1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
|
/*
* Portions Copyright (C) Internet Systems Consortium, Inc. ("ISC")
*
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/.
*
* See the COPYRIGHT file distributed with this work for additional
* information regarding copyright ownership.
*/
/*
* 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.
*/
/*! \file herror.c
lwres_herror() prints the string s on stderr followed by the string
generated by lwres_hstrerror() for the error code stored in the global
variable lwres_h_errno.
lwres_hstrerror() returns an appropriate string for the error code
gievn by err. The values of the error codes and messages are as
follows:
\li #NETDB_SUCCESS: Resolver Error 0 (no error)
\li #HOST_NOT_FOUND: Unknown host
\li #TRY_AGAIN: Host name lookup failure
\li #NO_RECOVERY: Unknown server error
\li #NO_DATA: No address associated with name
*/
#if defined(LIBC_SCCS) && !defined(lint)
static const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93";
static const char rcsid[] =
"$Id$";
#endif /* LIBC_SCCS and not lint */
#include <config.h>
#include <stdio.h>
#include <isc/print.h>
#include <lwres/netdb.h>
#include <lwres/platform.h>
LIBLWRES_EXTERNAL_DATA int lwres_h_errno;
/*!
* these have never been declared in any header file so make them static
*/
static const char *h_errlist[] = {
"Resolver Error 0 (no 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 */
};
static int h_nerr = sizeof(h_errlist) / sizeof(h_errlist[0]);
/*!
* herror --
* print the error indicated by the h_errno value.
*/
void
lwres_herror(const char *s) {
fprintf(stderr, "%s: %s\n", s, lwres_hstrerror(lwres_h_errno));
}
/*!
* hstrerror --
* return the string associated with a given "host" errno value.
*/
const char *
lwres_hstrerror(int err) {
if (err < 0)
return ("Resolver internal error");
else if (err < h_nerr)
return (h_errlist[err]);
return ("Unknown resolver error");
}
|
