dns.subproj/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: herror.c,v 1.4 2003/04/10 20:21:16 majka Exp $";
  59 #endif /* LIBC_SCCS and not lint */
  60
  61 #include <sys/param.h>
  62 #include <sys/uio.h>
  63 #include <netdb.h>
  64 #include <string.h>
  65 #include <unistd.h>
  66
  67 const char * const h_errlist[] = {
  68         "Resolver Error 0 (no error)",
  69         "Unknown host",                         /* 1 HOST_NOT_FOUND */
  70         "Host name lookup failure",             /* 2 TRY_AGAIN */
  71         "Unknown server error",                 /* 3 NO_RECOVERY */
  72         "No address associated with name",      /* 4 NO_ADDRESS */
  73 };
  74 const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
  75
  76 int h_errno;
  77
  78 /*
  79  * herror --
  80  *      print the error indicated by the h_errno value.
  81  */
  82 void
  83 herror(const char *s)
  84 {
  85         struct iovec iov[4];
  86         register struct iovec *v = iov;
  87
  88         if (s && *s) {
  89                 v->iov_base = (char *)s;
  90                 v->iov_len = strlen(s);
  91                 v++;
  92                 v->iov_base = ": ";
  93                 v->iov_len = 2;
  94                 v++;
  95         }
  96         v->iov_base = (char *)hstrerror(h_errno);
  97         v->iov_len = strlen(v->iov_base);
  98         v++;
  99         v->iov_base = "\n";
 100         v->iov_len = 1;
 101         writev(STDERR_FILENO, iov, (v - iov) + 1);
 102 }
 103
 104 const char *
 105 hstrerror(int err)
 106 {
 107         if (err < 0)
 108                 return ("Resolver internal error");
 109         else if (err < h_nerr)
 110                 return ((char *)h_errlist[err]);
 111         return ("Unknown resolver error");
 112 }