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 #include <config.h>
  25
  26 #include "netdissect-stdinc.h"
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 #include "netdissect.h"
  32 #include "addrtoname.h"
  33 #include "ethertype.h"
  34 #include "extract.h"
  35 #include "appletalk.h"
  36
  37
  38 static const struct tok type2str[] = {
  39         { ddpRTMP,              "rtmp" },
  40         { ddpRTMPrequest,       "rtmpReq" },
  41         { ddpECHO,              "echo" },
  42         { ddpIP,                "IP" },
  43         { ddpARP,               "ARP" },
  44         { ddpKLAP,              "KLAP" },
  45         { 0,                    NULL }
  46 };
  47
  48 struct aarp {
  49         nd_uint16_t     htype, ptype;
  50         nd_uint8_t      halen, palen;
  51         nd_uint16_t     op;
  52         nd_mac_addr     hsaddr;
  53         uint8_t         psaddr[4];
  54         nd_mac_addr     hdaddr;
  55         uint8_t         pdaddr[4];
  56 };
  57
  58 static void atp_print(netdissect_options *, const struct atATP *, u_int);
  59 static void atp_bitmap_print(netdissect_options *, u_char);
  60 static void nbp_print(netdissect_options *, const struct atNBP *, u_int, u_short, u_char, u_char);
  61 static const struct atNBPtuple *nbp_tuple_print(netdissect_options *ndo, const struct atNBPtuple *,
  62                                                 const u_char *,
  63                                                 u_short, u_char, u_char);
  64 static const struct atNBPtuple *nbp_name_print(netdissect_options *, const struct atNBPtuple *,
  65                                                const u_char *);
  66 static const char *ataddr_string(netdissect_options *, u_short, u_char);
  67 static void ddp_print(netdissect_options *, const u_char *, u_int, u_int, u_short, u_char, u_char);
  68 static const char *ddpskt_string(netdissect_options *, u_int);
  69
  70 /*
  71  * Print LLAP packets received on a physical LocalTalk interface.
  72  */
  73 void
  74 ltalk_if_print(netdissect_options *ndo,
  75                const struct pcap_pkthdr *h, const u_char *p)
  76 {
  77         u_int hdrlen;
  78
  79         ndo->ndo_protocol = "ltalk";
  80         hdrlen = llap_print(ndo, p, h->len);
  81         if (hdrlen == 0) {
  82                 /* Cut short by the snapshot length. */
  83                 ndo->ndo_ll_hdr_len += h->caplen;
  84                 return;
  85         }
  86         ndo->ndo_ll_hdr_len += hdrlen;
  87 }
  88
  89 /*
  90  * Print AppleTalk LLAP packets.
  91  */
  92 u_int
  93 llap_print(netdissect_options *ndo,
  94            const u_char *bp, u_int length)
  95 {
  96         const struct LAP *lp;
  97         const struct atDDP *dp;
  98         const struct atShortDDP *sdp;
  99         u_short snet;
 100         u_int hdrlen;
 101
 102         ndo->ndo_protocol = "llap";
 103         if (length < sizeof(*lp)) {
 104                 ND_PRINT(" [|llap %u]", length);
 105                 return (length);
 106         }
 107         if (!ND_TTEST_LEN(bp, sizeof(*lp))) {
 108                 nd_print_trunc(ndo);
 109                 return (0);     /* cut short by the snapshot length */
 110         }
 111         lp = (const struct LAP *)bp;
 112         bp += sizeof(*lp);
 113         length -= sizeof(*lp);
 114         hdrlen = sizeof(*lp);
 115         switch (GET_U_1(lp->type)) {
 116
 117         case lapShortDDP:
 118                 if (length < ddpSSize) {
 119                         ND_PRINT(" [|sddp %u]", length);
 120                         return (length);
 121                 }
 122                 if (!ND_TTEST_LEN(bp, ddpSSize)) {
 123                         ND_PRINT(" [|sddp]");
 124                         return (0);     /* cut short by the snapshot length */
 125                 }
 126                 sdp = (const struct atShortDDP *)bp;
 127                 ND_PRINT("%s.%s",
 128                     ataddr_string(ndo, 0, GET_U_1(lp->src)),
 129                     ddpskt_string(ndo, GET_U_1(sdp->srcSkt)));
 130                 ND_PRINT(" > %s.%s:",
 131                     ataddr_string(ndo, 0, GET_U_1(lp->dst)),
 132                     ddpskt_string(ndo, GET_U_1(sdp->dstSkt)));
 133                 bp += ddpSSize;
 134                 length -= ddpSSize;
 135                 hdrlen += ddpSSize;
 136                 ddp_print(ndo, bp, length, GET_U_1(sdp->type), 0,
 137                           GET_U_1(lp->src), GET_U_1(sdp->srcSkt));
 138                 break;
 139
 140         case lapDDP:
 141                 if (length < ddpSize) {
 142                         ND_PRINT(" [|ddp %u]", length);
 143                         return (length);
 144                 }
 145                 if (!ND_TTEST_LEN(bp, ddpSize)) {
 146                         ND_PRINT(" [|ddp]");
 147                         return (0);     /* cut short by the snapshot length */
 148                 }
 149                 dp = (const struct atDDP *)bp;
 150                 snet = GET_BE_U_2(dp->srcNet);
 151                 ND_PRINT("%s.%s",
 152                          ataddr_string(ndo, snet, GET_U_1(dp->srcNode)),
 153                          ddpskt_string(ndo, GET_U_1(dp->srcSkt)));
 154                 ND_PRINT(" > %s.%s:",
 155                     ataddr_string(ndo, GET_BE_U_2(dp->dstNet), GET_U_1(dp->dstNode)),
 156                     ddpskt_string(ndo, GET_U_1(dp->dstSkt)));
 157                 bp += ddpSize;
 158                 length -= ddpSize;
 159                 hdrlen += ddpSize;
 160                 ddp_print(ndo, bp, length, GET_U_1(dp->type), snet,
 161                           GET_U_1(dp->srcNode), GET_U_1(dp->srcSkt));
 162                 break;
 163
 164 #ifdef notdef
 165         case lapKLAP:
 166                 klap_print(bp, length);
 167                 break;
 168 #endif
 169
 170         default:
 171                 ND_PRINT("%u > %u at-lap#%u %u",
 172                     GET_U_1(lp->src), GET_U_1(lp->dst), GET_U_1(lp->type),
 173                     length);
 174                 break;
 175         }
 176         return (hdrlen);
 177 }
 178
 179 /*
 180  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 181  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 182  * packets in them).
 183  */
 184 void
 185 atalk_print(netdissect_options *ndo,
 186             const u_char *bp, u_int length)
 187 {
 188         const struct atDDP *dp;
 189         u_short snet;
 190
 191         ndo->ndo_protocol = "atalk";
 192         if(!ndo->ndo_eflag)
 193             ND_PRINT("AT ");
 194
 195         if (length < ddpSize) {
 196                 ND_PRINT(" [|ddp %u]", length);
 197                 return;
 198         }
 199         if (!ND_TTEST_LEN(bp, ddpSize)) {
 200                 ND_PRINT(" [|ddp]");
 201                 return;
 202         }
 203         dp = (const struct atDDP *)bp;
 204         snet = GET_BE_U_2(dp->srcNet);
 205         ND_PRINT("%s.%s", ataddr_string(ndo, snet, GET_U_1(dp->srcNode)),
 206                  ddpskt_string(ndo, GET_U_1(dp->srcSkt)));
 207         ND_PRINT(" > %s.%s: ",
 208                ataddr_string(ndo, GET_BE_U_2(dp->dstNet), GET_U_1(dp->dstNode)),
 209                ddpskt_string(ndo, GET_U_1(dp->dstSkt)));
 210         bp += ddpSize;
 211         length -= ddpSize;
 212         ddp_print(ndo, bp, length, GET_U_1(dp->type), snet,
 213                   GET_U_1(dp->srcNode), GET_U_1(dp->srcSkt));
 214 }
 215
 216 /* XXX should probably pass in the snap header and do checks like arp_print() */
 217 void
 218 aarp_print(netdissect_options *ndo,
 219            const u_char *bp, u_int length)
 220 {
 221         const struct aarp *ap;
 222
 223 #define AT(member) ataddr_string(ndo, (ap->member[1]<<8)|ap->member[2],ap->member[3])
 224
 225         ndo->ndo_protocol = "aarp";
 226         ND_PRINT("aarp ");
 227         ap = (const struct aarp *)bp;
 228         if (!ND_TTEST_SIZE(ap)) {
 229                 /* Just bail if we don't have the whole chunk. */
 230                 nd_print_trunc(ndo);
 231                 return;
 232         }
 233         if (length < sizeof(*ap)) {
 234                 ND_PRINT(" [|aarp %u]", length);
 235                 return;
 236         }
 237         if (GET_BE_U_2(ap->htype) == 1 &&
 238             GET_BE_U_2(ap->ptype) == ETHERTYPE_ATALK &&
 239             GET_U_1(ap->halen) == MAC_ADDR_LEN && GET_U_1(ap->palen) == 4)
 240                 switch (GET_BE_U_2(ap->op)) {
 241
 242                 case 1:                         /* request */
 243                         ND_PRINT("who-has %s tell %s", AT(pdaddr), AT(psaddr));
 244                         return;
 245
 246                 case 2:                         /* response */
 247                         ND_PRINT("reply %s is-at %s", AT(psaddr), GET_ETHERADDR_STRING(ap->hsaddr));
 248                         return;
 249
 250                 case 3:                         /* probe (oy!) */
 251                         ND_PRINT("probe %s tell %s", AT(pdaddr), AT(psaddr));
 252                         return;
 253                 }
 254         ND_PRINT("len %u op %u htype %u ptype %#x halen %u palen %u",
 255             length, GET_BE_U_2(ap->op), GET_BE_U_2(ap->htype),
 256             GET_BE_U_2(ap->ptype), GET_U_1(ap->halen), GET_U_1(ap->palen));
 257 }
 258
 259 /*
 260  * Print AppleTalk Datagram Delivery Protocol packets.
 261  */
 262 static void
 263 ddp_print(netdissect_options *ndo,
 264           const u_char *bp, u_int length, u_int t,
 265           u_short snet, u_char snode, u_char skt)
 266 {
 267
 268         switch (t) {
 269
 270         case ddpNBP:
 271                 nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
 272                 break;
 273
 274         case ddpATP:
 275                 atp_print(ndo, (const struct atATP *)bp, length);
 276                 break;
 277
 278         case ddpEIGRP:
 279                 eigrp_print(ndo, bp, length);
 280                 break;
 281
 282         default:
 283                 ND_PRINT(" at-%s %u", tok2str(type2str, NULL, t), length);
 284                 break;
 285         }
 286 }
 287
 288 static void
 289 atp_print(netdissect_options *ndo,
 290           const struct atATP *ap, u_int length)
 291 {
 292         uint8_t control;
 293         uint32_t data;
 294
 295         if ((const u_char *)(ap + 1) > ndo->ndo_snapend) {
 296                 /* Just bail if we don't have the whole chunk. */
 297                 nd_print_trunc(ndo);
 298                 return;
 299         }
 300         if (length < sizeof(*ap)) {
 301                 ND_PRINT(" [|atp %u]", length);
 302                 return;
 303         }
 304         length -= sizeof(*ap);
 305         control = GET_U_1(ap->control);
 306         switch (control & 0xc0) {
 307
 308         case atpReqCode:
 309                 ND_PRINT(" atp-req%s %u",
 310                              control & atpXO? " " : "*",
 311                              GET_BE_U_2(ap->transID));
 312
 313                 atp_bitmap_print(ndo, GET_U_1(ap->bitmap));
 314
 315                 if (length != 0)
 316                         ND_PRINT(" [len=%u]", length);
 317
 318                 switch (control & (atpEOM|atpSTS)) {
 319                 case atpEOM:
 320                         ND_PRINT(" [EOM]");
 321                         break;
 322                 case atpSTS:
 323                         ND_PRINT(" [STS]");
 324                         break;
 325                 case atpEOM|atpSTS:
 326                         ND_PRINT(" [EOM,STS]");
 327                         break;
 328                 }
 329                 break;
 330
 331         case atpRspCode:
 332                 ND_PRINT(" atp-resp%s%u:%u (%u)",
 333                              control & atpEOM? "*" : " ",
 334                              GET_BE_U_2(ap->transID), GET_U_1(ap->bitmap),
 335                              length);
 336                 switch (control & (atpXO|atpSTS)) {
 337                 case atpXO:
 338                         ND_PRINT(" [XO]");
 339                         break;
 340                 case atpSTS:
 341                         ND_PRINT(" [STS]");
 342                         break;
 343                 case atpXO|atpSTS:
 344                         ND_PRINT(" [XO,STS]");
 345                         break;
 346                 }
 347                 break;
 348
 349         case atpRelCode:
 350                 ND_PRINT(" atp-rel  %u", GET_BE_U_2(ap->transID));
 351
 352                 atp_bitmap_print(ndo, GET_U_1(ap->bitmap));
 353
 354                 /* length should be zero */
 355                 if (length)
 356                         ND_PRINT(" [len=%u]", length);
 357
 358                 /* there shouldn't be any control flags */
 359                 if (control & (atpXO|atpEOM|atpSTS)) {
 360                         char c = '[';
 361                         if (control & atpXO) {
 362                                 ND_PRINT("%cXO", c);
 363                                 c = ',';
 364                         }
 365                         if (control & atpEOM) {
 366                                 ND_PRINT("%cEOM", c);
 367                                 c = ',';
 368                         }
 369                         if (control & atpSTS) {
 370                                 ND_PRINT("%cSTS", c);
 371                         }
 372                         ND_PRINT("]");
 373                 }
 374                 break;
 375
 376         default:
 377                 ND_PRINT(" atp-0x%x  %u (%u)", control,
 378                              GET_BE_U_2(ap->transID), length);
 379                 break;
 380         }
 381         data = GET_BE_U_4(ap->userData);
 382         if (data != 0)
 383                 ND_PRINT(" 0x%x", data);
 384 }
 385
 386 static void
 387 atp_bitmap_print(netdissect_options *ndo,
 388                  u_char bm)
 389 {
 390         u_int i;
 391
 392         /*
 393          * The '& 0xff' below is needed for compilers that want to sign
 394          * extend a u_char, which is the case with the Ultrix compiler.
 395          * (gcc is smart enough to eliminate it, at least on the Sparc).
 396          */
 397         if ((bm + 1) & (bm & 0xff)) {
 398                 char c = '<';
 399                 for (i = 0; bm; ++i) {
 400                         if (bm & 1) {
 401                                 ND_PRINT("%c%u", c, i);
 402                                 c = ',';
 403                         }
 404                         bm >>= 1;
 405                 }
 406                 ND_PRINT(">");
 407         } else {
 408                 for (i = 0; bm; ++i)
 409                         bm >>= 1;
 410                 if (i > 1)
 411                         ND_PRINT("<0-%u>", i - 1);
 412                 else
 413                         ND_PRINT("<0>");
 414         }
 415 }
 416
 417 static void
 418 nbp_print(netdissect_options *ndo,
 419           const struct atNBP *np, u_int length, u_short snet,
 420           u_char snode, u_char skt)
 421 {
 422         const struct atNBPtuple *tp =
 423                 (const struct atNBPtuple *)((const u_char *)np + nbpHeaderSize);
 424         uint8_t control;
 425         u_int i;
 426         const u_char *ep;
 427
 428         if (length < nbpHeaderSize) {
 429                 ND_PRINT(" truncated-nbp %u", length);
 430                 return;
 431         }
 432
 433         length -= nbpHeaderSize;
 434         if (length < 8) {
 435                 /* must be room for at least one tuple */
 436                 ND_PRINT(" truncated-nbp %u", length + nbpHeaderSize);
 437                 return;
 438         }
 439         /* ep points to end of available data */
 440         ep = ndo->ndo_snapend;
 441         if ((const u_char *)tp > ep) {
 442                 nd_print_trunc(ndo);
 443                 return;
 444         }
 445         control = GET_U_1(np->control);
 446         switch (i = (control & 0xf0)) {
 447
 448         case nbpBrRq:
 449         case nbpLkUp:
 450                 ND_PRINT(i == nbpLkUp? " nbp-lkup %u:":" nbp-brRq %u:",
 451                          GET_U_1(np->id));
 452                 if ((const u_char *)(tp + 1) > ep) {
 453                         nd_print_trunc(ndo);
 454                         return;
 455                 }
 456                 (void)nbp_name_print(ndo, tp, ep);
 457                 /*
 458                  * look for anomalies: the spec says there can only
 459                  * be one tuple, the address must match the source
 460                  * address and the enumerator should be zero.
 461                  */
 462                 if ((control & 0xf) != 1)
 463                         ND_PRINT(" [ntup=%u]", control & 0xf);
 464                 if (GET_U_1(tp->enumerator))
 465                         ND_PRINT(" [enum=%u]", GET_U_1(tp->enumerator));
 466                 if (GET_BE_U_2(tp->net) != snet ||
 467                     GET_U_1(tp->node) != snode ||
 468                     GET_U_1(tp->skt) != skt)
 469                         ND_PRINT(" [addr=%s.%u]",
 470                             ataddr_string(ndo, GET_BE_U_2(tp->net),
 471                                           GET_U_1(tp->node)),
 472                             GET_U_1(tp->skt));
 473                 break;
 474
 475         case nbpLkUpReply:
 476                 ND_PRINT(" nbp-reply %u:", GET_U_1(np->id));
 477
 478                 /* print each of the tuples in the reply */
 479                 for (i = control & 0xf; i != 0 && tp; i--)
 480                         tp = nbp_tuple_print(ndo, tp, ep, snet, snode, skt);
 481                 break;
 482
 483         default:
 484                 ND_PRINT(" nbp-0x%x  %u (%u)", control, GET_U_1(np->id),
 485                          length);
 486                 break;
 487         }
 488 }
 489
 490 /* print a counted string */
 491 static const u_char *
 492 print_cstring(netdissect_options *ndo,
 493               const u_char *cp, const u_char *ep)
 494 {
 495         u_int length;
 496
 497         if (cp >= ep) {
 498                 nd_print_trunc(ndo);
 499                 return (0);
 500         }
 501         length = GET_U_1(cp);
 502         cp++;
 503
 504         /* Spec says string can be at most 32 bytes long */
 505         if (length > 32) {
 506                 ND_PRINT("[len=%u]", length);
 507                 return (0);
 508         }
 509         while (length != 0) {
 510                 if (cp >= ep) {
 511                         nd_print_trunc(ndo);
 512                         return (0);
 513                 }
 514                 fn_print_char(ndo, GET_U_1(cp));
 515                 cp++;
 516                 length--;
 517         }
 518         return (cp);
 519 }
 520
 521 static const struct atNBPtuple *
 522 nbp_tuple_print(netdissect_options *ndo,
 523                 const struct atNBPtuple *tp, const u_char *ep,
 524                 u_short snet, u_char snode, u_char skt)
 525 {
 526         const struct atNBPtuple *tpn;
 527
 528         if ((const u_char *)(tp + 1) > ep) {
 529                 nd_print_trunc(ndo);
 530                 return 0;
 531         }
 532         tpn = nbp_name_print(ndo, tp, ep);
 533
 534         /* if the enumerator isn't 1, print it */
 535         if (GET_U_1(tp->enumerator) != 1)
 536                 ND_PRINT("(%u)", GET_U_1(tp->enumerator));
 537
 538         /* if the socket doesn't match the src socket, print it */
 539         if (GET_U_1(tp->skt) != skt)
 540                 ND_PRINT(" %u", GET_U_1(tp->skt));
 541
 542         /* if the address doesn't match the src address, it's an anomaly */
 543         if (GET_BE_U_2(tp->net) != snet ||
 544             GET_U_1(tp->node) != snode)
 545                 ND_PRINT(" [addr=%s]",
 546                     ataddr_string(ndo, GET_BE_U_2(tp->net), GET_U_1(tp->node)));
 547
 548         return (tpn);
 549 }
 550
 551 static const struct atNBPtuple *
 552 nbp_name_print(netdissect_options *ndo,
 553                const struct atNBPtuple *tp, const u_char *ep)
 554 {
 555         const u_char *cp = (const u_char *)tp + nbpTupleSize;
 556
 557         ND_PRINT(" ");
 558
 559         /* Object */
 560         ND_PRINT("\"");
 561         if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 562                 /* Type */
 563                 ND_PRINT(":");
 564                 if ((cp = print_cstring(ndo, cp, ep)) != NULL) {
 565                         /* Zone */
 566                         ND_PRINT("@");
 567                         if ((cp = print_cstring(ndo, cp, ep)) != NULL)
 568                                 ND_PRINT("\"");
 569                 }
 570         }
 571         return ((const struct atNBPtuple *)cp);
 572 }
 573
 574
 575 #define HASHNAMESIZE 4096
 576
 577 struct hnamemem {
 578         u_int addr;
 579         char *name;
 580         struct hnamemem *nxt;
 581 };
 582
 583 static struct hnamemem hnametable[HASHNAMESIZE];
 584
 585 static const char *
 586 ataddr_string(netdissect_options *ndo,
 587               u_short atnet, u_char athost)
 588 {
 589         struct hnamemem *tp, *tp2;
 590         u_int i = (atnet << 8) | athost;
 591         char nambuf[256+1];
 592         static int first = 1;
 593         FILE *fp;
 594
 595         /*
 596          * Are we doing address to name resolution?
 597          */
 598         if (!ndo->ndo_nflag) {
 599                 /*
 600                  * Yes.  Have we tried to open and read an AppleTalk
 601                  * number to name map file?
 602                  */
 603                 if (!first) {
 604                         /*
 605                          * No; try to do so.
 606                          */
 607                         first = 0;
 608                         fp = fopen("/etc/atalk.names", "r");
 609                         if (fp != NULL) {
 610                                 char line[256];
 611                                 u_int i1, i2;
 612
 613                                 while (fgets(line, sizeof(line), fp)) {
 614                                         if (line[0] == '\n' || line[0] == 0 ||
 615                                             line[0] == '#')
 616                                                 continue;
 617                                         if (sscanf(line, "%u.%u %256s", &i1,
 618                                             &i2, nambuf) == 3)
 619                                                 /* got a hostname. */
 620                                                 i2 |= (i1 << 8);
 621                                         else if (sscanf(line, "%u %256s", &i1,
 622                                             nambuf) == 2)
 623                                                 /* got a net name */
 624                                                 i2 = (i1 << 8) | 255;
 625                                         else
 626                                                 continue;
 627
 628                                         for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
 629                                              tp->nxt; tp = tp->nxt)
 630                                                 ;
 631                                         tp->addr = i2;
 632                                         tp->nxt = newhnamemem(ndo);
 633                                         tp->name = strdup(nambuf);
 634                                         if (tp->name == NULL)
 635                                                 (*ndo->ndo_error)(ndo,
 636                                                     S_ERR_ND_MEM_ALLOC,
 637                                                     "%s: strdup(nambuf)", __func__);
 638                                 }
 639                                 fclose(fp);
 640                         }
 641                 }
 642         }
 643
 644         /*
 645          * Now try to look up the address in the table.
 646          */
 647         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 648                 if (tp->addr == i)
 649                         return (tp->name);
 650
 651         /* didn't have the node name -- see if we've got the net name */
 652         i |= 255;
 653         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 654                 if (tp2->addr == i) {
 655                         tp->addr = (atnet << 8) | athost;
 656                         tp->nxt = newhnamemem(ndo);
 657                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%u",
 658                             tp2->name, athost);
 659                         tp->name = strdup(nambuf);
 660                         if (tp->name == NULL)
 661                                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 662                                         "%s: strdup(nambuf)", __func__);
 663                         return (tp->name);
 664                 }
 665
 666         tp->addr = (atnet << 8) | athost;
 667         tp->nxt = newhnamemem(ndo);
 668         if (athost != 255)
 669                 (void)snprintf(nambuf, sizeof(nambuf), "%u.%u", atnet, athost);
 670         else
 671                 (void)snprintf(nambuf, sizeof(nambuf), "%u", atnet);
 672         tp->name = strdup(nambuf);
 673         if (tp->name == NULL)
 674                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 675                                   "%s: strdup(nambuf)", __func__);
 676
 677         return (tp->name);
 678 }
 679
 680 static const struct tok skt2str[] = {
 681         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 682         { nbpSkt,       "nis" },        /* name info socket */
 683         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 684         { zipSkt,       "zip" },        /* zone info protocol */
 685         { 0,            NULL }
 686 };
 687
 688 static const char *
 689 ddpskt_string(netdissect_options *ndo,
 690               u_int skt)
 691 {
 692         static char buf[8];
 693
 694         if (ndo->ndo_nflag) {
 695                 (void)snprintf(buf, sizeof(buf), "%u", skt);
 696                 return (buf);
 697         }
 698         return (tok2str(skt2str, "%u", skt));
 699 }