xref: /freebsd/contrib/tcpdump/print-atalk.c (revision 4f29da19bd44f0e99f021510460a81bf754c21d2) 
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  * $FreeBSD$
24  */
25 
26 #ifndef lint
27 static const char rcsid[] _U_ =
28     "@(#) $Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.81 2004/05/01 09:41:50 hannes Exp $ (LBL)";
29 #endif
30 
31 #ifdef HAVE_CONFIG_H
32 #include "config.h"
33 #endif
34 
35 #include <tcpdump-stdinc.h>
36 
37 #include <stdio.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include <pcap.h>
41 
42 #include "interface.h"
43 #include "addrtoname.h"
44 #include "ethertype.h"
45 #include "extract.h"			/* must come after interface.h */
46 #include "appletalk.h"
47 
48 static struct tok type2str[] = {
49 	{ ddpRTMP,		"rtmp" },
50 	{ ddpRTMPrequest,	"rtmpReq" },
51 	{ ddpECHO,		"echo" },
52 	{ ddpIP,		"IP" },
53 	{ ddpARP,		"ARP" },
54 	{ ddpKLAP,		"KLAP" },
55 	{ 0,			NULL }
56 };
57 
58 struct aarp {
59 	u_int16_t	htype, ptype;
60 	u_int8_t	halen, palen;
61 	u_int16_t	op;
62 	u_int8_t	hsaddr[6];
63 	u_int8_t	psaddr[4];
64 	u_int8_t	hdaddr[6];
65 	u_int8_t	pdaddr[4];
66 };
67 
68 static char tstr[] = "[|atalk]";
69 
70 static void atp_print(const struct atATP *, u_int);
71 static void atp_bitmap_print(u_char);
72 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
73 static const char *print_cstring(const char *, const u_char *);
74 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
75 						const u_char *,
76 						u_short, u_char, u_char);
77 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
78 					       const u_char *);
79 static const char *ataddr_string(u_short, u_char);
80 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
81 static const char *ddpskt_string(int);
82 
83 /*
84  * Print LLAP packets received on a physical LocalTalk interface.
85  */
86 u_int
87 ltalk_if_print(const struct pcap_pkthdr *h, const u_char *p)
88 {
89 	return (llap_print(p, h->caplen));
90 }
91 
92 /*
93  * Print AppleTalk LLAP packets.
94  */
95 u_int
96 llap_print(register const u_char *bp, u_int length)
97 {
98 	register const struct LAP *lp;
99 	register const struct atDDP *dp;
100 	register const struct atShortDDP *sdp;
101 	u_short snet;
102 	u_int hdrlen;
103 
104 #if 0
105 	/*
106 	 * Our packet is on a 4-byte boundary, as we're either called
107 	 * directly from a top-level link-layer printer (ltalk_if_print)
108 	 * or from the UDP printer.  The LLAP+DDP header is a multiple
109 	 * of 4 bytes in length, so the DDP payload is also on a 4-byte
110 	 * boundary, and we don't need to align it before calling
111 	 * "ddp_print()".
112 	 */
113 	lp = (const struct LAP *)bp;
114 	bp += sizeof(*lp);
115 	length -= sizeof(*lp);
116 #else
117 	{
118 		static struct LAP lp_ = {0, 0, lapDDP};
119 		lp = &lp_;
120 	}
121 #endif
122 	hdrlen = sizeof(*lp);
123 	switch (lp->type) {
124 
125 	case lapShortDDP:
126 		if (length < ddpSSize) {
127 			(void)printf(" [|sddp %d]", length);
128 			return (length);
129 		}
130 		sdp = (const struct atShortDDP *)bp;
131 		printf("%s.%s",
132 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
133 		printf(" > %s.%s:",
134 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
135 		bp += ddpSSize;
136 		length -= ddpSSize;
137 		hdrlen += ddpSSize;
138 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
139 		break;
140 
141 	case lapDDP:
142 		if (length < ddpSize) {
143 			(void)printf(" [|ddp %d]", length);
144 			return (length);
145 		}
146 		dp = (const struct atDDP *)bp;
147 		snet = EXTRACT_16BITS(&dp->srcNet);
148 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
149 		    ddpskt_string(dp->srcSkt));
150 		printf(" > %s.%s:",
151 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
152 		    ddpskt_string(dp->dstSkt));
153 		bp += ddpSize;
154 		length -= ddpSize;
155 		hdrlen += ddpSize;
156 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
157 		break;
158 
159 #ifdef notdef
160 	case lapKLAP:
161 		klap_print(bp, length);
162 		break;
163 #endif
164 
165 	default:
166 		printf("%d > %d at-lap#%d %d",
167 		    lp->src, lp->dst, lp->type, length);
168 		break;
169 	}
170 	return (hdrlen);
171 }
172 
173 /*
174  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
175  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
176  * packets in them).
177  */
178 void
179 atalk_print(register const u_char *bp, u_int length)
180 {
181 	register const struct atDDP *dp;
182 	u_short snet;
183 
184         if(!eflag)
185             printf("AT ");
186 
187 	if (length < ddpSize) {
188 		(void)printf(" [|ddp %d]", length);
189 		return;
190 	}
191 	dp = (const struct atDDP *)bp;
192 	snet = EXTRACT_16BITS(&dp->srcNet);
193 	printf("%s.%s", ataddr_string(snet, dp->srcNode),
194 	       ddpskt_string(dp->srcSkt));
195 	printf(" > %s.%s: ",
196 	       ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
197 	       ddpskt_string(dp->dstSkt));
198 	bp += ddpSize;
199 	length -= ddpSize;
200 	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
201 }
202 
203 /* XXX should probably pass in the snap header and do checks like arp_print() */
204 void
205 aarp_print(register const u_char *bp, u_int length)
206 {
207 	register const struct aarp *ap;
208 
209 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
210 
211 	printf("aarp ");
212 	ap = (const struct aarp *)bp;
213 	if (EXTRACT_16BITS(&ap->htype) == 1 &&
214 	    EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
215 	    ap->halen == 6 && ap->palen == 4 )
216 		switch (EXTRACT_16BITS(&ap->op)) {
217 
218 		case 1:				/* request */
219 			(void)printf("who-has %s tell %s",
220 			    AT(pdaddr), AT(psaddr));
221 			return;
222 
223 		case 2:				/* response */
224 			(void)printf("reply %s is-at %s",
225 			    AT(psaddr), etheraddr_string(ap->hsaddr));
226 			return;
227 
228 		case 3:				/* probe (oy!) */
229 			(void)printf("probe %s tell %s",
230 			    AT(pdaddr), AT(psaddr));
231 			return;
232 		}
233 	(void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
234 	    length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
235 	    EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen);
236 }
237 
238 /*
239  * Print AppleTalk Datagram Delivery Protocol packets.
240  */
241 static void
242 ddp_print(register const u_char *bp, register u_int length, register int t,
243 	  register u_short snet, register u_char snode, u_char skt)
244 {
245 
246 	switch (t) {
247 
248 	case ddpNBP:
249 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
250 		break;
251 
252 	case ddpATP:
253 		atp_print((const struct atATP *)bp, length);
254 		break;
255 
256 	case ddpEIGRP:
257 		eigrp_print(bp, length);
258 		break;
259 
260 	default:
261 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
262 		break;
263 	}
264 }
265 
266 static void
267 atp_print(register const struct atATP *ap, u_int length)
268 {
269 	char c;
270 	u_int32_t data;
271 
272 	if ((const u_char *)(ap + 1) > snapend) {
273 		/* Just bail if we don't have the whole chunk. */
274 		fputs(tstr, stdout);
275 		return;
276 	}
277 	length -= sizeof(*ap);
278 	switch (ap->control & 0xc0) {
279 
280 	case atpReqCode:
281 		(void)printf(" atp-req%s %d",
282 			     ap->control & atpXO? " " : "*",
283 			     EXTRACT_16BITS(&ap->transID));
284 
285 		atp_bitmap_print(ap->bitmap);
286 
287 		if (length != 0)
288 			(void)printf(" [len=%d]", length);
289 
290 		switch (ap->control & (atpEOM|atpSTS)) {
291 		case atpEOM:
292 			(void)printf(" [EOM]");
293 			break;
294 		case atpSTS:
295 			(void)printf(" [STS]");
296 			break;
297 		case atpEOM|atpSTS:
298 			(void)printf(" [EOM,STS]");
299 			break;
300 		}
301 		break;
302 
303 	case atpRspCode:
304 		(void)printf(" atp-resp%s%d:%d (%d)",
305 			     ap->control & atpEOM? "*" : " ",
306 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
307 		switch (ap->control & (atpXO|atpSTS)) {
308 		case atpXO:
309 			(void)printf(" [XO]");
310 			break;
311 		case atpSTS:
312 			(void)printf(" [STS]");
313 			break;
314 		case atpXO|atpSTS:
315 			(void)printf(" [XO,STS]");
316 			break;
317 		}
318 		break;
319 
320 	case atpRelCode:
321 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
322 
323 		atp_bitmap_print(ap->bitmap);
324 
325 		/* length should be zero */
326 		if (length)
327 			(void)printf(" [len=%d]", length);
328 
329 		/* there shouldn't be any control flags */
330 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
331 			c = '[';
332 			if (ap->control & atpXO) {
333 				(void)printf("%cXO", c);
334 				c = ',';
335 			}
336 			if (ap->control & atpEOM) {
337 				(void)printf("%cEOM", c);
338 				c = ',';
339 			}
340 			if (ap->control & atpSTS) {
341 				(void)printf("%cSTS", c);
342 				c = ',';
343 			}
344 			(void)printf("]");
345 		}
346 		break;
347 
348 	default:
349 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
350 			     EXTRACT_16BITS(&ap->transID), length);
351 		break;
352 	}
353 	data = EXTRACT_32BITS(&ap->userData);
354 	if (data != 0)
355 		(void)printf(" 0x%x", data);
356 }
357 
358 static void
359 atp_bitmap_print(register u_char bm)
360 {
361 	register char c;
362 	register int i;
363 
364 	/*
365 	 * The '& 0xff' below is needed for compilers that want to sign
366 	 * extend a u_char, which is the case with the Ultrix compiler.
367 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
368 	 */
369 	if ((bm + 1) & (bm & 0xff)) {
370 		c = '<';
371 		for (i = 0; bm; ++i) {
372 			if (bm & 1) {
373 				(void)printf("%c%d", c, i);
374 				c = ',';
375 			}
376 			bm >>= 1;
377 		}
378 		(void)printf(">");
379 	} else {
380 		for (i = 0; bm; ++i)
381 			bm >>= 1;
382 		if (i > 1)
383 			(void)printf("<0-%d>", i - 1);
384 		else
385 			(void)printf("<0>");
386 	}
387 }
388 
389 static void
390 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
391 	  register u_char snode, register u_char skt)
392 {
393 	register const struct atNBPtuple *tp =
394 		(const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
395 	int i;
396 	const u_char *ep;
397 
398 	if (length < nbpHeaderSize) {
399 		(void)printf(" truncated-nbp %d", length);
400 		return;
401 	}
402 
403 	length -= nbpHeaderSize;
404 	if (length < 8) {
405 		/* must be room for at least one tuple */
406 		(void)printf(" truncated-nbp %d", length + nbpHeaderSize);
407 		return;
408 	}
409 	/* ep points to end of available data */
410 	ep = snapend;
411 	if ((const u_char *)tp > ep) {
412 		fputs(tstr, stdout);
413 		return;
414 	}
415 	switch (i = np->control & 0xf0) {
416 
417 	case nbpBrRq:
418 	case nbpLkUp:
419 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
420 			     np->id);
421 		if ((const u_char *)(tp + 1) > ep) {
422 			fputs(tstr, stdout);
423 			return;
424 		}
425 		(void)nbp_name_print(tp, ep);
426 		/*
427 		 * look for anomalies: the spec says there can only
428 		 * be one tuple, the address must match the source
429 		 * address and the enumerator should be zero.
430 		 */
431 		if ((np->control & 0xf) != 1)
432 			(void)printf(" [ntup=%d]", np->control & 0xf);
433 		if (tp->enumerator)
434 			(void)printf(" [enum=%d]", tp->enumerator);
435 		if (EXTRACT_16BITS(&tp->net) != snet ||
436 		    tp->node != snode || tp->skt != skt)
437 			(void)printf(" [addr=%s.%d]",
438 			    ataddr_string(EXTRACT_16BITS(&tp->net),
439 			    tp->node), tp->skt);
440 		break;
441 
442 	case nbpLkUpReply:
443 		(void)printf(" nbp-reply %d:", np->id);
444 
445 		/* print each of the tuples in the reply */
446 		for (i = np->control & 0xf; --i >= 0 && tp; )
447 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
448 		break;
449 
450 	default:
451 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
452 				length);
453 		break;
454 	}
455 }
456 
457 /* print a counted string */
458 static const char *
459 print_cstring(register const char *cp, register const u_char *ep)
460 {
461 	register u_int length;
462 
463 	if (cp >= (const char *)ep) {
464 		fputs(tstr, stdout);
465 		return (0);
466 	}
467 	length = *cp++;
468 
469 	/* Spec says string can be at most 32 bytes long */
470 	if (length > 32) {
471 		(void)printf("[len=%u]", length);
472 		return (0);
473 	}
474 	while ((int)--length >= 0) {
475 		if (cp >= (const char *)ep) {
476 			fputs(tstr, stdout);
477 			return (0);
478 		}
479 		putchar(*cp++);
480 	}
481 	return (cp);
482 }
483 
484 static const struct atNBPtuple *
485 nbp_tuple_print(register const struct atNBPtuple *tp,
486 		register const u_char *ep,
487 		register u_short snet, register u_char snode,
488 		register u_char skt)
489 {
490 	register const struct atNBPtuple *tpn;
491 
492 	if ((const u_char *)(tp + 1) > ep) {
493 		fputs(tstr, stdout);
494 		return 0;
495 	}
496 	tpn = nbp_name_print(tp, ep);
497 
498 	/* if the enumerator isn't 1, print it */
499 	if (tp->enumerator != 1)
500 		(void)printf("(%d)", tp->enumerator);
501 
502 	/* if the socket doesn't match the src socket, print it */
503 	if (tp->skt != skt)
504 		(void)printf(" %d", tp->skt);
505 
506 	/* if the address doesn't match the src address, it's an anomaly */
507 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
508 		(void)printf(" [addr=%s]",
509 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
510 
511 	return (tpn);
512 }
513 
514 static const struct atNBPtuple *
515 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
516 {
517 	register const char *cp = (const char *)tp + nbpTupleSize;
518 
519 	putchar(' ');
520 
521 	/* Object */
522 	putchar('"');
523 	if ((cp = print_cstring(cp, ep)) != NULL) {
524 		/* Type */
525 		putchar(':');
526 		if ((cp = print_cstring(cp, ep)) != NULL) {
527 			/* Zone */
528 			putchar('@');
529 			if ((cp = print_cstring(cp, ep)) != NULL)
530 				putchar('"');
531 		}
532 	}
533 	return ((const struct atNBPtuple *)cp);
534 }
535 
536 
537 #define HASHNAMESIZE 4096
538 
539 struct hnamemem {
540 	int addr;
541 	char *name;
542 	struct hnamemem *nxt;
543 };
544 
545 static struct hnamemem hnametable[HASHNAMESIZE];
546 
547 static const char *
548 ataddr_string(u_short atnet, u_char athost)
549 {
550 	register struct hnamemem *tp, *tp2;
551 	register int i = (atnet << 8) | athost;
552 	char nambuf[MAXHOSTNAMELEN + 20];
553 	static int first = 1;
554 	FILE *fp;
555 
556 	/*
557 	 * if this is the first call, see if there's an AppleTalk
558 	 * number to name map file.
559 	 */
560 	if (first && (first = 0, !nflag)
561 	    && (fp = fopen("/etc/atalk.names", "r"))) {
562 		char line[256];
563 		int i1, i2, i3;
564 
565 		while (fgets(line, sizeof(line), fp)) {
566 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
567 				continue;
568 			if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
569 				     nambuf) == 4)
570 				/* got a hostname. */
571 				i3 |= ((i1 << 8) | i2) << 8;
572 			else if (sscanf(line, "%d.%d %256s", &i1, &i2,
573 					nambuf) == 3)
574 				/* got a net name */
575 				i3 = (((i1 << 8) | i2) << 8) | 255;
576 			else
577 				continue;
578 
579 			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
580 			     tp->nxt; tp = tp->nxt)
581 				;
582 			tp->addr = i2;
583 			tp->nxt = newhnamemem();
584 			tp->name = strdup(nambuf);
585 		}
586 		fclose(fp);
587 	}
588 
589 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
590 		if (tp->addr == i)
591 			return (tp->name);
592 
593 	/* didn't have the node name -- see if we've got the net name */
594 	i |= 255;
595 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
596 		if (tp2->addr == i) {
597 			tp->addr = (atnet << 8) | athost;
598 			tp->nxt = newhnamemem();
599 			(void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
600 			    tp2->name, athost);
601 			tp->name = strdup(nambuf);
602 			return (tp->name);
603 		}
604 
605 	tp->addr = (atnet << 8) | athost;
606 	tp->nxt = newhnamemem();
607 	if (athost != 255)
608 		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
609 		    atnet >> 8, atnet & 0xff, athost);
610 	else
611 		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
612 		    atnet & 0xff);
613 	tp->name = strdup(nambuf);
614 
615 	return (tp->name);
616 }
617 
618 static struct tok skt2str[] = {
619 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
620 	{ nbpSkt,	"nis" },	/* name info socket */
621 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
622 	{ zipSkt,	"zip" },	/* zone info protocol */
623 	{ 0,		NULL }
624 };
625 
626 static const char *
627 ddpskt_string(register int skt)
628 {
629 	static char buf[8];
630 
631 	if (nflag) {
632 		(void)snprintf(buf, sizeof(buf), "%d", skt);
633 		return (buf);
634 	}
635 	return (tok2str(skt2str, "%d", skt));
636 }
637