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dhcpcd: update README.DRAGONFLY
[dragonfly.git] / contrib / tcpdump / print-rip.c
blobfca534fb100b4c41a094f61567f78e53bce2ea36
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 /* \summary: Routing Information Protocol (RIP) printer */
23
24 /* specification: RFC 1058, RFC 2453, RFC 4822 */
25
26 #ifdef HAVE_CONFIG_H
27 #include <config.h>
28 #endif
29
30 #include "netdissect-stdinc.h"
31
32 #include "netdissect.h"
33 #include "addrtoname.h"
34 #include "extract.h"
35
36 #include "af.h"
37
38
39 /*
40 * RFC 1058 and RFC 2453 header of packet.
41 *
42 * 0 1 2 3 3
43 * 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
44 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
45 * | Command (1) | Version (1) | unused |
46 * +---------------+---------------+-------------------------------+
47 */
48 struct rip {
49 nd_uint8_t rip_cmd; /* request/response */
50 nd_uint8_t rip_vers; /* protocol version # */
51 nd_byte unused[2]; /* unused */
52 };
53
54 #define RIPCMD_REQUEST 1 /* want info */
55 #define RIPCMD_RESPONSE 2 /* responding to request */
56 #define RIPCMD_TRACEON 3 /* turn tracing on */
57 #define RIPCMD_TRACEOFF 4 /* turn it off */
58 #define RIPCMD_POLL 5 /* want info from everybody */
59 #define RIPCMD_POLLENTRY 6 /* poll for entry */
60
61 static const struct tok rip_cmd_values[] = {
62 { RIPCMD_REQUEST, "Request" },
63 { RIPCMD_RESPONSE, "Response" },
64 { RIPCMD_TRACEON, "Trace on" },
65 { RIPCMD_TRACEOFF, "Trace off" },
66 { RIPCMD_POLL, "Poll" },
67 { RIPCMD_POLLENTRY, "Poll Entry" },
68 { 0, NULL}
69 };
70
71 #define RIP_AUTHLEN 16
72 #define RIP_ROUTELEN 20
73
74 /*
75 * First 4 bytes of all RIPv1/RIPv2 entries.
76 */
77 struct rip_entry_header {
78 nd_uint16_t rip_family;
79 nd_uint16_t rip_tag;
80 };
81
82 /*
83 * RFC 1058 entry.
84 *
85 * 0 1 2 3 3
86 * 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
87 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
88 * | Address Family Identifier (2) | must be zero (2) |
89 * +-------------------------------+-------------------------------+
90 * | IP Address (4) |
91 * +---------------------------------------------------------------+
92 * | must be zero (4) |
93 * +---------------------------------------------------------------+
94 * | must be zero (4) |
95 * +---------------------------------------------------------------+
96 * | Metric (4) |
97 * +---------------------------------------------------------------+
98 */
99 struct rip_netinfo_v1 {
100 nd_uint16_t rip_family;
101 nd_byte rip_mbz1[2];
102 nd_ipv4 rip_dest;
103 nd_byte rip_mbz2[4];
104 nd_byte rip_mbz3[4];
105 nd_uint32_t rip_metric; /* cost of route */
106 };
107
108
109 /*
110 * RFC 2453 route entry
111 *
112 * 0 1 2 3 3
113 * 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
114 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
115 * | Address Family Identifier (2) | Route Tag (2) |
116 * +-------------------------------+-------------------------------+
117 * | IP Address (4) |
118 * +---------------------------------------------------------------+
119 * | Subnet Mask (4) |
120 * +---------------------------------------------------------------+
121 * | Next Hop (4) |
122 * +---------------------------------------------------------------+
123 * | Metric (4) |
124 * +---------------------------------------------------------------+
125 *
126 */
127
128 struct rip_netinfo_v2 {
129 nd_uint16_t rip_family;
130 nd_uint16_t rip_tag;
131 nd_ipv4 rip_dest;
132 nd_uint32_t rip_dest_mask;
133 nd_ipv4 rip_router;
134 nd_uint32_t rip_metric; /* cost of route */
135 };
136
137 /*
138 * RFC 2453 authentication entry
139 *
140 * 0 1 2 3 3
141 * 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
142 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
143 * | 0xFFFF | Authentication Type (2) |
144 * +-------------------------------+-------------------------------+
145 * - Authentication (16) -
146 * +---------------------------------------------------------------+
147 */
148
149 struct rip_auth_v2 {
150 nd_uint16_t rip_family;
151 nd_uint16_t rip_tag;
152 nd_byte rip_auth[16];
153 };
154
155 /*
156 * RFC 4822 Cryptographic Authentication entry.
157 *
158 * 0 1 2 3 3
159 * 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
160 * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
161 * | RIPv2 Packet Length | Key ID | Auth Data Len |
162 * +---------------+---------------+---------------+---------------+
163 * | Sequence Number (non-decreasing) |
164 * +---------------+---------------+---------------+---------------+
165 * | reserved must be zero |
166 * +---------------+---------------+---------------+---------------+
167 * | reserved must be zero |
168 * +---------------+---------------+---------------+---------------+
169 */
170 struct rip_auth_crypto_v2 {
171 nd_uint16_t rip_packet_len;
172 nd_uint8_t rip_key_id;
173 nd_uint8_t rip_auth_data_len;
174 nd_uint32_t rip_seq_num;
175 nd_byte rip_mbz1[4];
176 nd_byte rip_mbz2[4];
177 };
178
179 static unsigned
180 rip_entry_print_v1(netdissect_options *ndo, const u_char *p,
181 unsigned remaining)
182 {
183 const struct rip_entry_header *eh = (const struct rip_entry_header *)p;
184 u_short family;
185 const struct rip_netinfo_v1 *ni = (const struct rip_netinfo_v1 *)p;
186
187 /* RFC 1058 */
188 if (remaining < RIP_ROUTELEN)
189 return (0);
190 ND_TCHECK_SIZE(ni);
191 family = GET_BE_U_2(ni->rip_family);
192 if (family != BSD_AFNUM_INET && family != 0) {
193 ND_PRINT("\n\t AFI %s, ", tok2str(bsd_af_values, "Unknown (%u)", family));
194 print_unknown_data(ndo, p + sizeof(*eh), "\n\t ", RIP_ROUTELEN - sizeof(*eh));
195 return (RIP_ROUTELEN);
196 }
197 if (GET_BE_U_2(ni->rip_mbz1) ||
198 GET_BE_U_4(ni->rip_mbz2) ||
199 GET_BE_U_4(ni->rip_mbz3)) {
200 /* MBZ fields not zero */
201 print_unknown_data(ndo, p, "\n\t ", RIP_ROUTELEN);
202 return (RIP_ROUTELEN);
203 }
204 if (family == 0) {
205 ND_PRINT("\n\t AFI 0, %s, metric: %u",
206 GET_IPADDR_STRING(ni->rip_dest),
207 GET_BE_U_4(ni->rip_metric));
208 return (RIP_ROUTELEN);
209 } /* BSD_AFNUM_INET */
210 ND_PRINT("\n\t %s, metric: %u",
211 GET_IPADDR_STRING(ni->rip_dest),
212 GET_BE_U_4(ni->rip_metric));
213 return (RIP_ROUTELEN);
214 trunc:
215 return 0;
216 }
217
218 static unsigned
219 rip_entry_print_v2(netdissect_options *ndo, const u_char *p,
220 unsigned remaining)
221 {
222 const struct rip_entry_header *eh = (const struct rip_entry_header *)p;
223 u_short family;
224 const struct rip_netinfo_v2 *ni;
225
226 if (remaining < sizeof(*eh))
227 return (0);
228 ND_TCHECK_SIZE(eh);
229 family = GET_BE_U_2(eh->rip_family);
230 if (family == 0xFFFF) { /* variable-sized authentication structures */
231 uint16_t auth_type = GET_BE_U_2(eh->rip_tag);
232
233 p += sizeof(*eh);
234 remaining -= sizeof(*eh);
235 if (auth_type == 2) {
236 ND_PRINT("\n\t Simple Text Authentication data: ");
237 nd_printjnp(ndo, p, RIP_AUTHLEN);
238 } else if (auth_type == 3) {
239 const struct rip_auth_crypto_v2 *ch;
240
241 ch = (const struct rip_auth_crypto_v2 *)p;
242 ND_TCHECK_SIZE(ch);
243 if (remaining < sizeof(*ch))
244 return (0);
245 ND_PRINT("\n\t Auth header:");
246 ND_PRINT(" Packet Len %u,",
247 GET_BE_U_2(ch->rip_packet_len));
248 ND_PRINT(" Key-ID %u,", GET_U_1(ch->rip_key_id));
249 ND_PRINT(" Auth Data Len %u,",
250 GET_U_1(ch->rip_auth_data_len));
251 ND_PRINT(" SeqNo %u,", GET_BE_U_4(ch->rip_seq_num));
252 ND_PRINT(" MBZ %u,", GET_BE_U_4(ch->rip_mbz1));
253 ND_PRINT(" MBZ %u", GET_BE_U_4(ch->rip_mbz2));
254 } else if (auth_type == 1) {
255 ND_PRINT("\n\t Auth trailer:");
256 print_unknown_data(ndo, p, "\n\t ", remaining);
257 return (sizeof(*eh) + remaining); /* AT spans till the packet end */
258 } else {
259 ND_PRINT("\n\t Unknown (%u) Authentication data:",
260 auth_type);
261 print_unknown_data(ndo, p, "\n\t ", remaining);
262 return (sizeof(*eh) + remaining); /* we don't know how long this is, so we go to the packet end */
263 }
264 } else if (family != BSD_AFNUM_INET && family != 0) {
265 ND_PRINT("\n\t AFI %s", tok2str(bsd_af_values, "Unknown (%u)", family));
266 print_unknown_data(ndo, p + sizeof(*eh), "\n\t ", RIP_ROUTELEN - sizeof(*eh));
267 } else { /* BSD_AFNUM_INET or AFI 0 */
268 ni = (const struct rip_netinfo_v2 *)p;
269 ND_TCHECK_SIZE(ni);
270 if (remaining < sizeof(*ni))
271 return (0);
272 ND_PRINT("\n\t AFI %s, %15s/%-2d, tag 0x%04x, metric: %u, next-hop: ",
273 tok2str(bsd_af_values, "%u", family),
274 GET_IPADDR_STRING(ni->rip_dest),
275 mask2plen(GET_BE_U_4(ni->rip_dest_mask)),
276 GET_BE_U_2(ni->rip_tag),
277 GET_BE_U_4(ni->rip_metric));
278 if (GET_BE_U_4(ni->rip_router))
279 ND_PRINT("%s", GET_IPADDR_STRING(ni->rip_router));
280 else
281 ND_PRINT("self");
282 }
283 return (RIP_ROUTELEN);
284 trunc:
285 return 0;
286 }
287
288 void
289 rip_print(netdissect_options *ndo,
290 const u_char *dat, u_int length)
291 {
292 const struct rip *rp;
293 uint8_t vers, cmd;
294 const u_char *p;
295 u_int len, routecount;
296 unsigned entry_size;
297
298 ndo->ndo_protocol = "rip";
299 if (ndo->ndo_snapend < dat) {
300 nd_print_trunc(ndo);
301 return;
302 }
303 len = ND_BYTES_AVAILABLE_AFTER(dat);
304 if (len > length)
305 len = length;
306 if (len < sizeof(*rp)) {
307 nd_print_trunc(ndo);
308 return;
309 }
310 len -= sizeof(*rp);
311
312 rp = (const struct rip *)dat;
313
314 ND_TCHECK_SIZE(rp);
315 vers = GET_U_1(rp->rip_vers);
316 ND_PRINT("%sRIPv%u",
317 (ndo->ndo_vflag >= 1) ? "\n\t" : "",
318 vers);
319
320 if (vers == 0) {
321 /*
322 * RFC 1058.
323 *
324 * XXX - RFC 1058 says
325 *
326 * 0 Datagrams whose version number is zero are to be ignored.
327 * These are from a previous version of the protocol, whose
328 * packet format was machine-specific.
329 *
330 * so perhaps we should just dump the packet, in hex.
331 */
332 print_unknown_data(ndo, (const uint8_t *)&rp->rip_cmd, "\n\t", length);
333 return;
334 }
335
336 /* dump version and lets see if we know the commands name*/
337 cmd = GET_U_1(rp->rip_cmd);
338 ND_PRINT(", %s, length: %u",
339 tok2str(rip_cmd_values, "unknown command (%u)", cmd),
340 length);
341
342 if (ndo->ndo_vflag < 1)
343 return;
344
345 switch (cmd) {
346
347 case RIPCMD_REQUEST:
348 case RIPCMD_RESPONSE:
349 switch (vers) {
350
351 case 1:
352 routecount = length / RIP_ROUTELEN;
353 ND_PRINT(", routes: %u", routecount);
354 p = (const u_char *)(rp + 1);
355 while (len != 0) {
356 entry_size = rip_entry_print_v1(ndo, p, len);
357 if (entry_size == 0) {
358 /* Error */
359 nd_print_trunc(ndo);
360 break;
361 }
362 if (len < entry_size) {
363 ND_PRINT(" [remaining entries length %u < %u]",
364 len, entry_size);
365 nd_print_invalid(ndo);
366 break;
367 }
368 p += entry_size;
369 len -= entry_size;
370 }
371 break;
372
373 case 2:
374 routecount = length / RIP_ROUTELEN;
375 ND_PRINT(", routes: %u or less", routecount);
376 p = (const u_char *)(rp + 1);
377 while (len != 0) {
378 entry_size = rip_entry_print_v2(ndo, p, len);
379 if (entry_size == 0) {
380 /* Error */
381 nd_print_trunc(ndo);
382 break;
383 }
384 if (len < entry_size) {
385 ND_PRINT(" [remaining entries length %u < %u]",
386 len, entry_size);
387 nd_print_invalid(ndo);
388 break;
389 }
390 p += entry_size;
391 len -= entry_size;
392 }
393 break;
394
395 default:
396 ND_PRINT(", unknown version");
397 break;
398 }
399 break;
400
401 case RIPCMD_TRACEOFF:
402 case RIPCMD_POLL:
403 case RIPCMD_POLLENTRY:
404 break;
405
406 case RIPCMD_TRACEON:
407 /* fall through */
408 default:
409 if (ndo->ndo_vflag <= 1) {
410 if (!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length))
411 return;
412 }
413 break;
414 }
415 /* do we want to see an additionally hexdump ? */
416 if (ndo->ndo_vflag> 1) {
417 if (!print_unknown_data(ndo, (const uint8_t *)rp, "\n\t", length))
418 return;
419 }
420 trunc:
421 return;
422 }
DragonFly BSD