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 1.60 2000-10-05 04:10:01 itojun 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 #if __STDC__
  38 struct mbuf;
  39 struct rtentry;
  40 #endif
  41
  42 #include <netinet/in.h>
  43
  44 #include <stdio.h>
  45 #include <stdlib.h>
  46 #include <string.h>
  47
  48 #include "interface.h"
  49 #include "addrtoname.h"
  50 #include "ethertype.h"
  51 #include "extract.h"                    /* must come after interface.h */
  52 #include "appletalk.h"
  53 #include "savestr.h"
  54
  55 static struct tok type2str[] = {
  56         { ddpRTMP,              "rtmp" },
  57         { ddpRTMPrequest,       "rtmpReq" },
  58         { ddpECHO,              "echo" },
  59         { ddpIP,                "IP" },
  60         { ddpARP,               "ARP" },
  61         { ddpKLAP,              "KLAP" },
  62         { 0,                    NULL }
  63 };
  64
  65 struct aarp {
  66         u_int16_t       htype, ptype;
  67         u_int8_t        halen, palen;
  68         u_int16_t       op;
  69         u_int8_t        hsaddr[6];
  70         u_int8_t        psaddr[4];
  71         u_int8_t        hdaddr[6];
  72         u_int8_t        pdaddr[4];
  73 };
  74
  75 static char tstr[] = "[|atalk]";
  76
  77 static void atp_print(const struct atATP *, u_int);
  78 static void atp_bitmap_print(u_char);
  79 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  80 static const char *print_cstring(const char *, const u_char *);
  81 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  82                                                 const u_char *,
  83                                                 u_short, u_char, u_char);
  84 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  85                                                const u_char *);
  86 static const char *ataddr_string(u_short, u_char);
  87 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  88 static const char *ddpskt_string(int);
  89
  90 /*
  91  * Print AppleTalk Datagram Delivery Protocol packets.
  92  */
  93 void
  94 atalk_print(register const u_char *bp, u_int length)
  95 {
  96         register const struct LAP *lp;
  97         register const struct atDDP *dp;
  98         register const struct atShortDDP *sdp;
  99         u_short snet;
 100
 101         lp = (struct LAP *)bp;
 102         bp += sizeof(*lp);
 103         length -= sizeof(*lp);
 104         switch (lp->type) {
 105
 106         case lapShortDDP:
 107                 if (length < ddpSSize) {
 108                         (void)printf(" [|sddp %d]", length);
 109                         return;
 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                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 119                 break;
 120
 121         case lapDDP:
 122                 if (length < ddpSize) {
 123                         (void)printf(" [|ddp %d]", length);
 124                         return;
 125                 }
 126                 dp = (const struct atDDP *)bp;
 127                 snet = EXTRACT_16BITS(&dp->srcNet);
 128                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 129                     ddpskt_string(dp->srcSkt));
 130                 printf(" > %s.%s:",
 131                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 132                     ddpskt_string(dp->dstSkt));
 133                 bp += ddpSize;
 134                 length -= ddpSize;
 135                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 136                 break;
 137
 138 #ifdef notdef
 139         case lapKLAP:
 140                 klap_print(bp, length);
 141                 break;
 142 #endif
 143
 144         default:
 145                 printf("%d > %d at-lap#%d %d",
 146                     lp->src, lp->dst, lp->type, length);
 147                 break;
 148         }
 149 }
 150
 151 /* XXX should probably pass in the snap header and do checks like arp_print() */
 152 void
 153 aarp_print(register const u_char *bp, u_int length)
 154 {
 155         register const struct aarp *ap;
 156
 157 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 158
 159         printf("aarp ");
 160         ap = (const struct aarp *)bp;
 161         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 162             ap->halen == 6 && ap->palen == 4 )
 163                 switch (ntohs(ap->op)) {
 164
 165                 case 1:                         /* request */
 166                         (void)printf("who-has %s tell %s",
 167                             AT(pdaddr), AT(psaddr));
 168                         return;
 169
 170                 case 2:                         /* response */
 171                         (void)printf("reply %s is-at %s",
 172                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 173                         return;
 174
 175                 case 3:                         /* probe (oy!) */
 176                         (void)printf("probe %s tell %s",
 177                             AT(pdaddr), AT(psaddr));
 178                         return;
 179                 }
 180         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 181             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 182             ap->halen, ap->palen);
 183 }
 184
 185 static void
 186 ddp_print(register const u_char *bp, register u_int length, register int t,
 187           register u_short snet, register u_char snode, u_char skt)
 188 {
 189
 190         switch (t) {
 191
 192         case ddpNBP:
 193                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 194                 break;
 195
 196         case ddpATP:
 197                 atp_print((const struct atATP *)bp, length);
 198                 break;
 199
 200         default:
 201                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 202                 break;
 203         }
 204 }
 205
 206 static void
 207 atp_print(register const struct atATP *ap, u_int length)
 208 {
 209         char c;
 210         u_int32_t data;
 211
 212         if ((const u_char *)(ap + 1) > snapend) {
 213                 /* Just bail if we don't have the whole chunk. */
 214                 fputs(tstr, stdout);
 215                 return;
 216         }
 217         length -= sizeof(*ap);
 218         switch (ap->control & 0xc0) {
 219
 220         case atpReqCode:
 221                 (void)printf(" atp-req%s %d",
 222                              ap->control & atpXO? " " : "*",
 223                              EXTRACT_16BITS(&ap->transID));
 224
 225                 atp_bitmap_print(ap->bitmap);
 226
 227                 if (length != 0)
 228                         (void)printf(" [len=%d]", length);
 229
 230                 switch (ap->control & (atpEOM|atpSTS)) {
 231                 case atpEOM:
 232                         (void)printf(" [EOM]");
 233                         break;
 234                 case atpSTS:
 235                         (void)printf(" [STS]");
 236                         break;
 237                 case atpEOM|atpSTS:
 238                         (void)printf(" [EOM,STS]");
 239                         break;
 240                 }
 241                 break;
 242
 243         case atpRspCode:
 244                 (void)printf(" atp-resp%s%d:%d (%d)",
 245                              ap->control & atpEOM? "*" : " ",
 246                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 247                 switch (ap->control & (atpXO|atpSTS)) {
 248                 case atpXO:
 249                         (void)printf(" [XO]");
 250                         break;
 251                 case atpSTS:
 252                         (void)printf(" [STS]");
 253                         break;
 254                 case atpXO|atpSTS:
 255                         (void)printf(" [XO,STS]");
 256                         break;
 257                 }
 258                 break;
 259
 260         case atpRelCode:
 261                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 262
 263                 atp_bitmap_print(ap->bitmap);
 264
 265                 /* length should be zero */
 266                 if (length)
 267                         (void)printf(" [len=%d]", length);
 268
 269                 /* there shouldn't be any control flags */
 270                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 271                         c = '[';
 272                         if (ap->control & atpXO) {
 273                                 (void)printf("%cXO", c);
 274                                 c = ',';
 275                         }
 276                         if (ap->control & atpEOM) {
 277                                 (void)printf("%cEOM", c);
 278                                 c = ',';
 279                         }
 280                         if (ap->control & atpSTS) {
 281                                 (void)printf("%cSTS", c);
 282                                 c = ',';
 283                         }
 284                         (void)printf("]");
 285                 }
 286                 break;
 287
 288         default:
 289                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 290                              EXTRACT_16BITS(&ap->transID), length);
 291                 break;
 292         }
 293         data = EXTRACT_32BITS(&ap->userData);
 294         if (data != 0)
 295                 (void)printf(" 0x%x", data);
 296 }
 297
 298 static void
 299 atp_bitmap_print(register u_char bm)
 300 {
 301         register char c;
 302         register int i;
 303
 304         /*
 305          * The '& 0xff' below is needed for compilers that want to sign
 306          * extend a u_char, which is the case with the Ultrix compiler.
 307          * (gcc is smart enough to eliminate it, at least on the Sparc).
 308          */
 309         if ((bm + 1) & (bm & 0xff)) {
 310                 c = '<';
 311                 for (i = 0; bm; ++i) {
 312                         if (bm & 1) {
 313                                 (void)printf("%c%d", c, i);
 314                                 c = ',';
 315                         }
 316                         bm >>= 1;
 317                 }
 318                 (void)printf(">");
 319         } else {
 320                 for (i = 0; bm; ++i)
 321                         bm >>= 1;
 322                 if (i > 1)
 323                         (void)printf("<0-%d>", i - 1);
 324                 else
 325                         (void)printf("<0>");
 326         }
 327 }
 328
 329 static void
 330 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 331           register u_char snode, register u_char skt)
 332 {
 333         register const struct atNBPtuple *tp =
 334                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 335         int i;
 336         const u_char *ep;
 337
 338         length -= nbpHeaderSize;
 339         if (length < 8) {
 340                 /* must be room for at least one tuple */
 341                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 342                 return;
 343         }
 344         /* ep points to end of available data */
 345         ep = snapend;
 346         if ((const u_char *)tp > ep) {
 347                 fputs(tstr, stdout);
 348                 return;
 349         }
 350         switch (i = np->control & 0xf0) {
 351
 352         case nbpBrRq:
 353         case nbpLkUp:
 354                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 355                              np->id);
 356                 if ((const u_char *)(tp + 1) > ep) {
 357                         fputs(tstr, stdout);
 358                         return;
 359                 }
 360                 (void)nbp_name_print(tp, ep);
 361                 /*
 362                  * look for anomalies: the spec says there can only
 363                  * be one tuple, the address must match the source
 364                  * address and the enumerator should be zero.
 365                  */
 366                 if ((np->control & 0xf) != 1)
 367                         (void)printf(" [ntup=%d]", np->control & 0xf);
 368                 if (tp->enumerator)
 369                         (void)printf(" [enum=%d]", tp->enumerator);
 370                 if (EXTRACT_16BITS(&tp->net) != snet ||
 371                     tp->node != snode || tp->skt != skt)
 372                         (void)printf(" [addr=%s.%d]",
 373                             ataddr_string(EXTRACT_16BITS(&tp->net),
 374                             tp->node), tp->skt);
 375                 break;
 376
 377         case nbpLkUpReply:
 378                 (void)printf(" nbp-reply %d:", np->id);
 379
 380                 /* print each of the tuples in the reply */
 381                 for (i = np->control & 0xf; --i >= 0 && tp; )
 382                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 383                 break;
 384
 385         default:
 386                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 387                                 length);
 388                 break;
 389         }
 390 }
 391
 392 /* print a counted string */
 393 static const char *
 394 print_cstring(register const char *cp, register const u_char *ep)
 395 {
 396         register u_int length;
 397
 398         if (cp >= (const char *)ep) {
 399                 fputs(tstr, stdout);
 400                 return (0);
 401         }
 402         length = *cp++;
 403
 404         /* Spec says string can be at most 32 bytes long */
 405         if (length > 32) {
 406                 (void)printf("[len=%u]", length);
 407                 return (0);
 408         }
 409         while ((int)--length >= 0) {
 410                 if (cp >= (char *)ep) {
 411                         fputs(tstr, stdout);
 412                         return (0);
 413                 }
 414                 putchar(*cp++);
 415         }
 416         return (cp);
 417 }
 418
 419 static const struct atNBPtuple *
 420 nbp_tuple_print(register const struct atNBPtuple *tp,
 421                 register const u_char *ep,
 422                 register u_short snet, register u_char snode,
 423                 register u_char skt)
 424 {
 425         register const struct atNBPtuple *tpn;
 426
 427         if ((const u_char *)(tp + 1) > ep) {
 428                 fputs(tstr, stdout);
 429                 return 0;
 430         }
 431         tpn = nbp_name_print(tp, ep);
 432
 433         /* if the enumerator isn't 1, print it */
 434         if (tp->enumerator != 1)
 435                 (void)printf("(%d)", tp->enumerator);
 436
 437         /* if the socket doesn't match the src socket, print it */
 438         if (tp->skt != skt)
 439                 (void)printf(" %d", tp->skt);
 440
 441         /* if the address doesn't match the src address, it's an anomaly */
 442         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 443                 (void)printf(" [addr=%s]",
 444                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 445
 446         return (tpn);
 447 }
 448
 449 static const struct atNBPtuple *
 450 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 451 {
 452         register const char *cp = (const char *)tp + nbpTupleSize;
 453
 454         putchar(' ');
 455
 456         /* Object */
 457         putchar('"');
 458         if ((cp = print_cstring(cp, ep)) != NULL) {
 459                 /* Type */
 460                 putchar(':');
 461                 if ((cp = print_cstring(cp, ep)) != NULL) {
 462                         /* Zone */
 463                         putchar('@');
 464                         if ((cp = print_cstring(cp, ep)) != NULL)
 465                                 putchar('"');
 466                 }
 467         }
 468         return ((const struct atNBPtuple *)cp);
 469 }
 470
 471
 472 #define HASHNAMESIZE 4096
 473
 474 struct hnamemem {
 475         int addr;
 476         char *name;
 477         struct hnamemem *nxt;
 478 };
 479
 480 static struct hnamemem hnametable[HASHNAMESIZE];
 481
 482 static const char *
 483 ataddr_string(u_short atnet, u_char athost)
 484 {
 485         register struct hnamemem *tp, *tp2;
 486         register int i = (atnet << 8) | athost;
 487         char nambuf[MAXHOSTNAMELEN + 20];
 488         static int first = 1;
 489         FILE *fp;
 490
 491         /*
 492          * if this is the first call, see if there's an AppleTalk
 493          * number to name map file.
 494          */
 495         if (first && (first = 0, !nflag)
 496             && (fp = fopen("/etc/atalk.names", "r"))) {
 497                 char line[256];
 498                 int i1, i2, i3;
 499
 500                 while (fgets(line, sizeof(line), fp)) {
 501                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 502                                 continue;
 503                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 504                                      nambuf) == 4)
 505                                 /* got a hostname. */
 506                                 i3 |= ((i1 << 8) | i2) << 8;
 507                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 508                                         nambuf) == 3)
 509                                 /* got a net name */
 510                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 511                         else
 512                                 continue;
 513
 514                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 515                              tp->nxt; tp = tp->nxt)
 516                                 ;
 517                         tp->addr = i3;
 518                         tp->nxt = newhnamemem();
 519                         tp->name = savestr(nambuf);
 520                 }
 521                 fclose(fp);
 522         }
 523
 524         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 525                 if (tp->addr == i)
 526                         return (tp->name);
 527
 528         /* didn't have the node name -- see if we've got the net name */
 529         i |= 255;
 530         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 531                 if (tp2->addr == i) {
 532                         tp->addr = (atnet << 8) | athost;
 533                         tp->nxt = newhnamemem();
 534                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 535                             tp2->name, athost);
 536                         tp->name = savestr(nambuf);
 537                         return (tp->name);
 538                 }
 539
 540         tp->addr = (atnet << 8) | athost;
 541         tp->nxt = newhnamemem();
 542         if (athost != 255)
 543                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 544                     atnet >> 8, atnet & 0xff, athost);
 545         else
 546                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 547                     atnet & 0xff);
 548         tp->name = savestr(nambuf);
 549
 550         return (tp->name);
 551 }
 552
 553 static struct tok skt2str[] = {
 554         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 555         { nbpSkt,       "nis" },        /* name info socket */
 556         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 557         { zipSkt,       "zip" },        /* zone info protocol */
 558         { 0,            NULL }
 559 };
 560
 561 static const char *
 562 ddpskt_string(register int skt)
 563 {
 564         static char buf[8];
 565
 566         if (nflag) {
 567                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 568                 return (buf);
 569         }
 570         return (tok2str(skt2str, "%d", skt));
 571 }