	break;
		case OPT_TIMING:	printf("TIMING ");	break;
		case OPT_EXASCII:	printf("EXASCII ");	break;
		case OPT_LOGOUT:	printf("LOGOUT ");	break;
		case OPT_TTYPE:		printf("TTYPE ");	break;
		case OPT_NAWS:		printf("NAWS ");	break;
		case OPT_TSPEED:	printf("TSPEED ");	break;
		case OPT_NEWENV:	printf("NEWENV ");	break;
		case OPT_EXOPL:		printf("EXOPL ");	break;
		default:			printf("??%02x ", cOpt);	break;
	}
	fflush( stdout );
}
#endif

Bu::ProtocolTelnet::Option::Option( Bu::ProtocolTelnet &rPT, char cCode ) :
	rPT( rPT ),
	fOpts( 0 ),
	cCode( cCode )
{
	rPT.hOpts.insert( cCode, this );
}

Bu::ProtocolTelnet::Option::~Option()
{
}

void Bu::ProtocolTelnet::Option::localEnable( bool bSet )
{
	if( bSet == (bool)(!(fOpts&fLocalCant)) ) return;

	if( bSet )
		fOpts &= ~fLocalCant;
	else
		fOpts |= fLocalCant;
}

void Bu::ProtocolTelnet::Option::localSet( bool bSet )
{
	if( bSet == (bool)(fOpts&fLocalIs) ) return;

	char buf[3] = { CODE_IAC, 0, cCode };

	if( bSet )
	{
		buf[1] = CODE_WILL;
		rPT.pClient->write( buf, 3 );
#ifdef __TELNET_DEBUG
		printf("<= ");
		rPT.printCode( buf[0] );
		rPT.printCode( buf[1] );
		rPT.printOpt( buf[2] );
		printf("\n");
#endif
	}
	else
	{
		buf[1] = CODE_WONT;
		rPT.pClient->write( buf, 3 );
#ifdef __TELNET_DEBUG
		printf("<= ");
		rPT.printCode( buf[0] );
		rPT.printCode( buf[1] );
		rPT.printOpt( buf[2] );
		printf("\n");
#endif
	}
}

bool Bu::ProtocolTelnet::Option::isLocalEnabled()
{
	return (bool)(!(fOpts&fLocalCant));
}

bool Bu::ProtocolTelnet::Option::isLocalSet()
{
	return (bool)(fOpts&fLocalIs);
}

void Bu::ProtocolTelnet::Option::remoteEnable( bool /*bSet*/ )
{
	return;
}

void Bu::ProtocolTelnet::Option::remoteSet( bool bSet )
{
	//if( bSet == (bool)(fOpts&fRemoteIs) ) return;

	char buf[3] = { CODE_IAC, 0, cCode };

	if( bSet )
	{
		buf[1] = CODE_DO;
		rPT.pClient->write( buf, 3 );
#ifdef __TELNET_DEBUG
		printf("<= ");
		rPT.printCode( buf[0] );
		rPT.printCode( buf[1] );
		rPT.printOpt( buf[2] );
		printf("\n");
#endif
	}
	else
	{
		buf[1] = CODE_DONT;
		rPT.pClient->write( buf, 3 );
#ifdef __TELNET_DEBUG
		printf("<= ");
		rPT.printCode( buf[0] );
		rPT.printCode( buf[1] );
		rPT.printOpt( buf[2] );
		printf("\n");
#endif
	}
}

bool Bu::ProtocolTelnet::Option::isRemoteEnabled()
{
	return (bool)(!(fOpts&fRemoteCant));
}

bool Bu::ProtocolTelnet::Option::isRemoteSet()
{
	return (bool)(fOpts&fRemoteIs);
}