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)