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 1.61 2000-10-06 04:23:10 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
  43 #include "interface.h"
  44 #include "addrtoname.h"
  45 #include "ethertype.h"
  46 #include "extract.h"                    /* must come after interface.h */
  47 #include "appletalk.h"
  48 #include "savestr.h"
  49
  50 static struct tok type2str[] = {
  51         { ddpRTMP,              "rtmp" },
  52         { ddpRTMPrequest,       "rtmpReq" },
  53         { ddpECHO,              "echo" },
  54         { ddpIP,                "IP" },
  55         { ddpARP,               "ARP" },
  56         { ddpKLAP,              "KLAP" },
  57         { 0,                    NULL }
  58 };
  59
  60 struct aarp {
  61         u_int16_t       htype, ptype;
  62         u_int8_t        halen, palen;
  63         u_int16_t       op;
  64         u_int8_t        hsaddr[6];
  65         u_int8_t        psaddr[4];
  66         u_int8_t        hdaddr[6];
  67         u_int8_t        pdaddr[4];
  68 };
  69
  70 static char tstr[] = "[|atalk]";
  71
  72 static void atp_print(const struct atATP *, u_int);
  73 static void atp_bitmap_print(u_char);
  74 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  75 static const char *print_cstring(const char *, const u_char *);
  76 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  77                                                 const u_char *,
  78                                                 u_short, u_char, u_char);
  79 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  80                                                const u_char *);
  81 static const char *ataddr_string(u_short, u_char);
  82 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  83 static const char *ddpskt_string(int);
  84
  85 /*
  86  * Print AppleTalk Datagram Delivery Protocol packets.
  87  */
  88 void
  89 atalk_print(register const u_char *bp, u_int length)
  90 {
  91         register const struct LAP *lp;
  92         register const struct atDDP *dp;
  93         register const struct atShortDDP *sdp;
  94         u_short snet;
  95
  96         lp = (struct LAP *)bp;
  97         bp += sizeof(*lp);
  98         length -= sizeof(*lp);
  99         switch (lp->type) {
 100
 101         case lapShortDDP:
 102                 if (length < ddpSSize) {
 103                         (void)printf(" [|sddp %d]", length);
 104                         return;
 105                 }
 106                 sdp = (const struct atShortDDP *)bp;
 107                 printf("%s.%s",
 108                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 109                 printf(" > %s.%s:",
 110                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 111                 bp += ddpSSize;
 112                 length -= ddpSSize;
 113                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 114                 break;
 115
 116         case lapDDP:
 117                 if (length < ddpSize) {
 118                         (void)printf(" [|ddp %d]", length);
 119                         return;
 120                 }
 121                 dp = (const struct atDDP *)bp;
 122                 snet = EXTRACT_16BITS(&dp->srcNet);
 123                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 124                     ddpskt_string(dp->srcSkt));
 125                 printf(" > %s.%s:",
 126                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 127                     ddpskt_string(dp->dstSkt));
 128                 bp += ddpSize;
 129                 length -= ddpSize;
 130                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 131                 break;
 132
 133 #ifdef notdef
 134         case lapKLAP:
 135                 klap_print(bp, length);
 136                 break;
 137 #endif
 138
 139         default:
 140                 printf("%d > %d at-lap#%d %d",
 141                     lp->src, lp->dst, lp->type, length);
 142                 break;
 143         }
 144 }
 145
 146 /* XXX should probably pass in the snap header and do checks like arp_print() */
 147 void
 148 aarp_print(register const u_char *bp, u_int length)
 149 {
 150         register const struct aarp *ap;
 151
 152 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 153
 154         printf("aarp ");
 155         ap = (const struct aarp *)bp;
 156         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 157             ap->halen == 6 && ap->palen == 4 )
 158                 switch (ntohs(ap->op)) {
 159
 160                 case 1:                         /* request */
 161                         (void)printf("who-has %s tell %s",
 162                             AT(pdaddr), AT(psaddr));
 163                         return;
 164
 165                 case 2:                         /* response */
 166                         (void)printf("reply %s is-at %s",
 167                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 168                         return;
 169
 170                 case 3:                         /* probe (oy!) */
 171                         (void)printf("probe %s tell %s",
 172                             AT(pdaddr), AT(psaddr));
 173                         return;
 174                 }
 175         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 176             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 177             ap->halen, ap->palen);
 178 }
 179
 180 static void
 181 ddp_print(register const u_char *bp, register u_int length, register int t,
 182           register u_short snet, register u_char snode, u_char skt)
 183 {
 184
 185         switch (t) {
 186
 187         case ddpNBP:
 188                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 189                 break;
 190
 191         case ddpATP:
 192                 atp_print((const struct atATP *)bp, length);
 193                 break;
 194
 195         default:
 196                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 197                 break;
 198         }
 199 }
 200
 201 static void
 202 atp_print(register const struct atATP *ap, u_int length)
 203 {
 204         char c;
 205         u_int32_t data;
 206
 207         if ((const u_char *)(ap + 1) > snapend) {
 208                 /* Just bail if we don't have the whole chunk. */
 209                 fputs(tstr, stdout);
 210                 return;
 211         }
 212         length -= sizeof(*ap);
 213         switch (ap->control & 0xc0) {
 214
 215         case atpReqCode:
 216                 (void)printf(" atp-req%s %d",
 217                              ap->control & atpXO? " " : "*",
 218                              EXTRACT_16BITS(&ap->transID));
 219
 220                 atp_bitmap_print(ap->bitmap);
 221
 222                 if (length != 0)
 223                         (void)printf(" [len=%d]", length);
 224
 225                 switch (ap->control & (atpEOM|atpSTS)) {
 226                 case atpEOM:
 227                         (void)printf(" [EOM]");
 228                         break;
 229                 case atpSTS:
 230                         (void)printf(" [STS]");
 231                         break;
 232                 case atpEOM|atpSTS:
 233                         (void)printf(" [EOM,STS]");
 234                         break;
 235                 }
 236                 break;
 237
 238         case atpRspCode:
 239                 (void)printf(" atp-resp%s%d:%d (%d)",
 240                              ap->control & atpEOM? "*" : " ",
 241                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 242                 switch (ap->control & (atpXO|atpSTS)) {
 243                 case atpXO:
 244                         (void)printf(" [XO]");
 245                         break;
 246                 case atpSTS:
 247                         (void)printf(" [STS]");
 248                         break;
 249                 case atpXO|atpSTS:
 250                         (void)printf(" [XO,STS]");
 251                         break;
 252                 }
 253                 break;
 254
 255         case atpRelCode:
 256                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 257
 258                 atp_bitmap_print(ap->bitmap);
 259
 260                 /* length should be zero */
 261                 if (length)
 262                         (void)printf(" [len=%d]", length);
 263
 264                 /* there shouldn't be any control flags */
 265                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 266                         c = '[';
 267                         if (ap->control & atpXO) {
 268                                 (void)printf("%cXO", c);
 269                                 c = ',';
 270                         }
 271                         if (ap->control & atpEOM) {
 272                                 (void)printf("%cEOM", c);
 273                                 c = ',';
 274                         }
 275                         if (ap->control & atpSTS) {
 276                                 (void)printf("%cSTS", c);
 277                                 c = ',';
 278                         }
 279                         (void)printf("]");
 280                 }
 281                 break;
 282
 283         default:
 284                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 285                              EXTRACT_16BITS(&ap->transID), length);
 286                 break;
 287         }
 288         data = EXTRACT_32BITS(&ap->userData);
 289         if (data != 0)
 290                 (void)printf(" 0x%x", data);
 291 }
 292
 293 static void
 294 atp_bitmap_print(register u_char bm)
 295 {
 296         register char c;
 297         register int i;
 298
 299         /*
 300          * The '& 0xff' below is needed for compilers that want to sign
 301          * extend a u_char, which is the case with the Ultrix compiler.
 302          * (gcc is smart enough to eliminate it, at least on the Sparc).
 303          */
 304         if ((bm + 1) & (bm & 0xff)) {
 305                 c = '<';
 306                 for (i = 0; bm; ++i) {
 307                         if (bm & 1) {
 308                                 (void)printf("%c%d", c, i);
 309                                 c = ',';
 310                         }
 311                         bm >>= 1;
 312                 }
 313                 (void)printf(">");
 314         } else {
 315                 for (i = 0; bm; ++i)
 316                         bm >>= 1;
 317                 if (i > 1)
 318                         (void)printf("<0-%d>", i - 1);
 319                 else
 320                         (void)printf("<0>");
 321         }
 322 }
 323
 324 static void
 325 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 326           register u_char snode, register u_char skt)
 327 {
 328         register const struct atNBPtuple *tp =
 329                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 330         int i;
 331         const u_char *ep;
 332
 333         length -= nbpHeaderSize;
 334         if (length < 8) {
 335                 /* must be room for at least one tuple */
 336                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 337                 return;
 338         }
 339         /* ep points to end of available data */
 340         ep = snapend;
 341         if ((const u_char *)tp > ep) {
 342                 fputs(tstr, stdout);
 343                 return;
 344         }
 345         switch (i = np->control & 0xf0) {
 346
 347         case nbpBrRq:
 348         case nbpLkUp:
 349                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 350                              np->id);
 351                 if ((const u_char *)(tp + 1) > ep) {
 352                         fputs(tstr, stdout);
 353                         return;
 354                 }
 355                 (void)nbp_name_print(tp, ep);
 356                 /*
 357                  * look for anomalies: the spec says there can only
 358                  * be one tuple, the address must match the source
 359                  * address and the enumerator should be zero.
 360                  */
 361                 if ((np->control & 0xf) != 1)
 362                         (void)printf(" [ntup=%d]", np->control & 0xf);
 363                 if (tp->enumerator)
 364                         (void)printf(" [enum=%d]", tp->enumerator);
 365                 if (EXTRACT_16BITS(&tp->net) != snet ||
 366                     tp->node != snode || tp->skt != skt)
 367                         (void)printf(" [addr=%s.%d]",
 368                             ataddr_string(EXTRACT_16BITS(&tp->net),
 369                             tp->node), tp->skt);
 370                 break;
 371
 372         case nbpLkUpReply:
 373                 (void)printf(" nbp-reply %d:", np->id);
 374
 375                 /* print each of the tuples in the reply */
 376                 for (i = np->control & 0xf; --i >= 0 && tp; )
 377                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 378                 break;
 379
 380         default:
 381                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 382                                 length);
 383                 break;
 384         }
 385 }
 386
 387 /* print a counted string */
 388 static const char *
 389 print_cstring(register const char *cp, register const u_char *ep)
 390 {
 391         register u_int length;
 392
 393         if (cp >= (const char *)ep) {
 394                 fputs(tstr, stdout);
 395                 return (0);
 396         }
 397         length = *cp++;
 398
 399         /* Spec says string can be at most 32 bytes long */
 400         if (length > 32) {
 401                 (void)printf("[len=%u]", length);
 402                 return (0);
 403         }
 404         while ((int)--length >= 0) {
 405                 if (cp >= (char *)ep) {
 406                         fputs(tstr, stdout);
 407                         return (0);
 408                 }
 409                 putchar(*cp++);
 410         }
 411         return (cp);
 412 }
 413
 414 static const struct atNBPtuple *
 415 nbp_tuple_print(register const struct atNBPtuple *tp,
 416                 register const u_char *ep,
 417                 register u_short snet, register u_char snode,
 418                 register u_char skt)
 419 {
 420         register const struct atNBPtuple *tpn;
 421
 422         if ((const u_char *)(tp + 1) > ep) {
 423                 fputs(tstr, stdout);
 424                 return 0;
 425         }
 426         tpn = nbp_name_print(tp, ep);
 427
 428         /* if the enumerator isn't 1, print it */
 429         if (tp->enumerator != 1)
 430                 (void)printf("(%d)", tp->enumerator);
 431
 432         /* if the socket doesn't match the src socket, print it */
 433         if (tp->skt != skt)
 434                 (void)printf(" %d", tp->skt);
 435
 436         /* if the address doesn't match the src address, it's an anomaly */
 437         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 438                 (void)printf(" [addr=%s]",
 439                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 440
 441         return (tpn);
 442 }
 443
 444 static const struct atNBPtuple *
 445 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 446 {
 447         register const char *cp = (const char *)tp + nbpTupleSize;
 448
 449         putchar(' ');
 450
 451         /* Object */
 452         putchar('"');
 453         if ((cp = print_cstring(cp, ep)) != NULL) {
 454                 /* Type */
 455                 putchar(':');
 456                 if ((cp = print_cstring(cp, ep)) != NULL) {
 457                         /* Zone */
 458                         putchar('@');
 459                         if ((cp = print_cstring(cp, ep)) != NULL)
 460                                 putchar('"');
 461                 }
 462         }
 463         return ((const struct atNBPtuple *)cp);
 464 }
 465
 466
 467 #define HASHNAMESIZE 4096
 468
 469 struct hnamemem {
 470         int addr;
 471         char *name;
 472         struct hnamemem *nxt;
 473 };
 474
 475 static struct hnamemem hnametable[HASHNAMESIZE];
 476
 477 static const char *
 478 ataddr_string(u_short atnet, u_char athost)
 479 {
 480         register struct hnamemem *tp, *tp2;
 481         register int i = (atnet << 8) | athost;
 482         char nambuf[MAXHOSTNAMELEN + 20];
 483         static int first = 1;
 484         FILE *fp;
 485
 486         /*
 487          * if this is the first call, see if there's an AppleTalk
 488          * number to name map file.
 489          */
 490         if (first && (first = 0, !nflag)
 491             && (fp = fopen("/etc/atalk.names", "r"))) {
 492                 char line[256];
 493                 int i1, i2, i3;
 494
 495                 while (fgets(line, sizeof(line), fp)) {
 496                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 497                                 continue;
 498                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 499                                      nambuf) == 4)
 500                                 /* got a hostname. */
 501                                 i3 |= ((i1 << 8) | i2) << 8;
 502                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 503                                         nambuf) == 3)
 504                                 /* got a net name */
 505                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 506                         else
 507                                 continue;
 508
 509                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 510                              tp->nxt; tp = tp->nxt)
 511                                 ;
 512                         tp->addr = i3;
 513                         tp->nxt = newhnamemem();
 514                         tp->name = savestr(nambuf);
 515                 }
 516                 fclose(fp);
 517         }
 518
 519         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 520                 if (tp->addr == i)
 521                         return (tp->name);
 522
 523         /* didn't have the node name -- see if we've got the net name */
 524         i |= 255;
 525         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 526                 if (tp2->addr == i) {
 527                         tp->addr = (atnet << 8) | athost;
 528                         tp->nxt = newhnamemem();
 529                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 530                             tp2->name, athost);
 531                         tp->name = savestr(nambuf);
 532                         return (tp->name);
 533                 }
 534
 535         tp->addr = (atnet << 8) | athost;
 536         tp->nxt = newhnamemem();
 537         if (athost != 255)
 538                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 539                     atnet >> 8, atnet & 0xff, athost);
 540         else
 541                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 542                     atnet & 0xff);
 543         tp->name = savestr(nambuf);
 544
 545         return (tp->name);
 546 }
 547
 548 static struct tok skt2str[] = {
 549         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 550         { nbpSkt,       "nis" },        /* name info socket */
 551         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 552         { zipSkt,       "zip" },        /* zone info protocol */
 553         { 0,            NULL }
 554 };
 555
 556 static const char *
 557 ddpskt_string(register int skt)
 558 {
 559         static char buf[8];
 560
 561         if (nflag) {
 562                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 563                 return (buf);
 564         }
 565         return (tok2str(skt2str, "%d", skt));
 566 }