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 1.82.2.1 2008/02/06 10:21:47 guy Exp $ (LBL)";
  28 #endif
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #ifdef WIN32
  35 #include <pcap-stdinc.h>
  36
  37 #else /* WIN32 */
  38
  39 #include <sys/param.h>
  40 #include <sys/types.h>                          /* concession to AIX */
  41 #include <sys/socket.h>
  42 #include <sys/time.h>
  43
  44 #include <netinet/in.h>
  45 #endif /* WIN32 */
  46
  47 /*
  48  * XXX - why was this included even on UNIX?
  49  */
  50 #ifdef __MINGW32__
  51 #include "IP6_misc.h"
  52 #endif
  53
  54 #ifndef WIN32
  55 #ifdef HAVE_ETHER_HOSTTON
  56 /*
  57  * XXX - do we need any of this if <netinet/if_ether.h> doesn't declare
  58  * ether_hostton()?
  59  */
  60 #ifdef HAVE_NETINET_IF_ETHER_H
  61 struct mbuf;            /* Squelch compiler warnings on some platforms for */
  62 struct rtentry;         /* declarations in <net/if.h> */
  63 #include <net/if.h>     /* for "struct ifnet" in "struct arpcom" on Solaris */
  64 #include <netinet/if_ether.h>
  65 #endif /* HAVE_NETINET_IF_ETHER_H */
  66 #ifdef NETINET_ETHER_H_DECLARES_ETHER_HOSTTON
  67 #include <netinet/ether.h>
  68 #endif /* NETINET_ETHER_H_DECLARES_ETHER_HOSTTON */
  69 #endif /* HAVE_ETHER_HOSTTON */
  70 #include <arpa/inet.h>
  71 #include <netdb.h>
  72 #endif /* WIN32 */
  73
  74 #include <ctype.h>
  75 #include <errno.h>
  76 #include <stdlib.h>
  77 #include <string.h>
  78 #include <stdio.h>
  79
  80 #include "pcap-int.h"
  81
  82 #include "gencode.h"
  83 #include <pcap/namedb.h>
  84
  85 #ifdef HAVE_OS_PROTO_H
  86 #include "os-proto.h"
  87 #endif
  88
  89 #ifndef NTOHL
  90 #define NTOHL(x) (x) = ntohl(x)
  91 #define NTOHS(x) (x) = ntohs(x)
  92 #endif
  93
  94 static inline int xdtoi(int);
  95
  96 /*
  97  *  Convert host name to internet address.
  98  *  Return 0 upon failure.
  99  */
 100 bpf_u_int32 **
 101 pcap_nametoaddr(const char *name)
 102 {
 103 #ifndef h_addr
 104         static bpf_u_int32 *hlist[2];
 105 #endif
 106         bpf_u_int32 **p;
 107         struct hostent *hp;
 108
 109         if ((hp = gethostbyname(name)) != NULL) {
 110 #ifndef h_addr
 111                 hlist[0] = (bpf_u_int32 *)hp->h_addr;
 112                 NTOHL(hp->h_addr);
 113                 return hlist;
 114 #else
 115                 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
 116                         NTOHL(**p);
 117                 return (bpf_u_int32 **)hp->h_addr_list;
 118 #endif
 119         }
 120         else
 121                 return 0;
 122 }
 123
 124 #ifdef INET6
 125 struct addrinfo *
 126 pcap_nametoaddrinfo(const char *name)
 127 {
 128         struct addrinfo hints, *res;
 129         int error;
 130
 131         memset(&hints, 0, sizeof(hints));
 132         hints.ai_family = PF_UNSPEC;
 133         hints.ai_socktype = SOCK_STREAM;        /*not really*/
 134         hints.ai_protocol = IPPROTO_TCP;        /*not really*/
 135         error = getaddrinfo(name, NULL, &hints, &res);
 136         if (error)
 137                 return NULL;
 138         else
 139                 return res;
 140 }
 141 #endif /*INET6*/
 142
 143 /*
 144  *  Convert net name to internet address.
 145  *  Return 0 upon failure.
 146  */
 147 bpf_u_int32
 148 pcap_nametonetaddr(const char *name)
 149 {
 150 #ifndef WIN32
 151         struct netent *np;
 152
 153         if ((np = getnetbyname(name)) != NULL)
 154                 return np->n_net;
 155         else
 156                 return 0;
 157 #else
 158         /*
 159          * There's no "getnetbyname()" on Windows.
 160          */
 161         return 0;
 162 #endif
 163 }
 164
 165 /*
 166  * Convert a port name to its port and protocol numbers.
 167  * We assume only TCP or UDP.
 168  * Return 0 upon failure.
 169  */
 170 int
 171 pcap_nametoport(const char *name, int *port, int *proto)
 172 {
 173         struct servent *sp;
 174         int tcp_port = -1;
 175         int udp_port = -1;
 176
 177         /*
 178          * We need to check /etc/services for ambiguous entries.
 179          * If we find the ambiguous entry, and it has the
 180          * same port number, change the proto to PROTO_UNDEF
 181          * so both TCP and UDP will be checked.
 182          */
 183         sp = getservbyname(name, "tcp");
 184         if (sp != NULL) tcp_port = ntohs(sp->s_port);
 185         sp = getservbyname(name, "udp");
 186         if (sp != NULL) udp_port = ntohs(sp->s_port);
 187         if (tcp_port >= 0) {
 188                 *port = tcp_port;
 189                 *proto = IPPROTO_TCP;
 190                 if (udp_port >= 0) {
 191                         if (udp_port == tcp_port)
 192                                 *proto = PROTO_UNDEF;
 193 #ifdef notdef
 194                         else
 195                                 /* Can't handle ambiguous names that refer
 196                                    to different port numbers. */
 197                                 warning("ambiguous port %s in /etc/services",
 198                                         name);
 199 #endif
 200                 }
 201                 return 1;
 202         }
 203         if (udp_port >= 0) {
 204                 *port = udp_port;
 205                 *proto = IPPROTO_UDP;
 206                 return 1;
 207         }
 208 #if defined(ultrix) || defined(__osf__)
 209         /* Special hack in case NFS isn't in /etc/services */
 210         if (strcmp(name, "nfs") == 0) {
 211                 *port = 2049;
 212                 *proto = PROTO_UNDEF;
 213                 return 1;
 214         }
 215 #endif
 216         return 0;
 217 }
 218
 219 /*
 220  * Convert a string in the form PPP-PPP, where correspond to ports, to
 221  * a starting and ending port in a port range.
 222  * Return 0 on failure.
 223  */
 224 int
 225 pcap_nametoportrange(const char *name, int *port1, int *port2, int *proto)
 226 {
 227         u_int p1, p2;
 228         char *off, *cpy;
 229         int save_proto;
 230
 231         if (sscanf(name, "%d-%d", &p1, &p2) != 2) {
 232                 if ((cpy = strdup(name)) == NULL)
 233                         return 0;
 234
 235                 if ((off = strchr(cpy, '-')) == NULL) {
 236                         free(cpy);
 237                         return 0;
 238                 }
 239
 240                 *off = '\0';
 241
 242                 if (pcap_nametoport(cpy, port1, proto) == 0) {
 243                         free(cpy);
 244                         return 0;
 245                 }
 246                 save_proto = *proto;
 247
 248                 if (pcap_nametoport(off + 1, port2, proto) == 0) {
 249                         free(cpy);
 250                         return 0;
 251                 }
 252
 253                 if (*proto != save_proto)
 254                         *proto = PROTO_UNDEF;
 255         } else {
 256                 *port1 = p1;
 257                 *port2 = p2;
 258                 *proto = PROTO_UNDEF;
 259         }
 260
 261         return 1;
 262 }
 263
 264 int
 265 pcap_nametoproto(const char *str)
 266 {
 267         struct protoent *p;
 268
 269         p = getprotobyname(str);
 270         if (p != 0)
 271                 return p->p_proto;
 272         else
 273                 return PROTO_UNDEF;
 274 }
 275
 276 #include "ethertype.h"
 277
 278 struct eproto {
 279         const char *s;
 280         u_short p;
 281 };
 282
 283 /* Static data base of ether protocol types. */
 284 struct eproto eproto_db[] = {
 285         { "pup", ETHERTYPE_PUP },
 286         { "xns", ETHERTYPE_NS },
 287         { "ip", ETHERTYPE_IP },
 288 #ifdef INET6
 289         { "ip6", ETHERTYPE_IPV6 },
 290 #endif
 291         { "arp", ETHERTYPE_ARP },
 292         { "rarp", ETHERTYPE_REVARP },
 293         { "sprite", ETHERTYPE_SPRITE },
 294         { "mopdl", ETHERTYPE_MOPDL },
 295         { "moprc", ETHERTYPE_MOPRC },
 296         { "decnet", ETHERTYPE_DN },
 297         { "lat", ETHERTYPE_LAT },
 298         { "sca", ETHERTYPE_SCA },
 299         { "lanbridge", ETHERTYPE_LANBRIDGE },
 300         { "vexp", ETHERTYPE_VEXP },
 301         { "vprod", ETHERTYPE_VPROD },
 302         { "atalk", ETHERTYPE_ATALK },
 303         { "atalkarp", ETHERTYPE_AARP },
 304         { "loopback", ETHERTYPE_LOOPBACK },
 305         { "decdts", ETHERTYPE_DECDTS },
 306         { "decdns", ETHERTYPE_DECDNS },
 307         { (char *)0, 0 }
 308 };
 309
 310 int
 311 pcap_nametoeproto(const char *s)
 312 {
 313         struct eproto *p = eproto_db;
 314
 315         while (p->s != 0) {
 316                 if (strcmp(p->s, s) == 0)
 317                         return p->p;
 318                 p += 1;
 319         }
 320         return PROTO_UNDEF;
 321 }
 322
 323 #include "llc.h"
 324
 325 /* Static data base of LLC values. */
 326 static struct eproto llc_db[] = {
 327         { "iso", LLCSAP_ISONS },
 328         { "stp", LLCSAP_8021D },
 329         { "ipx", LLCSAP_IPX },
 330         { "netbeui", LLCSAP_NETBEUI },
 331         { (char *)0, 0 }
 332 };
 333
 334 int
 335 pcap_nametollc(const char *s)
 336 {
 337         struct eproto *p = llc_db;
 338
 339         while (p->s != 0) {
 340                 if (strcmp(p->s, s) == 0)
 341                         return p->p;
 342                 p += 1;
 343         }
 344         return PROTO_UNDEF;
 345 }
 346
 347 /* Hex digit to integer. */
 348 static inline int
 349 xdtoi(c)
 350         register int c;
 351 {
 352         if (isdigit(c))
 353                 return c - '0';
 354         else if (islower(c))
 355                 return c - 'a' + 10;
 356         else
 357                 return c - 'A' + 10;
 358 }
 359
 360 int
 361 __pcap_atoin(const char *s, bpf_u_int32 *addr)
 362 {
 363         u_int n;
 364         int len;
 365
 366         *addr = 0;
 367         len = 0;
 368         while (1) {
 369                 n = 0;
 370                 while (*s && *s != '.')
 371                         n = n * 10 + *s++ - '0';
 372                 *addr <<= 8;
 373                 *addr |= n & 0xff;
 374                 len += 8;
 375                 if (*s == '\0')
 376                         return len;
 377                 ++s;
 378         }
 379         /* NOTREACHED */
 380 }
 381
 382 int
 383 __pcap_atodn(const char *s, bpf_u_int32 *addr)
 384 {
 385 #define AREASHIFT 10
 386 #define AREAMASK 0176000
 387 #define NODEMASK 01777
 388
 389         u_int node, area;
 390
 391         if (sscanf(s, "%d.%d", &area, &node) != 2)
 392                 bpf_error("malformed decnet address '%s'", s);
 393
 394         *addr = (area << AREASHIFT) & AREAMASK;
 395         *addr |= (node & NODEMASK);
 396
 397         return(32);
 398 }
 399
 400 /*
 401  * Convert 's', which can have the one of the forms:
 402  *
 403  *      "xx:xx:xx:xx:xx:xx"
 404  *      "xx.xx.xx.xx.xx.xx"
 405  *      "xx-xx-xx-xx-xx-xx"
 406  *      "xxxx.xxxx.xxxx"
 407  *      "xxxxxxxxxxxx"
 408  *
 409  * (or various mixes of ':', '.', and '-') into a new
 410  * ethernet address.  Assumes 's' is well formed.
 411  */
 412 u_char *
 413 pcap_ether_aton(const char *s)
 414 {
 415         register u_char *ep, *e;
 416         register u_int d;
 417
 418         e = ep = (u_char *)malloc(6);
 419
 420         while (*s) {
 421                 if (*s == ':' || *s == '.' || *s == '-')
 422                         s += 1;
 423                 d = xdtoi(*s++);
 424                 if (isxdigit((unsigned char)*s)) {
 425                         d <<= 4;
 426                         d |= xdtoi(*s++);
 427                 }
 428                 *ep++ = d;
 429         }
 430
 431         return (e);
 432 }
 433
 434 #ifndef HAVE_ETHER_HOSTTON
 435 /* Roll our own */
 436 u_char *
 437 pcap_ether_hostton(const char *name)
 438 {
 439         register struct pcap_etherent *ep;
 440         register u_char *ap;
 441         static FILE *fp = NULL;
 442         static int init = 0;
 443
 444         if (!init) {
 445                 fp = fopen(PCAP_ETHERS_FILE, "r");
 446                 ++init;
 447                 if (fp == NULL)
 448                         return (NULL);
 449         } else if (fp == NULL)
 450                 return (NULL);
 451         else
 452                 rewind(fp);
 453
 454         while ((ep = pcap_next_etherent(fp)) != NULL) {
 455                 if (strcmp(ep->name, name) == 0) {
 456                         ap = (u_char *)malloc(6);
 457                         if (ap != NULL) {
 458                                 memcpy(ap, ep->addr, 6);
 459                                 return (ap);
 460                         }
 461                         break;
 462                 }
 463         }
 464         return (NULL);
 465 }
 466 #else
 467
 468 #if !defined(HAVE_DECL_ETHER_HOSTTON) || !HAVE_DECL_ETHER_HOSTTON
 469 #ifndef HAVE_STRUCT_ETHER_ADDR
 470 struct ether_addr {
 471         unsigned char ether_addr_octet[6];
 472 };
 473 #endif
 474 extern int ether_hostton(const char *, struct ether_addr *);
 475 #endif
 476
 477 /* Use the os supplied routines */
 478 u_char *
 479 pcap_ether_hostton(const char *name)
 480 {
 481         register u_char *ap;
 482         u_char a[6];
 483
 484         ap = NULL;
 485         if (ether_hostton(name, (struct ether_addr *)a) == 0) {
 486                 ap = (u_char *)malloc(6);
 487                 if (ap != NULL)
 488                         memcpy((char *)ap, (char *)a, 6);
 489         }
 490         return (ap);
 491 }
 492 #endif
 493
 494 u_short
 495 __pcap_nametodnaddr(const char *name)
 496 {
 497 #ifdef  DECNETLIB
 498         struct nodeent *getnodebyname();
 499         struct nodeent *nep;
 500         unsigned short res;
 501
 502         nep = getnodebyname(name);
 503         if (nep == ((struct nodeent *)0))
 504                 bpf_error("unknown decnet host name '%s'\n", name);
 505
 506         memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short));
 507         return(res);
 508 #else
 509         bpf_error("decnet name support not included, '%s' cannot be translated\n",
 510                 name);
 511         return(0);
 512 #endif
 513 }