summaryrefslogtreecommitdiff
path: root/print-egp.c
blob: 4a1d046531be37a9bcc8ac2b0426e98ce426963c (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
/*
 * Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms are permitted
 * provided that the above copyright notice and this paragraph are
 * duplicated in all such forms and that any documentation,
 * advertising materials, and other materials related to such
 * distribution and use acknowledge that the software was developed
 * by the University of California, Lawrence Berkeley Laboratory,
 * Berkeley, CA.  The name of the University may not be used to
 * endorse or promote products derived from this software without
 * specific prior written permission.
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
 *
 * Initial contribution from Jeff Honig (jch@MITCHELL.CIT.CORNELL.EDU).
 */

#ifndef lint
static const char rcsid[] _U_ =
    "@(#) $Header: /tcpdump/master/tcpdump/print-egp.c,v 1.38 2006-02-11 22:13:24 hannes Exp $ (LBL)";
#endif

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

#include <tcpdump-stdinc.h>

#include <stdio.h>

#include "interface.h"
#include "addrtoname.h"
#include "extract.h"

#include "ip.h"

struct egp_packet {
	u_int8_t  egp_version;
#define	EGP_VERSION	2
	u_int8_t  egp_type;
#define  EGPT_ACQUIRE	3
#define  EGPT_REACH	5
#define  EGPT_POLL	2
#define  EGPT_UPDATE	1
#define  EGPT_ERROR	8
	u_int8_t  egp_code;
#define  EGPC_REQUEST	0
#define  EGPC_CONFIRM	1
#define  EGPC_REFUSE	2
#define  EGPC_CEASE	3
#define  EGPC_CEASEACK	4
#define  EGPC_HELLO	0
#define  EGPC_HEARDU	1
	u_int8_t  egp_status;
#define  EGPS_UNSPEC	0
#define  EGPS_ACTIVE	1
#define  EGPS_PASSIVE	2
#define  EGPS_NORES	3
#define  EGPS_ADMIN	4
#define  EGPS_GODOWN	5
#define  EGPS_PARAM	6
#define  EGPS_PROTO	7
#define  EGPS_INDET	0
#define  EGPS_UP	1
#define  EGPS_DOWN	2
#define  EGPS_UNSOL	0x80
	u_int16_t  egp_checksum;
	u_int16_t  egp_as;
	u_int16_t  egp_sequence;
	union {
		u_int16_t  egpu_hello;
		u_int8_t egpu_gws[2];
		u_int16_t  egpu_reason;
#define  EGPR_UNSPEC	0
#define  EGPR_BADHEAD	1
#define  EGPR_BADDATA	2
#define  EGPR_NOREACH	3
#define  EGPR_XSPOLL	4
#define  EGPR_NORESP	5
#define  EGPR_UVERSION	6
	} egp_handg;
#define  egp_hello  egp_handg.egpu_hello
#define  egp_intgw  egp_handg.egpu_gws[0]
#define  egp_extgw  egp_handg.egpu_gws[1]
#define  egp_reason  egp_handg.egpu_reason
	union {
		u_int16_t  egpu_poll;
		u_int32_t egpu_sourcenet;
	} egp_pands;
#define  egp_poll  egp_pands.egpu_poll
#define  egp_sourcenet  egp_pands.egpu_sourcenet
};

const char *egp_acquire_codes[] = {
	"request",
	"confirm",
	"refuse",
	"cease",
	"cease_ack"
};

const char *egp_acquire_status[] = {
	"unspecified",
	"active_mode",
	"passive_mode",
	"insufficient_resources",
	"administratively_prohibited",
	"going_down",
	"parameter_violation",
	"protocol_violation"
};

const char *egp_reach_codes[] = {
	"hello",
	"i-h-u"
};

const char *egp_status_updown[] = {
	"indeterminate",
	"up",
	"down"
};

const char *egp_reasons[] = {
	"unspecified",
	"bad_EGP_header_format",
	"bad_EGP_data_field_format",
	"reachability_info_unavailable",
	"excessive_polling_rate",
	"no_response",
	"unsupported_version"
};

static void
egpnrprint(register const struct egp_packet *egp)
{
	register const u_int8_t *cp;
	u_int32_t addr;
	register u_int32_t net;
	register u_int netlen;
	int gateways, distances, networks;
	int t_gateways;
	const char *comma;

	addr = egp->egp_sourcenet;
	if (IN_CLASSA(addr)) {
		net = addr & IN_CLASSA_NET;
		netlen = 1;
	} else if (IN_CLASSB(addr)) {
		net = addr & IN_CLASSB_NET;
		netlen = 2;
	} else if (IN_CLASSC(addr)) {
		net = addr & IN_CLASSC_NET;
		netlen = 3;
	} else {
		net = 0;
		netlen = 0;
	}
	cp = (u_int8_t *)(egp + 1);

	t_gateways = egp->egp_intgw + egp->egp_extgw;
	for (gateways = 0; gateways < t_gateways; ++gateways) {
		/* Pickup host part of gateway address */
		addr = 0;
		TCHECK2(cp[0], 4 - netlen);
		switch (netlen) {

		case 1:
			addr = *cp++;
			/* fall through */
		case 2:
			addr = (addr << 8) | *cp++;
			/* fall through */
		case 3:
			addr = (addr << 8) | *cp++;
		}
		addr |= net;
		TCHECK2(cp[0], 1);
		distances = *cp++;
		printf(" %s %s ",
		       gateways < (int)egp->egp_intgw ? "int" : "ext",
		       ipaddr_string(&addr));

		comma = "";
		putchar('(');
		while (--distances >= 0) {
			TCHECK2(cp[0], 2);
			printf("%sd%d:", comma, (int)*cp++);
			comma = ", ";
			networks = *cp++;
			while (--networks >= 0) {
				/* Pickup network number */
				TCHECK2(cp[0], 1);
				addr = (u_int32_t)*cp++ << 24;
				if (IN_CLASSB(addr)) {
					TCHECK2(cp[0], 1);
					addr |= (u_int32_t)*cp++ << 16;
				} else if (!IN_CLASSA(addr)) {
					TCHECK2(cp[0], 2);
					addr |= (u_int32_t)*cp++ << 16;
					addr |= (u_int32_t)*cp++ << 8;
				}
				printf(" %s", ipaddr_string(&addr));
			}
		}
		putchar(')');
	}
	return;
trunc:
	fputs("[|]", stdout);
}

void
egp_print(register const u_int8_t *bp, register u_int length)
{
	register const struct egp_packet *egp;
	register int status;
	register int code;
	register int type;

	egp = (struct egp_packet *)bp;
        if (!TTEST2(*egp, length)) {
		printf("[|egp]");
		return;
	}

        if (!vflag) {
            printf("EGPv%u, AS %u, seq %u, length %u",
                   egp->egp_version,
                   EXTRACT_16BITS(&egp->egp_as),
                   EXTRACT_16BITS(&egp->egp_sequence),
                   length);
            return;
        } else
            printf("EGPv%u, length %u",
                   egp->egp_version,
                   length);            

	if (egp->egp_version != EGP_VERSION) {
		printf("[version %d]", egp->egp_version);
		return;
	}

	type = egp->egp_type;
	code = egp->egp_code;
	status = egp->egp_status;

	switch (type) {
	case EGPT_ACQUIRE:
		printf(" acquire");
		switch (code) {
		case EGPC_REQUEST:
		case EGPC_CONFIRM:
			printf(" %s", egp_acquire_codes[code]);
			switch (status) {
			case EGPS_UNSPEC:
			case EGPS_ACTIVE:
			case EGPS_PASSIVE:
				printf(" %s", egp_acquire_status[status]);
				break;

			default:
				printf(" [status %d]", status);
				break;
			}
			printf(" hello:%d poll:%d",
			       EXTRACT_16BITS(&egp->egp_hello),
			       EXTRACT_16BITS(&egp->egp_poll));
			break;

		case EGPC_REFUSE:
		case EGPC_CEASE:
		case EGPC_CEASEACK:
			printf(" %s", egp_acquire_codes[code]);
			switch (status ) {
			case EGPS_UNSPEC:
			case EGPS_NORES:
			case EGPS_ADMIN:
			case EGPS_GODOWN:
			case EGPS_PARAM:
			case EGPS_PROTO:
				printf(" %s", egp_acquire_status[status]);
				break;

			default:
				printf("[status %d]", status);
				break;
			}
			break;

		default:
			printf("[code %d]", code);
			break;
		}
		break;

	case EGPT_REACH:
		switch (code) {

		case EGPC_HELLO:
		case EGPC_HEARDU:
			printf(" %s", egp_reach_codes[code]);
			if (status <= EGPS_DOWN)
				printf(" state:%s", egp_status_updown[status]);
			else
				printf(" [status %d]", status);
			break;

		default:
			printf("[reach code %d]", code);
			break;
		}
		break;

	case EGPT_POLL:
		printf(" poll");
		if (egp->egp_status <= EGPS_DOWN)
			printf(" state:%s", egp_status_updown[status]);
		else
			printf(" [status %d]", status);
		printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
		break;

	case EGPT_UPDATE:
		printf(" update");
		if (status & EGPS_UNSOL) {
			status &= ~EGPS_UNSOL;
			printf(" unsolicited");
		}
		if (status <= EGPS_DOWN)
			printf(" state:%s", egp_status_updown[status]);
		else
			printf(" [status %d]", status);
		printf(" %s int %d ext %d",
		       ipaddr_string(&egp->egp_sourcenet),
		       egp->egp_intgw,
		       egp->egp_extgw);
		if (vflag)
			egpnrprint(egp);
		break;

	case EGPT_ERROR:
		printf(" error");
		if (status <= EGPS_DOWN)
			printf(" state:%s", egp_status_updown[status]);
		else
			printf(" [status %d]", status);

		if (EXTRACT_16BITS(&egp->egp_reason) <= EGPR_UVERSION)
			printf(" %s", egp_reasons[EXTRACT_16BITS(&egp->egp_reason)]);
		else
			printf(" [reason %d]", EXTRACT_16BITS(&egp->egp_reason));
		break;

	default:
		printf("[type %d]", type);
		break;
	}
}