dns.subproj/herror.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * ++Copyright++ 1987, 1993
  27  * -
  28  * Copyright (c) 1987, 1993
  29  *    The Regents of the University of California.  All rights reserved.
  30  *
  31  * Redistribution and use in source and binary forms, with or without
  32  * modification, are permitted provided that the following conditions
  33  * are met:
  34  * 1. Redistributions of source code must retain the above copyright
  35  *    notice, this list of conditions and the following disclaimer.
  36  * 2. Redistributions in binary form must reproduce the above copyright
  37  *    notice, this list of conditions and the following disclaimer in the
  38  *    documentation and/or other materials provided with the distribution.
  39  * 3. All advertising materials mentioning features or use of this software
  40  *    must display the following acknowledgement:
  41  *      This product includes software developed by the University of
  42  *      California, Berkeley and its contributors.
  43  * 4. Neither the name of the University nor the names of its contributors
  44  *    may be used to endorse or promote products derived from this software
  45  *    without specific prior written permission.
  46  *
  47  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  48  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  49  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  50  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  51  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  52  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  53  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  54  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  55  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  56  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  57  * SUCH DAMAGE.
  58  * -
  59  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  60  *
  61  * Permission to use, copy, modify, and distribute this software for any
  62  * purpose with or without fee is hereby granted, provided that the above
  63  * copyright notice and this permission notice appear in all copies, and that
  64  * the name of Digital Equipment Corporation not be used in advertising or
  65  * publicity pertaining to distribution of the document or software without
  66  * specific, written prior permission.
  67  *
  68  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  69  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  70  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  71  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  72  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  73  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  74  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  75  * SOFTWARE.
  76  * -
  77  * --Copyright--
  78  */
  79
  80 #if defined(LIBC_SCCS) && !defined(lint)
  81 static char sccsid[] = "@(#)herror.c    8.1 (Berkeley) 6/4/93";
  82 static char rcsid[] = "$Id: herror.c,v 1.4 2003/04/10 20:21:16 majka Exp $";
  83 #endif /* LIBC_SCCS and not lint */
  84
  85 #include <sys/param.h>
  86 #include <sys/uio.h>
  87 #include <netdb.h>
  88 #if defined(BSD) && (BSD >= 199103)
  89 # include <unistd.h>
  90 # include <string.h>
  91 #else
  92 # include "portability.h"
  93 #endif
  94
  95 const char *h_errlist[] = {
  96         "Resolver Error 0 (no error)",
  97         "Unknown host",                         /* 1 HOST_NOT_FOUND */
  98         "Host name lookup failure",             /* 2 TRY_AGAIN */
  99         "Unknown server error",                 /* 3 NO_RECOVERY */
 100         "No address associated with name",      /* 4 NO_ADDRESS */
 101 };
 102 int     h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
 103
 104 #if defined(__APPLE__)
 105 int     h_errno = 0;
 106 #else
 107 extern int      h_errno;
 108 #endif /* !NeXT */
 109
 110 /*
 111  * herror --
 112  *      print the error indicated by the h_errno value.
 113  */
 114 void
 115 herror(s)
 116         const char *s;
 117 {
 118         struct iovec iov[4];
 119         register struct iovec *v = iov;
 120
 121         if (s && *s) {
 122                 v->iov_base = (char *)s;
 123                 v->iov_len = strlen(s);
 124                 v++;
 125                 v->iov_base = ": ";
 126                 v->iov_len = 2;
 127                 v++;
 128         }
 129         v->iov_base = (char *)hstrerror(h_errno);
 130         v->iov_len = strlen(v->iov_base);
 131         v++;
 132         v->iov_base = "\n";
 133         v->iov_len = 1;
 134         writev(STDERR_FILENO, iov, (v - iov) + 1);
 135 }
 136
 137 const char *
 138 hstrerror(err)
 139         int err;
 140 {
 141         if (err < 0)
 142                 return ("Resolver internal error");
 143         else if (err < h_nerr)
 144                 return ((char *)h_errlist[err]);
 145         return ("Unknown resolver error");
 146 }