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 1.64 2000-10-30 06:22:14 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 #include "savestr.h"
  50
  51 static struct tok type2str[] = {
  52         { ddpRTMP,              "rtmp" },
  53         { ddpRTMPrequest,       "rtmpReq" },
  54         { ddpECHO,              "echo" },
  55         { ddpIP,                "IP" },
  56         { ddpARP,               "ARP" },
  57         { ddpKLAP,              "KLAP" },
  58         { 0,                    NULL }
  59 };
  60
  61 struct aarp {
  62         u_int16_t       htype, ptype;
  63         u_int8_t        halen, palen;
  64         u_int16_t       op;
  65         u_int8_t        hsaddr[6];
  66         u_int8_t        psaddr[4];
  67         u_int8_t        hdaddr[6];
  68         u_int8_t        pdaddr[4];
  69 };
  70
  71 static char tstr[] = "[|atalk]";
  72
  73 static void atp_print(const struct atATP *, u_int);
  74 static void atp_bitmap_print(u_char);
  75 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  76 static const char *print_cstring(const char *, const u_char *);
  77 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  78                                                 const u_char *,
  79                                                 u_short, u_char, u_char);
  80 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  81                                                const u_char *);
  82 static const char *ataddr_string(u_short, u_char);
  83 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  84 static const char *ddpskt_string(int);
  85
  86 /*
  87  * Print AppleTalk LLAP packets.
  88  */
  89 void
  90 llap_print(register const u_char *bp, u_int length)
  91 {
  92         register const struct LAP *lp;
  93         register const struct atDDP *dp;
  94         register const struct atShortDDP *sdp;
  95         u_short snet;
  96
  97         lp = (struct LAP *)bp;
  98         bp += sizeof(*lp);
  99         length -= sizeof(*lp);
 100         switch (lp->type) {
 101
 102         case lapShortDDP:
 103                 if (length < ddpSSize) {
 104                         (void)printf(" [|sddp %d]", length);
 105                         return;
 106                 }
 107                 sdp = (const struct atShortDDP *)bp;
 108                 printf("%s.%s",
 109                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 110                 printf(" > %s.%s:",
 111                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 112                 bp += ddpSSize;
 113                 length -= ddpSSize;
 114                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 115                 break;
 116
 117         case lapDDP:
 118                 if (length < ddpSize) {
 119                         (void)printf(" [|ddp %d]", length);
 120                         return;
 121                 }
 122                 dp = (const struct atDDP *)bp;
 123                 snet = EXTRACT_16BITS(&dp->srcNet);
 124                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 125                     ddpskt_string(dp->srcSkt));
 126                 printf(" > %s.%s:",
 127                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 128                     ddpskt_string(dp->dstSkt));
 129                 bp += ddpSize;
 130                 length -= ddpSize;
 131                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 132                 break;
 133
 134 #ifdef notdef
 135         case lapKLAP:
 136                 klap_print(bp, length);
 137                 break;
 138 #endif
 139
 140         default:
 141                 printf("%d > %d at-lap#%d %d",
 142                     lp->src, lp->dst, lp->type, length);
 143                 break;
 144         }
 145 }
 146
 147 /*
 148  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 149  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 150  * packets in them).
 151  */
 152 void
 153 atalk_print(register const u_char *bp, u_int length)
 154 {
 155         register const struct atDDP *dp;
 156         u_short snet;
 157
 158         if (length < ddpSize) {
 159           (void)printf(" [|ddp %d]", length);
 160           return;
 161         }
 162         dp = (const struct atDDP *)bp;
 163         snet = EXTRACT_16BITS(&dp->srcNet);
 164         printf("%s.%s", ataddr_string(snet, dp->srcNode),
 165                ddpskt_string(dp->srcSkt));
 166         printf(" > %s.%s:",
 167                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 168                ddpskt_string(dp->dstSkt));
 169         bp += ddpSize;
 170         length -= ddpSize;
 171         ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 172 }
 173
 174 /* XXX should probably pass in the snap header and do checks like arp_print() */
 175 void
 176 aarp_print(register const u_char *bp, u_int length)
 177 {
 178         register const struct aarp *ap;
 179
 180 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 181
 182         printf("aarp ");
 183         ap = (const struct aarp *)bp;
 184         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 185             ap->halen == 6 && ap->palen == 4 )
 186                 switch (ntohs(ap->op)) {
 187
 188                 case 1:                         /* request */
 189                         (void)printf("who-has %s tell %s",
 190                             AT(pdaddr), AT(psaddr));
 191                         return;
 192
 193                 case 2:                         /* response */
 194                         (void)printf("reply %s is-at %s",
 195                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 196                         return;
 197
 198                 case 3:                         /* probe (oy!) */
 199                         (void)printf("probe %s tell %s",
 200                             AT(pdaddr), AT(psaddr));
 201                         return;
 202                 }
 203         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 204             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 205             ap->halen, ap->palen);
 206 }
 207
 208 /*
 209  * Print AppleTalk Datagram Delivery Protocol packets.
 210  */
 211 static void
 212 ddp_print(register const u_char *bp, register u_int length, register int t,
 213           register u_short snet, register u_char snode, u_char skt)
 214 {
 215
 216         switch (t) {
 217
 218         case ddpNBP:
 219                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 220                 break;
 221
 222         case ddpATP:
 223                 atp_print((const struct atATP *)bp, length);
 224                 break;
 225
 226         default:
 227                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 228                 break;
 229         }
 230 }
 231
 232 static void
 233 atp_print(register const struct atATP *ap, u_int length)
 234 {
 235         char c;
 236         u_int32_t data;
 237
 238         if ((const u_char *)(ap + 1) > snapend) {
 239                 /* Just bail if we don't have the whole chunk. */
 240                 fputs(tstr, stdout);
 241                 return;
 242         }
 243         length -= sizeof(*ap);
 244         switch (ap->control & 0xc0) {
 245
 246         case atpReqCode:
 247                 (void)printf(" atp-req%s %d",
 248                              ap->control & atpXO? " " : "*",
 249                              EXTRACT_16BITS(&ap->transID));
 250
 251                 atp_bitmap_print(ap->bitmap);
 252
 253                 if (length != 0)
 254                         (void)printf(" [len=%d]", length);
 255
 256                 switch (ap->control & (atpEOM|atpSTS)) {
 257                 case atpEOM:
 258                         (void)printf(" [EOM]");
 259                         break;
 260                 case atpSTS:
 261                         (void)printf(" [STS]");
 262                         break;
 263                 case atpEOM|atpSTS:
 264                         (void)printf(" [EOM,STS]");
 265                         break;
 266                 }
 267                 break;
 268
 269         case atpRspCode:
 270                 (void)printf(" atp-resp%s%d:%d (%d)",
 271                              ap->control & atpEOM? "*" : " ",
 272                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 273                 switch (ap->control & (atpXO|atpSTS)) {
 274                 case atpXO:
 275                         (void)printf(" [XO]");
 276                         break;
 277                 case atpSTS:
 278                         (void)printf(" [STS]");
 279                         break;
 280                 case atpXO|atpSTS:
 281                         (void)printf(" [XO,STS]");
 282                         break;
 283                 }
 284                 break;
 285
 286         case atpRelCode:
 287                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 288
 289                 atp_bitmap_print(ap->bitmap);
 290
 291                 /* length should be zero */
 292                 if (length)
 293                         (void)printf(" [len=%d]", length);
 294
 295                 /* there shouldn't be any control flags */
 296                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 297                         c = '[';
 298                         if (ap->control & atpXO) {
 299                                 (void)printf("%cXO", c);
 300                                 c = ',';
 301                         }
 302                         if (ap->control & atpEOM) {
 303                                 (void)printf("%cEOM", c);
 304                                 c = ',';
 305                         }
 306                         if (ap->control & atpSTS) {
 307                                 (void)printf("%cSTS", c);
 308                                 c = ',';
 309                         }
 310                         (void)printf("]");
 311                 }
 312                 break;
 313
 314         default:
 315                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 316                              EXTRACT_16BITS(&ap->transID), length);
 317                 break;
 318         }
 319         data = EXTRACT_32BITS(&ap->userData);
 320         if (data != 0)
 321                 (void)printf(" 0x%x", data);
 322 }
 323
 324 static void
 325 atp_bitmap_print(register u_char bm)
 326 {
 327         register char c;
 328         register int i;
 329
 330         /*
 331          * The '& 0xff' below is needed for compilers that want to sign
 332          * extend a u_char, which is the case with the Ultrix compiler.
 333          * (gcc is smart enough to eliminate it, at least on the Sparc).
 334          */
 335         if ((bm + 1) & (bm & 0xff)) {
 336                 c = '<';
 337                 for (i = 0; bm; ++i) {
 338                         if (bm & 1) {
 339                                 (void)printf("%c%d", c, i);
 340                                 c = ',';
 341                         }
 342                         bm >>= 1;
 343                 }
 344                 (void)printf(">");
 345         } else {
 346                 for (i = 0; bm; ++i)
 347                         bm >>= 1;
 348                 if (i > 1)
 349                         (void)printf("<0-%d>", i - 1);
 350                 else
 351                         (void)printf("<0>");
 352         }
 353 }
 354
 355 static void
 356 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 357           register u_char snode, register u_char skt)
 358 {
 359         register const struct atNBPtuple *tp =
 360                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 361         int i;
 362         const u_char *ep;
 363
 364         length -= nbpHeaderSize;
 365         if (length < 8) {
 366                 /* must be room for at least one tuple */
 367                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 368                 return;
 369         }
 370         /* ep points to end of available data */
 371         ep = snapend;
 372         if ((const u_char *)tp > ep) {
 373                 fputs(tstr, stdout);
 374                 return;
 375         }
 376         switch (i = np->control & 0xf0) {
 377
 378         case nbpBrRq:
 379         case nbpLkUp:
 380                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 381                              np->id);
 382                 if ((const u_char *)(tp + 1) > ep) {
 383                         fputs(tstr, stdout);
 384                         return;
 385                 }
 386                 (void)nbp_name_print(tp, ep);
 387                 /*
 388                  * look for anomalies: the spec says there can only
 389                  * be one tuple, the address must match the source
 390                  * address and the enumerator should be zero.
 391                  */
 392                 if ((np->control & 0xf) != 1)
 393                         (void)printf(" [ntup=%d]", np->control & 0xf);
 394                 if (tp->enumerator)
 395                         (void)printf(" [enum=%d]", tp->enumerator);
 396                 if (EXTRACT_16BITS(&tp->net) != snet ||
 397                     tp->node != snode || tp->skt != skt)
 398                         (void)printf(" [addr=%s.%d]",
 399                             ataddr_string(EXTRACT_16BITS(&tp->net),
 400                             tp->node), tp->skt);
 401                 break;
 402
 403         case nbpLkUpReply:
 404                 (void)printf(" nbp-reply %d:", np->id);
 405
 406                 /* print each of the tuples in the reply */
 407                 for (i = np->control & 0xf; --i >= 0 && tp; )
 408                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 409                 break;
 410
 411         default:
 412                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 413                                 length);
 414                 break;
 415         }
 416 }
 417
 418 /* print a counted string */
 419 static const char *
 420 print_cstring(register const char *cp, register const u_char *ep)
 421 {
 422         register u_int length;
 423
 424         if (cp >= (const char *)ep) {
 425                 fputs(tstr, stdout);
 426                 return (0);
 427         }
 428         length = *cp++;
 429
 430         /* Spec says string can be at most 32 bytes long */
 431         if (length > 32) {
 432                 (void)printf("[len=%u]", length);
 433                 return (0);
 434         }
 435         while ((int)--length >= 0) {
 436                 if (cp >= (char *)ep) {
 437                         fputs(tstr, stdout);
 438                         return (0);
 439                 }
 440                 putchar(*cp++);
 441         }
 442         return (cp);
 443 }
 444
 445 static const struct atNBPtuple *
 446 nbp_tuple_print(register const struct atNBPtuple *tp,
 447                 register const u_char *ep,
 448                 register u_short snet, register u_char snode,
 449                 register u_char skt)
 450 {
 451         register const struct atNBPtuple *tpn;
 452
 453         if ((const u_char *)(tp + 1) > ep) {
 454                 fputs(tstr, stdout);
 455                 return 0;
 456         }
 457         tpn = nbp_name_print(tp, ep);
 458
 459         /* if the enumerator isn't 1, print it */
 460         if (tp->enumerator != 1)
 461                 (void)printf("(%d)", tp->enumerator);
 462
 463         /* if the socket doesn't match the src socket, print it */
 464         if (tp->skt != skt)
 465                 (void)printf(" %d", tp->skt);
 466
 467         /* if the address doesn't match the src address, it's an anomaly */
 468         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 469                 (void)printf(" [addr=%s]",
 470                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 471
 472         return (tpn);
 473 }
 474
 475 static const struct atNBPtuple *
 476 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 477 {
 478         register const char *cp = (const char *)tp + nbpTupleSize;
 479
 480         putchar(' ');
 481
 482         /* Object */
 483         putchar('"');
 484         if ((cp = print_cstring(cp, ep)) != NULL) {
 485                 /* Type */
 486                 putchar(':');
 487                 if ((cp = print_cstring(cp, ep)) != NULL) {
 488                         /* Zone */
 489                         putchar('@');
 490                         if ((cp = print_cstring(cp, ep)) != NULL)
 491                                 putchar('"');
 492                 }
 493         }
 494         return ((const struct atNBPtuple *)cp);
 495 }
 496
 497
 498 #define HASHNAMESIZE 4096
 499
 500 struct hnamemem {
 501         int addr;
 502         char *name;
 503         struct hnamemem *nxt;
 504 };
 505
 506 static struct hnamemem hnametable[HASHNAMESIZE];
 507
 508 static const char *
 509 ataddr_string(u_short atnet, u_char athost)
 510 {
 511         register struct hnamemem *tp, *tp2;
 512         register int i = (atnet << 8) | athost;
 513         char nambuf[MAXHOSTNAMELEN + 20];
 514         static int first = 1;
 515         FILE *fp;
 516
 517         /*
 518          * if this is the first call, see if there's an AppleTalk
 519          * number to name map file.
 520          */
 521         if (first && (first = 0, !nflag)
 522             && (fp = fopen("/etc/atalk.names", "r"))) {
 523                 char line[256];
 524                 int i1, i2, i3;
 525
 526                 while (fgets(line, sizeof(line), fp)) {
 527                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 528                                 continue;
 529                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 530                                      nambuf) == 4)
 531                                 /* got a hostname. */
 532                                 i3 |= ((i1 << 8) | i2) << 8;
 533                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 534                                         nambuf) == 3)
 535                                 /* got a net name */
 536                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 537                         else
 538                                 continue;
 539
 540                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 541                              tp->nxt; tp = tp->nxt)
 542                                 ;
 543                         tp->addr = i3;
 544                         tp->nxt = newhnamemem();
 545                         tp->name = savestr(nambuf);
 546                 }
 547                 fclose(fp);
 548         }
 549
 550         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 551                 if (tp->addr == i)
 552                         return (tp->name);
 553
 554         /* didn't have the node name -- see if we've got the net name */
 555         i |= 255;
 556         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 557                 if (tp2->addr == i) {
 558                         tp->addr = (atnet << 8) | athost;
 559                         tp->nxt = newhnamemem();
 560                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 561                             tp2->name, athost);
 562                         tp->name = savestr(nambuf);
 563                         return (tp->name);
 564                 }
 565
 566         tp->addr = (atnet << 8) | athost;
 567         tp->nxt = newhnamemem();
 568         if (athost != 255)
 569                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 570                     atnet >> 8, atnet & 0xff, athost);
 571         else
 572                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 573                     atnet & 0xff);
 574         tp->name = savestr(nambuf);
 575
 576         return (tp->name);
 577 }
 578
 579 static struct tok skt2str[] = {
 580         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 581         { nbpSkt,       "nis" },        /* name info socket */
 582         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 583         { zipSkt,       "zip" },        /* zone info protocol */
 584         { 0,            NULL }
 585 };
 586
 587 static const char *
 588 ddpskt_string(register int skt)
 589 {
 590         static char buf[8];
 591
 592         if (nflag) {
 593                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 594                 return (buf);
 595         }
 596         return (tok2str(skt2str, "%d", skt));
 597 }