xref: /openbsd/usr.sbin/tcpdump/print-atalk.c (revision 323ce4b6) 
1 /*	$OpenBSD: print-atalk.c,v 1.29 2015/08/21 02:07:32 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 #include <sys/time.h>
27 #include <sys/socket.h>
28 
29 struct mbuf;
30 struct rtentry;
31 #include <net/if.h>
32 
33 #include <netinet/in.h>
34 #include <netinet/ip.h>
35 #include <netinet/ip_var.h>
36 #include <netinet/if_ether.h>
37 #include <netinet/udp.h>
38 #include <netinet/udp_var.h>
39 #include <netinet/tcp.h>
40 
41 #include <inttypes.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45 #include <limits.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 #include "savestr.h"
53 #include "privsep.h"
54 
55 static struct tok type2str[] = {
56 	{ ddpRTMP,		"rtmp" },
57 	{ ddpRTMPrequest,	"rtmpReq" },
58 	{ ddpECHO,		"echo" },
59 	{ ddpIP,		"IP" },
60 	{ ddpARP,		"ARP" },
61 	{ ddpKLAP,		"KLAP" },
62 	{ 0,			NULL }
63 };
64 
65 struct aarp {
66 	u_int16_t	htype, ptype;
67 	u_int8_t	halen, palen;
68 	u_int16_t	op;
69 	u_int8_t	hsaddr[6];
70 	u_int8_t	psaddr[4];
71 	u_int8_t	hdaddr[6];
72 	u_int8_t	pdaddr[4];
73 };
74 
75 static char tstr[] = "[|atalk]";
76 
77 static void atp_print(const struct atATP *, u_int);
78 static void atp_bitmap_print(u_char);
79 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
80 static const char *print_cstring(const char *, const u_char *);
81 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
82 						const u_char *,
83 						u_short, u_char, u_char);
84 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
85 					       const u_char *);
86 static const char *ataddr_string(u_short, u_char);
87 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
88 static const char *ddpskt_string(int);
89 
90 /*
91  * Print AppleTalk Datagram Delivery Protocol packets
92  * without the LLAP encapsulating header (i.e.
93  * from Ethertalk)
94  */
95 void
96 atalk_print(register const u_char *bp, u_int length)
97 {
98 	register const struct atDDP *dp;
99 	u_short snet;
100 
101 	if (length < ddpSize) {
102 		(void)printf(" [|ddp %d]", length);
103 		return;
104 	}
105 	dp = (const struct atDDP *)bp;
106 	snet = EXTRACT_16BITS(&dp->srcNet);
107 	printf("%s.%s", ataddr_string(snet, dp->srcNode),
108 	    ddpskt_string(dp->srcSkt));
109 	printf(" > %s.%s:",
110 	    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
111 	    ddpskt_string(dp->dstSkt));
112 	bp += ddpSize;
113 	length -= ddpSize;
114 	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
115 }
116 
117 /*
118  * Print AppleTalk Datagram Delivery Protocol packets
119  * from localtalk (i.e. the 230 Kbps net built into
120  * every Macintosh). We can get these from a localtalk
121  * interface if we have one, or from UDP encapsulated tunnels.
122  */
123 void
124 atalk_print_llap(register const u_char *bp, u_int length)
125 {
126 	register const struct LAP *lp;
127 	register const struct atDDP *dp;
128 	register const struct atShortDDP *sdp;
129 	u_short snet;
130 
131 	lp = (struct LAP *)bp;
132 	bp += sizeof(*lp);
133 	length -= sizeof(*lp);
134 	switch (lp->type) {
135 
136 	case lapShortDDP:
137 		if (length < ddpSSize) {
138 			(void)printf(" [|sddp %d]", length);
139 			return;
140 		}
141 		sdp = (const struct atShortDDP *)bp;
142 		printf("%s.%s",
143 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
144 		printf(" > %s.%s:",
145 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
146 		bp += ddpSSize;
147 		length -= ddpSSize;
148 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
149 		break;
150 
151 	case lapDDP:
152 		if (length < ddpSize) {
153 			(void)printf(" [|ddp %d]", length);
154 			return;
155 		}
156 		dp = (const struct atDDP *)bp;
157 		snet = EXTRACT_16BITS(&dp->srcNet);
158 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
159 		    ddpskt_string(dp->srcSkt));
160 		printf(" > %s.%s:",
161 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
162 		    ddpskt_string(dp->dstSkt));
163 		bp += ddpSize;
164 		length -= ddpSize;
165 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
166 		break;
167 
168 #ifdef notdef
169 	case lapKLAP:
170 		klap_print(bp, length);
171 		break;
172 #endif
173 
174 	default:
175 		printf("%d > %d at-lap#%d %d",
176 		    lp->src, lp->dst, lp->type, length);
177 		break;
178 	}
179 }
180 
181 /* XXX should probably pass in the snap header and do checks like arp_print() */
182 void
183 aarp_print(register const u_char *bp, u_int length)
184 {
185 	register const struct aarp *ap;
186 
187 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
188 
189 	printf("aarp ");
190 	ap = (const struct aarp *)bp;
191 	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
192 	    ap->halen == 6 && ap->palen == 4 )
193 		switch (ntohs(ap->op)) {
194 
195 		case 1:				/* request */
196 			(void)printf("who-has %s tell %s",
197 			    AT(pdaddr), AT(psaddr));
198 			return;
199 
200 		case 2:				/* response */
201 			(void)printf("reply %s is-at %s",
202 			    AT(pdaddr), etheraddr_string(ap->hdaddr));
203 			return;
204 
205 		case 3:				/* probe (oy!) */
206 			(void)printf("probe %s tell %s",
207 			    AT(pdaddr), AT(psaddr));
208 			return;
209 		}
210 	(void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
211 	    length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
212 	    ap->halen, ap->palen);
213 }
214 
215 static void
216 ddp_print(register const u_char *bp, register u_int length, register int t,
217 	  register u_short snet, register u_char snode, u_char skt)
218 {
219 
220 	if ((intptr_t)bp & (sizeof(long)-1)) {
221 		static u_char *abuf = NULL;
222 		int clen = snapend - bp;
223 		if (clen > snaplen)
224 			clen = snaplen;
225 
226 		if (abuf == NULL) {
227 			abuf = malloc(snaplen);
228 			if (abuf == NULL)
229 				error("ddp_print: malloc");
230 		}
231 		memmove((char *)abuf, (char *)bp, min(length, clen));
232 		snapend = abuf + clen;
233 		packetp = abuf;
234 		bp = abuf;
235 	}
236 
237 	switch (t) {
238 
239 	case ddpNBP:
240 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
241 		break;
242 
243 	case ddpATP:
244 		atp_print((const struct atATP *)bp, length);
245 		break;
246 
247 	default:
248 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
249 		break;
250 	}
251 }
252 
253 static void
254 atp_print(register const struct atATP *ap, u_int length)
255 {
256 	char c;
257 	u_int32_t data;
258 
259 	if ((const u_char *)(ap + 1) > snapend) {
260 		/* Just bail if we don't have the whole chunk. */
261 		fputs(tstr, stdout);
262 		return;
263 	}
264 	length -= sizeof(*ap);
265 	switch (ap->control & 0xc0) {
266 
267 	case atpReqCode:
268 		(void)printf(" atp-req%s %d",
269 			     ap->control & atpXO? " " : "*",
270 			     EXTRACT_16BITS(&ap->transID));
271 
272 		atp_bitmap_print(ap->bitmap);
273 
274 		if (length != 0)
275 			(void)printf(" [len=%d]", length);
276 
277 		switch (ap->control & (atpEOM|atpSTS)) {
278 		case atpEOM:
279 			(void)printf(" [EOM]");
280 			break;
281 		case atpSTS:
282 			(void)printf(" [STS]");
283 			break;
284 		case atpEOM|atpSTS:
285 			(void)printf(" [EOM,STS]");
286 			break;
287 		}
288 		break;
289 
290 	case atpRspCode:
291 		(void)printf(" atp-resp%s%d:%d (%d)",
292 			     ap->control & atpEOM? "*" : " ",
293 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
294 		switch (ap->control & (atpXO|atpSTS)) {
295 		case atpXO:
296 			(void)printf(" [XO]");
297 			break;
298 		case atpSTS:
299 			(void)printf(" [STS]");
300 			break;
301 		case atpXO|atpSTS:
302 			(void)printf(" [XO,STS]");
303 			break;
304 		}
305 		break;
306 
307 	case atpRelCode:
308 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
309 
310 		atp_bitmap_print(ap->bitmap);
311 
312 		/* length should be zero */
313 		if (length)
314 			(void)printf(" [len=%d]", length);
315 
316 		/* there shouldn't be any control flags */
317 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
318 			c = '[';
319 			if (ap->control & atpXO) {
320 				(void)printf("%cXO", c);
321 				c = ',';
322 			}
323 			if (ap->control & atpEOM) {
324 				(void)printf("%cEOM", c);
325 				c = ',';
326 			}
327 			if (ap->control & atpSTS) {
328 				(void)printf("%cSTS", c);
329 				c = ',';
330 			}
331 			(void)printf("]");
332 		}
333 		break;
334 
335 	default:
336 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
337 			     EXTRACT_16BITS(&ap->transID), length);
338 		break;
339 	}
340 	data = EXTRACT_32BITS(&ap->userData);
341 	if (data != 0)
342 		(void)printf(" 0x%x", data);
343 }
344 
345 static void
346 atp_bitmap_print(register u_char bm)
347 {
348 	register char c;
349 	register int i;
350 
351 	/*
352 	 * The '& 0xff' below is needed for compilers that want to sign
353 	 * extend a u_char, which is the case with the Ultrix compiler.
354 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
355 	 */
356 	if ((bm + 1) & (bm & 0xff)) {
357 		c = '<';
358 		for (i = 0; bm; ++i) {
359 			if (bm & 1) {
360 				(void)printf("%c%d", c, i);
361 				c = ',';
362 			}
363 			bm >>= 1;
364 		}
365 		(void)printf(">");
366 	} else {
367 		for (i = 0; bm; ++i)
368 			bm >>= 1;
369 		if (i > 1)
370 			(void)printf("<0-%d>", i - 1);
371 		else
372 			(void)printf("<0>");
373 	}
374 }
375 
376 static void
377 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
378 	  register u_char snode, register u_char skt)
379 {
380 	register const struct atNBPtuple *tp =
381 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
382 	int i;
383 	const u_char *ep;
384 
385 	if (length < nbpHeaderSize) {
386 		(void)printf(" truncated-nbp %d", length);
387 		return;
388 	}
389 
390 	length -= nbpHeaderSize;
391 	if (length < 8) {
392 		/* must be room for at least one tuple */
393 		if (np->control == nbpNATLKerr) {
394 			(void)printf(" nbp-netatalk_err");
395 			return;
396 		} else if (np->control == nbpNATLKok) {
397 			(void)printf(" nbp-netatalk_ok");
398 			return;
399 		}
400 		(void)printf(" truncated-nbp nbp-0x%x  %d (%d)",
401 			np->control, np->id, length + nbpHeaderSize);
402 		return;
403 	}
404 	/* ep points to end of available data */
405 	ep = snapend;
406 	if ((const u_char *)tp > ep) {
407 		fputs(tstr, stdout);
408 		return;
409 	}
410 	switch (i = np->control & 0xf0) {
411 
412 	case nbpBrRq:
413 	case nbpLkUp:
414 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
415 			     np->id);
416 		if ((const u_char *)(tp + 1) > ep) {
417 			fputs(tstr, stdout);
418 			return;
419 		}
420 		(void)nbp_name_print(tp, ep);
421 		/*
422 		 * look for anomalies: the spec says there can only
423 		 * be one tuple, the address must match the source
424 		 * address and the enumerator should be zero.
425 		 */
426 		if ((np->control & 0xf) != 1)
427 			(void)printf(" [ntup=%d]", np->control & 0xf);
428 		if (tp->enumerator)
429 			(void)printf(" [enum=%d]", tp->enumerator);
430 		if (EXTRACT_16BITS(&tp->net) != snet ||
431 		    tp->node != snode || tp->skt != skt)
432 			(void)printf(" [addr=%s.%d]",
433 			    ataddr_string(EXTRACT_16BITS(&tp->net),
434 			    tp->node), tp->skt);
435 		break;
436 
437 	case nbpLkUpReply:
438 		(void)printf(" nbp-reply %d:", np->id);
439 
440 		/* print each of the tuples in the reply */
441 		for (i = np->control & 0xf; --i >= 0 && tp; )
442 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
443 		break;
444 
445 	case nbpNATLKrgstr:
446 	case nbpNATLKunrgstr:
447 		(void)printf((i == nbpNATLKrgstr) ?
448 			" nbp-netatalk_rgstr %d:" :
449 			" nbp-netatalk_unrgstr %d:",
450 			np->id);
451 		for (i = np->control & 0xf; --i >= 0 && tp; )
452 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
453 		break;
454 
455 	default:
456 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
457 				length);
458 		break;
459 	}
460 }
461 
462 /* print a counted string */
463 static const char *
464 print_cstring(register const char *cp, register const u_char *ep)
465 {
466 	register u_int length;
467 
468 	if (cp >= (const char *)ep) {
469 		fputs(tstr, stdout);
470 		return (0);
471 	}
472 	length = *cp++;
473 
474 	/* Spec says string can be at most 32 bytes long */
475 	if (length < 0 || length > 32) {
476 		(void)printf("[len=%d]", length);
477 		return (0);
478 	}
479 	while ((int)--length >= 0) {
480 		if (cp >= (char *)ep) {
481 			fputs(tstr, stdout);
482 			return (0);
483 		}
484 		putchar(*cp++);
485 	}
486 	return (cp);
487 }
488 
489 static const struct atNBPtuple *
490 nbp_tuple_print(register const struct atNBPtuple *tp,
491 		register const u_char *ep,
492 		register u_short snet, register u_char snode,
493 		register u_char skt)
494 {
495 	register const struct atNBPtuple *tpn;
496 
497 	if ((const u_char *)(tp + 1) > ep) {
498 		fputs(tstr, stdout);
499 		return 0;
500 	}
501 	tpn = nbp_name_print(tp, ep);
502 
503 	/* if the enumerator isn't 1, print it */
504 	if (tp->enumerator != 1)
505 		(void)printf("(%d)", tp->enumerator);
506 
507 	/* if the socket doesn't match the src socket, print it */
508 	if (tp->skt != skt)
509 		(void)printf(" %d", tp->skt);
510 
511 	/* if the address doesn't match the src address, it's an anomaly */
512 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
513 		(void)printf(" [addr=%s]",
514 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
515 
516 	return (tpn);
517 }
518 
519 static const struct atNBPtuple *
520 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
521 {
522 	register const char *cp = (const char *)tp + nbpTupleSize;
523 
524 	putchar(' ');
525 
526 	/* Object */
527 	putchar('"');
528 	if ((cp = print_cstring(cp, ep)) != NULL) {
529 		/* Type */
530 		putchar(':');
531 		if ((cp = print_cstring(cp, ep)) != NULL) {
532 			/* Zone */
533 			putchar('@');
534 			if ((cp = print_cstring(cp, ep)) != NULL)
535 				putchar('"');
536 		}
537 	}
538 	return ((const struct atNBPtuple *)cp);
539 }
540 
541 
542 #define HASHNAMESIZE 4096
543 
544 struct hnamemem {
545 	int addr;
546 	char *name;
547 	struct hnamemem *nxt;
548 };
549 
550 static struct hnamemem hnametable[HASHNAMESIZE];
551 
552 /*
553  * see if there's an AppleTalk number to name map file.
554  */
555 static void
556 init_atalk(void)
557 {
558 	struct hnamemem *tp;
559 	char nambuf[HOST_NAME_MAX+1 + 20];
560 	char line[BUFSIZ];
561 	int i1, i2, i3;
562 
563 	priv_getlines(FTAB_APPLETALK);
564 	while (priv_getline(line, sizeof(line)) > 0) {
565 		if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
566 			continue;
567 		if (sscanf(line, "%d.%d.%d %255s", &i1, &i2, &i3, nambuf) == 4)
568 			/* got a hostname. */
569 			i3 |= ((i1 << 8) | i2) << 8;
570 		else if (sscanf(line, "%d.%d %255s", &i1, &i2, nambuf) == 3)
571 			/* got a net name */
572 			i3 = (((i1 << 8) | i2) << 8) | 255;
573 		else
574 			continue;
575 
576 		for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
577 		     tp->nxt; tp = tp->nxt)
578 			;
579 		tp->addr = i3;
580 		tp->nxt = newhnamemem();
581 		tp->name = savestr(nambuf);
582 	}
583 }
584 
585 static const char *
586 ataddr_string(u_short atnet, u_char athost)
587 {
588 	register struct hnamemem *tp, *tp2;
589 	register int i = (atnet << 8) | athost;
590 	char nambuf[HOST_NAME_MAX+1 + 20];
591 	static int first = 1;
592 
593 	if (first) {
594 		first = 0;
595 		init_atalk();
596 	}
597 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
598 		if (tp->addr == i)
599 			return (tp->name);
600 
601 	/* didn't have the node name -- see if we've got the net name */
602 	i |= 255;
603 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
604 		if (tp2->addr == i) {
605 			tp->addr = (atnet << 8) | athost;
606 			tp->nxt = newhnamemem();
607 			(void)snprintf(nambuf, sizeof nambuf, "%s.%d",
608 			    tp2->name, athost);
609 			tp->name = savestr(nambuf);
610 			return (tp->name);
611 		}
612 
613 	tp->addr = (atnet << 8) | athost;
614 	tp->nxt = newhnamemem();
615 	if (athost != 255)
616 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d.%d",
617 			atnet >> 8, atnet & 0xff, athost);
618 	else
619 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d",
620 			atnet >> 8, atnet & 0xff);
621 	tp->name = savestr(nambuf);
622 
623 	return (tp->name);
624 }
625 
626 static struct tok skt2str[] = {
627 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
628 	{ nbpSkt,	"nis" },	/* name info socket */
629 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
630 	{ zipSkt,	"zip" },	/* zone info protocol */
631 	{ 0,		NULL }
632 };
633 
634 static const char *
635 ddpskt_string(register int skt)
636 {
637 	static char buf[12];
638 
639 	if (nflag) {
640 		(void)snprintf(buf, sizeof buf, "%d", skt);
641 		return (buf);
642 	}
643 	return (tok2str(skt2str, "%d", skt));
644 }
645