lib/libc/net/gethostbyht.c

   1 /*-
   2  * Copyright (c) 1985, 1988, 1993
   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 the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  * -
  29  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  30  *
  31  * Permission to use, copy, modify, and distribute this software for any
  32  * purpose with or without fee is hereby granted, provided that the above
  33  * copyright notice and this permission notice appear in all copies, and that
  34  * the name of Digital Equipment Corporation not be used in advertising or
  35  * publicity pertaining to distribution of the document or software without
  36  * specific, written prior permission.
  37  *
  38  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  39  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  40  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  41  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  42  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  43  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  44  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  45  * SOFTWARE.
  46  * -
  47  * --Copyright--
  48  */
  49
  50 #if defined(LIBC_SCCS) && !defined(lint)
  51 static char sccsid[] = "@(#)gethostnamadr.c     8.1 (Berkeley) 6/4/93";
  52 #endif /* LIBC_SCCS and not lint */
  53 #include <sys/cdefs.h>
  54 __FBSDID("$FreeBSD$");
  55
  56 #include <sys/param.h>
  57 #include <sys/socket.h>
  58 #include <netinet/in.h>
  59 #include <arpa/inet.h>
  60 #include <netdb.h>
  61 #include <stdio.h>
  62 #include <ctype.h>
  63 #include <errno.h>
  64 #include <string.h>
  65 #include <stdarg.h>
  66 #include <nsswitch.h>
  67 #include <arpa/nameser.h>       /* XXX */
  68 #include <resolv.h>             /* XXX */
  69 #include "netdb_private.h"
  70
  71 void
  72 _sethosthtent(int f, struct hostent_data *hed)
  73 {
  74         if (!hed->hostf)
  75                 hed->hostf = fopen(_PATH_HOSTS, "re");
  76         else
  77                 rewind(hed->hostf);
  78         hed->stayopen = f;
  79 }
  80
  81 void
  82 _endhosthtent(struct hostent_data *hed)
  83 {
  84         if (hed->hostf && !hed->stayopen) {
  85                 (void) fclose(hed->hostf);
  86                 hed->hostf = NULL;
  87         }
  88 }
  89
  90 static int
  91 gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped,
  92     res_state statp)
  93 {
  94         char *p, *bp, *ep;
  95         char *cp, **q;
  96         int af, len;
  97         char hostbuf[BUFSIZ + 1];
  98
  99         if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "re"))) {
 100                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 101                 return (-1);
 102         }
 103  again:
 104         if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) {
 105                 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
 106                 return (-1);
 107         }
 108         if (*p == '#')
 109                 goto again;
 110         cp = strpbrk(p, "#\n");
 111         if (cp != NULL)
 112                 *cp = '\0';
 113         if (!(cp = strpbrk(p, " \t")))
 114                 goto again;
 115         *cp++ = '\0';
 116         if (inet_pton(AF_INET6, p, hed->host_addr) > 0) {
 117                 af = AF_INET6;
 118                 len = IN6ADDRSZ;
 119         } else if (inet_pton(AF_INET, p, hed->host_addr) > 0) {
 120                 if (mapped) {
 121                         _map_v4v6_address((char *)hed->host_addr,
 122                             (char *)hed->host_addr);
 123                         af = AF_INET6;
 124                         len = IN6ADDRSZ;
 125                 } else {
 126                         af = AF_INET;
 127                         len = INADDRSZ;
 128                 }
 129         } else {
 130                 goto again;
 131         }
 132         hed->h_addr_ptrs[0] = (char *)hed->host_addr;
 133         hed->h_addr_ptrs[1] = NULL;
 134         he->h_addr_list = hed->h_addr_ptrs;
 135         he->h_length = len;
 136         he->h_addrtype = af;
 137         while (*cp == ' ' || *cp == '\t')
 138                 cp++;
 139         bp = hed->hostbuf;
 140         ep = hed->hostbuf + sizeof hed->hostbuf;
 141         he->h_name = bp;
 142         q = he->h_aliases = hed->host_aliases;
 143         if ((p = strpbrk(cp, " \t")) != NULL)
 144                 *p++ = '\0';
 145         len = strlen(cp) + 1;
 146         if (ep - bp < len) {
 147                 RES_SET_H_ERRNO(statp, NO_RECOVERY);
 148                 return (-1);
 149         }
 150         strlcpy(bp, cp, ep - bp);
 151         bp += len;
 152         cp = p;
 153         while (cp && *cp) {
 154                 if (*cp == ' ' || *cp == '\t') {
 155                         cp++;
 156                         continue;
 157                 }
 158                 if (q >= &hed->host_aliases[_MAXALIASES - 1])
 159                         break;
 160                 if ((p = strpbrk(cp, " \t")) != NULL)
 161                         *p++ = '\0';
 162                 len = strlen(cp) + 1;
 163                 if (ep - bp < len)
 164                         break;
 165                 strlcpy(bp, cp, ep - bp);
 166                 *q++ = bp;
 167                 bp += len;
 168                 cp = p;
 169         }
 170         *q = NULL;
 171         RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
 172         return (0);
 173 }
 174
 175 int
 176 gethostent_r(struct hostent *hptr, char *buffer, size_t buflen,
 177     struct hostent **result, int *h_errnop)
 178 {
 179         struct hostent_data *hed;
 180         struct hostent he;
 181         res_state statp;
 182
 183         statp = __res_state();
 184         if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
 185                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 186                 *h_errnop = statp->res_h_errno;
 187                 return (-1);
 188         }
 189         if ((hed = __hostent_data_init()) == NULL) {
 190                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 191                 *h_errnop = statp->res_h_errno;
 192                 return (-1);
 193         }
 194         if (gethostent_p(&he, hed, statp->options & RES_USE_INET6, statp) != 0)
 195                 return (-1);
 196         if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
 197                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 198                 *h_errnop = statp->res_h_errno;
 199                 return ((errno != 0) ? errno : -1);
 200         }
 201         *result = hptr;
 202         return (0);
 203 }
 204
 205 struct hostent *
 206 gethostent(void)
 207 {
 208         struct hostdata *hd;
 209         struct hostent *rval;
 210         int ret_h_errno;
 211
 212         if ((hd = __hostdata_init()) == NULL)
 213                 return (NULL);
 214         if (gethostent_r(&hd->host, hd->data, sizeof(hd->data), &rval,
 215             &ret_h_errno) != 0)
 216                 return (NULL);
 217         return (rval);
 218 }
 219
 220 int
 221 _ht_gethostbyname(void *rval, void *cb_data, va_list ap)
 222 {
 223         const char *name;
 224         int af;
 225         char *buffer;
 226         size_t buflen;
 227         int *errnop, *h_errnop;
 228         struct hostent *hptr, he;
 229         struct hostent_data *hed;
 230         char **cp;
 231         res_state statp;
 232         int error;
 233
 234         name = va_arg(ap, const char *);
 235         af = va_arg(ap, int);
 236         hptr = va_arg(ap, struct hostent *);
 237         buffer = va_arg(ap, char *);
 238         buflen = va_arg(ap, size_t);
 239         errnop = va_arg(ap, int *);
 240         h_errnop = va_arg(ap, int *);
 241
 242         *((struct hostent **)rval) = NULL;
 243
 244         statp = __res_state();
 245         if ((hed = __hostent_data_init()) == NULL) {
 246                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 247                 *h_errnop = statp->res_h_errno;
 248                 return (NS_NOTFOUND);
 249         }
 250
 251         _sethosthtent(0, hed);
 252         while ((error = gethostent_p(&he, hed, 0, statp)) == 0) {
 253                 if (he.h_addrtype != af)
 254                         continue;
 255                 if (he.h_addrtype == AF_INET &&
 256                     statp->options & RES_USE_INET6) {
 257                         _map_v4v6_address(he.h_addr, he.h_addr);
 258                         he.h_length = IN6ADDRSZ;
 259                         he.h_addrtype = AF_INET6;
 260                 }
 261                 if (strcasecmp(he.h_name, name) == 0)
 262                         break;
 263                 for (cp = he.h_aliases; *cp != 0; cp++)
 264                         if (strcasecmp(*cp, name) == 0)
 265                                 goto found;
 266         }
 267 found:
 268         _endhosthtent(hed);
 269
 270         if (error != 0) {
 271                 *h_errnop = statp->res_h_errno;
 272                 return (NS_NOTFOUND);
 273         }
 274         if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
 275                 *errnop = errno;
 276                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 277                 *h_errnop = statp->res_h_errno;
 278                 return (NS_RETURN);
 279         }
 280         *((struct hostent **)rval) = hptr;
 281         return (NS_SUCCESS);
 282 }
 283
 284 int
 285 _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap)
 286 {
 287         const void *addr;
 288         socklen_t len;
 289         int af;
 290         char *buffer;
 291         size_t buflen;
 292         int *errnop, *h_errnop;
 293         struct hostent *hptr, he;
 294         struct hostent_data *hed;
 295         res_state statp;
 296         int error;
 297
 298         addr = va_arg(ap, const void *);
 299         len = va_arg(ap, socklen_t);
 300         af = va_arg(ap, int);
 301         hptr = va_arg(ap, struct hostent *);
 302         buffer = va_arg(ap, char *);
 303         buflen = va_arg(ap, size_t);
 304         errnop = va_arg(ap, int *);
 305         h_errnop = va_arg(ap, int *);
 306
 307         *((struct hostent **)rval) = NULL;
 308
 309         statp = __res_state();
 310         if ((hed = __hostent_data_init()) == NULL) {
 311                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 312                 *h_errnop = statp->res_h_errno;
 313                 return (NS_NOTFOUND);
 314         }
 315
 316         _sethosthtent(0, hed);
 317         while ((error = gethostent_p(&he, hed, 0, statp)) == 0)
 318                 if (he.h_addrtype == af && !bcmp(he.h_addr, addr, len)) {
 319                         if (he.h_addrtype == AF_INET &&
 320                             statp->options & RES_USE_INET6) {
 321                                 _map_v4v6_address(he.h_addr, he.h_addr);
 322                                 he.h_length = IN6ADDRSZ;
 323                                 he.h_addrtype = AF_INET6;
 324                         }
 325                         break;
 326                 }
 327         _endhosthtent(hed);
 328
 329         if (error != 0)
 330                 return (NS_NOTFOUND);
 331         if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
 332                 *errnop = errno;
 333                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 334                 *h_errnop = statp->res_h_errno;
 335                 return (NS_RETURN);
 336         }
 337         *((struct hostent **)rval) = hptr;
 338         return (NS_SUCCESS);
 339 }