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[] _U_ =
24    "@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.59 2006-03-23 14:58:44 hannes Exp $ (LBL)";
25#endif
26
27#ifdef HAVE_CONFIG_H
28#include "config.h"
29#endif
30
31#include <tcpdump-stdinc.h>
32
33#include <stdio.h>
34#include <string.h>
35
36#include "interface.h"
37#include "addrtoname.h"
38#include "extract.h"			/* must come after interface.h */
39
40#include "af.h"
41
42struct rip {
43	u_int8_t rip_cmd;		/* request/response */
44	u_int8_t rip_vers;		/* protocol version # */
45	u_int8_t unused[2];		/* unused */
46};
47
48#define	RIPCMD_REQUEST		1	/* want info */
49#define	RIPCMD_RESPONSE		2	/* responding to request */
50#define	RIPCMD_TRACEON		3	/* turn tracing on */
51#define	RIPCMD_TRACEOFF		4	/* turn it off */
52#define	RIPCMD_POLL		5	/* want info from everybody */
53#define	RIPCMD_POLLENTRY	6	/* poll for entry */
54
55static const struct tok rip_cmd_values[] = {
56    { RIPCMD_REQUEST,	        "Request" },
57    { RIPCMD_RESPONSE,	        "Response" },
58    { RIPCMD_TRACEON,	        "Trace on" },
59    { RIPCMD_TRACEOFF,	        "Trace off" },
60    { RIPCMD_POLL,	        "Poll" },
61    { RIPCMD_POLLENTRY,	        "Poll Entry" },
62    { 0, NULL}
63};
64
65#define RIP_AUTHLEN  16
66#define RIP_ROUTELEN 20
67
68/*
69 * rfc 1723
70 *
71 *  0                   1                   2                   3 3
72 *  0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
73 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
74 * | Command (1)   | Version (1)   |           unused              |
75 * +---------------+---------------+-------------------------------+
76 * | Address Family Identifier (2) |        Route Tag (2)          |
77 * +-------------------------------+-------------------------------+
78 * |                         IP Address (4)                        |
79 * +---------------------------------------------------------------+
80 * |                         Subnet Mask (4)                       |
81 * +---------------------------------------------------------------+
82 * |                         Next Hop (4)                          |
83 * +---------------------------------------------------------------+
84 * |                         Metric (4)                            |
85 * +---------------------------------------------------------------+
86 *
87 */
88
89struct rip_netinfo {
90	u_int16_t rip_family;
91	u_int16_t rip_tag;
92	u_int32_t rip_dest;
93	u_int32_t rip_dest_mask;
94	u_int32_t rip_router;
95	u_int32_t rip_metric;		/* cost of route */
96};
97
98static void
99rip_entry_print_v1(register const struct rip_netinfo *ni)
100{
101	register u_short family;
102
103	/* RFC 1058 */
104	family = EXTRACT_16BITS(&ni->rip_family);
105	if (family != BSD_AFNUM_INET && family != 0) {
106		printf("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family));
107                print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
108		return;
109	}
110	if (EXTRACT_16BITS(&ni->rip_tag) ||
111	    EXTRACT_32BITS(&ni->rip_dest_mask) ||
112	    EXTRACT_32BITS(&ni->rip_router)) {
113		/* MBZ fields not zero */
114                print_unknown_data((u_int8_t *)&ni->rip_family,"\n\t  ",RIP_ROUTELEN);
115		return;
116	}
117	if (family == 0) {
118		printf("\n\t  AFI 0, %s, metric: %u",
119			ipaddr_string(&ni->rip_dest),
120			EXTRACT_32BITS(&ni->rip_metric));
121		return;
122	} /* BSD_AFNUM_INET */
123	printf("\n\t  %s, metric: %u",
124               ipaddr_string(&ni->rip_dest),
125	       EXTRACT_32BITS(&ni->rip_metric));
126}
127
128static unsigned
129rip_entry_print_v2(register const struct rip_netinfo *ni, const unsigned remaining)
130{
131	register u_short family;
132
133	family = EXTRACT_16BITS(&ni->rip_family);
134	if (family == 0xFFFF) { /* variable-sized authentication structures */
135		u_int16_t auth_type = EXTRACT_16BITS(&ni->rip_tag);
136		if (auth_type == 2) {
137			register u_char *p = (u_char *)&ni->rip_dest;
138			u_int i = 0;
139			printf("\n\t  Simple Text Authentication data: ");
140			for (; i < RIP_AUTHLEN; p++, i++)
141				putchar (isprint(*p) ? *p : '.');
142		} else if (auth_type == 3) {
143			printf("\n\t  Auth header:");
144			printf(" Packet Len %u,", EXTRACT_16BITS((u_int8_t *)ni + 4));
145			printf(" Key-ID %u,", *((u_int8_t *)ni + 6));
146			printf(" Auth Data Len %u,", *((u_int8_t *)ni + 7));
147			printf(" SeqNo %u,", EXTRACT_32BITS(&ni->rip_dest_mask));
148			printf(" MBZ %u,", EXTRACT_32BITS(&ni->rip_router));
149			printf(" MBZ %u", EXTRACT_32BITS(&ni->rip_metric));
150		} else if (auth_type == 1) {
151			printf("\n\t  Auth trailer:");
152			print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t  ",remaining);
153			return remaining; /* AT spans till the packet end */
154                } else {
155			printf("\n\t  Unknown (%u) Authentication data:",
156			       EXTRACT_16BITS(&ni->rip_tag));
157			print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t  ",remaining);
158		}
159	} else if (family != BSD_AFNUM_INET && family != 0) {
160		printf("\n\t  AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family));
161                print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t  ",RIP_ROUTELEN-2);
162	} else { /* BSD_AFNUM_INET or AFI 0 */
163		printf("\n\t  AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
164                       tok2str(bsd_af_values, "%u", family),
165                       ipaddr_string(&ni->rip_dest),
166		       mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
167                       EXTRACT_16BITS(&ni->rip_tag),
168                       EXTRACT_32BITS(&ni->rip_metric));
169		if (EXTRACT_32BITS(&ni->rip_router))
170			printf("%s", ipaddr_string(&ni->rip_router));
171                else
172                    printf("self");
173	}
174	return sizeof (*ni);
175}
176
177void
178rip_print(const u_char *dat, u_int length)
179{
180	register const struct rip *rp;
181	register const struct rip_netinfo *ni;
182	register u_int i, j;
183
184	if (snapend < dat) {
185		printf(" [|rip]");
186		return;
187	}
188	i = snapend - dat;
189	if (i > length)
190		i = length;
191	if (i < sizeof(*rp)) {
192		printf(" [|rip]");
193		return;
194	}
195	i -= sizeof(*rp);
196
197	rp = (struct rip *)dat;
198
199        printf("%sRIPv%u",
200               (vflag >= 1) ? "\n\t" : "",
201               rp->rip_vers);
202
203	switch (rp->rip_vers) {
204	case 0:
205		/*
206		 * RFC 1058.
207		 *
208		 * XXX - RFC 1058 says
209		 *
210		 * 0  Datagrams whose version number is zero are to be ignored.
211		 *    These are from a previous version of the protocol, whose
212		 *    packet format was machine-specific.
213		 *
214		 * so perhaps we should just dump the packet, in hex.
215		 */
216                print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length);
217		break;
218	default:
219                /* dump version and lets see if we know the commands name*/
220                printf(", %s, length: %u",
221                       tok2str(rip_cmd_values,
222                               "unknown command (%u)",
223                               rp->rip_cmd),
224                       length);
225
226                if (vflag < 1)
227                    return;
228
229		switch (rp->rip_cmd) {
230		case RIPCMD_REQUEST:
231		case RIPCMD_RESPONSE:
232			j = length / sizeof(*ni);
233                        printf(", routes: %u%s", j, rp->rip_vers == 2 ? " or less" : "");
234			ni = (struct rip_netinfo *)(rp + 1);
235			for (; i >= sizeof(*ni); ++ni) {
236				if (rp->rip_vers == 1)
237				{
238					rip_entry_print_v1(ni);
239					i -= sizeof(*ni);
240				}
241				else if (rp->rip_vers == 2)
242					i -= rip_entry_print_v2(ni, i);
243                                else
244                                    break;
245			}
246			if (i)
247				printf("[|rip]");
248			break;
249
250		case RIPCMD_TRACEOFF:
251		case RIPCMD_POLL:
252		case RIPCMD_POLLENTRY:
253			break;
254
255		case RIPCMD_TRACEON:
256                    /* fall through */
257	        default:
258                    if (vflag <= 1) {
259                        if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
260                            return;
261                    }
262                    break;
263                }
264                /* do we want to see an additionally hexdump ? */
265                if (vflag> 1) {
266                    if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
267                        return;
268                }
269        }
270}
271
272
273