1 /* $NetBSD: herror.c,v 1.6 2014/12/10 04:38:02 christos Exp $ */
2
3 /*
4 * Portions Copyright (C) 2004, 2005, 2007, 2011, 2012, 2014 Internet Systems Consortium, Inc. ("ISC")
5 * Portions Copyright (C) 2000, 2001, 2003 Internet Software Consortium.
6 *
7 * Permission to use, copy, modify, and/or distribute this software for any
8 * purpose with or without fee is hereby granted, provided that the above
9 * copyright notice and this permission notice appear in all copies.
10 *
11 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES WITH
12 * REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY
13 * AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR ANY SPECIAL, DIRECT,
14 * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
15 * LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE
16 * OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
17 * PERFORMANCE OF THIS SOFTWARE.
18 */
19
20 /*
21 * Copyright (c) 1987, 1993
22 * The Regents of the University of California. All rights reserved.
23 *
24 * Redistribution and use in source and binary forms, with or without
25 * modification, are permitted provided that the following conditions
26 * are met:
27 * 1. Redistributions of source code must retain the above copyright
28 * notice, this list of conditions and the following disclaimer.
29 * 2. Redistributions in binary form must reproduce the above copyright
30 * notice, this list of conditions and the following disclaimer in the
31 * documentation and/or other materials provided with the distribution.
32 * 3. Neither the name of the University nor the names of its contributors
33 * may be used to endorse or promote products derived from this software
34 * without specific prior written permission.
35 *
36 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
37 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
38 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
39 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
40 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
41 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
42 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
43 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
44 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
45 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46 * SUCH DAMAGE.
47 */
48
49 /*! \file herror.c
50 lwres_herror() prints the string s on stderr followed by the string
51 generated by lwres_hstrerror() for the error code stored in the global
52 variable lwres_h_errno.
53
54 lwres_hstrerror() returns an appropriate string for the error code
55 gievn by err. The values of the error codes and messages are as
56 follows:
57
58 \li #NETDB_SUCCESS: Resolver Error 0 (no error)
59
60 \li #HOST_NOT_FOUND: Unknown host
61
62 \li #TRY_AGAIN: Host name lookup failure
63
64 \li #NO_RECOVERY: Unknown server error
65
66 \li #NO_DATA: No address associated with name
67
68 */
69
70 #if defined(LIBC_SCCS) && !defined(lint)
71 static const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93";
72 static const char rcsid[] =
73 "Id";
74 #endif /* LIBC_SCCS and not lint */
75
76 #include <config.h>
77
78 #include <stdio.h>
79
80 #include <lwres/netdb.h>
81 #include <lwres/platform.h>
82
83 LIBLWRES_EXTERNAL_DATA int lwres_h_errno;
84
85 /*!
86 * these have never been declared in any header file so make them static
87 */
88
89 static const char *h_errlist[] = {
90 "Resolver Error 0 (no error)", /*%< 0 no error */
91 "Unknown host", /*%< 1 HOST_NOT_FOUND */
92 "Host name lookup failure", /*%< 2 TRY_AGAIN */
93 "Unknown server error", /*%< 3 NO_RECOVERY */
94 "No address associated with name", /*%< 4 NO_ADDRESS */
95 };
96
97 static int h_nerr = sizeof(h_errlist) / sizeof(h_errlist[0]);
98
99
100 /*!
101 * herror --
102 * print the error indicated by the h_errno value.
103 */
104 void
lwres_herror(const char * s)105 lwres_herror(const char *s) {
106 fprintf(stderr, "%s: %s\n", s, lwres_hstrerror(lwres_h_errno));
107 }
108
109 /*!
110 * hstrerror --
111 * return the string associated with a given "host" errno value.
112 */
113 const char *
lwres_hstrerror(int err)114 lwres_hstrerror(int err) {
115 if (err < 0)
116 return ("Resolver internal error");
117 else if (err < h_nerr)
118 return (h_errlist[err]);
119 return ("Unknown resolver error");
120 }
121