src/kits/network/netresolv/resolv/herror.c

   1 /*      $NetBSD: herror.c,v 1.10 2015/02/24 17:56:20 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. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 /*
  33  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  34  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  35  *
  36  * Permission to use, copy, modify, and distribute this software for any
  37  * purpose with or without fee is hereby granted, provided that the above
  38  * copyright notice and this permission notice appear in all copies.
  39  *
  40  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  41  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  42  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  43  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  44  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  45  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  46  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  47  */
  48
  49 #if defined(LIBC_SCCS) && !defined(lint)
  50 static const char sccsid[] = "@(#)herror.c      8.1 (Berkeley) 6/4/93";
  51 static const char rcsid[] = "$Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp $";
  52 #endif /* LIBC_SCCS and not lint */
  53
  54 #include "port_before.h"
  55
  56 #include <sys/types.h>
  57 #include <sys/param.h>
  58 #include <sys/uio.h>
  59
  60 #include <netinet/in.h>
  61 #include <arpa/nameser.h>
  62
  63 #include <netdb.h>
  64 #include <resolv.h>
  65 #include <string.h>
  66 #include <unistd.h>
  67
  68 #include "port_after.h"
  69
  70 const char *h_errlist[] = {
  71         "Resolver Error 0 (no error)",
  72         "Unknown host",                         /*%< 1 HOST_NOT_FOUND */
  73         "Host name lookup failure",             /*%< 2 TRY_AGAIN */
  74         "Unknown server error",                 /*%< 3 NO_RECOVERY */
  75         "No address associated with name",      /*%< 4 NO_ADDRESS */
  76 };
  77 int     h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
  78
  79 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
  80 #undef  h_errno
  81 int     h_errno;
  82 #endif
  83
  84 #ifdef __weak_alias
  85 __weak_alias(herror,_herror)
  86 #endif
  87
  88 /*%
  89  * herror --
  90  *      print the error indicated by the h_errno value.
  91  */
  92 void
  93 herror(const char *s) {
  94         struct iovec iov[4], *v = iov;
  95         char *t;
  96
  97         if (s != NULL && *s != '\0') {
  98                 DE_CONST(s, t);
  99                 v->iov_base = t;
 100                 v->iov_len = strlen(t);
 101                 v++;
 102                 DE_CONST(": ", t);
 103                 v->iov_base = t;
 104                 v->iov_len = 2;
 105                 v++;
 106         }
 107         DE_CONST(hstrerror(*__h_errno()), t);
 108         v->iov_base = t;
 109         v->iov_len = strlen(v->iov_base);
 110         v++;
 111         DE_CONST("\n", t);
 112         v->iov_base = t;
 113         v->iov_len = 1;
 114         (void)writev(STDERR_FILENO, iov, (int)((v - iov) + 1));
 115 }
 116
 117 /*%
 118  * hstrerror --
 119  *      return the string associated with a given "host" errno value.
 120  */
 121 const char *
 122 hstrerror(int err) {
 123         if (err < 0)
 124                 return ("Resolver internal error");
 125         else if (err < h_nerr)
 126                 return (h_errlist[err]);
 127         return ("Unknown resolver error");
 128 }
 129
 130 /*! \file */