1 /* $NetBSD: hostent.h,v 1.3 2022/04/19 20:32:15 rillig 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 32 #include <stdio.h> 33 #include <netdb.h> 34 #include <stdarg.h> 35 36 /* 37 * These are not being advertised because the interfaces are non-standard. 38 * There are versions by linux, aix, qnx, sun, etc. Our versions are used 39 * internally to provide thread safety; they mostly resemble qnx. 40 */ 41 void sethostent_r(FILE **); 42 struct hostent *gethostent_r(FILE *, struct hostent *, char *, size_t, int *); 43 void endhostent_r(FILE **); 44 45 struct hostent *gethostbyname_r(const char *, struct hostent *, char *, size_t, 46 int *); 47 struct hostent *gethostbyname2_r(const char *, int, struct hostent *, char *, 48 size_t, int *); 49 struct hostent *gethostbyaddr_r(const void *, socklen_t, int, struct hostent *, 50 char *, size_t, int *); 51 52 extern FILE *_h_file; 53 54 /* 55 * The following are internal API's and are used only for testing. 56 */ 57 struct getnamaddr { 58 struct hostent *hp; 59 char *buf; 60 size_t buflen; 61 int *he; 62 }; 63 64 /* /etc/hosts lookup */ 65 void _hf_sethostsfile(const char *); 66 int _hf_gethtbyaddr(void *, void *, va_list); 67 int _hf_gethtbyname(void *, void *, va_list); 68 69 /* DNS lookup */ 70 int _dns_gethtbyaddr(void *, void *, va_list); 71 int _dns_gethtbyname(void *, void *, va_list); 72 73 #ifdef YP 74 /* NIS lookup */ 75 int _yp_gethtbyaddr(void *, void *, va_list); 76 int _yp_gethtbyname(void *, void *, va_list); 77 #endif 78 79 #define HENT_ARRAY(dst, anum, ptr, len) \ 80 do { \ 81 size_t _len = (anum + 1) * sizeof(*dst); \ 82 if (_len > len) \ 83 goto nospc; \ 84 dst = (void *)ptr; \ 85 ptr += _len; \ 86 len -= _len; \ 87 } while (0) 88 89 #define HENT_COPY(dst, src, slen, ptr, len) \ 90 do { \ 91 if ((size_t)slen > len) \ 92 goto nospc; \ 93 memcpy(ptr, src, (size_t)slen); \ 94 dst = ptr; \ 95 ptr += slen; \ 96 len -= slen; \ 97 } while (0) 98 99 #define HENT_SCOPY(dst, src, ptr, len) \ 100 do { \ 101 size_t _len = strlen(src) + 1; \ 102 HENT_COPY(dst, src, _len, ptr, len); \ 103 } while (0) 104 105 #define MAXALIASES 35 106 #define MAXADDRS 35 107