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 1.50 1999-10-30 05:11:10 itojun Exp $ (LBL)";
  27 #endif
  28
  29 #include <sys/param.h>
  30 #include <sys/time.h>
  31 #include <sys/socket.h>
  32
  33 #if __STDC__
  34 struct mbuf;
  35 struct rtentry;
  36 #endif
  37 #include <net/if.h>
  38
  39 #include <netinet/in.h>
  40 #include <netinet/in_systm.h>
  41 #include <netinet/ip.h>
  42 #include <netinet/ip_var.h>
  43 #include <netinet/if_ether.h>
  44 #include <netinet/udp.h>
  45 #include <netinet/udp_var.h>
  46 #include <netinet/tcp.h>
  47
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51
  52 #include "interface.h"
  53 #include "addrtoname.h"
  54 #include "ethertype.h"
  55 #include "extract.h"                    /* must come after interface.h */
  56 #include "appletalk.h"
  57 #include "savestr.h"
  58
  59 static struct tok type2str[] = {
  60         { ddpRTMP,              "rtmp" },
  61         { ddpRTMPrequest,       "rtmpReq" },
  62         { ddpECHO,              "echo" },
  63         { ddpIP,                "IP" },
  64         { ddpARP,               "ARP" },
  65         { ddpKLAP,              "KLAP" },
  66         { 0,                    NULL }
  67 };
  68
  69 struct aarp {
  70         u_short htype, ptype;
  71         u_char  halen, palen;
  72         u_short op;
  73         u_char  hsaddr[6];
  74         u_char  psaddr[4];
  75         u_char  hdaddr[6];
  76         u_char  pdaddr[4];
  77 };
  78
  79 static char tstr[] = "[|atalk]";
  80
  81 static void atp_print(const struct atATP *, u_int);
  82 static void atp_bitmap_print(u_char);
  83 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  84 static const char *print_cstring(const char *, const u_char *);
  85 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  86                                                 const u_char *,
  87                                                 u_short, u_char, u_char);
  88 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  89                                                const u_char *);
  90 static const char *ataddr_string(u_short, u_char);
  91 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  92 static const char *ddpskt_string(int);
  93
  94 /*
  95  * Print AppleTalk Datagram Delivery Protocol packets.
  96  */
  97 void
  98 atalk_print(register const u_char *bp, u_int length)
  99 {
 100         register const struct LAP *lp;
 101         register const struct atDDP *dp;
 102         register const struct atShortDDP *sdp;
 103         u_short snet;
 104
 105         lp = (struct LAP *)bp;
 106         bp += sizeof(*lp);
 107         length -= sizeof(*lp);
 108         switch (lp->type) {
 109
 110         case lapShortDDP:
 111                 if (length < ddpSSize) {
 112                         (void)printf(" [|sddp %d]", length);
 113                         return;
 114                 }
 115                 sdp = (const struct atShortDDP *)bp;
 116                 printf("%s.%s",
 117                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 118                 printf(" > %s.%s:",
 119                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 120                 bp += ddpSSize;
 121                 length -= ddpSSize;
 122                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 123                 break;
 124
 125         case lapDDP:
 126                 if (length < ddpSize) {
 127                         (void)printf(" [|ddp %d]", length);
 128                         return;
 129                 }
 130                 dp = (const struct atDDP *)bp;
 131                 snet = EXTRACT_16BITS(&dp->srcNet);
 132                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 133                     ddpskt_string(dp->srcSkt));
 134                 printf(" > %s.%s:",
 135                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 136                     ddpskt_string(dp->dstSkt));
 137                 bp += ddpSize;
 138                 length -= 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 }
 154
 155 /* XXX should probably pass in the snap header and do checks like arp_print() */
 156 void
 157 aarp_print(register const u_char *bp, u_int length)
 158 {
 159         register const struct aarp *ap;
 160
 161 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 162
 163         printf("aarp ");
 164         ap = (const struct aarp *)bp;
 165         if (ap->htype == 1 && ap->ptype == ETHERTYPE_ATALK &&
 166             ap->halen == 6 && ap->palen == 4 )
 167                 switch (ap->op) {
 168
 169                 case 1:                         /* request */
 170                         (void)printf("who-has %s tell %s",
 171                             AT(pdaddr), AT(psaddr));
 172                         return;
 173
 174                 case 2:                         /* response */
 175                         (void)printf("reply %s is-at %s",
 176                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 177                         return;
 178
 179                 case 3:                         /* probe (oy!) */
 180                         (void)printf("probe %s tell %s",
 181                             AT(pdaddr), AT(psaddr));
 182                         return;
 183                 }
 184         (void)printf("len %d op %d htype %d ptype %#x halen %d palen %d",
 185             length, ap->op, ap->htype, ap->ptype, ap->halen, ap->palen );
 186 }
 187
 188 static void
 189 ddp_print(register const u_char *bp, register u_int length, register int t,
 190           register u_short snet, register u_char snode, u_char skt)
 191 {
 192
 193         switch (t) {
 194
 195         case ddpNBP:
 196                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 197                 break;
 198
 199         case ddpATP:
 200                 atp_print((const struct atATP *)bp, length);
 201                 break;
 202
 203         default:
 204                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 205                 break;
 206         }
 207 }
 208
 209 static void
 210 atp_print(register const struct atATP *ap, u_int length)
 211 {
 212         char c;
 213         u_int32_t data;
 214
 215         if ((const u_char *)(ap + 1) > snapend) {
 216                 /* Just bail if we don't have the whole chunk. */
 217                 fputs(tstr, stdout);
 218                 return;
 219         }
 220         length -= sizeof(*ap);
 221         switch (ap->control & 0xc0) {
 222
 223         case atpReqCode:
 224                 (void)printf(" atp-req%s %d",
 225                              ap->control & atpXO? " " : "*",
 226                              EXTRACT_16BITS(&ap->transID));
 227
 228                 atp_bitmap_print(ap->bitmap);
 229
 230                 if (length != 0)
 231                         (void)printf(" [len=%d]", length);
 232
 233                 switch (ap->control & (atpEOM|atpSTS)) {
 234                 case atpEOM:
 235                         (void)printf(" [EOM]");
 236                         break;
 237                 case atpSTS:
 238                         (void)printf(" [STS]");
 239                         break;
 240                 case atpEOM|atpSTS:
 241                         (void)printf(" [EOM,STS]");
 242                         break;
 243                 }
 244                 break;
 245
 246         case atpRspCode:
 247                 (void)printf(" atp-resp%s%d:%d (%d)",
 248                              ap->control & atpEOM? "*" : " ",
 249                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 250                 switch (ap->control & (atpXO|atpSTS)) {
 251                 case atpXO:
 252                         (void)printf(" [XO]");
 253                         break;
 254                 case atpSTS:
 255                         (void)printf(" [STS]");
 256                         break;
 257                 case atpXO|atpSTS:
 258                         (void)printf(" [XO,STS]");
 259                         break;
 260                 }
 261                 break;
 262
 263         case atpRelCode:
 264                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 265
 266                 atp_bitmap_print(ap->bitmap);
 267
 268                 /* length should be zero */
 269                 if (length)
 270                         (void)printf(" [len=%d]", length);
 271
 272                 /* there shouldn't be any control flags */
 273                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 274                         c = '[';
 275                         if (ap->control & atpXO) {
 276                                 (void)printf("%cXO", c);
 277                                 c = ',';
 278                         }
 279                         if (ap->control & atpEOM) {
 280                                 (void)printf("%cEOM", c);
 281                                 c = ',';
 282                         }
 283                         if (ap->control & atpSTS) {
 284                                 (void)printf("%cSTS", c);
 285                                 c = ',';
 286                         }
 287                         (void)printf("]");
 288                 }
 289                 break;
 290
 291         default:
 292                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 293                              EXTRACT_16BITS(&ap->transID), length);
 294                 break;
 295         }
 296         data = EXTRACT_32BITS(&ap->userData);
 297         if (data != 0)
 298                 (void)printf(" 0x%x", data);
 299 }
 300
 301 static void
 302 atp_bitmap_print(register u_char bm)
 303 {
 304         register char c;
 305         register int i;
 306
 307         /*
 308          * The '& 0xff' below is needed for compilers that want to sign
 309          * extend a u_char, which is the case with the Ultrix compiler.
 310          * (gcc is smart enough to eliminate it, at least on the Sparc).
 311          */
 312         if ((bm + 1) & (bm & 0xff)) {
 313                 c = '<';
 314                 for (i = 0; bm; ++i) {
 315                         if (bm & 1) {
 316                                 (void)printf("%c%d", c, i);
 317                                 c = ',';
 318                         }
 319                         bm >>= 1;
 320                 }
 321                 (void)printf(">");
 322         } else {
 323                 for (i = 0; bm; ++i)
 324                         bm >>= 1;
 325                 if (i > 1)
 326                         (void)printf("<0-%d>", i - 1);
 327                 else
 328                         (void)printf("<0>");
 329         }
 330 }
 331
 332 static void
 333 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 334           register u_char snode, register u_char skt)
 335 {
 336         register const struct atNBPtuple *tp =
 337                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 338         int i;
 339         const u_char *ep;
 340
 341         length -= nbpHeaderSize;
 342         if (length < 8) {
 343                 /* must be room for at least one tuple */
 344                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 345                 return;
 346         }
 347         /* ep points to end of available data */
 348         ep = snapend;
 349         if ((const u_char *)tp > ep) {
 350                 fputs(tstr, stdout);
 351                 return;
 352         }
 353         switch (i = np->control & 0xf0) {
 354
 355         case nbpBrRq:
 356         case nbpLkUp:
 357                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 358                              np->id);
 359                 if ((const u_char *)(tp + 1) > ep) {
 360                         fputs(tstr, stdout);
 361                         return;
 362                 }
 363                 (void)nbp_name_print(tp, ep);
 364                 /*
 365                  * look for anomalies: the spec says there can only
 366                  * be one tuple, the address must match the source
 367                  * address and the enumerator should be zero.
 368                  */
 369                 if ((np->control & 0xf) != 1)
 370                         (void)printf(" [ntup=%d]", np->control & 0xf);
 371                 if (tp->enumerator)
 372                         (void)printf(" [enum=%d]", tp->enumerator);
 373                 if (EXTRACT_16BITS(&tp->net) != snet ||
 374                     tp->node != snode || tp->skt != skt)
 375                         (void)printf(" [addr=%s.%d]",
 376                             ataddr_string(EXTRACT_16BITS(&tp->net),
 377                             tp->node), tp->skt);
 378                 break;
 379
 380         case nbpLkUpReply:
 381                 (void)printf(" nbp-reply %d:", np->id);
 382
 383                 /* print each of the tuples in the reply */
 384                 for (i = np->control & 0xf; --i >= 0 && tp; )
 385                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 386                 break;
 387
 388         default:
 389                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 390                                 length);
 391                 break;
 392         }
 393 }
 394
 395 /* print a counted string */
 396 static const char *
 397 print_cstring(register const char *cp, register const u_char *ep)
 398 {
 399         register u_int length;
 400
 401         if (cp >= (const char *)ep) {
 402                 fputs(tstr, stdout);
 403                 return (0);
 404         }
 405         length = *cp++;
 406
 407         /* Spec says string can be at most 32 bytes long */
 408         if (length > 32) {
 409                 (void)printf("[len=%u]", length);
 410                 return (0);
 411         }
 412         while ((int)--length >= 0) {
 413                 if (cp >= (char *)ep) {
 414                         fputs(tstr, stdout);
 415                         return (0);
 416                 }
 417                 putchar(*cp++);
 418         }
 419         return (cp);
 420 }
 421
 422 static const struct atNBPtuple *
 423 nbp_tuple_print(register const struct atNBPtuple *tp,
 424                 register const u_char *ep,
 425                 register u_short snet, register u_char snode,
 426                 register u_char skt)
 427 {
 428         register const struct atNBPtuple *tpn;
 429
 430         if ((const u_char *)(tp + 1) > ep) {
 431                 fputs(tstr, stdout);
 432                 return 0;
 433         }
 434         tpn = nbp_name_print(tp, ep);
 435
 436         /* if the enumerator isn't 1, print it */
 437         if (tp->enumerator != 1)
 438                 (void)printf("(%d)", tp->enumerator);
 439
 440         /* if the socket doesn't match the src socket, print it */
 441         if (tp->skt != skt)
 442                 (void)printf(" %d", tp->skt);
 443
 444         /* if the address doesn't match the src address, it's an anomaly */
 445         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 446                 (void)printf(" [addr=%s]",
 447                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 448
 449         return (tpn);
 450 }
 451
 452 static const struct atNBPtuple *
 453 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 454 {
 455         register const char *cp = (const char *)tp + nbpTupleSize;
 456
 457         putchar(' ');
 458
 459         /* Object */
 460         putchar('"');
 461         if ((cp = print_cstring(cp, ep)) != NULL) {
 462                 /* Type */
 463                 putchar(':');
 464                 if ((cp = print_cstring(cp, ep)) != NULL) {
 465                         /* Zone */
 466                         putchar('@');
 467                         if ((cp = print_cstring(cp, ep)) != NULL)
 468                                 putchar('"');
 469                 }
 470         }
 471         return ((const struct atNBPtuple *)cp);
 472 }
 473
 474
 475 #define HASHNAMESIZE 4096
 476
 477 struct hnamemem {
 478         int addr;
 479         char *name;
 480         struct hnamemem *nxt;
 481 };
 482
 483 static struct hnamemem hnametable[HASHNAMESIZE];
 484
 485 static const char *
 486 ataddr_string(u_short atnet, u_char athost)
 487 {
 488         register struct hnamemem *tp, *tp2;
 489         register int i = (atnet << 8) | athost;
 490         char nambuf[256];
 491         static int first = 1;
 492         FILE *fp;
 493
 494         /*
 495          * if this is the first call, see if there's an AppleTalk
 496          * number to name map file.
 497          */
 498         if (first && (first = 0, !nflag)
 499             && (fp = fopen("/etc/atalk.names", "r"))) {
 500                 char line[256];
 501                 int i1, i2, i3;
 502
 503                 while (fgets(line, sizeof(line), fp)) {
 504                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 505                                 continue;
 506                         if (sscanf(line, "%d.%d.%d %s", &i1, &i2, &i3,
 507                                      nambuf) == 4)
 508                                 /* got a hostname. */
 509                                 i3 |= ((i1 << 8) | i2) << 8;
 510                         else if (sscanf(line, "%d.%d %s", &i1, &i2,
 511                                         nambuf) == 3)
 512                                 /* got a net name */
 513                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 514                         else
 515                                 continue;
 516
 517                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 518                              tp->nxt; tp = tp->nxt)
 519                                 ;
 520                         tp->addr = i3;
 521                         tp->nxt = newhnamemem();
 522                         tp->name = savestr(nambuf);
 523                 }
 524                 fclose(fp);
 525         }
 526
 527         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 528                 if (tp->addr == i)
 529                         return (tp->name);
 530
 531         /* didn't have the node name -- see if we've got the net name */
 532         i |= 255;
 533         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 534                 if (tp2->addr == i) {
 535                         tp->addr = (atnet << 8) | athost;
 536                         tp->nxt = newhnamemem();
 537                         (void)sprintf(nambuf, "%s.%d", tp2->name, athost);
 538                         tp->name = savestr(nambuf);
 539                         return (tp->name);
 540                 }
 541
 542         tp->addr = (atnet << 8) | athost;
 543         tp->nxt = newhnamemem();
 544         if (athost != 255)
 545                 (void)sprintf(nambuf, "%d.%d.%d",
 546                     atnet >> 8, atnet & 0xff, athost);
 547         else
 548                 (void)sprintf(nambuf, "%d.%d", atnet >> 8, atnet & 0xff);
 549         tp->name = savestr(nambuf);
 550
 551         return (tp->name);
 552 }
 553
 554 static struct tok skt2str[] = {
 555         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 556         { nbpSkt,       "nis" },        /* name info socket */
 557         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 558         { zipSkt,       "zip" },        /* zone info protocol */
 559         { 0,            NULL }
 560 };
 561
 562 static const char *
 563 ddpskt_string(register int skt)
 564 {
 565         static char buf[8];
 566
 567         if (nflag) {
 568                 (void)sprintf(buf, "%d", skt);
 569                 return (buf);
 570         }
 571         return (tok2str(skt2str, "%d", skt));
 572 }