xref: /openbsd-src/usr.sbin/tcpdump/print-atalk.c (revision 3a3fbb3f2e2521ab7c4a56b7ff7462ebd9095ec5) 
1 /*	$OpenBSD: print-atalk.c,v 1.18 2001/11/06 03:11:40 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     "@(#) $Header: /home/cvs/src/usr.sbin/tcpdump/print-atalk.c,v 1.18 2001/11/06 03:11:40 deraadt Exp $ (LBL)";
29 #endif
30 
31 #include <sys/param.h>
32 #include <sys/time.h>
33 #include <sys/socket.h>
34 
35 #ifdef __STDC__
36 struct mbuf;
37 struct rtentry;
38 #endif
39 #include <net/if.h>
40 
41 #include <netinet/in.h>
42 #include <netinet/in_systm.h>
43 #include <netinet/ip.h>
44 #include <netinet/ip_var.h>
45 #include <netinet/if_ether.h>
46 #include <netinet/udp.h>
47 #include <netinet/udp_var.h>
48 #include <netinet/tcp.h>
49 #include <netinet/tcpip.h>
50 
51 #include <stdio.h>
52 #include <stdlib.h>
53 #include <string.h>
54 
55 #include "interface.h"
56 #include "addrtoname.h"
57 #include "ethertype.h"
58 #include "extract.h"			/* must come after interface.h */
59 #include "appletalk.h"
60 #include "savestr.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 #ifdef LBL_ALIGN
228 	if ((long)bp & 3) {
229 		static u_char *abuf = NULL;
230 
231 		if (abuf == NULL) {
232 			abuf = (u_char *)malloc(snaplen);
233 			if (abuf == NULL)
234 				error("ddp_print: malloc");
235 		}
236 		memcpy(abuf, bp, min(length, snaplen));
237 		snapend += abuf - bp;
238 		packetp = abuf;
239 		bp = abuf;
240 	}
241 #endif
242 
243 	switch (t) {
244 
245 	case ddpNBP:
246 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
247 		break;
248 
249 	case ddpATP:
250 		atp_print((const struct atATP *)bp, length);
251 		break;
252 
253 	default:
254 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
255 		break;
256 	}
257 }
258 
259 static void
260 atp_print(register const struct atATP *ap, u_int length)
261 {
262 	char c;
263 	u_int32_t data;
264 
265 	if ((const u_char *)(ap + 1) > snapend) {
266 		/* Just bail if we don't have the whole chunk. */
267 		fputs(tstr, stdout);
268 		return;
269 	}
270 	length -= sizeof(*ap);
271 	switch (ap->control & 0xc0) {
272 
273 	case atpReqCode:
274 		(void)printf(" atp-req%s %d",
275 			     ap->control & atpXO? " " : "*",
276 			     EXTRACT_16BITS(&ap->transID));
277 
278 		atp_bitmap_print(ap->bitmap);
279 
280 		if (length != 0)
281 			(void)printf(" [len=%d]", length);
282 
283 		switch (ap->control & (atpEOM|atpSTS)) {
284 		case atpEOM:
285 			(void)printf(" [EOM]");
286 			break;
287 		case atpSTS:
288 			(void)printf(" [STS]");
289 			break;
290 		case atpEOM|atpSTS:
291 			(void)printf(" [EOM,STS]");
292 			break;
293 		}
294 		break;
295 
296 	case atpRspCode:
297 		(void)printf(" atp-resp%s%d:%d (%d)",
298 			     ap->control & atpEOM? "*" : " ",
299 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
300 		switch (ap->control & (atpXO|atpSTS)) {
301 		case atpXO:
302 			(void)printf(" [XO]");
303 			break;
304 		case atpSTS:
305 			(void)printf(" [STS]");
306 			break;
307 		case atpXO|atpSTS:
308 			(void)printf(" [XO,STS]");
309 			break;
310 		}
311 		break;
312 
313 	case atpRelCode:
314 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
315 
316 		atp_bitmap_print(ap->bitmap);
317 
318 		/* length should be zero */
319 		if (length)
320 			(void)printf(" [len=%d]", length);
321 
322 		/* there shouldn't be any control flags */
323 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
324 			c = '[';
325 			if (ap->control & atpXO) {
326 				(void)printf("%cXO", c);
327 				c = ',';
328 			}
329 			if (ap->control & atpEOM) {
330 				(void)printf("%cEOM", c);
331 				c = ',';
332 			}
333 			if (ap->control & atpSTS) {
334 				(void)printf("%cSTS", c);
335 				c = ',';
336 			}
337 			(void)printf("]");
338 		}
339 		break;
340 
341 	default:
342 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
343 			     EXTRACT_16BITS(&ap->transID), length);
344 		break;
345 	}
346 	data = EXTRACT_32BITS(&ap->userData);
347 	if (data != 0)
348 		(void)printf(" 0x%x", data);
349 }
350 
351 static void
352 atp_bitmap_print(register u_char bm)
353 {
354 	register char c;
355 	register int i;
356 
357 	/*
358 	 * The '& 0xff' below is needed for compilers that want to sign
359 	 * extend a u_char, which is the case with the Ultrix compiler.
360 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
361 	 */
362 	if ((bm + 1) & (bm & 0xff)) {
363 		c = '<';
364 		for (i = 0; bm; ++i) {
365 			if (bm & 1) {
366 				(void)printf("%c%d", c, i);
367 				c = ',';
368 			}
369 			bm >>= 1;
370 		}
371 		(void)printf(">");
372 	} else {
373 		for (i = 0; bm; ++i)
374 			bm >>= 1;
375 		if (i > 1)
376 			(void)printf("<0-%d>", i - 1);
377 		else
378 			(void)printf("<0>");
379 	}
380 }
381 
382 static void
383 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
384 	  register u_char snode, register u_char skt)
385 {
386 	register const struct atNBPtuple *tp =
387 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
388 	int i;
389 	const u_char *ep;
390 
391 	if (length < nbpHeaderSize) {
392 		(void)printf(" truncated-nbp %d", length);
393 		return;
394 	}
395 
396 	length -= nbpHeaderSize;
397 	if (length < 8) {
398 		/* must be room for at least one tuple */
399 		if (np->control == nbpNATLKerr) {
400 			(void)printf(" nbp-netatalk_err");
401 			return;
402 		} else if (np->control == nbpNATLKok) {
403 			(void)printf(" nbp-netatalk_ok");
404 			return;
405 		}
406 		(void)printf(" truncated-nbp nbp-0x%x  %d (%d)",
407 			np->control, np->id, length + nbpHeaderSize);
408 		return;
409 	}
410 	/* ep points to end of available data */
411 	ep = snapend;
412 	if ((const u_char *)tp > ep) {
413 		fputs(tstr, stdout);
414 		return;
415 	}
416 	switch (i = np->control & 0xf0) {
417 
418 	case nbpBrRq:
419 	case nbpLkUp:
420 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
421 			     np->id);
422 		if ((const u_char *)(tp + 1) > ep) {
423 			fputs(tstr, stdout);
424 			return;
425 		}
426 		(void)nbp_name_print(tp, ep);
427 		/*
428 		 * look for anomalies: the spec says there can only
429 		 * be one tuple, the address must match the source
430 		 * address and the enumerator should be zero.
431 		 */
432 		if ((np->control & 0xf) != 1)
433 			(void)printf(" [ntup=%d]", np->control & 0xf);
434 		if (tp->enumerator)
435 			(void)printf(" [enum=%d]", tp->enumerator);
436 		if (EXTRACT_16BITS(&tp->net) != snet ||
437 		    tp->node != snode || tp->skt != skt)
438 			(void)printf(" [addr=%s.%d]",
439 			    ataddr_string(EXTRACT_16BITS(&tp->net),
440 			    tp->node), tp->skt);
441 		break;
442 
443 	case nbpLkUpReply:
444 		(void)printf(" nbp-reply %d:", np->id);
445 
446 		/* print each of the tuples in the reply */
447 		for (i = np->control & 0xf; --i >= 0 && tp; )
448 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
449 		break;
450 
451 	case nbpNATLKrgstr:
452 	case nbpNATLKunrgstr:
453 		(void)printf((i == nbpNATLKrgstr) ?
454 			" nbp-netatalk_rgstr %d:" :
455 			" nbp-netatalk_unrgstr %d:",
456 			np->id);
457 		for (i = np->control & 0xf; --i >= 0 && tp; )
458 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
459 		break;
460 
461 	default:
462 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
463 				length);
464 		break;
465 	}
466 }
467 
468 /* print a counted string */
469 static const char *
470 print_cstring(register const char *cp, register const u_char *ep)
471 {
472 	register u_int length;
473 
474 	if (cp >= (const char *)ep) {
475 		fputs(tstr, stdout);
476 		return (0);
477 	}
478 	length = *cp++;
479 
480 	/* Spec says string can be at most 32 bytes long */
481 	if (length < 0 || length > 32) {
482 		(void)printf("[len=%d]", length);
483 		return (0);
484 	}
485 	while ((int)--length >= 0) {
486 		if (cp >= (char *)ep) {
487 			fputs(tstr, stdout);
488 			return (0);
489 		}
490 		putchar(*cp++);
491 	}
492 	return (cp);
493 }
494 
495 static const struct atNBPtuple *
496 nbp_tuple_print(register const struct atNBPtuple *tp,
497 		register const u_char *ep,
498 		register u_short snet, register u_char snode,
499 		register u_char skt)
500 {
501 	register const struct atNBPtuple *tpn;
502 
503 	if ((const u_char *)(tp + 1) > ep) {
504 		fputs(tstr, stdout);
505 		return 0;
506 	}
507 	tpn = nbp_name_print(tp, ep);
508 
509 	/* if the enumerator isn't 1, print it */
510 	if (tp->enumerator != 1)
511 		(void)printf("(%d)", tp->enumerator);
512 
513 	/* if the socket doesn't match the src socket, print it */
514 	if (tp->skt != skt)
515 		(void)printf(" %d", tp->skt);
516 
517 	/* if the address doesn't match the src address, it's an anomaly */
518 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
519 		(void)printf(" [addr=%s]",
520 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
521 
522 	return (tpn);
523 }
524 
525 static const struct atNBPtuple *
526 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
527 {
528 	register const char *cp = (const char *)tp + nbpTupleSize;
529 
530 	putchar(' ');
531 
532 	/* Object */
533 	putchar('"');
534 	if ((cp = print_cstring(cp, ep)) != NULL) {
535 		/* Type */
536 		putchar(':');
537 		if ((cp = print_cstring(cp, ep)) != NULL) {
538 			/* Zone */
539 			putchar('@');
540 			if ((cp = print_cstring(cp, ep)) != NULL)
541 				putchar('"');
542 		}
543 	}
544 	return ((const struct atNBPtuple *)cp);
545 }
546 
547 
548 #define HASHNAMESIZE 4096
549 
550 struct hnamemem {
551 	int addr;
552 	char *name;
553 	struct hnamemem *nxt;
554 };
555 
556 static struct hnamemem hnametable[HASHNAMESIZE];
557 
558 static const char *
559 ataddr_string(u_short atnet, u_char athost)
560 {
561 	register struct hnamemem *tp, *tp2;
562 	register int i = (atnet << 8) | athost;
563 	char nambuf[MAXHOSTNAMELEN + 20];
564 	static int first = 1;
565 	FILE *fp;
566 
567 	/*
568 	 * if this is the first call, see if there's an AppleTalk
569 	 * number to name map file.
570 	 */
571 	if (first && (first = 0, !nflag)
572 	    && (fp = fopen("/etc/atalk.names", "r"))) {
573 		char line[256];
574 		int i1, i2, i3;
575 
576 		while (fgets(line, sizeof(line), fp)) {
577 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
578 				continue;
579 			if (sscanf(line, "%d.%d.%d %255s", &i1, &i2, &i3,
580 				     nambuf) == 4)
581 				/* got a hostname. */
582 				i3 |= ((i1 << 8) | i2) << 8;
583 			else if (sscanf(line, "%d.%d %255s", &i1, &i2,
584 					nambuf) == 3)
585 				/* got a net name */
586 				i3 = (((i1 << 8) | i2) << 8) | 255;
587 			else
588 				continue;
589 
590 			for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
591 			     tp->nxt; tp = tp->nxt)
592 				;
593 			tp->addr = i3;
594 			tp->nxt = newhnamemem();
595 			tp->name = savestr(nambuf);
596 		}
597 		fclose(fp);
598 	}
599 
600 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
601 		if (tp->addr == i)
602 			return (tp->name);
603 
604 	/* didn't have the node name -- see if we've got the net name */
605 	i |= 255;
606 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
607 		if (tp2->addr == i) {
608 			tp->addr = (atnet << 8) | athost;
609 			tp->nxt = newhnamemem();
610 			(void)snprintf(nambuf, sizeof nambuf, "%s.%d",
611 			    tp2->name, athost);
612 			tp->name = savestr(nambuf);
613 			return (tp->name);
614 		}
615 
616 	tp->addr = (atnet << 8) | athost;
617 	tp->nxt = newhnamemem();
618 	if (athost != 255)
619 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d.%d",
620 			atnet >> 8, atnet & 0xff, athost);
621 	else
622 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d",
623 			atnet >> 8, atnet & 0xff);
624 	tp->name = savestr(nambuf);
625 
626 	return (tp->name);
627 }
628 
629 static struct tok skt2str[] = {
630 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
631 	{ nbpSkt,	"nis" },	/* name info socket */
632 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
633 	{ zipSkt,	"zip" },	/* zone info protocol */
634 	{ 0,		NULL }
635 };
636 
637 static const char *
638 ddpskt_string(register int skt)
639 {
640 	static char buf[10];
641 
642 	if (nflag) {
643 		(void)snprintf(buf, sizeof buf, "%d", skt);
644 		return (buf);
645 	}
646 	return (tok2str(skt2str, "%d", skt));
647 }
648