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[dragonfly.git] / contrib / tcpdump / print-rip.c
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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_ =
ea7b4bf5 24 "@(#) $Header: /tcpdump/master/tcpdump/print-rip.c,v 1.59 2006-03-23 14:58:44 hannes Exp $ (LBL)";
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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
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40#include "af.h"
41
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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);
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105 if (family != BSD_AFNUM_INET) {
106 printf("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family));
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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;
ea7b4bf5 116 } /* BSD_AFNUM_INET */
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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 }
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144 } else if (family != BSD_AFNUM_INET) {
145 printf("\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family));
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146 print_unknown_data((u_int8_t *)&ni->rip_tag,"\n\t ",RIP_ROUTELEN-2);
147 return;
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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),
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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