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 1.48 1999-10-07 23:47:11 mcr 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 #include <netinet/tcpip.h>
  48
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52
  53 #include "interface.h"
  54 #include "addrtoname.h"
  55 #include "ethertype.h"
  56 #include "extract.h"                    /* must come after interface.h */
  57 #include "appletalk.h"
  58 #include "savestr.h"
  59
  60 static struct tok type2str[] = {
  61         { ddpRTMP,              "rtmp" },
  62         { ddpRTMPrequest,       "rtmpReq" },
  63         { ddpECHO,              "echo" },
  64         { ddpIP,                "IP" },
  65         { ddpARP,               "ARP" },
  66         { ddpKLAP,              "KLAP" },
  67         { 0,                    NULL }
  68 };
  69
  70 struct aarp {
  71         u_short htype, ptype;
  72         u_char  halen, palen;
  73         u_short op;
  74         u_char  hsaddr[6];
  75         u_char  psaddr[4];
  76         u_char  hdaddr[6];
  77         u_char  pdaddr[4];
  78 };
  79
  80 static char tstr[] = "[|atalk]";
  81
  82 static void atp_print(const struct atATP *, u_int);
  83 static void atp_bitmap_print(u_char);
  84 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  85 static const char *print_cstring(const char *, const u_char *);
  86 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  87                                                 const u_char *,
  88                                                 u_short, u_char, u_char);
  89 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  90                                                const u_char *);
  91 static const char *ataddr_string(u_short, u_char);
  92 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  93 static const char *ddpskt_string(int);
  94
  95 /*
  96  * Print AppleTalk Datagram Delivery Protocol packets.
  97  */
  98 void
  99 atalk_print(register const u_char *bp, u_int length)
 100 {
 101         register const struct LAP *lp;
 102         register const struct atDDP *dp;
 103         register const struct atShortDDP *sdp;
 104         u_short snet;
 105
 106         lp = (struct LAP *)bp;
 107         bp += sizeof(*lp);
 108         length -= sizeof(*lp);
 109         switch (lp->type) {
 110
 111         case lapShortDDP:
 112                 if (length < ddpSSize) {
 113                         (void)printf(" [|sddp %d]", length);
 114                         return;
 115                 }
 116                 sdp = (const struct atShortDDP *)bp;
 117                 printf("%s.%s",
 118                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 119                 printf(" > %s.%s:",
 120                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 121                 bp += ddpSSize;
 122                 length -= ddpSSize;
 123                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 124                 break;
 125
 126         case lapDDP:
 127                 if (length < ddpSize) {
 128                         (void)printf(" [|ddp %d]", length);
 129                         return;
 130                 }
 131                 dp = (const struct atDDP *)bp;
 132                 snet = EXTRACT_16BITS(&dp->srcNet);
 133                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 134                     ddpskt_string(dp->srcSkt));
 135                 printf(" > %s.%s:",
 136                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 137                     ddpskt_string(dp->dstSkt));
 138                 bp += ddpSize;
 139                 length -= ddpSize;
 140                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 141                 break;
 142
 143 #ifdef notdef
 144         case lapKLAP:
 145                 klap_print(bp, length);
 146                 break;
 147 #endif
 148
 149         default:
 150                 printf("%d > %d at-lap#%d %d",
 151                     lp->src, lp->dst, lp->type, length);
 152                 break;
 153         }
 154 }
 155
 156 /* XXX should probably pass in the snap header and do checks like arp_print() */
 157 void
 158 aarp_print(register const u_char *bp, u_int length)
 159 {
 160         register const struct aarp *ap;
 161
 162 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 163
 164         printf("aarp ");
 165         ap = (const struct aarp *)bp;
 166         if (ap->htype == 1 && ap->ptype == ETHERTYPE_ATALK &&
 167             ap->halen == 6 && ap->palen == 4 )
 168                 switch (ap->op) {
 169
 170                 case 1:                         /* request */
 171                         (void)printf("who-has %s tell %s",
 172                             AT(pdaddr), AT(psaddr));
 173                         return;
 174
 175                 case 2:                         /* response */
 176                         (void)printf("reply %s is-at %s",
 177                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 178                         return;
 179
 180                 case 3:                         /* probe (oy!) */
 181                         (void)printf("probe %s tell %s",
 182                             AT(pdaddr), AT(psaddr));
 183                         return;
 184                 }
 185         (void)printf("len %d op %d htype %d ptype %#x halen %d palen %d",
 186             length, ap->op, ap->htype, ap->ptype, ap->halen, ap->palen );
 187 }
 188
 189 static void
 190 ddp_print(register const u_char *bp, register u_int length, register int t,
 191           register u_short snet, register u_char snode, u_char skt)
 192 {
 193
 194         switch (t) {
 195
 196         case ddpNBP:
 197                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 198                 break;
 199
 200         case ddpATP:
 201                 atp_print((const struct atATP *)bp, length);
 202                 break;
 203
 204         default:
 205                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 206                 break;
 207         }
 208 }
 209
 210 static void
 211 atp_print(register const struct atATP *ap, u_int length)
 212 {
 213         char c;
 214         u_int32_t data;
 215
 216         if ((const u_char *)(ap + 1) > snapend) {
 217                 /* Just bail if we don't have the whole chunk. */
 218                 fputs(tstr, stdout);
 219                 return;
 220         }
 221         length -= sizeof(*ap);
 222         switch (ap->control & 0xc0) {
 223
 224         case atpReqCode:
 225                 (void)printf(" atp-req%s %d",
 226                              ap->control & atpXO? " " : "*",
 227                              EXTRACT_16BITS(&ap->transID));
 228
 229                 atp_bitmap_print(ap->bitmap);
 230
 231                 if (length != 0)
 232                         (void)printf(" [len=%d]", length);
 233
 234                 switch (ap->control & (atpEOM|atpSTS)) {
 235                 case atpEOM:
 236                         (void)printf(" [EOM]");
 237                         break;
 238                 case atpSTS:
 239                         (void)printf(" [STS]");
 240                         break;
 241                 case atpEOM|atpSTS:
 242                         (void)printf(" [EOM,STS]");
 243                         break;
 244                 }
 245                 break;
 246
 247         case atpRspCode:
 248                 (void)printf(" atp-resp%s%d:%d (%d)",
 249                              ap->control & atpEOM? "*" : " ",
 250                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 251                 switch (ap->control & (atpXO|atpSTS)) {
 252                 case atpXO:
 253                         (void)printf(" [XO]");
 254                         break;
 255                 case atpSTS:
 256                         (void)printf(" [STS]");
 257                         break;
 258                 case atpXO|atpSTS:
 259                         (void)printf(" [XO,STS]");
 260                         break;
 261                 }
 262                 break;
 263
 264         case atpRelCode:
 265                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 266
 267                 atp_bitmap_print(ap->bitmap);
 268
 269                 /* length should be zero */
 270                 if (length)
 271                         (void)printf(" [len=%d]", length);
 272
 273                 /* there shouldn't be any control flags */
 274                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 275                         c = '[';
 276                         if (ap->control & atpXO) {
 277                                 (void)printf("%cXO", c);
 278                                 c = ',';
 279                         }
 280                         if (ap->control & atpEOM) {
 281                                 (void)printf("%cEOM", c);
 282                                 c = ',';
 283                         }
 284                         if (ap->control & atpSTS) {
 285                                 (void)printf("%cSTS", c);
 286                                 c = ',';
 287                         }
 288                         (void)printf("]");
 289                 }
 290                 break;
 291
 292         default:
 293                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 294                              EXTRACT_16BITS(&ap->transID), length);
 295                 break;
 296         }
 297         data = EXTRACT_32BITS(&ap->userData);
 298         if (data != 0)
 299                 (void)printf(" 0x%x", data);
 300 }
 301
 302 static void
 303 atp_bitmap_print(register u_char bm)
 304 {
 305         register char c;
 306         register int i;
 307
 308         /*
 309          * The '& 0xff' below is needed for compilers that want to sign
 310          * extend a u_char, which is the case with the Ultrix compiler.
 311          * (gcc is smart enough to eliminate it, at least on the Sparc).
 312          */
 313         if ((bm + 1) & (bm & 0xff)) {
 314                 c = '<';
 315                 for (i = 0; bm; ++i) {
 316                         if (bm & 1) {
 317                                 (void)printf("%c%d", c, i);
 318                                 c = ',';
 319                         }
 320                         bm >>= 1;
 321                 }
 322                 (void)printf(">");
 323         } else {
 324                 for (i = 0; bm; ++i)
 325                         bm >>= 1;
 326                 if (i > 1)
 327                         (void)printf("<0-%d>", i - 1);
 328                 else
 329                         (void)printf("<0>");
 330         }
 331 }
 332
 333 static void
 334 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 335           register u_char snode, register u_char skt)
 336 {
 337         register const struct atNBPtuple *tp =
 338                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 339         int i;
 340         const u_char *ep;
 341
 342         length -= nbpHeaderSize;
 343         if (length < 8) {
 344                 /* must be room for at least one tuple */
 345                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 346                 return;
 347         }
 348         /* ep points to end of available data */
 349         ep = snapend;
 350         if ((const u_char *)tp > ep) {
 351                 fputs(tstr, stdout);
 352                 return;
 353         }
 354         switch (i = np->control & 0xf0) {
 355
 356         case nbpBrRq:
 357         case nbpLkUp:
 358                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 359                              np->id);
 360                 if ((const u_char *)(tp + 1) > ep) {
 361                         fputs(tstr, stdout);
 362                         return;
 363                 }
 364                 (void)nbp_name_print(tp, ep);
 365                 /*
 366                  * look for anomalies: the spec says there can only
 367                  * be one tuple, the address must match the source
 368                  * address and the enumerator should be zero.
 369                  */
 370                 if ((np->control & 0xf) != 1)
 371                         (void)printf(" [ntup=%d]", np->control & 0xf);
 372                 if (tp->enumerator)
 373                         (void)printf(" [enum=%d]", tp->enumerator);
 374                 if (EXTRACT_16BITS(&tp->net) != snet ||
 375                     tp->node != snode || tp->skt != skt)
 376                         (void)printf(" [addr=%s.%d]",
 377                             ataddr_string(EXTRACT_16BITS(&tp->net),
 378                             tp->node), tp->skt);
 379                 break;
 380
 381         case nbpLkUpReply:
 382                 (void)printf(" nbp-reply %d:", np->id);
 383
 384                 /* print each of the tuples in the reply */
 385                 for (i = np->control & 0xf; --i >= 0 && tp; )
 386                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 387                 break;
 388
 389         default:
 390                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 391                                 length);
 392                 break;
 393         }
 394 }
 395
 396 /* print a counted string */
 397 static const char *
 398 print_cstring(register const char *cp, register const u_char *ep)
 399 {
 400         register u_int length;
 401
 402         if (cp >= (const char *)ep) {
 403                 fputs(tstr, stdout);
 404                 return (0);
 405         }
 406         length = *cp++;
 407
 408         /* Spec says string can be at most 32 bytes long */
 409         if (length > 32) {
 410                 (void)printf("[len=%u]", length);
 411                 return (0);
 412         }
 413         while ((int)--length >= 0) {
 414                 if (cp >= (char *)ep) {
 415                         fputs(tstr, stdout);
 416                         return (0);
 417                 }
 418                 putchar(*cp++);
 419         }
 420         return (cp);
 421 }
 422
 423 static const struct atNBPtuple *
 424 nbp_tuple_print(register const struct atNBPtuple *tp,
 425                 register const u_char *ep,
 426                 register u_short snet, register u_char snode,
 427                 register u_char skt)
 428 {
 429         register const struct atNBPtuple *tpn;
 430
 431         if ((const u_char *)(tp + 1) > ep) {
 432                 fputs(tstr, stdout);
 433                 return 0;
 434         }
 435         tpn = nbp_name_print(tp, ep);
 436
 437         /* if the enumerator isn't 1, print it */
 438         if (tp->enumerator != 1)
 439                 (void)printf("(%d)", tp->enumerator);
 440
 441         /* if the socket doesn't match the src socket, print it */
 442         if (tp->skt != skt)
 443                 (void)printf(" %d", tp->skt);
 444
 445         /* if the address doesn't match the src address, it's an anomaly */
 446         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 447                 (void)printf(" [addr=%s]",
 448                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 449
 450         return (tpn);
 451 }
 452
 453 static const struct atNBPtuple *
 454 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 455 {
 456         register const char *cp = (const char *)tp + nbpTupleSize;
 457
 458         putchar(' ');
 459
 460         /* Object */
 461         putchar('"');
 462         if ((cp = print_cstring(cp, ep)) != NULL) {
 463                 /* Type */
 464                 putchar(':');
 465                 if ((cp = print_cstring(cp, ep)) != NULL) {
 466                         /* Zone */
 467                         putchar('@');
 468                         if ((cp = print_cstring(cp, ep)) != NULL)
 469                                 putchar('"');
 470                 }
 471         }
 472         return ((const struct atNBPtuple *)cp);
 473 }
 474
 475
 476 #define HASHNAMESIZE 4096
 477
 478 struct hnamemem {
 479         int addr;
 480         char *name;
 481         struct hnamemem *nxt;
 482 };
 483
 484 static struct hnamemem hnametable[HASHNAMESIZE];
 485
 486 static const char *
 487 ataddr_string(u_short atnet, u_char athost)
 488 {
 489         register struct hnamemem *tp, *tp2;
 490         register int i = (atnet << 8) | athost;
 491         char nambuf[256];
 492         static int first = 1;
 493         FILE *fp;
 494
 495         /*
 496          * if this is the first call, see if there's an AppleTalk
 497          * number to name map file.
 498          */
 499         if (first && (first = 0, !nflag)
 500             && (fp = fopen("/etc/atalk.names", "r"))) {
 501                 char line[256];
 502                 int i1, i2, i3;
 503
 504                 while (fgets(line, sizeof(line), fp)) {
 505                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 506                                 continue;
 507                         if (sscanf(line, "%d.%d.%d %s", &i1, &i2, &i3,
 508                                      nambuf) == 4)
 509                                 /* got a hostname. */
 510                                 i3 |= ((i1 << 8) | i2) << 8;
 511                         else if (sscanf(line, "%d.%d %s", &i1, &i2,
 512                                         nambuf) == 3)
 513                                 /* got a net name */
 514                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 515                         else
 516                                 continue;
 517
 518                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 519                              tp->nxt; tp = tp->nxt)
 520                                 ;
 521                         tp->addr = i3;
 522                         tp->nxt = newhnamemem();
 523                         tp->name = savestr(nambuf);
 524                 }
 525                 fclose(fp);
 526         }
 527
 528         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 529                 if (tp->addr == i)
 530                         return (tp->name);
 531
 532         /* didn't have the node name -- see if we've got the net name */
 533         i |= 255;
 534         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 535                 if (tp2->addr == i) {
 536                         tp->addr = (atnet << 8) | athost;
 537                         tp->nxt = newhnamemem();
 538                         (void)sprintf(nambuf, "%s.%d", tp2->name, athost);
 539                         tp->name = savestr(nambuf);
 540                         return (tp->name);
 541                 }
 542
 543         tp->addr = (atnet << 8) | athost;
 544         tp->nxt = newhnamemem();
 545         if (athost != 255)
 546                 (void)sprintf(nambuf, "%d.%d.%d",
 547                     atnet >> 8, atnet & 0xff, athost);
 548         else
 549                 (void)sprintf(nambuf, "%d.%d", atnet >> 8, atnet & 0xff);
 550         tp->name = savestr(nambuf);
 551
 552         return (tp->name);
 553 }
 554
 555 static struct tok skt2str[] = {
 556         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 557         { nbpSkt,       "nis" },        /* name info socket */
 558         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 559         { zipSkt,       "zip" },        /* zone info protocol */
 560         { 0,            NULL }
 561 };
 562
 563 static const char *
 564 ddpskt_string(register int skt)
 565 {
 566         static char buf[8];
 567
 568         if (nflag) {
 569                 (void)sprintf(buf, "%d", skt);
 570                 return (buf);
 571         }
 572         return (tok2str(skt2str, "%d", skt));
 573 }