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