lib/liblwres/herror.c

   1 /*
   2  * Portions Copyright (C) 2000, 2001  Internet Software Consortium.
   3  *
   4  * Permission to use, copy, modify, and distribute this software for any
   5  * purpose with or without fee is hereby granted, provided that the above
   6  * copyright notice and this permission notice appear in all copies.
   7  *
   8  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM
   9  * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
  10  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL
  11  * INTERNET SOFTWARE CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT,
  12  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
  13  * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
  14  * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
  15  * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  16  */
  17
  18 /*
  19  * Copyright (c) 1987, 1993
  20  *    The Regents of the University of California.  All rights reserved.
  21  *
  22  * Redistribution and use in source and binary forms, with or without
  23  * modification, are permitted provided that the following conditions
  24  * are met:
  25  * 1. Redistributions of source code must retain the above copyright
  26  *    notice, this list of conditions and the following disclaimer.
  27  * 2. Redistributions in binary form must reproduce the above copyright
  28  *    notice, this list of conditions and the following disclaimer in the
  29  *    documentation and/or other materials provided with the distribution.
  30  * 3. All advertising materials mentioning features or use of this software
  31  *    must display the following acknowledgement:
  32  *      This product includes software developed by the University of
  33  *      California, Berkeley and its contributors.
  34  * 4. Neither the name of the University nor the names of its contributors
  35  *    may be used to endorse or promote products derived from this software
  36  *    without specific prior written permission.
  37  *
  38  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  39  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  40  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  41  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  42  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  43  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  44  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  45  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  46  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  47  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  48  * SUCH DAMAGE.
  49  */
  50
  51 #if defined(LIBC_SCCS) && !defined(lint)
  52 static const char sccsid[] = "@(#)herror.c      8.1 (Berkeley) 6/4/93";
  53 static const char rcsid[] =
  54         "$Id: herror.c,v 1.1 2004/03/15 20:35:25 as Exp $";
  55 #endif /* LIBC_SCCS and not lint */
  56
  57 #include <config.h>
  58
  59 #include <stdio.h>
  60
  61 #include <lwres/netdb.h>
  62 #include <lwres/platform.h>
  63
  64 LIBLWRES_EXTERNAL_DATA int      lwres_h_errno;
  65
  66 /*
  67  * these have never been declared in any header file so make them static
  68  */
  69
  70 static const char *h_errlist[] = {
  71         "Resolver Error 0 (no error)",
  72         "Unknown host",                         /* 1 HOST_NOT_FOUND */
  73         "Host name lookup failure",             /* 2 TRY_AGAIN */
  74         "Unknown server error",                 /* 3 NO_RECOVERY */
  75         "No address associated with name",      /* 4 NO_ADDRESS */
  76 };
  77
  78 static int      h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
  79
  80
  81 /*
  82  * herror --
  83  *      print the error indicated by the h_errno value.
  84  */
  85 void
  86 lwres_herror(const char *s) {
  87         fprintf(stderr, "%s: %s\n", s, lwres_hstrerror(lwres_h_errno));
  88 }
  89
  90 /*
  91  * hstrerror --
  92  *      return the string associated with a given "host" errno value.
  93  */
  94 const char *
  95 lwres_hstrerror(int err) {
  96         if (err < 0)
  97                 return ("Resolver internal error");
  98         else if (err < h_nerr)
  99                 return (h_errlist[err]);
 100         return ("Unknown resolver error");
 101 }