xref: /openbsd-src/usr.sbin/tcpdump/print-atalk.c (revision f6aab3d83b51b91c24247ad2c2573574de475a82) 
1 /*	$OpenBSD: print-atalk.c,v 1.35 2021/12/01 18:28:45 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 #include <net/if.h>
30 
31 #include <netinet/in.h>
32 #include <netinet/ip.h>
33 #include <netinet/ip_var.h>
34 #include <netinet/if_ether.h>
35 #include <netinet/udp.h>
36 #include <netinet/udp_var.h>
37 #include <netinet/tcp.h>
38 
39 #include <inttypes.h>
40 #include <stdio.h>
41 #include <stdlib.h>
42 #include <string.h>
43 #include <limits.h>
44 
45 #include "interface.h"
46 #include "addrtoname.h"
47 #include "ethertype.h"
48 #include "extract.h"			/* must come after interface.h */
49 #include "appletalk.h"
50 #include "savestr.h"
51 #include "privsep.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 Datagram Delivery Protocol packets
90  * without the LLAP encapsulating header (i.e.
91  * from Ethertalk)
92  */
93 void
94 atalk_print(const u_char *bp, u_int length)
95 {
96 	const struct atDDP *dp;
97 	u_short snet;
98 
99 	if (length < ddpSize) {
100 		printf(" [|ddp %d]", length);
101 		return;
102 	}
103 	dp = (const struct atDDP *)bp;
104 	snet = EXTRACT_16BITS(&dp->srcNet);
105 	printf("%s.%s", ataddr_string(snet, dp->srcNode),
106 	    ddpskt_string(dp->srcSkt));
107 	printf(" > %s.%s:",
108 	    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
109 	    ddpskt_string(dp->dstSkt));
110 	bp += ddpSize;
111 	length -= ddpSize;
112 	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
113 }
114 
115 /*
116  * Print AppleTalk Datagram Delivery Protocol packets
117  * from localtalk (i.e. the 230 Kbps net built into
118  * every Macintosh). We can get these from a localtalk
119  * interface if we have one, or from UDP encapsulated tunnels.
120  */
121 void
122 atalk_print_llap(const u_char *bp, u_int length)
123 {
124 	const struct LAP *lp;
125 	const struct atDDP *dp;
126 	const struct atShortDDP *sdp;
127 	u_short snet;
128 
129 	if (length < sizeof(*lp)) {
130 		printf(" [|llap %d]", length);
131 		return;
132 	}
133 
134 	lp = (struct LAP *)bp;
135 	bp += sizeof(*lp);
136 	length -= sizeof(*lp);
137 	switch (lp->type) {
138 
139 	case lapShortDDP:
140 		if (length < ddpSSize) {
141 			printf(" [|sddp %d]", length);
142 			return;
143 		}
144 		sdp = (const struct atShortDDP *)bp;
145 		printf("%s.%s",
146 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
147 		printf(" > %s.%s:",
148 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
149 		bp += ddpSSize;
150 		length -= ddpSSize;
151 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
152 		break;
153 
154 	case lapDDP:
155 		if (length < ddpSize) {
156 			printf(" [|ddp %d]", length);
157 			return;
158 		}
159 		dp = (const struct atDDP *)bp;
160 		snet = EXTRACT_16BITS(&dp->srcNet);
161 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
162 		    ddpskt_string(dp->srcSkt));
163 		printf(" > %s.%s:",
164 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
165 		    ddpskt_string(dp->dstSkt));
166 		bp += ddpSize;
167 		length -= ddpSize;
168 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
169 		break;
170 
171 #ifdef notdef
172 	case lapKLAP:
173 		klap_print(bp, length);
174 		break;
175 #endif
176 
177 	default:
178 		printf("%d > %d at-lap#%d %d",
179 		    lp->src, lp->dst, lp->type, length);
180 		break;
181 	}
182 }
183 
184 /* XXX should probably pass in the snap header and do checks like arp_print() */
185 void
186 aarp_print(const u_char *bp, u_int length)
187 {
188 	const struct aarp *ap;
189 
190 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
191 
192 	printf("aarp ");
193 	ap = (const struct aarp *)bp;
194 	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
195 	    ap->halen == 6 && ap->palen == 4 )
196 		switch (ntohs(ap->op)) {
197 
198 		case 1:				/* request */
199 			printf("who-has %s tell %s",
200 			    AT(pdaddr), AT(psaddr));
201 			return;
202 
203 		case 2:				/* response */
204 			printf("reply %s is-at %s",
205 			    AT(pdaddr), etheraddr_string(ap->hdaddr));
206 			return;
207 
208 		case 3:				/* probe (oy!) */
209 			printf("probe %s tell %s",
210 			    AT(pdaddr), AT(psaddr));
211 			return;
212 		}
213 	printf("len %u op %u htype %u ptype %#x halen %u palen %u",
214 	    length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
215 	    ap->halen, ap->palen);
216 }
217 
218 static void
219 ddp_print(const u_char *bp, u_int length, int t,
220 	  u_short snet, u_char snode, u_char skt)
221 {
222 
223 	if ((intptr_t)bp & (sizeof(long)-1)) {
224 		static u_char *abuf = NULL;
225 		int clen = snapend - bp;
226 		if (clen > snaplen)
227 			clen = snaplen;
228 
229 		if (abuf == NULL) {
230 			abuf = malloc(snaplen);
231 			if (abuf == NULL)
232 				error("ddp_print: malloc");
233 		}
234 		memmove((char *)abuf, (char *)bp, min(length, clen));
235 		snapend = abuf + clen;
236 		packetp = abuf;
237 		bp = abuf;
238 	}
239 
240 	switch (t) {
241 
242 	case ddpNBP:
243 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
244 		break;
245 
246 	case ddpATP:
247 		atp_print((const struct atATP *)bp, length);
248 		break;
249 
250 	default:
251 		printf(" at-%s %d", tok2str(type2str, NULL, t), length);
252 		break;
253 	}
254 }
255 
256 static void
257 atp_print(const struct atATP *ap, u_int length)
258 {
259 	char c;
260 	u_int32_t data;
261 
262 	if ((const u_char *)(ap + 1) > snapend) {
263 		/* Just bail if we don't have the whole chunk. */
264 		printf("%s", tstr);
265 		return;
266 	}
267 	length -= sizeof(*ap);
268 	switch (ap->control & 0xc0) {
269 
270 	case atpReqCode:
271 		printf(" atp-req%s %d",
272 		    ap->control & atpXO? " " : "*",
273 		    EXTRACT_16BITS(&ap->transID));
274 
275 		atp_bitmap_print(ap->bitmap);
276 
277 		if (length != 0)
278 			printf(" [len=%d]", length);
279 
280 		switch (ap->control & (atpEOM|atpSTS)) {
281 		case atpEOM:
282 			printf(" [EOM]");
283 			break;
284 		case atpSTS:
285 			printf(" [STS]");
286 			break;
287 		case atpEOM|atpSTS:
288 			printf(" [EOM,STS]");
289 			break;
290 		}
291 		break;
292 
293 	case atpRspCode:
294 		printf(" atp-resp%s%d:%d (%d)",
295 		    ap->control & atpEOM? "*" : " ",
296 		    EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
297 		switch (ap->control & (atpXO|atpSTS)) {
298 		case atpXO:
299 			printf(" [XO]");
300 			break;
301 		case atpSTS:
302 			printf(" [STS]");
303 			break;
304 		case atpXO|atpSTS:
305 			printf(" [XO,STS]");
306 			break;
307 		}
308 		break;
309 
310 	case atpRelCode:
311 		printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
312 
313 		atp_bitmap_print(ap->bitmap);
314 
315 		/* length should be zero */
316 		if (length)
317 			printf(" [len=%d]", length);
318 
319 		/* there shouldn't be any control flags */
320 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
321 			c = '[';
322 			if (ap->control & atpXO) {
323 				printf("%cXO", c);
324 				c = ',';
325 			}
326 			if (ap->control & atpEOM) {
327 				printf("%cEOM", c);
328 				c = ',';
329 			}
330 			if (ap->control & atpSTS) {
331 				printf("%cSTS", c);
332 				c = ',';
333 			}
334 			printf("]");
335 		}
336 		break;
337 
338 	default:
339 		printf(" atp-0x%x  %d (%d)", ap->control,
340 		    EXTRACT_16BITS(&ap->transID), length);
341 		break;
342 	}
343 	data = EXTRACT_32BITS(&ap->userData);
344 	if (data != 0)
345 		printf(" 0x%x", data);
346 }
347 
348 static void
349 atp_bitmap_print(u_char bm)
350 {
351 	char c;
352 	int i;
353 
354 	/*
355 	 * The '& 0xff' below is needed for compilers that want to sign
356 	 * extend a u_char, which is the case with the Ultrix compiler.
357 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
358 	 */
359 	if ((bm + 1) & (bm & 0xff)) {
360 		c = '<';
361 		for (i = 0; bm; ++i) {
362 			if (bm & 1) {
363 				printf("%c%d", c, i);
364 				c = ',';
365 			}
366 			bm >>= 1;
367 		}
368 		printf(">");
369 	} else {
370 		for (i = 0; bm; ++i)
371 			bm >>= 1;
372 		if (i > 1)
373 			printf("<0-%d>", i - 1);
374 		else
375 			printf("<0>");
376 	}
377 }
378 
379 static void
380 nbp_print(const struct atNBP *np, u_int length, u_short snet,
381 	  u_char snode, u_char skt)
382 {
383 	const struct atNBPtuple *tp =
384 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
385 	int i;
386 	const u_char *ep;
387 
388 	if (length < nbpHeaderSize) {
389 		printf(" truncated-nbp %d", length);
390 		return;
391 	}
392 
393 	length -= nbpHeaderSize;
394 	if (length < 8) {
395 		/* must be room for at least one tuple */
396 		if (np->control == nbpNATLKerr) {
397 			printf(" nbp-netatalk_err");
398 			return;
399 		} else if (np->control == nbpNATLKok) {
400 			printf(" nbp-netatalk_ok");
401 			return;
402 		}
403 		printf(" truncated-nbp nbp-0x%x  %d (%d)",
404 		    np->control, np->id, length + nbpHeaderSize);
405 		return;
406 	}
407 	/* ep points to end of available data */
408 	ep = snapend;
409 	if ((const u_char *)tp > ep) {
410 		printf("%s", tstr);
411 		return;
412 	}
413 	switch (i = np->control & 0xf0) {
414 
415 	case nbpBrRq:
416 	case nbpLkUp:
417 		printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:", np->id);
418 		if ((const u_char *)(tp + 1) > ep) {
419 			printf("%s", tstr);
420 			return;
421 		}
422 		(void)nbp_name_print(tp, ep);
423 		/*
424 		 * look for anomalies: the spec says there can only
425 		 * be one tuple, the address must match the source
426 		 * address and the enumerator should be zero.
427 		 */
428 		if ((np->control & 0xf) != 1)
429 			printf(" [ntup=%d]", np->control & 0xf);
430 		if (tp->enumerator)
431 			printf(" [enum=%d]", tp->enumerator);
432 		if (EXTRACT_16BITS(&tp->net) != snet ||
433 		    tp->node != snode || tp->skt != skt)
434 			printf(" [addr=%s.%d]",
435 			    ataddr_string(EXTRACT_16BITS(&tp->net),
436 			    tp->node), tp->skt);
437 		break;
438 
439 	case nbpLkUpReply:
440 		printf(" nbp-reply %d:", np->id);
441 
442 		/* print each of the tuples in the reply */
443 		for (i = np->control & 0xf; --i >= 0 && tp; )
444 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
445 		break;
446 
447 	case nbpNATLKrgstr:
448 	case nbpNATLKunrgstr:
449 		printf((i == nbpNATLKrgstr) ?
450 		    " nbp-netatalk_rgstr %d:" :
451 		    " nbp-netatalk_unrgstr %d:",
452 		    np->id);
453 		for (i = np->control & 0xf; --i >= 0 && tp; )
454 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
455 		break;
456 
457 	default:
458 		printf(" nbp-0x%x  %d (%d)", np->control, np->id,
459 		    length);
460 		break;
461 	}
462 }
463 
464 /* print a counted string */
465 static const char *
466 print_cstring(const char *cp, const u_char *ep)
467 {
468 	u_int length;
469 
470 	if (cp >= (const char *)ep) {
471 		printf("%s", tstr);
472 		return (0);
473 	}
474 	length = *cp++;
475 
476 	/* Spec says string can be at most 32 bytes long */
477 	if (length > 32) {
478 		printf("[len=%d]", length);
479 		return (0);
480 	}
481 	while ((int)--length >= 0) {
482 		if (cp >= (char *)ep) {
483 			printf("%s", tstr);
484 			return (0);
485 		}
486 		putchar(*cp++);
487 	}
488 	return (cp);
489 }
490 
491 static const struct atNBPtuple *
492 nbp_tuple_print(const struct atNBPtuple *tp,
493 		const u_char *ep,
494 		u_short snet, u_char snode,
495 		u_char skt)
496 {
497 	const struct atNBPtuple *tpn;
498 
499 	if ((const u_char *)(tp + 1) > ep) {
500 		printf("%s", tstr);
501 		return 0;
502 	}
503 	tpn = nbp_name_print(tp, ep);
504 
505 	/* if the enumerator isn't 1, print it */
506 	if (tp->enumerator != 1)
507 		printf("(%d)", tp->enumerator);
508 
509 	/* if the socket doesn't match the src socket, print it */
510 	if (tp->skt != skt)
511 		printf(" %d", tp->skt);
512 
513 	/* if the address doesn't match the src address, it's an anomaly */
514 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
515 		printf(" [addr=%s]",
516 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
517 
518 	return (tpn);
519 }
520 
521 static const struct atNBPtuple *
522 nbp_name_print(const struct atNBPtuple *tp, const u_char *ep)
523 {
524 	const char *cp = (const char *)tp + nbpTupleSize;
525 
526 	putchar(' ');
527 
528 	/* Object */
529 	putchar('"');
530 	if ((cp = print_cstring(cp, ep)) != NULL) {
531 		/* Type */
532 		putchar(':');
533 		if ((cp = print_cstring(cp, ep)) != NULL) {
534 			/* Zone */
535 			putchar('@');
536 			if ((cp = print_cstring(cp, ep)) != NULL)
537 				putchar('"');
538 		}
539 	}
540 	return ((const struct atNBPtuple *)cp);
541 }
542 
543 
544 #define HASHNAMESIZE 4096
545 
546 struct hnamemem {
547 	int addr;
548 	char *name;
549 	struct hnamemem *nxt;
550 };
551 
552 static struct hnamemem hnametable[HASHNAMESIZE];
553 
554 static const char *
555 ataddr_string(u_short atnet, u_char athost)
556 {
557 	struct hnamemem *tp, *tp2;
558 	int i = (atnet << 8) | athost;
559 	char nambuf[HOST_NAME_MAX+1 + 20];
560 
561 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
562 		if (tp->addr == i)
563 			return (tp->name);
564 
565 	/* didn't have the node name -- see if we've got the net name */
566 	i |= 255;
567 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
568 		if (tp2->addr == i) {
569 			tp->addr = (atnet << 8) | athost;
570 			tp->nxt = newhnamemem();
571 			(void)snprintf(nambuf, sizeof nambuf, "%s.%d",
572 			    tp2->name, athost);
573 			tp->name = savestr(nambuf);
574 			return (tp->name);
575 		}
576 
577 	tp->addr = (atnet << 8) | athost;
578 	tp->nxt = newhnamemem();
579 	if (athost != 255)
580 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d.%d",
581 			atnet >> 8, atnet & 0xff, athost);
582 	else
583 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d",
584 			atnet >> 8, atnet & 0xff);
585 	tp->name = savestr(nambuf);
586 
587 	return (tp->name);
588 }
589 
590 static struct tok skt2str[] = {
591 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
592 	{ nbpSkt,	"nis" },	/* name info socket */
593 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
594 	{ zipSkt,	"zip" },	/* zone info protocol */
595 	{ 0,		NULL }
596 };
597 
598 static const char *
599 ddpskt_string(int skt)
600 {
601 	static char buf[12];
602 
603 	if (nflag) {
604 		(void)snprintf(buf, sizeof buf, "%d", skt);
605 		return (buf);
606 	}
607 	return (tok2str(skt2str, "%d", skt));
608 }
609