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