1/*	$NetBSD: herror.c,v 1.10 2015/02/24 17:56:20 christos Exp $	*/
2
3/*
4 * Copyright (c) 1987, 1993
5 *    The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32/*
33 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
34 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
35 *
36 * Permission to use, copy, modify, and distribute this software for any
37 * purpose with or without fee is hereby granted, provided that the above
38 * copyright notice and this permission notice appear in all copies.
39 *
40 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
41 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
42 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
43 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
44 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
45 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
46 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
47 */
48
49#if defined(LIBC_SCCS) && !defined(lint)
50static const char sccsid[] = "@(#)herror.c	8.1 (Berkeley) 6/4/93";
51static const char rcsid[] = "$Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp $";
52#endif /* LIBC_SCCS and not lint */
53
54#include "port_before.h"
55
56#include <sys/types.h>
57#include <sys/param.h>
58#include <sys/uio.h>
59
60#include <netinet/in.h>
61#include <arpa/nameser.h>
62
63#include <netdb.h>
64#include <resolv.h>
65#include <string.h>
66#include <unistd.h>
67
68#include "port_after.h"
69
70const char *h_errlist[] = {
71	"Resolver Error 0 (no error)",
72	"Unknown host",				/*%< 1 HOST_NOT_FOUND */
73	"Host name lookup failure",		/*%< 2 TRY_AGAIN */
74	"Unknown server error",			/*%< 3 NO_RECOVERY */
75	"No address associated with name",	/*%< 4 NO_ADDRESS */
76};
77int	h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
78
79#if !(__GLIBC__ > 2 || __GLIBC__ == 2 &&  __GLIBC_MINOR__ >= 3)
80#undef	h_errno
81int	h_errno;
82#endif
83
84#ifdef __weak_alias
85__weak_alias(herror,_herror)
86#endif
87
88/*%
89 * herror --
90 *	print the error indicated by the h_errno value.
91 */
92void
93herror(const char *s) {
94	struct iovec iov[4], *v = iov;
95	char *t;
96
97	if (s != NULL && *s != '\0') {
98		DE_CONST(s, t);
99		v->iov_base = t;
100		v->iov_len = strlen(t);
101		v++;
102		DE_CONST(": ", t);
103		v->iov_base = t;
104		v->iov_len = 2;
105		v++;
106	}
107	DE_CONST(hstrerror(*__h_errno()), t);
108	v->iov_base = t;
109	v->iov_len = strlen(v->iov_base);
110	v++;
111	DE_CONST("\n", t);
112	v->iov_base = t;
113	v->iov_len = 1;
114	(void)writev(STDERR_FILENO, iov, (int)((v - iov) + 1));
115}
116
117/*%
118 * hstrerror --
119 *	return the string associated with a given "host" errno value.
120 */
121const char *
122hstrerror(int err) {
123	if (err < 0)
124		return ("Resolver internal error");
125	else if (err < h_nerr)
126		return (h_errlist[err]);
127	return ("Unknown resolver error");
128}
129
130/*! \file */
131