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 1.67 2001-07-05 18:54:14 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 #include <netdb.h>              /* for MAXHOSTNAMELEN on some platforms */
  43 #include <pcap.h>
  44
  45 #include "interface.h"
  46 #include "addrtoname.h"
  47 #include "ethertype.h"
  48 #include "extract.h"                    /* must come after interface.h */
  49 #include "appletalk.h"
  50
  51 static struct tok type2str[] = {
  52         { ddpRTMP,              "rtmp" },
  53         { ddpRTMPrequest,       "rtmpReq" },
  54         { ddpECHO,              "echo" },
  55         { ddpIP,                "IP" },
  56         { ddpARP,               "ARP" },
  57         { ddpKLAP,              "KLAP" },
  58         { 0,                    NULL }
  59 };
  60
  61 struct aarp {
  62         u_int16_t       htype, ptype;
  63         u_int8_t        halen, palen;
  64         u_int16_t       op;
  65         u_int8_t        hsaddr[6];
  66         u_int8_t        psaddr[4];
  67         u_int8_t        hdaddr[6];
  68         u_int8_t        pdaddr[4];
  69 };
  70
  71 static char tstr[] = "[|atalk]";
  72
  73 static void atp_print(const struct atATP *, u_int);
  74 static void atp_bitmap_print(u_char);
  75 static void nbp_print(const struct atNBP *, u_int, u_short, u_char, u_char);
  76 static const char *print_cstring(const char *, const u_char *);
  77 static const struct atNBPtuple *nbp_tuple_print(const struct atNBPtuple *,
  78                                                 const u_char *,
  79                                                 u_short, u_char, u_char);
  80 static const struct atNBPtuple *nbp_name_print(const struct atNBPtuple *,
  81                                                const u_char *);
  82 static const char *ataddr_string(u_short, u_char);
  83 static void ddp_print(const u_char *, u_int, int, u_short, u_char, u_char);
  84 static const char *ddpskt_string(int);
  85
  86 /*
  87  * Print LLAP packets received on a physical LocalTalk interface.
  88  */
  89 void
  90 ltalk_if_print(u_char *user, const struct pcap_pkthdr *h, const u_char *p)
  91 {
  92         snapend = p + h->caplen;
  93         ++infodelay;
  94         ts_print(&h->ts);
  95         llap_print(p, h->caplen);
  96         if(xflag)
  97                 default_print(p, h->caplen);
  98         putchar('\n');
  99         --infodelay;
 100         if (infoprint)
 101                 info(0);
 102 }
 103
 104 /*
 105  * Print AppleTalk LLAP packets.
 106  */
 107 void
 108 llap_print(register const u_char *bp, u_int length)
 109 {
 110         register const struct LAP *lp;
 111         register const struct atDDP *dp;
 112         register const struct atShortDDP *sdp;
 113         u_short snet;
 114
 115         lp = (struct LAP *)bp;
 116         bp += sizeof(*lp);
 117         length -= sizeof(*lp);
 118         switch (lp->type) {
 119
 120         case lapShortDDP:
 121                 if (length < ddpSSize) {
 122                         (void)printf(" [|sddp %d]", length);
 123                         return;
 124                 }
 125                 sdp = (const struct atShortDDP *)bp;
 126                 printf("%s.%s",
 127                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 128                 printf(" > %s.%s:",
 129                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 130                 bp += ddpSSize;
 131                 length -= ddpSSize;
 132                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 133                 break;
 134
 135         case lapDDP:
 136                 if (length < ddpSize) {
 137                         (void)printf(" [|ddp %d]", length);
 138                         return;
 139                 }
 140                 dp = (const struct atDDP *)bp;
 141                 snet = EXTRACT_16BITS(&dp->srcNet);
 142                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 143                     ddpskt_string(dp->srcSkt));
 144                 printf(" > %s.%s:",
 145                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 146                     ddpskt_string(dp->dstSkt));
 147                 bp += ddpSize;
 148                 length -= ddpSize;
 149                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 150                 break;
 151
 152 #ifdef notdef
 153         case lapKLAP:
 154                 klap_print(bp, length);
 155                 break;
 156 #endif
 157
 158         default:
 159                 printf("%d > %d at-lap#%d %d",
 160                     lp->src, lp->dst, lp->type, length);
 161                 break;
 162         }
 163 }
 164
 165 /*
 166  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 167  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 168  * packets in them).
 169  */
 170 void
 171 atalk_print(register const u_char *bp, u_int length)
 172 {
 173         register const struct atDDP *dp;
 174         u_short snet;
 175
 176         if (length < ddpSize) {
 177           (void)printf(" [|ddp %d]", length);
 178           return;
 179         }
 180         dp = (const struct atDDP *)bp;
 181         snet = EXTRACT_16BITS(&dp->srcNet);
 182         printf("%s.%s", ataddr_string(snet, dp->srcNode),
 183                ddpskt_string(dp->srcSkt));
 184         printf(" > %s.%s:",
 185                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 186                ddpskt_string(dp->dstSkt));
 187         bp += ddpSize;
 188         length -= ddpSize;
 189         ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 190 }
 191
 192 /* XXX should probably pass in the snap header and do checks like arp_print() */
 193 void
 194 aarp_print(register const u_char *bp, u_int length)
 195 {
 196         register const struct aarp *ap;
 197
 198 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 199
 200         printf("aarp ");
 201         ap = (const struct aarp *)bp;
 202         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 203             ap->halen == 6 && ap->palen == 4 )
 204                 switch (ntohs(ap->op)) {
 205
 206                 case 1:                         /* request */
 207                         (void)printf("who-has %s tell %s",
 208                             AT(pdaddr), AT(psaddr));
 209                         return;
 210
 211                 case 2:                         /* response */
 212                         (void)printf("reply %s is-at %s",
 213                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 214                         return;
 215
 216                 case 3:                         /* probe (oy!) */
 217                         (void)printf("probe %s tell %s",
 218                             AT(pdaddr), AT(psaddr));
 219                         return;
 220                 }
 221         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 222             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 223             ap->halen, ap->palen);
 224 }
 225
 226 /*
 227  * Print AppleTalk Datagram Delivery Protocol packets.
 228  */
 229 static void
 230 ddp_print(register const u_char *bp, register u_int length, register int t,
 231           register u_short snet, register u_char snode, u_char skt)
 232 {
 233
 234         switch (t) {
 235
 236         case ddpNBP:
 237                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 238                 break;
 239
 240         case ddpATP:
 241                 atp_print((const struct atATP *)bp, length);
 242                 break;
 243
 244         default:
 245                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 246                 break;
 247         }
 248 }
 249
 250 static void
 251 atp_print(register const struct atATP *ap, u_int length)
 252 {
 253         char c;
 254         u_int32_t data;
 255
 256         if ((const u_char *)(ap + 1) > snapend) {
 257                 /* Just bail if we don't have the whole chunk. */
 258                 fputs(tstr, stdout);
 259                 return;
 260         }
 261         length -= sizeof(*ap);
 262         switch (ap->control & 0xc0) {
 263
 264         case atpReqCode:
 265                 (void)printf(" atp-req%s %d",
 266                              ap->control & atpXO? " " : "*",
 267                              EXTRACT_16BITS(&ap->transID));
 268
 269                 atp_bitmap_print(ap->bitmap);
 270
 271                 if (length != 0)
 272                         (void)printf(" [len=%d]", length);
 273
 274                 switch (ap->control & (atpEOM|atpSTS)) {
 275                 case atpEOM:
 276                         (void)printf(" [EOM]");
 277                         break;
 278                 case atpSTS:
 279                         (void)printf(" [STS]");
 280                         break;
 281                 case atpEOM|atpSTS:
 282                         (void)printf(" [EOM,STS]");
 283                         break;
 284                 }
 285                 break;
 286
 287         case atpRspCode:
 288                 (void)printf(" atp-resp%s%d:%d (%d)",
 289                              ap->control & atpEOM? "*" : " ",
 290                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 291                 switch (ap->control & (atpXO|atpSTS)) {
 292                 case atpXO:
 293                         (void)printf(" [XO]");
 294                         break;
 295                 case atpSTS:
 296                         (void)printf(" [STS]");
 297                         break;
 298                 case atpXO|atpSTS:
 299                         (void)printf(" [XO,STS]");
 300                         break;
 301                 }
 302                 break;
 303
 304         case atpRelCode:
 305                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 306
 307                 atp_bitmap_print(ap->bitmap);
 308
 309                 /* length should be zero */
 310                 if (length)
 311                         (void)printf(" [len=%d]", length);
 312
 313                 /* there shouldn't be any control flags */
 314                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 315                         c = '[';
 316                         if (ap->control & atpXO) {
 317                                 (void)printf("%cXO", c);
 318                                 c = ',';
 319                         }
 320                         if (ap->control & atpEOM) {
 321                                 (void)printf("%cEOM", c);
 322                                 c = ',';
 323                         }
 324                         if (ap->control & atpSTS) {
 325                                 (void)printf("%cSTS", c);
 326                                 c = ',';
 327                         }
 328                         (void)printf("]");
 329                 }
 330                 break;
 331
 332         default:
 333                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 334                              EXTRACT_16BITS(&ap->transID), length);
 335                 break;
 336         }
 337         data = EXTRACT_32BITS(&ap->userData);
 338         if (data != 0)
 339                 (void)printf(" 0x%x", data);
 340 }
 341
 342 static void
 343 atp_bitmap_print(register u_char bm)
 344 {
 345         register char c;
 346         register int i;
 347
 348         /*
 349          * The '& 0xff' below is needed for compilers that want to sign
 350          * extend a u_char, which is the case with the Ultrix compiler.
 351          * (gcc is smart enough to eliminate it, at least on the Sparc).
 352          */
 353         if ((bm + 1) & (bm & 0xff)) {
 354                 c = '<';
 355                 for (i = 0; bm; ++i) {
 356                         if (bm & 1) {
 357                                 (void)printf("%c%d", c, i);
 358                                 c = ',';
 359                         }
 360                         bm >>= 1;
 361                 }
 362                 (void)printf(">");
 363         } else {
 364                 for (i = 0; bm; ++i)
 365                         bm >>= 1;
 366                 if (i > 1)
 367                         (void)printf("<0-%d>", i - 1);
 368                 else
 369                         (void)printf("<0>");
 370         }
 371 }
 372
 373 static void
 374 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 375           register u_char snode, register u_char skt)
 376 {
 377         register const struct atNBPtuple *tp =
 378                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 379         int i;
 380         const u_char *ep;
 381
 382         length -= nbpHeaderSize;
 383         if (length < 8) {
 384                 /* must be room for at least one tuple */
 385                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 386                 return;
 387         }
 388         /* ep points to end of available data */
 389         ep = snapend;
 390         if ((const u_char *)tp > ep) {
 391                 fputs(tstr, stdout);
 392                 return;
 393         }
 394         switch (i = np->control & 0xf0) {
 395
 396         case nbpBrRq:
 397         case nbpLkUp:
 398                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 399                              np->id);
 400                 if ((const u_char *)(tp + 1) > ep) {
 401                         fputs(tstr, stdout);
 402                         return;
 403                 }
 404                 (void)nbp_name_print(tp, ep);
 405                 /*
 406                  * look for anomalies: the spec says there can only
 407                  * be one tuple, the address must match the source
 408                  * address and the enumerator should be zero.
 409                  */
 410                 if ((np->control & 0xf) != 1)
 411                         (void)printf(" [ntup=%d]", np->control & 0xf);
 412                 if (tp->enumerator)
 413                         (void)printf(" [enum=%d]", tp->enumerator);
 414                 if (EXTRACT_16BITS(&tp->net) != snet ||
 415                     tp->node != snode || tp->skt != skt)
 416                         (void)printf(" [addr=%s.%d]",
 417                             ataddr_string(EXTRACT_16BITS(&tp->net),
 418                             tp->node), tp->skt);
 419                 break;
 420
 421         case nbpLkUpReply:
 422                 (void)printf(" nbp-reply %d:", np->id);
 423
 424                 /* print each of the tuples in the reply */
 425                 for (i = np->control & 0xf; --i >= 0 && tp; )
 426                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 427                 break;
 428
 429         default:
 430                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 431                                 length);
 432                 break;
 433         }
 434 }
 435
 436 /* print a counted string */
 437 static const char *
 438 print_cstring(register const char *cp, register const u_char *ep)
 439 {
 440         register u_int length;
 441
 442         if (cp >= (const char *)ep) {
 443                 fputs(tstr, stdout);
 444                 return (0);
 445         }
 446         length = *cp++;
 447
 448         /* Spec says string can be at most 32 bytes long */
 449         if (length > 32) {
 450                 (void)printf("[len=%u]", length);
 451                 return (0);
 452         }
 453         while ((int)--length >= 0) {
 454                 if (cp >= (char *)ep) {
 455                         fputs(tstr, stdout);
 456                         return (0);
 457                 }
 458                 putchar(*cp++);
 459         }
 460         return (cp);
 461 }
 462
 463 static const struct atNBPtuple *
 464 nbp_tuple_print(register const struct atNBPtuple *tp,
 465                 register const u_char *ep,
 466                 register u_short snet, register u_char snode,
 467                 register u_char skt)
 468 {
 469         register const struct atNBPtuple *tpn;
 470
 471         if ((const u_char *)(tp + 1) > ep) {
 472                 fputs(tstr, stdout);
 473                 return 0;
 474         }
 475         tpn = nbp_name_print(tp, ep);
 476
 477         /* if the enumerator isn't 1, print it */
 478         if (tp->enumerator != 1)
 479                 (void)printf("(%d)", tp->enumerator);
 480
 481         /* if the socket doesn't match the src socket, print it */
 482         if (tp->skt != skt)
 483                 (void)printf(" %d", tp->skt);
 484
 485         /* if the address doesn't match the src address, it's an anomaly */
 486         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 487                 (void)printf(" [addr=%s]",
 488                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 489
 490         return (tpn);
 491 }
 492
 493 static const struct atNBPtuple *
 494 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 495 {
 496         register const char *cp = (const char *)tp + nbpTupleSize;
 497
 498         putchar(' ');
 499
 500         /* Object */
 501         putchar('"');
 502         if ((cp = print_cstring(cp, ep)) != NULL) {
 503                 /* Type */
 504                 putchar(':');
 505                 if ((cp = print_cstring(cp, ep)) != NULL) {
 506                         /* Zone */
 507                         putchar('@');
 508                         if ((cp = print_cstring(cp, ep)) != NULL)
 509                                 putchar('"');
 510                 }
 511         }
 512         return ((const struct atNBPtuple *)cp);
 513 }
 514
 515
 516 #define HASHNAMESIZE 4096
 517
 518 struct hnamemem {
 519         int addr;
 520         char *name;
 521         struct hnamemem *nxt;
 522 };
 523
 524 static struct hnamemem hnametable[HASHNAMESIZE];
 525
 526 static const char *
 527 ataddr_string(u_short atnet, u_char athost)
 528 {
 529         register struct hnamemem *tp, *tp2;
 530         register int i = (atnet << 8) | athost;
 531         char nambuf[MAXHOSTNAMELEN + 20];
 532         static int first = 1;
 533         FILE *fp;
 534
 535         /*
 536          * if this is the first call, see if there's an AppleTalk
 537          * number to name map file.
 538          */
 539         if (first && (first = 0, !nflag)
 540             && (fp = fopen("/etc/atalk.names", "r"))) {
 541                 char line[256];
 542                 int i1, i2, i3;
 543
 544                 while (fgets(line, sizeof(line), fp)) {
 545                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 546                                 continue;
 547                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 548                                      nambuf) == 4)
 549                                 /* got a hostname. */
 550                                 i3 |= ((i1 << 8) | i2) << 8;
 551                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 552                                         nambuf) == 3)
 553                                 /* got a net name */
 554                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 555                         else
 556                                 continue;
 557
 558                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 559                              tp->nxt; tp = tp->nxt)
 560                                 ;
 561                         tp->addr = i3;
 562                         tp->nxt = newhnamemem();
 563                         tp->name = strdup(nambuf);
 564                 }
 565                 fclose(fp);
 566         }
 567
 568         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 569                 if (tp->addr == i)
 570                         return (tp->name);
 571
 572         /* didn't have the node name -- see if we've got the net name */
 573         i |= 255;
 574         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 575                 if (tp2->addr == i) {
 576                         tp->addr = (atnet << 8) | athost;
 577                         tp->nxt = newhnamemem();
 578                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 579                             tp2->name, athost);
 580                         tp->name = strdup(nambuf);
 581                         return (tp->name);
 582                 }
 583
 584         tp->addr = (atnet << 8) | athost;
 585         tp->nxt = newhnamemem();
 586         if (athost != 255)
 587                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 588                     atnet >> 8, atnet & 0xff, athost);
 589         else
 590                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 591                     atnet & 0xff);
 592         tp->name = strdup(nambuf);
 593
 594         return (tp->name);
 595 }
 596
 597 static struct tok skt2str[] = {
 598         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 599         { nbpSkt,       "nis" },        /* name info socket */
 600         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 601         { zipSkt,       "zip" },        /* zone info protocol */
 602         { 0,            NULL }
 603 };
 604
 605 static const char *
 606 ddpskt_string(register int skt)
 607 {
 608         static char buf[8];
 609
 610         if (nflag) {
 611                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 612                 return (buf);
 613         }
 614         return (tok2str(skt2str, "%d", skt));
 615 }