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 1.76 2005-03-27 02:45:03 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 #endif /* HAVE_ETHER_HOSTTON */
  67 #ifdef NETINET_ETHER_H_DECLARES_ETHER_HOSTON
  68 #include <netinet/ether.h>
  69 #endif /* NETINET_ETHER_H_DECLARES_ETHER_HOSTON */
  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 <memory.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 int
 220 pcap_nametoproto(const char *str)
 221 {
 222         struct protoent *p;
 223
 224         p = getprotobyname(str);
 225         if (p != 0)
 226                 return p->p_proto;
 227         else
 228                 return PROTO_UNDEF;
 229 }
 230
 231 #include "ethertype.h"
 232
 233 struct eproto {
 234         char *s;
 235         u_short p;
 236 };
 237
 238 /* Static data base of ether protocol types. */
 239 struct eproto eproto_db[] = {
 240         { "pup", ETHERTYPE_PUP },
 241         { "xns", ETHERTYPE_NS },
 242         { "ip", ETHERTYPE_IP },
 243 #ifdef INET6
 244         { "ip6", ETHERTYPE_IPV6 },
 245 #endif
 246         { "arp", ETHERTYPE_ARP },
 247         { "rarp", ETHERTYPE_REVARP },
 248         { "sprite", ETHERTYPE_SPRITE },
 249         { "mopdl", ETHERTYPE_MOPDL },
 250         { "moprc", ETHERTYPE_MOPRC },
 251         { "decnet", ETHERTYPE_DN },
 252         { "lat", ETHERTYPE_LAT },
 253         { "sca", ETHERTYPE_SCA },
 254         { "lanbridge", ETHERTYPE_LANBRIDGE },
 255         { "vexp", ETHERTYPE_VEXP },
 256         { "vprod", ETHERTYPE_VPROD },
 257         { "atalk", ETHERTYPE_ATALK },
 258         { "atalkarp", ETHERTYPE_AARP },
 259         { "loopback", ETHERTYPE_LOOPBACK },
 260         { "decdts", ETHERTYPE_DECDTS },
 261         { "decdns", ETHERTYPE_DECDNS },
 262         { (char *)0, 0 }
 263 };
 264
 265 int
 266 pcap_nametoeproto(const char *s)
 267 {
 268         struct eproto *p = eproto_db;
 269
 270         while (p->s != 0) {
 271                 if (strcmp(p->s, s) == 0)
 272                         return p->p;
 273                 p += 1;
 274         }
 275         return PROTO_UNDEF;
 276 }
 277
 278 #include "llc.h"
 279
 280 /* Static data base of LLC values. */
 281 static struct eproto llc_db[] = {
 282         { "iso", LLCSAP_ISONS },
 283         { "stp", LLCSAP_8021D },
 284         { "ipx", LLCSAP_IPX },
 285         { "netbeui", LLCSAP_NETBEUI },
 286         { (char *)0, 0 }
 287 };
 288
 289 int
 290 pcap_nametollc(const char *s)
 291 {
 292         struct eproto *p = llc_db;
 293
 294         while (p->s != 0) {
 295                 if (strcmp(p->s, s) == 0)
 296                         return p->p;
 297                 p += 1;
 298         }
 299         return PROTO_UNDEF;
 300 }
 301
 302 /* Hex digit to integer. */
 303 static inline int
 304 xdtoi(c)
 305         register int c;
 306 {
 307         if (isdigit(c))
 308                 return c - '0';
 309         else if (islower(c))
 310                 return c - 'a' + 10;
 311         else
 312                 return c - 'A' + 10;
 313 }
 314
 315 int
 316 __pcap_atoin(const char *s, bpf_u_int32 *addr)
 317 {
 318         u_int n;
 319         int len;
 320
 321         *addr = 0;
 322         len = 0;
 323         while (1) {
 324                 n = 0;
 325                 while (*s && *s != '.')
 326                         n = n * 10 + *s++ - '0';
 327                 *addr <<= 8;
 328                 *addr |= n & 0xff;
 329                 len += 8;
 330                 if (*s == '\0')
 331                         return len;
 332                 ++s;
 333         }
 334         /* NOTREACHED */
 335 }
 336
 337 int
 338 __pcap_atodn(const char *s, bpf_u_int32 *addr)
 339 {
 340 #define AREASHIFT 10
 341 #define AREAMASK 0176000
 342 #define NODEMASK 01777
 343
 344         u_int node, area;
 345
 346         if (sscanf((char *)s, "%d.%d", &area, &node) != 2)
 347                 bpf_error("malformed decnet address '%s'", s);
 348
 349         *addr = (area << AREASHIFT) & AREAMASK;
 350         *addr |= (node & NODEMASK);
 351
 352         return(32);
 353 }
 354
 355 /*
 356  * Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new
 357  * ethernet address.  Assumes 's' is well formed.
 358  */
 359 u_char *
 360 pcap_ether_aton(const char *s)
 361 {
 362         register u_char *ep, *e;
 363         register u_int d;
 364
 365         e = ep = (u_char *)malloc(6);
 366
 367         while (*s) {
 368                 if (*s == ':')
 369                         s += 1;
 370                 d = xdtoi(*s++);
 371                 if (isxdigit((unsigned char)*s)) {
 372                         d <<= 4;
 373                         d |= xdtoi(*s++);
 374                 }
 375                 *ep++ = d;
 376         }
 377
 378         return (e);
 379 }
 380
 381 #ifndef HAVE_ETHER_HOSTTON
 382 /* Roll our own */
 383 u_char *
 384 pcap_ether_hostton(const char *name)
 385 {
 386         register struct pcap_etherent *ep;
 387         register u_char *ap;
 388         static FILE *fp = NULL;
 389         static int init = 0;
 390
 391         if (!init) {
 392                 fp = fopen(PCAP_ETHERS_FILE, "r");
 393                 ++init;
 394                 if (fp == NULL)
 395                         return (NULL);
 396         } else if (fp == NULL)
 397                 return (NULL);
 398         else
 399                 rewind(fp);
 400
 401         while ((ep = pcap_next_etherent(fp)) != NULL) {
 402                 if (strcmp(ep->name, name) == 0) {
 403                         ap = (u_char *)malloc(6);
 404                         if (ap != NULL) {
 405                                 memcpy(ap, ep->addr, 6);
 406                                 return (ap);
 407                         }
 408                         break;
 409                 }
 410         }
 411         return (NULL);
 412 }
 413 #else
 414
 415 #if !defined(HAVE_DECL_ETHER_HOSTTON) || !HAVE_DECL_ETHER_HOSTTON
 416 extern int ether_hostton(const char *, struct ether_addr *);
 417 #endif
 418
 419 /* Use the os supplied routines */
 420 u_char *
 421 pcap_ether_hostton(const char *name)
 422 {
 423         register u_char *ap;
 424         u_char a[6];
 425
 426         ap = NULL;
 427         if (ether_hostton((char *)name, (struct ether_addr *)a) == 0) {
 428                 ap = (u_char *)malloc(6);
 429                 if (ap != NULL)
 430                         memcpy((char *)ap, (char *)a, 6);
 431         }
 432         return (ap);
 433 }
 434 #endif
 435
 436 u_short
 437 __pcap_nametodnaddr(const char *name)
 438 {
 439 #ifdef  DECNETLIB
 440         struct nodeent *getnodebyname();
 441         struct nodeent *nep;
 442         unsigned short res;
 443
 444         nep = getnodebyname(name);
 445         if (nep == ((struct nodeent *)0))
 446                 bpf_error("unknown decnet host name '%s'\n", name);
 447
 448         memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short));
 449         return(res);
 450 #else
 451         bpf_error("decnet name support not included, '%s' cannot be translated\n",
 452                 name);
 453         return(0);
 454 #endif
 455 }