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1 /*	$NetBSD: hostent.h,v 1.2 2013/08/27 09:56:12 christos Exp $	*/
2 
3 /*-
4  * Copyright (c) 2013 The NetBSD Foundation, Inc.
5  * All rights reserved.
6  *
7  * This code is derived from software contributed to The NetBSD Foundation
8  * by Christos Zoulas.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions
12  * are met:
13  * 1. Redistributions of source code must retain the above copyright
14  *    notice, this list of conditions and the following disclaimer.
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  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29  * POSSIBILITY OF SUCH DAMAGE.
30  */
31 #ifndef NETD_RESOLV_HOSTENT_H
32 #define NETD_RESOLV_HOSTENT_H
33 
34 #include <netdb.h>
35 #include <stdio.h>
36 
37 struct getnamaddr {
38     struct hostent* hp;
39     char* buf;
40     size_t buflen;
41 };
42 
43 // /etc/hosts lookup
44 int _hf_gethtbyaddr(const unsigned char* uaddr, int len, int af, getnamaddr* info);
45 int _hf_gethtbyname2(const char* name, int af, getnamaddr* info);
46 hostent* netbsd_gethostent_r(FILE*, struct hostent*, char*, size_t, int*);
47 
48 // Reserved padding for remapping IPv4 address to NAT64 synthesis IPv6 address
49 static const char NAT64_PAD[NS_IN6ADDRSZ - NS_INADDRSZ] = {};
50 
51 #define HENT_ARRAY(dst, anum, ptr, len) do {     \
52         size_t _len = (anum + 1) * sizeof(*dst); \
53         if (_len > len) goto nospc;              \
54         dst = (char**) ptr;                      \
55         ptr += _len;                             \
56         len -= _len;                             \
57     } while (0)
58 
59 #define HENT_COPY(dst, src, slen, ptr, len) do { \
60         if ((size_t) slen > len) goto nospc;     \
61         memcpy(ptr, src, (size_t) slen);         \
62         dst = ptr;                               \
63         ptr += slen;                             \
64         len -= slen;                             \
65     } while (0)
66 
67 #define HENT_SCOPY(dst, src, ptr, len) do {  \
68         size_t _len = strlen(src) + 1;       \
69         HENT_COPY(dst, src, _len, ptr, len); \
70     } while (0)
71 
72 #endif  // NETD_RESOLV_HOSTENT_H
73