The Tcpdump Group git mirrors - libpcap/blob - 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
 251                 if (*proto != save_proto)
 252                         *proto = PROTO_UNDEF;
 253         } else {
 254                 *port1 = p1;
 255                 *port2 = p2;
 256                 *proto = PROTO_UNDEF;
 257         }
 258
 259         return 1;
 260 }
 261
 262 int
 263 pcap_nametoproto(const char *str)
 264 {
 265         struct protoent *p;
 266
 267         p = getprotobyname(str);
 268         if (p != 0)
 269                 return p->p_proto;
 270         else
 271                 return PROTO_UNDEF;
 272 }
 273
 274 #include "ethertype.h"
 275
 276 struct eproto {
 277         const char *s;
 278         u_short p;
 279 };
 280
 281 /* Static data base of ether protocol types. */
 282 struct eproto eproto_db[] = {
 283         { "pup", ETHERTYPE_PUP },
 284         { "xns", ETHERTYPE_NS },
 285         { "ip", ETHERTYPE_IP },
 286 #ifdef INET6
 287         { "ip6", ETHERTYPE_IPV6 },
 288 #endif
 289         { "arp", ETHERTYPE_ARP },
 290         { "rarp", ETHERTYPE_REVARP },
 291         { "sprite", ETHERTYPE_SPRITE },
 292         { "mopdl", ETHERTYPE_MOPDL },
 293         { "moprc", ETHERTYPE_MOPRC },
 294         { "decnet", ETHERTYPE_DN },
 295         { "lat", ETHERTYPE_LAT },
 296         { "sca", ETHERTYPE_SCA },
 297         { "lanbridge", ETHERTYPE_LANBRIDGE },
 298         { "vexp", ETHERTYPE_VEXP },
 299         { "vprod", ETHERTYPE_VPROD },
 300         { "atalk", ETHERTYPE_ATALK },
 301         { "atalkarp", ETHERTYPE_AARP },
 302         { "loopback", ETHERTYPE_LOOPBACK },
 303         { "decdts", ETHERTYPE_DECDTS },
 304         { "decdns", ETHERTYPE_DECDNS },
 305         { (char *)0, 0 }
 306 };
 307
 308 int
 309 pcap_nametoeproto(const char *s)
 310 {
 311         struct eproto *p = eproto_db;
 312
 313         while (p->s != 0) {
 314                 if (strcmp(p->s, s) == 0)
 315                         return p->p;
 316                 p += 1;
 317         }
 318         return PROTO_UNDEF;
 319 }
 320
 321 #include "llc.h"
 322
 323 /* Static data base of LLC values. */
 324 static struct eproto llc_db[] = {
 325         { "iso", LLCSAP_ISONS },
 326         { "stp", LLCSAP_8021D },
 327         { "ipx", LLCSAP_IPX },
 328         { "netbeui", LLCSAP_NETBEUI },
 329         { (char *)0, 0 }
 330 };
 331
 332 int
 333 pcap_nametollc(const char *s)
 334 {
 335         struct eproto *p = llc_db;
 336
 337         while (p->s != 0) {
 338                 if (strcmp(p->s, s) == 0)
 339                         return p->p;
 340                 p += 1;
 341         }
 342         return PROTO_UNDEF;
 343 }
 344
 345 /* Hex digit to integer. */
 346 static inline int
 347 xdtoi(c)
 348         register int c;
 349 {
 350         if (isdigit(c))
 351                 return c - '0';
 352         else if (islower(c))
 353                 return c - 'a' + 10;
 354         else
 355                 return c - 'A' + 10;
 356 }
 357
 358 int
 359 __pcap_atoin(const char *s, bpf_u_int32 *addr)
 360 {
 361         u_int n;
 362         int len;
 363
 364         *addr = 0;
 365         len = 0;
 366         while (1) {
 367                 n = 0;
 368                 while (*s && *s != '.')
 369                         n = n * 10 + *s++ - '0';
 370                 *addr <<= 8;
 371                 *addr |= n & 0xff;
 372                 len += 8;
 373                 if (*s == '\0')
 374                         return len;
 375                 ++s;
 376         }
 377         /* NOTREACHED */
 378 }
 379
 380 int
 381 __pcap_atodn(const char *s, bpf_u_int32 *addr)
 382 {
 383 #define AREASHIFT 10
 384 #define AREAMASK 0176000
 385 #define NODEMASK 01777
 386
 387         u_int node, area;
 388
 389         if (sscanf(s, "%d.%d", &area, &node) != 2)
 390                 bpf_error("malformed decnet address '%s'", s);
 391
 392         *addr = (area << AREASHIFT) & AREAMASK;
 393         *addr |= (node & NODEMASK);
 394
 395         return(32);
 396 }
 397
 398 /*
 399  * Convert 's', which can have the one of the forms:
 400  *
 401  *      "xx:xx:xx:xx:xx:xx"
 402  *      "xx.xx.xx.xx.xx.xx"
 403  *      "xx-xx-xx-xx-xx-xx"
 404  *      "xxxx.xxxx.xxxx"
 405  *      "xxxxxxxxxxxx"
 406  *
 407  * (or various mixes of ':', '.', and '-') into a new
 408  * ethernet address.  Assumes 's' is well formed.
 409  */
 410 u_char *
 411 pcap_ether_aton(const char *s)
 412 {
 413         register u_char *ep, *e;
 414         register u_int d;
 415
 416         e = ep = (u_char *)malloc(6);
 417
 418         while (*s) {
 419                 if (*s == ':' || *s == '.' || *s == '-')
 420                         s += 1;
 421                 d = xdtoi(*s++);
 422                 if (isxdigit((unsigned char)*s)) {
 423                         d <<= 4;
 424                         d |= xdtoi(*s++);
 425                 }
 426                 *ep++ = d;
 427         }
 428
 429         return (e);
 430 }
 431
 432 #ifndef HAVE_ETHER_HOSTTON
 433 /* Roll our own */
 434 u_char *
 435 pcap_ether_hostton(const char *name)
 436 {
 437         register struct pcap_etherent *ep;
 438         register u_char *ap;
 439         static FILE *fp = NULL;
 440         static int init = 0;
 441
 442         if (!init) {
 443                 fp = fopen(PCAP_ETHERS_FILE, "r");
 444                 ++init;
 445                 if (fp == NULL)
 446                         return (NULL);
 447         } else if (fp == NULL)
 448                 return (NULL);
 449         else
 450                 rewind(fp);
 451
 452         while ((ep = pcap_next_etherent(fp)) != NULL) {
 453                 if (strcmp(ep->name, name) == 0) {
 454                         ap = (u_char *)malloc(6);
 455                         if (ap != NULL) {
 456                                 memcpy(ap, ep->addr, 6);
 457                                 return (ap);
 458                         }
 459                         break;
 460                 }
 461         }
 462         return (NULL);
 463 }
 464 #else
 465
 466 #if !defined(HAVE_DECL_ETHER_HOSTTON) || !HAVE_DECL_ETHER_HOSTTON
 467 #ifndef HAVE_STRUCT_ETHER_ADDR
 468 struct ether_addr {
 469         unsigned char ether_addr_octet[6];
 470 };
 471 #endif
 472 extern int ether_hostton(const char *, struct ether_addr *);
 473 #endif
 474
 475 /* Use the os supplied routines */
 476 u_char *
 477 pcap_ether_hostton(const char *name)
 478 {
 479         register u_char *ap;
 480         u_char a[6];
 481
 482         ap = NULL;
 483         if (ether_hostton(name, (struct ether_addr *)a) == 0) {
 484                 ap = (u_char *)malloc(6);
 485                 if (ap != NULL)
 486                         memcpy((char *)ap, (char *)a, 6);
 487         }
 488         return (ap);
 489 }
 490 #endif
 491
 492 u_short
 493 __pcap_nametodnaddr(const char *name)
 494 {
 495 #ifdef  DECNETLIB
 496         struct nodeent *getnodebyname();
 497         struct nodeent *nep;
 498         unsigned short res;
 499
 500         nep = getnodebyname(name);
 501         if (nep == ((struct nodeent *)0))
 502                 bpf_error("unknown decnet host name '%s'\n", name);
 503
 504         memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short));
 505         return(res);
 506 #else
 507         bpf_error("decnet name support not included, '%s' cannot be translated\n",
 508                 name);
 509         return(0);
 510 #endif
 511 }