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
  25 #ifdef HAVE_CONFIG_H
  26 #include "config.h"
  27 #endif
  28
  29 #include <tcpdump-stdinc.h>
  30
  31 #ifdef USE_ETHER_NTOHOST
  32 #ifdef HAVE_NETINET_IF_ETHER_H
  33 struct mbuf;            /* Squelch compiler warnings on some platforms for */
  34 struct rtentry;         /* declarations in <net/if.h> */
  35 #include <net/if.h>     /* for "struct ifnet" in "struct arpcom" on Solaris */
  36 #include <netinet/if_ether.h>
  37 #endif /* HAVE_NETINET_IF_ETHER_H */
  38 #ifdef NETINET_ETHER_H_DECLARES_ETHER_NTOHOST
  39 #include <netinet/ether.h>
  40 #endif /* NETINET_ETHER_H_DECLARES_ETHER_NTOHOST */
  41
  42 #if !defined(HAVE_DECL_ETHER_NTOHOST) || !HAVE_DECL_ETHER_NTOHOST
  43 #ifndef HAVE_STRUCT_ETHER_ADDR
  44 struct ether_addr {
  45         unsigned char ether_addr_octet[6];
  46 };
  47 #endif
  48 extern int ether_ntohost(char *, const struct ether_addr *);
  49 #endif
  50
  51 #endif /* USE_ETHER_NTOHOST */
  52
  53 #include <pcap.h>
  54 #include <pcap-namedb.h>
  55 #include <signal.h>
  56 #include <stdio.h>
  57 #include <string.h>
  58 #include <stdlib.h>
  59
  60 #include "interface.h"
  61 #include "addrtoname.h"
  62 #include "llc.h"
  63 #include "setsignal.h"
  64 #include "extract.h"
  65 #include "oui.h"
  66
  67 #ifndef ETHER_ADDR_LEN
  68 #define ETHER_ADDR_LEN  6
  69 #endif
  70
  71 /*
  72  * hash tables for whatever-to-name translations
  73  *
  74  * XXX there has to be error checks against strdup(3) failure
  75  */
  76
  77 #define HASHNAMESIZE 4096
  78
  79 struct hnamemem {
  80         uint32_t addr;
  81         const char *name;
  82         struct hnamemem *nxt;
  83 };
  84
  85 static struct hnamemem hnametable[HASHNAMESIZE];
  86 static struct hnamemem tporttable[HASHNAMESIZE];
  87 static struct hnamemem uporttable[HASHNAMESIZE];
  88 static struct hnamemem eprototable[HASHNAMESIZE];
  89 static struct hnamemem dnaddrtable[HASHNAMESIZE];
  90 static struct hnamemem ipxsaptable[HASHNAMESIZE];
  91
  92 #if defined(INET6) && defined(WIN32)
  93 /*
  94  * fake gethostbyaddr for Win2k/XP
  95  * gethostbyaddr() returns incorrect value when AF_INET6 is passed
  96  * to 3rd argument.
  97  *
  98  * h_name in struct hostent is only valid.
  99  */
 100 static struct hostent *
 101 win32_gethostbyaddr(const char *addr, int len, int type)
 102 {
 103         static struct hostent host;
 104         static char hostbuf[NI_MAXHOST];
 105         char hname[NI_MAXHOST];
 106         struct sockaddr_in6 addr6;
 107
 108         host.h_name = hostbuf;
 109         switch (type) {
 110         case AF_INET:
 111                 return gethostbyaddr(addr, len, type);
 112                 break;
 113         case AF_INET6:
 114                 memset(&addr6, 0, sizeof(addr6));
 115                 addr6.sin6_family = AF_INET6;
 116                 memcpy(&addr6.sin6_addr, addr, len);
 117                 if (getnameinfo((struct sockaddr *)&addr6, sizeof(addr6),
 118                     hname, sizeof(hname), NULL, 0, 0)) {
 119                         return NULL;
 120                 } else {
 121                         strcpy(host.h_name, hname);
 122                         return &host;
 123                 }
 124                 break;
 125         default:
 126                 return NULL;
 127         }
 128 }
 129 #define gethostbyaddr win32_gethostbyaddr
 130 #endif /* INET6 & WIN32 */
 131
 132 #ifdef INET6
 133 struct h6namemem {
 134         struct in6_addr addr;
 135         char *name;
 136         struct h6namemem *nxt;
 137 };
 138
 139 static struct h6namemem h6nametable[HASHNAMESIZE];
 140 #endif /* INET6 */
 141
 142 struct enamemem {
 143         u_short e_addr0;
 144         u_short e_addr1;
 145         u_short e_addr2;
 146         const char *e_name;
 147         u_char *e_nsap;                 /* used only for nsaptable[] */
 148 #define e_bs e_nsap                     /* for bytestringtable */
 149         struct enamemem *e_nxt;
 150 };
 151
 152 static struct enamemem enametable[HASHNAMESIZE];
 153 static struct enamemem nsaptable[HASHNAMESIZE];
 154 static struct enamemem bytestringtable[HASHNAMESIZE];
 155
 156 struct protoidmem {
 157         uint32_t p_oui;
 158         u_short p_proto;
 159         const char *p_name;
 160         struct protoidmem *p_nxt;
 161 };
 162
 163 static struct protoidmem protoidtable[HASHNAMESIZE];
 164
 165 /*
 166  * A faster replacement for inet_ntoa().
 167  */
 168 const char *
 169 intoa(uint32_t addr)
 170 {
 171         register char *cp;
 172         register u_int byte;
 173         register int n;
 174         static char buf[sizeof(".xxx.xxx.xxx.xxx")];
 175
 176         NTOHL(addr);
 177         cp = buf + sizeof(buf);
 178         *--cp = '\0';
 179
 180         n = 4;
 181         do {
 182                 byte = addr & 0xff;
 183                 *--cp = byte % 10 + '0';
 184                 byte /= 10;
 185                 if (byte > 0) {
 186                         *--cp = byte % 10 + '0';
 187                         byte /= 10;
 188                         if (byte > 0)
 189                                 *--cp = byte + '0';
 190                 }
 191                 *--cp = '.';
 192                 addr >>= 8;
 193         } while (--n > 0);
 194
 195         return cp + 1;
 196 }
 197
 198 static uint32_t f_netmask;
 199 static uint32_t f_localnet;
 200
 201 /*
 202  * Return a name for the IP address pointed to by ap.  This address
 203  * is assumed to be in network byte order.
 204  *
 205  * NOTE: ap is *NOT* necessarily part of the packet data (not even if
 206  * this is being called with the "ipaddr_string()" macro), so you
 207  * *CANNOT* use the ND_TCHECK{2}/ND_TTEST{2} macros on it.  Furthermore,
 208  * even in cases where it *is* part of the packet data, the caller
 209  * would still have to check for a null return value, even if it's
 210  * just printing the return value with "%s" - not all versions of
 211  * printf print "(null)" with "%s" and a null pointer, some of them
 212  * don't check for a null pointer and crash in that case.
 213  *
 214  * The callers of this routine should, before handing this routine
 215  * a pointer to packet data, be sure that the data is present in
 216  * the packet buffer.  They should probably do those checks anyway,
 217  * as other data at that layer might not be IP addresses, and it
 218  * also needs to check whether they're present in the packet buffer.
 219  */
 220 const char *
 221 getname(netdissect_options *ndo, const u_char *ap)
 222 {
 223         register struct hostent *hp;
 224         uint32_t addr;
 225         static struct hnamemem *p;              /* static for longjmp() */
 226
 227         memcpy(&addr, ap, sizeof(addr));
 228         p = &hnametable[addr & (HASHNAMESIZE-1)];
 229         for (; p->nxt; p = p->nxt) {
 230                 if (p->addr == addr)
 231                         return (p->name);
 232         }
 233         p->addr = addr;
 234         p->nxt = newhnamemem();
 235
 236         /*
 237          * Print names unless:
 238          *      (1) -n was given.
 239          *      (2) Address is foreign and -f was given. (If -f was not
 240          *          given, f_netmask and f_localnet are 0 and the test
 241          *          evaluates to true)
 242          */
 243         if (!ndo->ndo_nflag &&
 244             (addr & f_netmask) == f_localnet) {
 245                 hp = gethostbyaddr((char *)&addr, 4, AF_INET);
 246                 if (hp) {
 247                         char *dotp;
 248
 249                         p->name = strdup(hp->h_name);
 250                         if (ndo->ndo_Nflag) {
 251                                 /* Remove domain qualifications */
 252                                 dotp = strchr(p->name, '.');
 253                                 if (dotp)
 254                                         *dotp = '\0';
 255                         }
 256                         return (p->name);
 257                 }
 258         }
 259         p->name = strdup(intoa(addr));
 260         return (p->name);
 261 }
 262
 263 #ifdef INET6
 264 /*
 265  * Return a name for the IP6 address pointed to by ap.  This address
 266  * is assumed to be in network byte order.
 267  */
 268 const char *
 269 getname6(netdissect_options *ndo, const u_char *ap)
 270 {
 271         register struct hostent *hp;
 272         union {
 273                 struct in6_addr addr;
 274                 struct for_hash_addr {
 275                         char fill[14];
 276                         uint16_t d;
 277                 } addra;
 278         } addr;
 279         static struct h6namemem *p;             /* static for longjmp() */
 280         register const char *cp;
 281         char ntop_buf[INET6_ADDRSTRLEN];
 282
 283         memcpy(&addr, ap, sizeof(addr));
 284         p = &h6nametable[addr.addra.d & (HASHNAMESIZE-1)];
 285         for (; p->nxt; p = p->nxt) {
 286                 if (memcmp(&p->addr, &addr, sizeof(addr)) == 0)
 287                         return (p->name);
 288         }
 289         p->addr = addr.addr;
 290         p->nxt = newh6namemem();
 291
 292         /*
 293          * Do not print names if -n was given.
 294          */
 295         if (!ndo->ndo_nflag) {
 296                 hp = gethostbyaddr((char *)&addr, sizeof(addr), AF_INET6);
 297                 if (hp) {
 298                         char *dotp;
 299
 300                         p->name = strdup(hp->h_name);
 301                         if (ndo->ndo_Nflag) {
 302                                 /* Remove domain qualifications */
 303                                 dotp = strchr(p->name, '.');
 304                                 if (dotp)
 305                                         *dotp = '\0';
 306                         }
 307                         return (p->name);
 308                 }
 309         }
 310         cp = inet_ntop(AF_INET6, &addr, ntop_buf, sizeof(ntop_buf));
 311         p->name = strdup(cp);
 312         return (p->name);
 313 }
 314 #endif /* INET6 */
 315
 316 static const char hex[] = "0123456789abcdef";
 317
 318
 319 /* Find the hash node that corresponds the ether address 'ep' */
 320
 321 static inline struct enamemem *
 322 lookup_emem(const u_char *ep)
 323 {
 324         register u_int i, j, k;
 325         struct enamemem *tp;
 326
 327         k = (ep[0] << 8) | ep[1];
 328         j = (ep[2] << 8) | ep[3];
 329         i = (ep[4] << 8) | ep[5];
 330
 331         tp = &enametable[(i ^ j) & (HASHNAMESIZE-1)];
 332         while (tp->e_nxt)
 333                 if (tp->e_addr0 == i &&
 334                     tp->e_addr1 == j &&
 335                     tp->e_addr2 == k)
 336                         return tp;
 337                 else
 338                         tp = tp->e_nxt;
 339         tp->e_addr0 = i;
 340         tp->e_addr1 = j;
 341         tp->e_addr2 = k;
 342         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 343         if (tp->e_nxt == NULL)
 344                 error("lookup_emem: calloc");
 345
 346         return tp;
 347 }
 348
 349 /*
 350  * Find the hash node that corresponds to the bytestring 'bs'
 351  * with length 'nlen'
 352  */
 353
 354 static inline struct enamemem *
 355 lookup_bytestring(register const u_char *bs, const unsigned int nlen)
 356 {
 357         struct enamemem *tp;
 358         register u_int i, j, k;
 359
 360         if (nlen >= 6) {
 361                 k = (bs[0] << 8) | bs[1];
 362                 j = (bs[2] << 8) | bs[3];
 363                 i = (bs[4] << 8) | bs[5];
 364         } else if (nlen >= 4) {
 365                 k = (bs[0] << 8) | bs[1];
 366                 j = (bs[2] << 8) | bs[3];
 367                 i = 0;
 368         } else
 369                 i = j = k = 0;
 370
 371         tp = &bytestringtable[(i ^ j) & (HASHNAMESIZE-1)];
 372         while (tp->e_nxt)
 373                 if (tp->e_addr0 == i &&
 374                     tp->e_addr1 == j &&
 375                     tp->e_addr2 == k &&
 376                     memcmp((const char *)bs, (const char *)(tp->e_bs), nlen) == 0)
 377                         return tp;
 378                 else
 379                         tp = tp->e_nxt;
 380
 381         tp->e_addr0 = i;
 382         tp->e_addr1 = j;
 383         tp->e_addr2 = k;
 384
 385         tp->e_bs = (u_char *) calloc(1, nlen + 1);
 386         if (tp->e_bs == NULL)
 387                 error("lookup_bytestring: calloc");
 388
 389         memcpy(tp->e_bs, bs, nlen);
 390         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 391         if (tp->e_nxt == NULL)
 392                 error("lookup_bytestring: calloc");
 393
 394         return tp;
 395 }
 396
 397 /* Find the hash node that corresponds the NSAP 'nsap' */
 398
 399 static inline struct enamemem *
 400 lookup_nsap(register const u_char *nsap)
 401 {
 402         register u_int i, j, k;
 403         unsigned int nlen = *nsap;
 404         struct enamemem *tp;
 405         const u_char *ensap = nsap + nlen - 6;
 406
 407         if (nlen > 6) {
 408                 k = (ensap[0] << 8) | ensap[1];
 409                 j = (ensap[2] << 8) | ensap[3];
 410                 i = (ensap[4] << 8) | ensap[5];
 411         }
 412         else
 413                 i = j = k = 0;
 414
 415         tp = &nsaptable[(i ^ j) & (HASHNAMESIZE-1)];
 416         while (tp->e_nxt)
 417                 if (tp->e_addr0 == i &&
 418                     tp->e_addr1 == j &&
 419                     tp->e_addr2 == k &&
 420                     tp->e_nsap[0] == nlen &&
 421                     memcmp((const char *)&(nsap[1]),
 422                         (char *)&(tp->e_nsap[1]), nlen) == 0)
 423                         return tp;
 424                 else
 425                         tp = tp->e_nxt;
 426         tp->e_addr0 = i;
 427         tp->e_addr1 = j;
 428         tp->e_addr2 = k;
 429         tp->e_nsap = (u_char *)malloc(nlen + 1);
 430         if (tp->e_nsap == NULL)
 431                 error("lookup_nsap: malloc");
 432         memcpy((char *)tp->e_nsap, (const char *)nsap, nlen + 1);
 433         tp->e_nxt = (struct enamemem *)calloc(1, sizeof(*tp));
 434         if (tp->e_nxt == NULL)
 435                 error("lookup_nsap: calloc");
 436
 437         return tp;
 438 }
 439
 440 /* Find the hash node that corresponds the protoid 'pi'. */
 441
 442 static inline struct protoidmem *
 443 lookup_protoid(const u_char *pi)
 444 {
 445         register u_int i, j;
 446         struct protoidmem *tp;
 447
 448         /* 5 octets won't be aligned */
 449         i = (((pi[0] << 8) + pi[1]) << 8) + pi[2];
 450         j =   (pi[3] << 8) + pi[4];
 451         /* XXX should be endian-insensitive, but do big-endian testing  XXX */
 452
 453         tp = &protoidtable[(i ^ j) & (HASHNAMESIZE-1)];
 454         while (tp->p_nxt)
 455                 if (tp->p_oui == i && tp->p_proto == j)
 456                         return tp;
 457                 else
 458                         tp = tp->p_nxt;
 459         tp->p_oui = i;
 460         tp->p_proto = j;
 461         tp->p_nxt = (struct protoidmem *)calloc(1, sizeof(*tp));
 462         if (tp->p_nxt == NULL)
 463                 error("lookup_protoid: calloc");
 464
 465         return tp;
 466 }
 467
 468 const char *
 469 etheraddr_string(netdissect_options *ndo, register const u_char *ep)
 470 {
 471         register int i;
 472         register char *cp;
 473         register struct enamemem *tp;
 474         int oui;
 475         char buf[BUFSIZE];
 476
 477         tp = lookup_emem(ep);
 478         if (tp->e_name)
 479                 return (tp->e_name);
 480 #ifdef USE_ETHER_NTOHOST
 481         if (!ndo->ndo_nflag) {
 482                 char buf2[BUFSIZE];
 483
 484                 if (ether_ntohost(buf2, (const struct ether_addr *)ep) == 0) {
 485                         tp->e_name = strdup(buf2);
 486                         return (tp->e_name);
 487                 }
 488         }
 489 #endif
 490         cp = buf;
 491         oui = EXTRACT_24BITS(ep);
 492         *cp++ = hex[*ep >> 4 ];
 493         *cp++ = hex[*ep++ & 0xf];
 494         for (i = 5; --i >= 0;) {
 495                 *cp++ = ':';
 496                 *cp++ = hex[*ep >> 4 ];
 497                 *cp++ = hex[*ep++ & 0xf];
 498         }
 499
 500         if (!ndo->ndo_nflag) {
 501                 snprintf(cp, BUFSIZE - (2 + 5*3), " (oui %s)",
 502                     tok2str(oui_values, "Unknown", oui));
 503         } else
 504                 *cp = '\0';
 505         tp->e_name = strdup(buf);
 506         return (tp->e_name);
 507 }
 508
 509 const char *
 510 le64addr_string(const u_char *ep)
 511 {
 512         const unsigned int len = 8;
 513         register u_int i;
 514         register char *cp;
 515         register struct enamemem *tp;
 516         char buf[BUFSIZE];
 517
 518         tp = lookup_bytestring(ep, len);
 519         if (tp->e_name)
 520                 return (tp->e_name);
 521
 522         cp = buf;
 523         for (i = len; i > 0 ; --i) {
 524                 *cp++ = hex[*(ep + i - 1) >> 4];
 525                 *cp++ = hex[*(ep + i - 1) & 0xf];
 526                 *cp++ = ':';
 527         }
 528         cp --;
 529
 530         *cp = '\0';
 531
 532         tp->e_name = strdup(buf);
 533
 534         return (tp->e_name);
 535 }
 536
 537 const char *
 538 linkaddr_string(netdissect_options *ndo, const u_char *ep, const unsigned int type, const unsigned int len)
 539 {
 540         register u_int i;
 541         register char *cp;
 542         register struct enamemem *tp;
 543
 544         if (len == 0)
 545                 return ("<empty>");
 546
 547         if (type == LINKADDR_ETHER && len == ETHER_ADDR_LEN)
 548                 return (etheraddr_string(ndo, ep));
 549
 550         if (type == LINKADDR_FRELAY)
 551                 return (q922_string(ndo, ep, len));
 552
 553         tp = lookup_bytestring(ep, len);
 554         if (tp->e_name)
 555                 return (tp->e_name);
 556
 557         tp->e_name = cp = (char *)malloc(len*3);
 558         if (tp->e_name == NULL)
 559                 error("linkaddr_string: malloc");
 560         *cp++ = hex[*ep >> 4];
 561         *cp++ = hex[*ep++ & 0xf];
 562         for (i = len-1; i > 0 ; --i) {
 563                 *cp++ = ':';
 564                 *cp++ = hex[*ep >> 4];
 565                 *cp++ = hex[*ep++ & 0xf];
 566         }
 567         *cp = '\0';
 568         return (tp->e_name);
 569 }
 570
 571 const char *
 572 etherproto_string(u_short port)
 573 {
 574         register char *cp;
 575         register struct hnamemem *tp;
 576         register uint32_t i = port;
 577         char buf[sizeof("0000")];
 578
 579         for (tp = &eprototable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 580                 if (tp->addr == i)
 581                         return (tp->name);
 582
 583         tp->addr = i;
 584         tp->nxt = newhnamemem();
 585
 586         cp = buf;
 587         NTOHS(port);
 588         *cp++ = hex[port >> 12 & 0xf];
 589         *cp++ = hex[port >> 8 & 0xf];
 590         *cp++ = hex[port >> 4 & 0xf];
 591         *cp++ = hex[port & 0xf];
 592         *cp++ = '\0';
 593         tp->name = strdup(buf);
 594         return (tp->name);
 595 }
 596
 597 const char *
 598 protoid_string(register const u_char *pi)
 599 {
 600         register u_int i, j;
 601         register char *cp;
 602         register struct protoidmem *tp;
 603         char buf[sizeof("00:00:00:00:00")];
 604
 605         tp = lookup_protoid(pi);
 606         if (tp->p_name)
 607                 return tp->p_name;
 608
 609         cp = buf;
 610         if ((j = *pi >> 4) != 0)
 611                 *cp++ = hex[j];
 612         *cp++ = hex[*pi++ & 0xf];
 613         for (i = 4; (int)--i >= 0;) {
 614                 *cp++ = ':';
 615                 if ((j = *pi >> 4) != 0)
 616                         *cp++ = hex[j];
 617                 *cp++ = hex[*pi++ & 0xf];
 618         }
 619         *cp = '\0';
 620         tp->p_name = strdup(buf);
 621         return (tp->p_name);
 622 }
 623
 624 #define ISONSAP_MAX_LENGTH 20
 625 const char *
 626 isonsap_string(const u_char *nsap, register u_int nsap_length)
 627 {
 628         register u_int nsap_idx;
 629         register char *cp;
 630         register struct enamemem *tp;
 631
 632         if (nsap_length < 1 || nsap_length > ISONSAP_MAX_LENGTH)
 633                 return ("isonsap_string: illegal length");
 634
 635         tp = lookup_nsap(nsap);
 636         if (tp->e_name)
 637                 return tp->e_name;
 638
 639         tp->e_name = cp = (char *)malloc(sizeof("xx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xxxx.xx"));
 640         if (cp == NULL)
 641                 error("isonsap_string: malloc");
 642
 643         for (nsap_idx = 0; nsap_idx < nsap_length; nsap_idx++) {
 644                 *cp++ = hex[*nsap >> 4];
 645                 *cp++ = hex[*nsap++ & 0xf];
 646                 if (((nsap_idx & 1) == 0) &&
 647                      (nsap_idx + 1 < nsap_length)) {
 648                         *cp++ = '.';
 649                 }
 650         }
 651         *cp = '\0';
 652         return (tp->e_name);
 653 }
 654
 655 const char *
 656 tcpport_string(u_short port)
 657 {
 658         register struct hnamemem *tp;
 659         register uint32_t i = port;
 660         char buf[sizeof("00000")];
 661
 662         for (tp = &tporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 663                 if (tp->addr == i)
 664                         return (tp->name);
 665
 666         tp->addr = i;
 667         tp->nxt = newhnamemem();
 668
 669         (void)snprintf(buf, sizeof(buf), "%u", i);
 670         tp->name = strdup(buf);
 671         return (tp->name);
 672 }
 673
 674 const char *
 675 udpport_string(register u_short port)
 676 {
 677         register struct hnamemem *tp;
 678         register uint32_t i = port;
 679         char buf[sizeof("00000")];
 680
 681         for (tp = &uporttable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 682                 if (tp->addr == i)
 683                         return (tp->name);
 684
 685         tp->addr = i;
 686         tp->nxt = newhnamemem();
 687
 688         (void)snprintf(buf, sizeof(buf), "%u", i);
 689         tp->name = strdup(buf);
 690         return (tp->name);
 691 }
 692
 693 const char *
 694 ipxsap_string(u_short port)
 695 {
 696         register char *cp;
 697         register struct hnamemem *tp;
 698         register uint32_t i = port;
 699         char buf[sizeof("0000")];
 700
 701         for (tp = &ipxsaptable[i & (HASHNAMESIZE-1)]; tp->nxt; tp = tp->nxt)
 702                 if (tp->addr == i)
 703                         return (tp->name);
 704
 705         tp->addr = i;
 706         tp->nxt = newhnamemem();
 707
 708         cp = buf;
 709         NTOHS(port);
 710         *cp++ = hex[port >> 12 & 0xf];
 711         *cp++ = hex[port >> 8 & 0xf];
 712         *cp++ = hex[port >> 4 & 0xf];
 713         *cp++ = hex[port & 0xf];
 714         *cp++ = '\0';
 715         tp->name = strdup(buf);
 716         return (tp->name);
 717 }
 718
 719 static void
 720 init_servarray(netdissect_options *ndo)
 721 {
 722         struct servent *sv;
 723         register struct hnamemem *table;
 724         register int i;
 725         char buf[sizeof("0000000000")];
 726
 727         while ((sv = getservent()) != NULL) {
 728                 int port = ntohs(sv->s_port);
 729                 i = port & (HASHNAMESIZE-1);
 730                 if (strcmp(sv->s_proto, "tcp") == 0)
 731                         table = &tporttable[i];
 732                 else if (strcmp(sv->s_proto, "udp") == 0)
 733                         table = &uporttable[i];
 734                 else
 735                         continue;
 736
 737                 while (table->name)
 738                         table = table->nxt;
 739                 if (ndo->ndo_nflag) {
 740                         (void)snprintf(buf, sizeof(buf), "%d", port);
 741                         table->name = strdup(buf);
 742                 } else
 743                         table->name = strdup(sv->s_name);
 744                 table->addr = port;
 745                 table->nxt = newhnamemem();
 746         }
 747         endservent();
 748 }
 749
 750 /* in libpcap.a (nametoaddr.c) */
 751 #if defined(WIN32) && !defined(USE_STATIC_LIBPCAP)
 752 extern __declspec(dllimport)
 753 #else
 754 extern
 755 #endif
 756 const struct eproto {
 757         const char *s;
 758         u_short p;
 759 } eproto_db[];
 760
 761 static void
 762 init_eprotoarray(void)
 763 {
 764         register int i;
 765         register struct hnamemem *table;
 766
 767         for (i = 0; eproto_db[i].s; i++) {
 768                 int j = htons(eproto_db[i].p) & (HASHNAMESIZE-1);
 769                 table = &eprototable[j];
 770                 while (table->name)
 771                         table = table->nxt;
 772                 table->name = eproto_db[i].s;
 773                 table->addr = htons(eproto_db[i].p);
 774                 table->nxt = newhnamemem();
 775         }
 776 }
 777
 778 static const struct protoidlist {
 779         const u_char protoid[5];
 780         const char *name;
 781 } protoidlist[] = {
 782         {{ 0x00, 0x00, 0x0c, 0x01, 0x07 }, "CiscoMLS" },
 783         {{ 0x00, 0x00, 0x0c, 0x20, 0x00 }, "CiscoCDP" },
 784         {{ 0x00, 0x00, 0x0c, 0x20, 0x01 }, "CiscoCGMP" },
 785         {{ 0x00, 0x00, 0x0c, 0x20, 0x03 }, "CiscoVTP" },
 786         {{ 0x00, 0xe0, 0x2b, 0x00, 0xbb }, "ExtremeEDP" },
 787         {{ 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 788 };
 789
 790 /*
 791  * SNAP proto IDs with org code 0:0:0 are actually encapsulated Ethernet
 792  * types.
 793  */
 794 static void
 795 init_protoidarray(void)
 796 {
 797         register int i;
 798         register struct protoidmem *tp;
 799         const struct protoidlist *pl;
 800         u_char protoid[5];
 801
 802         protoid[0] = 0;
 803         protoid[1] = 0;
 804         protoid[2] = 0;
 805         for (i = 0; eproto_db[i].s; i++) {
 806                 u_short etype = htons(eproto_db[i].p);
 807
 808                 memcpy((char *)&protoid[3], (char *)&etype, 2);
 809                 tp = lookup_protoid(protoid);
 810                 tp->p_name = strdup(eproto_db[i].s);
 811         }
 812         /* Hardwire some SNAP proto ID names */
 813         for (pl = protoidlist; pl->name != NULL; ++pl) {
 814                 tp = lookup_protoid(pl->protoid);
 815                 /* Don't override existing name */
 816                 if (tp->p_name != NULL)
 817                         continue;
 818
 819                 tp->p_name = pl->name;
 820         }
 821 }
 822
 823 static const struct etherlist {
 824         const u_char addr[6];
 825         const char *name;
 826 } etherlist[] = {
 827         {{ 0xff, 0xff, 0xff, 0xff, 0xff, 0xff }, "Broadcast" },
 828         {{ 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 }, NULL }
 829 };
 830
 831 /*
 832  * Initialize the ethers hash table.  We take two different approaches
 833  * depending on whether or not the system provides the ethers name
 834  * service.  If it does, we just wire in a few names at startup,
 835  * and etheraddr_string() fills in the table on demand.  If it doesn't,
 836  * then we suck in the entire /etc/ethers file at startup.  The idea
 837  * is that parsing the local file will be fast, but spinning through
 838  * all the ethers entries via NIS & next_etherent might be very slow.
 839  *
 840  * XXX pcap_next_etherent doesn't belong in the pcap interface, but
 841  * since the pcap module already does name-to-address translation,
 842  * it's already does most of the work for the ethernet address-to-name
 843  * translation, so we just pcap_next_etherent as a convenience.
 844  */
 845 static void
 846 init_etherarray(void)
 847 {
 848         register const struct etherlist *el;
 849         register struct enamemem *tp;
 850 #ifdef USE_ETHER_NTOHOST
 851         char name[256];
 852 #else
 853         register struct pcap_etherent *ep;
 854         register FILE *fp;
 855
 856         /* Suck in entire ethers file */
 857         fp = fopen(PCAP_ETHERS_FILE, "r");
 858         if (fp != NULL) {
 859                 while ((ep = pcap_next_etherent(fp)) != NULL) {
 860                         tp = lookup_emem(ep->addr);
 861                         tp->e_name = strdup(ep->name);
 862                 }
 863                 (void)fclose(fp);
 864         }
 865 #endif
 866
 867         /* Hardwire some ethernet names */
 868         for (el = etherlist; el->name != NULL; ++el) {
 869                 tp = lookup_emem(el->addr);
 870                 /* Don't override existing name */
 871                 if (tp->e_name != NULL)
 872                         continue;
 873
 874 #ifdef USE_ETHER_NTOHOST
 875                 /*
 876                  * Use YP/NIS version of name if available.
 877                  */
 878                 if (ether_ntohost(name, (const struct ether_addr *)el->addr) == 0) {
 879                         tp->e_name = strdup(name);
 880                         continue;
 881                 }
 882 #endif
 883                 tp->e_name = el->name;
 884         }
 885 }
 886
 887 static const struct tok ipxsap_db[] = {
 888         { 0x0000, "Unknown" },
 889         { 0x0001, "User" },
 890         { 0x0002, "User Group" },
 891         { 0x0003, "PrintQueue" },
 892         { 0x0004, "FileServer" },
 893         { 0x0005, "JobServer" },
 894         { 0x0006, "Gateway" },
 895         { 0x0007, "PrintServer" },
 896         { 0x0008, "ArchiveQueue" },
 897         { 0x0009, "ArchiveServer" },
 898         { 0x000a, "JobQueue" },
 899         { 0x000b, "Administration" },
 900         { 0x000F, "Novell TI-RPC" },
 901         { 0x0017, "Diagnostics" },
 902         { 0x0020, "NetBIOS" },
 903         { 0x0021, "NAS SNA Gateway" },
 904         { 0x0023, "NACS AsyncGateway" },
 905         { 0x0024, "RemoteBridge/RoutingService" },
 906         { 0x0026, "BridgeServer" },
 907         { 0x0027, "TCP/IP Gateway" },
 908         { 0x0028, "Point-to-point X.25 BridgeServer" },
 909         { 0x0029, "3270 Gateway" },
 910         { 0x002a, "CHI Corp" },
 911         { 0x002c, "PC Chalkboard" },
 912         { 0x002d, "TimeSynchServer" },
 913         { 0x002e, "ARCserve5.0/PalindromeBackup" },
 914         { 0x0045, "DI3270 Gateway" },
 915         { 0x0047, "AdvertisingPrintServer" },
 916         { 0x004a, "NetBlazerModems" },
 917         { 0x004b, "BtrieveVAP" },
 918         { 0x004c, "NetwareSQL" },
 919         { 0x004d, "XtreeNetwork" },
 920         { 0x0050, "BtrieveVAP4.11" },
 921         { 0x0052, "QuickLink" },
 922         { 0x0053, "PrintQueueUser" },
 923         { 0x0058, "Multipoint X.25 Router" },
 924         { 0x0060, "STLB/NLM" },
 925         { 0x0064, "ARCserve" },
 926         { 0x0066, "ARCserve3.0" },
 927         { 0x0072, "WAN CopyUtility" },
 928         { 0x007a, "TES-NetwareVMS" },
 929         { 0x0092, "WATCOM Debugger/EmeraldTapeBackupServer" },
 930         { 0x0095, "DDA OBGYN" },
 931         { 0x0098, "NetwareAccessServer" },
 932         { 0x009a, "Netware for VMS II/NamedPipeServer" },
 933         { 0x009b, "NetwareAccessServer" },
 934         { 0x009e, "PortableNetwareServer/SunLinkNVT" },
 935         { 0x00a1, "PowerchuteAPC UPS" },
 936         { 0x00aa, "LAWserve" },
 937         { 0x00ac, "CompaqIDA StatusMonitor" },
 938         { 0x0100, "PIPE STAIL" },
 939         { 0x0102, "LAN ProtectBindery" },
 940         { 0x0103, "OracleDataBaseServer" },
 941         { 0x0107, "Netware386/RSPX RemoteConsole" },
 942         { 0x010f, "NovellSNA Gateway" },
 943         { 0x0111, "TestServer" },
 944         { 0x0112, "HP PrintServer" },
 945         { 0x0114, "CSA MUX" },
 946         { 0x0115, "CSA LCA" },
 947         { 0x0116, "CSA CM" },
 948         { 0x0117, "CSA SMA" },
 949         { 0x0118, "CSA DBA" },
 950         { 0x0119, "CSA NMA" },
 951         { 0x011a, "CSA SSA" },
 952         { 0x011b, "CSA STATUS" },
 953         { 0x011e, "CSA APPC" },
 954         { 0x0126, "SNA TEST SSA Profile" },
 955         { 0x012a, "CSA TRACE" },
 956         { 0x012b, "NetwareSAA" },
 957         { 0x012e, "IKARUS VirusScan" },
 958         { 0x0130, "CommunicationsExecutive" },
 959         { 0x0133, "NNS DomainServer/NetwareNamingServicesDomain" },
 960         { 0x0135, "NetwareNamingServicesProfile" },
 961         { 0x0137, "Netware386 PrintQueue/NNS PrintQueue" },
 962         { 0x0141, "LAN SpoolServer" },
 963         { 0x0152, "IRMALAN Gateway" },
 964         { 0x0154, "NamedPipeServer" },
 965         { 0x0166, "NetWareManagement" },
 966         { 0x0168, "Intel PICKIT CommServer/Intel CAS TalkServer" },
 967         { 0x0173, "Compaq" },
 968         { 0x0174, "Compaq SNMP Agent" },
 969         { 0x0175, "Compaq" },
 970         { 0x0180, "XTreeServer/XTreeTools" },
 971         { 0x018A, "NASI ServicesBroadcastServer" },
 972         { 0x01b0, "GARP Gateway" },
 973         { 0x01b1, "Binfview" },
 974         { 0x01bf, "IntelLanDeskManager" },
 975         { 0x01ca, "AXTEC" },
 976         { 0x01cb, "ShivaNetModem/E" },
 977         { 0x01cc, "ShivaLanRover/E" },
 978         { 0x01cd, "ShivaLanRover/T" },
 979         { 0x01ce, "ShivaUniversal" },
 980         { 0x01d8, "CastelleFAXPressServer" },
 981         { 0x01da, "CastelleLANPressPrintServer" },
 982         { 0x01dc, "CastelleFAX/Xerox7033 FaxServer/ExcelLanFax" },
 983         { 0x01f0, "LEGATO" },
 984         { 0x01f5, "LEGATO" },
 985         { 0x0233, "NMS Agent/NetwareManagementAgent" },
 986         { 0x0237, "NMS IPX Discovery/LANternReadWriteChannel" },
 987         { 0x0238, "NMS IP Discovery/LANternTrapAlarmChannel" },
 988         { 0x023a, "LANtern" },
 989         { 0x023c, "MAVERICK" },
 990         { 0x023f, "NovellSMDR" },
 991         { 0x024e, "NetwareConnect" },
 992         { 0x024f, "NASI ServerBroadcast Cisco" },
 993         { 0x026a, "NMS ServiceConsole" },
 994         { 0x026b, "TimeSynchronizationServer Netware 4.x" },
 995         { 0x0278, "DirectoryServer Netware 4.x" },
 996         { 0x027b, "NetwareManagementAgent" },
 997         { 0x0280, "Novell File and Printer Sharing Service for PC" },
 998         { 0x0304, "NovellSAA Gateway" },
 999         { 0x0308, "COM/VERMED" },
1000         { 0x030a, "GalacticommWorldgroupServer" },
1001         { 0x030c, "IntelNetport2/HP JetDirect/HP Quicksilver" },
1002         { 0x0320, "AttachmateGateway" },
1003         { 0x0327, "MicrosoftDiagnostiocs" },
1004         { 0x0328, "WATCOM SQL Server" },
1005         { 0x0335, "MultiTechSystems MultisynchCommServer" },
1006         { 0x0343, "Xylogics RemoteAccessServer/LANModem" },
1007         { 0x0355, "ArcadaBackupExec" },
1008         { 0x0358, "MSLCD1" },
1009         { 0x0361, "NETINELO" },
1010         { 0x037e, "Powerchute UPS Monitoring" },
1011         { 0x037f, "ViruSafeNotify" },
1012         { 0x0386, "HP Bridge" },
1013         { 0x0387, "HP Hub" },
1014         { 0x0394, "NetWare SAA Gateway" },
1015         { 0x039b, "LotusNotes" },
1016         { 0x03b7, "CertusAntiVirus" },
1017         { 0x03c4, "ARCserve4.0" },
1018         { 0x03c7, "LANspool3.5" },
1019         { 0x03d7, "LexmarkPrinterServer" },
1020         { 0x03d8, "LexmarkXLE PrinterServer" },
1021         { 0x03dd, "BanyanENS NetwareClient" },
1022         { 0x03de, "GuptaSequelBaseServer/NetWareSQL" },
1023         { 0x03e1, "UnivelUnixware" },
1024         { 0x03e4, "UnivelUnixware" },
1025         { 0x03fc, "IntelNetport" },
1026         { 0x03fd, "PrintServerQueue" },
1027         { 0x040A, "ipnServer" },
1028         { 0x040D, "LVERRMAN" },
1029         { 0x040E, "LVLIC" },
1030         { 0x0414, "NET Silicon (DPI)/Kyocera" },
1031         { 0x0429, "SiteLockVirus" },
1032         { 0x0432, "UFHELPR???" },
1033         { 0x0433, "Synoptics281xAdvancedSNMPAgent" },
1034         { 0x0444, "MicrosoftNT SNA Server" },
1035         { 0x0448, "Oracle" },
1036         { 0x044c, "ARCserve5.01" },
1037         { 0x0457, "CanonGP55" },
1038         { 0x045a, "QMS Printers" },
1039         { 0x045b, "DellSCSI Array" },
1040         { 0x0491, "NetBlazerModems" },
1041         { 0x04ac, "OnTimeScheduler" },
1042         { 0x04b0, "CD-Net" },
1043         { 0x0513, "EmulexNQA" },
1044         { 0x0520, "SiteLockChecks" },
1045         { 0x0529, "SiteLockChecks" },
1046         { 0x052d, "CitrixOS2 AppServer" },
1047         { 0x0535, "Tektronix" },
1048         { 0x0536, "Milan" },
1049         { 0x055d, "Attachmate SNA gateway" },
1050         { 0x056b, "IBM8235 ModemServer" },
1051         { 0x056c, "ShivaLanRover/E PLUS" },
1052         { 0x056d, "ShivaLanRover/T PLUS" },
1053         { 0x0580, "McAfeeNetShield" },
1054         { 0x05B8, "NLM to workstation communication (Revelation Software)" },
1055         { 0x05BA, "CompatibleSystemsRouters" },
1056         { 0x05BE, "CheyenneHierarchicalStorageManager" },
1057         { 0x0606, "JCWatermarkImaging" },
1058         { 0x060c, "AXISNetworkPrinter" },
1059         { 0x0610, "AdaptecSCSIManagement" },
1060         { 0x0621, "IBM AntiVirus" },
1061         { 0x0640, "Windows95 RemoteRegistryService" },
1062         { 0x064e, "MicrosoftIIS" },
1063         { 0x067b, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1064         { 0x067c, "Microsoft Win95/98 File and Print Sharing for NetWare" },
1065         { 0x076C, "Xerox" },
1066         { 0x079b, "ShivaLanRover/E 115" },
1067         { 0x079c, "ShivaLanRover/T 115" },
1068         { 0x07B4, "CubixWorldDesk" },
1069         { 0x07c2, "Quarterdeck IWare Connect V2.x NLM" },
1070         { 0x07c1, "Quarterdeck IWare Connect V3.x NLM" },
1071         { 0x0810, "ELAN License Server Demo" },
1072         { 0x0824, "ShivaLanRoverAccessSwitch/E" },
1073         { 0x086a, "ISSC Collector" },
1074         { 0x087f, "ISSC DAS AgentAIX" },
1075         { 0x0880, "Intel Netport PRO" },
1076         { 0x0881, "Intel Netport PRO" },
1077         { 0x0b29, "SiteLock" },
1078         { 0x0c29, "SiteLockApplications" },
1079         { 0x0c2c, "LicensingServer" },
1080         { 0x2101, "PerformanceTechnologyInstantInternet" },
1081         { 0x2380, "LAI SiteLock" },
1082         { 0x238c, "MeetingMaker" },
1083         { 0x4808, "SiteLockServer/SiteLockMetering" },
1084         { 0x5555, "SiteLockUser" },
1085         { 0x6312, "Tapeware" },
1086         { 0x6f00, "RabbitGateway" },
1087         { 0x7703, "MODEM" },
1088         { 0x8002, "NetPortPrinters" },
1089         { 0x8008, "WordPerfectNetworkVersion" },
1090         { 0x85BE, "Cisco EIGRP" },
1091         { 0x8888, "WordPerfectNetworkVersion/QuickNetworkManagement" },
1092         { 0x9000, "McAfeeNetShield" },
1093         { 0x9604, "CSA-NT_MON" },
1094         { 0xb6a8, "OceanIsleReachoutRemoteControl" },
1095         { 0xf11f, "SiteLockMetering" },
1096         { 0xf1ff, "SiteLock" },
1097         { 0xf503, "Microsoft SQL Server" },
1098         { 0xF905, "IBM TimeAndPlace" },
1099         { 0xfbfb, "TopCallIII FaxServer" },
1100         { 0xffff, "AnyService/Wildcard" },
1101         { 0, (char *)0 }
1102 };
1103
1104 static void
1105 init_ipxsaparray(void)
1106 {
1107         register int i;
1108         register struct hnamemem *table;
1109
1110         for (i = 0; ipxsap_db[i].s != NULL; i++) {
1111                 int j = htons(ipxsap_db[i].v) & (HASHNAMESIZE-1);
1112                 table = &ipxsaptable[j];
1113                 while (table->name)
1114                         table = table->nxt;
1115                 table->name = ipxsap_db[i].s;
1116                 table->addr = htons(ipxsap_db[i].v);
1117                 table->nxt = newhnamemem();
1118         }
1119 }
1120
1121 /*
1122  * Initialize the address to name translation machinery.  We map all
1123  * non-local IP addresses to numeric addresses if ndo->ndo_fflag is true
1124  * (i.e., to prevent blocking on the nameserver).  localnet is the IP address
1125  * of the local network.  mask is its subnet mask.
1126  */
1127 void
1128 init_addrtoname(netdissect_options *ndo, uint32_t localnet, uint32_t mask)
1129 {
1130         if (ndo->ndo_fflag) {
1131                 f_localnet = localnet;
1132                 f_netmask = mask;
1133         }
1134         if (ndo->ndo_nflag)
1135                 /*
1136                  * Simplest way to suppress names.
1137                  */
1138                 return;
1139
1140         init_etherarray();
1141         init_servarray(ndo);
1142         init_eprotoarray();
1143         init_protoidarray();
1144         init_ipxsaparray();
1145 }
1146
1147 const char *
1148 dnaddr_string(netdissect_options *ndo, u_short dnaddr)
1149 {
1150         register struct hnamemem *tp;
1151
1152         for (tp = &dnaddrtable[dnaddr & (HASHNAMESIZE-1)]; tp->nxt != 0;
1153              tp = tp->nxt)
1154                 if (tp->addr == dnaddr)
1155                         return (tp->name);
1156
1157         tp->addr = dnaddr;
1158         tp->nxt = newhnamemem();
1159         if (ndo->ndo_nflag)
1160                 tp->name = dnnum_string(dnaddr);
1161         else
1162                 tp->name = dnname_string(dnaddr);
1163
1164         return(tp->name);
1165 }
1166
1167 /* Return a zero'ed hnamemem struct and cuts down on calloc() overhead */
1168 struct hnamemem *
1169 newhnamemem(void)
1170 {
1171         register struct hnamemem *p;
1172         static struct hnamemem *ptr = NULL;
1173         static u_int num = 0;
1174
1175         if (num  <= 0) {
1176                 num = 64;
1177                 ptr = (struct hnamemem *)calloc(num, sizeof (*ptr));
1178                 if (ptr == NULL)
1179                         error("newhnamemem: calloc");
1180         }
1181         --num;
1182         p = ptr++;
1183         return (p);
1184 }
1185
1186 #ifdef INET6
1187 /* Return a zero'ed h6namemem struct and cuts down on calloc() overhead */
1188 struct h6namemem *
1189 newh6namemem(void)
1190 {
1191         register struct h6namemem *p;
1192         static struct h6namemem *ptr = NULL;
1193         static u_int num = 0;
1194
1195         if (num  <= 0) {
1196                 num = 64;
1197                 ptr = (struct h6namemem *)calloc(num, sizeof (*ptr));
1198                 if (ptr == NULL)
1199                         error("newh6namemem: calloc");
1200         }
1201         --num;
1202         p = ptr++;
1203         return (p);
1204 }
1205 #endif /* INET6 */
1206
1207 /* Represent TCI part of the 802.1Q 4-octet tag as text. */
1208 const char *
1209 ieee8021q_tci_string(const uint16_t tci)
1210 {
1211         static char buf[128];
1212         snprintf(buf, sizeof(buf), "vlan %u, p %u%s",
1213                  tci & 0xfff,
1214                  tci >> 13,
1215                  (tci & 0x1000) ? ", DEI" : "");
1216         return buf;
1217 }