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 1.53 2000-03-13 05:01:04 itojun 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 #include <netinet/ip.h>
  46 #include <netinet/ip_var.h>
  47 #include <netinet/if_ether.h>
  48 #include <netinet/udp.h>
  49 #include <netinet/udp_var.h>
  50 #include <netinet/tcp.h>
  51
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <string.h>
  55
  56 #include "interface.h"
  57 #include "addrtoname.h"
  58 #include "ethertype.h"
  59 #include "extract.h"                    /* must come after interface.h */
  60 #include "appletalk.h"
  61 #include "savestr.h"
  62
  63 static struct tok type2str[] = {
  64         { ddpRTMP,              "rtmp" },
  65         { ddpRTMPrequest,       "rtmpReq" },
  66         { ddpECHO,              "echo" },
  67         { ddpIP,                "IP" },
  68         { ddpARP,               "ARP" },
  69         { ddpKLAP,              "KLAP" },
  70         { 0,                    NULL }
  71 };
  72
  73 struct aarp {
  74         u_short htype, ptype;
  75         u_char  halen, palen;
  76         u_short op;
  77         u_char  hsaddr[6];
  78         u_char  psaddr[4];
  79         u_char  hdaddr[6];
  80         u_char  pdaddr[4];
  81 };
  82
  83 static char tstr[] = "[|atalk]";
  84
  85 static void atp_print(const struct atATP *, u_int);
  86 static void atp_bitmap_print(u_char);
  87 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  88 static const char *print_cstring(const char *, const u_char *);
  89 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  90                                                 const u_char *,
  91                                                 u_short, u_char, u_char);
  92 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  93                                                const u_char *);
  94 static const char *ataddr_string(u_short, u_char);
  95 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  96 static const char *ddpskt_string(int);
  97
  98 /*
  99  * Print AppleTalk Datagram Delivery Protocol packets.
 100  */
 101 void
 102 atalk_print(register const u_char *bp, u_int length)
 103 {
 104         register const struct LAP *lp;
 105         register const struct atDDP *dp;
 106         register const struct atShortDDP *sdp;
 107         u_short snet;
 108
 109         lp = (struct LAP *)bp;
 110         bp += sizeof(*lp);
 111         length -= sizeof(*lp);
 112         switch (lp->type) {
 113
 114         case lapShortDDP:
 115                 if (length < ddpSSize) {
 116                         (void)printf(" [|sddp %d]", length);
 117                         return;
 118                 }
 119                 sdp = (const struct atShortDDP *)bp;
 120                 printf("%s.%s",
 121                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 122                 printf(" > %s.%s:",
 123                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 124                 bp += ddpSSize;
 125                 length -= ddpSSize;
 126                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 127                 break;
 128
 129         case lapDDP:
 130                 if (length < ddpSize) {
 131                         (void)printf(" [|ddp %d]", length);
 132                         return;
 133                 }
 134                 dp = (const struct atDDP *)bp;
 135                 snet = EXTRACT_16BITS(&dp->srcNet);
 136                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 137                     ddpskt_string(dp->srcSkt));
 138                 printf(" > %s.%s:",
 139                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 140                     ddpskt_string(dp->dstSkt));
 141                 bp += ddpSize;
 142                 length -= ddpSize;
 143                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 144                 break;
 145
 146 #ifdef notdef
 147         case lapKLAP:
 148                 klap_print(bp, length);
 149                 break;
 150 #endif
 151
 152         default:
 153                 printf("%d > %d at-lap#%d %d",
 154                     lp->src, lp->dst, lp->type, length);
 155                 break;
 156         }
 157 }
 158
 159 /* XXX should probably pass in the snap header and do checks like arp_print() */
 160 void
 161 aarp_print(register const u_char *bp, u_int length)
 162 {
 163         register const struct aarp *ap;
 164
 165 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 166
 167         printf("aarp ");
 168         ap = (const struct aarp *)bp;
 169         if (ap->htype == 1 && ap->ptype == ETHERTYPE_ATALK &&
 170             ap->halen == 6 && ap->palen == 4 )
 171                 switch (ap->op) {
 172
 173                 case 1:                         /* request */
 174                         (void)printf("who-has %s tell %s",
 175                             AT(pdaddr), AT(psaddr));
 176                         return;
 177
 178                 case 2:                         /* response */
 179                         (void)printf("reply %s is-at %s",
 180                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 181                         return;
 182
 183                 case 3:                         /* probe (oy!) */
 184                         (void)printf("probe %s tell %s",
 185                             AT(pdaddr), AT(psaddr));
 186                         return;
 187                 }
 188         (void)printf("len %d op %d htype %d ptype %#x halen %d palen %d",
 189             length, ap->op, ap->htype, ap->ptype, ap->halen, ap->palen );
 190 }
 191
 192 static void
 193 ddp_print(register const u_char *bp, register u_int length, register int t,
 194           register u_short snet, register u_char snode, u_char skt)
 195 {
 196
 197         switch (t) {
 198
 199         case ddpNBP:
 200                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 201                 break;
 202
 203         case ddpATP:
 204                 atp_print((const struct atATP *)bp, length);
 205                 break;
 206
 207         default:
 208                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 209                 break;
 210         }
 211 }
 212
 213 static void
 214 atp_print(register const struct atATP *ap, u_int length)
 215 {
 216         char c;
 217         u_int32_t data;
 218
 219         if ((const u_char *)(ap + 1) > snapend) {
 220                 /* Just bail if we don't have the whole chunk. */
 221                 fputs(tstr, stdout);
 222                 return;
 223         }
 224         length -= sizeof(*ap);
 225         switch (ap->control & 0xc0) {
 226
 227         case atpReqCode:
 228                 (void)printf(" atp-req%s %d",
 229                              ap->control & atpXO? " " : "*",
 230                              EXTRACT_16BITS(&ap->transID));
 231
 232                 atp_bitmap_print(ap->bitmap);
 233
 234                 if (length != 0)
 235                         (void)printf(" [len=%d]", length);
 236
 237                 switch (ap->control & (atpEOM|atpSTS)) {
 238                 case atpEOM:
 239                         (void)printf(" [EOM]");
 240                         break;
 241                 case atpSTS:
 242                         (void)printf(" [STS]");
 243                         break;
 244                 case atpEOM|atpSTS:
 245                         (void)printf(" [EOM,STS]");
 246                         break;
 247                 }
 248                 break;
 249
 250         case atpRspCode:
 251                 (void)printf(" atp-resp%s%d:%d (%d)",
 252                              ap->control & atpEOM? "*" : " ",
 253                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 254                 switch (ap->control & (atpXO|atpSTS)) {
 255                 case atpXO:
 256                         (void)printf(" [XO]");
 257                         break;
 258                 case atpSTS:
 259                         (void)printf(" [STS]");
 260                         break;
 261                 case atpXO|atpSTS:
 262                         (void)printf(" [XO,STS]");
 263                         break;
 264                 }
 265                 break;
 266
 267         case atpRelCode:
 268                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 269
 270                 atp_bitmap_print(ap->bitmap);
 271
 272                 /* length should be zero */
 273                 if (length)
 274                         (void)printf(" [len=%d]", length);
 275
 276                 /* there shouldn't be any control flags */
 277                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 278                         c = '[';
 279                         if (ap->control & atpXO) {
 280                                 (void)printf("%cXO", c);
 281                                 c = ',';
 282                         }
 283                         if (ap->control & atpEOM) {
 284                                 (void)printf("%cEOM", c);
 285                                 c = ',';
 286                         }
 287                         if (ap->control & atpSTS) {
 288                                 (void)printf("%cSTS", c);
 289                                 c = ',';
 290                         }
 291                         (void)printf("]");
 292                 }
 293                 break;
 294
 295         default:
 296                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 297                              EXTRACT_16BITS(&ap->transID), length);
 298                 break;
 299         }
 300         data = EXTRACT_32BITS(&ap->userData);
 301         if (data != 0)
 302                 (void)printf(" 0x%x", data);
 303 }
 304
 305 static void
 306 atp_bitmap_print(register u_char bm)
 307 {
 308         register char c;
 309         register int i;
 310
 311         /*
 312          * The '& 0xff' below is needed for compilers that want to sign
 313          * extend a u_char, which is the case with the Ultrix compiler.
 314          * (gcc is smart enough to eliminate it, at least on the Sparc).
 315          */
 316         if ((bm + 1) & (bm & 0xff)) {
 317                 c = '<';
 318                 for (i = 0; bm; ++i) {
 319                         if (bm & 1) {
 320                                 (void)printf("%c%d", c, i);
 321                                 c = ',';
 322                         }
 323                         bm >>= 1;
 324                 }
 325                 (void)printf(">");
 326         } else {
 327                 for (i = 0; bm; ++i)
 328                         bm >>= 1;
 329                 if (i > 1)
 330                         (void)printf("<0-%d>", i - 1);
 331                 else
 332                         (void)printf("<0>");
 333         }
 334 }
 335
 336 static void
 337 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 338           register u_char snode, register u_char skt)
 339 {
 340         register const struct atNBPtuple *tp =
 341                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 342         int i;
 343         const u_char *ep;
 344
 345         length -= nbpHeaderSize;
 346         if (length < 8) {
 347                 /* must be room for at least one tuple */
 348                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 349                 return;
 350         }
 351         /* ep points to end of available data */
 352         ep = snapend;
 353         if ((const u_char *)tp > ep) {
 354                 fputs(tstr, stdout);
 355                 return;
 356         }
 357         switch (i = np->control & 0xf0) {
 358
 359         case nbpBrRq:
 360         case nbpLkUp:
 361                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 362                              np->id);
 363                 if ((const u_char *)(tp + 1) > ep) {
 364                         fputs(tstr, stdout);
 365                         return;
 366                 }
 367                 (void)nbp_name_print(tp, ep);
 368                 /*
 369                  * look for anomalies: the spec says there can only
 370                  * be one tuple, the address must match the source
 371                  * address and the enumerator should be zero.
 372                  */
 373                 if ((np->control & 0xf) != 1)
 374                         (void)printf(" [ntup=%d]", np->control & 0xf);
 375                 if (tp->enumerator)
 376                         (void)printf(" [enum=%d]", tp->enumerator);
 377                 if (EXTRACT_16BITS(&tp->net) != snet ||
 378                     tp->node != snode || tp->skt != skt)
 379                         (void)printf(" [addr=%s.%d]",
 380                             ataddr_string(EXTRACT_16BITS(&tp->net),
 381                             tp->node), tp->skt);
 382                 break;
 383
 384         case nbpLkUpReply:
 385                 (void)printf(" nbp-reply %d:", np->id);
 386
 387                 /* print each of the tuples in the reply */
 388                 for (i = np->control & 0xf; --i >= 0 && tp; )
 389                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 390                 break;
 391
 392         default:
 393                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 394                                 length);
 395                 break;
 396         }
 397 }
 398
 399 /* print a counted string */
 400 static const char *
 401 print_cstring(register const char *cp, register const u_char *ep)
 402 {
 403         register u_int length;
 404
 405         if (cp >= (const char *)ep) {
 406                 fputs(tstr, stdout);
 407                 return (0);
 408         }
 409         length = *cp++;
 410
 411         /* Spec says string can be at most 32 bytes long */
 412         if (length > 32) {
 413                 (void)printf("[len=%u]", length);
 414                 return (0);
 415         }
 416         while ((int)--length >= 0) {
 417                 if (cp >= (char *)ep) {
 418                         fputs(tstr, stdout);
 419                         return (0);
 420                 }
 421                 putchar(*cp++);
 422         }
 423         return (cp);
 424 }
 425
 426 static const struct atNBPtuple *
 427 nbp_tuple_print(register const struct atNBPtuple *tp,
 428                 register const u_char *ep,
 429                 register u_short snet, register u_char snode,
 430                 register u_char skt)
 431 {
 432         register const struct atNBPtuple *tpn;
 433
 434         if ((const u_char *)(tp + 1) > ep) {
 435                 fputs(tstr, stdout);
 436                 return 0;
 437         }
 438         tpn = nbp_name_print(tp, ep);
 439
 440         /* if the enumerator isn't 1, print it */
 441         if (tp->enumerator != 1)
 442                 (void)printf("(%d)", tp->enumerator);
 443
 444         /* if the socket doesn't match the src socket, print it */
 445         if (tp->skt != skt)
 446                 (void)printf(" %d", tp->skt);
 447
 448         /* if the address doesn't match the src address, it's an anomaly */
 449         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 450                 (void)printf(" [addr=%s]",
 451                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 452
 453         return (tpn);
 454 }
 455
 456 static const struct atNBPtuple *
 457 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 458 {
 459         register const char *cp = (const char *)tp + nbpTupleSize;
 460
 461         putchar(' ');
 462
 463         /* Object */
 464         putchar('"');
 465         if ((cp = print_cstring(cp, ep)) != NULL) {
 466                 /* Type */
 467                 putchar(':');
 468                 if ((cp = print_cstring(cp, ep)) != NULL) {
 469                         /* Zone */
 470                         putchar('@');
 471                         if ((cp = print_cstring(cp, ep)) != NULL)
 472                                 putchar('"');
 473                 }
 474         }
 475         return ((const struct atNBPtuple *)cp);
 476 }
 477
 478
 479 #define HASHNAMESIZE 4096
 480
 481 struct hnamemem {
 482         int addr;
 483         char *name;
 484         struct hnamemem *nxt;
 485 };
 486
 487 static struct hnamemem hnametable[HASHNAMESIZE];
 488
 489 static const char *
 490 ataddr_string(u_short atnet, u_char athost)
 491 {
 492         register struct hnamemem *tp, *tp2;
 493         register int i = (atnet << 8) | athost;
 494         char nambuf[256];
 495         static int first = 1;
 496         FILE *fp;
 497
 498         /*
 499          * if this is the first call, see if there's an AppleTalk
 500          * number to name map file.
 501          */
 502         if (first && (first = 0, !nflag)
 503             && (fp = fopen("/etc/atalk.names", "r"))) {
 504                 char line[256];
 505                 int i1, i2, i3;
 506
 507                 while (fgets(line, sizeof(line), fp)) {
 508                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 509                                 continue;
 510                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 511                                      nambuf) == 4)
 512                                 /* got a hostname. */
 513                                 i3 |= ((i1 << 8) | i2) << 8;
 514                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 515                                         nambuf) == 3)
 516                                 /* got a net name */
 517                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 518                         else
 519                                 continue;
 520
 521                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 522                              tp->nxt; tp = tp->nxt)
 523                                 ;
 524                         tp->addr = i3;
 525                         tp->nxt = newhnamemem();
 526                         tp->name = savestr(nambuf);
 527                 }
 528                 fclose(fp);
 529         }
 530
 531         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 532                 if (tp->addr == i)
 533                         return (tp->name);
 534
 535         /* didn't have the node name -- see if we've got the net name */
 536         i |= 255;
 537         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 538                 if (tp2->addr == i) {
 539                         tp->addr = (atnet << 8) | athost;
 540                         tp->nxt = newhnamemem();
 541                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 542                             tp2->name, athost);
 543                         tp->name = savestr(nambuf);
 544                         return (tp->name);
 545                 }
 546
 547         tp->addr = (atnet << 8) | athost;
 548         tp->nxt = newhnamemem();
 549         if (athost != 255)
 550                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 551                     atnet >> 8, atnet & 0xff, athost);
 552         else
 553                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 554                     atnet & 0xff);
 555         tp->name = savestr(nambuf);
 556
 557         return (tp->name);
 558 }
 559
 560 static struct tok skt2str[] = {
 561         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 562         { nbpSkt,       "nis" },        /* name info socket */
 563         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 564         { zipSkt,       "zip" },        /* zone info protocol */
 565         { 0,            NULL }
 566 };
 567
 568 static const char *
 569 ddpskt_string(register int skt)
 570 {
 571         static char buf[8];
 572
 573         if (nflag) {
 574                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 575                 return (buf);
 576         }
 577         return (tok2str(skt2str, "%d", skt));
 578 }