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 1.119 2007-08-08 14:06:34 hannes 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
  83 struct hnamemem {
  84         u_int32_t addr;
  85         const char *name;
  86         struct hnamemem *nxt;
  87 };
  88
  89 static struct hnamemem hnametable[HASHNAMESIZE];
  90 static struct hnamemem tporttable[HASHNAMESIZE];
  91 static struct hnamemem uporttable[HASHNAMESIZE];
  92 static struct hnamemem eprototable[HASHNAMESIZE];
  93 static struct hnamemem dnaddrtable[HASHNAMESIZE];
  94 static struct hnamemem ipxsaptable[HASHNAMESIZE];
  95
  96 #if defined(INET6) && defined(WIN32)
  97 /*
  98  * fake gethostbyaddr for Win2k/XP
  99  * gethostbyaddr() returns incorrect value when AF_INET6 is passed
 100  * to 3rd argument.
 101  *
 102  * h_name in struct hostent is only valid.
 103  */
 104 static struct hostent *
 105 win32_gethostbyaddr(const char *addr, int len, int type)
 106 {
 107         static struct hostent host;
 108         static char hostbuf[NI_MAXHOST];
 109         char hname[NI_MAXHOST];
 110         struct sockaddr_in6 addr6;
 111
 112         host.h_name = hostbuf;
 113         switch (type) {
 114         case AF_INET:
 115                 return gethostbyaddr(addr, len, type);
 116                 break;
 117         case AF_INET6:
 118                 memset(&addr6, 0, sizeof(addr6));
 119                 addr6.sin6_family = AF_INET6;
 120                 memcpy(&addr6.sin6_addr, addr, len);
 121                 if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6),
 122                     hname, sizeof(hname), NULL, 0, 0)) {
 123                         return NULL;
 124                 } else {
 125                         strcpy(host.h_name, hname);
 126                         return &host;
 127                 }
 128                 break;
 129         default:
 130                 return NULL;
 131         }
 132 }
 133 #define gethostbyaddr win32_gethostbyaddr
 134 #endif /* INET6 & WIN32 */
 135
 136 #ifdef INET6
 137 struct h6namemem {
 138         struct in6_addr addr;
 139         char *name;
 140         struct h6namemem *nxt;
 141 };
 142
 143 static struct h6namemem h6nametable[HASHNAMESIZE];
 144 #endif /* INET6 */
 145
 146 struct enamemem {
 147         u_short e_addr0;
 148         u_short e_addr1;
 149         u_short e_addr2;
 150         const char *e_name;
 151         u_char *e_nsap;                 /* used only for nsaptable[] */
 152 #define e_bs e_nsap                     /* for bytestringtable */
 153         struct enamemem *e_nxt;
 154 };
 155
 156 static struct enamemem enametable[HASHNAMESIZE];
 157 static struct enamemem nsaptable[HASHNAMESIZE];
 158 static struct enamemem bytestringtable[HASHNAMESIZE];
 159
 160 struct protoidmem {
 161         u_int32_t p_oui;
 162         u_short p_proto;
 163         const char *p_name;
 164         struct protoidmem *p_nxt;
 165 };
 166
 167 static struct protoidmem protoidtable[HASHNAMESIZE];
 168
 169 /*
 170  * A faster replacement for inet_ntoa().
 171  */
 172 const char *
 173 intoa(u_int32_t addr)
 174 {
 175         register char *cp;
 176         register u_int byte;
 177         register int n;
 178         static char buf[sizeof(".xxx.xxx.xxx.xxx")];
 179
 180         NTOHL(addr);
 181         cp = buf + sizeof(buf);
 182         *--cp = '\0';
 183
 184         n = 4;
 185         do {
 186                 byte = addr & 0xff;
 187                 *--cp = byte % 10 + '0';
 188                 byte /= 10;
 189                 if (byte > 0) {
 190                         *--cp = byte % 10 + '0';
 191                         byte /= 10;
 192                         if (byte > 0)
 193                                 *--cp = byte + '0';
 194                 }
 195                 *--cp = '.';
 196                 addr >>= 8;
 197         } while (--n > 0);
 198
 199         return cp + 1;
 200 }
 201
 202 static u_int32_t f_netmask;
 203 static u_int32_t f_localnet;
 204
 205 /*
 206  * Return a name for the IP address pointed to by ap.  This address
 207  * is assumed to be in network byte order.
 208  *
 209  * NOTE: ap is *NOT* necessarily part of the packet data (not even if
 210  * this is being called with the "ipaddr_string()" macro), so you
 211  * *CANNOT* use the TCHECK{2}/TTEST{2} macros on it.  Furthermore,
 212  * even in cases where it *is* part of the packet data, the caller
 213  * would still have to check for a null return value, even if it's
 214  * just printing the return value with "%s" - not all versions of
 215  * printf print "(null)" with "%s" and a null pointer, some of them
 216  * don't check for a null pointer and crash in that case.
 217  *
 218  * The callers of this routine should, before handing this routine
 219  * a pointer to packet data, be sure that the data is present in
 220  * the packet buffer.  They should probably do those checks anyway,
 221  * as other data at that layer might not be IP addresses, and it
 222  * also needs to check whether they're present in the packet buffer.
 223  */
 224 const char *
 225 getname(const u_char *ap)
 226 {
 227         register struct hostent *hp;
 228         u_int32_t addr;
 229         static struct hnamemem *p;              /* static for longjmp() */
 230
 231         memcpy(&addr, ap, sizeof(addr));
 232         p = &hnametable[addr & (HASHNAMESIZE-1)];
 233         for (; p->nxt; p = p->nxt) {
 234                 if (p->addr == addr)
 235                         return (p->name);
 236         }
 237         p->addr = addr;
 238         p->nxt = newhnamemem();
 239
 240         /*
 241          * Print names unless:
 242          *      (1) -n was given.
 243          *      (2) Address is foreign and -f was given. (If -f was not
 244          *          given, f_netmask and f_localnet are 0 and the test
 245          *          evaluates to true)
 246          */
 247         if (!nflag &&
 248             (addr & f_netmask) == f_localnet) {
 249                 hp = gethostbyaddr((char *)&addr, 4, AF_INET);
 250                 if (hp) {
 251                         char *dotp;
 252
 253                         p->name = strdup(hp->h_name);
 254                         if (Nflag) {
 255                                 /* Remove domain qualifications */
 256                                 dotp = strchr(p->name, '.');
 257                                 if (dotp)
 258                                         *dotp = '\0';
 259                         }
 260                         return (p->name);
 261                 }
 262         }
 263         p->name = strdup(intoa(addr));
 264         return (p->name);
 265 }
 266
 267 #ifdef INET6
 268 /*
 269  * Return a name for the IP6 address pointed to by ap.  This address
 270  * is assumed to be in network byte order.
 271  */
 272 const char *
 273 getname6(const u_char *ap)
 274 {
 275         register struct hostent *hp;
 276         struct in6_addr addr;
 277         static struct h6namemem *p;             /* static for longjmp() */
 278         register const char *cp;
 279         char ntop_buf[INET6_ADDRSTRLEN];
 280
 281         memcpy(&addr, ap, sizeof(addr));
 282         p = &h6nametable[*(u_int16_t *)&addr.s6_addr[14] & (HASHNAMESIZE-1)];
 283         for (; p->nxt; p = p->nxt) {
 284                 if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
 285                         return (p->name);
 286         }
 287         p->addr = addr;
 288         p->nxt = newh6namemem();
 289
 290         /*
 291          * Do not print names if -n was given.
 292          */
 293         if (!nflag) {
 294                 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET6);
 295                 if (hp) {
 296                         char *dotp;
 297
 298                         p->name = strdup(hp->h_name);
 299                         if (Nflag) {
 300                                 /* Remove domain qualifications */
 301                                 dotp = strchr(p->name, '.');
 302                                 if (dotp)
 303                                         *dotp = '\0';
 304                         }
 305                         return (p->name);
 306                 }
 307         }
 308         cp = inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf));
 309         p->name = strdup(cp);
 310         return (p->name);
 311 }
 312 #endif /* INET6 */
 313
 314 static const char hex[] = "0123456789abcdef";
 315
 316
 317 /* Find the hash node that corresponds the ether address 'ep' */
 318
 319 static inline struct enamemem *
 320 lookup_emem(const u_char *ep)
 321 {
 322         register u_int i, j, k;
 323         struct enamemem *tp;
 324
 325         k = (ep[0] << 8) | ep[1];
 326         j = (ep[2] << 8) | ep[3];
 327         i = (ep[4] << 8) | ep[5];
 328
 329         tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
 330         while (tp->e_nxt)
 331                 if (tp->e_addr0 == i &&
 332                     tp->e_addr1 == j &&
 333                     tp->e_addr2 == k)
 334                         return tp;
 335                 else
 336                         tp = tp->e_nxt;
 337         tp->e_addr0 = i;
 338         tp->e_addr1 = j;
 339         tp->e_addr2 = k;
 340         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 341         if (tp->e_nxt == NULL)
 342                 error("lookup_emem: calloc");
 343
 344         return tp;
 345 }
 346
 347 /*
 348  * Find the hash node that corresponds to the bytestring 'bs'
 349  * with length 'nlen'
 350  */
 351
 352 static inline struct enamemem *
 353 lookup_bytestring(register const u_char *bs, const unsigned int nlen)
 354 {
 355         struct enamemem *tp;
 356         register u_int i, j, k;
 357
 358         if (nlen >= 6) {
 359                 k = (bs[0] << 8) | bs[1];
 360                 j = (bs[2] << 8) | bs[3];
 361                 i = (bs[4] << 8) | bs[5];
 362         } else if (nlen >= 4) {
 363                 k = (bs[0] << 8) | bs[1];
 364                 j = (bs[2] << 8) | bs[3];
 365                 i = 0;
 366         } else
 367                 i = j = k = 0;
 368
 369         tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)];
 370         while (tp->e_nxt)
 371                 if (tp->e_addr0 == i &&
 372                     tp->e_addr1 == j &&
 373                     tp->e_addr2 == k &&
 374                     memcmp((const char *)bs, (const char *)(tp->e_bs), nlen) == 0)
 375                         return tp;
 376                 else
 377                         tp = tp->e_nxt;
 378
 379         tp->e_addr0 = i;
 380         tp->e_addr1 = j;
 381         tp->e_addr2 = k;
 382
 383         tp->e_bs = (u_char *) calloc(1, nlen + 1);
 384         if (tp->e_bs == NULL)
 385                 error("lookup_bytestring: calloc");
 386
 387         memcpy(tp->e_bs, bs, nlen);
 388         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 389         if (tp->e_nxt == NULL)
 390                 error("lookup_bytestring: calloc");
 391
 392         return tp;
 393 }
 394
 395 /* Find the hash node that corresponds the NSAP 'nsap' */
 396
 397 static inline struct enamemem *
 398 lookup_nsap(register const u_char *nsap)
 399 {
 400         register u_int i, j, k;
 401         unsigned int nlen = *nsap;
 402         struct enamemem *tp;
 403         const u_char *ensap = nsap + nlen - 6;
 404
 405         if (nlen > 6) {
 406                 k = (ensap[0] << 8) | ensap[1];
 407                 j = (ensap[2] << 8) | ensap[3];
 408                 i = (ensap[4] << 8) | ensap[5];
 409         }
 410         else
 411                 i = j = k = 0;
 412
 413         tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
 414         while (tp->e_nxt)
 415                 if (tp->e_addr0 == i &&
 416                     tp->e_addr1 == j &&
 417                     tp->e_addr2 == k &&
 418                     tp->e_nsap[0] == nlen &&
 419                     memcmp((const char *)&(nsap[1]),
 420                         (char *)&(tp->e_nsap[1]), nlen) == 0)
 421                         return tp;
 422                 else
 423                         tp = tp->e_nxt;
 424         tp->e_addr0 = i;
 425         tp->e_addr1 = j;
 426         tp->e_addr2 = k;
 427         tp->e_nsap = (u_char *)malloc(nlen + 1);
 428         if (tp->e_nsap == NULL)
 429                 error("lookup_nsap: malloc");
 430         memcpy((char *)tp->e_nsap, (const char *)nsap, nlen + 1);
 431         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 432         if (tp->e_nxt == NULL)
 433                 error("lookup_nsap: calloc");
 434
 435         return tp;
 436 }
 437
 438 /* Find the hash node that corresponds the protoid 'pi'. */
 439
 440 static inline struct protoidmem *
 441 lookup_protoid(const u_char *pi)
 442 {
 443         register u_int i, j;
 444         struct protoidmem *tp;
 445
 446         /* 5 octets won't be aligned */
 447         i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
 448         j =   (pi[3] << 8) + pi[4];
 449         /* XXX should be endian-insensitive, but do big-endian testing  XXX */
 450
 451         tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
 452         while (tp->p_nxt)
 453                 if (tp->p_oui == i && tp->p_proto == j)
 454                         return tp;
 455                 else
 456                         tp = tp->p_nxt;
 457         tp->p_oui = i;
 458         tp->p_proto = j;
 459         tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
 460         if (tp->p_nxt == NULL)
 461                 error("lookup_protoid: calloc");
 462
 463         return tp;
 464 }
 465
 466 const char *
 467 etheraddr_string(register const u_char *ep)
 468 {
 469         register int i;
 470         register char *cp;
 471         register struct enamemem *tp;
 472         int oui;
 473         char buf[BUFSIZE];
 474
 475         tp = lookup_emem(ep);
 476         if (tp->e_name)
 477                 return (tp->e_name);
 478 #ifdef USE_ETHER_NTOHOST
 479         if (!nflag) {
 480                 char buf2[BUFSIZE];
 481
 482                 /*
 483                  * We don't cast it to "const struct ether_addr *"
 484                  * because some systems fail to declare the second
 485                  * argument as a "const" pointer, even though they
 486                  * don't modify what it points to.
 487                  */
 488                 if (ether_ntohost(buf2, (struct ether_addr *)ep) == 0) {
 489                         tp->e_name = strdup(buf2);
 490                         return (tp->e_name);
 491                 }
 492         }
 493 #endif
 494         cp = buf;
 495         oui = EXTRACT_24BITS(ep);
 496         *cp++ = hex[*ep >> 4 ];
 497         *cp++ = hex[*ep++ & 0xf];
 498         for (i = 5; --i >= 0;) {
 499                 *cp++ = ':';
 500                 *cp++ = hex[*ep >> 4 ];
 501                 *cp++ = hex[*ep++ & 0xf];
 502         }
 503
 504         if (!nflag) {
 505                 snprintf(cp, BUFSIZE - (2 + 5*3), " (oui %s)",
 506                     tok2str(oui_values, "Unknown", oui));
 507         } else
 508                 *cp = '\0';
 509         tp->e_name = strdup(buf);
 510         return (tp->e_name);
 511 }
 512
 513 const char *
 514 le64addr_string(const u_char *ep)
 515 {
 516         const unsigned int len = 8;
 517         register u_int i;
 518         register char *cp;
 519         register struct enamemem *tp;
 520         char buf[BUFSIZE];
 521
 522         tp = lookup_bytestring(ep, len);
 523         if (tp->e_name)
 524                 return (tp->e_name);
 525
 526         cp = buf;
 527         for (i = len; i > 0 ; --i) {
 528                 *cp++ = hex[*(ep + i - 1) >> 4];
 529                 *cp++ = hex[*(ep + i - 1) & 0xf];
 530                 *cp++ = ':';
 531         }
 532         cp --;
 533
 534         *cp = '\0';
 535
 536         tp->e_name = strdup(buf);
 537
 538         return (tp->e_name);
 539 }
 540
 541 const char *
 542 linkaddr_string(const u_char *ep, const unsigned int type, const unsigned int len)
 543 {
 544         register u_int i;
 545         register char *cp;
 546         register struct enamemem *tp;
 547
 548         if (len == 0)
 549                 return ("<empty>");
 550
 551         if (type == LINKADDR_ETHER && len == ETHER_ADDR_LEN)
 552                 return (etheraddr_string(ep));
 553
 554         if (type == LINKADDR_FRELAY)
 555                 return (q922_string(ep));
 556
 557         tp = lookup_bytestring(ep, len);
 558         if (tp->e_name)
 559                 return (tp->e_name);
 560
 561         tp->e_name = cp = (char *)malloc(len*3);
 562         if (tp->e_name == NULL)
 563                 error("linkaddr_string: malloc");
 564         *cp++ = hex[*ep >> 4];
 565         *cp++ = hex[*ep++ & 0xf];
 566         for (i = len-1; i > 0 ; --i) {
 567                 *cp++ = ':';
 568                 *cp++ = hex[*ep >> 4];
 569                 *cp++ = hex[*ep++ & 0xf];
 570         }
 571         *cp = '\0';
 572         return (tp->e_name);
 573 }
 574
 575 const char *
 576 etherproto_string(u_short port)
 577 {
 578         register char *cp;
 579         register struct hnamemem *tp;
 580         register u_int32_t i = port;
 581         char buf[sizeof("0000")];
 582
 583         for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 584                 if (tp->addr == i)
 585                         return (tp->name);
 586
 587         tp->addr = i;
 588         tp->nxt = newhnamemem();
 589
 590         cp = buf;
 591         NTOHS(port);
 592         *cp++ = hex[port >> 12 & 0xf];
 593         *cp++ = hex[port >> 8 & 0xf];
 594         *cp++ = hex[port >> 4 & 0xf];
 595         *cp++ = hex[port & 0xf];
 596         *cp++ = '\0';
 597         tp->name = strdup(buf);
 598         return (tp->name);
 599 }
 600
 601 const char *
 602 protoid_string(register const u_char *pi)
 603 {
 604         register u_int i, j;
 605         register char *cp;
 606         register struct protoidmem *tp;
 607         char buf[sizeof("00:00:00:00:00")];
 608
 609         tp = lookup_protoid(pi);
 610         if (tp->p_name)
 611                 return tp->p_name;
 612
 613         cp = buf;
 614         if ((j = *pi >> 4) != 0)
 615                 *cp++ = hex[j];
 616         *cp++ = hex[*pi++ & 0xf];
 617         for (i = 4; (int)--i >= 0;) {
 618                 *cp++ = ':';
 619                 if ((j = *pi >> 4) != 0)
 620                         *cp++ = hex[j];
 621                 *cp++ = hex[*pi++ & 0xf];
 622         }
 623         *cp = '\0';
 624         tp->p_name = strdup(buf);
 625         return (tp->p_name);
 626 }
 627
 628 #define ISONSAP_MAX_LENGTH 20
 629 const char *
 630 isonsap_string(const u_char *nsap, register u_int nsap_length)
 631 {
 632         register u_int nsap_idx;
 633         register char *cp;
 634         register struct enamemem *tp;
 635
 636         if (nsap_length < 1 || nsap_length > ISONSAP_MAX_LENGTH)
 637                 return ("isonsap_string: illegal length");
 638
 639         tp = lookup_nsap(nsap);
 640         if (tp->e_name)
 641                 return tp->e_name;
 642
 643         tp->e_name = cp = (char *)malloc(sizeof("xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx"));
 644         if (cp == NULL)
 645                 error("isonsap_string: malloc");
 646
 647         for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
 648                 *cp++ = hex[*nsap >> 4];
 649                 *cp++ = hex[*nsap++ & 0xf];
 650                 if (((nsap_idx & 1) == 0) &&
 651                      (nsap_idx + 1 < nsap_length)) {
 652                         *cp++ = '.';
 653                 }
 654         }
 655         *cp = '\0';
 656         return (tp->e_name);
 657 }
 658
 659 const char *
 660 tcpport_string(u_short port)
 661 {
 662         register struct hnamemem *tp;
 663         register u_int32_t i = port;
 664         char buf[sizeof("00000")];
 665
 666         for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 667                 if (tp->addr == i)
 668                         return (tp->name);
 669
 670         tp->addr = i;
 671         tp->nxt = newhnamemem();
 672
 673         (void)snprintf(buf, sizeof(buf), "%u", i);
 674         tp->name = strdup(buf);
 675         return (tp->name);
 676 }
 677
 678 const char *
 679 udpport_string(register u_short port)
 680 {
 681         register struct hnamemem *tp;
 682         register u_int32_t i = port;
 683         char buf[sizeof("00000")];
 684
 685         for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 686                 if (tp->addr == i)
 687                         return (tp->name);
 688
 689         tp->addr = i;
 690         tp->nxt = newhnamemem();
 691
 692         (void)snprintf(buf, sizeof(buf), "%u", i);
 693         tp->name = strdup(buf);
 694         return (tp->name);
 695 }
 696
 697 const char *
 698 ipxsap_string(u_short port)
 699 {
 700         register char *cp;
 701         register struct hnamemem *tp;
 702         register u_int32_t i = port;
 703         char buf[sizeof("0000")];
 704
 705         for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 706                 if (tp->addr == i)
 707                         return (tp->name);
 708
 709         tp->addr = i;
 710         tp->nxt = newhnamemem();
 711
 712         cp = buf;
 713         NTOHS(port);
 714         *cp++ = hex[port >> 12 & 0xf];
 715         *cp++ = hex[port >> 8 & 0xf];
 716         *cp++ = hex[port >> 4 & 0xf];
 717         *cp++ = hex[port & 0xf];
 718         *cp++ = '\0';
 719         tp->name = strdup(buf);
 720         return (tp->name);
 721 }
 722
 723 static void
 724 init_servarray(void)
 725 {
 726         struct servent *sv;
 727         register struct hnamemem *table;
 728         register int i;
 729         char buf[sizeof("0000000000")];
 730
 731         while ((sv = getservent()) != NULL) {
 732                 int port = ntohs(sv->s_port);
 733                 i = port & (HASHNAMESIZE-1);
 734                 if (strcmp(sv->s_proto, "tcp") == 0)
 735                         table = &tporttable[i];
 736                 else if (strcmp(sv->s_proto, "udp") == 0)
 737                         table = &uporttable[i];
 738                 else
 739                         continue;
 740
 741                 while (table->name)
 742                         table = table->nxt;
 743                 if (nflag) {
 744                         (void)snprintf(buf, sizeof(buf), "%d", port);
 745                         table->name = strdup(buf);
 746                 } else
 747                         table->name = strdup(sv->s_name);
 748                 table->addr = port;
 749                 table->nxt = newhnamemem();
 750         }
 751         endservent();
 752 }
 753
 754 /* in libpcap.a (nametoaddr.c) */
 755 #if defined(WIN32) && !defined(USE_STATIC_LIBPCAP)
 756 __declspec(dllimport)
 757 #else
 758 extern
 759 #endif
 760 const struct eproto {
 761         const char *s;
 762         u_short p;
 763 } eproto_db[];
 764
 765 static void
 766 init_eprotoarray(void)
 767 {
 768         register int i;
 769         register struct hnamemem *table;
 770
 771         for (i = 0; eproto_db[i].s; i++) {
 772                 int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
 773                 table = &eprototable[j];
 774                 while (table->name)
 775                         table = table->nxt;
 776                 table->name = eproto_db[i].s;
 777                 table->addr = htons(eproto_db[i].p);
 778                 table->nxt = newhnamemem();
 779         }
 780 }
 781
 782 static const struct protoidlist {
 783         const u_char protoid[5];
 784         const char *name;
 785 } protoidlist[] = {
 786         {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
 787         {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
 788         {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
 789         {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
 790         {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
 791         {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 792 };
 793
 794 /*
 795  * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
 796  * types.
 797  */
 798 static void
 799 init_protoidarray(void)
 800 {
 801         register int i;
 802         register struct protoidmem *tp;
 803         const struct protoidlist *pl;
 804         u_char protoid[5];
 805
 806         protoid[0] = 0;
 807         protoid[1] = 0;
 808         protoid[2] = 0;
 809         for (i = 0; eproto_db[i].s; i++) {
 810                 u_short etype = htons(eproto_db[i].p);
 811
 812                 memcpy((char *)&protoid[3], (char *)&etype, 2);
 813                 tp = lookup_protoid(protoid);
 814                 tp->p_name = strdup(eproto_db[i].s);
 815         }
 816         /* Hardwire some SNAP proto ID names */
 817         for (pl = protoidlist; pl->name != NULL; ++pl) {
 818                 tp = lookup_protoid(pl->protoid);
 819                 /* Don't override existing name */
 820                 if (tp->p_name != NULL)
 821                         continue;
 822
 823                 tp->p_name = pl->name;
 824         }
 825 }
 826
 827 static const struct etherlist {
 828         const u_char addr[6];
 829         const char *name;
 830 } etherlist[] = {
 831         {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
 832         {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 833 };
 834
 835 /*
 836  * Initialize the ethers hash table.  We take two different approaches
 837  * depending on whether or not the system provides the ethers name
 838  * service.  If it does, we just wire in a few names at startup,
 839  * and etheraddr_string() fills in the table on demand.  If it doesn't,
 840  * then we suck in the entire /etc/ethers file at startup.  The idea
 841  * is that parsing the local file will be fast, but spinning through
 842  * all the ethers entries via NIS & next_etherent might be very slow.
 843  *
 844  * XXX pcap_next_etherent doesn't belong in the pcap interface, but
 845  * since the pcap module already does name-to-address translation,
 846  * it's already does most of the work for the ethernet address-to-name
 847  * translation, so we just pcap_next_etherent as a convenience.
 848  */
 849 static void
 850 init_etherarray(void)
 851 {
 852         register const struct etherlist *el;
 853         register struct enamemem *tp;
 854 #ifdef USE_ETHER_NTOHOST
 855         char name[256];
 856 #else
 857         register struct pcap_etherent *ep;
 858         register FILE *fp;
 859
 860         /* Suck in entire ethers file */
 861         fp = fopen(PCAP_ETHERS_FILE, "r");
 862         if (fp != NULL) {
 863                 while ((ep = pcap_next_etherent(fp)) != NULL) {
 864                         tp = lookup_emem(ep->addr);
 865                         tp->e_name = strdup(ep->name);
 866                 }
 867                 (void)fclose(fp);
 868         }
 869 #endif
 870
 871         /* Hardwire some ethernet names */
 872         for (el = etherlist; el->name != NULL; ++el) {
 873                 tp = lookup_emem(el->addr);
 874                 /* Don't override existing name */
 875                 if (tp->e_name != NULL)
 876                         continue;
 877
 878 #ifdef USE_ETHER_NTOHOST
 879                 /*
 880                  * Use YP/NIS version of name if available.
 881                  *
 882                  * We don't cast it to "const struct ether_addr *"
 883                  * because some systems don't modify the Ethernet
 884                  * address but fail to declare the second argument
 885                  * as a "const" pointer.
 886                  */
 887                 if (ether_ntohost(name, (struct ether_addr *)el->addr) == 0) {
 888                         tp->e_name = strdup(name);
 889                         continue;
 890                 }
 891 #endif
 892                 tp->e_name = el->name;
 893         }
 894 }
 895
 896 static const struct tok ipxsap_db[] = {
 897         { 0x0000, "Unknown" },
 898         { 0x0001, "User" },
 899         { 0x0002, "User Group" },
 900         { 0x0003, "PrintQueue" },
 901         { 0x0004, "FileServer" },
 902         { 0x0005, "JobServer" },
 903         { 0x0006, "Gateway" },
 904         { 0x0007, "PrintServer" },
 905         { 0x0008, "ArchiveQueue" },
 906         { 0x0009, "ArchiveServer" },
 907         { 0x000a, "JobQueue" },
 908         { 0x000b, "Administration" },
 909         { 0x000F, "Novell TI-RPC" },
 910         { 0x0017, "Diagnostics" },
 911         { 0x0020, "NetBIOS" },
 912         { 0x0021, "NAS SNA Gateway" },
 913         { 0x0023, "NACS AsyncGateway" },
 914         { 0x0024, "RemoteBridge/RoutingService" },
 915         { 0x0026, "BridgeServer" },
 916         { 0x0027, "TCP/IP Gateway" },
 917         { 0x0028, "Point-to-point X.25 BridgeServer" },
 918         { 0x0029, "3270 Gateway" },
 919         { 0x002a, "CHI Corp" },
 920         { 0x002c, "PC Chalkboard" },
 921         { 0x002d, "TimeSynchServer" },
 922         { 0x002e, "ARCserve5.0/PalindromeBackup" },
 923         { 0x0045, "DI3270 Gateway" },
 924         { 0x0047, "AdvertisingPrintServer" },
 925         { 0x004a, "NetBlazerModems" },
 926         { 0x004b, "BtrieveVAP" },
 927         { 0x004c, "NetwareSQL" },
 928         { 0x004d, "XtreeNetwork" },
 929         { 0x0050, "BtrieveVAP4.11" },
 930         { 0x0052, "QuickLink" },
 931         { 0x0053, "PrintQueueUser" },
 932         { 0x0058, "Multipoint X.25 Router" },
 933         { 0x0060, "STLB/NLM" },
 934         { 0x0064, "ARCserve" },
 935         { 0x0066, "ARCserve3.0" },
 936         { 0x0072, "WAN CopyUtility" },
 937         { 0x007a, "TES-NetwareVMS" },
 938         { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" },
 939         { 0x0095, "DDA OBGYN" },
 940         { 0x0098, "NetwareAccessServer" },
 941         { 0x009a, "Netware for VMS II/NamedPipeServer" },
 942         { 0x009b, "NetwareAccessServer" },
 943         { 0x009e, "PortableNetwareServer/SunLinkNVT" },
 944         { 0x00a1, "PowerchuteAPC UPS" },
 945         { 0x00aa, "LAWserve" },
 946         { 0x00ac, "CompaqIDA StatusMonitor" },
 947         { 0x0100, "PIPE STAIL" },
 948         { 0x0102, "LAN ProtectBindery" },
 949         { 0x0103, "OracleDataBaseServer" },
 950         { 0x0107, "Netware386/RSPX RemoteConsole" },
 951         { 0x010f, "NovellSNA Gateway" },
 952         { 0x0111, "TestServer" },
 953         { 0x0112, "HP PrintServer" },
 954         { 0x0114, "CSA MUX" },
 955         { 0x0115, "CSA LCA" },
 956         { 0x0116, "CSA CM" },
 957         { 0x0117, "CSA SMA" },
 958         { 0x0118, "CSA DBA" },
 959         { 0x0119, "CSA NMA" },
 960         { 0x011a, "CSA SSA" },
 961         { 0x011b, "CSA STATUS" },
 962         { 0x011e, "CSA APPC" },
 963         { 0x0126, "SNA TEST SSA Profile" },
 964         { 0x012a, "CSA TRACE" },
 965         { 0x012b, "NetwareSAA" },
 966         { 0x012e, "IKARUS VirusScan" },
 967         { 0x0130, "CommunicationsExecutive" },
 968         { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" },
 969         { 0x0135, "NetwareNamingServicesProfile" },
 970         { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" },
 971         { 0x0141, "LAN SpoolServer" },
 972         { 0x0152, "IRMALAN Gateway" },
 973         { 0x0154, "NamedPipeServer" },
 974         { 0x0166, "NetWareManagement" },
 975         { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" },
 976         { 0x0173, "Compaq" },
 977         { 0x0174, "Compaq SNMP Agent" },
 978         { 0x0175, "Compaq" },
 979         { 0x0180, "XTreeServer/XTreeTools" },
 980         { 0x018A, "NASI ServicesBroadcastServer" },
 981         { 0x01b0, "GARP Gateway" },
 982         { 0x01b1, "Binfview" },
 983         { 0x01bf, "IntelLanDeskManager" },
 984         { 0x01ca, "AXTEC" },
 985         { 0x01cb, "ShivaNetModem/E" },
 986         { 0x01cc, "ShivaLanRover/E" },
 987         { 0x01cd, "ShivaLanRover/T" },
 988         { 0x01ce, "ShivaUniversal" },
 989         { 0x01d8, "CastelleFAXPressServer" },
 990         { 0x01da, "CastelleLANPressPrintServer" },
 991         { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" },
 992         { 0x01f0, "LEGATO" },
 993         { 0x01f5, "LEGATO" },
 994         { 0x0233, "NMS Agent/NetwareManagementAgent" },
 995         { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" },
 996         { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" },
 997         { 0x023a, "LANtern" },
 998         { 0x023c, "MAVERICK" },
 999         { 0x023f, "NovellSMDR" },
1000         { 0x024e, "NetwareConnect" },
1001         { 0x024f, "NASI ServerBroadcast Cisco" },
1002         { 0x026a, "NMS ServiceConsole" },
1003         { 0x026b, "TimeSynchronizationServer Netware 4.x" },
1004         { 0x0278, "DirectoryServer Netware 4.x" },
1005         { 0x027b, "NetwareManagementAgent" },
1006         { 0x0280, "Novell File and Printer Sharing Service for PC" },
1007         { 0x0304, "NovellSAA Gateway" },
1008         { 0x0308, "COM/VERMED" },
1009         { 0x030a, "GalacticommWorldgroupServer" },
1010         { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" },
1011         { 0x0320, "AttachmateGateway" },
1012         { 0x0327, "MicrosoftDiagnostiocs" },
1013         { 0x0328, "WATCOM SQL Server" },
1014         { 0x0335, "MultiTechSystems MultisynchCommServer" },
1015         { 0x0343, "Xylogics RemoteAccessServer/LANModem" },
1016         { 0x0355, "ArcadaBackupExec" },
1017         { 0x0358, "MSLCD1" },
1018         { 0x0361, "NETINELO" },
1019         { 0x037e, "Powerchute UPS Monitoring" },
1020         { 0x037f, "ViruSafeNotify" },
1021         { 0x0386, "HP Bridge" },
1022         { 0x0387, "HP Hub" },
1023         { 0x0394, "NetWare SAA Gateway" },
1024         { 0x039b, "LotusNotes" },
1025         { 0x03b7, "CertusAntiVirus" },
1026         { 0x03c4, "ARCserve4.0" },
1027         { 0x03c7, "LANspool3.5" },
1028         { 0x03d7, "LexmarkPrinterServer" },
1029         { 0x03d8, "LexmarkXLE PrinterServer" },
1030         { 0x03dd, "BanyanENS NetwareClient" },
1031         { 0x03de, "GuptaSequelBaseServer/NetWareSQL" },
1032         { 0x03e1, "UnivelUnixware" },
1033         { 0x03e4, "UnivelUnixware" },
1034         { 0x03fc, "IntelNetport" },
1035         { 0x03fd, "PrintServerQueue" },
1036         { 0x040A, "ipnServer" },
1037         { 0x040D, "LVERRMAN" },
1038         { 0x040E, "LVLIC" },
1039         { 0x0414, "NET Silicon (DPI)/Kyocera" },
1040         { 0x0429, "SiteLockVirus" },
1041         { 0x0432, "UFHELPR???" },
1042         { 0x0433, "Synoptics281xAdvancedSNMPAgent" },
1043         { 0x0444, "MicrosoftNT SNA Server" },
1044         { 0x0448, "Oracle" },
1045         { 0x044c, "ARCserve5.01" },
1046         { 0x0457, "CanonGP55" },
1047         { 0x045a, "QMS Printers" },
1048         { 0x045b, "DellSCSI Array" },
1049         { 0x0491, "NetBlazerModems" },
1050         { 0x04ac, "OnTimeScheduler" },
1051         { 0x04b0, "CD-Net" },
1052         { 0x0513, "EmulexNQA" },
1053         { 0x0520, "SiteLockChecks" },
1054         { 0x0529, "SiteLockChecks" },
1055         { 0x052d, "CitrixOS2 AppServer" },
1056         { 0x0535, "Tektronix" },
1057         { 0x0536, "Milan" },
1058         { 0x055d, "Attachmate SNA gateway" },
1059         { 0x056b, "IBM8235 ModemServer" },
1060         { 0x056c, "ShivaLanRover/E PLUS" },
1061         { 0x056d, "ShivaLanRover/T PLUS" },
1062         { 0x0580, "McAfeeNetShield" },
1063         { 0x05B8, "NLM to workstation communication (Revelation Software)" },
1064         { 0x05BA, "CompatibleSystemsRouters" },
1065         { 0x05BE, "CheyenneHierarchicalStorageManager" },
1066         { 0x0606, "JCWatermarkImaging" },
1067         { 0x060c, "AXISNetworkPrinter" },
1068         { 0x0610, "AdaptecSCSIManagement" },
1069         { 0x0621, "IBM AntiVirus" },
1070         { 0x0640, "Windows95 RemoteRegistryService" },
1071         { 0x064e, "MicrosoftIIS" },
1072         { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1073         { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1074         { 0x076C, "Xerox" },
1075         { 0x079b, "ShivaLanRover/E 115" },
1076         { 0x079c, "ShivaLanRover/T 115" },
1077         { 0x07B4, "CubixWorldDesk" },
1078         { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" },
1079         { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" },
1080         { 0x0810, "ELAN License Server Demo" },
1081         { 0x0824, "ShivaLanRoverAccessSwitch/E" },
1082         { 0x086a, "ISSC Collector" },
1083         { 0x087f, "ISSC DAS AgentAIX" },
1084         { 0x0880, "Intel Netport PRO" },
1085         { 0x0881, "Intel Netport PRO" },
1086         { 0x0b29, "SiteLock" },
1087         { 0x0c29, "SiteLockApplications" },
1088         { 0x0c2c, "LicensingServer" },
1089         { 0x2101, "PerformanceTechnologyInstantInternet" },
1090         { 0x2380, "LAI SiteLock" },
1091         { 0x238c, "MeetingMaker" },
1092         { 0x4808, "SiteLockServer/SiteLockMetering" },
1093         { 0x5555, "SiteLockUser" },
1094         { 0x6312, "Tapeware" },
1095         { 0x6f00, "RabbitGateway" },
1096         { 0x7703, "MODEM" },
1097         { 0x8002, "NetPortPrinters" },
1098         { 0x8008, "WordPerfectNetworkVersion" },
1099         { 0x85BE, "Cisco EIGRP" },
1100         { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" },
1101         { 0x9000, "McAfeeNetShield" },
1102         { 0x9604, "CSA-NT_MON" },
1103         { 0xb6a8, "OceanIsleReachoutRemoteControl" },
1104         { 0xf11f, "SiteLockMetering" },
1105         { 0xf1ff, "SiteLock" },
1106         { 0xf503, "Microsoft SQL Server" },
1107         { 0xF905, "IBM TimeAndPlace" },
1108         { 0xfbfb, "TopCallIII FaxServer" },
1109         { 0xffff, "AnyService/Wildcard" },
1110         { 0, (char *)0 }
1111 };
1112
1113 static void
1114 init_ipxsaparray(void)
1115 {
1116         register int i;
1117         register struct hnamemem *table;
1118
1119         for (i = 0; ipxsap_db[i].s != NULL; i++) {
1120                 int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1);
1121                 table = &ipxsaptable[j];
1122                 while (table->name)
1123                         table = table->nxt;
1124                 table->name = ipxsap_db[i].s;
1125                 table->addr = htons(ipxsap_db[i].v);
1126                 table->nxt = newhnamemem();
1127         }
1128 }
1129
1130 /*
1131  * Initialize the address to name translation machinery.  We map all
1132  * non-local IP addresses to numeric addresses if fflag is true (i.e.,
1133  * to prevent blocking on the nameserver).  localnet is the IP address
1134  * of the local network.  mask is its subnet mask.
1135  */
1136 void
1137 init_addrtoname(u_int32_t localnet, u_int32_t mask)
1138 {
1139         if (fflag) {
1140                 f_localnet = localnet;
1141                 f_netmask = mask;
1142         }
1143         if (nflag)
1144                 /*
1145                  * Simplest way to suppress names.
1146                  */
1147                 return;
1148
1149         init_etherarray();
1150         init_servarray();
1151         init_eprotoarray();
1152         init_protoidarray();
1153         init_ipxsaparray();
1154 }
1155
1156 const char *
1157 dnaddr_string(u_short dnaddr)
1158 {
1159         register struct hnamemem *tp;
1160
1161         for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != 0;
1162              tp = tp->nxt)
1163                 if (tp->addr == dnaddr)
1164                         return (tp->name);
1165
1166         tp->addr = dnaddr;
1167         tp->nxt = newhnamemem();
1168         if (nflag)
1169                 tp->name = dnnum_string(dnaddr);
1170         else
1171                 tp->name = dnname_string(dnaddr);
1172
1173         return(tp->name);
1174 }
1175
1176 /* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */
1177 struct hnamemem *
1178 newhnamemem(void)
1179 {
1180         register struct hnamemem *p;
1181         static struct hnamemem *ptr = NULL;
1182         static u_int num = 0;
1183
1184         if (num  <= 0) {
1185                 num = 64;
1186                 ptr = (struct hnamemem *)calloc(num, sizeof (*ptr));
1187                 if (ptr == NULL)
1188                         error("newhnamemem: calloc");
1189         }
1190         --num;
1191         p = ptr++;
1192         return (p);
1193 }
1194
1195 #ifdef INET6
1196 /* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */
1197 struct h6namemem *
1198 newh6namemem(void)
1199 {
1200         register struct h6namemem *p;
1201         static struct h6namemem *ptr = NULL;
1202         static u_int num = 0;
1203
1204         if (num  <= 0) {
1205                 num = 64;
1206                 ptr = (struct h6namemem *)calloc(num, sizeof (*ptr));
1207                 if (ptr == NULL)
1208                         error("newh6namemem: calloc");
1209         }
1210         --num;
1211         p = ptr++;
1212         return (p);
1213 }
1214 #endif /* INET6 */