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  * @(#)gethostnamadr.c  8.1 (Berkeley) 6/4/93
  50  * $FreeBSD: src/lib/libc/net/gethostbyht.c,v 1.27 2007/01/09 00:28:02 imp Exp $
  51  * $DragonFly: src/lib/libc/net/gethostbyht.c,v 1.6 2005/11/13 02:04:47 swildner Exp $
  52  */
  53
  54 #include <sys/param.h>
  55 #include <sys/socket.h>
  56 #include <netinet/in.h>
  57 #include <arpa/inet.h>
  58 #include <netdb.h>
  59 #include <stdio.h>
  60 #include <ctype.h>
  61 #include <string.h>
  62 #include <stdarg.h>
  63 #include <nsswitch.h>
  64 #include <arpa/nameser.h>       /* XXX */
  65 #include <resolv.h>             /* XXX */
  66 #include "netdb_private.h"
  67
  68 void
  69 _sethosthtent(int f, struct hostent_data *hed)
  70 {
  71         if (!hed->hostf)
  72                 hed->hostf = fopen(_PATH_HOSTS, "r");
  73         else
  74                 rewind(hed->hostf);
  75         hed->stayopen = f;
  76 }
  77
  78 void
  79 _endhosthtent(struct hostent_data *hed)
  80 {
  81         if (hed->hostf && !hed->stayopen) {
  82                 fclose(hed->hostf);
  83                 hed->hostf = NULL;
  84         }
  85 }
  86
  87 static int
  88 gethostent_p(struct hostent *he, struct hostent_data *hed, int mapped,
  89              res_state statp)
  90 {
  91         char *p, *bp, *ep;
  92         char *cp, **q;
  93         int af, len;
  94         char hostbuf[BUFSIZ + 1];
  95
  96         if (!hed->hostf && !(hed->hostf = fopen(_PATH_HOSTS, "r"))) {
  97                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
  98                 return (-1);
  99         }
 100  again:
 101         if (!(p = fgets(hostbuf, sizeof hostbuf, hed->hostf))) {
 102                 RES_SET_H_ERRNO(statp, HOST_NOT_FOUND);
 103                 return (-1);
 104         }
 105         if (*p == '#')
 106                 goto again;
 107         cp = strpbrk(p, "#\n");
 108         if (cp != NULL)
 109                 *cp = '\0';
 110         if (!(cp = strpbrk(p, " \t")))
 111                 goto again;
 112         *cp++ = '\0';
 113         if (inet_pton(AF_INET6, p, hed->host_addr) > 0) {
 114                 af = AF_INET6;
 115                 len = IN6ADDRSZ;
 116         } else if (inet_pton(AF_INET, p, hed->host_addr) > 0) {
 117                 if (mapped) {
 118                         _map_v4v6_address((char *)hed->host_addr,
 119                             (char *)hed->host_addr);
 120                         af = AF_INET6;
 121                         len = IN6ADDRSZ;
 122                 } else {
 123                         af = AF_INET;
 124                         len = INADDRSZ;
 125                 }
 126         } else {
 127                 goto again;
 128         }
 129         hed->h_addr_ptrs[0] = (char *)hed->host_addr;
 130         hed->h_addr_ptrs[1] = NULL;
 131         he->h_addr_list = hed->h_addr_ptrs;
 132         he->h_length = len;
 133         he->h_addrtype = af;
 134         while (*cp == ' ' || *cp == '\t')
 135                 cp++;
 136         bp = hed->hostbuf;
 137         ep = hed->hostbuf + sizeof hed->hostbuf;
 138         he->h_name = bp;
 139         q = he->h_aliases = hed->host_aliases;
 140         if ((p = strpbrk(cp, " \t")) != NULL)
 141                 *p++ = '\0';
 142         len = strlen(cp) + 1;
 143         if (ep - bp < len) {
 144                 RES_SET_H_ERRNO(statp, NO_RECOVERY);
 145                 return (-1);
 146         }
 147         strlcpy(bp, cp, ep - bp);
 148         bp += len;
 149         cp = p;
 150         while (cp && *cp) {
 151                 if (*cp == ' ' || *cp == '\t') {
 152                         cp++;
 153                         continue;
 154                 }
 155                 if (q >= &hed->host_aliases[_MAXALIASES - 1])
 156                         break;
 157                 if ((p = strpbrk(cp, " \t")) != NULL)
 158                         *p++ = '\0';
 159                 len = strlen(cp) + 1;
 160                 if (ep - bp < len)
 161                         break;
 162                 strlcpy(bp, cp, ep - bp);
 163                 *q++ = bp;
 164                 bp += len;
 165                 cp = p;
 166         }
 167         *q = NULL;
 168         RES_SET_H_ERRNO(statp, NETDB_SUCCESS);
 169         return (0);
 170 }
 171
 172 int
 173 gethostent_r(struct hostent *hptr, char *buffer, size_t buflen,
 174              struct hostent **result, int *h_errnop)
 175 {
 176         struct hostent_data *hed;
 177         struct hostent he;
 178         res_state statp;
 179
 180         statp = __res_state();
 181         if ((statp->options & RES_INIT) == 0 && res_ninit(statp) == -1) {
 182                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 183                 *h_errnop = statp->res_h_errno;
 184                 return (-1);
 185         }
 186         if ((hed = __hostent_data_init()) == NULL) {
 187                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 188                 *h_errnop = statp->res_h_errno;
 189                 return (-1);
 190         }
 191         if (gethostent_p(&he, hed, statp->options & RES_USE_INET6, statp) != 0)
 192                 return (-1);
 193         if (__copy_hostent(&he, hptr, buffer, buflen) != 0)
 194                 return (-1);
 195         *result = hptr;
 196         return (0);
 197 }
 198
 199 struct hostent *
 200 gethostent(void)
 201 {
 202         struct hostdata *hd;
 203         struct hostent *rval;
 204         int ret_h_errno;
 205
 206         if ((hd = __hostdata_init()) == NULL)
 207                 return (NULL);
 208         if (gethostent_r(&hd->host, hd->data, sizeof(hd->data), &rval,
 209             &ret_h_errno) != 0)
 210                 return (NULL);
 211         return (rval);
 212 }
 213
 214 int
 215 _ht_gethostbyname(void *rval, void *cb_data, va_list ap)
 216 {
 217         const char *name;
 218         int af;
 219         char *buffer;
 220         size_t buflen;
 221         int *errnop, *h_errnop;
 222         struct hostent *hptr, he;
 223         struct hostent_data *hed;
 224         char **cp;
 225         res_state statp;
 226         int error;
 227
 228         name = va_arg(ap, const char *);
 229         af = va_arg(ap, int);
 230         hptr = va_arg(ap, struct hostent *);
 231         buffer = va_arg(ap, char *);
 232         buflen = va_arg(ap, size_t);
 233         errnop = va_arg(ap, int *);
 234         h_errnop = va_arg(ap, int *);
 235
 236         *((struct hostent **)rval) = NULL;
 237
 238         statp = __res_state();
 239         if ((hed = __hostent_data_init()) == NULL) {
 240                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 241                 *h_errnop = statp->res_h_errno;
 242                 return (NS_NOTFOUND);
 243         }
 244
 245         _sethosthtent(0, hed);
 246         while ((error = gethostent_p(&he, hed, 0, statp)) == 0) {
 247                 if (he.h_addrtype != af)
 248                         continue;
 249                 if (he.h_addrtype == AF_INET &&
 250                     statp->options & RES_USE_INET6) {
 251                         _map_v4v6_address(he.h_addr, he.h_addr);
 252                         he.h_length = IN6ADDRSZ;
 253                         he.h_addrtype = AF_INET6;
 254                 }
 255                 if (strcasecmp(he.h_name, name) == 0)
 256                         break;
 257                 for (cp = he.h_aliases; *cp != 0; cp++)
 258                         if (strcasecmp(*cp, name) == 0)
 259                                 goto found;
 260         }
 261 found:
 262         _endhosthtent(hed);
 263
 264         if (error != 0) {
 265                 *h_errnop = statp->res_h_errno;
 266                 return (NS_NOTFOUND);
 267         }
 268         if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
 269                 *h_errnop = statp->res_h_errno;
 270                 return (NS_NOTFOUND);
 271         }
 272         *((struct hostent **)rval) = hptr;
 273         return (NS_SUCCESS);
 274 }
 275
 276 int
 277 _ht_gethostbyaddr(void *rval, void *cb_data, va_list ap)
 278 {
 279         const void *addr;
 280         socklen_t len;
 281         int af;
 282         char *buffer;
 283         size_t buflen;
 284         int *errnop, *h_errnop;
 285         struct hostent *hptr, he;
 286         struct hostent_data *hed;
 287         res_state statp;
 288         int error;
 289
 290         addr = va_arg(ap, const void *);
 291         len = va_arg(ap, socklen_t);
 292         af = va_arg(ap, int);
 293         hptr = va_arg(ap, struct hostent *);
 294         buffer = va_arg(ap, char *);
 295         buflen = va_arg(ap, size_t);
 296         errnop = va_arg(ap, int *);
 297         h_errnop = va_arg(ap, int *);
 298
 299         *((struct hostent **)rval) = NULL;
 300
 301         statp = __res_state();
 302         if ((hed = __hostent_data_init()) == NULL) {
 303                 RES_SET_H_ERRNO(statp, NETDB_INTERNAL);
 304                 *h_errnop = statp->res_h_errno;
 305                 return (NS_NOTFOUND);
 306         }
 307
 308         _sethosthtent(0, hed);
 309         while ((error = gethostent_p(&he, hed, 0, statp)) == 0)
 310                 if (he.h_addrtype == af && !bcmp(he.h_addr, addr, len)) {
 311                         if (he.h_addrtype == AF_INET &&
 312                             statp->options & RES_USE_INET6) {
 313                                 _map_v4v6_address(he.h_addr, he.h_addr);
 314                                 he.h_length = IN6ADDRSZ;
 315                                 he.h_addrtype = AF_INET6;
 316                         }
 317                         break;
 318                 }
 319         _endhosthtent(hed);
 320
 321         if (error != 0)
 322                 return (NS_NOTFOUND);
 323         if (__copy_hostent(&he, hptr, buffer, buflen) != 0) {
 324                 *h_errnop = statp->res_h_errno;
 325                 return (NS_NOTFOUND);
 326         }
 327         *((struct hostent **)rval) = hptr;
 328         return (NS_SUCCESS);
 329 }