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 1.54 2000-04-02 23:50:48 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_int16_t       htype, ptype;
  75         u_int8_t        halen, palen;
  76         u_int16_t       op;
  77         u_int8_t        hsaddr[6];
  78         u_int8_t        psaddr[4];
  79         u_int8_t        hdaddr[6];
  80         u_int8_t        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 (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 170             ap->halen == 6 && ap->palen == 4 )
 171                 switch (ntohs(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 %u op %u htype %u ptype %#x halen %u palen %u",
 189             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 190             ap->halen, ap->palen);
 191 }
 192
 193 static void
 194 ddp_print(register const u_char *bp, register u_int length, register int t,
 195           register u_short snet, register u_char snode, u_char skt)
 196 {
 197
 198         switch (t) {
 199
 200         case ddpNBP:
 201                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 202                 break;
 203
 204         case ddpATP:
 205                 atp_print((const struct atATP *)bp, length);
 206                 break;
 207
 208         default:
 209                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 210                 break;
 211         }
 212 }
 213
 214 static void
 215 atp_print(register const struct atATP *ap, u_int length)
 216 {
 217         char c;
 218         u_int32_t data;
 219
 220         if ((const u_char *)(ap + 1) > snapend) {
 221                 /* Just bail if we don't have the whole chunk. */
 222                 fputs(tstr, stdout);
 223                 return;
 224         }
 225         length -= sizeof(*ap);
 226         switch (ap->control & 0xc0) {
 227
 228         case atpReqCode:
 229                 (void)printf(" atp-req%s %d",
 230                              ap->control & atpXO? " " : "*",
 231                              EXTRACT_16BITS(&ap->transID));
 232
 233                 atp_bitmap_print(ap->bitmap);
 234
 235                 if (length != 0)
 236                         (void)printf(" [len=%d]", length);
 237
 238                 switch (ap->control & (atpEOM|atpSTS)) {
 239                 case atpEOM:
 240                         (void)printf(" [EOM]");
 241                         break;
 242                 case atpSTS:
 243                         (void)printf(" [STS]");
 244                         break;
 245                 case atpEOM|atpSTS:
 246                         (void)printf(" [EOM,STS]");
 247                         break;
 248                 }
 249                 break;
 250
 251         case atpRspCode:
 252                 (void)printf(" atp-resp%s%d:%d (%d)",
 253                              ap->control & atpEOM? "*" : " ",
 254                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 255                 switch (ap->control & (atpXO|atpSTS)) {
 256                 case atpXO:
 257                         (void)printf(" [XO]");
 258                         break;
 259                 case atpSTS:
 260                         (void)printf(" [STS]");
 261                         break;
 262                 case atpXO|atpSTS:
 263                         (void)printf(" [XO,STS]");
 264                         break;
 265                 }
 266                 break;
 267
 268         case atpRelCode:
 269                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 270
 271                 atp_bitmap_print(ap->bitmap);
 272
 273                 /* length should be zero */
 274                 if (length)
 275                         (void)printf(" [len=%d]", length);
 276
 277                 /* there shouldn't be any control flags */
 278                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 279                         c = '[';
 280                         if (ap->control & atpXO) {
 281                                 (void)printf("%cXO", c);
 282                                 c = ',';
 283                         }
 284                         if (ap->control & atpEOM) {
 285                                 (void)printf("%cEOM", c);
 286                                 c = ',';
 287                         }
 288                         if (ap->control & atpSTS) {
 289                                 (void)printf("%cSTS", c);
 290                                 c = ',';
 291                         }
 292                         (void)printf("]");
 293                 }
 294                 break;
 295
 296         default:
 297                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 298                              EXTRACT_16BITS(&ap->transID), length);
 299                 break;
 300         }
 301         data = EXTRACT_32BITS(&ap->userData);
 302         if (data != 0)
 303                 (void)printf(" 0x%x", data);
 304 }
 305
 306 static void
 307 atp_bitmap_print(register u_char bm)
 308 {
 309         register char c;
 310         register int i;
 311
 312         /*
 313          * The '& 0xff' below is needed for compilers that want to sign
 314          * extend a u_char, which is the case with the Ultrix compiler.
 315          * (gcc is smart enough to eliminate it, at least on the Sparc).
 316          */
 317         if ((bm + 1) & (bm & 0xff)) {
 318                 c = '<';
 319                 for (i = 0; bm; ++i) {
 320                         if (bm & 1) {
 321                                 (void)printf("%c%d", c, i);
 322                                 c = ',';
 323                         }
 324                         bm >>= 1;
 325                 }
 326                 (void)printf(">");
 327         } else {
 328                 for (i = 0; bm; ++i)
 329                         bm >>= 1;
 330                 if (i > 1)
 331                         (void)printf("<0-%d>", i - 1);
 332                 else
 333                         (void)printf("<0>");
 334         }
 335 }
 336
 337 static void
 338 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 339           register u_char snode, register u_char skt)
 340 {
 341         register const struct atNBPtuple *tp =
 342                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 343         int i;
 344         const u_char *ep;
 345
 346         length -= nbpHeaderSize;
 347         if (length < 8) {
 348                 /* must be room for at least one tuple */
 349                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 350                 return;
 351         }
 352         /* ep points to end of available data */
 353         ep = snapend;
 354         if ((const u_char *)tp > ep) {
 355                 fputs(tstr, stdout);
 356                 return;
 357         }
 358         switch (i = np->control & 0xf0) {
 359
 360         case nbpBrRq:
 361         case nbpLkUp:
 362                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 363                              np->id);
 364                 if ((const u_char *)(tp + 1) > ep) {
 365                         fputs(tstr, stdout);
 366                         return;
 367                 }
 368                 (void)nbp_name_print(tp, ep);
 369                 /*
 370                  * look for anomalies: the spec says there can only
 371                  * be one tuple, the address must match the source
 372                  * address and the enumerator should be zero.
 373                  */
 374                 if ((np->control & 0xf) != 1)
 375                         (void)printf(" [ntup=%d]", np->control & 0xf);
 376                 if (tp->enumerator)
 377                         (void)printf(" [enum=%d]", tp->enumerator);
 378                 if (EXTRACT_16BITS(&tp->net) != snet ||
 379                     tp->node != snode || tp->skt != skt)
 380                         (void)printf(" [addr=%s.%d]",
 381                             ataddr_string(EXTRACT_16BITS(&tp->net),
 382                             tp->node), tp->skt);
 383                 break;
 384
 385         case nbpLkUpReply:
 386                 (void)printf(" nbp-reply %d:", np->id);
 387
 388                 /* print each of the tuples in the reply */
 389                 for (i = np->control & 0xf; --i >= 0 && tp; )
 390                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 391                 break;
 392
 393         default:
 394                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 395                                 length);
 396                 break;
 397         }
 398 }
 399
 400 /* print a counted string */
 401 static const char *
 402 print_cstring(register const char *cp, register const u_char *ep)
 403 {
 404         register u_int length;
 405
 406         if (cp >= (const char *)ep) {
 407                 fputs(tstr, stdout);
 408                 return (0);
 409         }
 410         length = *cp++;
 411
 412         /* Spec says string can be at most 32 bytes long */
 413         if (length > 32) {
 414                 (void)printf("[len=%u]", length);
 415                 return (0);
 416         }
 417         while ((int)--length >= 0) {
 418                 if (cp >= (char *)ep) {
 419                         fputs(tstr, stdout);
 420                         return (0);
 421                 }
 422                 putchar(*cp++);
 423         }
 424         return (cp);
 425 }
 426
 427 static const struct atNBPtuple *
 428 nbp_tuple_print(register const struct atNBPtuple *tp,
 429                 register const u_char *ep,
 430                 register u_short snet, register u_char snode,
 431                 register u_char skt)
 432 {
 433         register const struct atNBPtuple *tpn;
 434
 435         if ((const u_char *)(tp + 1) > ep) {
 436                 fputs(tstr, stdout);
 437                 return 0;
 438         }
 439         tpn = nbp_name_print(tp, ep);
 440
 441         /* if the enumerator isn't 1, print it */
 442         if (tp->enumerator != 1)
 443                 (void)printf("(%d)", tp->enumerator);
 444
 445         /* if the socket doesn't match the src socket, print it */
 446         if (tp->skt != skt)
 447                 (void)printf(" %d", tp->skt);
 448
 449         /* if the address doesn't match the src address, it's an anomaly */
 450         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 451                 (void)printf(" [addr=%s]",
 452                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 453
 454         return (tpn);
 455 }
 456
 457 static const struct atNBPtuple *
 458 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 459 {
 460         register const char *cp = (const char *)tp + nbpTupleSize;
 461
 462         putchar(' ');
 463
 464         /* Object */
 465         putchar('"');
 466         if ((cp = print_cstring(cp, ep)) != NULL) {
 467                 /* Type */
 468                 putchar(':');
 469                 if ((cp = print_cstring(cp, ep)) != NULL) {
 470                         /* Zone */
 471                         putchar('@');
 472                         if ((cp = print_cstring(cp, ep)) != NULL)
 473                                 putchar('"');
 474                 }
 475         }
 476         return ((const struct atNBPtuple *)cp);
 477 }
 478
 479
 480 #define HASHNAMESIZE 4096
 481
 482 struct hnamemem {
 483         int addr;
 484         char *name;
 485         struct hnamemem *nxt;
 486 };
 487
 488 static struct hnamemem hnametable[HASHNAMESIZE];
 489
 490 static const char *
 491 ataddr_string(u_short atnet, u_char athost)
 492 {
 493         register struct hnamemem *tp, *tp2;
 494         register int i = (atnet << 8) | athost;
 495         char nambuf[256];
 496         static int first = 1;
 497         FILE *fp;
 498
 499         /*
 500          * if this is the first call, see if there's an AppleTalk
 501          * number to name map file.
 502          */
 503         if (first && (first = 0, !nflag)
 504             && (fp = fopen("/etc/atalk.names", "r"))) {
 505                 char line[256];
 506                 int i1, i2, i3;
 507
 508                 while (fgets(line, sizeof(line), fp)) {
 509                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 510                                 continue;
 511                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 512                                      nambuf) == 4)
 513                                 /* got a hostname. */
 514                                 i3 |= ((i1 << 8) | i2) << 8;
 515                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 516                                         nambuf) == 3)
 517                                 /* got a net name */
 518                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 519                         else
 520                                 continue;
 521
 522                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 523                              tp->nxt; tp = tp->nxt)
 524                                 ;
 525                         tp->addr = i3;
 526                         tp->nxt = newhnamemem();
 527                         tp->name = savestr(nambuf);
 528                 }
 529                 fclose(fp);
 530         }
 531
 532         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 533                 if (tp->addr == i)
 534                         return (tp->name);
 535
 536         /* didn't have the node name -- see if we've got the net name */
 537         i |= 255;
 538         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 539                 if (tp2->addr == i) {
 540                         tp->addr = (atnet << 8) | athost;
 541                         tp->nxt = newhnamemem();
 542                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 543                             tp2->name, athost);
 544                         tp->name = savestr(nambuf);
 545                         return (tp->name);
 546                 }
 547
 548         tp->addr = (atnet << 8) | athost;
 549         tp->nxt = newhnamemem();
 550         if (athost != 255)
 551                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 552                     atnet >> 8, atnet & 0xff, athost);
 553         else
 554                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 555                     atnet & 0xff);
 556         tp->name = savestr(nambuf);
 557
 558         return (tp->name);
 559 }
 560
 561 static struct tok skt2str[] = {
 562         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 563         { nbpSkt,       "nis" },        /* name info socket */
 564         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 565         { zipSkt,       "zip" },        /* zone info protocol */
 566         { 0,            NULL }
 567 };
 568
 569 static const char *
 570 ddpskt_string(register int skt)
 571 {
 572         static char buf[8];
 573
 574         if (nflag) {
 575                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 576                 return (buf);
 577         }
 578         return (tok2str(skt2str, "%d", skt));
 579 }