1 /*
2 * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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 * Format and print AppleTalk packets.
22 */
23
24 #ifndef lint
25 static const char rcsid[] _U_ =
26 "@(#) $Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.81 2004-05-01 09:41:50 hannes Exp $ (LBL)";
27 #endif
28
29 #ifdef HAVE_CONFIG_H
30 #include "config.h"
31 #endif
32
33 #include <tcpdump-stdinc.h>
34
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <pcap.h>
39
40 #include "interface.h"
41 #include "addrtoname.h"
42 #include "ethertype.h"
43 #include "extract.h" /* must come after interface.h */
44 #include "appletalk.h"
45
46 static const struct tok type2str[] = {
47 { ddpRTMP, "rtmp" },
48 { ddpRTMPrequest, "rtmpReq" },
49 { ddpECHO, "echo" },
50 { ddpIP, "IP" },
51 { ddpARP, "ARP" },
52 { ddpKLAP, "KLAP" },
53 { 0, NULL }
54 };
55
56 struct aarp {
57 u_int16_t htype, ptype;
58 u_int8_t halen, palen;
59 u_int16_t op;
60 u_int8_t hsaddr[6];
61 u_int8_t psaddr[4];
62 u_int8_t hdaddr[6];
63 u_int8_t pdaddr[4];
64 };
65
66 static char tstr[] = "[|atalk]";
67
68 static void atp_print(const struct atATP *, u_int);
69 static void atp_bitmap_print(u_char);
70 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
71 static const char *print_cstring(const char *, const u_char *);
72 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
73 const u_char *,
74 u_short, u_char, u_char);
75 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
76 const u_char *);
77 static const char *ataddr_string(u_short, u_char);
78 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
79 static const char *ddpskt_string(int);
80
81 /*
82 * Print LLAP packets received on a physical LocalTalk interface.
83 */
84 u_int
ltalk_if_print(const struct pcap_pkthdr * h,const u_char * p)85 ltalk_if_print(const struct pcap_pkthdr *h, const u_char *p)
86 {
87 return (llap_print(p, h->caplen));
88 }
89
90 /*
91 * Print AppleTalk LLAP packets.
92 */
93 u_int
llap_print(register const u_char * bp,u_int length)94 llap_print(register const u_char *bp, u_int length)
95 {
96 register const struct LAP *lp;
97 register const struct atDDP *dp;
98 register const struct atShortDDP *sdp;
99 u_short snet;
100 u_int hdrlen;
101
102 if (length < sizeof(*lp)) {
103 (void)printf(" [|llap %u]", length);
104 return (length);
105 }
106 lp = (const struct LAP *)bp;
107 bp += sizeof(*lp);
108 length -= sizeof(*lp);
109 hdrlen = sizeof(*lp);
110 switch (lp->type) {
111
112 case lapShortDDP:
113 if (length < ddpSSize) {
114 (void)printf(" [|sddp %u]", length);
115 return (length);
116 }
117 sdp = (const struct atShortDDP *)bp;
118 printf("%s.%s",
119 ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
120 printf(" > %s.%s:",
121 ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
122 bp += ddpSSize;
123 length -= ddpSSize;
124 hdrlen += ddpSSize;
125 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
126 break;
127
128 case lapDDP:
129 if (length < ddpSize) {
130 (void)printf(" [|ddp %u]", length);
131 return (length);
132 }
133 dp = (const struct atDDP *)bp;
134 snet = EXTRACT_16BITS(&dp->srcNet);
135 printf("%s.%s", ataddr_string(snet, dp->srcNode),
136 ddpskt_string(dp->srcSkt));
137 printf(" > %s.%s:",
138 ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
139 ddpskt_string(dp->dstSkt));
140 bp += ddpSize;
141 length -= ddpSize;
142 hdrlen += ddpSize;
143 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
144 break;
145
146 #ifdef notdef
147 case lapKLAP:
148 klap_print(bp, length);
149 break;
150 #endif
151
152 default:
153 printf("%d > %d at-lap#%d %u",
154 lp->src, lp->dst, lp->type, length);
155 break;
156 }
157 return (hdrlen);
158 }
159
160 /*
161 * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
162 * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
163 * packets in them).
164 */
165 void
atalk_print(register const u_char * bp,u_int length)166 atalk_print(register const u_char *bp, u_int length)
167 {
168 register const struct atDDP *dp;
169 u_short snet;
170
171 if(!eflag)
172 printf("AT ");
173
174 if (length < ddpSize) {
175 (void)printf(" [|ddp %u]", length);
176 return;
177 }
178 dp = (const struct atDDP *)bp;
179 snet = EXTRACT_16BITS(&dp->srcNet);
180 printf("%s.%s", ataddr_string(snet, dp->srcNode),
181 ddpskt_string(dp->srcSkt));
182 printf(" > %s.%s: ",
183 ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
184 ddpskt_string(dp->dstSkt));
185 bp += ddpSize;
186 length -= ddpSize;
187 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
188 }
189
190 /* XXX should probably pass in the snap header and do checks like arp_print() */
191 void
aarp_print(register const u_char * bp,u_int length)192 aarp_print(register const u_char *bp, u_int length)
193 {
194 register const struct aarp *ap;
195
196 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
197
198 printf("aarp ");
199 ap = (const struct aarp *)bp;
200 if (EXTRACT_16BITS(&ap->htype) == 1 &&
201 EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
202 ap->halen == 6 && ap->palen == 4 )
203 switch (EXTRACT_16BITS(&ap->op)) {
204
205 case 1: /* request */
206 (void)printf("who-has %s tell %s",
207 AT(pdaddr), AT(psaddr));
208 return;
209
210 case 2: /* response */
211 (void)printf("reply %s is-at %s",
212 AT(psaddr), etheraddr_string(ap->hsaddr));
213 return;
214
215 case 3: /* probe (oy!) */
216 (void)printf("probe %s tell %s",
217 AT(pdaddr), AT(psaddr));
218 return;
219 }
220 (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
221 length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
222 EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen);
223 }
224
225 /*
226 * Print AppleTalk Datagram Delivery Protocol packets.
227 */
228 static void
ddp_print(register const u_char * bp,register u_int length,register int t,register u_short snet,register u_char snode,u_char skt)229 ddp_print(register const u_char *bp, register u_int length, register int t,
230 register u_short snet, register u_char snode, u_char skt)
231 {
232
233 switch (t) {
234
235 case ddpNBP:
236 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
237 break;
238
239 case ddpATP:
240 atp_print((const struct atATP *)bp, length);
241 break;
242
243 case ddpEIGRP:
244 eigrp_print(bp, length);
245 break;
246
247 default:
248 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
249 break;
250 }
251 }
252
253 static void
atp_print(register const struct atATP * ap,u_int length)254 atp_print(register const struct atATP *ap, u_int length)
255 {
256 char c;
257 u_int32_t data;
258
259 if ((const u_char *)(ap + 1) > snapend) {
260 /* Just bail if we don't have the whole chunk. */
261 fputs(tstr, stdout);
262 return;
263 }
264 if (length < sizeof(*ap)) {
265 (void)printf(" [|atp %u]", length);
266 return;
267 }
268 length -= sizeof(*ap);
269 switch (ap->control & 0xc0) {
270
271 case atpReqCode:
272 (void)printf(" atp-req%s %d",
273 ap->control & atpXO? " " : "*",
274 EXTRACT_16BITS(&ap->transID));
275
276 atp_bitmap_print(ap->bitmap);
277
278 if (length != 0)
279 (void)printf(" [len=%u]", length);
280
281 switch (ap->control & (atpEOM|atpSTS)) {
282 case atpEOM:
283 (void)printf(" [EOM]");
284 break;
285 case atpSTS:
286 (void)printf(" [STS]");
287 break;
288 case atpEOM|atpSTS:
289 (void)printf(" [EOM,STS]");
290 break;
291 }
292 break;
293
294 case atpRspCode:
295 (void)printf(" atp-resp%s%d:%d (%u)",
296 ap->control & atpEOM? "*" : " ",
297 EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
298 switch (ap->control & (atpXO|atpSTS)) {
299 case atpXO:
300 (void)printf(" [XO]");
301 break;
302 case atpSTS:
303 (void)printf(" [STS]");
304 break;
305 case atpXO|atpSTS:
306 (void)printf(" [XO,STS]");
307 break;
308 }
309 break;
310
311 case atpRelCode:
312 (void)printf(" atp-rel %d", EXTRACT_16BITS(&ap->transID));
313
314 atp_bitmap_print(ap->bitmap);
315
316 /* length should be zero */
317 if (length)
318 (void)printf(" [len=%u]", length);
319
320 /* there shouldn't be any control flags */
321 if (ap->control & (atpXO|atpEOM|atpSTS)) {
322 c = '[';
323 if (ap->control & atpXO) {
324 (void)printf("%cXO", c);
325 c = ',';
326 }
327 if (ap->control & atpEOM) {
328 (void)printf("%cEOM", c);
329 c = ',';
330 }
331 if (ap->control & atpSTS) {
332 (void)printf("%cSTS", c);
333 c = ',';
334 }
335 (void)printf("]");
336 }
337 break;
338
339 default:
340 (void)printf(" atp-0x%x %d (%u)", ap->control,
341 EXTRACT_16BITS(&ap->transID), length);
342 break;
343 }
344 data = EXTRACT_32BITS(&ap->userData);
345 if (data != 0)
346 (void)printf(" 0x%x", data);
347 }
348
349 static void
atp_bitmap_print(register u_char bm)350 atp_bitmap_print(register u_char bm)
351 {
352 register char c;
353 register int i;
354
355 /*
356 * The '& 0xff' below is needed for compilers that want to sign
357 * extend a u_char, which is the case with the Ultrix compiler.
358 * (gcc is smart enough to eliminate it, at least on the Sparc).
359 */
360 if ((bm + 1) & (bm & 0xff)) {
361 c = '<';
362 for (i = 0; bm; ++i) {
363 if (bm & 1) {
364 (void)printf("%c%d", c, i);
365 c = ',';
366 }
367 bm >>= 1;
368 }
369 (void)printf(">");
370 } else {
371 for (i = 0; bm; ++i)
372 bm >>= 1;
373 if (i > 1)
374 (void)printf("<0-%d>", i - 1);
375 else
376 (void)printf("<0>");
377 }
378 }
379
380 static void
nbp_print(register const struct atNBP * np,u_int length,register u_short snet,register u_char snode,register u_char skt)381 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
382 register u_char snode, register u_char skt)
383 {
384 register const struct atNBPtuple *tp =
385 (const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
386 int i;
387 const u_char *ep;
388
389 if (length < nbpHeaderSize) {
390 (void)printf(" truncated-nbp %u", length);
391 return;
392 }
393
394 length -= nbpHeaderSize;
395 if (length < 8) {
396 /* must be room for at least one tuple */
397 (void)printf(" truncated-nbp %u", length + nbpHeaderSize);
398 return;
399 }
400 /* ep points to end of available data */
401 ep = snapend;
402 if ((const u_char *)tp > ep) {
403 fputs(tstr, stdout);
404 return;
405 }
406 switch (i = np->control & 0xf0) {
407
408 case nbpBrRq:
409 case nbpLkUp:
410 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
411 np->id);
412 if ((const u_char *)(tp + 1) > ep) {
413 fputs(tstr, stdout);
414 return;
415 }
416 (void)nbp_name_print(tp, ep);
417 /*
418 * look for anomalies: the spec says there can only
419 * be one tuple, the address must match the source
420 * address and the enumerator should be zero.
421 */
422 if ((np->control & 0xf) != 1)
423 (void)printf(" [ntup=%d]", np->control & 0xf);
424 if (tp->enumerator)
425 (void)printf(" [enum=%d]", tp->enumerator);
426 if (EXTRACT_16BITS(&tp->net) != snet ||
427 tp->node != snode || tp->skt != skt)
428 (void)printf(" [addr=%s.%d]",
429 ataddr_string(EXTRACT_16BITS(&tp->net),
430 tp->node), tp->skt);
431 break;
432
433 case nbpLkUpReply:
434 (void)printf(" nbp-reply %d:", np->id);
435
436 /* print each of the tuples in the reply */
437 for (i = np->control & 0xf; --i >= 0 && tp; )
438 tp = nbp_tuple_print(tp, ep, snet, snode, skt);
439 break;
440
441 default:
442 (void)printf(" nbp-0x%x %d (%u)", np->control, np->id,
443 length);
444 break;
445 }
446 }
447
448 /* print a counted string */
449 static const char *
print_cstring(register const char * cp,register const u_char * ep)450 print_cstring(register const char *cp, register const u_char *ep)
451 {
452 register u_int length;
453
454 if (cp >= (const char *)ep) {
455 fputs(tstr, stdout);
456 return (0);
457 }
458 length = *cp++;
459
460 /* Spec says string can be at most 32 bytes long */
461 if (length > 32) {
462 (void)printf("[len=%u]", length);
463 return (0);
464 }
465 while ((int)--length >= 0) {
466 if (cp >= (const char *)ep) {
467 fputs(tstr, stdout);
468 return (0);
469 }
470 putchar(*cp++);
471 }
472 return (cp);
473 }
474
475 static const struct atNBPtuple *
nbp_tuple_print(register const struct atNBPtuple * tp,register const u_char * ep,register u_short snet,register u_char snode,register u_char skt)476 nbp_tuple_print(register const struct atNBPtuple *tp,
477 register const u_char *ep,
478 register u_short snet, register u_char snode,
479 register u_char skt)
480 {
481 register const struct atNBPtuple *tpn;
482
483 if ((const u_char *)(tp + 1) > ep) {
484 fputs(tstr, stdout);
485 return 0;
486 }
487 tpn = nbp_name_print(tp, ep);
488
489 /* if the enumerator isn't 1, print it */
490 if (tp->enumerator != 1)
491 (void)printf("(%d)", tp->enumerator);
492
493 /* if the socket doesn't match the src socket, print it */
494 if (tp->skt != skt)
495 (void)printf(" %d", tp->skt);
496
497 /* if the address doesn't match the src address, it's an anomaly */
498 if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
499 (void)printf(" [addr=%s]",
500 ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
501
502 return (tpn);
503 }
504
505 static const struct atNBPtuple *
nbp_name_print(const struct atNBPtuple * tp,register const u_char * ep)506 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
507 {
508 register const char *cp = (const char *)tp + nbpTupleSize;
509
510 putchar(' ');
511
512 /* Object */
513 putchar('"');
514 if ((cp = print_cstring(cp, ep)) != NULL) {
515 /* Type */
516 putchar(':');
517 if ((cp = print_cstring(cp, ep)) != NULL) {
518 /* Zone */
519 putchar('@');
520 if ((cp = print_cstring(cp, ep)) != NULL)
521 putchar('"');
522 }
523 }
524 return ((const struct atNBPtuple *)cp);
525 }
526
527
528 #define HASHNAMESIZE 4096
529
530 struct hnamemem {
531 int addr;
532 char *name;
533 struct hnamemem *nxt;
534 };
535
536 static struct hnamemem hnametable[HASHNAMESIZE];
537
538 static const char *
ataddr_string(u_short atnet,u_char athost)539 ataddr_string(u_short atnet, u_char athost)
540 {
541 register struct hnamemem *tp, *tp2;
542 register int i = (atnet << 8) | athost;
543 char nambuf[256+1];
544 static int first = 1;
545 FILE *fp;
546
547 /*
548 * if this is the first call, see if there's an AppleTalk
549 * number to name map file.
550 */
551 if (first && (first = 0, !nflag)
552 && (fp = fopen("/etc/atalk.names", "r"))) {
553 char line[256];
554 int i1, i2;
555
556 while (fgets(line, sizeof(line), fp)) {
557 if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
558 continue;
559 if (sscanf(line, "%d.%d %256s", &i1, &i2, nambuf) == 3)
560 /* got a hostname. */
561 i2 |= (i1 << 8);
562 else if (sscanf(line, "%d %256s", &i1, nambuf) == 2)
563 /* got a net name */
564 i2 = (i1 << 8) | 255;
565 else
566 continue;
567
568 for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
569 tp->nxt; tp = tp->nxt)
570 ;
571 tp->addr = i2;
572 tp->nxt = newhnamemem();
573 tp->name = strdup(nambuf);
574 }
575 fclose(fp);
576 }
577
578 for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
579 if (tp->addr == i)
580 return (tp->name);
581
582 /* didn't have the node name -- see if we've got the net name */
583 i |= 255;
584 for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
585 if (tp2->addr == i) {
586 tp->addr = (atnet << 8) | athost;
587 tp->nxt = newhnamemem();
588 (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
589 tp2->name, athost);
590 tp->name = strdup(nambuf);
591 return (tp->name);
592 }
593
594 tp->addr = (atnet << 8) | athost;
595 tp->nxt = newhnamemem();
596 if (athost != 255)
597 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet, athost);
598 else
599 (void)snprintf(nambuf, sizeof(nambuf), "%d", atnet);
600 tp->name = strdup(nambuf);
601
602 return (tp->name);
603 }
604
605 static const struct tok skt2str[] = {
606 { rtmpSkt, "rtmp" }, /* routing table maintenance */
607 { nbpSkt, "nis" }, /* name info socket */
608 { echoSkt, "echo" }, /* AppleTalk echo protocol */
609 { zipSkt, "zip" }, /* zone info protocol */
610 { 0, NULL }
611 };
612
613 static const char *
ddpskt_string(register int skt)614 ddpskt_string(register int skt)
615 {
616 static char buf[8];
617
618 if (nflag) {
619 (void)snprintf(buf, sizeof(buf), "%d", skt);
620 return (buf);
621 }
622 return (tok2str(skt2str, "%d", skt));
623 }
624