dns.subproj/herror.c

   1 /*
   2  * Copyright (c) 2018 Apple Inc. All rights reserved.
   3  */
   4 /*
   5  * ++Copyright++ 1987, 1993
   6  * -
   7  * Copyright (c) 1987, 1993
   8  *    The Regents of the University of California.  All rights reserved.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. All advertising materials mentioning features or use of this software
  19  *    must display the following acknowledgement:
  20  *      This product includes software developed by the University of
  21  *      California, Berkeley and its contributors.
  22  * 4. Neither the name of the University nor the names of its contributors
  23  *    may be used to endorse or promote products derived from this software
  24  *    without specific prior written permission.
  25  *
  26  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  27  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  28  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  29  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  30  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  31  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  32  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  33  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  34  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  35  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  36  * SUCH DAMAGE.
  37  * -
  38  * Portions Copyright (c) 1993 by Digital Equipment Corporation.
  39  *
  40  * Permission to use, copy, modify, and distribute this software for any
  41  * purpose with or without fee is hereby granted, provided that the above
  42  * copyright notice and this permission notice appear in all copies, and that
  43  * the name of Digital Equipment Corporation not be used in advertising or
  44  * publicity pertaining to distribution of the document or software without
  45  * specific, written prior permission.
  46  *
  47  * THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
  48  * WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
  49  * OF MERCHANTABILITY AND FITNESS.   IN NO EVENT SHALL DIGITAL EQUIPMENT
  50  * CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  51  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  52  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  53  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  54  * SOFTWARE.
  55  * -
  56  * --Copyright--
  57  */
  58
  59 #if defined(LIBC_SCCS) && !defined(lint)
  60 static char sccsid[] = "@(#)herror.c    8.1 (Berkeley) 6/4/93";
  61 static char rcsid[] = "$Id: herror.c,v 1.4 2003/04/10 20:21:16 majka Exp $";
  62 #endif /* LIBC_SCCS and not lint */
  63
  64 #include "libinfo_common.h"
  65
  66 #include <sys/param.h>
  67 #include <sys/uio.h>
  68 #include <netdb.h>
  69 #include <string.h>
  70 #include <unistd.h>
  71
  72 const char * const h_errlist[] = {
  73         "Resolver Error 0 (no error)",
  74         "Unknown host",                         /* 1 HOST_NOT_FOUND */
  75         "Host name lookup failure",             /* 2 TRY_AGAIN */
  76         "Unknown server error",                 /* 3 NO_RECOVERY */
  77         "No address associated with name",      /* 4 NO_ADDRESS */
  78 };
  79 const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
  80
  81 LIBINFO_EXPORT
  82 int h_errno;
  83
  84 /*
  85  * herror --
  86  *      print the error indicated by the h_errno value.
  87  */
  88 LIBINFO_EXPORT
  89 void
  90 herror(const char *s)
  91 {
  92         struct iovec iov[4];
  93         register struct iovec *v = iov;
  94
  95         if (s && *s) {
  96                 v->iov_base = (char *)s;
  97                 v->iov_len = strlen(s);
  98                 v++;
  99                 v->iov_base = ": ";
 100                 v->iov_len = 2;
 101                 v++;
 102         }
 103         v->iov_base = (char *)hstrerror(h_errno);
 104         v->iov_len = strlen(v->iov_base);
 105         v++;
 106         v->iov_base = "\n";
 107         v->iov_len = 1;
 108         writev(STDERR_FILENO, iov, (v - iov) + 1);
 109 }
 110
 111 LIBINFO_EXPORT
 112 const char *
 113 hstrerror(int err)
 114 {
 115         if (err < 0)
 116                 return ("Resolver internal error");
 117         else if (err < h_nerr)
 118                 return ((char *)h_errlist[err]);
 119         return ("Unknown resolver error");
 120 }