xref: /dragonfly/contrib/tcpdump/print-atalk.c (revision e5a92d33) 
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 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
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
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
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
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
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
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
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
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 *
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 *
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 *
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 	u_int32_t addr;
532 	const char *name;
533 	struct hnamemem *nxt;
534 };
535 
536 static struct hnamemem hnametable[HASHNAMESIZE];
537 
538 static const char *
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[MAXHOSTNAMELEN + 20];
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 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 *
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