print-rip.c revision 1.1 
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) {
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	} /* BSD_AFNUM_INET */
117	printf("\n\t  %s, metric: %u",
118               ipaddr_string(&ni->rip_dest),
119	       EXTRACT_32BITS(&ni->rip_metric));
120}
121
122static void
123rip_entry_print_v2(register const struct rip_netinfo *ni)
124{
125	register u_char *p;
126	register u_short family;
127	u_char buf[RIP_AUTHLEN];
128
129	family = EXTRACT_16BITS(&ni->rip_family);
130	if (family == 0xFFFF) { /* 16 bytes authentication ? */
131                if (EXTRACT_16BITS(&ni->rip_tag) == 2) { /* simple text authentication ? */
132			memcpy(buf, &ni->rip_dest, sizeof(buf));
133			buf[sizeof(buf)-1] = '\0';
134			for (p = buf; *p; p++) {
135				if (!isprint(*p))
136					break;
137			}
138                        printf("\n\t  Simple Text Authentication data: %s", buf);
139                } else {
140			printf("\n\t  Unknown (%u) Authentication data:",
141			       EXTRACT_16BITS(&ni->rip_tag));
142                        print_unknown_data((u_int8_t *)&ni->rip_dest,"\n\t  ",RIP_AUTHLEN);
143		}
144	} else if (family != BSD_AFNUM_INET) {
145		printf("\n\t  AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family));
146                print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t  ",RIP_ROUTELEN-2);
147		return;
148	} else { /* BSD_AFNUM_INET */
149		printf("\n\t  AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
150                       tok2str(bsd_af_values, "Unknown (%u)", family),
151                       ipaddr_string(&ni->rip_dest),
152		       mask2plen(EXTRACT_32BITS(&ni->rip_dest_mask)),
153                       EXTRACT_16BITS(&ni->rip_tag),
154                       EXTRACT_32BITS(&ni->rip_metric));
155		if (EXTRACT_32BITS(&ni->rip_router))
156			printf("%s", ipaddr_string(&ni->rip_router));
157                else
158                    printf("self");
159	}
160}
161
162void
163rip_print(const u_char *dat, u_int length)
164{
165	register const struct rip *rp;
166	register const struct rip_netinfo *ni;
167	register u_int i, j;
168	register int trunc;
169
170	if (snapend < dat) {
171		printf(" [|rip]");
172		return;
173	}
174	i = snapend - dat;
175	if (i > length)
176		i = length;
177	if (i < sizeof(*rp)) {
178		printf(" [|rip]");
179		return;
180	}
181	i -= sizeof(*rp);
182
183	rp = (struct rip *)dat;
184
185        printf("%sRIPv%u",
186               (vflag >= 1) ? "\n\t" : "",
187               rp->rip_vers);
188
189	switch (rp->rip_vers) {
190	case 0:
191		/*
192		 * RFC 1058.
193		 *
194		 * XXX - RFC 1058 says
195		 *
196		 * 0  Datagrams whose version number is zero are to be ignored.
197		 *    These are from a previous version of the protocol, whose
198		 *    packet format was machine-specific.
199		 *
200		 * so perhaps we should just dump the packet, in hex.
201		 */
202                print_unknown_data((u_int8_t *)&rp->rip_cmd,"\n\t",length);
203		break;
204	default:
205                /* dump version and lets see if we know the commands name*/
206                printf(", %s, length: %u",
207                       tok2str(rip_cmd_values,
208                               "unknown command (%u)",
209                               rp->rip_cmd),
210                       length);
211
212                if (vflag < 1)
213                    return;
214
215		switch (rp->rip_cmd) {
216		case RIPCMD_RESPONSE:
217			j = length / sizeof(*ni);
218                        printf(", routes: %u",j);
219			trunc = (i / sizeof(*ni)) != j;
220			ni = (struct rip_netinfo *)(rp + 1);
221			for (; i >= sizeof(*ni); ++ni) {
222				if (rp->rip_vers == 1)
223					rip_entry_print_v1(ni);
224				else if (rp->rip_vers == 2)
225					rip_entry_print_v2(ni);
226                                else
227                                    break;
228				i -= sizeof(*ni);
229			}
230			if (trunc)
231				printf("[|rip]");
232			break;
233
234		case RIPCMD_REQUEST:
235		case RIPCMD_TRACEOFF:
236		case RIPCMD_POLL:
237		case RIPCMD_POLLENTRY:
238			break;
239
240		case RIPCMD_TRACEON:
241                    /* fall through */
242	        default:
243                    if (vflag <= 1) {
244                        if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
245                            return;
246                    }
247                    break;
248                }
249                /* do we want to see an additionally hexdump ? */
250                if (vflag> 1) {
251                    if(!print_unknown_data((u_int8_t *)rp,"\n\t",length))
252                        return;
253                }
254        }
255}
256
257
258