/*      $NetBSD: hostent.h,v 1.3 2022/04/19 20:32:15 rillig Exp $       */

/*-
* Copyright (c) 2013 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Christos Zoulas.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
*    notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
*    notice, this list of conditions and the following disclaimer in the
*    documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
* TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
* BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/

#include <stdio.h>
#include <netdb.h>
#include <stdarg.h>

/*
* These are not being advertised because the interfaces are non-standard.
* There are versions by linux, aix, qnx, sun, etc. Our versions are used
* internally to provide thread safety; they mostly resemble qnx.
*/
void sethostent_r(FILE **);
struct hostent  *gethostent_r(FILE *, struct hostent *, char *, size_t, int *);
void endhostent_r(FILE **);

struct hostent *gethostbyname_r(const char *, struct hostent *, char *, size_t,
   int *);
struct hostent *gethostbyname2_r(const char *, int, struct hostent *, char *,
   size_t, int *);
struct hostent *gethostbyaddr_r(const void *, socklen_t, int, struct hostent *,
   char *, size_t, int *);

extern FILE *_h_file;

/*
* The following are internal API's and are used only for testing.
*/
struct getnamaddr {
       struct hostent *hp;
       char *buf;
       size_t buflen;
       int *he;
};

/* /etc/hosts lookup */
void _hf_sethostsfile(const char *);
int _hf_gethtbyaddr(void *, void *, va_list);
int _hf_gethtbyname(void *, void *, va_list);

/* DNS lookup */
int _dns_gethtbyaddr(void *, void *, va_list);
int _dns_gethtbyname(void *, void *, va_list);

#ifdef YP
/* NIS lookup */
int _yp_gethtbyaddr(void *, void *, va_list);
int _yp_gethtbyname(void *, void *, va_list);
#endif

#define HENT_ARRAY(dst, anum, ptr, len) \
       do { \
               size_t _len = (anum + 1) * sizeof(*dst); \
               if (_len > len) \
                       goto nospc; \
               dst = (void *)ptr; \
               ptr += _len; \
               len -= _len; \
       } while (0)

#define HENT_COPY(dst, src, slen, ptr, len) \
       do { \
               if ((size_t)slen > len) \
                       goto nospc; \
               memcpy(ptr, src, (size_t)slen); \
               dst = ptr; \
               ptr += slen; \
               len -= slen; \
       } while (0)

#define HENT_SCOPY(dst, src, ptr, len) \
       do { \
               size_t _len = strlen(src) + 1; \
               HENT_COPY(dst, src, _len, ptr, len); \
       } while (0)

#define MAXALIASES      35
#define MAXADDRS        35