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