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