dist/tcpdump/print-atalk.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that: (1) source code distributions
   9  * retain the above copyright notice and this paragraph in its entirety, (2)
  10  * distributions including binary code include the above copyright notice and
  11  * this paragraph in its entirety in the documentation or other materials
  12  * provided with the distribution, and (3) all advertising materials mentioning
  13  * features or use of this software display the following acknowledgement:
  14  * ``This product includes software developed by the University of California,
  15  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  16  * the University nor the names of its contributors may be used to endorse
  17  * or promote products derived from this software without specific prior
  18  * written permission.
  19  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  20  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  21  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  22  *
  23  * Format and print AppleTalk packets.
  24  */
  25
  26 #include <sys/cdefs.h>
  27 #ifndef lint
  28 #if 0
  29 static const char rcsid[] _U_ =
  30     "@(#) Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.81 2004/05/01 09:41:50 hannes Exp (LBL)";
  31 #else
  32 __RCSID("$NetBSD: tcpdump2rcsid.ex,v 1.1 2001/06/25 20:09:58 itojun Exp $");
  33 #endif
  34 #endif
  35
  36 #ifdef HAVE_CONFIG_H
  37 #include "config.h"
  38 #endif
  39
  40 #include <tcpdump-stdinc.h>
  41
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <string.h>
  45 #include <pcap.h>
  46
  47 #include "interface.h"
  48 #include "addrtoname.h"
  49 #include "ethertype.h"
  50 #include "extract.h"                    /* must come after interface.h */
  51 #include "appletalk.h"
  52
  53 static struct tok type2str[] = {
  54         { ddpRTMP,              "rtmp" },
  55         { ddpRTMPrequest,       "rtmpReq" },
  56         { ddpECHO,              "echo" },
  57         { ddpIP,                "IP" },
  58         { ddpARP,               "ARP" },
  59         { ddpKLAP,              "KLAP" },
  60         { 0,                    NULL }
  61 };
  62
  63 struct aarp {
  64         u_int16_t       htype, ptype;
  65         u_int8_t        halen, palen;
  66         u_int16_t       op;
  67         u_int8_t        hsaddr[6];
  68         u_int8_t        psaddr[4];
  69         u_int8_t        hdaddr[6];
  70         u_int8_t        pdaddr[4];
  71 };
  72
  73 static char tstr[] = "[|atalk]";
  74
  75 static void atp_print(const struct atATP *, u_int);
  76 static void atp_bitmap_print(u_char);
  77 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  78 static const char *print_cstring(const char *, const u_char *);
  79 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  80                                                 const u_char *,
  81                                                 u_short, u_char, u_char);
  82 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  83                                                const u_char *);
  84 static const char *ataddr_string(u_short, u_char);
  85 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  86 static const char *ddpskt_string(int);
  87
  88 /*
  89  * Print LLAP packets received on a physical LocalTalk interface.
  90  */
  91 u_int
  92 ltalk_if_print(const struct pcap_pkthdr *h, const u_char *p)
  93 {
  94         return (llap_print(p, h->caplen));
  95 }
  96
  97 /*
  98  * Print AppleTalk LLAP packets.
  99  */
 100 u_int
 101 llap_print(register const u_char *bp, u_int length)
 102 {
 103         register const struct LAP *lp;
 104         register const struct atDDP *dp;
 105         register const struct atShortDDP *sdp;
 106         u_short snet;
 107         u_int hdrlen;
 108
 109         /*
 110          * Our packet is on a 4-byte boundary, as we're either called
 111          * directly from a top-level link-layer printer (ltalk_if_print)
 112          * or from the UDP printer.  The LLAP+DDP header is a multiple
 113          * of 4 bytes in length, so the DDP payload is also on a 4-byte
 114          * boundary, and we don't need to align it before calling
 115          * "ddp_print()".
 116          */
 117         lp = (const struct LAP *)bp;
 118         bp += sizeof(*lp);
 119         length -= sizeof(*lp);
 120         hdrlen = sizeof(*lp);
 121         switch (lp->type) {
 122
 123         case lapShortDDP:
 124                 if (length < ddpSSize) {
 125                         (void)printf(" [|sddp %d]", length);
 126                         return (length);
 127                 }
 128                 sdp = (const struct atShortDDP *)bp;
 129                 printf("%s.%s",
 130                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 131                 printf(" > %s.%s:",
 132                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 133                 bp += ddpSSize;
 134                 length -= ddpSSize;
 135                 hdrlen += ddpSSize;
 136                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 137                 break;
 138
 139         case lapDDP:
 140                 if (length < ddpSize) {
 141                         (void)printf(" [|ddp %d]", length);
 142                         return (length);
 143                 }
 144                 dp = (const struct atDDP *)bp;
 145                 snet = EXTRACT_16BITS(&dp->srcNet);
 146                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 147                     ddpskt_string(dp->srcSkt));
 148                 printf(" > %s.%s:",
 149                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 150                     ddpskt_string(dp->dstSkt));
 151                 bp += ddpSize;
 152                 length -= ddpSize;
 153                 hdrlen += ddpSize;
 154                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 155                 break;
 156
 157 #ifdef notdef
 158         case lapKLAP:
 159                 klap_print(bp, length);
 160                 break;
 161 #endif
 162
 163         default:
 164                 printf("%d > %d at-lap#%d %d",
 165                     lp->src, lp->dst, lp->type, length);
 166                 break;
 167         }
 168         return (hdrlen);
 169 }
 170
 171 /*
 172  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 173  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 174  * packets in them).
 175  */
 176 void
 177 atalk_print(register const u_char *bp, u_int length)
 178 {
 179         register const struct atDDP *dp;
 180         u_short snet;
 181
 182         if(!eflag)
 183             printf("AT ");
 184
 185         if (length < ddpSize) {
 186                 (void)printf(" [|ddp %d]", length);
 187                 return;
 188         }
 189         dp = (const struct atDDP *)bp;
 190         snet = EXTRACT_16BITS(&dp->srcNet);
 191         printf("%s.%s", ataddr_string(snet, dp->srcNode),
 192                ddpskt_string(dp->srcSkt));
 193         printf(" > %s.%s: ",
 194                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 195                ddpskt_string(dp->dstSkt));
 196         bp += ddpSize;
 197         length -= ddpSize;
 198         ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 199 }
 200
 201 /* XXX should probably pass in the snap header and do checks like arp_print() */
 202 void
 203 aarp_print(register const u_char *bp, u_int length)
 204 {
 205         register const struct aarp *ap;
 206
 207 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 208
 209         printf("aarp ");
 210         ap = (const struct aarp *)bp;
 211         if (EXTRACT_16BITS(&ap->htype) == 1 &&
 212             EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
 213             ap->halen == 6 && ap->palen == 4 )
 214                 switch (EXTRACT_16BITS(&ap->op)) {
 215
 216                 case 1:                         /* request */
 217                         (void)printf("who-has %s tell %s",
 218                             AT(pdaddr), AT(psaddr));
 219                         return;
 220
 221                 case 2:                         /* response */
 222                         (void)printf("reply %s is-at %s",
 223                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 224                         return;
 225
 226                 case 3:                         /* probe (oy!) */
 227                         (void)printf("probe %s tell %s",
 228                             AT(pdaddr), AT(psaddr));
 229                         return;
 230                 }
 231         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 232             length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
 233             EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen);
 234 }
 235
 236 /*
 237  * Print AppleTalk Datagram Delivery Protocol packets.
 238  */
 239 static void
 240 ddp_print(register const u_char *bp, register u_int length, register int t,
 241           register u_short snet, register u_char snode, u_char skt)
 242 {
 243
 244         switch (t) {
 245
 246         case ddpNBP:
 247                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 248                 break;
 249
 250         case ddpATP:
 251                 atp_print((const struct atATP *)bp, length);
 252                 break;
 253
 254         case ddpEIGRP:
 255                 eigrp_print(bp, length);
 256                 break;
 257
 258         default:
 259                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 260                 break;
 261         }
 262 }
 263
 264 static void
 265 atp_print(register const struct atATP *ap, u_int length)
 266 {
 267         char c;
 268         u_int32_t data;
 269
 270         if ((const u_char *)(ap + 1) > snapend) {
 271                 /* Just bail if we don't have the whole chunk. */
 272                 fputs(tstr, stdout);
 273                 return;
 274         }
 275         length -= sizeof(*ap);
 276         switch (ap->control & 0xc0) {
 277
 278         case atpReqCode:
 279                 (void)printf(" atp-req%s %d",
 280                              ap->control & atpXO? " " : "*",
 281                              EXTRACT_16BITS(&ap->transID));
 282
 283                 atp_bitmap_print(ap->bitmap);
 284
 285                 if (length != 0)
 286                         (void)printf(" [len=%d]", length);
 287
 288                 switch (ap->control & (atpEOM|atpSTS)) {
 289                 case atpEOM:
 290                         (void)printf(" [EOM]");
 291                         break;
 292                 case atpSTS:
 293                         (void)printf(" [STS]");
 294                         break;
 295                 case atpEOM|atpSTS:
 296                         (void)printf(" [EOM,STS]");
 297                         break;
 298                 }
 299                 break;
 300
 301         case atpRspCode:
 302                 (void)printf(" atp-resp%s%d:%d (%d)",
 303                              ap->control & atpEOM? "*" : " ",
 304                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 305                 switch (ap->control & (atpXO|atpSTS)) {
 306                 case atpXO:
 307                         (void)printf(" [XO]");
 308                         break;
 309                 case atpSTS:
 310                         (void)printf(" [STS]");
 311                         break;
 312                 case atpXO|atpSTS:
 313                         (void)printf(" [XO,STS]");
 314                         break;
 315                 }
 316                 break;
 317
 318         case atpRelCode:
 319                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 320
 321                 atp_bitmap_print(ap->bitmap);
 322
 323                 /* length should be zero */
 324                 if (length)
 325                         (void)printf(" [len=%d]", length);
 326
 327                 /* there shouldn't be any control flags */
 328                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 329                         c = '[';
 330                         if (ap->control & atpXO) {
 331                                 (void)printf("%cXO", c);
 332                                 c = ',';
 333                         }
 334                         if (ap->control & atpEOM) {
 335                                 (void)printf("%cEOM", c);
 336                                 c = ',';
 337                         }
 338                         if (ap->control & atpSTS) {
 339                                 (void)printf("%cSTS", c);
 340                                 c = ',';
 341                         }
 342                         (void)printf("]");
 343                 }
 344                 break;
 345
 346         default:
 347                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 348                              EXTRACT_16BITS(&ap->transID), length);
 349                 break;
 350         }
 351         data = EXTRACT_32BITS(&ap->userData);
 352         if (data != 0)
 353                 (void)printf(" 0x%x", data);
 354 }
 355
 356 static void
 357 atp_bitmap_print(register u_char bm)
 358 {
 359         register char c;
 360         register int i;
 361
 362         /*
 363          * The '& 0xff' below is needed for compilers that want to sign
 364          * extend a u_char, which is the case with the Ultrix compiler.
 365          * (gcc is smart enough to eliminate it, at least on the Sparc).
 366          */
 367         if ((bm + 1) & (bm & 0xff)) {
 368                 c = '<';
 369                 for (i = 0; bm; ++i) {
 370                         if (bm & 1) {
 371                                 (void)printf("%c%d", c, i);
 372                                 c = ',';
 373                         }
 374                         bm >>= 1;
 375                 }
 376                 (void)printf(">");
 377         } else {
 378                 for (i = 0; bm; ++i)
 379                         bm >>= 1;
 380                 if (i > 1)
 381                         (void)printf("<0-%d>", i - 1);
 382                 else
 383                         (void)printf("<0>");
 384         }
 385 }
 386
 387 static void
 388 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 389           register u_char snode, register u_char skt)
 390 {
 391         register const struct atNBPtuple *tp =
 392                 (const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 393         int i;
 394         const u_char *ep;
 395
 396         if (length < nbpHeaderSize) {
 397                 (void)printf(" truncated-nbp %d", length);
 398                 return;
 399         }
 400
 401         length -= nbpHeaderSize;
 402         if (length < 8) {
 403                 /* must be room for at least one tuple */
 404                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 405                 return;
 406         }
 407         /* ep points to end of available data */
 408         ep = snapend;
 409         if ((const u_char *)tp > ep) {
 410                 fputs(tstr, stdout);
 411                 return;
 412         }
 413         switch (i = np->control & 0xf0) {
 414
 415         case nbpBrRq:
 416         case nbpLkUp:
 417                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 418                              np->id);
 419                 if ((const u_char *)(tp + 1) > ep) {
 420                         fputs(tstr, stdout);
 421                         return;
 422                 }
 423                 (void)nbp_name_print(tp, ep);
 424                 /*
 425                  * look for anomalies: the spec says there can only
 426                  * be one tuple, the address must match the source
 427                  * address and the enumerator should be zero.
 428                  */
 429                 if ((np->control & 0xf) != 1)
 430                         (void)printf(" [ntup=%d]", np->control & 0xf);
 431                 if (tp->enumerator)
 432                         (void)printf(" [enum=%d]", tp->enumerator);
 433                 if (EXTRACT_16BITS(&tp->net) != snet ||
 434                     tp->node != snode || tp->skt != skt)
 435                         (void)printf(" [addr=%s.%d]",
 436                             ataddr_string(EXTRACT_16BITS(&tp->net),
 437                             tp->node), tp->skt);
 438                 break;
 439
 440         case nbpLkUpReply:
 441                 (void)printf(" nbp-reply %d:", np->id);
 442
 443                 /* print each of the tuples in the reply */
 444                 for (i = np->control & 0xf; --i >= 0 && tp; )
 445                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 446                 break;
 447
 448         default:
 449                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 450                                 length);
 451                 break;
 452         }
 453 }
 454
 455 /* print a counted string */
 456 static const char *
 457 print_cstring(register const char *cp, register const u_char *ep)
 458 {
 459         register u_int length;
 460
 461         if (cp >= (const char *)ep) {
 462                 fputs(tstr, stdout);
 463                 return (0);
 464         }
 465         length = *cp++;
 466
 467         /* Spec says string can be at most 32 bytes long */
 468         if (length > 32) {
 469                 (void)printf("[len=%u]", length);
 470                 return (0);
 471         }
 472         while ((int)--length >= 0) {
 473                 if (cp >= (const char *)ep) {
 474                         fputs(tstr, stdout);
 475                         return (0);
 476                 }
 477                 putchar(*cp++);
 478         }
 479         return (cp);
 480 }
 481
 482 static const struct atNBPtuple *
 483 nbp_tuple_print(register const struct atNBPtuple *tp,
 484                 register const u_char *ep,
 485                 register u_short snet, register u_char snode,
 486                 register u_char skt)
 487 {
 488         register const struct atNBPtuple *tpn;
 489
 490         if ((const u_char *)(tp + 1) > ep) {
 491                 fputs(tstr, stdout);
 492                 return 0;
 493         }
 494         tpn = nbp_name_print(tp, ep);
 495
 496         /* if the enumerator isn't 1, print it */
 497         if (tp->enumerator != 1)
 498                 (void)printf("(%d)", tp->enumerator);
 499
 500         /* if the socket doesn't match the src socket, print it */
 501         if (tp->skt != skt)
 502                 (void)printf(" %d", tp->skt);
 503
 504         /* if the address doesn't match the src address, it's an anomaly */
 505         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 506                 (void)printf(" [addr=%s]",
 507                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 508
 509         return (tpn);
 510 }
 511
 512 static const struct atNBPtuple *
 513 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 514 {
 515         register const char *cp = (const char *)tp + nbpTupleSize;
 516
 517         putchar(' ');
 518
 519         /* Object */
 520         putchar('"');
 521         if ((cp = print_cstring(cp, ep)) != NULL) {
 522                 /* Type */
 523                 putchar(':');
 524                 if ((cp = print_cstring(cp, ep)) != NULL) {
 525                         /* Zone */
 526                         putchar('@');
 527                         if ((cp = print_cstring(cp, ep)) != NULL)
 528                                 putchar('"');
 529                 }
 530         }
 531         return ((const struct atNBPtuple *)cp);
 532 }
 533
 534
 535 #define HASHNAMESIZE 4096
 536
 537 struct hnamemem {
 538         int addr;
 539         char *name;
 540         struct hnamemem *nxt;
 541 };
 542
 543 static struct hnamemem hnametable[HASHNAMESIZE];
 544
 545 static const char *
 546 ataddr_string(u_short atnet, u_char athost)
 547 {
 548         register struct hnamemem *tp, *tp2;
 549         register int i = (atnet << 8) | athost;
 550         char nambuf[MAXHOSTNAMELEN + 20];
 551         static int first = 1;
 552         FILE *fp;
 553
 554         /*
 555          * if this is the first call, see if there's an AppleTalk
 556          * number to name map file.
 557          */
 558         if (first && (first = 0, !nflag)
 559             && (fp = fopen("/etc/atalk.names", "r"))) {
 560                 char line[256];
 561                 int i1, i2, i3;
 562
 563                 while (fgets(line, sizeof(line), fp)) {
 564                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 565                                 continue;
 566                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 567                                      nambuf) == 4)
 568                                 /* got a hostname. */
 569                                 i3 |= ((i1 << 8) | i2) << 8;
 570                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 571                                         nambuf) == 3)
 572                                 /* got a net name */
 573                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 574                         else
 575                                 continue;
 576
 577                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 578                              tp->nxt; tp = tp->nxt)
 579                                 ;
 580                         tp->addr = i3;
 581                         tp->nxt = newhnamemem();
 582                         tp->name = strdup(nambuf);
 583                 }
 584                 fclose(fp);
 585         }
 586
 587         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 588                 if (tp->addr == i)
 589                         return (tp->name);
 590
 591         /* didn't have the node name -- see if we've got the net name */
 592         i |= 255;
 593         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 594                 if (tp2->addr == i) {
 595                         tp->addr = (atnet << 8) | athost;
 596                         tp->nxt = newhnamemem();
 597                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 598                             tp2->name, athost);
 599                         tp->name = strdup(nambuf);
 600                         return (tp->name);
 601                 }
 602
 603         tp->addr = (atnet << 8) | athost;
 604         tp->nxt = newhnamemem();
 605         if (athost != 255)
 606                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 607                     atnet >> 8, atnet & 0xff, athost);
 608         else
 609                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 610                     atnet & 0xff);
 611         tp->name = strdup(nambuf);
 612
 613         return (tp->name);
 614 }
 615
 616 static struct tok skt2str[] = {
 617         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 618         { nbpSkt,       "nis" },        /* name info socket */
 619         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 620         { zipSkt,       "zip" },        /* zone info protocol */
 621         { 0,            NULL }
 622 };
 623
 624 static const char *
 625 ddpskt_string(register int skt)
 626 {
 627         static char buf[8];
 628
 629         if (nflag) {
 630                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 631                 return (buf);
 632         }
 633         return (tok2str(skt2str, "%d", skt));
 634 }