1 /* $NetBSD: copyhostent.c,v 1.2 2017/01/28 21:31:50 christos 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
copyhostent(const struct hostent * h)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
102