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[dragonfly.git] / contrib / tcpdump-3.8.3 / print-icmp.c
blob3cfbe6b62d1df22c1766b118dc46ee0f258cb6d2
1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1993, 1994, 1995, 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
23 static const char rcsid[] _U_ =
24 "@(#) $Header: /tcpdump/master/tcpdump/print-icmp.c,v 1.73.2.3 2004/03/24 00:56:34 guy 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 "ip.h"
41 #include "udp.h"
42 #include "ipproto.h"
43
44 /*
45 * Interface Control Message Protocol Definitions.
46 * Per RFC 792, September 1981.
47 */
48
49 /*
50 * Structure of an icmp header.
51 */
52 struct icmp {
53 u_int8_t icmp_type; /* type of message, see below */
54 u_int8_t icmp_code; /* type sub code */
55 u_int16_t icmp_cksum; /* ones complement cksum of struct */
56 union {
57 u_int8_t ih_pptr; /* ICMP_PARAMPROB */
58 struct in_addr ih_gwaddr; /* ICMP_REDIRECT */
59 struct ih_idseq {
60 u_int16_t icd_id;
61 u_int16_t icd_seq;
62 } ih_idseq;
63 u_int32_t ih_void;
64
65 /* ICMP_UNREACH_NEEDFRAG -- Path MTU Discovery (RFC1191) */
66 struct ih_pmtu {
67 u_int16_t ipm_void;
68 u_int16_t ipm_nextmtu;
69 } ih_pmtu;
70 } icmp_hun;
71 #define icmp_pptr icmp_hun.ih_pptr
72 #define icmp_gwaddr icmp_hun.ih_gwaddr
73 #define icmp_id icmp_hun.ih_idseq.icd_id
74 #define icmp_seq icmp_hun.ih_idseq.icd_seq
75 #define icmp_void icmp_hun.ih_void
76 #define icmp_pmvoid icmp_hun.ih_pmtu.ipm_void
77 #define icmp_nextmtu icmp_hun.ih_pmtu.ipm_nextmtu
78 union {
79 struct id_ts {
80 u_int32_t its_otime;
81 u_int32_t its_rtime;
82 u_int32_t its_ttime;
83 } id_ts;
84 struct id_ip {
85 struct ip idi_ip;
86 /* options and then 64 bits of data */
87 } id_ip;
88 u_int32_t id_mask;
89 u_int8_t id_data[1];
90 } icmp_dun;
91 #define icmp_otime icmp_dun.id_ts.its_otime
92 #define icmp_rtime icmp_dun.id_ts.its_rtime
93 #define icmp_ttime icmp_dun.id_ts.its_ttime
94 #define icmp_ip icmp_dun.id_ip.idi_ip
95 #define icmp_mask icmp_dun.id_mask
96 #define icmp_data icmp_dun.id_data
97 };
98
99 /*
100 * Lower bounds on packet lengths for various types.
101 * For the error advice packets must first insure that the
102 * packet is large enought to contain the returned ip header.
103 * Only then can we do the check to see if 64 bits of packet
104 * data have been returned, since we need to check the returned
105 * ip header length.
106 */
107 #define ICMP_MINLEN 8 /* abs minimum */
108 #define ICMP_TSLEN (8 + 3 * sizeof (u_int32_t)) /* timestamp */
109 #define ICMP_MASKLEN 12 /* address mask */
110 #define ICMP_ADVLENMIN (8 + sizeof (struct ip) + 8) /* min */
111 #define ICMP_ADVLEN(p) (8 + (IP_HL(&(p)->icmp_ip) << 2) + 8)
112 /* N.B.: must separately check that ip_hl >= 5 */
113
114 /*
115 * Definition of type and code field values.
116 */
117 #define ICMP_ECHOREPLY 0 /* echo reply */
118 #define ICMP_UNREACH 3 /* dest unreachable, codes: */
119 #define ICMP_UNREACH_NET 0 /* bad net */
120 #define ICMP_UNREACH_HOST 1 /* bad host */
121 #define ICMP_UNREACH_PROTOCOL 2 /* bad protocol */
122 #define ICMP_UNREACH_PORT 3 /* bad port */
123 #define ICMP_UNREACH_NEEDFRAG 4 /* IP_DF caused drop */
124 #define ICMP_UNREACH_SRCFAIL 5 /* src route failed */
125 #define ICMP_UNREACH_NET_UNKNOWN 6 /* unknown net */
126 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* unknown host */
127 #define ICMP_UNREACH_ISOLATED 8 /* src host isolated */
128 #define ICMP_UNREACH_NET_PROHIB 9 /* prohibited access */
129 #define ICMP_UNREACH_HOST_PROHIB 10 /* ditto */
130 #define ICMP_UNREACH_TOSNET 11 /* bad tos for net */
131 #define ICMP_UNREACH_TOSHOST 12 /* bad tos for host */
132 #define ICMP_SOURCEQUENCH 4 /* packet lost, slow down */
133 #define ICMP_REDIRECT 5 /* shorter route, codes: */
134 #define ICMP_REDIRECT_NET 0 /* for network */
135 #define ICMP_REDIRECT_HOST 1 /* for host */
136 #define ICMP_REDIRECT_TOSNET 2 /* for tos and net */
137 #define ICMP_REDIRECT_TOSHOST 3 /* for tos and host */
138 #define ICMP_ECHO 8 /* echo service */
139 #define ICMP_ROUTERADVERT 9 /* router advertisement */
140 #define ICMP_ROUTERSOLICIT 10 /* router solicitation */
141 #define ICMP_TIMXCEED 11 /* time exceeded, code: */
142 #define ICMP_TIMXCEED_INTRANS 0 /* ttl==0 in transit */
143 #define ICMP_TIMXCEED_REASS 1 /* ttl==0 in reass */
144 #define ICMP_PARAMPROB 12 /* ip header bad */
145 #define ICMP_PARAMPROB_OPTABSENT 1 /* req. opt. absent */
146 #define ICMP_TSTAMP 13 /* timestamp request */
147 #define ICMP_TSTAMPREPLY 14 /* timestamp reply */
148 #define ICMP_IREQ 15 /* information request */
149 #define ICMP_IREQREPLY 16 /* information reply */
150 #define ICMP_MASKREQ 17 /* address mask request */
151 #define ICMP_MASKREPLY 18 /* address mask reply */
152
153 #define ICMP_MAXTYPE 18
154
155 #define ICMP_INFOTYPE(type) \
156 ((type) == ICMP_ECHOREPLY || (type) == ICMP_ECHO || \
157 (type) == ICMP_ROUTERADVERT || (type) == ICMP_ROUTERSOLICIT || \
158 (type) == ICMP_TSTAMP || (type) == ICMP_TSTAMPREPLY || \
159 (type) == ICMP_IREQ || (type) == ICMP_IREQREPLY || \
160 (type) == ICMP_MASKREQ || (type) == ICMP_MASKREPLY)
161 /* rfc1700 */
162 #ifndef ICMP_UNREACH_NET_UNKNOWN
163 #define ICMP_UNREACH_NET_UNKNOWN 6 /* destination net unknown */
164 #endif
165 #ifndef ICMP_UNREACH_HOST_UNKNOWN
166 #define ICMP_UNREACH_HOST_UNKNOWN 7 /* destination host unknown */
167 #endif
168 #ifndef ICMP_UNREACH_ISOLATED
169 #define ICMP_UNREACH_ISOLATED 8 /* source host isolated */
170 #endif
171 #ifndef ICMP_UNREACH_NET_PROHIB
172 #define ICMP_UNREACH_NET_PROHIB 9 /* admin prohibited net */
173 #endif
174 #ifndef ICMP_UNREACH_HOST_PROHIB
175 #define ICMP_UNREACH_HOST_PROHIB 10 /* admin prohibited host */
176 #endif
177 #ifndef ICMP_UNREACH_TOSNET
178 #define ICMP_UNREACH_TOSNET 11 /* tos prohibited net */
179 #endif
180 #ifndef ICMP_UNREACH_TOSHOST
181 #define ICMP_UNREACH_TOSHOST 12 /* tos prohibited host */
182 #endif
183
184 /* rfc1716 */
185 #ifndef ICMP_UNREACH_FILTER_PROHIB
186 #define ICMP_UNREACH_FILTER_PROHIB 13 /* admin prohibited filter */
187 #endif
188 #ifndef ICMP_UNREACH_HOST_PRECEDENCE
189 #define ICMP_UNREACH_HOST_PRECEDENCE 14 /* host precedence violation */
190 #endif
191 #ifndef ICMP_UNREACH_PRECEDENCE_CUTOFF
192 #define ICMP_UNREACH_PRECEDENCE_CUTOFF 15 /* precedence cutoff */
193 #endif
194
195 /* Most of the icmp types */
196 static struct tok icmp2str[] = {
197 { ICMP_ECHOREPLY, "echo reply" },
198 { ICMP_SOURCEQUENCH, "source quench" },
199 { ICMP_ECHO, "echo request" },
200 { ICMP_ROUTERSOLICIT, "router solicitation" },
201 { ICMP_TSTAMP, "time stamp request" },
202 { ICMP_TSTAMPREPLY, "time stamp reply" },
203 { ICMP_IREQ, "information request" },
204 { ICMP_IREQREPLY, "information reply" },
205 { ICMP_MASKREQ, "address mask request" },
206 { 0, NULL }
207 };
208
209 /* Formats for most of the ICMP_UNREACH codes */
210 static struct tok unreach2str[] = {
211 { ICMP_UNREACH_NET, "net %s unreachable" },
212 { ICMP_UNREACH_HOST, "host %s unreachable" },
213 { ICMP_UNREACH_SRCFAIL,
214 "%s unreachable - source route failed" },
215 { ICMP_UNREACH_NET_UNKNOWN, "net %s unreachable - unknown" },
216 { ICMP_UNREACH_HOST_UNKNOWN, "host %s unreachable - unknown" },
217 { ICMP_UNREACH_ISOLATED,
218 "%s unreachable - source host isolated" },
219 { ICMP_UNREACH_NET_PROHIB,
220 "net %s unreachable - admin prohibited" },
221 { ICMP_UNREACH_HOST_PROHIB,
222 "host %s unreachable - admin prohibited" },
223 { ICMP_UNREACH_TOSNET,
224 "net %s unreachable - tos prohibited" },
225 { ICMP_UNREACH_TOSHOST,
226 "host %s unreachable - tos prohibited" },
227 { ICMP_UNREACH_FILTER_PROHIB,
228 "host %s unreachable - admin prohibited filter" },
229 { ICMP_UNREACH_HOST_PRECEDENCE,
230 "host %s unreachable - host precedence violation" },
231 { ICMP_UNREACH_PRECEDENCE_CUTOFF,
232 "host %s unreachable - precedence cutoff" },
233 { 0, NULL }
234 };
235
236 /* Formats for the ICMP_REDIRECT codes */
237 static struct tok type2str[] = {
238 { ICMP_REDIRECT_NET, "redirect %s to net %s" },
239 { ICMP_REDIRECT_HOST, "redirect %s to host %s" },
240 { ICMP_REDIRECT_TOSNET, "redirect-tos %s to net %s" },
241 { ICMP_REDIRECT_TOSHOST, "redirect-tos %s to host %s" },
242 { 0, NULL }
243 };
244
245 /* rfc1191 */
246 struct mtu_discovery {
247 u_int16_t unused;
248 u_int16_t nexthopmtu;
249 };
250
251 /* rfc1256 */
252 struct ih_rdiscovery {
253 u_int8_t ird_addrnum;
254 u_int8_t ird_addrsiz;
255 u_int16_t ird_lifetime;
256 };
257
258 struct id_rdiscovery {
259 u_int32_t ird_addr;
260 u_int32_t ird_pref;
261 };
262
263 void
264 icmp_print(const u_char *bp, u_int plen, const u_char *bp2, int fragmented)
265 {
266 char *cp;
267 const struct icmp *dp;
268 const struct ip *ip;
269 const char *str, *fmt;
270 const struct ip *oip;
271 const struct udphdr *ouh;
272 u_int hlen, dport, mtu;
273 char buf[MAXHOSTNAMELEN + 100];
274
275 dp = (struct icmp *)bp;
276 ip = (struct ip *)bp2;
277 str = buf;
278
279 TCHECK(dp->icmp_code);
280 switch (dp->icmp_type) {
281
282 case ICMP_ECHO:
283 case ICMP_ECHOREPLY:
284 TCHECK(dp->icmp_seq);
285 (void)snprintf(buf, sizeof(buf), "echo %s seq %u",
286 dp->icmp_type == ICMP_ECHO ?
287 "request" : "reply",
288 EXTRACT_16BITS(&dp->icmp_seq));
289 break;
290
291 case ICMP_UNREACH:
292 TCHECK(dp->icmp_ip.ip_dst);
293 switch (dp->icmp_code) {
294
295 case ICMP_UNREACH_PROTOCOL:
296 TCHECK(dp->icmp_ip.ip_p);
297 (void)snprintf(buf, sizeof(buf),
298 "%s protocol %d unreachable",
299 ipaddr_string(&dp->icmp_ip.ip_dst),
300 dp->icmp_ip.ip_p);
301 break;
302
303 case ICMP_UNREACH_PORT:
304 TCHECK(dp->icmp_ip.ip_p);
305 oip = &dp->icmp_ip;
306 hlen = IP_HL(oip) * 4;
307 ouh = (struct udphdr *)(((u_char *)oip) + hlen);
308 TCHECK(ouh->uh_dport);
309 dport = EXTRACT_16BITS(&ouh->uh_dport);
310 switch (oip->ip_p) {
311
312 case IPPROTO_TCP:
313 (void)snprintf(buf, sizeof(buf),
314 "%s tcp port %s unreachable",
315 ipaddr_string(&oip->ip_dst),
316 tcpport_string(dport));
317 break;
318
319 case IPPROTO_UDP:
320 (void)snprintf(buf, sizeof(buf),
321 "%s udp port %s unreachable",
322 ipaddr_string(&oip->ip_dst),
323 udpport_string(dport));
324 break;
325
326 default:
327 (void)snprintf(buf, sizeof(buf),
328 "%s protocol %d port %d unreachable",
329 ipaddr_string(&oip->ip_dst),
330 oip->ip_p, dport);
331 break;
332 }
333 break;
334
335 case ICMP_UNREACH_NEEDFRAG:
336 {
337 register const struct mtu_discovery *mp;
338 mp = (struct mtu_discovery *)&dp->icmp_void;
339 mtu = EXTRACT_16BITS(&mp->nexthopmtu);
340 if (mtu) {
341 (void)snprintf(buf, sizeof(buf),
342 "%s unreachable - need to frag (mtu %d)",
343 ipaddr_string(&dp->icmp_ip.ip_dst), mtu);
344 } else {
345 (void)snprintf(buf, sizeof(buf),
346 "%s unreachable - need to frag",
347 ipaddr_string(&dp->icmp_ip.ip_dst));
348 }
349 }
350 break;
351
352 default:
353 fmt = tok2str(unreach2str, "#%d %%s unreachable",
354 dp->icmp_code);
355 (void)snprintf(buf, sizeof(buf), fmt,
356 ipaddr_string(&dp->icmp_ip.ip_dst));
357 break;
358 }
359 break;
360
361 case ICMP_REDIRECT:
362 TCHECK(dp->icmp_ip.ip_dst);
363 fmt = tok2str(type2str, "redirect-#%d %%s to net %%s",
364 dp->icmp_code);
365 (void)snprintf(buf, sizeof(buf), fmt,
366 ipaddr_string(&dp->icmp_ip.ip_dst),
367 ipaddr_string(&dp->icmp_gwaddr));
368 break;
369
370 case ICMP_ROUTERADVERT:
371 {
372 register const struct ih_rdiscovery *ihp;
373 register const struct id_rdiscovery *idp;
374 u_int lifetime, num, size;
375
376 (void)snprintf(buf, sizeof(buf), "router advertisement");
377 cp = buf + strlen(buf);
378
379 ihp = (struct ih_rdiscovery *)&dp->icmp_void;
380 TCHECK(*ihp);
381 (void)strncpy(cp, " lifetime ", sizeof(buf) - (cp - buf));
382 cp = buf + strlen(buf);
383 lifetime = EXTRACT_16BITS(&ihp->ird_lifetime);
384 if (lifetime < 60) {
385 (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u",
386 lifetime);
387 } else if (lifetime < 60 * 60) {
388 (void)snprintf(cp, sizeof(buf) - (cp - buf), "%u:%02u",
389 lifetime / 60, lifetime % 60);
390 } else {
391 (void)snprintf(cp, sizeof(buf) - (cp - buf),
392 "%u:%02u:%02u",
393 lifetime / 3600,
394 (lifetime % 3600) / 60,
395 lifetime % 60);
396 }
397 cp = buf + strlen(buf);
398
399 num = ihp->ird_addrnum;
400 (void)snprintf(cp, sizeof(buf) - (cp - buf), " %d:", num);
401 cp = buf + strlen(buf);
402
403 size = ihp->ird_addrsiz;
404 if (size != 2) {
405 (void)snprintf(cp, sizeof(buf) - (cp - buf),
406 " [size %d]", size);
407 break;
408 }
409 idp = (struct id_rdiscovery *)&dp->icmp_data;
410 while (num-- > 0) {
411 TCHECK(*idp);
412 (void)snprintf(cp, sizeof(buf) - (cp - buf), " {%s %u}",
413 ipaddr_string(&idp->ird_addr),
414 EXTRACT_32BITS(&idp->ird_pref));
415 cp = buf + strlen(buf);
416 ++idp;
417 }
418 }
419 break;
420
421 case ICMP_TIMXCEED:
422 TCHECK(dp->icmp_ip.ip_dst);
423 switch (dp->icmp_code) {
424
425 case ICMP_TIMXCEED_INTRANS:
426 str = "time exceeded in-transit";
427 break;
428
429 case ICMP_TIMXCEED_REASS:
430 str = "ip reassembly time exceeded";
431 break;
432
433 default:
434 (void)snprintf(buf, sizeof(buf), "time exceeded-#%d",
435 dp->icmp_code);
436 break;
437 }
438 break;
439
440 case ICMP_PARAMPROB:
441 if (dp->icmp_code)
442 (void)snprintf(buf, sizeof(buf),
443 "parameter problem - code %d", dp->icmp_code);
444 else {
445 TCHECK(dp->icmp_pptr);
446 (void)snprintf(buf, sizeof(buf),
447 "parameter problem - octet %d", dp->icmp_pptr);
448 }
449 break;
450
451 case ICMP_MASKREPLY:
452 TCHECK(dp->icmp_mask);
453 (void)snprintf(buf, sizeof(buf), "address mask is 0x%08x",
454 EXTRACT_32BITS(&dp->icmp_mask));
455 break;
456
457 case ICMP_TSTAMP:
458 TCHECK(dp->icmp_seq);
459 (void)snprintf(buf, sizeof(buf),
460 "time stamp query id %u seq %u",
461 EXTRACT_16BITS(&dp->icmp_id),
462 EXTRACT_16BITS(&dp->icmp_seq));
463 break;
464
465 case ICMP_TSTAMPREPLY:
466 TCHECK(dp->icmp_ttime);
467 (void)snprintf(buf, sizeof(buf),
468 "time stamp reply id %u seq %u : org 0x%x recv 0x%x xmit 0x%x",
469 EXTRACT_16BITS(&dp->icmp_id),
470 EXTRACT_16BITS(&dp->icmp_seq),
471 EXTRACT_32BITS(&dp->icmp_otime),
472 EXTRACT_32BITS(&dp->icmp_rtime),
473 EXTRACT_32BITS(&dp->icmp_ttime));
474 break;
475
476 default:
477 str = tok2str(icmp2str, "type-#%d", dp->icmp_type);
478 break;
479 }
480 (void)printf("icmp %d: %s", plen, str);
481 if (vflag && !fragmented) { /* don't attempt checksumming if this is a frag */
482 u_int16_t sum, icmp_sum;
483 if (TTEST2(*bp, plen)) {
484 sum = in_cksum((u_short*)dp, plen, 0);
485 if (sum != 0) {
486 icmp_sum = EXTRACT_16BITS(&dp->icmp_cksum);
487 (void)printf(" (wrong icmp cksum %x (->%x)!)",
488 icmp_sum,
489 in_cksum_shouldbe(icmp_sum, sum));
490 }
491 }
492 }
493 if (vflag > 1 && !ICMP_INFOTYPE(dp->icmp_type)) {
494 bp += 8;
495 (void)printf(" for ");
496 ip = (struct ip *)bp;
497 snaplen = snapend - bp;
498 ip_print(bp, EXTRACT_16BITS(&ip->ip_len));
499 }
500 return;
501 trunc:
502 fputs("[|icmp]", stdout);
503 }
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