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 #define ND_LONGJMP_FROM_TCHECK
  34 #include "netdissect.h"
  35 #include "addrtoname.h"
  36 #include "ethertype.h"
  37 #include "extract.h"
  38 #include "appletalk.h"
  39
  40 /* Datagram Delivery Protocol */
  41
  42 struct atDDP {
  43         nd_uint16_t     length;
  44         nd_uint16_t     checksum;
  45         nd_uint16_t     dstNet;
  46         nd_uint16_t     srcNet;
  47         nd_uint8_t      dstNode;
  48         nd_uint8_t      srcNode;
  49         nd_uint8_t      dstSkt;
  50         nd_uint8_t      srcSkt;
  51         nd_uint8_t      type;
  52 };
  53 #define ddpSize         13
  54
  55 struct atShortDDP {
  56         nd_uint16_t     length;
  57         nd_uint8_t      dstSkt;
  58         nd_uint8_t      srcSkt;
  59         nd_uint8_t      type;
  60 };
  61 #define ddpSSize        5
  62
  63 /* AppleTalk Transaction Protocol */
  64
  65 struct atATP {
  66         nd_uint8_t      control;
  67         nd_uint8_t      bitmap;
  68         nd_uint16_t     transID;
  69         nd_uint32_t     userData;
  70 };
  71
  72 #define atpReqCode      0x40
  73 #define atpRspCode      0x80
  74 #define atpRelCode      0xC0
  75 #define atpXO           0x20
  76 #define atpEOM          0x10
  77 #define atpSTS          0x08
  78
  79 /* Name Binding Protocol */
  80
  81 struct atNBP {
  82         nd_uint8_t      control;
  83         nd_uint8_t      id;
  84 };
  85 #define nbpHeaderSize   2
  86
  87 struct atNBPtuple {
  88         nd_uint16_t     net;
  89         nd_uint8_t      node;
  90         nd_uint8_t      skt;
  91         nd_uint8_t      enumerator;
  92 };
  93 #define nbpTupleSize    5
  94
  95 #define nbpBrRq         0x10
  96 #define nbpLkUp         0x20
  97 #define nbpLkUpReply    0x30
  98 static const struct tok nbp_str[] = {
  99         { nbpBrRq,      "brRq"  },
 100         { nbpLkUp,      "lkup"  },
 101         { nbpLkUpReply, "reply" },
 102         { 0, NULL }
 103 };
 104
 105 #define ddpRTMP         1       /* RTMP type */
 106 #define ddpNBP          2       /* NBP type */
 107 #define ddpATP          3       /* ATP type */
 108 #define ddpECHO         4       /* ECHO type */
 109 #define ddpRTMPrequest  5       /* RTMP request type */
 110 #define ddpIP           22      /* IP type */
 111 #define ddpARP          23      /* ARP type */
 112 #define ddpKLAP         0x4b    /* Kinetics KLAP type */
 113 #define ddpEIGRP        88      /* EIGRP over Appletalk */
 114 static const struct tok type2str[] = {
 115         { ddpRTMP,              "rtmp" },
 116         { ddpRTMPrequest,       "rtmpReq" },
 117         { ddpECHO,              "echo" },
 118         { ddpIP,                "IP" },
 119         { ddpARP,               "ARP" },
 120         { ddpKLAP,              "KLAP" },
 121         { 0,                    NULL }
 122 };
 123
 124 struct aarp {
 125         nd_uint16_t     htype, ptype;
 126         nd_uint8_t      halen, palen;
 127         nd_uint16_t     op;
 128         nd_mac_addr     hsaddr;
 129         uint8_t         psaddr[4];
 130         nd_mac_addr     hdaddr;
 131         uint8_t         pdaddr[4];
 132 };
 133
 134 static void atp_print(netdissect_options *, const struct atATP *, u_int);
 135 static void atp_bitmap_print(netdissect_options *, u_char);
 136 static void nbp_print(netdissect_options *, const struct atNBP *, u_int, u_short, u_char, u_char);
 137 static const struct atNBPtuple *nbp_tuple_print(netdissect_options *ndo, const struct atNBPtuple *,
 138                                                 u_short, u_char, u_char);
 139 static const struct atNBPtuple *nbp_name_print(netdissect_options *, const struct atNBPtuple *);
 140 static const char *ataddr_string(netdissect_options *, u_short, u_char);
 141 static void ddp_print(netdissect_options *, const u_char *, u_int, u_int, u_short, u_char, u_char);
 142 static const char *ddpskt_string(netdissect_options *, u_int);
 143
 144 /*
 145  * Print LLAP packets received on a physical LocalTalk interface.
 146  */
 147 void
 148 ltalk_if_print(netdissect_options *ndo,
 149                const struct pcap_pkthdr *h, const u_char *p)
 150 {
 151         ndo->ndo_protocol = "ltalk";
 152         ndo->ndo_ll_hdr_len += llap_print(ndo, p, h->len);
 153 }
 154
 155 /*
 156  * Print AppleTalk LLAP packets.
 157  */
 158 u_int
 159 llap_print(netdissect_options *ndo,
 160            const u_char *bp, u_int length)
 161 {
 162         const struct LAP *lp;
 163         const struct atDDP *dp;
 164         const struct atShortDDP *sdp;
 165         u_short snet;
 166         u_int hdrlen;
 167
 168         ndo->ndo_protocol = "llap";
 169         if (length < sizeof(*lp)) {
 170                 ND_PRINT(" (LLAP length %u is too small)", length);
 171                 goto invalid;
 172         }
 173         lp = (const struct LAP *)bp;
 174         bp += sizeof(*lp);
 175         length -= sizeof(*lp);
 176         hdrlen = sizeof(*lp);
 177         switch (GET_U_1(lp->type)) {
 178
 179         case lapShortDDP:
 180                 ndo->ndo_protocol = "sddp";
 181                 if (length < ddpSSize) {
 182                         ND_PRINT(" (SDDP length %u is too small)", length);
 183                         goto invalid;
 184                 }
 185                 sdp = (const struct atShortDDP *)bp;
 186                 ND_PRINT("%s.%s",
 187                     ataddr_string(ndo, 0, GET_U_1(lp->src)),
 188                     ddpskt_string(ndo, GET_U_1(sdp->srcSkt)));
 189                 ND_PRINT(" > %s.%s:",
 190                     ataddr_string(ndo, 0, GET_U_1(lp->dst)),
 191                     ddpskt_string(ndo, GET_U_1(sdp->dstSkt)));
 192                 bp += ddpSSize;
 193                 length -= ddpSSize;
 194                 hdrlen += ddpSSize;
 195                 ddp_print(ndo, bp, length, GET_U_1(sdp->type), 0,
 196                           GET_U_1(lp->src), GET_U_1(sdp->srcSkt));
 197                 break;
 198
 199         case lapDDP:
 200                 ndo->ndo_protocol = "ddp";
 201                 if (length < ddpSize) {
 202                         ND_PRINT(" (DDP length %u is too small)", length);
 203                         goto invalid;
 204                 }
 205                 dp = (const struct atDDP *)bp;
 206                 snet = GET_BE_U_2(dp->srcNet);
 207                 ND_PRINT("%s.%s",
 208                          ataddr_string(ndo, snet, GET_U_1(dp->srcNode)),
 209                          ddpskt_string(ndo, GET_U_1(dp->srcSkt)));
 210                 ND_PRINT(" > %s.%s:",
 211                     ataddr_string(ndo, GET_BE_U_2(dp->dstNet), GET_U_1(dp->dstNode)),
 212                     ddpskt_string(ndo, GET_U_1(dp->dstSkt)));
 213                 bp += ddpSize;
 214                 length -= ddpSize;
 215                 hdrlen += ddpSize;
 216                 ddp_print(ndo, bp, length, GET_U_1(dp->type), snet,
 217                           GET_U_1(dp->srcNode), GET_U_1(dp->srcSkt));
 218                 break;
 219
 220         default:
 221                 ND_PRINT("%u > %u at-lap#%u %u",
 222                     GET_U_1(lp->src), GET_U_1(lp->dst), GET_U_1(lp->type),
 223                     length);
 224                 break;
 225         }
 226         return (hdrlen);
 227 invalid:
 228         nd_print_invalid(ndo);
 229         return length;
 230 }
 231
 232 /*
 233  * Print EtherTalk/TokenTalk packets (or FDDITalk, or whatever it's called
 234  * when it runs over FDDI; yes, I've seen FDDI captures with AppleTalk
 235  * packets in them).
 236  */
 237 void
 238 atalk_print(netdissect_options *ndo,
 239             const u_char *bp, u_int length)
 240 {
 241         const struct atDDP *dp;
 242         u_short snet;
 243
 244         ndo->ndo_protocol = "atalk";
 245         if(!ndo->ndo_eflag)
 246             ND_PRINT("AT ");
 247
 248         if (length < ddpSize) {
 249                 ND_PRINT(" (length %u is too small)", length);
 250                 goto invalid;
 251         }
 252         dp = (const struct atDDP *)bp;
 253         snet = GET_BE_U_2(dp->srcNet);
 254         ND_PRINT("%s.%s", ataddr_string(ndo, snet, GET_U_1(dp->srcNode)),
 255                  ddpskt_string(ndo, GET_U_1(dp->srcSkt)));
 256         ND_PRINT(" > %s.%s: ",
 257                ataddr_string(ndo, GET_BE_U_2(dp->dstNet), GET_U_1(dp->dstNode)),
 258                ddpskt_string(ndo, GET_U_1(dp->dstSkt)));
 259         bp += ddpSize;
 260         length -= ddpSize;
 261         ddp_print(ndo, bp, length, GET_U_1(dp->type), snet,
 262                   GET_U_1(dp->srcNode), GET_U_1(dp->srcSkt));
 263         return;
 264 invalid:
 265         nd_print_invalid(ndo);
 266 }
 267
 268 /* XXX should probably pass in the snap header and do checks like arp_print() */
 269 void
 270 aarp_print(netdissect_options *ndo,
 271            const u_char *bp, u_int length)
 272 {
 273         const struct aarp *ap;
 274
 275 #define AT(member) ataddr_string(ndo, \
 276         (GET_U_1(&ap->member[1])<<8)|GET_U_1(&ap->member[2]), \
 277         GET_U_1(&ap->member[3]))
 278
 279         ndo->ndo_protocol = "aarp";
 280         ND_PRINT("aarp ");
 281         ap = (const struct aarp *)bp;
 282         if (length < sizeof(*ap)) {
 283                 ND_PRINT(" (length %u is too small)", length);
 284                 goto invalid;
 285         }
 286         ND_TCHECK_SIZE(ap);
 287         if (GET_BE_U_2(ap->htype) == 1 &&
 288             GET_BE_U_2(ap->ptype) == ETHERTYPE_ATALK &&
 289             GET_U_1(ap->halen) == MAC_ADDR_LEN && GET_U_1(ap->palen) == 4)
 290                 switch (GET_BE_U_2(ap->op)) {
 291
 292                 case 1:                         /* request */
 293                         ND_PRINT("who-has %s tell %s", AT(pdaddr), AT(psaddr));
 294                         return;
 295
 296                 case 2:                         /* response */
 297                         ND_PRINT("reply %s is-at %s", AT(psaddr), GET_ETHERADDR_STRING(ap->hsaddr));
 298                         return;
 299
 300                 case 3:                         /* probe (oy!) */
 301                         ND_PRINT("probe %s tell %s", AT(pdaddr), AT(psaddr));
 302                         return;
 303                 }
 304         ND_PRINT("len %u op %u htype %u ptype %#x halen %u palen %u",
 305             length, GET_BE_U_2(ap->op), GET_BE_U_2(ap->htype),
 306             GET_BE_U_2(ap->ptype), GET_U_1(ap->halen), GET_U_1(ap->palen));
 307         return;
 308 invalid:
 309         nd_print_invalid(ndo);
 310 }
 311
 312 /*
 313  * Print AppleTalk Datagram Delivery Protocol packets.
 314  */
 315 static void
 316 ddp_print(netdissect_options *ndo,
 317           const u_char *bp, u_int length, u_int t,
 318           u_short snet, u_char snode, u_char skt)
 319 {
 320
 321         switch (t) {
 322
 323         case ddpNBP:
 324                 nbp_print(ndo, (const struct atNBP *)bp, length, snet, snode, skt);
 325                 break;
 326
 327         case ddpATP:
 328                 atp_print(ndo, (const struct atATP *)bp, length);
 329                 break;
 330
 331         case ddpEIGRP:
 332                 eigrp_print(ndo, bp, length);
 333                 break;
 334
 335         default:
 336                 ND_PRINT(" at-%s %u", tok2str(type2str, NULL, t), length);
 337                 break;
 338         }
 339 }
 340
 341 static void
 342 atp_print(netdissect_options *ndo,
 343           const struct atATP *ap, u_int length)
 344 {
 345         uint8_t control;
 346         uint32_t data;
 347
 348         ndo->ndo_protocol = "atp";
 349         if (length < sizeof(*ap)) {
 350                 ND_PRINT(" (ATP length %u is too small)", length);
 351                 goto invalid;
 352         }
 353         length -= sizeof(*ap);
 354         control = GET_U_1(ap->control);
 355         switch (control & 0xc0) {
 356
 357         case atpReqCode:
 358                 ND_PRINT(" atp-req%s %u",
 359                              control & atpXO? " " : "*",
 360                              GET_BE_U_2(ap->transID));
 361
 362                 atp_bitmap_print(ndo, GET_U_1(ap->bitmap));
 363
 364                 if (length != 0)
 365                         ND_PRINT(" [len=%u]", length);
 366
 367                 switch (control & (atpEOM|atpSTS)) {
 368                 case atpEOM:
 369                         ND_PRINT(" [EOM]");
 370                         break;
 371                 case atpSTS:
 372                         ND_PRINT(" [STS]");
 373                         break;
 374                 case atpEOM|atpSTS:
 375                         ND_PRINT(" [EOM,STS]");
 376                         break;
 377                 }
 378                 break;
 379
 380         case atpRspCode:
 381                 ND_PRINT(" atp-resp%s%u:%u (%u)",
 382                              control & atpEOM? "*" : " ",
 383                              GET_BE_U_2(ap->transID), GET_U_1(ap->bitmap),
 384                              length);
 385                 switch (control & (atpXO|atpSTS)) {
 386                 case atpXO:
 387                         ND_PRINT(" [XO]");
 388                         break;
 389                 case atpSTS:
 390                         ND_PRINT(" [STS]");
 391                         break;
 392                 case atpXO|atpSTS:
 393                         ND_PRINT(" [XO,STS]");
 394                         break;
 395                 }
 396                 break;
 397
 398         case atpRelCode:
 399                 ND_PRINT(" atp-rel  %u", GET_BE_U_2(ap->transID));
 400
 401                 atp_bitmap_print(ndo, GET_U_1(ap->bitmap));
 402
 403                 /* length should be zero */
 404                 if (length)
 405                         ND_PRINT(" [len=%u]", length);
 406
 407                 /* there shouldn't be any control flags */
 408                 if (control & (atpXO|atpEOM|atpSTS)) {
 409                         char c = '[';
 410                         if (control & atpXO) {
 411                                 ND_PRINT("%cXO", c);
 412                                 c = ',';
 413                         }
 414                         if (control & atpEOM) {
 415                                 ND_PRINT("%cEOM", c);
 416                                 c = ',';
 417                         }
 418                         if (control & atpSTS) {
 419                                 ND_PRINT("%cSTS", c);
 420                         }
 421                         ND_PRINT("]");
 422                 }
 423                 break;
 424
 425         default:
 426                 ND_PRINT(" atp-0x%x  %u (%u)", control,
 427                              GET_BE_U_2(ap->transID), length);
 428                 break;
 429         }
 430         data = GET_BE_U_4(ap->userData);
 431         if (data != 0)
 432                 ND_PRINT(" 0x%x", data);
 433         return;
 434 invalid:
 435         nd_print_invalid(ndo);
 436 }
 437
 438 static void
 439 atp_bitmap_print(netdissect_options *ndo,
 440                  u_char bm)
 441 {
 442         u_int i;
 443
 444         /*
 445          * The '& 0xff' below is needed for compilers that want to sign
 446          * extend a u_char, which is the case with the Ultrix compiler.
 447          * (gcc is smart enough to eliminate it, at least on the Sparc).
 448          */
 449         if ((bm + 1) & (bm & 0xff)) {
 450                 char c = '<';
 451                 for (i = 0; bm; ++i) {
 452                         if (bm & 1) {
 453                                 ND_PRINT("%c%u", c, i);
 454                                 c = ',';
 455                         }
 456                         bm >>= 1;
 457                 }
 458                 ND_PRINT(">");
 459         } else {
 460                 for (i = 0; bm; ++i)
 461                         bm >>= 1;
 462                 if (i > 1)
 463                         ND_PRINT("<0-%u>", i - 1);
 464                 else
 465                         ND_PRINT("<0>");
 466         }
 467 }
 468
 469 static void
 470 nbp_print(netdissect_options *ndo,
 471           const struct atNBP *np, u_int length, u_short snet,
 472           u_char snode, u_char skt)
 473 {
 474         const struct atNBPtuple *tp =
 475                 (const struct atNBPtuple *)((const u_char *)np + nbpHeaderSize);
 476         uint8_t control;
 477         u_int i;
 478
 479         if (length < nbpHeaderSize + 8) {
 480                 /* must be room for at least one tuple */
 481                 ND_PRINT(" undersized-nbp %u", length);
 482                 goto invalid;
 483         }
 484         length -= nbpHeaderSize;
 485         control = GET_U_1(np->control);
 486         ND_PRINT(" nbp-%s", tok2str(nbp_str, "0x%x", control & 0xf0));
 487         ND_PRINT(" %u", GET_U_1(np->id));
 488         switch (control & 0xf0) {
 489
 490         case nbpBrRq:
 491         case nbpLkUp:
 492                 ND_PRINT(":");
 493                 (void)nbp_name_print(ndo, tp);
 494                 /*
 495                  * look for anomalies: the spec says there can only
 496                  * be one tuple, the address must match the source
 497                  * address and the enumerator should be zero.
 498                  */
 499                 if ((control & 0xf) != 1)
 500                         ND_PRINT(" [ntup=%u]", control & 0xf);
 501                 if (GET_U_1(tp->enumerator))
 502                         ND_PRINT(" [enum=%u]", GET_U_1(tp->enumerator));
 503                 if (GET_BE_U_2(tp->net) != snet ||
 504                     GET_U_1(tp->node) != snode ||
 505                     GET_U_1(tp->skt) != skt)
 506                         ND_PRINT(" [addr=%s.%u]",
 507                             ataddr_string(ndo, GET_BE_U_2(tp->net),
 508                                           GET_U_1(tp->node)),
 509                             GET_U_1(tp->skt));
 510                 break;
 511
 512         case nbpLkUpReply:
 513                 ND_PRINT(":");
 514
 515                 /* print each of the tuples in the reply */
 516                 for (i = control & 0xf; i != 0 && tp; i--)
 517                         tp = nbp_tuple_print(ndo, tp, snet, snode, skt);
 518                 break;
 519
 520         default:
 521                 ND_PRINT("  (%u)", length);
 522                 break;
 523         }
 524         return;
 525 invalid:
 526         nd_print_invalid(ndo);
 527 }
 528
 529 /* print a counted string */
 530 static const u_char *
 531 print_cstring(netdissect_options *ndo,
 532               const u_char *cp)
 533 {
 534         u_int length;
 535
 536         length = GET_U_1(cp);
 537         cp++;
 538
 539         /* Spec says string can be at most 32 bytes long */
 540         if (length > 32) {
 541                 ND_PRINT("[len=%u]", length);
 542                 ND_TCHECK_LEN(cp, length);
 543                 return NULL;
 544         }
 545         nd_printjn(ndo, cp, length);
 546         return cp + length;
 547 }
 548
 549 static const struct atNBPtuple *
 550 nbp_tuple_print(netdissect_options *ndo,
 551                 const struct atNBPtuple *tp,
 552                 u_short snet, u_char snode, u_char skt)
 553 {
 554         const struct atNBPtuple *tpn;
 555
 556         tpn = nbp_name_print(ndo, tp);
 557
 558         /* if the enumerator isn't 1, print it */
 559         if (GET_U_1(tp->enumerator) != 1)
 560                 ND_PRINT("(%u)", GET_U_1(tp->enumerator));
 561
 562         /* if the socket doesn't match the src socket, print it */
 563         if (GET_U_1(tp->skt) != skt)
 564                 ND_PRINT(" %u", GET_U_1(tp->skt));
 565
 566         /* if the address doesn't match the src address, it's an anomaly */
 567         if (GET_BE_U_2(tp->net) != snet ||
 568             GET_U_1(tp->node) != snode)
 569                 ND_PRINT(" [addr=%s]",
 570                     ataddr_string(ndo, GET_BE_U_2(tp->net), GET_U_1(tp->node)));
 571
 572         return (tpn);
 573 }
 574
 575 static const struct atNBPtuple *
 576 nbp_name_print(netdissect_options *ndo,
 577                const struct atNBPtuple *tp)
 578 {
 579         const u_char *cp = (const u_char *)tp + nbpTupleSize;
 580
 581         ND_PRINT(" ");
 582
 583         /* Object */
 584         ND_PRINT("\"");
 585         if ((cp = print_cstring(ndo, cp)) != NULL) {
 586                 /* Type */
 587                 ND_PRINT(":");
 588                 if ((cp = print_cstring(ndo, cp)) != NULL) {
 589                         /* Zone */
 590                         ND_PRINT("@");
 591                         if ((cp = print_cstring(ndo, cp)) != NULL)
 592                                 ND_PRINT("\"");
 593                 }
 594         }
 595         return ((const struct atNBPtuple *)cp);
 596 }
 597
 598
 599 #define HASHNAMESIZE 4096
 600
 601 struct hnamemem {
 602         u_int addr;
 603         char *name;
 604         struct hnamemem *nxt;
 605 };
 606
 607 static struct hnamemem hnametable[HASHNAMESIZE];
 608
 609 static const char *
 610 ataddr_string(netdissect_options *ndo,
 611               u_short atnet, u_char athost)
 612 {
 613         struct hnamemem *tp, *tp2;
 614         u_int i = (atnet << 8) | athost;
 615         char nambuf[256+1];
 616         static int first = 1;
 617         FILE *fp;
 618
 619         /*
 620          * Are we doing address to name resolution?
 621          */
 622         if (!ndo->ndo_nflag) {
 623                 /*
 624                  * Yes.  Have we tried to open and read an AppleTalk
 625                  * number to name map file?
 626                  */
 627                 if (!first) {
 628                         /*
 629                          * No; try to do so.
 630                          */
 631                         first = 0;
 632                         fp = fopen("/etc/atalk.names", "r");
 633                         if (fp != NULL) {
 634                                 char line[256];
 635                                 u_int i1, i2;
 636
 637                                 while (fgets(line, sizeof(line), fp)) {
 638                                         if (line[0] == '\n' || line[0] == 0 ||
 639                                             line[0] == '#')
 640                                                 continue;
 641                                         if (sscanf(line, "%u.%u %256s", &i1,
 642                                             &i2, nambuf) == 3)
 643                                                 /* got a hostname. */
 644                                                 i2 |= (i1 << 8);
 645                                         else if (sscanf(line, "%u %256s", &i1,
 646                                             nambuf) == 2)
 647                                                 /* got a net name */
 648                                                 i2 = (i1 << 8) | 255;
 649                                         else
 650                                                 continue;
 651
 652                                         for (tp = &hnametable[i2 & (HASHNAMESIZE-1)];
 653                                              tp->nxt; tp = tp->nxt)
 654                                                 ;
 655                                         tp->addr = i2;
 656                                         tp->nxt = newhnamemem(ndo);
 657                                         tp->name = strdup(nambuf);
 658                                         if (tp->name == NULL)
 659                                                 (*ndo->ndo_error)(ndo,
 660                                                     S_ERR_ND_MEM_ALLOC,
 661                                                     "%s: strdup(nambuf)", __func__);
 662                                 }
 663                                 fclose(fp);
 664                         }
 665                 }
 666         }
 667
 668         /*
 669          * Now try to look up the address in the table.
 670          */
 671         for (tp = &hnametable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 672                 if (tp->addr == i)
 673                         return (tp->name);
 674
 675         /* didn't have the node name -- see if we've got the net name */
 676         i |= 255;
 677         for (tp2 = &hnametable[i & (HASHNAMESIZE-1)]; tp2->nxt; tp2 = tp2->nxt)
 678                 if (tp2->addr == i) {
 679                         tp->addr = (atnet << 8) | athost;
 680                         tp->nxt = newhnamemem(ndo);
 681                         (void)snprintf(nambuf, sizeof(nambuf), "%s.%u",
 682                             tp2->name, athost);
 683                         tp->name = strdup(nambuf);
 684                         if (tp->name == NULL)
 685                                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 686                                         "%s: strdup(nambuf)", __func__);
 687                         return (tp->name);
 688                 }
 689
 690         tp->addr = (atnet << 8) | athost;
 691         tp->nxt = newhnamemem(ndo);
 692         if (athost != 255)
 693                 (void)snprintf(nambuf, sizeof(nambuf), "%u.%u", atnet, athost);
 694         else
 695                 (void)snprintf(nambuf, sizeof(nambuf), "%u", atnet);
 696         tp->name = strdup(nambuf);
 697         if (tp->name == NULL)
 698                 (*ndo->ndo_error)(ndo, S_ERR_ND_MEM_ALLOC,
 699                                   "%s: strdup(nambuf)", __func__);
 700
 701         return (tp->name);
 702 }
 703
 704 #define rtmpSkt 1
 705 #define nbpSkt  2
 706 #define echoSkt 4
 707 #define zipSkt  6
 708 static const struct tok skt2str[] = {
 709         { rtmpSkt,      "rtmp" },       /* routing table maintenance */
 710         { nbpSkt,       "nis" },        /* name info socket */
 711         { echoSkt,      "echo" },       /* AppleTalk echo protocol */
 712         { zipSkt,       "zip" },        /* zone info protocol */
 713         { 0,            NULL }
 714 };
 715
 716 static const char *
 717 ddpskt_string(netdissect_options *ndo,
 718               u_int skt)
 719 {
 720         static char buf[8];
 721
 722         if (ndo->ndo_nflag) {
 723                 (void)snprintf(buf, sizeof(buf), "%u", skt);
 724                 return (buf);
 725         }
 726         return (tok2str(skt2str, "%u", skt));
 727 }