1/*	$NetBSD: herror.c,v 1.4 2004/05/23 05:09:52 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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 * 	This product includes software developed by the University of
18 * 	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36/*
37 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
38 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
39 *
40 * Permission to use, copy, modify, and distribute this software for any
41 * purpose with or without fee is hereby granted, provided that the above
42 * copyright notice and this permission notice appear in all copies.
43 *
44 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
45 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
46 * MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL ISC BE LIABLE FOR
47 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
48 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
49 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
50 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
51 */
52
53#include <sys/cdefs.h>
54#if defined(LIBC_SCCS) && !defined(lint)
55#ifdef notdef
56static const char sccsid[] = "@(#)herror.c	8.1 (Berkeley) 6/4/93";
57static const char rcsid[] = "Id: herror.c,v 1.2.206.1 2004/03/09 08:33:54 marka Exp";
58#else
59__RCSID("$NetBSD: herror.c,v 1.4 2004/05/23 05:09:52 christos Exp $");
60#endif
61#endif /* LIBC_SCCS and not lint */
62
63#include <sys/types.h>
64#include <sys/param.h>
65#include <sys/uio.h>
66
67#include <netinet/in.h>
68#include <arpa/nameser.h>
69
70#include <netdb.h>
71#ifdef ANDROID_CHANGES
72#include "resolv_private.h"
73#else
74#include <resolv.h>
75#endif
76#include <string.h>
77#include <unistd.h>
78
79#ifndef DE_CONST
80#define DE_CONST(c,v)   v = ((c) ? \
81    strchr((const void *)(c), *(const char *)(const void *)(c)) : NULL)
82#endif
83
84const char * const h_errlist[] = {
85	"Resolver Error 0 (no error)",
86	"Unknown host",				/* 1 HOST_NOT_FOUND */
87	"Host name lookup failure",		/* 2 TRY_AGAIN */
88	"Unknown server error",			/* 3 NO_RECOVERY */
89	"No address associated with name",	/* 4 NO_ADDRESS */
90};
91const int	h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
92
93/*
94 * herror --
95 *	print the error indicated by the h_errno value.
96 */
97void
98herror(const char *s) {
99	struct iovec iov[4], *v = iov;
100	char *t;
101
102	if (s != NULL && *s != '\0') {
103		DE_CONST(s, t);
104		v->iov_base = t;
105		v->iov_len = strlen(t);
106		v++;
107		DE_CONST(": ", t);
108		v->iov_base = t;
109		v->iov_len = 2;
110		v++;
111	}
112	DE_CONST(hstrerror(h_errno), t);
113	v->iov_base = t;
114	v->iov_len = strlen(v->iov_base);
115	v++;
116	DE_CONST("\n", t);
117	v->iov_base = t;
118	v->iov_len = 1;
119	writev(STDERR_FILENO, iov, (v - iov) + 1);
120}
121
122/*
123 * hstrerror --
124 *	return the string associated with a given "host" errno value.
125 */
126const char *
127hstrerror(int err) {
128	if (err < 0)
129		return ("Resolver internal error");
130	else if (err < h_nerr)
131		return (h_errlist[err]);
132	return ("Unknown resolver error");
133}
134