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 1.58 2000-09-28 06:42:55 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 #if __STDC__
  38 struct mbuf;
  39 struct rtentry;
  40 #endif
  41
  42 #include <netinet/in.h>
  43 #include <netinet/in_systm.h>
  44
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48
  49 #include "interface.h"
  50 #include "addrtoname.h"
  51 #include "ethertype.h"
  52 #include "extract.h"                    /* must come after interface.h */
  53 #include "appletalk.h"
  54 #include "savestr.h"
  55
  56 static struct tok type2str[] = {
  57         { ddpRTMP,              "rtmp" },
  58         { ddpRTMPrequest,       "rtmpReq" },
  59         { ddpECHO,              "echo" },
  60         { ddpIP,                "IP" },
  61         { ddpARP,               "ARP" },
  62         { ddpKLAP,              "KLAP" },
  63         { 0,                    NULL }
  64 };
  65
  66 struct aarp {
  67         u_int16_t       htype, ptype;
  68         u_int8_t        halen, palen;
  69         u_int16_t       op;
  70         u_int8_t        hsaddr[6];
  71         u_int8_t        psaddr[4];
  72         u_int8_t        hdaddr[6];
  73         u_int8_t        pdaddr[4];
  74 };
  75
  76 static char tstr[] = "[|atalk]";
  77
  78 static void atp_print(const struct atATP *, u_int);
  79 static void atp_bitmap_print(u_char);
  80 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  81 static const char *print_cstring(const char *, const u_char *);
  82 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  83                                                 const u_char *,
  84                                                 u_short, u_char, u_char);
  85 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  86                                                const u_char *);
  87 static const char *ataddr_string(u_short, u_char);
  88 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  89 static const char *ddpskt_string(int);
  90
  91 /*
  92  * Print AppleTalk Datagram Delivery Protocol packets.
  93  */
  94 void
  95 atalk_print(register const u_char *bp, u_int length)
  96 {
  97         register const struct LAP *lp;
  98         register const struct atDDP *dp;
  99         register const struct atShortDDP *sdp;
 100         u_short snet;
 101
 102         lp = (struct LAP *)bp;
 103         bp += sizeof(*lp);
 104         length -= sizeof(*lp);
 105         switch (lp->type) {
 106
 107         case lapShortDDP:
 108                 if (length < ddpSSize) {
 109                         (void)printf(" [|sddp %d]", length);
 110                         return;
 111                 }
 112                 sdp = (const struct atShortDDP *)bp;
 113                 printf("%s.%s",
 114                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 115                 printf(" > %s.%s:",
 116                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 117                 bp += ddpSSize;
 118                 length -= ddpSSize;
 119                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 120                 break;
 121
 122         case lapDDP:
 123                 if (length < ddpSize) {
 124                         (void)printf(" [|ddp %d]", length);
 125                         return;
 126                 }
 127                 dp = (const struct atDDP *)bp;
 128                 snet = EXTRACT_16BITS(&dp->srcNet);
 129                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 130                     ddpskt_string(dp->srcSkt));
 131                 printf(" > %s.%s:",
 132                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 133                     ddpskt_string(dp->dstSkt));
 134                 bp += ddpSize;
 135                 length -= ddpSize;
 136                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 137                 break;
 138
 139 #ifdef notdef
 140         case lapKLAP:
 141                 klap_print(bp, length);
 142                 break;
 143 #endif
 144
 145         default:
 146                 printf("%d > %d at-lap#%d %d",
 147                     lp->src, lp->dst, lp->type, length);
 148                 break;
 149         }
 150 }
 151
 152 /* XXX should probably pass in the snap header and do checks like arp_print() */
 153 void
 154 aarp_print(register const u_char *bp, u_int length)
 155 {
 156         register const struct aarp *ap;
 157
 158 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 159
 160         printf("aarp ");
 161         ap = (const struct aarp *)bp;
 162         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 163             ap->halen == 6 && ap->palen == 4 )
 164                 switch (ntohs(ap->op)) {
 165
 166                 case 1:                         /* request */
 167                         (void)printf("who-has %s tell %s",
 168                             AT(pdaddr), AT(psaddr));
 169                         return;
 170
 171                 case 2:                         /* response */
 172                         (void)printf("reply %s is-at %s",
 173                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 174                         return;
 175
 176                 case 3:                         /* probe (oy!) */
 177                         (void)printf("probe %s tell %s",
 178                             AT(pdaddr), AT(psaddr));
 179                         return;
 180                 }
 181         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 182             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 183             ap->halen, ap->palen);
 184 }
 185
 186 static void
 187 ddp_print(register const u_char *bp, register u_int length, register int t,
 188           register u_short snet, register u_char snode, u_char skt)
 189 {
 190
 191         switch (t) {
 192
 193         case ddpNBP:
 194                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 195                 break;
 196
 197         case ddpATP:
 198                 atp_print((const struct atATP *)bp, length);
 199                 break;
 200
 201         default:
 202                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 203                 break;
 204         }
 205 }
 206
 207 static void
 208 atp_print(register const struct atATP *ap, u_int length)
 209 {
 210         char c;
 211         u_int32_t data;
 212
 213         if ((const u_char *)(ap + 1) > snapend) {
 214                 /* Just bail if we don't have the whole chunk. */
 215                 fputs(tstr, stdout);
 216                 return;
 217         }
 218         length -= sizeof(*ap);
 219         switch (ap->control & 0xc0) {
 220
 221         case atpReqCode:
 222                 (void)printf(" atp-req%s %d",
 223                              ap->control & atpXO? " " : "*",
 224                              EXTRACT_16BITS(&ap->transID));
 225
 226                 atp_bitmap_print(ap->bitmap);
 227
 228                 if (length != 0)
 229                         (void)printf(" [len=%d]", length);
 230
 231                 switch (ap->control & (atpEOM|atpSTS)) {
 232                 case atpEOM:
 233                         (void)printf(" [EOM]");
 234                         break;
 235                 case atpSTS:
 236                         (void)printf(" [STS]");
 237                         break;
 238                 case atpEOM|atpSTS:
 239                         (void)printf(" [EOM,STS]");
 240                         break;
 241                 }
 242                 break;
 243
 244         case atpRspCode:
 245                 (void)printf(" atp-resp%s%d:%d (%d)",
 246                              ap->control & atpEOM? "*" : " ",
 247                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 248                 switch (ap->control & (atpXO|atpSTS)) {
 249                 case atpXO:
 250                         (void)printf(" [XO]");
 251                         break;
 252                 case atpSTS:
 253                         (void)printf(" [STS]");
 254                         break;
 255                 case atpXO|atpSTS:
 256                         (void)printf(" [XO,STS]");
 257                         break;
 258                 }
 259                 break;
 260
 261         case atpRelCode:
 262                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 263
 264                 atp_bitmap_print(ap->bitmap);
 265
 266                 /* length should be zero */
 267                 if (length)
 268                         (void)printf(" [len=%d]", length);
 269
 270                 /* there shouldn't be any control flags */
 271                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 272                         c = '[';
 273                         if (ap->control & atpXO) {
 274                                 (void)printf("%cXO", c);
 275                                 c = ',';
 276                         }
 277                         if (ap->control & atpEOM) {
 278                                 (void)printf("%cEOM", c);
 279                                 c = ',';
 280                         }
 281                         if (ap->control & atpSTS) {
 282                                 (void)printf("%cSTS", c);
 283                                 c = ',';
 284                         }
 285                         (void)printf("]");
 286                 }
 287                 break;
 288
 289         default:
 290                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 291                              EXTRACT_16BITS(&ap->transID), length);
 292                 break;
 293         }
 294         data = EXTRACT_32BITS(&ap->userData);
 295         if (data != 0)
 296                 (void)printf(" 0x%x", data);
 297 }
 298
 299 static void
 300 atp_bitmap_print(register u_char bm)
 301 {
 302         register char c;
 303         register int i;
 304
 305         /*
 306          * The '& 0xff' below is needed for compilers that want to sign
 307          * extend a u_char, which is the case with the Ultrix compiler.
 308          * (gcc is smart enough to eliminate it, at least on the Sparc).
 309          */
 310         if ((bm + 1) & (bm & 0xff)) {
 311                 c = '<';
 312                 for (i = 0; bm; ++i) {
 313                         if (bm & 1) {
 314                                 (void)printf("%c%d", c, i);
 315                                 c = ',';
 316                         }
 317                         bm >>= 1;
 318                 }
 319                 (void)printf(">");
 320         } else {
 321                 for (i = 0; bm; ++i)
 322                         bm >>= 1;
 323                 if (i > 1)
 324                         (void)printf("<0-%d>", i - 1);
 325                 else
 326                         (void)printf("<0>");
 327         }
 328 }
 329
 330 static void
 331 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 332           register u_char snode, register u_char skt)
 333 {
 334         register const struct atNBPtuple *tp =
 335                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 336         int i;
 337         const u_char *ep;
 338
 339         length -= nbpHeaderSize;
 340         if (length < 8) {
 341                 /* must be room for at least one tuple */
 342                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 343                 return;
 344         }
 345         /* ep points to end of available data */
 346         ep = snapend;
 347         if ((const u_char *)tp > ep) {
 348                 fputs(tstr, stdout);
 349                 return;
 350         }
 351         switch (i = np->control & 0xf0) {
 352
 353         case nbpBrRq:
 354         case nbpLkUp:
 355                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 356                              np->id);
 357                 if ((const u_char *)(tp + 1) > ep) {
 358                         fputs(tstr, stdout);
 359                         return;
 360                 }
 361                 (void)nbp_name_print(tp, ep);
 362                 /*
 363                  * look for anomalies: the spec says there can only
 364                  * be one tuple, the address must match the source
 365                  * address and the enumerator should be zero.
 366                  */
 367                 if ((np->control & 0xf) != 1)
 368                         (void)printf(" [ntup=%d]", np->control & 0xf);
 369                 if (tp->enumerator)
 370                         (void)printf(" [enum=%d]", tp->enumerator);
 371                 if (EXTRACT_16BITS(&tp->net) != snet ||
 372                     tp->node != snode || tp->skt != skt)
 373                         (void)printf(" [addr=%s.%d]",
 374                             ataddr_string(EXTRACT_16BITS(&tp->net),
 375                             tp->node), tp->skt);
 376                 break;
 377
 378         case nbpLkUpReply:
 379                 (void)printf(" nbp-reply %d:", np->id);
 380
 381                 /* print each of the tuples in the reply */
 382                 for (i = np->control & 0xf; --i >= 0 && tp; )
 383                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 384                 break;
 385
 386         default:
 387                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 388                                 length);
 389                 break;
 390         }
 391 }
 392
 393 /* print a counted string */
 394 static const char *
 395 print_cstring(register const char *cp, register const u_char *ep)
 396 {
 397         register u_int length;
 398
 399         if (cp >= (const char *)ep) {
 400                 fputs(tstr, stdout);
 401                 return (0);
 402         }
 403         length = *cp++;
 404
 405         /* Spec says string can be at most 32 bytes long */
 406         if (length > 32) {
 407                 (void)printf("[len=%u]", length);
 408                 return (0);
 409         }
 410         while ((int)--length >= 0) {
 411                 if (cp >= (char *)ep) {
 412                         fputs(tstr, stdout);
 413                         return (0);
 414                 }
 415                 putchar(*cp++);
 416         }
 417         return (cp);
 418 }
 419
 420 static const struct atNBPtuple *
 421 nbp_tuple_print(register const struct atNBPtuple *tp,
 422                 register const u_char *ep,
 423                 register u_short snet, register u_char snode,
 424                 register u_char skt)
 425 {
 426         register const struct atNBPtuple *tpn;
 427
 428         if ((const u_char *)(tp + 1) > ep) {
 429                 fputs(tstr, stdout);
 430                 return 0;
 431         }
 432         tpn = nbp_name_print(tp, ep);
 433
 434         /* if the enumerator isn't 1, print it */
 435         if (tp->enumerator != 1)
 436                 (void)printf("(%d)", tp->enumerator);
 437
 438         /* if the socket doesn't match the src socket, print it */
 439         if (tp->skt != skt)
 440                 (void)printf(" %d", tp->skt);
 441
 442         /* if the address doesn't match the src address, it's an anomaly */
 443         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 444                 (void)printf(" [addr=%s]",
 445                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 446
 447         return (tpn);
 448 }
 449
 450 static const struct atNBPtuple *
 451 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 452 {
 453         register const char *cp = (const char *)tp + nbpTupleSize;
 454
 455         putchar(' ');
 456
 457         /* Object */
 458         putchar('"');
 459         if ((cp = print_cstring(cp, ep)) != NULL) {
 460                 /* Type */
 461                 putchar(':');
 462                 if ((cp = print_cstring(cp, ep)) != NULL) {
 463                         /* Zone */
 464                         putchar('@');
 465                         if ((cp = print_cstring(cp, ep)) != NULL)
 466                                 putchar('"');
 467                 }
 468         }
 469         return ((const struct atNBPtuple *)cp);
 470 }
 471
 472
 473 #define HASHNAMESIZE 4096
 474
 475 struct hnamemem {
 476         int addr;
 477         char *name;
 478         struct hnamemem *nxt;
 479 };
 480
 481 static struct hnamemem hnametable[HASHNAMESIZE];
 482
 483 static const char *
 484 ataddr_string(u_short atnet, u_char athost)
 485 {
 486         register struct hnamemem *tp, *tp2;
 487         register int i = (atnet << 8) | athost;
 488         char nambuf[256];
 489         static int first = 1;
 490         FILE *fp;
 491
 492         /*
 493          * if this is the first call, see if there's an AppleTalk
 494          * number to name map file.
 495          */
 496         if (first && (first = 0, !nflag)
 497             && (fp = fopen("/etc/atalk.names", "r"))) {
 498                 char line[256];
 499                 int i1, i2, i3;
 500
 501                 while (fgets(line, sizeof(line), fp)) {
 502                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 503                                 continue;
 504                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 505                                      nambuf) == 4)
 506                                 /* got a hostname. */
 507                                 i3 |= ((i1 << 8) | i2) << 8;
 508                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 509                                         nambuf) == 3)
 510                                 /* got a net name */
 511                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 512                         else
 513                                 continue;
 514
 515                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 516                              tp->nxt; tp = tp->nxt)
 517                                 ;
 518                         tp->addr = i3;
 519                         tp->nxt = newhnamemem();
 520                         tp->name = savestr(nambuf);
 521                 }
 522                 fclose(fp);
 523         }
 524
 525         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 526                 if (tp->addr == i)
 527                         return (tp->name);
 528
 529         /* didn't have the node name -- see if we've got the net name */
 530         i |= 255;
 531         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 532                 if (tp2->addr == i) {
 533                         tp->addr = (atnet << 8) | athost;
 534                         tp->nxt = newhnamemem();
 535                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 536                             tp2->name, athost);
 537                         tp->name = savestr(nambuf);
 538                         return (tp->name);
 539                 }
 540
 541         tp->addr = (atnet << 8) | athost;
 542         tp->nxt = newhnamemem();
 543         if (athost != 255)
 544                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 545                     atnet >> 8, atnet & 0xff, athost);
 546         else
 547                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 548                     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)snprintf(buf, sizeof(buf), "%d", skt);
 569                 return (buf);
 570         }
 571         return (tok2str(skt2str, "%d", skt));
 572 }