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  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  */
  29
  30 /*
  31  * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
  32  *
  33  * Permission to use, copy, modify, and distribute this software for any
  34  * purpose with or without fee is hereby granted, provided that the above
  35  * copyright notice and this permission notice appear in all copies.
  36  *
  37  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
  38  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
  39  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
  40  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
  41  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
  42  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
  43  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
  44  * SOFTWARE.
  45  */
  46
  47 #if defined(LIBC_SCCS) && !defined(lint)
  48 static const char sccsid[] = "@(#)herror.c      8.1 (Berkeley) 6/4/93";
  49 static const char rcsid[] = "$BINDId: herror.c,v 8.11 1999/10/13 16:39:39 vixie Exp $";
  50 #endif /* LIBC_SCCS and not lint */
  51
  52 #include <sys/types.h>
  53 #include <sys/param.h>
  54 #include <sys/uio.h>
  55
  56 #include <netinet/in.h>
  57 #include <arpa/nameser.h>
  58
  59 #include <netdb.h>
  60 #include <resolv.h>
  61 #include <string.h>
  62 #include <unistd.h>
  63
  64 #include <libintl.h>
  65 #include <not-cancel.h>
  66
  67 const char *const h_errlist[] = {
  68         N_("Resolver Error 0 (no error)"),
  69         N_("Unknown host"),                     /* 1 HOST_NOT_FOUND */
  70         N_("Host name lookup failure"),         /* 2 TRY_AGAIN */
  71         N_("Unknown server error"),             /* 3 NO_RECOVERY */
  72         N_("No address associated with name"),  /* 4 NO_ADDRESS */
  73 };
  74 const int       h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
  75
  76 /*
  77  * herror --
  78  *      print the error indicated by the h_errno value.
  79  */
  80 void
  81 herror(const char *s) {
  82         struct iovec iov[4], *v = iov;
  83
  84         if (s != NULL && *s != '\0') {
  85                 v->iov_base = (/*noconst*/ char *)s;
  86                 v->iov_len = strlen(s);
  87                 v++;
  88                 v->iov_base = ": ";
  89                 v->iov_len = 2;
  90                 v++;
  91         }
  92         v->iov_base = (char *)hstrerror(h_errno);
  93         v->iov_len = strlen(v->iov_base);
  94         v++;
  95         v->iov_base = "\n";
  96         v->iov_len = 1;
  97         writev_not_cancel_no_status(STDERR_FILENO, iov, (v - iov) + 1);
  98 }
  99
 100 /*
 101  * hstrerror --
 102  *      return the string associated with a given "host" errno value.
 103  */
 104 const char *
 105 hstrerror(int err) {
 106         if (err < 0)
 107                 return _("Resolver internal error");
 108         else if (err < h_nerr)
 109                 return _(h_errlist[err]);
 110         return _("Unknown resolver error");
 111 }
 112 libc_hidden_def (hstrerror)