The Tcpdump Group git mirrors - tcpdump/blob - addrtoname.c

   1 /*
   2  * Copyright (c) 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  *  Internet, ethernet, port, and protocol string to address
  22  *  and address to string conversion routines
  23  */
  24
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #ifdef USE_ETHER_NTOHOST
  32 #ifdef HAVE_NETINET_IF_ETHER_H
  33 struct mbuf;            /* Squelch compiler warnings on some platforms for */
  34 struct rtentry;         /* declarations in <net/if.h> */
  35 #include <net/if.h>     /* for "struct ifnet" in "struct arpcom" on Solaris */
  36 #include <netinet/if_ether.h>
  37 #endif /* HAVE_NETINET_IF_ETHER_H */
  38 #ifdef NETINET_ETHER_H_DECLARES_ETHER_NTOHOST
  39 #include <netinet/ether.h>
  40 #endif /* NETINET_ETHER_H_DECLARES_ETHER_NTOHOST */
  41
  42 #if !defined(HAVE_DECL_ETHER_NTOHOST) || !HAVE_DECL_ETHER_NTOHOST
  43 #ifndef HAVE_STRUCT_ETHER_ADDR
  44 struct ether_addr {
  45         unsigned char ether_addr_octet[6];
  46 };
  47 #endif
  48 extern int ether_ntohost(char *, const struct ether_addr *);
  49 #endif
  50
  51 #endif /* USE_ETHER_NTOHOST */
  52
  53 #include <pcap.h>
  54 #include <pcap-namedb.h>
  55 #include <signal.h>
  56 #include <stdio.h>
  57 #include <string.h>
  58 #include <stdlib.h>
  59
  60 #include "interface.h"
  61 #include "addrtoname.h"
  62 #include "llc.h"
  63 #include "setsignal.h"
  64 #include "extract.h"
  65 #include "oui.h"
  66
  67 #ifndef ETHER_ADDR_LEN
  68 #define ETHER_ADDR_LEN  6
  69 #endif
  70
  71 /*
  72  * hash tables for whatever-to-name translations
  73  *
  74  * ndo_error() called on strdup(3) failure
  75  */
  76
  77 #define HASHNAMESIZE 4096
  78
  79 struct hnamemem {
  80         uint32_t addr;
  81         const char *name;
  82         struct hnamemem *nxt;
  83 };
  84
  85 static struct hnamemem hnametable[HASHNAMESIZE];
  86 static struct hnamemem tporttable[HASHNAMESIZE];
  87 static struct hnamemem uporttable[HASHNAMESIZE];
  88 static struct hnamemem eprototable[HASHNAMESIZE];
  89 static struct hnamemem dnaddrtable[HASHNAMESIZE];
  90 static struct hnamemem ipxsaptable[HASHNAMESIZE];
  91
  92 #if defined(INET6) && defined(_WIN32)
  93 /*
  94  * fake gethostbyaddr for Win2k/XP
  95  * gethostbyaddr() returns incorrect value when AF_INET6 is passed
  96  * to 3rd argument.
  97  *
  98  * h_name in struct hostent is only valid.
  99  */
 100 static struct hostent *
 101 win32_gethostbyaddr(const char *addr, int len, int type)
 102 {
 103         static struct hostent host;
 104         static char hostbuf[NI_MAXHOST];
 105         char hname[NI_MAXHOST];
 106         struct sockaddr_in6 addr6;
 107
 108         host.h_name = hostbuf;
 109         switch (type) {
 110         case AF_INET:
 111                 return gethostbyaddr(addr, len, type);
 112                 break;
 113         case AF_INET6:
 114                 memset(&addr6, 0, sizeof(addr6));
 115                 addr6.sin6_family = AF_INET6;
 116                 memcpy(&addr6.sin6_addr, addr, len);
 117                 if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6),
 118                     hname, sizeof(hname), NULL, 0, 0)) {
 119                         return NULL;
 120                 } else {
 121                         strcpy(host.h_name, hname);
 122                         return &host;
 123                 }
 124                 break;
 125         default:
 126                 return NULL;
 127         }
 128 }
 129 #define gethostbyaddr win32_gethostbyaddr
 130 #endif /* INET6 & _WIN32 */
 131
 132 #ifdef INET6
 133 struct h6namemem {
 134         struct in6_addr addr;
 135         char *name;
 136         struct h6namemem *nxt;
 137 };
 138
 139 static struct h6namemem h6nametable[HASHNAMESIZE];
 140 #endif /* INET6 */
 141
 142 struct enamemem {
 143         u_short e_addr0;
 144         u_short e_addr1;
 145         u_short e_addr2;
 146         const char *e_name;
 147         u_char *e_nsap;                 /* used only for nsaptable[] */
 148 #define e_bs e_nsap                     /* for bytestringtable */
 149         struct enamemem *e_nxt;
 150 };
 151
 152 static struct enamemem enametable[HASHNAMESIZE];
 153 static struct enamemem nsaptable[HASHNAMESIZE];
 154 static struct enamemem bytestringtable[HASHNAMESIZE];
 155
 156 struct protoidmem {
 157         uint32_t p_oui;
 158         u_short p_proto;
 159         const char *p_name;
 160         struct protoidmem *p_nxt;
 161 };
 162
 163 static struct protoidmem protoidtable[HASHNAMESIZE];
 164
 165 /*
 166  * A faster replacement for inet_ntoa().
 167  */
 168 const char *
 169 intoa(uint32_t addr)
 170 {
 171         register char *cp;
 172         register u_int byte;
 173         register int n;
 174         static char buf[sizeof(".xxx.xxx.xxx.xxx")];
 175
 176         NTOHL(addr);
 177         cp = buf + sizeof(buf);
 178         *--cp = '\0';
 179
 180         n = 4;
 181         do {
 182                 byte = addr & 0xff;
 183                 *--cp = byte % 10 + '0';
 184                 byte /= 10;
 185                 if (byte > 0) {
 186                         *--cp = byte % 10 + '0';
 187                         byte /= 10;
 188                         if (byte > 0)
 189                                 *--cp = byte + '0';
 190                 }
 191                 *--cp = '.';
 192                 addr >>= 8;
 193         } while (--n > 0);
 194
 195         return cp + 1;
 196 }
 197
 198 static uint32_t f_netmask;
 199 static uint32_t f_localnet;
 200
 201 /*
 202  * Return a name for the IP address pointed to by ap.  This address
 203  * is assumed to be in network byte order.
 204  *
 205  * NOTE: ap is *NOT* necessarily part of the packet data (not even if
 206  * this is being called with the "ipaddr_string()" macro), so you
 207  * *CANNOT* use the ND_TCHECK{2}/ND_TTEST{2} macros on it.  Furthermore,
 208  * even in cases where it *is* part of the packet data, the caller
 209  * would still have to check for a null return value, even if it's
 210  * just printing the return value with "%s" - not all versions of
 211  * printf print "(null)" with "%s" and a null pointer, some of them
 212  * don't check for a null pointer and crash in that case.
 213  *
 214  * The callers of this routine should, before handing this routine
 215  * a pointer to packet data, be sure that the data is present in
 216  * the packet buffer.  They should probably do those checks anyway,
 217  * as other data at that layer might not be IP addresses, and it
 218  * also needs to check whether they're present in the packet buffer.
 219  */
 220 const char *
 221 getname(netdissect_options *ndo, const u_char *ap)
 222 {
 223         register struct hostent *hp;
 224         uint32_t addr;
 225         struct hnamemem *p;
 226
 227         memcpy(&addr, ap, sizeof(addr));
 228         p = &hnametable[addr & (HASHNAMESIZE-1)];
 229         for (; p->nxt; p = p->nxt) {
 230                 if (p->addr == addr)
 231                         return (p->name);
 232         }
 233         p->addr = addr;
 234         p->nxt = newhnamemem(ndo);
 235
 236         /*
 237          * Print names unless:
 238          *      (1) -n was given.
 239          *      (2) Address is foreign and -f was given. (If -f was not
 240          *          given, f_netmask and f_localnet are 0 and the test
 241          *          evaluates to true)
 242          */
 243         if (!ndo->ndo_nflag &&
 244             (addr & f_netmask) == f_localnet) {
 245                 hp = gethostbyaddr((char *)&addr, 4, AF_INET);
 246                 if (hp) {
 247                         char *dotp;
 248
 249                         p->name = strdup(hp->h_name);
 250                         if (p->name == NULL)
 251                                 (*ndo->ndo_error)(ndo,
 252                                                   "getname: strdup(hp->h_name)");
 253                         if (ndo->ndo_Nflag) {
 254                                 /* Remove domain qualifications */
 255                                 dotp = strchr(p->name, '.');
 256                                 if (dotp)
 257                                         *dotp = '\0';
 258                         }
 259                         return (p->name);
 260                 }
 261         }
 262         p->name = strdup(intoa(addr));
 263         if (p->name == NULL)
 264                 (*ndo->ndo_error)(ndo, "getname: strdup(intoa(addr))");
 265         return (p->name);
 266 }
 267
 268 #ifdef INET6
 269 /*
 270  * Return a name for the IP6 address pointed to by ap.  This address
 271  * is assumed to be in network byte order.
 272  */
 273 const char *
 274 getname6(netdissect_options *ndo, const u_char *ap)
 275 {
 276         register struct hostent *hp;
 277         union {
 278                 struct in6_addr addr;
 279                 struct for_hash_addr {
 280                         char fill[14];
 281                         uint16_t d;
 282                 } addra;
 283         } addr;
 284         struct h6namemem *p;
 285         register const char *cp;
 286         char ntop_buf[INET6_ADDRSTRLEN];
 287
 288         memcpy(&addr, ap, sizeof(addr));
 289         p = &h6nametable[addr.addra.d & (HASHNAMESIZE-1)];
 290         for (; p->nxt; p = p->nxt) {
 291                 if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
 292                         return (p->name);
 293         }
 294         p->addr = addr.addr;
 295         p->nxt = newh6namemem(ndo);
 296
 297         /*
 298          * Do not print names if -n was given.
 299          */
 300         if (!ndo->ndo_nflag) {
 301                 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET6);
 302                 if (hp) {
 303                         char *dotp;
 304
 305                         p->name = strdup(hp->h_name);
 306                         if (p->name == NULL)
 307                                 (*ndo->ndo_error)(ndo,
 308                                                   "getname6: strdup(hp->h_name)");
 309                         if (ndo->ndo_Nflag) {
 310                                 /* Remove domain qualifications */
 311                                 dotp = strchr(p->name, '.');
 312                                 if (dotp)
 313                                         *dotp = '\0';
 314                         }
 315                         return (p->name);
 316                 }
 317         }
 318         cp = inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf));
 319         p->name = strdup(cp);
 320         if (p->name == NULL)
 321                 (*ndo->ndo_error)(ndo, "getname6: strdup(cp)");
 322         return (p->name);
 323 }
 324 #endif /* INET6 */
 325
 326 static const char hex[] = "0123456789abcdef";
 327
 328
 329 /* Find the hash node that corresponds the ether address 'ep' */
 330
 331 static inline struct enamemem *
 332 lookup_emem(netdissect_options *ndo, const u_char *ep)
 333 {
 334         register u_int i, j, k;
 335         struct enamemem *tp;
 336
 337         k = (ep[0] << 8) | ep[1];
 338         j = (ep[2] << 8) | ep[3];
 339         i = (ep[4] << 8) | ep[5];
 340
 341         tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
 342         while (tp->e_nxt)
 343                 if (tp->e_addr0 == i &&
 344                     tp->e_addr1 == j &&
 345                     tp->e_addr2 == k)
 346                         return tp;
 347                 else
 348                         tp = tp->e_nxt;
 349         tp->e_addr0 = i;
 350         tp->e_addr1 = j;
 351         tp->e_addr2 = k;
 352         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 353         if (tp->e_nxt == NULL)
 354                 (*ndo->ndo_error)(ndo, "lookup_emem: calloc");
 355
 356         return tp;
 357 }
 358
 359 /*
 360  * Find the hash node that corresponds to the bytestring 'bs'
 361  * with length 'nlen'
 362  */
 363
 364 static inline struct enamemem *
 365 lookup_bytestring(netdissect_options *ndo, register const u_char *bs,
 366                   const unsigned int nlen)
 367 {
 368         struct enamemem *tp;
 369         register u_int i, j, k;
 370
 371         if (nlen >= 6) {
 372                 k = (bs[0] << 8) | bs[1];
 373                 j = (bs[2] << 8) | bs[3];
 374                 i = (bs[4] << 8) | bs[5];
 375         } else if (nlen >= 4) {
 376                 k = (bs[0] << 8) | bs[1];
 377                 j = (bs[2] << 8) | bs[3];
 378                 i = 0;
 379         } else
 380                 i = j = k = 0;
 381
 382         tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)];
 383         while (tp->e_nxt)
 384                 if (tp->e_addr0 == i &&
 385                     tp->e_addr1 == j &&
 386                     tp->e_addr2 == k &&
 387                     memcmp((const char *)bs, (const char *)(tp->e_bs), nlen) == 0)
 388                         return tp;
 389                 else
 390                         tp = tp->e_nxt;
 391
 392         tp->e_addr0 = i;
 393         tp->e_addr1 = j;
 394         tp->e_addr2 = k;
 395
 396         tp->e_bs = (u_char *) calloc(1, nlen + 1);
 397         if (tp->e_bs == NULL)
 398                 (*ndo->ndo_error)(ndo, "lookup_bytestring: calloc");
 399
 400         memcpy(tp->e_bs, bs, nlen);
 401         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 402         if (tp->e_nxt == NULL)
 403                 (*ndo->ndo_error)(ndo, "lookup_bytestring: calloc");
 404
 405         return tp;
 406 }
 407
 408 /* Find the hash node that corresponds the NSAP 'nsap' */
 409
 410 static inline struct enamemem *
 411 lookup_nsap(netdissect_options *ndo, register const u_char *nsap)
 412 {
 413         register u_int i, j, k;
 414         unsigned int nlen = *nsap;
 415         struct enamemem *tp;
 416         const u_char *ensap = nsap + nlen - 6;
 417
 418         if (nlen > 6) {
 419                 k = (ensap[0] << 8) | ensap[1];
 420                 j = (ensap[2] << 8) | ensap[3];
 421                 i = (ensap[4] << 8) | ensap[5];
 422         }
 423         else
 424                 i = j = k = 0;
 425
 426         tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
 427         while (tp->e_nxt)
 428                 if (tp->e_addr0 == i &&
 429                     tp->e_addr1 == j &&
 430                     tp->e_addr2 == k &&
 431                     tp->e_nsap[0] == nlen &&
 432                     memcmp((const char *)&(nsap[1]),
 433                         (char *)&(tp->e_nsap[1]), nlen) == 0)
 434                         return tp;
 435                 else
 436                         tp = tp->e_nxt;
 437         tp->e_addr0 = i;
 438         tp->e_addr1 = j;
 439         tp->e_addr2 = k;
 440         tp->e_nsap = (u_char *)malloc(nlen + 1);
 441         if (tp->e_nsap == NULL)
 442                 (*ndo->ndo_error)(ndo, "lookup_nsap: malloc");
 443         memcpy((char *)tp->e_nsap, (const char *)nsap, nlen + 1);
 444         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 445         if (tp->e_nxt == NULL)
 446                 (*ndo->ndo_error)(ndo, "lookup_nsap: calloc");
 447
 448         return tp;
 449 }
 450
 451 /* Find the hash node that corresponds the protoid 'pi'. */
 452
 453 static inline struct protoidmem *
 454 lookup_protoid(netdissect_options *ndo, const u_char *pi)
 455 {
 456         register u_int i, j;
 457         struct protoidmem *tp;
 458
 459         /* 5 octets won't be aligned */
 460         i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
 461         j =   (pi[3] << 8) + pi[4];
 462         /* XXX should be endian-insensitive, but do big-endian testing  XXX */
 463
 464         tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
 465         while (tp->p_nxt)
 466                 if (tp->p_oui == i && tp->p_proto == j)
 467                         return tp;
 468                 else
 469                         tp = tp->p_nxt;
 470         tp->p_oui = i;
 471         tp->p_proto = j;
 472         tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
 473         if (tp->p_nxt == NULL)
 474                 (*ndo->ndo_error)(ndo, "lookup_protoid: calloc");
 475
 476         return tp;
 477 }
 478
 479 const char *
 480 etheraddr_string(netdissect_options *ndo, register const u_char *ep)
 481 {
 482         register int i;
 483         register char *cp;
 484         register struct enamemem *tp;
 485         int oui;
 486         char buf[BUFSIZE];
 487
 488         tp = lookup_emem(ndo, ep);
 489         if (tp->e_name)
 490                 return (tp->e_name);
 491 #ifdef USE_ETHER_NTOHOST
 492         if (!ndo->ndo_nflag) {
 493                 char buf2[BUFSIZE];
 494
 495                 if (ether_ntohost(buf2, (const struct ether_addr *)ep) == 0) {
 496                         tp->e_name = strdup(buf2);
 497                         if (tp->e_name == NULL)
 498                                 (*ndo->ndo_error)(ndo,
 499                                                   "etheraddr_string: strdup(buf2)");
 500                         return (tp->e_name);
 501                 }
 502         }
 503 #endif
 504         cp = buf;
 505         oui = EXTRACT_24BITS(ep);
 506         *cp++ = hex[*ep >> 4 ];
 507         *cp++ = hex[*ep++ & 0xf];
 508         for (i = 5; --i >= 0;) {
 509                 *cp++ = ':';
 510                 *cp++ = hex[*ep >> 4 ];
 511                 *cp++ = hex[*ep++ & 0xf];
 512         }
 513
 514         if (!ndo->ndo_nflag) {
 515                 snprintf(cp, BUFSIZE - (2 + 5*3), " (oui %s)",
 516                     tok2str(oui_values, "Unknown", oui));
 517         } else
 518                 *cp = '\0';
 519         tp->e_name = strdup(buf);
 520         if (tp->e_name == NULL)
 521                 (*ndo->ndo_error)(ndo, "etheraddr_string: strdup(buf)");
 522         return (tp->e_name);
 523 }
 524
 525 const char *
 526 le64addr_string(netdissect_options *ndo, const u_char *ep)
 527 {
 528         const unsigned int len = 8;
 529         register u_int i;
 530         register char *cp;
 531         register struct enamemem *tp;
 532         char buf[BUFSIZE];
 533
 534         tp = lookup_bytestring(ndo, ep, len);
 535         if (tp->e_name)
 536                 return (tp->e_name);
 537
 538         cp = buf;
 539         for (i = len; i > 0 ; --i) {
 540                 *cp++ = hex[*(ep + i - 1) >> 4];
 541                 *cp++ = hex[*(ep + i - 1) & 0xf];
 542                 *cp++ = ':';
 543         }
 544         cp --;
 545
 546         *cp = '\0';
 547
 548         tp->e_name = strdup(buf);
 549         if (tp->e_name == NULL)
 550                 (*ndo->ndo_error)(ndo, "le64addr_string: strdup(buf)");
 551
 552         return (tp->e_name);
 553 }
 554
 555 const char *
 556 linkaddr_string(netdissect_options *ndo, const u_char *ep,
 557                 const unsigned int type, const unsigned int len)
 558 {
 559         register u_int i;
 560         register char *cp;
 561         register struct enamemem *tp;
 562
 563         if (len == 0)
 564                 return ("<empty>");
 565
 566         if (type == LINKADDR_ETHER && len == ETHER_ADDR_LEN)
 567                 return (etheraddr_string(ndo, ep));
 568
 569         if (type == LINKADDR_FRELAY)
 570                 return (q922_string(ndo, ep, len));
 571
 572         tp = lookup_bytestring(ndo, ep, len);
 573         if (tp->e_name)
 574                 return (tp->e_name);
 575
 576         tp->e_name = cp = (char *)malloc(len*3);
 577         if (tp->e_name == NULL)
 578                 (*ndo->ndo_error)(ndo, "linkaddr_string: malloc");
 579         *cp++ = hex[*ep >> 4];
 580         *cp++ = hex[*ep++ & 0xf];
 581         for (i = len-1; i > 0 ; --i) {
 582                 *cp++ = ':';
 583                 *cp++ = hex[*ep >> 4];
 584                 *cp++ = hex[*ep++ & 0xf];
 585         }
 586         *cp = '\0';
 587         return (tp->e_name);
 588 }
 589
 590 const char *
 591 etherproto_string(netdissect_options *ndo, u_short port)
 592 {
 593         register char *cp;
 594         register struct hnamemem *tp;
 595         register uint32_t i = port;
 596         char buf[sizeof("0000")];
 597
 598         for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 599                 if (tp->addr == i)
 600                         return (tp->name);
 601
 602         tp->addr = i;
 603         tp->nxt = newhnamemem(ndo);
 604
 605         cp = buf;
 606         NTOHS(port);
 607         *cp++ = hex[port >> 12 & 0xf];
 608         *cp++ = hex[port >> 8 & 0xf];
 609         *cp++ = hex[port >> 4 & 0xf];
 610         *cp++ = hex[port & 0xf];
 611         *cp++ = '\0';
 612         tp->name = strdup(buf);
 613         if (tp->name == NULL)
 614                 (*ndo->ndo_error)(ndo, "etherproto_string: strdup(buf)");
 615         return (tp->name);
 616 }
 617
 618 const char *
 619 protoid_string(netdissect_options *ndo, register const u_char *pi)
 620 {
 621         register u_int i, j;
 622         register char *cp;
 623         register struct protoidmem *tp;
 624         char buf[sizeof("00:00:00:00:00")];
 625
 626         tp = lookup_protoid(ndo, pi);
 627         if (tp->p_name)
 628                 return tp->p_name;
 629
 630         cp = buf;
 631         if ((j = *pi >> 4) != 0)
 632                 *cp++ = hex[j];
 633         *cp++ = hex[*pi++ & 0xf];
 634         for (i = 4; (int)--i >= 0;) {
 635                 *cp++ = ':';
 636                 if ((j = *pi >> 4) != 0)
 637                         *cp++ = hex[j];
 638                 *cp++ = hex[*pi++ & 0xf];
 639         }
 640         *cp = '\0';
 641         tp->p_name = strdup(buf);
 642         if (tp->p_name == NULL)
 643                 (*ndo->ndo_error)(ndo, "protoid_string: strdup(buf)");
 644         return (tp->p_name);
 645 }
 646
 647 #define ISONSAP_MAX_LENGTH 20
 648 const char *
 649 isonsap_string(netdissect_options *ndo, const u_char *nsap,
 650                register u_int nsap_length)
 651 {
 652         register u_int nsap_idx;
 653         register char *cp;
 654         register struct enamemem *tp;
 655
 656         if (nsap_length < 1 || nsap_length > ISONSAP_MAX_LENGTH)
 657                 return ("isonsap_string: illegal length");
 658
 659         tp = lookup_nsap(ndo, nsap);
 660         if (tp->e_name)
 661                 return tp->e_name;
 662
 663         tp->e_name = cp = (char *)malloc(sizeof("xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx"));
 664         if (cp == NULL)
 665                 (*ndo->ndo_error)(ndo, "isonsap_string: malloc");
 666
 667         for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
 668                 *cp++ = hex[*nsap >> 4];
 669                 *cp++ = hex[*nsap++ & 0xf];
 670                 if (((nsap_idx & 1) == 0) &&
 671                      (nsap_idx + 1 < nsap_length)) {
 672                         *cp++ = '.';
 673                 }
 674         }
 675         *cp = '\0';
 676         return (tp->e_name);
 677 }
 678
 679 const char *
 680 tcpport_string(netdissect_options *ndo, u_short port)
 681 {
 682         register struct hnamemem *tp;
 683         register uint32_t i = port;
 684         char buf[sizeof("00000")];
 685
 686         for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 687                 if (tp->addr == i)
 688                         return (tp->name);
 689
 690         tp->addr = i;
 691         tp->nxt = newhnamemem(ndo);
 692
 693         (void)snprintf(buf, sizeof(buf), "%u", i);
 694         tp->name = strdup(buf);
 695         if (tp->name == NULL)
 696                 (*ndo->ndo_error)(ndo, "tcpport_string: strdup(buf)");
 697         return (tp->name);
 698 }
 699
 700 const char *
 701 udpport_string(netdissect_options *ndo, register u_short port)
 702 {
 703         register struct hnamemem *tp;
 704         register uint32_t i = port;
 705         char buf[sizeof("00000")];
 706
 707         for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 708                 if (tp->addr == i)
 709                         return (tp->name);
 710
 711         tp->addr = i;
 712         tp->nxt = newhnamemem(ndo);
 713
 714         (void)snprintf(buf, sizeof(buf), "%u", i);
 715         tp->name = strdup(buf);
 716         if (tp->name == NULL)
 717                 (*ndo->ndo_error)(ndo, "udpport_string: strdup(buf)");
 718         return (tp->name);
 719 }
 720
 721 const char *
 722 ipxsap_string(netdissect_options *ndo, u_short port)
 723 {
 724         register char *cp;
 725         register struct hnamemem *tp;
 726         register uint32_t i = port;
 727         char buf[sizeof("0000")];
 728
 729         for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 730                 if (tp->addr == i)
 731                         return (tp->name);
 732
 733         tp->addr = i;
 734         tp->nxt = newhnamemem(ndo);
 735
 736         cp = buf;
 737         NTOHS(port);
 738         *cp++ = hex[port >> 12 & 0xf];
 739         *cp++ = hex[port >> 8 & 0xf];
 740         *cp++ = hex[port >> 4 & 0xf];
 741         *cp++ = hex[port & 0xf];
 742         *cp++ = '\0';
 743         tp->name = strdup(buf);
 744         if (tp->name == NULL)
 745                 (*ndo->ndo_error)(ndo, "ipxsap_string: strdup(buf)");
 746         return (tp->name);
 747 }
 748
 749 static void
 750 init_servarray(netdissect_options *ndo)
 751 {
 752         struct servent *sv;
 753         register struct hnamemem *table;
 754         register int i;
 755         char buf[sizeof("0000000000")];
 756
 757         while ((sv = getservent()) != NULL) {
 758                 int port = ntohs(sv->s_port);
 759                 i = port & (HASHNAMESIZE-1);
 760                 if (strcmp(sv->s_proto, "tcp") == 0)
 761                         table = &tporttable[i];
 762                 else if (strcmp(sv->s_proto, "udp") == 0)
 763                         table = &uporttable[i];
 764                 else
 765                         continue;
 766
 767                 while (table->name)
 768                         table = table->nxt;
 769                 if (ndo->ndo_nflag) {
 770                         (void)snprintf(buf, sizeof(buf), "%d", port);
 771                         table->name = strdup(buf);
 772                 } else
 773                         table->name = strdup(sv->s_name);
 774                 if (table->name == NULL)
 775                         (*ndo->ndo_error)(ndo, "init_servarray: strdup");
 776
 777                 table->addr = port;
 778                 table->nxt = newhnamemem(ndo);
 779         }
 780         endservent();
 781 }
 782
 783 /* in libpcap.a (nametoaddr.c) */
 784 #if defined(_WIN32) && !defined(USE_STATIC_LIBPCAP)
 785 extern __declspec(dllimport)
 786 #else
 787 extern
 788 #endif
 789 const struct eproto {
 790         const char *s;
 791         u_short p;
 792 } eproto_db[];
 793
 794 static void
 795 init_eprotoarray(netdissect_options *ndo)
 796 {
 797         register int i;
 798         register struct hnamemem *table;
 799
 800         for (i = 0; eproto_db[i].s; i++) {
 801                 int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
 802                 table = &eprototable[j];
 803                 while (table->name)
 804                         table = table->nxt;
 805                 table->name = eproto_db[i].s;
 806                 table->addr = htons(eproto_db[i].p);
 807                 table->nxt = newhnamemem(ndo);
 808         }
 809 }
 810
 811 static const struct protoidlist {
 812         const u_char protoid[5];
 813         const char *name;
 814 } protoidlist[] = {
 815         {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
 816         {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
 817         {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
 818         {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
 819         {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
 820         {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 821 };
 822
 823 /*
 824  * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
 825  * types.
 826  */
 827 static void
 828 init_protoidarray(netdissect_options *ndo)
 829 {
 830         register int i;
 831         register struct protoidmem *tp;
 832         const struct protoidlist *pl;
 833         u_char protoid[5];
 834
 835         protoid[0] = 0;
 836         protoid[1] = 0;
 837         protoid[2] = 0;
 838         for (i = 0; eproto_db[i].s; i++) {
 839                 u_short etype = htons(eproto_db[i].p);
 840
 841                 memcpy((char *)&protoid[3], (char *)&etype, 2);
 842                 tp = lookup_protoid(ndo, protoid);
 843                 tp->p_name = strdup(eproto_db[i].s);
 844                 if (tp->p_name == NULL)
 845                         (*ndo->ndo_error)(ndo,
 846                                           "init_protoidarray: strdup(eproto_db[i].s)");
 847         }
 848         /* Hardwire some SNAP proto ID names */
 849         for (pl = protoidlist; pl->name != NULL; ++pl) {
 850                 tp = lookup_protoid(ndo, pl->protoid);
 851                 /* Don't override existing name */
 852                 if (tp->p_name != NULL)
 853                         continue;
 854
 855                 tp->p_name = pl->name;
 856         }
 857 }
 858
 859 static const struct etherlist {
 860         const u_char addr[6];
 861         const char *name;
 862 } etherlist[] = {
 863         {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
 864         {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 865 };
 866
 867 /*
 868  * Initialize the ethers hash table.  We take two different approaches
 869  * depending on whether or not the system provides the ethers name
 870  * service.  If it does, we just wire in a few names at startup,
 871  * and etheraddr_string() fills in the table on demand.  If it doesn't,
 872  * then we suck in the entire /etc/ethers file at startup.  The idea
 873  * is that parsing the local file will be fast, but spinning through
 874  * all the ethers entries via NIS & next_etherent might be very slow.
 875  *
 876  * XXX pcap_next_etherent doesn't belong in the pcap interface, but
 877  * since the pcap module already does name-to-address translation,
 878  * it's already does most of the work for the ethernet address-to-name
 879  * translation, so we just pcap_next_etherent as a convenience.
 880  */
 881 static void
 882 init_etherarray(netdissect_options *ndo)
 883 {
 884         register const struct etherlist *el;
 885         register struct enamemem *tp;
 886 #ifdef USE_ETHER_NTOHOST
 887         char name[256];
 888 #else
 889         register struct pcap_etherent *ep;
 890         register FILE *fp;
 891
 892         /* Suck in entire ethers file */
 893         fp = fopen(PCAP_ETHERS_FILE, "r");
 894         if (fp != NULL) {
 895                 while ((ep = pcap_next_etherent(fp)) != NULL) {
 896                         tp = lookup_emem(ndo, ep->addr);
 897                         tp->e_name = strdup(ep->name);
 898                         if (tp->e_name == NULL)
 899                                 (*ndo->ndo_error)(ndo,
 900                                                   "init_etherarray: strdup(ep->addr)");
 901                 }
 902                 (void)fclose(fp);
 903         }
 904 #endif
 905
 906         /* Hardwire some ethernet names */
 907         for (el = etherlist; el->name != NULL; ++el) {
 908                 tp = lookup_emem(ndo, el->addr);
 909                 /* Don't override existing name */
 910                 if (tp->e_name != NULL)
 911                         continue;
 912
 913 #ifdef USE_ETHER_NTOHOST
 914                 /*
 915                  * Use YP/NIS version of name if available.
 916                  */
 917                 if (ether_ntohost(name, (const struct ether_addr *)el->addr) == 0) {
 918                         tp->e_name = strdup(name);
 919                         if (tp->e_name == NULL)
 920                                 (*ndo->ndo_error)(ndo,
 921                                                   "init_etherarray: strdup(name)");
 922                         continue;
 923                 }
 924 #endif
 925                 tp->e_name = el->name;
 926         }
 927 }
 928
 929 static const struct tok ipxsap_db[] = {
 930         { 0x0000, "Unknown" },
 931         { 0x0001, "User" },
 932         { 0x0002, "User Group" },
 933         { 0x0003, "PrintQueue" },
 934         { 0x0004, "FileServer" },
 935         { 0x0005, "JobServer" },
 936         { 0x0006, "Gateway" },
 937         { 0x0007, "PrintServer" },
 938         { 0x0008, "ArchiveQueue" },
 939         { 0x0009, "ArchiveServer" },
 940         { 0x000a, "JobQueue" },
 941         { 0x000b, "Administration" },
 942         { 0x000F, "Novell TI-RPC" },
 943         { 0x0017, "Diagnostics" },
 944         { 0x0020, "NetBIOS" },
 945         { 0x0021, "NAS SNA Gateway" },
 946         { 0x0023, "NACS AsyncGateway" },
 947         { 0x0024, "RemoteBridge/RoutingService" },
 948         { 0x0026, "BridgeServer" },
 949         { 0x0027, "TCP/IP Gateway" },
 950         { 0x0028, "Point-to-point X.25 BridgeServer" },
 951         { 0x0029, "3270 Gateway" },
 952         { 0x002a, "CHI Corp" },
 953         { 0x002c, "PC Chalkboard" },
 954         { 0x002d, "TimeSynchServer" },
 955         { 0x002e, "ARCserve5.0/PalindromeBackup" },
 956         { 0x0045, "DI3270 Gateway" },
 957         { 0x0047, "AdvertisingPrintServer" },
 958         { 0x004a, "NetBlazerModems" },
 959         { 0x004b, "BtrieveVAP" },
 960         { 0x004c, "NetwareSQL" },
 961         { 0x004d, "XtreeNetwork" },
 962         { 0x0050, "BtrieveVAP4.11" },
 963         { 0x0052, "QuickLink" },
 964         { 0x0053, "PrintQueueUser" },
 965         { 0x0058, "Multipoint X.25 Router" },
 966         { 0x0060, "STLB/NLM" },
 967         { 0x0064, "ARCserve" },
 968         { 0x0066, "ARCserve3.0" },
 969         { 0x0072, "WAN CopyUtility" },
 970         { 0x007a, "TES-NetwareVMS" },
 971         { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" },
 972         { 0x0095, "DDA OBGYN" },
 973         { 0x0098, "NetwareAccessServer" },
 974         { 0x009a, "Netware for VMS II/NamedPipeServer" },
 975         { 0x009b, "NetwareAccessServer" },
 976         { 0x009e, "PortableNetwareServer/SunLinkNVT" },
 977         { 0x00a1, "PowerchuteAPC UPS" },
 978         { 0x00aa, "LAWserve" },
 979         { 0x00ac, "CompaqIDA StatusMonitor" },
 980         { 0x0100, "PIPE STAIL" },
 981         { 0x0102, "LAN ProtectBindery" },
 982         { 0x0103, "OracleDataBaseServer" },
 983         { 0x0107, "Netware386/RSPX RemoteConsole" },
 984         { 0x010f, "NovellSNA Gateway" },
 985         { 0x0111, "TestServer" },
 986         { 0x0112, "HP PrintServer" },
 987         { 0x0114, "CSA MUX" },
 988         { 0x0115, "CSA LCA" },
 989         { 0x0116, "CSA CM" },
 990         { 0x0117, "CSA SMA" },
 991         { 0x0118, "CSA DBA" },
 992         { 0x0119, "CSA NMA" },
 993         { 0x011a, "CSA SSA" },
 994         { 0x011b, "CSA STATUS" },
 995         { 0x011e, "CSA APPC" },
 996         { 0x0126, "SNA TEST SSA Profile" },
 997         { 0x012a, "CSA TRACE" },
 998         { 0x012b, "NetwareSAA" },
 999         { 0x012e, "IKARUS VirusScan" },
1000         { 0x0130, "CommunicationsExecutive" },
1001         { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" },
1002         { 0x0135, "NetwareNamingServicesProfile" },
1003         { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" },
1004         { 0x0141, "LAN SpoolServer" },
1005         { 0x0152, "IRMALAN Gateway" },
1006         { 0x0154, "NamedPipeServer" },
1007         { 0x0166, "NetWareManagement" },
1008         { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" },
1009         { 0x0173, "Compaq" },
1010         { 0x0174, "Compaq SNMP Agent" },
1011         { 0x0175, "Compaq" },
1012         { 0x0180, "XTreeServer/XTreeTools" },
1013         { 0x018A, "NASI ServicesBroadcastServer" },
1014         { 0x01b0, "GARP Gateway" },
1015         { 0x01b1, "Binfview" },
1016         { 0x01bf, "IntelLanDeskManager" },
1017         { 0x01ca, "AXTEC" },
1018         { 0x01cb, "ShivaNetModem/E" },
1019         { 0x01cc, "ShivaLanRover/E" },
1020         { 0x01cd, "ShivaLanRover/T" },
1021         { 0x01ce, "ShivaUniversal" },
1022         { 0x01d8, "CastelleFAXPressServer" },
1023         { 0x01da, "CastelleLANPressPrintServer" },
1024         { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" },
1025         { 0x01f0, "LEGATO" },
1026         { 0x01f5, "LEGATO" },
1027         { 0x0233, "NMS Agent/NetwareManagementAgent" },
1028         { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" },
1029         { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" },
1030         { 0x023a, "LANtern" },
1031         { 0x023c, "MAVERICK" },
1032         { 0x023f, "NovellSMDR" },
1033         { 0x024e, "NetwareConnect" },
1034         { 0x024f, "NASI ServerBroadcast Cisco" },
1035         { 0x026a, "NMS ServiceConsole" },
1036         { 0x026b, "TimeSynchronizationServer Netware 4.x" },
1037         { 0x0278, "DirectoryServer Netware 4.x" },
1038         { 0x027b, "NetwareManagementAgent" },
1039         { 0x0280, "Novell File and Printer Sharing Service for PC" },
1040         { 0x0304, "NovellSAA Gateway" },
1041         { 0x0308, "COM/VERMED" },
1042         { 0x030a, "GalacticommWorldgroupServer" },
1043         { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" },
1044         { 0x0320, "AttachmateGateway" },
1045         { 0x0327, "MicrosoftDiagnostiocs" },
1046         { 0x0328, "WATCOM SQL Server" },
1047         { 0x0335, "MultiTechSystems MultisynchCommServer" },
1048         { 0x0343, "Xylogics RemoteAccessServer/LANModem" },
1049         { 0x0355, "ArcadaBackupExec" },
1050         { 0x0358, "MSLCD1" },
1051         { 0x0361, "NETINELO" },
1052         { 0x037e, "Powerchute UPS Monitoring" },
1053         { 0x037f, "ViruSafeNotify" },
1054         { 0x0386, "HP Bridge" },
1055         { 0x0387, "HP Hub" },
1056         { 0x0394, "NetWare SAA Gateway" },
1057         { 0x039b, "LotusNotes" },
1058         { 0x03b7, "CertusAntiVirus" },
1059         { 0x03c4, "ARCserve4.0" },
1060         { 0x03c7, "LANspool3.5" },
1061         { 0x03d7, "LexmarkPrinterServer" },
1062         { 0x03d8, "LexmarkXLE PrinterServer" },
1063         { 0x03dd, "BanyanENS NetwareClient" },
1064         { 0x03de, "GuptaSequelBaseServer/NetWareSQL" },
1065         { 0x03e1, "UnivelUnixware" },
1066         { 0x03e4, "UnivelUnixware" },
1067         { 0x03fc, "IntelNetport" },
1068         { 0x03fd, "PrintServerQueue" },
1069         { 0x040A, "ipnServer" },
1070         { 0x040D, "LVERRMAN" },
1071         { 0x040E, "LVLIC" },
1072         { 0x0414, "NET Silicon (DPI)/Kyocera" },
1073         { 0x0429, "SiteLockVirus" },
1074         { 0x0432, "UFHELPR???" },
1075         { 0x0433, "Synoptics281xAdvancedSNMPAgent" },
1076         { 0x0444, "MicrosoftNT SNA Server" },
1077         { 0x0448, "Oracle" },
1078         { 0x044c, "ARCserve5.01" },
1079         { 0x0457, "CanonGP55" },
1080         { 0x045a, "QMS Printers" },
1081         { 0x045b, "DellSCSI Array" },
1082         { 0x0491, "NetBlazerModems" },
1083         { 0x04ac, "OnTimeScheduler" },
1084         { 0x04b0, "CD-Net" },
1085         { 0x0513, "EmulexNQA" },
1086         { 0x0520, "SiteLockChecks" },
1087         { 0x0529, "SiteLockChecks" },
1088         { 0x052d, "CitrixOS2 AppServer" },
1089         { 0x0535, "Tektronix" },
1090         { 0x0536, "Milan" },
1091         { 0x055d, "Attachmate SNA gateway" },
1092         { 0x056b, "IBM8235 ModemServer" },
1093         { 0x056c, "ShivaLanRover/E PLUS" },
1094         { 0x056d, "ShivaLanRover/T PLUS" },
1095         { 0x0580, "McAfeeNetShield" },
1096         { 0x05B8, "NLM to workstation communication (Revelation Software)" },
1097         { 0x05BA, "CompatibleSystemsRouters" },
1098         { 0x05BE, "CheyenneHierarchicalStorageManager" },
1099         { 0x0606, "JCWatermarkImaging" },
1100         { 0x060c, "AXISNetworkPrinter" },
1101         { 0x0610, "AdaptecSCSIManagement" },
1102         { 0x0621, "IBM AntiVirus" },
1103         { 0x0640, "Windows95 RemoteRegistryService" },
1104         { 0x064e, "MicrosoftIIS" },
1105         { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1106         { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1107         { 0x076C, "Xerox" },
1108         { 0x079b, "ShivaLanRover/E 115" },
1109         { 0x079c, "ShivaLanRover/T 115" },
1110         { 0x07B4, "CubixWorldDesk" },
1111         { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" },
1112         { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" },
1113         { 0x0810, "ELAN License Server Demo" },
1114         { 0x0824, "ShivaLanRoverAccessSwitch/E" },
1115         { 0x086a, "ISSC Collector" },
1116         { 0x087f, "ISSC DAS AgentAIX" },
1117         { 0x0880, "Intel Netport PRO" },
1118         { 0x0881, "Intel Netport PRO" },
1119         { 0x0b29, "SiteLock" },
1120         { 0x0c29, "SiteLockApplications" },
1121         { 0x0c2c, "LicensingServer" },
1122         { 0x2101, "PerformanceTechnologyInstantInternet" },
1123         { 0x2380, "LAI SiteLock" },
1124         { 0x238c, "MeetingMaker" },
1125         { 0x4808, "SiteLockServer/SiteLockMetering" },
1126         { 0x5555, "SiteLockUser" },
1127         { 0x6312, "Tapeware" },
1128         { 0x6f00, "RabbitGateway" },
1129         { 0x7703, "MODEM" },
1130         { 0x8002, "NetPortPrinters" },
1131         { 0x8008, "WordPerfectNetworkVersion" },
1132         { 0x85BE, "Cisco EIGRP" },
1133         { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" },
1134         { 0x9000, "McAfeeNetShield" },
1135         { 0x9604, "CSA-NT_MON" },
1136         { 0xb6a8, "OceanIsleReachoutRemoteControl" },
1137         { 0xf11f, "SiteLockMetering" },
1138         { 0xf1ff, "SiteLock" },
1139         { 0xf503, "Microsoft SQL Server" },
1140         { 0xF905, "IBM TimeAndPlace" },
1141         { 0xfbfb, "TopCallIII FaxServer" },
1142         { 0xffff, "AnyService/Wildcard" },
1143         { 0, (char *)0 }
1144 };
1145
1146 static void
1147 init_ipxsaparray(netdissect_options *ndo)
1148 {
1149         register int i;
1150         register struct hnamemem *table;
1151
1152         for (i = 0; ipxsap_db[i].s != NULL; i++) {
1153                 int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1);
1154                 table = &ipxsaptable[j];
1155                 while (table->name)
1156                         table = table->nxt;
1157                 table->name = ipxsap_db[i].s;
1158                 table->addr = htons(ipxsap_db[i].v);
1159                 table->nxt = newhnamemem(ndo);
1160         }
1161 }
1162
1163 /*
1164  * Initialize the address to name translation machinery.  We map all
1165  * non-local IP addresses to numeric addresses if ndo->ndo_fflag is true
1166  * (i.e., to prevent blocking on the nameserver).  localnet is the IP address
1167  * of the local network.  mask is its subnet mask.
1168  */
1169 void
1170 init_addrtoname(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
1171 {
1172         if (ndo->ndo_fflag) {
1173                 f_localnet = localnet;
1174                 f_netmask = mask;
1175         }
1176         if (ndo->ndo_nflag)
1177                 /*
1178                  * Simplest way to suppress names.
1179                  */
1180                 return;
1181
1182         init_etherarray(ndo);
1183         init_servarray(ndo);
1184         init_eprotoarray(ndo);
1185         init_protoidarray(ndo);
1186         init_ipxsaparray(ndo);
1187 }
1188
1189 const char *
1190 dnaddr_string(netdissect_options *ndo, u_short dnaddr)
1191 {
1192         register struct hnamemem *tp;
1193
1194         for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != 0;
1195              tp = tp->nxt)
1196                 if (tp->addr == dnaddr)
1197                         return (tp->name);
1198
1199         tp->addr = dnaddr;
1200         tp->nxt = newhnamemem(ndo);
1201         if (ndo->ndo_nflag)
1202                 tp->name = dnnum_string(ndo, dnaddr);
1203         else
1204                 tp->name = dnname_string(ndo, dnaddr);
1205
1206         return(tp->name);
1207 }
1208
1209 /* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */
1210 struct hnamemem *
1211 newhnamemem(netdissect_options *ndo)
1212 {
1213         register struct hnamemem *p;
1214         static struct hnamemem *ptr = NULL;
1215         static u_int num = 0;
1216
1217         if (num  <= 0) {
1218                 num = 64;
1219                 ptr = (struct hnamemem *)calloc(num, sizeof (*ptr));
1220                 if (ptr == NULL)
1221                         (*ndo->ndo_error)(ndo, "newhnamemem: calloc");
1222         }
1223         --num;
1224         p = ptr++;
1225         return (p);
1226 }
1227
1228 #ifdef INET6
1229 /* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */
1230 struct h6namemem *
1231 newh6namemem(netdissect_options *ndo)
1232 {
1233         register struct h6namemem *p;
1234         static struct h6namemem *ptr = NULL;
1235         static u_int num = 0;
1236
1237         if (num  <= 0) {
1238                 num = 64;
1239                 ptr = (struct h6namemem *)calloc(num, sizeof (*ptr));
1240                 if (ptr == NULL)
1241                         (*ndo->ndo_error)(ndo, "newh6namemem: calloc");
1242         }
1243         --num;
1244         p = ptr++;
1245         return (p);
1246 }
1247 #endif /* INET6 */
1248
1249 /* Represent TCI part of the 802.1Q 4-octet tag as text. */
1250 const char *
1251 ieee8021q_tci_string(const uint16_t tci)
1252 {
1253         static char buf[128];
1254         snprintf(buf, sizeof(buf), "vlan %u, p %u%s",
1255                  tci & 0xfff,
1256                  tci >> 13,
1257                  (tci & 0x1000) ? ", DEI" : "");
1258         return buf;
1259 }