xref: /freebsd/contrib/tcpdump/print-atalk.c (revision 4cf49a43559ed9fdad601bdcccd2c55963008675) 
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 
24 #ifndef lint
25 static const char rcsid[] =
26     "@(#) $Header: print-atalk.c,v 1.48 97/05/28 12:50:58 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 #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_short htype, ptype;
72 	u_char	halen, palen;
73 	u_short op;
74 	u_char	hsaddr[6];
75 	u_char	psaddr[4];
76 	u_char	hdaddr[6];
77 	u_char	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  */
98 void
99 atalk_print(register const u_char *bp, u_int length)
100 {
101 	register const struct LAP *lp;
102 	register const struct atDDP *dp;
103 	register const struct atShortDDP *sdp;
104 	u_short snet;
105 
106 #if 0
107 	lp = (struct LAP *)bp;
108 	bp += sizeof(*lp);
109 	length -= sizeof(*lp);
110 #else
111 	{
112 		static struct LAP lp_ = {0, 0, lapDDP};
113 		lp = &lp_;
114 	}
115 #endif
116 	switch (lp->type) {
117 
118 	case lapShortDDP:
119 		if (length < ddpSSize) {
120 			(void)printf(" [|sddp %d]", length);
121 			return;
122 		}
123 		sdp = (const struct atShortDDP *)bp;
124 		printf("%s.%s",
125 		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
126 		printf(" > %s.%s:",
127 		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
128 		bp += ddpSSize;
129 		length -= ddpSSize;
130 		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
131 		break;
132 
133 	case lapDDP:
134 		if (length < ddpSize) {
135 			(void)printf(" [|ddp %d]", length);
136 			return;
137 		}
138 		dp = (const struct atDDP *)bp;
139 		snet = EXTRACT_16BITS(&dp->srcNet);
140 		printf("%s.%s", ataddr_string(snet, dp->srcNode),
141 		    ddpskt_string(dp->srcSkt));
142 		printf(" > %s.%s:",
143 		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
144 		    ddpskt_string(dp->dstSkt));
145 		bp += ddpSize;
146 		length -= ddpSize;
147 		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
148 		break;
149 
150 #ifdef notdef
151 	case lapKLAP:
152 		klap_print(bp, length);
153 		break;
154 #endif
155 
156 	default:
157 		printf("%d > %d at-lap#%d %d",
158 		    lp->src, lp->dst, lp->type, length);
159 		break;
160 	}
161 }
162 
163 /* XXX should probably pass in the snap header and do checks like arp_print() */
164 void
165 aarp_print(register const u_char *bp, u_int length)
166 {
167 	register const struct aarp *ap;
168 
169 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
170 
171 	printf("aarp ");
172 	ap = (const struct aarp *)bp;
173 	if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
174 	    ap->halen == 6 && ap->palen == 4 )
175 		switch (ntohs(ap->op)) {
176 
177 		case 1:				/* request */
178 			(void)printf("who-has %s tell %s",
179 			    AT(pdaddr), AT(psaddr));
180 			return;
181 
182 		case 2:				/* response */
183 			(void)printf("reply %s is-at %s",
184 			    AT(psaddr), etheraddr_string(ap->hsaddr));
185 			return;
186 
187 		case 3:				/* probe (oy!) */
188 			(void)printf("probe %s tell %s",
189 			    AT(pdaddr), AT(psaddr));
190 			return;
191 		}
192 	(void)printf("len %d op %d htype %d ptype %#x halen %d palen %d",
193 	    length, ap->op, ap->htype, ap->ptype, ap->halen, ap->palen );
194 }
195 
196 static void
197 ddp_print(register const u_char *bp, register u_int length, register int t,
198 	  register u_short snet, register u_char snode, u_char skt)
199 {
200 
201 	switch (t) {
202 
203 	case ddpNBP:
204 		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
205 		break;
206 
207 	case ddpATP:
208 		atp_print((const struct atATP *)bp, length);
209 		break;
210 
211 	default:
212 		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
213 		break;
214 	}
215 }
216 
217 static void
218 atp_print(register const struct atATP *ap, u_int length)
219 {
220 	char c;
221 	u_int32_t data;
222 
223 	if ((const u_char *)(ap + 1) > snapend) {
224 		/* Just bail if we don't have the whole chunk. */
225 		fputs(tstr, stdout);
226 		return;
227 	}
228 	length -= sizeof(*ap);
229 	switch (ap->control & 0xc0) {
230 
231 	case atpReqCode:
232 		(void)printf(" atp-req%s %d",
233 			     ap->control & atpXO? " " : "*",
234 			     EXTRACT_16BITS(&ap->transID));
235 
236 		atp_bitmap_print(ap->bitmap);
237 
238 		if (length != 0)
239 			(void)printf(" [len=%d]", length);
240 
241 		switch (ap->control & (atpEOM|atpSTS)) {
242 		case atpEOM:
243 			(void)printf(" [EOM]");
244 			break;
245 		case atpSTS:
246 			(void)printf(" [STS]");
247 			break;
248 		case atpEOM|atpSTS:
249 			(void)printf(" [EOM,STS]");
250 			break;
251 		}
252 		break;
253 
254 	case atpRspCode:
255 		(void)printf(" atp-resp%s%d:%d (%d)",
256 			     ap->control & atpEOM? "*" : " ",
257 			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
258 		switch (ap->control & (atpXO|atpSTS)) {
259 		case atpXO:
260 			(void)printf(" [XO]");
261 			break;
262 		case atpSTS:
263 			(void)printf(" [STS]");
264 			break;
265 		case atpXO|atpSTS:
266 			(void)printf(" [XO,STS]");
267 			break;
268 		}
269 		break;
270 
271 	case atpRelCode:
272 		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
273 
274 		atp_bitmap_print(ap->bitmap);
275 
276 		/* length should be zero */
277 		if (length)
278 			(void)printf(" [len=%d]", length);
279 
280 		/* there shouldn't be any control flags */
281 		if (ap->control & (atpXO|atpEOM|atpSTS)) {
282 			c = '[';
283 			if (ap->control & atpXO) {
284 				(void)printf("%cXO", c);
285 				c = ',';
286 			}
287 			if (ap->control & atpEOM) {
288 				(void)printf("%cEOM", c);
289 				c = ',';
290 			}
291 			if (ap->control & atpSTS) {
292 				(void)printf("%cSTS", c);
293 				c = ',';
294 			}
295 			(void)printf("]");
296 		}
297 		break;
298 
299 	default:
300 		(void)printf(" atp-0x%x  %d (%d)", ap->control,
301 			     EXTRACT_16BITS(&ap->transID), length);
302 		break;
303 	}
304 	data = EXTRACT_32BITS(&ap->userData);
305 	if (data != 0)
306 		(void)printf(" 0x%x", data);
307 }
308 
309 static void
310 atp_bitmap_print(register u_char bm)
311 {
312 	register char c;
313 	register int i;
314 
315 	/*
316 	 * The '& 0xff' below is needed for compilers that want to sign
317 	 * extend a u_char, which is the case with the Ultrix compiler.
318 	 * (gcc is smart enough to eliminate it, at least on the Sparc).
319 	 */
320 	if ((bm + 1) & (bm & 0xff)) {
321 		c = '<';
322 		for (i = 0; bm; ++i) {
323 			if (bm & 1) {
324 				(void)printf("%c%d", c, i);
325 				c = ',';
326 			}
327 			bm >>= 1;
328 		}
329 		(void)printf(">");
330 	} else {
331 		for (i = 0; bm; ++i)
332 			bm >>= 1;
333 		if (i > 1)
334 			(void)printf("<0-%d>", i - 1);
335 		else
336 			(void)printf("<0>");
337 	}
338 }
339 
340 static void
341 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
342 	  register u_char snode, register u_char skt)
343 {
344 	register const struct atNBPtuple *tp =
345 			(struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
346 	int i;
347 	const u_char *ep;
348 
349 	length -= nbpHeaderSize;
350 	if (length < 8) {
351 		/* must be room for at least one tuple */
352 		(void)printf(" truncated-nbp %d", length + nbpHeaderSize);
353 		return;
354 	}
355 	/* ep points to end of available data */
356 	ep = snapend;
357 	if ((const u_char *)tp > ep) {
358 		fputs(tstr, stdout);
359 		return;
360 	}
361 	switch (i = np->control & 0xf0) {
362 
363 	case nbpBrRq:
364 	case nbpLkUp:
365 		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
366 			     np->id);
367 		if ((const u_char *)(tp + 1) > ep) {
368 			fputs(tstr, stdout);
369 			return;
370 		}
371 		(void)nbp_name_print(tp, ep);
372 		/*
373 		 * look for anomalies: the spec says there can only
374 		 * be one tuple, the address must match the source
375 		 * address and the enumerator should be zero.
376 		 */
377 		if ((np->control & 0xf) != 1)
378 			(void)printf(" [ntup=%d]", np->control & 0xf);
379 		if (tp->enumerator)
380 			(void)printf(" [enum=%d]", tp->enumerator);
381 		if (EXTRACT_16BITS(&tp->net) != snet ||
382 		    tp->node != snode || tp->skt != skt)
383 			(void)printf(" [addr=%s.%d]",
384 			    ataddr_string(EXTRACT_16BITS(&tp->net),
385 			    tp->node), tp->skt);
386 		break;
387 
388 	case nbpLkUpReply:
389 		(void)printf(" nbp-reply %d:", np->id);
390 
391 		/* print each of the tuples in the reply */
392 		for (i = np->control & 0xf; --i >= 0 && tp; )
393 			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
394 		break;
395 
396 	default:
397 		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
398 				length);
399 		break;
400 	}
401 }
402 
403 /* print a counted string */
404 static const char *
405 print_cstring(register const char *cp, register const u_char *ep)
406 {
407 	register u_int length;
408 
409 	if (cp >= (const char *)ep) {
410 		fputs(tstr, stdout);
411 		return (0);
412 	}
413 	length = *cp++;
414 
415 	/* Spec says string can be at most 32 bytes long */
416 	if (length > 32) {
417 		(void)printf("[len=%u]", length);
418 		return (0);
419 	}
420 	while ((int)--length >= 0) {
421 		if (cp >= (char *)ep) {
422 			fputs(tstr, stdout);
423 			return (0);
424 		}
425 		putchar(*cp++);
426 	}
427 	return (cp);
428 }
429 
430 static const struct atNBPtuple *
431 nbp_tuple_print(register const struct atNBPtuple *tp,
432 		register const u_char *ep,
433 		register u_short snet, register u_char snode,
434 		register u_char skt)
435 {
436 	register const struct atNBPtuple *tpn;
437 
438 	if ((const u_char *)(tp + 1) > ep) {
439 		fputs(tstr, stdout);
440 		return 0;
441 	}
442 	tpn = nbp_name_print(tp, ep);
443 
444 	/* if the enumerator isn't 1, print it */
445 	if (tp->enumerator != 1)
446 		(void)printf("(%d)", tp->enumerator);
447 
448 	/* if the socket doesn't match the src socket, print it */
449 	if (tp->skt != skt)
450 		(void)printf(" %d", tp->skt);
451 
452 	/* if the address doesn't match the src address, it's an anomaly */
453 	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
454 		(void)printf(" [addr=%s]",
455 		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
456 
457 	return (tpn);
458 }
459 
460 static const struct atNBPtuple *
461 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
462 {
463 	register const char *cp = (const char *)tp + nbpTupleSize;
464 
465 	putchar(' ');
466 
467 	/* Object */
468 	putchar('"');
469 	if ((cp = print_cstring(cp, ep)) != NULL) {
470 		/* Type */
471 		putchar(':');
472 		if ((cp = print_cstring(cp, ep)) != NULL) {
473 			/* Zone */
474 			putchar('@');
475 			if ((cp = print_cstring(cp, ep)) != NULL)
476 				putchar('"');
477 		}
478 	}
479 	return ((const struct atNBPtuple *)cp);
480 }
481 
482 
483 #define HASHNAMESIZE 4096
484 
485 struct hnamemem {
486 	int addr;
487 	char *name;
488 	struct hnamemem *nxt;
489 };
490 
491 static struct hnamemem hnametable[HASHNAMESIZE];
492 
493 static const char *
494 ataddr_string(u_short atnet, u_char athost)
495 {
496 	register struct hnamemem *tp, *tp2;
497 	register int i = (atnet << 8) | athost;
498 	char nambuf[256];
499 	static int first = 1;
500 	FILE *fp;
501 
502 	/*
503 	 * if this is the first call, see if there's an AppleTalk
504 	 * number to name map file.
505 	 */
506 	if (first && (first = 0, !nflag)
507 	    && (fp = fopen("/etc/atalk.names", "r"))) {
508 		char line[256];
509 		int i1, i2;
510 
511 		while (fgets(line, sizeof(line), fp)) {
512 			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
513 				continue;
514 			if (sscanf(line, "%d.%d %s", &i1, &i2, nambuf) == 3)
515 				/* got a hostname. */
516 				i2 |= (i1 << 8);
517 			else if (sscanf(line, "%d %s", &i1, nambuf) == 2)
518 				/* got a net name */
519 				i2 = (i1 << 8) | 255;
520 			else
521 				continue;
522 
523 			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
524 			     tp->nxt; tp = tp->nxt)
525 				;
526 			tp->addr = i2;
527 			tp->nxt = newhnamemem();
528 			tp->name = savestr(nambuf);
529 		}
530 		fclose(fp);
531 	}
532 
533 	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
534 		if (tp->addr == i)
535 			return (tp->name);
536 
537 	/* didn't have the node name -- see if we've got the net name */
538 	i |= 255;
539 	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
540 		if (tp2->addr == i) {
541 			tp->addr = (atnet << 8) | athost;
542 			tp->nxt = newhnamemem();
543 			(void)sprintf(nambuf, "%s.%d", tp2->name, athost);
544 			tp->name = savestr(nambuf);
545 			return (tp->name);
546 		}
547 
548 	tp->addr = (atnet << 8) | athost;
549 	tp->nxt = newhnamemem();
550 	if (athost != 255)
551 		(void)sprintf(nambuf, "%d.%d", atnet, athost);
552 	else
553 		(void)sprintf(nambuf, "%d", atnet);
554 	tp->name = savestr(nambuf);
555 
556 	return (tp->name);
557 }
558 
559 static struct tok skt2str[] = {
560 	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
561 	{ nbpSkt,	"nis" },	/* name info socket */
562 	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
563 	{ zipSkt,	"zip" },	/* zone info protocol */
564 	{ 0,		NULL }
565 };
566 
567 static const char *
568 ddpskt_string(register int skt)
569 {
570 	static char buf[8];
571 
572 	if (nflag) {
573 		(void)sprintf(buf, "%d", skt);
574 		return (buf);
575 	}
576 	return (tok2str(skt2str, "%d", skt));
577 }
578