1 /*
2 * @(#)herror.c 8.1 (Berkeley) 6/4/93
3 * $Id: herror.c,v 1.4 2005/04/27 04:56:41 sra Exp $
4 */
5
6 /*
7 * Copyright (c) 1987, 1993
8 * The Regents of the University of California. All rights reserved.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 * notice, this list of conditions and the following disclaimer in the
17 * documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 * may be used to endorse or promote products derived from this software
20 * without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 /*
36 * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
37 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
38 *
39 * Permission to use, copy, modify, and distribute this software for any
40 * purpose with or without fee is hereby granted, provided that the above
41 * copyright notice and this permission notice appear in all copies.
42 *
43 * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
44 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
45 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
46 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
47 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
48 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
49 * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
50 */
51
52 #include "port_before.h"
53
54 #ifdef _LIBC
55 #include "namespace.h"
56 #endif
57
58 #include <sys/types.h>
59 #include <sys/param.h>
60 #include <sys/uio.h>
61
62 #include <netinet/in.h>
63 #include <arpa/nameser.h>
64
65 #include <netdb.h>
66 #include <resolv.h>
67 #include <string.h>
68 #include <unistd.h>
69 #ifndef _LIBC
70 #include <irs.h>
71 #else
72 #include "un-namespace.h"
73 #endif
74
75 #include "port_after.h"
76
77 const char *h_errlist[] = {
78 "Resolver Error 0 (no error)",
79 "Unknown host", /*%< 1 HOST_NOT_FOUND */
80 "Host name lookup failure", /*%< 2 TRY_AGAIN */
81 "Unknown server error", /*%< 3 NO_RECOVERY */
82 "No address associated with name", /*%< 4 NO_ADDRESS */
83 };
84 int h_nerr = { NELEM(h_errlist) };
85
86 #if !(__GLIBC__ > 2 || __GLIBC__ == 2 && __GLIBC_MINOR__ >= 3)
87 #undef h_errno
88 int h_errno;
89 #endif
90
91 /*%
92 * herror --
93 * print the error indicated by the h_errno value.
94 */
95 void
herror(const char * s)96 herror(const char *s) {
97 struct iovec iov[4], *v = iov;
98 char *t;
99
100 if (s != NULL && *s != '\0') {
101 DE_CONST(s, t);
102 v->iov_base = t;
103 v->iov_len = strlen(t);
104 v++;
105 DE_CONST(": ", t);
106 v->iov_base = t;
107 v->iov_len = 2;
108 v++;
109 }
110 DE_CONST(hstrerror(*__h_errno()), t);
111 v->iov_base = t;
112 v->iov_len = strlen(v->iov_base);
113 v++;
114 DE_CONST("\n", t);
115 v->iov_base = t;
116 v->iov_len = 1;
117 #ifndef _LIBC
118 writev(STDERR_FILENO, iov, (v - iov) + 1);
119 #else
120 _writev(STDERR_FILENO, iov, (v - iov) + 1);
121 #endif
122 }
123
124 /*%
125 * hstrerror --
126 * return the string associated with a given "host" errno value.
127 */
128 const char *
hstrerror(int err)129 hstrerror(int err) {
130 if (err < 0)
131 return ("Resolver internal error");
132 else if (err < h_nerr)
133 return (h_errlist[err]);
134 return ("Unknown resolver error");
135 }
136
137 /*! \file */
138