contrib/libpcap/nametoaddr.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998
   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  * Name to id translation routines used by the scanner.
  22  * These functions are not time critical.
  23  */
  24
  25 #ifndef lint
  26 static const char rcsid[] _U_ =
  27     "@(#) $Header: /tcpdump/master/libpcap/nametoaddr.c,v 1.83 2008-02-06 10:21:30 guy Exp $ (LBL)";
  28 #endif
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #ifdef DECNETLIB
  35 #include <sys/types.h>
  36 #include <netdnet/dnetdb.h>
  37 #endif
  38
  39 #ifdef WIN32
  40 #include <pcap-stdinc.h>
  41
  42 #else /* WIN32 */
  43
  44 #include <sys/param.h>
  45 #include <sys/types.h>                          /* concession to AIX */
  46 #include <sys/socket.h>
  47 #include <sys/time.h>
  48
  49 #include <netinet/in.h>
  50 #endif /* WIN32 */
  51
  52 #ifndef WIN32
  53 #ifdef HAVE_ETHER_HOSTTON
  54 /*
  55  * XXX - do we need any of this if <netinet/if_ether.h> doesn't declare
  56  * ether_hostton()?
  57  */
  58 #ifdef HAVE_NETINET_IF_ETHER_H
  59 struct mbuf;            /* Squelch compiler warnings on some platforms for */
  60 struct rtentry;         /* declarations in <net/if.h> */
  61 #include <net/if.h>     /* for "struct ifnet" in "struct arpcom" on Solaris */
  62 #include <netinet/if_ether.h>
  63 #endif /* HAVE_NETINET_IF_ETHER_H */
  64 #ifdef NETINET_ETHER_H_DECLARES_ETHER_HOSTTON
  65 #include <netinet/ether.h>
  66 #endif /* NETINET_ETHER_H_DECLARES_ETHER_HOSTTON */
  67 #endif /* HAVE_ETHER_HOSTTON */
  68 #include <arpa/inet.h>
  69 #include <netdb.h>
  70 #endif /* WIN32 */
  71
  72 #include <ctype.h>
  73 #include <errno.h>
  74 #include <stdlib.h>
  75 #include <string.h>
  76 #include <stdio.h>
  77
  78 #include "pcap-int.h"
  79
  80 #include "gencode.h"
  81 #include <pcap/namedb.h>
  82
  83 #ifdef HAVE_OS_PROTO_H
  84 #include "os-proto.h"
  85 #endif
  86
  87 #ifndef NTOHL
  88 #define NTOHL(x) (x) = ntohl(x)
  89 #define NTOHS(x) (x) = ntohs(x)
  90 #endif
  91
  92 static inline int xdtoi(int);
  93
  94 /*
  95  *  Convert host name to internet address.
  96  *  Return 0 upon failure.
  97  */
  98 bpf_u_int32 **
  99 pcap_nametoaddr(const char *name)
 100 {
 101 #ifndef h_addr
 102         static bpf_u_int32 *hlist[2];
 103 #endif
 104         bpf_u_int32 **p;
 105         struct hostent *hp;
 106
 107         if ((hp = gethostbyname(name)) != NULL) {
 108 #ifndef h_addr
 109                 hlist[0] = (bpf_u_int32 *)hp->h_addr;
 110                 NTOHL(hp->h_addr);
 111                 return hlist;
 112 #else
 113                 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
 114                         NTOHL(**p);
 115                 return (bpf_u_int32 **)hp->h_addr_list;
 116 #endif
 117         }
 118         else
 119                 return 0;
 120 }
 121
 122 #ifdef INET6
 123 struct addrinfo *
 124 pcap_nametoaddrinfo(const char *name)
 125 {
 126         struct addrinfo hints, *res;
 127         int error;
 128
 129         memset(&hints, 0, sizeof(hints));
 130         hints.ai_family = PF_UNSPEC;
 131         hints.ai_socktype = SOCK_STREAM;        /*not really*/
 132         hints.ai_protocol = IPPROTO_TCP;        /*not really*/
 133         error = getaddrinfo(name, NULL, &hints, &res);
 134         if (error)
 135                 return NULL;
 136         else
 137                 return res;
 138 }
 139 #endif /*INET6*/
 140
 141 /*
 142  *  Convert net name to internet address.
 143  *  Return 0 upon failure.
 144  */
 145 bpf_u_int32
 146 pcap_nametonetaddr(const char *name)
 147 {
 148 #ifndef WIN32
 149         struct netent *np;
 150
 151         if ((np = getnetbyname(name)) != NULL)
 152                 return np->n_net;
 153         else
 154                 return 0;
 155 #else
 156         /*
 157          * There's no "getnetbyname()" on Windows.
 158          */
 159         return 0;
 160 #endif
 161 }
 162
 163 /*
 164  * Convert a port name to its port and protocol numbers.
 165  * We assume only TCP or UDP.
 166  * Return 0 upon failure.
 167  */
 168 int
 169 pcap_nametoport(const char *name, int *port, int *proto)
 170 {
 171         struct servent *sp;
 172         int tcp_port = -1;
 173         int udp_port = -1;
 174
 175         /*
 176          * We need to check /etc/services for ambiguous entries.
 177          * If we find the ambiguous entry, and it has the
 178          * same port number, change the proto to PROTO_UNDEF
 179          * so both TCP and UDP will be checked.
 180          */
 181         sp = getservbyname(name, "tcp");
 182         if (sp != NULL) tcp_port = ntohs(sp->s_port);
 183         sp = getservbyname(name, "udp");
 184         if (sp != NULL) udp_port = ntohs(sp->s_port);
 185         if (tcp_port >= 0) {
 186                 *port = tcp_port;
 187                 *proto = IPPROTO_TCP;
 188                 if (udp_port >= 0) {
 189                         if (udp_port == tcp_port)
 190                                 *proto = PROTO_UNDEF;
 191 #ifdef notdef
 192                         else
 193                                 /* Can't handle ambiguous names that refer
 194                                    to different port numbers. */
 195                                 warning("ambiguous port %s in /etc/services",
 196                                         name);
 197 #endif
 198                 }
 199                 return 1;
 200         }
 201         if (udp_port >= 0) {
 202                 *port = udp_port;
 203                 *proto = IPPROTO_UDP;
 204                 return 1;
 205         }
 206 #if defined(ultrix) || defined(__osf__)
 207         /* Special hack in case NFS isn't in /etc/services */
 208         if (strcmp(name, "nfs") == 0) {
 209                 *port = 2049;
 210                 *proto = PROTO_UNDEF;
 211                 return 1;
 212         }
 213 #endif
 214         return 0;
 215 }
 216
 217 /*
 218  * Convert a string in the form PPP-PPP, where correspond to ports, to
 219  * a starting and ending port in a port range.
 220  * Return 0 on failure.
 221  */
 222 int
 223 pcap_nametoportrange(const char *name, int *port1, int *port2, int *proto)
 224 {
 225         u_int p1, p2;
 226         char *off, *cpy;
 227         int save_proto;
 228
 229         if (sscanf(name, "%d-%d", &p1, &p2) != 2) {
 230                 if ((cpy = strdup(name)) == NULL)
 231                         return 0;
 232
 233                 if ((off = strchr(cpy, '-')) == NULL) {
 234                         free(cpy);
 235                         return 0;
 236                 }
 237
 238                 *off = '\0';
 239
 240                 if (pcap_nametoport(cpy, port1, proto) == 0) {
 241                         free(cpy);
 242                         return 0;
 243                 }
 244                 save_proto = *proto;
 245
 246                 if (pcap_nametoport(off + 1, port2, proto) == 0) {
 247                         free(cpy);
 248                         return 0;
 249                 }
 250                 free(cpy);
 251
 252                 if (*proto != save_proto)
 253                         *proto = PROTO_UNDEF;
 254         } else {
 255                 *port1 = p1;
 256                 *port2 = p2;
 257                 *proto = PROTO_UNDEF;
 258         }
 259
 260         return 1;
 261 }
 262
 263 int
 264 pcap_nametoproto(const char *str)
 265 {
 266         struct protoent *p;
 267
 268         p = getprotobyname(str);
 269         if (p != 0)
 270                 return p->p_proto;
 271         else
 272                 return PROTO_UNDEF;
 273 }
 274
 275 #include "ethertype.h"
 276
 277 struct eproto {
 278         const char *s;
 279         u_short p;
 280 };
 281
 282 /* Static data base of ether protocol types. */
 283 struct eproto eproto_db[] = {
 284         { "pup", ETHERTYPE_PUP },
 285         { "xns", ETHERTYPE_NS },
 286         { "ip", ETHERTYPE_IP },
 287 #ifdef INET6
 288         { "ip6", ETHERTYPE_IPV6 },
 289 #endif
 290         { "arp", ETHERTYPE_ARP },
 291         { "rarp", ETHERTYPE_REVARP },
 292         { "sprite", ETHERTYPE_SPRITE },
 293         { "mopdl", ETHERTYPE_MOPDL },
 294         { "moprc", ETHERTYPE_MOPRC },
 295         { "decnet", ETHERTYPE_DN },
 296         { "lat", ETHERTYPE_LAT },
 297         { "sca", ETHERTYPE_SCA },
 298         { "lanbridge", ETHERTYPE_LANBRIDGE },
 299         { "vexp", ETHERTYPE_VEXP },
 300         { "vprod", ETHERTYPE_VPROD },
 301         { "atalk", ETHERTYPE_ATALK },
 302         { "atalkarp", ETHERTYPE_AARP },
 303         { "loopback", ETHERTYPE_LOOPBACK },
 304         { "decdts", ETHERTYPE_DECDTS },
 305         { "decdns", ETHERTYPE_DECDNS },
 306         { (char *)0, 0 }
 307 };
 308
 309 int
 310 pcap_nametoeproto(const char *s)
 311 {
 312         struct eproto *p = eproto_db;
 313
 314         while (p->s != 0) {
 315                 if (strcmp(p->s, s) == 0)
 316                         return p->p;
 317                 p += 1;
 318         }
 319         return PROTO_UNDEF;
 320 }
 321
 322 #include "llc.h"
 323
 324 /* Static data base of LLC values. */
 325 static struct eproto llc_db[] = {
 326         { "iso", LLCSAP_ISONS },
 327         { "stp", LLCSAP_8021D },
 328         { "ipx", LLCSAP_IPX },
 329         { "netbeui", LLCSAP_NETBEUI },
 330         { (char *)0, 0 }
 331 };
 332
 333 int
 334 pcap_nametollc(const char *s)
 335 {
 336         struct eproto *p = llc_db;
 337
 338         while (p->s != 0) {
 339                 if (strcmp(p->s, s) == 0)
 340                         return p->p;
 341                 p += 1;
 342         }
 343         return PROTO_UNDEF;
 344 }
 345
 346 /* Hex digit to integer. */
 347 static inline int
 348 xdtoi(c)
 349         register int c;
 350 {
 351         if (isdigit(c))
 352                 return c - '0';
 353         else if (islower(c))
 354                 return c - 'a' + 10;
 355         else
 356                 return c - 'A' + 10;
 357 }
 358
 359 int
 360 __pcap_atoin(const char *s, bpf_u_int32 *addr)
 361 {
 362         u_int n;
 363         int len;
 364
 365         *addr = 0;
 366         len = 0;
 367         while (1) {
 368                 n = 0;
 369                 while (*s && *s != '.')
 370                         n = n * 10 + *s++ - '0';
 371                 *addr <<= 8;
 372                 *addr |= n & 0xff;
 373                 len += 8;
 374                 if (*s == '\0')
 375                         return len;
 376                 ++s;
 377         }
 378         /* NOTREACHED */
 379 }
 380
 381 int
 382 __pcap_atodn(const char *s, bpf_u_int32 *addr)
 383 {
 384 #define AREASHIFT 10
 385 #define AREAMASK 0176000
 386 #define NODEMASK 01777
 387
 388         u_int node, area;
 389
 390         if (sscanf(s, "%d.%d", &area, &node) != 2)
 391                 bpf_error("malformed decnet address '%s'", s);
 392
 393         *addr = (area << AREASHIFT) & AREAMASK;
 394         *addr |= (node & NODEMASK);
 395
 396         return(32);
 397 }
 398
 399 /*
 400  * Convert 's', which can have the one of the forms:
 401  *
 402  *      "xx:xx:xx:xx:xx:xx"
 403  *      "xx.xx.xx.xx.xx.xx"
 404  *      "xx-xx-xx-xx-xx-xx"
 405  *      "xxxx.xxxx.xxxx"
 406  *      "xxxxxxxxxxxx"
 407  *
 408  * (or various mixes of ':', '.', and '-') into a new
 409  * ethernet address.  Assumes 's' is well formed.
 410  */
 411 u_char *
 412 pcap_ether_aton(const char *s)
 413 {
 414         register u_char *ep, *e;
 415         register u_int d;
 416
 417         e = ep = (u_char *)malloc(6);
 418
 419         while (*s) {
 420                 if (*s == ':' || *s == '.' || *s == '-')
 421                         s += 1;
 422                 d = xdtoi(*s++);
 423                 if (isxdigit((unsigned char)*s)) {
 424                         d <<= 4;
 425                         d |= xdtoi(*s++);
 426                 }
 427                 *ep++ = d;
 428         }
 429
 430         return (e);
 431 }
 432
 433 #ifndef HAVE_ETHER_HOSTTON
 434 /* Roll our own */
 435 u_char *
 436 pcap_ether_hostton(const char *name)
 437 {
 438         register struct pcap_etherent *ep;
 439         register u_char *ap;
 440         static FILE *fp = NULL;
 441         static int init = 0;
 442
 443         if (!init) {
 444                 fp = fopen(PCAP_ETHERS_FILE, "r");
 445                 ++init;
 446                 if (fp == NULL)
 447                         return (NULL);
 448         } else if (fp == NULL)
 449                 return (NULL);
 450         else
 451                 rewind(fp);
 452
 453         while ((ep = pcap_next_etherent(fp)) != NULL) {
 454                 if (strcmp(ep->name, name) == 0) {
 455                         ap = (u_char *)malloc(6);
 456                         if (ap != NULL) {
 457                                 memcpy(ap, ep->addr, 6);
 458                                 return (ap);
 459                         }
 460                         break;
 461                 }
 462         }
 463         return (NULL);
 464 }
 465 #else
 466
 467 #if !defined(HAVE_DECL_ETHER_HOSTTON) || !HAVE_DECL_ETHER_HOSTTON
 468 #ifndef HAVE_STRUCT_ETHER_ADDR
 469 struct ether_addr {
 470         unsigned char ether_addr_octet[6];
 471 };
 472 #endif
 473 extern int ether_hostton(const char *, struct ether_addr *);
 474 #endif
 475
 476 /* Use the os supplied routines */
 477 u_char *
 478 pcap_ether_hostton(const char *name)
 479 {
 480         register u_char *ap;
 481         u_char a[6];
 482
 483         ap = NULL;
 484         if (ether_hostton(name, (struct ether_addr *)a) == 0) {
 485                 ap = (u_char *)malloc(6);
 486                 if (ap != NULL)
 487                         memcpy((char *)ap, (char *)a, 6);
 488         }
 489         return (ap);
 490 }
 491 #endif
 492
 493 u_short
 494 __pcap_nametodnaddr(const char *name)
 495 {
 496 #ifdef  DECNETLIB
 497         struct nodeent *getnodebyname();
 498         struct nodeent *nep;
 499         unsigned short res;
 500
 501         nep = getnodebyname(name);
 502         if (nep == ((struct nodeent *)0))
 503                 bpf_error("unknown decnet host name '%s'\n", name);
 504
 505         memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short));
 506         return(res);
 507 #else
 508         bpf_error("decnet name support not included, '%s' cannot be translated\n",
 509                 name);
 510         return(0);
 511 #endif
 512 }