contrib/tcpdump-3.8.3/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 1.96.2.6 2004/03/24 04:14:31 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  * NOTE: ap is *NOT* necessarily part of the packet data (not even if
 200  * this is being called with the "ipaddr_string()" macro), so you
 201  * *CANNOT* use the TCHECK{2}/TTEST{2} macros on it.  Furthermore,
 202  * even in cases where it *is* part of the packet data, the caller
 203  * would still have to check for a null return value, even if it's
 204  * just printing the return value with "%s" - not all versions of
 205  * printf print "(null)" with "%s" and a null pointer, some of them
 206  * don't check for a null pointer and crash in that case.
 207  *
 208  * The callers of this routine should, before handing this routine
 209  * a pointer to packet data, be sure that the data is present in
 210  * the packet buffer.  They should probably do those checks anyway,
 211  * as other data at that layer might not be IP addresses, and it
 212  * also needs to check whether they're present in the packet buffer.
 213  */
 214 const char *
 215 getname(const u_char *ap)
 216 {
 217         register struct hostent *hp;
 218         u_int32_t addr;
 219         static struct hnamemem *p;              /* static for longjmp() */
 220
 221         memcpy(&addr, ap, sizeof(addr));
 222         p = &hnametable[addr & (HASHNAMESIZE-1)];
 223         for (; p->nxt; p = p->nxt) {
 224                 if (p->addr == addr)
 225                         return (p->name);
 226         }
 227         p->addr = addr;
 228         p->nxt = newhnamemem();
 229
 230         /*
 231          * Print names unless:
 232          *      (1) -n was given.
 233          *      (2) Address is foreign and -f was given. (If -f was not
 234          *          given, f_netmask and f_localnet are 0 and the test
 235          *          evaluates to true)
 236          */
 237         if (!nflag &&
 238             (addr & f_netmask) == f_localnet) {
 239                 hp = gethostbyaddr((char *)&addr, 4, AF_INET);
 240                 if (hp) {
 241                         char *dotp;
 242
 243                         p->name = strdup(hp->h_name);
 244                         if (Nflag) {
 245                                 /* Remove domain qualifications */
 246                                 dotp = strchr(p->name, '.');
 247                                 if (dotp)
 248                                         *dotp = '\0';
 249                         }
 250                         return (p->name);
 251                 }
 252         }
 253         p->name = strdup(intoa(addr));
 254         return (p->name);
 255 }
 256
 257 #ifdef INET6
 258 /*
 259  * Return a name for the IP6 address pointed to by ap.  This address
 260  * is assumed to be in network byte order.
 261  */
 262 const char *
 263 getname6(const u_char *ap)
 264 {
 265         register struct hostent *hp;
 266         struct in6_addr addr;
 267         static struct h6namemem *p;             /* static for longjmp() */
 268         register const char *cp;
 269         char ntop_buf[INET6_ADDRSTRLEN];
 270
 271         memcpy(&addr, ap, sizeof(addr));
 272         p = &h6nametable[*(u_int16_t *)&addr.s6_addr[14] & (HASHNAMESIZE-1)];
 273         for (; p->nxt; p = p->nxt) {
 274                 if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
 275                         return (p->name);
 276         }
 277         p->addr = addr;
 278         p->nxt = newh6namemem();
 279
 280         /*
 281          * Do not print names if -n was given.
 282          */
 283         if (!nflag) {
 284                 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET6);
 285                 if (hp) {
 286                         char *dotp;
 287
 288                         p->name = strdup(hp->h_name);
 289                         if (Nflag) {
 290                                 /* Remove domain qualifications */
 291                                 dotp = strchr(p->name, '.');
 292                                 if (dotp)
 293                                         *dotp = '\0';
 294                         }
 295                         return (p->name);
 296                 }
 297         }
 298         cp = inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf));
 299         p->name = strdup(cp);
 300         return (p->name);
 301 }
 302 #endif /* INET6 */
 303
 304 static char hex[] = "0123456789abcdef";
 305
 306
 307 /* Find the hash node that corresponds the ether address 'ep' */
 308
 309 static inline struct enamemem *
 310 lookup_emem(const u_char *ep)
 311 {
 312         register u_int i, j, k;
 313         struct enamemem *tp;
 314
 315         k = (ep[0] << 8) | ep[1];
 316         j = (ep[2] << 8) | ep[3];
 317         i = (ep[4] << 8) | ep[5];
 318
 319         tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
 320         while (tp->e_nxt)
 321                 if (tp->e_addr0 == i &&
 322                     tp->e_addr1 == j &&
 323                     tp->e_addr2 == k)
 324                         return tp;
 325                 else
 326                         tp = tp->e_nxt;
 327         tp->e_addr0 = i;
 328         tp->e_addr1 = j;
 329         tp->e_addr2 = k;
 330         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 331         if (tp->e_nxt == NULL)
 332                 error("lookup_emem: calloc");
 333
 334         return tp;
 335 }
 336
 337 /*
 338  * Find the hash node that corresponds to the bytestring 'bs'
 339  * with length 'nlen'
 340  */
 341
 342 static inline struct enamemem *
 343 lookup_bytestring(register const u_char *bs, const unsigned int nlen)
 344 {
 345         struct enamemem *tp;
 346         register u_int i, j, k;
 347
 348         if (nlen >= 6) {
 349                 k = (bs[0] << 8) | bs[1];
 350                 j = (bs[2] << 8) | bs[3];
 351                 i = (bs[4] << 8) | bs[5];
 352         } else if (nlen >= 4) {
 353                 k = (bs[0] << 8) | bs[1];
 354                 j = (bs[2] << 8) | bs[3];
 355                 i = 0;
 356         } else
 357                 i = j = k = 0;
 358
 359         tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)];
 360         while (tp->e_nxt)
 361                 if (tp->e_addr0 == i &&
 362                     tp->e_addr1 == j &&
 363                     tp->e_addr2 == k &&
 364                     memcmp((const char *)bs, (const char *)(tp->e_bs), nlen) == 0)
 365                         return tp;
 366                 else
 367                         tp = tp->e_nxt;
 368
 369         tp->e_addr0 = i;
 370         tp->e_addr1 = j;
 371         tp->e_addr2 = k;
 372
 373         tp->e_bs = (u_char *) calloc(1, nlen + 1);
 374         memcpy(tp->e_bs, bs, nlen);
 375         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 376         if (tp->e_nxt == NULL)
 377                 error("lookup_bytestring: calloc");
 378
 379         return tp;
 380 }
 381
 382 /* Find the hash node that corresponds the NSAP 'nsap' */
 383
 384 static inline struct enamemem *
 385 lookup_nsap(register const u_char *nsap)
 386 {
 387         register u_int i, j, k;
 388         unsigned int nlen = *nsap;
 389         struct enamemem *tp;
 390         const u_char *ensap = nsap + nlen - 6;
 391
 392         if (nlen > 6) {
 393                 k = (ensap[0] << 8) | ensap[1];
 394                 j = (ensap[2] << 8) | ensap[3];
 395                 i = (ensap[4] << 8) | ensap[5];
 396         }
 397         else
 398                 i = j = k = 0;
 399
 400         tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
 401         while (tp->e_nxt)
 402                 if (tp->e_addr0 == i &&
 403                     tp->e_addr1 == j &&
 404                     tp->e_addr2 == k &&
 405                     tp->e_nsap[0] == nlen &&
 406                     memcmp((const char *)&(nsap[1]),
 407                         (char *)&(tp->e_nsap[1]), nlen) == 0)
 408                         return tp;
 409                 else
 410                         tp = tp->e_nxt;
 411         tp->e_addr0 = i;
 412         tp->e_addr1 = j;
 413         tp->e_addr2 = k;
 414         tp->e_nsap = (u_char *)malloc(nlen + 1);
 415         if (tp->e_nsap == NULL)
 416                 error("lookup_nsap: malloc");
 417         memcpy((char *)tp->e_nsap, (const char *)nsap, nlen + 1);
 418         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 419         if (tp->e_nxt == NULL)
 420                 error("lookup_nsap: calloc");
 421
 422         return tp;
 423 }
 424
 425 /* Find the hash node that corresponds the protoid 'pi'. */
 426
 427 static inline struct protoidmem *
 428 lookup_protoid(const u_char *pi)
 429 {
 430         register u_int i, j;
 431         struct protoidmem *tp;
 432
 433         /* 5 octets won't be aligned */
 434         i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
 435         j =   (pi[3] << 8) + pi[4];
 436         /* XXX should be endian-insensitive, but do big-endian testing  XXX */
 437
 438         tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
 439         while (tp->p_nxt)
 440                 if (tp->p_oui == i && tp->p_proto == j)
 441                         return tp;
 442                 else
 443                         tp = tp->p_nxt;
 444         tp->p_oui = i;
 445         tp->p_proto = j;
 446         tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
 447         if (tp->p_nxt == NULL)
 448                 error("lookup_protoid: calloc");
 449
 450         return tp;
 451 }
 452
 453 const char *
 454 etheraddr_string(register const u_char *ep)
 455 {
 456         register u_int i;
 457         register char *cp;
 458         register struct enamemem *tp;
 459         char buf[sizeof("00:00:00:00:00:00")];
 460
 461         tp = lookup_emem(ep);
 462         if (tp->e_name)
 463                 return (tp->e_name);
 464 #ifdef USE_ETHER_NTOHOST
 465         if (!nflag) {
 466                 char buf2[128];
 467                 if (ether_ntohost(buf2, (const struct ether_addr *)ep) == 0) {
 468                         tp->e_name = strdup(buf2);
 469                         return (tp->e_name);
 470                 }
 471         }
 472 #endif
 473         cp = buf;
 474         *cp++ = hex[*ep >> 4 ];
 475         *cp++ = hex[*ep++ & 0xf];
 476         for (i = 5; (int)--i >= 0;) {
 477                 *cp++ = ':';
 478                 *cp++ = hex[*ep >> 4 ];
 479                 *cp++ = hex[*ep++ & 0xf];
 480         }
 481         *cp = '\0';
 482         tp->e_name = strdup(buf);
 483         return (tp->e_name);
 484 }
 485
 486 const char *
 487 linkaddr_string(const u_char *ep, const unsigned int len)
 488 {
 489         register u_int i, j;
 490         register char *cp;
 491         register struct enamemem *tp;
 492
 493         if (len == 6)   /* XXX not totally correct... */
 494                 return etheraddr_string(ep);
 495
 496         tp = lookup_bytestring(ep, len);
 497         if (tp->e_name)
 498                 return (tp->e_name);
 499
 500         tp->e_name = cp = (char *)malloc(len*3);
 501         if (tp->e_name == NULL)
 502                 error("linkaddr_string: malloc");
 503         if ((j = *ep >> 4) != 0)
 504                 *cp++ = hex[j];
 505         *cp++ = hex[*ep++ & 0xf];
 506         for (i = len-1; i > 0 ; --i) {
 507                 *cp++ = ':';
 508                 if ((j = *ep >> 4) != 0)
 509                         *cp++ = hex[j];
 510                 *cp++ = hex[*ep++ & 0xf];
 511         }
 512         *cp = '\0';
 513         return (tp->e_name);
 514 }
 515
 516 const char *
 517 etherproto_string(u_short port)
 518 {
 519         register char *cp;
 520         register struct hnamemem *tp;
 521         register u_int32_t i = port;
 522         char buf[sizeof("0000")];
 523
 524         for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 525                 if (tp->addr == i)
 526                         return (tp->name);
 527
 528         tp->addr = i;
 529         tp->nxt = newhnamemem();
 530
 531         cp = buf;
 532         NTOHS(port);
 533         *cp++ = hex[port >> 12 & 0xf];
 534         *cp++ = hex[port >> 8 & 0xf];
 535         *cp++ = hex[port >> 4 & 0xf];
 536         *cp++ = hex[port & 0xf];
 537         *cp++ = '\0';
 538         tp->name = strdup(buf);
 539         return (tp->name);
 540 }
 541
 542 const char *
 543 protoid_string(register const u_char *pi)
 544 {
 545         register u_int i, j;
 546         register char *cp;
 547         register struct protoidmem *tp;
 548         char buf[sizeof("00:00:00:00:00")];
 549
 550         tp = lookup_protoid(pi);
 551         if (tp->p_name)
 552                 return tp->p_name;
 553
 554         cp = buf;
 555         if ((j = *pi >> 4) != 0)
 556                 *cp++ = hex[j];
 557         *cp++ = hex[*pi++ & 0xf];
 558         for (i = 4; (int)--i >= 0;) {
 559                 *cp++ = ':';
 560                 if ((j = *pi >> 4) != 0)
 561                         *cp++ = hex[j];
 562                 *cp++ = hex[*pi++ & 0xf];
 563         }
 564         *cp = '\0';
 565         tp->p_name = strdup(buf);
 566         return (tp->p_name);
 567 }
 568
 569 const char *
 570 llcsap_string(u_char sap)
 571 {
 572         register struct hnamemem *tp;
 573         register u_int32_t i = sap;
 574         char buf[sizeof("sap 00")];
 575
 576         for (tp = &llcsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 577                 if (tp->addr == i)
 578                         return (tp->name);
 579
 580         tp->addr = i;
 581         tp->nxt = newhnamemem();
 582
 583         snprintf(buf, sizeof(buf), "sap %02x", sap & 0xff);
 584         tp->name = strdup(buf);
 585         return (tp->name);
 586 }
 587
 588 const char *
 589 isonsap_string(const u_char *nsap)
 590 {
 591         register u_int i, nlen = nsap[0];
 592         register char *cp;
 593         register struct enamemem *tp;
 594
 595         tp = lookup_nsap(nsap);
 596         if (tp->e_name)
 597                 return tp->e_name;
 598
 599         tp->e_name = cp = (char *)malloc(nlen * 2 + 2);
 600         if (cp == NULL)
 601                 error("isonsap_string: malloc");
 602
 603         nsap++;
 604         *cp++ = '/';
 605         for (i = nlen; (int)--i >= 0;) {
 606                 *cp++ = hex[*nsap >> 4];
 607                 *cp++ = hex[*nsap++ & 0xf];
 608         }
 609         *cp = '\0';
 610         return (tp->e_name);
 611 }
 612
 613 const char *
 614 tcpport_string(u_short port)
 615 {
 616         register struct hnamemem *tp;
 617         register u_int32_t i = port;
 618         char buf[sizeof("00000")];
 619
 620         for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 621                 if (tp->addr == i)
 622                         return (tp->name);
 623
 624         tp->addr = i;
 625         tp->nxt = newhnamemem();
 626
 627         (void)snprintf(buf, sizeof(buf), "%u", i);
 628         tp->name = strdup(buf);
 629         return (tp->name);
 630 }
 631
 632 const char *
 633 udpport_string(register u_short port)
 634 {
 635         register struct hnamemem *tp;
 636         register u_int32_t i = port;
 637         char buf[sizeof("00000")];
 638
 639         for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 640                 if (tp->addr == i)
 641                         return (tp->name);
 642
 643         tp->addr = i;
 644         tp->nxt = newhnamemem();
 645
 646         (void)snprintf(buf, sizeof(buf), "%u", i);
 647         tp->name = strdup(buf);
 648         return (tp->name);
 649 }
 650
 651 const char *
 652 ipxsap_string(u_short port)
 653 {
 654         register char *cp;
 655         register struct hnamemem *tp;
 656         register u_int32_t i = port;
 657         char buf[sizeof("0000")];
 658
 659         for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 660                 if (tp->addr == i)
 661                         return (tp->name);
 662
 663         tp->addr = i;
 664         tp->nxt = newhnamemem();
 665
 666         cp = buf;
 667         NTOHS(port);
 668         *cp++ = hex[port >> 12 & 0xf];
 669         *cp++ = hex[port >> 8 & 0xf];
 670         *cp++ = hex[port >> 4 & 0xf];
 671         *cp++ = hex[port & 0xf];
 672         *cp++ = '\0';
 673         tp->name = strdup(buf);
 674         return (tp->name);
 675 }
 676
 677 static void
 678 init_servarray(void)
 679 {
 680         struct servent *sv;
 681         register struct hnamemem *table;
 682         register int i;
 683         char buf[sizeof("0000000000")];
 684
 685         while ((sv = getservent()) != NULL) {
 686                 int port = ntohs(sv->s_port);
 687                 i = port & (HASHNAMESIZE-1);
 688                 if (strcmp(sv->s_proto, "tcp") == 0)
 689                         table = &tporttable[i];
 690                 else if (strcmp(sv->s_proto, "udp") == 0)
 691                         table = &uporttable[i];
 692                 else
 693                         continue;
 694
 695                 while (table->name)
 696                         table = table->nxt;
 697                 if (nflag) {
 698                         (void)snprintf(buf, sizeof(buf), "%d", port);
 699                         table->name = strdup(buf);
 700                 } else
 701                         table->name = strdup(sv->s_name);
 702                 table->addr = port;
 703                 table->nxt = newhnamemem();
 704         }
 705         endservent();
 706 }
 707
 708 /*XXX from libbpfc.a */
 709 #ifndef WIN32
 710 extern struct eproto {
 711 #else
 712 __declspec( dllimport) struct eproto {
 713 #endif
 714         char *s;
 715         u_short p;
 716 } eproto_db[];
 717
 718 static void
 719 init_eprotoarray(void)
 720 {
 721         register int i;
 722         register struct hnamemem *table;
 723
 724         for (i = 0; eproto_db[i].s; i++) {
 725                 int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
 726                 table = &eprototable[j];
 727                 while (table->name)
 728                         table = table->nxt;
 729                 table->name = eproto_db[i].s;
 730                 table->addr = htons(eproto_db[i].p);
 731                 table->nxt = newhnamemem();
 732         }
 733 }
 734
 735 static struct protoidlist {
 736         const u_char protoid[5];
 737         const char *name;
 738 } protoidlist[] = {
 739         {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
 740         {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
 741         {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
 742         {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
 743         {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
 744         {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 745 };
 746
 747 /*
 748  * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
 749  * types.
 750  */
 751 static void
 752 init_protoidarray(void)
 753 {
 754         register int i;
 755         register struct protoidmem *tp;
 756         struct protoidlist *pl;
 757         u_char protoid[5];
 758
 759         protoid[0] = 0;
 760         protoid[1] = 0;
 761         protoid[2] = 0;
 762         for (i = 0; eproto_db[i].s; i++) {
 763                 u_short etype = htons(eproto_db[i].p);
 764
 765                 memcpy((char *)&protoid[3], (char *)&etype, 2);
 766                 tp = lookup_protoid(protoid);
 767                 tp->p_name = strdup(eproto_db[i].s);
 768         }
 769         /* Hardwire some SNAP proto ID names */
 770         for (pl = protoidlist; pl->name != NULL; ++pl) {
 771                 tp = lookup_protoid(pl->protoid);
 772                 /* Don't override existing name */
 773                 if (tp->p_name != NULL)
 774                         continue;
 775
 776                 tp->p_name = pl->name;
 777         }
 778 }
 779
 780 static struct etherlist {
 781         const u_char addr[6];
 782         const char *name;
 783 } etherlist[] = {
 784         {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
 785         {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 786 };
 787
 788 /*
 789  * Initialize the ethers hash table.  We take two different approaches
 790  * depending on whether or not the system provides the ethers name
 791  * service.  If it does, we just wire in a few names at startup,
 792  * and etheraddr_string() fills in the table on demand.  If it doesn't,
 793  * then we suck in the entire /etc/ethers file at startup.  The idea
 794  * is that parsing the local file will be fast, but spinning through
 795  * all the ethers entries via NIS & next_etherent might be very slow.
 796  *
 797  * XXX pcap_next_etherent doesn't belong in the pcap interface, but
 798  * since the pcap module already does name-to-address translation,
 799  * it's already does most of the work for the ethernet address-to-name
 800  * translation, so we just pcap_next_etherent as a convenience.
 801  */
 802 static void
 803 init_etherarray(void)
 804 {
 805         register struct etherlist *el;
 806         register struct enamemem *tp;
 807 #ifdef USE_ETHER_NTOHOST
 808         char name[256];
 809 #else
 810         register struct pcap_etherent *ep;
 811         register FILE *fp;
 812
 813         /* Suck in entire ethers file */
 814         fp = fopen(PCAP_ETHERS_FILE, "r");
 815         if (fp != NULL) {
 816                 while ((ep = pcap_next_etherent(fp)) != NULL) {
 817                         tp = lookup_emem(ep->addr);
 818                         tp->e_name = strdup(ep->name);
 819                 }
 820                 (void)fclose(fp);
 821         }
 822 #endif
 823
 824         /* Hardwire some ethernet names */
 825         for (el = etherlist; el->name != NULL; ++el) {
 826                 tp = lookup_emem(el->addr);
 827                 /* Don't override existing name */
 828                 if (tp->e_name != NULL)
 829                         continue;
 830
 831 #ifdef USE_ETHER_NTOHOST
 832                 /* Use yp/nis version of name if available */
 833                 if (ether_ntohost(name, (const struct ether_addr *)el->addr) == 0) {
 834                         tp->e_name = strdup(name);
 835                         continue;
 836                 }
 837 #endif
 838                 tp->e_name = el->name;
 839         }
 840 }
 841
 842 static struct tok llcsap_db[] = {
 843         { LLCSAP_NULL,          "null" },
 844         { LLCSAP_8021B_I,       "802.1b-gsap" },
 845         { LLCSAP_8021B_G,       "802.1b-isap" },
 846         { LLCSAP_IP,            "ip-sap" },
 847         { LLCSAP_PROWAYNM,      "proway-nm" },
 848         { LLCSAP_8021D,         "802.1d" },
 849         { LLCSAP_RS511,         "eia-rs511" },
 850         { LLCSAP_ISO8208,       "x.25/llc2" },
 851         { LLCSAP_PROWAY,        "proway" },
 852         { LLCSAP_SNAP,          "snap" },
 853         { LLCSAP_IPX,           "IPX" },
 854         { LLCSAP_NETBEUI,       "netbeui" },
 855         { LLCSAP_ISONS,         "iso-clns" },
 856         { LLCSAP_GLOBAL,        "global" },
 857         { 0,                    NULL }
 858 };
 859
 860 static void
 861 init_llcsaparray(void)
 862 {
 863         register int i;
 864         register struct hnamemem *table;
 865
 866         for (i = 0; llcsap_db[i].s != NULL; i++) {
 867                 table = &llcsaptable[llcsap_db[i].v];
 868                 while (table->name)
 869                         table = table->nxt;
 870                 table->name = llcsap_db[i].s;
 871                 table->addr = llcsap_db[i].v;
 872                 table->nxt = newhnamemem();
 873         }
 874 }
 875
 876 static struct tok ipxsap_db[] = {
 877         { 0x0000, "Unknown" },
 878         { 0x0001, "User" },
 879         { 0x0002, "User Group" },
 880         { 0x0003, "PrintQueue" },
 881         { 0x0004, "FileServer" },
 882         { 0x0005, "JobServer" },
 883         { 0x0006, "Gateway" },
 884         { 0x0007, "PrintServer" },
 885         { 0x0008, "ArchiveQueue" },
 886         { 0x0009, "ArchiveServer" },
 887         { 0x000a, "JobQueue" },
 888         { 0x000b, "Administration" },
 889         { 0x000F, "Novell TI-RPC" },
 890         { 0x0017, "Diagnostics" },
 891         { 0x0020, "NetBIOS" },
 892         { 0x0021, "NAS SNA Gateway" },
 893         { 0x0023, "NACS AsyncGateway" },
 894         { 0x0024, "RemoteBridge/RoutingService" },
 895         { 0x0026, "BridgeServer" },
 896         { 0x0027, "TCP/IP Gateway" },
 897         { 0x0028, "Point-to-point X.25 BridgeServer" },
 898         { 0x0029, "3270 Gateway" },
 899         { 0x002a, "CHI Corp" },
 900         { 0x002c, "PC Chalkboard" },
 901         { 0x002d, "TimeSynchServer" },
 902         { 0x002e, "ARCserve5.0/PalindromeBackup" },
 903         { 0x0045, "DI3270 Gateway" },
 904         { 0x0047, "AdvertisingPrintServer" },
 905         { 0x004a, "NetBlazerModems" },
 906         { 0x004b, "BtrieveVAP" },
 907         { 0x004c, "NetwareSQL" },
 908         { 0x004d, "XtreeNetwork" },
 909         { 0x0050, "BtrieveVAP4.11" },
 910         { 0x0052, "QuickLink" },
 911         { 0x0053, "PrintQueueUser" },
 912         { 0x0058, "Multipoint X.25 Router" },
 913         { 0x0060, "STLB/NLM" },
 914         { 0x0064, "ARCserve" },
 915         { 0x0066, "ARCserve3.0" },
 916         { 0x0072, "WAN CopyUtility" },
 917         { 0x007a, "TES-NetwareVMS" },
 918         { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" },
 919         { 0x0095, "DDA OBGYN" },
 920         { 0x0098, "NetwareAccessServer" },
 921         { 0x009a, "Netware for VMS II/NamedPipeServer" },
 922         { 0x009b, "NetwareAccessServer" },
 923         { 0x009e, "PortableNetwareServer/SunLinkNVT" },
 924         { 0x00a1, "PowerchuteAPC UPS" },
 925         { 0x00aa, "LAWserve" },
 926         { 0x00ac, "CompaqIDA StatusMonitor" },
 927         { 0x0100, "PIPE STAIL" },
 928         { 0x0102, "LAN ProtectBindery" },
 929         { 0x0103, "OracleDataBaseServer" },
 930         { 0x0107, "Netware386/RSPX RemoteConsole" },
 931         { 0x010f, "NovellSNA Gateway" },
 932         { 0x0111, "TestServer" },
 933         { 0x0112, "HP PrintServer" },
 934         { 0x0114, "CSA MUX" },
 935         { 0x0115, "CSA LCA" },
 936         { 0x0116, "CSA CM" },
 937         { 0x0117, "CSA SMA" },
 938         { 0x0118, "CSA DBA" },
 939         { 0x0119, "CSA NMA" },
 940         { 0x011a, "CSA SSA" },
 941         { 0x011b, "CSA STATUS" },
 942         { 0x011e, "CSA APPC" },
 943         { 0x0126, "SNA TEST SSA Profile" },
 944         { 0x012a, "CSA TRACE" },
 945         { 0x012b, "NetwareSAA" },
 946         { 0x012e, "IKARUS VirusScan" },
 947         { 0x0130, "CommunicationsExecutive" },
 948         { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" },
 949         { 0x0135, "NetwareNamingServicesProfile" },
 950         { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" },
 951         { 0x0141, "LAN SpoolServer" },
 952         { 0x0152, "IRMALAN Gateway" },
 953         { 0x0154, "NamedPipeServer" },
 954         { 0x0166, "NetWareManagement" },
 955         { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" },
 956         { 0x0173, "Compaq" },
 957         { 0x0174, "Compaq SNMP Agent" },
 958         { 0x0175, "Compaq" },
 959         { 0x0180, "XTreeServer/XTreeTools" },
 960         { 0x018A, "NASI ServicesBroadcastServer" },
 961         { 0x01b0, "GARP Gateway" },
 962         { 0x01b1, "Binfview" },
 963         { 0x01bf, "IntelLanDeskManager" },
 964         { 0x01ca, "AXTEC" },
 965         { 0x01cb, "ShivaNetModem/E" },
 966         { 0x01cc, "ShivaLanRover/E" },
 967         { 0x01cd, "ShivaLanRover/T" },
 968         { 0x01ce, "ShivaUniversal" },
 969         { 0x01d8, "CastelleFAXPressServer" },
 970         { 0x01da, "CastelleLANPressPrintServer" },
 971         { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" },
 972         { 0x01f0, "LEGATO" },
 973         { 0x01f5, "LEGATO" },
 974         { 0x0233, "NMS Agent/NetwareManagementAgent" },
 975         { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" },
 976         { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" },
 977         { 0x023a, "LANtern" },
 978         { 0x023c, "MAVERICK" },
 979         { 0x023f, "NovellSMDR" },
 980         { 0x024e, "NetwareConnect" },
 981         { 0x024f, "NASI ServerBroadcast Cisco" },
 982         { 0x026a, "NMS ServiceConsole" },
 983         { 0x026b, "TimeSynchronizationServer Netware 4.x" },
 984         { 0x0278, "DirectoryServer Netware 4.x" },
 985         { 0x027b, "NetwareManagementAgent" },
 986         { 0x0280, "Novell File and Printer Sharing Service for PC" },
 987         { 0x0304, "NovellSAA Gateway" },
 988         { 0x0308, "COM/VERMED" },
 989         { 0x030a, "GalacticommWorldgroupServer" },
 990         { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" },
 991         { 0x0320, "AttachmateGateway" },
 992         { 0x0327, "MicrosoftDiagnostiocs" },
 993         { 0x0328, "WATCOM SQL Server" },
 994         { 0x0335, "MultiTechSystems MultisynchCommServer" },
 995         { 0x0343, "Xylogics RemoteAccessServer/LANModem" },
 996         { 0x0355, "ArcadaBackupExec" },
 997         { 0x0358, "MSLCD1" },
 998         { 0x0361, "NETINELO" },
 999         { 0x037e, "Powerchute UPS Monitoring" },
1000         { 0x037f, "ViruSafeNotify" },
1001         { 0x0386, "HP Bridge" },
1002         { 0x0387, "HP Hub" },
1003         { 0x0394, "NetWare SAA Gateway" },
1004         { 0x039b, "LotusNotes" },
1005         { 0x03b7, "CertusAntiVirus" },
1006         { 0x03c4, "ARCserve4.0" },
1007         { 0x03c7, "LANspool3.5" },
1008         { 0x03d7, "LexmarkPrinterServer" },
1009         { 0x03d8, "LexmarkXLE PrinterServer" },
1010         { 0x03dd, "BanyanENS NetwareClient" },
1011         { 0x03de, "GuptaSequelBaseServer/NetWareSQL" },
1012         { 0x03e1, "UnivelUnixware" },
1013         { 0x03e4, "UnivelUnixware" },
1014         { 0x03fc, "IntelNetport" },
1015         { 0x03fd, "PrintServerQueue" },
1016         { 0x040A, "ipnServer" },
1017         { 0x040D, "LVERRMAN" },
1018         { 0x040E, "LVLIC" },
1019         { 0x0414, "NET Silicon (DPI)/Kyocera" },
1020         { 0x0429, "SiteLockVirus" },
1021         { 0x0432, "UFHELPR???" },
1022         { 0x0433, "Synoptics281xAdvancedSNMPAgent" },
1023         { 0x0444, "MicrosoftNT SNA Server" },
1024         { 0x0448, "Oracle" },
1025         { 0x044c, "ARCserve5.01" },
1026         { 0x0457, "CanonGP55" },
1027         { 0x045a, "QMS Printers" },
1028         { 0x045b, "DellSCSI Array" },
1029         { 0x0491, "NetBlazerModems" },
1030         { 0x04ac, "OnTimeScheduler" },
1031         { 0x04b0, "CD-Net" },
1032         { 0x0513, "EmulexNQA" },
1033         { 0x0520, "SiteLockChecks" },
1034         { 0x0529, "SiteLockChecks" },
1035         { 0x052d, "CitrixOS2 AppServer" },
1036         { 0x0535, "Tektronix" },
1037         { 0x0536, "Milan" },
1038         { 0x055d, "Attachmate SNA gateway" },
1039         { 0x056b, "IBM8235 ModemServer" },
1040         { 0x056c, "ShivaLanRover/E PLUS" },
1041         { 0x056d, "ShivaLanRover/T PLUS" },
1042         { 0x0580, "McAfeeNetShield" },
1043         { 0x05B8, "NLM to workstation communication (Revelation Software)" },
1044         { 0x05BA, "CompatibleSystemsRouters" },
1045         { 0x05BE, "CheyenneHierarchicalStorageManager" },
1046         { 0x0606, "JCWatermarkImaging" },
1047         { 0x060c, "AXISNetworkPrinter" },
1048         { 0x0610, "AdaptecSCSIManagement" },
1049         { 0x0621, "IBM AntiVirus" },
1050         { 0x0640, "Windows95 RemoteRegistryService" },
1051         { 0x064e, "MicrosoftIIS" },
1052         { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1053         { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1054         { 0x076C, "Xerox" },
1055         { 0x079b, "ShivaLanRover/E 115" },
1056         { 0x079c, "ShivaLanRover/T 115" },
1057         { 0x07B4, "CubixWorldDesk" },
1058         { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" },
1059         { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" },
1060         { 0x0810, "ELAN License Server Demo" },
1061         { 0x0824, "ShivaLanRoverAccessSwitch/E" },
1062         { 0x086a, "ISSC Collector" },
1063         { 0x087f, "ISSC DAS AgentAIX" },
1064         { 0x0880, "Intel Netport PRO" },
1065         { 0x0881, "Intel Netport PRO" },
1066         { 0x0b29, "SiteLock" },
1067         { 0x0c29, "SiteLockApplications" },
1068         { 0x0c2c, "LicensingServer" },
1069         { 0x2101, "PerformanceTechnologyInstantInternet" },
1070         { 0x2380, "LAI SiteLock" },
1071         { 0x238c, "MeetingMaker" },
1072         { 0x4808, "SiteLockServer/SiteLockMetering" },
1073         { 0x5555, "SiteLockUser" },
1074         { 0x6312, "Tapeware" },
1075         { 0x6f00, "RabbitGateway" },
1076         { 0x7703, "MODEM" },
1077         { 0x8002, "NetPortPrinters" },
1078         { 0x8008, "WordPerfectNetworkVersion" },
1079         { 0x85BE, "Cisco EIGRP" },
1080         { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" },
1081         { 0x9000, "McAfeeNetShield" },
1082         { 0x9604, "CSA-NT_MON" },
1083         { 0xb6a8, "OceanIsleReachoutRemoteControl" },
1084         { 0xf11f, "SiteLockMetering" },
1085         { 0xf1ff, "SiteLock" },
1086         { 0xf503, "Microsoft SQL Server" },
1087         { 0xF905, "IBM TimeAndPlace" },
1088         { 0xfbfb, "TopCallIII FaxServer" },
1089         { 0xffff, "AnyService/Wildcard" },
1090         { 0, (char *)0 }
1091 };
1092
1093 static void
1094 init_ipxsaparray(void)
1095 {
1096         register int i;
1097         register struct hnamemem *table;
1098
1099         for (i = 0; ipxsap_db[i].s != NULL; i++) {
1100                 int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1);
1101                 table = &ipxsaptable[j];
1102                 while (table->name)
1103                         table = table->nxt;
1104                 table->name = ipxsap_db[i].s;
1105                 table->addr = htons(ipxsap_db[i].v);
1106                 table->nxt = newhnamemem();
1107         }
1108 }
1109
1110 /*
1111  * Initialize the address to name translation machinery.  We map all
1112  * non-local IP addresses to numeric addresses if fflag is true (i.e.,
1113  * to prevent blocking on the nameserver).  localnet is the IP address
1114  * of the local network.  mask is its subnet mask.
1115  */
1116 void
1117 init_addrtoname(u_int32_t localnet, u_int32_t mask)
1118 {
1119         if (fflag) {
1120                 f_localnet = localnet;
1121                 f_netmask = mask;
1122         }
1123         if (nflag)
1124                 /*
1125                  * Simplest way to suppress names.
1126                  */
1127                 return;
1128
1129         init_etherarray();
1130         init_servarray();
1131         init_eprotoarray();
1132         init_llcsaparray();
1133         init_protoidarray();
1134         init_ipxsaparray();
1135 }
1136
1137 const char *
1138 dnaddr_string(u_short dnaddr)
1139 {
1140         register struct hnamemem *tp;
1141
1142         for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != 0;
1143              tp = tp->nxt)
1144                 if (tp->addr == dnaddr)
1145                         return (tp->name);
1146
1147         tp->addr = dnaddr;
1148         tp->nxt = newhnamemem();
1149         if (nflag)
1150                 tp->name = dnnum_string(dnaddr);
1151         else
1152                 tp->name = dnname_string(dnaddr);
1153
1154         return(tp->name);
1155 }
1156
1157 /* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */
1158 struct hnamemem *
1159 newhnamemem(void)
1160 {
1161         register struct hnamemem *p;
1162         static struct hnamemem *ptr = NULL;
1163         static u_int num = 0;
1164
1165         if (num  <= 0) {
1166                 num = 64;
1167                 ptr = (struct hnamemem *)calloc(num, sizeof (*ptr));
1168                 if (ptr == NULL)
1169                         error("newhnamemem: calloc");
1170         }
1171         --num;
1172         p = ptr++;
1173         return (p);
1174 }
1175
1176 #ifdef INET6
1177 /* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */
1178 struct h6namemem *
1179 newh6namemem(void)
1180 {
1181         register struct h6namemem *p;
1182         static struct h6namemem *ptr = NULL;
1183         static u_int num = 0;
1184
1185         if (num  <= 0) {
1186                 num = 64;
1187                 ptr = (struct h6namemem *)calloc(num, sizeof (*ptr));
1188                 if (ptr == NULL)
1189                         error("newh6namemem: calloc");
1190         }
1191         --num;
1192         p = ptr++;
1193         return (p);
1194 }
1195 #endif /* INET6 */