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

   1 /*      $NetBSD: copyhostent.c,v 1.1.1.1 2011/04/13 18:15:40 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 /*
  41  * return a malloced copy of `h'
  42  */
  43
  44 ROKEN_LIB_FUNCTION struct hostent * ROKEN_LIB_CALL
  45 copyhostent (const struct hostent *h)
  46 {
  47     struct hostent *res;
  48     char **p;
  49     int i, n;
  50
  51     res = malloc (sizeof (*res));
  52     if (res == NULL)
  53         return NULL;
  54     res->h_name      = NULL;
  55     res->h_aliases   = NULL;
  56     res->h_addrtype  = h->h_addrtype;
  57     res->h_length    = h->h_length;
  58     res->h_addr_list = NULL;
  59     res->h_name = strdup (h->h_name);
  60     if (res->h_name == NULL) {
  61         freehostent (res);
  62         return NULL;
  63     }
  64     for (n = 0, p = h->h_aliases; *p != NULL; ++p)
  65         ++n;
  66     res->h_aliases = malloc ((n + 1) * sizeof(*res->h_aliases));
  67     if (res->h_aliases == NULL) {
  68         freehostent (res);
  69         return NULL;
  70     }
  71     for (i = 0; i < n + 1; ++i)
  72         res->h_aliases[i] = NULL;
  73     for (i = 0; i < n; ++i) {
  74         res->h_aliases[i] = strdup (h->h_aliases[i]);
  75         if (res->h_aliases[i] == NULL) {
  76             freehostent (res);
  77             return NULL;
  78         }
  79     }
  80
  81     for (n = 0, p = h->h_addr_list; *p != NULL; ++p)
  82         ++n;
  83     res->h_addr_list = malloc ((n + 1) * sizeof(*res->h_addr_list));
  84     if (res->h_addr_list == NULL) {
  85         freehostent (res);
  86         return NULL;
  87     }
  88     for (i = 0; i < n + 1; ++i) {
  89         res->h_addr_list[i] = NULL;
  90     }
  91     for (i = 0; i < n; ++i) {
  92         res->h_addr_list[i] = malloc (h->h_length);
  93         if (res->h_addr_list[i] == NULL) {
  94             freehostent (res);
  95             return NULL;
  96         }
  97         memcpy (res->h_addr_list[i], h->h_addr_list[i], h->h_length);
  98     }
  99     return res;
 100 }
 101