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 1.68 2001-07-18 09:19:47 guy Exp $ (LBL)";
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <sys/param.h>
  34 #include <sys/time.h>
  35 #include <sys/socket.h>
  36
  37 #include <netinet/in.h>
  38
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <string.h>
  42 #include <netdb.h>              /* for MAXHOSTNAMELEN on some platforms */
  43 #include <pcap.h>
  44
  45 #include "interface.h"
  46 #include "addrtoname.h"
  47 #include "ethertype.h"
  48 #include "extract.h"                    /* must come after interface.h */
  49 #include "appletalk.h"
  50
  51 static struct tok type2str[] = {
  52         { ddpRTMP,              "rtmp" },
  53         { ddpRTMPrequest,       "rtmpReq" },
  54         { ddpECHO,              "echo" },
  55         { ddpIP,                "IP" },
  56         { ddpARP,               "ARP" },
  57         { ddpKLAP,              "KLAP" },
  58         { 0,                    NULL }
  59 };
  60
  61 struct aarp {
  62         u_int16_t       htype, ptype;
  63         u_int8_t        halen, palen;
  64         u_int16_t       op;
  65         u_int8_t        hsaddr[6];
  66         u_int8_t        psaddr[4];
  67         u_int8_t        hdaddr[6];
  68         u_int8_t        pdaddr[4];
  69 };
  70
  71 static char tstr[] = "[|atalk]";
  72
  73 static void atp_print(const struct atATP *, u_int);
  74 static void atp_bitmap_print(u_char);
  75 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  76 static const char *print_cstring(const char *, const u_char *);
  77 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  78                                                 const u_char *,
  79                                                 u_short, u_char, u_char);
  80 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  81                                                const u_char *);
  82 static const char *ataddr_string(u_short, u_char);
  83 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  84 static const char *ddpskt_string(int);
  85
  86 /*
  87  * Print LLAP packets received on a physical LocalTalk interface.
  88  */
  89 void
  90 ltalk_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  91 {
  92         snapend = p + h->caplen;
  93         ++infodelay;
  94         ts_print(&h->ts);
  95         llap_print(p, h->caplen);
  96         if(xflag)
  97                 default_print(p, h->caplen);
  98         putchar('\n');
  99         --infodelay;
 100         if (infoprint)
 101                 info(0);
 102 }
 103
 104 /*
 105  * Print AppleTalk LLAP packets.
 106  */
 107 void
 108 llap_print(register const u_char *bp, u_int length)
 109 {
 110         register const struct LAP *lp;
 111         register const struct atDDP *dp;
 112         register const struct atShortDDP *sdp;
 113         u_short snet;
 114
 115         lp = (struct LAP *)bp;
 116         bp += sizeof(*lp);
 117         length -= sizeof(*lp);
 118         switch (lp->type) {
 119
 120         case lapShortDDP:
 121                 if (length < ddpSSize) {
 122                         (void)printf(" [|sddp %d]", length);
 123                         return;
 124                 }
 125                 sdp = (const struct atShortDDP *)bp;
 126                 printf("%s.%s",
 127                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 128                 printf(" > %s.%s:",
 129                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 130                 bp += ddpSSize;
 131                 length -= ddpSSize;
 132                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 133                 break;
 134
 135         case lapDDP:
 136                 if (length < ddpSize) {
 137                         (void)printf(" [|ddp %d]", length);
 138                         return;
 139                 }
 140                 dp = (const struct atDDP *)bp;
 141                 snet = EXTRACT_16BITS(&dp->srcNet);
 142                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 143                     ddpskt_string(dp->srcSkt));
 144                 printf(" > %s.%s:",
 145                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 146                     ddpskt_string(dp->dstSkt));
 147                 bp += ddpSize;
 148                 length -= ddpSize;
 149                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 150                 break;
 151
 152 #ifdef notdef
 153         case lapKLAP:
 154                 klap_print(bp, length);
 155                 break;
 156 #endif
 157
 158         default:
 159                 printf("%d > %d at-lap#%d %d",
 160                     lp->src, lp->dst, lp->type, length);
 161                 break;
 162         }
 163 }
 164
 165 /*
 166  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 167  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 168  * packets in them).
 169  */
 170 void
 171 atalk_print(register const u_char *bp, u_int length)
 172 {
 173         register const struct atDDP *dp;
 174         u_short snet;
 175
 176         if (length < ddpSize) {
 177           (void)printf(" [|ddp %d]", length);
 178           return;
 179         }
 180         dp = (const struct atDDP *)bp;
 181         snet = EXTRACT_16BITS(&dp->srcNet);
 182         printf("%s.%s", ataddr_string(snet, dp->srcNode),
 183                ddpskt_string(dp->srcSkt));
 184         printf(" > %s.%s:",
 185                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 186                ddpskt_string(dp->dstSkt));
 187         bp += ddpSize;
 188         length -= ddpSize;
 189 #ifdef LBL_ALIGN
 190         if ((long)bp & 3) {
 191                 static u_char *abuf = NULL;
 192
 193                 if (abuf == NULL) {
 194                         abuf = (u_char *)malloc(snaplen);
 195                         if (abuf == NULL)
 196                                 error("atalk_print: malloc");
 197                 }
 198                 memcpy((char *)abuf, (char *)bp, min(length, snaplen));
 199                 snapend += abuf - (u_char *)bp;
 200                 packetp = abuf;
 201                 bp = abuf;
 202         }
 203 #endif
 204         ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 205 }
 206
 207 /* XXX should probably pass in the snap header and do checks like arp_print() */
 208 void
 209 aarp_print(register const u_char *bp, u_int length)
 210 {
 211         register const struct aarp *ap;
 212
 213 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 214
 215         printf("aarp ");
 216         ap = (const struct aarp *)bp;
 217         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 218             ap->halen == 6 && ap->palen == 4 )
 219                 switch (ntohs(ap->op)) {
 220
 221                 case 1:                         /* request */
 222                         (void)printf("who-has %s tell %s",
 223                             AT(pdaddr), AT(psaddr));
 224                         return;
 225
 226                 case 2:                         /* response */
 227                         (void)printf("reply %s is-at %s",
 228                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 229                         return;
 230
 231                 case 3:                         /* probe (oy!) */
 232                         (void)printf("probe %s tell %s",
 233                             AT(pdaddr), AT(psaddr));
 234                         return;
 235                 }
 236         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 237             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 238             ap->halen, ap->palen);
 239 }
 240
 241 /*
 242  * Print AppleTalk Datagram Delivery Protocol packets.
 243  */
 244 static void
 245 ddp_print(register const u_char *bp, register u_int length, register int t,
 246           register u_short snet, register u_char snode, u_char skt)
 247 {
 248
 249         switch (t) {
 250
 251         case ddpNBP:
 252                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 253                 break;
 254
 255         case ddpATP:
 256                 atp_print((const struct atATP *)bp, length);
 257                 break;
 258
 259         default:
 260                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 261                 break;
 262         }
 263 }
 264
 265 static void
 266 atp_print(register const struct atATP *ap, u_int length)
 267 {
 268         char c;
 269         u_int32_t data;
 270
 271         if ((const u_char *)(ap + 1) > snapend) {
 272                 /* Just bail if we don't have the whole chunk. */
 273                 fputs(tstr, stdout);
 274                 return;
 275         }
 276         length -= sizeof(*ap);
 277         switch (ap->control & 0xc0) {
 278
 279         case atpReqCode:
 280                 (void)printf(" atp-req%s %d",
 281                              ap->control & atpXO? " " : "*",
 282                              EXTRACT_16BITS(&ap->transID));
 283
 284                 atp_bitmap_print(ap->bitmap);
 285
 286                 if (length != 0)
 287                         (void)printf(" [len=%d]", length);
 288
 289                 switch (ap->control & (atpEOM|atpSTS)) {
 290                 case atpEOM:
 291                         (void)printf(" [EOM]");
 292                         break;
 293                 case atpSTS:
 294                         (void)printf(" [STS]");
 295                         break;
 296                 case atpEOM|atpSTS:
 297                         (void)printf(" [EOM,STS]");
 298                         break;
 299                 }
 300                 break;
 301
 302         case atpRspCode:
 303                 (void)printf(" atp-resp%s%d:%d (%d)",
 304                              ap->control & atpEOM? "*" : " ",
 305                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 306                 switch (ap->control & (atpXO|atpSTS)) {
 307                 case atpXO:
 308                         (void)printf(" [XO]");
 309                         break;
 310                 case atpSTS:
 311                         (void)printf(" [STS]");
 312                         break;
 313                 case atpXO|atpSTS:
 314                         (void)printf(" [XO,STS]");
 315                         break;
 316                 }
 317                 break;
 318
 319         case atpRelCode:
 320                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 321
 322                 atp_bitmap_print(ap->bitmap);
 323
 324                 /* length should be zero */
 325                 if (length)
 326                         (void)printf(" [len=%d]", length);
 327
 328                 /* there shouldn't be any control flags */
 329                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 330                         c = '[';
 331                         if (ap->control & atpXO) {
 332                                 (void)printf("%cXO", c);
 333                                 c = ',';
 334                         }
 335                         if (ap->control & atpEOM) {
 336                                 (void)printf("%cEOM", c);
 337                                 c = ',';
 338                         }
 339                         if (ap->control & atpSTS) {
 340                                 (void)printf("%cSTS", c);
 341                                 c = ',';
 342                         }
 343                         (void)printf("]");
 344                 }
 345                 break;
 346
 347         default:
 348                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 349                              EXTRACT_16BITS(&ap->transID), length);
 350                 break;
 351         }
 352         data = EXTRACT_32BITS(&ap->userData);
 353         if (data != 0)
 354                 (void)printf(" 0x%x", data);
 355 }
 356
 357 static void
 358 atp_bitmap_print(register u_char bm)
 359 {
 360         register char c;
 361         register int i;
 362
 363         /*
 364          * The '& 0xff' below is needed for compilers that want to sign
 365          * extend a u_char, which is the case with the Ultrix compiler.
 366          * (gcc is smart enough to eliminate it, at least on the Sparc).
 367          */
 368         if ((bm + 1) & (bm & 0xff)) {
 369                 c = '<';
 370                 for (i = 0; bm; ++i) {
 371                         if (bm & 1) {
 372                                 (void)printf("%c%d", c, i);
 373                                 c = ',';
 374                         }
 375                         bm >>= 1;
 376                 }
 377                 (void)printf(">");
 378         } else {
 379                 for (i = 0; bm; ++i)
 380                         bm >>= 1;
 381                 if (i > 1)
 382                         (void)printf("<0-%d>", i - 1);
 383                 else
 384                         (void)printf("<0>");
 385         }
 386 }
 387
 388 static void
 389 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 390           register u_char snode, register u_char skt)
 391 {
 392         register const struct atNBPtuple *tp =
 393                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 394         int i;
 395         const u_char *ep;
 396
 397         length -= nbpHeaderSize;
 398         if (length < 8) {
 399                 /* must be room for at least one tuple */
 400                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 401                 return;
 402         }
 403         /* ep points to end of available data */
 404         ep = snapend;
 405         if ((const u_char *)tp > ep) {
 406                 fputs(tstr, stdout);
 407                 return;
 408         }
 409         switch (i = np->control & 0xf0) {
 410
 411         case nbpBrRq:
 412         case nbpLkUp:
 413                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 414                              np->id);
 415                 if ((const u_char *)(tp + 1) > ep) {
 416                         fputs(tstr, stdout);
 417                         return;
 418                 }
 419                 (void)nbp_name_print(tp, ep);
 420                 /*
 421                  * look for anomalies: the spec says there can only
 422                  * be one tuple, the address must match the source
 423                  * address and the enumerator should be zero.
 424                  */
 425                 if ((np->control & 0xf) != 1)
 426                         (void)printf(" [ntup=%d]", np->control & 0xf);
 427                 if (tp->enumerator)
 428                         (void)printf(" [enum=%d]", tp->enumerator);
 429                 if (EXTRACT_16BITS(&tp->net) != snet ||
 430                     tp->node != snode || tp->skt != skt)
 431                         (void)printf(" [addr=%s.%d]",
 432                             ataddr_string(EXTRACT_16BITS(&tp->net),
 433                             tp->node), tp->skt);
 434                 break;
 435
 436         case nbpLkUpReply:
 437                 (void)printf(" nbp-reply %d:", np->id);
 438
 439                 /* print each of the tuples in the reply */
 440                 for (i = np->control & 0xf; --i >= 0 && tp; )
 441                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 442                 break;
 443
 444         default:
 445                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 446                                 length);
 447                 break;
 448         }
 449 }
 450
 451 /* print a counted string */
 452 static const char *
 453 print_cstring(register const char *cp, register const u_char *ep)
 454 {
 455         register u_int length;
 456
 457         if (cp >= (const char *)ep) {
 458                 fputs(tstr, stdout);
 459                 return (0);
 460         }
 461         length = *cp++;
 462
 463         /* Spec says string can be at most 32 bytes long */
 464         if (length > 32) {
 465                 (void)printf("[len=%u]", length);
 466                 return (0);
 467         }
 468         while ((int)--length >= 0) {
 469                 if (cp >= (char *)ep) {
 470                         fputs(tstr, stdout);
 471                         return (0);
 472                 }
 473                 putchar(*cp++);
 474         }
 475         return (cp);
 476 }
 477
 478 static const struct atNBPtuple *
 479 nbp_tuple_print(register const struct atNBPtuple *tp,
 480                 register const u_char *ep,
 481                 register u_short snet, register u_char snode,
 482                 register u_char skt)
 483 {
 484         register const struct atNBPtuple *tpn;
 485
 486         if ((const u_char *)(tp + 1) > ep) {
 487                 fputs(tstr, stdout);
 488                 return 0;
 489         }
 490         tpn = nbp_name_print(tp, ep);
 491
 492         /* if the enumerator isn't 1, print it */
 493         if (tp->enumerator != 1)
 494                 (void)printf("(%d)", tp->enumerator);
 495
 496         /* if the socket doesn't match the src socket, print it */
 497         if (tp->skt != skt)
 498                 (void)printf(" %d", tp->skt);
 499
 500         /* if the address doesn't match the src address, it's an anomaly */
 501         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 502                 (void)printf(" [addr=%s]",
 503                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 504
 505         return (tpn);
 506 }
 507
 508 static const struct atNBPtuple *
 509 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 510 {
 511         register const char *cp = (const char *)tp + nbpTupleSize;
 512
 513         putchar(' ');
 514
 515         /* Object */
 516         putchar('"');
 517         if ((cp = print_cstring(cp, ep)) != NULL) {
 518                 /* Type */
 519                 putchar(':');
 520                 if ((cp = print_cstring(cp, ep)) != NULL) {
 521                         /* Zone */
 522                         putchar('@');
 523                         if ((cp = print_cstring(cp, ep)) != NULL)
 524                                 putchar('"');
 525                 }
 526         }
 527         return ((const struct atNBPtuple *)cp);
 528 }
 529
 530
 531 #define HASHNAMESIZE 4096
 532
 533 struct hnamemem {
 534         int addr;
 535         char *name;
 536         struct hnamemem *nxt;
 537 };
 538
 539 static struct hnamemem hnametable[HASHNAMESIZE];
 540
 541 static const char *
 542 ataddr_string(u_short atnet, u_char athost)
 543 {
 544         register struct hnamemem *tp, *tp2;
 545         register int i = (atnet << 8) | athost;
 546         char nambuf[MAXHOSTNAMELEN + 20];
 547         static int first = 1;
 548         FILE *fp;
 549
 550         /*
 551          * if this is the first call, see if there's an AppleTalk
 552          * number to name map file.
 553          */
 554         if (first && (first = 0, !nflag)
 555             && (fp = fopen("/etc/atalk.names", "r"))) {
 556                 char line[256];
 557                 int i1, i2, i3;
 558
 559                 while (fgets(line, sizeof(line), fp)) {
 560                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 561                                 continue;
 562                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 563                                      nambuf) == 4)
 564                                 /* got a hostname. */
 565                                 i3 |= ((i1 << 8) | i2) << 8;
 566                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 567                                         nambuf) == 3)
 568                                 /* got a net name */
 569                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 570                         else
 571                                 continue;
 572
 573                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 574                              tp->nxt; tp = tp->nxt)
 575                                 ;
 576                         tp->addr = i3;
 577                         tp->nxt = newhnamemem();
 578                         tp->name = strdup(nambuf);
 579                 }
 580                 fclose(fp);
 581         }
 582
 583         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 584                 if (tp->addr == i)
 585                         return (tp->name);
 586
 587         /* didn't have the node name -- see if we've got the net name */
 588         i |= 255;
 589         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 590                 if (tp2->addr == i) {
 591                         tp->addr = (atnet << 8) | athost;
 592                         tp->nxt = newhnamemem();
 593                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 594                             tp2->name, athost);
 595                         tp->name = strdup(nambuf);
 596                         return (tp->name);
 597                 }
 598
 599         tp->addr = (atnet << 8) | athost;
 600         tp->nxt = newhnamemem();
 601         if (athost != 255)
 602                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 603                     atnet >> 8, atnet & 0xff, athost);
 604         else
 605                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 606                     atnet & 0xff);
 607         tp->name = strdup(nambuf);
 608
 609         return (tp->name);
 610 }
 611
 612 static struct tok skt2str[] = {
 613         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 614         { nbpSkt,       "nis" },        /* name info socket */
 615         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 616         { zipSkt,       "zip" },        /* zone info protocol */
 617         { 0,            NULL }
 618 };
 619
 620 static const char *
 621 ddpskt_string(register int skt)
 622 {
 623         static char buf[8];
 624
 625         if (nflag) {
 626                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 627                 return (buf);
 628         }
 629         return (tok2str(skt2str, "%d", skt));
 630 }