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/* $OpenBSD: herror.c,v 1.9 2015/01/16 16:48:51 deraadt Exp $ */
/*
* ++Copyright++ 1987, 1993
* -
* Copyright (c) 1987, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
* -
* Portions Copyright (c) 1993 by Digital Equipment Corporation.
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies, and that
* the name of Digital Equipment Corporation not be used in advertising or
* publicity pertaining to distribution of the document or software without
* specific, written prior permission.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND DIGITAL EQUIPMENT CORP. DISCLAIMS ALL
* WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL DIGITAL EQUIPMENT
* CORPORATION BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
* DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
* PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
* ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
* SOFTWARE.
* -
* --Copyright--
*/
#include <sys/types.h>
#include <sys/uio.h>
#include <netdb.h>
#include <unistd.h>
#include <string.h>
const char * const h_errlist[] = {
"Resolver Error 0 (no error)",
"Unknown host", /* 1 HOST_NOT_FOUND */
"Host name lookup failure", /* 2 TRY_AGAIN */
"Unknown server error", /* 3 NO_RECOVERY */
"No address associated with name", /* 4 NO_ADDRESS */
};
const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
extern int h_errno;
/*
* herror --
* print the error indicated by the h_errno value.
*/
void
herror(const char *s)
{
struct iovec iov[4];
struct iovec *v = iov;
if (s && *s) {
v->iov_base = (char *)s;
v->iov_len = strlen(s);
v++;
v->iov_base = ": ";
v->iov_len = 2;
v++;
}
v->iov_base = (char *)hstrerror(h_errno);
v->iov_len = strlen(v->iov_base);
v++;
v->iov_base = "\n";
v->iov_len = 1;
writev(STDERR_FILENO, iov, (v - iov) + 1);
}
const char *
hstrerror(int err)
{
if (err < 0)
return ("Resolver internal error");
else if (err < h_nerr)
return (h_errlist[err]);
return ("Unknown resolver error");
}
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