xref: /freebsd/contrib/tcpdump/print-atalk.c (revision d37ea99837e6ad50837fd9fe1771ddf1c3ba6002) 
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 1.78.2.2 2003/11/16 08:51:11 guy 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 (length < ddpSize) {
185 		(void)printf(" [|ddp %d]", length);
186 		return;
187 	}
188 	dp = (const struct atDDP *)bp;
189 	snet = EXTRACT_16BITS(&dp->srcNet);
190 	printf("%s.%s", ataddr_string(snet, dp->srcNode),
191 	       ddpskt_string(dp->srcSkt));
192 	printf(" > %s.%s:",
193 	       ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
194 	       ddpskt_string(dp->dstSkt));
195 	bp += ddpSize;
196 	length -= ddpSize;
197 	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
198 }
199 
200 /* XXX should probably pass in the snap header and do checks like arp_print() */
201 void
202 aarp_print(register const u_char *bp, u_int length)
203 {
204 	register const struct aarp *ap;
205 
206 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
207 
208 	printf("aarp ");
209 	ap = (const struct aarp *)bp;
210 	if (EXTRACT_16BITS(&ap->htype) == 1 &&
211 	    EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
212 	    ap->halen == 6 && ap->palen == 4 )
213 		switch (EXTRACT_16BITS(&ap->op)) {
214 
215 		case 1:				/* request */
216 			(void)printf("who-has %s tell %s",
217 			    AT(pdaddr), AT(psaddr));
218 			return;
219 
220 		case 2:				/* response */
221 			(void)printf("reply %s is-at %s",
222 			    AT(psaddr), etheraddr_string(ap->hsaddr));
223 			return;
224 
225 		case 3:				/* probe (oy!) */
226 			(void)printf("probe %s tell %s",
227 			    AT(pdaddr), AT(psaddr));
228 			return;
229 		}
230 	(void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
231 	    length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
232 	    EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen);
233 }
234 
235 /*
236  * Print AppleTalk Datagram Delivery Protocol packets.
237  */
238 static void
239 ddp_print(register const u_char *bp, register u_int length, register int t,
240 	  register u_short snet, register u_char snode, u_char skt)
241 {
242 
243 	switch (t) {
244 
245 	case ddpNBP:
246 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
247 		break;
248 
249 	case ddpATP:
250 		atp_print((const struct atATP *)bp, length);
251 		break;
252 
253 	default:
254 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
255 		break;
256 	}
257 }
258 
259 static void
260 atp_print(register const struct atATP *ap, u_int length)
261 {
262 	char c;
263 	u_int32_t data;
264 
265 	if ((const u_char *)(ap + 1) > snapend) {
266 		/* Just bail if we don't have the whole chunk. */
267 		fputs(tstr, stdout);
268 		return;
269 	}
270 	length -= sizeof(*ap);
271 	switch (ap->control & 0xc0) {
272 
273 	case atpReqCode:
274 		(void)printf(" atp-req%s %d",
275 			     ap->control & atpXO? " " : "*",
276 			     EXTRACT_16BITS(&ap->transID));
277 
278 		atp_bitmap_print(ap->bitmap);
279 
280 		if (length != 0)
281 			(void)printf(" [len=%d]", length);
282 
283 		switch (ap->control & (atpEOM|atpSTS)) {
284 		case atpEOM:
285 			(void)printf(" [EOM]");
286 			break;
287 		case atpSTS:
288 			(void)printf(" [STS]");
289 			break;
290 		case atpEOM|atpSTS:
291 			(void)printf(" [EOM,STS]");
292 			break;
293 		}
294 		break;
295 
296 	case atpRspCode:
297 		(void)printf(" atp-resp%s%d:%d (%d)",
298 			     ap->control & atpEOM? "*" : " ",
299 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
300 		switch (ap->control & (atpXO|atpSTS)) {
301 		case atpXO:
302 			(void)printf(" [XO]");
303 			break;
304 		case atpSTS:
305 			(void)printf(" [STS]");
306 			break;
307 		case atpXO|atpSTS:
308 			(void)printf(" [XO,STS]");
309 			break;
310 		}
311 		break;
312 
313 	case atpRelCode:
314 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
315 
316 		atp_bitmap_print(ap->bitmap);
317 
318 		/* length should be zero */
319 		if (length)
320 			(void)printf(" [len=%d]", length);
321 
322 		/* there shouldn't be any control flags */
323 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
324 			c = '[';
325 			if (ap->control & atpXO) {
326 				(void)printf("%cXO", c);
327 				c = ',';
328 			}
329 			if (ap->control & atpEOM) {
330 				(void)printf("%cEOM", c);
331 				c = ',';
332 			}
333 			if (ap->control & atpSTS) {
334 				(void)printf("%cSTS", c);
335 				c = ',';
336 			}
337 			(void)printf("]");
338 		}
339 		break;
340 
341 	default:
342 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
343 			     EXTRACT_16BITS(&ap->transID), length);
344 		break;
345 	}
346 	data = EXTRACT_32BITS(&ap->userData);
347 	if (data != 0)
348 		(void)printf(" 0x%x", data);
349 }
350 
351 static void
352 atp_bitmap_print(register u_char bm)
353 {
354 	register char c;
355 	register int i;
356 
357 	/*
358 	 * The '& 0xff' below is needed for compilers that want to sign
359 	 * extend a u_char, which is the case with the Ultrix compiler.
360 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
361 	 */
362 	if ((bm + 1) & (bm & 0xff)) {
363 		c = '<';
364 		for (i = 0; bm; ++i) {
365 			if (bm & 1) {
366 				(void)printf("%c%d", c, i);
367 				c = ',';
368 			}
369 			bm >>= 1;
370 		}
371 		(void)printf(">");
372 	} else {
373 		for (i = 0; bm; ++i)
374 			bm >>= 1;
375 		if (i > 1)
376 			(void)printf("<0-%d>", i - 1);
377 		else
378 			(void)printf("<0>");
379 	}
380 }
381 
382 static void
383 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
384 	  register u_char snode, register u_char skt)
385 {
386 	register const struct atNBPtuple *tp =
387 		(const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
388 	int i;
389 	const u_char *ep;
390 
391 	if (length < nbpHeaderSize) {
392 		(void)printf(" truncated-nbp %d", length);
393 		return;
394 	}
395 
396 	length -= nbpHeaderSize;
397 	if (length < 8) {
398 		/* must be room for at least one tuple */
399 		(void)printf(" truncated-nbp %d", length + nbpHeaderSize);
400 		return;
401 	}
402 	/* ep points to end of available data */
403 	ep = snapend;
404 	if ((const u_char *)tp > ep) {
405 		fputs(tstr, stdout);
406 		return;
407 	}
408 	switch (i = np->control & 0xf0) {
409 
410 	case nbpBrRq:
411 	case nbpLkUp:
412 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
413 			     np->id);
414 		if ((const u_char *)(tp + 1) > ep) {
415 			fputs(tstr, stdout);
416 			return;
417 		}
418 		(void)nbp_name_print(tp, ep);
419 		/*
420 		 * look for anomalies: the spec says there can only
421 		 * be one tuple, the address must match the source
422 		 * address and the enumerator should be zero.
423 		 */
424 		if ((np->control & 0xf) != 1)
425 			(void)printf(" [ntup=%d]", np->control & 0xf);
426 		if (tp->enumerator)
427 			(void)printf(" [enum=%d]", tp->enumerator);
428 		if (EXTRACT_16BITS(&tp->net) != snet ||
429 		    tp->node != snode || tp->skt != skt)
430 			(void)printf(" [addr=%s.%d]",
431 			    ataddr_string(EXTRACT_16BITS(&tp->net),
432 			    tp->node), tp->skt);
433 		break;
434 
435 	case nbpLkUpReply:
436 		(void)printf(" nbp-reply %d:", np->id);
437 
438 		/* print each of the tuples in the reply */
439 		for (i = np->control & 0xf; --i >= 0 && tp; )
440 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
441 		break;
442 
443 	default:
444 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
445 				length);
446 		break;
447 	}
448 }
449 
450 /* print a counted string */
451 static const char *
452 print_cstring(register const char *cp, register const u_char *ep)
453 {
454 	register u_int length;
455 
456 	if (cp >= (const char *)ep) {
457 		fputs(tstr, stdout);
458 		return (0);
459 	}
460 	length = *cp++;
461 
462 	/* Spec says string can be at most 32 bytes long */
463 	if (length > 32) {
464 		(void)printf("[len=%u]", length);
465 		return (0);
466 	}
467 	while ((int)--length >= 0) {
468 		if (cp >= (const char *)ep) {
469 			fputs(tstr, stdout);
470 			return (0);
471 		}
472 		putchar(*cp++);
473 	}
474 	return (cp);
475 }
476 
477 static const struct atNBPtuple *
478 nbp_tuple_print(register const struct atNBPtuple *tp,
479 		register const u_char *ep,
480 		register u_short snet, register u_char snode,
481 		register u_char skt)
482 {
483 	register const struct atNBPtuple *tpn;
484 
485 	if ((const u_char *)(tp + 1) > ep) {
486 		fputs(tstr, stdout);
487 		return 0;
488 	}
489 	tpn = nbp_name_print(tp, ep);
490 
491 	/* if the enumerator isn't 1, print it */
492 	if (tp->enumerator != 1)
493 		(void)printf("(%d)", tp->enumerator);
494 
495 	/* if the socket doesn't match the src socket, print it */
496 	if (tp->skt != skt)
497 		(void)printf(" %d", tp->skt);
498 
499 	/* if the address doesn't match the src address, it's an anomaly */
500 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
501 		(void)printf(" [addr=%s]",
502 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
503 
504 	return (tpn);
505 }
506 
507 static const struct atNBPtuple *
508 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
509 {
510 	register const char *cp = (const char *)tp + nbpTupleSize;
511 
512 	putchar(' ');
513 
514 	/* Object */
515 	putchar('"');
516 	if ((cp = print_cstring(cp, ep)) != NULL) {
517 		/* Type */
518 		putchar(':');
519 		if ((cp = print_cstring(cp, ep)) != NULL) {
520 			/* Zone */
521 			putchar('@');
522 			if ((cp = print_cstring(cp, ep)) != NULL)
523 				putchar('"');
524 		}
525 	}
526 	return ((const struct atNBPtuple *)cp);
527 }
528 
529 
530 #define HASHNAMESIZE 4096
531 
532 struct hnamemem {
533 	int addr;
534 	char *name;
535 	struct hnamemem *nxt;
536 };
537 
538 static struct hnamemem hnametable[HASHNAMESIZE];
539 
540 static const char *
541 ataddr_string(u_short atnet, u_char athost)
542 {
543 	register struct hnamemem *tp, *tp2;
544 	register int i = (atnet << 8) | athost;
545 	char nambuf[MAXHOSTNAMELEN + 20];
546 	static int first = 1;
547 	FILE *fp;
548 
549 	/*
550 	 * if this is the first call, see if there's an AppleTalk
551 	 * number to name map file.
552 	 */
553 	if (first && (first = 0, !nflag)
554 	    && (fp = fopen("/etc/atalk.names", "r"))) {
555 		char line[256];
556 		int i1, i2, i3;
557 
558 		while (fgets(line, sizeof(line), fp)) {
559 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
560 				continue;
561 			if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
562 				     nambuf) == 4)
563 				/* got a hostname. */
564 				i3 |= ((i1 << 8) | i2) << 8;
565 			else if (sscanf(line, "%d.%d %256s", &i1, &i2,
566 					nambuf) == 3)
567 				/* got a net name */
568 				i3 = (((i1 << 8) | i2) << 8) | 255;
569 			else
570 				continue;
571 
572 			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
573 			     tp->nxt; tp = tp->nxt)
574 				;
575 			tp->addr = i2;
576 			tp->nxt = newhnamemem();
577 			tp->name = strdup(nambuf);
578 		}
579 		fclose(fp);
580 	}
581 
582 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
583 		if (tp->addr == i)
584 			return (tp->name);
585 
586 	/* didn't have the node name -- see if we've got the net name */
587 	i |= 255;
588 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
589 		if (tp2->addr == i) {
590 			tp->addr = (atnet << 8) | athost;
591 			tp->nxt = newhnamemem();
592 			(void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
593 			    tp2->name, athost);
594 			tp->name = strdup(nambuf);
595 			return (tp->name);
596 		}
597 
598 	tp->addr = (atnet << 8) | athost;
599 	tp->nxt = newhnamemem();
600 	if (athost != 255)
601 		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
602 		    atnet >> 8, atnet & 0xff, athost);
603 	else
604 		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
605 		    atnet & 0xff);
606 	tp->name = strdup(nambuf);
607 
608 	return (tp->name);
609 }
610 
611 static struct tok skt2str[] = {
612 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
613 	{ nbpSkt,	"nis" },	/* name info socket */
614 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
615 	{ zipSkt,	"zip" },	/* zone info protocol */
616 	{ 0,		NULL }
617 };
618 
619 static const char *
620 ddpskt_string(register int skt)
621 {
622 	static char buf[8];
623 
624 	if (nflag) {
625 		(void)snprintf(buf, sizeof(buf), "%d", skt);
626 		return (buf);
627 	}
628 	return (tok2str(skt2str, "%d", skt));
629 }
630