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28f540f4 1/*
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2 * Copyright (c) 1987, 1993
3 * The Regents of the University of California. All rights reserved.
e2ec9b4d 4 *
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5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
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13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
e2ec9b4d 16 *
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17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
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28 */
29
30/*
31 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
cbd3dceb 32 *
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33 * Permission to use, copy, modify, and distribute this software for any
34 * purpose with or without fee is hereby granted, provided that the above
e685e07d 35 * copyright notice and this permission notice appear in all copies.
cbd3dceb 36 *
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37 * THE SOFTWARE IS PROVIDED "AS IS" AND INTERNET SOFTWARE CONSORTIUM DISCLAIMS
38 * ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL INTERNET SOFTWARE
40 * CONSORTIUM BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL
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41 * DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
42 * PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS
43 * ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS
44 * SOFTWARE.
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45 */
46
df21c858 47#include <sys/types.h>
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48#include <sys/param.h>
49#include <sys/uio.h>
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50
51#include <netinet/in.h>
52#include <arpa/nameser.h>
53
28f540f4 54#include <netdb.h>
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55#include <resolv.h>
56#include <string.h>
57#include <unistd.h>
58
4360eafd 59#include <libintl.h>
8dab36a1 60#include <not-cancel.h>
28f540f4 61
e1545188 62const char *const h_errlist[] = {
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63 N_("Resolver Error 0 (no error)"),
64 N_("Unknown host"), /* 1 HOST_NOT_FOUND */
65 N_("Host name lookup failure"), /* 2 TRY_AGAIN */
66 N_("Unknown server error"), /* 3 NO_RECOVERY */
67 N_("No address associated with name"), /* 4 NO_ADDRESS */
28f540f4 68};
e1545188 69const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
28f540f4 70
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71/*
72 * herror --
73 * print the error indicated by the h_errno value.
74 */
75void
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76herror(const char *s) {
77 struct iovec iov[4], *v = iov;
28f540f4 78
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79 if (s != NULL && *s != '\0') {
80 v->iov_base = (/*noconst*/ char *)s;
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81 v->iov_len = strlen(s);
82 v++;
bf8c5424 83 v->iov_base = (char *) ": ";
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84 v->iov_len = 2;
85 v++;
86 }
3d61b63c 87 v->iov_base = (char *)hstrerror(h_errno);
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88 v->iov_len = strlen(v->iov_base);
89 v++;
bf8c5424 90 v->iov_base = (char *) "\n";
28f540f4 91 v->iov_len = 1;
19926de9 92 __writev_nocancel_nostatus(STDERR_FILENO, iov, (v - iov) + 1);
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93}
94
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95/*
96 * hstrerror --
97 * return the string associated with a given "host" errno value.
98 */
3d61b63c 99const char *
e685e07d 100hstrerror(int err) {
28f540f4 101 if (err < 0)
cbd3dceb 102 return _("Resolver internal error");
28f540f4 103 else if (err < h_nerr)
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104 return _(h_errlist[err]);
105 return _("Unknown resolver error");
28f540f4 106}
e2ec9b4d 107libc_hidden_def (hstrerror)