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, u_int, u_short, u_char, u_char);
  71 static const char *ddpskt_string(netdissect_options *, u_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         ndo->ndo_protocol = "ltalk_if";
  83         hdrlen = llap_print(ndo, p, h->len);
  84         if (hdrlen == 0) {
  85                 /* Cut short by the snapshot length. */
  86                 return (h->caplen);
  87         }
  88         return (hdrlen);
  89 }
  90
  91 /*
  92  * Print AppleTalk LLAP packets.
  93  */
  94 u_int
  95 llap_print(netdissect_options *ndo,
  96            const u_char *bp, u_int length)
  97 {
  98         const struct LAP *lp;
  99         const struct atDDP *dp;
 100         const struct atShortDDP *sdp;
 101         u_short snet;
 102         u_int hdrlen;
 103
 104         ndo->ndo_protocol = "llap";
 105         if (length < sizeof(*lp)) {
 106                 ND_PRINT(" [|llap %u]", length);
 107                 return (length);
 108         }
 109         if (!ND_TTEST_LEN(bp, sizeof(*lp))) {
 110                 ND_PRINT(" [|llap]");
 111                 return (0);     /* cut short by the snapshot length */
 112         }
 113         lp = (const struct LAP *)bp;
 114         bp += sizeof(*lp);
 115         length -= sizeof(*lp);
 116         hdrlen = sizeof(*lp);
 117         switch (EXTRACT_U_1(lp->type)) {
 118
 119         case lapShortDDP:
 120                 if (length < ddpSSize) {
 121                         ND_PRINT(" [|sddp %u]", length);
 122                         return (length);
 123                 }
 124                 if (!ND_TTEST_LEN(bp, ddpSSize)) {
 125                         ND_PRINT(" [|sddp]");
 126                         return (0);     /* cut short by the snapshot length */
 127                 }
 128                 sdp = (const struct atShortDDP *)bp;
 129                 ND_PRINT("%s.%s",
 130                     ataddr_string(ndo, 0, EXTRACT_U_1(lp->src)), ddpskt_string(ndo, EXTRACT_U_1(sdp->srcSkt)));
 131                 ND_PRINT(" > %s.%s:",
 132                     ataddr_string(ndo, 0, EXTRACT_U_1(lp->dst)), ddpskt_string(ndo, EXTRACT_U_1(sdp->dstSkt)));
 133                 bp += ddpSSize;
 134                 length -= ddpSSize;
 135                 hdrlen += ddpSSize;
 136                 ddp_print(ndo, bp, length, EXTRACT_U_1(sdp->type), 0, EXTRACT_U_1(lp->src), EXTRACT_U_1(sdp->srcSkt));
 137                 break;
 138
 139         case lapDDP:
 140                 if (length < ddpSize) {
 141                         ND_PRINT(" [|ddp %u]", length);
 142                         return (length);
 143                 }
 144                 if (!ND_TTEST_LEN(bp, ddpSize)) {
 145                         ND_PRINT(" [|ddp]");
 146                         return (0);     /* cut short by the snapshot length */
 147                 }
 148                 dp = (const struct atDDP *)bp;
 149                 snet = EXTRACT_BE_U_2(dp->srcNet);
 150                 ND_PRINT("%s.%s", ataddr_string(ndo, snet, EXTRACT_U_1(dp->srcNode)),
 151                     ddpskt_string(ndo, EXTRACT_U_1(dp->srcSkt)));
 152                 ND_PRINT(" > %s.%s:",
 153                     ataddr_string(ndo, EXTRACT_BE_U_2(dp->dstNet), EXTRACT_U_1(dp->dstNode)),
 154                     ddpskt_string(ndo, EXTRACT_U_1(dp->dstSkt)));
 155                 bp += ddpSize;
 156                 length -= ddpSize;
 157                 hdrlen += ddpSize;
 158                 ddp_print(ndo, bp, length, EXTRACT_U_1(dp->type), snet, EXTRACT_U_1(dp->srcNode), EXTRACT_U_1(dp->srcSkt));
 159                 break;
 160
 161 #ifdef notdef
 162         case lapKLAP:
 163                 klap_print(bp, length);
 164                 break;
 165 #endif
 166
 167         default:
 168                 ND_PRINT("%u > %u at-lap#%u %u",
 169                     EXTRACT_U_1(lp->src), EXTRACT_U_1(lp->dst), EXTRACT_U_1(lp->type), length);
 170                 break;
 171         }
 172         return (hdrlen);
 173 }
 174
 175 /*
 176  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 177  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 178  * packets in them).
 179  */
 180 void
 181 atalk_print(netdissect_options *ndo,
 182             const u_char *bp, u_int length)
 183 {
 184         const struct atDDP *dp;
 185         u_short snet;
 186
 187         ndo->ndo_protocol = "atalk";
 188         if(!ndo->ndo_eflag)
 189             ND_PRINT("AT ");
 190
 191         if (length < ddpSize) {
 192                 ND_PRINT(" [|ddp %u]", length);
 193                 return;
 194         }
 195         if (!ND_TTEST_LEN(bp, ddpSize)) {
 196                 ND_PRINT(" [|ddp]");
 197                 return;
 198         }
 199         dp = (const struct atDDP *)bp;
 200         snet = EXTRACT_BE_U_2(dp->srcNet);
 201         ND_PRINT("%s.%s", ataddr_string(ndo, snet, EXTRACT_U_1(dp->srcNode)),
 202                ddpskt_string(ndo, EXTRACT_U_1(dp->srcSkt)));
 203         ND_PRINT(" > %s.%s: ",
 204                ataddr_string(ndo, EXTRACT_BE_U_2(dp->dstNet), EXTRACT_U_1(dp->dstNode)),
 205                ddpskt_string(ndo, EXTRACT_U_1(dp->dstSkt)));
 206         bp += ddpSize;
 207         length -= ddpSize;
 208         ddp_print(ndo, bp, length, EXTRACT_U_1(dp->type), snet, EXTRACT_U_1(dp->srcNode), EXTRACT_U_1(dp->srcSkt));
 209 }
 210
 211 /* XXX should probably pass in the snap header and do checks like arp_print() */
 212 void
 213 aarp_print(netdissect_options *ndo,
 214            const u_char *bp, u_int length)
 215 {
 216         const struct aarp *ap;
 217
 218 #define AT(member) ataddr_string(ndo, (ap->member[1]<<8)|ap->member[2],ap->member[3])
 219
 220         ndo->ndo_protocol = "aarp";
 221         ND_PRINT("aarp ");
 222         ap = (const struct aarp *)bp;
 223         if (!ND_TTEST_SIZE(ap)) {
 224                 /* Just bail if we don't have the whole chunk. */
 225                 ND_PRINT(" [|aarp]");
 226                 return;
 227         }
 228         if (length < sizeof(*ap)) {
 229                 ND_PRINT(" [|aarp %u]", length);
 230                 return;
 231         }
 232         if (EXTRACT_BE_U_2(ap->htype) == 1 &&
 233             EXTRACT_BE_U_2(ap->ptype) == ETHERTYPE_ATALK &&
 234             EXTRACT_U_1(ap->halen) == 6 && EXTRACT_U_1(ap->palen) == 4 )
 235                 switch (EXTRACT_BE_U_2(ap->op)) {
 236
 237                 case 1:                         /* request */
 238                         ND_PRINT("who-has %s tell %s", AT(pdaddr), AT(psaddr));
 239                         return;
 240
 241                 case 2:                         /* response */
 242                         ND_PRINT("reply %s is-at %s", AT(psaddr), etheraddr_string(ndo, ap->hsaddr));
 243                         return;
 244
 245                 case 3:                         /* probe (oy!) */
 246                         ND_PRINT("probe %s tell %s", AT(pdaddr), AT(psaddr));
 247                         return;
 248                 }
 249         ND_PRINT("len %u op %u htype %u ptype %#x halen %u palen %u",
 250             length, EXTRACT_BE_U_2(ap->op), EXTRACT_BE_U_2(ap->htype),
 251             EXTRACT_BE_U_2(ap->ptype), EXTRACT_U_1(ap->halen), EXTRACT_U_1(ap->palen));
 252 }
 253
 254 /*
 255  * Print AppleTalk Datagram Delivery Protocol packets.
 256  */
 257 static void
 258 ddp_print(netdissect_options *ndo,
 259           const u_char *bp, u_int length, u_int t,
 260           u_short snet, u_char snode, u_char skt)
 261 {
 262
 263         switch (t) {
 264
 265         case ddpNBP:
 266                 nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
 267                 break;
 268
 269         case ddpATP:
 270                 atp_print(ndo, (const struct atATP *)bp, length);
 271                 break;
 272
 273         case ddpEIGRP:
 274                 eigrp_print(ndo, bp, length);
 275                 break;
 276
 277         default:
 278                 ND_PRINT(" at-%s %u", tok2str(type2str, NULL, t), length);
 279                 break;
 280         }
 281 }
 282
 283 static void
 284 atp_print(netdissect_options *ndo,
 285           const struct atATP *ap, u_int length)
 286 {
 287         uint8_t control;
 288         uint32_t data;
 289
 290         if ((const u_char *)(ap + 1) > ndo->ndo_snapend) {
 291                 /* Just bail if we don't have the whole chunk. */
 292                 ND_PRINT("%s", tstr);
 293                 return;
 294         }
 295         if (length < sizeof(*ap)) {
 296                 ND_PRINT(" [|atp %u]", length);
 297                 return;
 298         }
 299         length -= sizeof(*ap);
 300         control = EXTRACT_U_1(ap->control);
 301         switch (control & 0xc0) {
 302
 303         case atpReqCode:
 304                 ND_PRINT(" atp-req%s %u",
 305                              control & atpXO? " " : "*",
 306                              EXTRACT_BE_U_2(ap->transID));
 307
 308                 atp_bitmap_print(ndo, EXTRACT_U_1(ap->bitmap));
 309
 310                 if (length != 0)
 311                         ND_PRINT(" [len=%u]", length);
 312
 313                 switch (control & (atpEOM|atpSTS)) {
 314                 case atpEOM:
 315                         ND_PRINT(" [EOM]");
 316                         break;
 317                 case atpSTS:
 318                         ND_PRINT(" [STS]");
 319                         break;
 320                 case atpEOM|atpSTS:
 321                         ND_PRINT(" [EOM,STS]");
 322                         break;
 323                 }
 324                 break;
 325
 326         case atpRspCode:
 327                 ND_PRINT(" atp-resp%s%u:%u (%u)",
 328                              control & atpEOM? "*" : " ",
 329                              EXTRACT_BE_U_2(ap->transID), EXTRACT_U_1(ap->bitmap), length);
 330                 switch (control & (atpXO|atpSTS)) {
 331                 case atpXO:
 332                         ND_PRINT(" [XO]");
 333                         break;
 334                 case atpSTS:
 335                         ND_PRINT(" [STS]");
 336                         break;
 337                 case atpXO|atpSTS:
 338                         ND_PRINT(" [XO,STS]");
 339                         break;
 340                 }
 341                 break;
 342
 343         case atpRelCode:
 344                 ND_PRINT(" atp-rel  %u", EXTRACT_BE_U_2(ap->transID));
 345
 346                 atp_bitmap_print(ndo, EXTRACT_U_1(ap->bitmap));
 347
 348                 /* length should be zero */
 349                 if (length)
 350                         ND_PRINT(" [len=%u]", length);
 351
 352                 /* there shouldn't be any control flags */
 353                 if (control & (atpXO|atpEOM|atpSTS)) {
 354                         char c = '[';
 355                         if (control & atpXO) {
 356                                 ND_PRINT("%cXO", c);
 357                                 c = ',';
 358                         }
 359                         if (control & atpEOM) {
 360                                 ND_PRINT("%cEOM", c);
 361                                 c = ',';
 362                         }
 363                         if (control & atpSTS) {
 364                                 ND_PRINT("%cSTS", c);
 365                         }
 366                         ND_PRINT("]");
 367                 }
 368                 break;
 369
 370         default:
 371                 ND_PRINT(" atp-0x%x  %u (%u)", control,
 372                              EXTRACT_BE_U_2(ap->transID), length);
 373                 break;
 374         }
 375         data = EXTRACT_BE_U_4(ap->userData);
 376         if (data != 0)
 377                 ND_PRINT(" 0x%x", data);
 378 }
 379
 380 static void
 381 atp_bitmap_print(netdissect_options *ndo,
 382                  u_char bm)
 383 {
 384         u_int i;
 385
 386         /*
 387          * The '& 0xff' below is needed for compilers that want to sign
 388          * extend a u_char, which is the case with the Ultrix compiler.
 389          * (gcc is smart enough to eliminate it, at least on the Sparc).
 390          */
 391         if ((bm + 1) & (bm & 0xff)) {
 392                 char c = '<';
 393                 for (i = 0; bm; ++i) {
 394                         if (bm & 1) {
 395                                 ND_PRINT("%c%u", c, i);
 396                                 c = ',';
 397                         }
 398                         bm >>= 1;
 399                 }
 400                 ND_PRINT(">");
 401         } else {
 402                 for (i = 0; bm; ++i)
 403                         bm >>= 1;
 404                 if (i > 1)
 405                         ND_PRINT("<0-%u>", i - 1);
 406                 else
 407                         ND_PRINT("<0>");
 408         }
 409 }
 410
 411 static void
 412 nbp_print(netdissect_options *ndo,
 413           const struct atNBP *np, u_int length, u_short snet,
 414           u_char snode, u_char skt)
 415 {
 416         const struct atNBPtuple *tp =
 417                 (const struct atNBPtuple *)((const u_char *)np + nbpHeaderSize);
 418         uint8_t control;
 419         u_int i;
 420         const u_char *ep;
 421
 422         if (length < nbpHeaderSize) {
 423                 ND_PRINT(" truncated-nbp %u", length);
 424                 return;
 425         }
 426
 427         length -= nbpHeaderSize;
 428         if (length < 8) {
 429                 /* must be room for at least one tuple */
 430                 ND_PRINT(" truncated-nbp %u", length + nbpHeaderSize);
 431                 return;
 432         }
 433         /* ep points to end of available data */
 434         ep = ndo->ndo_snapend;
 435         if ((const u_char *)tp > ep) {
 436                 ND_PRINT("%s", tstr);
 437                 return;
 438         }
 439         control = EXTRACT_U_1(np->control);
 440         switch (i = (control & 0xf0)) {
 441
 442         case nbpBrRq:
 443         case nbpLkUp:
 444                 ND_PRINT(i == nbpLkUp? " nbp-lkup %u:":" nbp-brRq %u:", EXTRACT_U_1(np->id));
 445                 if ((const u_char *)(tp + 1) > ep) {
 446                         ND_PRINT("%s", tstr);
 447                         return;
 448                 }
 449                 (void)nbp_name_print(ndo, tp, ep);
 450                 /*
 451                  * look for anomalies: the spec says there can only
 452                  * be one tuple, the address must match the source
 453                  * address and the enumerator should be zero.
 454                  */
 455                 if ((control & 0xf) != 1)
 456                         ND_PRINT(" [ntup=%u]", control & 0xf);
 457                 if (EXTRACT_U_1(tp->enumerator))
 458                         ND_PRINT(" [enum=%u]", EXTRACT_U_1(tp->enumerator));
 459                 if (EXTRACT_BE_U_2(tp->net) != snet ||
 460                     EXTRACT_U_1(tp->node) != snode ||
 461                     EXTRACT_U_1(tp->skt) != skt)
 462                         ND_PRINT(" [addr=%s.%u]",
 463                             ataddr_string(ndo, EXTRACT_BE_U_2(tp->net),
 464                                           EXTRACT_U_1(tp->node)),
 465                             EXTRACT_U_1(tp->skt));
 466                 break;
 467
 468         case nbpLkUpReply:
 469                 ND_PRINT(" nbp-reply %u:", EXTRACT_U_1(np->id));
 470
 471                 /* print each of the tuples in the reply */
 472                 for (i = control & 0xf; i != 0 && tp; i--)
 473                         tp = nbp_tuple_print(ndo, tp, ep, snet, snode, skt);
 474                 break;
 475
 476         default:
 477                 ND_PRINT(" nbp-0x%x  %u (%u)", control, EXTRACT_U_1(np->id), length);
 478                 break;
 479         }
 480 }
 481
 482 /* print a counted string */
 483 static const char *
 484 print_cstring(netdissect_options *ndo,
 485               const char *cp, const u_char *ep)
 486 {
 487         u_int length;
 488
 489         if (cp >= (const char *)ep) {
 490                 ND_PRINT("%s", tstr);
 491                 return (0);
 492         }
 493         length = EXTRACT_U_1(cp);
 494         cp++;
 495
 496         /* Spec says string can be at most 32 bytes long */
 497         if (length > 32) {
 498                 ND_PRINT("[len=%u]", length);
 499                 return (0);
 500         }
 501         while (length != 0) {
 502                 if (cp >= (const char *)ep) {
 503                         ND_PRINT("%s", tstr);
 504                         return (0);
 505                 }
 506                 fn_print_char(ndo, EXTRACT_U_1(cp));
 507                 cp++;
 508                 length--;
 509         }
 510         return (cp);
 511 }
 512
 513 static const struct atNBPtuple *
 514 nbp_tuple_print(netdissect_options *ndo,
 515                 const struct atNBPtuple *tp, const u_char *ep,
 516                 u_short snet, u_char snode, u_char skt)
 517 {
 518         const struct atNBPtuple *tpn;
 519
 520         if ((const u_char *)(tp + 1) > ep) {
 521                 ND_PRINT("%s", tstr);
 522                 return 0;
 523         }
 524         tpn = nbp_name_print(ndo, tp, ep);
 525
 526         /* if the enumerator isn't 1, print it */
 527         if (EXTRACT_U_1(tp->enumerator) != 1)
 528                 ND_PRINT("(%u)", EXTRACT_U_1(tp->enumerator));
 529
 530         /* if the socket doesn't match the src socket, print it */
 531         if (EXTRACT_U_1(tp->skt) != skt)
 532                 ND_PRINT(" %u", EXTRACT_U_1(tp->skt));
 533
 534         /* if the address doesn't match the src address, it's an anomaly */
 535         if (EXTRACT_BE_U_2(tp->net) != snet ||
 536             EXTRACT_U_1(tp->node) != snode)
 537                 ND_PRINT(" [addr=%s]",
 538                     ataddr_string(ndo, EXTRACT_BE_U_2(tp->net), EXTRACT_U_1(tp->node)));
 539
 540         return (tpn);
 541 }
 542
 543 static const struct atNBPtuple *
 544 nbp_name_print(netdissect_options *ndo,
 545                const struct atNBPtuple *tp, const u_char *ep)
 546 {
 547         const char *cp = (const char *)tp + nbpTupleSize;
 548
 549         ND_PRINT(" ");
 550
 551         /* Object */
 552         ND_PRINT("\"");
 553         if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 554                 /* Type */
 555                 ND_PRINT(":");
 556                 if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 557                         /* Zone */
 558                         ND_PRINT("@");
 559                         if ((cp = print_cstring(ndo, cp, ep)) != NULL)
 560                                 ND_PRINT("\"");
 561                 }
 562         }
 563         return ((const struct atNBPtuple *)cp);
 564 }
 565
 566
 567 #define HASHNAMESIZE 4096
 568
 569 struct hnamemem {
 570         u_int addr;
 571         char *name;
 572         struct hnamemem *nxt;
 573 };
 574
 575 static struct hnamemem hnametable[HASHNAMESIZE];
 576
 577 static const char *
 578 ataddr_string(netdissect_options *ndo,
 579               u_short atnet, u_char athost)
 580 {
 581         struct hnamemem *tp, *tp2;
 582         u_int i = (atnet << 8) | athost;
 583         char nambuf[256+1];
 584         static int first = 1;
 585         FILE *fp;
 586
 587         /*
 588          * if this is the first call, see if there's an AppleTalk
 589          * number to name map file.
 590          */
 591         if (first && (first = 0, !ndo->ndo_nflag)
 592             && (fp = fopen("/etc/atalk.names", "r"))) {
 593                 char line[256];
 594                 u_int i1, i2;
 595
 596                 while (fgets(line, sizeof(line), fp)) {
 597                         if (line[0] == '\n' || line[0] == 0 || line[0] == '#')
 598                                 continue;
 599                         if (sscanf(line, "%u.%u %256s", &i1, &i2, nambuf) == 3)
 600                                 /* got a hostname. */
 601                                 i2 |= (i1 << 8);
 602                         else if (sscanf(line, "%u %256s", &i1, nambuf) == 2)
 603                                 /* got a net name */
 604                                 i2 = (i1 << 8) | 255;
 605                         else
 606                                 continue;
 607
 608                         for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
 609                              tp->nxt; tp = tp->nxt)
 610                                 ;
 611                         tp->addr = i2;
 612                         tp->nxt = newhnamemem(ndo);
 613                         tp->name = strdup(nambuf);
 614                         if (tp->name == NULL)
 615                                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 616                                         "ataddr_string: strdup(nambuf)");
 617                 }
 618                 fclose(fp);
 619         }
 620
 621         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 622                 if (tp->addr == i)
 623                         return (tp->name);
 624
 625         /* didn't have the node name -- see if we've got the net name */
 626         i |= 255;
 627         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 628                 if (tp2->addr == i) {
 629                         tp->addr = (atnet << 8) | athost;
 630                         tp->nxt = newhnamemem(ndo);
 631                         (void)nd_snprintf(nambuf, sizeof(nambuf), "%s.%u",
 632                             tp2->name, athost);
 633                         tp->name = strdup(nambuf);
 634                         if (tp->name == NULL)
 635                                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 636                                         "ataddr_string: strdup(nambuf)");
 637                         return (tp->name);
 638                 }
 639
 640         tp->addr = (atnet << 8) | athost;
 641         tp->nxt = newhnamemem(ndo);
 642         if (athost != 255)
 643                 (void)nd_snprintf(nambuf, sizeof(nambuf), "%u.%u", atnet, athost);
 644         else
 645                 (void)nd_snprintf(nambuf, sizeof(nambuf), "%u", atnet);
 646         tp->name = strdup(nambuf);
 647         if (tp->name == NULL)
 648                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 649                                   "ataddr_string: strdup(nambuf)");
 650
 651         return (tp->name);
 652 }
 653
 654 static const struct tok skt2str[] = {
 655         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 656         { nbpSkt,       "nis" },        /* name info socket */
 657         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 658         { zipSkt,       "zip" },        /* zone info protocol */
 659         { 0,            NULL }
 660 };
 661
 662 static const char *
 663 ddpskt_string(netdissect_options *ndo,
 664               u_int skt)
 665 {
 666         static char buf[8];
 667
 668         if (ndo->ndo_nflag) {
 669                 (void)nd_snprintf(buf, sizeof(buf), "%u", skt);
 670                 return (buf);
 671         }
 672         return (tok2str(skt2str, "%u", skt));
 673 }