contrib/tcpdump/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         nd_mac_addr     hsaddr;
  55         uint8_t         psaddr[4];
  56         nd_mac_addr     hdaddr;
  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 void
  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";
  82         hdrlen = llap_print(ndo, p, h->len);
  83         if (hdrlen == 0) {
  84                 /* Cut short by the snapshot length. */
  85                 ndo->ndo_ll_hdr_len += h->caplen;
  86                 return;
  87         }
  88         ndo->ndo_ll_hdr_len += 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_trunc(ndo);
 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 (GET_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, GET_U_1(lp->src)),
 131                     ddpskt_string(ndo, GET_U_1(sdp->srcSkt)));
 132                 ND_PRINT(" > %s.%s:",
 133                     ataddr_string(ndo, 0, GET_U_1(lp->dst)),
 134                     ddpskt_string(ndo, GET_U_1(sdp->dstSkt)));
 135                 bp += ddpSSize;
 136                 length -= ddpSSize;
 137                 hdrlen += ddpSSize;
 138                 ddp_print(ndo, bp, length, GET_U_1(sdp->type), 0,
 139                           GET_U_1(lp->src), GET_U_1(sdp->srcSkt));
 140                 break;
 141
 142         case lapDDP:
 143                 if (length < ddpSize) {
 144                         ND_PRINT(" [|ddp %u]", length);
 145                         return (length);
 146                 }
 147                 if (!ND_TTEST_LEN(bp, ddpSize)) {
 148                         ND_PRINT(" [|ddp]");
 149                         return (0);     /* cut short by the snapshot length */
 150                 }
 151                 dp = (const struct atDDP *)bp;
 152                 snet = GET_BE_U_2(dp->srcNet);
 153                 ND_PRINT("%s.%s",
 154                          ataddr_string(ndo, snet, GET_U_1(dp->srcNode)),
 155                          ddpskt_string(ndo, GET_U_1(dp->srcSkt)));
 156                 ND_PRINT(" > %s.%s:",
 157                     ataddr_string(ndo, GET_BE_U_2(dp->dstNet), GET_U_1(dp->dstNode)),
 158                     ddpskt_string(ndo, GET_U_1(dp->dstSkt)));
 159                 bp += ddpSize;
 160                 length -= ddpSize;
 161                 hdrlen += ddpSize;
 162                 ddp_print(ndo, bp, length, GET_U_1(dp->type), snet,
 163                           GET_U_1(dp->srcNode), GET_U_1(dp->srcSkt));
 164                 break;
 165
 166 #ifdef notdef
 167         case lapKLAP:
 168                 klap_print(bp, length);
 169                 break;
 170 #endif
 171
 172         default:
 173                 ND_PRINT("%u > %u at-lap#%u %u",
 174                     GET_U_1(lp->src), GET_U_1(lp->dst), GET_U_1(lp->type),
 175                     length);
 176                 break;
 177         }
 178         return (hdrlen);
 179 }
 180
 181 /*
 182  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 183  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 184  * packets in them).
 185  */
 186 void
 187 atalk_print(netdissect_options *ndo,
 188             const u_char *bp, u_int length)
 189 {
 190         const struct atDDP *dp;
 191         u_short snet;
 192
 193         ndo->ndo_protocol = "atalk";
 194         if(!ndo->ndo_eflag)
 195             ND_PRINT("AT ");
 196
 197         if (length < ddpSize) {
 198                 ND_PRINT(" [|ddp %u]", length);
 199                 return;
 200         }
 201         if (!ND_TTEST_LEN(bp, ddpSize)) {
 202                 ND_PRINT(" [|ddp]");
 203                 return;
 204         }
 205         dp = (const struct atDDP *)bp;
 206         snet = GET_BE_U_2(dp->srcNet);
 207         ND_PRINT("%s.%s", ataddr_string(ndo, snet, GET_U_1(dp->srcNode)),
 208                  ddpskt_string(ndo, GET_U_1(dp->srcSkt)));
 209         ND_PRINT(" > %s.%s: ",
 210                ataddr_string(ndo, GET_BE_U_2(dp->dstNet), GET_U_1(dp->dstNode)),
 211                ddpskt_string(ndo, GET_U_1(dp->dstSkt)));
 212         bp += ddpSize;
 213         length -= ddpSize;
 214         ddp_print(ndo, bp, length, GET_U_1(dp->type), snet,
 215                   GET_U_1(dp->srcNode), GET_U_1(dp->srcSkt));
 216 }
 217
 218 /* XXX should probably pass in the snap header and do checks like arp_print() */
 219 void
 220 aarp_print(netdissect_options *ndo,
 221            const u_char *bp, u_int length)
 222 {
 223         const struct aarp *ap;
 224
 225 #define AT(member) ataddr_string(ndo, (ap->member[1]<<8)|ap->member[2],ap->member[3])
 226
 227         ndo->ndo_protocol = "aarp";
 228         ND_PRINT("aarp ");
 229         ap = (const struct aarp *)bp;
 230         if (!ND_TTEST_SIZE(ap)) {
 231                 /* Just bail if we don't have the whole chunk. */
 232                 nd_print_trunc(ndo);
 233                 return;
 234         }
 235         if (length < sizeof(*ap)) {
 236                 ND_PRINT(" [|aarp %u]", length);
 237                 return;
 238         }
 239         if (GET_BE_U_2(ap->htype) == 1 &&
 240             GET_BE_U_2(ap->ptype) == ETHERTYPE_ATALK &&
 241             GET_U_1(ap->halen) == MAC_ADDR_LEN && GET_U_1(ap->palen) == 4)
 242                 switch (GET_BE_U_2(ap->op)) {
 243
 244                 case 1:                         /* request */
 245                         ND_PRINT("who-has %s tell %s", AT(pdaddr), AT(psaddr));
 246                         return;
 247
 248                 case 2:                         /* response */
 249                         ND_PRINT("reply %s is-at %s", AT(psaddr), GET_ETHERADDR_STRING(ap->hsaddr));
 250                         return;
 251
 252                 case 3:                         /* probe (oy!) */
 253                         ND_PRINT("probe %s tell %s", AT(pdaddr), AT(psaddr));
 254                         return;
 255                 }
 256         ND_PRINT("len %u op %u htype %u ptype %#x halen %u palen %u",
 257             length, GET_BE_U_2(ap->op), GET_BE_U_2(ap->htype),
 258             GET_BE_U_2(ap->ptype), GET_U_1(ap->halen), GET_U_1(ap->palen));
 259 }
 260
 261 /*
 262  * Print AppleTalk Datagram Delivery Protocol packets.
 263  */
 264 static void
 265 ddp_print(netdissect_options *ndo,
 266           const u_char *bp, u_int length, u_int t,
 267           u_short snet, u_char snode, u_char skt)
 268 {
 269
 270         switch (t) {
 271
 272         case ddpNBP:
 273                 nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
 274                 break;
 275
 276         case ddpATP:
 277                 atp_print(ndo, (const struct atATP *)bp, length);
 278                 break;
 279
 280         case ddpEIGRP:
 281                 eigrp_print(ndo, bp, length);
 282                 break;
 283
 284         default:
 285                 ND_PRINT(" at-%s %u", tok2str(type2str, NULL, t), length);
 286                 break;
 287         }
 288 }
 289
 290 static void
 291 atp_print(netdissect_options *ndo,
 292           const struct atATP *ap, u_int length)
 293 {
 294         uint8_t control;
 295         uint32_t data;
 296
 297         if ((const u_char *)(ap + 1) > ndo->ndo_snapend) {
 298                 /* Just bail if we don't have the whole chunk. */
 299                 nd_print_trunc(ndo);
 300                 return;
 301         }
 302         if (length < sizeof(*ap)) {
 303                 ND_PRINT(" [|atp %u]", length);
 304                 return;
 305         }
 306         length -= sizeof(*ap);
 307         control = GET_U_1(ap->control);
 308         switch (control & 0xc0) {
 309
 310         case atpReqCode:
 311                 ND_PRINT(" atp-req%s %u",
 312                              control & atpXO? " " : "*",
 313                              GET_BE_U_2(ap->transID));
 314
 315                 atp_bitmap_print(ndo, GET_U_1(ap->bitmap));
 316
 317                 if (length != 0)
 318                         ND_PRINT(" [len=%u]", length);
 319
 320                 switch (control & (atpEOM|atpSTS)) {
 321                 case atpEOM:
 322                         ND_PRINT(" [EOM]");
 323                         break;
 324                 case atpSTS:
 325                         ND_PRINT(" [STS]");
 326                         break;
 327                 case atpEOM|atpSTS:
 328                         ND_PRINT(" [EOM,STS]");
 329                         break;
 330                 }
 331                 break;
 332
 333         case atpRspCode:
 334                 ND_PRINT(" atp-resp%s%u:%u (%u)",
 335                              control & atpEOM? "*" : " ",
 336                              GET_BE_U_2(ap->transID), GET_U_1(ap->bitmap),
 337                              length);
 338                 switch (control & (atpXO|atpSTS)) {
 339                 case atpXO:
 340                         ND_PRINT(" [XO]");
 341                         break;
 342                 case atpSTS:
 343                         ND_PRINT(" [STS]");
 344                         break;
 345                 case atpXO|atpSTS:
 346                         ND_PRINT(" [XO,STS]");
 347                         break;
 348                 }
 349                 break;
 350
 351         case atpRelCode:
 352                 ND_PRINT(" atp-rel  %u", GET_BE_U_2(ap->transID));
 353
 354                 atp_bitmap_print(ndo, GET_U_1(ap->bitmap));
 355
 356                 /* length should be zero */
 357                 if (length)
 358                         ND_PRINT(" [len=%u]", length);
 359
 360                 /* there shouldn't be any control flags */
 361                 if (control & (atpXO|atpEOM|atpSTS)) {
 362                         char c = '[';
 363                         if (control & atpXO) {
 364                                 ND_PRINT("%cXO", c);
 365                                 c = ',';
 366                         }
 367                         if (control & atpEOM) {
 368                                 ND_PRINT("%cEOM", c);
 369                                 c = ',';
 370                         }
 371                         if (control & atpSTS) {
 372                                 ND_PRINT("%cSTS", c);
 373                         }
 374                         ND_PRINT("]");
 375                 }
 376                 break;
 377
 378         default:
 379                 ND_PRINT(" atp-0x%x  %u (%u)", control,
 380                              GET_BE_U_2(ap->transID), length);
 381                 break;
 382         }
 383         data = GET_BE_U_4(ap->userData);
 384         if (data != 0)
 385                 ND_PRINT(" 0x%x", data);
 386 }
 387
 388 static void
 389 atp_bitmap_print(netdissect_options *ndo,
 390                  u_char bm)
 391 {
 392         u_int i;
 393
 394         /*
 395          * The '& 0xff' below is needed for compilers that want to sign
 396          * extend a u_char, which is the case with the Ultrix compiler.
 397          * (gcc is smart enough to eliminate it, at least on the Sparc).
 398          */
 399         if ((bm + 1) & (bm & 0xff)) {
 400                 char c = '<';
 401                 for (i = 0; bm; ++i) {
 402                         if (bm & 1) {
 403                                 ND_PRINT("%c%u", c, i);
 404                                 c = ',';
 405                         }
 406                         bm >>= 1;
 407                 }
 408                 ND_PRINT(">");
 409         } else {
 410                 for (i = 0; bm; ++i)
 411                         bm >>= 1;
 412                 if (i > 1)
 413                         ND_PRINT("<0-%u>", i - 1);
 414                 else
 415                         ND_PRINT("<0>");
 416         }
 417 }
 418
 419 static void
 420 nbp_print(netdissect_options *ndo,
 421           const struct atNBP *np, u_int length, u_short snet,
 422           u_char snode, u_char skt)
 423 {
 424         const struct atNBPtuple *tp =
 425                 (const struct atNBPtuple *)((const u_char *)np + nbpHeaderSize);
 426         uint8_t control;
 427         u_int i;
 428         const u_char *ep;
 429
 430         if (length < nbpHeaderSize) {
 431                 ND_PRINT(" truncated-nbp %u", length);
 432                 return;
 433         }
 434
 435         length -= nbpHeaderSize;
 436         if (length < 8) {
 437                 /* must be room for at least one tuple */
 438                 ND_PRINT(" truncated-nbp %u", length + nbpHeaderSize);
 439                 return;
 440         }
 441         /* ep points to end of available data */
 442         ep = ndo->ndo_snapend;
 443         if ((const u_char *)tp > ep) {
 444                 nd_print_trunc(ndo);
 445                 return;
 446         }
 447         control = GET_U_1(np->control);
 448         switch (i = (control & 0xf0)) {
 449
 450         case nbpBrRq:
 451         case nbpLkUp:
 452                 ND_PRINT(i == nbpLkUp? " nbp-lkup %u:":" nbp-brRq %u:",
 453                          GET_U_1(np->id));
 454                 if ((const u_char *)(tp + 1) > ep) {
 455                         nd_print_trunc(ndo);
 456                         return;
 457                 }
 458                 (void)nbp_name_print(ndo, tp, ep);
 459                 /*
 460                  * look for anomalies: the spec says there can only
 461                  * be one tuple, the address must match the source
 462                  * address and the enumerator should be zero.
 463                  */
 464                 if ((control & 0xf) != 1)
 465                         ND_PRINT(" [ntup=%u]", control & 0xf);
 466                 if (GET_U_1(tp->enumerator))
 467                         ND_PRINT(" [enum=%u]", GET_U_1(tp->enumerator));
 468                 if (GET_BE_U_2(tp->net) != snet ||
 469                     GET_U_1(tp->node) != snode ||
 470                     GET_U_1(tp->skt) != skt)
 471                         ND_PRINT(" [addr=%s.%u]",
 472                             ataddr_string(ndo, GET_BE_U_2(tp->net),
 473                                           GET_U_1(tp->node)),
 474                             GET_U_1(tp->skt));
 475                 break;
 476
 477         case nbpLkUpReply:
 478                 ND_PRINT(" nbp-reply %u:", GET_U_1(np->id));
 479
 480                 /* print each of the tuples in the reply */
 481                 for (i = control & 0xf; i != 0 && tp; i--)
 482                         tp = nbp_tuple_print(ndo, tp, ep, snet, snode, skt);
 483                 break;
 484
 485         default:
 486                 ND_PRINT(" nbp-0x%x  %u (%u)", control, GET_U_1(np->id),
 487                          length);
 488                 break;
 489         }
 490 }
 491
 492 /* print a counted string */
 493 static const u_char *
 494 print_cstring(netdissect_options *ndo,
 495               const u_char *cp, const u_char *ep)
 496 {
 497         u_int length;
 498
 499         if (cp >= ep) {
 500                 nd_print_trunc(ndo);
 501                 return (0);
 502         }
 503         length = GET_U_1(cp);
 504         cp++;
 505
 506         /* Spec says string can be at most 32 bytes long */
 507         if (length > 32) {
 508                 ND_PRINT("[len=%u]", length);
 509                 return (0);
 510         }
 511         while (length != 0) {
 512                 if (cp >= ep) {
 513                         nd_print_trunc(ndo);
 514                         return (0);
 515                 }
 516                 fn_print_char(ndo, GET_U_1(cp));
 517                 cp++;
 518                 length--;
 519         }
 520         return (cp);
 521 }
 522
 523 static const struct atNBPtuple *
 524 nbp_tuple_print(netdissect_options *ndo,
 525                 const struct atNBPtuple *tp, const u_char *ep,
 526                 u_short snet, u_char snode, u_char skt)
 527 {
 528         const struct atNBPtuple *tpn;
 529
 530         if ((const u_char *)(tp + 1) > ep) {
 531                 nd_print_trunc(ndo);
 532                 return 0;
 533         }
 534         tpn = nbp_name_print(ndo, tp, ep);
 535
 536         /* if the enumerator isn't 1, print it */
 537         if (GET_U_1(tp->enumerator) != 1)
 538                 ND_PRINT("(%u)", GET_U_1(tp->enumerator));
 539
 540         /* if the socket doesn't match the src socket, print it */
 541         if (GET_U_1(tp->skt) != skt)
 542                 ND_PRINT(" %u", GET_U_1(tp->skt));
 543
 544         /* if the address doesn't match the src address, it's an anomaly */
 545         if (GET_BE_U_2(tp->net) != snet ||
 546             GET_U_1(tp->node) != snode)
 547                 ND_PRINT(" [addr=%s]",
 548                     ataddr_string(ndo, GET_BE_U_2(tp->net), GET_U_1(tp->node)));
 549
 550         return (tpn);
 551 }
 552
 553 static const struct atNBPtuple *
 554 nbp_name_print(netdissect_options *ndo,
 555                const struct atNBPtuple *tp, const u_char *ep)
 556 {
 557         const u_char *cp = (const u_char *)tp + nbpTupleSize;
 558
 559         ND_PRINT(" ");
 560
 561         /* Object */
 562         ND_PRINT("\"");
 563         if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 564                 /* Type */
 565                 ND_PRINT(":");
 566                 if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 567                         /* Zone */
 568                         ND_PRINT("@");
 569                         if ((cp = print_cstring(ndo, cp, ep)) != NULL)
 570                                 ND_PRINT("\"");
 571                 }
 572         }
 573         return ((const struct atNBPtuple *)cp);
 574 }
 575
 576
 577 #define HASHNAMESIZE 4096
 578
 579 struct hnamemem {
 580         u_int addr;
 581         char *name;
 582         struct hnamemem *nxt;
 583 };
 584
 585 static struct hnamemem hnametable[HASHNAMESIZE];
 586
 587 static const char *
 588 ataddr_string(netdissect_options *ndo,
 589               u_short atnet, u_char athost)
 590 {
 591         struct hnamemem *tp, *tp2;
 592         u_int i = (atnet << 8) | athost;
 593         char nambuf[256+1];
 594         static int first = 1;
 595         FILE *fp;
 596
 597         /*
 598          * Are we doing address to name resolution?
 599          */
 600         if (!ndo->ndo_nflag) {
 601                 /*
 602                  * Yes.  Have we tried to open and read an AppleTalk
 603                  * number to name map file?
 604                  */
 605                 if (!first) {
 606                         /*
 607                          * No; try to do so.
 608                          */
 609                         first = 0;
 610                         fp = fopen("/etc/atalk.names", "r");
 611                         if (fp != NULL) {
 612                                 char line[256];
 613                                 u_int i1, i2;
 614
 615                                 while (fgets(line, sizeof(line), fp)) {
 616                                         if (line[0] == '\n' || line[0] == 0 ||
 617                                             line[0] == '#')
 618                                                 continue;
 619                                         if (sscanf(line, "%u.%u %256s", &i1,
 620                                             &i2, nambuf) == 3)
 621                                                 /* got a hostname. */
 622                                                 i2 |= (i1 << 8);
 623                                         else if (sscanf(line, "%u %256s", &i1,
 624                                             nambuf) == 2)
 625                                                 /* got a net name */
 626                                                 i2 = (i1 << 8) | 255;
 627                                         else
 628                                                 continue;
 629
 630                                         for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
 631                                              tp->nxt; tp = tp->nxt)
 632                                                 ;
 633                                         tp->addr = i2;
 634                                         tp->nxt = newhnamemem(ndo);
 635                                         tp->name = strdup(nambuf);
 636                                         if (tp->name == NULL)
 637                                                 (*ndo->ndo_error)(ndo,
 638                                                     S_ERR_ND_MEM_ALLOC,
 639                                                     "%s: strdup(nambuf)", __func__);
 640                                 }
 641                                 fclose(fp);
 642                         }
 643                 }
 644         }
 645
 646         /*
 647          * Now try to look up the address in the table.
 648          */
 649         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 650                 if (tp->addr == i)
 651                         return (tp->name);
 652
 653         /* didn't have the node name -- see if we've got the net name */
 654         i |= 255;
 655         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 656                 if (tp2->addr == i) {
 657                         tp->addr = (atnet << 8) | athost;
 658                         tp->nxt = newhnamemem(ndo);
 659                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%u",
 660                             tp2->name, athost);
 661                         tp->name = strdup(nambuf);
 662                         if (tp->name == NULL)
 663                                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 664                                         "%s: strdup(nambuf)", __func__);
 665                         return (tp->name);
 666                 }
 667
 668         tp->addr = (atnet << 8) | athost;
 669         tp->nxt = newhnamemem(ndo);
 670         if (athost != 255)
 671                 (void)snprintf(nambuf, sizeof(nambuf), "%u.%u", atnet, athost);
 672         else
 673                 (void)snprintf(nambuf, sizeof(nambuf), "%u", atnet);
 674         tp->name = strdup(nambuf);
 675         if (tp->name == NULL)
 676                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 677                                   "%s: strdup(nambuf)", __func__);
 678
 679         return (tp->name);
 680 }
 681
 682 static const struct tok skt2str[] = {
 683         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 684         { nbpSkt,       "nis" },        /* name info socket */
 685         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 686         { zipSkt,       "zip" },        /* zone info protocol */
 687         { 0,            NULL }
 688 };
 689
 690 static const char *
 691 ddpskt_string(netdissect_options *ndo,
 692               u_int skt)
 693 {
 694         static char buf[8];
 695
 696         if (ndo->ndo_nflag) {
 697                 (void)snprintf(buf, sizeof(buf), "%u", skt);
 698                 return (buf);
 699         }
 700         return (tok2str(skt2str, "%u", skt));
 701 }