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[] =
  26     "@(#) $Header: /tcpdump/master/tcpdump/addrtoname.c,v 1.96 2003-07-31 22:36:44 fenner 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                 if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6),
 107                         hname, sizeof(hname), NULL, 0, 0)) {
 108                     return NULL;
 109                 } else {
 110                         strcpy(host.h_name, hname);
 111                         return &host;
 112                 }
 113                 break;
 114         default:
 115                 return NULL;
 116         }
 117 }
 118 #define gethostbyaddr win32_gethostbyaddr
 119 #endif /* INET6 & WIN32*/
 120
 121 #ifdef INET6
 122 struct h6namemem {
 123         struct in6_addr addr;
 124         char *name;
 125         struct h6namemem *nxt;
 126 };
 127
 128 struct h6namemem h6nametable[HASHNAMESIZE];
 129 #endif /* INET6 */
 130
 131 struct enamemem {
 132         u_short e_addr0;
 133         u_short e_addr1;
 134         u_short e_addr2;
 135         const char *e_name;
 136         u_char *e_nsap;                 /* used only for nsaptable[] */
 137 #define e_bs e_nsap                     /* for bytestringtable */
 138         struct enamemem *e_nxt;
 139 };
 140
 141 struct enamemem enametable[HASHNAMESIZE];
 142 struct enamemem nsaptable[HASHNAMESIZE];
 143 struct enamemem bytestringtable[HASHNAMESIZE];
 144
 145 struct protoidmem {
 146         u_int32_t p_oui;
 147         u_short p_proto;
 148         const char *p_name;
 149         struct protoidmem *p_nxt;
 150 };
 151
 152 struct protoidmem protoidtable[HASHNAMESIZE];
 153
 154 /*
 155  * A faster replacement for inet_ntoa().
 156  */
 157 const char *
 158 intoa(u_int32_t addr)
 159 {
 160         register char *cp;
 161         register u_int byte;
 162         register int n;
 163         static char buf[sizeof(".xxx.xxx.xxx.xxx")];
 164
 165         NTOHL(addr);
 166         cp = &buf[sizeof buf];
 167         *--cp = '\0';
 168
 169         n = 4;
 170         do {
 171                 byte = addr & 0xff;
 172                 *--cp = byte % 10 + '0';
 173                 byte /= 10;
 174                 if (byte > 0) {
 175                         *--cp = byte % 10 + '0';
 176                         byte /= 10;
 177                         if (byte > 0)
 178                                 *--cp = byte + '0';
 179                 }
 180                 *--cp = '.';
 181                 addr >>= 8;
 182         } while (--n > 0);
 183
 184         return cp + 1;
 185 }
 186
 187 static u_int32_t f_netmask;
 188 static u_int32_t f_localnet;
 189 static u_int32_t netmask;
 190
 191 /*
 192  * Return a name for the IP address pointed to by ap.  This address
 193  * is assumed to be in network byte order.
 194  */
 195 const char *
 196 getname(const u_char *ap)
 197 {
 198         register struct hostent *hp;
 199         u_int32_t addr;
 200         static struct hnamemem *p;              /* static for longjmp() */
 201
 202         memcpy(&addr, ap, sizeof(addr));
 203         p = &hnametable[addr & (HASHNAMESIZE-1)];
 204         for (; p->nxt; p = p->nxt) {
 205                 if (p->addr == addr)
 206                         return (p->name);
 207         }
 208         p->addr = addr;
 209         p->nxt = newhnamemem();
 210
 211         /*
 212          * Print names unless:
 213          *      (1) -n was given.
 214          *      (2) Address is foreign and -f was given. (If -f was not
 215          *          given, f_netmask and f_localnet are 0 and the test
 216          *          evaluates to true)
 217          */
 218         if (!nflag &&
 219             (addr & f_netmask) == f_localnet) {
 220                 hp = gethostbyaddr((char *)&addr, 4, AF_INET);
 221                 if (hp) {
 222                         char *dotp;
 223
 224                         p->name = strdup(hp->h_name);
 225                         if (Nflag) {
 226                                 /* Remove domain qualifications */
 227                                 dotp = strchr(p->name, '.');
 228                                 if (dotp)
 229                                         *dotp = '\0';
 230                         }
 231                         return (p->name);
 232                 }
 233         }
 234         p->name = strdup(intoa(addr));
 235         return (p->name);
 236 }
 237
 238 #ifdef INET6
 239 /*
 240  * Return a name for the IP6 address pointed to by ap.  This address
 241  * is assumed to be in network byte order.
 242  */
 243 const char *
 244 getname6(const u_char *ap)
 245 {
 246         register struct hostent *hp;
 247         struct in6_addr addr;
 248         static struct h6namemem *p;             /* static for longjmp() */
 249         register const char *cp;
 250         char ntop_buf[INET6_ADDRSTRLEN];
 251
 252         memcpy(&addr, ap, sizeof(addr));
 253         p = &h6nametable[*(u_int16_t *)&addr.s6_addr[14] & (HASHNAMESIZE-1)];
 254         for (; p->nxt; p = p->nxt) {
 255                 if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
 256                         return (p->name);
 257         }
 258         p->addr = addr;
 259         p->nxt = newh6namemem();
 260
 261         /*
 262          * Do not print names if -n was given.
 263          */
 264         if (!nflag) {
 265                 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET6);
 266                 if (hp) {
 267                         char *dotp;
 268
 269                         p->name = strdup(hp->h_name);
 270                         if (Nflag) {
 271                                 /* Remove domain qualifications */
 272                                 dotp = strchr(p->name, '.');
 273                                 if (dotp)
 274                                         *dotp = '\0';
 275                         }
 276                         return (p->name);
 277                 }
 278         }
 279         cp = inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf));
 280         p->name = strdup(cp);
 281         return (p->name);
 282 }
 283 #endif /* INET6 */
 284
 285 static char hex[] = "0123456789abcdef";
 286
 287
 288 /* Find the hash node that corresponds the ether address 'ep' */
 289
 290 static inline struct enamemem *
 291 lookup_emem(const u_char *ep)
 292 {
 293         register u_int i, j, k;
 294         struct enamemem *tp;
 295
 296         k = (ep[0] << 8) | ep[1];
 297         j = (ep[2] << 8) | ep[3];
 298         i = (ep[4] << 8) | ep[5];
 299
 300         tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
 301         while (tp->e_nxt)
 302                 if (tp->e_addr0 == i &&
 303                     tp->e_addr1 == j &&
 304                     tp->e_addr2 == k)
 305                         return tp;
 306                 else
 307                         tp = tp->e_nxt;
 308         tp->e_addr0 = i;
 309         tp->e_addr1 = j;
 310         tp->e_addr2 = k;
 311         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 312         if (tp->e_nxt == NULL)
 313                 error("lookup_emem: calloc");
 314
 315         return tp;
 316 }
 317
 318 /*
 319  * Find the hash node that corresponds to the bytestring 'bs'
 320  * with length 'nlen'
 321  */
 322
 323 static inline struct enamemem *
 324 lookup_bytestring(register const u_char *bs, const unsigned int nlen)
 325 {
 326         struct enamemem *tp;
 327         register u_int i, j, k;
 328
 329         if (nlen >= 6) {
 330                 k = (bs[0] << 8) | bs[1];
 331                 j = (bs[2] << 8) | bs[3];
 332                 i = (bs[4] << 8) | bs[5];
 333         } else if (nlen >= 4) {
 334                 k = (bs[0] << 8) | bs[1];
 335                 j = (bs[2] << 8) | bs[3];
 336                 i = 0;
 337         } else
 338                 i = j = k = 0;
 339
 340         tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)];
 341         while (tp->e_nxt)
 342                 if (tp->e_addr0 == i &&
 343                     tp->e_addr1 == j &&
 344                     tp->e_addr2 == k &&
 345                     memcmp((const char *)bs, (const char *)(tp->e_bs), nlen) == 0)
 346                         return tp;
 347                 else
 348                         tp = tp->e_nxt;
 349
 350         tp->e_addr0 = i;
 351         tp->e_addr1 = j;
 352         tp->e_addr2 = k;
 353
 354         tp->e_bs = (u_char *) calloc(1, nlen + 1);
 355         memcpy(tp->e_bs, bs, nlen);
 356         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 357         if (tp->e_nxt == NULL)
 358                 error("lookup_bytestring: calloc");
 359
 360         return tp;
 361 }
 362
 363 /* Find the hash node that corresponds the NSAP 'nsap' */
 364
 365 static inline struct enamemem *
 366 lookup_nsap(register const u_char *nsap)
 367 {
 368         register u_int i, j, k;
 369         unsigned int nlen = *nsap;
 370         struct enamemem *tp;
 371         const u_char *ensap = nsap + nlen - 6;
 372
 373         if (nlen > 6) {
 374                 k = (ensap[0] << 8) | ensap[1];
 375                 j = (ensap[2] << 8) | ensap[3];
 376                 i = (ensap[4] << 8) | ensap[5];
 377         }
 378         else
 379                 i = j = k = 0;
 380
 381         tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
 382         while (tp->e_nxt)
 383                 if (tp->e_addr0 == i &&
 384                     tp->e_addr1 == j &&
 385                     tp->e_addr2 == k &&
 386                     tp->e_nsap[0] == nlen &&
 387                     memcmp((const char *)&(nsap[1]),
 388                         (char *)&(tp->e_nsap[1]), nlen) == 0)
 389                         return tp;
 390                 else
 391                         tp = tp->e_nxt;
 392         tp->e_addr0 = i;
 393         tp->e_addr1 = j;
 394         tp->e_addr2 = k;
 395         tp->e_nsap = (u_char *)malloc(nlen + 1);
 396         if (tp->e_nsap == NULL)
 397                 error("lookup_nsap: malloc");
 398         memcpy((char *)tp->e_nsap, (const char *)nsap, nlen + 1);
 399         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 400         if (tp->e_nxt == NULL)
 401                 error("lookup_nsap: calloc");
 402
 403         return tp;
 404 }
 405
 406 /* Find the hash node that corresponds the protoid 'pi'. */
 407
 408 static inline struct protoidmem *
 409 lookup_protoid(const u_char *pi)
 410 {
 411         register u_int i, j;
 412         struct protoidmem *tp;
 413
 414         /* 5 octets won't be aligned */
 415         i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
 416         j =   (pi[3] << 8) + pi[4];
 417         /* XXX should be endian-insensitive, but do big-endian testing  XXX */
 418
 419         tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
 420         while (tp->p_nxt)
 421                 if (tp->p_oui == i && tp->p_proto == j)
 422                         return tp;
 423                 else
 424                         tp = tp->p_nxt;
 425         tp->p_oui = i;
 426         tp->p_proto = j;
 427         tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
 428         if (tp->p_nxt == NULL)
 429                 error("lookup_protoid: calloc");
 430
 431         return tp;
 432 }
 433
 434 const char *
 435 etheraddr_string(register const u_char *ep)
 436 {
 437         register u_int i;
 438         register char *cp;
 439         register struct enamemem *tp;
 440         char buf[sizeof("00:00:00:00:00:00")];
 441
 442         tp = lookup_emem(ep);
 443         if (tp->e_name)
 444                 return (tp->e_name);
 445 #ifdef USE_ETHER_NTOHOST
 446         if (!nflag) {
 447                 char buf2[128];
 448                 if (ether_ntohost(buf2, (const struct ether_addr *)ep) == 0) {
 449                         tp->e_name = strdup(buf2);
 450                         return (tp->e_name);
 451                 }
 452         }
 453 #endif
 454         cp = buf;
 455         *cp++ = hex[*ep >> 4 ];
 456         *cp++ = hex[*ep++ & 0xf];
 457         for (i = 5; (int)--i >= 0;) {
 458                 *cp++ = ':';
 459                 *cp++ = hex[*ep >> 4 ];
 460                 *cp++ = hex[*ep++ & 0xf];
 461         }
 462         *cp = '\0';
 463         tp->e_name = strdup(buf);
 464         return (tp->e_name);
 465 }
 466
 467 const char *
 468 linkaddr_string(const u_char *ep, const unsigned int len)
 469 {
 470         register u_int i, j;
 471         register char *cp;
 472         register struct enamemem *tp;
 473
 474         if (len == 6)   /* XXX not totally correct... */
 475                 return etheraddr_string(ep);
 476
 477         tp = lookup_bytestring(ep, len);
 478         if (tp->e_name)
 479                 return (tp->e_name);
 480
 481         tp->e_name = cp = (char *)malloc(len*3);
 482         if (tp->e_name == NULL)
 483                 error("linkaddr_string: malloc");
 484         if ((j = *ep >> 4) != 0)
 485                 *cp++ = hex[j];
 486         *cp++ = hex[*ep++ & 0xf];
 487         for (i = len-1; i > 0 ; --i) {
 488                 *cp++ = ':';
 489                 if ((j = *ep >> 4) != 0)
 490                         *cp++ = hex[j];
 491                 *cp++ = hex[*ep++ & 0xf];
 492         }
 493         *cp = '\0';
 494         return (tp->e_name);
 495 }
 496
 497 const char *
 498 etherproto_string(u_short port)
 499 {
 500         register char *cp;
 501         register struct hnamemem *tp;
 502         register u_int32_t i = port;
 503         char buf[sizeof("0000")];
 504
 505         for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 506                 if (tp->addr == i)
 507                         return (tp->name);
 508
 509         tp->addr = i;
 510         tp->nxt = newhnamemem();
 511
 512         cp = buf;
 513         NTOHS(port);
 514         *cp++ = hex[port >> 12 & 0xf];
 515         *cp++ = hex[port >> 8 & 0xf];
 516         *cp++ = hex[port >> 4 & 0xf];
 517         *cp++ = hex[port & 0xf];
 518         *cp++ = '\0';
 519         tp->name = strdup(buf);
 520         return (tp->name);
 521 }
 522
 523 const char *
 524 protoid_string(register const u_char *pi)
 525 {
 526         register u_int i, j;
 527         register char *cp;
 528         register struct protoidmem *tp;
 529         char buf[sizeof("00:00:00:00:00")];
 530
 531         tp = lookup_protoid(pi);
 532         if (tp->p_name)
 533                 return tp->p_name;
 534
 535         cp = buf;
 536         if ((j = *pi >> 4) != 0)
 537                 *cp++ = hex[j];
 538         *cp++ = hex[*pi++ & 0xf];
 539         for (i = 4; (int)--i >= 0;) {
 540                 *cp++ = ':';
 541                 if ((j = *pi >> 4) != 0)
 542                         *cp++ = hex[j];
 543                 *cp++ = hex[*pi++ & 0xf];
 544         }
 545         *cp = '\0';
 546         tp->p_name = strdup(buf);
 547         return (tp->p_name);
 548 }
 549
 550 const char *
 551 llcsap_string(u_char sap)
 552 {
 553         register struct hnamemem *tp;
 554         register u_int32_t i = sap;
 555         char buf[sizeof("sap 00")];
 556
 557         for (tp = &llcsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 558                 if (tp->addr == i)
 559                         return (tp->name);
 560
 561         tp->addr = i;
 562         tp->nxt = newhnamemem();
 563
 564         snprintf(buf, sizeof(buf), "sap %02x", sap & 0xff);
 565         tp->name = strdup(buf);
 566         return (tp->name);
 567 }
 568
 569 const char *
 570 isonsap_string(const u_char *nsap)
 571 {
 572         register u_int i, nlen = nsap[0];
 573         register char *cp;
 574         register struct enamemem *tp;
 575
 576         tp = lookup_nsap(nsap);
 577         if (tp->e_name)
 578                 return tp->e_name;
 579
 580         tp->e_name = cp = (char *)malloc(nlen * 2 + 2);
 581         if (cp == NULL)
 582                 error("isonsap_string: malloc");
 583
 584         nsap++;
 585         *cp++ = '/';
 586         for (i = nlen; (int)--i >= 0;) {
 587                 *cp++ = hex[*nsap >> 4];
 588                 *cp++ = hex[*nsap++ & 0xf];
 589         }
 590         *cp = '\0';
 591         return (tp->e_name);
 592 }
 593
 594 const char *
 595 tcpport_string(u_short port)
 596 {
 597         register struct hnamemem *tp;
 598         register u_int32_t i = port;
 599         char buf[sizeof("00000")];
 600
 601         for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 602                 if (tp->addr == i)
 603                         return (tp->name);
 604
 605         tp->addr = i;
 606         tp->nxt = newhnamemem();
 607
 608         (void)snprintf(buf, sizeof(buf), "%u", i);
 609         tp->name = strdup(buf);
 610         return (tp->name);
 611 }
 612
 613 const char *
 614 udpport_string(register 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 = &uporttable[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 ipxsap_string(u_short port)
 634 {
 635         register char *cp;
 636         register struct hnamemem *tp;
 637         register u_int32_t i = port;
 638         char buf[sizeof("0000")];
 639
 640         for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 641                 if (tp->addr == i)
 642                         return (tp->name);
 643
 644         tp->addr = i;
 645         tp->nxt = newhnamemem();
 646
 647         cp = buf;
 648         NTOHS(port);
 649         *cp++ = hex[port >> 12 & 0xf];
 650         *cp++ = hex[port >> 8 & 0xf];
 651         *cp++ = hex[port >> 4 & 0xf];
 652         *cp++ = hex[port & 0xf];
 653         *cp++ = '\0';
 654         tp->name = strdup(buf);
 655         return (tp->name);
 656 }
 657
 658 static void
 659 init_servarray(void)
 660 {
 661         struct servent *sv;
 662         register struct hnamemem *table;
 663         register int i;
 664         char buf[sizeof("0000000000")];
 665
 666         while ((sv = getservent()) != NULL) {
 667                 int port = ntohs(sv->s_port);
 668                 i = port & (HASHNAMESIZE-1);
 669                 if (strcmp(sv->s_proto, "tcp") == 0)
 670                         table = &tporttable[i];
 671                 else if (strcmp(sv->s_proto, "udp") == 0)
 672                         table = &uporttable[i];
 673                 else
 674                         continue;
 675
 676                 while (table->name)
 677                         table = table->nxt;
 678                 if (nflag) {
 679                         (void)snprintf(buf, sizeof(buf), "%d", port);
 680                         table->name = strdup(buf);
 681                 } else
 682                         table->name = strdup(sv->s_name);
 683                 table->addr = port;
 684                 table->nxt = newhnamemem();
 685         }
 686         endservent();
 687 }
 688
 689 /*XXX from libbpfc.a */
 690 #ifndef WIN32
 691 extern struct eproto {
 692 #else
 693 __declspec( dllimport) struct eproto {
 694 #endif
 695         char *s;
 696         u_short p;
 697 } eproto_db[];
 698
 699 static void
 700 init_eprotoarray(void)
 701 {
 702         register int i;
 703         register struct hnamemem *table;
 704
 705         for (i = 0; eproto_db[i].s; i++) {
 706                 int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
 707                 table = &eprototable[j];
 708                 while (table->name)
 709                         table = table->nxt;
 710                 table->name = eproto_db[i].s;
 711                 table->addr = htons(eproto_db[i].p);
 712                 table->nxt = newhnamemem();
 713         }
 714 }
 715
 716 static struct protoidlist {
 717         const u_char protoid[5];
 718         const char *name;
 719 } protoidlist[] = {
 720         {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
 721         {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
 722         {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
 723         {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
 724         {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
 725         {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 726 };
 727
 728 /*
 729  * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
 730  * types.
 731  */
 732 static void
 733 init_protoidarray(void)
 734 {
 735         register int i;
 736         register struct protoidmem *tp;
 737         struct protoidlist *pl;
 738         u_char protoid[5];
 739
 740         protoid[0] = 0;
 741         protoid[1] = 0;
 742         protoid[2] = 0;
 743         for (i = 0; eproto_db[i].s; i++) {
 744                 u_short etype = htons(eproto_db[i].p);
 745
 746                 memcpy((char *)&protoid[3], (char *)&etype, 2);
 747                 tp = lookup_protoid(protoid);
 748                 tp->p_name = strdup(eproto_db[i].s);
 749         }
 750         /* Hardwire some SNAP proto ID names */
 751         for (pl = protoidlist; pl->name != NULL; ++pl) {
 752                 tp = lookup_protoid(pl->protoid);
 753                 /* Don't override existing name */
 754                 if (tp->p_name != NULL)
 755                         continue;
 756
 757                 tp->p_name = pl->name;
 758         }
 759 }
 760
 761 static struct etherlist {
 762         const u_char addr[6];
 763         const char *name;
 764 } etherlist[] = {
 765         {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
 766         {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 767 };
 768
 769 /*
 770  * Initialize the ethers hash table.  We take two different approaches
 771  * depending on whether or not the system provides the ethers name
 772  * service.  If it does, we just wire in a few names at startup,
 773  * and etheraddr_string() fills in the table on demand.  If it doesn't,
 774  * then we suck in the entire /etc/ethers file at startup.  The idea
 775  * is that parsing the local file will be fast, but spinning through
 776  * all the ethers entries via NIS & next_etherent might be very slow.
 777  *
 778  * XXX pcap_next_etherent doesn't belong in the pcap interface, but
 779  * since the pcap module already does name-to-address translation,
 780  * it's already does most of the work for the ethernet address-to-name
 781  * translation, so we just pcap_next_etherent as a convenience.
 782  */
 783 static void
 784 init_etherarray(void)
 785 {
 786         register struct etherlist *el;
 787         register struct enamemem *tp;
 788 #ifdef USE_ETHER_NTOHOST
 789         char name[256];
 790 #else
 791         register struct pcap_etherent *ep;
 792         register FILE *fp;
 793
 794         /* Suck in entire ethers file */
 795         fp = fopen(PCAP_ETHERS_FILE, "r");
 796         if (fp != NULL) {
 797                 while ((ep = pcap_next_etherent(fp)) != NULL) {
 798                         tp = lookup_emem(ep->addr);
 799                         tp->e_name = strdup(ep->name);
 800                 }
 801                 (void)fclose(fp);
 802         }
 803 #endif
 804
 805         /* Hardwire some ethernet names */
 806         for (el = etherlist; el->name != NULL; ++el) {
 807                 tp = lookup_emem(el->addr);
 808                 /* Don't override existing name */
 809                 if (tp->e_name != NULL)
 810                         continue;
 811
 812 #ifdef USE_ETHER_NTOHOST
 813                 /* Use yp/nis version of name if available */
 814                 if (ether_ntohost(name, (const struct ether_addr *)el->addr) == 0) {
 815                         tp->e_name = strdup(name);
 816                         continue;
 817                 }
 818 #endif
 819                 tp->e_name = el->name;
 820         }
 821 }
 822
 823 static struct tok llcsap_db[] = {
 824         { LLCSAP_NULL,          "null" },
 825         { LLCSAP_8021B_I,       "802.1b-gsap" },
 826         { LLCSAP_8021B_G,       "802.1b-isap" },
 827         { LLCSAP_IP,            "ip-sap" },
 828         { LLCSAP_PROWAYNM,      "proway-nm" },
 829         { LLCSAP_8021D,         "802.1d" },
 830         { LLCSAP_RS511,         "eia-rs511" },
 831         { LLCSAP_ISO8208,       "x.25/llc2" },
 832         { LLCSAP_PROWAY,        "proway" },
 833         { LLCSAP_SNAP,          "snap" },
 834         { LLCSAP_IPX,           "IPX" },
 835         { LLCSAP_NETBEUI,       "netbeui" },
 836         { LLCSAP_ISONS,         "iso-clns" },
 837         { LLCSAP_GLOBAL,        "global" },
 838         { 0,                    NULL }
 839 };
 840
 841 static void
 842 init_llcsaparray(void)
 843 {
 844         register int i;
 845         register struct hnamemem *table;
 846
 847         for (i = 0; llcsap_db[i].s != NULL; i++) {
 848                 table = &llcsaptable[llcsap_db[i].v];
 849                 while (table->name)
 850                         table = table->nxt;
 851                 table->name = llcsap_db[i].s;
 852                 table->addr = llcsap_db[i].v;
 853                 table->nxt = newhnamemem();
 854         }
 855 }
 856
 857 static struct tok ipxsap_db[] = {
 858         { 0x0000, "Unknown" },
 859         { 0x0001, "User" },
 860         { 0x0002, "User Group" },
 861         { 0x0003, "PrintQueue" },
 862         { 0x0004, "FileServer" },
 863         { 0x0005, "JobServer" },
 864         { 0x0006, "Gateway" },
 865         { 0x0007, "PrintServer" },
 866         { 0x0008, "ArchiveQueue" },
 867         { 0x0009, "ArchiveServer" },
 868         { 0x000a, "JobQueue" },
 869         { 0x000b, "Administration" },
 870         { 0x000F, "Novell TI-RPC" },
 871         { 0x0017, "Diagnostics" },
 872         { 0x0020, "NetBIOS" },
 873         { 0x0021, "NAS SNA Gateway" },
 874         { 0x0023, "NACS AsyncGateway" },
 875         { 0x0024, "RemoteBridge/RoutingService" },
 876         { 0x0026, "BridgeServer" },
 877         { 0x0027, "TCP/IP Gateway" },
 878         { 0x0028, "Point-to-point X.25 BridgeServer" },
 879         { 0x0029, "3270 Gateway" },
 880         { 0x002a, "CHI Corp" },
 881         { 0x002c, "PC Chalkboard" },
 882         { 0x002d, "TimeSynchServer" },
 883         { 0x002e, "ARCserve5.0/PalindromeBackup" },
 884         { 0x0045, "DI3270 Gateway" },
 885         { 0x0047, "AdvertisingPrintServer" },
 886         { 0x004a, "NetBlazerModems" },
 887         { 0x004b, "BtrieveVAP" },
 888         { 0x004c, "NetwareSQL" },
 889         { 0x004d, "XtreeNetwork" },
 890         { 0x0050, "BtrieveVAP4.11" },
 891         { 0x0052, "QuickLink" },
 892         { 0x0053, "PrintQueueUser" },
 893         { 0x0058, "Multipoint X.25 Router" },
 894         { 0x0060, "STLB/NLM" },
 895         { 0x0064, "ARCserve" },
 896         { 0x0066, "ARCserve3.0" },
 897         { 0x0072, "WAN CopyUtility" },
 898         { 0x007a, "TES-NetwareVMS" },
 899         { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" },
 900         { 0x0095, "DDA OBGYN" },
 901         { 0x0098, "NetwareAccessServer" },
 902         { 0x009a, "Netware for VMS II/NamedPipeServer" },
 903         { 0x009b, "NetwareAccessServer" },
 904         { 0x009e, "PortableNetwareServer/SunLinkNVT" },
 905         { 0x00a1, "PowerchuteAPC UPS" },
 906         { 0x00aa, "LAWserve" },
 907         { 0x00ac, "CompaqIDA StatusMonitor" },
 908         { 0x0100, "PIPE STAIL" },
 909         { 0x0102, "LAN ProtectBindery" },
 910         { 0x0103, "OracleDataBaseServer" },
 911         { 0x0107, "Netware386/RSPX RemoteConsole" },
 912         { 0x010f, "NovellSNA Gateway" },
 913         { 0x0111, "TestServer" },
 914         { 0x0112, "HP PrintServer" },
 915         { 0x0114, "CSA MUX" },
 916         { 0x0115, "CSA LCA" },
 917         { 0x0116, "CSA CM" },
 918         { 0x0117, "CSA SMA" },
 919         { 0x0118, "CSA DBA" },
 920         { 0x0119, "CSA NMA" },
 921         { 0x011a, "CSA SSA" },
 922         { 0x011b, "CSA STATUS" },
 923         { 0x011e, "CSA APPC" },
 924         { 0x0126, "SNA TEST SSA Profile" },
 925         { 0x012a, "CSA TRACE" },
 926         { 0x012b, "NetwareSAA" },
 927         { 0x012e, "IKARUS VirusScan" },
 928         { 0x0130, "CommunicationsExecutive" },
 929         { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" },
 930         { 0x0135, "NetwareNamingServicesProfile" },
 931         { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" },
 932         { 0x0141, "LAN SpoolServer" },
 933         { 0x0152, "IRMALAN Gateway" },
 934         { 0x0154, "NamedPipeServer" },
 935         { 0x0166, "NetWareManagement" },
 936         { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" },
 937         { 0x0173, "Compaq" },
 938         { 0x0174, "Compaq SNMP Agent" },
 939         { 0x0175, "Compaq" },
 940         { 0x0180, "XTreeServer/XTreeTools" },
 941         { 0x018A, "NASI ServicesBroadcastServer" },
 942         { 0x01b0, "GARP Gateway" },
 943         { 0x01b1, "Binfview" },
 944         { 0x01bf, "IntelLanDeskManager" },
 945         { 0x01ca, "AXTEC" },
 946         { 0x01cb, "ShivaNetModem/E" },
 947         { 0x01cc, "ShivaLanRover/E" },
 948         { 0x01cd, "ShivaLanRover/T" },
 949         { 0x01ce, "ShivaUniversal" },
 950         { 0x01d8, "CastelleFAXPressServer" },
 951         { 0x01da, "CastelleLANPressPrintServer" },
 952         { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" },
 953         { 0x01f0, "LEGATO" },
 954         { 0x01f5, "LEGATO" },
 955         { 0x0233, "NMS Agent/NetwareManagementAgent" },
 956         { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" },
 957         { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" },
 958         { 0x023a, "LANtern" },
 959         { 0x023c, "MAVERICK" },
 960         { 0x023f, "NovellSMDR" },
 961         { 0x024e, "NetwareConnect" },
 962         { 0x024f, "NASI ServerBroadcast Cisco" },
 963         { 0x026a, "NMS ServiceConsole" },
 964         { 0x026b, "TimeSynchronizationServer Netware 4.x" },
 965         { 0x0278, "DirectoryServer Netware 4.x" },
 966         { 0x027b, "NetwareManagementAgent" },
 967         { 0x0280, "Novell File and Printer Sharing Service for PC" },
 968         { 0x0304, "NovellSAA Gateway" },
 969         { 0x0308, "COM/VERMED" },
 970         { 0x030a, "GalacticommWorldgroupServer" },
 971         { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" },
 972         { 0x0320, "AttachmateGateway" },
 973         { 0x0327, "MicrosoftDiagnostiocs" },
 974         { 0x0328, "WATCOM SQL Server" },
 975         { 0x0335, "MultiTechSystems MultisynchCommServer" },
 976         { 0x0343, "Xylogics RemoteAccessServer/LANModem" },
 977         { 0x0355, "ArcadaBackupExec" },
 978         { 0x0358, "MSLCD1" },
 979         { 0x0361, "NETINELO" },
 980         { 0x037e, "Powerchute UPS Monitoring" },
 981         { 0x037f, "ViruSafeNotify" },
 982         { 0x0386, "HP Bridge" },
 983         { 0x0387, "HP Hub" },
 984         { 0x0394, "NetWare SAA Gateway" },
 985         { 0x039b, "LotusNotes" },
 986         { 0x03b7, "CertusAntiVirus" },
 987         { 0x03c4, "ARCserve4.0" },
 988         { 0x03c7, "LANspool3.5" },
 989         { 0x03d7, "LexmarkPrinterServer" },
 990         { 0x03d8, "LexmarkXLE PrinterServer" },
 991         { 0x03dd, "BanyanENS NetwareClient" },
 992         { 0x03de, "GuptaSequelBaseServer/NetWareSQL" },
 993         { 0x03e1, "UnivelUnixware" },
 994         { 0x03e4, "UnivelUnixware" },
 995         { 0x03fc, "IntelNetport" },
 996         { 0x03fd, "PrintServerQueue" },
 997         { 0x040A, "ipnServer" },
 998         { 0x040D, "LVERRMAN" },
 999         { 0x040E, "LVLIC" },
1000         { 0x0414, "NET Silicon (DPI)/Kyocera" },
1001         { 0x0429, "SiteLockVirus" },
1002         { 0x0432, "UFHELPR???" },
1003         { 0x0433, "Synoptics281xAdvancedSNMPAgent" },
1004         { 0x0444, "MicrosoftNT SNA Server" },
1005         { 0x0448, "Oracle" },
1006         { 0x044c, "ARCserve5.01" },
1007         { 0x0457, "CanonGP55" },
1008         { 0x045a, "QMS Printers" },
1009         { 0x045b, "DellSCSI Array" },
1010         { 0x0491, "NetBlazerModems" },
1011         { 0x04ac, "OnTimeScheduler" },
1012         { 0x04b0, "CD-Net" },
1013         { 0x0513, "EmulexNQA" },
1014         { 0x0520, "SiteLockChecks" },
1015         { 0x0529, "SiteLockChecks" },
1016         { 0x052d, "CitrixOS2 AppServer" },
1017         { 0x0535, "Tektronix" },
1018         { 0x0536, "Milan" },
1019         { 0x055d, "Attachmate SNA gateway" },
1020         { 0x056b, "IBM8235 ModemServer" },
1021         { 0x056c, "ShivaLanRover/E PLUS" },
1022         { 0x056d, "ShivaLanRover/T PLUS" },
1023         { 0x0580, "McAfeeNetShield" },
1024         { 0x05B8, "NLM to workstation communication (Revelation Software)" },
1025         { 0x05BA, "CompatibleSystemsRouters" },
1026         { 0x05BE, "CheyenneHierarchicalStorageManager" },
1027         { 0x0606, "JCWatermarkImaging" },
1028         { 0x060c, "AXISNetworkPrinter" },
1029         { 0x0610, "AdaptecSCSIManagement" },
1030         { 0x0621, "IBM AntiVirus" },
1031         { 0x0640, "Windows95 RemoteRegistryService" },
1032         { 0x064e, "MicrosoftIIS" },
1033         { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1034         { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1035         { 0x076C, "Xerox" },
1036         { 0x079b, "ShivaLanRover/E 115" },
1037         { 0x079c, "ShivaLanRover/T 115" },
1038         { 0x07B4, "CubixWorldDesk" },
1039         { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" },
1040         { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" },
1041         { 0x0810, "ELAN License Server Demo" },
1042         { 0x0824, "ShivaLanRoverAccessSwitch/E" },
1043         { 0x086a, "ISSC Collector" },
1044         { 0x087f, "ISSC DAS AgentAIX" },
1045         { 0x0880, "Intel Netport PRO" },
1046         { 0x0881, "Intel Netport PRO" },
1047         { 0x0b29, "SiteLock" },
1048         { 0x0c29, "SiteLockApplications" },
1049         { 0x0c2c, "LicensingServer" },
1050         { 0x2101, "PerformanceTechnologyInstantInternet" },
1051         { 0x2380, "LAI SiteLock" },
1052         { 0x238c, "MeetingMaker" },
1053         { 0x4808, "SiteLockServer/SiteLockMetering" },
1054         { 0x5555, "SiteLockUser" },
1055         { 0x6312, "Tapeware" },
1056         { 0x6f00, "RabbitGateway" },
1057         { 0x7703, "MODEM" },
1058         { 0x8002, "NetPortPrinters" },
1059         { 0x8008, "WordPerfectNetworkVersion" },
1060         { 0x85BE, "Cisco EIGRP" },
1061         { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" },
1062         { 0x9000, "McAfeeNetShield" },
1063         { 0x9604, "CSA-NT_MON" },
1064         { 0xb6a8, "OceanIsleReachoutRemoteControl" },
1065         { 0xf11f, "SiteLockMetering" },
1066         { 0xf1ff, "SiteLock" },
1067         { 0xf503, "Microsoft SQL Server" },
1068         { 0xF905, "IBM TimeAndPlace" },
1069         { 0xfbfb, "TopCallIII FaxServer" },
1070         { 0xffff, "AnyService/Wildcard" },
1071         { 0, (char *)0 }
1072 };
1073
1074 static void
1075 init_ipxsaparray(void)
1076 {
1077         register int i;
1078         register struct hnamemem *table;
1079
1080         for (i = 0; ipxsap_db[i].s != NULL; i++) {
1081                 int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1);
1082                 table = &ipxsaptable[j];
1083                 while (table->name)
1084                         table = table->nxt;
1085                 table->name = ipxsap_db[i].s;
1086                 table->addr = htons(ipxsap_db[i].v);
1087                 table->nxt = newhnamemem();
1088         }
1089 }
1090
1091 /*
1092  * Initialize the address to name translation machinery.  We map all
1093  * non-local IP addresses to numeric addresses if fflag is true (i.e.,
1094  * to prevent blocking on the nameserver).  localnet is the IP address
1095  * of the local network.  mask is its subnet mask.
1096  */
1097 void
1098 init_addrtoname(u_int32_t localnet, u_int32_t mask)
1099 {
1100         netmask = mask;
1101         if (fflag) {
1102                 f_localnet = localnet;
1103                 f_netmask = mask;
1104         }
1105         if (nflag)
1106                 /*
1107                  * Simplest way to suppress names.
1108                  */
1109                 return;
1110
1111         init_etherarray();
1112         init_servarray();
1113         init_eprotoarray();
1114         init_llcsaparray();
1115         init_protoidarray();
1116         init_ipxsaparray();
1117 }
1118
1119 const char *
1120 dnaddr_string(u_short dnaddr)
1121 {
1122         register struct hnamemem *tp;
1123
1124         for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != 0;
1125              tp = tp->nxt)
1126                 if (tp->addr == dnaddr)
1127                         return (tp->name);
1128
1129         tp->addr = dnaddr;
1130         tp->nxt = newhnamemem();
1131         if (nflag)
1132                 tp->name = dnnum_string(dnaddr);
1133         else
1134                 tp->name = dnname_string(dnaddr);
1135
1136         return(tp->name);
1137 }
1138
1139 /* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */
1140 struct hnamemem *
1141 newhnamemem(void)
1142 {
1143         register struct hnamemem *p;
1144         static struct hnamemem *ptr = NULL;
1145         static u_int num = 0;
1146
1147         if (num  <= 0) {
1148                 num = 64;
1149                 ptr = (struct hnamemem *)calloc(num, sizeof (*ptr));
1150                 if (ptr == NULL)
1151                         error("newhnamemem: calloc");
1152         }
1153         --num;
1154         p = ptr++;
1155         return (p);
1156 }
1157
1158 #ifdef INET6
1159 /* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */
1160 struct h6namemem *
1161 newh6namemem(void)
1162 {
1163         register struct h6namemem *p;
1164         static struct h6namemem *ptr = NULL;
1165         static u_int num = 0;
1166
1167         if (num  <= 0) {
1168                 num = 64;
1169                 ptr = (struct h6namemem *)calloc(num, sizeof (*ptr));
1170                 if (ptr == NULL)
1171                         error("newh6namemem: calloc");
1172         }
1173         --num;
1174         p = ptr++;
1175         return (p);
1176 }
1177 #endif /* INET6 */