xref: /freebsd/contrib/tcpdump/print-atalk.c (revision 6990ffd8a95caaba6858ad44ff1b3157d1efba8f) 
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[] =
28     "@(#) $Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.64 2000/10/30 06:22:14 guy Exp $ (LBL)";
29 #endif
30 
31 #ifdef HAVE_CONFIG_H
32 #include "config.h"
33 #endif
34 
35 #include <sys/param.h>
36 #include <sys/time.h>
37 #include <sys/socket.h>
38 
39 #include <netinet/in.h>
40 
41 #include <stdio.h>
42 #include <stdlib.h>
43 #include <string.h>
44 #include <netdb.h>		/* for MAXHOSTNAMELEN on some platforms */
45 
46 #include "interface.h"
47 #include "addrtoname.h"
48 #include "ethertype.h"
49 #include "extract.h"			/* must come after interface.h */
50 #include "appletalk.h"
51 #include "savestr.h"
52 
53 static struct tok type2str[] = {
54 	{ ddpRTMP,		"rtmp" },
55 	{ ddpRTMPrequest,	"rtmpReq" },
56 	{ ddpECHO,		"echo" },
57 	{ ddpIP,		"IP" },
58 	{ ddpARP,		"ARP" },
59 	{ ddpKLAP,		"KLAP" },
60 	{ 0,			NULL }
61 };
62 
63 struct aarp {
64 	u_int16_t	htype, ptype;
65 	u_int8_t	halen, palen;
66 	u_int16_t	op;
67 	u_int8_t	hsaddr[6];
68 	u_int8_t	psaddr[4];
69 	u_int8_t	hdaddr[6];
70 	u_int8_t	pdaddr[4];
71 };
72 
73 static char tstr[] = "[|atalk]";
74 
75 static void atp_print(const struct atATP *, u_int);
76 static void atp_bitmap_print(u_char);
77 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
78 static const char *print_cstring(const char *, const u_char *);
79 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
80 						const u_char *,
81 						u_short, u_char, u_char);
82 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
83 					       const u_char *);
84 static const char *ataddr_string(u_short, u_char);
85 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
86 static const char *ddpskt_string(int);
87 
88 /*
89  * Print AppleTalk LLAP packets.
90  */
91 void
92 llap_print(register const u_char *bp, u_int length)
93 {
94 	register const struct LAP *lp;
95 	register const struct atDDP *dp;
96 	register const struct atShortDDP *sdp;
97 	u_short snet;
98 
99 #if 0
100 	lp = (struct LAP *)bp;
101 	bp += sizeof(*lp);
102 	length -= sizeof(*lp);
103 #else
104 	{
105 		static struct LAP lp_ = {0, 0, lapDDP};
106 		lp = &lp_;
107 	}
108 #endif
109 	switch (lp->type) {
110 
111 	case lapShortDDP:
112 		if (length < ddpSSize) {
113 			(void)printf(" [|sddp %d]", length);
114 			return;
115 		}
116 		sdp = (const struct atShortDDP *)bp;
117 		printf("%s.%s",
118 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
119 		printf(" > %s.%s:",
120 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
121 		bp += ddpSSize;
122 		length -= ddpSSize;
123 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
124 		break;
125 
126 	case lapDDP:
127 		if (length < ddpSize) {
128 			(void)printf(" [|ddp %d]", length);
129 			return;
130 		}
131 		dp = (const struct atDDP *)bp;
132 		snet = EXTRACT_16BITS(&dp->srcNet);
133 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
134 		    ddpskt_string(dp->srcSkt));
135 		printf(" > %s.%s:",
136 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
137 		    ddpskt_string(dp->dstSkt));
138 		bp += ddpSize;
139 		length -= ddpSize;
140 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
141 		break;
142 
143 #ifdef notdef
144 	case lapKLAP:
145 		klap_print(bp, length);
146 		break;
147 #endif
148 
149 	default:
150 		printf("%d > %d at-lap#%d %d",
151 		    lp->src, lp->dst, lp->type, length);
152 		break;
153 	}
154 }
155 
156 /*
157  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
158  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
159  * packets in them).
160  */
161 void
162 atalk_print(register const u_char *bp, u_int length)
163 {
164 	register const struct atDDP *dp;
165 	u_short snet;
166 
167 	if (length < ddpSize) {
168 	  (void)printf(" [|ddp %d]", length);
169 	  return;
170 	}
171 	dp = (const struct atDDP *)bp;
172 	snet = EXTRACT_16BITS(&dp->srcNet);
173 	printf("%s.%s", ataddr_string(snet, dp->srcNode),
174 	       ddpskt_string(dp->srcSkt));
175 	printf(" > %s.%s:",
176 	       ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
177 	       ddpskt_string(dp->dstSkt));
178 	bp += ddpSize;
179 	length -= ddpSize;
180 	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
181 }
182 
183 /* XXX should probably pass in the snap header and do checks like arp_print() */
184 void
185 aarp_print(register const u_char *bp, u_int length)
186 {
187 	register const struct aarp *ap;
188 
189 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
190 
191 	printf("aarp ");
192 	ap = (const struct aarp *)bp;
193 	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
194 	    ap->halen == 6 && ap->palen == 4 )
195 		switch (ntohs(ap->op)) {
196 
197 		case 1:				/* request */
198 			(void)printf("who-has %s tell %s",
199 			    AT(pdaddr), AT(psaddr));
200 			return;
201 
202 		case 2:				/* response */
203 			(void)printf("reply %s is-at %s",
204 			    AT(psaddr), etheraddr_string(ap->hsaddr));
205 			return;
206 
207 		case 3:				/* probe (oy!) */
208 			(void)printf("probe %s tell %s",
209 			    AT(pdaddr), AT(psaddr));
210 			return;
211 		}
212 	(void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
213 	    length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
214 	    ap->halen, ap->palen);
215 }
216 
217 /*
218  * Print AppleTalk Datagram Delivery Protocol packets.
219  */
220 static void
221 ddp_print(register const u_char *bp, register u_int length, register int t,
222 	  register u_short snet, register u_char snode, u_char skt)
223 {
224 
225 	switch (t) {
226 
227 	case ddpNBP:
228 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
229 		break;
230 
231 	case ddpATP:
232 		atp_print((const struct atATP *)bp, length);
233 		break;
234 
235 	default:
236 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
237 		break;
238 	}
239 }
240 
241 static void
242 atp_print(register const struct atATP *ap, u_int length)
243 {
244 	char c;
245 	u_int32_t data;
246 
247 	if ((const u_char *)(ap + 1) > snapend) {
248 		/* Just bail if we don't have the whole chunk. */
249 		fputs(tstr, stdout);
250 		return;
251 	}
252 	length -= sizeof(*ap);
253 	switch (ap->control & 0xc0) {
254 
255 	case atpReqCode:
256 		(void)printf(" atp-req%s %d",
257 			     ap->control & atpXO? " " : "*",
258 			     EXTRACT_16BITS(&ap->transID));
259 
260 		atp_bitmap_print(ap->bitmap);
261 
262 		if (length != 0)
263 			(void)printf(" [len=%d]", length);
264 
265 		switch (ap->control & (atpEOM|atpSTS)) {
266 		case atpEOM:
267 			(void)printf(" [EOM]");
268 			break;
269 		case atpSTS:
270 			(void)printf(" [STS]");
271 			break;
272 		case atpEOM|atpSTS:
273 			(void)printf(" [EOM,STS]");
274 			break;
275 		}
276 		break;
277 
278 	case atpRspCode:
279 		(void)printf(" atp-resp%s%d:%d (%d)",
280 			     ap->control & atpEOM? "*" : " ",
281 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
282 		switch (ap->control & (atpXO|atpSTS)) {
283 		case atpXO:
284 			(void)printf(" [XO]");
285 			break;
286 		case atpSTS:
287 			(void)printf(" [STS]");
288 			break;
289 		case atpXO|atpSTS:
290 			(void)printf(" [XO,STS]");
291 			break;
292 		}
293 		break;
294 
295 	case atpRelCode:
296 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
297 
298 		atp_bitmap_print(ap->bitmap);
299 
300 		/* length should be zero */
301 		if (length)
302 			(void)printf(" [len=%d]", length);
303 
304 		/* there shouldn't be any control flags */
305 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
306 			c = '[';
307 			if (ap->control & atpXO) {
308 				(void)printf("%cXO", c);
309 				c = ',';
310 			}
311 			if (ap->control & atpEOM) {
312 				(void)printf("%cEOM", c);
313 				c = ',';
314 			}
315 			if (ap->control & atpSTS) {
316 				(void)printf("%cSTS", c);
317 				c = ',';
318 			}
319 			(void)printf("]");
320 		}
321 		break;
322 
323 	default:
324 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
325 			     EXTRACT_16BITS(&ap->transID), length);
326 		break;
327 	}
328 	data = EXTRACT_32BITS(&ap->userData);
329 	if (data != 0)
330 		(void)printf(" 0x%x", data);
331 }
332 
333 static void
334 atp_bitmap_print(register u_char bm)
335 {
336 	register char c;
337 	register int i;
338 
339 	/*
340 	 * The '& 0xff' below is needed for compilers that want to sign
341 	 * extend a u_char, which is the case with the Ultrix compiler.
342 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
343 	 */
344 	if ((bm + 1) & (bm & 0xff)) {
345 		c = '<';
346 		for (i = 0; bm; ++i) {
347 			if (bm & 1) {
348 				(void)printf("%c%d", c, i);
349 				c = ',';
350 			}
351 			bm >>= 1;
352 		}
353 		(void)printf(">");
354 	} else {
355 		for (i = 0; bm; ++i)
356 			bm >>= 1;
357 		if (i > 1)
358 			(void)printf("<0-%d>", i - 1);
359 		else
360 			(void)printf("<0>");
361 	}
362 }
363 
364 static void
365 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
366 	  register u_char snode, register u_char skt)
367 {
368 	register const struct atNBPtuple *tp =
369 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
370 	int i;
371 	const u_char *ep;
372 
373 	length -= nbpHeaderSize;
374 	if (length < 8) {
375 		/* must be room for at least one tuple */
376 		(void)printf(" truncated-nbp %d", length + nbpHeaderSize);
377 		return;
378 	}
379 	/* ep points to end of available data */
380 	ep = snapend;
381 	if ((const u_char *)tp > ep) {
382 		fputs(tstr, stdout);
383 		return;
384 	}
385 	switch (i = np->control & 0xf0) {
386 
387 	case nbpBrRq:
388 	case nbpLkUp:
389 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
390 			     np->id);
391 		if ((const u_char *)(tp + 1) > ep) {
392 			fputs(tstr, stdout);
393 			return;
394 		}
395 		(void)nbp_name_print(tp, ep);
396 		/*
397 		 * look for anomalies: the spec says there can only
398 		 * be one tuple, the address must match the source
399 		 * address and the enumerator should be zero.
400 		 */
401 		if ((np->control & 0xf) != 1)
402 			(void)printf(" [ntup=%d]", np->control & 0xf);
403 		if (tp->enumerator)
404 			(void)printf(" [enum=%d]", tp->enumerator);
405 		if (EXTRACT_16BITS(&tp->net) != snet ||
406 		    tp->node != snode || tp->skt != skt)
407 			(void)printf(" [addr=%s.%d]",
408 			    ataddr_string(EXTRACT_16BITS(&tp->net),
409 			    tp->node), tp->skt);
410 		break;
411 
412 	case nbpLkUpReply:
413 		(void)printf(" nbp-reply %d:", np->id);
414 
415 		/* print each of the tuples in the reply */
416 		for (i = np->control & 0xf; --i >= 0 && tp; )
417 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
418 		break;
419 
420 	default:
421 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
422 				length);
423 		break;
424 	}
425 }
426 
427 /* print a counted string */
428 static const char *
429 print_cstring(register const char *cp, register const u_char *ep)
430 {
431 	register u_int length;
432 
433 	if (cp >= (const char *)ep) {
434 		fputs(tstr, stdout);
435 		return (0);
436 	}
437 	length = *cp++;
438 
439 	/* Spec says string can be at most 32 bytes long */
440 	if (length > 32) {
441 		(void)printf("[len=%u]", length);
442 		return (0);
443 	}
444 	while ((int)--length >= 0) {
445 		if (cp >= (char *)ep) {
446 			fputs(tstr, stdout);
447 			return (0);
448 		}
449 		putchar(*cp++);
450 	}
451 	return (cp);
452 }
453 
454 static const struct atNBPtuple *
455 nbp_tuple_print(register const struct atNBPtuple *tp,
456 		register const u_char *ep,
457 		register u_short snet, register u_char snode,
458 		register u_char skt)
459 {
460 	register const struct atNBPtuple *tpn;
461 
462 	if ((const u_char *)(tp + 1) > ep) {
463 		fputs(tstr, stdout);
464 		return 0;
465 	}
466 	tpn = nbp_name_print(tp, ep);
467 
468 	/* if the enumerator isn't 1, print it */
469 	if (tp->enumerator != 1)
470 		(void)printf("(%d)", tp->enumerator);
471 
472 	/* if the socket doesn't match the src socket, print it */
473 	if (tp->skt != skt)
474 		(void)printf(" %d", tp->skt);
475 
476 	/* if the address doesn't match the src address, it's an anomaly */
477 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
478 		(void)printf(" [addr=%s]",
479 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
480 
481 	return (tpn);
482 }
483 
484 static const struct atNBPtuple *
485 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
486 {
487 	register const char *cp = (const char *)tp + nbpTupleSize;
488 
489 	putchar(' ');
490 
491 	/* Object */
492 	putchar('"');
493 	if ((cp = print_cstring(cp, ep)) != NULL) {
494 		/* Type */
495 		putchar(':');
496 		if ((cp = print_cstring(cp, ep)) != NULL) {
497 			/* Zone */
498 			putchar('@');
499 			if ((cp = print_cstring(cp, ep)) != NULL)
500 				putchar('"');
501 		}
502 	}
503 	return ((const struct atNBPtuple *)cp);
504 }
505 
506 
507 #define HASHNAMESIZE 4096
508 
509 struct hnamemem {
510 	int addr;
511 	char *name;
512 	struct hnamemem *nxt;
513 };
514 
515 static struct hnamemem hnametable[HASHNAMESIZE];
516 
517 static const char *
518 ataddr_string(u_short atnet, u_char athost)
519 {
520 	register struct hnamemem *tp, *tp2;
521 	register int i = (atnet << 8) | athost;
522 	char nambuf[MAXHOSTNAMELEN + 20];
523 	static int first = 1;
524 	FILE *fp;
525 
526 	/*
527 	 * if this is the first call, see if there's an AppleTalk
528 	 * number to name map file.
529 	 */
530 	if (first && (first = 0, !nflag)
531 	    && (fp = fopen("/etc/atalk.names", "r"))) {
532 		char line[256];
533 		int i1, i2, i3;
534 
535 		while (fgets(line, sizeof(line), fp)) {
536 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
537 				continue;
538 			if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
539 				     nambuf) == 4)
540 				/* got a hostname. */
541 				i3 |= ((i1 << 8) | i2) << 8;
542 			else if (sscanf(line, "%d.%d %256s", &i1, &i2,
543 					nambuf) == 3)
544 				/* got a net name */
545 				i3 = (((i1 << 8) | i2) << 8) | 255;
546 			else
547 				continue;
548 
549 			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
550 			     tp->nxt; tp = tp->nxt)
551 				;
552 			tp->addr = i2;
553 			tp->nxt = newhnamemem();
554 			tp->name = savestr(nambuf);
555 		}
556 		fclose(fp);
557 	}
558 
559 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
560 		if (tp->addr == i)
561 			return (tp->name);
562 
563 	/* didn't have the node name -- see if we've got the net name */
564 	i |= 255;
565 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
566 		if (tp2->addr == i) {
567 			tp->addr = (atnet << 8) | athost;
568 			tp->nxt = newhnamemem();
569 			(void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
570 			    tp2->name, athost);
571 			tp->name = savestr(nambuf);
572 			return (tp->name);
573 		}
574 
575 	tp->addr = (atnet << 8) | athost;
576 	tp->nxt = newhnamemem();
577 	if (athost != 255)
578 		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
579 		    atnet >> 8, atnet & 0xff, athost);
580 	else
581 		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
582 		    atnet & 0xff);
583 	tp->name = savestr(nambuf);
584 
585 	return (tp->name);
586 }
587 
588 static struct tok skt2str[] = {
589 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
590 	{ nbpSkt,	"nis" },	/* name info socket */
591 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
592 	{ zipSkt,	"zip" },	/* zone info protocol */
593 	{ 0,		NULL }
594 };
595 
596 static const char *
597 ddpskt_string(register int skt)
598 {
599 	static char buf[8];
600 
601 	if (nflag) {
602 		(void)snprintf(buf, sizeof(buf), "%d", skt);
603 		return (buf);
604 	}
605 	return (tok2str(skt2str, "%d", skt));
606 }
607