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 1.66 2001-06-18 08:52:53 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         ts_print(&h->ts);
  94         llap_print(p, h->caplen);
  95         if(xflag)
  96                 default_print(p, h->caplen);
  97         putchar('\n');
  98 }
  99
 100 /*
 101  * Print AppleTalk LLAP packets.
 102  */
 103 void
 104 llap_print(register const u_char *bp, u_int length)
 105 {
 106         register const struct LAP *lp;
 107         register const struct atDDP *dp;
 108         register const struct atShortDDP *sdp;
 109         u_short snet;
 110
 111         lp = (struct LAP *)bp;
 112         bp += sizeof(*lp);
 113         length -= sizeof(*lp);
 114         switch (lp->type) {
 115
 116         case lapShortDDP:
 117                 if (length < ddpSSize) {
 118                         (void)printf(" [|sddp %d]", length);
 119                         return;
 120                 }
 121                 sdp = (const struct atShortDDP *)bp;
 122                 printf("%s.%s",
 123                     ataddr_string(0, lp->src), ddpskt_string(sdp->srcSkt));
 124                 printf(" > %s.%s:",
 125                     ataddr_string(0, lp->dst), ddpskt_string(sdp->dstSkt));
 126                 bp += ddpSSize;
 127                 length -= ddpSSize;
 128                 ddp_print(bp, length, sdp->type, 0, lp->src, sdp->srcSkt);
 129                 break;
 130
 131         case lapDDP:
 132                 if (length < ddpSize) {
 133                         (void)printf(" [|ddp %d]", length);
 134                         return;
 135                 }
 136                 dp = (const struct atDDP *)bp;
 137                 snet = EXTRACT_16BITS(&dp->srcNet);
 138                 printf("%s.%s", ataddr_string(snet, dp->srcNode),
 139                     ddpskt_string(dp->srcSkt));
 140                 printf(" > %s.%s:",
 141                     ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 142                     ddpskt_string(dp->dstSkt));
 143                 bp += ddpSize;
 144                 length -= ddpSize;
 145                 ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 146                 break;
 147
 148 #ifdef notdef
 149         case lapKLAP:
 150                 klap_print(bp, length);
 151                 break;
 152 #endif
 153
 154         default:
 155                 printf("%d > %d at-lap#%d %d",
 156                     lp->src, lp->dst, lp->type, length);
 157                 break;
 158         }
 159 }
 160
 161 /*
 162  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 163  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 164  * packets in them).
 165  */
 166 void
 167 atalk_print(register const u_char *bp, u_int length)
 168 {
 169         register const struct atDDP *dp;
 170         u_short snet;
 171
 172         if (length < ddpSize) {
 173           (void)printf(" [|ddp %d]", length);
 174           return;
 175         }
 176         dp = (const struct atDDP *)bp;
 177         snet = EXTRACT_16BITS(&dp->srcNet);
 178         printf("%s.%s", ataddr_string(snet, dp->srcNode),
 179                ddpskt_string(dp->srcSkt));
 180         printf(" > %s.%s:",
 181                ataddr_string(EXTRACT_16BITS(&dp->dstNet), dp->dstNode),
 182                ddpskt_string(dp->dstSkt));
 183         bp += ddpSize;
 184         length -= ddpSize;
 185         ddp_print(bp, length, dp->type, snet, dp->srcNode, dp->srcSkt);
 186 }
 187
 188 /* XXX should probably pass in the snap header and do checks like arp_print() */
 189 void
 190 aarp_print(register const u_char *bp, u_int length)
 191 {
 192         register const struct aarp *ap;
 193
 194 #define AT(member) ataddr_string((ap->member[1]<<8)|ap->member[2],ap->member[3])
 195
 196         printf("aarp ");
 197         ap = (const struct aarp *)bp;
 198         if (ntohs(ap->htype) == 1 && ntohs(ap->ptype) == ETHERTYPE_ATALK &&
 199             ap->halen == 6 && ap->palen == 4 )
 200                 switch (ntohs(ap->op)) {
 201
 202                 case 1:                         /* request */
 203                         (void)printf("who-has %s tell %s",
 204                             AT(pdaddr), AT(psaddr));
 205                         return;
 206
 207                 case 2:                         /* response */
 208                         (void)printf("reply %s is-at %s",
 209                             AT(pdaddr), etheraddr_string(ap->hdaddr));
 210                         return;
 211
 212                 case 3:                         /* probe (oy!) */
 213                         (void)printf("probe %s tell %s",
 214                             AT(pdaddr), AT(psaddr));
 215                         return;
 216                 }
 217         (void)printf("len %u op %u htype %u ptype %#x halen %u palen %u",
 218             length, ntohs(ap->op), ntohs(ap->htype), ntohs(ap->ptype),
 219             ap->halen, ap->palen);
 220 }
 221
 222 /*
 223  * Print AppleTalk Datagram Delivery Protocol packets.
 224  */
 225 static void
 226 ddp_print(register const u_char *bp, register u_int length, register int t,
 227           register u_short snet, register u_char snode, u_char skt)
 228 {
 229
 230         switch (t) {
 231
 232         case ddpNBP:
 233                 nbp_print((const struct atNBP *)bp, length, snet, snode, skt);
 234                 break;
 235
 236         case ddpATP:
 237                 atp_print((const struct atATP *)bp, length);
 238                 break;
 239
 240         default:
 241                 (void)printf(" at-%s %d", tok2str(type2str, NULL, t), length);
 242                 break;
 243         }
 244 }
 245
 246 static void
 247 atp_print(register const struct atATP *ap, u_int length)
 248 {
 249         char c;
 250         u_int32_t data;
 251
 252         if ((const u_char *)(ap + 1) > snapend) {
 253                 /* Just bail if we don't have the whole chunk. */
 254                 fputs(tstr, stdout);
 255                 return;
 256         }
 257         length -= sizeof(*ap);
 258         switch (ap->control & 0xc0) {
 259
 260         case atpReqCode:
 261                 (void)printf(" atp-req%s %d",
 262                              ap->control & atpXO? " " : "*",
 263                              EXTRACT_16BITS(&ap->transID));
 264
 265                 atp_bitmap_print(ap->bitmap);
 266
 267                 if (length != 0)
 268                         (void)printf(" [len=%d]", length);
 269
 270                 switch (ap->control & (atpEOM|atpSTS)) {
 271                 case atpEOM:
 272                         (void)printf(" [EOM]");
 273                         break;
 274                 case atpSTS:
 275                         (void)printf(" [STS]");
 276                         break;
 277                 case atpEOM|atpSTS:
 278                         (void)printf(" [EOM,STS]");
 279                         break;
 280                 }
 281                 break;
 282
 283         case atpRspCode:
 284                 (void)printf(" atp-resp%s%d:%d (%d)",
 285                              ap->control & atpEOM? "*" : " ",
 286                              EXTRACT_16BITS(&ap->transID), ap->bitmap, length);
 287                 switch (ap->control & (atpXO|atpSTS)) {
 288                 case atpXO:
 289                         (void)printf(" [XO]");
 290                         break;
 291                 case atpSTS:
 292                         (void)printf(" [STS]");
 293                         break;
 294                 case atpXO|atpSTS:
 295                         (void)printf(" [XO,STS]");
 296                         break;
 297                 }
 298                 break;
 299
 300         case atpRelCode:
 301                 (void)printf(" atp-rel  %d", EXTRACT_16BITS(&ap->transID));
 302
 303                 atp_bitmap_print(ap->bitmap);
 304
 305                 /* length should be zero */
 306                 if (length)
 307                         (void)printf(" [len=%d]", length);
 308
 309                 /* there shouldn't be any control flags */
 310                 if (ap->control & (atpXO|atpEOM|atpSTS)) {
 311                         c = '[';
 312                         if (ap->control & atpXO) {
 313                                 (void)printf("%cXO", c);
 314                                 c = ',';
 315                         }
 316                         if (ap->control & atpEOM) {
 317                                 (void)printf("%cEOM", c);
 318                                 c = ',';
 319                         }
 320                         if (ap->control & atpSTS) {
 321                                 (void)printf("%cSTS", c);
 322                                 c = ',';
 323                         }
 324                         (void)printf("]");
 325                 }
 326                 break;
 327
 328         default:
 329                 (void)printf(" atp-0x%x  %d (%d)", ap->control,
 330                              EXTRACT_16BITS(&ap->transID), length);
 331                 break;
 332         }
 333         data = EXTRACT_32BITS(&ap->userData);
 334         if (data != 0)
 335                 (void)printf(" 0x%x", data);
 336 }
 337
 338 static void
 339 atp_bitmap_print(register u_char bm)
 340 {
 341         register char c;
 342         register int i;
 343
 344         /*
 345          * The '& 0xff' below is needed for compilers that want to sign
 346          * extend a u_char, which is the case with the Ultrix compiler.
 347          * (gcc is smart enough to eliminate it, at least on the Sparc).
 348          */
 349         if ((bm + 1) & (bm & 0xff)) {
 350                 c = '<';
 351                 for (i = 0; bm; ++i) {
 352                         if (bm & 1) {
 353                                 (void)printf("%c%d", c, i);
 354                                 c = ',';
 355                         }
 356                         bm >>= 1;
 357                 }
 358                 (void)printf(">");
 359         } else {
 360                 for (i = 0; bm; ++i)
 361                         bm >>= 1;
 362                 if (i > 1)
 363                         (void)printf("<0-%d>", i - 1);
 364                 else
 365                         (void)printf("<0>");
 366         }
 367 }
 368
 369 static void
 370 nbp_print(register const struct atNBP *np, u_int length, register u_short snet,
 371           register u_char snode, register u_char skt)
 372 {
 373         register const struct atNBPtuple *tp =
 374                         (struct atNBPtuple *)((u_char *)np + nbpHeaderSize);
 375         int i;
 376         const u_char *ep;
 377
 378         length -= nbpHeaderSize;
 379         if (length < 8) {
 380                 /* must be room for at least one tuple */
 381                 (void)printf(" truncated-nbp %d", length + nbpHeaderSize);
 382                 return;
 383         }
 384         /* ep points to end of available data */
 385         ep = snapend;
 386         if ((const u_char *)tp > ep) {
 387                 fputs(tstr, stdout);
 388                 return;
 389         }
 390         switch (i = np->control & 0xf0) {
 391
 392         case nbpBrRq:
 393         case nbpLkUp:
 394                 (void)printf(i == nbpLkUp? " nbp-lkup %d:":" nbp-brRq %d:",
 395                              np->id);
 396                 if ((const u_char *)(tp + 1) > ep) {
 397                         fputs(tstr, stdout);
 398                         return;
 399                 }
 400                 (void)nbp_name_print(tp, ep);
 401                 /*
 402                  * look for anomalies: the spec says there can only
 403                  * be one tuple, the address must match the source
 404                  * address and the enumerator should be zero.
 405                  */
 406                 if ((np->control & 0xf) != 1)
 407                         (void)printf(" [ntup=%d]", np->control & 0xf);
 408                 if (tp->enumerator)
 409                         (void)printf(" [enum=%d]", tp->enumerator);
 410                 if (EXTRACT_16BITS(&tp->net) != snet ||
 411                     tp->node != snode || tp->skt != skt)
 412                         (void)printf(" [addr=%s.%d]",
 413                             ataddr_string(EXTRACT_16BITS(&tp->net),
 414                             tp->node), tp->skt);
 415                 break;
 416
 417         case nbpLkUpReply:
 418                 (void)printf(" nbp-reply %d:", np->id);
 419
 420                 /* print each of the tuples in the reply */
 421                 for (i = np->control & 0xf; --i >= 0 && tp; )
 422                         tp = nbp_tuple_print(tp, ep, snet, snode, skt);
 423                 break;
 424
 425         default:
 426                 (void)printf(" nbp-0x%x  %d (%d)", np->control, np->id,
 427                                 length);
 428                 break;
 429         }
 430 }
 431
 432 /* print a counted string */
 433 static const char *
 434 print_cstring(register const char *cp, register const u_char *ep)
 435 {
 436         register u_int length;
 437
 438         if (cp >= (const char *)ep) {
 439                 fputs(tstr, stdout);
 440                 return (0);
 441         }
 442         length = *cp++;
 443
 444         /* Spec says string can be at most 32 bytes long */
 445         if (length > 32) {
 446                 (void)printf("[len=%u]", length);
 447                 return (0);
 448         }
 449         while ((int)--length >= 0) {
 450                 if (cp >= (char *)ep) {
 451                         fputs(tstr, stdout);
 452                         return (0);
 453                 }
 454                 putchar(*cp++);
 455         }
 456         return (cp);
 457 }
 458
 459 static const struct atNBPtuple *
 460 nbp_tuple_print(register const struct atNBPtuple *tp,
 461                 register const u_char *ep,
 462                 register u_short snet, register u_char snode,
 463                 register u_char skt)
 464 {
 465         register const struct atNBPtuple *tpn;
 466
 467         if ((const u_char *)(tp + 1) > ep) {
 468                 fputs(tstr, stdout);
 469                 return 0;
 470         }
 471         tpn = nbp_name_print(tp, ep);
 472
 473         /* if the enumerator isn't 1, print it */
 474         if (tp->enumerator != 1)
 475                 (void)printf("(%d)", tp->enumerator);
 476
 477         /* if the socket doesn't match the src socket, print it */
 478         if (tp->skt != skt)
 479                 (void)printf(" %d", tp->skt);
 480
 481         /* if the address doesn't match the src address, it's an anomaly */
 482         if (EXTRACT_16BITS(&tp->net) != snet || tp->node != snode)
 483                 (void)printf(" [addr=%s]",
 484                     ataddr_string(EXTRACT_16BITS(&tp->net), tp->node));
 485
 486         return (tpn);
 487 }
 488
 489 static const struct atNBPtuple *
 490 nbp_name_print(const struct atNBPtuple *tp, register const u_char *ep)
 491 {
 492         register const char *cp = (const char *)tp + nbpTupleSize;
 493
 494         putchar(' ');
 495
 496         /* Object */
 497         putchar('"');
 498         if ((cp = print_cstring(cp, ep)) != NULL) {
 499                 /* Type */
 500                 putchar(':');
 501                 if ((cp = print_cstring(cp, ep)) != NULL) {
 502                         /* Zone */
 503                         putchar('@');
 504                         if ((cp = print_cstring(cp, ep)) != NULL)
 505                                 putchar('"');
 506                 }
 507         }
 508         return ((const struct atNBPtuple *)cp);
 509 }
 510
 511
 512 #define HASHNAMESIZE 4096
 513
 514 struct hnamemem {
 515         int addr;
 516         char *name;
 517         struct hnamemem *nxt;
 518 };
 519
 520 static struct hnamemem hnametable[HASHNAMESIZE];
 521
 522 static const char *
 523 ataddr_string(u_short atnet, u_char athost)
 524 {
 525         register struct hnamemem *tp, *tp2;
 526         register int i = (atnet << 8) | athost;
 527         char nambuf[MAXHOSTNAMELEN + 20];
 528         static int first = 1;
 529         FILE *fp;
 530
 531         /*
 532          * if this is the first call, see if there's an AppleTalk
 533          * number to name map file.
 534          */
 535         if (first && (first = 0, !nflag)
 536             && (fp = fopen("/etc/atalk.names", "r"))) {
 537                 char line[256];
 538                 int i1, i2, i3;
 539
 540                 while (fgets(line, sizeof(line), fp)) {
 541                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 542                                 continue;
 543                         if (sscanf(line, "%d.%d.%d %256s", &i1, &i2, &i3,
 544                                      nambuf) == 4)
 545                                 /* got a hostname. */
 546                                 i3 |= ((i1 << 8) | i2) << 8;
 547                         else if (sscanf(line, "%d.%d %256s", &i1, &i2,
 548                                         nambuf) == 3)
 549                                 /* got a net name */
 550                                 i3 = (((i1 << 8) | i2) << 8) | 255;
 551                         else
 552                                 continue;
 553
 554                         for (tp = &hnametable[i3 & (HASHNAMESIZE-1)];
 555                              tp->nxt; tp = tp->nxt)
 556                                 ;
 557                         tp->addr = i3;
 558                         tp->nxt = newhnamemem();
 559                         tp->name = strdup(nambuf);
 560                 }
 561                 fclose(fp);
 562         }
 563
 564         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 565                 if (tp->addr == i)
 566                         return (tp->name);
 567
 568         /* didn't have the node name -- see if we've got the net name */
 569         i |= 255;
 570         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 571                 if (tp2->addr == i) {
 572                         tp->addr = (atnet << 8) | athost;
 573                         tp->nxt = newhnamemem();
 574                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 575                             tp2->name, athost);
 576                         tp->name = strdup(nambuf);
 577                         return (tp->name);
 578                 }
 579
 580         tp->addr = (atnet << 8) | athost;
 581         tp->nxt = newhnamemem();
 582         if (athost != 255)
 583                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d.%d",
 584                     atnet >> 8, atnet & 0xff, athost);
 585         else
 586                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet >> 8,
 587                     atnet & 0xff);
 588         tp->name = strdup(nambuf);
 589
 590         return (tp->name);
 591 }
 592
 593 static struct tok skt2str[] = {
 594         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 595         { nbpSkt,       "nis" },        /* name info socket */
 596         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 597         { zipSkt,       "zip" },        /* zone info protocol */
 598         { 0,            NULL }
 599 };
 600
 601 static const char *
 602 ddpskt_string(register int skt)
 603 {
 604         static char buf[8];
 605
 606         if (nflag) {
 607                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 608                 return (buf);
 609         }
 610         return (tok2str(skt2str, "%d", skt));
 611 }