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 1.62 2000-10-10 05:03:32 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
  44 #include "interface.h"
  45 #include "addrtoname.h"
  46 #include "ethertype.h"
  47 #include "extract.h"                    /* must come after interface.h */
  48 #include "appletalk.h"
  49 #include "savestr.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 AppleTalk Datagram Delivery Protocol packets.
  88  */
  89 void
  90 atalk_print(register const u_char *bp, u_int length)
  91 {
  92         register const struct LAP *lp;
  93         register const struct atDDP *dp;
  94         register const struct atShortDDP *sdp;
  95         u_short snet;
  96
  97         lp = (struct LAP *)bp;
  98         bp += sizeof(*lp);
  99         length -= sizeof(*lp);
 100         switch (lp->type) {
 101
 102         case lapShortDDP:
 103                 if (length < ddpSSize) {
 104                         (void)printf(" [|sddp %d]", length);
 105                         return;
 106                 }
 107                 sdp = (const struct atShortDDP *)bp;
 108                 printf("%s.%s",
 109                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 110                 printf(" > %s.%s:",
 111                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 112                 bp += ddpSSize;
 113                 length -= ddpSSize;
 114                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 115                 break;
 116
 117         case lapDDP:
 118                 if (length < ddpSize) {
 119                         (void)printf(" [|ddp %d]", length);
 120                         return;
 121                 }
 122                 dp = (const struct atDDP *)bp;
 123                 snet = EXTRACT_16BITS(&dp->srcNet);
 124                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 125                     ddpskt_string(dp->srcSkt));
 126                 printf(" > %s.%s:",
 127                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 128                     ddpskt_string(dp->dstSkt));
 129                 bp += ddpSize;
 130                 length -= ddpSize;
 131                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 132                 break;
 133
 134 #ifdef notdef
 135         case lapKLAP:
 136                 klap_print(bp, length);
 137                 break;
 138 #endif
 139
 140         default:
 141                 printf("%d > %d at-lap#%d %d",
 142                     lp->src, lp->dst, lp->type, length);
 143                 break;
 144         }
 145 }
 146
 147 /* XXX should probably pass in the snap header and do checks like arp_print() */
 148 void
 149 aarp_print(register const u_char *bp, u_int length)
 150 {
 151         register const struct aarp *ap;
 152
 153 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 154
 155         printf("aarp ");
 156         ap = (const struct aarp *)bp;
 157         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 158             ap->halen == 6 && ap->palen == 4 )
 159                 switch (ntohs(ap->op)) {
 160
 161                 case 1:                         /* request */
 162                         (void)printf("who-has %s tell %s",
 163                             AT(pdaddr), AT(psaddr));
 164                         return;
 165
 166                 case 2:                         /* response */
 167                         (void)printf("reply %s is-at %s",
 168                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 169                         return;
 170
 171                 case 3:                         /* probe (oy!) */
 172                         (void)printf("probe %s tell %s",
 173                             AT(pdaddr), AT(psaddr));
 174                         return;
 175                 }
 176         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 177             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 178             ap->halen, ap->palen);
 179 }
 180
 181 static void
 182 ddp_print(register const u_char *bp, register u_int length, register int t,
 183           register u_short snet, register u_char snode, u_char skt)
 184 {
 185
 186         switch (t) {
 187
 188         case ddpNBP:
 189                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 190                 break;
 191
 192         case ddpATP:
 193                 atp_print((const struct atATP *)bp, length);
 194                 break;
 195
 196         default:
 197                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 198                 break;
 199         }
 200 }
 201
 202 static void
 203 atp_print(register const struct atATP *ap, u_int length)
 204 {
 205         char c;
 206         u_int32_t data;
 207
 208         if ((const u_char *)(ap + 1) > snapend) {
 209                 /* Just bail if we don't have the whole chunk. */
 210                 fputs(tstr, stdout);
 211                 return;
 212         }
 213         length -= sizeof(*ap);
 214         switch (ap->control & 0xc0) {
 215
 216         case atpReqCode:
 217                 (void)printf(" atp-req%s %d",
 218                              ap->control & atpXO? " " : "*",
 219                              EXTRACT_16BITS(&ap->transID));
 220
 221                 atp_bitmap_print(ap->bitmap);
 222
 223                 if (length != 0)
 224                         (void)printf(" [len=%d]", length);
 225
 226                 switch (ap->control & (atpEOM|atpSTS)) {
 227                 case atpEOM:
 228                         (void)printf(" [EOM]");
 229                         break;
 230                 case atpSTS:
 231                         (void)printf(" [STS]");
 232                         break;
 233                 case atpEOM|atpSTS:
 234                         (void)printf(" [EOM,STS]");
 235                         break;
 236                 }
 237                 break;
 238
 239         case atpRspCode:
 240                 (void)printf(" atp-resp%s%d:%d (%d)",
 241                              ap->control & atpEOM? "*" : " ",
 242                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 243                 switch (ap->control & (atpXO|atpSTS)) {
 244                 case atpXO:
 245                         (void)printf(" [XO]");
 246                         break;
 247                 case atpSTS:
 248                         (void)printf(" [STS]");
 249                         break;
 250                 case atpXO|atpSTS:
 251                         (void)printf(" [XO,STS]");
 252                         break;
 253                 }
 254                 break;
 255
 256         case atpRelCode:
 257                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 258
 259                 atp_bitmap_print(ap->bitmap);
 260
 261                 /* length should be zero */
 262                 if (length)
 263                         (void)printf(" [len=%d]", length);
 264
 265                 /* there shouldn't be any control flags */
 266                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 267                         c = '[';
 268                         if (ap->control & atpXO) {
 269                                 (void)printf("%cXO", c);
 270                                 c = ',';
 271                         }
 272                         if (ap->control & atpEOM) {
 273                                 (void)printf("%cEOM", c);
 274                                 c = ',';
 275                         }
 276                         if (ap->control & atpSTS) {
 277                                 (void)printf("%cSTS", c);
 278                                 c = ',';
 279                         }
 280                         (void)printf("]");
 281                 }
 282                 break;
 283
 284         default:
 285                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 286                              EXTRACT_16BITS(&ap->transID), length);
 287                 break;
 288         }
 289         data = EXTRACT_32BITS(&ap->userData);
 290         if (data != 0)
 291                 (void)printf(" 0x%x", data);
 292 }
 293
 294 static void
 295 atp_bitmap_print(register u_char bm)
 296 {
 297         register char c;
 298         register int i;
 299
 300         /*
 301          * The '& 0xff' below is needed for compilers that want to sign
 302          * extend a u_char, which is the case with the Ultrix compiler.
 303          * (gcc is smart enough to eliminate it, at least on the Sparc).
 304          */
 305         if ((bm + 1) & (bm & 0xff)) {
 306                 c = '<';
 307                 for (i = 0; bm; ++i) {
 308                         if (bm & 1) {
 309                                 (void)printf("%c%d", c, i);
 310                                 c = ',';
 311                         }
 312                         bm >>= 1;
 313                 }
 314                 (void)printf(">");
 315         } else {
 316                 for (i = 0; bm; ++i)
 317                         bm >>= 1;
 318                 if (i > 1)
 319                         (void)printf("<0-%d>", i - 1);
 320                 else
 321                         (void)printf("<0>");
 322         }
 323 }
 324
 325 static void
 326 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 327           register u_char snode, register u_char skt)
 328 {
 329         register const struct atNBPtuple *tp =
 330                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 331         int i;
 332         const u_char *ep;
 333
 334         length -= nbpHeaderSize;
 335         if (length < 8) {
 336                 /* must be room for at least one tuple */
 337                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 338                 return;
 339         }
 340         /* ep points to end of available data */
 341         ep = snapend;
 342         if ((const u_char *)tp > ep) {
 343                 fputs(tstr, stdout);
 344                 return;
 345         }
 346         switch (i = np->control & 0xf0) {
 347
 348         case nbpBrRq:
 349         case nbpLkUp:
 350                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 351                              np->id);
 352                 if ((const u_char *)(tp + 1) > ep) {
 353                         fputs(tstr, stdout);
 354                         return;
 355                 }
 356                 (void)nbp_name_print(tp, ep);
 357                 /*
 358                  * look for anomalies: the spec says there can only
 359                  * be one tuple, the address must match the source
 360                  * address and the enumerator should be zero.
 361                  */
 362                 if ((np->control & 0xf) != 1)
 363                         (void)printf(" [ntup=%d]", np->control & 0xf);
 364                 if (tp->enumerator)
 365                         (void)printf(" [enum=%d]", tp->enumerator);
 366                 if (EXTRACT_16BITS(&tp->net) != snet ||
 367                     tp->node != snode || tp->skt != skt)
 368                         (void)printf(" [addr=%s.%d]",
 369                             ataddr_string(EXTRACT_16BITS(&tp->net),
 370                             tp->node), tp->skt);
 371                 break;
 372
 373         case nbpLkUpReply:
 374                 (void)printf(" nbp-reply %d:", np->id);
 375
 376                 /* print each of the tuples in the reply */
 377                 for (i = np->control & 0xf; --i >= 0 && tp; )
 378                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 379                 break;
 380
 381         default:
 382                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 383                                 length);
 384                 break;
 385         }
 386 }
 387
 388 /* print a counted string */
 389 static const char *
 390 print_cstring(register const char *cp, register const u_char *ep)
 391 {
 392         register u_int length;
 393
 394         if (cp >= (const char *)ep) {
 395                 fputs(tstr, stdout);
 396                 return (0);
 397         }
 398         length = *cp++;
 399
 400         /* Spec says string can be at most 32 bytes long */
 401         if (length > 32) {
 402                 (void)printf("[len=%u]", length);
 403                 return (0);
 404         }
 405         while ((int)--length >= 0) {
 406                 if (cp >= (char *)ep) {
 407                         fputs(tstr, stdout);
 408                         return (0);
 409                 }
 410                 putchar(*cp++);
 411         }
 412         return (cp);
 413 }
 414
 415 static const struct atNBPtuple *
 416 nbp_tuple_print(register const struct atNBPtuple *tp,
 417                 register const u_char *ep,
 418                 register u_short snet, register u_char snode,
 419                 register u_char skt)
 420 {
 421         register const struct atNBPtuple *tpn;
 422
 423         if ((const u_char *)(tp + 1) > ep) {
 424                 fputs(tstr, stdout);
 425                 return 0;
 426         }
 427         tpn = nbp_name_print(tp, ep);
 428
 429         /* if the enumerator isn't 1, print it */
 430         if (tp->enumerator != 1)
 431                 (void)printf("(%d)", tp->enumerator);
 432
 433         /* if the socket doesn't match the src socket, print it */
 434         if (tp->skt != skt)
 435                 (void)printf(" %d", tp->skt);
 436
 437         /* if the address doesn't match the src address, it's an anomaly */
 438         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 439                 (void)printf(" [addr=%s]",
 440                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 441
 442         return (tpn);
 443 }
 444
 445 static const struct atNBPtuple *
 446 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 447 {
 448         register const char *cp = (const char *)tp + nbpTupleSize;
 449
 450         putchar(' ');
 451
 452         /* Object */
 453         putchar('"');
 454         if ((cp = print_cstring(cp, ep)) != NULL) {
 455                 /* Type */
 456                 putchar(':');
 457                 if ((cp = print_cstring(cp, ep)) != NULL) {
 458                         /* Zone */
 459                         putchar('@');
 460                         if ((cp = print_cstring(cp, ep)) != NULL)
 461                                 putchar('"');
 462                 }
 463         }
 464         return ((const struct atNBPtuple *)cp);
 465 }
 466
 467
 468 #define HASHNAMESIZE 4096
 469
 470 struct hnamemem {
 471         int addr;
 472         char *name;
 473         struct hnamemem *nxt;
 474 };
 475
 476 static struct hnamemem hnametable[HASHNAMESIZE];
 477
 478 static const char *
 479 ataddr_string(u_short atnet, u_char athost)
 480 {
 481         register struct hnamemem *tp, *tp2;
 482         register int i = (atnet << 8) | athost;
 483         char nambuf[MAXHOSTNAMELEN + 20];
 484         static int first = 1;
 485         FILE *fp;
 486
 487         /*
 488          * if this is the first call, see if there's an AppleTalk
 489          * number to name map file.
 490          */
 491         if (first && (first = 0, !nflag)
 492             && (fp = fopen("/etc/atalk.names", "r"))) {
 493                 char line[256];
 494                 int i1, i2, i3;
 495
 496                 while (fgets(line, sizeof(line), fp)) {
 497                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 498                                 continue;
 499                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 500                                      nambuf) == 4)
 501                                 /* got a hostname. */
 502                                 i3 |= ((i1 << 8) | i2) << 8;
 503                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 504                                         nambuf) == 3)
 505                                 /* got a net name */
 506                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 507                         else
 508                                 continue;
 509
 510                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 511                              tp->nxt; tp = tp->nxt)
 512                                 ;
 513                         tp->addr = i3;
 514                         tp->nxt = newhnamemem();
 515                         tp->name = savestr(nambuf);
 516                 }
 517                 fclose(fp);
 518         }
 519
 520         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 521                 if (tp->addr == i)
 522                         return (tp->name);
 523
 524         /* didn't have the node name -- see if we've got the net name */
 525         i |= 255;
 526         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 527                 if (tp2->addr == i) {
 528                         tp->addr = (atnet << 8) | athost;
 529                         tp->nxt = newhnamemem();
 530                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 531                             tp2->name, athost);
 532                         tp->name = savestr(nambuf);
 533                         return (tp->name);
 534                 }
 535
 536         tp->addr = (atnet << 8) | athost;
 537         tp->nxt = newhnamemem();
 538         if (athost != 255)
 539                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 540                     atnet >> 8, atnet & 0xff, athost);
 541         else
 542                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 543                     atnet & 0xff);
 544         tp->name = savestr(nambuf);
 545
 546         return (tp->name);
 547 }
 548
 549 static struct tok skt2str[] = {
 550         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 551         { nbpSkt,       "nis" },        /* name info socket */
 552         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 553         { zipSkt,       "zip" },        /* zone info protocol */
 554         { 0,            NULL }
 555 };
 556
 557 static const char *
 558 ddpskt_string(register int skt)
 559 {
 560         static char buf[8];
 561
 562         if (nflag) {
 563                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 564                 return (buf);
 565         }
 566         return (tok2str(skt2str, "%d", skt));
 567 }