contrib/tcpdump/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 #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 }