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