contrib/tcpdump/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  * $FreeBSD$
  24  */
  25
  26 #ifndef lint
  27 static const char rcsid[] _U_ =
  28     "@(#) $Header: /tcpdump/master/tcpdump/print-atalk.c,v 1.81 2004/05/01 09:41:50 hannes Exp $ (LBL)";
  29 #endif
  30
  31 #ifdef HAVE_CONFIG_H
  32 #include "config.h"
  33 #endif
  34
  35 #include <tcpdump-stdinc.h>
  36
  37 #include <stdio.h>
  38 #include <stdlib.h>
  39 #include <string.h>
  40 #include <pcap.h>
  41
  42 #include "interface.h"
  43 #include "addrtoname.h"
  44 #include "ethertype.h"
  45 #include "extract.h"                    /* must come after interface.h */
  46 #include "appletalk.h"
  47
  48 static struct tok type2str[] = {
  49         { ddpRTMP,              "rtmp" },
  50         { ddpRTMPrequest,       "rtmpReq" },
  51         { ddpECHO,              "echo" },
  52         { ddpIP,                "IP" },
  53         { ddpARP,               "ARP" },
  54         { ddpKLAP,              "KLAP" },
  55         { 0,                    NULL }
  56 };
  57
  58 struct aarp {
  59         u_int16_t       htype, ptype;
  60         u_int8_t        halen, palen;
  61         u_int16_t       op;
  62         u_int8_t        hsaddr[6];
  63         u_int8_t        psaddr[4];
  64         u_int8_t        hdaddr[6];
  65         u_int8_t        pdaddr[4];
  66 };
  67
  68 static char tstr[] = "[|atalk]";
  69
  70 static void atp_print(const struct atATP *, u_int);
  71 static void atp_bitmap_print(u_char);
  72 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  73 static const char *print_cstring(const char *, const u_char *);
  74 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  75                                                 const u_char *,
  76                                                 u_short, u_char, u_char);
  77 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  78                                                const u_char *);
  79 static const char *ataddr_string(u_short, u_char);
  80 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  81 static const char *ddpskt_string(int);
  82
  83 /*
  84  * Print LLAP packets received on a physical LocalTalk interface.
  85  */
  86 u_int
  87 ltalk_if_print(const struct pcap_pkthdr *h, const u_char *p)
  88 {
  89         return (llap_print(p, h->caplen));
  90 }
  91
  92 /*
  93  * Print AppleTalk LLAP packets.
  94  */
  95 u_int
  96 llap_print(register const u_char *bp, u_int length)
  97 {
  98         register const struct LAP *lp;
  99         register const struct atDDP *dp;
 100         register const struct atShortDDP *sdp;
 101         u_short snet;
 102         u_int hdrlen;
 103
 104 #if 0
 105         /*
 106          * Our packet is on a 4-byte boundary, as we're either called
 107          * directly from a top-level link-layer printer (ltalk_if_print)
 108          * or from the UDP printer.  The LLAP+DDP header is a multiple
 109          * of 4 bytes in length, so the DDP payload is also on a 4-byte
 110          * boundary, and we don't need to align it before calling
 111          * "ddp_print()".
 112          */
 113         lp = (const struct LAP *)bp;
 114         bp += sizeof(*lp);
 115         length -= sizeof(*lp);
 116 #else
 117         {
 118                 static struct LAP lp_ = {0, 0, lapDDP};
 119                 lp = &lp_;
 120         }
 121 #endif
 122         hdrlen = sizeof(*lp);
 123         switch (lp->type) {
 124
 125         case lapShortDDP:
 126                 if (length < ddpSSize) {
 127                         (void)printf(" [|sddp %d]", length);
 128                         return (length);
 129                 }
 130                 sdp = (const struct atShortDDP *)bp;
 131                 printf("%s.%s",
 132                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 133                 printf(" > %s.%s:",
 134                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 135                 bp += ddpSSize;
 136                 length -= ddpSSize;
 137                 hdrlen += ddpSSize;
 138                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 139                 break;
 140
 141         case lapDDP:
 142                 if (length < ddpSize) {
 143                         (void)printf(" [|ddp %d]", length);
 144                         return (length);
 145                 }
 146                 dp = (const struct atDDP *)bp;
 147                 snet = EXTRACT_16BITS(&dp->srcNet);
 148                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 149                     ddpskt_string(dp->srcSkt));
 150                 printf(" > %s.%s:",
 151                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 152                     ddpskt_string(dp->dstSkt));
 153                 bp += ddpSize;
 154                 length -= ddpSize;
 155                 hdrlen += ddpSize;
 156                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 157                 break;
 158
 159 #ifdef notdef
 160         case lapKLAP:
 161                 klap_print(bp, length);
 162                 break;
 163 #endif
 164
 165         default:
 166                 printf("%d > %d at-lap#%d %d",
 167                     lp->src, lp->dst, lp->type, length);
 168                 break;
 169         }
 170         return (hdrlen);
 171 }
 172
 173 /*
 174  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 175  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 176  * packets in them).
 177  */
 178 void
 179 atalk_print(register const u_char *bp, u_int length)
 180 {
 181         register const struct atDDP *dp;
 182         u_short snet;
 183
 184         if(!eflag)
 185             printf("AT ");
 186
 187         if (length < ddpSize) {
 188                 (void)printf(" [|ddp %d]", length);
 189                 return;
 190         }
 191         dp = (const struct atDDP *)bp;
 192         snet = EXTRACT_16BITS(&dp->srcNet);
 193         printf("%s.%s", ataddr_string(snet, dp->srcNode),
 194                ddpskt_string(dp->srcSkt));
 195         printf(" > %s.%s: ",
 196                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 197                ddpskt_string(dp->dstSkt));
 198         bp += ddpSize;
 199         length -= ddpSize;
 200         ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 201 }
 202
 203 /* XXX should probably pass in the snap header and do checks like arp_print() */
 204 void
 205 aarp_print(register const u_char *bp, u_int length)
 206 {
 207         register const struct aarp *ap;
 208
 209 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 210
 211         printf("aarp ");
 212         ap = (const struct aarp *)bp;
 213         if (EXTRACT_16BITS(&ap->htype) == 1 &&
 214             EXTRACT_16BITS(&ap->ptype) == ETHERTYPE_ATALK &&
 215             ap->halen == 6 && ap->palen == 4 )
 216                 switch (EXTRACT_16BITS(&ap->op)) {
 217
 218                 case 1:                         /* request */
 219                         (void)printf("who-has %s tell %s",
 220                             AT(pdaddr), AT(psaddr));
 221                         return;
 222
 223                 case 2:                         /* response */
 224                         (void)printf("reply %s is-at %s",
 225                             AT(psaddr), etheraddr_string(ap->hsaddr));
 226                         return;
 227
 228                 case 3:                         /* probe (oy!) */
 229                         (void)printf("probe %s tell %s",
 230                             AT(pdaddr), AT(psaddr));
 231                         return;
 232                 }
 233         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 234             length, EXTRACT_16BITS(&ap->op), EXTRACT_16BITS(&ap->htype),
 235             EXTRACT_16BITS(&ap->ptype), ap->halen, ap->palen);
 236 }
 237
 238 /*
 239  * Print AppleTalk Datagram Delivery Protocol packets.
 240  */
 241 static void
 242 ddp_print(register const u_char *bp, register u_int length, register int t,
 243           register u_short snet, register u_char snode, u_char skt)
 244 {
 245
 246         switch (t) {
 247
 248         case ddpNBP:
 249                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 250                 break;
 251
 252         case ddpATP:
 253                 atp_print((const struct atATP *)bp, length);
 254                 break;
 255
 256         case ddpEIGRP:
 257                 eigrp_print(bp, length);
 258                 break;
 259
 260         default:
 261                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 262                 break;
 263         }
 264 }
 265
 266 static void
 267 atp_print(register const struct atATP *ap, u_int length)
 268 {
 269         char c;
 270         u_int32_t data;
 271
 272         if ((const u_char *)(ap + 1) > snapend) {
 273                 /* Just bail if we don't have the whole chunk. */
 274                 fputs(tstr, stdout);
 275                 return;
 276         }
 277         length -= sizeof(*ap);
 278         switch (ap->control & 0xc0) {
 279
 280         case atpReqCode:
 281                 (void)printf(" atp-req%s %d",
 282                              ap->control & atpXO? " " : "*",
 283                              EXTRACT_16BITS(&ap->transID));
 284
 285                 atp_bitmap_print(ap->bitmap);
 286
 287                 if (length != 0)
 288                         (void)printf(" [len=%d]", length);
 289
 290                 switch (ap->control & (atpEOM|atpSTS)) {
 291                 case atpEOM:
 292                         (void)printf(" [EOM]");
 293                         break;
 294                 case atpSTS:
 295                         (void)printf(" [STS]");
 296                         break;
 297                 case atpEOM|atpSTS:
 298                         (void)printf(" [EOM,STS]");
 299                         break;
 300                 }
 301                 break;
 302
 303         case atpRspCode:
 304                 (void)printf(" atp-resp%s%d:%d (%d)",
 305                              ap->control & atpEOM? "*" : " ",
 306                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 307                 switch (ap->control & (atpXO|atpSTS)) {
 308                 case atpXO:
 309                         (void)printf(" [XO]");
 310                         break;
 311                 case atpSTS:
 312                         (void)printf(" [STS]");
 313                         break;
 314                 case atpXO|atpSTS:
 315                         (void)printf(" [XO,STS]");
 316                         break;
 317                 }
 318                 break;
 319
 320         case atpRelCode:
 321                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 322
 323                 atp_bitmap_print(ap->bitmap);
 324
 325                 /* length should be zero */
 326                 if (length)
 327                         (void)printf(" [len=%d]", length);
 328
 329                 /* there shouldn't be any control flags */
 330                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 331                         c = '[';
 332                         if (ap->control & atpXO) {
 333                                 (void)printf("%cXO", c);
 334                                 c = ',';
 335                         }
 336                         if (ap->control & atpEOM) {
 337                                 (void)printf("%cEOM", c);
 338                                 c = ',';
 339                         }
 340                         if (ap->control & atpSTS) {
 341                                 (void)printf("%cSTS", c);
 342                                 c = ',';
 343                         }
 344                         (void)printf("]");
 345                 }
 346                 break;
 347
 348         default:
 349                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 350                              EXTRACT_16BITS(&ap->transID), length);
 351                 break;
 352         }
 353         data = EXTRACT_32BITS(&ap->userData);
 354         if (data != 0)
 355                 (void)printf(" 0x%x", data);
 356 }
 357
 358 static void
 359 atp_bitmap_print(register u_char bm)
 360 {
 361         register char c;
 362         register int i;
 363
 364         /*
 365          * The '& 0xff' below is needed for compilers that want to sign
 366          * extend a u_char, which is the case with the Ultrix compiler.
 367          * (gcc is smart enough to eliminate it, at least on the Sparc).
 368          */
 369         if ((bm + 1) & (bm & 0xff)) {
 370                 c = '<';
 371                 for (i = 0; bm; ++i) {
 372                         if (bm & 1) {
 373                                 (void)printf("%c%d", c, i);
 374                                 c = ',';
 375                         }
 376                         bm >>= 1;
 377                 }
 378                 (void)printf(">");
 379         } else {
 380                 for (i = 0; bm; ++i)
 381                         bm >>= 1;
 382                 if (i > 1)
 383                         (void)printf("<0-%d>", i - 1);
 384                 else
 385                         (void)printf("<0>");
 386         }
 387 }
 388
 389 static void
 390 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 391           register u_char snode, register u_char skt)
 392 {
 393         register const struct atNBPtuple *tp =
 394                 (const struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 395         int i;
 396         const u_char *ep;
 397
 398         if (length < nbpHeaderSize) {
 399                 (void)printf(" truncated-nbp %d", length);
 400                 return;
 401         }
 402
 403         length -= nbpHeaderSize;
 404         if (length < 8) {
 405                 /* must be room for at least one tuple */
 406                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 407                 return;
 408         }
 409         /* ep points to end of available data */
 410         ep = snapend;
 411         if ((const u_char *)tp > ep) {
 412                 fputs(tstr, stdout);
 413                 return;
 414         }
 415         switch (i = np->control & 0xf0) {
 416
 417         case nbpBrRq:
 418         case nbpLkUp:
 419                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 420                              np->id);
 421                 if ((const u_char *)(tp + 1) > ep) {
 422                         fputs(tstr, stdout);
 423                         return;
 424                 }
 425                 (void)nbp_name_print(tp, ep);
 426                 /*
 427                  * look for anomalies: the spec says there can only
 428                  * be one tuple, the address must match the source
 429                  * address and the enumerator should be zero.
 430                  */
 431                 if ((np->control & 0xf) != 1)
 432                         (void)printf(" [ntup=%d]", np->control & 0xf);
 433                 if (tp->enumerator)
 434                         (void)printf(" [enum=%d]", tp->enumerator);
 435                 if (EXTRACT_16BITS(&tp->net) != snet ||
 436                     tp->node != snode || tp->skt != skt)
 437                         (void)printf(" [addr=%s.%d]",
 438                             ataddr_string(EXTRACT_16BITS(&tp->net),
 439                             tp->node), tp->skt);
 440                 break;
 441
 442         case nbpLkUpReply:
 443                 (void)printf(" nbp-reply %d:", np->id);
 444
 445                 /* print each of the tuples in the reply */
 446                 for (i = np->control & 0xf; --i >= 0 && tp; )
 447                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 448                 break;
 449
 450         default:
 451                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 452                                 length);
 453                 break;
 454         }
 455 }
 456
 457 /* print a counted string */
 458 static const char *
 459 print_cstring(register const char *cp, register const u_char *ep)
 460 {
 461         register u_int length;
 462
 463         if (cp >= (const char *)ep) {
 464                 fputs(tstr, stdout);
 465                 return (0);
 466         }
 467         length = *cp++;
 468
 469         /* Spec says string can be at most 32 bytes long */
 470         if (length > 32) {
 471                 (void)printf("[len=%u]", length);
 472                 return (0);
 473         }
 474         while ((int)--length >= 0) {
 475                 if (cp >= (const char *)ep) {
 476                         fputs(tstr, stdout);
 477                         return (0);
 478                 }
 479                 putchar(*cp++);
 480         }
 481         return (cp);
 482 }
 483
 484 static const struct atNBPtuple *
 485 nbp_tuple_print(register const struct atNBPtuple *tp,
 486                 register const u_char *ep,
 487                 register u_short snet, register u_char snode,
 488                 register u_char skt)
 489 {
 490         register const struct atNBPtuple *tpn;
 491
 492         if ((const u_char *)(tp + 1) > ep) {
 493                 fputs(tstr, stdout);
 494                 return 0;
 495         }
 496         tpn = nbp_name_print(tp, ep);
 497
 498         /* if the enumerator isn't 1, print it */
 499         if (tp->enumerator != 1)
 500                 (void)printf("(%d)", tp->enumerator);
 501
 502         /* if the socket doesn't match the src socket, print it */
 503         if (tp->skt != skt)
 504                 (void)printf(" %d", tp->skt);
 505
 506         /* if the address doesn't match the src address, it's an anomaly */
 507         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 508                 (void)printf(" [addr=%s]",
 509                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 510
 511         return (tpn);
 512 }
 513
 514 static const struct atNBPtuple *
 515 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 516 {
 517         register const char *cp = (const char *)tp + nbpTupleSize;
 518
 519         putchar(' ');
 520
 521         /* Object */
 522         putchar('"');
 523         if ((cp = print_cstring(cp, ep)) != NULL) {
 524                 /* Type */
 525                 putchar(':');
 526                 if ((cp = print_cstring(cp, ep)) != NULL) {
 527                         /* Zone */
 528                         putchar('@');
 529                         if ((cp = print_cstring(cp, ep)) != NULL)
 530                                 putchar('"');
 531                 }
 532         }
 533         return ((const struct atNBPtuple *)cp);
 534 }
 535
 536
 537 #define HASHNAMESIZE 4096
 538
 539 struct hnamemem {
 540         int addr;
 541         char *name;
 542         struct hnamemem *nxt;
 543 };
 544
 545 static struct hnamemem hnametable[HASHNAMESIZE];
 546
 547 static const char *
 548 ataddr_string(u_short atnet, u_char athost)
 549 {
 550         register struct hnamemem *tp, *tp2;
 551         register int i = (atnet << 8) | athost;
 552         char nambuf[MAXHOSTNAMELEN + 20];
 553         static int first = 1;
 554         FILE *fp;
 555
 556         /*
 557          * if this is the first call, see if there's an AppleTalk
 558          * number to name map file.
 559          */
 560         if (first && (first = 0, !nflag)
 561             && (fp = fopen("/etc/atalk.names", "r"))) {
 562                 char line[256];
 563                 int i1, i2, i3;
 564
 565                 while (fgets(line, sizeof(line), fp)) {
 566                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 567                                 continue;
 568                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 569                                      nambuf) == 4)
 570                                 /* got a hostname. */
 571                                 i3 |= ((i1 << 8) | i2) << 8;
 572                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 573                                         nambuf) == 3)
 574                                 /* got a net name */
 575                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 576                         else
 577                                 continue;
 578
 579                         for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
 580                              tp->nxt; tp = tp->nxt)
 581                                 ;
 582                         tp->addr = i2;
 583                         tp->nxt = newhnamemem();
 584                         tp->name = strdup(nambuf);
 585                 }
 586                 fclose(fp);
 587         }
 588
 589         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 590                 if (tp->addr == i)
 591                         return (tp->name);
 592
 593         /* didn't have the node name -- see if we've got the net name */
 594         i |= 255;
 595         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 596                 if (tp2->addr == i) {
 597                         tp->addr = (atnet << 8) | athost;
 598                         tp->nxt = newhnamemem();
 599                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 600                             tp2->name, athost);
 601                         tp->name = strdup(nambuf);
 602                         return (tp->name);
 603                 }
 604
 605         tp->addr = (atnet << 8) | athost;
 606         tp->nxt = newhnamemem();
 607         if (athost != 255)
 608                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 609                     atnet >> 8, atnet & 0xff, athost);
 610         else
 611                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 612                     atnet & 0xff);
 613         tp->name = strdup(nambuf);
 614
 615         return (tp->name);
 616 }
 617
 618 static struct tok skt2str[] = {
 619         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 620         { nbpSkt,       "nis" },        /* name info socket */
 621         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 622         { zipSkt,       "zip" },        /* zone info protocol */
 623         { 0,            NULL }
 624 };
 625
 626 static const char *
 627 ddpskt_string(register int skt)
 628 {
 629         static char buf[8];
 630
 631         if (nflag) {
 632                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 633                 return (buf);
 634         }
 635         return (tok2str(skt2str, "%d", skt));
 636 }