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