aboutsummaryrefslogtreecommitdiffstats
path: root/packet-bootp.c
blob: 2f70c589e9fc6293589b800d5a2cdde0c3646b70 (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
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
/* packet-bootp.c
 * Routines for BOOTP/DHCP packet disassembly
 * Gilbert Ramirez <gram@xiexie.org>
 *
 * $Id: packet-bootp.c,v 1.42 2000/11/19 08:53:55 guy Exp $
 *
 * The information used comes from:
 * RFC  951: Bootstrap Protocol
 * RFC 1542: Clarifications and Extensions for the Bootstrap Protocol
 * RFC 2131: Dynamic Host Configuration Protocol
 * RFC 2132: DHCP Options and BOOTP Vendor Extensions
 * RFC 2489: Procedure for Defining New DHCP Options
 * BOOTP and DHCP Parameters
 *     http://www.isi.edu/in-notes/iana/assignments/bootp-dhcp-parameters
 *
 * Ethereal - Network traffic analyzer
 * By Gerald Combs <gerald@zing.org>
 * Copyright 1998 Gerald Combs
 *
 * 
 * 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.
 */

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_SYS_TYPES_H
# include <sys/types.h>
#endif

#include <string.h>
#include <glib.h>
#include "packet.h"
#include "packet-arp.h"

static int proto_bootp = -1;
static int hf_bootp_type = -1;
static int hf_bootp_hw_type = -1;
static int hf_bootp_hw_len = -1;
static int hf_bootp_hops = -1;
static int hf_bootp_id = -1;
static int hf_bootp_secs = -1;
static int hf_bootp_flag = -1;
static int hf_bootp_ip_client = -1;
static int hf_bootp_ip_your = -1;
static int hf_bootp_ip_server = -1;
static int hf_bootp_ip_relay = -1;
static int hf_bootp_hw_addr = -1;
static int hf_bootp_server = -1;
static int hf_bootp_file = -1;
static int hf_bootp_cookie = -1;
static int hf_bootp_dhcp = -1;

static guint ett_bootp = -1;
static guint ett_bootp_option = -1;

#define UDP_PORT_BOOTPS  67

enum field_type { none, ipv4, string, toggle, yes_no, special, opaque,
	time_in_secs,
	val_u_byte, val_u_short, val_u_long,
	val_s_long };

struct opt_info {
	char	*text;
	enum field_type ftype;
};

#define NUM_OPT_INFOS 128
#define NUM_O63_SUBOPTS 11

static int dissect_netware_ip_suboption(proto_tree *v_tree, const u_char *pd,
    int optp);

static const char *
get_dhcp_type(guint8 byte)
{
	static const char	*opt53_text[] = {
		"Unknown Message Type",
		"Discover",
		"Offer",
		"Request",
		"Decline",
		"ACK",
		"NAK",
		"Release",
		"Inform"
	};
	int i;

	if (byte > 0 && byte < (sizeof opt53_text / sizeof opt53_text[0]))
		i = byte;
	else
		i = 0;
	return opt53_text[i];
}

/* Returns the number of bytes consumed by this option. */
static int
bootp_option(const u_char *pd, proto_tree *bp_tree, int voff, int eoff)
{
	char			*text;
	enum field_type		ftype;
	u_char			code = pd[voff];
	int			vlen = pd[voff+1];
	u_char			byte;
	int			i,optp, consumed = vlen + 2;
	u_long			time_secs;
	proto_tree		*v_tree;
	proto_item		*vti;

	static const value_string nbnt_vals[] = {
	    {0x1,   "B-node" },
	    {0x2,   "P-node" },
	    {0x4,   "M-node" },
	    {0x8,   "H-node" },
	    {0,     NULL     } };

	static struct opt_info opt[] = {
		/*   0 */ { "Padding",								none },
		/*   1 */ { "Subnet Mask",							ipv4 },
		/*   2 */ { "Time Offset",							val_s_long },
		/*   3 */ { "Router",								ipv4 },
		/*   4 */ { "Time Server",							ipv4 },
		/*   5 */ { "Name Server",							ipv4 },
		/*   6 */ { "Domain Name Server",					ipv4 },
		/*   7 */ { "Log Server",							ipv4 },
		/*   8 */ { "Cookie Server",						ipv4 },
		/*   9 */ { "LPR Server",							ipv4 },
		/*  10 */ { "Impress Server",						ipv4 },
		/*  11 */ { "Resource Location Server",				ipv4 },
		/*  12 */ { "Host Name",							string },
		/*  13 */ { "Boot File Size",						val_u_short },
		/*  14 */ { "Merit Dump File",						string },
		/*  15 */ { "Domain Name",							string },
		/*  16 */ { "Swap Server",							ipv4 },
		/*  17 */ { "Root Path",							string },
		/*  18 */ { "Extensions Path",						string },
		/*  19 */ { "IP Forwarding",						toggle },
		/*  20 */ { "Non-Local Source Routing",				toggle },
		/*  21 */ { "Policy Filter",						special },
		/*  22 */ { "Maximum Datagram Reassembly Size",		val_u_short },
		/*  23 */ { "Default IP Time-to-Live",				val_u_byte },
		/*  24 */ { "Path MTU Aging Timeout",				time_in_secs },
		/*  25 */ { "Path MTU Plateau Table",				val_u_short },
		/*  26 */ { "Interface MTU",						val_u_short },
		/*  27 */ { "All Subnets are Local",				yes_no },
		/*  28 */ { "Broadcast Address",					ipv4 },
		/*  29 */ { "Perform Mask Discovery",				toggle },
		/*  30 */ { "Mask Supplier",						yes_no },
		/*  31 */ { "Perform Router Discover",				toggle },
		/*  32 */ { "Router Solicitation Address",			ipv4 },
		/*  33 */ { "Static Route",							special },
		/*  34 */ { "Trailer Encapsulation",				toggle },
		/*  35 */ { "ARP Cache Timeout",					time_in_secs },
		/*  36 */ { "Ethernet Encapsulation",				toggle },
		/*  37 */ { "TCP Default TTL", 						val_u_byte },
		/*  38 */ { "TCP Keepalive Interval",				time_in_secs },
		/*  39 */ { "TCP Keepalive Garbage",				toggle },
		/*  40 */ { "Network Information Service Domain",	string },
		/*  41 */ { "Network Information Service Servers",	ipv4 },
		/*  42 */ { "Network Time Protocol Servers",		ipv4 },
		/*  43 */ { "Vendor-Specific Information",			special },
		/*  44 */ { "NetBIOS over TCP/IP Name Server",		ipv4 },
		/*  45 */ { "NetBIOS over TCP/IP Datagram Distribution Name Server", ipv4 },
		/*  46 */ { "NetBIOS over TCP/IP Node Type",		special },
		/*  47 */ { "NetBIOS over TCP/IP Scope",			string },
		/*  48 */ { "X Window System Font Server",			ipv4 },
		/*  49 */ { "X Window System Display Manager",		ipv4 },
		/*  50 */ { "Requested IP Address",					ipv4 },
		/*  51 */ { "IP Address Lease Time",				time_in_secs },
		/*  52 */ { "Option Overload",						special },
		/*  53 */ { "DHCP Message Type",					special },
		/*  54 */ { "Server Identifier",					ipv4 },
		/*  55 */ { "Parameter Request List",				special },
		/*  56 */ { "Message",								string },
		/*  57 */ { "Maximum DHCP Message Size",			val_u_short },
		/*  58 */ { "Renewal Time Value",					time_in_secs },
		/*  59 */ { "Rebinding Time Value",					time_in_secs },
		/*  60 */ { "Vendor class identifier",				opaque },
		/*  61 */ { "Client identifier",					special },
		/*  62 */ { "Novell/Netware IP domain",					string },
		/*  63 */ { "Novell Options",	special },
		/*  64 */ { "Network Information Service+ Domain",	string },
		/*  65 */ { "Network Information Service+ Servers",	ipv4 },
		/*  66 */ { "TFTP Server Name",						string },
		/*  67 */ { "Bootfile name",						string },
		/*  68 */ { "Mobile IP Home Agent",					ipv4 },
		/*  69 */ { "SMTP Server",							ipv4 },
		/*  70 */ { "POP3 Server",							ipv4 },
		/*  71 */ { "NNTP Server",							ipv4 },
		/*  72 */ { "Default WWW Server",					ipv4 },
		/*  73 */ { "Default Finger Server",				ipv4 },
		/*  74 */ { "Default IRC Server",					ipv4 },
		/*  75 */ { "StreetTalk Server",					ipv4 },
		/*  76 */ { "StreetTalk Directory Assistance Server", ipv4 },
		/*  77 */ { "User Class Information",				opaque },
		/*  78 */ { "Directory Agent Information",			opaque },
		/*  79 */ { "Service Location Agent Scope",			opaque },
		/*  80 */ { "Naming Authority",						opaque },
		/*  81 */ { "Client Fully Qualified Domain Name",	opaque },
		/*  82 */ { "Agent Circuit ID",						opaque },
		/*  83 */ { "Agent Remote ID",						opaque },
		/*  84 */ { "Agent Subnet Mask",					opaque },
		/*  85 */ { "Novell Directory Services Servers",	opaque },
		/*  86 */ { "Novell Directory Services Tree Name",	opaque },
		/*  87 */ { "Novell Directory Services Context",	opaque },
		/*  88 */ { "IEEE 1003.1 POSIX Timezone",			opaque },
		/*  89 */ { "Fully Qualified Domain Name",			opaque },
		/*  90 */ { "Authentication",						opaque },
		/*  91 */ { "Vines TCP/IP Server Option",			opaque },
		/*  92 */ { "Server Selection Option",				opaque },
		/*  93 */ { "Client System Architecture",			opaque },
		/*  94 */ { "Client Network Device Interface",		opaque },
		/*  95 */ { "Lightweight Directory Access Protocol",	opaque },
		/*  96 */ { "IPv6 Transitions",						opaque },
		/*  97 */ { "UUID/GUID-based Client Identifier",	opaque },
		/*  98 */ { "Open Group's User Authentication",		opaque },
		/*  99 */ { "Unassigned",							opaque },
		/* 100 */ { "Printer Name",							opaque },
		/* 101 */ { "MDHCP multicast address",				opaque },
		/* 102 */ { "Removed/unassigned",					opaque },
		/* 103 */ { "Removed/unassigned",					opaque },
		/* 104 */ { "Removed/unassigned",					opaque },
		/* 105 */ { "Removed/unassigned",					opaque },
		/* 106 */ { "Removed/unassigned",					opaque },
		/* 107 */ { "Removed/unassigned",					opaque },
		/* 108 */ { "Swap Path Option",						opaque },
		/* 109 */ { "Unassigned",							opaque },
		/* 110 */ { "IPX Compability",						opaque },
		/* 111 */ { "Unassigned",							opaque },
		/* 112 */ { "Netinfo Parent Server Address",		opaque },
		/* 113 */ { "Netinfo Parent Server Tag",			opaque },
		/* 114 */ { "URL",									opaque },
		/* 115 */ { "DHCP Failover Protocol",				opaque },
		/* 116 */ { "DHCP Auto-Configuration",				opaque },
		/* 117 */ { "Unassigned",							opaque },
		/* 118 */ { "Unassigned",							opaque },
		/* 119 */ { "Unassigned",							opaque },
		/* 120 */ { "Unassigned",							opaque },
		/* 121 */ { "Unassigned",							opaque },
		/* 122 */ { "Unassigned",							opaque },
		/* 123 */ { "Unassigned",							opaque },
		/* 124 */ { "Unassigned",							opaque },
		/* 125 */ { "Unassigned",							opaque },
		/* 126 */ { "Extension",							opaque },
		/* 127 */ { "Extension",							opaque }
	};

	/* Options whose length isn't "vlen + 2". */
	switch (code) {

	case 0:		/* Padding */
		/* check how much padding we have */
		for (i = voff + 1; i < eoff; i++ ) {
			if (pd[i] != 0) {
				break;
			}
		}
		i = i - voff;
		if (bp_tree != NULL)
			proto_tree_add_text(bp_tree, NullTVB, voff, i, "Padding");
		consumed = i;
		return consumed;
		break;

	case 255:	/* End Option */
		if (bp_tree != NULL)
			proto_tree_add_text(bp_tree, NullTVB, voff, 1, "End Option");
		consumed = 1;
		return consumed;
	}

	if (bp_tree == NULL) {
		/* Don't put anything in the protocol tree. */
		return consumed;
	}

	text = opt[code].text;
	/* Special cases */
	switch (code) {

	case 21:	/* Policy Filter */
		if (vlen == 8) {
			/* one IP address pair */
			proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
				"Option %d: %s = %s/%s", code, text,
				ip_to_str((guint8*)&pd[voff+2]),
				ip_to_str((guint8*)&pd[voff+6]));
		} else {
			/* > 1 IP address pair. Let's make a sub-tree */
			vti = proto_tree_add_text(bp_tree, NullTVB, voff,
				consumed, "Option %d: %s", code, text);
			v_tree = proto_item_add_subtree(vti, ett_bootp_option);
			for (i = voff + 2; i < voff + consumed; i += 8) {
				proto_tree_add_text(v_tree, NullTVB, i, 8, "IP Address/Mask: %s/%s",
					ip_to_str((guint8*)&pd[i]),
					ip_to_str((guint8*)&pd[i+4]));
			}
		}
		break;

	case 33:	/* Static Route */
		if (vlen == 8) {
			/* one IP address pair */
			proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
				"Option %d: %s = %s/%s", code, text,
				ip_to_str((guint8*)&pd[voff+2]),
				ip_to_str((guint8*)&pd[voff+6]));
		} else {
			/* > 1 IP address pair. Let's make a sub-tree */
			vti = proto_tree_add_text(bp_tree, NullTVB, voff,
				consumed, "Option %d: %s", code, text);
			v_tree = proto_item_add_subtree(vti, ett_bootp_option);
			for (i = voff + 2; i < voff + consumed; i += 8) {
				proto_tree_add_text(v_tree, NullTVB, i, 8,
					"Destination IP Address/Router: %s/%s",
					ip_to_str((guint8*)&pd[i]),
					ip_to_str((guint8*)&pd[i+4]));
			}
		}
		break;

	case 43:	/* Vendor-Specific Info */
		proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
				"Option %d: %s", code, text);
		break;

	case 46:	/* NetBIOS-over-TCP/IP Node Type */
		byte = pd[voff+2];
		proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
				"Option %d: %s = %s", code, text,
				val_to_str(byte, nbnt_vals,
				    "Unknown (0x%02x)"));
		break;
				
	case 53:	/* DHCP Message Type */
		proto_tree_add_text(bp_tree, NullTVB, voff, 3, "Option %d: %s = DHCP %s",
			code, text, get_dhcp_type(pd[voff+2]));
		break;

	case 55:	/* Parameter Request List */
		vti = proto_tree_add_text(bp_tree, NullTVB, voff,
			vlen + 2, "Option %d: %s", code, text);
		v_tree = proto_item_add_subtree(vti, ett_bootp_option);
		for (i = 0; i < vlen; i++) {
			byte = pd[voff+2+i];
			if (byte < NUM_OPT_INFOS) {
				proto_tree_add_text(v_tree, NullTVB, voff+2+i, 1, "%d = %s",
						byte, opt[byte].text);
			} else {
				proto_tree_add_text(vti, NullTVB, voff+2+i, 1,
					"Unknown Option Code: %d", byte);
			}
		}
		break;

	case 61:	/* Client Identifier */
		/* We *MAY* use hwtype/hwaddr. If we have 7 bytes, I'll
		   guess that the first is the hwtype, and the last 6
		   are the hw addr */
		if (vlen == 7) {
			vti = proto_tree_add_text(bp_tree, NullTVB, voff,
				consumed, "Option %d: %s", code, text);
			v_tree = proto_item_add_subtree(vti, ett_bootp_option);
			proto_tree_add_text(v_tree, NullTVB, voff+2, 1,
				"Hardware type: %s",
				arphrdtype_to_str(pd[voff+2],
					"Unknown (0x%02x)"));
			proto_tree_add_text(v_tree, NullTVB, voff+3, 6,
				"Client hardware address: %s",
				arphrdaddr_to_str((guint8*)&pd[voff+3],
					6, pd[voff+2]));
		} else {
			/* otherwise, it's opaque data */
			proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
				"Option %d: %s (%d bytes)", code, text, vlen);
		}
		break;

	case 63:	/* NetWare/IP options */
		vti = proto_tree_add_text(bp_tree, NullTVB, voff,
		    consumed, "Option %d: %s", code, text);
		v_tree = proto_item_add_subtree(vti, ett_bootp_option);

		optp = voff+2;
		while (optp < voff+consumed)
			optp = dissect_netware_ip_suboption(v_tree, pd, optp);
		break;

	default:	/* not special */
		break;
	}

	/* Normal cases */
	if (code < NUM_OPT_INFOS) {
		text = opt[code].text;
		ftype = opt[code].ftype;

		switch (ftype) {

		case special:
			return consumed;

		case ipv4:
			if (vlen == 4) {
				/* one IP address */
				proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
					"Option %d: %s = %s", code, text,
					ip_to_str((guint8*)&pd[voff+2]));
			} else {
				/* > 1 IP addresses. Let's make a sub-tree */
				vti = proto_tree_add_text(bp_tree, NullTVB, voff,
					consumed, "Option %d: %s", code, text);
				v_tree = proto_item_add_subtree(vti, ett_bootp_option);
				for (i = voff + 2; i < voff + consumed; i += 4) {
					proto_tree_add_text(v_tree, NullTVB, i, 4, "IP Address: %s",
						ip_to_str((guint8*)&pd[i]));
				}
			}
			break;

		case string:
			/* Fix for non null-terminated string supplied by
			 * John Lines <John.Lines@aeat.co.uk>
			 */
			proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
					"Option %d: %s = %.*s", code, text, vlen, &pd[voff+2]);
			break;

		case opaque:
			proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
					"Option %d: %s (%d bytes)",
					code, text, vlen);
			break;

		case val_u_short:
			if (vlen == 2) {
				/* one u_short */
				proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
						"Option %d: %s = %d", code, text,
						pntohs(&pd[voff+2]));
			} else {
				/* > 1 u_short */
				vti = proto_tree_add_text(bp_tree, NullTVB, voff,
					consumed, "Option %d: %s", code, text);
				v_tree = proto_item_add_subtree(vti, ett_bootp_option);
				for (i = voff + 2; i < voff + consumed; i += 2) {
					proto_tree_add_text(v_tree, NullTVB, i, 4, "Value: %d",
						pntohs(&pd[i]));
				}
			}
			break;

		case val_u_long:
			proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
					"Option %d: %s = %d", code, text,
					pntohl(&pd[voff+2]));
			break;

		case val_u_byte:
			proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
					"Option %d: %s = %d", code, text, pd[voff+2]);
			break;

		case toggle:
			i = pd[voff+2];
			if (i != 0 && i != 1) {
				proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
						"Option %d: %s = Invalid Value %d", code, text,
						pd[voff+2]);
			} else {
				proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
						"Option %d: %s = %s", code, text,
						pd[voff+2] == 0 ? "Disabled" : "Enabled");
			}
			break;

		case yes_no:
			i = pd[voff+2];
			if (i != 0 && i != 1) {
				proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
						"Option %d: %s = Invalid Value %d", code, text,
						pd[voff+2]);
			} else {
				proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
						"Option %d: %s = %s", code, text,
						pd[voff+2] == 0 ? "No" : "Yes");
			}
			break;

		case time_in_secs:
			time_secs = pntohl(&pd[voff+2]);
			proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
				"Option %d: %s = %s", code, text,
				((time_secs == 0xffffffff) ?
				    "infinity" :
				    time_secs_to_str(time_secs)));
			break;

		default:
			proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
					"Option %d: %s (%d bytes)", code, text, vlen);
		}
	} else {
		proto_tree_add_text(bp_tree, NullTVB, voff, consumed,
				"Unknown Option Code: %d (%d bytes)", code, vlen);
	}

	return consumed;
}

static int
dissect_netware_ip_suboption(proto_tree *v_tree, const u_char *pd, int optp)
{
	int slask;
	proto_tree *o63_v_tree;
	proto_item *vti;

	struct o63_opt_info { 
		char	*truet;
		char 	*falset;
		enum field_type	ft;
	};

	static struct o63_opt_info o63_opt[]= {
		/* 0 */ {"","",none},
		/* 1 */ {"NWIP does not exist on subnet","",string},
		/* 2 */ {"NWIP exist in options area","",string},
		/* 3 */ {"NWIP exists in sname/file","",string},
		/* 4 */ {"NWIP exists, but too big","",string},
		/* 5 */ {"Broadcast for nearest Netware server","Do NOT Broadcast for nearest Netware server",yes_no}, 
		/* 6 */ {"Preferred DSS server","",ipv4},
		/* 7 */ {"Nearest NWIP server","",ipv4},
		/* 8 */ {"Autoretries","",val_u_short},
		/* 9 */ {"Autoretry delay, secs ","",val_u_short},
		/* 10*/ {"Support NetWare/IP v1.1","Do NOT support NetWare/IP v1.1",yes_no},
		/* 11*/ {"Primary DSS ", "" , special}
	};
		
	if (pd[optp] > NUM_O63_SUBOPTS) {
		proto_tree_add_text(v_tree, NullTVB,optp,1,"Unknown suboption %d", pd[optp]);
		optp++;
	} else {
		switch (o63_opt[pd[optp]].ft) {

		case string:
			proto_tree_add_text(v_tree, NullTVB, optp, 2, "Suboption %d: %s", pd[optp], o63_opt[pd[optp]].truet);
			optp+=2;
			break;

		case yes_no:
			if (pd[optp+2]==1) {
				proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s", pd[optp], o63_opt[pd[optp]].truet);
			} else {
				proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s" , pd[optp], o63_opt[pd[optp]].falset);
			}
			optp+=3;
			break;

		case special:	
			proto_tree_add_text(v_tree, NullTVB, optp, 6,
			    "Suboption %d: %s = %s" ,
			    pd[optp], o63_opt[pd[optp]].truet,
			    ip_to_str((guint8*)&pd[optp+2]));
			optp=optp+6;
			break;

		case val_u_short:
			proto_tree_add_text(v_tree, NullTVB, optp, 3, "Suboption %d: %s = %d",pd[optp], o63_opt[pd[optp]].truet, pd[optp+2]);
			optp+=3;
			break;
							
		case ipv4:
			if (pd[optp+1] == 4) {
				/* one IP address */
				proto_tree_add_text(v_tree, NullTVB, optp, 6,
				    "Suboption %d : %s = %s",
				    pd[optp], o63_opt[pd[optp]].truet,
				    ip_to_str((guint8*)&pd[optp+2]));
				optp=optp+6;
			} else {
				/* > 1 IP addresses. Let's make a sub-tree */
				vti = proto_tree_add_text(v_tree, NullTVB, optp,
				    pd[optp+1]+2, "Suboption %d: %s",
				    pd[optp], o63_opt[pd[optp]].truet);
				o63_v_tree = proto_item_add_subtree(vti, ett_bootp_option);
				for (slask = optp + 2 ; slask < optp+pd[optp+1]; slask += 4) {
					proto_tree_add_text(o63_v_tree, NullTVB, slask, 4, "IP Address: %s",
					ip_to_str((guint8*)&pd[slask]));
				}
				optp=slask;
			}
			break;
		default:
			proto_tree_add_text(v_tree, NullTVB,optp,1,"Unknown suboption %d", pd[optp]);
			optp++;
			break;
		}
	}
	return optp;
}

static void
dissect_bootp(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
{
	proto_tree	*bp_tree = NULL;
	proto_item	*ti;
	int		voff, eoff; /* vender offset, end offset */
	guint32		ip_addr;
	const char	*dhcp_type;

	OLD_CHECK_DISPLAY_AS_DATA(proto_bootp, pd, offset, fd, tree);

	dhcp_type = NULL;

	if (check_col(fd, COL_PROTOCOL))
		col_set_str(fd, COL_PROTOCOL, "BOOTP");

	if (check_col(fd, COL_INFO)) {
		if (pd[offset] == 1) {
			col_add_fstr(fd, COL_INFO, "Boot Request from %s",
				arphrdaddr_to_str((guint8*)&pd[offset+28],
					pd[offset+2], pd[offset+1]));
		}
		else {
			col_set_str(fd, COL_INFO, "Boot Reply");
		}
	}

	if (tree) {
		ti = proto_tree_add_item(tree, proto_bootp, NullTVB, offset, END_OF_FRAME, FALSE);
		bp_tree = proto_item_add_subtree(ti, ett_bootp);

		proto_tree_add_uint_format(bp_tree, hf_bootp_type, NullTVB, 
					   offset, 1,
					   pd[offset], 
					   pd[offset] == 1 ?
					   "Boot Request" : "Boot Reply");
		proto_tree_add_uint_format(bp_tree, hf_bootp_hw_type, NullTVB,
					   offset + 1, 1,
					   pd[offset+1],
					   "Hardware type: %s",
					   arphrdtype_to_str(pd[offset+1],
							     "Unknown (0x%02x)"));
		proto_tree_add_uint(bp_tree, hf_bootp_hw_len, NullTVB,
				    offset + 2, 1, pd[offset+2]);
		proto_tree_add_uint(bp_tree, hf_bootp_hops, NullTVB,
				    offset + 3, 1, pd[offset+3]);
		proto_tree_add_uint(bp_tree, hf_bootp_id, NullTVB,
				   offset + 4, 4, pntohl(&pd[offset+4]));
		proto_tree_add_uint(bp_tree, hf_bootp_secs, NullTVB,
				    offset + 8, 2, pntohs(&pd[offset+8]));
		proto_tree_add_uint(bp_tree, hf_bootp_flag, NullTVB,
				    offset + 10, 2, pntohs(&pd[offset+10]) & 0x8000);

		memcpy(&ip_addr, &pd[offset+12], sizeof(ip_addr));
		proto_tree_add_ipv4(bp_tree, hf_bootp_ip_client, NullTVB, 
				    offset + 12, 4, ip_addr);
		memcpy(&ip_addr, &pd[offset+16], sizeof(ip_addr));
		proto_tree_add_ipv4(bp_tree, hf_bootp_ip_your, NullTVB, 
				    offset + 16, 4, ip_addr);
		memcpy(&ip_addr, &pd[offset+20], sizeof(ip_addr));
		proto_tree_add_ipv4(bp_tree, hf_bootp_ip_server, NullTVB,
				    offset + 20, 4, ip_addr);
		memcpy(&ip_addr, &pd[offset+24], sizeof(ip_addr));
		proto_tree_add_ipv4(bp_tree, hf_bootp_ip_relay, NullTVB,
				    offset + 24, 4, ip_addr);

		if (pd[offset+2] > 0) {
			proto_tree_add_bytes_format(bp_tree, hf_bootp_hw_addr, NullTVB, 
						   offset + 28, pd[offset+2],
						   &pd[offset+28],
						   "Client hardware address: %s",
						   arphrdaddr_to_str((guint8*)&pd[offset+28],
								     pd[offset+2], pd[offset+1]));
		}
		else {
			proto_tree_add_text(bp_tree,  NullTVB, 
						   offset + 28, 0, "Client address not given");
		}

		/* The server host name is optional */
		if (pd[offset+44]) {
			proto_tree_add_string_format(bp_tree, hf_bootp_server, NullTVB,
						   offset + 44, 64,
						   &pd[offset+44],
						   "Server host name: %s",
						   &pd[offset+44]);
		}
		else {
			proto_tree_add_string_format(bp_tree, hf_bootp_server, NullTVB,
						   offset + 44, 64,
						   &pd[offset+44],
						   "Server host name not given");
		}

		/* Boot file */
		if (pd[offset+108]) {
			proto_tree_add_string_format(bp_tree, hf_bootp_file, NullTVB,
						   offset + 108, 128,
						   &pd[offset+108],
						   "Boot file name: %s",
						   &pd[offset+108]);
		}
		else {
			proto_tree_add_string_format(bp_tree, hf_bootp_file, NullTVB,
						   offset + 108, 128,
						   &pd[offset+108],
						   "Boot file name not given");
		}

		memcpy(&ip_addr, &pd[offset + 236], sizeof(ip_addr));
		if (pntohl(&pd[offset+236]) == 0x63825363) {
			proto_tree_add_ipv4_format(bp_tree, hf_bootp_cookie, NullTVB,
					    offset + 236, 4, ip_addr,
					    "Magic cookie: (OK)");
		}
		else {
			proto_tree_add_ipv4(bp_tree, hf_bootp_cookie, NullTVB,
					    offset + 236, 4, ip_addr);
		}
	}

	voff = offset+240;
	eoff = pi.captured_len;
	while (voff < eoff) {
		/* Handle the DHCP option specially here, so that we
		   can flag DHCP packets as such. */
		if (pd[voff] == 53)
			dhcp_type = get_dhcp_type(pd[voff+2]);
		voff += bootp_option(pd, bp_tree, voff, eoff);
	}
	if (dhcp_type != NULL ) {
		if (check_col(fd, COL_PROTOCOL))
			col_set_str(fd, COL_PROTOCOL, "DHCP");
		if (check_col(fd, COL_INFO))
			col_add_fstr(fd, COL_INFO, "DHCP %-8s - Transaction ID 0x%x",
			    dhcp_type, pntohl(&pd[offset+4]));
		if (tree)
			proto_tree_add_boolean_hidden(bp_tree, hf_bootp_dhcp,
			    NullTVB, 0, 0, 1);
	}
}

void
proto_register_bootp(void)
{
  static hf_register_info hf[] = {
    { &hf_bootp_dhcp,
      { "Frame is DHCP",                "bootp.dhcp",    FT_BOOLEAN,  BASE_NONE, NULL, 0x0,
        "" }},                            
                      
    { &hf_bootp_type,
      { "Message type",			"bootp.type",	 FT_UINT8,  BASE_NONE, NULL, 0x0,
      	"" }},

    { &hf_bootp_hw_type,
      { "Hardware type",	       	"bootp.hw.type", FT_UINT8,  BASE_HEX, NULL, 0x0,
      	"" }},

    { &hf_bootp_hw_len,
      { "Hardware address length",	"bootp.hw.len",  FT_UINT8,  BASE_DEC, NULL, 0x0,
      	"" }},

    { &hf_bootp_hops,
      { "Hops",			       	"bootp.hops",	 FT_UINT8,  BASE_DEC, NULL, 0x0,
      	"" }},

    { &hf_bootp_id,
      { "Transaction ID",	       	"bootp.id",	 FT_UINT32, BASE_HEX, NULL, 0x0,
      	"" }},

    { &hf_bootp_secs,
      { "Seconds elapsed",	       	"bootp.secs",	 FT_UINT16, BASE_DEC, NULL, 0x0,
      	"" }},

    { &hf_bootp_flag,
      { "Broadcast flag",	       	"bootp.flag",    FT_UINT16, BASE_HEX, NULL, 0x0,
      	"" }},

    { &hf_bootp_ip_client,
      { "Client IP address",	       	"bootp.ip.client",FT_IPv4,  BASE_NONE, NULL, 0x0,
      	"" }},

    { &hf_bootp_ip_your,
      { "Your (client) IP address",	"bootp.ip.your",  FT_IPv4,  BASE_NONE, NULL, 0x0,
      	"" }},

    { &hf_bootp_ip_server,
      { "Next server IP address",	"bootp.ip.server",FT_IPv4,  BASE_NONE, NULL, 0x0,
      	"" }},

    { &hf_bootp_ip_relay,
      { "Relay agent IP address",	"bootp.ip.relay", FT_IPv4,  BASE_NONE, NULL, 0x0,
      	"" }},

    { &hf_bootp_hw_addr,
      { "Client hardware address",	"bootp.hw.addr", FT_BYTES,  BASE_NONE, NULL, 0x0,
      	"" }},

    { &hf_bootp_server,
      { "Server host name",		"bootp.server",  FT_STRING, BASE_NONE, NULL, 0x0,
      	"" }},

    { &hf_bootp_file,
      { "Boot file name",		"bootp.file",	 FT_STRING, BASE_NONE, NULL, 0x0,
      	"" }},

    { &hf_bootp_cookie,
      { "Magic cookie",			"bootp.cookie",	 FT_IPv4,   BASE_NONE, NULL, 0x0,
      	"" }},
  };
  static gint *ett[] = {
    &ett_bootp,
    &ett_bootp_option,
  };
  
  proto_bootp = proto_register_protocol("Bootstrap Protocol", "bootp");
  proto_register_field_array(proto_bootp, hf, array_length(hf));
  proto_register_subtree_array(ett, array_length(ett));
}

void
proto_reg_handoff_bootp(void)
{
  old_dissector_add("udp.port", UDP_PORT_BOOTPS, dissect_bootp);
}