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 (GET_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, GET_U_1(lp->src)),
 130                     ddpskt_string(ndo, GET_U_1(sdp->srcSkt)));
 131                 ND_PRINT(" > %s.%s:",
 132                     ataddr_string(ndo, 0, GET_U_1(lp->dst)),
 133                     ddpskt_string(ndo, GET_U_1(sdp->dstSkt)));
 134                 bp += ddpSSize;
 135                 length -= ddpSSize;
 136                 hdrlen += ddpSSize;
 137                 ddp_print(ndo, bp, length, GET_U_1(sdp->type), 0,
 138                           GET_U_1(lp->src), GET_U_1(sdp->srcSkt));
 139                 break;
 140
 141         case lapDDP:
 142                 if (length < ddpSize) {
 143                         ND_PRINT(" [|ddp %u]", length);
 144                         return (length);
 145                 }
 146                 if (!ND_TTEST_LEN(bp, ddpSize)) {
 147                         ND_PRINT(" [|ddp]");
 148                         return (0);     /* cut short by the snapshot length */
 149                 }
 150                 dp = (const struct atDDP *)bp;
 151                 snet = GET_BE_U_2(dp->srcNet);
 152                 ND_PRINT("%s.%s",
 153                          ataddr_string(ndo, snet, GET_U_1(dp->srcNode)),
 154                          ddpskt_string(ndo, GET_U_1(dp->srcSkt)));
 155                 ND_PRINT(" > %s.%s:",
 156                     ataddr_string(ndo, GET_BE_U_2(dp->dstNet), GET_U_1(dp->dstNode)),
 157                     ddpskt_string(ndo, GET_U_1(dp->dstSkt)));
 158                 bp += ddpSize;
 159                 length -= ddpSize;
 160                 hdrlen += ddpSize;
 161                 ddp_print(ndo, bp, length, GET_U_1(dp->type), snet,
 162                           GET_U_1(dp->srcNode), GET_U_1(dp->srcSkt));
 163                 break;
 164
 165 #ifdef notdef
 166         case lapKLAP:
 167                 klap_print(bp, length);
 168                 break;
 169 #endif
 170
 171         default:
 172                 ND_PRINT("%u > %u at-lap#%u %u",
 173                     GET_U_1(lp->src), GET_U_1(lp->dst), GET_U_1(lp->type),
 174                     length);
 175                 break;
 176         }
 177         return (hdrlen);
 178 }
 179
 180 /*
 181  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 182  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 183  * packets in them).
 184  */
 185 void
 186 atalk_print(netdissect_options *ndo,
 187             const u_char *bp, u_int length)
 188 {
 189         const struct atDDP *dp;
 190         u_short snet;
 191
 192         ndo->ndo_protocol = "atalk";
 193         if(!ndo->ndo_eflag)
 194             ND_PRINT("AT ");
 195
 196         if (length < ddpSize) {
 197                 ND_PRINT(" [|ddp %u]", length);
 198                 return;
 199         }
 200         if (!ND_TTEST_LEN(bp, ddpSize)) {
 201                 ND_PRINT(" [|ddp]");
 202                 return;
 203         }
 204         dp = (const struct atDDP *)bp;
 205         snet = GET_BE_U_2(dp->srcNet);
 206         ND_PRINT("%s.%s", ataddr_string(ndo, snet, GET_U_1(dp->srcNode)),
 207                  ddpskt_string(ndo, GET_U_1(dp->srcSkt)));
 208         ND_PRINT(" > %s.%s: ",
 209                ataddr_string(ndo, GET_BE_U_2(dp->dstNet), GET_U_1(dp->dstNode)),
 210                ddpskt_string(ndo, GET_U_1(dp->dstSkt)));
 211         bp += ddpSize;
 212         length -= ddpSize;
 213         ddp_print(ndo, bp, length, GET_U_1(dp->type), snet,
 214                   GET_U_1(dp->srcNode), GET_U_1(dp->srcSkt));
 215 }
 216
 217 /* XXX should probably pass in the snap header and do checks like arp_print() */
 218 void
 219 aarp_print(netdissect_options *ndo,
 220            const u_char *bp, u_int length)
 221 {
 222         const struct aarp *ap;
 223
 224 #define AT(member) ataddr_string(ndo, (ap->member[1]<<8)|ap->member[2],ap->member[3])
 225
 226         ndo->ndo_protocol = "aarp";
 227         ND_PRINT("aarp ");
 228         ap = (const struct aarp *)bp;
 229         if (!ND_TTEST_SIZE(ap)) {
 230                 /* Just bail if we don't have the whole chunk. */
 231                 nd_print_trunc(ndo);
 232                 return;
 233         }
 234         if (length < sizeof(*ap)) {
 235                 ND_PRINT(" [|aarp %u]", length);
 236                 return;
 237         }
 238         if (GET_BE_U_2(ap->htype) == 1 &&
 239             GET_BE_U_2(ap->ptype) == ETHERTYPE_ATALK &&
 240             GET_U_1(ap->halen) == 6 && GET_U_1(ap->palen) == 4 )
 241                 switch (GET_BE_U_2(ap->op)) {
 242
 243                 case 1:                         /* request */
 244                         ND_PRINT("who-has %s tell %s", AT(pdaddr), AT(psaddr));
 245                         return;
 246
 247                 case 2:                         /* response */
 248                         ND_PRINT("reply %s is-at %s", AT(psaddr), GET_ETHERADDR_STRING(ap->hsaddr));
 249                         return;
 250
 251                 case 3:                         /* probe (oy!) */
 252                         ND_PRINT("probe %s tell %s", AT(pdaddr), AT(psaddr));
 253                         return;
 254                 }
 255         ND_PRINT("len %u op %u htype %u ptype %#x halen %u palen %u",
 256             length, GET_BE_U_2(ap->op), GET_BE_U_2(ap->htype),
 257             GET_BE_U_2(ap->ptype), GET_U_1(ap->halen), GET_U_1(ap->palen));
 258 }
 259
 260 /*
 261  * Print AppleTalk Datagram Delivery Protocol packets.
 262  */
 263 static void
 264 ddp_print(netdissect_options *ndo,
 265           const u_char *bp, u_int length, u_int t,
 266           u_short snet, u_char snode, u_char skt)
 267 {
 268
 269         switch (t) {
 270
 271         case ddpNBP:
 272                 nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
 273                 break;
 274
 275         case ddpATP:
 276                 atp_print(ndo, (const struct atATP *)bp, length);
 277                 break;
 278
 279         case ddpEIGRP:
 280                 eigrp_print(ndo, bp, length);
 281                 break;
 282
 283         default:
 284                 ND_PRINT(" at-%s %u", tok2str(type2str, NULL, t), length);
 285                 break;
 286         }
 287 }
 288
 289 static void
 290 atp_print(netdissect_options *ndo,
 291           const struct atATP *ap, u_int length)
 292 {
 293         uint8_t control;
 294         uint32_t data;
 295
 296         if ((const u_char *)(ap + 1) > ndo->ndo_snapend) {
 297                 /* Just bail if we don't have the whole chunk. */
 298                 nd_print_trunc(ndo);
 299                 return;
 300         }
 301         if (length < sizeof(*ap)) {
 302                 ND_PRINT(" [|atp %u]", length);
 303                 return;
 304         }
 305         length -= sizeof(*ap);
 306         control = GET_U_1(ap->control);
 307         switch (control & 0xc0) {
 308
 309         case atpReqCode:
 310                 ND_PRINT(" atp-req%s %u",
 311                              control & atpXO? " " : "*",
 312                              GET_BE_U_2(ap->transID));
 313
 314                 atp_bitmap_print(ndo, GET_U_1(ap->bitmap));
 315
 316                 if (length != 0)
 317                         ND_PRINT(" [len=%u]", length);
 318
 319                 switch (control & (atpEOM|atpSTS)) {
 320                 case atpEOM:
 321                         ND_PRINT(" [EOM]");
 322                         break;
 323                 case atpSTS:
 324                         ND_PRINT(" [STS]");
 325                         break;
 326                 case atpEOM|atpSTS:
 327                         ND_PRINT(" [EOM,STS]");
 328                         break;
 329                 }
 330                 break;
 331
 332         case atpRspCode:
 333                 ND_PRINT(" atp-resp%s%u:%u (%u)",
 334                              control & atpEOM? "*" : " ",
 335                              GET_BE_U_2(ap->transID), GET_U_1(ap->bitmap),
 336                              length);
 337                 switch (control & (atpXO|atpSTS)) {
 338                 case atpXO:
 339                         ND_PRINT(" [XO]");
 340                         break;
 341                 case atpSTS:
 342                         ND_PRINT(" [STS]");
 343                         break;
 344                 case atpXO|atpSTS:
 345                         ND_PRINT(" [XO,STS]");
 346                         break;
 347                 }
 348                 break;
 349
 350         case atpRelCode:
 351                 ND_PRINT(" atp-rel  %u", GET_BE_U_2(ap->transID));
 352
 353                 atp_bitmap_print(ndo, GET_U_1(ap->bitmap));
 354
 355                 /* length should be zero */
 356                 if (length)
 357                         ND_PRINT(" [len=%u]", length);
 358
 359                 /* there shouldn't be any control flags */
 360                 if (control & (atpXO|atpEOM|atpSTS)) {
 361                         char c = '[';
 362                         if (control & atpXO) {
 363                                 ND_PRINT("%cXO", c);
 364                                 c = ',';
 365                         }
 366                         if (control & atpEOM) {
 367                                 ND_PRINT("%cEOM", c);
 368                                 c = ',';
 369                         }
 370                         if (control & atpSTS) {
 371                                 ND_PRINT("%cSTS", c);
 372                         }
 373                         ND_PRINT("]");
 374                 }
 375                 break;
 376
 377         default:
 378                 ND_PRINT(" atp-0x%x  %u (%u)", control,
 379                              GET_BE_U_2(ap->transID), length);
 380                 break;
 381         }
 382         data = GET_BE_U_4(ap->userData);
 383         if (data != 0)
 384                 ND_PRINT(" 0x%x", data);
 385 }
 386
 387 static void
 388 atp_bitmap_print(netdissect_options *ndo,
 389                  u_char bm)
 390 {
 391         u_int i;
 392
 393         /*
 394          * The '& 0xff' below is needed for compilers that want to sign
 395          * extend a u_char, which is the case with the Ultrix compiler.
 396          * (gcc is smart enough to eliminate it, at least on the Sparc).
 397          */
 398         if ((bm + 1) & (bm & 0xff)) {
 399                 char c = '<';
 400                 for (i = 0; bm; ++i) {
 401                         if (bm & 1) {
 402                                 ND_PRINT("%c%u", c, i);
 403                                 c = ',';
 404                         }
 405                         bm >>= 1;
 406                 }
 407                 ND_PRINT(">");
 408         } else {
 409                 for (i = 0; bm; ++i)
 410                         bm >>= 1;
 411                 if (i > 1)
 412                         ND_PRINT("<0-%u>", i - 1);
 413                 else
 414                         ND_PRINT("<0>");
 415         }
 416 }
 417
 418 static void
 419 nbp_print(netdissect_options *ndo,
 420           const struct atNBP *np, u_int length, u_short snet,
 421           u_char snode, u_char skt)
 422 {
 423         const struct atNBPtuple *tp =
 424                 (const struct atNBPtuple *)((const u_char *)np + nbpHeaderSize);
 425         uint8_t control;
 426         u_int i;
 427         const u_char *ep;
 428
 429         if (length < nbpHeaderSize) {
 430                 ND_PRINT(" truncated-nbp %u", length);
 431                 return;
 432         }
 433
 434         length -= nbpHeaderSize;
 435         if (length < 8) {
 436                 /* must be room for at least one tuple */
 437                 ND_PRINT(" truncated-nbp %u", length + nbpHeaderSize);
 438                 return;
 439         }
 440         /* ep points to end of available data */
 441         ep = ndo->ndo_snapend;
 442         if ((const u_char *)tp > ep) {
 443                 nd_print_trunc(ndo);
 444                 return;
 445         }
 446         control = GET_U_1(np->control);
 447         switch (i = (control & 0xf0)) {
 448
 449         case nbpBrRq:
 450         case nbpLkUp:
 451                 ND_PRINT(i == nbpLkUp? " nbp-lkup %u:":" nbp-brRq %u:",
 452                          GET_U_1(np->id));
 453                 if ((const u_char *)(tp + 1) > ep) {
 454                         nd_print_trunc(ndo);
 455                         return;
 456                 }
 457                 (void)nbp_name_print(ndo, tp, ep);
 458                 /*
 459                  * look for anomalies: the spec says there can only
 460                  * be one tuple, the address must match the source
 461                  * address and the enumerator should be zero.
 462                  */
 463                 if ((control & 0xf) != 1)
 464                         ND_PRINT(" [ntup=%u]", control & 0xf);
 465                 if (GET_U_1(tp->enumerator))
 466                         ND_PRINT(" [enum=%u]", GET_U_1(tp->enumerator));
 467                 if (GET_BE_U_2(tp->net) != snet ||
 468                     GET_U_1(tp->node) != snode ||
 469                     GET_U_1(tp->skt) != skt)
 470                         ND_PRINT(" [addr=%s.%u]",
 471                             ataddr_string(ndo, GET_BE_U_2(tp->net),
 472                                           GET_U_1(tp->node)),
 473                             GET_U_1(tp->skt));
 474                 break;
 475
 476         case nbpLkUpReply:
 477                 ND_PRINT(" nbp-reply %u:", GET_U_1(np->id));
 478
 479                 /* print each of the tuples in the reply */
 480                 for (i = control & 0xf; i != 0 && tp; i--)
 481                         tp = nbp_tuple_print(ndo, tp, ep, snet, snode, skt);
 482                 break;
 483
 484         default:
 485                 ND_PRINT(" nbp-0x%x  %u (%u)", control, GET_U_1(np->id),
 486                          length);
 487                 break;
 488         }
 489 }
 490
 491 /* print a counted string */
 492 static const u_char *
 493 print_cstring(netdissect_options *ndo,
 494               const u_char *cp, const u_char *ep)
 495 {
 496         u_int length;
 497
 498         if (cp >= ep) {
 499                 nd_print_trunc(ndo);
 500                 return (0);
 501         }
 502         length = GET_U_1(cp);
 503         cp++;
 504
 505         /* Spec says string can be at most 32 bytes long */
 506         if (length > 32) {
 507                 ND_PRINT("[len=%u]", length);
 508                 return (0);
 509         }
 510         while (length != 0) {
 511                 if (cp >= ep) {
 512                         nd_print_trunc(ndo);
 513                         return (0);
 514                 }
 515                 fn_print_char(ndo, GET_U_1(cp));
 516                 cp++;
 517                 length--;
 518         }
 519         return (cp);
 520 }
 521
 522 static const struct atNBPtuple *
 523 nbp_tuple_print(netdissect_options *ndo,
 524                 const struct atNBPtuple *tp, const u_char *ep,
 525                 u_short snet, u_char snode, u_char skt)
 526 {
 527         const struct atNBPtuple *tpn;
 528
 529         if ((const u_char *)(tp + 1) > ep) {
 530                 nd_print_trunc(ndo);
 531                 return 0;
 532         }
 533         tpn = nbp_name_print(ndo, tp, ep);
 534
 535         /* if the enumerator isn't 1, print it */
 536         if (GET_U_1(tp->enumerator) != 1)
 537                 ND_PRINT("(%u)", GET_U_1(tp->enumerator));
 538
 539         /* if the socket doesn't match the src socket, print it */
 540         if (GET_U_1(tp->skt) != skt)
 541                 ND_PRINT(" %u", GET_U_1(tp->skt));
 542
 543         /* if the address doesn't match the src address, it's an anomaly */
 544         if (GET_BE_U_2(tp->net) != snet ||
 545             GET_U_1(tp->node) != snode)
 546                 ND_PRINT(" [addr=%s]",
 547                     ataddr_string(ndo, GET_BE_U_2(tp->net), GET_U_1(tp->node)));
 548
 549         return (tpn);
 550 }
 551
 552 static const struct atNBPtuple *
 553 nbp_name_print(netdissect_options *ndo,
 554                const struct atNBPtuple *tp, const u_char *ep)
 555 {
 556         const u_char *cp = (const u_char *)tp + nbpTupleSize;
 557
 558         ND_PRINT(" ");
 559
 560         /* Object */
 561         ND_PRINT("\"");
 562         if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 563                 /* Type */
 564                 ND_PRINT(":");
 565                 if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 566                         /* Zone */
 567                         ND_PRINT("@");
 568                         if ((cp = print_cstring(ndo, cp, ep)) != NULL)
 569                                 ND_PRINT("\"");
 570                 }
 571         }
 572         return ((const struct atNBPtuple *)cp);
 573 }
 574
 575
 576 #define HASHNAMESIZE 4096
 577
 578 struct hnamemem {
 579         u_int addr;
 580         char *name;
 581         struct hnamemem *nxt;
 582 };
 583
 584 static struct hnamemem hnametable[HASHNAMESIZE];
 585
 586 static const char *
 587 ataddr_string(netdissect_options *ndo,
 588               u_short atnet, u_char athost)
 589 {
 590         struct hnamemem *tp, *tp2;
 591         u_int i = (atnet << 8) | athost;
 592         char nambuf[256+1];
 593         static int first = 1;
 594         FILE *fp;
 595
 596         /*
 597          * Are we doing address to name resolution?
 598          */
 599         if (!ndo->ndo_nflag) {
 600                 /*
 601                  * Yes.  Have we tried to open and read an AppleTalk
 602                  * number to name map file?
 603                  */
 604                 if (!first) {
 605                         /*
 606                          * No; try to do so.
 607                          */
 608                         first = 0;
 609                         fp = fopen("/etc/atalk.names", "r");
 610                         if (fp != NULL) {
 611                                 char line[256];
 612                                 u_int i1, i2;
 613
 614                                 while (fgets(line, sizeof(line), fp)) {
 615                                         if (line[0] == '\n' || line[0] == 0 ||
 616                                             line[0] == '#')
 617                                                 continue;
 618                                         if (sscanf(line, "%u.%u %256s", &i1,
 619                                             &i2, nambuf) == 3)
 620                                                 /* got a hostname. */
 621                                                 i2 |= (i1 << 8);
 622                                         else if (sscanf(line, "%u %256s", &i1,
 623                                             nambuf) == 2)
 624                                                 /* got a net name */
 625                                                 i2 = (i1 << 8) | 255;
 626                                         else
 627                                                 continue;
 628
 629                                         for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
 630                                              tp->nxt; tp = tp->nxt)
 631                                                 ;
 632                                         tp->addr = i2;
 633                                         tp->nxt = newhnamemem(ndo);
 634                                         tp->name = strdup(nambuf);
 635                                         if (tp->name == NULL)
 636                                                 (*ndo->ndo_error)(ndo,
 637                                                     S_ERR_ND_MEM_ALLOC,
 638                                                     "ataddr_string: strdup(nambuf)");
 639                                 }
 640                                 fclose(fp);
 641                         }
 642                 }
 643         }
 644
 645         /*
 646          * Now try to look up the address in the table.
 647          */
 648         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 649                 if (tp->addr == i)
 650                         return (tp->name);
 651
 652         /* didn't have the node name -- see if we've got the net name */
 653         i |= 255;
 654         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 655                 if (tp2->addr == i) {
 656                         tp->addr = (atnet << 8) | athost;
 657                         tp->nxt = newhnamemem(ndo);
 658                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%u",
 659                             tp2->name, athost);
 660                         tp->name = strdup(nambuf);
 661                         if (tp->name == NULL)
 662                                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 663                                         "ataddr_string: strdup(nambuf)");
 664                         return (tp->name);
 665                 }
 666
 667         tp->addr = (atnet << 8) | athost;
 668         tp->nxt = newhnamemem(ndo);
 669         if (athost != 255)
 670                 (void)snprintf(nambuf, sizeof(nambuf), "%u.%u", atnet, athost);
 671         else
 672                 (void)snprintf(nambuf, sizeof(nambuf), "%u", atnet);
 673         tp->name = strdup(nambuf);
 674         if (tp->name == NULL)
 675                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 676                                   "ataddr_string: strdup(nambuf)");
 677
 678         return (tp->name);
 679 }
 680
 681 static const struct tok skt2str[] = {
 682         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 683         { nbpSkt,       "nis" },        /* name info socket */
 684         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 685         { zipSkt,       "zip" },        /* zone info protocol */
 686         { 0,            NULL }
 687 };
 688
 689 static const char *
 690 ddpskt_string(netdissect_options *ndo,
 691               u_int skt)
 692 {
 693         static char buf[8];
 694
 695         if (ndo->ndo_nflag) {
 696                 (void)snprintf(buf, sizeof(buf), "%u", skt);
 697                 return (buf);
 698         }
 699         return (tok2str(skt2str, "%u", skt));
 700 }