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 * $FreeBSD$ 24 */ 25 26 #ifndef lint 27 static const char rcsid[] = 28 "@(#) $Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.70.2.1 2002/02/05 10:04:18 guy Exp $ (LBL)"; 29 #endif 30 31 #ifdef HAVE_CONFIG_H 32 #include "config.h" 33 #endif 34 35 #include <sys/param.h> 36 #include <sys/time.h> 37 #include <sys/socket.h> 38 39 #include <netinet/in.h> 40 41 #include <stdio.h> 42 #include <stdlib.h> 43 #include <string.h> 44 #include <netdb.h> /* for MAXHOSTNAMELEN on some platforms */ 45 #include <pcap.h> 46 47 #include "interface.h" 48 #include "addrtoname.h" 49 #include "ethertype.h" 50 #include "extract.h" /* must come after interface.h */ 51 #include "appletalk.h" 52 53 static struct tok type2str[] = { 54 { ddpRTMP, "rtmp" }, 55 { ddpRTMPrequest, "rtmpReq" }, 56 { ddpECHO, "echo" }, 57 { ddpIP, "IP" }, 58 { ddpARP, "ARP" }, 59 { ddpKLAP, "KLAP" }, 60 { 0, NULL } 61 }; 62 63 struct aarp { 64 u_int16_t htype, ptype; 65 u_int8_t halen, palen; 66 u_int16_t op; 67 u_int8_t hsaddr[6]; 68 u_int8_t psaddr[4]; 69 u_int8_t hdaddr[6]; 70 u_int8_t pdaddr[4]; 71 }; 72 73 static char tstr[] = "[|atalk]"; 74 75 static void atp_print(const struct atATP *, u_int); 76 static void atp_bitmap_print(u_char); 77 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char); 78 static const char *print_cstring(const char *, const u_char *); 79 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *, 80 const u_char *, 81 u_short, u_char, u_char); 82 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *, 83 const u_char *); 84 static const char *ataddr_string(u_short, u_char); 85 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char); 86 static const char *ddpskt_string(int); 87 88 /* 89 * Print LLAP packets received on a physical LocalTalk interface. 90 */ 91 void 92 ltalk_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p) 93 { 94 snapend = p + h->caplen; 95 ++infodelay; 96 ts_print(&h->ts); 97 llap_print(p, h->caplen); 98 if(xflag) 99 default_print(p, h->caplen); 100 putchar('\n'); 101 --infodelay; 102 if (infoprint) 103 info(0); 104 } 105 106 /* 107 * Print AppleTalk LLAP packets. 108 */ 109 void 110 llap_print(register const u_char *bp, u_int length) 111 { 112 register const struct LAP *lp; 113 register const struct atDDP *dp; 114 register const struct atShortDDP *sdp; 115 u_short snet; 116 117 #if 0 118 /* 119 * Our packet is on a 4-byte boundary, as we're either called 120 * directly from a top-level link-layer printer (ltalk_if_print) 121 * or from the UDP printer. The LLAP+DDP header is a multiple 122 * of 4 bytes in length, so the DDP payload is also on a 4-byte 123 * boundary, and we don't need to align it before calling 124 * "ddp_print()". 125 */ 126 lp = (const struct LAP *)bp; 127 bp += sizeof(*lp); 128 length -= sizeof(*lp); 129 #else 130 { 131 static struct LAP lp_ = {0, 0, lapDDP}; 132 lp = &lp_; 133 } 134 #endif 135 switch (lp->type) { 136 137 case lapShortDDP: 138 if (length < ddpSSize) { 139 (void)printf(" [|sddp %d]", length); 140 return; 141 } 142 sdp = (const struct atShortDDP *)bp; 143 printf("%s.%s", 144 ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt)); 145 printf(" > %s.%s:", 146 ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt)); 147 bp += ddpSSize; 148 length -= ddpSSize; 149 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt); 150 break; 151 152 case lapDDP: 153 if (length < ddpSize) { 154 (void)printf(" [|ddp %d]", length); 155 return; 156 } 157 dp = (const struct atDDP *)bp; 158 snet = EXTRACT_16BITS(&dp->srcNet); 159 printf("%s.%s", ataddr_string(snet, dp->srcNode), 160 ddpskt_string(dp->srcSkt)); 161 printf(" > %s.%s:", 162 ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode), 163 ddpskt_string(dp->dstSkt)); 164 bp += ddpSize; 165 length -= ddpSize; 166 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt); 167 break; 168 169 #ifdef notdef 170 case lapKLAP: 171 klap_print(bp, length); 172 break; 173 #endif 174 175 default: 176 printf("%d > %d at-lap#%d %d", 177 lp->src, lp->dst, lp->type, length); 178 break; 179 } 180 } 181 182 /* 183 * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called 184 * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk 185 * packets in them). 186 */ 187 void 188 atalk_print(register const u_char *bp, u_int length) 189 { 190 register const struct atDDP *dp; 191 u_short snet; 192 193 if (length < ddpSize) { 194 (void)printf(" [|ddp %d]", length); 195 return; 196 } 197 dp = (const struct atDDP *)bp; 198 snet = EXTRACT_16BITS(&dp->srcNet); 199 printf("%s.%s", ataddr_string(snet, dp->srcNode), 200 ddpskt_string(dp->srcSkt)); 201 printf(" > %s.%s:", 202 ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode), 203 ddpskt_string(dp->dstSkt)); 204 bp += ddpSize; 205 length -= ddpSize; 206 #ifdef LBL_ALIGN 207 if ((long)bp & 3) { 208 static u_char *abuf = NULL; 209 210 if (abuf == NULL) { 211 abuf = (u_char *)malloc(snaplen); 212 if (abuf == NULL) 213 error("atalk_print: malloc"); 214 } 215 memcpy((char *)abuf, (char *)bp, min(length, snaplen)); 216 snapend += abuf - (u_char *)bp; 217 packetp = abuf; 218 bp = abuf; 219 } 220 #endif 221 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt); 222 } 223 224 /* XXX should probably pass in the snap header and do checks like arp_print() */ 225 void 226 aarp_print(register const u_char *bp, u_int length) 227 { 228 register const struct aarp *ap; 229 230 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3]) 231 232 printf("aarp "); 233 ap = (const struct aarp *)bp; 234 if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK && 235 ap->halen == 6 && ap->palen == 4 ) 236 switch (ntohs(ap->op)) { 237 238 case 1: /* request */ 239 (void)printf("who-has %s tell %s", 240 AT(pdaddr), AT(psaddr)); 241 return; 242 243 case 2: /* response */ 244 (void)printf("reply %s is-at %s", 245 AT(psaddr), etheraddr_string(ap->hsaddr)); 246 return; 247 248 case 3: /* probe (oy!) */ 249 (void)printf("probe %s tell %s", 250 AT(pdaddr), AT(psaddr)); 251 return; 252 } 253 (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u", 254 length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype), 255 ap->halen, ap->palen); 256 } 257 258 /* 259 * Print AppleTalk Datagram Delivery Protocol packets. 260 */ 261 static void 262 ddp_print(register const u_char *bp, register u_int length, register int t, 263 register u_short snet, register u_char snode, u_char skt) 264 { 265 266 switch (t) { 267 268 case ddpNBP: 269 nbp_print((const struct atNBP *)bp, length, snet, snode, skt); 270 break; 271 272 case ddpATP: 273 atp_print((const struct atATP *)bp, length); 274 break; 275 276 default: 277 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length); 278 break; 279 } 280 } 281 282 static void 283 atp_print(register const struct atATP *ap, u_int length) 284 { 285 char c; 286 u_int32_t data; 287 288 if ((const u_char *)(ap + 1) > snapend) { 289 /* Just bail if we don't have the whole chunk. */ 290 fputs(tstr, stdout); 291 return; 292 } 293 length -= sizeof(*ap); 294 switch (ap->control & 0xc0) { 295 296 case atpReqCode: 297 (void)printf(" atp-req%s %d", 298 ap->control & atpXO? " " : "*", 299 EXTRACT_16BITS(&ap->transID)); 300 301 atp_bitmap_print(ap->bitmap); 302 303 if (length != 0) 304 (void)printf(" [len=%d]", length); 305 306 switch (ap->control & (atpEOM|atpSTS)) { 307 case atpEOM: 308 (void)printf(" [EOM]"); 309 break; 310 case atpSTS: 311 (void)printf(" [STS]"); 312 break; 313 case atpEOM|atpSTS: 314 (void)printf(" [EOM,STS]"); 315 break; 316 } 317 break; 318 319 case atpRspCode: 320 (void)printf(" atp-resp%s%d:%d (%d)", 321 ap->control & atpEOM? "*" : " ", 322 EXTRACT_16BITS(&ap->transID), ap->bitmap, length); 323 switch (ap->control & (atpXO|atpSTS)) { 324 case atpXO: 325 (void)printf(" [XO]"); 326 break; 327 case atpSTS: 328 (void)printf(" [STS]"); 329 break; 330 case atpXO|atpSTS: 331 (void)printf(" [XO,STS]"); 332 break; 333 } 334 break; 335 336 case atpRelCode: 337 (void)printf(" atp-rel %d", EXTRACT_16BITS(&ap->transID)); 338 339 atp_bitmap_print(ap->bitmap); 340 341 /* length should be zero */ 342 if (length) 343 (void)printf(" [len=%d]", length); 344 345 /* there shouldn't be any control flags */ 346 if (ap->control & (atpXO|atpEOM|atpSTS)) { 347 c = '['; 348 if (ap->control & atpXO) { 349 (void)printf("%cXO", c); 350 c = ','; 351 } 352 if (ap->control & atpEOM) { 353 (void)printf("%cEOM", c); 354 c = ','; 355 } 356 if (ap->control & atpSTS) { 357 (void)printf("%cSTS", c); 358 c = ','; 359 } 360 (void)printf("]"); 361 } 362 break; 363 364 default: 365 (void)printf(" atp-0x%x %d (%d)", ap->control, 366 EXTRACT_16BITS(&ap->transID), length); 367 break; 368 } 369 data = EXTRACT_32BITS(&ap->userData); 370 if (data != 0) 371 (void)printf(" 0x%x", data); 372 } 373 374 static void 375 atp_bitmap_print(register u_char bm) 376 { 377 register char c; 378 register int i; 379 380 /* 381 * The '& 0xff' below is needed for compilers that want to sign 382 * extend a u_char, which is the case with the Ultrix compiler. 383 * (gcc is smart enough to eliminate it, at least on the Sparc). 384 */ 385 if ((bm + 1) & (bm & 0xff)) { 386 c = '<'; 387 for (i = 0; bm; ++i) { 388 if (bm & 1) { 389 (void)printf("%c%d", c, i); 390 c = ','; 391 } 392 bm >>= 1; 393 } 394 (void)printf(">"); 395 } else { 396 for (i = 0; bm; ++i) 397 bm >>= 1; 398 if (i > 1) 399 (void)printf("<0-%d>", i - 1); 400 else 401 (void)printf("<0>"); 402 } 403 } 404 405 static void 406 nbp_print(register const struct atNBP *np, u_int length, register u_short snet, 407 register u_char snode, register u_char skt) 408 { 409 register const struct atNBPtuple *tp = 410 (const struct atNBPtuple *)((u_char *)np + nbpHeaderSize); 411 int i; 412 const u_char *ep; 413 414 if (length < nbpHeaderSize) { 415 (void)printf(" truncated-nbp %d", length); 416 return; 417 } 418 419 length -= nbpHeaderSize; 420 if (length < 8) { 421 /* must be room for at least one tuple */ 422 (void)printf(" truncated-nbp %d", length + nbpHeaderSize); 423 return; 424 } 425 /* ep points to end of available data */ 426 ep = snapend; 427 if ((const u_char *)tp > ep) { 428 fputs(tstr, stdout); 429 return; 430 } 431 switch (i = np->control & 0xf0) { 432 433 case nbpBrRq: 434 case nbpLkUp: 435 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:", 436 np->id); 437 if ((const u_char *)(tp + 1) > ep) { 438 fputs(tstr, stdout); 439 return; 440 } 441 (void)nbp_name_print(tp, ep); 442 /* 443 * look for anomalies: the spec says there can only 444 * be one tuple, the address must match the source 445 * address and the enumerator should be zero. 446 */ 447 if ((np->control & 0xf) != 1) 448 (void)printf(" [ntup=%d]", np->control & 0xf); 449 if (tp->enumerator) 450 (void)printf(" [enum=%d]", tp->enumerator); 451 if (EXTRACT_16BITS(&tp->net) != snet || 452 tp->node != snode || tp->skt != skt) 453 (void)printf(" [addr=%s.%d]", 454 ataddr_string(EXTRACT_16BITS(&tp->net), 455 tp->node), tp->skt); 456 break; 457 458 case nbpLkUpReply: 459 (void)printf(" nbp-reply %d:", np->id); 460 461 /* print each of the tuples in the reply */ 462 for (i = np->control & 0xf; --i >= 0 && tp; ) 463 tp = nbp_tuple_print(tp, ep, snet, snode, skt); 464 break; 465 466 default: 467 (void)printf(" nbp-0x%x %d (%d)", np->control, np->id, 468 length); 469 break; 470 } 471 } 472 473 /* print a counted string */ 474 static const char * 475 print_cstring(register const char *cp, register const u_char *ep) 476 { 477 register u_int length; 478 479 if (cp >= (const char *)ep) { 480 fputs(tstr, stdout); 481 return (0); 482 } 483 length = *cp++; 484 485 /* Spec says string can be at most 32 bytes long */ 486 if (length > 32) { 487 (void)printf("[len=%u]", length); 488 return (0); 489 } 490 while ((int)--length >= 0) { 491 if (cp >= (const char *)ep) { 492 fputs(tstr, stdout); 493 return (0); 494 } 495 putchar(*cp++); 496 } 497 return (cp); 498 } 499 500 static const struct atNBPtuple * 501 nbp_tuple_print(register const struct atNBPtuple *tp, 502 register const u_char *ep, 503 register u_short snet, register u_char snode, 504 register u_char skt) 505 { 506 register const struct atNBPtuple *tpn; 507 508 if ((const u_char *)(tp + 1) > ep) { 509 fputs(tstr, stdout); 510 return 0; 511 } 512 tpn = nbp_name_print(tp, ep); 513 514 /* if the enumerator isn't 1, print it */ 515 if (tp->enumerator != 1) 516 (void)printf("(%d)", tp->enumerator); 517 518 /* if the socket doesn't match the src socket, print it */ 519 if (tp->skt != skt) 520 (void)printf(" %d", tp->skt); 521 522 /* if the address doesn't match the src address, it's an anomaly */ 523 if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode) 524 (void)printf(" [addr=%s]", 525 ataddr_string(EXTRACT_16BITS(&tp->net), tp->node)); 526 527 return (tpn); 528 } 529 530 static const struct atNBPtuple * 531 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep) 532 { 533 register const char *cp = (const char *)tp + nbpTupleSize; 534 535 putchar(' '); 536 537 /* Object */ 538 putchar('"'); 539 if ((cp = print_cstring(cp, ep)) != NULL) { 540 /* Type */ 541 putchar(':'); 542 if ((cp = print_cstring(cp, ep)) != NULL) { 543 /* Zone */ 544 putchar('@'); 545 if ((cp = print_cstring(cp, ep)) != NULL) 546 putchar('"'); 547 } 548 } 549 return ((const struct atNBPtuple *)cp); 550 } 551 552 553 #define HASHNAMESIZE 4096 554 555 struct hnamemem { 556 int addr; 557 char *name; 558 struct hnamemem *nxt; 559 }; 560 561 static struct hnamemem hnametable[HASHNAMESIZE]; 562 563 static const char * 564 ataddr_string(u_short atnet, u_char athost) 565 { 566 register struct hnamemem *tp, *tp2; 567 register int i = (atnet << 8) | athost; 568 char nambuf[MAXHOSTNAMELEN + 20]; 569 static int first = 1; 570 FILE *fp; 571 572 /* 573 * if this is the first call, see if there's an AppleTalk 574 * number to name map file. 575 */ 576 if (first && (first = 0, !nflag) 577 && (fp = fopen("/etc/atalk.names", "r"))) { 578 char line[256]; 579 int i1, i2, i3; 580 581 while (fgets(line, sizeof(line), fp)) { 582 if (line[0] == '\n' || line[0] == 0 || line[0] == '#') 583 continue; 584 if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3, 585 nambuf) == 4) 586 /* got a hostname. */ 587 i3 |= ((i1 << 8) | i2) << 8; 588 else if (sscanf(line, "%d.%d %256s", &i1, &i2, 589 nambuf) == 3) 590 /* got a net name */ 591 i3 = (((i1 << 8) | i2) << 8) | 255; 592 else 593 continue; 594 595 for (tp = &hnametable[i2 & (HASHNAMESIZE-1)]; 596 tp->nxt; tp = tp->nxt) 597 ; 598 tp->addr = i2; 599 tp->nxt = newhnamemem(); 600 tp->name = strdup(nambuf); 601 } 602 fclose(fp); 603 } 604 605 for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt) 606 if (tp->addr == i) 607 return (tp->name); 608 609 /* didn't have the node name -- see if we've got the net name */ 610 i |= 255; 611 for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt) 612 if (tp2->addr == i) { 613 tp->addr = (atnet << 8) | athost; 614 tp->nxt = newhnamemem(); 615 (void)snprintf(nambuf, sizeof(nambuf), "%s.%d", 616 tp2->name, athost); 617 tp->name = strdup(nambuf); 618 return (tp->name); 619 } 620 621 tp->addr = (atnet << 8) | athost; 622 tp->nxt = newhnamemem(); 623 if (athost != 255) 624 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d", 625 atnet >> 8, atnet & 0xff, athost); 626 else 627 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8, 628 atnet & 0xff); 629 tp->name = strdup(nambuf); 630 631 return (tp->name); 632 } 633 634 static struct tok skt2str[] = { 635 { rtmpSkt, "rtmp" }, /* routing table maintenance */ 636 { nbpSkt, "nis" }, /* name info socket */ 637 { echoSkt, "echo" }, /* AppleTalk echo protocol */ 638 { zipSkt, "zip" }, /* zone info protocol */ 639 { 0, NULL } 640 }; 641 642 static const char * 643 ddpskt_string(register int skt) 644 { 645 static char buf[8]; 646 647 if (nflag) { 648 (void)snprintf(buf, sizeof(buf), "%d", skt); 649 return (buf); 650 } 651 return (tok2str(skt2str, "%d", skt)); 652 } 653