xref: /freebsd/contrib/tcpdump/print-atalk.c (revision ae83180158c4c937f170e31eff311b18c0286a93) 
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 1.70 2001/11/15 08:23:12 itojun 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 #include <pcap.h>
46 
47 #include "interface.h"
48 #include "addrtoname.h"
49 #include "ethertype.h"
50 #include "extract.h"			/* must come after interface.h */
51 #include "appletalk.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 LLAP packets received on a physical LocalTalk interface.
90  */
91 void
92 ltalk_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
93 {
94 	snapend = p + h->caplen;
95 	++infodelay;
96 	ts_print(&h->ts);
97 	llap_print(p, h->caplen);
98 	if(xflag)
99 		default_print(p, h->caplen);
100 	putchar('\n');
101 	--infodelay;
102 	if (infoprint)
103 		info(0);
104 }
105 
106 /*
107  * Print AppleTalk LLAP packets.
108  */
109 void
110 llap_print(register const u_char *bp, u_int length)
111 {
112 	register const struct LAP *lp;
113 	register const struct atDDP *dp;
114 	register const struct atShortDDP *sdp;
115 	u_short snet;
116 
117 #if 0
118 	lp = (const struct LAP *)bp;
119 	bp += sizeof(*lp);
120 	length -= sizeof(*lp);
121 #else
122 	{
123 		static struct LAP lp_ = {0, 0, lapDDP};
124 		lp = &lp_;
125 	}
126 #endif
127 	switch (lp->type) {
128 
129 	case lapShortDDP:
130 		if (length < ddpSSize) {
131 			(void)printf(" [|sddp %d]", length);
132 			return;
133 		}
134 		sdp = (const struct atShortDDP *)bp;
135 		printf("%s.%s",
136 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
137 		printf(" > %s.%s:",
138 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
139 		bp += ddpSSize;
140 		length -= ddpSSize;
141 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
142 		break;
143 
144 	case lapDDP:
145 		if (length < ddpSize) {
146 			(void)printf(" [|ddp %d]", length);
147 			return;
148 		}
149 		dp = (const struct atDDP *)bp;
150 		snet = EXTRACT_16BITS(&dp->srcNet);
151 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
152 		    ddpskt_string(dp->srcSkt));
153 		printf(" > %s.%s:",
154 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
155 		    ddpskt_string(dp->dstSkt));
156 		bp += ddpSize;
157 		length -= ddpSize;
158 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
159 		break;
160 
161 #ifdef notdef
162 	case lapKLAP:
163 		klap_print(bp, length);
164 		break;
165 #endif
166 
167 	default:
168 		printf("%d > %d at-lap#%d %d",
169 		    lp->src, lp->dst, lp->type, length);
170 		break;
171 	}
172 }
173 
174 /*
175  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
176  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
177  * packets in them).
178  */
179 void
180 atalk_print(register const u_char *bp, u_int length)
181 {
182 	register const struct atDDP *dp;
183 	u_short snet;
184 
185 	if (length < ddpSize) {
186 		(void)printf(" [|ddp %d]", length);
187 		return;
188 	}
189 	dp = (const struct atDDP *)bp;
190 	snet = EXTRACT_16BITS(&dp->srcNet);
191 	printf("%s.%s", ataddr_string(snet, dp->srcNode),
192 	       ddpskt_string(dp->srcSkt));
193 	printf(" > %s.%s:",
194 	       ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
195 	       ddpskt_string(dp->dstSkt));
196 	bp += ddpSize;
197 	length -= ddpSize;
198 #ifdef LBL_ALIGN
199 	if ((long)bp & 3) {
200 		static u_char *abuf = NULL;
201 
202 		if (abuf == NULL) {
203 			abuf = (u_char *)malloc(snaplen);
204 			if (abuf == NULL)
205 				error("atalk_print: malloc");
206 		}
207 		memcpy((char *)abuf, (char *)bp, min(length, snaplen));
208 		snapend += abuf - (u_char *)bp;
209 		packetp = abuf;
210 		bp = abuf;
211 	}
212 #endif
213 	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
214 }
215 
216 /* XXX should probably pass in the snap header and do checks like arp_print() */
217 void
218 aarp_print(register const u_char *bp, u_int length)
219 {
220 	register const struct aarp *ap;
221 
222 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
223 
224 	printf("aarp ");
225 	ap = (const struct aarp *)bp;
226 	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
227 	    ap->halen == 6 && ap->palen == 4 )
228 		switch (ntohs(ap->op)) {
229 
230 		case 1:				/* request */
231 			(void)printf("who-has %s tell %s",
232 			    AT(pdaddr), AT(psaddr));
233 			return;
234 
235 		case 2:				/* response */
236 			(void)printf("reply %s is-at %s",
237 			    AT(psaddr), etheraddr_string(ap->hsaddr));
238 			return;
239 
240 		case 3:				/* probe (oy!) */
241 			(void)printf("probe %s tell %s",
242 			    AT(pdaddr), AT(psaddr));
243 			return;
244 		}
245 	(void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
246 	    length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
247 	    ap->halen, ap->palen);
248 }
249 
250 /*
251  * Print AppleTalk Datagram Delivery Protocol packets.
252  */
253 static void
254 ddp_print(register const u_char *bp, register u_int length, register int t,
255 	  register u_short snet, register u_char snode, u_char skt)
256 {
257 
258 	switch (t) {
259 
260 	case ddpNBP:
261 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
262 		break;
263 
264 	case ddpATP:
265 		atp_print((const struct atATP *)bp, length);
266 		break;
267 
268 	default:
269 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
270 		break;
271 	}
272 }
273 
274 static void
275 atp_print(register const struct atATP *ap, u_int length)
276 {
277 	char c;
278 	u_int32_t data;
279 
280 	if ((const u_char *)(ap + 1) > snapend) {
281 		/* Just bail if we don't have the whole chunk. */
282 		fputs(tstr, stdout);
283 		return;
284 	}
285 	length -= sizeof(*ap);
286 	switch (ap->control & 0xc0) {
287 
288 	case atpReqCode:
289 		(void)printf(" atp-req%s %d",
290 			     ap->control & atpXO? " " : "*",
291 			     EXTRACT_16BITS(&ap->transID));
292 
293 		atp_bitmap_print(ap->bitmap);
294 
295 		if (length != 0)
296 			(void)printf(" [len=%d]", length);
297 
298 		switch (ap->control & (atpEOM|atpSTS)) {
299 		case atpEOM:
300 			(void)printf(" [EOM]");
301 			break;
302 		case atpSTS:
303 			(void)printf(" [STS]");
304 			break;
305 		case atpEOM|atpSTS:
306 			(void)printf(" [EOM,STS]");
307 			break;
308 		}
309 		break;
310 
311 	case atpRspCode:
312 		(void)printf(" atp-resp%s%d:%d (%d)",
313 			     ap->control & atpEOM? "*" : " ",
314 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
315 		switch (ap->control & (atpXO|atpSTS)) {
316 		case atpXO:
317 			(void)printf(" [XO]");
318 			break;
319 		case atpSTS:
320 			(void)printf(" [STS]");
321 			break;
322 		case atpXO|atpSTS:
323 			(void)printf(" [XO,STS]");
324 			break;
325 		}
326 		break;
327 
328 	case atpRelCode:
329 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
330 
331 		atp_bitmap_print(ap->bitmap);
332 
333 		/* length should be zero */
334 		if (length)
335 			(void)printf(" [len=%d]", length);
336 
337 		/* there shouldn't be any control flags */
338 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
339 			c = '[';
340 			if (ap->control & atpXO) {
341 				(void)printf("%cXO", c);
342 				c = ',';
343 			}
344 			if (ap->control & atpEOM) {
345 				(void)printf("%cEOM", c);
346 				c = ',';
347 			}
348 			if (ap->control & atpSTS) {
349 				(void)printf("%cSTS", c);
350 				c = ',';
351 			}
352 			(void)printf("]");
353 		}
354 		break;
355 
356 	default:
357 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
358 			     EXTRACT_16BITS(&ap->transID), length);
359 		break;
360 	}
361 	data = EXTRACT_32BITS(&ap->userData);
362 	if (data != 0)
363 		(void)printf(" 0x%x", data);
364 }
365 
366 static void
367 atp_bitmap_print(register u_char bm)
368 {
369 	register char c;
370 	register int i;
371 
372 	/*
373 	 * The '& 0xff' below is needed for compilers that want to sign
374 	 * extend a u_char, which is the case with the Ultrix compiler.
375 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
376 	 */
377 	if ((bm + 1) & (bm & 0xff)) {
378 		c = '<';
379 		for (i = 0; bm; ++i) {
380 			if (bm & 1) {
381 				(void)printf("%c%d", c, i);
382 				c = ',';
383 			}
384 			bm >>= 1;
385 		}
386 		(void)printf(">");
387 	} else {
388 		for (i = 0; bm; ++i)
389 			bm >>= 1;
390 		if (i > 1)
391 			(void)printf("<0-%d>", i - 1);
392 		else
393 			(void)printf("<0>");
394 	}
395 }
396 
397 static void
398 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
399 	  register u_char snode, register u_char skt)
400 {
401 	register const struct atNBPtuple *tp =
402 		(const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
403 	int i;
404 	const u_char *ep;
405 
406 	length -= nbpHeaderSize;
407 	if (length < 8) {
408 		/* must be room for at least one tuple */
409 		(void)printf(" truncated-nbp %d", length + nbpHeaderSize);
410 		return;
411 	}
412 	/* ep points to end of available data */
413 	ep = snapend;
414 	if ((const u_char *)tp > ep) {
415 		fputs(tstr, stdout);
416 		return;
417 	}
418 	switch (i = np->control & 0xf0) {
419 
420 	case nbpBrRq:
421 	case nbpLkUp:
422 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
423 			     np->id);
424 		if ((const u_char *)(tp + 1) > ep) {
425 			fputs(tstr, stdout);
426 			return;
427 		}
428 		(void)nbp_name_print(tp, ep);
429 		/*
430 		 * look for anomalies: the spec says there can only
431 		 * be one tuple, the address must match the source
432 		 * address and the enumerator should be zero.
433 		 */
434 		if ((np->control & 0xf) != 1)
435 			(void)printf(" [ntup=%d]", np->control & 0xf);
436 		if (tp->enumerator)
437 			(void)printf(" [enum=%d]", tp->enumerator);
438 		if (EXTRACT_16BITS(&tp->net) != snet ||
439 		    tp->node != snode || tp->skt != skt)
440 			(void)printf(" [addr=%s.%d]",
441 			    ataddr_string(EXTRACT_16BITS(&tp->net),
442 			    tp->node), tp->skt);
443 		break;
444 
445 	case nbpLkUpReply:
446 		(void)printf(" nbp-reply %d:", np->id);
447 
448 		/* print each of the tuples in the reply */
449 		for (i = np->control & 0xf; --i >= 0 && tp; )
450 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
451 		break;
452 
453 	default:
454 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
455 				length);
456 		break;
457 	}
458 }
459 
460 /* print a counted string */
461 static const char *
462 print_cstring(register const char *cp, register const u_char *ep)
463 {
464 	register u_int length;
465 
466 	if (cp >= (const char *)ep) {
467 		fputs(tstr, stdout);
468 		return (0);
469 	}
470 	length = *cp++;
471 
472 	/* Spec says string can be at most 32 bytes long */
473 	if (length > 32) {
474 		(void)printf("[len=%u]", length);
475 		return (0);
476 	}
477 	while ((int)--length >= 0) {
478 		if (cp >= (const char *)ep) {
479 			fputs(tstr, stdout);
480 			return (0);
481 		}
482 		putchar(*cp++);
483 	}
484 	return (cp);
485 }
486 
487 static const struct atNBPtuple *
488 nbp_tuple_print(register const struct atNBPtuple *tp,
489 		register const u_char *ep,
490 		register u_short snet, register u_char snode,
491 		register u_char skt)
492 {
493 	register const struct atNBPtuple *tpn;
494 
495 	if ((const u_char *)(tp + 1) > ep) {
496 		fputs(tstr, stdout);
497 		return 0;
498 	}
499 	tpn = nbp_name_print(tp, ep);
500 
501 	/* if the enumerator isn't 1, print it */
502 	if (tp->enumerator != 1)
503 		(void)printf("(%d)", tp->enumerator);
504 
505 	/* if the socket doesn't match the src socket, print it */
506 	if (tp->skt != skt)
507 		(void)printf(" %d", tp->skt);
508 
509 	/* if the address doesn't match the src address, it's an anomaly */
510 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
511 		(void)printf(" [addr=%s]",
512 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
513 
514 	return (tpn);
515 }
516 
517 static const struct atNBPtuple *
518 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
519 {
520 	register const char *cp = (const char *)tp + nbpTupleSize;
521 
522 	putchar(' ');
523 
524 	/* Object */
525 	putchar('"');
526 	if ((cp = print_cstring(cp, ep)) != NULL) {
527 		/* Type */
528 		putchar(':');
529 		if ((cp = print_cstring(cp, ep)) != NULL) {
530 			/* Zone */
531 			putchar('@');
532 			if ((cp = print_cstring(cp, ep)) != NULL)
533 				putchar('"');
534 		}
535 	}
536 	return ((const struct atNBPtuple *)cp);
537 }
538 
539 
540 #define HASHNAMESIZE 4096
541 
542 struct hnamemem {
543 	int addr;
544 	char *name;
545 	struct hnamemem *nxt;
546 };
547 
548 static struct hnamemem hnametable[HASHNAMESIZE];
549 
550 static const char *
551 ataddr_string(u_short atnet, u_char athost)
552 {
553 	register struct hnamemem *tp, *tp2;
554 	register int i = (atnet << 8) | athost;
555 	char nambuf[MAXHOSTNAMELEN + 20];
556 	static int first = 1;
557 	FILE *fp;
558 
559 	/*
560 	 * if this is the first call, see if there's an AppleTalk
561 	 * number to name map file.
562 	 */
563 	if (first && (first = 0, !nflag)
564 	    && (fp = fopen("/etc/atalk.names", "r"))) {
565 		char line[256];
566 		int i1, i2, i3;
567 
568 		while (fgets(line, sizeof(line), fp)) {
569 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
570 				continue;
571 			if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
572 				     nambuf) == 4)
573 				/* got a hostname. */
574 				i3 |= ((i1 << 8) | i2) << 8;
575 			else if (sscanf(line, "%d.%d %256s", &i1, &i2,
576 					nambuf) == 3)
577 				/* got a net name */
578 				i3 = (((i1 << 8) | i2) << 8) | 255;
579 			else
580 				continue;
581 
582 			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
583 			     tp->nxt; tp = tp->nxt)
584 				;
585 			tp->addr = i2;
586 			tp->nxt = newhnamemem();
587 			tp->name = strdup(nambuf);
588 		}
589 		fclose(fp);
590 	}
591 
592 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
593 		if (tp->addr == i)
594 			return (tp->name);
595 
596 	/* didn't have the node name -- see if we've got the net name */
597 	i |= 255;
598 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
599 		if (tp2->addr == i) {
600 			tp->addr = (atnet << 8) | athost;
601 			tp->nxt = newhnamemem();
602 			(void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
603 			    tp2->name, athost);
604 			tp->name = strdup(nambuf);
605 			return (tp->name);
606 		}
607 
608 	tp->addr = (atnet << 8) | athost;
609 	tp->nxt = newhnamemem();
610 	if (athost != 255)
611 		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
612 		    atnet >> 8, atnet & 0xff, athost);
613 	else
614 		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
615 		    atnet & 0xff);
616 	tp->name = strdup(nambuf);
617 
618 	return (tp->name);
619 }
620 
621 static struct tok skt2str[] = {
622 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
623 	{ nbpSkt,	"nis" },	/* name info socket */
624 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
625 	{ zipSkt,	"zip" },	/* zone info protocol */
626 	{ 0,		NULL }
627 };
628 
629 static const char *
630 ddpskt_string(register int skt)
631 {
632 	static char buf[8];
633 
634 	if (nflag) {
635 		(void)snprintf(buf, sizeof(buf), "%d", skt);
636 		return (buf);
637 	}
638 	return (tok2str(skt2str, "%d", skt));
639 }
640