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 #include <sys/cdefs.h>
50 #if defined(LIBC_SCCS) && !defined(lint)
51 #ifdef notdef
52 static const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93";
53 static const char rcsid[] = "Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp";
54 #else
55 __RCSID("$NetBSD: herror.c,v 1.10 2015/02/24 17:56:20 christos Exp $");
56 #endif
57 #endif /* LIBC_SCCS and not lint */
58
59 #include "port_before.h"
60
61 #include "namespace.h"
62 #include <sys/types.h>
63 #include <sys/param.h>
64 #include <sys/uio.h>
65
66 #include <netinet/in.h>
67 #include <arpa/nameser.h>
68
69 #include <netdb.h>
70 #include <resolv.h>
71 #include <string.h>
72 #include <unistd.h>
73
74 #include "port_after.h"
75
76 const char *h_errlist[] = {
77 "Resolver Error 0 (no error)",
78 "Unknown host", /*%< 1 HOST_NOT_FOUND */
79 "Host name lookup failure", /*%< 2 TRY_AGAIN */
80 "Unknown server error", /*%< 3 NO_RECOVERY */
81 "No address associated with name", /*%< 4 NO_ADDRESS */
82 };
83 int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
84
85 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)
86 #undef h_errno
87 int h_errno;
88 #endif
89
90 #ifdef __weak_alias
__weak_alias(herror,_herror)91 __weak_alias(herror,_herror)
92 #endif
93
94 /*%
95 * herror --
96 * print the error indicated by the h_errno value.
97 */
98 void
99 herror(const char *s) {
100 struct iovec iov[4], *v = iov;
101 char *t;
102
103 if (s != NULL && *s != '\0') {
104 DE_CONST(s, t);
105 v->iov_base = t;
106 v->iov_len = strlen(t);
107 v++;
108 DE_CONST(": ", t);
109 v->iov_base = t;
110 v->iov_len = 2;
111 v++;
112 }
113 DE_CONST(hstrerror(*__h_errno()), t);
114 v->iov_base = t;
115 v->iov_len = strlen(v->iov_base);
116 v++;
117 DE_CONST("\n", t);
118 v->iov_base = t;
119 v->iov_len = 1;
120 (void)writev(STDERR_FILENO, iov, (int)((v - iov) + 1));
121 }
122
123 /*%
124 * hstrerror --
125 * return the string associated with a given "host" errno value.
126 */
127 const char *
hstrerror(int err)128 hstrerror(int err) {
129 if (err < 0)
130 return ("Resolver internal error");
131 else if (err < h_nerr)
132 return (h_errlist[err]);
133 return ("Unknown resolver error");
134 }
135
136 /*! \file */
137