resolv/herror.c

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