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      1 /*
      2  * Copyright (c) 1987, 1993
      3  *  The Regents of the University of California.  All rights reserved.
      4  *
      5  * Portions copyright (c) 1999, 2000
      6  * Intel Corporation.
      7  * All rights reserved.
      8  *
      9  * Redistribution and use in source and binary forms, with or without
     10  * modification, are permitted provided that the following conditions
     11  * are met:
     12  *
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  *
     16  * 2. Redistributions in binary form must reproduce the above copyright
     17  *    notice, this list of conditions and the following disclaimer in the
     18  *    documentation and/or other materials provided with the distribution.
     19  *
     20  * 3. All advertising materials mentioning features or use of this software
     21  *    must display the following acknowledgement:
     22  *
     23  *    This product includes software developed by the University of
     24  *    California, Berkeley, Intel Corporation, and its contributors.
     25  *
     26  * 4. Neither the name of University, Intel Corporation, or their respective
     27  *    contributors may be used to endorse or promote products derived from
     28  *    this software without specific prior written permission.
     29  *
     30  * THIS SOFTWARE IS PROVIDED BY THE REGENTS, INTEL CORPORATION AND
     31  * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING,
     32  * BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
     33  * FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS,
     34  * INTEL CORPORATION OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
     35  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
     36  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     37  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     38  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     39  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
     40  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     41  *
     42  */
     43 
     44 /*
     45  * Portions Copyright (c) 1996 by Internet Software Consortium.
     46  *
     47  * Permission to use, copy, modify, and distribute this software for any
     48  * purpose with or without fee is hereby granted, provided that the above
     49  * copyright notice and this permission notice appear in all copies.
     50  *
     51  * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
     52  * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
     53  * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
     54  * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
     55  * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
     56  * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
     57  * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
     58  * SOFTWARE.
     59 
     60   herror.c  8.1 (Berkeley) 6/4/93
     61   herror.c,v 1.1.1.1 2003/11/19 01:51:28 kyu3 Exp
     62  */
     63 
     64 #include <sys/types.h>
     65 #include <sys/uio.h>
     66 #include <netdb.h>
     67 #include <string.h>
     68 #include <stdio.h>
     69 #include <unistd.h>
     70 
     71 const char *h_errlist[] = {
     72   "Resolver Error 0 (no error)",
     73   "Unknown host",       /* 1 HOST_NOT_FOUND */
     74   "Host name lookup failure",   /* 2 TRY_AGAIN */
     75   "Unknown server error",     /* 3 NO_RECOVERY */
     76   "No address associated with name",  /* 4 NO_ADDRESS */
     77 };
     78 int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
     79 
     80 int h_errno;
     81 
     82 const char *
     83 hstrerror(
     84   int err
     85   );
     86 
     87 /*
     88  * herror --
     89  *  print the error indicated by the h_errno value.
     90  */
     91 void
     92 herror(
     93   const char *s
     94   )
     95 {
     96   struct iovec iov[4];
     97   register struct iovec *v = iov;
     98 
     99   if (s && *s) {
    100     v->iov_base = (char *)s;
    101     v->iov_len = strlen(s);
    102     v++;
    103     v->iov_base = ": ";
    104     v->iov_len = 2;
    105     v++;
    106   }
    107   v->iov_base = (char *)hstrerror(h_errno);
    108   v->iov_len = strlen(v->iov_base);
    109   v++;
    110   v->iov_base = "\n";
    111   v->iov_len = 1;
    112 #if defined(_ORG_FREEBSD_) || defined(__GNUC__)
    113   writev(STDERR_FILENO, iov, (v - iov) + 1);
    114 #else
    115   {
    116     int   i;
    117     for (i = 0; i < (v - iov) + 1; i++)
    118       fprintf( stderr, iov[i].iov_base);
    119   }
    120 #endif
    121 
    122 }
    123 
    124 const char *
    125 hstrerror(
    126   int err
    127   )
    128 {
    129   if (err < 0)
    130     return ("Resolver internal error");
    131   else if (err < h_nerr)
    132     return (h_errlist[err]);
    133   return ("Unknown resolver error");
    134 }
    135