external/bsd/bind/dist/lib/lwres/herror.c

   1 /*      $NetBSD$        */
   2
   3 /*
   4  * Portions Copyright (C) 2004, 2005, 2007  Internet Systems Consortium, Inc. ("ISC")
   5  * Portions Copyright (C) 2000, 2001, 2003  Internet Software Consortium.
   6  *
   7  * Permission to use, copy, modify, and/or distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
  12  * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
  13  * AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
  14  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
  15  * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
  16  * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
  17  * PERFORMANCE OF THIS SOFTWARE.
  18  */
  19
  20 /*
  21  * Copyright (c) 1987, 1993
  22  *    The Regents of the University of California.  All rights reserved.
  23  *
  24  * Redistribution and use in source and binary forms, with or without
  25  * modification, are permitted provided that the following conditions
  26  * are met:
  27  * 1. Redistributions of source code must retain the above copyright
  28  *    notice, this list of conditions and the following disclaimer.
  29  * 2. Redistributions in binary form must reproduce the above copyright
  30  *    notice, this list of conditions and the following disclaimer in the
  31  *    documentation and/or other materials provided with the distribution.
  32  * 3. All advertising materials mentioning features or use of this software
  33  *    must display the following acknowledgement:
  34  *      This product includes software developed by the University of
  35  *      California, Berkeley and its contributors.
  36  * 4. Neither the name of the University nor the names of its contributors
  37  *    may be used to endorse or promote products derived from this software
  38  *    without specific prior written permission.
  39  *
  40  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  41  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  42  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  43  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  44  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  45  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  46  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  47  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  48  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  49  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  50  * SUCH DAMAGE.
  51  */
  52
  53 /*! \file herror.c
  54    lwres_herror() prints the string s on stderr followed by the string
  55    generated by lwres_hstrerror() for the error code stored in the global
  56    variable lwres_h_errno.
  57
  58    lwres_hstrerror() returns an appropriate string for the error code
  59    gievn by err. The values of the error codes and messages are as
  60    follows:
  61
  62 \li   #NETDB_SUCCESS: Resolver Error 0 (no error)
  63
  64 \li   #HOST_NOT_FOUND: Unknown host
  65
  66 \li #TRY_AGAIN: Host name lookup failure
  67
  68 \li   #NO_RECOVERY: Unknown server error
  69
  70 \li   #NO_DATA: No address associated with name
  71
  72  */
  73
  74 #if defined(LIBC_SCCS) && !defined(lint)
  75 static const char sccsid[] = "@(#)herror.c      8.1 (Berkeley) 6/4/93";
  76 static const char rcsid[] =
  77         "Id: herror.c,v 1.17 2007/06/19 23:47:22 tbox Exp";
  78 #endif /* LIBC_SCCS and not lint */
  79
  80 #include <config.h>
  81
  82 #include <stdio.h>
  83
  84 #include <lwres/netdb.h>
  85 #include <lwres/platform.h>
  86
  87 LIBLWRES_EXTERNAL_DATA int      lwres_h_errno;
  88
  89 /*!
  90  * these have never been declared in any header file so make them static
  91  */
  92
  93 static const char *h_errlist[] = {
  94         "Resolver Error 0 (no error)",          /*%< 0 no error */
  95         "Unknown host",                         /*%< 1 HOST_NOT_FOUND */
  96         "Host name lookup failure",             /*%< 2 TRY_AGAIN */
  97         "Unknown server error",                 /*%< 3 NO_RECOVERY */
  98         "No address associated with name",      /*%< 4 NO_ADDRESS */
  99 };
 100
 101 static int      h_nerr = { sizeof(h_errlist) / sizeof(h_errlist[0]) };
 102
 103
 104 /*!
 105  * herror --
 106  *      print the error indicated by the h_errno value.
 107  */
 108 void
 109 lwres_herror(const char *s) {
 110         fprintf(stderr, "%s: %s\n", s, lwres_hstrerror(lwres_h_errno));
 111 }
 112
 113 /*!
 114  * hstrerror --
 115  *      return the string associated with a given "host" errno value.
 116  */
 117 const char *
 118 lwres_hstrerror(int err) {
 119         if (err < 0)
 120                 return ("Resolver internal error");
 121         else if (err < h_nerr)
 122                 return (h_errlist[err]);
 123         return ("Unknown resolver error");
 124 }