print-atalk.c revision 190207 
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: head/contrib/tcpdump/print-atalk.c 190207 2009-03-21 18:30:25Z rpaulo $
24 */
25
26#ifndef lint
27static const char rcsid[] _U_ =
28    "@(#) $Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.81 2004-05-01 09:41:50 hannes Exp $ (LBL)";
29#endif
30
31#ifdef HAVE_CONFIG_H
32#include "config.h"
33#endif
34
35#include <tcpdump-stdinc.h>
36
37#include <stdio.h>
38#include <stdlib.h>
39#include <string.h>
40#include <pcap.h>
41
42#include "interface.h"
43#include "addrtoname.h"
44#include "ethertype.h"
45#include "extract.h"			/* must come after interface.h */
46#include "appletalk.h"
47
48static struct tok type2str[] = {
49	{ ddpRTMP,		"rtmp" },
50	{ ddpRTMPrequest,	"rtmpReq" },
51	{ ddpECHO,		"echo" },
52	{ ddpIP,		"IP" },
53	{ ddpARP,		"ARP" },
54	{ ddpKLAP,		"KLAP" },
55	{ 0,			NULL }
56};
57
58struct aarp {
59	u_int16_t	htype, ptype;
60	u_int8_t	halen, palen;
61	u_int16_t	op;
62	u_int8_t	hsaddr[6];
63	u_int8_t	psaddr[4];
64	u_int8_t	hdaddr[6];
65	u_int8_t	pdaddr[4];
66};
67
68static char tstr[] = "[|atalk]";
69
70static void atp_print(const struct atATP *, u_int);
71static void atp_bitmap_print(u_char);
72static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
73static const char *print_cstring(const char *, const u_char *);
74static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
75						const u_char *,
76						u_short, u_char, u_char);
77static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
78					       const u_char *);
79static const char *ataddr_string(u_short, u_char);
80static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
81static const char *ddpskt_string(int);
82
83/*
84 * Print LLAP packets received on a physical LocalTalk interface.
85 */
86u_int
87ltalk_if_print(const struct pcap_pkthdr *h, const u_char *p)
88{
89	return (llap_print(p, h->caplen));
90}
91
92/*
93 * Print AppleTalk LLAP packets.
94 */
95u_int
96llap_print(register const u_char *bp, u_int length)
97{
98	register const struct LAP *lp;
99	register const struct atDDP *dp;
100	register const struct atShortDDP *sdp;
101	u_short snet;
102	u_int hdrlen;
103
104#if 0
105	/*
106	 * Our packet is on a 4-byte boundary, as we're either called
107	 * directly from a top-level link-layer printer (ltalk_if_print)
108	 * or from the UDP printer.  The LLAP+DDP header is a multiple
109	 * of 4 bytes in length, so the DDP payload is also on a 4-byte
110	 * boundary, and we don't need to align it before calling
111	 * "ddp_print()".
112	 */
113	lp = (const struct LAP *)bp;
114	bp += sizeof(*lp);
115	length -= sizeof(*lp);
116#else
117	{
118		static struct LAP lp_ = {0, 0, lapDDP};
119		lp = &lp_;
120	}
121#endif
122	hdrlen = sizeof(*lp);
123	switch (lp->type) {
124
125	case lapShortDDP:
126		if (length < ddpSSize) {
127			(void)printf(" [|sddp %d]", length);
128			return (length);
129		}
130		sdp = (const struct atShortDDP *)bp;
131		printf("%s.%s",
132		    ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
133		printf(" > %s.%s:",
134		    ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
135		bp += ddpSSize;
136		length -= ddpSSize;
137		hdrlen += ddpSSize;
138		ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
139		break;
140
141	case lapDDP:
142		if (length < ddpSize) {
143			(void)printf(" [|ddp %d]", length);
144			return (length);
145		}
146		dp = (const struct atDDP *)bp;
147		snet = EXTRACT_16BITS(&dp->srcNet);
148		printf("%s.%s", ataddr_string(snet, dp->srcNode),
149		    ddpskt_string(dp->srcSkt));
150		printf(" > %s.%s:",
151		    ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
152		    ddpskt_string(dp->dstSkt));
153		bp += ddpSize;
154		length -= ddpSize;
155		hdrlen += ddpSize;
156		ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
157		break;
158
159#ifdef notdef
160	case lapKLAP:
161		klap_print(bp, length);
162		break;
163#endif
164
165	default:
166		printf("%d > %d at-lap#%d %d",
167		    lp->src, lp->dst, lp->type, length);
168		break;
169	}
170	return (hdrlen);
171}
172
173/*
174 * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
175 * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
176 * packets in them).
177 */
178void
179atalk_print(register const u_char *bp, u_int length)
180{
181	register const struct atDDP *dp;
182	u_short snet;
183
184        if(!eflag)
185            printf("AT ");
186
187	if (length < ddpSize) {
188		(void)printf(" [|ddp %d]", length);
189		return;
190	}
191	dp = (const struct atDDP *)bp;
192	snet = EXTRACT_16BITS(&dp->srcNet);
193	printf("%s.%s", ataddr_string(snet, dp->srcNode),
194	       ddpskt_string(dp->srcSkt));
195	printf(" > %s.%s: ",
196	       ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
197	       ddpskt_string(dp->dstSkt));
198	bp += ddpSize;
199	length -= ddpSize;
200	ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
201}
202
203/* XXX should probably pass in the snap header and do checks like arp_print() */
204void
205aarp_print(register const u_char *bp, u_int length)
206{
207	register const struct aarp *ap;
208
209#define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
210
211	printf("aarp ");
212	ap = (const struct aarp *)bp;
213	if (EXTRACT_16BITS(&ap->htype) == 1 &&
214	    EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
215	    ap->halen == 6 && ap->palen == 4 )
216		switch (EXTRACT_16BITS(&ap->op)) {
217
218		case 1:				/* request */
219			(void)printf("who-has %s tell %s",
220			    AT(pdaddr), AT(psaddr));
221			return;
222
223		case 2:				/* response */
224			(void)printf("reply %s is-at %s",
225			    AT(psaddr), etheraddr_string(ap->hsaddr));
226			return;
227
228		case 3:				/* probe (oy!) */
229			(void)printf("probe %s tell %s",
230			    AT(pdaddr), AT(psaddr));
231			return;
232		}
233	(void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
234	    length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
235	    EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen);
236}
237
238/*
239 * Print AppleTalk Datagram Delivery Protocol packets.
240 */
241static void
242ddp_print(register const u_char *bp, register u_int length, register int t,
243	  register u_short snet, register u_char snode, u_char skt)
244{
245
246	switch (t) {
247
248	case ddpNBP:
249		nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
250		break;
251
252	case ddpATP:
253		atp_print((const struct atATP *)bp, length);
254		break;
255
256	case ddpEIGRP:
257		eigrp_print(bp, length);
258		break;
259
260	default:
261		(void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
262		break;
263	}
264}
265
266static void
267atp_print(register const struct atATP *ap, u_int length)
268{
269	char c;
270	u_int32_t data;
271
272	if ((const u_char *)(ap + 1) > snapend) {
273		/* Just bail if we don't have the whole chunk. */
274		fputs(tstr, stdout);
275		return;
276	}
277	length -= sizeof(*ap);
278	switch (ap->control & 0xc0) {
279
280	case atpReqCode:
281		(void)printf(" atp-req%s %d",
282			     ap->control & atpXO? " " : "*",
283			     EXTRACT_16BITS(&ap->transID));
284
285		atp_bitmap_print(ap->bitmap);
286
287		if (length != 0)
288			(void)printf(" [len=%d]", length);
289
290		switch (ap->control & (atpEOM|atpSTS)) {
291		case atpEOM:
292			(void)printf(" [EOM]");
293			break;
294		case atpSTS:
295			(void)printf(" [STS]");
296			break;
297		case atpEOM|atpSTS:
298			(void)printf(" [EOM,STS]");
299			break;
300		}
301		break;
302
303	case atpRspCode:
304		(void)printf(" atp-resp%s%d:%d (%d)",
305			     ap->control & atpEOM? "*" : " ",
306			     EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
307		switch (ap->control & (atpXO|atpSTS)) {
308		case atpXO:
309			(void)printf(" [XO]");
310			break;
311		case atpSTS:
312			(void)printf(" [STS]");
313			break;
314		case atpXO|atpSTS:
315			(void)printf(" [XO,STS]");
316			break;
317		}
318		break;
319
320	case atpRelCode:
321		(void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
322
323		atp_bitmap_print(ap->bitmap);
324
325		/* length should be zero */
326		if (length)
327			(void)printf(" [len=%d]", length);
328
329		/* there shouldn't be any control flags */
330		if (ap->control & (atpXO|atpEOM|atpSTS)) {
331			c = '[';
332			if (ap->control & atpXO) {
333				(void)printf("%cXO", c);
334				c = ',';
335			}
336			if (ap->control & atpEOM) {
337				(void)printf("%cEOM", c);
338				c = ',';
339			}
340			if (ap->control & atpSTS) {
341				(void)printf("%cSTS", c);
342				c = ',';
343			}
344			(void)printf("]");
345		}
346		break;
347
348	default:
349		(void)printf(" atp-0x%x  %d (%d)", ap->control,
350			     EXTRACT_16BITS(&ap->transID), length);
351		break;
352	}
353	data = EXTRACT_32BITS(&ap->userData);
354	if (data != 0)
355		(void)printf(" 0x%x", data);
356}
357
358static void
359atp_bitmap_print(register u_char bm)
360{
361	register char c;
362	register int i;
363
364	/*
365	 * The '& 0xff' below is needed for compilers that want to sign
366	 * extend a u_char, which is the case with the Ultrix compiler.
367	 * (gcc is smart enough to eliminate it, at least on the Sparc).
368	 */
369	if ((bm + 1) & (bm & 0xff)) {
370		c = '<';
371		for (i = 0; bm; ++i) {
372			if (bm & 1) {
373				(void)printf("%c%d", c, i);
374				c = ',';
375			}
376			bm >>= 1;
377		}
378		(void)printf(">");
379	} else {
380		for (i = 0; bm; ++i)
381			bm >>= 1;
382		if (i > 1)
383			(void)printf("<0-%d>", i - 1);
384		else
385			(void)printf("<0>");
386	}
387}
388
389static void
390nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
391	  register u_char snode, register u_char skt)
392{
393	register const struct atNBPtuple *tp =
394		(const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
395	int i;
396	const u_char *ep;
397
398	if (length < nbpHeaderSize) {
399		(void)printf(" truncated-nbp %d", length);
400		return;
401	}
402
403	length -= nbpHeaderSize;
404	if (length < 8) {
405		/* must be room for at least one tuple */
406		(void)printf(" truncated-nbp %d", length + nbpHeaderSize);
407		return;
408	}
409	/* ep points to end of available data */
410	ep = snapend;
411	if ((const u_char *)tp > ep) {
412		fputs(tstr, stdout);
413		return;
414	}
415	switch (i = np->control & 0xf0) {
416
417	case nbpBrRq:
418	case nbpLkUp:
419		(void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
420			     np->id);
421		if ((const u_char *)(tp + 1) > ep) {
422			fputs(tstr, stdout);
423			return;
424		}
425		(void)nbp_name_print(tp, ep);
426		/*
427		 * look for anomalies: the spec says there can only
428		 * be one tuple, the address must match the source
429		 * address and the enumerator should be zero.
430		 */
431		if ((np->control & 0xf) != 1)
432			(void)printf(" [ntup=%d]", np->control & 0xf);
433		if (tp->enumerator)
434			(void)printf(" [enum=%d]", tp->enumerator);
435		if (EXTRACT_16BITS(&tp->net) != snet ||
436		    tp->node != snode || tp->skt != skt)
437			(void)printf(" [addr=%s.%d]",
438			    ataddr_string(EXTRACT_16BITS(&tp->net),
439			    tp->node), tp->skt);
440		break;
441
442	case nbpLkUpReply:
443		(void)printf(" nbp-reply %d:", np->id);
444
445		/* print each of the tuples in the reply */
446		for (i = np->control & 0xf; --i >= 0 && tp; )
447			tp = nbp_tuple_print(tp, ep, snet, snode, skt);
448		break;
449
450	default:
451		(void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
452				length);
453		break;
454	}
455}
456
457/* print a counted string */
458static const char *
459print_cstring(register const char *cp, register const u_char *ep)
460{
461	register u_int length;
462
463	if (cp >= (const char *)ep) {
464		fputs(tstr, stdout);
465		return (0);
466	}
467	length = *cp++;
468
469	/* Spec says string can be at most 32 bytes long */
470	if (length > 32) {
471		(void)printf("[len=%u]", length);
472		return (0);
473	}
474	while ((int)--length >= 0) {
475		if (cp >= (const char *)ep) {
476			fputs(tstr, stdout);
477			return (0);
478		}
479		putchar(*cp++);
480	}
481	return (cp);
482}
483
484static const struct atNBPtuple *
485nbp_tuple_print(register const struct atNBPtuple *tp,
486		register const u_char *ep,
487		register u_short snet, register u_char snode,
488		register u_char skt)
489{
490	register const struct atNBPtuple *tpn;
491
492	if ((const u_char *)(tp + 1) > ep) {
493		fputs(tstr, stdout);
494		return 0;
495	}
496	tpn = nbp_name_print(tp, ep);
497
498	/* if the enumerator isn't 1, print it */
499	if (tp->enumerator != 1)
500		(void)printf("(%d)", tp->enumerator);
501
502	/* if the socket doesn't match the src socket, print it */
503	if (tp->skt != skt)
504		(void)printf(" %d", tp->skt);
505
506	/* if the address doesn't match the src address, it's an anomaly */
507	if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
508		(void)printf(" [addr=%s]",
509		    ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
510
511	return (tpn);
512}
513
514static const struct atNBPtuple *
515nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
516{
517	register const char *cp = (const char *)tp + nbpTupleSize;
518
519	putchar(' ');
520
521	/* Object */
522	putchar('"');
523	if ((cp = print_cstring(cp, ep)) != NULL) {
524		/* Type */
525		putchar(':');
526		if ((cp = print_cstring(cp, ep)) != NULL) {
527			/* Zone */
528			putchar('@');
529			if ((cp = print_cstring(cp, ep)) != NULL)
530				putchar('"');
531		}
532	}
533	return ((const struct atNBPtuple *)cp);
534}
535
536
537#define HASHNAMESIZE 4096
538
539struct hnamemem {
540	int addr;
541	char *name;
542	struct hnamemem *nxt;
543};
544
545static struct hnamemem hnametable[HASHNAMESIZE];
546
547static const char *
548ataddr_string(u_short atnet, u_char athost)
549{
550	register struct hnamemem *tp, *tp2;
551	register int i = (atnet << 8) | athost;
552	char nambuf[MAXHOSTNAMELEN + 20];
553	static int first = 1;
554	FILE *fp;
555
556	/*
557	 * if this is the first call, see if there's an AppleTalk
558	 * number to name map file.
559	 */
560	if (first && (first = 0, !nflag)
561	    && (fp = fopen("/etc/atalk.names", "r"))) {
562		char line[256];
563		int i1, i2, i3;
564
565		while (fgets(line, sizeof(line), fp)) {
566			if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
567				continue;
568			if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
569				     nambuf) == 4)
570				/* got a hostname. */
571				i3 |= ((i1 << 8) | i2) << 8;
572			else if (sscanf(line, "%d.%d %256s", &i1, &i2,
573					nambuf) == 3)
574				/* got a net name */
575				i3 = (((i1 << 8) | i2) << 8) | 255;
576			else
577				continue;
578
579			for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
580			     tp->nxt; tp = tp->nxt)
581				;
582			tp->addr = i2;
583			tp->nxt = newhnamemem();
584			tp->name = strdup(nambuf);
585		}
586		fclose(fp);
587	}
588
589	for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
590		if (tp->addr == i)
591			return (tp->name);
592
593	/* didn't have the node name -- see if we've got the net name */
594	i |= 255;
595	for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
596		if (tp2->addr == i) {
597			tp->addr = (atnet << 8) | athost;
598			tp->nxt = newhnamemem();
599			(void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
600			    tp2->name, athost);
601			tp->name = strdup(nambuf);
602			return (tp->name);
603		}
604
605	tp->addr = (atnet << 8) | athost;
606	tp->nxt = newhnamemem();
607	if (athost != 255)
608		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
609		    atnet >> 8, atnet & 0xff, athost);
610	else
611		(void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
612		    atnet & 0xff);
613	tp->name = strdup(nambuf);
614
615	return (tp->name);
616}
617
618static struct tok skt2str[] = {
619	{ rtmpSkt,	"rtmp" },	/* routing table maintenance */
620	{ nbpSkt,	"nis" },	/* name info socket */
621	{ echoSkt,	"echo" },	/* AppleTalk echo protocol */
622	{ zipSkt,	"zip" },	/* zone info protocol */
623	{ 0,		NULL }
624};
625
626static const char *
627ddpskt_string(register int skt)
628{
629	static char buf[8];
630
631	if (nflag) {
632		(void)snprintf(buf, sizeof(buf), "%d", skt);
633		return (buf);
634	}
635	return (tok2str(skt2str, "%d", skt));
636}
637