lib/libc/resolv/herror.c

   1 /*      $NetBSD: herror.c,v 1.9 2012/03/13 21:13:43 christos Exp $      */
   2
   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
  36 /*
  37  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  38  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  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.
  43  *
  44  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  45  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  46  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  47  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  48  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  49  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  50  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  51  */
  52
  53 #include <sys/cdefs.h>
  54 #if defined(LIBC_SCCS) && !defined(lint)
  55 #ifdef notdef
  56 static const char sccsid[] = "@(#)herror.c      8.1 (Berkeley) 6/4/93";
  57 static const char rcsid[] = "Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp";
  58 #else
  59 __RCSID("$NetBSD: herror.c,v 1.9 2012/03/13 21:13:43 christos Exp $");
  60 #endif
  61 #endif /* LIBC_SCCS and not lint */
  62
  63 #include "port_before.h"
  64
  65 #include "namespace.h"
  66 #include <sys/types.h>
  67 #include <sys/param.h>
  68 #include <sys/uio.h>
  69
  70 #include <netinet/in.h>
  71 #include <arpa/nameser.h>
  72
  73 #include <netdb.h>
  74 #include <resolv.h>
  75 #include <string.h>
  76 #include <unistd.h>
  77
  78 #include "port_after.h"
  79
  80 const char *h_errlist[] = {
  81         "Resolver Error 0 (no error)",
  82         "Unknown host",                         /*%< 1 HOST_NOT_FOUND */
  83         "Host name lookup failure",             /*%< 2 TRY_AGAIN */
  84         "Unknown server error",                 /*%< 3 NO_RECOVERY */
  85         "No address associated with name",      /*%< 4 NO_ADDRESS */
  86 };
  87 int     h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
  88
  89 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
  90 #undef  h_errno
  91 int     h_errno;
  92 #endif
  93
  94 #ifdef __weak_alias
  95 __weak_alias(herror,_herror)
  96 #endif
  97
  98 /*%
  99  * herror --
 100  *      print the error indicated by the h_errno value.
 101  */
 102 void
 103 herror(const char *s) {
 104         struct iovec iov[4], *v = iov;
 105         char *t;
 106
 107         if (s != NULL && *s != '\0') {
 108                 DE_CONST(s, t);
 109                 v->iov_base = t;
 110                 v->iov_len = strlen(t);
 111                 v++;
 112                 DE_CONST(": ", t);
 113                 v->iov_base = t;
 114                 v->iov_len = 2;
 115                 v++;
 116         }
 117         DE_CONST(hstrerror(*__h_errno()), t);
 118         v->iov_base = t;
 119         v->iov_len = strlen(v->iov_base);
 120         v++;
 121         DE_CONST("\n", t);
 122         v->iov_base = t;
 123         v->iov_len = 1;
 124         (void)writev(STDERR_FILENO, iov, (int)((v - iov) + 1));
 125 }
 126
 127 /*%
 128  * hstrerror --
 129  *      return the string associated with a given "host" errno value.
 130  */
 131 const char *
 132 hstrerror(int err) {
 133         if (err < 0)
 134                 return ("Resolver internal error");
 135         else if (err < h_nerr)
 136                 return (h_errlist[err]);
 137         return ("Unknown resolver error");
 138 }
 139
 140 /*! \file */