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