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
56 static const char sccsid[] = "@(#)herror.c 8.1 (Berkeley) 6/4/93";
57 static 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
84 const 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 };
91 const 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 */
97 void
herror(const char * s)98 herror(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 */
126 const char *
hstrerror(int err)127 hstrerror(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