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 #ifdef USE_ETHER_NTOHOST
  37 #ifdef HAVE_NETINET_IF_ETHER_H
  38 struct mbuf;            /* Squelch compiler warnings on some platforms for */
  39 struct rtentry;         /* declarations in <net/if.h> */
  40 #include <net/if.h>     /* for "struct ifnet" in "struct arpcom" on Solaris */
  41 #include <netinet/if_ether.h>
  42 #endif /* HAVE_NETINET_IF_ETHER_H */
  43 #ifdef NETINET_ETHER_H_DECLARES_ETHER_NTOHOST
  44 #include <netinet/ether.h>
  45 #endif /* NETINET_ETHER_H_DECLARES_ETHER_NTOHOST */
  46
  47 #if !defined(HAVE_DECL_ETHER_NTOHOST) || !HAVE_DECL_ETHER_NTOHOST
  48 #ifndef HAVE_STRUCT_ETHER_ADDR
  49 struct ether_addr {
  50         unsigned char ether_addr_octet[6];
  51 };
  52 #endif
  53 extern int ether_ntohost(char *, const struct ether_addr *);
  54 #endif
  55
  56 #endif /* USE_ETHER_NTOHOST */
  57
  58 #include <pcap.h>
  59 #include <pcap-namedb.h>
  60 #include <signal.h>
  61 #include <stdio.h>
  62 #include <string.h>
  63 #include <stdlib.h>
  64
  65 #include "netdissect.h"
  66 #include "addrtoname.h"
  67 #include "addrtostr.h"
  68 #include "ethertype.h"
  69 #include "llc.h"
  70 #include "setsignal.h"
  71 #include "extract.h"
  72 #include "oui.h"
  73
  74 #ifndef ETHER_ADDR_LEN
  75 #define ETHER_ADDR_LEN  6
  76 #endif
  77
  78 /*
  79  * hash tables for whatever-to-name translations
  80  *
  81  * ndo_error() called on strdup(3) failure
  82  */
  83
  84 #define HASHNAMESIZE 4096
  85
  86 struct hnamemem {
  87         uint32_t addr;
  88         const char *name;
  89         struct hnamemem *nxt;
  90 };
  91
  92 static struct hnamemem hnametable[HASHNAMESIZE];
  93 static struct hnamemem tporttable[HASHNAMESIZE];
  94 static struct hnamemem uporttable[HASHNAMESIZE];
  95 static struct hnamemem eprototable[HASHNAMESIZE];
  96 static struct hnamemem dnaddrtable[HASHNAMESIZE];
  97 static struct hnamemem ipxsaptable[HASHNAMESIZE];
  98
  99 #ifdef _WIN32
 100 /*
 101  * fake gethostbyaddr for Win2k/XP
 102  * gethostbyaddr() returns incorrect value when AF_INET6 is passed
 103  * to 3rd argument.
 104  *
 105  * h_name in struct hostent is only valid.
 106  */
 107 static struct hostent *
 108 win32_gethostbyaddr(const char *addr, int len, int type)
 109 {
 110         static struct hostent host;
 111         static char hostbuf[NI_MAXHOST];
 112         char hname[NI_MAXHOST];
 113         struct sockaddr_in6 addr6;
 114
 115         host.h_name = hostbuf;
 116         switch (type) {
 117         case AF_INET:
 118                 return gethostbyaddr(addr, len, type);
 119                 break;
 120         case AF_INET6:
 121                 memset(&addr6, 0, sizeof(addr6));
 122                 addr6.sin6_family = AF_INET6;
 123                 memcpy(&addr6.sin6_addr, addr, len);
 124                 if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6),
 125                     hname, sizeof(hname), NULL, 0, 0)) {
 126                         return NULL;
 127                 } else {
 128                         strcpy(host.h_name, hname);
 129                         return &host;
 130                 }
 131                 break;
 132         default:
 133                 return NULL;
 134         }
 135 }
 136 #define gethostbyaddr win32_gethostbyaddr
 137 #endif /* _WIN32 */
 138
 139 struct h6namemem {
 140         struct in6_addr addr;
 141         char *name;
 142         struct h6namemem *nxt;
 143 };
 144
 145 static struct h6namemem h6nametable[HASHNAMESIZE];
 146
 147 struct enamemem {
 148         u_short e_addr0;
 149         u_short e_addr1;
 150         u_short e_addr2;
 151         const char *e_name;
 152         u_char *e_nsap;                 /* used only for nsaptable[] */
 153         struct enamemem *e_nxt;
 154 };
 155
 156 static struct enamemem enametable[HASHNAMESIZE];
 157 static struct enamemem nsaptable[HASHNAMESIZE];
 158
 159 struct bsnamemem {
 160         u_short bs_addr0;
 161         u_short bs_addr1;
 162         u_short bs_addr2;
 163         const char *bs_name;
 164         u_char *bs_bytes;
 165         unsigned int bs_nbytes;
 166         struct bsnamemem *bs_nxt;
 167 };
 168
 169 static struct bsnamemem bytestringtable[HASHNAMESIZE];
 170
 171 struct protoidmem {
 172         uint32_t p_oui;
 173         u_short p_proto;
 174         const char *p_name;
 175         struct protoidmem *p_nxt;
 176 };
 177
 178 static struct protoidmem protoidtable[HASHNAMESIZE];
 179
 180 /*
 181  * A faster replacement for inet_ntoa().
 182  */
 183 const char *
 184 intoa(uint32_t addr)
 185 {
 186         register char *cp;
 187         register u_int byte;
 188         register int n;
 189         static char buf[sizeof(".xxx.xxx.xxx.xxx")];
 190
 191         NTOHL(addr);
 192         cp = buf + sizeof(buf);
 193         *--cp = '\0';
 194
 195         n = 4;
 196         do {
 197                 byte = addr & 0xff;
 198                 *--cp = byte % 10 + '0';
 199                 byte /= 10;
 200                 if (byte > 0) {
 201                         *--cp = byte % 10 + '0';
 202                         byte /= 10;
 203                         if (byte > 0)
 204                                 *--cp = byte + '0';
 205                 }
 206                 *--cp = '.';
 207                 addr >>= 8;
 208         } while (--n > 0);
 209
 210         return cp + 1;
 211 }
 212
 213 static uint32_t f_netmask;
 214 static uint32_t f_localnet;
 215 #ifdef HAVE_CASPER
 216 extern cap_channel_t *capdns;
 217 #endif
 218
 219 /*
 220  * Return a name for the IP address pointed to by ap.  This address
 221  * is assumed to be in network byte order.
 222  *
 223  * NOTE: ap is *NOT* necessarily part of the packet data (not even if
 224  * this is being called with the "ipaddr_string()" macro), so you
 225  * *CANNOT* use the ND_TCHECK{2}/ND_TTEST{2} macros on it.  Furthermore,
 226  * even in cases where it *is* part of the packet data, the caller
 227  * would still have to check for a null return value, even if it's
 228  * just printing the return value with "%s" - not all versions of
 229  * printf print "(null)" with "%s" and a null pointer, some of them
 230  * don't check for a null pointer and crash in that case.
 231  *
 232  * The callers of this routine should, before handing this routine
 233  * a pointer to packet data, be sure that the data is present in
 234  * the packet buffer.  They should probably do those checks anyway,
 235  * as other data at that layer might not be IP addresses, and it
 236  * also needs to check whether they're present in the packet buffer.
 237  */
 238 const char *
 239 getname(netdissect_options *ndo, const u_char *ap)
 240 {
 241         register struct hostent *hp;
 242         uint32_t addr;
 243         struct hnamemem *p;
 244
 245         memcpy(&addr, ap, sizeof(addr));
 246         p = &hnametable[addr & (HASHNAMESIZE-1)];
 247         for (; p->nxt; p = p->nxt) {
 248                 if (p->addr == addr)
 249                         return (p->name);
 250         }
 251         p->addr = addr;
 252         p->nxt = newhnamemem(ndo);
 253
 254         /*
 255          * Print names unless:
 256          *      (1) -n was given.
 257          *      (2) Address is foreign and -f was given. (If -f was not
 258          *          given, f_netmask and f_localnet are 0 and the test
 259          *          evaluates to true)
 260          */
 261         if (!ndo->ndo_nflag &&
 262             (addr & f_netmask) == f_localnet) {
 263 #ifdef HAVE_CASPER
 264                 if (capdns != NULL) {
 265                         hp = cap_gethostbyaddr(capdns, (char *)&addr, 4,
 266                             AF_INET);
 267                 } else
 268 #endif
 269                         hp = gethostbyaddr((char *)&addr, 4, AF_INET);
 270                 if (hp) {
 271                         char *dotp;
 272
 273                         p->name = strdup(hp->h_name);
 274                         if (p->name == NULL)
 275                                 (*ndo->ndo_error)(ndo,
 276                                                   "getname: strdup(hp->h_name)");
 277                         if (ndo->ndo_Nflag) {
 278                                 /* Remove domain qualifications */
 279                                 dotp = strchr(p->name, '.');
 280                                 if (dotp)
 281                                         *dotp = '\0';
 282                         }
 283                         return (p->name);
 284                 }
 285         }
 286         p->name = strdup(intoa(addr));
 287         if (p->name == NULL)
 288                 (*ndo->ndo_error)(ndo, "getname: strdup(intoa(addr))");
 289         return (p->name);
 290 }
 291
 292 /*
 293  * Return a name for the IP6 address pointed to by ap.  This address
 294  * is assumed to be in network byte order.
 295  */
 296 const char *
 297 getname6(netdissect_options *ndo, const u_char *ap)
 298 {
 299         register struct hostent *hp;
 300         union {
 301                 struct in6_addr addr;
 302                 struct for_hash_addr {
 303                         char fill[14];
 304                         uint16_t d;
 305                 } addra;
 306         } addr;
 307         struct h6namemem *p;
 308         register const char *cp;
 309         char ntop_buf[INET6_ADDRSTRLEN];
 310
 311         memcpy(&addr, ap, sizeof(addr));
 312         p = &h6nametable[addr.addra.d & (HASHNAMESIZE-1)];
 313         for (; p->nxt; p = p->nxt) {
 314                 if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
 315                         return (p->name);
 316         }
 317         p->addr = addr.addr;
 318         p->nxt = newh6namemem(ndo);
 319
 320         /*
 321          * Do not print names if -n was given.
 322          */
 323         if (!ndo->ndo_nflag) {
 324 #ifdef HAVE_CASPER
 325                 if (capdns != NULL) {
 326                         hp = cap_gethostbyaddr(capdns, (char *)&addr,
 327                             sizeof(addr), AF_INET6);
 328                 } else
 329 #endif
 330                         hp = gethostbyaddr((char *)&addr, sizeof(addr),
 331                             AF_INET6);
 332                 if (hp) {
 333                         char *dotp;
 334
 335                         p->name = strdup(hp->h_name);
 336                         if (p->name == NULL)
 337                                 (*ndo->ndo_error)(ndo,
 338                                                   "getname6: strdup(hp->h_name)");
 339                         if (ndo->ndo_Nflag) {
 340                                 /* Remove domain qualifications */
 341                                 dotp = strchr(p->name, '.');
 342                                 if (dotp)
 343                                         *dotp = '\0';
 344                         }
 345                         return (p->name);
 346                 }
 347         }
 348         cp = addrtostr6(ap, ntop_buf, sizeof(ntop_buf));
 349         p->name = strdup(cp);
 350         if (p->name == NULL)
 351                 (*ndo->ndo_error)(ndo, "getname6: strdup(cp)");
 352         return (p->name);
 353 }
 354
 355 static const char hex[] = "0123456789abcdef";
 356
 357
 358 /* Find the hash node that corresponds the ether address 'ep' */
 359
 360 static inline struct enamemem *
 361 lookup_emem(netdissect_options *ndo, const u_char *ep)
 362 {
 363         register u_int i, j, k;
 364         struct enamemem *tp;
 365
 366         k = (ep[0] << 8) | ep[1];
 367         j = (ep[2] << 8) | ep[3];
 368         i = (ep[4] << 8) | ep[5];
 369
 370         tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
 371         while (tp->e_nxt)
 372                 if (tp->e_addr0 == i &&
 373                     tp->e_addr1 == j &&
 374                     tp->e_addr2 == k)
 375                         return tp;
 376                 else
 377                         tp = tp->e_nxt;
 378         tp->e_addr0 = i;
 379         tp->e_addr1 = j;
 380         tp->e_addr2 = k;
 381         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 382         if (tp->e_nxt == NULL)
 383                 (*ndo->ndo_error)(ndo, "lookup_emem: calloc");
 384
 385         return tp;
 386 }
 387
 388 /*
 389  * Find the hash node that corresponds to the bytestring 'bs'
 390  * with length 'nlen'
 391  */
 392
 393 static inline struct bsnamemem *
 394 lookup_bytestring(netdissect_options *ndo, register const u_char *bs,
 395                   const unsigned int nlen)
 396 {
 397         struct bsnamemem *tp;
 398         register u_int i, j, k;
 399
 400         if (nlen >= 6) {
 401                 k = (bs[0] << 8) | bs[1];
 402                 j = (bs[2] << 8) | bs[3];
 403                 i = (bs[4] << 8) | bs[5];
 404         } else if (nlen >= 4) {
 405                 k = (bs[0] << 8) | bs[1];
 406                 j = (bs[2] << 8) | bs[3];
 407                 i = 0;
 408         } else
 409                 i = j = k = 0;
 410
 411         tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)];
 412         while (tp->bs_nxt)
 413                 if (nlen == tp->bs_nbytes &&
 414                     tp->bs_addr0 == i &&
 415                     tp->bs_addr1 == j &&
 416                     tp->bs_addr2 == k &&
 417                     memcmp((const char *)bs, (const char *)(tp->bs_bytes), nlen) == 0)
 418                         return tp;
 419                 else
 420                         tp = tp->bs_nxt;
 421
 422         tp->bs_addr0 = i;
 423         tp->bs_addr1 = j;
 424         tp->bs_addr2 = k;
 425
 426         tp->bs_bytes = (u_char *) calloc(1, nlen);
 427         if (tp->bs_bytes == NULL)
 428                 (*ndo->ndo_error)(ndo, "lookup_bytestring: calloc");
 429
 430         memcpy(tp->bs_bytes, bs, nlen);
 431         tp->bs_nbytes = nlen;
 432         tp->bs_nxt = (struct bsnamemem *)calloc(1, sizeof(*tp));
 433         if (tp->bs_nxt == NULL)
 434                 (*ndo->ndo_error)(ndo, "lookup_bytestring: calloc");
 435
 436         return tp;
 437 }
 438
 439 /* Find the hash node that corresponds the NSAP 'nsap' */
 440
 441 static inline struct enamemem *
 442 lookup_nsap(netdissect_options *ndo, register const u_char *nsap,
 443             register u_int nsap_length)
 444 {
 445         register u_int i, j, k;
 446         struct enamemem *tp;
 447         const u_char *ensap;
 448
 449         if (nsap_length > 6) {
 450                 ensap = nsap + nsap_length - 6;
 451                 k = (ensap[0] << 8) | ensap[1];
 452                 j = (ensap[2] << 8) | ensap[3];
 453                 i = (ensap[4] << 8) | ensap[5];
 454         }
 455         else
 456                 i = j = k = 0;
 457
 458         tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
 459         while (tp->e_nxt)
 460                 if (nsap_length == tp->e_nsap[0] &&
 461                     tp->e_addr0 == i &&
 462                     tp->e_addr1 == j &&
 463                     tp->e_addr2 == k &&
 464                     memcmp((const char *)nsap,
 465                         (char *)&(tp->e_nsap[1]), nsap_length) == 0)
 466                         return tp;
 467                 else
 468                         tp = tp->e_nxt;
 469         tp->e_addr0 = i;
 470         tp->e_addr1 = j;
 471         tp->e_addr2 = k;
 472         tp->e_nsap = (u_char *)malloc(nsap_length + 1);
 473         if (tp->e_nsap == NULL)
 474                 (*ndo->ndo_error)(ndo, "lookup_nsap: malloc");
 475         tp->e_nsap[0] = (u_char)nsap_length;    /* guaranteed < ISONSAP_MAX_LENGTH */
 476         memcpy((char *)&tp->e_nsap[1], (const char *)nsap, nsap_length);
 477         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 478         if (tp->e_nxt == NULL)
 479                 (*ndo->ndo_error)(ndo, "lookup_nsap: calloc");
 480
 481         return tp;
 482 }
 483
 484 /* Find the hash node that corresponds the protoid 'pi'. */
 485
 486 static inline struct protoidmem *
 487 lookup_protoid(netdissect_options *ndo, const u_char *pi)
 488 {
 489         register u_int i, j;
 490         struct protoidmem *tp;
 491
 492         /* 5 octets won't be aligned */
 493         i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
 494         j =   (pi[3] << 8) + pi[4];
 495         /* XXX should be endian-insensitive, but do big-endian testing  XXX */
 496
 497         tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
 498         while (tp->p_nxt)
 499                 if (tp->p_oui == i && tp->p_proto == j)
 500                         return tp;
 501                 else
 502                         tp = tp->p_nxt;
 503         tp->p_oui = i;
 504         tp->p_proto = j;
 505         tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
 506         if (tp->p_nxt == NULL)
 507                 (*ndo->ndo_error)(ndo, "lookup_protoid: calloc");
 508
 509         return tp;
 510 }
 511
 512 const char *
 513 etheraddr_string(netdissect_options *ndo, register const u_char *ep)
 514 {
 515         register int i;
 516         register char *cp;
 517         register struct enamemem *tp;
 518         int oui;
 519         char buf[BUFSIZE];
 520
 521         tp = lookup_emem(ndo, ep);
 522         if (tp->e_name)
 523                 return (tp->e_name);
 524 #ifdef USE_ETHER_NTOHOST
 525         if (!ndo->ndo_nflag) {
 526                 char buf2[BUFSIZE];
 527
 528                 if (ether_ntohost(buf2, (const struct ether_addr *)ep) == 0) {
 529                         tp->e_name = strdup(buf2);
 530                         if (tp->e_name == NULL)
 531                                 (*ndo->ndo_error)(ndo,
 532                                                   "etheraddr_string: strdup(buf2)");
 533                         return (tp->e_name);
 534                 }
 535         }
 536 #endif
 537         cp = buf;
 538         oui = EXTRACT_24BITS(ep);
 539         *cp++ = hex[*ep >> 4 ];
 540         *cp++ = hex[*ep++ & 0xf];
 541         for (i = 5; --i >= 0;) {
 542                 *cp++ = ':';
 543                 *cp++ = hex[*ep >> 4 ];
 544                 *cp++ = hex[*ep++ & 0xf];
 545         }
 546
 547         if (!ndo->ndo_nflag) {
 548                 snprintf(cp, BUFSIZE - (2 + 5*3), " (oui %s)",
 549                     tok2str(oui_values, "Unknown", oui));
 550         } else
 551                 *cp = '\0';
 552         tp->e_name = strdup(buf);
 553         if (tp->e_name == NULL)
 554                 (*ndo->ndo_error)(ndo, "etheraddr_string: strdup(buf)");
 555         return (tp->e_name);
 556 }
 557
 558 const char *
 559 le64addr_string(netdissect_options *ndo, const u_char *ep)
 560 {
 561         const unsigned int len = 8;
 562         register u_int i;
 563         register char *cp;
 564         register struct bsnamemem *tp;
 565         char buf[BUFSIZE];
 566
 567         tp = lookup_bytestring(ndo, ep, len);
 568         if (tp->bs_name)
 569                 return (tp->bs_name);
 570
 571         cp = buf;
 572         for (i = len; i > 0 ; --i) {
 573                 *cp++ = hex[*(ep + i - 1) >> 4];
 574                 *cp++ = hex[*(ep + i - 1) & 0xf];
 575                 *cp++ = ':';
 576         }
 577         cp --;
 578
 579         *cp = '\0';
 580
 581         tp->bs_name = strdup(buf);
 582         if (tp->bs_name == NULL)
 583                 (*ndo->ndo_error)(ndo, "le64addr_string: strdup(buf)");
 584
 585         return (tp->bs_name);
 586 }
 587
 588 const char *
 589 linkaddr_string(netdissect_options *ndo, const u_char *ep,
 590                 const unsigned int type, const unsigned int len)
 591 {
 592         register u_int i;
 593         register char *cp;
 594         register struct bsnamemem *tp;
 595
 596         if (len == 0)
 597                 return ("<empty>");
 598
 599         if (type == LINKADDR_ETHER && len == ETHER_ADDR_LEN)
 600                 return (etheraddr_string(ndo, ep));
 601
 602         if (type == LINKADDR_FRELAY)
 603                 return (q922_string(ndo, ep, len));
 604
 605         tp = lookup_bytestring(ndo, ep, len);
 606         if (tp->bs_name)
 607                 return (tp->bs_name);
 608
 609         tp->bs_name = cp = (char *)malloc(len*3);
 610         if (tp->bs_name == NULL)
 611                 (*ndo->ndo_error)(ndo, "linkaddr_string: malloc");
 612         *cp++ = hex[*ep >> 4];
 613         *cp++ = hex[*ep++ & 0xf];
 614         for (i = len-1; i > 0 ; --i) {
 615                 *cp++ = ':';
 616                 *cp++ = hex[*ep >> 4];
 617                 *cp++ = hex[*ep++ & 0xf];
 618         }
 619         *cp = '\0';
 620         return (tp->bs_name);
 621 }
 622
 623 const char *
 624 etherproto_string(netdissect_options *ndo, u_short port)
 625 {
 626         register char *cp;
 627         register struct hnamemem *tp;
 628         register uint32_t i = port;
 629         char buf[sizeof("0000")];
 630
 631         for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 632                 if (tp->addr == i)
 633                         return (tp->name);
 634
 635         tp->addr = i;
 636         tp->nxt = newhnamemem(ndo);
 637
 638         cp = buf;
 639         NTOHS(port);
 640         *cp++ = hex[port >> 12 & 0xf];
 641         *cp++ = hex[port >> 8 & 0xf];
 642         *cp++ = hex[port >> 4 & 0xf];
 643         *cp++ = hex[port & 0xf];
 644         *cp++ = '\0';
 645         tp->name = strdup(buf);
 646         if (tp->name == NULL)
 647                 (*ndo->ndo_error)(ndo, "etherproto_string: strdup(buf)");
 648         return (tp->name);
 649 }
 650
 651 const char *
 652 protoid_string(netdissect_options *ndo, register const u_char *pi)
 653 {
 654         register u_int i, j;
 655         register char *cp;
 656         register struct protoidmem *tp;
 657         char buf[sizeof("00:00:00:00:00")];
 658
 659         tp = lookup_protoid(ndo, pi);
 660         if (tp->p_name)
 661                 return tp->p_name;
 662
 663         cp = buf;
 664         if ((j = *pi >> 4) != 0)
 665                 *cp++ = hex[j];
 666         *cp++ = hex[*pi++ & 0xf];
 667         for (i = 4; (int)--i >= 0;) {
 668                 *cp++ = ':';
 669                 if ((j = *pi >> 4) != 0)
 670                         *cp++ = hex[j];
 671                 *cp++ = hex[*pi++ & 0xf];
 672         }
 673         *cp = '\0';
 674         tp->p_name = strdup(buf);
 675         if (tp->p_name == NULL)
 676                 (*ndo->ndo_error)(ndo, "protoid_string: strdup(buf)");
 677         return (tp->p_name);
 678 }
 679
 680 #define ISONSAP_MAX_LENGTH 20
 681 const char *
 682 isonsap_string(netdissect_options *ndo, const u_char *nsap,
 683                register u_int nsap_length)
 684 {
 685         register u_int nsap_idx;
 686         register char *cp;
 687         register struct enamemem *tp;
 688
 689         if (nsap_length < 1 || nsap_length > ISONSAP_MAX_LENGTH)
 690                 return ("isonsap_string: illegal length");
 691
 692         tp = lookup_nsap(ndo, nsap, nsap_length);
 693         if (tp->e_name)
 694                 return tp->e_name;
 695
 696         tp->e_name = cp = (char *)malloc(sizeof("xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx"));
 697         if (cp == NULL)
 698                 (*ndo->ndo_error)(ndo, "isonsap_string: malloc");
 699
 700         for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
 701                 *cp++ = hex[*nsap >> 4];
 702                 *cp++ = hex[*nsap++ & 0xf];
 703                 if (((nsap_idx & 1) == 0) &&
 704                      (nsap_idx + 1 < nsap_length)) {
 705                         *cp++ = '.';
 706                 }
 707         }
 708         *cp = '\0';
 709         return (tp->e_name);
 710 }
 711
 712 const char *
 713 tcpport_string(netdissect_options *ndo, u_short port)
 714 {
 715         register struct hnamemem *tp;
 716         register uint32_t i = port;
 717         char buf[sizeof("00000")];
 718
 719         for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 720                 if (tp->addr == i)
 721                         return (tp->name);
 722
 723         tp->addr = i;
 724         tp->nxt = newhnamemem(ndo);
 725
 726         (void)snprintf(buf, sizeof(buf), "%u", i);
 727         tp->name = strdup(buf);
 728         if (tp->name == NULL)
 729                 (*ndo->ndo_error)(ndo, "tcpport_string: strdup(buf)");
 730         return (tp->name);
 731 }
 732
 733 const char *
 734 udpport_string(netdissect_options *ndo, register u_short port)
 735 {
 736         register struct hnamemem *tp;
 737         register uint32_t i = port;
 738         char buf[sizeof("00000")];
 739
 740         for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 741                 if (tp->addr == i)
 742                         return (tp->name);
 743
 744         tp->addr = i;
 745         tp->nxt = newhnamemem(ndo);
 746
 747         (void)snprintf(buf, sizeof(buf), "%u", i);
 748         tp->name = strdup(buf);
 749         if (tp->name == NULL)
 750                 (*ndo->ndo_error)(ndo, "udpport_string: strdup(buf)");
 751         return (tp->name);
 752 }
 753
 754 const char *
 755 ipxsap_string(netdissect_options *ndo, u_short port)
 756 {
 757         register char *cp;
 758         register struct hnamemem *tp;
 759         register uint32_t i = port;
 760         char buf[sizeof("0000")];
 761
 762         for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 763                 if (tp->addr == i)
 764                         return (tp->name);
 765
 766         tp->addr = i;
 767         tp->nxt = newhnamemem(ndo);
 768
 769         cp = buf;
 770         NTOHS(port);
 771         *cp++ = hex[port >> 12 & 0xf];
 772         *cp++ = hex[port >> 8 & 0xf];
 773         *cp++ = hex[port >> 4 & 0xf];
 774         *cp++ = hex[port & 0xf];
 775         *cp++ = '\0';
 776         tp->name = strdup(buf);
 777         if (tp->name == NULL)
 778                 (*ndo->ndo_error)(ndo, "ipxsap_string: strdup(buf)");
 779         return (tp->name);
 780 }
 781
 782 static void
 783 init_servarray(netdissect_options *ndo)
 784 {
 785         struct servent *sv;
 786         register struct hnamemem *table;
 787         register int i;
 788         char buf[sizeof("0000000000")];
 789
 790         while ((sv = getservent()) != NULL) {
 791                 int port = ntohs(sv->s_port);
 792                 i = port & (HASHNAMESIZE-1);
 793                 if (strcmp(sv->s_proto, "tcp") == 0)
 794                         table = &tporttable[i];
 795                 else if (strcmp(sv->s_proto, "udp") == 0)
 796                         table = &uporttable[i];
 797                 else
 798                         continue;
 799
 800                 while (table->name)
 801                         table = table->nxt;
 802                 if (ndo->ndo_nflag) {
 803                         (void)snprintf(buf, sizeof(buf), "%d", port);
 804                         table->name = strdup(buf);
 805                 } else
 806                         table->name = strdup(sv->s_name);
 807                 if (table->name == NULL)
 808                         (*ndo->ndo_error)(ndo, "init_servarray: strdup");
 809
 810                 table->addr = port;
 811                 table->nxt = newhnamemem(ndo);
 812         }
 813         endservent();
 814 }
 815
 816 static const struct eproto {
 817         const char *s;
 818         u_short p;
 819 } eproto_db[] = {
 820         { "pup", ETHERTYPE_PUP },
 821         { "xns", ETHERTYPE_NS },
 822         { "ip", ETHERTYPE_IP },
 823         { "ip6", ETHERTYPE_IPV6 },
 824         { "arp", ETHERTYPE_ARP },
 825         { "rarp", ETHERTYPE_REVARP },
 826         { "sprite", ETHERTYPE_SPRITE },
 827         { "mopdl", ETHERTYPE_MOPDL },
 828         { "moprc", ETHERTYPE_MOPRC },
 829         { "decnet", ETHERTYPE_DN },
 830         { "lat", ETHERTYPE_LAT },
 831         { "sca", ETHERTYPE_SCA },
 832         { "lanbridge", ETHERTYPE_LANBRIDGE },
 833         { "vexp", ETHERTYPE_VEXP },
 834         { "vprod", ETHERTYPE_VPROD },
 835         { "atalk", ETHERTYPE_ATALK },
 836         { "atalkarp", ETHERTYPE_AARP },
 837         { "loopback", ETHERTYPE_LOOPBACK },
 838         { "decdts", ETHERTYPE_DECDTS },
 839         { "decdns", ETHERTYPE_DECDNS },
 840         { (char *)0, 0 }
 841 };
 842
 843 static void
 844 init_eprotoarray(netdissect_options *ndo)
 845 {
 846         register int i;
 847         register struct hnamemem *table;
 848
 849         for (i = 0; eproto_db[i].s; i++) {
 850                 int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
 851                 table = &eprototable[j];
 852                 while (table->name)
 853                         table = table->nxt;
 854                 table->name = eproto_db[i].s;
 855                 table->addr = htons(eproto_db[i].p);
 856                 table->nxt = newhnamemem(ndo);
 857         }
 858 }
 859
 860 static const struct protoidlist {
 861         const u_char protoid[5];
 862         const char *name;
 863 } protoidlist[] = {
 864         {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
 865         {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
 866         {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
 867         {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
 868         {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
 869         {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 870 };
 871
 872 /*
 873  * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
 874  * types.
 875  */
 876 static void
 877 init_protoidarray(netdissect_options *ndo)
 878 {
 879         register int i;
 880         register struct protoidmem *tp;
 881         const struct protoidlist *pl;
 882         u_char protoid[5];
 883
 884         protoid[0] = 0;
 885         protoid[1] = 0;
 886         protoid[2] = 0;
 887         for (i = 0; eproto_db[i].s; i++) {
 888                 u_short etype = htons(eproto_db[i].p);
 889
 890                 memcpy((char *)&protoid[3], (char *)&etype, 2);
 891                 tp = lookup_protoid(ndo, protoid);
 892                 tp->p_name = strdup(eproto_db[i].s);
 893                 if (tp->p_name == NULL)
 894                         (*ndo->ndo_error)(ndo,
 895                                           "init_protoidarray: strdup(eproto_db[i].s)");
 896         }
 897         /* Hardwire some SNAP proto ID names */
 898         for (pl = protoidlist; pl->name != NULL; ++pl) {
 899                 tp = lookup_protoid(ndo, pl->protoid);
 900                 /* Don't override existing name */
 901                 if (tp->p_name != NULL)
 902                         continue;
 903
 904                 tp->p_name = pl->name;
 905         }
 906 }
 907
 908 static const struct etherlist {
 909         const u_char addr[6];
 910         const char *name;
 911 } etherlist[] = {
 912         {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
 913         {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 914 };
 915
 916 /*
 917  * Initialize the ethers hash table.  We take two different approaches
 918  * depending on whether or not the system provides the ethers name
 919  * service.  If it does, we just wire in a few names at startup,
 920  * and etheraddr_string() fills in the table on demand.  If it doesn't,
 921  * then we suck in the entire /etc/ethers file at startup.  The idea
 922  * is that parsing the local file will be fast, but spinning through
 923  * all the ethers entries via NIS & next_etherent might be very slow.
 924  *
 925  * XXX pcap_next_etherent doesn't belong in the pcap interface, but
 926  * since the pcap module already does name-to-address translation,
 927  * it's already does most of the work for the ethernet address-to-name
 928  * translation, so we just pcap_next_etherent as a convenience.
 929  */
 930 static void
 931 init_etherarray(netdissect_options *ndo)
 932 {
 933         register const struct etherlist *el;
 934         register struct enamemem *tp;
 935 #ifdef USE_ETHER_NTOHOST
 936         char name[256];
 937 #else
 938         register struct pcap_etherent *ep;
 939         register FILE *fp;
 940
 941         /* Suck in entire ethers file */
 942         fp = fopen(PCAP_ETHERS_FILE, "r");
 943         if (fp != NULL) {
 944                 while ((ep = pcap_next_etherent(fp)) != NULL) {
 945                         tp = lookup_emem(ndo, ep->addr);
 946                         tp->e_name = strdup(ep->name);
 947                         if (tp->e_name == NULL)
 948                                 (*ndo->ndo_error)(ndo,
 949                                                   "init_etherarray: strdup(ep->addr)");
 950                 }
 951                 (void)fclose(fp);
 952         }
 953 #endif
 954
 955         /* Hardwire some ethernet names */
 956         for (el = etherlist; el->name != NULL; ++el) {
 957                 tp = lookup_emem(ndo, el->addr);
 958                 /* Don't override existing name */
 959                 if (tp->e_name != NULL)
 960                         continue;
 961
 962 #ifdef USE_ETHER_NTOHOST
 963                 /*
 964                  * Use YP/NIS version of name if available.
 965                  */
 966                 if (ether_ntohost(name, (const struct ether_addr *)el->addr) == 0) {
 967                         tp->e_name = strdup(name);
 968                         if (tp->e_name == NULL)
 969                                 (*ndo->ndo_error)(ndo,
 970                                                   "init_etherarray: strdup(name)");
 971                         continue;
 972                 }
 973 #endif
 974                 tp->e_name = el->name;
 975         }
 976 }
 977
 978 static const struct tok ipxsap_db[] = {
 979         { 0x0000, "Unknown" },
 980         { 0x0001, "User" },
 981         { 0x0002, "User Group" },
 982         { 0x0003, "PrintQueue" },
 983         { 0x0004, "FileServer" },
 984         { 0x0005, "JobServer" },
 985         { 0x0006, "Gateway" },
 986         { 0x0007, "PrintServer" },
 987         { 0x0008, "ArchiveQueue" },
 988         { 0x0009, "ArchiveServer" },
 989         { 0x000a, "JobQueue" },
 990         { 0x000b, "Administration" },
 991         { 0x000F, "Novell TI-RPC" },
 992         { 0x0017, "Diagnostics" },
 993         { 0x0020, "NetBIOS" },
 994         { 0x0021, "NAS SNA Gateway" },
 995         { 0x0023, "NACS AsyncGateway" },
 996         { 0x0024, "RemoteBridge/RoutingService" },
 997         { 0x0026, "BridgeServer" },
 998         { 0x0027, "TCP/IP Gateway" },
 999         { 0x0028, "Point-to-point X.25 BridgeServer" },
1000         { 0x0029, "3270 Gateway" },
1001         { 0x002a, "CHI Corp" },
1002         { 0x002c, "PC Chalkboard" },
1003         { 0x002d, "TimeSynchServer" },
1004         { 0x002e, "ARCserve5.0/PalindromeBackup" },
1005         { 0x0045, "DI3270 Gateway" },
1006         { 0x0047, "AdvertisingPrintServer" },
1007         { 0x004a, "NetBlazerModems" },
1008         { 0x004b, "BtrieveVAP" },
1009         { 0x004c, "NetwareSQL" },
1010         { 0x004d, "XtreeNetwork" },
1011         { 0x0050, "BtrieveVAP4.11" },
1012         { 0x0052, "QuickLink" },
1013         { 0x0053, "PrintQueueUser" },
1014         { 0x0058, "Multipoint X.25 Router" },
1015         { 0x0060, "STLB/NLM" },
1016         { 0x0064, "ARCserve" },
1017         { 0x0066, "ARCserve3.0" },
1018         { 0x0072, "WAN CopyUtility" },
1019         { 0x007a, "TES-NetwareVMS" },
1020         { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" },
1021         { 0x0095, "DDA OBGYN" },
1022         { 0x0098, "NetwareAccessServer" },
1023         { 0x009a, "Netware for VMS II/NamedPipeServer" },
1024         { 0x009b, "NetwareAccessServer" },
1025         { 0x009e, "PortableNetwareServer/SunLinkNVT" },
1026         { 0x00a1, "PowerchuteAPC UPS" },
1027         { 0x00aa, "LAWserve" },
1028         { 0x00ac, "CompaqIDA StatusMonitor" },
1029         { 0x0100, "PIPE STAIL" },
1030         { 0x0102, "LAN ProtectBindery" },
1031         { 0x0103, "OracleDataBaseServer" },
1032         { 0x0107, "Netware386/RSPX RemoteConsole" },
1033         { 0x010f, "NovellSNA Gateway" },
1034         { 0x0111, "TestServer" },
1035         { 0x0112, "HP PrintServer" },
1036         { 0x0114, "CSA MUX" },
1037         { 0x0115, "CSA LCA" },
1038         { 0x0116, "CSA CM" },
1039         { 0x0117, "CSA SMA" },
1040         { 0x0118, "CSA DBA" },
1041         { 0x0119, "CSA NMA" },
1042         { 0x011a, "CSA SSA" },
1043         { 0x011b, "CSA STATUS" },
1044         { 0x011e, "CSA APPC" },
1045         { 0x0126, "SNA TEST SSA Profile" },
1046         { 0x012a, "CSA TRACE" },
1047         { 0x012b, "NetwareSAA" },
1048         { 0x012e, "IKARUS VirusScan" },
1049         { 0x0130, "CommunicationsExecutive" },
1050         { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" },
1051         { 0x0135, "NetwareNamingServicesProfile" },
1052         { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" },
1053         { 0x0141, "LAN SpoolServer" },
1054         { 0x0152, "IRMALAN Gateway" },
1055         { 0x0154, "NamedPipeServer" },
1056         { 0x0166, "NetWareManagement" },
1057         { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" },
1058         { 0x0173, "Compaq" },
1059         { 0x0174, "Compaq SNMP Agent" },
1060         { 0x0175, "Compaq" },
1061         { 0x0180, "XTreeServer/XTreeTools" },
1062         { 0x018A, "NASI ServicesBroadcastServer" },
1063         { 0x01b0, "GARP Gateway" },
1064         { 0x01b1, "Binfview" },
1065         { 0x01bf, "IntelLanDeskManager" },
1066         { 0x01ca, "AXTEC" },
1067         { 0x01cb, "ShivaNetModem/E" },
1068         { 0x01cc, "ShivaLanRover/E" },
1069         { 0x01cd, "ShivaLanRover/T" },
1070         { 0x01ce, "ShivaUniversal" },
1071         { 0x01d8, "CastelleFAXPressServer" },
1072         { 0x01da, "CastelleLANPressPrintServer" },
1073         { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" },
1074         { 0x01f0, "LEGATO" },
1075         { 0x01f5, "LEGATO" },
1076         { 0x0233, "NMS Agent/NetwareManagementAgent" },
1077         { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" },
1078         { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" },
1079         { 0x023a, "LANtern" },
1080         { 0x023c, "MAVERICK" },
1081         { 0x023f, "NovellSMDR" },
1082         { 0x024e, "NetwareConnect" },
1083         { 0x024f, "NASI ServerBroadcast Cisco" },
1084         { 0x026a, "NMS ServiceConsole" },
1085         { 0x026b, "TimeSynchronizationServer Netware 4.x" },
1086         { 0x0278, "DirectoryServer Netware 4.x" },
1087         { 0x027b, "NetwareManagementAgent" },
1088         { 0x0280, "Novell File and Printer Sharing Service for PC" },
1089         { 0x0304, "NovellSAA Gateway" },
1090         { 0x0308, "COM/VERMED" },
1091         { 0x030a, "GalacticommWorldgroupServer" },
1092         { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" },
1093         { 0x0320, "AttachmateGateway" },
1094         { 0x0327, "MicrosoftDiagnostiocs" },
1095         { 0x0328, "WATCOM SQL Server" },
1096         { 0x0335, "MultiTechSystems MultisynchCommServer" },
1097         { 0x0343, "Xylogics RemoteAccessServer/LANModem" },
1098         { 0x0355, "ArcadaBackupExec" },
1099         { 0x0358, "MSLCD1" },
1100         { 0x0361, "NETINELO" },
1101         { 0x037e, "Powerchute UPS Monitoring" },
1102         { 0x037f, "ViruSafeNotify" },
1103         { 0x0386, "HP Bridge" },
1104         { 0x0387, "HP Hub" },
1105         { 0x0394, "NetWare SAA Gateway" },
1106         { 0x039b, "LotusNotes" },
1107         { 0x03b7, "CertusAntiVirus" },
1108         { 0x03c4, "ARCserve4.0" },
1109         { 0x03c7, "LANspool3.5" },
1110         { 0x03d7, "LexmarkPrinterServer" },
1111         { 0x03d8, "LexmarkXLE PrinterServer" },
1112         { 0x03dd, "BanyanENS NetwareClient" },
1113         { 0x03de, "GuptaSequelBaseServer/NetWareSQL" },
1114         { 0x03e1, "UnivelUnixware" },
1115         { 0x03e4, "UnivelUnixware" },
1116         { 0x03fc, "IntelNetport" },
1117         { 0x03fd, "PrintServerQueue" },
1118         { 0x040A, "ipnServer" },
1119         { 0x040D, "LVERRMAN" },
1120         { 0x040E, "LVLIC" },
1121         { 0x0414, "NET Silicon (DPI)/Kyocera" },
1122         { 0x0429, "SiteLockVirus" },
1123         { 0x0432, "UFHELPR???" },
1124         { 0x0433, "Synoptics281xAdvancedSNMPAgent" },
1125         { 0x0444, "MicrosoftNT SNA Server" },
1126         { 0x0448, "Oracle" },
1127         { 0x044c, "ARCserve5.01" },
1128         { 0x0457, "CanonGP55" },
1129         { 0x045a, "QMS Printers" },
1130         { 0x045b, "DellSCSI Array" },
1131         { 0x0491, "NetBlazerModems" },
1132         { 0x04ac, "OnTimeScheduler" },
1133         { 0x04b0, "CD-Net" },
1134         { 0x0513, "EmulexNQA" },
1135         { 0x0520, "SiteLockChecks" },
1136         { 0x0529, "SiteLockChecks" },
1137         { 0x052d, "CitrixOS2 AppServer" },
1138         { 0x0535, "Tektronix" },
1139         { 0x0536, "Milan" },
1140         { 0x055d, "Attachmate SNA gateway" },
1141         { 0x056b, "IBM8235 ModemServer" },
1142         { 0x056c, "ShivaLanRover/E PLUS" },
1143         { 0x056d, "ShivaLanRover/T PLUS" },
1144         { 0x0580, "McAfeeNetShield" },
1145         { 0x05B8, "NLM to workstation communication (Revelation Software)" },
1146         { 0x05BA, "CompatibleSystemsRouters" },
1147         { 0x05BE, "CheyenneHierarchicalStorageManager" },
1148         { 0x0606, "JCWatermarkImaging" },
1149         { 0x060c, "AXISNetworkPrinter" },
1150         { 0x0610, "AdaptecSCSIManagement" },
1151         { 0x0621, "IBM AntiVirus" },
1152         { 0x0640, "Windows95 RemoteRegistryService" },
1153         { 0x064e, "MicrosoftIIS" },
1154         { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1155         { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1156         { 0x076C, "Xerox" },
1157         { 0x079b, "ShivaLanRover/E 115" },
1158         { 0x079c, "ShivaLanRover/T 115" },
1159         { 0x07B4, "CubixWorldDesk" },
1160         { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" },
1161         { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" },
1162         { 0x0810, "ELAN License Server Demo" },
1163         { 0x0824, "ShivaLanRoverAccessSwitch/E" },
1164         { 0x086a, "ISSC Collector" },
1165         { 0x087f, "ISSC DAS AgentAIX" },
1166         { 0x0880, "Intel Netport PRO" },
1167         { 0x0881, "Intel Netport PRO" },
1168         { 0x0b29, "SiteLock" },
1169         { 0x0c29, "SiteLockApplications" },
1170         { 0x0c2c, "LicensingServer" },
1171         { 0x2101, "PerformanceTechnologyInstantInternet" },
1172         { 0x2380, "LAI SiteLock" },
1173         { 0x238c, "MeetingMaker" },
1174         { 0x4808, "SiteLockServer/SiteLockMetering" },
1175         { 0x5555, "SiteLockUser" },
1176         { 0x6312, "Tapeware" },
1177         { 0x6f00, "RabbitGateway" },
1178         { 0x7703, "MODEM" },
1179         { 0x8002, "NetPortPrinters" },
1180         { 0x8008, "WordPerfectNetworkVersion" },
1181         { 0x85BE, "Cisco EIGRP" },
1182         { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" },
1183         { 0x9000, "McAfeeNetShield" },
1184         { 0x9604, "CSA-NT_MON" },
1185         { 0xb6a8, "OceanIsleReachoutRemoteControl" },
1186         { 0xf11f, "SiteLockMetering" },
1187         { 0xf1ff, "SiteLock" },
1188         { 0xf503, "Microsoft SQL Server" },
1189         { 0xF905, "IBM TimeAndPlace" },
1190         { 0xfbfb, "TopCallIII FaxServer" },
1191         { 0xffff, "AnyService/Wildcard" },
1192         { 0, (char *)0 }
1193 };
1194
1195 static void
1196 init_ipxsaparray(netdissect_options *ndo)
1197 {
1198         register int i;
1199         register struct hnamemem *table;
1200
1201         for (i = 0; ipxsap_db[i].s != NULL; i++) {
1202                 int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1);
1203                 table = &ipxsaptable[j];
1204                 while (table->name)
1205                         table = table->nxt;
1206                 table->name = ipxsap_db[i].s;
1207                 table->addr = htons(ipxsap_db[i].v);
1208                 table->nxt = newhnamemem(ndo);
1209         }
1210 }
1211
1212 /*
1213  * Initialize the address to name translation machinery.  We map all
1214  * non-local IP addresses to numeric addresses if ndo->ndo_fflag is true
1215  * (i.e., to prevent blocking on the nameserver).  localnet is the IP address
1216  * of the local network.  mask is its subnet mask.
1217  */
1218 void
1219 init_addrtoname(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
1220 {
1221         if (ndo->ndo_fflag) {
1222                 f_localnet = localnet;
1223                 f_netmask = mask;
1224         }
1225         if (ndo->ndo_nflag)
1226                 /*
1227                  * Simplest way to suppress names.
1228                  */
1229                 return;
1230
1231         init_etherarray(ndo);
1232         init_servarray(ndo);
1233         init_eprotoarray(ndo);
1234         init_protoidarray(ndo);
1235         init_ipxsaparray(ndo);
1236 }
1237
1238 const char *
1239 dnaddr_string(netdissect_options *ndo, u_short dnaddr)
1240 {
1241         register struct hnamemem *tp;
1242
1243         for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != NULL;
1244              tp = tp->nxt)
1245                 if (tp->addr == dnaddr)
1246                         return (tp->name);
1247
1248         tp->addr = dnaddr;
1249         tp->nxt = newhnamemem(ndo);
1250         if (ndo->ndo_nflag)
1251                 tp->name = dnnum_string(ndo, dnaddr);
1252         else
1253                 tp->name = dnname_string(ndo, dnaddr);
1254
1255         return(tp->name);
1256 }
1257
1258 /* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */
1259 struct hnamemem *
1260 newhnamemem(netdissect_options *ndo)
1261 {
1262         register struct hnamemem *p;
1263         static struct hnamemem *ptr = NULL;
1264         static u_int num = 0;
1265
1266         if (num  <= 0) {
1267                 num = 64;
1268                 ptr = (struct hnamemem *)calloc(num, sizeof (*ptr));
1269                 if (ptr == NULL)
1270                         (*ndo->ndo_error)(ndo, "newhnamemem: calloc");
1271         }
1272         --num;
1273         p = ptr++;
1274         return (p);
1275 }
1276
1277 /* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */
1278 struct h6namemem *
1279 newh6namemem(netdissect_options *ndo)
1280 {
1281         register struct h6namemem *p;
1282         static struct h6namemem *ptr = NULL;
1283         static u_int num = 0;
1284
1285         if (num  <= 0) {
1286                 num = 64;
1287                 ptr = (struct h6namemem *)calloc(num, sizeof (*ptr));
1288                 if (ptr == NULL)
1289                         (*ndo->ndo_error)(ndo, "newh6namemem: calloc");
1290         }
1291         --num;
1292         p = ptr++;
1293         return (p);
1294 }
1295
1296 /* Represent TCI part of the 802.1Q 4-octet tag as text. */
1297 const char *
1298 ieee8021q_tci_string(const uint16_t tci)
1299 {
1300         static char buf[128];
1301         snprintf(buf, sizeof(buf), "vlan %u, p %u%s",
1302                  tci & 0xfff,
1303                  tci >> 13,
1304                  (tci & 0x1000) ? ", DEI" : "");
1305         return buf;
1306 }