xref: /freebsd/contrib/tcpdump/print-atalk.c (revision daf1cffce2e07931f27c6c6998652e90df6ba87e) 
1 /*
2  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
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  * $FreeBSD$
24  */
25 
26 #ifndef lint
27 static const char rcsid[] =
28     "@(#) $Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.51 1999/11/21 09:36:48 fenner Exp $ (LBL)";
29 #endif
30 
31 #ifdef HAVE_CONFIG_H
32 #include "config.h"
33 #endif
34 
35 #include <sys/param.h>
36 #include <sys/time.h>
37 #include <sys/socket.h>
38 
39 #if __STDC__
40 struct mbuf;
41 struct rtentry;
42 #endif
43 #include <net/if.h>
44 
45 #include <netinet/in.h>
46 #include <netinet/in_systm.h>
47 #include <netinet/ip.h>
48 #include <netinet/ip_var.h>
49 #include <net/ethernet.h>
50 #include <netinet/udp.h>
51 #include <netinet/udp_var.h>
52 #include <netinet/tcp.h>
53 
54 #include <stdio.h>
55 #include <stdlib.h>
56 #include <string.h>
57 
58 #include "interface.h"
59 #include "addrtoname.h"
60 #include "ethertype.h"
61 #include "extract.h"			/* must come after interface.h */
62 #include "appletalk.h"
63 #include "savestr.h"
64 
65 static struct tok type2str[] = {
66 	{ ddpRTMP,		"rtmp" },
67 	{ ddpRTMPrequest,	"rtmpReq" },
68 	{ ddpECHO,		"echo" },
69 	{ ddpIP,		"IP" },
70 	{ ddpARP,		"ARP" },
71 	{ ddpKLAP,		"KLAP" },
72 	{ 0,			NULL }
73 };
74 
75 struct aarp {
76 	u_short htype, ptype;
77 	u_char	halen, palen;
78 	u_short op;
79 	u_char	hsaddr[6];
80 	u_char	psaddr[4];
81 	u_char	hdaddr[6];
82 	u_char	pdaddr[4];
83 };
84 
85 static char tstr[] = "[|atalk]";
86 
87 static void atp_print(const struct atATP *, u_int);
88 static void atp_bitmap_print(u_char);
89 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
90 static const char *print_cstring(const char *, const u_char *);
91 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
92 						const u_char *,
93 						u_short, u_char, u_char);
94 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
95 					       const u_char *);
96 static const char *ataddr_string(u_short, u_char);
97 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
98 static const char *ddpskt_string(int);
99 
100 /*
101  * Print AppleTalk Datagram Delivery Protocol packets.
102  */
103 void
104 atalk_print(register const u_char *bp, u_int length)
105 {
106 	register const struct LAP *lp;
107 	register const struct atDDP *dp;
108 	register const struct atShortDDP *sdp;
109 	u_short snet;
110 
111 #if 0
112 	lp = (struct LAP *)bp;
113 	bp += sizeof(*lp);
114 	length -= sizeof(*lp);
115 #else
116 	{
117 		static struct LAP lp_ = {0, 0, lapDDP};
118 		lp = &lp_;
119 	}
120 #endif
121 	switch (lp->type) {
122 
123 	case lapShortDDP:
124 		if (length < ddpSSize) {
125 			(void)printf(" [|sddp %d]", length);
126 			return;
127 		}
128 		sdp = (const struct atShortDDP *)bp;
129 		printf("%s.%s",
130 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
131 		printf(" > %s.%s:",
132 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
133 		bp += ddpSSize;
134 		length -= ddpSSize;
135 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
136 		break;
137 
138 	case lapDDP:
139 		if (length < ddpSize) {
140 			(void)printf(" [|ddp %d]", length);
141 			return;
142 		}
143 		dp = (const struct atDDP *)bp;
144 		snet = EXTRACT_16BITS(&dp->srcNet);
145 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
146 		    ddpskt_string(dp->srcSkt));
147 		printf(" > %s.%s:",
148 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
149 		    ddpskt_string(dp->dstSkt));
150 		bp += ddpSize;
151 		length -= ddpSize;
152 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
153 		break;
154 
155 #ifdef notdef
156 	case lapKLAP:
157 		klap_print(bp, length);
158 		break;
159 #endif
160 
161 	default:
162 		printf("%d > %d at-lap#%d %d",
163 		    lp->src, lp->dst, lp->type, length);
164 		break;
165 	}
166 }
167 
168 /* XXX should probably pass in the snap header and do checks like arp_print() */
169 void
170 aarp_print(register const u_char *bp, u_int length)
171 {
172 	register const struct aarp *ap;
173 
174 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
175 
176 	printf("aarp ");
177 	ap = (const struct aarp *)bp;
178 	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
179 	    ap->halen == 6 && ap->palen == 4 )
180 		switch (ntohs(ap->op)) {
181 
182 		case 1:				/* request */
183 			(void)printf("who-has %s tell %s",
184 			    AT(pdaddr), AT(psaddr));
185 			return;
186 
187 		case 2:				/* response */
188 			(void)printf("reply %s is-at %s",
189 			    AT(psaddr), etheraddr_string(ap->hsaddr));
190 			return;
191 
192 		case 3:				/* probe (oy!) */
193 			(void)printf("probe %s tell %s",
194 			    AT(pdaddr), AT(psaddr));
195 			return;
196 		}
197 	(void)printf("len %d op %d htype %d ptype %#x halen %d palen %d",
198 	    length, ap->op, ap->htype, ap->ptype, ap->halen, ap->palen );
199 }
200 
201 static void
202 ddp_print(register const u_char *bp, register u_int length, register int t,
203 	  register u_short snet, register u_char snode, u_char skt)
204 {
205 
206 	switch (t) {
207 
208 	case ddpNBP:
209 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
210 		break;
211 
212 	case ddpATP:
213 		atp_print((const struct atATP *)bp, length);
214 		break;
215 
216 	default:
217 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
218 		break;
219 	}
220 }
221 
222 static void
223 atp_print(register const struct atATP *ap, u_int length)
224 {
225 	char c;
226 	u_int32_t data;
227 
228 	if ((const u_char *)(ap + 1) > snapend) {
229 		/* Just bail if we don't have the whole chunk. */
230 		fputs(tstr, stdout);
231 		return;
232 	}
233 	length -= sizeof(*ap);
234 	switch (ap->control & 0xc0) {
235 
236 	case atpReqCode:
237 		(void)printf(" atp-req%s %d",
238 			     ap->control & atpXO? " " : "*",
239 			     EXTRACT_16BITS(&ap->transID));
240 
241 		atp_bitmap_print(ap->bitmap);
242 
243 		if (length != 0)
244 			(void)printf(" [len=%d]", length);
245 
246 		switch (ap->control & (atpEOM|atpSTS)) {
247 		case atpEOM:
248 			(void)printf(" [EOM]");
249 			break;
250 		case atpSTS:
251 			(void)printf(" [STS]");
252 			break;
253 		case atpEOM|atpSTS:
254 			(void)printf(" [EOM,STS]");
255 			break;
256 		}
257 		break;
258 
259 	case atpRspCode:
260 		(void)printf(" atp-resp%s%d:%d (%d)",
261 			     ap->control & atpEOM? "*" : " ",
262 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
263 		switch (ap->control & (atpXO|atpSTS)) {
264 		case atpXO:
265 			(void)printf(" [XO]");
266 			break;
267 		case atpSTS:
268 			(void)printf(" [STS]");
269 			break;
270 		case atpXO|atpSTS:
271 			(void)printf(" [XO,STS]");
272 			break;
273 		}
274 		break;
275 
276 	case atpRelCode:
277 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
278 
279 		atp_bitmap_print(ap->bitmap);
280 
281 		/* length should be zero */
282 		if (length)
283 			(void)printf(" [len=%d]", length);
284 
285 		/* there shouldn't be any control flags */
286 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
287 			c = '[';
288 			if (ap->control & atpXO) {
289 				(void)printf("%cXO", c);
290 				c = ',';
291 			}
292 			if (ap->control & atpEOM) {
293 				(void)printf("%cEOM", c);
294 				c = ',';
295 			}
296 			if (ap->control & atpSTS) {
297 				(void)printf("%cSTS", c);
298 				c = ',';
299 			}
300 			(void)printf("]");
301 		}
302 		break;
303 
304 	default:
305 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
306 			     EXTRACT_16BITS(&ap->transID), length);
307 		break;
308 	}
309 	data = EXTRACT_32BITS(&ap->userData);
310 	if (data != 0)
311 		(void)printf(" 0x%x", data);
312 }
313 
314 static void
315 atp_bitmap_print(register u_char bm)
316 {
317 	register char c;
318 	register int i;
319 
320 	/*
321 	 * The '& 0xff' below is needed for compilers that want to sign
322 	 * extend a u_char, which is the case with the Ultrix compiler.
323 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
324 	 */
325 	if ((bm + 1) & (bm & 0xff)) {
326 		c = '<';
327 		for (i = 0; bm; ++i) {
328 			if (bm & 1) {
329 				(void)printf("%c%d", c, i);
330 				c = ',';
331 			}
332 			bm >>= 1;
333 		}
334 		(void)printf(">");
335 	} else {
336 		for (i = 0; bm; ++i)
337 			bm >>= 1;
338 		if (i > 1)
339 			(void)printf("<0-%d>", i - 1);
340 		else
341 			(void)printf("<0>");
342 	}
343 }
344 
345 static void
346 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
347 	  register u_char snode, register u_char skt)
348 {
349 	register const struct atNBPtuple *tp =
350 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
351 	int i;
352 	const u_char *ep;
353 
354 	length -= nbpHeaderSize;
355 	if (length < 8) {
356 		/* must be room for at least one tuple */
357 		(void)printf(" truncated-nbp %d", length + nbpHeaderSize);
358 		return;
359 	}
360 	/* ep points to end of available data */
361 	ep = snapend;
362 	if ((const u_char *)tp > ep) {
363 		fputs(tstr, stdout);
364 		return;
365 	}
366 	switch (i = np->control & 0xf0) {
367 
368 	case nbpBrRq:
369 	case nbpLkUp:
370 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
371 			     np->id);
372 		if ((const u_char *)(tp + 1) > ep) {
373 			fputs(tstr, stdout);
374 			return;
375 		}
376 		(void)nbp_name_print(tp, ep);
377 		/*
378 		 * look for anomalies: the spec says there can only
379 		 * be one tuple, the address must match the source
380 		 * address and the enumerator should be zero.
381 		 */
382 		if ((np->control & 0xf) != 1)
383 			(void)printf(" [ntup=%d]", np->control & 0xf);
384 		if (tp->enumerator)
385 			(void)printf(" [enum=%d]", tp->enumerator);
386 		if (EXTRACT_16BITS(&tp->net) != snet ||
387 		    tp->node != snode || tp->skt != skt)
388 			(void)printf(" [addr=%s.%d]",
389 			    ataddr_string(EXTRACT_16BITS(&tp->net),
390 			    tp->node), tp->skt);
391 		break;
392 
393 	case nbpLkUpReply:
394 		(void)printf(" nbp-reply %d:", np->id);
395 
396 		/* print each of the tuples in the reply */
397 		for (i = np->control & 0xf; --i >= 0 && tp; )
398 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
399 		break;
400 
401 	default:
402 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
403 				length);
404 		break;
405 	}
406 }
407 
408 /* print a counted string */
409 static const char *
410 print_cstring(register const char *cp, register const u_char *ep)
411 {
412 	register u_int length;
413 
414 	if (cp >= (const char *)ep) {
415 		fputs(tstr, stdout);
416 		return (0);
417 	}
418 	length = *cp++;
419 
420 	/* Spec says string can be at most 32 bytes long */
421 	if (length > 32) {
422 		(void)printf("[len=%u]", length);
423 		return (0);
424 	}
425 	while ((int)--length >= 0) {
426 		if (cp >= (char *)ep) {
427 			fputs(tstr, stdout);
428 			return (0);
429 		}
430 		putchar(*cp++);
431 	}
432 	return (cp);
433 }
434 
435 static const struct atNBPtuple *
436 nbp_tuple_print(register const struct atNBPtuple *tp,
437 		register const u_char *ep,
438 		register u_short snet, register u_char snode,
439 		register u_char skt)
440 {
441 	register const struct atNBPtuple *tpn;
442 
443 	if ((const u_char *)(tp + 1) > ep) {
444 		fputs(tstr, stdout);
445 		return 0;
446 	}
447 	tpn = nbp_name_print(tp, ep);
448 
449 	/* if the enumerator isn't 1, print it */
450 	if (tp->enumerator != 1)
451 		(void)printf("(%d)", tp->enumerator);
452 
453 	/* if the socket doesn't match the src socket, print it */
454 	if (tp->skt != skt)
455 		(void)printf(" %d", tp->skt);
456 
457 	/* if the address doesn't match the src address, it's an anomaly */
458 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
459 		(void)printf(" [addr=%s]",
460 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
461 
462 	return (tpn);
463 }
464 
465 static const struct atNBPtuple *
466 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
467 {
468 	register const char *cp = (const char *)tp + nbpTupleSize;
469 
470 	putchar(' ');
471 
472 	/* Object */
473 	putchar('"');
474 	if ((cp = print_cstring(cp, ep)) != NULL) {
475 		/* Type */
476 		putchar(':');
477 		if ((cp = print_cstring(cp, ep)) != NULL) {
478 			/* Zone */
479 			putchar('@');
480 			if ((cp = print_cstring(cp, ep)) != NULL)
481 				putchar('"');
482 		}
483 	}
484 	return ((const struct atNBPtuple *)cp);
485 }
486 
487 
488 #define HASHNAMESIZE 4096
489 
490 struct hnamemem {
491 	int addr;
492 	char *name;
493 	struct hnamemem *nxt;
494 };
495 
496 static struct hnamemem hnametable[HASHNAMESIZE];
497 
498 static const char *
499 ataddr_string(u_short atnet, u_char athost)
500 {
501 	register struct hnamemem *tp, *tp2;
502 	register int i = (atnet << 8) | athost;
503 	char nambuf[256];
504 	static int first = 1;
505 	FILE *fp;
506 
507 	/*
508 	 * if this is the first call, see if there's an AppleTalk
509 	 * number to name map file.
510 	 */
511 	if (first && (first = 0, !nflag)
512 	    && (fp = fopen("/etc/atalk.names", "r"))) {
513 		char line[256];
514 		int i1, i2;
515 
516 		while (fgets(line, sizeof(line), fp)) {
517 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
518 				continue;
519 			if (sscanf(line, "%d.%d %s", &i1, &i2, nambuf) == 3)
520 				/* got a hostname. */
521 				i2 |= (i1 << 8);
522 			else if (sscanf(line, "%d %s", &i1, nambuf) == 2)
523 				/* got a net name */
524 				i2 = (i1 << 8) | 255;
525 			else
526 				continue;
527 
528 			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
529 			     tp->nxt; tp = tp->nxt)
530 				;
531 			tp->addr = i2;
532 			tp->nxt = newhnamemem();
533 			tp->name = savestr(nambuf);
534 		}
535 		fclose(fp);
536 	}
537 
538 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
539 		if (tp->addr == i)
540 			return (tp->name);
541 
542 	/* didn't have the node name -- see if we've got the net name */
543 	i |= 255;
544 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
545 		if (tp2->addr == i) {
546 			tp->addr = (atnet << 8) | athost;
547 			tp->nxt = newhnamemem();
548 			(void)sprintf(nambuf, "%s.%d", tp2->name, athost);
549 			tp->name = savestr(nambuf);
550 			return (tp->name);
551 		}
552 
553 	tp->addr = (atnet << 8) | athost;
554 	tp->nxt = newhnamemem();
555 	if (athost != 255)
556 		(void)sprintf(nambuf, "%d.%d", atnet, athost);
557 	else
558 		(void)sprintf(nambuf, "%d", atnet);
559 	tp->name = savestr(nambuf);
560 
561 	return (tp->name);
562 }
563 
564 static struct tok skt2str[] = {
565 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
566 	{ nbpSkt,	"nis" },	/* name info socket */
567 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
568 	{ zipSkt,	"zip" },	/* zone info protocol */
569 	{ 0,		NULL }
570 };
571 
572 static const char *
573 ddpskt_string(register int skt)
574 {
575 	static char buf[8];
576 
577 	if (nflag) {
578 		(void)sprintf(buf, "%d", skt);
579 		return (buf);
580 	}
581 	return (tok2str(skt2str, "%d", skt));
582 }
583