lib/libc/net/hostent.h

   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
  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 (/*CONSTCOND*/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 (/* CONSTCOND */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 (/* CONSTCOND */0)
 104
 105 #define MAXALIASES      35
 106 #define MAXADDRS        35