xref: /openbsd-src/usr.sbin/tcpdump/print-atalk.c (revision 62a742911104f98b9185b2c6b6007d9b1c36396c) 
1 /*
2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that: (1) source code distributions
7  * retain the above copyright notice and this paragraph in its entirety, (2)
8  * distributions including binary code include the above copyright notice and
9  * this paragraph in its entirety in the documentation or other materials
10  * provided with the distribution, and (3) all advertising materials mentioning
11  * features or use of this software display the following acknowledgement:
12  * ``This product includes software developed by the University of California,
13  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14  * the University nor the names of its contributors may be used to endorse
15  * or promote products derived from this software without specific prior
16  * written permission.
17  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20  *
21  * Format and print AppleTalk packets.
22  */
23 
24 #ifndef lint
25 static const char rcsid[] =
26     "@(#) $Header: /home/cvs/src/usr.sbin/tcpdump/print-atalk.c,v 1.9 1998/07/13 22:13:46 deraadt Exp $ (LBL)";
27 #endif
28 
29 #include <sys/param.h>
30 #include <sys/time.h>
31 #include <sys/socket.h>
32 
33 #ifdef __STDC__
34 struct mbuf;
35 struct rtentry;
36 #endif
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 
59 static struct tok type2str[] = {
60 	{ ddpRTMP,		"rtmp" },
61 	{ ddpRTMPrequest,	"rtmpReq" },
62 	{ ddpECHO,		"echo" },
63 	{ ddpIP,		"IP" },
64 	{ ddpARP,		"ARP" },
65 	{ ddpKLAP,		"KLAP" },
66 	{ 0,			NULL }
67 };
68 
69 struct aarp {
70 	u_short htype, ptype;
71 	u_char	halen, palen;
72 	u_short op;
73 	u_char	hsaddr[6];
74 	u_char	psaddr[4];
75 	u_char	hdaddr[6];
76 	u_char	pdaddr[4];
77 };
78 
79 static char tstr[] = "[|atalk]";
80 
81 static void atp_print(const struct atATP *, u_int);
82 static void atp_bitmap_print(u_char);
83 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
84 static const char *print_cstring(const char *, const u_char *);
85 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
86 						const u_char *,
87 						u_short, u_char, u_char);
88 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
89 					       const u_char *);
90 static const char *ataddr_string(u_short, u_char);
91 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
92 static const char *ddpskt_string(int);
93 
94 /*
95  * Print AppleTalk Datagram Delivery Protocol packets
96  * without the LLAP encapsulating header (i.e.
97  * from Ethertalk)
98  */
99 void
100 atalk_print(register const u_char *bp, u_int length)
101 {
102 	register const struct atDDP *dp;
103 	u_short snet;
104 
105 	if (length < ddpSize) {
106 		(void)printf(" [|ddp %d]", length);
107 		return;
108 	}
109 	dp = (const struct atDDP *)bp;
110 	snet = EXTRACT_16BITS(&dp->srcNet);
111 	printf("%s.%s", ataddr_string(snet, dp->srcNode),
112 	    ddpskt_string(dp->srcSkt));
113 	printf(" > %s.%s:",
114 	    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
115 	    ddpskt_string(dp->dstSkt));
116 	bp += ddpSize;
117 	length -= ddpSize;
118 	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
119 }
120 
121 /*
122  * Print AppleTalk Datagram Delivery Protocol packets
123  * from localtalk (i.e. the 230 Kbps net built into
124  * every Macintosh). We can get these from a localtalk
125  * interface if we have one, or from UDP encapsulated tunnels.
126  */
127 void
128 atalk_print_llap(register const u_char *bp, u_int length)
129 {
130 	register const struct LAP *lp;
131 	register const struct atDDP *dp;
132 	register const struct atShortDDP *sdp;
133 	u_short snet;
134 
135 	lp = (struct LAP *)bp;
136 	bp += sizeof(*lp);
137 	length -= sizeof(*lp);
138 	switch (lp->type) {
139 
140 	case lapShortDDP:
141 		if (length < ddpSSize) {
142 			(void)printf(" [|sddp %d]", length);
143 			return;
144 		}
145 		sdp = (const struct atShortDDP *)bp;
146 		printf("%s.%s",
147 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
148 		printf(" > %s.%s:",
149 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
150 		bp += ddpSSize;
151 		length -= ddpSSize;
152 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
153 		break;
154 
155 	case lapDDP:
156 		if (length < ddpSize) {
157 			(void)printf(" [|ddp %d]", length);
158 			return;
159 		}
160 		dp = (const struct atDDP *)bp;
161 		snet = EXTRACT_16BITS(&dp->srcNet);
162 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
163 		    ddpskt_string(dp->srcSkt));
164 		printf(" > %s.%s:",
165 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
166 		    ddpskt_string(dp->dstSkt));
167 		bp += ddpSize;
168 		length -= ddpSize;
169 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
170 		break;
171 
172 #ifdef notdef
173 	case lapKLAP:
174 		klap_print(bp, length);
175 		break;
176 #endif
177 
178 	default:
179 		printf("%d > %d at-lap#%d %d",
180 		    lp->src, lp->dst, lp->type, length);
181 		break;
182 	}
183 }
184 
185 /* XXX should probably pass in the snap header and do checks like arp_print() */
186 void
187 aarp_print(register const u_char *bp, u_int length)
188 {
189 	register const struct aarp *ap;
190 
191 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
192 
193 	printf("aarp ");
194 	ap = (const struct aarp *)bp;
195 	if (ap->htype == 1 && ap->ptype == ETHERTYPE_ATALK &&
196 	    ap->halen == 6 && ap->palen == 4 )
197 		switch (ap->op) {
198 
199 		case 1:				/* request */
200 			(void)printf("who-has %s tell %s",
201 			    AT(pdaddr), AT(psaddr));
202 			return;
203 
204 		case 2:				/* response */
205 			(void)printf("reply %s is-at %s",
206 			    AT(pdaddr), etheraddr_string(ap->hdaddr));
207 			return;
208 
209 		case 3:				/* probe (oy!) */
210 			(void)printf("probe %s tell %s",
211 			    AT(pdaddr), AT(psaddr));
212 			return;
213 		}
214 	(void)printf("len %d op %d htype %d ptype %#x halen %d palen %d",
215 	    length, ap->op, ap->htype, ap->ptype, ap->halen, ap->palen );
216 }
217 
218 static void
219 ddp_print(register const u_char *bp, register u_int length, register int t,
220 	  register u_short snet, register u_char snode, u_char skt)
221 {
222 
223 	switch (t) {
224 
225 	case ddpNBP:
226 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
227 		break;
228 
229 	case ddpATP:
230 		atp_print((const struct atATP *)bp, length);
231 		break;
232 
233 	default:
234 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
235 		break;
236 	}
237 }
238 
239 static void
240 atp_print(register const struct atATP *ap, u_int length)
241 {
242 	char c;
243 	u_int32_t data;
244 
245 	if ((const u_char *)(ap + 1) > snapend) {
246 		/* Just bail if we don't have the whole chunk. */
247 		fputs(tstr, stdout);
248 		return;
249 	}
250 	length -= sizeof(*ap);
251 	switch (ap->control & 0xc0) {
252 
253 	case atpReqCode:
254 		(void)printf(" atp-req%s %d",
255 			     ap->control & atpXO? " " : "*",
256 			     EXTRACT_16BITS(&ap->transID));
257 
258 		atp_bitmap_print(ap->bitmap);
259 
260 		if (length != 0)
261 			(void)printf(" [len=%d]", length);
262 
263 		switch (ap->control & (atpEOM|atpSTS)) {
264 		case atpEOM:
265 			(void)printf(" [EOM]");
266 			break;
267 		case atpSTS:
268 			(void)printf(" [STS]");
269 			break;
270 		case atpEOM|atpSTS:
271 			(void)printf(" [EOM,STS]");
272 			break;
273 		}
274 		break;
275 
276 	case atpRspCode:
277 		(void)printf(" atp-resp%s%d:%d (%d)",
278 			     ap->control & atpEOM? "*" : " ",
279 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
280 		switch (ap->control & (atpXO|atpSTS)) {
281 		case atpXO:
282 			(void)printf(" [XO]");
283 			break;
284 		case atpSTS:
285 			(void)printf(" [STS]");
286 			break;
287 		case atpXO|atpSTS:
288 			(void)printf(" [XO,STS]");
289 			break;
290 		}
291 		break;
292 
293 	case atpRelCode:
294 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
295 
296 		atp_bitmap_print(ap->bitmap);
297 
298 		/* length should be zero */
299 		if (length)
300 			(void)printf(" [len=%d]", length);
301 
302 		/* there shouldn't be any control flags */
303 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
304 			c = '[';
305 			if (ap->control & atpXO) {
306 				(void)printf("%cXO", c);
307 				c = ',';
308 			}
309 			if (ap->control & atpEOM) {
310 				(void)printf("%cEOM", c);
311 				c = ',';
312 			}
313 			if (ap->control & atpSTS) {
314 				(void)printf("%cSTS", c);
315 				c = ',';
316 			}
317 			(void)printf("]");
318 		}
319 		break;
320 
321 	default:
322 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
323 			     EXTRACT_16BITS(&ap->transID), length);
324 		break;
325 	}
326 	data = EXTRACT_32BITS(&ap->userData);
327 	if (data != 0)
328 		(void)printf(" 0x%x", data);
329 }
330 
331 static void
332 atp_bitmap_print(register u_char bm)
333 {
334 	register char c;
335 	register int i;
336 
337 	/*
338 	 * The '& 0xff' below is needed for compilers that want to sign
339 	 * extend a u_char, which is the case with the Ultrix compiler.
340 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
341 	 */
342 	if ((bm + 1) & (bm & 0xff)) {
343 		c = '<';
344 		for (i = 0; bm; ++i) {
345 			if (bm & 1) {
346 				(void)printf("%c%d", c, i);
347 				c = ',';
348 			}
349 			bm >>= 1;
350 		}
351 		(void)printf(">");
352 	} else {
353 		for (i = 0; bm; ++i)
354 			bm >>= 1;
355 		if (i > 1)
356 			(void)printf("<0-%d>", i - 1);
357 		else
358 			(void)printf("<0>");
359 	}
360 }
361 
362 static void
363 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
364 	  register u_char snode, register u_char skt)
365 {
366 	register const struct atNBPtuple *tp =
367 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
368 	int i;
369 	const u_char *ep;
370 
371 	if (length < nbpHeaderSize) {
372 		(void)printf(" truncated-nbp %d", length);
373 		return;
374 	}
375 
376 	length -= nbpHeaderSize;
377 	if (length < 8) {
378 		/* must be room for at least one tuple */
379 		if (np->control == nbpNATLKerr) {
380 			(void)printf(" nbp-netatalk_err");
381 			return;
382 		} else if (np->control == nbpNATLKok) {
383 			(void)printf(" nbp-netatalk_ok");
384 			return;
385 		}
386 		(void)printf(" truncated-nbp nbp-0x%x  %d (%d)",
387 			np->control, np->id, length + nbpHeaderSize);
388 		return;
389 	}
390 	/* ep points to end of available data */
391 	ep = snapend;
392 	if ((const u_char *)tp > ep) {
393 		fputs(tstr, stdout);
394 		return;
395 	}
396 	switch (i = np->control & 0xf0) {
397 
398 	case nbpBrRq:
399 	case nbpLkUp:
400 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
401 			     np->id);
402 		if ((const u_char *)(tp + 1) > ep) {
403 			fputs(tstr, stdout);
404 			return;
405 		}
406 		(void)nbp_name_print(tp, ep);
407 		/*
408 		 * look for anomalies: the spec says there can only
409 		 * be one tuple, the address must match the source
410 		 * address and the enumerator should be zero.
411 		 */
412 		if ((np->control & 0xf) != 1)
413 			(void)printf(" [ntup=%d]", np->control & 0xf);
414 		if (tp->enumerator)
415 			(void)printf(" [enum=%d]", tp->enumerator);
416 		if (EXTRACT_16BITS(&tp->net) != snet ||
417 		    tp->node != snode || tp->skt != skt)
418 			(void)printf(" [addr=%s.%d]",
419 			    ataddr_string(EXTRACT_16BITS(&tp->net),
420 			    tp->node), tp->skt);
421 		break;
422 
423 	case nbpLkUpReply:
424 		(void)printf(" nbp-reply %d:", np->id);
425 
426 		/* print each of the tuples in the reply */
427 		for (i = np->control & 0xf; --i >= 0 && tp; )
428 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
429 		break;
430 
431 	case nbpNATLKrgstr:
432 	case nbpNATLKunrgstr:
433 		(void)printf((i == nbpNATLKrgstr) ?
434 			" nbp-netatalk_rgstr %d:" :
435 			" nbp-netatalk_unrgstr %d:",
436 			np->id);
437 		for (i = np->control & 0xf; --i >= 0 && tp; )
438 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
439 		break;
440 
441 	default:
442 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
443 				length);
444 		break;
445 	}
446 }
447 
448 /* print a counted string */
449 static const char *
450 print_cstring(register const char *cp, register const u_char *ep)
451 {
452 	register u_int length;
453 
454 	if (cp >= (const char *)ep) {
455 		fputs(tstr, stdout);
456 		return (0);
457 	}
458 	length = *cp++;
459 
460 	/* Spec says string can be at most 32 bytes long */
461 	if (length < 0 || length > 32) {
462 		(void)printf("[len=%d]", length);
463 		return (0);
464 	}
465 	while (--length >= 0) {
466 		if (cp >= (char *)ep) {
467 			fputs(tstr, stdout);
468 			return (0);
469 		}
470 		putchar(*cp++);
471 	}
472 	return (cp);
473 }
474 
475 static const struct atNBPtuple *
476 nbp_tuple_print(register const struct atNBPtuple *tp,
477 		register const u_char *ep,
478 		register u_short snet, register u_char snode,
479 		register u_char skt)
480 {
481 	register const struct atNBPtuple *tpn;
482 
483 	if ((const u_char *)(tp + 1) > ep) {
484 		fputs(tstr, stdout);
485 		return 0;
486 	}
487 	tpn = nbp_name_print(tp, ep);
488 
489 	/* if the enumerator isn't 1, print it */
490 	if (tp->enumerator != 1)
491 		(void)printf("(%d)", tp->enumerator);
492 
493 	/* if the socket doesn't match the src socket, print it */
494 	if (tp->skt != skt)
495 		(void)printf(" %d", tp->skt);
496 
497 	/* if the address doesn't match the src address, it's an anomaly */
498 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
499 		(void)printf(" [addr=%s]",
500 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
501 
502 	return (tpn);
503 }
504 
505 static const struct atNBPtuple *
506 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
507 {
508 	register const char *cp = (const char *)tp + nbpTupleSize;
509 
510 	putchar(' ');
511 
512 	/* Object */
513 	putchar('"');
514 	if ((cp = print_cstring(cp, ep)) != NULL) {
515 		/* Type */
516 		putchar(':');
517 		if ((cp = print_cstring(cp, ep)) != NULL) {
518 			/* Zone */
519 			putchar('@');
520 			if ((cp = print_cstring(cp, ep)) != NULL)
521 				putchar('"');
522 		}
523 	}
524 	return ((const struct atNBPtuple *)cp);
525 }
526 
527 
528 #define HASHNAMESIZE 4096
529 
530 struct hnamemem {
531 	int addr;
532 	char *name;
533 	struct hnamemem *nxt;
534 };
535 
536 static struct hnamemem hnametable[HASHNAMESIZE];
537 
538 static const char *
539 ataddr_string(u_short atnet, u_char athost)
540 {
541 	register struct hnamemem *tp, *tp2;
542 	register int i = (atnet << 8) | athost;
543 	char nambuf[256];
544 	static int first = 1;
545 	FILE *fp;
546 
547 	/*
548 	 * if this is the first call, see if there's an AppleTalk
549 	 * number to name map file.
550 	 */
551 	if (first && (first = 0, !nflag)
552 	    && (fp = fopen("/etc/atalk.names", "r"))) {
553 		char line[256];
554 		int i1, i2, i3;
555 
556 		while (fgets(line, sizeof(line), fp)) {
557 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
558 				continue;
559 			if (sscanf(line, "%d.%d.%d %255s", &i1, &i2, &i3,
560 				     nambuf) == 4)
561 				/* got a hostname. */
562 				i3 |= ((i1 << 8) | i2) << 8;
563 			else if (sscanf(line, "%d.%d %255s", &i1, &i2,
564 					nambuf) == 3)
565 				/* got a net name */
566 				i3 = (((i1 << 8) | i2) << 8) | 255;
567 			else
568 				continue;
569 
570 			for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
571 			     tp->nxt; tp = tp->nxt)
572 				;
573 			tp->addr = i3;
574 			tp->nxt = newhnamemem();
575 			tp->name = savestr(nambuf);
576 		}
577 		fclose(fp);
578 	}
579 
580 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
581 		if (tp->addr == i)
582 			return (tp->name);
583 
584 	/* didn't have the node name -- see if we've got the net name */
585 	i |= 255;
586 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
587 		if (tp2->addr == i) {
588 			tp->addr = (atnet << 8) | athost;
589 			tp->nxt = newhnamemem();
590 			(void)snprintf(nambuf, sizeof nambuf, "%s.%d",
591 			    tp2->name, athost);
592 			tp->name = savestr(nambuf);
593 			return (tp->name);
594 		}
595 
596 	tp->addr = (atnet << 8) | athost;
597 	tp->nxt = newhnamemem();
598 	if (athost != 255)
599 		(void)snprintf(nambuf, sizeof nambuf, "%d.%d", atnet, athost);
600 	else
601 		(void)snprintf(nambuf, sizeof nambuf, "%d", atnet);
602 	tp->name = savestr(nambuf);
603 
604 	return (tp->name);
605 }
606 
607 static struct tok skt2str[] = {
608 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
609 	{ nbpSkt,	"nis" },	/* name info socket */
610 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
611 	{ zipSkt,	"zip" },	/* zone info protocol */
612 	{ 0,		NULL }
613 };
614 
615 static const char *
616 ddpskt_string(register int skt)
617 {
618 	static char buf[10];
619 
620 	if (nflag) {
621 		(void)sprintf(buf, "%d", skt);
622 		return (buf);
623 	}
624 	return (tok2str(skt2str, "%d", skt));
625 }
626