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 1.57 2000-09-23 08:54:25 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 #include <net/if.h>
  42
  43 #include <netinet/in.h>
  44 #include <netinet/in_systm.h>
  45
  46 #include <stdio.h>
  47 #include <stdlib.h>
  48 #include <string.h>
  49
  50 #include "interface.h"
  51 #include "addrtoname.h"
  52 #include "ethertype.h"
  53 #include "extract.h"                    /* must come after interface.h */
  54 #include "appletalk.h"
  55 #include "savestr.h"
  56
  57 static struct tok type2str[] = {
  58         { ddpRTMP,              "rtmp" },
  59         { ddpRTMPrequest,       "rtmpReq" },
  60         { ddpECHO,              "echo" },
  61         { ddpIP,                "IP" },
  62         { ddpARP,               "ARP" },
  63         { ddpKLAP,              "KLAP" },
  64         { 0,                    NULL }
  65 };
  66
  67 struct aarp {
  68         u_int16_t       htype, ptype;
  69         u_int8_t        halen, palen;
  70         u_int16_t       op;
  71         u_int8_t        hsaddr[6];
  72         u_int8_t        psaddr[4];
  73         u_int8_t        hdaddr[6];
  74         u_int8_t        pdaddr[4];
  75 };
  76
  77 static char tstr[] = "[|atalk]";
  78
  79 static void atp_print(const struct atATP *, u_int);
  80 static void atp_bitmap_print(u_char);
  81 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  82 static const char *print_cstring(const char *, const u_char *);
  83 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  84                                                 const u_char *,
  85                                                 u_short, u_char, u_char);
  86 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  87                                                const u_char *);
  88 static const char *ataddr_string(u_short, u_char);
  89 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  90 static const char *ddpskt_string(int);
  91
  92 /*
  93  * Print AppleTalk Datagram Delivery Protocol packets.
  94  */
  95 void
  96 atalk_print(register const u_char *bp, u_int length)
  97 {
  98         register const struct LAP *lp;
  99         register const struct atDDP *dp;
 100         register const struct atShortDDP *sdp;
 101         u_short snet;
 102
 103         lp = (struct LAP *)bp;
 104         bp += sizeof(*lp);
 105         length -= sizeof(*lp);
 106         switch (lp->type) {
 107
 108         case lapShortDDP:
 109                 if (length < ddpSSize) {
 110                         (void)printf(" [|sddp %d]", length);
 111                         return;
 112                 }
 113                 sdp = (const struct atShortDDP *)bp;
 114                 printf("%s.%s",
 115                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 116                 printf(" > %s.%s:",
 117                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 118                 bp += ddpSSize;
 119                 length -= ddpSSize;
 120                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 121                 break;
 122
 123         case lapDDP:
 124                 if (length < ddpSize) {
 125                         (void)printf(" [|ddp %d]", length);
 126                         return;
 127                 }
 128                 dp = (const struct atDDP *)bp;
 129                 snet = EXTRACT_16BITS(&dp->srcNet);
 130                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 131                     ddpskt_string(dp->srcSkt));
 132                 printf(" > %s.%s:",
 133                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 134                     ddpskt_string(dp->dstSkt));
 135                 bp += ddpSize;
 136                 length -= ddpSize;
 137                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 138                 break;
 139
 140 #ifdef notdef
 141         case lapKLAP:
 142                 klap_print(bp, length);
 143                 break;
 144 #endif
 145
 146         default:
 147                 printf("%d > %d at-lap#%d %d",
 148                     lp->src, lp->dst, lp->type, length);
 149                 break;
 150         }
 151 }
 152
 153 /* XXX should probably pass in the snap header and do checks like arp_print() */
 154 void
 155 aarp_print(register const u_char *bp, u_int length)
 156 {
 157         register const struct aarp *ap;
 158
 159 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 160
 161         printf("aarp ");
 162         ap = (const struct aarp *)bp;
 163         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 164             ap->halen == 6 && ap->palen == 4 )
 165                 switch (ntohs(ap->op)) {
 166
 167                 case 1:                         /* request */
 168                         (void)printf("who-has %s tell %s",
 169                             AT(pdaddr), AT(psaddr));
 170                         return;
 171
 172                 case 2:                         /* response */
 173                         (void)printf("reply %s is-at %s",
 174                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 175                         return;
 176
 177                 case 3:                         /* probe (oy!) */
 178                         (void)printf("probe %s tell %s",
 179                             AT(pdaddr), AT(psaddr));
 180                         return;
 181                 }
 182         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 183             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 184             ap->halen, ap->palen);
 185 }
 186
 187 static void
 188 ddp_print(register const u_char *bp, register u_int length, register int t,
 189           register u_short snet, register u_char snode, u_char skt)
 190 {
 191
 192         switch (t) {
 193
 194         case ddpNBP:
 195                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 196                 break;
 197
 198         case ddpATP:
 199                 atp_print((const struct atATP *)bp, length);
 200                 break;
 201
 202         default:
 203                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 204                 break;
 205         }
 206 }
 207
 208 static void
 209 atp_print(register const struct atATP *ap, u_int length)
 210 {
 211         char c;
 212         u_int32_t data;
 213
 214         if ((const u_char *)(ap + 1) > snapend) {
 215                 /* Just bail if we don't have the whole chunk. */
 216                 fputs(tstr, stdout);
 217                 return;
 218         }
 219         length -= sizeof(*ap);
 220         switch (ap->control & 0xc0) {
 221
 222         case atpReqCode:
 223                 (void)printf(" atp-req%s %d",
 224                              ap->control & atpXO? " " : "*",
 225                              EXTRACT_16BITS(&ap->transID));
 226
 227                 atp_bitmap_print(ap->bitmap);
 228
 229                 if (length != 0)
 230                         (void)printf(" [len=%d]", length);
 231
 232                 switch (ap->control & (atpEOM|atpSTS)) {
 233                 case atpEOM:
 234                         (void)printf(" [EOM]");
 235                         break;
 236                 case atpSTS:
 237                         (void)printf(" [STS]");
 238                         break;
 239                 case atpEOM|atpSTS:
 240                         (void)printf(" [EOM,STS]");
 241                         break;
 242                 }
 243                 break;
 244
 245         case atpRspCode:
 246                 (void)printf(" atp-resp%s%d:%d (%d)",
 247                              ap->control & atpEOM? "*" : " ",
 248                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 249                 switch (ap->control & (atpXO|atpSTS)) {
 250                 case atpXO:
 251                         (void)printf(" [XO]");
 252                         break;
 253                 case atpSTS:
 254                         (void)printf(" [STS]");
 255                         break;
 256                 case atpXO|atpSTS:
 257                         (void)printf(" [XO,STS]");
 258                         break;
 259                 }
 260                 break;
 261
 262         case atpRelCode:
 263                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 264
 265                 atp_bitmap_print(ap->bitmap);
 266
 267                 /* length should be zero */
 268                 if (length)
 269                         (void)printf(" [len=%d]", length);
 270
 271                 /* there shouldn't be any control flags */
 272                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 273                         c = '[';
 274                         if (ap->control & atpXO) {
 275                                 (void)printf("%cXO", c);
 276                                 c = ',';
 277                         }
 278                         if (ap->control & atpEOM) {
 279                                 (void)printf("%cEOM", c);
 280                                 c = ',';
 281                         }
 282                         if (ap->control & atpSTS) {
 283                                 (void)printf("%cSTS", c);
 284                                 c = ',';
 285                         }
 286                         (void)printf("]");
 287                 }
 288                 break;
 289
 290         default:
 291                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 292                              EXTRACT_16BITS(&ap->transID), length);
 293                 break;
 294         }
 295         data = EXTRACT_32BITS(&ap->userData);
 296         if (data != 0)
 297                 (void)printf(" 0x%x", data);
 298 }
 299
 300 static void
 301 atp_bitmap_print(register u_char bm)
 302 {
 303         register char c;
 304         register int i;
 305
 306         /*
 307          * The '& 0xff' below is needed for compilers that want to sign
 308          * extend a u_char, which is the case with the Ultrix compiler.
 309          * (gcc is smart enough to eliminate it, at least on the Sparc).
 310          */
 311         if ((bm + 1) & (bm & 0xff)) {
 312                 c = '<';
 313                 for (i = 0; bm; ++i) {
 314                         if (bm & 1) {
 315                                 (void)printf("%c%d", c, i);
 316                                 c = ',';
 317                         }
 318                         bm >>= 1;
 319                 }
 320                 (void)printf(">");
 321         } else {
 322                 for (i = 0; bm; ++i)
 323                         bm >>= 1;
 324                 if (i > 1)
 325                         (void)printf("<0-%d>", i - 1);
 326                 else
 327                         (void)printf("<0>");
 328         }
 329 }
 330
 331 static void
 332 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 333           register u_char snode, register u_char skt)
 334 {
 335         register const struct atNBPtuple *tp =
 336                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 337         int i;
 338         const u_char *ep;
 339
 340         length -= nbpHeaderSize;
 341         if (length < 8) {
 342                 /* must be room for at least one tuple */
 343                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 344                 return;
 345         }
 346         /* ep points to end of available data */
 347         ep = snapend;
 348         if ((const u_char *)tp > ep) {
 349                 fputs(tstr, stdout);
 350                 return;
 351         }
 352         switch (i = np->control & 0xf0) {
 353
 354         case nbpBrRq:
 355         case nbpLkUp:
 356                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 357                              np->id);
 358                 if ((const u_char *)(tp + 1) > ep) {
 359                         fputs(tstr, stdout);
 360                         return;
 361                 }
 362                 (void)nbp_name_print(tp, ep);
 363                 /*
 364                  * look for anomalies: the spec says there can only
 365                  * be one tuple, the address must match the source
 366                  * address and the enumerator should be zero.
 367                  */
 368                 if ((np->control & 0xf) != 1)
 369                         (void)printf(" [ntup=%d]", np->control & 0xf);
 370                 if (tp->enumerator)
 371                         (void)printf(" [enum=%d]", tp->enumerator);
 372                 if (EXTRACT_16BITS(&tp->net) != snet ||
 373                     tp->node != snode || tp->skt != skt)
 374                         (void)printf(" [addr=%s.%d]",
 375                             ataddr_string(EXTRACT_16BITS(&tp->net),
 376                             tp->node), tp->skt);
 377                 break;
 378
 379         case nbpLkUpReply:
 380                 (void)printf(" nbp-reply %d:", np->id);
 381
 382                 /* print each of the tuples in the reply */
 383                 for (i = np->control & 0xf; --i >= 0 && tp; )
 384                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 385                 break;
 386
 387         default:
 388                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 389                                 length);
 390                 break;
 391         }
 392 }
 393
 394 /* print a counted string */
 395 static const char *
 396 print_cstring(register const char *cp, register const u_char *ep)
 397 {
 398         register u_int length;
 399
 400         if (cp >= (const char *)ep) {
 401                 fputs(tstr, stdout);
 402                 return (0);
 403         }
 404         length = *cp++;
 405
 406         /* Spec says string can be at most 32 bytes long */
 407         if (length > 32) {
 408                 (void)printf("[len=%u]", length);
 409                 return (0);
 410         }
 411         while ((int)--length >= 0) {
 412                 if (cp >= (char *)ep) {
 413                         fputs(tstr, stdout);
 414                         return (0);
 415                 }
 416                 putchar(*cp++);
 417         }
 418         return (cp);
 419 }
 420
 421 static const struct atNBPtuple *
 422 nbp_tuple_print(register const struct atNBPtuple *tp,
 423                 register const u_char *ep,
 424                 register u_short snet, register u_char snode,
 425                 register u_char skt)
 426 {
 427         register const struct atNBPtuple *tpn;
 428
 429         if ((const u_char *)(tp + 1) > ep) {
 430                 fputs(tstr, stdout);
 431                 return 0;
 432         }
 433         tpn = nbp_name_print(tp, ep);
 434
 435         /* if the enumerator isn't 1, print it */
 436         if (tp->enumerator != 1)
 437                 (void)printf("(%d)", tp->enumerator);
 438
 439         /* if the socket doesn't match the src socket, print it */
 440         if (tp->skt != skt)
 441                 (void)printf(" %d", tp->skt);
 442
 443         /* if the address doesn't match the src address, it's an anomaly */
 444         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 445                 (void)printf(" [addr=%s]",
 446                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 447
 448         return (tpn);
 449 }
 450
 451 static const struct atNBPtuple *
 452 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 453 {
 454         register const char *cp = (const char *)tp + nbpTupleSize;
 455
 456         putchar(' ');
 457
 458         /* Object */
 459         putchar('"');
 460         if ((cp = print_cstring(cp, ep)) != NULL) {
 461                 /* Type */
 462                 putchar(':');
 463                 if ((cp = print_cstring(cp, ep)) != NULL) {
 464                         /* Zone */
 465                         putchar('@');
 466                         if ((cp = print_cstring(cp, ep)) != NULL)
 467                                 putchar('"');
 468                 }
 469         }
 470         return ((const struct atNBPtuple *)cp);
 471 }
 472
 473
 474 #define HASHNAMESIZE 4096
 475
 476 struct hnamemem {
 477         int addr;
 478         char *name;
 479         struct hnamemem *nxt;
 480 };
 481
 482 static struct hnamemem hnametable[HASHNAMESIZE];
 483
 484 static const char *
 485 ataddr_string(u_short atnet, u_char athost)
 486 {
 487         register struct hnamemem *tp, *tp2;
 488         register int i = (atnet << 8) | athost;
 489         char nambuf[256];
 490         static int first = 1;
 491         FILE *fp;
 492
 493         /*
 494          * if this is the first call, see if there's an AppleTalk
 495          * number to name map file.
 496          */
 497         if (first && (first = 0, !nflag)
 498             && (fp = fopen("/etc/atalk.names", "r"))) {
 499                 char line[256];
 500                 int i1, i2, i3;
 501
 502                 while (fgets(line, sizeof(line), fp)) {
 503                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 504                                 continue;
 505                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 506                                      nambuf) == 4)
 507                                 /* got a hostname. */
 508                                 i3 |= ((i1 << 8) | i2) << 8;
 509                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 510                                         nambuf) == 3)
 511                                 /* got a net name */
 512                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 513                         else
 514                                 continue;
 515
 516                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 517                              tp->nxt; tp = tp->nxt)
 518                                 ;
 519                         tp->addr = i3;
 520                         tp->nxt = newhnamemem();
 521                         tp->name = savestr(nambuf);
 522                 }
 523                 fclose(fp);
 524         }
 525
 526         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 527                 if (tp->addr == i)
 528                         return (tp->name);
 529
 530         /* didn't have the node name -- see if we've got the net name */
 531         i |= 255;
 532         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 533                 if (tp2->addr == i) {
 534                         tp->addr = (atnet << 8) | athost;
 535                         tp->nxt = newhnamemem();
 536                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 537                             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)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 546                     atnet >> 8, atnet & 0xff, athost);
 547         else
 548                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 549                     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)snprintf(buf, sizeof(buf), "%d", skt);
 570                 return (buf);
 571         }
 572         return (tok2str(skt2str, "%d", skt));
 573 }