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 1.72 2002-08-01 08:53:00 risso 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 <netdb.h>              /* for MAXHOSTNAMELEN on some platforms */
  39 #include <pcap.h>
  40
  41 #include "interface.h"
  42 #include "addrtoname.h"
  43 #include "ethertype.h"
  44 #include "extract.h"                    /* must come after interface.h */
  45 #include "appletalk.h"
  46
  47 static struct tok type2str[] = {
  48         { ddpRTMP,              "rtmp" },
  49         { ddpRTMPrequest,       "rtmpReq" },
  50         { ddpECHO,              "echo" },
  51         { ddpIP,                "IP" },
  52         { ddpARP,               "ARP" },
  53         { ddpKLAP,              "KLAP" },
  54         { 0,                    NULL }
  55 };
  56
  57 struct aarp {
  58         u_int16_t       htype, ptype;
  59         u_int8_t        halen, palen;
  60         u_int16_t       op;
  61         u_int8_t        hsaddr[6];
  62         u_int8_t        psaddr[4];
  63         u_int8_t        hdaddr[6];
  64         u_int8_t        pdaddr[4];
  65 };
  66
  67 static char tstr[] = "[|atalk]";
  68
  69 static void atp_print(const struct atATP *, u_int);
  70 static void atp_bitmap_print(u_char);
  71 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  72 static const char *print_cstring(const char *, const u_char *);
  73 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  74                                                 const u_char *,
  75                                                 u_short, u_char, u_char);
  76 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  77                                                const u_char *);
  78 static const char *ataddr_string(u_short, u_char);
  79 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  80 static const char *ddpskt_string(int);
  81
  82 /*
  83  * Print LLAP packets received on a physical LocalTalk interface.
  84  */
  85 void
  86 ltalk_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  87 {
  88         snapend = p + h->caplen;
  89         ++infodelay;
  90         ts_print(&h->ts);
  91         llap_print(p, h->caplen);
  92         if(xflag)
  93                 default_print(p, h->caplen);
  94         putchar('\n');
  95         --infodelay;
  96         if (infoprint)
  97                 info(0);
  98 }
  99
 100 /*
 101  * Print AppleTalk LLAP packets.
 102  */
 103 void
 104 llap_print(register const u_char *bp, u_int length)
 105 {
 106         register const struct LAP *lp;
 107         register const struct atDDP *dp;
 108         register const struct atShortDDP *sdp;
 109         u_short snet;
 110
 111         /*
 112          * Our packet is on a 4-byte boundary, as we're either called
 113          * directly from a top-level link-layer printer (ltalk_if_print)
 114          * or from the UDP printer.  The LLAP+DDP header is a multiple
 115          * of 4 bytes in length, so the DDP payload is also on a 4-byte
 116          * boundary, and we don't need to align it before calling
 117          * "ddp_print()".
 118          */
 119         lp = (const struct LAP *)bp;
 120         bp += sizeof(*lp);
 121         length -= sizeof(*lp);
 122         switch (lp->type) {
 123
 124         case lapShortDDP:
 125                 if (length < ddpSSize) {
 126                         (void)printf(" [|sddp %d]", length);
 127                         return;
 128                 }
 129                 sdp = (const struct atShortDDP *)bp;
 130                 printf("%s.%s",
 131                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 132                 printf(" > %s.%s:",
 133                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 134                 bp += ddpSSize;
 135                 length -= ddpSSize;
 136                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 137                 break;
 138
 139         case lapDDP:
 140                 if (length < ddpSize) {
 141                         (void)printf(" [|ddp %d]", length);
 142                         return;
 143                 }
 144                 dp = (const struct atDDP *)bp;
 145                 snet = EXTRACT_16BITS(&dp->srcNet);
 146                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 147                     ddpskt_string(dp->srcSkt));
 148                 printf(" > %s.%s:",
 149                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 150                     ddpskt_string(dp->dstSkt));
 151                 bp += ddpSize;
 152                 length -= ddpSize;
 153                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 154                 break;
 155
 156 #ifdef notdef
 157         case lapKLAP:
 158                 klap_print(bp, length);
 159                 break;
 160 #endif
 161
 162         default:
 163                 printf("%d > %d at-lap#%d %d",
 164                     lp->src, lp->dst, lp->type, length);
 165                 break;
 166         }
 167 }
 168
 169 /*
 170  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 171  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 172  * packets in them).
 173  */
 174 void
 175 atalk_print(register const u_char *bp, u_int length)
 176 {
 177         register const struct atDDP *dp;
 178         u_short snet;
 179
 180         if (length < ddpSize) {
 181                 (void)printf(" [|ddp %d]", length);
 182                 return;
 183         }
 184         dp = (const struct atDDP *)bp;
 185         snet = EXTRACT_16BITS(&dp->srcNet);
 186         printf("%s.%s", ataddr_string(snet, dp->srcNode),
 187                ddpskt_string(dp->srcSkt));
 188         printf(" > %s.%s:",
 189                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 190                ddpskt_string(dp->dstSkt));
 191         bp += ddpSize;
 192         length -= ddpSize;
 193 #ifdef LBL_ALIGN
 194         if ((long)bp & 3) {
 195                 static u_char *abuf = NULL;
 196
 197                 if (abuf == NULL) {
 198                         abuf = (u_char *)malloc(snaplen);
 199                         if (abuf == NULL)
 200                                 error("atalk_print: malloc");
 201                 }
 202                 memcpy((char *)abuf, (char *)bp, min(length, snaplen));
 203                 snapend += abuf - (u_char *)bp;
 204                 packetp = abuf;
 205                 bp = abuf;
 206         }
 207 #endif
 208         ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 209 }
 210
 211 /* XXX should probably pass in the snap header and do checks like arp_print() */
 212 void
 213 aarp_print(register const u_char *bp, u_int length)
 214 {
 215         register const struct aarp *ap;
 216
 217 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 218
 219         printf("aarp ");
 220         ap = (const struct aarp *)bp;
 221         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 222             ap->halen == 6 && ap->palen == 4 )
 223                 switch (ntohs(ap->op)) {
 224
 225                 case 1:                         /* request */
 226                         (void)printf("who-has %s tell %s",
 227                             AT(pdaddr), AT(psaddr));
 228                         return;
 229
 230                 case 2:                         /* response */
 231                         (void)printf("reply %s is-at %s",
 232                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 233                         return;
 234
 235                 case 3:                         /* probe (oy!) */
 236                         (void)printf("probe %s tell %s",
 237                             AT(pdaddr), AT(psaddr));
 238                         return;
 239                 }
 240         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 241             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 242             ap->halen, ap->palen);
 243 }
 244
 245 /*
 246  * Print AppleTalk Datagram Delivery Protocol packets.
 247  */
 248 static void
 249 ddp_print(register const u_char *bp, register u_int length, register int t,
 250           register u_short snet, register u_char snode, u_char skt)
 251 {
 252
 253         switch (t) {
 254
 255         case ddpNBP:
 256                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 257                 break;
 258
 259         case ddpATP:
 260                 atp_print((const struct atATP *)bp, length);
 261                 break;
 262
 263         default:
 264                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 265                 break;
 266         }
 267 }
 268
 269 static void
 270 atp_print(register const struct atATP *ap, u_int length)
 271 {
 272         char c;
 273         u_int32_t data;
 274
 275         if ((const u_char *)(ap + 1) > snapend) {
 276                 /* Just bail if we don't have the whole chunk. */
 277                 fputs(tstr, stdout);
 278                 return;
 279         }
 280         length -= sizeof(*ap);
 281         switch (ap->control & 0xc0) {
 282
 283         case atpReqCode:
 284                 (void)printf(" atp-req%s %d",
 285                              ap->control & atpXO? " " : "*",
 286                              EXTRACT_16BITS(&ap->transID));
 287
 288                 atp_bitmap_print(ap->bitmap);
 289
 290                 if (length != 0)
 291                         (void)printf(" [len=%d]", length);
 292
 293                 switch (ap->control & (atpEOM|atpSTS)) {
 294                 case atpEOM:
 295                         (void)printf(" [EOM]");
 296                         break;
 297                 case atpSTS:
 298                         (void)printf(" [STS]");
 299                         break;
 300                 case atpEOM|atpSTS:
 301                         (void)printf(" [EOM,STS]");
 302                         break;
 303                 }
 304                 break;
 305
 306         case atpRspCode:
 307                 (void)printf(" atp-resp%s%d:%d (%d)",
 308                              ap->control & atpEOM? "*" : " ",
 309                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 310                 switch (ap->control & (atpXO|atpSTS)) {
 311                 case atpXO:
 312                         (void)printf(" [XO]");
 313                         break;
 314                 case atpSTS:
 315                         (void)printf(" [STS]");
 316                         break;
 317                 case atpXO|atpSTS:
 318                         (void)printf(" [XO,STS]");
 319                         break;
 320                 }
 321                 break;
 322
 323         case atpRelCode:
 324                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 325
 326                 atp_bitmap_print(ap->bitmap);
 327
 328                 /* length should be zero */
 329                 if (length)
 330                         (void)printf(" [len=%d]", length);
 331
 332                 /* there shouldn't be any control flags */
 333                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 334                         c = '[';
 335                         if (ap->control & atpXO) {
 336                                 (void)printf("%cXO", c);
 337                                 c = ',';
 338                         }
 339                         if (ap->control & atpEOM) {
 340                                 (void)printf("%cEOM", c);
 341                                 c = ',';
 342                         }
 343                         if (ap->control & atpSTS) {
 344                                 (void)printf("%cSTS", c);
 345                                 c = ',';
 346                         }
 347                         (void)printf("]");
 348                 }
 349                 break;
 350
 351         default:
 352                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 353                              EXTRACT_16BITS(&ap->transID), length);
 354                 break;
 355         }
 356         data = EXTRACT_32BITS(&ap->userData);
 357         if (data != 0)
 358                 (void)printf(" 0x%x", data);
 359 }
 360
 361 static void
 362 atp_bitmap_print(register u_char bm)
 363 {
 364         register char c;
 365         register int i;
 366
 367         /*
 368          * The '& 0xff' below is needed for compilers that want to sign
 369          * extend a u_char, which is the case with the Ultrix compiler.
 370          * (gcc is smart enough to eliminate it, at least on the Sparc).
 371          */
 372         if ((bm + 1) & (bm & 0xff)) {
 373                 c = '<';
 374                 for (i = 0; bm; ++i) {
 375                         if (bm & 1) {
 376                                 (void)printf("%c%d", c, i);
 377                                 c = ',';
 378                         }
 379                         bm >>= 1;
 380                 }
 381                 (void)printf(">");
 382         } else {
 383                 for (i = 0; bm; ++i)
 384                         bm >>= 1;
 385                 if (i > 1)
 386                         (void)printf("<0-%d>", i - 1);
 387                 else
 388                         (void)printf("<0>");
 389         }
 390 }
 391
 392 static void
 393 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 394           register u_char snode, register u_char skt)
 395 {
 396         register const struct atNBPtuple *tp =
 397                 (const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 398         int i;
 399         const u_char *ep;
 400
 401         if (length < nbpHeaderSize) {
 402                 (void)printf(" truncated-nbp %d", length);
 403                 return;
 404         }
 405
 406         length -= nbpHeaderSize;
 407         if (length < 8) {
 408                 /* must be room for at least one tuple */
 409                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 410                 return;
 411         }
 412         /* ep points to end of available data */
 413         ep = snapend;
 414         if ((const u_char *)tp > ep) {
 415                 fputs(tstr, stdout);
 416                 return;
 417         }
 418         switch (i = np->control & 0xf0) {
 419
 420         case nbpBrRq:
 421         case nbpLkUp:
 422                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 423                              np->id);
 424                 if ((const u_char *)(tp + 1) > ep) {
 425                         fputs(tstr, stdout);
 426                         return;
 427                 }
 428                 (void)nbp_name_print(tp, ep);
 429                 /*
 430                  * look for anomalies: the spec says there can only
 431                  * be one tuple, the address must match the source
 432                  * address and the enumerator should be zero.
 433                  */
 434                 if ((np->control & 0xf) != 1)
 435                         (void)printf(" [ntup=%d]", np->control & 0xf);
 436                 if (tp->enumerator)
 437                         (void)printf(" [enum=%d]", tp->enumerator);
 438                 if (EXTRACT_16BITS(&tp->net) != snet ||
 439                     tp->node != snode || tp->skt != skt)
 440                         (void)printf(" [addr=%s.%d]",
 441                             ataddr_string(EXTRACT_16BITS(&tp->net),
 442                             tp->node), tp->skt);
 443                 break;
 444
 445         case nbpLkUpReply:
 446                 (void)printf(" nbp-reply %d:", np->id);
 447
 448                 /* print each of the tuples in the reply */
 449                 for (i = np->control & 0xf; --i >= 0 && tp; )
 450                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 451                 break;
 452
 453         default:
 454                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 455                                 length);
 456                 break;
 457         }
 458 }
 459
 460 /* print a counted string */
 461 static const char *
 462 print_cstring(register const char *cp, register const u_char *ep)
 463 {
 464         register u_int length;
 465
 466         if (cp >= (const char *)ep) {
 467                 fputs(tstr, stdout);
 468                 return (0);
 469         }
 470         length = *cp++;
 471
 472         /* Spec says string can be at most 32 bytes long */
 473         if (length > 32) {
 474                 (void)printf("[len=%u]", length);
 475                 return (0);
 476         }
 477         while ((int)--length >= 0) {
 478                 if (cp >= (const char *)ep) {
 479                         fputs(tstr, stdout);
 480                         return (0);
 481                 }
 482                 putchar(*cp++);
 483         }
 484         return (cp);
 485 }
 486
 487 static const struct atNBPtuple *
 488 nbp_tuple_print(register const struct atNBPtuple *tp,
 489                 register const u_char *ep,
 490                 register u_short snet, register u_char snode,
 491                 register u_char skt)
 492 {
 493         register const struct atNBPtuple *tpn;
 494
 495         if ((const u_char *)(tp + 1) > ep) {
 496                 fputs(tstr, stdout);
 497                 return 0;
 498         }
 499         tpn = nbp_name_print(tp, ep);
 500
 501         /* if the enumerator isn't 1, print it */
 502         if (tp->enumerator != 1)
 503                 (void)printf("(%d)", tp->enumerator);
 504
 505         /* if the socket doesn't match the src socket, print it */
 506         if (tp->skt != skt)
 507                 (void)printf(" %d", tp->skt);
 508
 509         /* if the address doesn't match the src address, it's an anomaly */
 510         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 511                 (void)printf(" [addr=%s]",
 512                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 513
 514         return (tpn);
 515 }
 516
 517 static const struct atNBPtuple *
 518 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 519 {
 520         register const char *cp = (const char *)tp + nbpTupleSize;
 521
 522         putchar(' ');
 523
 524         /* Object */
 525         putchar('"');
 526         if ((cp = print_cstring(cp, ep)) != NULL) {
 527                 /* Type */
 528                 putchar(':');
 529                 if ((cp = print_cstring(cp, ep)) != NULL) {
 530                         /* Zone */
 531                         putchar('@');
 532                         if ((cp = print_cstring(cp, ep)) != NULL)
 533                                 putchar('"');
 534                 }
 535         }
 536         return ((const struct atNBPtuple *)cp);
 537 }
 538
 539
 540 #define HASHNAMESIZE 4096
 541
 542 struct hnamemem {
 543         int addr;
 544         char *name;
 545         struct hnamemem *nxt;
 546 };
 547
 548 static struct hnamemem hnametable[HASHNAMESIZE];
 549
 550 static const char *
 551 ataddr_string(u_short atnet, u_char athost)
 552 {
 553         register struct hnamemem *tp, *tp2;
 554         register int i = (atnet << 8) | athost;
 555         char nambuf[MAXHOSTNAMELEN + 20];
 556         static int first = 1;
 557         FILE *fp;
 558
 559         /*
 560          * if this is the first call, see if there's an AppleTalk
 561          * number to name map file.
 562          */
 563         if (first && (first = 0, !nflag)
 564             && (fp = fopen("/etc/atalk.names", "r"))) {
 565                 char line[256];
 566                 int i1, i2, i3;
 567
 568                 while (fgets(line, sizeof(line), fp)) {
 569                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 570                                 continue;
 571                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 572                                      nambuf) == 4)
 573                                 /* got a hostname. */
 574                                 i3 |= ((i1 << 8) | i2) << 8;
 575                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 576                                         nambuf) == 3)
 577                                 /* got a net name */
 578                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 579                         else
 580                                 continue;
 581
 582                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 583                              tp->nxt; tp = tp->nxt)
 584                                 ;
 585                         tp->addr = i3;
 586                         tp->nxt = newhnamemem();
 587                         tp->name = strdup(nambuf);
 588                 }
 589                 fclose(fp);
 590         }
 591
 592         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 593                 if (tp->addr == i)
 594                         return (tp->name);
 595
 596         /* didn't have the node name -- see if we've got the net name */
 597         i |= 255;
 598         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 599                 if (tp2->addr == i) {
 600                         tp->addr = (atnet << 8) | athost;
 601                         tp->nxt = newhnamemem();
 602                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 603                             tp2->name, athost);
 604                         tp->name = strdup(nambuf);
 605                         return (tp->name);
 606                 }
 607
 608         tp->addr = (atnet << 8) | athost;
 609         tp->nxt = newhnamemem();
 610         if (athost != 255)
 611                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 612                     atnet >> 8, atnet & 0xff, athost);
 613         else
 614                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 615                     atnet & 0xff);
 616         tp->name = strdup(nambuf);
 617
 618         return (tp->name);
 619 }
 620
 621 static struct tok skt2str[] = {
 622         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 623         { nbpSkt,       "nis" },        /* name info socket */
 624         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 625         { zipSkt,       "zip" },        /* zone info protocol */
 626         { 0,            NULL }
 627 };
 628
 629 static const char *
 630 ddpskt_string(register int skt)
 631 {
 632         static char buf[8];
 633
 634         if (nflag) {
 635                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 636                 return (buf);
 637         }
 638         return (tok2str(skt2str, "%d", skt));
 639 }