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 #ifndef lint
  25 static const char rcsid[] _U_ =
  26     "@(#) $Header: /tcpdump/master/tcpdump/addrtoname.c,v 1.101 2004-01-27 23:03:11 guy Exp $ (LBL)";
  27 #endif
  28
  29 #ifdef HAVE_CONFIG_H
  30 #include "config.h"
  31 #endif
  32
  33 #include <tcpdump-stdinc.h>
  34
  35 #ifdef USE_ETHER_NTOHOST
  36 #ifdef HAVE_NETINET_IF_ETHER_H
  37 struct mbuf;            /* Squelch compiler warnings on some platforms for */
  38 struct rtentry;         /* declarations in <net/if.h> */
  39 #include <net/if.h>     /* for "struct ifnet" in "struct arpcom" on Solaris */
  40 #include <netinet/if_ether.h>
  41 #endif /* HAVE_NETINET_IF_ETHER_H */
  42 #ifdef HAVE_NETINET_ETHER_H
  43 #include <netinet/ether.h>  /* ether_ntohost on linux */
  44 #endif /* HAVE_NETINET_ETHER_H */
  45 #endif /* USE_ETHER_NTOHOST */
  46
  47 #include <pcap.h>
  48 #include <pcap-namedb.h>
  49 #include <signal.h>
  50 #include <stdio.h>
  51 #include <string.h>
  52 #include <stdlib.h>
  53
  54 #include "interface.h"
  55 #include "addrtoname.h"
  56 #include "llc.h"
  57 #include "setsignal.h"
  58
  59 /*
  60  * hash tables for whatever-to-name translations
  61  *
  62  * XXX there has to be error checks against strdup(3) failure
  63  */
  64
  65 #define HASHNAMESIZE 4096
  66
  67 struct hnamemem {
  68         u_int32_t addr;
  69         const char *name;
  70         struct hnamemem *nxt;
  71 };
  72
  73 struct hnamemem hnametable[HASHNAMESIZE];
  74 struct hnamemem tporttable[HASHNAMESIZE];
  75 struct hnamemem uporttable[HASHNAMESIZE];
  76 struct hnamemem eprototable[HASHNAMESIZE];
  77 struct hnamemem dnaddrtable[HASHNAMESIZE];
  78 struct hnamemem llcsaptable[HASHNAMESIZE];
  79 struct hnamemem ipxsaptable[HASHNAMESIZE];
  80
  81 #if defined(INET6) && defined(WIN32)
  82 /*
  83  * fake gethostbyaddr for Win2k/XP
  84  * gethostbyaddr() returns incorrect value when AF_INET6 is passed
  85  * to 3rd argument.
  86  *
  87  * h_name in struct hostent is only valid.
  88  */
  89 static struct hostent *
  90 win32_gethostbyaddr(const char *addr, int len, int type)
  91 {
  92         static struct hostent host;
  93         static char hostbuf[NI_MAXHOST];
  94         char hname[NI_MAXHOST];
  95         struct sockaddr_in6 addr6;
  96
  97         host.h_name = hostbuf;
  98         switch (type) {
  99         case AF_INET:
 100                 return gethostbyaddr(addr, len, type);
 101                 break;
 102         case AF_INET6:
 103                 memset(&addr6, 0, sizeof(addr6));
 104                 addr6.sin6_family = AF_INET6;
 105                 memcpy(&addr6.sin6_addr, addr, len);
 106 #ifdef __MINGW32__
 107                 /* MinGW doesn't provide getnameinfo */
 108                 return NULL;
 109 #else
 110                 if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6),
 111                         hname, sizeof(hname), NULL, 0, 0)) {
 112                     return NULL;
 113                 } else {
 114                         strcpy(host.h_name, hname);
 115                         return &host;
 116                 }
 117 #endif /* __MINGW32__ */
 118                 break;
 119         default:
 120                 return NULL;
 121         }
 122 }
 123 #define gethostbyaddr win32_gethostbyaddr
 124 #endif /* INET6 & WIN32*/
 125
 126 #ifdef INET6
 127 struct h6namemem {
 128         struct in6_addr addr;
 129         char *name;
 130         struct h6namemem *nxt;
 131 };
 132
 133 struct h6namemem h6nametable[HASHNAMESIZE];
 134 #endif /* INET6 */
 135
 136 struct enamemem {
 137         u_short e_addr0;
 138         u_short e_addr1;
 139         u_short e_addr2;
 140         const char *e_name;
 141         u_char *e_nsap;                 /* used only for nsaptable[] */
 142 #define e_bs e_nsap                     /* for bytestringtable */
 143         struct enamemem *e_nxt;
 144 };
 145
 146 struct enamemem enametable[HASHNAMESIZE];
 147 struct enamemem nsaptable[HASHNAMESIZE];
 148 struct enamemem bytestringtable[HASHNAMESIZE];
 149
 150 struct protoidmem {
 151         u_int32_t p_oui;
 152         u_short p_proto;
 153         const char *p_name;
 154         struct protoidmem *p_nxt;
 155 };
 156
 157 struct protoidmem protoidtable[HASHNAMESIZE];
 158
 159 /*
 160  * A faster replacement for inet_ntoa().
 161  */
 162 const char *
 163 intoa(u_int32_t addr)
 164 {
 165         register char *cp;
 166         register u_int byte;
 167         register int n;
 168         static char buf[sizeof(".xxx.xxx.xxx.xxx")];
 169
 170         NTOHL(addr);
 171         cp = &buf[sizeof buf];
 172         *--cp = '\0';
 173
 174         n = 4;
 175         do {
 176                 byte = addr & 0xff;
 177                 *--cp = byte % 10 + '0';
 178                 byte /= 10;
 179                 if (byte > 0) {
 180                         *--cp = byte % 10 + '0';
 181                         byte /= 10;
 182                         if (byte > 0)
 183                                 *--cp = byte + '0';
 184                 }
 185                 *--cp = '.';
 186                 addr >>= 8;
 187         } while (--n > 0);
 188
 189         return cp + 1;
 190 }
 191
 192 static u_int32_t f_netmask;
 193 static u_int32_t f_localnet;
 194
 195 /*
 196  * Return a name for the IP address pointed to by ap.  This address
 197  * is assumed to be in network byte order.
 198  */
 199 const char *
 200 getname(const u_char *ap)
 201 {
 202         register struct hostent *hp;
 203         u_int32_t addr;
 204         static struct hnamemem *p;              /* static for longjmp() */
 205
 206         memcpy(&addr, ap, sizeof(addr));
 207         p = &hnametable[addr & (HASHNAMESIZE-1)];
 208         for (; p->nxt; p = p->nxt) {
 209                 if (p->addr == addr)
 210                         return (p->name);
 211         }
 212         p->addr = addr;
 213         p->nxt = newhnamemem();
 214
 215         /*
 216          * Print names unless:
 217          *      (1) -n was given.
 218          *      (2) Address is foreign and -f was given. (If -f was not
 219          *          given, f_netmask and f_localnet are 0 and the test
 220          *          evaluates to true)
 221          */
 222         if (!nflag &&
 223             (addr & f_netmask) == f_localnet) {
 224                 hp = gethostbyaddr((char *)&addr, 4, AF_INET);
 225                 if (hp) {
 226                         char *dotp;
 227
 228                         p->name = strdup(hp->h_name);
 229                         if (Nflag) {
 230                                 /* Remove domain qualifications */
 231                                 dotp = strchr(p->name, '.');
 232                                 if (dotp)
 233                                         *dotp = '\0';
 234                         }
 235                         return (p->name);
 236                 }
 237         }
 238         p->name = strdup(intoa(addr));
 239         return (p->name);
 240 }
 241
 242 #ifdef INET6
 243 /*
 244  * Return a name for the IP6 address pointed to by ap.  This address
 245  * is assumed to be in network byte order.
 246  */
 247 const char *
 248 getname6(const u_char *ap)
 249 {
 250         register struct hostent *hp;
 251         struct in6_addr addr;
 252         static struct h6namemem *p;             /* static for longjmp() */
 253         register const char *cp;
 254         char ntop_buf[INET6_ADDRSTRLEN];
 255
 256         memcpy(&addr, ap, sizeof(addr));
 257         p = &h6nametable[*(u_int16_t *)&addr.s6_addr[14] & (HASHNAMESIZE-1)];
 258         for (; p->nxt; p = p->nxt) {
 259                 if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
 260                         return (p->name);
 261         }
 262         p->addr = addr;
 263         p->nxt = newh6namemem();
 264
 265         /*
 266          * Do not print names if -n was given.
 267          */
 268         if (!nflag) {
 269                 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET6);
 270                 if (hp) {
 271                         char *dotp;
 272
 273                         p->name = strdup(hp->h_name);
 274                         if (Nflag) {
 275                                 /* Remove domain qualifications */
 276                                 dotp = strchr(p->name, '.');
 277                                 if (dotp)
 278                                         *dotp = '\0';
 279                         }
 280                         return (p->name);
 281                 }
 282         }
 283         cp = inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf));
 284         p->name = strdup(cp);
 285         return (p->name);
 286 }
 287 #endif /* INET6 */
 288
 289 static char hex[] = "0123456789abcdef";
 290
 291
 292 /* Find the hash node that corresponds the ether address 'ep' */
 293
 294 static inline struct enamemem *
 295 lookup_emem(const u_char *ep)
 296 {
 297         register u_int i, j, k;
 298         struct enamemem *tp;
 299
 300         k = (ep[0] << 8) | ep[1];
 301         j = (ep[2] << 8) | ep[3];
 302         i = (ep[4] << 8) | ep[5];
 303
 304         tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
 305         while (tp->e_nxt)
 306                 if (tp->e_addr0 == i &&
 307                     tp->e_addr1 == j &&
 308                     tp->e_addr2 == k)
 309                         return tp;
 310                 else
 311                         tp = tp->e_nxt;
 312         tp->e_addr0 = i;
 313         tp->e_addr1 = j;
 314         tp->e_addr2 = k;
 315         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 316         if (tp->e_nxt == NULL)
 317                 error("lookup_emem: calloc");
 318
 319         return tp;
 320 }
 321
 322 /*
 323  * Find the hash node that corresponds to the bytestring 'bs'
 324  * with length 'nlen'
 325  */
 326
 327 static inline struct enamemem *
 328 lookup_bytestring(register const u_char *bs, const unsigned int nlen)
 329 {
 330         struct enamemem *tp;
 331         register u_int i, j, k;
 332
 333         if (nlen >= 6) {
 334                 k = (bs[0] << 8) | bs[1];
 335                 j = (bs[2] << 8) | bs[3];
 336                 i = (bs[4] << 8) | bs[5];
 337         } else if (nlen >= 4) {
 338                 k = (bs[0] << 8) | bs[1];
 339                 j = (bs[2] << 8) | bs[3];
 340                 i = 0;
 341         } else
 342                 i = j = k = 0;
 343
 344         tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)];
 345         while (tp->e_nxt)
 346                 if (tp->e_addr0 == i &&
 347                     tp->e_addr1 == j &&
 348                     tp->e_addr2 == k &&
 349                     memcmp((const char *)bs, (const char *)(tp->e_bs), nlen) == 0)
 350                         return tp;
 351                 else
 352                         tp = tp->e_nxt;
 353
 354         tp->e_addr0 = i;
 355         tp->e_addr1 = j;
 356         tp->e_addr2 = k;
 357
 358         tp->e_bs = (u_char *) calloc(1, nlen + 1);
 359         memcpy(tp->e_bs, bs, nlen);
 360         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 361         if (tp->e_nxt == NULL)
 362                 error("lookup_bytestring: calloc");
 363
 364         return tp;
 365 }
 366
 367 /* Find the hash node that corresponds the NSAP 'nsap' */
 368
 369 static inline struct enamemem *
 370 lookup_nsap(register const u_char *nsap)
 371 {
 372         register u_int i, j, k;
 373         unsigned int nlen = *nsap;
 374         struct enamemem *tp;
 375         const u_char *ensap = nsap + nlen - 6;
 376
 377         if (nlen > 6) {
 378                 k = (ensap[0] << 8) | ensap[1];
 379                 j = (ensap[2] << 8) | ensap[3];
 380                 i = (ensap[4] << 8) | ensap[5];
 381         }
 382         else
 383                 i = j = k = 0;
 384
 385         tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
 386         while (tp->e_nxt)
 387                 if (tp->e_addr0 == i &&
 388                     tp->e_addr1 == j &&
 389                     tp->e_addr2 == k &&
 390                     tp->e_nsap[0] == nlen &&
 391                     memcmp((const char *)&(nsap[1]),
 392                         (char *)&(tp->e_nsap[1]), nlen) == 0)
 393                         return tp;
 394                 else
 395                         tp = tp->e_nxt;
 396         tp->e_addr0 = i;
 397         tp->e_addr1 = j;
 398         tp->e_addr2 = k;
 399         tp->e_nsap = (u_char *)malloc(nlen + 1);
 400         if (tp->e_nsap == NULL)
 401                 error("lookup_nsap: malloc");
 402         memcpy((char *)tp->e_nsap, (const char *)nsap, nlen + 1);
 403         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 404         if (tp->e_nxt == NULL)
 405                 error("lookup_nsap: calloc");
 406
 407         return tp;
 408 }
 409
 410 /* Find the hash node that corresponds the protoid 'pi'. */
 411
 412 static inline struct protoidmem *
 413 lookup_protoid(const u_char *pi)
 414 {
 415         register u_int i, j;
 416         struct protoidmem *tp;
 417
 418         /* 5 octets won't be aligned */
 419         i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
 420         j =   (pi[3] << 8) + pi[4];
 421         /* XXX should be endian-insensitive, but do big-endian testing  XXX */
 422
 423         tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
 424         while (tp->p_nxt)
 425                 if (tp->p_oui == i && tp->p_proto == j)
 426                         return tp;
 427                 else
 428                         tp = tp->p_nxt;
 429         tp->p_oui = i;
 430         tp->p_proto = j;
 431         tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
 432         if (tp->p_nxt == NULL)
 433                 error("lookup_protoid: calloc");
 434
 435         return tp;
 436 }
 437
 438 const char *
 439 etheraddr_string(register const u_char *ep)
 440 {
 441         register u_int i;
 442         register char *cp;
 443         register struct enamemem *tp;
 444         char buf[sizeof("00:00:00:00:00:00")];
 445
 446         tp = lookup_emem(ep);
 447         if (tp->e_name)
 448                 return (tp->e_name);
 449 #ifdef USE_ETHER_NTOHOST
 450         if (!nflag) {
 451                 char buf2[128];
 452                 if (ether_ntohost(buf2, (const struct ether_addr *)ep) == 0) {
 453                         tp->e_name = strdup(buf2);
 454                         return (tp->e_name);
 455                 }
 456         }
 457 #endif
 458         cp = buf;
 459         *cp++ = hex[*ep >> 4 ];
 460         *cp++ = hex[*ep++ & 0xf];
 461         for (i = 5; (int)--i >= 0;) {
 462                 *cp++ = ':';
 463                 *cp++ = hex[*ep >> 4 ];
 464                 *cp++ = hex[*ep++ & 0xf];
 465         }
 466         *cp = '\0';
 467         tp->e_name = strdup(buf);
 468         return (tp->e_name);
 469 }
 470
 471 const char *
 472 linkaddr_string(const u_char *ep, const unsigned int len)
 473 {
 474         register u_int i, j;
 475         register char *cp;
 476         register struct enamemem *tp;
 477
 478         if (len == 6)   /* XXX not totally correct... */
 479                 return etheraddr_string(ep);
 480
 481         tp = lookup_bytestring(ep, len);
 482         if (tp->e_name)
 483                 return (tp->e_name);
 484
 485         tp->e_name = cp = (char *)malloc(len*3);
 486         if (tp->e_name == NULL)
 487                 error("linkaddr_string: malloc");
 488         if ((j = *ep >> 4) != 0)
 489                 *cp++ = hex[j];
 490         *cp++ = hex[*ep++ & 0xf];
 491         for (i = len-1; i > 0 ; --i) {
 492                 *cp++ = ':';
 493                 if ((j = *ep >> 4) != 0)
 494                         *cp++ = hex[j];
 495                 *cp++ = hex[*ep++ & 0xf];
 496         }
 497         *cp = '\0';
 498         return (tp->e_name);
 499 }
 500
 501 const char *
 502 etherproto_string(u_short port)
 503 {
 504         register char *cp;
 505         register struct hnamemem *tp;
 506         register u_int32_t i = port;
 507         char buf[sizeof("0000")];
 508
 509         for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 510                 if (tp->addr == i)
 511                         return (tp->name);
 512
 513         tp->addr = i;
 514         tp->nxt = newhnamemem();
 515
 516         cp = buf;
 517         NTOHS(port);
 518         *cp++ = hex[port >> 12 & 0xf];
 519         *cp++ = hex[port >> 8 & 0xf];
 520         *cp++ = hex[port >> 4 & 0xf];
 521         *cp++ = hex[port & 0xf];
 522         *cp++ = '\0';
 523         tp->name = strdup(buf);
 524         return (tp->name);
 525 }
 526
 527 const char *
 528 protoid_string(register const u_char *pi)
 529 {
 530         register u_int i, j;
 531         register char *cp;
 532         register struct protoidmem *tp;
 533         char buf[sizeof("00:00:00:00:00")];
 534
 535         tp = lookup_protoid(pi);
 536         if (tp->p_name)
 537                 return tp->p_name;
 538
 539         cp = buf;
 540         if ((j = *pi >> 4) != 0)
 541                 *cp++ = hex[j];
 542         *cp++ = hex[*pi++ & 0xf];
 543         for (i = 4; (int)--i >= 0;) {
 544                 *cp++ = ':';
 545                 if ((j = *pi >> 4) != 0)
 546                         *cp++ = hex[j];
 547                 *cp++ = hex[*pi++ & 0xf];
 548         }
 549         *cp = '\0';
 550         tp->p_name = strdup(buf);
 551         return (tp->p_name);
 552 }
 553
 554 const char *
 555 llcsap_string(u_char sap)
 556 {
 557         register struct hnamemem *tp;
 558         register u_int32_t i = sap;
 559         char buf[sizeof("sap 00")];
 560
 561         for (tp = &llcsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 562                 if (tp->addr == i)
 563                         return (tp->name);
 564
 565         tp->addr = i;
 566         tp->nxt = newhnamemem();
 567
 568         snprintf(buf, sizeof(buf), "sap %02x", sap & 0xff);
 569         tp->name = strdup(buf);
 570         return (tp->name);
 571 }
 572
 573 const char *
 574 isonsap_string(const u_char *nsap)
 575 {
 576         register u_int i, nlen = nsap[0];
 577         register char *cp;
 578         register struct enamemem *tp;
 579
 580         tp = lookup_nsap(nsap);
 581         if (tp->e_name)
 582                 return tp->e_name;
 583
 584         tp->e_name = cp = (char *)malloc(nlen * 2 + 2);
 585         if (cp == NULL)
 586                 error("isonsap_string: malloc");
 587
 588         nsap++;
 589         *cp++ = '/';
 590         for (i = nlen; (int)--i >= 0;) {
 591                 *cp++ = hex[*nsap >> 4];
 592                 *cp++ = hex[*nsap++ & 0xf];
 593         }
 594         *cp = '\0';
 595         return (tp->e_name);
 596 }
 597
 598 const char *
 599 tcpport_string(u_short port)
 600 {
 601         register struct hnamemem *tp;
 602         register u_int32_t i = port;
 603         char buf[sizeof("00000")];
 604
 605         for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 606                 if (tp->addr == i)
 607                         return (tp->name);
 608
 609         tp->addr = i;
 610         tp->nxt = newhnamemem();
 611
 612         (void)snprintf(buf, sizeof(buf), "%u", i);
 613         tp->name = strdup(buf);
 614         return (tp->name);
 615 }
 616
 617 const char *
 618 udpport_string(register u_short port)
 619 {
 620         register struct hnamemem *tp;
 621         register u_int32_t i = port;
 622         char buf[sizeof("00000")];
 623
 624         for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 625                 if (tp->addr == i)
 626                         return (tp->name);
 627
 628         tp->addr = i;
 629         tp->nxt = newhnamemem();
 630
 631         (void)snprintf(buf, sizeof(buf), "%u", i);
 632         tp->name = strdup(buf);
 633         return (tp->name);
 634 }
 635
 636 const char *
 637 ipxsap_string(u_short port)
 638 {
 639         register char *cp;
 640         register struct hnamemem *tp;
 641         register u_int32_t i = port;
 642         char buf[sizeof("0000")];
 643
 644         for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 645                 if (tp->addr == i)
 646                         return (tp->name);
 647
 648         tp->addr = i;
 649         tp->nxt = newhnamemem();
 650
 651         cp = buf;
 652         NTOHS(port);
 653         *cp++ = hex[port >> 12 & 0xf];
 654         *cp++ = hex[port >> 8 & 0xf];
 655         *cp++ = hex[port >> 4 & 0xf];
 656         *cp++ = hex[port & 0xf];
 657         *cp++ = '\0';
 658         tp->name = strdup(buf);
 659         return (tp->name);
 660 }
 661
 662 static void
 663 init_servarray(void)
 664 {
 665         struct servent *sv;
 666         register struct hnamemem *table;
 667         register int i;
 668         char buf[sizeof("0000000000")];
 669
 670         while ((sv = getservent()) != NULL) {
 671                 int port = ntohs(sv->s_port);
 672                 i = port & (HASHNAMESIZE-1);
 673                 if (strcmp(sv->s_proto, "tcp") == 0)
 674                         table = &tporttable[i];
 675                 else if (strcmp(sv->s_proto, "udp") == 0)
 676                         table = &uporttable[i];
 677                 else
 678                         continue;
 679
 680                 while (table->name)
 681                         table = table->nxt;
 682                 if (nflag) {
 683                         (void)snprintf(buf, sizeof(buf), "%d", port);
 684                         table->name = strdup(buf);
 685                 } else
 686                         table->name = strdup(sv->s_name);
 687                 table->addr = port;
 688                 table->nxt = newhnamemem();
 689         }
 690         endservent();
 691 }
 692
 693 /*XXX from libbpfc.a */
 694 #ifndef WIN32
 695 extern struct eproto {
 696 #else
 697 __declspec( dllimport) struct eproto {
 698 #endif
 699         char *s;
 700         u_short p;
 701 } eproto_db[];
 702
 703 static void
 704 init_eprotoarray(void)
 705 {
 706         register int i;
 707         register struct hnamemem *table;
 708
 709         for (i = 0; eproto_db[i].s; i++) {
 710                 int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
 711                 table = &eprototable[j];
 712                 while (table->name)
 713                         table = table->nxt;
 714                 table->name = eproto_db[i].s;
 715                 table->addr = htons(eproto_db[i].p);
 716                 table->nxt = newhnamemem();
 717         }
 718 }
 719
 720 static struct protoidlist {
 721         const u_char protoid[5];
 722         const char *name;
 723 } protoidlist[] = {
 724         {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
 725         {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
 726         {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
 727         {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
 728         {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
 729         {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 730 };
 731
 732 /*
 733  * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
 734  * types.
 735  */
 736 static void
 737 init_protoidarray(void)
 738 {
 739         register int i;
 740         register struct protoidmem *tp;
 741         struct protoidlist *pl;
 742         u_char protoid[5];
 743
 744         protoid[0] = 0;
 745         protoid[1] = 0;
 746         protoid[2] = 0;
 747         for (i = 0; eproto_db[i].s; i++) {
 748                 u_short etype = htons(eproto_db[i].p);
 749
 750                 memcpy((char *)&protoid[3], (char *)&etype, 2);
 751                 tp = lookup_protoid(protoid);
 752                 tp->p_name = strdup(eproto_db[i].s);
 753         }
 754         /* Hardwire some SNAP proto ID names */
 755         for (pl = protoidlist; pl->name != NULL; ++pl) {
 756                 tp = lookup_protoid(pl->protoid);
 757                 /* Don't override existing name */
 758                 if (tp->p_name != NULL)
 759                         continue;
 760
 761                 tp->p_name = pl->name;
 762         }
 763 }
 764
 765 static struct etherlist {
 766         const u_char addr[6];
 767         const char *name;
 768 } etherlist[] = {
 769         {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
 770         {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 771 };
 772
 773 /*
 774  * Initialize the ethers hash table.  We take two different approaches
 775  * depending on whether or not the system provides the ethers name
 776  * service.  If it does, we just wire in a few names at startup,
 777  * and etheraddr_string() fills in the table on demand.  If it doesn't,
 778  * then we suck in the entire /etc/ethers file at startup.  The idea
 779  * is that parsing the local file will be fast, but spinning through
 780  * all the ethers entries via NIS & next_etherent might be very slow.
 781  *
 782  * XXX pcap_next_etherent doesn't belong in the pcap interface, but
 783  * since the pcap module already does name-to-address translation,
 784  * it's already does most of the work for the ethernet address-to-name
 785  * translation, so we just pcap_next_etherent as a convenience.
 786  */
 787 static void
 788 init_etherarray(void)
 789 {
 790         register struct etherlist *el;
 791         register struct enamemem *tp;
 792 #ifdef USE_ETHER_NTOHOST
 793         char name[256];
 794 #else
 795         register struct pcap_etherent *ep;
 796         register FILE *fp;
 797
 798         /* Suck in entire ethers file */
 799         fp = fopen(PCAP_ETHERS_FILE, "r");
 800         if (fp != NULL) {
 801                 while ((ep = pcap_next_etherent(fp)) != NULL) {
 802                         tp = lookup_emem(ep->addr);
 803                         tp->e_name = strdup(ep->name);
 804                 }
 805                 (void)fclose(fp);
 806         }
 807 #endif
 808
 809         /* Hardwire some ethernet names */
 810         for (el = etherlist; el->name != NULL; ++el) {
 811                 tp = lookup_emem(el->addr);
 812                 /* Don't override existing name */
 813                 if (tp->e_name != NULL)
 814                         continue;
 815
 816 #ifdef USE_ETHER_NTOHOST
 817                 /* Use yp/nis version of name if available */
 818                 if (ether_ntohost(name, (const struct ether_addr *)el->addr) == 0) {
 819                         tp->e_name = strdup(name);
 820                         continue;
 821                 }
 822 #endif
 823                 tp->e_name = el->name;
 824         }
 825 }
 826
 827 static struct tok llcsap_db[] = {
 828         { LLCSAP_NULL,          "null" },
 829         { LLCSAP_8021B_I,       "802.1b-gsap" },
 830         { LLCSAP_8021B_G,       "802.1b-isap" },
 831         { LLCSAP_IP,            "ip-sap" },
 832         { LLCSAP_PROWAYNM,      "proway-nm" },
 833         { LLCSAP_8021D,         "802.1d" },
 834         { LLCSAP_RS511,         "eia-rs511" },
 835         { LLCSAP_ISO8208,       "x.25/llc2" },
 836         { LLCSAP_PROWAY,        "proway" },
 837         { LLCSAP_SNAP,          "snap" },
 838         { LLCSAP_IPX,           "IPX" },
 839         { LLCSAP_NETBEUI,       "netbeui" },
 840         { LLCSAP_ISONS,         "iso-clns" },
 841         { LLCSAP_GLOBAL,        "global" },
 842         { 0,                    NULL }
 843 };
 844
 845 static void
 846 init_llcsaparray(void)
 847 {
 848         register int i;
 849         register struct hnamemem *table;
 850
 851         for (i = 0; llcsap_db[i].s != NULL; i++) {
 852                 table = &llcsaptable[llcsap_db[i].v];
 853                 while (table->name)
 854                         table = table->nxt;
 855                 table->name = llcsap_db[i].s;
 856                 table->addr = llcsap_db[i].v;
 857                 table->nxt = newhnamemem();
 858         }
 859 }
 860
 861 static struct tok ipxsap_db[] = {
 862         { 0x0000, "Unknown" },
 863         { 0x0001, "User" },
 864         { 0x0002, "User Group" },
 865         { 0x0003, "PrintQueue" },
 866         { 0x0004, "FileServer" },
 867         { 0x0005, "JobServer" },
 868         { 0x0006, "Gateway" },
 869         { 0x0007, "PrintServer" },
 870         { 0x0008, "ArchiveQueue" },
 871         { 0x0009, "ArchiveServer" },
 872         { 0x000a, "JobQueue" },
 873         { 0x000b, "Administration" },
 874         { 0x000F, "Novell TI-RPC" },
 875         { 0x0017, "Diagnostics" },
 876         { 0x0020, "NetBIOS" },
 877         { 0x0021, "NAS SNA Gateway" },
 878         { 0x0023, "NACS AsyncGateway" },
 879         { 0x0024, "RemoteBridge/RoutingService" },
 880         { 0x0026, "BridgeServer" },
 881         { 0x0027, "TCP/IP Gateway" },
 882         { 0x0028, "Point-to-point X.25 BridgeServer" },
 883         { 0x0029, "3270 Gateway" },
 884         { 0x002a, "CHI Corp" },
 885         { 0x002c, "PC Chalkboard" },
 886         { 0x002d, "TimeSynchServer" },
 887         { 0x002e, "ARCserve5.0/PalindromeBackup" },
 888         { 0x0045, "DI3270 Gateway" },
 889         { 0x0047, "AdvertisingPrintServer" },
 890         { 0x004a, "NetBlazerModems" },
 891         { 0x004b, "BtrieveVAP" },
 892         { 0x004c, "NetwareSQL" },
 893         { 0x004d, "XtreeNetwork" },
 894         { 0x0050, "BtrieveVAP4.11" },
 895         { 0x0052, "QuickLink" },
 896         { 0x0053, "PrintQueueUser" },
 897         { 0x0058, "Multipoint X.25 Router" },
 898         { 0x0060, "STLB/NLM" },
 899         { 0x0064, "ARCserve" },
 900         { 0x0066, "ARCserve3.0" },
 901         { 0x0072, "WAN CopyUtility" },
 902         { 0x007a, "TES-NetwareVMS" },
 903         { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" },
 904         { 0x0095, "DDA OBGYN" },
 905         { 0x0098, "NetwareAccessServer" },
 906         { 0x009a, "Netware for VMS II/NamedPipeServer" },
 907         { 0x009b, "NetwareAccessServer" },
 908         { 0x009e, "PortableNetwareServer/SunLinkNVT" },
 909         { 0x00a1, "PowerchuteAPC UPS" },
 910         { 0x00aa, "LAWserve" },
 911         { 0x00ac, "CompaqIDA StatusMonitor" },
 912         { 0x0100, "PIPE STAIL" },
 913         { 0x0102, "LAN ProtectBindery" },
 914         { 0x0103, "OracleDataBaseServer" },
 915         { 0x0107, "Netware386/RSPX RemoteConsole" },
 916         { 0x010f, "NovellSNA Gateway" },
 917         { 0x0111, "TestServer" },
 918         { 0x0112, "HP PrintServer" },
 919         { 0x0114, "CSA MUX" },
 920         { 0x0115, "CSA LCA" },
 921         { 0x0116, "CSA CM" },
 922         { 0x0117, "CSA SMA" },
 923         { 0x0118, "CSA DBA" },
 924         { 0x0119, "CSA NMA" },
 925         { 0x011a, "CSA SSA" },
 926         { 0x011b, "CSA STATUS" },
 927         { 0x011e, "CSA APPC" },
 928         { 0x0126, "SNA TEST SSA Profile" },
 929         { 0x012a, "CSA TRACE" },
 930         { 0x012b, "NetwareSAA" },
 931         { 0x012e, "IKARUS VirusScan" },
 932         { 0x0130, "CommunicationsExecutive" },
 933         { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" },
 934         { 0x0135, "NetwareNamingServicesProfile" },
 935         { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" },
 936         { 0x0141, "LAN SpoolServer" },
 937         { 0x0152, "IRMALAN Gateway" },
 938         { 0x0154, "NamedPipeServer" },
 939         { 0x0166, "NetWareManagement" },
 940         { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" },
 941         { 0x0173, "Compaq" },
 942         { 0x0174, "Compaq SNMP Agent" },
 943         { 0x0175, "Compaq" },
 944         { 0x0180, "XTreeServer/XTreeTools" },
 945         { 0x018A, "NASI ServicesBroadcastServer" },
 946         { 0x01b0, "GARP Gateway" },
 947         { 0x01b1, "Binfview" },
 948         { 0x01bf, "IntelLanDeskManager" },
 949         { 0x01ca, "AXTEC" },
 950         { 0x01cb, "ShivaNetModem/E" },
 951         { 0x01cc, "ShivaLanRover/E" },
 952         { 0x01cd, "ShivaLanRover/T" },
 953         { 0x01ce, "ShivaUniversal" },
 954         { 0x01d8, "CastelleFAXPressServer" },
 955         { 0x01da, "CastelleLANPressPrintServer" },
 956         { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" },
 957         { 0x01f0, "LEGATO" },
 958         { 0x01f5, "LEGATO" },
 959         { 0x0233, "NMS Agent/NetwareManagementAgent" },
 960         { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" },
 961         { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" },
 962         { 0x023a, "LANtern" },
 963         { 0x023c, "MAVERICK" },
 964         { 0x023f, "NovellSMDR" },
 965         { 0x024e, "NetwareConnect" },
 966         { 0x024f, "NASI ServerBroadcast Cisco" },
 967         { 0x026a, "NMS ServiceConsole" },
 968         { 0x026b, "TimeSynchronizationServer Netware 4.x" },
 969         { 0x0278, "DirectoryServer Netware 4.x" },
 970         { 0x027b, "NetwareManagementAgent" },
 971         { 0x0280, "Novell File and Printer Sharing Service for PC" },
 972         { 0x0304, "NovellSAA Gateway" },
 973         { 0x0308, "COM/VERMED" },
 974         { 0x030a, "GalacticommWorldgroupServer" },
 975         { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" },
 976         { 0x0320, "AttachmateGateway" },
 977         { 0x0327, "MicrosoftDiagnostiocs" },
 978         { 0x0328, "WATCOM SQL Server" },
 979         { 0x0335, "MultiTechSystems MultisynchCommServer" },
 980         { 0x0343, "Xylogics RemoteAccessServer/LANModem" },
 981         { 0x0355, "ArcadaBackupExec" },
 982         { 0x0358, "MSLCD1" },
 983         { 0x0361, "NETINELO" },
 984         { 0x037e, "Powerchute UPS Monitoring" },
 985         { 0x037f, "ViruSafeNotify" },
 986         { 0x0386, "HP Bridge" },
 987         { 0x0387, "HP Hub" },
 988         { 0x0394, "NetWare SAA Gateway" },
 989         { 0x039b, "LotusNotes" },
 990         { 0x03b7, "CertusAntiVirus" },
 991         { 0x03c4, "ARCserve4.0" },
 992         { 0x03c7, "LANspool3.5" },
 993         { 0x03d7, "LexmarkPrinterServer" },
 994         { 0x03d8, "LexmarkXLE PrinterServer" },
 995         { 0x03dd, "BanyanENS NetwareClient" },
 996         { 0x03de, "GuptaSequelBaseServer/NetWareSQL" },
 997         { 0x03e1, "UnivelUnixware" },
 998         { 0x03e4, "UnivelUnixware" },
 999         { 0x03fc, "IntelNetport" },
1000         { 0x03fd, "PrintServerQueue" },
1001         { 0x040A, "ipnServer" },
1002         { 0x040D, "LVERRMAN" },
1003         { 0x040E, "LVLIC" },
1004         { 0x0414, "NET Silicon (DPI)/Kyocera" },
1005         { 0x0429, "SiteLockVirus" },
1006         { 0x0432, "UFHELPR???" },
1007         { 0x0433, "Synoptics281xAdvancedSNMPAgent" },
1008         { 0x0444, "MicrosoftNT SNA Server" },
1009         { 0x0448, "Oracle" },
1010         { 0x044c, "ARCserve5.01" },
1011         { 0x0457, "CanonGP55" },
1012         { 0x045a, "QMS Printers" },
1013         { 0x045b, "DellSCSI Array" },
1014         { 0x0491, "NetBlazerModems" },
1015         { 0x04ac, "OnTimeScheduler" },
1016         { 0x04b0, "CD-Net" },
1017         { 0x0513, "EmulexNQA" },
1018         { 0x0520, "SiteLockChecks" },
1019         { 0x0529, "SiteLockChecks" },
1020         { 0x052d, "CitrixOS2 AppServer" },
1021         { 0x0535, "Tektronix" },
1022         { 0x0536, "Milan" },
1023         { 0x055d, "Attachmate SNA gateway" },
1024         { 0x056b, "IBM8235 ModemServer" },
1025         { 0x056c, "ShivaLanRover/E PLUS" },
1026         { 0x056d, "ShivaLanRover/T PLUS" },
1027         { 0x0580, "McAfeeNetShield" },
1028         { 0x05B8, "NLM to workstation communication (Revelation Software)" },
1029         { 0x05BA, "CompatibleSystemsRouters" },
1030         { 0x05BE, "CheyenneHierarchicalStorageManager" },
1031         { 0x0606, "JCWatermarkImaging" },
1032         { 0x060c, "AXISNetworkPrinter" },
1033         { 0x0610, "AdaptecSCSIManagement" },
1034         { 0x0621, "IBM AntiVirus" },
1035         { 0x0640, "Windows95 RemoteRegistryService" },
1036         { 0x064e, "MicrosoftIIS" },
1037         { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1038         { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1039         { 0x076C, "Xerox" },
1040         { 0x079b, "ShivaLanRover/E 115" },
1041         { 0x079c, "ShivaLanRover/T 115" },
1042         { 0x07B4, "CubixWorldDesk" },
1043         { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" },
1044         { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" },
1045         { 0x0810, "ELAN License Server Demo" },
1046         { 0x0824, "ShivaLanRoverAccessSwitch/E" },
1047         { 0x086a, "ISSC Collector" },
1048         { 0x087f, "ISSC DAS AgentAIX" },
1049         { 0x0880, "Intel Netport PRO" },
1050         { 0x0881, "Intel Netport PRO" },
1051         { 0x0b29, "SiteLock" },
1052         { 0x0c29, "SiteLockApplications" },
1053         { 0x0c2c, "LicensingServer" },
1054         { 0x2101, "PerformanceTechnologyInstantInternet" },
1055         { 0x2380, "LAI SiteLock" },
1056         { 0x238c, "MeetingMaker" },
1057         { 0x4808, "SiteLockServer/SiteLockMetering" },
1058         { 0x5555, "SiteLockUser" },
1059         { 0x6312, "Tapeware" },
1060         { 0x6f00, "RabbitGateway" },
1061         { 0x7703, "MODEM" },
1062         { 0x8002, "NetPortPrinters" },
1063         { 0x8008, "WordPerfectNetworkVersion" },
1064         { 0x85BE, "Cisco EIGRP" },
1065         { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" },
1066         { 0x9000, "McAfeeNetShield" },
1067         { 0x9604, "CSA-NT_MON" },
1068         { 0xb6a8, "OceanIsleReachoutRemoteControl" },
1069         { 0xf11f, "SiteLockMetering" },
1070         { 0xf1ff, "SiteLock" },
1071         { 0xf503, "Microsoft SQL Server" },
1072         { 0xF905, "IBM TimeAndPlace" },
1073         { 0xfbfb, "TopCallIII FaxServer" },
1074         { 0xffff, "AnyService/Wildcard" },
1075         { 0, (char *)0 }
1076 };
1077
1078 static void
1079 init_ipxsaparray(void)
1080 {
1081         register int i;
1082         register struct hnamemem *table;
1083
1084         for (i = 0; ipxsap_db[i].s != NULL; i++) {
1085                 int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1);
1086                 table = &ipxsaptable[j];
1087                 while (table->name)
1088                         table = table->nxt;
1089                 table->name = ipxsap_db[i].s;
1090                 table->addr = htons(ipxsap_db[i].v);
1091                 table->nxt = newhnamemem();
1092         }
1093 }
1094
1095 /*
1096  * Initialize the address to name translation machinery.  We map all
1097  * non-local IP addresses to numeric addresses if fflag is true (i.e.,
1098  * to prevent blocking on the nameserver).  localnet is the IP address
1099  * of the local network.  mask is its subnet mask.
1100  */
1101 void
1102 init_addrtoname(u_int32_t localnet, u_int32_t mask)
1103 {
1104         if (fflag) {
1105                 f_localnet = localnet;
1106                 f_netmask = mask;
1107         }
1108         if (nflag)
1109                 /*
1110                  * Simplest way to suppress names.
1111                  */
1112                 return;
1113
1114         init_etherarray();
1115         init_servarray();
1116         init_eprotoarray();
1117         init_llcsaparray();
1118         init_protoidarray();
1119         init_ipxsaparray();
1120 }
1121
1122 const char *
1123 dnaddr_string(u_short dnaddr)
1124 {
1125         register struct hnamemem *tp;
1126
1127         for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != 0;
1128              tp = tp->nxt)
1129                 if (tp->addr == dnaddr)
1130                         return (tp->name);
1131
1132         tp->addr = dnaddr;
1133         tp->nxt = newhnamemem();
1134         if (nflag)
1135                 tp->name = dnnum_string(dnaddr);
1136         else
1137                 tp->name = dnname_string(dnaddr);
1138
1139         return(tp->name);
1140 }
1141
1142 /* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */
1143 struct hnamemem *
1144 newhnamemem(void)
1145 {
1146         register struct hnamemem *p;
1147         static struct hnamemem *ptr = NULL;
1148         static u_int num = 0;
1149
1150         if (num  <= 0) {
1151                 num = 64;
1152                 ptr = (struct hnamemem *)calloc(num, sizeof (*ptr));
1153                 if (ptr == NULL)
1154                         error("newhnamemem: calloc");
1155         }
1156         --num;
1157         p = ptr++;
1158         return (p);
1159 }
1160
1161 #ifdef INET6
1162 /* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */
1163 struct h6namemem *
1164 newh6namemem(void)
1165 {
1166         register struct h6namemem *p;
1167         static struct h6namemem *ptr = NULL;
1168         static u_int num = 0;
1169
1170         if (num  <= 0) {
1171                 num = 64;
1172                 ptr = (struct h6namemem *)calloc(num, sizeof (*ptr));
1173                 if (ptr == NULL)
1174                         error("newh6namemem: calloc");
1175         }
1176         --num;
1177         p = ptr++;
1178         return (p);
1179 }
1180 #endif /* INET6 */