contrib/bind-9.2.4rc7/lib/bind/resolv/herror.c

   1 /*
   2  * Copyright (c) 1987, 1993
   3  *    The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
  36  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  37  *
  38  * Permission to use, copy, modify, and distribute this software for any
  39  * purpose with or without fee is hereby granted, provided that the above
  40  * copyright notice and this permission notice appear in all copies.
  41  *
  42  * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
  43  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  44  * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
  45  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  46  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  47  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
  48  * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
  49  */
  50
  51 #if defined(LIBC_SCCS) && !defined(lint)
  52 static const char sccsid[] = "@(#)herror.c      8.1 (Berkeley) 6/4/93";
  53 static const char rcsid[] = "$Id: herror.c,v 1.2.2.1 2004/03/09 09:17:48 marka Exp $";
  54 #endif /* LIBC_SCCS and not lint */
  55
  56 #include "port_before.h"
  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 #include <irs.h>
  70
  71 #include "port_after.h"
  72
  73 const char *h_errlist[] = {
  74         "Resolver Error 0 (no error)",
  75         "Unknown host",                         /* 1 HOST_NOT_FOUND */
  76         "Host name lookup failure",             /* 2 TRY_AGAIN */
  77         "Unknown server error",                 /* 3 NO_RECOVERY */
  78         "No address associated with name",      /* 4 NO_ADDRESS */
  79 };
  80 int     h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
  81
  82 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
  83 #undef  h_errno
  84 int     h_errno;
  85 #endif
  86
  87 /*
  88  * herror --
  89  *      print the error indicated by the h_errno value.
  90  */
  91 void
  92 herror(const char *s) {
  93         struct iovec iov[4], *v = iov;
  94         char *t;
  95
  96         if (s != NULL && *s != '\0') {
  97                 DE_CONST(s, t);
  98                 v->iov_base = t;
  99                 v->iov_len = strlen(t);
 100                 v++;
 101                 DE_CONST(": ", t);
 102                 v->iov_base = t;
 103                 v->iov_len = 2;
 104                 v++;
 105         }
 106         DE_CONST(hstrerror(*__h_errno()), t);
 107         v->iov_base = t;
 108         v->iov_len = strlen(v->iov_base);
 109         v++;
 110         DE_CONST("\n", t);
 111         v->iov_base = t;
 112         v->iov_len = 1;
 113         writev(STDERR_FILENO, iov, (v - iov) + 1);
 114 }
 115
 116 /*
 117  * hstrerror --
 118  *      return the string associated with a given "host" errno value.
 119  */
 120 const char *
 121 hstrerror(int err) {
 122         if (err < 0)
 123                 return ("Resolver internal error");
 124         else if (err < h_nerr)
 125                 return (h_errlist[err]);
 126         return ("Unknown resolver error");
 127 }