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[] =
  27     "@(#) $Header: /tcpdump/master/libpcap/nametoaddr.c,v 1.62 2002-04-07 00:22:30 guy Exp $ (LBL)";
  28 #endif
  29
  30 #ifdef HAVE_CONFIG_H
  31 #include "config.h"
  32 #endif
  33
  34 #include <sys/param.h>
  35 #include <sys/types.h>                          /* concession to AIX */
  36 #include <sys/socket.h>
  37 #include <sys/time.h>
  38
  39 struct mbuf;
  40 struct rtentry;
  41 #include <net/if.h>
  42 #include <netinet/in.h>
  43 #ifdef HAVE_NETINET_IF_ETHER_H
  44 #include <netinet/if_ether.h>
  45 #endif
  46 #include <arpa/inet.h>
  47 #include <netdb.h>
  48
  49 #include <ctype.h>
  50 #include <errno.h>
  51 #include <stdlib.h>
  52 #include <memory.h>
  53 #include <stdio.h>
  54
  55 #include "pcap-int.h"
  56
  57 #include "gencode.h"
  58 #include <pcap-namedb.h>
  59
  60 #ifdef HAVE_OS_PROTO_H
  61 #include "os-proto.h"
  62 #endif
  63
  64 #ifndef NTOHL
  65 #define NTOHL(x) (x) = ntohl(x)
  66 #define NTOHS(x) (x) = ntohs(x)
  67 #endif
  68
  69 static inline int xdtoi(int);
  70
  71 /*
  72  *  Convert host name to internet address.
  73  *  Return 0 upon failure.
  74  */
  75 bpf_u_int32 **
  76 pcap_nametoaddr(const char *name)
  77 {
  78 #ifndef h_addr
  79         static bpf_u_int32 *hlist[2];
  80 #endif
  81         bpf_u_int32 **p;
  82         struct hostent *hp;
  83
  84         if ((hp = gethostbyname(name)) != NULL) {
  85 #ifndef h_addr
  86                 hlist[0] = (bpf_u_int32 *)hp->h_addr;
  87                 NTOHL(hp->h_addr);
  88                 return hlist;
  89 #else
  90                 for (p = (bpf_u_int32 **)hp->h_addr_list; *p; ++p)
  91                         NTOHL(**p);
  92                 return (bpf_u_int32 **)hp->h_addr_list;
  93 #endif
  94         }
  95         else
  96                 return 0;
  97 }
  98
  99 #ifdef INET6
 100 struct addrinfo *
 101 pcap_nametoaddrinfo(const char *name)
 102 {
 103         struct addrinfo hints, *res;
 104         int error;
 105
 106         memset(&hints, 0, sizeof(hints));
 107         hints.ai_family = PF_UNSPEC;
 108         hints.ai_socktype = SOCK_STREAM;        /*not really*/
 109         error = getaddrinfo(name, NULL, &hints, &res);
 110         if (error)
 111                 return NULL;
 112         else
 113                 return res;
 114 }
 115 #endif /*INET6*/
 116
 117 /*
 118  *  Convert net name to internet address.
 119  *  Return 0 upon failure.
 120  */
 121 bpf_u_int32
 122 pcap_nametonetaddr(const char *name)
 123 {
 124         struct netent *np;
 125
 126         if ((np = getnetbyname(name)) != NULL)
 127                 return np->n_net;
 128         else
 129                 return 0;
 130 }
 131
 132 /*
 133  * Convert a port name to its port and protocol numbers.
 134  * We assume only TCP or UDP.
 135  * Return 0 upon failure.
 136  */
 137 int
 138 pcap_nametoport(const char *name, int *port, int *proto)
 139 {
 140         struct servent *sp;
 141         char *other;
 142
 143         sp = getservbyname(name, (char *)0);
 144         if (sp != NULL) {
 145                 NTOHS(sp->s_port);
 146                 *port = sp->s_port;
 147                 *proto = pcap_nametoproto(sp->s_proto);
 148                 /*
 149                  * We need to check /etc/services for ambiguous entries.
 150                  * If we find the ambiguous entry, and it has the
 151                  * same port number, change the proto to PROTO_UNDEF
 152                  * so both TCP and UDP will be checked.
 153                  */
 154                 if (*proto == IPPROTO_TCP)
 155                         other = "udp";
 156                 else
 157                         other = "tcp";
 158
 159                 sp = getservbyname(name, other);
 160                 if (sp != 0) {
 161                         NTOHS(sp->s_port);
 162 #ifdef notdef
 163                         if (*port != sp->s_port)
 164                                 /* Can't handle ambiguous names that refer
 165                                    to different port numbers. */
 166                                 warning("ambiguous port %s in /etc/services",
 167                                         name);
 168 #endif
 169                         *proto = PROTO_UNDEF;
 170                 }
 171                 return 1;
 172         }
 173 #if defined(ultrix) || defined(__osf__)
 174         /* Special hack in case NFS isn't in /etc/services */
 175         if (strcmp(name, "nfs") == 0) {
 176                 *port = 2049;
 177                 *proto = PROTO_UNDEF;
 178                 return 1;
 179         }
 180 #endif
 181         return 0;
 182 }
 183
 184 int
 185 pcap_nametoproto(const char *str)
 186 {
 187         struct protoent *p;
 188
 189         p = getprotobyname(str);
 190         if (p != 0)
 191                 return p->p_proto;
 192         else
 193                 return PROTO_UNDEF;
 194 }
 195
 196 #include "ethertype.h"
 197
 198 struct eproto {
 199         char *s;
 200         u_short p;
 201 };
 202
 203 /* Static data base of ether protocol types. */
 204 struct eproto eproto_db[] = {
 205         { "pup", ETHERTYPE_PUP },
 206         { "xns", ETHERTYPE_NS },
 207         { "ip", ETHERTYPE_IP },
 208 #ifdef INET6
 209         { "ip6", ETHERTYPE_IPV6 },
 210 #endif
 211         { "arp", ETHERTYPE_ARP },
 212         { "rarp", ETHERTYPE_REVARP },
 213         { "sprite", ETHERTYPE_SPRITE },
 214         { "mopdl", ETHERTYPE_MOPDL },
 215         { "moprc", ETHERTYPE_MOPRC },
 216         { "decnet", ETHERTYPE_DN },
 217         { "lat", ETHERTYPE_LAT },
 218         { "sca", ETHERTYPE_SCA },
 219         { "lanbridge", ETHERTYPE_LANBRIDGE },
 220         { "vexp", ETHERTYPE_VEXP },
 221         { "vprod", ETHERTYPE_VPROD },
 222         { "atalk", ETHERTYPE_ATALK },
 223         { "atalkarp", ETHERTYPE_AARP },
 224         { "loopback", ETHERTYPE_LOOPBACK },
 225         { "decdts", ETHERTYPE_DECDTS },
 226         { "decdns", ETHERTYPE_DECDNS },
 227         { (char *)0, 0 }
 228 };
 229
 230 int
 231 pcap_nametoeproto(const char *s)
 232 {
 233         struct eproto *p = eproto_db;
 234
 235         while (p->s != 0) {
 236                 if (strcmp(p->s, s) == 0)
 237                         return p->p;
 238                 p += 1;
 239         }
 240         return PROTO_UNDEF;
 241 }
 242
 243 /* Hex digit to integer. */
 244 static inline int
 245 xdtoi(c)
 246         register int c;
 247 {
 248         if (isdigit(c))
 249                 return c - '0';
 250         else if (islower(c))
 251                 return c - 'a' + 10;
 252         else
 253                 return c - 'A' + 10;
 254 }
 255
 256 int
 257 __pcap_atoin(const char *s, bpf_u_int32 *addr)
 258 {
 259         u_int n;
 260         int len;
 261
 262         *addr = 0;
 263         len = 0;
 264         while (1) {
 265                 n = 0;
 266                 while (*s && *s != '.')
 267                         n = n * 10 + *s++ - '0';
 268                 *addr <<= 8;
 269                 *addr |= n & 0xff;
 270                 len += 8;
 271                 if (*s == '\0')
 272                         return len;
 273                 ++s;
 274         }
 275         /* NOTREACHED */
 276 }
 277
 278 int
 279 __pcap_atodn(const char *s, bpf_u_int32 *addr)
 280 {
 281 #define AREASHIFT 10
 282 #define AREAMASK 0176000
 283 #define NODEMASK 01777
 284
 285         u_int node, area;
 286
 287         if (sscanf((char *)s, "%d.%d", &area, &node) != 2)
 288                 bpf_error("malformed decnet address '%s'", s);
 289
 290         *addr = (area << AREASHIFT) & AREAMASK;
 291         *addr |= (node & NODEMASK);
 292
 293         return(32);
 294 }
 295
 296 /*
 297  * Convert 's' which has the form "xx:xx:xx:xx:xx:xx" into a new
 298  * ethernet address.  Assumes 's' is well formed.
 299  */
 300 u_char *
 301 pcap_ether_aton(const char *s)
 302 {
 303         register u_char *ep, *e;
 304         register u_int d;
 305
 306         e = ep = (u_char *)malloc(6);
 307
 308         while (*s) {
 309                 if (*s == ':')
 310                         s += 1;
 311                 d = xdtoi(*s++);
 312                 if (isxdigit((unsigned char)*s)) {
 313                         d <<= 4;
 314                         d |= xdtoi(*s++);
 315                 }
 316                 *ep++ = d;
 317         }
 318
 319         return (e);
 320 }
 321
 322 #ifndef HAVE_ETHER_HOSTTON
 323 /* Roll our own */
 324 u_char *
 325 pcap_ether_hostton(const char *name)
 326 {
 327         register struct pcap_etherent *ep;
 328         register u_char *ap;
 329         static FILE *fp = NULL;
 330         static int init = 0;
 331
 332         if (!init) {
 333                 fp = fopen(PCAP_ETHERS_FILE, "r");
 334                 ++init;
 335                 if (fp == NULL)
 336                         return (NULL);
 337         } else if (fp == NULL)
 338                 return (NULL);
 339         else
 340                 rewind(fp);
 341
 342         while ((ep = pcap_next_etherent(fp)) != NULL) {
 343                 if (strcmp(ep->name, name) == 0) {
 344                         ap = (u_char *)malloc(6);
 345                         if (ap != NULL) {
 346                                 memcpy(ap, ep->addr, 6);
 347                                 return (ap);
 348                         }
 349                         break;
 350                 }
 351         }
 352         return (NULL);
 353 }
 354 #else
 355
 356 /*
 357  * XXX - perhaps this should, instead, be declared in "lbl/os-XXX.h" files,
 358  * for those OS versions that don't declare it, rather than being declared
 359  * here?  That way, for example, we could declare it on FreeBSD 2.x (which
 360  * doesn't declare it), but not on FreeBSD 3.x (which declares it like
 361  * this) or FreeBSD 4.x (which declares it with its first argument as
 362  * "const char *", so no matter how we declare it here, it'll fail to
 363  * compile on one of 3.x or 4.x).
 364  */
 365 #if !defined(sgi) && !defined(__NetBSD__) && !defined(__FreeBSD__)
 366 extern int ether_hostton(char *, struct ether_addr *);
 367 #endif
 368
 369 /* Use the os supplied routines */
 370 u_char *
 371 pcap_ether_hostton(const char *name)
 372 {
 373         register u_char *ap;
 374         u_char a[6];
 375
 376         ap = NULL;
 377         if (ether_hostton((char *)name, (struct ether_addr *)a) == 0) {
 378                 ap = (u_char *)malloc(6);
 379                 if (ap != NULL)
 380                         memcpy((char *)ap, (char *)a, 6);
 381         }
 382         return (ap);
 383 }
 384 #endif
 385
 386 u_short
 387 __pcap_nametodnaddr(const char *name)
 388 {
 389 #ifdef  DECNETLIB
 390         struct nodeent *getnodebyname();
 391         struct nodeent *nep;
 392         unsigned short res;
 393
 394         nep = getnodebyname(name);
 395         if (nep == ((struct nodeent *)0))
 396                 bpf_error("unknown decnet host name '%s'\n", name);
 397
 398         memcpy((char *)&res, (char *)nep->n_addr, sizeof(unsigned short));
 399         return(res);
 400 #else
 401         bpf_error("decnet name support not included, '%s' cannot be translated\n",
 402                 name);
 403         return(0);
 404 #endif
 405 }