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