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 #ifdef HAVE_CASPER
  30 #include <libcasper.h>
  31 #include <casper/cap_dns.h>
  32 #endif /* HAVE_CASPER */
  33
  34 #include "netdissect-stdinc.h"
  35
  36 #ifndef NTOHL
  37 #define NTOHL(x)        (x) = ntohl(x)
  38 #define NTOHS(x)        (x) = ntohs(x)
  39 #define HTONL(x)        (x) = htonl(x)
  40 #define HTONS(x)        (x) = htons(x)
  41 #endif
  42
  43 #ifndef _WIN32
  44   #ifdef USE_ETHER_NTOHOST
  45     #if defined(NET_ETHERNET_H_DECLARES_ETHER_NTOHOST)
  46       /*
  47        * OK, just include <net/ethernet.h>.
  48        */
  49       #include <net/ethernet.h>
  50     #elif defined(NETINET_ETHER_H_DECLARES_ETHER_NTOHOST)
  51       /*
  52        * OK, just include <netinet/ether.h>
  53        */
  54       #include <netinet/ether.h>
  55     #elif defined(SYS_ETHERNET_H_DECLARES_ETHER_NTOHOST)
  56       /*
  57        * OK, just include <sys/ethernet.h>
  58        */
  59       #include <sys/ethernet.h>
  60     #elif defined(ARPA_INET_H_DECLARES_ETHER_NTOHOST)
  61       /*
  62        * OK, just include <arpa/inet.h>
  63        */
  64       #include <arpa/inet.h>
  65     #elif defined(NETINET_IF_ETHER_H_DECLARES_ETHER_NTOHOST)
  66       /*
  67        * OK, include <netinet/if_ether.h>, after all the other stuff we
  68        * need to include or define for its benefit.
  69        */
  70       #define NEED_NETINET_IF_ETHER_H
  71     #else
  72       /*
  73        * We'll have to declare it ourselves.
  74        * If <netinet/if_ether.h> defines struct ether_addr, include
  75        * it.  Otherwise, define it ourselves.
  76        */
  77       #ifdef HAVE_STRUCT_ETHER_ADDR
  78         #define NEED_NETINET_IF_ETHER_H
  79       #else /* HAVE_STRUCT_ETHER_ADDR */
  80         struct ether_addr {
  81                 unsigned char ether_addr_octet[6];
  82         };
  83       #endif /* HAVE_STRUCT_ETHER_ADDR */
  84     #endif /* what declares ether_ntohost() */
  85
  86     #ifdef NEED_NETINET_IF_ETHER_H
  87       #include <net/if.h>       /* Needed on some platforms */
  88       #include <netinet/in.h>   /* Needed on some platforms */
  89       #include <netinet/if_ether.h>
  90     #endif /* NEED_NETINET_IF_ETHER_H */
  91
  92     #ifndef HAVE_DECL_ETHER_NTOHOST
  93       /*
  94        * No header declares it, so declare it ourselves.
  95        */
  96       extern int ether_ntohost(char *, const struct ether_addr *);
  97     #endif /* !defined(HAVE_DECL_ETHER_NTOHOST) */
  98   #endif /* USER_ETHER_NTOHOST */
  99 #endif /* _WIN32 */
 100
 101 #include <pcap.h>
 102 #include <pcap-namedb.h>
 103 #ifndef HAVE_GETSERVENT
 104 #include <getservent.h>
 105 #endif
 106 #include <signal.h>
 107 #include <stdio.h>
 108 #include <string.h>
 109 #include <stdlib.h>
 110
 111 #include "netdissect.h"
 112 #include "addrtoname.h"
 113 #include "addrtostr.h"
 114 #include "ethertype.h"
 115 #include "llc.h"
 116 #include "extract.h"
 117 #include "oui.h"
 118
 119 /*
 120  * hash tables for whatever-to-name translations
 121  *
 122  * ndo_error() called on strdup(3) failure
 123  */
 124
 125 #define HASHNAMESIZE 4096
 126
 127 struct hnamemem {
 128         uint32_t addr;
 129         const char *name;
 130         struct hnamemem *nxt;
 131 };
 132
 133 static struct hnamemem hnametable[HASHNAMESIZE];
 134 static struct hnamemem tporttable[HASHNAMESIZE];
 135 static struct hnamemem uporttable[HASHNAMESIZE];
 136 static struct hnamemem eprototable[HASHNAMESIZE];
 137 static struct hnamemem dnaddrtable[HASHNAMESIZE];
 138 static struct hnamemem ipxsaptable[HASHNAMESIZE];
 139
 140 #ifdef _WIN32
 141 /*
 142  * fake gethostbyaddr for Win2k/XP
 143  * gethostbyaddr() returns incorrect value when AF_INET6 is passed
 144  * to 3rd argument.
 145  *
 146  * h_name in struct hostent is only valid.
 147  */
 148 static struct hostent *
 149 win32_gethostbyaddr(const char *addr, int len, int type)
 150 {
 151         static struct hostent host;
 152         static char hostbuf[NI_MAXHOST];
 153         char hname[NI_MAXHOST];
 154         struct sockaddr_in6 addr6;
 155
 156         host.h_name = hostbuf;
 157         switch (type) {
 158         case AF_INET:
 159                 return gethostbyaddr(addr, len, type);
 160                 break;
 161         case AF_INET6:
 162                 memset(&addr6, 0, sizeof(addr6));
 163                 addr6.sin6_family = AF_INET6;
 164                 memcpy(&addr6.sin6_addr, addr, len);
 165                 if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6),
 166                     hname, sizeof(hname), NULL, 0, 0)) {
 167                         return NULL;
 168                 } else {
 169                         strcpy(host.h_name, hname);
 170                         return &host;
 171                 }
 172                 break;
 173         default:
 174                 return NULL;
 175         }
 176 }
 177 #define gethostbyaddr win32_gethostbyaddr
 178 #endif /* _WIN32 */
 179
 180 struct h6namemem {
 181         struct in6_addr addr;
 182         char *name;
 183         struct h6namemem *nxt;
 184 };
 185
 186 static struct h6namemem h6nametable[HASHNAMESIZE];
 187
 188 struct enamemem {
 189         u_short e_addr0;
 190         u_short e_addr1;
 191         u_short e_addr2;
 192         const char *e_name;
 193         u_char *e_nsap;                 /* used only for nsaptable[] */
 194         struct enamemem *e_nxt;
 195 };
 196
 197 static struct enamemem enametable[HASHNAMESIZE];
 198 static struct enamemem nsaptable[HASHNAMESIZE];
 199
 200 struct bsnamemem {
 201         u_short bs_addr0;
 202         u_short bs_addr1;
 203         u_short bs_addr2;
 204         const char *bs_name;
 205         u_char *bs_bytes;
 206         unsigned int bs_nbytes;
 207         struct bsnamemem *bs_nxt;
 208 };
 209
 210 static struct bsnamemem bytestringtable[HASHNAMESIZE];
 211
 212 struct protoidmem {
 213         uint32_t p_oui;
 214         u_short p_proto;
 215         const char *p_name;
 216         struct protoidmem *p_nxt;
 217 };
 218
 219 static struct protoidmem protoidtable[HASHNAMESIZE];
 220
 221 /*
 222  * A faster replacement for inet_ntoa().
 223  */
 224 const char *
 225 intoa(uint32_t addr)
 226 {
 227         char *cp;
 228         u_int byte;
 229         int n;
 230         static char buf[sizeof(".xxx.xxx.xxx.xxx")];
 231
 232         NTOHL(addr);
 233         cp = buf + sizeof(buf);
 234         *--cp = '\0';
 235
 236         n = 4;
 237         do {
 238                 byte = addr & 0xff;
 239                 *--cp = byte % 10 + '0';
 240                 byte /= 10;
 241                 if (byte > 0) {
 242                         *--cp = byte % 10 + '0';
 243                         byte /= 10;
 244                         if (byte > 0)
 245                                 *--cp = byte + '0';
 246                 }
 247                 *--cp = '.';
 248                 addr >>= 8;
 249         } while (--n > 0);
 250
 251         return cp + 1;
 252 }
 253
 254 static uint32_t f_netmask;
 255 static uint32_t f_localnet;
 256 #ifdef HAVE_CASPER
 257 extern cap_channel_t *capdns;
 258 #endif
 259
 260 /*
 261  * Return a name for the IP address pointed to by ap.  This address
 262  * is assumed to be in network byte order.
 263  *
 264  * NOTE: ap is *NOT* necessarily part of the packet data (not even if
 265  * this is being called with the "ipaddr_string()" macro), so you
 266  * *CANNOT* use the ND_TCHECK{2}/ND_TTEST{2} macros on it.  Furthermore,
 267  * even in cases where it *is* part of the packet data, the caller
 268  * would still have to check for a null return value, even if it's
 269  * just printing the return value with "%s" - not all versions of
 270  * printf print "(null)" with "%s" and a null pointer, some of them
 271  * don't check for a null pointer and crash in that case.
 272  *
 273  * The callers of this routine should, before handing this routine
 274  * a pointer to packet data, be sure that the data is present in
 275  * the packet buffer.  They should probably do those checks anyway,
 276  * as other data at that layer might not be IP addresses, and it
 277  * also needs to check whether they're present in the packet buffer.
 278  */
 279 const char *
 280 getname(netdissect_options *ndo, const u_char *ap)
 281 {
 282         struct hostent *hp;
 283         uint32_t addr;
 284         struct hnamemem *p;
 285
 286         memcpy(&addr, ap, sizeof(addr));
 287         p = &hnametable[addr & (HASHNAMESIZE-1)];
 288         for (; p->nxt; p = p->nxt) {
 289                 if (p->addr == addr)
 290                         return (p->name);
 291         }
 292         p->addr = addr;
 293         p->nxt = newhnamemem(ndo);
 294
 295         /*
 296          * Print names unless:
 297          *      (1) -n was given.
 298          *      (2) Address is foreign and -f was given. (If -f was not
 299          *          given, f_netmask and f_localnet are 0 and the test
 300          *          evaluates to true)
 301          */
 302         if (!ndo->ndo_nflag &&
 303             (addr & f_netmask) == f_localnet) {
 304 #ifdef HAVE_CASPER
 305                 if (capdns != NULL) {
 306                         hp = cap_gethostbyaddr(capdns, (char *)&addr, 4,
 307                             AF_INET);
 308                 } else
 309 #endif
 310                         hp = gethostbyaddr((char *)&addr, 4, AF_INET);
 311                 if (hp) {
 312                         char *dotp;
 313
 314                         p->name = strdup(hp->h_name);
 315                         if (p->name == NULL)
 316                                 (*ndo->ndo_error)(ndo,
 317                                                   "getname: strdup(hp->h_name)");
 318                         if (ndo->ndo_Nflag) {
 319                                 /* Remove domain qualifications */
 320                                 dotp = strchr(p->name, '.');
 321                                 if (dotp)
 322                                         *dotp = '\0';
 323                         }
 324                         return (p->name);
 325                 }
 326         }
 327         p->name = strdup(intoa(addr));
 328         if (p->name == NULL)
 329                 (*ndo->ndo_error)(ndo, "getname: strdup(intoa(addr))");
 330         return (p->name);
 331 }
 332
 333 /*
 334  * Return a name for the IP6 address pointed to by ap.  This address
 335  * is assumed to be in network byte order.
 336  */
 337 const char *
 338 getname6(netdissect_options *ndo, const u_char *ap)
 339 {
 340         struct hostent *hp;
 341         union {
 342                 struct in6_addr addr;
 343                 struct for_hash_addr {
 344                         char fill[14];
 345                         uint16_t d;
 346                 } addra;
 347         } addr;
 348         struct h6namemem *p;
 349         const char *cp;
 350         char ntop_buf[INET6_ADDRSTRLEN];
 351
 352         memcpy(&addr, ap, sizeof(addr));
 353         p = &h6nametable[addr.addra.d & (HASHNAMESIZE-1)];
 354         for (; p->nxt; p = p->nxt) {
 355                 if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
 356                         return (p->name);
 357         }
 358         p->addr = addr.addr;
 359         p->nxt = newh6namemem(ndo);
 360
 361         /*
 362          * Do not print names if -n was given.
 363          */
 364         if (!ndo->ndo_nflag) {
 365 #ifdef HAVE_CASPER
 366                 if (capdns != NULL) {
 367                         hp = cap_gethostbyaddr(capdns, (char *)&addr,
 368                             sizeof(addr), AF_INET6);
 369                 } else
 370 #endif
 371                         hp = gethostbyaddr((char *)&addr, sizeof(addr),
 372                             AF_INET6);
 373                 if (hp) {
 374                         char *dotp;
 375
 376                         p->name = strdup(hp->h_name);
 377                         if (p->name == NULL)
 378                                 (*ndo->ndo_error)(ndo,
 379                                                   "getname6: strdup(hp->h_name)");
 380                         if (ndo->ndo_Nflag) {
 381                                 /* Remove domain qualifications */
 382                                 dotp = strchr(p->name, '.');
 383                                 if (dotp)
 384                                         *dotp = '\0';
 385                         }
 386                         return (p->name);
 387                 }
 388         }
 389         cp = addrtostr6(ap, ntop_buf, sizeof(ntop_buf));
 390         p->name = strdup(cp);
 391         if (p->name == NULL)
 392                 (*ndo->ndo_error)(ndo, "getname6: strdup(cp)");
 393         return (p->name);
 394 }
 395
 396 static const char hex[16] = {
 397         '0', '1', '2', '3', '4', '5', '6', '7',
 398         '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'
 399 };
 400
 401 /* Find the hash node that corresponds the ether address 'ep' */
 402
 403 static inline struct enamemem *
 404 lookup_emem(netdissect_options *ndo, const u_char *ep)
 405 {
 406         u_int i, j, k;
 407         struct enamemem *tp;
 408
 409         k = (ep[0] << 8) | ep[1];
 410         j = (ep[2] << 8) | ep[3];
 411         i = (ep[4] << 8) | ep[5];
 412
 413         tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
 414         while (tp->e_nxt)
 415                 if (tp->e_addr0 == i &&
 416                     tp->e_addr1 == j &&
 417                     tp->e_addr2 == k)
 418                         return tp;
 419                 else
 420                         tp = tp->e_nxt;
 421         tp->e_addr0 = i;
 422         tp->e_addr1 = j;
 423         tp->e_addr2 = k;
 424         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 425         if (tp->e_nxt == NULL)
 426                 (*ndo->ndo_error)(ndo, "lookup_emem: calloc");
 427
 428         return tp;
 429 }
 430
 431 /*
 432  * Find the hash node that corresponds to the bytestring 'bs'
 433  * with length 'nlen'
 434  */
 435
 436 static inline struct bsnamemem *
 437 lookup_bytestring(netdissect_options *ndo, const u_char *bs,
 438                   const unsigned int nlen)
 439 {
 440         struct bsnamemem *tp;
 441         u_int i, j, k;
 442
 443         if (nlen >= 6) {
 444                 k = (bs[0] << 8) | bs[1];
 445                 j = (bs[2] << 8) | bs[3];
 446                 i = (bs[4] << 8) | bs[5];
 447         } else if (nlen >= 4) {
 448                 k = (bs[0] << 8) | bs[1];
 449                 j = (bs[2] << 8) | bs[3];
 450                 i = 0;
 451         } else
 452                 i = j = k = 0;
 453
 454         tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)];
 455         while (tp->bs_nxt)
 456                 if (nlen == tp->bs_nbytes &&
 457                     tp->bs_addr0 == i &&
 458                     tp->bs_addr1 == j &&
 459                     tp->bs_addr2 == k &&
 460                     memcmp((const char *)bs, (const char *)(tp->bs_bytes), nlen) == 0)
 461                         return tp;
 462                 else
 463                         tp = tp->bs_nxt;
 464
 465         tp->bs_addr0 = i;
 466         tp->bs_addr1 = j;
 467         tp->bs_addr2 = k;
 468
 469         tp->bs_bytes = (u_char *) calloc(1, nlen);
 470         if (tp->bs_bytes == NULL)
 471                 (*ndo->ndo_error)(ndo, "lookup_bytestring: calloc");
 472
 473         memcpy(tp->bs_bytes, bs, nlen);
 474         tp->bs_nbytes = nlen;
 475         tp->bs_nxt = (struct bsnamemem *)calloc(1, sizeof(*tp));
 476         if (tp->bs_nxt == NULL)
 477                 (*ndo->ndo_error)(ndo, "lookup_bytestring: calloc");
 478
 479         return tp;
 480 }
 481
 482 /* Find the hash node that corresponds the NSAP 'nsap' */
 483
 484 static inline struct enamemem *
 485 lookup_nsap(netdissect_options *ndo, const u_char *nsap,
 486             u_int nsap_length)
 487 {
 488         u_int i, j, k;
 489         struct enamemem *tp;
 490         const u_char *ensap;
 491
 492         if (nsap_length > 6) {
 493                 ensap = nsap + nsap_length - 6;
 494                 k = (ensap[0] << 8) | ensap[1];
 495                 j = (ensap[2] << 8) | ensap[3];
 496                 i = (ensap[4] << 8) | ensap[5];
 497         }
 498         else
 499                 i = j = k = 0;
 500
 501         tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
 502         while (tp->e_nxt)
 503                 if (nsap_length == tp->e_nsap[0] &&
 504                     tp->e_addr0 == i &&
 505                     tp->e_addr1 == j &&
 506                     tp->e_addr2 == k &&
 507                     memcmp((const char *)nsap,
 508                         (char *)&(tp->e_nsap[1]), nsap_length) == 0)
 509                         return tp;
 510                 else
 511                         tp = tp->e_nxt;
 512         tp->e_addr0 = i;
 513         tp->e_addr1 = j;
 514         tp->e_addr2 = k;
 515         tp->e_nsap = (u_char *)malloc(nsap_length + 1);
 516         if (tp->e_nsap == NULL)
 517                 (*ndo->ndo_error)(ndo, "lookup_nsap: malloc");
 518         tp->e_nsap[0] = (u_char)nsap_length;    /* guaranteed < ISONSAP_MAX_LENGTH */
 519         memcpy((char *)&tp->e_nsap[1], (const char *)nsap, nsap_length);
 520         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 521         if (tp->e_nxt == NULL)
 522                 (*ndo->ndo_error)(ndo, "lookup_nsap: calloc");
 523
 524         return tp;
 525 }
 526
 527 /* Find the hash node that corresponds the protoid 'pi'. */
 528
 529 static inline struct protoidmem *
 530 lookup_protoid(netdissect_options *ndo, const u_char *pi)
 531 {
 532         u_int i, j;
 533         struct protoidmem *tp;
 534
 535         /* 5 octets won't be aligned */
 536         i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
 537         j =   (pi[3] << 8) + pi[4];
 538         /* XXX should be endian-insensitive, but do big-endian testing  XXX */
 539
 540         tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
 541         while (tp->p_nxt)
 542                 if (tp->p_oui == i && tp->p_proto == j)
 543                         return tp;
 544                 else
 545                         tp = tp->p_nxt;
 546         tp->p_oui = i;
 547         tp->p_proto = j;
 548         tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
 549         if (tp->p_nxt == NULL)
 550                 (*ndo->ndo_error)(ndo, "lookup_protoid: calloc");
 551
 552         return tp;
 553 }
 554
 555 const char *
 556 etheraddr_string(netdissect_options *ndo, const u_char *ep)
 557 {
 558         int i;
 559         char *cp;
 560         struct enamemem *tp;
 561         int oui;
 562         char buf[BUFSIZE];
 563
 564         tp = lookup_emem(ndo, ep);
 565         if (tp->e_name)
 566                 return (tp->e_name);
 567 #ifdef USE_ETHER_NTOHOST
 568         if (!ndo->ndo_nflag) {
 569                 char buf2[BUFSIZE];
 570
 571                 if (ether_ntohost(buf2, (const struct ether_addr *)ep) == 0) {
 572                         tp->e_name = strdup(buf2);
 573                         if (tp->e_name == NULL)
 574                                 (*ndo->ndo_error)(ndo,
 575                                                   "etheraddr_string: strdup(buf2)");
 576                         return (tp->e_name);
 577                 }
 578         }
 579 #endif
 580         cp = buf;
 581         oui = EXTRACT_BE_U_3(ep);
 582         *cp++ = hex[*ep >> 4 ];
 583         *cp++ = hex[*ep++ & 0xf];
 584         for (i = 5; --i >= 0;) {
 585                 *cp++ = ':';
 586                 *cp++ = hex[*ep >> 4 ];
 587                 *cp++ = hex[*ep++ & 0xf];
 588         }
 589
 590         if (!ndo->ndo_nflag) {
 591                 snprintf(cp, BUFSIZE - (2 + 5*3), " (oui %s)",
 592                     tok2str(oui_values, "Unknown", oui));
 593         } else
 594                 *cp = '\0';
 595         tp->e_name = strdup(buf);
 596         if (tp->e_name == NULL)
 597                 (*ndo->ndo_error)(ndo, "etheraddr_string: strdup(buf)");
 598         return (tp->e_name);
 599 }
 600
 601 const char *
 602 le64addr_string(netdissect_options *ndo, const u_char *ep)
 603 {
 604         const unsigned int len = 8;
 605         u_int i;
 606         char *cp;
 607         struct bsnamemem *tp;
 608         char buf[BUFSIZE];
 609
 610         tp = lookup_bytestring(ndo, ep, len);
 611         if (tp->bs_name)
 612                 return (tp->bs_name);
 613
 614         cp = buf;
 615         for (i = len; i > 0 ; --i) {
 616                 *cp++ = hex[*(ep + i - 1) >> 4];
 617                 *cp++ = hex[*(ep + i - 1) & 0xf];
 618                 *cp++ = ':';
 619         }
 620         cp --;
 621
 622         *cp = '\0';
 623
 624         tp->bs_name = strdup(buf);
 625         if (tp->bs_name == NULL)
 626                 (*ndo->ndo_error)(ndo, "le64addr_string: strdup(buf)");
 627
 628         return (tp->bs_name);
 629 }
 630
 631 const char *
 632 linkaddr_string(netdissect_options *ndo, const u_char *ep,
 633                 const unsigned int type, const unsigned int len)
 634 {
 635         u_int i;
 636         char *cp;
 637         struct bsnamemem *tp;
 638
 639         if (len == 0)
 640                 return ("<empty>");
 641
 642         if (type == LINKADDR_ETHER && len == MAC_ADDR_LEN)
 643                 return (etheraddr_string(ndo, ep));
 644
 645         if (type == LINKADDR_FRELAY)
 646                 return (q922_string(ndo, ep, len));
 647
 648         tp = lookup_bytestring(ndo, ep, len);
 649         if (tp->bs_name)
 650                 return (tp->bs_name);
 651
 652         tp->bs_name = cp = (char *)malloc(len*3);
 653         if (tp->bs_name == NULL)
 654                 (*ndo->ndo_error)(ndo, "linkaddr_string: malloc");
 655         *cp++ = hex[*ep >> 4];
 656         *cp++ = hex[*ep++ & 0xf];
 657         for (i = len-1; i > 0 ; --i) {
 658                 *cp++ = ':';
 659                 *cp++ = hex[*ep >> 4];
 660                 *cp++ = hex[*ep++ & 0xf];
 661         }
 662         *cp = '\0';
 663         return (tp->bs_name);
 664 }
 665
 666 const char *
 667 etherproto_string(netdissect_options *ndo, u_short port)
 668 {
 669         char *cp;
 670         struct hnamemem *tp;
 671         uint32_t i = port;
 672         char buf[sizeof("0000")];
 673
 674         for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 675                 if (tp->addr == i)
 676                         return (tp->name);
 677
 678         tp->addr = i;
 679         tp->nxt = newhnamemem(ndo);
 680
 681         cp = buf;
 682         NTOHS(port);
 683         *cp++ = hex[port >> 12 & 0xf];
 684         *cp++ = hex[port >> 8 & 0xf];
 685         *cp++ = hex[port >> 4 & 0xf];
 686         *cp++ = hex[port & 0xf];
 687         *cp++ = '\0';
 688         tp->name = strdup(buf);
 689         if (tp->name == NULL)
 690                 (*ndo->ndo_error)(ndo, "etherproto_string: strdup(buf)");
 691         return (tp->name);
 692 }
 693
 694 #define ISONSAP_MAX_LENGTH 20
 695 const char *
 696 isonsap_string(netdissect_options *ndo, const u_char *nsap,
 697                u_int nsap_length)
 698 {
 699         u_int nsap_idx;
 700         char *cp;
 701         struct enamemem *tp;
 702
 703         if (nsap_length < 1 || nsap_length > ISONSAP_MAX_LENGTH)
 704                 return ("isonsap_string: illegal length");
 705
 706         tp = lookup_nsap(ndo, nsap, nsap_length);
 707         if (tp->e_name)
 708                 return tp->e_name;
 709
 710         tp->e_name = cp = (char *)malloc(sizeof("xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx"));
 711         if (cp == NULL)
 712                 (*ndo->ndo_error)(ndo, "isonsap_string: malloc");
 713
 714         for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
 715                 *cp++ = hex[*nsap >> 4];
 716                 *cp++ = hex[*nsap++ & 0xf];
 717                 if (((nsap_idx & 1) == 0) &&
 718                      (nsap_idx + 1 < nsap_length)) {
 719                         *cp++ = '.';
 720                 }
 721         }
 722         *cp = '\0';
 723         return (tp->e_name);
 724 }
 725
 726 const char *
 727 tcpport_string(netdissect_options *ndo, u_short port)
 728 {
 729         struct hnamemem *tp;
 730         uint32_t i = port;
 731         char buf[sizeof("00000")];
 732
 733         for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 734                 if (tp->addr == i)
 735                         return (tp->name);
 736
 737         tp->addr = i;
 738         tp->nxt = newhnamemem(ndo);
 739
 740         (void)snprintf(buf, sizeof(buf), "%u", i);
 741         tp->name = strdup(buf);
 742         if (tp->name == NULL)
 743                 (*ndo->ndo_error)(ndo, "tcpport_string: strdup(buf)");
 744         return (tp->name);
 745 }
 746
 747 const char *
 748 udpport_string(netdissect_options *ndo, u_short port)
 749 {
 750         struct hnamemem *tp;
 751         uint32_t i = port;
 752         char buf[sizeof("00000")];
 753
 754         for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 755                 if (tp->addr == i)
 756                         return (tp->name);
 757
 758         tp->addr = i;
 759         tp->nxt = newhnamemem(ndo);
 760
 761         (void)snprintf(buf, sizeof(buf), "%u", i);
 762         tp->name = strdup(buf);
 763         if (tp->name == NULL)
 764                 (*ndo->ndo_error)(ndo, "udpport_string: strdup(buf)");
 765         return (tp->name);
 766 }
 767
 768 const char *
 769 ipxsap_string(netdissect_options *ndo, u_short port)
 770 {
 771         char *cp;
 772         struct hnamemem *tp;
 773         uint32_t i = port;
 774         char buf[sizeof("0000")];
 775
 776         for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 777                 if (tp->addr == i)
 778                         return (tp->name);
 779
 780         tp->addr = i;
 781         tp->nxt = newhnamemem(ndo);
 782
 783         cp = buf;
 784         NTOHS(port);
 785         *cp++ = hex[port >> 12 & 0xf];
 786         *cp++ = hex[port >> 8 & 0xf];
 787         *cp++ = hex[port >> 4 & 0xf];
 788         *cp++ = hex[port & 0xf];
 789         *cp++ = '\0';
 790         tp->name = strdup(buf);
 791         if (tp->name == NULL)
 792                 (*ndo->ndo_error)(ndo, "ipxsap_string: strdup(buf)");
 793         return (tp->name);
 794 }
 795
 796 static void
 797 init_servarray(netdissect_options *ndo)
 798 {
 799         struct servent *sv;
 800         struct hnamemem *table;
 801         int i;
 802         char buf[sizeof("0000000000")];
 803
 804         while ((sv = getservent()) != NULL) {
 805                 int port = ntohs(sv->s_port);
 806                 i = port & (HASHNAMESIZE-1);
 807                 if (strcmp(sv->s_proto, "tcp") == 0)
 808                         table = &tporttable[i];
 809                 else if (strcmp(sv->s_proto, "udp") == 0)
 810                         table = &uporttable[i];
 811                 else
 812                         continue;
 813
 814                 while (table->name)
 815                         table = table->nxt;
 816                 if (ndo->ndo_nflag) {
 817                         (void)snprintf(buf, sizeof(buf), "%d", port);
 818                         table->name = strdup(buf);
 819                 } else
 820                         table->name = strdup(sv->s_name);
 821                 if (table->name == NULL)
 822                         (*ndo->ndo_error)(ndo, "init_servarray: strdup");
 823
 824                 table->addr = port;
 825                 table->nxt = newhnamemem(ndo);
 826         }
 827         endservent();
 828 }
 829
 830 static const struct eproto {
 831         const char *s;
 832         u_short p;
 833 } eproto_db[] = {
 834         { "pup", ETHERTYPE_PUP },
 835         { "xns", ETHERTYPE_NS },
 836         { "ip", ETHERTYPE_IP },
 837         { "ip6", ETHERTYPE_IPV6 },
 838         { "arp", ETHERTYPE_ARP },
 839         { "rarp", ETHERTYPE_REVARP },
 840         { "sprite", ETHERTYPE_SPRITE },
 841         { "mopdl", ETHERTYPE_MOPDL },
 842         { "moprc", ETHERTYPE_MOPRC },
 843         { "decnet", ETHERTYPE_DN },
 844         { "lat", ETHERTYPE_LAT },
 845         { "sca", ETHERTYPE_SCA },
 846         { "lanbridge", ETHERTYPE_LANBRIDGE },
 847         { "vexp", ETHERTYPE_VEXP },
 848         { "vprod", ETHERTYPE_VPROD },
 849         { "atalk", ETHERTYPE_ATALK },
 850         { "atalkarp", ETHERTYPE_AARP },
 851         { "loopback", ETHERTYPE_LOOPBACK },
 852         { "decdts", ETHERTYPE_DECDTS },
 853         { "decdns", ETHERTYPE_DECDNS },
 854         { (char *)0, 0 }
 855 };
 856
 857 static void
 858 init_eprotoarray(netdissect_options *ndo)
 859 {
 860         int i;
 861         struct hnamemem *table;
 862
 863         for (i = 0; eproto_db[i].s; i++) {
 864                 int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
 865                 table = &eprototable[j];
 866                 while (table->name)
 867                         table = table->nxt;
 868                 table->name = eproto_db[i].s;
 869                 table->addr = htons(eproto_db[i].p);
 870                 table->nxt = newhnamemem(ndo);
 871         }
 872 }
 873
 874 static const struct protoidlist {
 875         const u_char protoid[5];
 876         const char *name;
 877 } protoidlist[] = {
 878         {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
 879         {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
 880         {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
 881         {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
 882         {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
 883         {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 884 };
 885
 886 /*
 887  * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
 888  * types.
 889  */
 890 static void
 891 init_protoidarray(netdissect_options *ndo)
 892 {
 893         int i;
 894         struct protoidmem *tp;
 895         const struct protoidlist *pl;
 896         u_char protoid[5];
 897
 898         protoid[0] = 0;
 899         protoid[1] = 0;
 900         protoid[2] = 0;
 901         for (i = 0; eproto_db[i].s; i++) {
 902                 u_short etype = htons(eproto_db[i].p);
 903
 904                 memcpy((char *)&protoid[3], (char *)&etype, 2);
 905                 tp = lookup_protoid(ndo, protoid);
 906                 tp->p_name = strdup(eproto_db[i].s);
 907                 if (tp->p_name == NULL)
 908                         (*ndo->ndo_error)(ndo,
 909                                           "init_protoidarray: strdup(eproto_db[i].s)");
 910         }
 911         /* Hardwire some SNAP proto ID names */
 912         for (pl = protoidlist; pl->name != NULL; ++pl) {
 913                 tp = lookup_protoid(ndo, pl->protoid);
 914                 /* Don't override existing name */
 915                 if (tp->p_name != NULL)
 916                         continue;
 917
 918                 tp->p_name = pl->name;
 919         }
 920 }
 921
 922 static const struct etherlist {
 923         const u_char addr[6];
 924         const char *name;
 925 } etherlist[] = {
 926         {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
 927         {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 928 };
 929
 930 /*
 931  * Initialize the ethers hash table.  We take two different approaches
 932  * depending on whether or not the system provides the ethers name
 933  * service.  If it does, we just wire in a few names at startup,
 934  * and etheraddr_string() fills in the table on demand.  If it doesn't,
 935  * then we suck in the entire /etc/ethers file at startup.  The idea
 936  * is that parsing the local file will be fast, but spinning through
 937  * all the ethers entries via NIS & next_etherent might be very slow.
 938  *
 939  * XXX pcap_next_etherent doesn't belong in the pcap interface, but
 940  * since the pcap module already does name-to-address translation,
 941  * it's already does most of the work for the ethernet address-to-name
 942  * translation, so we just pcap_next_etherent as a convenience.
 943  */
 944 static void
 945 init_etherarray(netdissect_options *ndo)
 946 {
 947         const struct etherlist *el;
 948         struct enamemem *tp;
 949 #ifdef USE_ETHER_NTOHOST
 950         char name[256];
 951 #else
 952         struct pcap_etherent *ep;
 953         FILE *fp;
 954
 955         /* Suck in entire ethers file */
 956         fp = fopen(PCAP_ETHERS_FILE, "r");
 957         if (fp != NULL) {
 958                 while ((ep = pcap_next_etherent(fp)) != NULL) {
 959                         tp = lookup_emem(ndo, ep->addr);
 960                         tp->e_name = strdup(ep->name);
 961                         if (tp->e_name == NULL)
 962                                 (*ndo->ndo_error)(ndo,
 963                                                   "init_etherarray: strdup(ep->addr)");
 964                 }
 965                 (void)fclose(fp);
 966         }
 967 #endif
 968
 969         /* Hardwire some ethernet names */
 970         for (el = etherlist; el->name != NULL; ++el) {
 971                 tp = lookup_emem(ndo, el->addr);
 972                 /* Don't override existing name */
 973                 if (tp->e_name != NULL)
 974                         continue;
 975
 976 #ifdef USE_ETHER_NTOHOST
 977                 /*
 978                  * Use YP/NIS version of name if available.
 979                  */
 980                 if (ether_ntohost(name, (const struct ether_addr *)el->addr) == 0) {
 981                         tp->e_name = strdup(name);
 982                         if (tp->e_name == NULL)
 983                                 (*ndo->ndo_error)(ndo,
 984                                                   "init_etherarray: strdup(name)");
 985                         continue;
 986                 }
 987 #endif
 988                 tp->e_name = el->name;
 989         }
 990 }
 991
 992 static const struct tok ipxsap_db[] = {
 993         { 0x0000, "Unknown" },
 994         { 0x0001, "User" },
 995         { 0x0002, "User Group" },
 996         { 0x0003, "PrintQueue" },
 997         { 0x0004, "FileServer" },
 998         { 0x0005, "JobServer" },
 999         { 0x0006, "Gateway" },
1000         { 0x0007, "PrintServer" },
1001         { 0x0008, "ArchiveQueue" },
1002         { 0x0009, "ArchiveServer" },
1003         { 0x000a, "JobQueue" },
1004         { 0x000b, "Administration" },
1005         { 0x000F, "Novell TI-RPC" },
1006         { 0x0017, "Diagnostics" },
1007         { 0x0020, "NetBIOS" },
1008         { 0x0021, "NAS SNA Gateway" },
1009         { 0x0023, "NACS AsyncGateway" },
1010         { 0x0024, "RemoteBridge/RoutingService" },
1011         { 0x0026, "BridgeServer" },
1012         { 0x0027, "TCP/IP Gateway" },
1013         { 0x0028, "Point-to-point X.25 BridgeServer" },
1014         { 0x0029, "3270 Gateway" },
1015         { 0x002a, "CHI Corp" },
1016         { 0x002c, "PC Chalkboard" },
1017         { 0x002d, "TimeSynchServer" },
1018         { 0x002e, "ARCserve5.0/PalindromeBackup" },
1019         { 0x0045, "DI3270 Gateway" },
1020         { 0x0047, "AdvertisingPrintServer" },
1021         { 0x004a, "NetBlazerModems" },
1022         { 0x004b, "BtrieveVAP" },
1023         { 0x004c, "NetwareSQL" },
1024         { 0x004d, "XtreeNetwork" },
1025         { 0x0050, "BtrieveVAP4.11" },
1026         { 0x0052, "QuickLink" },
1027         { 0x0053, "PrintQueueUser" },
1028         { 0x0058, "Multipoint X.25 Router" },
1029         { 0x0060, "STLB/NLM" },
1030         { 0x0064, "ARCserve" },
1031         { 0x0066, "ARCserve3.0" },
1032         { 0x0072, "WAN CopyUtility" },
1033         { 0x007a, "TES-NetwareVMS" },
1034         { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" },
1035         { 0x0095, "DDA OBGYN" },
1036         { 0x0098, "NetwareAccessServer" },
1037         { 0x009a, "Netware for VMS II/NamedPipeServer" },
1038         { 0x009b, "NetwareAccessServer" },
1039         { 0x009e, "PortableNetwareServer/SunLinkNVT" },
1040         { 0x00a1, "PowerchuteAPC UPS" },
1041         { 0x00aa, "LAWserve" },
1042         { 0x00ac, "CompaqIDA StatusMonitor" },
1043         { 0x0100, "PIPE STAIL" },
1044         { 0x0102, "LAN ProtectBindery" },
1045         { 0x0103, "OracleDataBaseServer" },
1046         { 0x0107, "Netware386/RSPX RemoteConsole" },
1047         { 0x010f, "NovellSNA Gateway" },
1048         { 0x0111, "TestServer" },
1049         { 0x0112, "HP PrintServer" },
1050         { 0x0114, "CSA MUX" },
1051         { 0x0115, "CSA LCA" },
1052         { 0x0116, "CSA CM" },
1053         { 0x0117, "CSA SMA" },
1054         { 0x0118, "CSA DBA" },
1055         { 0x0119, "CSA NMA" },
1056         { 0x011a, "CSA SSA" },
1057         { 0x011b, "CSA STATUS" },
1058         { 0x011e, "CSA APPC" },
1059         { 0x0126, "SNA TEST SSA Profile" },
1060         { 0x012a, "CSA TRACE" },
1061         { 0x012b, "NetwareSAA" },
1062         { 0x012e, "IKARUS VirusScan" },
1063         { 0x0130, "CommunicationsExecutive" },
1064         { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" },
1065         { 0x0135, "NetwareNamingServicesProfile" },
1066         { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" },
1067         { 0x0141, "LAN SpoolServer" },
1068         { 0x0152, "IRMALAN Gateway" },
1069         { 0x0154, "NamedPipeServer" },
1070         { 0x0166, "NetWareManagement" },
1071         { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" },
1072         { 0x0173, "Compaq" },
1073         { 0x0174, "Compaq SNMP Agent" },
1074         { 0x0175, "Compaq" },
1075         { 0x0180, "XTreeServer/XTreeTools" },
1076         { 0x018A, "NASI ServicesBroadcastServer" },
1077         { 0x01b0, "GARP Gateway" },
1078         { 0x01b1, "Binfview" },
1079         { 0x01bf, "IntelLanDeskManager" },
1080         { 0x01ca, "AXTEC" },
1081         { 0x01cb, "ShivaNetModem/E" },
1082         { 0x01cc, "ShivaLanRover/E" },
1083         { 0x01cd, "ShivaLanRover/T" },
1084         { 0x01ce, "ShivaUniversal" },
1085         { 0x01d8, "CastelleFAXPressServer" },
1086         { 0x01da, "CastelleLANPressPrintServer" },
1087         { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" },
1088         { 0x01f0, "LEGATO" },
1089         { 0x01f5, "LEGATO" },
1090         { 0x0233, "NMS Agent/NetwareManagementAgent" },
1091         { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" },
1092         { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" },
1093         { 0x023a, "LANtern" },
1094         { 0x023c, "MAVERICK" },
1095         { 0x023f, "NovellSMDR" },
1096         { 0x024e, "NetwareConnect" },
1097         { 0x024f, "NASI ServerBroadcast Cisco" },
1098         { 0x026a, "NMS ServiceConsole" },
1099         { 0x026b, "TimeSynchronizationServer Netware 4.x" },
1100         { 0x0278, "DirectoryServer Netware 4.x" },
1101         { 0x027b, "NetwareManagementAgent" },
1102         { 0x0280, "Novell File and Printer Sharing Service for PC" },
1103         { 0x0304, "NovellSAA Gateway" },
1104         { 0x0308, "COM/VERMED" },
1105         { 0x030a, "GalacticommWorldgroupServer" },
1106         { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" },
1107         { 0x0320, "AttachmateGateway" },
1108         { 0x0327, "MicrosoftDiagnostiocs" },
1109         { 0x0328, "WATCOM SQL Server" },
1110         { 0x0335, "MultiTechSystems MultisynchCommServer" },
1111         { 0x0343, "Xylogics RemoteAccessServer/LANModem" },
1112         { 0x0355, "ArcadaBackupExec" },
1113         { 0x0358, "MSLCD1" },
1114         { 0x0361, "NETINELO" },
1115         { 0x037e, "Powerchute UPS Monitoring" },
1116         { 0x037f, "ViruSafeNotify" },
1117         { 0x0386, "HP Bridge" },
1118         { 0x0387, "HP Hub" },
1119         { 0x0394, "NetWare SAA Gateway" },
1120         { 0x039b, "LotusNotes" },
1121         { 0x03b7, "CertusAntiVirus" },
1122         { 0x03c4, "ARCserve4.0" },
1123         { 0x03c7, "LANspool3.5" },
1124         { 0x03d7, "LexmarkPrinterServer" },
1125         { 0x03d8, "LexmarkXLE PrinterServer" },
1126         { 0x03dd, "BanyanENS NetwareClient" },
1127         { 0x03de, "GuptaSequelBaseServer/NetWareSQL" },
1128         { 0x03e1, "UnivelUnixware" },
1129         { 0x03e4, "UnivelUnixware" },
1130         { 0x03fc, "IntelNetport" },
1131         { 0x03fd, "PrintServerQueue" },
1132         { 0x040A, "ipnServer" },
1133         { 0x040D, "LVERRMAN" },
1134         { 0x040E, "LVLIC" },
1135         { 0x0414, "NET Silicon (DPI)/Kyocera" },
1136         { 0x0429, "SiteLockVirus" },
1137         { 0x0432, "UFHELPR???" },
1138         { 0x0433, "Synoptics281xAdvancedSNMPAgent" },
1139         { 0x0444, "MicrosoftNT SNA Server" },
1140         { 0x0448, "Oracle" },
1141         { 0x044c, "ARCserve5.01" },
1142         { 0x0457, "CanonGP55" },
1143         { 0x045a, "QMS Printers" },
1144         { 0x045b, "DellSCSI Array" },
1145         { 0x0491, "NetBlazerModems" },
1146         { 0x04ac, "OnTimeScheduler" },
1147         { 0x04b0, "CD-Net" },
1148         { 0x0513, "EmulexNQA" },
1149         { 0x0520, "SiteLockChecks" },
1150         { 0x0529, "SiteLockChecks" },
1151         { 0x052d, "CitrixOS2 AppServer" },
1152         { 0x0535, "Tektronix" },
1153         { 0x0536, "Milan" },
1154         { 0x055d, "Attachmate SNA gateway" },
1155         { 0x056b, "IBM8235 ModemServer" },
1156         { 0x056c, "ShivaLanRover/E PLUS" },
1157         { 0x056d, "ShivaLanRover/T PLUS" },
1158         { 0x0580, "McAfeeNetShield" },
1159         { 0x05B8, "NLM to workstation communication (Revelation Software)" },
1160         { 0x05BA, "CompatibleSystemsRouters" },
1161         { 0x05BE, "CheyenneHierarchicalStorageManager" },
1162         { 0x0606, "JCWatermarkImaging" },
1163         { 0x060c, "AXISNetworkPrinter" },
1164         { 0x0610, "AdaptecSCSIManagement" },
1165         { 0x0621, "IBM AntiVirus" },
1166         { 0x0640, "Windows95 RemoteRegistryService" },
1167         { 0x064e, "MicrosoftIIS" },
1168         { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1169         { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1170         { 0x076C, "Xerox" },
1171         { 0x079b, "ShivaLanRover/E 115" },
1172         { 0x079c, "ShivaLanRover/T 115" },
1173         { 0x07B4, "CubixWorldDesk" },
1174         { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" },
1175         { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" },
1176         { 0x0810, "ELAN License Server Demo" },
1177         { 0x0824, "ShivaLanRoverAccessSwitch/E" },
1178         { 0x086a, "ISSC Collector" },
1179         { 0x087f, "ISSC DAS AgentAIX" },
1180         { 0x0880, "Intel Netport PRO" },
1181         { 0x0881, "Intel Netport PRO" },
1182         { 0x0b29, "SiteLock" },
1183         { 0x0c29, "SiteLockApplications" },
1184         { 0x0c2c, "LicensingServer" },
1185         { 0x2101, "PerformanceTechnologyInstantInternet" },
1186         { 0x2380, "LAI SiteLock" },
1187         { 0x238c, "MeetingMaker" },
1188         { 0x4808, "SiteLockServer/SiteLockMetering" },
1189         { 0x5555, "SiteLockUser" },
1190         { 0x6312, "Tapeware" },
1191         { 0x6f00, "RabbitGateway" },
1192         { 0x7703, "MODEM" },
1193         { 0x8002, "NetPortPrinters" },
1194         { 0x8008, "WordPerfectNetworkVersion" },
1195         { 0x85BE, "Cisco EIGRP" },
1196         { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" },
1197         { 0x9000, "McAfeeNetShield" },
1198         { 0x9604, "CSA-NT_MON" },
1199         { 0xb6a8, "OceanIsleReachoutRemoteControl" },
1200         { 0xf11f, "SiteLockMetering" },
1201         { 0xf1ff, "SiteLock" },
1202         { 0xf503, "Microsoft SQL Server" },
1203         { 0xF905, "IBM TimeAndPlace" },
1204         { 0xfbfb, "TopCallIII FaxServer" },
1205         { 0xffff, "AnyService/Wildcard" },
1206         { 0, (char *)0 }
1207 };
1208
1209 static void
1210 init_ipxsaparray(netdissect_options *ndo)
1211 {
1212         int i;
1213         struct hnamemem *table;
1214
1215         for (i = 0; ipxsap_db[i].s != NULL; i++) {
1216                 int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1);
1217                 table = &ipxsaptable[j];
1218                 while (table->name)
1219                         table = table->nxt;
1220                 table->name = ipxsap_db[i].s;
1221                 table->addr = htons(ipxsap_db[i].v);
1222                 table->nxt = newhnamemem(ndo);
1223         }
1224 }
1225
1226 /*
1227  * Initialize the address to name translation machinery.  We map all
1228  * non-local IP addresses to numeric addresses if ndo->ndo_fflag is true
1229  * (i.e., to prevent blocking on the nameserver).  localnet is the IP address
1230  * of the local network.  mask is its subnet mask.
1231  */
1232 void
1233 init_addrtoname(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
1234 {
1235         if (ndo->ndo_fflag) {
1236                 f_localnet = localnet;
1237                 f_netmask = mask;
1238         }
1239         if (ndo->ndo_nflag)
1240                 /*
1241                  * Simplest way to suppress names.
1242                  */
1243                 return;
1244
1245         init_etherarray(ndo);
1246         init_servarray(ndo);
1247         init_eprotoarray(ndo);
1248         init_protoidarray(ndo);
1249         init_ipxsaparray(ndo);
1250 }
1251
1252 const char *
1253 dnaddr_string(netdissect_options *ndo, u_short dnaddr)
1254 {
1255         struct hnamemem *tp;
1256
1257         for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != NULL;
1258              tp = tp->nxt)
1259                 if (tp->addr == dnaddr)
1260                         return (tp->name);
1261
1262         tp->addr = dnaddr;
1263         tp->nxt = newhnamemem(ndo);
1264         if (ndo->ndo_nflag)
1265                 tp->name = dnnum_string(ndo, dnaddr);
1266         else
1267                 tp->name = dnname_string(ndo, dnaddr);
1268
1269         return(tp->name);
1270 }
1271
1272 /* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */
1273 struct hnamemem *
1274 newhnamemem(netdissect_options *ndo)
1275 {
1276         struct hnamemem *p;
1277         static struct hnamemem *ptr = NULL;
1278         static u_int num = 0;
1279
1280         if (num  <= 0) {
1281                 num = 64;
1282                 ptr = (struct hnamemem *)calloc(num, sizeof (*ptr));
1283                 if (ptr == NULL)
1284                         (*ndo->ndo_error)(ndo, "newhnamemem: calloc");
1285         }
1286         --num;
1287         p = ptr++;
1288         return (p);
1289 }
1290
1291 /* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */
1292 struct h6namemem *
1293 newh6namemem(netdissect_options *ndo)
1294 {
1295         struct h6namemem *p;
1296         static struct h6namemem *ptr = NULL;
1297         static u_int num = 0;
1298
1299         if (num  <= 0) {
1300                 num = 64;
1301                 ptr = (struct h6namemem *)calloc(num, sizeof (*ptr));
1302                 if (ptr == NULL)
1303                         (*ndo->ndo_error)(ndo, "newh6namemem: calloc");
1304         }
1305         --num;
1306         p = ptr++;
1307         return (p);
1308 }
1309
1310 /* Represent TCI part of the 802.1Q 4-octet tag as text. */
1311 const char *
1312 ieee8021q_tci_string(const uint16_t tci)
1313 {
1314         static char buf[128];
1315         snprintf(buf, sizeof(buf), "vlan %u, p %u%s",
1316                  tci & 0xfff,
1317                  tci >> 13,
1318                  (tci & 0x1000) ? ", DEI" : "");
1319         return buf;
1320 }