xref: /freebsd/contrib/tcpdump/print-atalk.c (revision e627b39baccd1ec9129690167cf5e6d860509655) 
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 #ifndef lint
24 static  char rcsid[] =
25 	"@(#)$Header: print-atalk.c,v 1.43 96/07/23 14:16:55 leres Exp $ (LBL)";
26 #endif
27 
28 #include <sys/param.h>
29 #include <sys/time.h>
30 #include <sys/socket.h>
31 
32 #if __STDC__
33 struct mbuf;
34 struct rtentry;
35 #endif
36 #include <net/if.h>
37 
38 #include <netinet/in.h>
39 #include <netinet/in_systm.h>
40 #include <netinet/ip.h>
41 #include <netinet/ip_var.h>
42 #include <netinet/if_ether.h>
43 #include <netinet/udp.h>
44 #include <netinet/udp_var.h>
45 #include <netinet/tcp.h>
46 #include <netinet/tcpip.h>
47 
48 #include <stdio.h>
49 #include <stdlib.h>
50 #include <string.h>
51 
52 #include "interface.h"
53 #include "addrtoname.h"
54 #include "ethertype.h"
55 #include "extract.h"			/* must come after interface.h */
56 #include "appletalk.h"
57 
58 static struct tok type2str[] = {
59 	{ ddpRTMP,		"rtmp" },
60 	{ ddpRTMPrequest,	"rtmpReq" },
61 	{ ddpECHO,		"echo" },
62 	{ ddpIP,		"IP" },
63 	{ ddpARP,		"ARP" },
64 	{ ddpKLAP,		"KLAP" },
65 	{ 0,			NULL }
66 };
67 
68 struct aarp {
69 	u_short htype, ptype;
70 	u_char	halen, palen;
71 	u_short op;
72 	u_char	hsaddr[6];
73 	u_char	psaddr[4];
74 	u_char	hdaddr[6];
75 	u_char	pdaddr[4];
76 };
77 
78 static char tstr[] = "[|atalk]";
79 
80 static void atp_print(const struct atATP *, u_int);
81 static void atp_bitmap_print(u_char);
82 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
83 static const char *print_cstring(const char *, const u_char *);
84 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
85 						const u_char *,
86 						u_short, u_char, u_char);
87 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
88 					       const u_char *);
89 static const char *ataddr_string(u_short, u_char);
90 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
91 static const char *ddpskt_string(int);
92 
93 /*
94  * Print AppleTalk Datagram Delivery Protocol packets.
95  */
96 void
97 atalk_print(register const u_char *bp, u_int length)
98 {
99 	register const struct LAP *lp;
100 	register const struct atDDP *dp;
101 	register const struct atShortDDP *sdp;
102 	u_short snet;
103 
104 #if 0
105 	lp = (struct LAP *)bp;
106 	bp += sizeof(*lp);
107 	length -= sizeof(*lp);
108 #else
109 	{
110 		static struct LAP lp_ = {0, 0, lapDDP};
111 		lp = &lp_;
112 	}
113 #endif
114 	switch (lp->type) {
115 
116 	case lapShortDDP:
117 		if (length < ddpSSize) {
118 			(void)printf(" [|sddp %d]", length);
119 			return;
120 		}
121 		sdp = (const struct atShortDDP *)bp;
122 		printf("%s.%s",
123 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
124 		printf(" > %s.%s:",
125 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
126 		bp += ddpSSize;
127 		length -= ddpSSize;
128 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
129 		break;
130 
131 	case lapDDP:
132 		if (length < ddpSize) {
133 			(void)printf(" [|ddp %d]", length);
134 			return;
135 		}
136 		dp = (const struct atDDP *)bp;
137 		snet = EXTRACT_16BITS(&dp->srcNet);
138 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
139 		    ddpskt_string(dp->srcSkt));
140 		printf(" > %s.%s:",
141 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
142 		    ddpskt_string(dp->dstSkt));
143 		bp += ddpSize;
144 		length -= ddpSize;
145 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
146 		break;
147 
148 #ifdef notdef
149 	case lapKLAP:
150 		klap_print(bp, length);
151 		break;
152 #endif
153 
154 	default:
155 		printf("%d > %d at-lap#%d %d",
156 		    lp->src, lp->dst, lp->type, length);
157 		break;
158 	}
159 }
160 
161 /* XXX should probably pass in the snap header and do checks like arp_print() */
162 void
163 aarp_print(register const u_char *bp, u_int length)
164 {
165 	register const struct aarp *ap;
166 
167 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
168 
169 	printf("aarp ");
170 	ap = (const struct aarp *)bp;
171 	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
172 	    ap->halen == 6 && ap->palen == 4 )
173 		switch (ntohs(ap->op)) {
174 
175 		case 1:				/* request */
176 			(void)printf("who-has %s tell %s",
177 			    AT(pdaddr), AT(psaddr));
178 			return;
179 
180 		case 2:				/* response */
181 			(void)printf("reply %s is-at %s",
182 			    AT(psaddr), etheraddr_string(ap->hsaddr));
183 			return;
184 
185 		case 3:				/* probe (oy!) */
186 			(void)printf("probe %s tell %s",
187 			    AT(pdaddr), AT(psaddr));
188 			return;
189 		}
190 	(void)printf("len %d op %d htype %d ptype %#x halen %d palen %d",
191 	    length, ap->op, ap->htype, ap->ptype, ap->halen, ap->palen );
192 }
193 
194 static void
195 ddp_print(register const u_char *bp, register u_int length, register int t,
196 	  register u_short snet, register u_char snode, u_char skt)
197 {
198 
199 	switch (t) {
200 
201 	case ddpNBP:
202 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
203 		break;
204 
205 	case ddpATP:
206 		atp_print((const struct atATP *)bp, length);
207 		break;
208 
209 	default:
210 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
211 		break;
212 	}
213 }
214 
215 static void
216 atp_print(register const struct atATP *ap, u_int length)
217 {
218 	char c;
219 	u_int32_t data;
220 
221 	if ((const u_char *)(ap + 1) > snapend) {
222 		/* Just bail if we don't have the whole chunk. */
223 		fputs(tstr, stdout);
224 		return;
225 	}
226 	length -= sizeof(*ap);
227 	switch (ap->control & 0xc0) {
228 
229 	case atpReqCode:
230 		(void)printf(" atp-req%s %d",
231 			     ap->control & atpXO? " " : "*",
232 			     EXTRACT_16BITS(&ap->transID));
233 
234 		atp_bitmap_print(ap->bitmap);
235 
236 		if (length != 0)
237 			(void)printf(" [len=%d]", length);
238 
239 		switch (ap->control & (atpEOM|atpSTS)) {
240 		case atpEOM:
241 			(void)printf(" [EOM]");
242 			break;
243 		case atpSTS:
244 			(void)printf(" [STS]");
245 			break;
246 		case atpEOM|atpSTS:
247 			(void)printf(" [EOM,STS]");
248 			break;
249 		}
250 		break;
251 
252 	case atpRspCode:
253 		(void)printf(" atp-resp%s%d:%d (%d)",
254 			     ap->control & atpEOM? "*" : " ",
255 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
256 		switch (ap->control & (atpXO|atpSTS)) {
257 		case atpXO:
258 			(void)printf(" [XO]");
259 			break;
260 		case atpSTS:
261 			(void)printf(" [STS]");
262 			break;
263 		case atpXO|atpSTS:
264 			(void)printf(" [XO,STS]");
265 			break;
266 		}
267 		break;
268 
269 	case atpRelCode:
270 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
271 
272 		atp_bitmap_print(ap->bitmap);
273 
274 		/* length should be zero */
275 		if (length)
276 			(void)printf(" [len=%d]", length);
277 
278 		/* there shouldn't be any control flags */
279 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
280 			c = '[';
281 			if (ap->control & atpXO) {
282 				(void)printf("%cXO", c);
283 				c = ',';
284 			}
285 			if (ap->control & atpEOM) {
286 				(void)printf("%cEOM", c);
287 				c = ',';
288 			}
289 			if (ap->control & atpSTS) {
290 				(void)printf("%cSTS", c);
291 				c = ',';
292 			}
293 			(void)printf("]");
294 		}
295 		break;
296 
297 	default:
298 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
299 			     EXTRACT_16BITS(&ap->transID), length);
300 		break;
301 	}
302 	data = EXTRACT_32BITS(&ap->userData);
303 	if (data != 0)
304 		(void)printf(" 0x%x", data);
305 }
306 
307 static void
308 atp_bitmap_print(register u_char bm)
309 {
310 	register char c;
311 	register int i;
312 
313 	/*
314 	 * The '& 0xff' below is needed for compilers that want to sign
315 	 * extend a u_char, which is the case with the Ultrix compiler.
316 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
317 	 */
318 	if ((bm + 1) & (bm & 0xff)) {
319 		c = '<';
320 		for (i = 0; bm; ++i) {
321 			if (bm & 1) {
322 				(void)printf("%c%d", c, i);
323 				c = ',';
324 			}
325 			bm >>= 1;
326 		}
327 		(void)printf(">");
328 	} else {
329 		for (i = 0; bm; ++i)
330 			bm >>= 1;
331 		if (i > 1)
332 			(void)printf("<0-%d>", i - 1);
333 		else
334 			(void)printf("<0>");
335 	}
336 }
337 
338 static void
339 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
340 	  register u_char snode, register u_char skt)
341 {
342 	register const struct atNBPtuple *tp =
343 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
344 	int i;
345 	const u_char *ep;
346 
347 	length -= nbpHeaderSize;
348 	if (length < 8) {
349 		/* must be room for at least one tuple */
350 		(void)printf(" truncated-nbp %d", length + nbpHeaderSize);
351 		return;
352 	}
353 	/* ep points to end of available data */
354 	ep = snapend;
355 	if ((const u_char *)tp > ep) {
356 		fputs(tstr, stdout);
357 		return;
358 	}
359 	switch (i = np->control & 0xf0) {
360 
361 	case nbpBrRq:
362 	case nbpLkUp:
363 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
364 			     np->id);
365 		if ((const u_char *)(tp + 1) > ep) {
366 			fputs(tstr, stdout);
367 			return;
368 		}
369 		(void)nbp_name_print(tp, ep);
370 		/*
371 		 * look for anomalies: the spec says there can only
372 		 * be one tuple, the address must match the source
373 		 * address and the enumerator should be zero.
374 		 */
375 		if ((np->control & 0xf) != 1)
376 			(void)printf(" [ntup=%d]", np->control & 0xf);
377 		if (tp->enumerator)
378 			(void)printf(" [enum=%d]", tp->enumerator);
379 		if (EXTRACT_16BITS(&tp->net) != snet ||
380 		    tp->node != snode || tp->skt != skt)
381 			(void)printf(" [addr=%s.%d]",
382 			    ataddr_string(EXTRACT_16BITS(&tp->net),
383 			    tp->node), tp->skt);
384 		break;
385 
386 	case nbpLkUpReply:
387 		(void)printf(" nbp-reply %d:", np->id);
388 
389 		/* print each of the tuples in the reply */
390 		for (i = np->control & 0xf; --i >= 0 && tp; )
391 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
392 		break;
393 
394 	default:
395 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
396 				length);
397 		break;
398 	}
399 }
400 
401 /* print a counted string */
402 static const char *
403 print_cstring(register const char *cp, register const u_char *ep)
404 {
405 	register u_int length;
406 
407 	if (cp >= (const char *)ep) {
408 		fputs(tstr, stdout);
409 		return (0);
410 	}
411 	length = *cp++;
412 
413 	/* Spec says string can be at most 32 bytes long */
414 	if (length < 0 || length > 32) {
415 		(void)printf("[len=%d]", length);
416 		return (0);
417 	}
418 	while (--length >= 0) {
419 		if (cp >= (char *)ep) {
420 			fputs(tstr, stdout);
421 			return (0);
422 		}
423 		putchar(*cp++);
424 	}
425 	return (cp);
426 }
427 
428 static const struct atNBPtuple *
429 nbp_tuple_print(register const struct atNBPtuple *tp,
430 		register const u_char *ep,
431 		register u_short snet, register u_char snode,
432 		register u_char skt)
433 {
434 	register const struct atNBPtuple *tpn;
435 
436 	if ((const u_char *)(tp + 1) > ep) {
437 		fputs(tstr, stdout);
438 		return 0;
439 	}
440 	tpn = nbp_name_print(tp, ep);
441 
442 	/* if the enumerator isn't 1, print it */
443 	if (tp->enumerator != 1)
444 		(void)printf("(%d)", tp->enumerator);
445 
446 	/* if the socket doesn't match the src socket, print it */
447 	if (tp->skt != skt)
448 		(void)printf(" %d", tp->skt);
449 
450 	/* if the address doesn't match the src address, it's an anomaly */
451 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
452 		(void)printf(" [addr=%s]",
453 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
454 
455 	return (tpn);
456 }
457 
458 static const struct atNBPtuple *
459 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
460 {
461 	register const char *cp = (const char *)tp + nbpTupleSize;
462 
463 	putchar(' ');
464 
465 	/* Object */
466 	putchar('"');
467 	if ((cp = print_cstring(cp, ep)) != NULL) {
468 		/* Type */
469 		putchar(':');
470 		if ((cp = print_cstring(cp, ep)) != NULL) {
471 			/* Zone */
472 			putchar('@');
473 			if ((cp = print_cstring(cp, ep)) != NULL)
474 				putchar('"');
475 		}
476 	}
477 	return ((const struct atNBPtuple *)cp);
478 }
479 
480 
481 #define HASHNAMESIZE 4096
482 
483 struct hnamemem {
484 	int addr;
485 	char *name;
486 	struct hnamemem *nxt;
487 };
488 
489 static struct hnamemem hnametable[HASHNAMESIZE];
490 
491 static const char *
492 ataddr_string(u_short atnet, u_char athost)
493 {
494 	register struct hnamemem *tp, *tp2;
495 	register int i = (atnet << 8) | athost;
496 	char nambuf[256];
497 	static int first = 1;
498 	FILE *fp;
499 
500 	/*
501 	 * if this is the first call, see if there's an AppleTalk
502 	 * number to name map file.
503 	 */
504 	if (first && (first = 0, !nflag)
505 	    && (fp = fopen("/etc/atalk.names", "r"))) {
506 		char line[256];
507 		int i1, i2;
508 
509 		while (fgets(line, sizeof(line), fp)) {
510 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
511 				continue;
512 			if (sscanf(line, "%d.%d %s", &i1, &i2, nambuf) == 3)
513 				/* got a hostname. */
514 				i2 |= (i1 << 8);
515 			else if (sscanf(line, "%d %s", &i1, nambuf) == 2)
516 				/* got a net name */
517 				i2 = (i1 << 8) | 255;
518 			else
519 				continue;
520 
521 			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
522 			     tp->nxt; tp = tp->nxt)
523 				;
524 			tp->addr = i2;
525 			tp->nxt = newhnamemem();
526 			tp->name = savestr(nambuf);
527 		}
528 		fclose(fp);
529 	}
530 
531 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
532 		if (tp->addr == i)
533 			return (tp->name);
534 
535 	/* didn't have the node name -- see if we've got the net name */
536 	i |= 255;
537 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
538 		if (tp2->addr == i) {
539 			tp->addr = (atnet << 8) | athost;
540 			tp->nxt = newhnamemem();
541 			(void)sprintf(nambuf, "%s.%d", tp2->name, athost);
542 			tp->name = savestr(nambuf);
543 			return (tp->name);
544 		}
545 
546 	tp->addr = (atnet << 8) | athost;
547 	tp->nxt = newhnamemem();
548 	if (athost != 255)
549 		(void)sprintf(nambuf, "%d.%d", atnet, athost);
550 	else
551 		(void)sprintf(nambuf, "%d", atnet);
552 	tp->name = savestr(nambuf);
553 
554 	return (tp->name);
555 }
556 
557 static struct tok skt2str[] = {
558 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
559 	{ nbpSkt,	"nis" },	/* name info socket */
560 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
561 	{ zipSkt,	"zip" },	/* zone info protocol */
562 	{ 0,		NULL }
563 };
564 
565 static const char *
566 ddpskt_string(register int skt)
567 {
568 	static char buf[8];
569 
570 	if (nflag) {
571 		(void)sprintf(buf, "%d", skt);
572 		return (buf);
573 	}
574 	return (tok2str(skt2str, "%d", skt));
575 }
576