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 #ifndef lint
  25 static const char rcsid[] =
  26     "@(#) $Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.77 2002-12-11 07:13:57 guy 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 void
  85 ltalk_if_print(u_char *user _U_, const struct pcap_pkthdr *h, const u_char *p)
  86 {
  87         snapend = p + h->caplen;
  88         ++infodelay;
  89         ts_print(&h->ts);
  90         llap_print(p, h->caplen);
  91         if(xflag)
  92                 default_print(p, h->caplen);
  93         putchar('\n');
  94         --infodelay;
  95         if (infoprint)
  96                 info(0);
  97 }
  98
  99 /*
 100  * Print AppleTalk LLAP packets.
 101  */
 102 void
 103 llap_print(register const u_char *bp, u_int length)
 104 {
 105         register const struct LAP *lp;
 106         register const struct atDDP *dp;
 107         register const struct atShortDDP *sdp;
 108         u_short snet;
 109
 110         /*
 111          * Our packet is on a 4-byte boundary, as we're either called
 112          * directly from a top-level link-layer printer (ltalk_if_print)
 113          * or from the UDP printer.  The LLAP+DDP header is a multiple
 114          * of 4 bytes in length, so the DDP payload is also on a 4-byte
 115          * boundary, and we don't need to align it before calling
 116          * "ddp_print()".
 117          */
 118         lp = (const struct LAP *)bp;
 119         bp += sizeof(*lp);
 120         length -= sizeof(*lp);
 121         switch (lp->type) {
 122
 123         case lapShortDDP:
 124                 if (length < ddpSSize) {
 125                         (void)printf(" [|sddp %d]", length);
 126                         return;
 127                 }
 128                 sdp = (const struct atShortDDP *)bp;
 129                 printf("%s.%s",
 130                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 131                 printf(" > %s.%s:",
 132                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 133                 bp += ddpSSize;
 134                 length -= ddpSSize;
 135                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 136                 break;
 137
 138         case lapDDP:
 139                 if (length < ddpSize) {
 140                         (void)printf(" [|ddp %d]", length);
 141                         return;
 142                 }
 143                 dp = (const struct atDDP *)bp;
 144                 snet = EXTRACT_16BITS(&dp->srcNet);
 145                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 146                     ddpskt_string(dp->srcSkt));
 147                 printf(" > %s.%s:",
 148                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 149                     ddpskt_string(dp->dstSkt));
 150                 bp += ddpSize;
 151                 length -= ddpSize;
 152                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 153                 break;
 154
 155 #ifdef notdef
 156         case lapKLAP:
 157                 klap_print(bp, length);
 158                 break;
 159 #endif
 160
 161         default:
 162                 printf("%d > %d at-lap#%d %d",
 163                     lp->src, lp->dst, lp->type, length);
 164                 break;
 165         }
 166 }
 167
 168 /*
 169  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 170  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 171  * packets in them).
 172  */
 173 void
 174 atalk_print(register const u_char *bp, u_int length)
 175 {
 176         register const struct atDDP *dp;
 177         u_short snet;
 178
 179         if (length < ddpSize) {
 180                 (void)printf(" [|ddp %d]", length);
 181                 return;
 182         }
 183         dp = (const struct atDDP *)bp;
 184         snet = EXTRACT_16BITS(&dp->srcNet);
 185         printf("%s.%s", ataddr_string(snet, dp->srcNode),
 186                ddpskt_string(dp->srcSkt));
 187         printf(" > %s.%s:",
 188                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 189                ddpskt_string(dp->dstSkt));
 190         bp += ddpSize;
 191         length -= ddpSize;
 192         ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 193 }
 194
 195 /* XXX should probably pass in the snap header and do checks like arp_print() */
 196 void
 197 aarp_print(register const u_char *bp, u_int length)
 198 {
 199         register const struct aarp *ap;
 200
 201 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 202
 203         printf("aarp ");
 204         ap = (const struct aarp *)bp;
 205         if (EXTRACT_16BITS(&ap->htype) == 1 &&
 206             EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
 207             ap->halen == 6 && ap->palen == 4 )
 208                 switch (EXTRACT_16BITS(&ap->op)) {
 209
 210                 case 1:                         /* request */
 211                         (void)printf("who-has %s tell %s",
 212                             AT(pdaddr), AT(psaddr));
 213                         return;
 214
 215                 case 2:                         /* response */
 216                         (void)printf("reply %s is-at %s",
 217                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 218                         return;
 219
 220                 case 3:                         /* probe (oy!) */
 221                         (void)printf("probe %s tell %s",
 222                             AT(pdaddr), AT(psaddr));
 223                         return;
 224                 }
 225         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 226             length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
 227             EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen);
 228 }
 229
 230 /*
 231  * Print AppleTalk Datagram Delivery Protocol packets.
 232  */
 233 static void
 234 ddp_print(register const u_char *bp, register u_int length, register int t,
 235           register u_short snet, register u_char snode, u_char skt)
 236 {
 237
 238         switch (t) {
 239
 240         case ddpNBP:
 241                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 242                 break;
 243
 244         case ddpATP:
 245                 atp_print((const struct atATP *)bp, length);
 246                 break;
 247
 248         default:
 249                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 250                 break;
 251         }
 252 }
 253
 254 static void
 255 atp_print(register const struct atATP *ap, u_int length)
 256 {
 257         char c;
 258         u_int32_t data;
 259
 260         if ((const u_char *)(ap + 1) > snapend) {
 261                 /* Just bail if we don't have the whole chunk. */
 262                 fputs(tstr, stdout);
 263                 return;
 264         }
 265         length -= sizeof(*ap);
 266         switch (ap->control & 0xc0) {
 267
 268         case atpReqCode:
 269                 (void)printf(" atp-req%s %d",
 270                              ap->control & atpXO? " " : "*",
 271                              EXTRACT_16BITS(&ap->transID));
 272
 273                 atp_bitmap_print(ap->bitmap);
 274
 275                 if (length != 0)
 276                         (void)printf(" [len=%d]", length);
 277
 278                 switch (ap->control & (atpEOM|atpSTS)) {
 279                 case atpEOM:
 280                         (void)printf(" [EOM]");
 281                         break;
 282                 case atpSTS:
 283                         (void)printf(" [STS]");
 284                         break;
 285                 case atpEOM|atpSTS:
 286                         (void)printf(" [EOM,STS]");
 287                         break;
 288                 }
 289                 break;
 290
 291         case atpRspCode:
 292                 (void)printf(" atp-resp%s%d:%d (%d)",
 293                              ap->control & atpEOM? "*" : " ",
 294                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 295                 switch (ap->control & (atpXO|atpSTS)) {
 296                 case atpXO:
 297                         (void)printf(" [XO]");
 298                         break;
 299                 case atpSTS:
 300                         (void)printf(" [STS]");
 301                         break;
 302                 case atpXO|atpSTS:
 303                         (void)printf(" [XO,STS]");
 304                         break;
 305                 }
 306                 break;
 307
 308         case atpRelCode:
 309                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 310
 311                 atp_bitmap_print(ap->bitmap);
 312
 313                 /* length should be zero */
 314                 if (length)
 315                         (void)printf(" [len=%d]", length);
 316
 317                 /* there shouldn't be any control flags */
 318                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 319                         c = '[';
 320                         if (ap->control & atpXO) {
 321                                 (void)printf("%cXO", c);
 322                                 c = ',';
 323                         }
 324                         if (ap->control & atpEOM) {
 325                                 (void)printf("%cEOM", c);
 326                                 c = ',';
 327                         }
 328                         if (ap->control & atpSTS) {
 329                                 (void)printf("%cSTS", c);
 330                                 c = ',';
 331                         }
 332                         (void)printf("]");
 333                 }
 334                 break;
 335
 336         default:
 337                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 338                              EXTRACT_16BITS(&ap->transID), length);
 339                 break;
 340         }
 341         data = EXTRACT_32BITS(&ap->userData);
 342         if (data != 0)
 343                 (void)printf(" 0x%x", data);
 344 }
 345
 346 static void
 347 atp_bitmap_print(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                                 (void)printf("%c%d", c, i);
 362                                 c = ',';
 363                         }
 364                         bm >>= 1;
 365                 }
 366                 (void)printf(">");
 367         } else {
 368                 for (i = 0; bm; ++i)
 369                         bm >>= 1;
 370                 if (i > 1)
 371                         (void)printf("<0-%d>", i - 1);
 372                 else
 373                         (void)printf("<0>");
 374         }
 375 }
 376
 377 static void
 378 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 379           register u_char snode, register u_char skt)
 380 {
 381         register const struct atNBPtuple *tp =
 382                 (const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 383         int i;
 384         const u_char *ep;
 385
 386         if (length < nbpHeaderSize) {
 387                 (void)printf(" truncated-nbp %d", length);
 388                 return;
 389         }
 390
 391         length -= nbpHeaderSize;
 392         if (length < 8) {
 393                 /* must be room for at least one tuple */
 394                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 395                 return;
 396         }
 397         /* ep points to end of available data */
 398         ep = snapend;
 399         if ((const u_char *)tp > ep) {
 400                 fputs(tstr, stdout);
 401                 return;
 402         }
 403         switch (i = np->control & 0xf0) {
 404
 405         case nbpBrRq:
 406         case nbpLkUp:
 407                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 408                              np->id);
 409                 if ((const u_char *)(tp + 1) > ep) {
 410                         fputs(tstr, stdout);
 411                         return;
 412                 }
 413                 (void)nbp_name_print(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                         (void)printf(" [ntup=%d]", np->control & 0xf);
 421                 if (tp->enumerator)
 422                         (void)printf(" [enum=%d]", tp->enumerator);
 423                 if (EXTRACT_16BITS(&tp->net) != snet ||
 424                     tp->node != snode || tp->skt != skt)
 425                         (void)printf(" [addr=%s.%d]",
 426                             ataddr_string(EXTRACT_16BITS(&tp->net),
 427                             tp->node), tp->skt);
 428                 break;
 429
 430         case nbpLkUpReply:
 431                 (void)printf(" 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(tp, ep, snet, snode, skt);
 436                 break;
 437
 438         default:
 439                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 440                                 length);
 441                 break;
 442         }
 443 }
 444
 445 /* print a counted string */
 446 static const char *
 447 print_cstring(register const char *cp, register const u_char *ep)
 448 {
 449         register u_int length;
 450
 451         if (cp >= (const char *)ep) {
 452                 fputs(tstr, stdout);
 453                 return (0);
 454         }
 455         length = *cp++;
 456
 457         /* Spec says string can be at most 32 bytes long */
 458         if (length > 32) {
 459                 (void)printf("[len=%u]", length);
 460                 return (0);
 461         }
 462         while ((int)--length >= 0) {
 463                 if (cp >= (const char *)ep) {
 464                         fputs(tstr, stdout);
 465                         return (0);
 466                 }
 467                 putchar(*cp++);
 468         }
 469         return (cp);
 470 }
 471
 472 static const struct atNBPtuple *
 473 nbp_tuple_print(register const struct atNBPtuple *tp,
 474                 register const u_char *ep,
 475                 register u_short snet, register u_char snode,
 476                 register u_char skt)
 477 {
 478         register const struct atNBPtuple *tpn;
 479
 480         if ((const u_char *)(tp + 1) > ep) {
 481                 fputs(tstr, stdout);
 482                 return 0;
 483         }
 484         tpn = nbp_name_print(tp, ep);
 485
 486         /* if the enumerator isn't 1, print it */
 487         if (tp->enumerator != 1)
 488                 (void)printf("(%d)", tp->enumerator);
 489
 490         /* if the socket doesn't match the src socket, print it */
 491         if (tp->skt != skt)
 492                 (void)printf(" %d", tp->skt);
 493
 494         /* if the address doesn't match the src address, it's an anomaly */
 495         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 496                 (void)printf(" [addr=%s]",
 497                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 498
 499         return (tpn);
 500 }
 501
 502 static const struct atNBPtuple *
 503 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 504 {
 505         register const char *cp = (const char *)tp + nbpTupleSize;
 506
 507         putchar(' ');
 508
 509         /* Object */
 510         putchar('"');
 511         if ((cp = print_cstring(cp, ep)) != NULL) {
 512                 /* Type */
 513                 putchar(':');
 514                 if ((cp = print_cstring(cp, ep)) != NULL) {
 515                         /* Zone */
 516                         putchar('@');
 517                         if ((cp = print_cstring(cp, ep)) != NULL)
 518                                 putchar('"');
 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(u_short atnet, u_char athost)
 537 {
 538         register struct hnamemem *tp, *tp2;
 539         register int i = (atnet << 8) | athost;
 540         char nambuf[MAXHOSTNAMELEN + 20];
 541         static int first = 1;
 542         FILE *fp;
 543
 544         /*
 545          * if this is the first call, see if there's an AppleTalk
 546          * number to name map file.
 547          */
 548         if (first && (first = 0, !nflag)
 549             && (fp = fopen("/etc/atalk.names", "r"))) {
 550                 char line[256];
 551                 int i1, i2, i3;
 552
 553                 while (fgets(line, sizeof(line), fp)) {
 554                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 555                                 continue;
 556                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 557                                      nambuf) == 4)
 558                                 /* got a hostname. */
 559                                 i3 |= ((i1 << 8) | i2) << 8;
 560                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 561                                         nambuf) == 3)
 562                                 /* got a net name */
 563                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 564                         else
 565                                 continue;
 566
 567                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 568                              tp->nxt; tp = tp->nxt)
 569                                 ;
 570                         tp->addr = i3;
 571                         tp->nxt = newhnamemem();
 572                         tp->name = strdup(nambuf);
 573                 }
 574                 fclose(fp);
 575         }
 576
 577         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 578                 if (tp->addr == i)
 579                         return (tp->name);
 580
 581         /* didn't have the node name -- see if we've got the net name */
 582         i |= 255;
 583         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 584                 if (tp2->addr == i) {
 585                         tp->addr = (atnet << 8) | athost;
 586                         tp->nxt = newhnamemem();
 587                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 588                             tp2->name, athost);
 589                         tp->name = strdup(nambuf);
 590                         return (tp->name);
 591                 }
 592
 593         tp->addr = (atnet << 8) | athost;
 594         tp->nxt = newhnamemem();
 595         if (athost != 255)
 596                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 597                     atnet >> 8, atnet & 0xff, athost);
 598         else
 599                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 600                     atnet & 0xff);
 601         tp->name = strdup(nambuf);
 602
 603         return (tp->name);
 604 }
 605
 606 static struct tok skt2str[] = {
 607         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 608         { nbpSkt,       "nis" },        /* name info socket */
 609         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 610         { zipSkt,       "zip" },        /* zone info protocol */
 611         { 0,            NULL }
 612 };
 613
 614 static const char *
 615 ddpskt_string(register int skt)
 616 {
 617         static char buf[8];
 618
 619         if (nflag) {
 620                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 621                 return (buf);
 622         }
 623         return (tok2str(skt2str, "%d", skt));
 624 }