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
  40 static const struct tok type2str[] = {
  41         { ddpRTMP,              "rtmp" },
  42         { ddpRTMPrequest,       "rtmpReq" },
  43         { ddpECHO,              "echo" },
  44         { ddpIP,                "IP" },
  45         { ddpARP,               "ARP" },
  46         { ddpKLAP,              "KLAP" },
  47         { 0,                    NULL }
  48 };
  49
  50 struct aarp {
  51         nd_uint16_t     htype, ptype;
  52         nd_uint8_t      halen, palen;
  53         nd_uint16_t     op;
  54         uint8_t         hsaddr[6];
  55         uint8_t         psaddr[4];
  56         uint8_t         hdaddr[6];
  57         uint8_t         pdaddr[4];
  58 };
  59
  60 static void atp_print(netdissect_options *, const struct atATP *, u_int);
  61 static void atp_bitmap_print(netdissect_options *, u_char);
  62 static void nbp_print(netdissect_options *, const struct atNBP *, u_int, u_short, u_char, u_char);
  63 static const struct atNBPtuple *nbp_tuple_print(netdissect_options *ndo, const struct atNBPtuple *,
  64                                                 const u_char *,
  65                                                 u_short, u_char, u_char);
  66 static const struct atNBPtuple *nbp_name_print(netdissect_options *, const struct atNBPtuple *,
  67                                                const u_char *);
  68 static const char *ataddr_string(netdissect_options *, u_short, u_char);
  69 static void ddp_print(netdissect_options *, const u_char *, u_int, u_int, u_short, u_char, u_char);
  70 static const char *ddpskt_string(netdissect_options *, u_int);
  71
  72 /*
  73  * Print LLAP packets received on a physical LocalTalk interface.
  74  */
  75 u_int
  76 ltalk_if_print(netdissect_options *ndo,
  77                const struct pcap_pkthdr *h, const u_char *p)
  78 {
  79         u_int hdrlen;
  80
  81         ndo->ndo_protocol = "ltalk_if";
  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         ndo->ndo_protocol = "llap";
 104         if (length < sizeof(*lp)) {
 105                 ND_PRINT(" [|llap %u]", length);
 106                 return (length);
 107         }
 108         if (!ND_TTEST_LEN(bp, sizeof(*lp))) {
 109                 nd_print_trunc(ndo);
 110                 return (0);     /* cut short by the snapshot length */
 111         }
 112         lp = (const struct LAP *)bp;
 113         bp += sizeof(*lp);
 114         length -= sizeof(*lp);
 115         hdrlen = sizeof(*lp);
 116         switch (EXTRACT_U_1(lp->type)) {
 117
 118         case lapShortDDP:
 119                 if (length < ddpSSize) {
 120                         ND_PRINT(" [|sddp %u]", length);
 121                         return (length);
 122                 }
 123                 if (!ND_TTEST_LEN(bp, ddpSSize)) {
 124                         ND_PRINT(" [|sddp]");
 125                         return (0);     /* cut short by the snapshot length */
 126                 }
 127                 sdp = (const struct atShortDDP *)bp;
 128                 ND_PRINT("%s.%s",
 129                     ataddr_string(ndo, 0, EXTRACT_U_1(lp->src)), ddpskt_string(ndo, EXTRACT_U_1(sdp->srcSkt)));
 130                 ND_PRINT(" > %s.%s:",
 131                     ataddr_string(ndo, 0, EXTRACT_U_1(lp->dst)), ddpskt_string(ndo, EXTRACT_U_1(sdp->dstSkt)));
 132                 bp += ddpSSize;
 133                 length -= ddpSSize;
 134                 hdrlen += ddpSSize;
 135                 ddp_print(ndo, bp, length, EXTRACT_U_1(sdp->type), 0, EXTRACT_U_1(lp->src), EXTRACT_U_1(sdp->srcSkt));
 136                 break;
 137
 138         case lapDDP:
 139                 if (length < ddpSize) {
 140                         ND_PRINT(" [|ddp %u]", length);
 141                         return (length);
 142                 }
 143                 if (!ND_TTEST_LEN(bp, ddpSize)) {
 144                         ND_PRINT(" [|ddp]");
 145                         return (0);     /* cut short by the snapshot length */
 146                 }
 147                 dp = (const struct atDDP *)bp;
 148                 snet = EXTRACT_BE_U_2(dp->srcNet);
 149                 ND_PRINT("%s.%s", ataddr_string(ndo, snet, EXTRACT_U_1(dp->srcNode)),
 150                     ddpskt_string(ndo, EXTRACT_U_1(dp->srcSkt)));
 151                 ND_PRINT(" > %s.%s:",
 152                     ataddr_string(ndo, EXTRACT_BE_U_2(dp->dstNet), EXTRACT_U_1(dp->dstNode)),
 153                     ddpskt_string(ndo, EXTRACT_U_1(dp->dstSkt)));
 154                 bp += ddpSize;
 155                 length -= ddpSize;
 156                 hdrlen += ddpSize;
 157                 ddp_print(ndo, bp, length, EXTRACT_U_1(dp->type), snet, EXTRACT_U_1(dp->srcNode), EXTRACT_U_1(dp->srcSkt));
 158                 break;
 159
 160 #ifdef notdef
 161         case lapKLAP:
 162                 klap_print(bp, length);
 163                 break;
 164 #endif
 165
 166         default:
 167                 ND_PRINT("%u > %u at-lap#%u %u",
 168                     EXTRACT_U_1(lp->src), EXTRACT_U_1(lp->dst), EXTRACT_U_1(lp->type), length);
 169                 break;
 170         }
 171         return (hdrlen);
 172 }
 173
 174 /*
 175  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 176  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 177  * packets in them).
 178  */
 179 void
 180 atalk_print(netdissect_options *ndo,
 181             const u_char *bp, u_int length)
 182 {
 183         const struct atDDP *dp;
 184         u_short snet;
 185
 186         ndo->ndo_protocol = "atalk";
 187         if(!ndo->ndo_eflag)
 188             ND_PRINT("AT ");
 189
 190         if (length < ddpSize) {
 191                 ND_PRINT(" [|ddp %u]", length);
 192                 return;
 193         }
 194         if (!ND_TTEST_LEN(bp, ddpSize)) {
 195                 ND_PRINT(" [|ddp]");
 196                 return;
 197         }
 198         dp = (const struct atDDP *)bp;
 199         snet = EXTRACT_BE_U_2(dp->srcNet);
 200         ND_PRINT("%s.%s", ataddr_string(ndo, snet, EXTRACT_U_1(dp->srcNode)),
 201                ddpskt_string(ndo, EXTRACT_U_1(dp->srcSkt)));
 202         ND_PRINT(" > %s.%s: ",
 203                ataddr_string(ndo, EXTRACT_BE_U_2(dp->dstNet), EXTRACT_U_1(dp->dstNode)),
 204                ddpskt_string(ndo, EXTRACT_U_1(dp->dstSkt)));
 205         bp += ddpSize;
 206         length -= ddpSize;
 207         ddp_print(ndo, bp, length, EXTRACT_U_1(dp->type), snet, EXTRACT_U_1(dp->srcNode), EXTRACT_U_1(dp->srcSkt));
 208 }
 209
 210 /* XXX should probably pass in the snap header and do checks like arp_print() */
 211 void
 212 aarp_print(netdissect_options *ndo,
 213            const u_char *bp, u_int length)
 214 {
 215         const struct aarp *ap;
 216
 217 #define AT(member) ataddr_string(ndo, (ap->member[1]<<8)|ap->member[2],ap->member[3])
 218
 219         ndo->ndo_protocol = "aarp";
 220         ND_PRINT("aarp ");
 221         ap = (const struct aarp *)bp;
 222         if (!ND_TTEST_SIZE(ap)) {
 223                 /* Just bail if we don't have the whole chunk. */
 224                 nd_print_trunc(ndo);
 225                 return;
 226         }
 227         if (length < sizeof(*ap)) {
 228                 ND_PRINT(" [|aarp %u]", length);
 229                 return;
 230         }
 231         if (EXTRACT_BE_U_2(ap->htype) == 1 &&
 232             EXTRACT_BE_U_2(ap->ptype) == ETHERTYPE_ATALK &&
 233             EXTRACT_U_1(ap->halen) == 6 && EXTRACT_U_1(ap->palen) == 4 )
 234                 switch (EXTRACT_BE_U_2(ap->op)) {
 235
 236                 case 1:                         /* request */
 237                         ND_PRINT("who-has %s tell %s", AT(pdaddr), AT(psaddr));
 238                         return;
 239
 240                 case 2:                         /* response */
 241                         ND_PRINT("reply %s is-at %s", AT(psaddr), etheraddr_string(ndo, ap->hsaddr));
 242                         return;
 243
 244                 case 3:                         /* probe (oy!) */
 245                         ND_PRINT("probe %s tell %s", AT(pdaddr), AT(psaddr));
 246                         return;
 247                 }
 248         ND_PRINT("len %u op %u htype %u ptype %#x halen %u palen %u",
 249             length, EXTRACT_BE_U_2(ap->op), EXTRACT_BE_U_2(ap->htype),
 250             EXTRACT_BE_U_2(ap->ptype), EXTRACT_U_1(ap->halen), EXTRACT_U_1(ap->palen));
 251 }
 252
 253 /*
 254  * Print AppleTalk Datagram Delivery Protocol packets.
 255  */
 256 static void
 257 ddp_print(netdissect_options *ndo,
 258           const u_char *bp, u_int length, u_int t,
 259           u_short snet, u_char snode, u_char skt)
 260 {
 261
 262         switch (t) {
 263
 264         case ddpNBP:
 265                 nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
 266                 break;
 267
 268         case ddpATP:
 269                 atp_print(ndo, (const struct atATP *)bp, length);
 270                 break;
 271
 272         case ddpEIGRP:
 273                 eigrp_print(ndo, bp, length);
 274                 break;
 275
 276         default:
 277                 ND_PRINT(" at-%s %u", tok2str(type2str, NULL, t), length);
 278                 break;
 279         }
 280 }
 281
 282 static void
 283 atp_print(netdissect_options *ndo,
 284           const struct atATP *ap, u_int length)
 285 {
 286         uint8_t control;
 287         uint32_t data;
 288
 289         if ((const u_char *)(ap + 1) > ndo->ndo_snapend) {
 290                 /* Just bail if we don't have the whole chunk. */
 291                 nd_print_trunc(ndo);
 292                 return;
 293         }
 294         if (length < sizeof(*ap)) {
 295                 ND_PRINT(" [|atp %u]", length);
 296                 return;
 297         }
 298         length -= sizeof(*ap);
 299         control = EXTRACT_U_1(ap->control);
 300         switch (control & 0xc0) {
 301
 302         case atpReqCode:
 303                 ND_PRINT(" atp-req%s %u",
 304                              control & atpXO? " " : "*",
 305                              EXTRACT_BE_U_2(ap->transID));
 306
 307                 atp_bitmap_print(ndo, EXTRACT_U_1(ap->bitmap));
 308
 309                 if (length != 0)
 310                         ND_PRINT(" [len=%u]", length);
 311
 312                 switch (control & (atpEOM|atpSTS)) {
 313                 case atpEOM:
 314                         ND_PRINT(" [EOM]");
 315                         break;
 316                 case atpSTS:
 317                         ND_PRINT(" [STS]");
 318                         break;
 319                 case atpEOM|atpSTS:
 320                         ND_PRINT(" [EOM,STS]");
 321                         break;
 322                 }
 323                 break;
 324
 325         case atpRspCode:
 326                 ND_PRINT(" atp-resp%s%u:%u (%u)",
 327                              control & atpEOM? "*" : " ",
 328                              EXTRACT_BE_U_2(ap->transID), EXTRACT_U_1(ap->bitmap), length);
 329                 switch (control & (atpXO|atpSTS)) {
 330                 case atpXO:
 331                         ND_PRINT(" [XO]");
 332                         break;
 333                 case atpSTS:
 334                         ND_PRINT(" [STS]");
 335                         break;
 336                 case atpXO|atpSTS:
 337                         ND_PRINT(" [XO,STS]");
 338                         break;
 339                 }
 340                 break;
 341
 342         case atpRelCode:
 343                 ND_PRINT(" atp-rel  %u", EXTRACT_BE_U_2(ap->transID));
 344
 345                 atp_bitmap_print(ndo, EXTRACT_U_1(ap->bitmap));
 346
 347                 /* length should be zero */
 348                 if (length)
 349                         ND_PRINT(" [len=%u]", length);
 350
 351                 /* there shouldn't be any control flags */
 352                 if (control & (atpXO|atpEOM|atpSTS)) {
 353                         char c = '[';
 354                         if (control & atpXO) {
 355                                 ND_PRINT("%cXO", c);
 356                                 c = ',';
 357                         }
 358                         if (control & atpEOM) {
 359                                 ND_PRINT("%cEOM", c);
 360                                 c = ',';
 361                         }
 362                         if (control & atpSTS) {
 363                                 ND_PRINT("%cSTS", c);
 364                         }
 365                         ND_PRINT("]");
 366                 }
 367                 break;
 368
 369         default:
 370                 ND_PRINT(" atp-0x%x  %u (%u)", control,
 371                              EXTRACT_BE_U_2(ap->transID), length);
 372                 break;
 373         }
 374         data = EXTRACT_BE_U_4(ap->userData);
 375         if (data != 0)
 376                 ND_PRINT(" 0x%x", data);
 377 }
 378
 379 static void
 380 atp_bitmap_print(netdissect_options *ndo,
 381                  u_char bm)
 382 {
 383         u_int i;
 384
 385         /*
 386          * The '& 0xff' below is needed for compilers that want to sign
 387          * extend a u_char, which is the case with the Ultrix compiler.
 388          * (gcc is smart enough to eliminate it, at least on the Sparc).
 389          */
 390         if ((bm + 1) & (bm & 0xff)) {
 391                 char c = '<';
 392                 for (i = 0; bm; ++i) {
 393                         if (bm & 1) {
 394                                 ND_PRINT("%c%u", c, i);
 395                                 c = ',';
 396                         }
 397                         bm >>= 1;
 398                 }
 399                 ND_PRINT(">");
 400         } else {
 401                 for (i = 0; bm; ++i)
 402                         bm >>= 1;
 403                 if (i > 1)
 404                         ND_PRINT("<0-%u>", i - 1);
 405                 else
 406                         ND_PRINT("<0>");
 407         }
 408 }
 409
 410 static void
 411 nbp_print(netdissect_options *ndo,
 412           const struct atNBP *np, u_int length, u_short snet,
 413           u_char snode, u_char skt)
 414 {
 415         const struct atNBPtuple *tp =
 416                 (const struct atNBPtuple *)((const u_char *)np + nbpHeaderSize);
 417         uint8_t control;
 418         u_int i;
 419         const u_char *ep;
 420
 421         if (length < nbpHeaderSize) {
 422                 ND_PRINT(" truncated-nbp %u", length);
 423                 return;
 424         }
 425
 426         length -= nbpHeaderSize;
 427         if (length < 8) {
 428                 /* must be room for at least one tuple */
 429                 ND_PRINT(" truncated-nbp %u", length + nbpHeaderSize);
 430                 return;
 431         }
 432         /* ep points to end of available data */
 433         ep = ndo->ndo_snapend;
 434         if ((const u_char *)tp > ep) {
 435                 nd_print_trunc(ndo);
 436                 return;
 437         }
 438         control = EXTRACT_U_1(np->control);
 439         switch (i = (control & 0xf0)) {
 440
 441         case nbpBrRq:
 442         case nbpLkUp:
 443                 ND_PRINT(i == nbpLkUp? " nbp-lkup %u:":" nbp-brRq %u:", EXTRACT_U_1(np->id));
 444                 if ((const u_char *)(tp + 1) > ep) {
 445                         nd_print_trunc(ndo);
 446                         return;
 447                 }
 448                 (void)nbp_name_print(ndo, tp, ep);
 449                 /*
 450                  * look for anomalies: the spec says there can only
 451                  * be one tuple, the address must match the source
 452                  * address and the enumerator should be zero.
 453                  */
 454                 if ((control & 0xf) != 1)
 455                         ND_PRINT(" [ntup=%u]", control & 0xf);
 456                 if (EXTRACT_U_1(tp->enumerator))
 457                         ND_PRINT(" [enum=%u]", EXTRACT_U_1(tp->enumerator));
 458                 if (EXTRACT_BE_U_2(tp->net) != snet ||
 459                     EXTRACT_U_1(tp->node) != snode ||
 460                     EXTRACT_U_1(tp->skt) != skt)
 461                         ND_PRINT(" [addr=%s.%u]",
 462                             ataddr_string(ndo, EXTRACT_BE_U_2(tp->net),
 463                                           EXTRACT_U_1(tp->node)),
 464                             EXTRACT_U_1(tp->skt));
 465                 break;
 466
 467         case nbpLkUpReply:
 468                 ND_PRINT(" nbp-reply %u:", EXTRACT_U_1(np->id));
 469
 470                 /* print each of the tuples in the reply */
 471                 for (i = control & 0xf; i != 0 && tp; i--)
 472                         tp = nbp_tuple_print(ndo, tp, ep, snet, snode, skt);
 473                 break;
 474
 475         default:
 476                 ND_PRINT(" nbp-0x%x  %u (%u)", control, EXTRACT_U_1(np->id), length);
 477                 break;
 478         }
 479 }
 480
 481 /* print a counted string */
 482 static const u_char *
 483 print_cstring(netdissect_options *ndo,
 484               const u_char *cp, const u_char *ep)
 485 {
 486         u_int length;
 487
 488         if (cp >= ep) {
 489                 nd_print_trunc(ndo);
 490                 return (0);
 491         }
 492         length = EXTRACT_U_1(cp);
 493         cp++;
 494
 495         /* Spec says string can be at most 32 bytes long */
 496         if (length > 32) {
 497                 ND_PRINT("[len=%u]", length);
 498                 return (0);
 499         }
 500         while (length != 0) {
 501                 if (cp >= ep) {
 502                         nd_print_trunc(ndo);
 503                         return (0);
 504                 }
 505                 fn_print_char(ndo, EXTRACT_U_1(cp));
 506                 cp++;
 507                 length--;
 508         }
 509         return (cp);
 510 }
 511
 512 static const struct atNBPtuple *
 513 nbp_tuple_print(netdissect_options *ndo,
 514                 const struct atNBPtuple *tp, const u_char *ep,
 515                 u_short snet, u_char snode, u_char skt)
 516 {
 517         const struct atNBPtuple *tpn;
 518
 519         if ((const u_char *)(tp + 1) > ep) {
 520                 nd_print_trunc(ndo);
 521                 return 0;
 522         }
 523         tpn = nbp_name_print(ndo, tp, ep);
 524
 525         /* if the enumerator isn't 1, print it */
 526         if (EXTRACT_U_1(tp->enumerator) != 1)
 527                 ND_PRINT("(%u)", EXTRACT_U_1(tp->enumerator));
 528
 529         /* if the socket doesn't match the src socket, print it */
 530         if (EXTRACT_U_1(tp->skt) != skt)
 531                 ND_PRINT(" %u", EXTRACT_U_1(tp->skt));
 532
 533         /* if the address doesn't match the src address, it's an anomaly */
 534         if (EXTRACT_BE_U_2(tp->net) != snet ||
 535             EXTRACT_U_1(tp->node) != snode)
 536                 ND_PRINT(" [addr=%s]",
 537                     ataddr_string(ndo, EXTRACT_BE_U_2(tp->net), EXTRACT_U_1(tp->node)));
 538
 539         return (tpn);
 540 }
 541
 542 static const struct atNBPtuple *
 543 nbp_name_print(netdissect_options *ndo,
 544                const struct atNBPtuple *tp, const u_char *ep)
 545 {
 546         const u_char *cp = (const u_char *)tp + nbpTupleSize;
 547
 548         ND_PRINT(" ");
 549
 550         /* Object */
 551         ND_PRINT("\"");
 552         if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 553                 /* Type */
 554                 ND_PRINT(":");
 555                 if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 556                         /* Zone */
 557                         ND_PRINT("@");
 558                         if ((cp = print_cstring(ndo, cp, ep)) != NULL)
 559                                 ND_PRINT("\"");
 560                 }
 561         }
 562         return ((const struct atNBPtuple *)cp);
 563 }
 564
 565
 566 #define HASHNAMESIZE 4096
 567
 568 struct hnamemem {
 569         u_int addr;
 570         char *name;
 571         struct hnamemem *nxt;
 572 };
 573
 574 static struct hnamemem hnametable[HASHNAMESIZE];
 575
 576 static const char *
 577 ataddr_string(netdissect_options *ndo,
 578               u_short atnet, u_char athost)
 579 {
 580         struct hnamemem *tp, *tp2;
 581         u_int i = (atnet << 8) | athost;
 582         char nambuf[256+1];
 583         static int first = 1;
 584         FILE *fp;
 585
 586         /*
 587          * Are we doing address to name resolution?
 588          */
 589         if (!ndo->ndo_nflag) {
 590                 /*
 591                  * Yes.  Have we tried to open and read an AppleTalk
 592                  * number to name map file?
 593                  */
 594                 if (!first) {
 595                         /*
 596                          * No; try to do so.
 597                          */
 598                         first = 0;
 599                         fp = fopen("/etc/atalk.names", "r");
 600                         if (fp != NULL) {
 601                                 char line[256];
 602                                 u_int i1, i2;
 603
 604                                 while (fgets(line, sizeof(line), fp)) {
 605                                         if (line[0] == '\n' || line[0] == 0 ||
 606                                             line[0] == '#')
 607                                                 continue;
 608                                         if (sscanf(line, "%u.%u %256s", &i1,
 609                                             &i2, nambuf) == 3)
 610                                                 /* got a hostname. */
 611                                                 i2 |= (i1 << 8);
 612                                         else if (sscanf(line, "%u %256s", &i1,
 613                                             nambuf) == 2)
 614                                                 /* got a net name */
 615                                                 i2 = (i1 << 8) | 255;
 616                                         else
 617                                                 continue;
 618
 619                                         for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
 620                                              tp->nxt; tp = tp->nxt)
 621                                                 ;
 622                                         tp->addr = i2;
 623                                         tp->nxt = newhnamemem(ndo);
 624                                         tp->name = strdup(nambuf);
 625                                         if (tp->name == NULL)
 626                                                 (*ndo->ndo_error)(ndo,
 627                                                     S_ERR_ND_MEM_ALLOC,
 628                                                     "ataddr_string: strdup(nambuf)");
 629                                 }
 630                                 fclose(fp);
 631                         }
 632                 }
 633         }
 634
 635         /*
 636          * Now try to look up the address in the table.
 637          */
 638         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 639                 if (tp->addr == i)
 640                         return (tp->name);
 641
 642         /* didn't have the node name -- see if we've got the net name */
 643         i |= 255;
 644         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 645                 if (tp2->addr == i) {
 646                         tp->addr = (atnet << 8) | athost;
 647                         tp->nxt = newhnamemem(ndo);
 648                         (void)nd_snprintf(nambuf, sizeof(nambuf), "%s.%u",
 649                             tp2->name, athost);
 650                         tp->name = strdup(nambuf);
 651                         if (tp->name == NULL)
 652                                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 653                                         "ataddr_string: strdup(nambuf)");
 654                         return (tp->name);
 655                 }
 656
 657         tp->addr = (atnet << 8) | athost;
 658         tp->nxt = newhnamemem(ndo);
 659         if (athost != 255)
 660                 (void)nd_snprintf(nambuf, sizeof(nambuf), "%u.%u", atnet, athost);
 661         else
 662                 (void)nd_snprintf(nambuf, sizeof(nambuf), "%u", atnet);
 663         tp->name = strdup(nambuf);
 664         if (tp->name == NULL)
 665                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 666                                   "ataddr_string: strdup(nambuf)");
 667
 668         return (tp->name);
 669 }
 670
 671 static const struct tok skt2str[] = {
 672         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 673         { nbpSkt,       "nis" },        /* name info socket */
 674         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 675         { zipSkt,       "zip" },        /* zone info protocol */
 676         { 0,            NULL }
 677 };
 678
 679 static const char *
 680 ddpskt_string(netdissect_options *ndo,
 681               u_int skt)
 682 {
 683         static char buf[8];
 684
 685         if (ndo->ndo_nflag) {
 686                 (void)nd_snprintf(buf, sizeof(buf), "%u", skt);
 687                 return (buf);
 688         }
 689         return (tok2str(skt2str, "%u", skt));
 690 }