print-egp.c revision 56893 
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 1.24 1999/11/21 09:36:51 fenner 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/uio.h>
33#include <sys/socket.h>
34
35#include <netinet/in.h>
36#include <netinet/in_systm.h>
37#include <netinet/ip.h>
38
39#include <netdb.h>
40#include <stdio.h>
41
42#include "interface.h"
43#include "addrtoname.h"
44
45struct egp_packet {
46	u_char  egp_version;
47#define	EGP_VERSION	2
48	u_char  egp_type;
49#define  EGPT_ACQUIRE	3
50#define  EGPT_REACH	5
51#define  EGPT_POLL	2
52#define  EGPT_UPDATE	1
53#define  EGPT_ERROR	8
54	u_char  egp_code;
55#define  EGPC_REQUEST	0
56#define  EGPC_CONFIRM	1
57#define  EGPC_REFUSE	2
58#define  EGPC_CEASE	3
59#define  EGPC_CEASEACK	4
60#define  EGPC_HELLO	0
61#define  EGPC_HEARDU	1
62	u_char  egp_status;
63#define  EGPS_UNSPEC	0
64#define  EGPS_ACTIVE	1
65#define  EGPS_PASSIVE	2
66#define  EGPS_NORES	3
67#define  EGPS_ADMIN	4
68#define  EGPS_GODOWN	5
69#define  EGPS_PARAM	6
70#define  EGPS_PROTO	7
71#define  EGPS_INDET	0
72#define  EGPS_UP	1
73#define  EGPS_DOWN	2
74#define  EGPS_UNSOL	0x80
75	u_short  egp_checksum;
76	u_short  egp_as;
77	u_short  egp_sequence;
78	union {
79		u_short  egpu_hello;
80		u_char egpu_gws[2];
81		u_short  egpu_reason;
82#define  EGPR_UNSPEC	0
83#define  EGPR_BADHEAD	1
84#define  EGPR_BADDATA	2
85#define  EGPR_NOREACH	3
86#define  EGPR_XSPOLL	4
87#define  EGPR_NORESP	5
88#define  EGPR_UVERSION	6
89	} egp_handg;
90#define  egp_hello  egp_handg.egpu_hello
91#define  egp_intgw  egp_handg.egpu_gws[0]
92#define  egp_extgw  egp_handg.egpu_gws[1]
93#define  egp_reason  egp_handg.egpu_reason
94	union {
95		u_short  egpu_poll;
96		u_int32_t egpu_sourcenet;
97	} egp_pands;
98#define  egp_poll  egp_pands.egpu_poll
99#define  egp_sourcenet  egp_pands.egpu_sourcenet
100};
101
102char *egp_acquire_codes[] = {
103	"request",
104	"confirm",
105	"refuse",
106	"cease",
107	"cease_ack"
108};
109
110char *egp_acquire_status[] = {
111	"unspecified",
112	"active_mode",
113	"passive_mode",
114	"insufficient_resources",
115	"administratively_prohibited",
116	"going_down",
117	"parameter_violation",
118	"protocol_violation"
119};
120
121char *egp_reach_codes[] = {
122	"hello",
123	"i-h-u"
124};
125
126char *egp_status_updown[] = {
127	"indeterminate",
128	"up",
129	"down"
130};
131
132char *egp_reasons[] = {
133	"unspecified",
134	"bad_EGP_header_format",
135	"bad_EGP_data_field_format",
136	"reachability_info_unavailable",
137	"excessive_polling_rate",
138	"no_response",
139	"unsupported_version"
140};
141
142static void
143egpnrprint(register const struct egp_packet *egp, register u_int length)
144{
145	register const u_char *cp;
146	u_int32_t addr;
147	register u_int32_t net;
148	register u_int netlen;
149	int gateways, distances, networks;
150	int t_gateways;
151	char *comma;
152
153	addr = egp->egp_sourcenet;
154	if (IN_CLASSA(addr)) {
155		net = addr & IN_CLASSA_NET;
156		netlen = 1;
157	} else if (IN_CLASSB(addr)) {
158		net = addr & IN_CLASSB_NET;
159		netlen = 2;
160	} else if (IN_CLASSC(addr)) {
161		net = addr & IN_CLASSC_NET;
162		netlen = 3;
163	} else {
164		net = 0;
165		netlen = 0;
166	}
167	cp = (u_char *)(egp + 1);
168
169	t_gateways = egp->egp_intgw + egp->egp_extgw;
170	for (gateways = 0; gateways < t_gateways; ++gateways) {
171		/* Pickup host part of gateway address */
172		addr = 0;
173		TCHECK2(cp[0], 4 - netlen);
174		switch (netlen) {
175
176		case 1:
177			addr = *cp++;
178			/* fall through */
179		case 2:
180			addr = (addr << 8) | *cp++;
181			/* fall through */
182		case 3:
183			addr = (addr << 8) | *cp++;
184		}
185		addr |= net;
186		TCHECK2(cp[0], 1);
187		distances = *cp++;
188		printf(" %s %s ",
189		       gateways < (int)egp->egp_intgw ? "int" : "ext",
190		       ipaddr_string(&addr));
191
192		comma = "";
193		putchar('(');
194		while (--distances >= 0) {
195			TCHECK2(cp[0], 2);
196			printf("%sd%d:", comma, (int)*cp++);
197			comma = ", ";
198			networks = *cp++;
199			while (--networks >= 0) {
200				/* Pickup network number */
201				TCHECK2(cp[0], 1);
202				addr = (u_int32_t)*cp++ << 24;
203				if (IN_CLASSB(addr)) {
204					TCHECK2(cp[0], 1);
205					addr |= (u_int32_t)*cp++ << 16;
206				} else if (!IN_CLASSA(addr)) {
207					TCHECK2(cp[0], 2);
208					addr |= (u_int32_t)*cp++ << 16;
209					addr |= (u_int32_t)*cp++ << 8;
210				}
211				printf(" %s", ipaddr_string(&addr));
212			}
213		}
214		putchar(')');
215	}
216	return;
217trunc:
218	fputs("[|]", stdout);
219}
220
221void
222egp_print(register const u_char *bp, register u_int length,
223	  register const u_char *bp2)
224{
225	register const struct egp_packet *egp;
226	register const struct ip *ip;
227	register int status;
228	register int code;
229	register int type;
230
231	egp = (struct egp_packet *)bp;
232	ip = (struct ip *)bp2;
233        (void)printf("%s > %s: egp: ",
234		     ipaddr_string(&ip->ip_src),
235		     ipaddr_string(&ip->ip_dst));
236
237	if (egp->egp_version != EGP_VERSION) {
238		printf("[version %d]", egp->egp_version);
239		return;
240	}
241	printf("as:%d seq:%d", ntohs(egp->egp_as), ntohs(egp->egp_sequence));
242
243	type = egp->egp_type;
244	code = egp->egp_code;
245	status = egp->egp_status;
246
247	switch (type) {
248	case EGPT_ACQUIRE:
249		printf(" acquire");
250		switch (code) {
251		case EGPC_REQUEST:
252		case EGPC_CONFIRM:
253			printf(" %s", egp_acquire_codes[code]);
254			switch (status) {
255			case EGPS_UNSPEC:
256			case EGPS_ACTIVE:
257			case EGPS_PASSIVE:
258				printf(" %s", egp_acquire_status[status]);
259				break;
260
261			default:
262				printf(" [status %d]", status);
263				break;
264			}
265			printf(" hello:%d poll:%d",
266			       ntohs(egp->egp_hello),
267			       ntohs(egp->egp_poll));
268			break;
269
270		case EGPC_REFUSE:
271		case EGPC_CEASE:
272		case EGPC_CEASEACK:
273			printf(" %s", egp_acquire_codes[code]);
274			switch (status ) {
275			case EGPS_UNSPEC:
276			case EGPS_NORES:
277			case EGPS_ADMIN:
278			case EGPS_GODOWN:
279			case EGPS_PARAM:
280			case EGPS_PROTO:
281				printf(" %s", egp_acquire_status[status]);
282				break;
283
284			default:
285				printf("[status %d]", status);
286				break;
287			}
288			break;
289
290		default:
291			printf("[code %d]", code);
292			break;
293		}
294		break;
295
296	case EGPT_REACH:
297		switch (code) {
298
299		case EGPC_HELLO:
300		case EGPC_HEARDU:
301			printf(" %s", egp_reach_codes[code]);
302			if (status <= EGPS_DOWN)
303				printf(" state:%s", egp_status_updown[status]);
304			else
305				printf(" [status %d]", status);
306			break;
307
308		default:
309			printf("[reach code %d]", code);
310			break;
311		}
312		break;
313
314	case EGPT_POLL:
315		printf(" poll");
316		if (egp->egp_status <= EGPS_DOWN)
317			printf(" state:%s", egp_status_updown[status]);
318		else
319			printf(" [status %d]", status);
320		printf(" net:%s", ipaddr_string(&egp->egp_sourcenet));
321		break;
322
323	case EGPT_UPDATE:
324		printf(" update");
325		if (status & EGPS_UNSOL) {
326			status &= ~EGPS_UNSOL;
327			printf(" unsolicited");
328		}
329		if (status <= EGPS_DOWN)
330			printf(" state:%s", egp_status_updown[status]);
331		else
332			printf(" [status %d]", status);
333		printf(" %s int %d ext %d",
334		       ipaddr_string(&egp->egp_sourcenet),
335		       egp->egp_intgw,
336		       egp->egp_extgw);
337		if (vflag)
338			egpnrprint(egp, length);
339		break;
340
341	case EGPT_ERROR:
342		printf(" error");
343		if (status <= EGPS_DOWN)
344			printf(" state:%s", egp_status_updown[status]);
345		else
346			printf(" [status %d]", status);
347
348		if (ntohs(egp->egp_reason) <= EGPR_UVERSION)
349			printf(" %s", egp_reasons[ntohs(egp->egp_reason)]);
350		else
351			printf(" [reason %d]", ntohs(egp->egp_reason));
352		break;
353
354	default:
355		printf("[type %d]", type);
356		break;
357	}
358}
359