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