lib/libc/resolv/herror.c

   1 /*
   2  * @(#)herror.c 8.1 (Berkeley) 6/4/93
   3  * $Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp $
   4  */
   5
   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. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 /*
  36  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  37  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  38  *
  39  * Permission to use, copy, modify, and distribute this software for any
  40  * purpose with or without fee is hereby granted, provided that the above
  41  * copyright notice and this permission notice appear in all copies.
  42  *
  43  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  44  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  45  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  46  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  47  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  48  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  49  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  50  */
  51
  52 #include "port_before.h"
  53
  54 #ifdef _LIBC
  55 #include "namespace.h"
  56 #endif
  57
  58 #include <sys/types.h>
  59 #include <sys/param.h>
  60 #include <sys/uio.h>
  61
  62 #include <netinet/in.h>
  63 #include <arpa/nameser.h>
  64
  65 #include <netdb.h>
  66 #include <resolv.h>
  67 #include <string.h>
  68 #include <unistd.h>
  69 #ifndef _LIBC
  70 #include <irs.h>
  71 #else
  72 #include "un-namespace.h"
  73 #endif
  74
  75 #include "port_after.h"
  76
  77 const char *h_errlist[] = {
  78         "Resolver Error 0 (no error)",
  79         "Unknown host",                         /*%< 1 HOST_NOT_FOUND */
  80         "Host name lookup failure",             /*%< 2 TRY_AGAIN */
  81         "Unknown server error",                 /*%< 3 NO_RECOVERY */
  82         "No address associated with name",      /*%< 4 NO_ADDRESS */
  83 };
  84 int     h_nerr = { NELEM(h_errlist) };
  85
  86 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
  87 #undef  h_errno
  88 int     h_errno;
  89 #endif
  90
  91 /*%
  92  * herror --
  93  *      print the error indicated by the h_errno value.
  94  */
  95 void
  96 herror(const char *s) {
  97         struct iovec iov[4], *v = iov;
  98         char *t;
  99
 100         if (s != NULL && *s != '\0') {
 101                 DE_CONST(s, t);
 102                 v->iov_base = t;
 103                 v->iov_len = strlen(t);
 104                 v++;
 105                 DE_CONST(": ", t);
 106                 v->iov_base = t;
 107                 v->iov_len = 2;
 108                 v++;
 109         }
 110         DE_CONST(hstrerror(*__h_errno()), t);
 111         v->iov_base = t;
 112         v->iov_len = strlen(v->iov_base);
 113         v++;
 114         DE_CONST("\n", t);
 115         v->iov_base = t;
 116         v->iov_len = 1;
 117 #ifndef _LIBC
 118         writev(STDERR_FILENO, iov, (v - iov) + 1);
 119 #else
 120         _writev(STDERR_FILENO, iov, (v - iov) + 1);
 121 #endif
 122 }
 123
 124 /*%
 125  * hstrerror --
 126  *      return the string associated with a given "host" errno value.
 127  */
 128 const char *
 129 hstrerror(int err) {
 130         if (err < 0)
 131                 return ("Resolver internal error");
 132         else if (err < h_nerr)
 133                 return (h_errlist[err]);
 134         return ("Unknown resolver error");
 135 }
 136
 137 /*! \file */