contrib/tcpdump-3.8.3/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 1.78.2.2 2003/11/16 08:51:11 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 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 (length < ddpSize) {
 176                 (void)printf(" [|ddp %d]", length);
 177                 return;
 178         }
 179         dp = (const struct atDDP *)bp;
 180         snet = EXTRACT_16BITS(&dp->srcNet);
 181         printf("%s.%s", ataddr_string(snet, dp->srcNode),
 182                ddpskt_string(dp->srcSkt));
 183         printf(" > %s.%s:",
 184                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 185                ddpskt_string(dp->dstSkt));
 186         bp += ddpSize;
 187         length -= ddpSize;
 188         ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 189 }
 190
 191 /* XXX should probably pass in the snap header and do checks like arp_print() */
 192 void
 193 aarp_print(register const u_char *bp, u_int length)
 194 {
 195         register const struct aarp *ap;
 196
 197 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 198
 199         printf("aarp ");
 200         ap = (const struct aarp *)bp;
 201         if (EXTRACT_16BITS(&ap->htype) == 1 &&
 202             EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
 203             ap->halen == 6 && ap->palen == 4 )
 204                 switch (EXTRACT_16BITS(&ap->op)) {
 205
 206                 case 1:                         /* request */
 207                         (void)printf("who-has %s tell %s",
 208                             AT(pdaddr), AT(psaddr));
 209                         return;
 210
 211                 case 2:                         /* response */
 212                         (void)printf("reply %s is-at %s",
 213                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 214                         return;
 215
 216                 case 3:                         /* probe (oy!) */
 217                         (void)printf("probe %s tell %s",
 218                             AT(pdaddr), AT(psaddr));
 219                         return;
 220                 }
 221         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 222             length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
 223             EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen);
 224 }
 225
 226 /*
 227  * Print AppleTalk Datagram Delivery Protocol packets.
 228  */
 229 static void
 230 ddp_print(register const u_char *bp, register u_int length, register int t,
 231           register u_short snet, register u_char snode, u_char skt)
 232 {
 233
 234         switch (t) {
 235
 236         case ddpNBP:
 237                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 238                 break;
 239
 240         case ddpATP:
 241                 atp_print((const struct atATP *)bp, length);
 242                 break;
 243
 244         default:
 245                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 246                 break;
 247         }
 248 }
 249
 250 static void
 251 atp_print(register const struct atATP *ap, u_int length)
 252 {
 253         char c;
 254         u_int32_t data;
 255
 256         if ((const u_char *)(ap + 1) > snapend) {
 257                 /* Just bail if we don't have the whole chunk. */
 258                 fputs(tstr, stdout);
 259                 return;
 260         }
 261         length -= sizeof(*ap);
 262         switch (ap->control & 0xc0) {
 263
 264         case atpReqCode:
 265                 (void)printf(" atp-req%s %d",
 266                              ap->control & atpXO? " " : "*",
 267                              EXTRACT_16BITS(&ap->transID));
 268
 269                 atp_bitmap_print(ap->bitmap);
 270
 271                 if (length != 0)
 272                         (void)printf(" [len=%d]", length);
 273
 274                 switch (ap->control & (atpEOM|atpSTS)) {
 275                 case atpEOM:
 276                         (void)printf(" [EOM]");
 277                         break;
 278                 case atpSTS:
 279                         (void)printf(" [STS]");
 280                         break;
 281                 case atpEOM|atpSTS:
 282                         (void)printf(" [EOM,STS]");
 283                         break;
 284                 }
 285                 break;
 286
 287         case atpRspCode:
 288                 (void)printf(" atp-resp%s%d:%d (%d)",
 289                              ap->control & atpEOM? "*" : " ",
 290                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 291                 switch (ap->control & (atpXO|atpSTS)) {
 292                 case atpXO:
 293                         (void)printf(" [XO]");
 294                         break;
 295                 case atpSTS:
 296                         (void)printf(" [STS]");
 297                         break;
 298                 case atpXO|atpSTS:
 299                         (void)printf(" [XO,STS]");
 300                         break;
 301                 }
 302                 break;
 303
 304         case atpRelCode:
 305                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 306
 307                 atp_bitmap_print(ap->bitmap);
 308
 309                 /* length should be zero */
 310                 if (length)
 311                         (void)printf(" [len=%d]", length);
 312
 313                 /* there shouldn't be any control flags */
 314                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 315                         c = '[';
 316                         if (ap->control & atpXO) {
 317                                 (void)printf("%cXO", c);
 318                                 c = ',';
 319                         }
 320                         if (ap->control & atpEOM) {
 321                                 (void)printf("%cEOM", c);
 322                                 c = ',';
 323                         }
 324                         if (ap->control & atpSTS) {
 325                                 (void)printf("%cSTS", c);
 326                                 c = ',';
 327                         }
 328                         (void)printf("]");
 329                 }
 330                 break;
 331
 332         default:
 333                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 334                              EXTRACT_16BITS(&ap->transID), length);
 335                 break;
 336         }
 337         data = EXTRACT_32BITS(&ap->userData);
 338         if (data != 0)
 339                 (void)printf(" 0x%x", data);
 340 }
 341
 342 static void
 343 atp_bitmap_print(register u_char bm)
 344 {
 345         register char c;
 346         register int i;
 347
 348         /*
 349          * The '& 0xff' below is needed for compilers that want to sign
 350          * extend a u_char, which is the case with the Ultrix compiler.
 351          * (gcc is smart enough to eliminate it, at least on the Sparc).
 352          */
 353         if ((bm + 1) & (bm & 0xff)) {
 354                 c = '<';
 355                 for (i = 0; bm; ++i) {
 356                         if (bm & 1) {
 357                                 (void)printf("%c%d", c, i);
 358                                 c = ',';
 359                         }
 360                         bm >>= 1;
 361                 }
 362                 (void)printf(">");
 363         } else {
 364                 for (i = 0; bm; ++i)
 365                         bm >>= 1;
 366                 if (i > 1)
 367                         (void)printf("<0-%d>", i - 1);
 368                 else
 369                         (void)printf("<0>");
 370         }
 371 }
 372
 373 static void
 374 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 375           register u_char snode, register u_char skt)
 376 {
 377         register const struct atNBPtuple *tp =
 378                 (const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 379         int i;
 380         const u_char *ep;
 381
 382         if (length < nbpHeaderSize) {
 383                 (void)printf(" truncated-nbp %d", length);
 384                 return;
 385         }
 386
 387         length -= nbpHeaderSize;
 388         if (length < 8) {
 389                 /* must be room for at least one tuple */
 390                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 391                 return;
 392         }
 393         /* ep points to end of available data */
 394         ep = snapend;
 395         if ((const u_char *)tp > ep) {
 396                 fputs(tstr, stdout);
 397                 return;
 398         }
 399         switch (i = np->control & 0xf0) {
 400
 401         case nbpBrRq:
 402         case nbpLkUp:
 403                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 404                              np->id);
 405                 if ((const u_char *)(tp + 1) > ep) {
 406                         fputs(tstr, stdout);
 407                         return;
 408                 }
 409                 (void)nbp_name_print(tp, ep);
 410                 /*
 411                  * look for anomalies: the spec says there can only
 412                  * be one tuple, the address must match the source
 413                  * address and the enumerator should be zero.
 414                  */
 415                 if ((np->control & 0xf) != 1)
 416                         (void)printf(" [ntup=%d]", np->control & 0xf);
 417                 if (tp->enumerator)
 418                         (void)printf(" [enum=%d]", tp->enumerator);
 419                 if (EXTRACT_16BITS(&tp->net) != snet ||
 420                     tp->node != snode || tp->skt != skt)
 421                         (void)printf(" [addr=%s.%d]",
 422                             ataddr_string(EXTRACT_16BITS(&tp->net),
 423                             tp->node), tp->skt);
 424                 break;
 425
 426         case nbpLkUpReply:
 427                 (void)printf(" nbp-reply %d:", np->id);
 428
 429                 /* print each of the tuples in the reply */
 430                 for (i = np->control & 0xf; --i >= 0 && tp; )
 431                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 432                 break;
 433
 434         default:
 435                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 436                                 length);
 437                 break;
 438         }
 439 }
 440
 441 /* print a counted string */
 442 static const char *
 443 print_cstring(register const char *cp, register const u_char *ep)
 444 {
 445         register u_int length;
 446
 447         if (cp >= (const char *)ep) {
 448                 fputs(tstr, stdout);
 449                 return (0);
 450         }
 451         length = *cp++;
 452
 453         /* Spec says string can be at most 32 bytes long */
 454         if (length > 32) {
 455                 (void)printf("[len=%u]", length);
 456                 return (0);
 457         }
 458         while ((int)--length >= 0) {
 459                 if (cp >= (const char *)ep) {
 460                         fputs(tstr, stdout);
 461                         return (0);
 462                 }
 463                 putchar(*cp++);
 464         }
 465         return (cp);
 466 }
 467
 468 static const struct atNBPtuple *
 469 nbp_tuple_print(register const struct atNBPtuple *tp,
 470                 register const u_char *ep,
 471                 register u_short snet, register u_char snode,
 472                 register u_char skt)
 473 {
 474         register const struct atNBPtuple *tpn;
 475
 476         if ((const u_char *)(tp + 1) > ep) {
 477                 fputs(tstr, stdout);
 478                 return 0;
 479         }
 480         tpn = nbp_name_print(tp, ep);
 481
 482         /* if the enumerator isn't 1, print it */
 483         if (tp->enumerator != 1)
 484                 (void)printf("(%d)", tp->enumerator);
 485
 486         /* if the socket doesn't match the src socket, print it */
 487         if (tp->skt != skt)
 488                 (void)printf(" %d", tp->skt);
 489
 490         /* if the address doesn't match the src address, it's an anomaly */
 491         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 492                 (void)printf(" [addr=%s]",
 493                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 494
 495         return (tpn);
 496 }
 497
 498 static const struct atNBPtuple *
 499 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 500 {
 501         register const char *cp = (const char *)tp + nbpTupleSize;
 502
 503         putchar(' ');
 504
 505         /* Object */
 506         putchar('"');
 507         if ((cp = print_cstring(cp, ep)) != NULL) {
 508                 /* Type */
 509                 putchar(':');
 510                 if ((cp = print_cstring(cp, ep)) != NULL) {
 511                         /* Zone */
 512                         putchar('@');
 513                         if ((cp = print_cstring(cp, ep)) != NULL)
 514                                 putchar('"');
 515                 }
 516         }
 517         return ((const struct atNBPtuple *)cp);
 518 }
 519
 520
 521 #define HASHNAMESIZE 4096
 522
 523 struct hnamemem {
 524         int addr;
 525         char *name;
 526         struct hnamemem *nxt;
 527 };
 528
 529 static struct hnamemem hnametable[HASHNAMESIZE];
 530
 531 static const char *
 532 ataddr_string(u_short atnet, u_char athost)
 533 {
 534         register struct hnamemem *tp, *tp2;
 535         register int i = (atnet << 8) | athost;
 536         char nambuf[MAXHOSTNAMELEN + 20];
 537         static int first = 1;
 538         FILE *fp;
 539
 540         /*
 541          * if this is the first call, see if there's an AppleTalk
 542          * number to name map file.
 543          */
 544         if (first && (first = 0, !nflag)
 545             && (fp = fopen("/etc/atalk.names", "r"))) {
 546                 char line[256];
 547                 int i1, i2, i3;
 548
 549                 while (fgets(line, sizeof(line), fp)) {
 550                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 551                                 continue;
 552                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 553                                      nambuf) == 4)
 554                                 /* got a hostname. */
 555                                 i3 |= ((i1 << 8) | i2) << 8;
 556                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 557                                         nambuf) == 3)
 558                                 /* got a net name */
 559                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 560                         else
 561                                 continue;
 562
 563                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 564                              tp->nxt; tp = tp->nxt)
 565                                 ;
 566                         tp->addr = i3;
 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.%d",
 593                     atnet >> 8, atnet & 0xff, athost);
 594         else
 595                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 596                     atnet & 0xff);
 597         tp->name = strdup(nambuf);
 598
 599         return (tp->name);
 600 }
 601
 602 static struct tok skt2str[] = {
 603         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 604         { nbpSkt,       "nis" },        /* name info socket */
 605         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 606         { zipSkt,       "zip" },        /* zone info protocol */
 607         { 0,            NULL }
 608 };
 609
 610 static const char *
 611 ddpskt_string(register int skt)
 612 {
 613         static char buf[8];
 614
 615         if (nflag) {
 616                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 617                 return (buf);
 618         }
 619         return (tok2str(skt2str, "%d", skt));
 620 }