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
  22 /* \summary: AppleTalk printer */
  23
  24 #ifdef HAVE_CONFIG_H
  25 #include "config.h"
  26 #endif
  27
  28 #include <netdissect-stdinc.h>
  29
  30 #include <stdio.h>
  31 #include <string.h>
  32
  33 #include "netdissect.h"
  34 #include "addrtoname.h"
  35 #include "ethertype.h"
  36 #include "extract.h"
  37 #include "appletalk.h"
  38
  39 static const char tstr[] = "[|atalk]";
  40
  41 static const struct tok type2str[] = {
  42         { ddpRTMP,              "rtmp" },
  43         { ddpRTMPrequest,       "rtmpReq" },
  44         { ddpECHO,              "echo" },
  45         { ddpIP,                "IP" },
  46         { ddpARP,               "ARP" },
  47         { ddpKLAP,              "KLAP" },
  48         { 0,                    NULL }
  49 };
  50
  51 struct aarp {
  52         nd_uint16_t     htype, ptype;
  53         nd_uint8_t      halen, palen;
  54         nd_uint16_t     op;
  55         uint8_t         hsaddr[6];
  56         uint8_t         psaddr[4];
  57         uint8_t         hdaddr[6];
  58         uint8_t         pdaddr[4];
  59 };
  60
  61 static void atp_print(netdissect_options *, const struct atATP *, u_int);
  62 static void atp_bitmap_print(netdissect_options *, u_char);
  63 static void nbp_print(netdissect_options *, const struct atNBP *, u_int, u_short, u_char, u_char);
  64 static const struct atNBPtuple *nbp_tuple_print(netdissect_options *ndo, const struct atNBPtuple *,
  65                                                 const u_char *,
  66                                                 u_short, u_char, u_char);
  67 static const struct atNBPtuple *nbp_name_print(netdissect_options *, const struct atNBPtuple *,
  68                                                const u_char *);
  69 static const char *ataddr_string(netdissect_options *, u_short, u_char);
  70 static void ddp_print(netdissect_options *, const u_char *, u_int, int, u_short, u_char, u_char);
  71 static const char *ddpskt_string(netdissect_options *, int);
  72
  73 /*
  74  * Print LLAP packets received on a physical LocalTalk interface.
  75  */
  76 u_int
  77 ltalk_if_print(netdissect_options *ndo,
  78                const struct pcap_pkthdr *h, const u_char *p)
  79 {
  80         u_int hdrlen;
  81
  82         hdrlen = llap_print(ndo, p, h->len);
  83         if (hdrlen == 0) {
  84                 /* Cut short by the snapshot length. */
  85                 return (h->caplen);
  86         }
  87         return (hdrlen);
  88 }
  89
  90 /*
  91  * Print AppleTalk LLAP packets.
  92  */
  93 u_int
  94 llap_print(netdissect_options *ndo,
  95            const u_char *bp, u_int length)
  96 {
  97         const struct LAP *lp;
  98         const struct atDDP *dp;
  99         const struct atShortDDP *sdp;
 100         u_short snet;
 101         u_int hdrlen;
 102
 103         if (length < sizeof(*lp)) {
 104                 ND_PRINT((ndo, " [|llap %u]", length));
 105                 return (length);
 106         }
 107         if (!ND_TTEST_LEN(bp, sizeof(*lp))) {
 108                 ND_PRINT((ndo, " [|llap]"));
 109                 return (0);     /* cut short by the snapshot length */
 110         }
 111         lp = (const struct LAP *)bp;
 112         bp += sizeof(*lp);
 113         length -= sizeof(*lp);
 114         hdrlen = sizeof(*lp);
 115         switch (EXTRACT_U_1(lp->type)) {
 116
 117         case lapShortDDP:
 118                 if (length < ddpSSize) {
 119                         ND_PRINT((ndo, " [|sddp %u]", length));
 120                         return (length);
 121                 }
 122                 if (!ND_TTEST_LEN(bp, ddpSSize)) {
 123                         ND_PRINT((ndo, " [|sddp]"));
 124                         return (0);     /* cut short by the snapshot length */
 125                 }
 126                 sdp = (const struct atShortDDP *)bp;
 127                 ND_PRINT((ndo, "%s.%s",
 128                     ataddr_string(ndo, 0, EXTRACT_U_1(lp->src)), ddpskt_string(ndo, EXTRACT_U_1(sdp->srcSkt))));
 129                 ND_PRINT((ndo, " > %s.%s:",
 130                     ataddr_string(ndo, 0, EXTRACT_U_1(lp->dst)), ddpskt_string(ndo, EXTRACT_U_1(sdp->dstSkt))));
 131                 bp += ddpSSize;
 132                 length -= ddpSSize;
 133                 hdrlen += ddpSSize;
 134                 ddp_print(ndo, bp, length, EXTRACT_U_1(sdp->type), 0, EXTRACT_U_1(lp->src), EXTRACT_U_1(sdp->srcSkt));
 135                 break;
 136
 137         case lapDDP:
 138                 if (length < ddpSize) {
 139                         ND_PRINT((ndo, " [|ddp %u]", length));
 140                         return (length);
 141                 }
 142                 if (!ND_TTEST_LEN(bp, ddpSize)) {
 143                         ND_PRINT((ndo, " [|ddp]"));
 144                         return (0);     /* cut short by the snapshot length */
 145                 }
 146                 dp = (const struct atDDP *)bp;
 147                 snet = EXTRACT_BE_U_2(dp->srcNet);
 148                 ND_PRINT((ndo, "%s.%s", ataddr_string(ndo, snet, EXTRACT_U_1(dp->srcNode)),
 149                     ddpskt_string(ndo, EXTRACT_U_1(dp->srcSkt))));
 150                 ND_PRINT((ndo, " > %s.%s:",
 151                     ataddr_string(ndo, EXTRACT_BE_U_2(dp->dstNet), EXTRACT_U_1(dp->dstNode)),
 152                     ddpskt_string(ndo, EXTRACT_U_1(dp->dstSkt))));
 153                 bp += ddpSize;
 154                 length -= ddpSize;
 155                 hdrlen += ddpSize;
 156                 ddp_print(ndo, bp, length, EXTRACT_U_1(dp->type), snet, EXTRACT_U_1(dp->srcNode), EXTRACT_U_1(dp->srcSkt));
 157                 break;
 158
 159 #ifdef notdef
 160         case lapKLAP:
 161                 klap_print(bp, length);
 162                 break;
 163 #endif
 164
 165         default:
 166                 ND_PRINT((ndo, "%u > %u at-lap#%u %u",
 167                     EXTRACT_U_1(lp->src), EXTRACT_U_1(lp->dst), EXTRACT_U_1(lp->type), length));
 168                 break;
 169         }
 170         return (hdrlen);
 171 }
 172
 173 /*
 174  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 175  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 176  * packets in them).
 177  */
 178 void
 179 atalk_print(netdissect_options *ndo,
 180             const u_char *bp, u_int length)
 181 {
 182         const struct atDDP *dp;
 183         u_short snet;
 184
 185         if(!ndo->ndo_eflag)
 186             ND_PRINT((ndo, "AT "));
 187
 188         if (length < ddpSize) {
 189                 ND_PRINT((ndo, " [|ddp %u]", length));
 190                 return;
 191         }
 192         if (!ND_TTEST_LEN(bp, ddpSize)) {
 193                 ND_PRINT((ndo, " [|ddp]"));
 194                 return;
 195         }
 196         dp = (const struct atDDP *)bp;
 197         snet = EXTRACT_BE_U_2(dp->srcNet);
 198         ND_PRINT((ndo, "%s.%s", ataddr_string(ndo, snet, EXTRACT_U_1(dp->srcNode)),
 199                ddpskt_string(ndo, EXTRACT_U_1(dp->srcSkt))));
 200         ND_PRINT((ndo, " > %s.%s: ",
 201                ataddr_string(ndo, EXTRACT_BE_U_2(dp->dstNet), EXTRACT_U_1(dp->dstNode)),
 202                ddpskt_string(ndo, EXTRACT_U_1(dp->dstSkt))));
 203         bp += ddpSize;
 204         length -= ddpSize;
 205         ddp_print(ndo, bp, length, EXTRACT_U_1(dp->type), snet, EXTRACT_U_1(dp->srcNode), EXTRACT_U_1(dp->srcSkt));
 206 }
 207
 208 /* XXX should probably pass in the snap header and do checks like arp_print() */
 209 void
 210 aarp_print(netdissect_options *ndo,
 211            const u_char *bp, u_int length)
 212 {
 213         const struct aarp *ap;
 214
 215 #define AT(member) ataddr_string(ndo, (ap->member[1]<<8)|ap->member[2],ap->member[3])
 216
 217         ND_PRINT((ndo, "aarp "));
 218         ap = (const struct aarp *)bp;
 219         if (!ND_TTEST(*ap)) {
 220                 /* Just bail if we don't have the whole chunk. */
 221                 ND_PRINT((ndo, " [|aarp]"));
 222                 return;
 223         }
 224         if (length < sizeof(*ap)) {
 225                 ND_PRINT((ndo, " [|aarp %u]", length));
 226                 return;
 227         }
 228         if (EXTRACT_BE_U_2(ap->htype) == 1 &&
 229             EXTRACT_BE_U_2(ap->ptype) == ETHERTYPE_ATALK &&
 230             EXTRACT_U_1(ap->halen) == 6 && EXTRACT_U_1(ap->palen) == 4 )
 231                 switch (EXTRACT_BE_U_2(ap->op)) {
 232
 233                 case 1:                         /* request */
 234                         ND_PRINT((ndo, "who-has %s tell %s", AT(pdaddr), AT(psaddr)));
 235                         return;
 236
 237                 case 2:                         /* response */
 238                         ND_PRINT((ndo, "reply %s is-at %s", AT(psaddr), etheraddr_string(ndo, ap->hsaddr)));
 239                         return;
 240
 241                 case 3:                         /* probe (oy!) */
 242                         ND_PRINT((ndo, "probe %s tell %s", AT(pdaddr), AT(psaddr)));
 243                         return;
 244                 }
 245         ND_PRINT((ndo, "len %u op %u htype %u ptype %#x halen %u palen %u",
 246             length, EXTRACT_BE_U_2(ap->op), EXTRACT_BE_U_2(ap->htype),
 247             EXTRACT_BE_U_2(ap->ptype), EXTRACT_U_1(ap->halen), EXTRACT_U_1(ap->palen)));
 248 }
 249
 250 /*
 251  * Print AppleTalk Datagram Delivery Protocol packets.
 252  */
 253 static void
 254 ddp_print(netdissect_options *ndo,
 255           const u_char *bp, u_int length, int t,
 256           u_short snet, u_char snode, u_char skt)
 257 {
 258
 259         switch (t) {
 260
 261         case ddpNBP:
 262                 nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
 263                 break;
 264
 265         case ddpATP:
 266                 atp_print(ndo, (const struct atATP *)bp, length);
 267                 break;
 268
 269         case ddpEIGRP:
 270                 eigrp_print(ndo, bp, length);
 271                 break;
 272
 273         default:
 274                 ND_PRINT((ndo, " at-%s %d", tok2str(type2str, NULL, t), length));
 275                 break;
 276         }
 277 }
 278
 279 static void
 280 atp_print(netdissect_options *ndo,
 281           const struct atATP *ap, u_int length)
 282 {
 283         uint8_t control;
 284         uint32_t data;
 285
 286         if ((const u_char *)(ap + 1) > ndo->ndo_snapend) {
 287                 /* Just bail if we don't have the whole chunk. */
 288                 ND_PRINT((ndo, "%s", tstr));
 289                 return;
 290         }
 291         if (length < sizeof(*ap)) {
 292                 ND_PRINT((ndo, " [|atp %u]", length));
 293                 return;
 294         }
 295         length -= sizeof(*ap);
 296         control = EXTRACT_U_1(ap->control);
 297         switch (control & 0xc0) {
 298
 299         case atpReqCode:
 300                 ND_PRINT((ndo, " atp-req%s %u",
 301                              control & atpXO? " " : "*",
 302                              EXTRACT_BE_U_2(ap->transID)));
 303
 304                 atp_bitmap_print(ndo, EXTRACT_U_1(ap->bitmap));
 305
 306                 if (length != 0)
 307                         ND_PRINT((ndo, " [len=%u]", length));
 308
 309                 switch (control & (atpEOM|atpSTS)) {
 310                 case atpEOM:
 311                         ND_PRINT((ndo, " [EOM]"));
 312                         break;
 313                 case atpSTS:
 314                         ND_PRINT((ndo, " [STS]"));
 315                         break;
 316                 case atpEOM|atpSTS:
 317                         ND_PRINT((ndo, " [EOM,STS]"));
 318                         break;
 319                 }
 320                 break;
 321
 322         case atpRspCode:
 323                 ND_PRINT((ndo, " atp-resp%s%d:%u (%u)",
 324                              control & atpEOM? "*" : " ",
 325                              EXTRACT_BE_U_2(ap->transID), EXTRACT_U_1(ap->bitmap), length));
 326                 switch (control & (atpXO|atpSTS)) {
 327                 case atpXO:
 328                         ND_PRINT((ndo, " [XO]"));
 329                         break;
 330                 case atpSTS:
 331                         ND_PRINT((ndo, " [STS]"));
 332                         break;
 333                 case atpXO|atpSTS:
 334                         ND_PRINT((ndo, " [XO,STS]"));
 335                         break;
 336                 }
 337                 break;
 338
 339         case atpRelCode:
 340                 ND_PRINT((ndo, " atp-rel  %u", EXTRACT_BE_U_2(ap->transID)));
 341
 342                 atp_bitmap_print(ndo, EXTRACT_U_1(ap->bitmap));
 343
 344                 /* length should be zero */
 345                 if (length)
 346                         ND_PRINT((ndo, " [len=%u]", length));
 347
 348                 /* there shouldn't be any control flags */
 349                 if (control & (atpXO|atpEOM|atpSTS)) {
 350                         char c = '[';
 351                         if (control & atpXO) {
 352                                 ND_PRINT((ndo, "%cXO", c));
 353                                 c = ',';
 354                         }
 355                         if (control & atpEOM) {
 356                                 ND_PRINT((ndo, "%cEOM", c));
 357                                 c = ',';
 358                         }
 359                         if (control & atpSTS) {
 360                                 ND_PRINT((ndo, "%cSTS", c));
 361                         }
 362                         ND_PRINT((ndo, "]"));
 363                 }
 364                 break;
 365
 366         default:
 367                 ND_PRINT((ndo, " atp-0x%x  %d (%u)", control,
 368                              EXTRACT_BE_U_2(ap->transID), length));
 369                 break;
 370         }
 371         data = EXTRACT_BE_U_4(ap->userData);
 372         if (data != 0)
 373                 ND_PRINT((ndo, " 0x%x", data));
 374 }
 375
 376 static void
 377 atp_bitmap_print(netdissect_options *ndo,
 378                  u_char bm)
 379 {
 380         int i;
 381
 382         /*
 383          * The '& 0xff' below is needed for compilers that want to sign
 384          * extend a u_char, which is the case with the Ultrix compiler.
 385          * (gcc is smart enough to eliminate it, at least on the Sparc).
 386          */
 387         if ((bm + 1) & (bm & 0xff)) {
 388                 char c = '<';
 389                 for (i = 0; bm; ++i) {
 390                         if (bm & 1) {
 391                                 ND_PRINT((ndo, "%c%d", c, i));
 392                                 c = ',';
 393                         }
 394                         bm >>= 1;
 395                 }
 396                 ND_PRINT((ndo, ">"));
 397         } else {
 398                 for (i = 0; bm; ++i)
 399                         bm >>= 1;
 400                 if (i > 1)
 401                         ND_PRINT((ndo, "<0-%d>", i - 1));
 402                 else
 403                         ND_PRINT((ndo, "<0>"));
 404         }
 405 }
 406
 407 static void
 408 nbp_print(netdissect_options *ndo,
 409           const struct atNBP *np, u_int length, u_short snet,
 410           u_char snode, u_char skt)
 411 {
 412         const struct atNBPtuple *tp =
 413                 (const struct atNBPtuple *)((const u_char *)np + nbpHeaderSize);
 414         uint8_t control;
 415         int i;
 416         const u_char *ep;
 417
 418         if (length < nbpHeaderSize) {
 419                 ND_PRINT((ndo, " truncated-nbp %u", length));
 420                 return;
 421         }
 422
 423         length -= nbpHeaderSize;
 424         if (length < 8) {
 425                 /* must be room for at least one tuple */
 426                 ND_PRINT((ndo, " truncated-nbp %u", length + nbpHeaderSize));
 427                 return;
 428         }
 429         /* ep points to end of available data */
 430         ep = ndo->ndo_snapend;
 431         if ((const u_char *)tp > ep) {
 432                 ND_PRINT((ndo, "%s", tstr));
 433                 return;
 434         }
 435         control = EXTRACT_U_1(np->control);
 436         switch (i = (control & 0xf0)) {
 437
 438         case nbpBrRq:
 439         case nbpLkUp:
 440                 ND_PRINT((ndo, i == nbpLkUp? " nbp-lkup %u:":" nbp-brRq %u:", EXTRACT_U_1(np->id)));
 441                 if ((const u_char *)(tp + 1) > ep) {
 442                         ND_PRINT((ndo, "%s", tstr));
 443                         return;
 444                 }
 445                 (void)nbp_name_print(ndo, tp, ep);
 446                 /*
 447                  * look for anomalies: the spec says there can only
 448                  * be one tuple, the address must match the source
 449                  * address and the enumerator should be zero.
 450                  */
 451                 if ((control & 0xf) != 1)
 452                         ND_PRINT((ndo, " [ntup=%u]", control & 0xf));
 453                 if (EXTRACT_U_1(tp->enumerator))
 454                         ND_PRINT((ndo, " [enum=%u]", EXTRACT_U_1(tp->enumerator)));
 455                 if (EXTRACT_BE_U_2(tp->net) != snet ||
 456                     EXTRACT_U_1(tp->node) != snode ||
 457                     EXTRACT_U_1(tp->skt) != skt)
 458                         ND_PRINT((ndo, " [addr=%s.%d]",
 459                             ataddr_string(ndo, EXTRACT_BE_U_2(tp->net),
 460                                           EXTRACT_U_1(tp->node)),
 461                                           EXTRACT_U_1(tp->skt)));
 462                 break;
 463
 464         case nbpLkUpReply:
 465                 ND_PRINT((ndo, " nbp-reply %u:", EXTRACT_U_1(np->id)));
 466
 467                 /* print each of the tuples in the reply */
 468                 for (i = control & 0xf; --i >= 0 && tp; )
 469                         tp = nbp_tuple_print(ndo, tp, ep, snet, snode, skt);
 470                 break;
 471
 472         default:
 473                 ND_PRINT((ndo, " nbp-0x%x  %u (%u)", control, EXTRACT_U_1(np->id), length));
 474                 break;
 475         }
 476 }
 477
 478 /* print a counted string */
 479 static const char *
 480 print_cstring(netdissect_options *ndo,
 481               const char *cp, const u_char *ep)
 482 {
 483         u_int length;
 484
 485         if (cp >= (const char *)ep) {
 486                 ND_PRINT((ndo, "%s", tstr));
 487                 return (0);
 488         }
 489         length = EXTRACT_U_1(cp);
 490         cp++;
 491
 492         /* Spec says string can be at most 32 bytes long */
 493         if (length > 32) {
 494                 ND_PRINT((ndo, "[len=%u]", length));
 495                 return (0);
 496         }
 497         while (length != 0) {
 498                 if (cp >= (const char *)ep) {
 499                         ND_PRINT((ndo, "%s", tstr));
 500                         return (0);
 501                 }
 502                 ND_PRINT((ndo, "%c", EXTRACT_U_1(cp)));
 503                 cp++;
 504                 length--;
 505         }
 506         return (cp);
 507 }
 508
 509 static const struct atNBPtuple *
 510 nbp_tuple_print(netdissect_options *ndo,
 511                 const struct atNBPtuple *tp, const u_char *ep,
 512                 u_short snet, u_char snode, u_char skt)
 513 {
 514         const struct atNBPtuple *tpn;
 515
 516         if ((const u_char *)(tp + 1) > ep) {
 517                 ND_PRINT((ndo, "%s", tstr));
 518                 return 0;
 519         }
 520         tpn = nbp_name_print(ndo, tp, ep);
 521
 522         /* if the enumerator isn't 1, print it */
 523         if (EXTRACT_U_1(tp->enumerator) != 1)
 524                 ND_PRINT((ndo, "(%u)", EXTRACT_U_1(tp->enumerator)));
 525
 526         /* if the socket doesn't match the src socket, print it */
 527         if (EXTRACT_U_1(tp->skt) != skt)
 528                 ND_PRINT((ndo, " %u", EXTRACT_U_1(tp->skt)));
 529
 530         /* if the address doesn't match the src address, it's an anomaly */
 531         if (EXTRACT_BE_U_2(tp->net) != snet ||
 532             EXTRACT_U_1(tp->node) != snode)
 533                 ND_PRINT((ndo, " [addr=%s]",
 534                     ataddr_string(ndo, EXTRACT_BE_U_2(tp->net), EXTRACT_U_1(tp->node))));
 535
 536         return (tpn);
 537 }
 538
 539 static const struct atNBPtuple *
 540 nbp_name_print(netdissect_options *ndo,
 541                const struct atNBPtuple *tp, const u_char *ep)
 542 {
 543         const char *cp = (const char *)tp + nbpTupleSize;
 544
 545         ND_PRINT((ndo, " "));
 546
 547         /* Object */
 548         ND_PRINT((ndo, "\""));
 549         if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 550                 /* Type */
 551                 ND_PRINT((ndo, ":"));
 552                 if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 553                         /* Zone */
 554                         ND_PRINT((ndo, "@"));
 555                         if ((cp = print_cstring(ndo, cp, ep)) != NULL)
 556                                 ND_PRINT((ndo, "\""));
 557                 }
 558         }
 559         return ((const struct atNBPtuple *)cp);
 560 }
 561
 562
 563 #define HASHNAMESIZE 4096
 564
 565 struct hnamemem {
 566         int addr;
 567         char *name;
 568         struct hnamemem *nxt;
 569 };
 570
 571 static struct hnamemem hnametable[HASHNAMESIZE];
 572
 573 static const char *
 574 ataddr_string(netdissect_options *ndo,
 575               u_short atnet, u_char athost)
 576 {
 577         struct hnamemem *tp, *tp2;
 578         int i = (atnet << 8) | athost;
 579         char nambuf[256+1];
 580         static int first = 1;
 581         FILE *fp;
 582
 583         /*
 584          * if this is the first call, see if there's an AppleTalk
 585          * number to name map file.
 586          */
 587         if (first && (first = 0, !ndo->ndo_nflag)
 588             && (fp = fopen("/etc/atalk.names", "r"))) {
 589                 char line[256];
 590                 int i1, i2;
 591
 592                 while (fgets(line, sizeof(line), fp)) {
 593                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 594                                 continue;
 595                         if (sscanf(line, "%d.%d %256s", &i1, &i2, nambuf) == 3)
 596                                 /* got a hostname. */
 597                                 i2 |= (i1 << 8);
 598                         else if (sscanf(line, "%d %256s", &i1, nambuf) == 2)
 599                                 /* got a net name */
 600                                 i2 = (i1 << 8) | 255;
 601                         else
 602                                 continue;
 603
 604                         for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
 605                              tp->nxt; tp = tp->nxt)
 606                                 ;
 607                         tp->addr = i2;
 608                         tp->nxt = newhnamemem(ndo);
 609                         tp->name = strdup(nambuf);
 610                         if (tp->name == NULL)
 611                                 (*ndo->ndo_error)(ndo,
 612                                                   "ataddr_string: strdup(nambuf)");
 613                 }
 614                 fclose(fp);
 615         }
 616
 617         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 618                 if (tp->addr == i)
 619                         return (tp->name);
 620
 621         /* didn't have the node name -- see if we've got the net name */
 622         i |= 255;
 623         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 624                 if (tp2->addr == i) {
 625                         tp->addr = (atnet << 8) | athost;
 626                         tp->nxt = newhnamemem(ndo);
 627                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%d",
 628                             tp2->name, athost);
 629                         tp->name = strdup(nambuf);
 630                         if (tp->name == NULL)
 631                                 (*ndo->ndo_error)(ndo,
 632                                                   "ataddr_string: strdup(nambuf)");
 633                         return (tp->name);
 634                 }
 635
 636         tp->addr = (atnet << 8) | athost;
 637         tp->nxt = newhnamemem(ndo);
 638         if (athost != 255)
 639                 (void)snprintf(nambuf, sizeof(nambuf), "%d.%d", atnet, athost);
 640         else
 641                 (void)snprintf(nambuf, sizeof(nambuf), "%d", atnet);
 642         tp->name = strdup(nambuf);
 643         if (tp->name == NULL)
 644                 (*ndo->ndo_error)(ndo, "ataddr_string: strdup(nambuf)");
 645
 646         return (tp->name);
 647 }
 648
 649 static const struct tok skt2str[] = {
 650         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 651         { nbpSkt,       "nis" },        /* name info socket */
 652         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 653         { zipSkt,       "zip" },        /* zone info protocol */
 654         { 0,            NULL }
 655 };
 656
 657 static const char *
 658 ddpskt_string(netdissect_options *ndo,
 659               int skt)
 660 {
 661         static char buf[8];
 662
 663         if (ndo->ndo_nflag) {
 664                 (void)snprintf(buf, sizeof(buf), "%d", skt);
 665                 return (buf);
 666         }
 667         return (tok2str(skt2str, "%d", skt));
 668 }