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      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