print-egp.c revision 111726 
1/*
2 * Copyright (c) 1991, 1992, 1993, 1994, 1995, 1996
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms are permitted
6 * provided that the above copyright notice and this paragraph are
7 * duplicated in all such forms and that any documentation,
8 * advertising materials, and other materials related to such
9 * distribution and use acknowledge that the software was developed
10 * by the University of California, Lawrence Berkeley Laboratory,
11 * Berkeley, CA.  The name of the University may not be used to
12 * endorse or promote products derived from this software without
13 * specific prior written permission.
14 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
15 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
16 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
17 *
18 * Initial contribution from Jeff Honig (jch@MITCHELL.CIT.CORNELL.EDU).
19 */
20
21#ifndef lint
22static const char rcsid[] =
23    "@(#) $Header: /tcpdump/master/tcpdump/print-egp.c,v 1.28.4.1 2002/06/01 23:51:12 guy Exp $ (LBL)";
24#endif
25
26#ifdef HAVE_CONFIG_H
27#include "config.h"
28#endif
29
30#include <sys/param.h>
31#include <sys/time.h>
32#include <sys/socket.h>
33
34#include <netinet/in.h>
35
36#include <netdb.h>
37#include <stdio.h>
38
39#include "interface.h"
40#include "addrtoname.h"
41
42#include "ip.h"
43
44struct egp_packet {
45	u_char  egp_version;
46#define	EGP_VERSION	2
47	u_char  egp_type;
48#define  EGPT_ACQUIRE	3
49#define  EGPT_REACH	5
50#define  EGPT_POLL	2
51#define  EGPT_UPDATE	1
52#define  EGPT_ERROR	8
53	u_char  egp_code;
54#define  EGPC_REQUEST	0
55#define  EGPC_CONFIRM	1
56#define  EGPC_REFUSE	2
57#define  EGPC_CEASE	3
58#define  EGPC_CEASEACK	4
59#define  EGPC_HELLO	0
60#define  EGPC_HEARDU	1
61	u_char  egp_status;
62#define  EGPS_UNSPEC	0
63#define  EGPS_ACTIVE	1
64#define  EGPS_PASSIVE	2
65#define  EGPS_NORES	3
66#define  EGPS_ADMIN	4
67#define  EGPS_GODOWN	5
68#define  EGPS_PARAM	6
69#define  EGPS_PROTO	7
70#define  EGPS_INDET	0
71#define  EGPS_UP	1
72#define  EGPS_DOWN	2
73#define  EGPS_UNSOL	0x80
74	u_short  egp_checksum;
75	u_short  egp_as;
76	u_short  egp_sequence;
77	union {
78		u_short  egpu_hello;
79		u_char egpu_gws[2];
80		u_short  egpu_reason;
81#define  EGPR_UNSPEC	0
82#define  EGPR_BADHEAD	1
83#define  EGPR_BADDATA	2
84#define  EGPR_NOREACH	3
85#define  EGPR_XSPOLL	4
86#define  EGPR_NORESP	5
87#define  EGPR_UVERSION	6
88	} egp_handg;
89#define  egp_hello  egp_handg.egpu_hello
90#define  egp_intgw  egp_handg.egpu_gws[0]
91#define  egp_extgw  egp_handg.egpu_gws[1]
92#define  egp_reason  egp_handg.egpu_reason
93	union {
94		u_short  egpu_poll;
95		u_int32_t egpu_sourcenet;
96	} egp_pands;
97#define  egp_poll  egp_pands.egpu_poll
98#define  egp_sourcenet  egp_pands.egpu_sourcenet
99};
100
101const char *egp_acquire_codes[] = {
102	"request",
103	"confirm",
104	"refuse",
105	"cease",
106	"cease_ack"
107};
108
109const char *egp_acquire_status[] = {
110	"unspecified",
111	"active_mode",
112	"passive_mode",
113	"insufficient_resources",
114	"administratively_prohibited",
115	"going_down",
116	"parameter_violation",
117	"protocol_violation"
118};
119
120const char *egp_reach_codes[] = {
121	"hello",
122	"i-h-u"
123};
124
125const char *egp_status_updown[] = {
126	"indeterminate",
127	"up",
128	"down"
129};
130
131const char *egp_reasons[] = {
132	"unspecified",
133	"bad_EGP_header_format",
134	"bad_EGP_data_field_format",
135	"reachability_info_unavailable",
136	"excessive_polling_rate",
137	"no_response",
138	"unsupported_version"
139};
140
141static void
142egpnrprint(register const struct egp_packet *egp, register u_int length)
143{
144	register const u_char *cp;
145	u_int32_t addr;
146	register u_int32_t net;
147	register u_int netlen;
148	int gateways, distances, networks;
149	int t_gateways;
150	char *comma;
151
152	addr = egp->egp_sourcenet;
153	if (IN_CLASSA(addr)) {
154		net = addr & IN_CLASSA_NET;
155		netlen = 1;
156	} else if (IN_CLASSB(addr)) {
157		net = addr & IN_CLASSB_NET;
158		netlen = 2;
159	} else if (IN_CLASSC(addr)) {
160		net = addr & IN_CLASSC_NET;
161		netlen = 3;
162	} else {
163		net = 0;
164		netlen = 0;
165	}
166	cp = (u_char *)(egp + 1);
167
168	t_gateways = egp->egp_intgw + egp->egp_extgw;
169	for (gateways = 0; gateways < t_gateways; ++gateways) {
170		/* Pickup host part of gateway address */
171		addr = 0;
172		TCHECK2(cp[0], 4 - netlen);
173		switch (netlen) {
174
175		case 1:
176			addr = *cp++;
177			/* fall through */
178		case 2:
179			addr = (addr << 8) | *cp++;
180			/* fall through */
181		case 3:
182			addr = (addr << 8) | *cp++;
183		}
184		addr |= net;
185		TCHECK2(cp[0], 1);
186		distances = *cp++;
187		printf(" %s %s ",
188		       gateways < (int)egp->egp_intgw ? "int" : "ext",
189		       ipaddr_string(&addr));
190
191		comma = "";
192		putchar('(');
193		while (--distances >= 0) {
194			TCHECK2(cp[0], 2);
195			printf("%sd%d:", comma, (int)*cp++);
196			comma = ", ";
197			networks = *cp++;
198			while (--networks >= 0) {
199				/* Pickup network number */
200				TCHECK2(cp[0], 1);
201				addr = (u_int32_t)*cp++ << 24;
202				if (IN_CLASSB(addr)) {
203					TCHECK2(cp[0], 1);
204					addr |= (u_int32_t)*cp++ << 16;
205				} else if (!IN_CLASSA(addr)) {
206					TCHECK2(cp[0], 2);
207					addr |= (u_int32_t)*cp++ << 16;
208					addr |= (u_int32_t)*cp++ << 8;
209				}
210				printf(" %s", ipaddr_string(&addr));
211			}
212		}
213		putchar(')');
214	}
215	return;
216trunc:
217	fputs("[|]", stdout);
218}
219
220void
221egp_print(register const u_char *bp, register u_int length,
222	  register const u_char *bp2)
223{
224	register const struct egp_packet *egp;
225	register const struct ip *ip;
226	register int status;
227	register int code;
228	register int type;
229
230	egp = (struct egp_packet *)bp;
231	ip = (struct ip *)bp2;
232	(void)printf("egp: ");
233
234	if (egp->egp_version != EGP_VERSION) {
235		printf("[version %d]", egp->egp_version);
236		return;
237	}
238	printf("as:%d seq:%d", ntohs(egp->egp_as), ntohs(egp->egp_sequence));
239
240	type = egp->egp_type;
241	code = egp->egp_code;
242	status = egp->egp_status;
243
244	switch (type) {
245	case EGPT_ACQUIRE:
246		printf(" acquire");
247		switch (code) {
248		case EGPC_REQUEST:
249		case EGPC_CONFIRM:
250			printf(" %s", egp_acquire_codes[code]);
251			switch (status) {
252			case EGPS_UNSPEC:
253			case EGPS_ACTIVE:
254			case EGPS_PASSIVE:
255				printf(" %s", egp_acquire_status[status]);
256				break;
257
258			default:
259				printf(" [status %d]", status);
260				break;
261			}
262			printf(" hello:%d poll:%d",
263			       ntohs(egp->egp_hello),
264			       ntohs(egp->egp_poll));
265			break;
266
267		case EGPC_REFUSE:
268		case EGPC_CEASE:
269		case EGPC_CEASEACK:
270			printf(" %s", egp_acquire_codes[code]);
271			switch (status ) {
272			case EGPS_UNSPEC:
273			case EGPS_NORES:
274			case EGPS_ADMIN:
275			case EGPS_GODOWN:
276			case EGPS_PARAM:
277			case EGPS_PROTO:
278				printf(" %s", egp_acquire_status[status]);
279				break;
280
281			default:
282				printf("[status %d]", status);
283				break;
284			}
285			break;
286
287		default:
288			printf("[code %d]", code);
289			break;
290		}
291		break;
292
293	case EGPT_REACH:
294		switch (code) {
295
296		case EGPC_HELLO:
297		case EGPC_HEARDU:
298			printf(" %s", egp_reach_codes[code]);
299			if (status <= EGPS_DOWN)
300				printf(" state:%s", egp_status_updown[status]);
301			else
302				printf(" [status %d]", status);
303			break;
304
305		default:
306			printf("[reach code %d]", code);
307			break;
308		}
309		break;
310
311	case EGPT_POLL:
312		printf(" poll");
313		if (egp->egp_status <= EGPS_DOWN)
314			printf(" state:%s", egp_status_updown[status]);
315		else
316			printf(" [status %d]", status);
317		printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
318		break;
319
320	case EGPT_UPDATE:
321		printf(" update");
322		if (status & EGPS_UNSOL) {
323			status &= ~EGPS_UNSOL;
324			printf(" unsolicited");
325		}
326		if (status <= EGPS_DOWN)
327			printf(" state:%s", egp_status_updown[status]);
328		else
329			printf(" [status %d]", status);
330		printf(" %s int %d ext %d",
331		       ipaddr_string(&egp->egp_sourcenet),
332		       egp->egp_intgw,
333		       egp->egp_extgw);
334		if (vflag)
335			egpnrprint(egp, length);
336		break;
337
338	case EGPT_ERROR:
339		printf(" error");
340		if (status <= EGPS_DOWN)
341			printf(" state:%s", egp_status_updown[status]);
342		else
343			printf(" [status %d]", status);
344
345		if (ntohs(egp->egp_reason) <= EGPR_UVERSION)
346			printf(" %s", egp_reasons[ntohs(egp->egp_reason)]);
347		else
348			printf(" [reason %d]", ntohs(egp->egp_reason));
349		break;
350
351	default:
352		printf("[type %d]", type);
353		break;
354	}
355}
356