The Tcpdump Group git mirrors - tcpdump/blob - print-atalk.c

   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 #define NETDISSECT_REWORKED
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #include <stdio.h>
  32 #include <string.h>
  33
  34 #include "interface.h"
  35 #include "addrtoname.h"
  36 #include "ethertype.h"
  37 #include "extract.h"                    /* must come after interface.h */
  38 #include "appletalk.h"
  39
  40 static const char tstr[] = "[|atalk]";
  41
  42 static const struct tok type2str[] = {
  43         { ddpRTMP,              "rtmp" },
  44         { ddpRTMPrequest,       "rtmpReq" },
  45         { ddpECHO,              "echo" },
  46         { ddpIP,                "IP" },
  47         { ddpARP,               "ARP" },
  48         { ddpKLAP,              "KLAP" },
  49         { 0,                    NULL }
  50 };
  51
  52 struct aarp {
  53         uint16_t        htype, ptype;
  54         uint8_t         halen, palen;
  55         uint16_t        op;
  56         uint8_t         hsaddr[6];
  57         uint8_t         psaddr[4];
  58         uint8_t         hdaddr[6];
  59         uint8_t         pdaddr[4];
  60 };
  61
  62 static void atp_print(netdissect_options *, const struct atATP *, u_int);
  63 static void atp_bitmap_print(netdissect_options *, u_char);
  64 static void nbp_print(netdissect_options *, const struct atNBP *, u_int, u_short, u_char, u_char);
  65 static const struct atNBPtuple *nbp_tuple_print(netdissect_options *ndo, const struct atNBPtuple *,
  66                                                 const u_char *,
  67                                                 u_short, u_char, u_char);
  68 static const struct atNBPtuple *nbp_name_print(netdissect_options *, const struct atNBPtuple *,
  69                                                const u_char *);
  70 static const char *ataddr_string(netdissect_options *, u_short, u_char);
  71 static void ddp_print(netdissect_options *, const u_char *, u_int, int, u_short, u_char, u_char);
  72 static const char *ddpskt_string(netdissect_options *, int);
  73
  74 /*
  75  * Print LLAP packets received on a physical LocalTalk interface.
  76  */
  77 u_int
  78 ltalk_if_print(netdissect_options *ndo,
  79                const struct pcap_pkthdr *h, const u_char *p)
  80 {
  81         return (llap_print(ndo, p, h->caplen));
  82 }
  83
  84 /*
  85  * Print AppleTalk LLAP packets.
  86  */
  87 u_int
  88 llap_print(netdissect_options *ndo,
  89            register const u_char *bp, u_int length)
  90 {
  91         register const struct LAP *lp;
  92         register const struct atDDP *dp;
  93         register const struct atShortDDP *sdp;
  94         u_short snet;
  95         u_int hdrlen;
  96
  97         if (length < sizeof(*lp)) {
  98                 ND_PRINT((ndo, " [|llap %u]", length));
  99                 return (length);
 100         }
 101         lp = (const struct LAP *)bp;
 102         bp += sizeof(*lp);
 103         length -= sizeof(*lp);
 104         hdrlen = sizeof(*lp);
 105         switch (lp->type) {
 106
 107         case lapShortDDP:
 108                 if (length < ddpSSize) {
 109                         ND_PRINT((ndo, " [|sddp %u]", length));
 110                         return (length);
 111                 }
 112                 sdp = (const struct atShortDDP *)bp;
 113                 ND_PRINT((ndo, "%s.%s",
 114                     ataddr_string(ndo, 0, lp->src), ddpskt_string(ndo, sdp->srcSkt)));
 115                 ND_PRINT((ndo, " > %s.%s:",
 116                     ataddr_string(ndo, 0, lp->dst), ddpskt_string(ndo, sdp->dstSkt)));
 117                 bp += ddpSSize;
 118                 length -= ddpSSize;
 119                 hdrlen += ddpSSize;
 120                 ddp_print(ndo, bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 121                 break;
 122
 123         case lapDDP:
 124                 if (length < ddpSize) {
 125                         ND_PRINT((ndo, " [|ddp %u]", length));
 126                         return (length);
 127                 }
 128                 dp = (const struct atDDP *)bp;
 129                 snet = EXTRACT_16BITS(&dp->srcNet);
 130                 ND_PRINT((ndo, "%s.%s", ataddr_string(ndo, snet, dp->srcNode),
 131                     ddpskt_string(ndo, dp->srcSkt)));
 132                 ND_PRINT((ndo, " > %s.%s:",
 133                     ataddr_string(ndo, EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 134                     ddpskt_string(ndo, dp->dstSkt)));
 135                 bp += ddpSize;
 136                 length -= ddpSize;
 137                 hdrlen += ddpSize;
 138                 ddp_print(ndo, bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 139                 break;
 140
 141 #ifdef notdef
 142         case lapKLAP:
 143                 klap_print(bp, length);
 144                 break;
 145 #endif
 146
 147         default:
 148                 ND_PRINT((ndo, "%d > %d at-lap#%d %u",
 149                     lp->src, lp->dst, lp->type, length));
 150                 break;
 151         }
 152         return (hdrlen);
 153 }
 154
 155 /*
 156  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 157  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 158  * packets in them).
 159  */
 160 void
 161 atalk_print(netdissect_options *ndo,
 162             register const u_char *bp, u_int length)
 163 {
 164         register const struct atDDP *dp;
 165         u_short snet;
 166
 167         if(!ndo->ndo_eflag)
 168             ND_PRINT((ndo, "AT "));
 169
 170         if (length < ddpSize) {
 171                 ND_PRINT((ndo, " [|ddp %u]", length));
 172                 return;
 173         }
 174         dp = (const struct atDDP *)bp;
 175         snet = EXTRACT_16BITS(&dp->srcNet);
 176         ND_PRINT((ndo, "%s.%s", ataddr_string(ndo, snet, dp->srcNode),
 177                ddpskt_string(ndo, dp->srcSkt)));
 178         ND_PRINT((ndo, " > %s.%s: ",
 179                ataddr_string(ndo, EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 180                ddpskt_string(ndo, dp->dstSkt)));
 181         bp += ddpSize;
 182         length -= ddpSize;
 183         ddp_print(ndo, bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 184 }
 185
 186 /* XXX should probably pass in the snap header and do checks like arp_print() */
 187 void
 188 aarp_print(netdissect_options *ndo,
 189            register const u_char *bp, u_int length)
 190 {
 191         register const struct aarp *ap;
 192
 193 #define AT(member) ataddr_string(ndo, (ap->member[1]<<8)|ap->member[2],ap->member[3])
 194
 195         ND_PRINT((ndo, "aarp "));
 196         ap = (const struct aarp *)bp;
 197         if (EXTRACT_16BITS(&ap->htype) == 1 &&
 198             EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
 199             ap->halen == 6 && ap->palen == 4 )
 200                 switch (EXTRACT_16BITS(&ap->op)) {
 201
 202                 case 1:                         /* request */
 203                         ND_PRINT((ndo, "who-has %s tell %s", AT(pdaddr), AT(psaddr)));
 204                         return;
 205
 206                 case 2:                         /* response */
 207                         ND_PRINT((ndo, "reply %s is-at %s", AT(psaddr), etheraddr_string(ndo, ap->hsaddr)));
 208                         return;
 209
 210                 case 3:                         /* probe (oy!) */
 211                         ND_PRINT((ndo, "probe %s tell %s", AT(pdaddr), AT(psaddr)));
 212                         return;
 213                 }
 214         ND_PRINT((ndo, "len %u op %u htype %u ptype %#x halen %u palen %u",
 215             length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
 216             EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen));
 217 }
 218
 219 /*
 220  * Print AppleTalk Datagram Delivery Protocol packets.
 221  */
 222 static void
 223 ddp_print(netdissect_options *ndo,
 224           register const u_char *bp, register u_int length, register int t,
 225           register u_short snet, register u_char snode, u_char skt)
 226 {
 227
 228         switch (t) {
 229
 230         case ddpNBP:
 231                 nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
 232                 break;
 233
 234         case ddpATP:
 235                 atp_print(ndo, (const struct atATP *)bp, length);
 236                 break;
 237
 238         case ddpEIGRP:
 239                 eigrp_print(ndo, bp, length);
 240                 break;
 241
 242         default:
 243                 ND_PRINT((ndo, " at-%s %d", tok2str(type2str, NULL, t), length));
 244                 break;
 245         }
 246 }
 247
 248 static void
 249 atp_print(netdissect_options *ndo,
 250           register const struct atATP *ap, u_int length)
 251 {
 252         char c;
 253         uint32_t data;
 254
 255         if ((const u_char *)(ap + 1) > ndo->ndo_snapend) {
 256                 /* Just bail if we don't have the whole chunk. */
 257                 ND_PRINT((ndo, "%s", tstr));
 258                 return;
 259         }
 260         if (length < sizeof(*ap)) {
 261                 ND_PRINT((ndo, " [|atp %u]", length));
 262                 return;
 263         }
 264         length -= sizeof(*ap);
 265         switch (ap->control & 0xc0) {
 266
 267         case atpReqCode:
 268                 ND_PRINT((ndo, " atp-req%s %d",
 269                              ap->control & atpXO? " " : "*",
 270                              EXTRACT_16BITS(&ap->transID)));
 271
 272                 atp_bitmap_print(ndo, ap->bitmap);
 273
 274                 if (length != 0)
 275                         ND_PRINT((ndo, " [len=%u]", length));
 276
 277                 switch (ap->control & (atpEOM|atpSTS)) {
 278                 case atpEOM:
 279                         ND_PRINT((ndo, " [EOM]"));
 280                         break;
 281                 case atpSTS:
 282                         ND_PRINT((ndo, " [STS]"));
 283                         break;
 284                 case atpEOM|atpSTS:
 285                         ND_PRINT((ndo, " [EOM,STS]"));
 286                         break;
 287                 }
 288                 break;
 289
 290         case atpRspCode:
 291                 ND_PRINT((ndo, " atp-resp%s%d:%d (%u)",
 292                              ap->control & atpEOM? "*" : " ",
 293                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length));
 294                 switch (ap->control & (atpXO|atpSTS)) {
 295                 case atpXO:
 296                         ND_PRINT((ndo, " [XO]"));
 297                         break;
 298                 case atpSTS:
 299                         ND_PRINT((ndo, " [STS]"));
 300                         break;
 301                 case atpXO|atpSTS:
 302                         ND_PRINT((ndo, " [XO,STS]"));
 303                         break;
 304                 }
 305                 break;
 306
 307         case atpRelCode:
 308                 ND_PRINT((ndo, " atp-rel  %d", EXTRACT_16BITS(&ap->transID)));
 309
 310                 atp_bitmap_print(ndo, ap->bitmap);
 311
 312                 /* length should be zero */
 313                 if (length)
 314                         ND_PRINT((ndo, " [len=%u]", length));
 315
 316                 /* there shouldn't be any control flags */
 317                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 318                         c = '[';
 319                         if (ap->control & atpXO) {
 320                                 ND_PRINT((ndo, "%cXO", c));
 321                                 c = ',';
 322                         }
 323                         if (ap->control & atpEOM) {
 324                                 ND_PRINT((ndo, "%cEOM", c));
 325                                 c = ',';
 326                         }
 327                         if (ap->control & atpSTS) {
 328                                 ND_PRINT((ndo, "%cSTS", c));
 329                                 c = ',';
 330                         }
 331                         ND_PRINT((ndo, "]"));
 332                 }
 333                 break;
 334
 335         default:
 336                 ND_PRINT((ndo, " atp-0x%x  %d (%u)", ap->control,
 337                              EXTRACT_16BITS(&ap->transID), length));
 338                 break;
 339         }
 340         data = EXTRACT_32BITS(&ap->userData);
 341         if (data != 0)
 342                 ND_PRINT((ndo, " 0x%x", data));
 343 }
 344
 345 static void
 346 atp_bitmap_print(netdissect_options *ndo,
 347                  register u_char bm)
 348 {
 349         register char c;
 350         register int i;
 351
 352         /*
 353          * The '& 0xff' below is needed for compilers that want to sign
 354          * extend a u_char, which is the case with the Ultrix compiler.
 355          * (gcc is smart enough to eliminate it, at least on the Sparc).
 356          */
 357         if ((bm + 1) & (bm & 0xff)) {
 358                 c = '<';
 359                 for (i = 0; bm; ++i) {
 360                         if (bm & 1) {
 361                                 ND_PRINT((ndo, "%c%d", c, i));
 362                                 c = ',';
 363                         }
 364                         bm >>= 1;
 365                 }
 366                 ND_PRINT((ndo, ">"));
 367         } else {
 368                 for (i = 0; bm; ++i)
 369                         bm >>= 1;
 370                 if (i > 1)
 371                         ND_PRINT((ndo, "<0-%d>", i - 1));
 372                 else
 373                         ND_PRINT((ndo, "<0>"));
 374         }
 375 }
 376
 377 static void
 378 nbp_print(netdissect_options *ndo,
 379           register const struct atNBP *np, u_int length, register u_short snet,
 380           register u_char snode, register u_char skt)
 381 {
 382         register const struct atNBPtuple *tp =
 383                 (const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 384         int i;
 385         const u_char *ep;
 386
 387         if (length < nbpHeaderSize) {
 388                 ND_PRINT((ndo, " truncated-nbp %u", length));
 389                 return;
 390         }
 391
 392         length -= nbpHeaderSize;
 393         if (length < 8) {
 394                 /* must be room for at least one tuple */
 395                 ND_PRINT((ndo, " truncated-nbp %u", length + nbpHeaderSize));
 396                 return;
 397         }
 398         /* ep points to end of available data */
 399         ep = ndo->ndo_snapend;
 400         if ((const u_char *)tp > ep) {
 401                 ND_PRINT((ndo, "%s", tstr));
 402                 return;
 403         }
 404         switch (i = np->control & 0xf0) {
 405
 406         case nbpBrRq:
 407         case nbpLkUp:
 408                 ND_PRINT((ndo, i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:", np->id));
 409                 if ((const u_char *)(tp + 1) > ep) {
 410                         ND_PRINT((ndo, "%s", tstr));
 411                         return;
 412                 }
 413                 (void)nbp_name_print(ndo, tp, ep);
 414                 /*
 415                  * look for anomalies: the spec says there can only
 416                  * be one tuple, the address must match the source
 417                  * address and the enumerator should be zero.
 418                  */
 419                 if ((np->control & 0xf) != 1)
 420                         ND_PRINT((ndo, " [ntup=%d]", np->control & 0xf));
 421                 if (tp->enumerator)
 422                         ND_PRINT((ndo, " [enum=%d]", tp->enumerator));
 423                 if (EXTRACT_16BITS(&tp->net) != snet ||
 424                     tp->node != snode || tp->skt != skt)
 425                         ND_PRINT((ndo, " [addr=%s.%d]",
 426                             ataddr_string(ndo, EXTRACT_16BITS(&tp->net),
 427                             tp->node), tp->skt));
 428                 break;
 429
 430         case nbpLkUpReply:
 431                 ND_PRINT((ndo, " nbp-reply %d:", np->id));
 432
 433                 /* print each of the tuples in the reply */
 434                 for (i = np->control & 0xf; --i >= 0 && tp; )
 435                         tp = nbp_tuple_print(ndo, tp, ep, snet, snode, skt);
 436                 break;
 437
 438         default:
 439                 ND_PRINT((ndo, " nbp-0x%x  %d (%u)", np->control, np->id, length));
 440                 break;
 441         }
 442 }
 443
 444 /* print a counted string */
 445 static const char *
 446 print_cstring(netdissect_options *ndo,
 447               register const char *cp, register const u_char *ep)
 448 {
 449         register u_int length;
 450
 451         if (cp >= (const char *)ep) {
 452                 ND_PRINT((ndo, "%s", tstr));
 453                 return (0);
 454         }
 455         length = *cp++;
 456
 457         /* Spec says string can be at most 32 bytes long */
 458         if (length > 32) {
 459                 ND_PRINT((ndo, "[len=%u]", length));
 460                 return (0);
 461         }
 462         while ((int)--length >= 0) {
 463                 if (cp >= (const char *)ep) {
 464                         ND_PRINT((ndo, "%s", tstr));
 465                         return (0);
 466                 }
 467                 ND_PRINT((ndo, "%c", *cp++));
 468         }
 469         return (cp);
 470 }
 471
 472 static const struct atNBPtuple *
 473 nbp_tuple_print(netdissect_options *ndo,
 474                 register const struct atNBPtuple *tp, register const u_char *ep,
 475                 register u_short snet, register u_char snode, register u_char skt)
 476 {
 477         register const struct atNBPtuple *tpn;
 478
 479         if ((const u_char *)(tp + 1) > ep) {
 480                 ND_PRINT((ndo, "%s", tstr));
 481                 return 0;
 482         }
 483         tpn = nbp_name_print(ndo, tp, ep);
 484
 485         /* if the enumerator isn't 1, print it */
 486         if (tp->enumerator != 1)
 487                 ND_PRINT((ndo, "(%d)", tp->enumerator));
 488
 489         /* if the socket doesn't match the src socket, print it */
 490         if (tp->skt != skt)
 491                 ND_PRINT((ndo, " %d", tp->skt));
 492
 493         /* if the address doesn't match the src address, it's an anomaly */
 494         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 495                 ND_PRINT((ndo, " [addr=%s]",
 496                     ataddr_string(ndo, EXTRACT_16BITS(&tp->net), tp->node)));
 497
 498         return (tpn);
 499 }
 500
 501 static const struct atNBPtuple *
 502 nbp_name_print(netdissect_options *ndo,
 503                const struct atNBPtuple *tp, register const u_char *ep)
 504 {
 505         register const char *cp = (const char *)tp + nbpTupleSize;
 506
 507         ND_PRINT((ndo, " "));
 508
 509         /* Object */
 510         ND_PRINT((ndo, "\""));
 511         if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 512                 /* Type */
 513                 ND_PRINT((ndo, ":"));
 514                 if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 515                         /* Zone */
 516                         ND_PRINT((ndo, "@"));
 517                         if ((cp = print_cstring(ndo, cp, ep)) != NULL)
 518                                 ND_PRINT((ndo, "\""));
 519                 }
 520         }
 521         return ((const struct atNBPtuple *)cp);
 522 }
 523
 524
 525 #define HASHNAMESIZE 4096
 526
 527 struct hnamemem {
 528         int addr;
 529         char *name;
 530         struct hnamemem *nxt;
 531 };
 532
 533 static struct hnamemem hnametable[HASHNAMESIZE];
 534
 535 static const char *
 536 ataddr_string(netdissect_options *ndo,
 537               u_short atnet, u_char athost)
 538 {
 539         register struct hnamemem *tp, *tp2;
 540         register int i = (atnet << 8) | athost;
 541         char nambuf[256+1];
 542         static int first = 1;
 543         FILE *fp;
 544
 545         /*
 546          * if this is the first call, see if there's an AppleTalk
 547          * number to name map file.
 548          */
 549         if (first && (first = 0, !ndo->ndo_nflag)
 550             && (fp = fopen("/etc/atalk.names", "r"))) {
 551                 char line[256];
 552                 int i1, i2;
 553
 554                 while (fgets(line, sizeof(line), fp)) {
 555                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 556                                 continue;
 557                         if (sscanf(line, "%d.%d %256s", &i1, &i2, nambuf) == 3)
 558                                 /* got a hostname. */
 559                                 i2 |= (i1 << 8);
 560                         else if (sscanf(line, "%d %256s", &i1, nambuf) == 2)
 561                                 /* got a net name */
 562                                 i2 = (i1 << 8) | 255;
 563                         else
 564                                 continue;
 565
 566                         for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
 567                              tp->nxt; tp = tp->nxt)
 568                                 ;
 569                         tp->addr = i2;
 570                         tp->nxt = newhnamemem();
 571                         tp->name = strdup(nambuf);
 572                 }
 573                 fclose(fp);
 574         }
 575
 576         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 577                 if (tp->addr == i)
 578                         return (tp->name);
 579
 580         /* didn't have the node name -- see if we've got the net name */
 581         i |= 255;
 582         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 583                 if (tp2->addr == i) {
 584                         tp->addr = (atnet << 8) | athost;
 585                         tp->nxt = newhnamemem();
 586                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 587                             tp2->name, athost);
 588                         tp->name = strdup(nambuf);
 589                         return (tp->name);
 590                 }
 591
 592         tp->addr = (atnet << 8) | athost;
 593         tp->nxt = newhnamemem();
 594         if (athost != 255)
 595                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet, athost);
 596         else
 597                 (void)snprintf(nambuf, sizeof(nambuf), "%d", atnet);
 598         tp->name = strdup(nambuf);
 599
 600         return (tp->name);
 601 }
 602
 603 static const struct tok skt2str[] = {
 604         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 605         { nbpSkt,       "nis" },        /* name info socket */
 606         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 607         { zipSkt,       "zip" },        /* zone info protocol */
 608         { 0,            NULL }
 609 };
 610
 611 static const char *
 612 ddpskt_string(netdissect_options *ndo,
 613               register int skt)
 614 {
 615         static char buf[8];
 616
 617         if (ndo->ndo_nflag) {
 618                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 619                 return (buf);
 620         }
 621         return (tok2str(skt2str, "%d", skt));
 622 }