xref: /openbsd/usr.sbin/tcpdump/print-atalk.c (revision 404b540a) 
1 /*	$OpenBSD: print-atalk.c,v 1.25 2007/10/07 16:41:05 deraadt Exp $	*/
2 
3 /*
4  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
5  *	The Regents of the University of California.  All rights reserved.
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that: (1) source code distributions
9  * retain the above copyright notice and this paragraph in its entirety, (2)
10  * distributions including binary code include the above copyright notice and
11  * this paragraph in its entirety in the documentation or other materials
12  * provided with the distribution, and (3) all advertising materials mentioning
13  * features or use of this software display the following acknowledgement:
14  * ``This product includes software developed by the University of California,
15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
16  * the University nor the names of its contributors may be used to endorse
17  * or promote products derived from this software without specific prior
18  * written permission.
19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
22  *
23  * Format and print AppleTalk packets.
24  */
25 
26 #ifndef lint
27 static const char rcsid[] =
28     "@(#) $Id: print-atalk.c,v 1.25 2007/10/07 16:41:05 deraadt Exp $ (LBL)";
29 #endif
30 
31 #include <sys/param.h>
32 #include <sys/time.h>
33 #include <sys/socket.h>
34 
35 struct mbuf;
36 struct rtentry;
37 #include <net/if.h>
38 
39 #include <netinet/in.h>
40 #include <netinet/in_systm.h>
41 #include <netinet/ip.h>
42 #include <netinet/ip_var.h>
43 #include <netinet/if_ether.h>
44 #include <netinet/udp.h>
45 #include <netinet/udp_var.h>
46 #include <netinet/tcp.h>
47 #include <netinet/tcpip.h>
48 
49 #include <inttypes.h>
50 #include <stdio.h>
51 #include <stdlib.h>
52 #include <string.h>
53 
54 #include "interface.h"
55 #include "addrtoname.h"
56 #include "ethertype.h"
57 #include "extract.h"			/* must come after interface.h */
58 #include "appletalk.h"
59 #include "savestr.h"
60 #include "privsep.h"
61 
62 static struct tok type2str[] = {
63 	{ ddpRTMP,		"rtmp" },
64 	{ ddpRTMPrequest,	"rtmpReq" },
65 	{ ddpECHO,		"echo" },
66 	{ ddpIP,		"IP" },
67 	{ ddpARP,		"ARP" },
68 	{ ddpKLAP,		"KLAP" },
69 	{ 0,			NULL }
70 };
71 
72 struct aarp {
73 	u_int16_t	htype, ptype;
74 	u_int8_t	halen, palen;
75 	u_int16_t	op;
76 	u_int8_t	hsaddr[6];
77 	u_int8_t	psaddr[4];
78 	u_int8_t	hdaddr[6];
79 	u_int8_t	pdaddr[4];
80 };
81 
82 static char tstr[] = "[|atalk]";
83 
84 static void atp_print(const struct atATP *, u_int);
85 static void atp_bitmap_print(u_char);
86 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
87 static const char *print_cstring(const char *, const u_char *);
88 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
89 						const u_char *,
90 						u_short, u_char, u_char);
91 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
92 					       const u_char *);
93 static const char *ataddr_string(u_short, u_char);
94 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
95 static const char *ddpskt_string(int);
96 
97 /*
98  * Print AppleTalk Datagram Delivery Protocol packets
99  * without the LLAP encapsulating header (i.e.
100  * from Ethertalk)
101  */
102 void
103 atalk_print(register const u_char *bp, u_int length)
104 {
105 	register const struct atDDP *dp;
106 	u_short snet;
107 
108 	if (length < ddpSize) {
109 		(void)printf(" [|ddp %d]", length);
110 		return;
111 	}
112 	dp = (const struct atDDP *)bp;
113 	snet = EXTRACT_16BITS(&dp->srcNet);
114 	printf("%s.%s", ataddr_string(snet, dp->srcNode),
115 	    ddpskt_string(dp->srcSkt));
116 	printf(" > %s.%s:",
117 	    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
118 	    ddpskt_string(dp->dstSkt));
119 	bp += ddpSize;
120 	length -= ddpSize;
121 	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
122 }
123 
124 /*
125  * Print AppleTalk Datagram Delivery Protocol packets
126  * from localtalk (i.e. the 230 Kbps net built into
127  * every Macintosh). We can get these from a localtalk
128  * interface if we have one, or from UDP encapsulated tunnels.
129  */
130 void
131 atalk_print_llap(register const u_char *bp, u_int length)
132 {
133 	register const struct LAP *lp;
134 	register const struct atDDP *dp;
135 	register const struct atShortDDP *sdp;
136 	u_short snet;
137 
138 	lp = (struct LAP *)bp;
139 	bp += sizeof(*lp);
140 	length -= sizeof(*lp);
141 	switch (lp->type) {
142 
143 	case lapShortDDP:
144 		if (length < ddpSSize) {
145 			(void)printf(" [|sddp %d]", length);
146 			return;
147 		}
148 		sdp = (const struct atShortDDP *)bp;
149 		printf("%s.%s",
150 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
151 		printf(" > %s.%s:",
152 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
153 		bp += ddpSSize;
154 		length -= ddpSSize;
155 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
156 		break;
157 
158 	case lapDDP:
159 		if (length < ddpSize) {
160 			(void)printf(" [|ddp %d]", length);
161 			return;
162 		}
163 		dp = (const struct atDDP *)bp;
164 		snet = EXTRACT_16BITS(&dp->srcNet);
165 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
166 		    ddpskt_string(dp->srcSkt));
167 		printf(" > %s.%s:",
168 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
169 		    ddpskt_string(dp->dstSkt));
170 		bp += ddpSize;
171 		length -= ddpSize;
172 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
173 		break;
174 
175 #ifdef notdef
176 	case lapKLAP:
177 		klap_print(bp, length);
178 		break;
179 #endif
180 
181 	default:
182 		printf("%d > %d at-lap#%d %d",
183 		    lp->src, lp->dst, lp->type, length);
184 		break;
185 	}
186 }
187 
188 /* XXX should probably pass in the snap header and do checks like arp_print() */
189 void
190 aarp_print(register const u_char *bp, u_int length)
191 {
192 	register const struct aarp *ap;
193 
194 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
195 
196 	printf("aarp ");
197 	ap = (const struct aarp *)bp;
198 	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
199 	    ap->halen == 6 && ap->palen == 4 )
200 		switch (ntohs(ap->op)) {
201 
202 		case 1:				/* request */
203 			(void)printf("who-has %s tell %s",
204 			    AT(pdaddr), AT(psaddr));
205 			return;
206 
207 		case 2:				/* response */
208 			(void)printf("reply %s is-at %s",
209 			    AT(pdaddr), etheraddr_string(ap->hdaddr));
210 			return;
211 
212 		case 3:				/* probe (oy!) */
213 			(void)printf("probe %s tell %s",
214 			    AT(pdaddr), AT(psaddr));
215 			return;
216 		}
217 	(void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
218 	    length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
219 	    ap->halen, ap->palen);
220 }
221 
222 static void
223 ddp_print(register const u_char *bp, register u_int length, register int t,
224 	  register u_short snet, register u_char snode, u_char skt)
225 {
226 
227 	if ((intptr_t)bp & (sizeof(long)-1)) {
228 		static u_char *abuf = NULL;
229 		int clen = snapend - bp;
230 		if (clen > snaplen)
231 			clen = snaplen;
232 
233 		if (abuf == NULL) {
234 			abuf = (u_char *)malloc(snaplen);
235 			if (abuf == NULL)
236 				error("ddp_print: malloc");
237 		}
238 		memmove((char *)abuf, (char *)bp, min(length, clen));
239 		snapend = abuf + clen;
240 		packetp = abuf;
241 		bp = abuf;
242 	}
243 
244 	switch (t) {
245 
246 	case ddpNBP:
247 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
248 		break;
249 
250 	case ddpATP:
251 		atp_print((const struct atATP *)bp, length);
252 		break;
253 
254 	default:
255 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
256 		break;
257 	}
258 }
259 
260 static void
261 atp_print(register const struct atATP *ap, u_int length)
262 {
263 	char c;
264 	u_int32_t data;
265 
266 	if ((const u_char *)(ap + 1) > snapend) {
267 		/* Just bail if we don't have the whole chunk. */
268 		fputs(tstr, stdout);
269 		return;
270 	}
271 	length -= sizeof(*ap);
272 	switch (ap->control & 0xc0) {
273 
274 	case atpReqCode:
275 		(void)printf(" atp-req%s %d",
276 			     ap->control & atpXO? " " : "*",
277 			     EXTRACT_16BITS(&ap->transID));
278 
279 		atp_bitmap_print(ap->bitmap);
280 
281 		if (length != 0)
282 			(void)printf(" [len=%d]", length);
283 
284 		switch (ap->control & (atpEOM|atpSTS)) {
285 		case atpEOM:
286 			(void)printf(" [EOM]");
287 			break;
288 		case atpSTS:
289 			(void)printf(" [STS]");
290 			break;
291 		case atpEOM|atpSTS:
292 			(void)printf(" [EOM,STS]");
293 			break;
294 		}
295 		break;
296 
297 	case atpRspCode:
298 		(void)printf(" atp-resp%s%d:%d (%d)",
299 			     ap->control & atpEOM? "*" : " ",
300 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
301 		switch (ap->control & (atpXO|atpSTS)) {
302 		case atpXO:
303 			(void)printf(" [XO]");
304 			break;
305 		case atpSTS:
306 			(void)printf(" [STS]");
307 			break;
308 		case atpXO|atpSTS:
309 			(void)printf(" [XO,STS]");
310 			break;
311 		}
312 		break;
313 
314 	case atpRelCode:
315 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
316 
317 		atp_bitmap_print(ap->bitmap);
318 
319 		/* length should be zero */
320 		if (length)
321 			(void)printf(" [len=%d]", length);
322 
323 		/* there shouldn't be any control flags */
324 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
325 			c = '[';
326 			if (ap->control & atpXO) {
327 				(void)printf("%cXO", c);
328 				c = ',';
329 			}
330 			if (ap->control & atpEOM) {
331 				(void)printf("%cEOM", c);
332 				c = ',';
333 			}
334 			if (ap->control & atpSTS) {
335 				(void)printf("%cSTS", c);
336 				c = ',';
337 			}
338 			(void)printf("]");
339 		}
340 		break;
341 
342 	default:
343 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
344 			     EXTRACT_16BITS(&ap->transID), length);
345 		break;
346 	}
347 	data = EXTRACT_32BITS(&ap->userData);
348 	if (data != 0)
349 		(void)printf(" 0x%x", data);
350 }
351 
352 static void
353 atp_bitmap_print(register u_char bm)
354 {
355 	register char c;
356 	register int i;
357 
358 	/*
359 	 * The '& 0xff' below is needed for compilers that want to sign
360 	 * extend a u_char, which is the case with the Ultrix compiler.
361 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
362 	 */
363 	if ((bm + 1) & (bm & 0xff)) {
364 		c = '<';
365 		for (i = 0; bm; ++i) {
366 			if (bm & 1) {
367 				(void)printf("%c%d", c, i);
368 				c = ',';
369 			}
370 			bm >>= 1;
371 		}
372 		(void)printf(">");
373 	} else {
374 		for (i = 0; bm; ++i)
375 			bm >>= 1;
376 		if (i > 1)
377 			(void)printf("<0-%d>", i - 1);
378 		else
379 			(void)printf("<0>");
380 	}
381 }
382 
383 static void
384 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
385 	  register u_char snode, register u_char skt)
386 {
387 	register const struct atNBPtuple *tp =
388 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
389 	int i;
390 	const u_char *ep;
391 
392 	if (length < nbpHeaderSize) {
393 		(void)printf(" truncated-nbp %d", length);
394 		return;
395 	}
396 
397 	length -= nbpHeaderSize;
398 	if (length < 8) {
399 		/* must be room for at least one tuple */
400 		if (np->control == nbpNATLKerr) {
401 			(void)printf(" nbp-netatalk_err");
402 			return;
403 		} else if (np->control == nbpNATLKok) {
404 			(void)printf(" nbp-netatalk_ok");
405 			return;
406 		}
407 		(void)printf(" truncated-nbp nbp-0x%x  %d (%d)",
408 			np->control, np->id, length + nbpHeaderSize);
409 		return;
410 	}
411 	/* ep points to end of available data */
412 	ep = snapend;
413 	if ((const u_char *)tp > ep) {
414 		fputs(tstr, stdout);
415 		return;
416 	}
417 	switch (i = np->control & 0xf0) {
418 
419 	case nbpBrRq:
420 	case nbpLkUp:
421 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
422 			     np->id);
423 		if ((const u_char *)(tp + 1) > ep) {
424 			fputs(tstr, stdout);
425 			return;
426 		}
427 		(void)nbp_name_print(tp, ep);
428 		/*
429 		 * look for anomalies: the spec says there can only
430 		 * be one tuple, the address must match the source
431 		 * address and the enumerator should be zero.
432 		 */
433 		if ((np->control & 0xf) != 1)
434 			(void)printf(" [ntup=%d]", np->control & 0xf);
435 		if (tp->enumerator)
436 			(void)printf(" [enum=%d]", tp->enumerator);
437 		if (EXTRACT_16BITS(&tp->net) != snet ||
438 		    tp->node != snode || tp->skt != skt)
439 			(void)printf(" [addr=%s.%d]",
440 			    ataddr_string(EXTRACT_16BITS(&tp->net),
441 			    tp->node), tp->skt);
442 		break;
443 
444 	case nbpLkUpReply:
445 		(void)printf(" nbp-reply %d:", np->id);
446 
447 		/* print each of the tuples in the reply */
448 		for (i = np->control & 0xf; --i >= 0 && tp; )
449 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
450 		break;
451 
452 	case nbpNATLKrgstr:
453 	case nbpNATLKunrgstr:
454 		(void)printf((i == nbpNATLKrgstr) ?
455 			" nbp-netatalk_rgstr %d:" :
456 			" nbp-netatalk_unrgstr %d:",
457 			np->id);
458 		for (i = np->control & 0xf; --i >= 0 && tp; )
459 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
460 		break;
461 
462 	default:
463 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
464 				length);
465 		break;
466 	}
467 }
468 
469 /* print a counted string */
470 static const char *
471 print_cstring(register const char *cp, register const u_char *ep)
472 {
473 	register u_int length;
474 
475 	if (cp >= (const char *)ep) {
476 		fputs(tstr, stdout);
477 		return (0);
478 	}
479 	length = *cp++;
480 
481 	/* Spec says string can be at most 32 bytes long */
482 	if (length < 0 || length > 32) {
483 		(void)printf("[len=%d]", length);
484 		return (0);
485 	}
486 	while ((int)--length >= 0) {
487 		if (cp >= (char *)ep) {
488 			fputs(tstr, stdout);
489 			return (0);
490 		}
491 		putchar(*cp++);
492 	}
493 	return (cp);
494 }
495 
496 static const struct atNBPtuple *
497 nbp_tuple_print(register const struct atNBPtuple *tp,
498 		register const u_char *ep,
499 		register u_short snet, register u_char snode,
500 		register u_char skt)
501 {
502 	register const struct atNBPtuple *tpn;
503 
504 	if ((const u_char *)(tp + 1) > ep) {
505 		fputs(tstr, stdout);
506 		return 0;
507 	}
508 	tpn = nbp_name_print(tp, ep);
509 
510 	/* if the enumerator isn't 1, print it */
511 	if (tp->enumerator != 1)
512 		(void)printf("(%d)", tp->enumerator);
513 
514 	/* if the socket doesn't match the src socket, print it */
515 	if (tp->skt != skt)
516 		(void)printf(" %d", tp->skt);
517 
518 	/* if the address doesn't match the src address, it's an anomaly */
519 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
520 		(void)printf(" [addr=%s]",
521 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
522 
523 	return (tpn);
524 }
525 
526 static const struct atNBPtuple *
527 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
528 {
529 	register const char *cp = (const char *)tp + nbpTupleSize;
530 
531 	putchar(' ');
532 
533 	/* Object */
534 	putchar('"');
535 	if ((cp = print_cstring(cp, ep)) != NULL) {
536 		/* Type */
537 		putchar(':');
538 		if ((cp = print_cstring(cp, ep)) != NULL) {
539 			/* Zone */
540 			putchar('@');
541 			if ((cp = print_cstring(cp, ep)) != NULL)
542 				putchar('"');
543 		}
544 	}
545 	return ((const struct atNBPtuple *)cp);
546 }
547 
548 
549 #define HASHNAMESIZE 4096
550 
551 struct hnamemem {
552 	int addr;
553 	char *name;
554 	struct hnamemem *nxt;
555 };
556 
557 static struct hnamemem hnametable[HASHNAMESIZE];
558 
559 /*
560  * see if there's an AppleTalk number to name map file.
561  */
562 static void
563 init_atalk(void)
564 {
565 	struct hnamemem *tp;
566 	char nambuf[MAXHOSTNAMELEN + 20];
567 	char line[BUFSIZ];
568 	int i1, i2, i3;
569 
570 	priv_getlines(FTAB_APPLETALK);
571 	while (priv_getline(line, sizeof(line)) > 0) {
572 		if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
573 			continue;
574 		if (sscanf(line, "%d.%d.%d %255s", &i1, &i2, &i3, nambuf) == 4)
575 			/* got a hostname. */
576 			i3 |= ((i1 << 8) | i2) << 8;
577 		else if (sscanf(line, "%d.%d %255s", &i1, &i2, nambuf) == 3)
578 			/* got a net name */
579 			i3 = (((i1 << 8) | i2) << 8) | 255;
580 		else
581 			continue;
582 
583 		for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
584 		     tp->nxt; tp = tp->nxt)
585 			;
586 		tp->addr = i3;
587 		tp->nxt = newhnamemem();
588 		tp->name = savestr(nambuf);
589 	}
590 }
591 
592 static const char *
593 ataddr_string(u_short atnet, u_char athost)
594 {
595 	register struct hnamemem *tp, *tp2;
596 	register int i = (atnet << 8) | athost;
597 	char nambuf[MAXHOSTNAMELEN + 20];
598 	static int first = 1;
599 
600 	if (first) {
601 		first = 0;
602 		init_atalk();
603 	}
604 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
605 		if (tp->addr == i)
606 			return (tp->name);
607 
608 	/* didn't have the node name -- see if we've got the net name */
609 	i |= 255;
610 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
611 		if (tp2->addr == i) {
612 			tp->addr = (atnet << 8) | athost;
613 			tp->nxt = newhnamemem();
614 			(void)snprintf(nambuf, sizeof nambuf, "%s.%d",
615 			    tp2->name, athost);
616 			tp->name = savestr(nambuf);
617 			return (tp->name);
618 		}
619 
620 	tp->addr = (atnet << 8) | athost;
621 	tp->nxt = newhnamemem();
622 	if (athost != 255)
623 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d.%d",
624 			atnet >> 8, atnet & 0xff, athost);
625 	else
626 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d",
627 			atnet >> 8, atnet & 0xff);
628 	tp->name = savestr(nambuf);
629 
630 	return (tp->name);
631 }
632 
633 static struct tok skt2str[] = {
634 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
635 	{ nbpSkt,	"nis" },	/* name info socket */
636 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
637 	{ zipSkt,	"zip" },	/* zone info protocol */
638 	{ 0,		NULL }
639 };
640 
641 static const char *
642 ddpskt_string(register int skt)
643 {
644 	static char buf[12];
645 
646 	if (nflag) {
647 		(void)snprintf(buf, sizeof buf, "%d", skt);
648 		return (buf);
649 	}
650 	return (tok2str(skt2str, "%d", skt));
651 }
652