xref: /openbsd/usr.sbin/tcpdump/print-atalk.c (revision db3296cf) 
1 /*	$OpenBSD: print-atalk.c,v 1.20 2003/04/14 21:28:10 pvalchev 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 1.20 2003/04/14 21:28:10 pvalchev 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 <stdio.h>
50 #include <stdlib.h>
51 #include <string.h>
52 
53 #include "interface.h"
54 #include "addrtoname.h"
55 #include "ethertype.h"
56 #include "extract.h"			/* must come after interface.h */
57 #include "appletalk.h"
58 #include "savestr.h"
59 
60 static struct tok type2str[] = {
61 	{ ddpRTMP,		"rtmp" },
62 	{ ddpRTMPrequest,	"rtmpReq" },
63 	{ ddpECHO,		"echo" },
64 	{ ddpIP,		"IP" },
65 	{ ddpARP,		"ARP" },
66 	{ ddpKLAP,		"KLAP" },
67 	{ 0,			NULL }
68 };
69 
70 struct aarp {
71 	u_int16_t	htype, ptype;
72 	u_int8_t	halen, palen;
73 	u_int16_t	op;
74 	u_int8_t	hsaddr[6];
75 	u_int8_t	psaddr[4];
76 	u_int8_t	hdaddr[6];
77 	u_int8_t	pdaddr[4];
78 };
79 
80 static char tstr[] = "[|atalk]";
81 
82 static void atp_print(const struct atATP *, u_int);
83 static void atp_bitmap_print(u_char);
84 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
85 static const char *print_cstring(const char *, const u_char *);
86 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
87 						const u_char *,
88 						u_short, u_char, u_char);
89 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
90 					       const u_char *);
91 static const char *ataddr_string(u_short, u_char);
92 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
93 static const char *ddpskt_string(int);
94 
95 /*
96  * Print AppleTalk Datagram Delivery Protocol packets
97  * without the LLAP encapsulating header (i.e.
98  * from Ethertalk)
99  */
100 void
101 atalk_print(register const u_char *bp, u_int length)
102 {
103 	register const struct atDDP *dp;
104 	u_short snet;
105 
106 	if (length < ddpSize) {
107 		(void)printf(" [|ddp %d]", length);
108 		return;
109 	}
110 	dp = (const struct atDDP *)bp;
111 	snet = EXTRACT_16BITS(&dp->srcNet);
112 	printf("%s.%s", ataddr_string(snet, dp->srcNode),
113 	    ddpskt_string(dp->srcSkt));
114 	printf(" > %s.%s:",
115 	    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
116 	    ddpskt_string(dp->dstSkt));
117 	bp += ddpSize;
118 	length -= ddpSize;
119 	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
120 }
121 
122 /*
123  * Print AppleTalk Datagram Delivery Protocol packets
124  * from localtalk (i.e. the 230 Kbps net built into
125  * every Macintosh). We can get these from a localtalk
126  * interface if we have one, or from UDP encapsulated tunnels.
127  */
128 void
129 atalk_print_llap(register const u_char *bp, u_int length)
130 {
131 	register const struct LAP *lp;
132 	register const struct atDDP *dp;
133 	register const struct atShortDDP *sdp;
134 	u_short snet;
135 
136 	lp = (struct LAP *)bp;
137 	bp += sizeof(*lp);
138 	length -= sizeof(*lp);
139 	switch (lp->type) {
140 
141 	case lapShortDDP:
142 		if (length < ddpSSize) {
143 			(void)printf(" [|sddp %d]", length);
144 			return;
145 		}
146 		sdp = (const struct atShortDDP *)bp;
147 		printf("%s.%s",
148 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
149 		printf(" > %s.%s:",
150 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
151 		bp += ddpSSize;
152 		length -= ddpSSize;
153 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
154 		break;
155 
156 	case lapDDP:
157 		if (length < ddpSize) {
158 			(void)printf(" [|ddp %d]", length);
159 			return;
160 		}
161 		dp = (const struct atDDP *)bp;
162 		snet = EXTRACT_16BITS(&dp->srcNet);
163 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
164 		    ddpskt_string(dp->srcSkt));
165 		printf(" > %s.%s:",
166 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
167 		    ddpskt_string(dp->dstSkt));
168 		bp += ddpSize;
169 		length -= ddpSize;
170 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
171 		break;
172 
173 #ifdef notdef
174 	case lapKLAP:
175 		klap_print(bp, length);
176 		break;
177 #endif
178 
179 	default:
180 		printf("%d > %d at-lap#%d %d",
181 		    lp->src, lp->dst, lp->type, length);
182 		break;
183 	}
184 }
185 
186 /* XXX should probably pass in the snap header and do checks like arp_print() */
187 void
188 aarp_print(register const u_char *bp, u_int length)
189 {
190 	register const struct aarp *ap;
191 
192 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
193 
194 	printf("aarp ");
195 	ap = (const struct aarp *)bp;
196 	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
197 	    ap->halen == 6 && ap->palen == 4 )
198 		switch (ntohs(ap->op)) {
199 
200 		case 1:				/* request */
201 			(void)printf("who-has %s tell %s",
202 			    AT(pdaddr), AT(psaddr));
203 			return;
204 
205 		case 2:				/* response */
206 			(void)printf("reply %s is-at %s",
207 			    AT(pdaddr), etheraddr_string(ap->hdaddr));
208 			return;
209 
210 		case 3:				/* probe (oy!) */
211 			(void)printf("probe %s tell %s",
212 			    AT(pdaddr), AT(psaddr));
213 			return;
214 		}
215 	(void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
216 	    length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
217 	    ap->halen, ap->palen);
218 }
219 
220 static void
221 ddp_print(register const u_char *bp, register u_int length, register int t,
222 	  register u_short snet, register u_char snode, u_char skt)
223 {
224 
225 #ifdef LBL_ALIGN
226 	if ((long)bp & 3) {
227 		static u_char *abuf = NULL;
228 
229 		if (abuf == NULL) {
230 			abuf = (u_char *)malloc(snaplen);
231 			if (abuf == NULL)
232 				error("ddp_print: malloc");
233 		}
234 		memcpy(abuf, bp, min(length, snaplen));
235 		snapend += abuf - bp;
236 		packetp = abuf;
237 		bp = abuf;
238 	}
239 #endif
240 
241 	switch (t) {
242 
243 	case ddpNBP:
244 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
245 		break;
246 
247 	case ddpATP:
248 		atp_print((const struct atATP *)bp, length);
249 		break;
250 
251 	default:
252 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
253 		break;
254 	}
255 }
256 
257 static void
258 atp_print(register const struct atATP *ap, u_int length)
259 {
260 	char c;
261 	u_int32_t data;
262 
263 	if ((const u_char *)(ap + 1) > snapend) {
264 		/* Just bail if we don't have the whole chunk. */
265 		fputs(tstr, stdout);
266 		return;
267 	}
268 	length -= sizeof(*ap);
269 	switch (ap->control & 0xc0) {
270 
271 	case atpReqCode:
272 		(void)printf(" atp-req%s %d",
273 			     ap->control & atpXO? " " : "*",
274 			     EXTRACT_16BITS(&ap->transID));
275 
276 		atp_bitmap_print(ap->bitmap);
277 
278 		if (length != 0)
279 			(void)printf(" [len=%d]", length);
280 
281 		switch (ap->control & (atpEOM|atpSTS)) {
282 		case atpEOM:
283 			(void)printf(" [EOM]");
284 			break;
285 		case atpSTS:
286 			(void)printf(" [STS]");
287 			break;
288 		case atpEOM|atpSTS:
289 			(void)printf(" [EOM,STS]");
290 			break;
291 		}
292 		break;
293 
294 	case atpRspCode:
295 		(void)printf(" atp-resp%s%d:%d (%d)",
296 			     ap->control & atpEOM? "*" : " ",
297 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
298 		switch (ap->control & (atpXO|atpSTS)) {
299 		case atpXO:
300 			(void)printf(" [XO]");
301 			break;
302 		case atpSTS:
303 			(void)printf(" [STS]");
304 			break;
305 		case atpXO|atpSTS:
306 			(void)printf(" [XO,STS]");
307 			break;
308 		}
309 		break;
310 
311 	case atpRelCode:
312 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
313 
314 		atp_bitmap_print(ap->bitmap);
315 
316 		/* length should be zero */
317 		if (length)
318 			(void)printf(" [len=%d]", length);
319 
320 		/* there shouldn't be any control flags */
321 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
322 			c = '[';
323 			if (ap->control & atpXO) {
324 				(void)printf("%cXO", c);
325 				c = ',';
326 			}
327 			if (ap->control & atpEOM) {
328 				(void)printf("%cEOM", c);
329 				c = ',';
330 			}
331 			if (ap->control & atpSTS) {
332 				(void)printf("%cSTS", c);
333 				c = ',';
334 			}
335 			(void)printf("]");
336 		}
337 		break;
338 
339 	default:
340 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
341 			     EXTRACT_16BITS(&ap->transID), length);
342 		break;
343 	}
344 	data = EXTRACT_32BITS(&ap->userData);
345 	if (data != 0)
346 		(void)printf(" 0x%x", data);
347 }
348 
349 static void
350 atp_bitmap_print(register u_char bm)
351 {
352 	register char c;
353 	register int i;
354 
355 	/*
356 	 * The '& 0xff' below is needed for compilers that want to sign
357 	 * extend a u_char, which is the case with the Ultrix compiler.
358 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
359 	 */
360 	if ((bm + 1) & (bm & 0xff)) {
361 		c = '<';
362 		for (i = 0; bm; ++i) {
363 			if (bm & 1) {
364 				(void)printf("%c%d", c, i);
365 				c = ',';
366 			}
367 			bm >>= 1;
368 		}
369 		(void)printf(">");
370 	} else {
371 		for (i = 0; bm; ++i)
372 			bm >>= 1;
373 		if (i > 1)
374 			(void)printf("<0-%d>", i - 1);
375 		else
376 			(void)printf("<0>");
377 	}
378 }
379 
380 static void
381 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
382 	  register u_char snode, register u_char skt)
383 {
384 	register const struct atNBPtuple *tp =
385 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
386 	int i;
387 	const u_char *ep;
388 
389 	if (length < nbpHeaderSize) {
390 		(void)printf(" truncated-nbp %d", length);
391 		return;
392 	}
393 
394 	length -= nbpHeaderSize;
395 	if (length < 8) {
396 		/* must be room for at least one tuple */
397 		if (np->control == nbpNATLKerr) {
398 			(void)printf(" nbp-netatalk_err");
399 			return;
400 		} else if (np->control == nbpNATLKok) {
401 			(void)printf(" nbp-netatalk_ok");
402 			return;
403 		}
404 		(void)printf(" truncated-nbp nbp-0x%x  %d (%d)",
405 			np->control, np->id, length + nbpHeaderSize);
406 		return;
407 	}
408 	/* ep points to end of available data */
409 	ep = snapend;
410 	if ((const u_char *)tp > ep) {
411 		fputs(tstr, stdout);
412 		return;
413 	}
414 	switch (i = np->control & 0xf0) {
415 
416 	case nbpBrRq:
417 	case nbpLkUp:
418 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
419 			     np->id);
420 		if ((const u_char *)(tp + 1) > ep) {
421 			fputs(tstr, stdout);
422 			return;
423 		}
424 		(void)nbp_name_print(tp, ep);
425 		/*
426 		 * look for anomalies: the spec says there can only
427 		 * be one tuple, the address must match the source
428 		 * address and the enumerator should be zero.
429 		 */
430 		if ((np->control & 0xf) != 1)
431 			(void)printf(" [ntup=%d]", np->control & 0xf);
432 		if (tp->enumerator)
433 			(void)printf(" [enum=%d]", tp->enumerator);
434 		if (EXTRACT_16BITS(&tp->net) != snet ||
435 		    tp->node != snode || tp->skt != skt)
436 			(void)printf(" [addr=%s.%d]",
437 			    ataddr_string(EXTRACT_16BITS(&tp->net),
438 			    tp->node), tp->skt);
439 		break;
440 
441 	case nbpLkUpReply:
442 		(void)printf(" nbp-reply %d:", np->id);
443 
444 		/* print each of the tuples in the reply */
445 		for (i = np->control & 0xf; --i >= 0 && tp; )
446 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
447 		break;
448 
449 	case nbpNATLKrgstr:
450 	case nbpNATLKunrgstr:
451 		(void)printf((i == nbpNATLKrgstr) ?
452 			" nbp-netatalk_rgstr %d:" :
453 			" nbp-netatalk_unrgstr %d:",
454 			np->id);
455 		for (i = np->control & 0xf; --i >= 0 && tp; )
456 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
457 		break;
458 
459 	default:
460 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
461 				length);
462 		break;
463 	}
464 }
465 
466 /* print a counted string */
467 static const char *
468 print_cstring(register const char *cp, register const u_char *ep)
469 {
470 	register u_int length;
471 
472 	if (cp >= (const char *)ep) {
473 		fputs(tstr, stdout);
474 		return (0);
475 	}
476 	length = *cp++;
477 
478 	/* Spec says string can be at most 32 bytes long */
479 	if (length < 0 || length > 32) {
480 		(void)printf("[len=%d]", length);
481 		return (0);
482 	}
483 	while ((int)--length >= 0) {
484 		if (cp >= (char *)ep) {
485 			fputs(tstr, stdout);
486 			return (0);
487 		}
488 		putchar(*cp++);
489 	}
490 	return (cp);
491 }
492 
493 static const struct atNBPtuple *
494 nbp_tuple_print(register const struct atNBPtuple *tp,
495 		register const u_char *ep,
496 		register u_short snet, register u_char snode,
497 		register u_char skt)
498 {
499 	register const struct atNBPtuple *tpn;
500 
501 	if ((const u_char *)(tp + 1) > ep) {
502 		fputs(tstr, stdout);
503 		return 0;
504 	}
505 	tpn = nbp_name_print(tp, ep);
506 
507 	/* if the enumerator isn't 1, print it */
508 	if (tp->enumerator != 1)
509 		(void)printf("(%d)", tp->enumerator);
510 
511 	/* if the socket doesn't match the src socket, print it */
512 	if (tp->skt != skt)
513 		(void)printf(" %d", tp->skt);
514 
515 	/* if the address doesn't match the src address, it's an anomaly */
516 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
517 		(void)printf(" [addr=%s]",
518 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
519 
520 	return (tpn);
521 }
522 
523 static const struct atNBPtuple *
524 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
525 {
526 	register const char *cp = (const char *)tp + nbpTupleSize;
527 
528 	putchar(' ');
529 
530 	/* Object */
531 	putchar('"');
532 	if ((cp = print_cstring(cp, ep)) != NULL) {
533 		/* Type */
534 		putchar(':');
535 		if ((cp = print_cstring(cp, ep)) != NULL) {
536 			/* Zone */
537 			putchar('@');
538 			if ((cp = print_cstring(cp, ep)) != NULL)
539 				putchar('"');
540 		}
541 	}
542 	return ((const struct atNBPtuple *)cp);
543 }
544 
545 
546 #define HASHNAMESIZE 4096
547 
548 struct hnamemem {
549 	int addr;
550 	char *name;
551 	struct hnamemem *nxt;
552 };
553 
554 static struct hnamemem hnametable[HASHNAMESIZE];
555 
556 static const char *
557 ataddr_string(u_short atnet, u_char athost)
558 {
559 	register struct hnamemem *tp, *tp2;
560 	register int i = (atnet << 8) | athost;
561 	char nambuf[MAXHOSTNAMELEN + 20];
562 	static int first = 1;
563 	FILE *fp;
564 
565 	/*
566 	 * if this is the first call, see if there's an AppleTalk
567 	 * number to name map file.
568 	 */
569 	if (first && (first = 0, !nflag)
570 	    && (fp = fopen("/etc/atalk.names", "r"))) {
571 		char line[256];
572 		int i1, i2, i3;
573 
574 		while (fgets(line, sizeof(line), fp)) {
575 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
576 				continue;
577 			if (sscanf(line, "%d.%d.%d %255s", &i1, &i2, &i3,
578 				     nambuf) == 4)
579 				/* got a hostname. */
580 				i3 |= ((i1 << 8) | i2) << 8;
581 			else if (sscanf(line, "%d.%d %255s", &i1, &i2,
582 					nambuf) == 3)
583 				/* got a net name */
584 				i3 = (((i1 << 8) | i2) << 8) | 255;
585 			else
586 				continue;
587 
588 			for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
589 			     tp->nxt; tp = tp->nxt)
590 				;
591 			tp->addr = i3;
592 			tp->nxt = newhnamemem();
593 			tp->name = savestr(nambuf);
594 		}
595 		fclose(fp);
596 	}
597 
598 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
599 		if (tp->addr == i)
600 			return (tp->name);
601 
602 	/* didn't have the node name -- see if we've got the net name */
603 	i |= 255;
604 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
605 		if (tp2->addr == i) {
606 			tp->addr = (atnet << 8) | athost;
607 			tp->nxt = newhnamemem();
608 			(void)snprintf(nambuf, sizeof nambuf, "%s.%d",
609 			    tp2->name, athost);
610 			tp->name = savestr(nambuf);
611 			return (tp->name);
612 		}
613 
614 	tp->addr = (atnet << 8) | athost;
615 	tp->nxt = newhnamemem();
616 	if (athost != 255)
617 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d.%d",
618 			atnet >> 8, atnet & 0xff, athost);
619 	else
620 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d",
621 			atnet >> 8, atnet & 0xff);
622 	tp->name = savestr(nambuf);
623 
624 	return (tp->name);
625 }
626 
627 static struct tok skt2str[] = {
628 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
629 	{ nbpSkt,	"nis" },	/* name info socket */
630 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
631 	{ zipSkt,	"zip" },	/* zone info protocol */
632 	{ 0,		NULL }
633 };
634 
635 static const char *
636 ddpskt_string(register int skt)
637 {
638 	static char buf[12];
639 
640 	if (nflag) {
641 		(void)snprintf(buf, sizeof buf, "%d", skt);
642 		return (buf);
643 	}
644 	return (tok2str(skt2str, "%d", skt));
645 }
646