contrib/tcpdump-3.9/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 1.108.2.9 2007/09/14 00:26:18 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 NETINET_ETHER_H_DECLARES_ETHER_NTOHOST
  43 #include <netinet/ether.h>
  44 #endif /* NETINET_ETHER_H_DECLARES_ETHER_NTOHOST */
  45
  46 #if !defined(HAVE_DECL_ETHER_NTOHOST) || !HAVE_DECL_ETHER_NTOHOST
  47 #ifndef HAVE_STRUCT_ETHER_ADDR
  48 struct ether_addr {
  49         unsigned char ether_addr_octet[6];
  50 };
  51 #endif
  52 extern int ether_ntohost(char *, const struct ether_addr *);
  53 #endif
  54
  55 #endif /* USE_ETHER_NTOHOST */
  56
  57 #include <pcap.h>
  58 #include <pcap-namedb.h>
  59 #include <signal.h>
  60 #include <stdio.h>
  61 #include <string.h>
  62 #include <stdlib.h>
  63
  64 #include "interface.h"
  65 #include "addrtoname.h"
  66 #include "llc.h"
  67 #include "setsignal.h"
  68 #include "extract.h"
  69 #include "oui.h"
  70
  71 #ifndef ETHER_ADDR_LEN
  72 #define ETHER_ADDR_LEN  6
  73 #endif
  74
  75 /*
  76  * hash tables for whatever-to-name translations
  77  *
  78  * XXX there has to be error checks against strdup(3) failure
  79  */
  80
  81 #define HASHNAMESIZE 4096
  82 #define BUFSIZE 128
  83
  84 struct hnamemem {
  85         u_int32_t addr;
  86         const char *name;
  87         struct hnamemem *nxt;
  88 };
  89
  90 struct hnamemem hnametable[HASHNAMESIZE];
  91 struct hnamemem tporttable[HASHNAMESIZE];
  92 struct hnamemem uporttable[HASHNAMESIZE];
  93 struct hnamemem eprototable[HASHNAMESIZE];
  94 struct hnamemem dnaddrtable[HASHNAMESIZE];
  95 struct hnamemem ipxsaptable[HASHNAMESIZE];
  96
  97 #if defined(INET6) && defined(WIN32)
  98 /*
  99  * fake gethostbyaddr for Win2k/XP
 100  * gethostbyaddr() returns incorrect value when AF_INET6 is passed
 101  * to 3rd argument.
 102  *
 103  * h_name in struct hostent is only valid.
 104  */
 105 static struct hostent *
 106 win32_gethostbyaddr(const char *addr, int len, int type)
 107 {
 108         static struct hostent host;
 109         static char hostbuf[NI_MAXHOST];
 110         char hname[NI_MAXHOST];
 111         struct sockaddr_in6 addr6;
 112
 113         host.h_name = hostbuf;
 114         switch (type) {
 115         case AF_INET:
 116                 return gethostbyaddr(addr, len, type);
 117                 break;
 118         case AF_INET6:
 119                 memset(&addr6, 0, sizeof(addr6));
 120                 addr6.sin6_family = AF_INET6;
 121                 memcpy(&addr6.sin6_addr, addr, len);
 122                 if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6),
 123                     hname, sizeof(hname), NULL, 0, 0)) {
 124                         return NULL;
 125                 } else {
 126                         strcpy(host.h_name, hname);
 127                         return &host;
 128                 }
 129                 break;
 130         default:
 131                 return NULL;
 132         }
 133 }
 134 #define gethostbyaddr win32_gethostbyaddr
 135 #endif /* INET6 & WIN32 */
 136
 137 #ifdef INET6
 138 struct h6namemem {
 139         struct in6_addr addr;
 140         char *name;
 141         struct h6namemem *nxt;
 142 };
 143
 144 struct h6namemem h6nametable[HASHNAMESIZE];
 145 #endif /* INET6 */
 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 #define e_bs e_nsap                     /* for bytestringtable */
 154         struct enamemem *e_nxt;
 155 };
 156
 157 struct enamemem enametable[HASHNAMESIZE];
 158 struct enamemem nsaptable[HASHNAMESIZE];
 159 struct enamemem bytestringtable[HASHNAMESIZE];
 160
 161 struct protoidmem {
 162         u_int32_t p_oui;
 163         u_short p_proto;
 164         const char *p_name;
 165         struct protoidmem *p_nxt;
 166 };
 167
 168 struct protoidmem protoidtable[HASHNAMESIZE];
 169
 170 /*
 171  * A faster replacement for inet_ntoa().
 172  */
 173 const char *
 174 intoa(u_int32_t addr)
 175 {
 176         register char *cp;
 177         register u_int byte;
 178         register int n;
 179         static char buf[sizeof(".xxx.xxx.xxx.xxx")];
 180
 181         NTOHL(addr);
 182         cp = buf + sizeof(buf);
 183         *--cp = '\0';
 184
 185         n = 4;
 186         do {
 187                 byte = addr & 0xff;
 188                 *--cp = byte % 10 + '0';
 189                 byte /= 10;
 190                 if (byte > 0) {
 191                         *--cp = byte % 10 + '0';
 192                         byte /= 10;
 193                         if (byte > 0)
 194                                 *--cp = byte + '0';
 195                 }
 196                 *--cp = '.';
 197                 addr >>= 8;
 198         } while (--n > 0);
 199
 200         return cp + 1;
 201 }
 202
 203 static u_int32_t f_netmask;
 204 static u_int32_t f_localnet;
 205
 206 /*
 207  * Return a name for the IP address pointed to by ap.  This address
 208  * is assumed to be in network byte order.
 209  *
 210  * NOTE: ap is *NOT* necessarily part of the packet data (not even if
 211  * this is being called with the "ipaddr_string()" macro), so you
 212  * *CANNOT* use the TCHECK{2}/TTEST{2} macros on it.  Furthermore,
 213  * even in cases where it *is* part of the packet data, the caller
 214  * would still have to check for a null return value, even if it's
 215  * just printing the return value with "%s" - not all versions of
 216  * printf print "(null)" with "%s" and a null pointer, some of them
 217  * don't check for a null pointer and crash in that case.
 218  *
 219  * The callers of this routine should, before handing this routine
 220  * a pointer to packet data, be sure that the data is present in
 221  * the packet buffer.  They should probably do those checks anyway,
 222  * as other data at that layer might not be IP addresses, and it
 223  * also needs to check whether they're present in the packet buffer.
 224  */
 225 const char *
 226 getname(const u_char *ap)
 227 {
 228         register struct hostent *hp;
 229         u_int32_t addr;
 230         static struct hnamemem *p;              /* static for longjmp() */
 231
 232         memcpy(&addr, ap, sizeof(addr));
 233         p = &hnametable[addr & (HASHNAMESIZE-1)];
 234         for (; p->nxt; p = p->nxt) {
 235                 if (p->addr == addr)
 236                         return (p->name);
 237         }
 238         p->addr = addr;
 239         p->nxt = newhnamemem();
 240
 241         /*
 242          * Print names unless:
 243          *      (1) -n was given.
 244          *      (2) Address is foreign and -f was given. (If -f was not
 245          *          given, f_netmask and f_localnet are 0 and the test
 246          *          evaluates to true)
 247          */
 248         if (!nflag &&
 249             (addr & f_netmask) == f_localnet) {
 250                 hp = gethostbyaddr((char *)&addr, 4, AF_INET);
 251                 if (hp) {
 252                         char *dotp;
 253
 254                         p->name = strdup(hp->h_name);
 255                         if (Nflag) {
 256                                 /* Remove domain qualifications */
 257                                 dotp = strchr(p->name, '.');
 258                                 if (dotp)
 259                                         *dotp = '\0';
 260                         }
 261                         return (p->name);
 262                 }
 263         }
 264         p->name = strdup(intoa(addr));
 265         return (p->name);
 266 }
 267
 268 #ifdef INET6
 269 /*
 270  * Return a name for the IP6 address pointed to by ap.  This address
 271  * is assumed to be in network byte order.
 272  */
 273 const char *
 274 getname6(const u_char *ap)
 275 {
 276         register struct hostent *hp;
 277         struct in6_addr addr;
 278         static struct h6namemem *p;             /* static for longjmp() */
 279         register const char *cp;
 280         char ntop_buf[INET6_ADDRSTRLEN];
 281
 282         memcpy(&addr, ap, sizeof(addr));
 283         p = &h6nametable[*(u_int16_t *)&addr.s6_addr[14] & (HASHNAMESIZE-1)];
 284         for (; p->nxt; p = p->nxt) {
 285                 if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
 286                         return (p->name);
 287         }
 288         p->addr = addr;
 289         p->nxt = newh6namemem();
 290
 291         /*
 292          * Do not print names if -n was given.
 293          */
 294         if (!nflag) {
 295                 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET6);
 296                 if (hp) {
 297                         char *dotp;
 298
 299                         p->name = strdup(hp->h_name);
 300                         if (Nflag) {
 301                                 /* Remove domain qualifications */
 302                                 dotp = strchr(p->name, '.');
 303                                 if (dotp)
 304                                         *dotp = '\0';
 305                         }
 306                         return (p->name);
 307                 }
 308         }
 309         cp = inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf));
 310         p->name = strdup(cp);
 311         return (p->name);
 312 }
 313 #endif /* INET6 */
 314
 315 static char hex[] = "0123456789abcdef";
 316
 317
 318 /* Find the hash node that corresponds the ether address 'ep' */
 319
 320 static inline struct enamemem *
 321 lookup_emem(const u_char *ep)
 322 {
 323         register u_int i, j, k;
 324         struct enamemem *tp;
 325
 326         k = (ep[0] << 8) | ep[1];
 327         j = (ep[2] << 8) | ep[3];
 328         i = (ep[4] << 8) | ep[5];
 329
 330         tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
 331         while (tp->e_nxt)
 332                 if (tp->e_addr0 == i &&
 333                     tp->e_addr1 == j &&
 334                     tp->e_addr2 == k)
 335                         return tp;
 336                 else
 337                         tp = tp->e_nxt;
 338         tp->e_addr0 = i;
 339         tp->e_addr1 = j;
 340         tp->e_addr2 = k;
 341         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 342         if (tp->e_nxt == NULL)
 343                 error("lookup_emem: calloc");
 344
 345         return tp;
 346 }
 347
 348 /*
 349  * Find the hash node that corresponds to the bytestring 'bs'
 350  * with length 'nlen'
 351  */
 352
 353 static inline struct enamemem *
 354 lookup_bytestring(register const u_char *bs, const unsigned int nlen)
 355 {
 356         struct enamemem *tp;
 357         register u_int i, j, k;
 358
 359         if (nlen >= 6) {
 360                 k = (bs[0] << 8) | bs[1];
 361                 j = (bs[2] << 8) | bs[3];
 362                 i = (bs[4] << 8) | bs[5];
 363         } else if (nlen >= 4) {
 364                 k = (bs[0] << 8) | bs[1];
 365                 j = (bs[2] << 8) | bs[3];
 366                 i = 0;
 367         } else
 368                 i = j = k = 0;
 369
 370         tp = &bytestringtable[(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                     memcmp((const char *)bs, (const char *)(tp->e_bs), nlen) == 0)
 376                         return tp;
 377                 else
 378                         tp = tp->e_nxt;
 379
 380         tp->e_addr0 = i;
 381         tp->e_addr1 = j;
 382         tp->e_addr2 = k;
 383
 384         tp->e_bs = (u_char *) calloc(1, nlen + 1);
 385         memcpy(tp->e_bs, bs, nlen);
 386         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 387         if (tp->e_nxt == NULL)
 388                 error("lookup_bytestring: calloc");
 389
 390         return tp;
 391 }
 392
 393 /* Find the hash node that corresponds the NSAP 'nsap' */
 394
 395 static inline struct enamemem *
 396 lookup_nsap(register const u_char *nsap)
 397 {
 398         register u_int i, j, k;
 399         unsigned int nlen = *nsap;
 400         struct enamemem *tp;
 401         const u_char *ensap = nsap + nlen - 6;
 402
 403         if (nlen > 6) {
 404                 k = (ensap[0] << 8) | ensap[1];
 405                 j = (ensap[2] << 8) | ensap[3];
 406                 i = (ensap[4] << 8) | ensap[5];
 407         }
 408         else
 409                 i = j = k = 0;
 410
 411         tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
 412         while (tp->e_nxt)
 413                 if (tp->e_addr0 == i &&
 414                     tp->e_addr1 == j &&
 415                     tp->e_addr2 == k &&
 416                     tp->e_nsap[0] == nlen &&
 417                     memcmp((const char *)&(nsap[1]),
 418                         (char *)&(tp->e_nsap[1]), nlen) == 0)
 419                         return tp;
 420                 else
 421                         tp = tp->e_nxt;
 422         tp->e_addr0 = i;
 423         tp->e_addr1 = j;
 424         tp->e_addr2 = k;
 425         tp->e_nsap = (u_char *)malloc(nlen + 1);
 426         if (tp->e_nsap == NULL)
 427                 error("lookup_nsap: malloc");
 428         memcpy((char *)tp->e_nsap, (const char *)nsap, nlen + 1);
 429         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 430         if (tp->e_nxt == NULL)
 431                 error("lookup_nsap: calloc");
 432
 433         return tp;
 434 }
 435
 436 /* Find the hash node that corresponds the protoid 'pi'. */
 437
 438 static inline struct protoidmem *
 439 lookup_protoid(const u_char *pi)
 440 {
 441         register u_int i, j;
 442         struct protoidmem *tp;
 443
 444         /* 5 octets won't be aligned */
 445         i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
 446         j =   (pi[3] << 8) + pi[4];
 447         /* XXX should be endian-insensitive, but do big-endian testing  XXX */
 448
 449         tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
 450         while (tp->p_nxt)
 451                 if (tp->p_oui == i && tp->p_proto == j)
 452                         return tp;
 453                 else
 454                         tp = tp->p_nxt;
 455         tp->p_oui = i;
 456         tp->p_proto = j;
 457         tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
 458         if (tp->p_nxt == NULL)
 459                 error("lookup_protoid: calloc");
 460
 461         return tp;
 462 }
 463
 464 const char *
 465 etheraddr_string(register const u_char *ep)
 466 {
 467         register int i;
 468         register char *cp;
 469         register struct enamemem *tp;
 470         int oui;
 471         char buf[BUFSIZE];
 472
 473         tp = lookup_emem(ep);
 474         if (tp->e_name)
 475                 return (tp->e_name);
 476 #ifdef USE_ETHER_NTOHOST
 477         if (!nflag) {
 478                 char buf2[BUFSIZE];
 479
 480                 /*
 481                  * We don't cast it to "const struct ether_addr *"
 482                  * because some systems fail to declare the second
 483                  * argument as a "const" pointer, even though they
 484                  * don't modify what it points to.
 485                  */
 486                 if (ether_ntohost(buf2, (struct ether_addr *)ep) == 0) {
 487                         tp->e_name = strdup(buf2);
 488                         return (tp->e_name);
 489                 }
 490         }
 491 #endif
 492         cp = buf;
 493         oui = EXTRACT_24BITS(ep);
 494         *cp++ = hex[*ep >> 4 ];
 495         *cp++ = hex[*ep++ & 0xf];
 496         for (i = 5; --i >= 0;) {
 497                 *cp++ = ':';
 498                 *cp++ = hex[*ep >> 4 ];
 499                 *cp++ = hex[*ep++ & 0xf];
 500         }
 501
 502         if (!nflag) {
 503                 snprintf(cp, BUFSIZE - (2 + 5*3), " (oui %s)",
 504                     tok2str(oui_values, "Unknown", oui));
 505         } else
 506                 *cp = '\0';
 507         tp->e_name = strdup(buf);
 508         return (tp->e_name);
 509 }
 510
 511 const char *
 512 linkaddr_string(const u_char *ep, const unsigned int len)
 513 {
 514         register u_int i;
 515         register char *cp;
 516         register struct enamemem *tp;
 517
 518         if (len == ETHER_ADDR_LEN)      /* XXX not totally correct... */
 519                 return etheraddr_string(ep);
 520
 521         tp = lookup_bytestring(ep, len);
 522         if (tp->e_name)
 523                 return (tp->e_name);
 524
 525         tp->e_name = cp = (char *)malloc(len*3);
 526         if (tp->e_name == NULL)
 527                 error("linkaddr_string: malloc");
 528         *cp++ = hex[*ep >> 4];
 529         *cp++ = hex[*ep++ & 0xf];
 530         for (i = len-1; i > 0 ; --i) {
 531                 *cp++ = ':';
 532                 *cp++ = hex[*ep >> 4];
 533                 *cp++ = hex[*ep++ & 0xf];
 534         }
 535         *cp = '\0';
 536         return (tp->e_name);
 537 }
 538
 539 const char *
 540 etherproto_string(u_short port)
 541 {
 542         register char *cp;
 543         register struct hnamemem *tp;
 544         register u_int32_t i = port;
 545         char buf[sizeof("0000")];
 546
 547         for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 548                 if (tp->addr == i)
 549                         return (tp->name);
 550
 551         tp->addr = i;
 552         tp->nxt = newhnamemem();
 553
 554         cp = buf;
 555         NTOHS(port);
 556         *cp++ = hex[port >> 12 & 0xf];
 557         *cp++ = hex[port >> 8 & 0xf];
 558         *cp++ = hex[port >> 4 & 0xf];
 559         *cp++ = hex[port & 0xf];
 560         *cp++ = '\0';
 561         tp->name = strdup(buf);
 562         return (tp->name);
 563 }
 564
 565 const char *
 566 protoid_string(register const u_char *pi)
 567 {
 568         register u_int i, j;
 569         register char *cp;
 570         register struct protoidmem *tp;
 571         char buf[sizeof("00:00:00:00:00")];
 572
 573         tp = lookup_protoid(pi);
 574         if (tp->p_name)
 575                 return tp->p_name;
 576
 577         cp = buf;
 578         if ((j = *pi >> 4) != 0)
 579                 *cp++ = hex[j];
 580         *cp++ = hex[*pi++ & 0xf];
 581         for (i = 4; (int)--i >= 0;) {
 582                 *cp++ = ':';
 583                 if ((j = *pi >> 4) != 0)
 584                         *cp++ = hex[j];
 585                 *cp++ = hex[*pi++ & 0xf];
 586         }
 587         *cp = '\0';
 588         tp->p_name = strdup(buf);
 589         return (tp->p_name);
 590 }
 591
 592 #define ISONSAP_MAX_LENGTH 20
 593 const char *
 594 isonsap_string(const u_char *nsap, register u_int nsap_length)
 595 {
 596         register u_int nsap_idx;
 597         register char *cp;
 598         register struct enamemem *tp;
 599
 600         if (nsap_length < 1 || nsap_length > ISONSAP_MAX_LENGTH)
 601                 return ("isonsap_string: illegal length");
 602
 603         tp = lookup_nsap(nsap);
 604         if (tp->e_name)
 605                 return tp->e_name;
 606
 607         tp->e_name = cp = (char *)malloc(sizeof("xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx"));
 608         if (cp == NULL)
 609                 error("isonsap_string: malloc");
 610
 611         for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
 612                 *cp++ = hex[*nsap >> 4];
 613                 *cp++ = hex[*nsap++ & 0xf];
 614                 if (((nsap_idx & 1) == 0) &&
 615                      (nsap_idx + 1 < nsap_length)) {
 616                         *cp++ = '.';
 617                 }
 618         }
 619         *cp = '\0';
 620         return (tp->e_name);
 621 }
 622
 623 const char *
 624 tcpport_string(u_short port)
 625 {
 626         register struct hnamemem *tp;
 627         register u_int32_t i = port;
 628         char buf[sizeof("00000")];
 629
 630         for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 631                 if (tp->addr == i)
 632                         return (tp->name);
 633
 634         tp->addr = i;
 635         tp->nxt = newhnamemem();
 636
 637         (void)snprintf(buf, sizeof(buf), "%u", i);
 638         tp->name = strdup(buf);
 639         return (tp->name);
 640 }
 641
 642 const char *
 643 udpport_string(register u_short port)
 644 {
 645         register struct hnamemem *tp;
 646         register u_int32_t i = port;
 647         char buf[sizeof("00000")];
 648
 649         for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 650                 if (tp->addr == i)
 651                         return (tp->name);
 652
 653         tp->addr = i;
 654         tp->nxt = newhnamemem();
 655
 656         (void)snprintf(buf, sizeof(buf), "%u", i);
 657         tp->name = strdup(buf);
 658         return (tp->name);
 659 }
 660
 661 const char *
 662 ipxsap_string(u_short port)
 663 {
 664         register char *cp;
 665         register struct hnamemem *tp;
 666         register u_int32_t i = port;
 667         char buf[sizeof("0000")];
 668
 669         for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 670                 if (tp->addr == i)
 671                         return (tp->name);
 672
 673         tp->addr = i;
 674         tp->nxt = newhnamemem();
 675
 676         cp = buf;
 677         NTOHS(port);
 678         *cp++ = hex[port >> 12 & 0xf];
 679         *cp++ = hex[port >> 8 & 0xf];
 680         *cp++ = hex[port >> 4 & 0xf];
 681         *cp++ = hex[port & 0xf];
 682         *cp++ = '\0';
 683         tp->name = strdup(buf);
 684         return (tp->name);
 685 }
 686
 687 static void
 688 init_servarray(void)
 689 {
 690         struct servent *sv;
 691         register struct hnamemem *table;
 692         register int i;
 693         char buf[sizeof("0000000000")];
 694
 695         while ((sv = getservent()) != NULL) {
 696                 int port = ntohs(sv->s_port);
 697                 i = port & (HASHNAMESIZE-1);
 698                 if (strcmp(sv->s_proto, "tcp") == 0)
 699                         table = &tporttable[i];
 700                 else if (strcmp(sv->s_proto, "udp") == 0)
 701                         table = &uporttable[i];
 702                 else
 703                         continue;
 704
 705                 while (table->name)
 706                         table = table->nxt;
 707                 if (nflag) {
 708                         (void)snprintf(buf, sizeof(buf), "%d", port);
 709                         table->name = strdup(buf);
 710                 } else
 711                         table->name = strdup(sv->s_name);
 712                 table->addr = port;
 713                 table->nxt = newhnamemem();
 714         }
 715         endservent();
 716 }
 717
 718 /* in libpcap.a (nametoaddr.c) */
 719 #if defined(WIN32) && !defined(USE_STATIC_LIBPCAP)
 720 __declspec(dllimport)
 721 #else
 722 extern
 723 #endif
 724 const struct eproto {
 725         const char *s;
 726         u_short p;
 727 } eproto_db[];
 728
 729 static void
 730 init_eprotoarray(void)
 731 {
 732         register int i;
 733         register struct hnamemem *table;
 734
 735         for (i = 0; eproto_db[i].s; i++) {
 736                 int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
 737                 table = &eprototable[j];
 738                 while (table->name)
 739                         table = table->nxt;
 740                 table->name = eproto_db[i].s;
 741                 table->addr = htons(eproto_db[i].p);
 742                 table->nxt = newhnamemem();
 743         }
 744 }
 745
 746 static struct protoidlist {
 747         const u_char protoid[5];
 748         const char *name;
 749 } protoidlist[] = {
 750         {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
 751         {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
 752         {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
 753         {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
 754         {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
 755         {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 756 };
 757
 758 /*
 759  * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
 760  * types.
 761  */
 762 static void
 763 init_protoidarray(void)
 764 {
 765         register int i;
 766         register struct protoidmem *tp;
 767         struct protoidlist *pl;
 768         u_char protoid[5];
 769
 770         protoid[0] = 0;
 771         protoid[1] = 0;
 772         protoid[2] = 0;
 773         for (i = 0; eproto_db[i].s; i++) {
 774                 u_short etype = htons(eproto_db[i].p);
 775
 776                 memcpy((char *)&protoid[3], (char *)&etype, 2);
 777                 tp = lookup_protoid(protoid);
 778                 tp->p_name = strdup(eproto_db[i].s);
 779         }
 780         /* Hardwire some SNAP proto ID names */
 781         for (pl = protoidlist; pl->name != NULL; ++pl) {
 782                 tp = lookup_protoid(pl->protoid);
 783                 /* Don't override existing name */
 784                 if (tp->p_name != NULL)
 785                         continue;
 786
 787                 tp->p_name = pl->name;
 788         }
 789 }
 790
 791 static struct etherlist {
 792         const u_char addr[6];
 793         const char *name;
 794 } etherlist[] = {
 795         {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
 796         {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 797 };
 798
 799 /*
 800  * Initialize the ethers hash table.  We take two different approaches
 801  * depending on whether or not the system provides the ethers name
 802  * service.  If it does, we just wire in a few names at startup,
 803  * and etheraddr_string() fills in the table on demand.  If it doesn't,
 804  * then we suck in the entire /etc/ethers file at startup.  The idea
 805  * is that parsing the local file will be fast, but spinning through
 806  * all the ethers entries via NIS & next_etherent might be very slow.
 807  *
 808  * XXX pcap_next_etherent doesn't belong in the pcap interface, but
 809  * since the pcap module already does name-to-address translation,
 810  * it's already does most of the work for the ethernet address-to-name
 811  * translation, so we just pcap_next_etherent as a convenience.
 812  */
 813 static void
 814 init_etherarray(void)
 815 {
 816         register struct etherlist *el;
 817         register struct enamemem *tp;
 818 #ifdef USE_ETHER_NTOHOST
 819         char name[256];
 820 #else
 821         register struct pcap_etherent *ep;
 822         register FILE *fp;
 823
 824         /* Suck in entire ethers file */
 825         fp = fopen(PCAP_ETHERS_FILE, "r");
 826         if (fp != NULL) {
 827                 while ((ep = pcap_next_etherent(fp)) != NULL) {
 828                         tp = lookup_emem(ep->addr);
 829                         tp->e_name = strdup(ep->name);
 830                 }
 831                 (void)fclose(fp);
 832         }
 833 #endif
 834
 835         /* Hardwire some ethernet names */
 836         for (el = etherlist; el->name != NULL; ++el) {
 837                 tp = lookup_emem(el->addr);
 838                 /* Don't override existing name */
 839                 if (tp->e_name != NULL)
 840                         continue;
 841
 842 #ifdef USE_ETHER_NTOHOST
 843                 /*
 844                  * Use YP/NIS version of name if available.
 845                  *
 846                  * We don't cast it to "const struct ether_addr *"
 847                  * because some systems don't modify the Ethernet
 848                  * address but fail to declare the second argument
 849                  * as a "const" pointer.
 850                  */
 851                 if (ether_ntohost(name, (struct ether_addr *)el->addr) == 0) {
 852                         tp->e_name = strdup(name);
 853                         continue;
 854                 }
 855 #endif
 856                 tp->e_name = el->name;
 857         }
 858 }
 859
 860 static struct tok ipxsap_db[] = {
 861         { 0x0000, "Unknown" },
 862         { 0x0001, "User" },
 863         { 0x0002, "User Group" },
 864         { 0x0003, "PrintQueue" },
 865         { 0x0004, "FileServer" },
 866         { 0x0005, "JobServer" },
 867         { 0x0006, "Gateway" },
 868         { 0x0007, "PrintServer" },
 869         { 0x0008, "ArchiveQueue" },
 870         { 0x0009, "ArchiveServer" },
 871         { 0x000a, "JobQueue" },
 872         { 0x000b, "Administration" },
 873         { 0x000F, "Novell TI-RPC" },
 874         { 0x0017, "Diagnostics" },
 875         { 0x0020, "NetBIOS" },
 876         { 0x0021, "NAS SNA Gateway" },
 877         { 0x0023, "NACS AsyncGateway" },
 878         { 0x0024, "RemoteBridge/RoutingService" },
 879         { 0x0026, "BridgeServer" },
 880         { 0x0027, "TCP/IP Gateway" },
 881         { 0x0028, "Point-to-point X.25 BridgeServer" },
 882         { 0x0029, "3270 Gateway" },
 883         { 0x002a, "CHI Corp" },
 884         { 0x002c, "PC Chalkboard" },
 885         { 0x002d, "TimeSynchServer" },
 886         { 0x002e, "ARCserve5.0/PalindromeBackup" },
 887         { 0x0045, "DI3270 Gateway" },
 888         { 0x0047, "AdvertisingPrintServer" },
 889         { 0x004a, "NetBlazerModems" },
 890         { 0x004b, "BtrieveVAP" },
 891         { 0x004c, "NetwareSQL" },
 892         { 0x004d, "XtreeNetwork" },
 893         { 0x0050, "BtrieveVAP4.11" },
 894         { 0x0052, "QuickLink" },
 895         { 0x0053, "PrintQueueUser" },
 896         { 0x0058, "Multipoint X.25 Router" },
 897         { 0x0060, "STLB/NLM" },
 898         { 0x0064, "ARCserve" },
 899         { 0x0066, "ARCserve3.0" },
 900         { 0x0072, "WAN CopyUtility" },
 901         { 0x007a, "TES-NetwareVMS" },
 902         { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" },
 903         { 0x0095, "DDA OBGYN" },
 904         { 0x0098, "NetwareAccessServer" },
 905         { 0x009a, "Netware for VMS II/NamedPipeServer" },
 906         { 0x009b, "NetwareAccessServer" },
 907         { 0x009e, "PortableNetwareServer/SunLinkNVT" },
 908         { 0x00a1, "PowerchuteAPC UPS" },
 909         { 0x00aa, "LAWserve" },
 910         { 0x00ac, "CompaqIDA StatusMonitor" },
 911         { 0x0100, "PIPE STAIL" },
 912         { 0x0102, "LAN ProtectBindery" },
 913         { 0x0103, "OracleDataBaseServer" },
 914         { 0x0107, "Netware386/RSPX RemoteConsole" },
 915         { 0x010f, "NovellSNA Gateway" },
 916         { 0x0111, "TestServer" },
 917         { 0x0112, "HP PrintServer" },
 918         { 0x0114, "CSA MUX" },
 919         { 0x0115, "CSA LCA" },
 920         { 0x0116, "CSA CM" },
 921         { 0x0117, "CSA SMA" },
 922         { 0x0118, "CSA DBA" },
 923         { 0x0119, "CSA NMA" },
 924         { 0x011a, "CSA SSA" },
 925         { 0x011b, "CSA STATUS" },
 926         { 0x011e, "CSA APPC" },
 927         { 0x0126, "SNA TEST SSA Profile" },
 928         { 0x012a, "CSA TRACE" },
 929         { 0x012b, "NetwareSAA" },
 930         { 0x012e, "IKARUS VirusScan" },
 931         { 0x0130, "CommunicationsExecutive" },
 932         { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" },
 933         { 0x0135, "NetwareNamingServicesProfile" },
 934         { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" },
 935         { 0x0141, "LAN SpoolServer" },
 936         { 0x0152, "IRMALAN Gateway" },
 937         { 0x0154, "NamedPipeServer" },
 938         { 0x0166, "NetWareManagement" },
 939         { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" },
 940         { 0x0173, "Compaq" },
 941         { 0x0174, "Compaq SNMP Agent" },
 942         { 0x0175, "Compaq" },
 943         { 0x0180, "XTreeServer/XTreeTools" },
 944         { 0x018A, "NASI ServicesBroadcastServer" },
 945         { 0x01b0, "GARP Gateway" },
 946         { 0x01b1, "Binfview" },
 947         { 0x01bf, "IntelLanDeskManager" },
 948         { 0x01ca, "AXTEC" },
 949         { 0x01cb, "ShivaNetModem/E" },
 950         { 0x01cc, "ShivaLanRover/E" },
 951         { 0x01cd, "ShivaLanRover/T" },
 952         { 0x01ce, "ShivaUniversal" },
 953         { 0x01d8, "CastelleFAXPressServer" },
 954         { 0x01da, "CastelleLANPressPrintServer" },
 955         { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" },
 956         { 0x01f0, "LEGATO" },
 957         { 0x01f5, "LEGATO" },
 958         { 0x0233, "NMS Agent/NetwareManagementAgent" },
 959         { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" },
 960         { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" },
 961         { 0x023a, "LANtern" },
 962         { 0x023c, "MAVERICK" },
 963         { 0x023f, "NovellSMDR" },
 964         { 0x024e, "NetwareConnect" },
 965         { 0x024f, "NASI ServerBroadcast Cisco" },
 966         { 0x026a, "NMS ServiceConsole" },
 967         { 0x026b, "TimeSynchronizationServer Netware 4.x" },
 968         { 0x0278, "DirectoryServer Netware 4.x" },
 969         { 0x027b, "NetwareManagementAgent" },
 970         { 0x0280, "Novell File and Printer Sharing Service for PC" },
 971         { 0x0304, "NovellSAA Gateway" },
 972         { 0x0308, "COM/VERMED" },
 973         { 0x030a, "GalacticommWorldgroupServer" },
 974         { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" },
 975         { 0x0320, "AttachmateGateway" },
 976         { 0x0327, "MicrosoftDiagnostiocs" },
 977         { 0x0328, "WATCOM SQL Server" },
 978         { 0x0335, "MultiTechSystems MultisynchCommServer" },
 979         { 0x0343, "Xylogics RemoteAccessServer/LANModem" },
 980         { 0x0355, "ArcadaBackupExec" },
 981         { 0x0358, "MSLCD1" },
 982         { 0x0361, "NETINELO" },
 983         { 0x037e, "Powerchute UPS Monitoring" },
 984         { 0x037f, "ViruSafeNotify" },
 985         { 0x0386, "HP Bridge" },
 986         { 0x0387, "HP Hub" },
 987         { 0x0394, "NetWare SAA Gateway" },
 988         { 0x039b, "LotusNotes" },
 989         { 0x03b7, "CertusAntiVirus" },
 990         { 0x03c4, "ARCserve4.0" },
 991         { 0x03c7, "LANspool3.5" },
 992         { 0x03d7, "LexmarkPrinterServer" },
 993         { 0x03d8, "LexmarkXLE PrinterServer" },
 994         { 0x03dd, "BanyanENS NetwareClient" },
 995         { 0x03de, "GuptaSequelBaseServer/NetWareSQL" },
 996         { 0x03e1, "UnivelUnixware" },
 997         { 0x03e4, "UnivelUnixware" },
 998         { 0x03fc, "IntelNetport" },
 999         { 0x03fd, "PrintServerQueue" },
1000         { 0x040A, "ipnServer" },
1001         { 0x040D, "LVERRMAN" },
1002         { 0x040E, "LVLIC" },
1003         { 0x0414, "NET Silicon (DPI)/Kyocera" },
1004         { 0x0429, "SiteLockVirus" },
1005         { 0x0432, "UFHELPR???" },
1006         { 0x0433, "Synoptics281xAdvancedSNMPAgent" },
1007         { 0x0444, "MicrosoftNT SNA Server" },
1008         { 0x0448, "Oracle" },
1009         { 0x044c, "ARCserve5.01" },
1010         { 0x0457, "CanonGP55" },
1011         { 0x045a, "QMS Printers" },
1012         { 0x045b, "DellSCSI Array" },
1013         { 0x0491, "NetBlazerModems" },
1014         { 0x04ac, "OnTimeScheduler" },
1015         { 0x04b0, "CD-Net" },
1016         { 0x0513, "EmulexNQA" },
1017         { 0x0520, "SiteLockChecks" },
1018         { 0x0529, "SiteLockChecks" },
1019         { 0x052d, "CitrixOS2 AppServer" },
1020         { 0x0535, "Tektronix" },
1021         { 0x0536, "Milan" },
1022         { 0x055d, "Attachmate SNA gateway" },
1023         { 0x056b, "IBM8235 ModemServer" },
1024         { 0x056c, "ShivaLanRover/E PLUS" },
1025         { 0x056d, "ShivaLanRover/T PLUS" },
1026         { 0x0580, "McAfeeNetShield" },
1027         { 0x05B8, "NLM to workstation communication (Revelation Software)" },
1028         { 0x05BA, "CompatibleSystemsRouters" },
1029         { 0x05BE, "CheyenneHierarchicalStorageManager" },
1030         { 0x0606, "JCWatermarkImaging" },
1031         { 0x060c, "AXISNetworkPrinter" },
1032         { 0x0610, "AdaptecSCSIManagement" },
1033         { 0x0621, "IBM AntiVirus" },
1034         { 0x0640, "Windows95 RemoteRegistryService" },
1035         { 0x064e, "MicrosoftIIS" },
1036         { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1037         { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1038         { 0x076C, "Xerox" },
1039         { 0x079b, "ShivaLanRover/E 115" },
1040         { 0x079c, "ShivaLanRover/T 115" },
1041         { 0x07B4, "CubixWorldDesk" },
1042         { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" },
1043         { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" },
1044         { 0x0810, "ELAN License Server Demo" },
1045         { 0x0824, "ShivaLanRoverAccessSwitch/E" },
1046         { 0x086a, "ISSC Collector" },
1047         { 0x087f, "ISSC DAS AgentAIX" },
1048         { 0x0880, "Intel Netport PRO" },
1049         { 0x0881, "Intel Netport PRO" },
1050         { 0x0b29, "SiteLock" },
1051         { 0x0c29, "SiteLockApplications" },
1052         { 0x0c2c, "LicensingServer" },
1053         { 0x2101, "PerformanceTechnologyInstantInternet" },
1054         { 0x2380, "LAI SiteLock" },
1055         { 0x238c, "MeetingMaker" },
1056         { 0x4808, "SiteLockServer/SiteLockMetering" },
1057         { 0x5555, "SiteLockUser" },
1058         { 0x6312, "Tapeware" },
1059         { 0x6f00, "RabbitGateway" },
1060         { 0x7703, "MODEM" },
1061         { 0x8002, "NetPortPrinters" },
1062         { 0x8008, "WordPerfectNetworkVersion" },
1063         { 0x85BE, "Cisco EIGRP" },
1064         { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" },
1065         { 0x9000, "McAfeeNetShield" },
1066         { 0x9604, "CSA-NT_MON" },
1067         { 0xb6a8, "OceanIsleReachoutRemoteControl" },
1068         { 0xf11f, "SiteLockMetering" },
1069         { 0xf1ff, "SiteLock" },
1070         { 0xf503, "Microsoft SQL Server" },
1071         { 0xF905, "IBM TimeAndPlace" },
1072         { 0xfbfb, "TopCallIII FaxServer" },
1073         { 0xffff, "AnyService/Wildcard" },
1074         { 0, (char *)0 }
1075 };
1076
1077 static void
1078 init_ipxsaparray(void)
1079 {
1080         register int i;
1081         register struct hnamemem *table;
1082
1083         for (i = 0; ipxsap_db[i].s != NULL; i++) {
1084                 int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1);
1085                 table = &ipxsaptable[j];
1086                 while (table->name)
1087                         table = table->nxt;
1088                 table->name = ipxsap_db[i].s;
1089                 table->addr = htons(ipxsap_db[i].v);
1090                 table->nxt = newhnamemem();
1091         }
1092 }
1093
1094 /*
1095  * Initialize the address to name translation machinery.  We map all
1096  * non-local IP addresses to numeric addresses if fflag is true (i.e.,
1097  * to prevent blocking on the nameserver).  localnet is the IP address
1098  * of the local network.  mask is its subnet mask.
1099  */
1100 void
1101 init_addrtoname(u_int32_t localnet, u_int32_t mask)
1102 {
1103         if (fflag) {
1104                 f_localnet = localnet;
1105                 f_netmask = mask;
1106         }
1107         if (nflag)
1108                 /*
1109                  * Simplest way to suppress names.
1110                  */
1111                 return;
1112
1113         init_etherarray();
1114         init_servarray();
1115         init_eprotoarray();
1116         init_protoidarray();
1117         init_ipxsaparray();
1118 }
1119
1120 const char *
1121 dnaddr_string(u_short dnaddr)
1122 {
1123         register struct hnamemem *tp;
1124
1125         for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != 0;
1126              tp = tp->nxt)
1127                 if (tp->addr == dnaddr)
1128                         return (tp->name);
1129
1130         tp->addr = dnaddr;
1131         tp->nxt = newhnamemem();
1132         if (nflag)
1133                 tp->name = dnnum_string(dnaddr);
1134         else
1135                 tp->name = dnname_string(dnaddr);
1136
1137         return(tp->name);
1138 }
1139
1140 /* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */
1141 struct hnamemem *
1142 newhnamemem(void)
1143 {
1144         register struct hnamemem *p;
1145         static struct hnamemem *ptr = NULL;
1146         static u_int num = 0;
1147
1148         if (num  <= 0) {
1149                 num = 64;
1150                 ptr = (struct hnamemem *)calloc(num, sizeof (*ptr));
1151                 if (ptr == NULL)
1152                         error("newhnamemem: calloc");
1153         }
1154         --num;
1155         p = ptr++;
1156         return (p);
1157 }
1158
1159 #ifdef INET6
1160 /* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */
1161 struct h6namemem *
1162 newh6namemem(void)
1163 {
1164         register struct h6namemem *p;
1165         static struct h6namemem *ptr = NULL;
1166         static u_int num = 0;
1167
1168         if (num  <= 0) {
1169                 num = 64;
1170                 ptr = (struct h6namemem *)calloc(num, sizeof (*ptr));
1171                 if (ptr == NULL)
1172                         error("newh6namemem: calloc");
1173         }
1174         --num;
1175         p = ptr++;
1176         return (p);
1177 }
1178 #endif /* INET6 */