xref: /freebsd-src/contrib/tcpdump/print-atalk.c (revision 2ebf6c05136945eb89ae7597c7daaf1e1cfa04e2) 
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: print-atalk.c,v 1.45 96/12/10 23:24:07 leres Exp $ (LBL)";
27 #endif
28 
29 #include <sys/param.h>
30 #include <sys/time.h>
31 #include <sys/socket.h>
32 
33 #if __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 <net/ethernet.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  */
97 void
98 atalk_print(register const u_char *bp, u_int length)
99 {
100 	register const struct LAP *lp;
101 	register const struct atDDP *dp;
102 	register const struct atShortDDP *sdp;
103 	u_short snet;
104 
105 #if 0
106 	lp = (struct LAP *)bp;
107 	bp += sizeof(*lp);
108 	length -= sizeof(*lp);
109 #else
110 	{
111 		static struct LAP lp_ = {0, 0, lapDDP};
112 		lp = &lp_;
113 	}
114 #endif
115 	switch (lp->type) {
116 
117 	case lapShortDDP:
118 		if (length < ddpSSize) {
119 			(void)printf(" [|sddp %d]", length);
120 			return;
121 		}
122 		sdp = (const struct atShortDDP *)bp;
123 		printf("%s.%s",
124 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
125 		printf(" > %s.%s:",
126 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
127 		bp += ddpSSize;
128 		length -= ddpSSize;
129 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
130 		break;
131 
132 	case lapDDP:
133 		if (length < ddpSize) {
134 			(void)printf(" [|ddp %d]", length);
135 			return;
136 		}
137 		dp = (const struct atDDP *)bp;
138 		snet = EXTRACT_16BITS(&dp->srcNet);
139 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
140 		    ddpskt_string(dp->srcSkt));
141 		printf(" > %s.%s:",
142 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
143 		    ddpskt_string(dp->dstSkt));
144 		bp += ddpSize;
145 		length -= ddpSize;
146 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
147 		break;
148 
149 #ifdef notdef
150 	case lapKLAP:
151 		klap_print(bp, length);
152 		break;
153 #endif
154 
155 	default:
156 		printf("%d > %d at-lap#%d %d",
157 		    lp->src, lp->dst, lp->type, length);
158 		break;
159 	}
160 }
161 
162 /* XXX should probably pass in the snap header and do checks like arp_print() */
163 void
164 aarp_print(register const u_char *bp, u_int length)
165 {
166 	register const struct aarp *ap;
167 
168 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
169 
170 	printf("aarp ");
171 	ap = (const struct aarp *)bp;
172 	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
173 	    ap->halen == 6 && ap->palen == 4 )
174 		switch (ntohs(ap->op)) {
175 
176 		case 1:				/* request */
177 			(void)printf("who-has %s tell %s",
178 			    AT(pdaddr), AT(psaddr));
179 			return;
180 
181 		case 2:				/* response */
182 			(void)printf("reply %s is-at %s",
183 			    AT(psaddr), etheraddr_string(ap->hsaddr));
184 			return;
185 
186 		case 3:				/* probe (oy!) */
187 			(void)printf("probe %s tell %s",
188 			    AT(pdaddr), AT(psaddr));
189 			return;
190 		}
191 	(void)printf("len %d op %d htype %d ptype %#x halen %d palen %d",
192 	    length, ap->op, ap->htype, ap->ptype, ap->halen, ap->palen );
193 }
194 
195 static void
196 ddp_print(register const u_char *bp, register u_int length, register int t,
197 	  register u_short snet, register u_char snode, u_char skt)
198 {
199 
200 	switch (t) {
201 
202 	case ddpNBP:
203 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
204 		break;
205 
206 	case ddpATP:
207 		atp_print((const struct atATP *)bp, length);
208 		break;
209 
210 	default:
211 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
212 		break;
213 	}
214 }
215 
216 static void
217 atp_print(register const struct atATP *ap, u_int length)
218 {
219 	char c;
220 	u_int32_t data;
221 
222 	if ((const u_char *)(ap + 1) > snapend) {
223 		/* Just bail if we don't have the whole chunk. */
224 		fputs(tstr, stdout);
225 		return;
226 	}
227 	length -= sizeof(*ap);
228 	switch (ap->control & 0xc0) {
229 
230 	case atpReqCode:
231 		(void)printf(" atp-req%s %d",
232 			     ap->control & atpXO? " " : "*",
233 			     EXTRACT_16BITS(&ap->transID));
234 
235 		atp_bitmap_print(ap->bitmap);
236 
237 		if (length != 0)
238 			(void)printf(" [len=%d]", length);
239 
240 		switch (ap->control & (atpEOM|atpSTS)) {
241 		case atpEOM:
242 			(void)printf(" [EOM]");
243 			break;
244 		case atpSTS:
245 			(void)printf(" [STS]");
246 			break;
247 		case atpEOM|atpSTS:
248 			(void)printf(" [EOM,STS]");
249 			break;
250 		}
251 		break;
252 
253 	case atpRspCode:
254 		(void)printf(" atp-resp%s%d:%d (%d)",
255 			     ap->control & atpEOM? "*" : " ",
256 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
257 		switch (ap->control & (atpXO|atpSTS)) {
258 		case atpXO:
259 			(void)printf(" [XO]");
260 			break;
261 		case atpSTS:
262 			(void)printf(" [STS]");
263 			break;
264 		case atpXO|atpSTS:
265 			(void)printf(" [XO,STS]");
266 			break;
267 		}
268 		break;
269 
270 	case atpRelCode:
271 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
272 
273 		atp_bitmap_print(ap->bitmap);
274 
275 		/* length should be zero */
276 		if (length)
277 			(void)printf(" [len=%d]", length);
278 
279 		/* there shouldn't be any control flags */
280 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
281 			c = '[';
282 			if (ap->control & atpXO) {
283 				(void)printf("%cXO", c);
284 				c = ',';
285 			}
286 			if (ap->control & atpEOM) {
287 				(void)printf("%cEOM", c);
288 				c = ',';
289 			}
290 			if (ap->control & atpSTS) {
291 				(void)printf("%cSTS", c);
292 				c = ',';
293 			}
294 			(void)printf("]");
295 		}
296 		break;
297 
298 	default:
299 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
300 			     EXTRACT_16BITS(&ap->transID), length);
301 		break;
302 	}
303 	data = EXTRACT_32BITS(&ap->userData);
304 	if (data != 0)
305 		(void)printf(" 0x%x", data);
306 }
307 
308 static void
309 atp_bitmap_print(register u_char bm)
310 {
311 	register char c;
312 	register int i;
313 
314 	/*
315 	 * The '& 0xff' below is needed for compilers that want to sign
316 	 * extend a u_char, which is the case with the Ultrix compiler.
317 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
318 	 */
319 	if ((bm + 1) & (bm & 0xff)) {
320 		c = '<';
321 		for (i = 0; bm; ++i) {
322 			if (bm & 1) {
323 				(void)printf("%c%d", c, i);
324 				c = ',';
325 			}
326 			bm >>= 1;
327 		}
328 		(void)printf(">");
329 	} else {
330 		for (i = 0; bm; ++i)
331 			bm >>= 1;
332 		if (i > 1)
333 			(void)printf("<0-%d>", i - 1);
334 		else
335 			(void)printf("<0>");
336 	}
337 }
338 
339 static void
340 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
341 	  register u_char snode, register u_char skt)
342 {
343 	register const struct atNBPtuple *tp =
344 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
345 	int i;
346 	const u_char *ep;
347 
348 	length -= nbpHeaderSize;
349 	if (length < 8) {
350 		/* must be room for at least one tuple */
351 		(void)printf(" truncated-nbp %d", length + nbpHeaderSize);
352 		return;
353 	}
354 	/* ep points to end of available data */
355 	ep = snapend;
356 	if ((const u_char *)tp > ep) {
357 		fputs(tstr, stdout);
358 		return;
359 	}
360 	switch (i = np->control & 0xf0) {
361 
362 	case nbpBrRq:
363 	case nbpLkUp:
364 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
365 			     np->id);
366 		if ((const u_char *)(tp + 1) > ep) {
367 			fputs(tstr, stdout);
368 			return;
369 		}
370 		(void)nbp_name_print(tp, ep);
371 		/*
372 		 * look for anomalies: the spec says there can only
373 		 * be one tuple, the address must match the source
374 		 * address and the enumerator should be zero.
375 		 */
376 		if ((np->control & 0xf) != 1)
377 			(void)printf(" [ntup=%d]", np->control & 0xf);
378 		if (tp->enumerator)
379 			(void)printf(" [enum=%d]", tp->enumerator);
380 		if (EXTRACT_16BITS(&tp->net) != snet ||
381 		    tp->node != snode || tp->skt != skt)
382 			(void)printf(" [addr=%s.%d]",
383 			    ataddr_string(EXTRACT_16BITS(&tp->net),
384 			    tp->node), tp->skt);
385 		break;
386 
387 	case nbpLkUpReply:
388 		(void)printf(" nbp-reply %d:", np->id);
389 
390 		/* print each of the tuples in the reply */
391 		for (i = np->control & 0xf; --i >= 0 && tp; )
392 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
393 		break;
394 
395 	default:
396 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
397 				length);
398 		break;
399 	}
400 }
401 
402 /* print a counted string */
403 static const char *
404 print_cstring(register const char *cp, register const u_char *ep)
405 {
406 	register u_int length;
407 
408 	if (cp >= (const char *)ep) {
409 		fputs(tstr, stdout);
410 		return (0);
411 	}
412 	length = *cp++;
413 
414 	/* Spec says string can be at most 32 bytes long */
415 	if (length < 0 || length > 32) {
416 		(void)printf("[len=%d]", length);
417 		return (0);
418 	}
419 	while (--length >= 0) {
420 		if (cp >= (char *)ep) {
421 			fputs(tstr, stdout);
422 			return (0);
423 		}
424 		putchar(*cp++);
425 	}
426 	return (cp);
427 }
428 
429 static const struct atNBPtuple *
430 nbp_tuple_print(register const struct atNBPtuple *tp,
431 		register const u_char *ep,
432 		register u_short snet, register u_char snode,
433 		register u_char skt)
434 {
435 	register const struct atNBPtuple *tpn;
436 
437 	if ((const u_char *)(tp + 1) > ep) {
438 		fputs(tstr, stdout);
439 		return 0;
440 	}
441 	tpn = nbp_name_print(tp, ep);
442 
443 	/* if the enumerator isn't 1, print it */
444 	if (tp->enumerator != 1)
445 		(void)printf("(%d)", tp->enumerator);
446 
447 	/* if the socket doesn't match the src socket, print it */
448 	if (tp->skt != skt)
449 		(void)printf(" %d", tp->skt);
450 
451 	/* if the address doesn't match the src address, it's an anomaly */
452 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
453 		(void)printf(" [addr=%s]",
454 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
455 
456 	return (tpn);
457 }
458 
459 static const struct atNBPtuple *
460 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
461 {
462 	register const char *cp = (const char *)tp + nbpTupleSize;
463 
464 	putchar(' ');
465 
466 	/* Object */
467 	putchar('"');
468 	if ((cp = print_cstring(cp, ep)) != NULL) {
469 		/* Type */
470 		putchar(':');
471 		if ((cp = print_cstring(cp, ep)) != NULL) {
472 			/* Zone */
473 			putchar('@');
474 			if ((cp = print_cstring(cp, ep)) != NULL)
475 				putchar('"');
476 		}
477 	}
478 	return ((const struct atNBPtuple *)cp);
479 }
480 
481 
482 #define HASHNAMESIZE 4096
483 
484 struct hnamemem {
485 	int addr;
486 	char *name;
487 	struct hnamemem *nxt;
488 };
489 
490 static struct hnamemem hnametable[HASHNAMESIZE];
491 
492 static const char *
493 ataddr_string(u_short atnet, u_char athost)
494 {
495 	register struct hnamemem *tp, *tp2;
496 	register int i = (atnet << 8) | athost;
497 	char nambuf[256];
498 	static int first = 1;
499 	FILE *fp;
500 
501 	/*
502 	 * if this is the first call, see if there's an AppleTalk
503 	 * number to name map file.
504 	 */
505 	if (first && (first = 0, !nflag)
506 	    && (fp = fopen("/etc/atalk.names", "r"))) {
507 		char line[256];
508 		int i1, i2;
509 
510 		while (fgets(line, sizeof(line), fp)) {
511 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
512 				continue;
513 			if (sscanf(line, "%d.%d %s", &i1, &i2, nambuf) == 3)
514 				/* got a hostname. */
515 				i2 |= (i1 << 8);
516 			else if (sscanf(line, "%d %s", &i1, nambuf) == 2)
517 				/* got a net name */
518 				i2 = (i1 << 8) | 255;
519 			else
520 				continue;
521 
522 			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
523 			     tp->nxt; tp = tp->nxt)
524 				;
525 			tp->addr = i2;
526 			tp->nxt = newhnamemem();
527 			tp->name = savestr(nambuf);
528 		}
529 		fclose(fp);
530 	}
531 
532 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
533 		if (tp->addr == i)
534 			return (tp->name);
535 
536 	/* didn't have the node name -- see if we've got the net name */
537 	i |= 255;
538 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
539 		if (tp2->addr == i) {
540 			tp->addr = (atnet << 8) | athost;
541 			tp->nxt = newhnamemem();
542 			(void)sprintf(nambuf, "%s.%d", tp2->name, athost);
543 			tp->name = savestr(nambuf);
544 			return (tp->name);
545 		}
546 
547 	tp->addr = (atnet << 8) | athost;
548 	tp->nxt = newhnamemem();
549 	if (athost != 255)
550 		(void)sprintf(nambuf, "%d.%d", atnet, athost);
551 	else
552 		(void)sprintf(nambuf, "%d", atnet);
553 	tp->name = savestr(nambuf);
554 
555 	return (tp->name);
556 }
557 
558 static struct tok skt2str[] = {
559 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
560 	{ nbpSkt,	"nis" },	/* name info socket */
561 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
562 	{ zipSkt,	"zip" },	/* zone info protocol */
563 	{ 0,		NULL }
564 };
565 
566 static const char *
567 ddpskt_string(register int skt)
568 {
569 	static char buf[8];
570 
571 	if (nflag) {
572 		(void)sprintf(buf, "%d", skt);
573 		return (buf);
574 	}
575 	return (tok2str(skt2str, "%d", skt));
576 }
577