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 #include <sys/types.h>
  48 #include <sys/param.h>
  49 #include <sys/uio.h>
  50
  51 #include <netinet/in.h>
  52 #include <arpa/nameser.h>
  53
  54 #include <netdb.h>
  55 #include <resolv.h>
  56 #include <string.h>
  57 #include <unistd.h>
  58
  59 #include <libintl.h>
  60 #include <not-cancel.h>
  61
  62 const char *const h_errlist[] = {
  63         N_("Resolver Error 0 (no error)"),
  64         N_("Unknown host"),                     /* 1 HOST_NOT_FOUND */
  65         N_("Host name lookup failure"),         /* 2 TRY_AGAIN */
  66         N_("Unknown server error"),             /* 3 NO_RECOVERY */
  67         N_("No address associated with name"),  /* 4 NO_ADDRESS */
  68 };
  69 const int       h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
  70
  71 /*
  72  * herror --
  73  *      print the error indicated by the h_errno value.
  74  */
  75 void
  76 herror(const char *s) {
  77         struct iovec iov[4], *v = iov;
  78
  79         if (s != NULL && *s != '\0') {
  80                 v->iov_base = (/*noconst*/ char *)s;
  81                 v->iov_len = strlen(s);
  82                 v++;
  83                 v->iov_base = (char *) ": ";
  84                 v->iov_len = 2;
  85                 v++;
  86         }
  87         v->iov_base = (char *)hstrerror(h_errno);
  88         v->iov_len = strlen(v->iov_base);
  89         v++;
  90         v->iov_base = (char *) "\n";
  91         v->iov_len = 1;
  92         __writev_nocancel_nostatus(STDERR_FILENO, iov, (v - iov) + 1);
  93 }
  94
  95 /*
  96  * hstrerror --
  97  *      return the string associated with a given "host" errno value.
  98  */
  99 const char *
 100 hstrerror(int err) {
 101         if (err < 0)
 102                 return _("Resolver internal error");
 103         else if (err < h_nerr)
 104                 return _(h_errlist[err]);
 105         return _("Unknown resolver error");
 106 }
 107 libc_hidden_def (hstrerror)