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 1.65 2001-01-20 07:22:23 guy Exp $ (LBL)";
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <sys/param.h>
  34 #include <sys/time.h>
  35 #include <sys/socket.h>
  36
  37 #include <netinet/in.h>
  38
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <netdb.h>              /* for MAXHOSTNAMELEN on some platforms */
  43
  44 #include "interface.h"
  45 #include "addrtoname.h"
  46 #include "ethertype.h"
  47 #include "extract.h"                    /* must come after interface.h */
  48 #include "appletalk.h"
  49
  50 static struct tok type2str[] = {
  51         { ddpRTMP,              "rtmp" },
  52         { ddpRTMPrequest,       "rtmpReq" },
  53         { ddpECHO,              "echo" },
  54         { ddpIP,                "IP" },
  55         { ddpARP,               "ARP" },
  56         { ddpKLAP,              "KLAP" },
  57         { 0,                    NULL }
  58 };
  59
  60 struct aarp {
  61         u_int16_t       htype, ptype;
  62         u_int8_t        halen, palen;
  63         u_int16_t       op;
  64         u_int8_t        hsaddr[6];
  65         u_int8_t        psaddr[4];
  66         u_int8_t        hdaddr[6];
  67         u_int8_t        pdaddr[4];
  68 };
  69
  70 static char tstr[] = "[|atalk]";
  71
  72 static void atp_print(const struct atATP *, u_int);
  73 static void atp_bitmap_print(u_char);
  74 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  75 static const char *print_cstring(const char *, const u_char *);
  76 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  77                                                 const u_char *,
  78                                                 u_short, u_char, u_char);
  79 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  80                                                const u_char *);
  81 static const char *ataddr_string(u_short, u_char);
  82 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  83 static const char *ddpskt_string(int);
  84
  85 /*
  86  * Print AppleTalk LLAP packets.
  87  */
  88 void
  89 llap_print(register const u_char *bp, u_int length)
  90 {
  91         register const struct LAP *lp;
  92         register const struct atDDP *dp;
  93         register const struct atShortDDP *sdp;
  94         u_short snet;
  95
  96         lp = (struct LAP *)bp;
  97         bp += sizeof(*lp);
  98         length -= sizeof(*lp);
  99         switch (lp->type) {
 100
 101         case lapShortDDP:
 102                 if (length < ddpSSize) {
 103                         (void)printf(" [|sddp %d]", length);
 104                         return;
 105                 }
 106                 sdp = (const struct atShortDDP *)bp;
 107                 printf("%s.%s",
 108                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 109                 printf(" > %s.%s:",
 110                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 111                 bp += ddpSSize;
 112                 length -= ddpSSize;
 113                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 114                 break;
 115
 116         case lapDDP:
 117                 if (length < ddpSize) {
 118                         (void)printf(" [|ddp %d]", length);
 119                         return;
 120                 }
 121                 dp = (const struct atDDP *)bp;
 122                 snet = EXTRACT_16BITS(&dp->srcNet);
 123                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 124                     ddpskt_string(dp->srcSkt));
 125                 printf(" > %s.%s:",
 126                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 127                     ddpskt_string(dp->dstSkt));
 128                 bp += ddpSize;
 129                 length -= ddpSize;
 130                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 131                 break;
 132
 133 #ifdef notdef
 134         case lapKLAP:
 135                 klap_print(bp, length);
 136                 break;
 137 #endif
 138
 139         default:
 140                 printf("%d > %d at-lap#%d %d",
 141                     lp->src, lp->dst, lp->type, length);
 142                 break;
 143         }
 144 }
 145
 146 /*
 147  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 148  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 149  * packets in them).
 150  */
 151 void
 152 atalk_print(register const u_char *bp, u_int length)
 153 {
 154         register const struct atDDP *dp;
 155         u_short snet;
 156
 157         if (length < ddpSize) {
 158           (void)printf(" [|ddp %d]", length);
 159           return;
 160         }
 161         dp = (const struct atDDP *)bp;
 162         snet = EXTRACT_16BITS(&dp->srcNet);
 163         printf("%s.%s", ataddr_string(snet, dp->srcNode),
 164                ddpskt_string(dp->srcSkt));
 165         printf(" > %s.%s:",
 166                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 167                ddpskt_string(dp->dstSkt));
 168         bp += ddpSize;
 169         length -= ddpSize;
 170         ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 171 }
 172
 173 /* XXX should probably pass in the snap header and do checks like arp_print() */
 174 void
 175 aarp_print(register const u_char *bp, u_int length)
 176 {
 177         register const struct aarp *ap;
 178
 179 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 180
 181         printf("aarp ");
 182         ap = (const struct aarp *)bp;
 183         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 184             ap->halen == 6 && ap->palen == 4 )
 185                 switch (ntohs(ap->op)) {
 186
 187                 case 1:                         /* request */
 188                         (void)printf("who-has %s tell %s",
 189                             AT(pdaddr), AT(psaddr));
 190                         return;
 191
 192                 case 2:                         /* response */
 193                         (void)printf("reply %s is-at %s",
 194                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 195                         return;
 196
 197                 case 3:                         /* probe (oy!) */
 198                         (void)printf("probe %s tell %s",
 199                             AT(pdaddr), AT(psaddr));
 200                         return;
 201                 }
 202         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 203             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 204             ap->halen, ap->palen);
 205 }
 206
 207 /*
 208  * Print AppleTalk Datagram Delivery Protocol packets.
 209  */
 210 static void
 211 ddp_print(register const u_char *bp, register u_int length, register int t,
 212           register u_short snet, register u_char snode, u_char skt)
 213 {
 214
 215         switch (t) {
 216
 217         case ddpNBP:
 218                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 219                 break;
 220
 221         case ddpATP:
 222                 atp_print((const struct atATP *)bp, length);
 223                 break;
 224
 225         default:
 226                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 227                 break;
 228         }
 229 }
 230
 231 static void
 232 atp_print(register const struct atATP *ap, u_int length)
 233 {
 234         char c;
 235         u_int32_t data;
 236
 237         if ((const u_char *)(ap + 1) > snapend) {
 238                 /* Just bail if we don't have the whole chunk. */
 239                 fputs(tstr, stdout);
 240                 return;
 241         }
 242         length -= sizeof(*ap);
 243         switch (ap->control & 0xc0) {
 244
 245         case atpReqCode:
 246                 (void)printf(" atp-req%s %d",
 247                              ap->control & atpXO? " " : "*",
 248                              EXTRACT_16BITS(&ap->transID));
 249
 250                 atp_bitmap_print(ap->bitmap);
 251
 252                 if (length != 0)
 253                         (void)printf(" [len=%d]", length);
 254
 255                 switch (ap->control & (atpEOM|atpSTS)) {
 256                 case atpEOM:
 257                         (void)printf(" [EOM]");
 258                         break;
 259                 case atpSTS:
 260                         (void)printf(" [STS]");
 261                         break;
 262                 case atpEOM|atpSTS:
 263                         (void)printf(" [EOM,STS]");
 264                         break;
 265                 }
 266                 break;
 267
 268         case atpRspCode:
 269                 (void)printf(" atp-resp%s%d:%d (%d)",
 270                              ap->control & atpEOM? "*" : " ",
 271                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 272                 switch (ap->control & (atpXO|atpSTS)) {
 273                 case atpXO:
 274                         (void)printf(" [XO]");
 275                         break;
 276                 case atpSTS:
 277                         (void)printf(" [STS]");
 278                         break;
 279                 case atpXO|atpSTS:
 280                         (void)printf(" [XO,STS]");
 281                         break;
 282                 }
 283                 break;
 284
 285         case atpRelCode:
 286                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 287
 288                 atp_bitmap_print(ap->bitmap);
 289
 290                 /* length should be zero */
 291                 if (length)
 292                         (void)printf(" [len=%d]", length);
 293
 294                 /* there shouldn't be any control flags */
 295                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 296                         c = '[';
 297                         if (ap->control & atpXO) {
 298                                 (void)printf("%cXO", c);
 299                                 c = ',';
 300                         }
 301                         if (ap->control & atpEOM) {
 302                                 (void)printf("%cEOM", c);
 303                                 c = ',';
 304                         }
 305                         if (ap->control & atpSTS) {
 306                                 (void)printf("%cSTS", c);
 307                                 c = ',';
 308                         }
 309                         (void)printf("]");
 310                 }
 311                 break;
 312
 313         default:
 314                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 315                              EXTRACT_16BITS(&ap->transID), length);
 316                 break;
 317         }
 318         data = EXTRACT_32BITS(&ap->userData);
 319         if (data != 0)
 320                 (void)printf(" 0x%x", data);
 321 }
 322
 323 static void
 324 atp_bitmap_print(register u_char bm)
 325 {
 326         register char c;
 327         register int i;
 328
 329         /*
 330          * The '& 0xff' below is needed for compilers that want to sign
 331          * extend a u_char, which is the case with the Ultrix compiler.
 332          * (gcc is smart enough to eliminate it, at least on the Sparc).
 333          */
 334         if ((bm + 1) & (bm & 0xff)) {
 335                 c = '<';
 336                 for (i = 0; bm; ++i) {
 337                         if (bm & 1) {
 338                                 (void)printf("%c%d", c, i);
 339                                 c = ',';
 340                         }
 341                         bm >>= 1;
 342                 }
 343                 (void)printf(">");
 344         } else {
 345                 for (i = 0; bm; ++i)
 346                         bm >>= 1;
 347                 if (i > 1)
 348                         (void)printf("<0-%d>", i - 1);
 349                 else
 350                         (void)printf("<0>");
 351         }
 352 }
 353
 354 static void
 355 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 356           register u_char snode, register u_char skt)
 357 {
 358         register const struct atNBPtuple *tp =
 359                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 360         int i;
 361         const u_char *ep;
 362
 363         length -= nbpHeaderSize;
 364         if (length < 8) {
 365                 /* must be room for at least one tuple */
 366                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 367                 return;
 368         }
 369         /* ep points to end of available data */
 370         ep = snapend;
 371         if ((const u_char *)tp > ep) {
 372                 fputs(tstr, stdout);
 373                 return;
 374         }
 375         switch (i = np->control & 0xf0) {
 376
 377         case nbpBrRq:
 378         case nbpLkUp:
 379                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 380                              np->id);
 381                 if ((const u_char *)(tp + 1) > ep) {
 382                         fputs(tstr, stdout);
 383                         return;
 384                 }
 385                 (void)nbp_name_print(tp, ep);
 386                 /*
 387                  * look for anomalies: the spec says there can only
 388                  * be one tuple, the address must match the source
 389                  * address and the enumerator should be zero.
 390                  */
 391                 if ((np->control & 0xf) != 1)
 392                         (void)printf(" [ntup=%d]", np->control & 0xf);
 393                 if (tp->enumerator)
 394                         (void)printf(" [enum=%d]", tp->enumerator);
 395                 if (EXTRACT_16BITS(&tp->net) != snet ||
 396                     tp->node != snode || tp->skt != skt)
 397                         (void)printf(" [addr=%s.%d]",
 398                             ataddr_string(EXTRACT_16BITS(&tp->net),
 399                             tp->node), tp->skt);
 400                 break;
 401
 402         case nbpLkUpReply:
 403                 (void)printf(" nbp-reply %d:", np->id);
 404
 405                 /* print each of the tuples in the reply */
 406                 for (i = np->control & 0xf; --i >= 0 && tp; )
 407                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 408                 break;
 409
 410         default:
 411                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 412                                 length);
 413                 break;
 414         }
 415 }
 416
 417 /* print a counted string */
 418 static const char *
 419 print_cstring(register const char *cp, register const u_char *ep)
 420 {
 421         register u_int length;
 422
 423         if (cp >= (const char *)ep) {
 424                 fputs(tstr, stdout);
 425                 return (0);
 426         }
 427         length = *cp++;
 428
 429         /* Spec says string can be at most 32 bytes long */
 430         if (length > 32) {
 431                 (void)printf("[len=%u]", length);
 432                 return (0);
 433         }
 434         while ((int)--length >= 0) {
 435                 if (cp >= (char *)ep) {
 436                         fputs(tstr, stdout);
 437                         return (0);
 438                 }
 439                 putchar(*cp++);
 440         }
 441         return (cp);
 442 }
 443
 444 static const struct atNBPtuple *
 445 nbp_tuple_print(register const struct atNBPtuple *tp,
 446                 register const u_char *ep,
 447                 register u_short snet, register u_char snode,
 448                 register u_char skt)
 449 {
 450         register const struct atNBPtuple *tpn;
 451
 452         if ((const u_char *)(tp + 1) > ep) {
 453                 fputs(tstr, stdout);
 454                 return 0;
 455         }
 456         tpn = nbp_name_print(tp, ep);
 457
 458         /* if the enumerator isn't 1, print it */
 459         if (tp->enumerator != 1)
 460                 (void)printf("(%d)", tp->enumerator);
 461
 462         /* if the socket doesn't match the src socket, print it */
 463         if (tp->skt != skt)
 464                 (void)printf(" %d", tp->skt);
 465
 466         /* if the address doesn't match the src address, it's an anomaly */
 467         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 468                 (void)printf(" [addr=%s]",
 469                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 470
 471         return (tpn);
 472 }
 473
 474 static const struct atNBPtuple *
 475 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 476 {
 477         register const char *cp = (const char *)tp + nbpTupleSize;
 478
 479         putchar(' ');
 480
 481         /* Object */
 482         putchar('"');
 483         if ((cp = print_cstring(cp, ep)) != NULL) {
 484                 /* Type */
 485                 putchar(':');
 486                 if ((cp = print_cstring(cp, ep)) != NULL) {
 487                         /* Zone */
 488                         putchar('@');
 489                         if ((cp = print_cstring(cp, ep)) != NULL)
 490                                 putchar('"');
 491                 }
 492         }
 493         return ((const struct atNBPtuple *)cp);
 494 }
 495
 496
 497 #define HASHNAMESIZE 4096
 498
 499 struct hnamemem {
 500         int addr;
 501         char *name;
 502         struct hnamemem *nxt;
 503 };
 504
 505 static struct hnamemem hnametable[HASHNAMESIZE];
 506
 507 static const char *
 508 ataddr_string(u_short atnet, u_char athost)
 509 {
 510         register struct hnamemem *tp, *tp2;
 511         register int i = (atnet << 8) | athost;
 512         char nambuf[MAXHOSTNAMELEN + 20];
 513         static int first = 1;
 514         FILE *fp;
 515
 516         /*
 517          * if this is the first call, see if there's an AppleTalk
 518          * number to name map file.
 519          */
 520         if (first && (first = 0, !nflag)
 521             && (fp = fopen("/etc/atalk.names", "r"))) {
 522                 char line[256];
 523                 int i1, i2, i3;
 524
 525                 while (fgets(line, sizeof(line), fp)) {
 526                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 527                                 continue;
 528                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 529                                      nambuf) == 4)
 530                                 /* got a hostname. */
 531                                 i3 |= ((i1 << 8) | i2) << 8;
 532                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 533                                         nambuf) == 3)
 534                                 /* got a net name */
 535                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 536                         else
 537                                 continue;
 538
 539                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 540                              tp->nxt; tp = tp->nxt)
 541                                 ;
 542                         tp->addr = i3;
 543                         tp->nxt = newhnamemem();
 544                         tp->name = strdup(nambuf);
 545                 }
 546                 fclose(fp);
 547         }
 548
 549         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 550                 if (tp->addr == i)
 551                         return (tp->name);
 552
 553         /* didn't have the node name -- see if we've got the net name */
 554         i |= 255;
 555         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 556                 if (tp2->addr == i) {
 557                         tp->addr = (atnet << 8) | athost;
 558                         tp->nxt = newhnamemem();
 559                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 560                             tp2->name, athost);
 561                         tp->name = strdup(nambuf);
 562                         return (tp->name);
 563                 }
 564
 565         tp->addr = (atnet << 8) | athost;
 566         tp->nxt = newhnamemem();
 567         if (athost != 255)
 568                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 569                     atnet >> 8, atnet & 0xff, athost);
 570         else
 571                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 572                     atnet & 0xff);
 573         tp->name = strdup(nambuf);
 574
 575         return (tp->name);
 576 }
 577
 578 static struct tok skt2str[] = {
 579         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 580         { nbpSkt,       "nis" },        /* name info socket */
 581         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 582         { zipSkt,       "zip" },        /* zone info protocol */
 583         { 0,            NULL }
 584 };
 585
 586 static const char *
 587 ddpskt_string(register int skt)
 588 {
 589         static char buf[8];
 590
 591         if (nflag) {
 592                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 593                 return (buf);
 594         }
 595         return (tok2str(skt2str, "%d", skt));
 596 }