1 /*-
2 * SPDX-License-Identifier: (BSD-3-Clause AND ISC)
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 "port_before.h"
50
51 #include "namespace.h"
52 #include <sys/param.h>
53 #include <sys/uio.h>
54
55 #include <netinet/in.h>
56 #include <arpa/nameser.h>
57
58 #include <netdb.h>
59 #include <resolv.h>
60 #include <string.h>
61 #include <unistd.h>
62 #include "un-namespace.h"
63
64 #include "port_after.h"
65
66 const char *h_errlist[] = {
67 "Resolver Error 0 (no error)",
68 "Unknown host", /*%< 1 HOST_NOT_FOUND */
69 "Host name lookup failure", /*%< 2 TRY_AGAIN */
70 "Unknown server error", /*%< 3 NO_RECOVERY */
71 "No address associated with name", /*%< 4 NO_ADDRESS */
72 };
73 const int h_nerr = { nitems(h_errlist) };
74
75 #undef h_errno
76 int h_errno;
77
78 /*%
79 * herror --
80 * print the error indicated by the h_errno value.
81 */
82 void
herror(const char * s)83 herror(const char *s) {
84 struct iovec iov[4], *v = iov;
85 char *t;
86
87 if (s != NULL && *s != '\0') {
88 DE_CONST(s, t);
89 v->iov_base = t;
90 v->iov_len = strlen(t);
91 v++;
92 DE_CONST(": ", t);
93 v->iov_base = t;
94 v->iov_len = 2;
95 v++;
96 }
97 DE_CONST(hstrerror(*__h_errno()), t);
98 v->iov_base = t;
99 v->iov_len = strlen(v->iov_base);
100 v++;
101 DE_CONST("\n", t);
102 v->iov_base = t;
103 v->iov_len = 1;
104 _writev(STDERR_FILENO, iov, (v - iov) + 1);
105 }
106
107 /*%
108 * hstrerror --
109 * return the string associated with a given "host" errno value.
110 */
111 const char *
hstrerror(int err)112 hstrerror(int err) {
113 if (err < 0)
114 return ("Resolver internal error");
115 else if (err < h_nerr)
116 return (h_errlist[err]);
117 return ("Unknown resolver error");
118 }
119
120 /*! \file */
121