crypto/external/bsd/heimdal/dist/lib/roken/getipnodebyname.c

   1 /*      $NetBSD: getipnodebyname.c,v 1.1.1.1 2011/04/13 18:15:41 elric Exp $    */
   2
   3 /*
   4  * Copyright (c) 1999 Kungliga Tekniska Högskolan
   5  * (Royal Institute of Technology, Stockholm, Sweden).
   6  * All rights reserved.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  *
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  *
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  *
  19  * 3. Neither the name of the Institute nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <config.h>
  37
  38 #include <krb5/roken.h>
  39
  40 #ifndef HAVE_H_ERRNO
  41 static int h_errno = NO_RECOVERY;
  42 #endif
  43
  44 /*
  45  * lookup `name' (address family `af') in DNS and return a pointer
  46  * to a malloced struct hostent or NULL.
  47  */
  48
  49 ROKEN_LIB_FUNCTION struct hostent * ROKEN_LIB_CALL
  50 getipnodebyname (const char *name, int af, int flags, int *error_num)
  51 {
  52     struct hostent *tmp;
  53
  54 #ifdef HAVE_GETHOSTBYNAME2
  55     tmp = gethostbyname2 (name, af);
  56 #else
  57     if (af != AF_INET) {
  58         *error_num = NO_ADDRESS;
  59         return NULL;
  60     }
  61     tmp = gethostbyname (name);
  62 #endif
  63     if (tmp == NULL) {
  64         switch (h_errno) {
  65         case HOST_NOT_FOUND :
  66         case TRY_AGAIN :
  67         case NO_RECOVERY :
  68             *error_num = h_errno;
  69             break;
  70         case NO_DATA :
  71             *error_num = NO_ADDRESS;
  72             break;
  73         default :
  74             *error_num = NO_RECOVERY;
  75             break;
  76         }
  77         return NULL;
  78     }
  79     tmp = copyhostent (tmp);
  80     if (tmp == NULL) {
  81         *error_num = TRY_AGAIN;
  82         return NULL;
  83     }
  84     return tmp;
  85 }