print-rip.c revision 75115 
1/*
2 * Copyright (c) 1989, 1990, 1991, 1993, 1994, 1996
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
16 * written permission.
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 */
21
22#ifndef lint
23static const char rcsid[] =
24    "@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.47 2000/10/03 04:19:07 itojun Exp $ (LBL)";
25#endif
26
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#include <sys/param.h>
32#include <sys/time.h>
33#include <sys/socket.h>
34
35#include <netinet/in.h>
36
37#include <stdio.h>
38#include <ctype.h>
39#include <string.h>
40
41#include "interface.h"
42#include "addrtoname.h"
43#include "extract.h"			/* must come after interface.h */
44
45struct rip {
46	u_char rip_cmd;			/* request/response */
47	u_char rip_vers;		/* protocol version # */
48	u_short rip_zero2;		/* unused */
49};
50#define	RIPCMD_REQUEST		1	/* want info */
51#define	RIPCMD_RESPONSE		2	/* responding to request */
52#define	RIPCMD_TRACEON		3	/* turn tracing on */
53#define	RIPCMD_TRACEOFF		4	/* turn it off */
54#define	RIPCMD_POLL		5	/* want info from everybody */
55#define	RIPCMD_POLLENTRY	6	/* poll for entry */
56
57#define RIP_AUTHLEN 16
58
59struct rip_netinfo {
60	u_short rip_family;
61	u_short rip_tag;
62	u_int32_t rip_dest;
63	u_int32_t rip_dest_mask;
64	u_int32_t rip_router;
65	u_int32_t rip_metric;		/* cost of route */
66};
67
68static void
69rip_printblk(const u_char *cp, const u_char *ep)
70{
71	for (; cp < ep; cp += 2)
72		printf(" %04x", EXTRACT_16BITS(cp));
73	return;
74}
75
76static void
77rip_entry_print_v1(register int vers, register const struct rip_netinfo *ni)
78{
79	register u_short family;
80
81	/* RFC 1058 */
82	family = EXTRACT_16BITS(&ni->rip_family);
83	if (family != AF_INET) {
84		printf(" [family %d:", family);
85		rip_printblk((u_char *)&ni->rip_tag,
86			     (u_char *)&ni->rip_metric +
87			     sizeof(ni->rip_metric));
88		printf("]");
89		return;
90	}
91	if (ni->rip_tag || ni->rip_dest_mask || ni->rip_router) {
92		/* MBZ fields not zero */
93		printf(" [");
94		rip_printblk((u_char *)&ni->rip_family,
95			     (u_char *)&ni->rip_metric +
96			     sizeof(ni->rip_metric));
97		printf("]");
98		return;
99	}
100	printf(" {%s}(%d)", ipaddr_string(&ni->rip_dest),
101	       EXTRACT_32BITS(&ni->rip_metric));
102}
103
104static void
105rip_entry_print_v2(register int vers, register const struct rip_netinfo *ni)
106{
107	register u_char *p;
108	register u_short family;
109	u_char buf[RIP_AUTHLEN];
110
111	/* RFC 1723 */
112	family = EXTRACT_16BITS(&ni->rip_family);
113	if (family == 0xFFFF) {
114		if (EXTRACT_16BITS(&ni->rip_tag) == 2) {
115			memcpy(buf, &ni->rip_dest, sizeof(buf));
116			buf[sizeof(buf)-1] = '\0';
117			for (p = buf; *p; p++) {
118				if (!isprint(*p))
119					break;
120			}
121			if (!*p) {
122				printf(" [password %s]", buf);
123			} else {
124				printf(" [password: ");
125				rip_printblk((u_char *)&ni->rip_dest,
126					     (u_char *)&ni->rip_metric +
127					     sizeof(ni->rip_metric));
128				printf("]");
129			}
130		} else {
131			printf(" [auth %d:",
132			       EXTRACT_16BITS(&ni->rip_tag));
133			rip_printblk((u_char *)&ni->rip_dest,
134				     (u_char *)&ni->rip_metric +
135				     sizeof(ni->rip_metric));
136			printf("]");
137		}
138	} else if (family != AF_INET) {
139		printf(" [family %d:", family);
140		rip_printblk((u_char *)&ni->rip_tag,
141			     (u_char *)&ni->rip_metric +
142			     sizeof(ni->rip_metric));
143		printf("]");
144		return;
145	} else { /* AF_INET */
146		printf(" {%s", ipaddr_string(&ni->rip_dest));
147		if (ni->rip_dest_mask)
148			printf("/%s", ipaddr_string(&ni->rip_dest_mask));
149		if (ni->rip_router)
150			printf("->%s", ipaddr_string(&ni->rip_router));
151		if (ni->rip_tag)
152			printf(" tag %04x", EXTRACT_16BITS(&ni->rip_tag));
153		printf("}(%d)", EXTRACT_32BITS(&ni->rip_metric));
154	}
155}
156
157void
158rip_print(const u_char *dat, u_int length)
159{
160	register const struct rip *rp;
161	register const struct rip_netinfo *ni;
162	register int i, j, trunc;
163
164	i = min(length, snapend - dat) - sizeof(*rp);
165	if (i < 0) {
166		printf(" [|rip]");
167		return;
168	}
169
170	rp = (struct rip *)dat;
171	switch (rp->rip_vers) {
172	case 0:
173		/*
174		 * RFC 1058.
175		 *
176		 * XXX - RFC 1058 says
177		 *
178		 * 0  Datagrams whose version number is zero are to be ignored.
179		 *    These are from a previous version of the protocol, whose
180		 *    packet format was machine-specific.
181		 *
182		 * so perhaps we should just dump the first few words of
183		 * the packet, in hex.
184                 */
185		printf(" RIPv0: ");
186		ni = (struct rip_netinfo *)(rp + 1);
187		rip_printblk((u_char *)&ni->rip_family,
188			     (u_char *)&ni->rip_metric +
189			     sizeof(ni->rip_metric));
190		break;
191	default:
192		switch (rp->rip_cmd) {
193		case RIPCMD_REQUEST:
194			printf(" RIPv%d-req %d", rp->rip_vers, length);
195			break;
196		case RIPCMD_RESPONSE:
197			j = length / sizeof(*ni);
198			if (j * sizeof(*ni) != length - 4)
199				printf(" RIPv%d-resp [items %d] [%d]:",
200				       rp->rip_vers, j, length);
201			else
202				printf(" RIPv%d-resp [items %d]:",
203				       rp->rip_vers, j);
204			trunc = (i / sizeof(*ni)) != j;
205			ni = (struct rip_netinfo *)(rp + 1);
206			for (; (i -= sizeof(*ni)) >= 0; ++ni) {
207				if (rp->rip_vers == 1)
208					rip_entry_print_v1(rp->rip_vers, ni);
209				else
210					rip_entry_print_v2(rp->rip_vers, ni);
211			}
212			if (trunc)
213				printf("[|rip]");
214			break;
215		case RIPCMD_TRACEON:
216			printf(" RIPv%d-traceon %d: \"", rp->rip_vers, length);
217			(void)fn_print((const u_char *)(rp + 1), snapend);
218			fputs("\"\n", stdout);
219			break;
220		case RIPCMD_TRACEOFF:
221			printf(" RIPv%d-traceoff %d", rp->rip_vers, length);
222			break;
223		case RIPCMD_POLL:
224			printf(" RIPv%d-poll %d", rp->rip_vers, length);
225			break;
226		case RIPCMD_POLLENTRY:
227			printf(" RIPv%d-pollentry %d", rp->rip_vers, length);
228			break;
229		default:
230			printf(" RIPv%d-#%d %d", rp->rip_vers, rp->rip_cmd,
231			       length);
232			break;
233		}
234        }
235}
236