1 /*
2 * Copyright (c) 1987, 1993
3 * The Regents of the University of California. All rights reserved.
4 *
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.
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.
16 *
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.
28 */
29
30 /*
31 * Portions Copyright (c) 1996-1999 by Internet Software Consortium.
32 *
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
35 * copyright notice and this permission notice appear in all copies.
36 *
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
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.
45 */
46
47 #include <sys/types.h>
48 #include <sys/param.h>
49 #include <sys/uio.h>
50
51 #include <netinet/in.h>
52 #include <arpa/nameser.h>
53
54 #include <netdb.h>
55 #include <resolv.h>
56 #include <string.h>
57 #include <unistd.h>
58
59 #include <libintl.h>
60 #include <not-cancel.h>
61
62 const char *const h_errlist[] = {
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 */
68 };
69 const int h_nerr = { sizeof h_errlist / sizeof h_errlist[0] };
70
71 /*
72 * herror --
73 * print the error indicated by the h_errno value.
74 */
75 void
76 herror(const char *s) {
77 struct iovec iov[4], *v = iov;
78
79 if (s != NULL && *s != '\0') {
80 v->iov_base = (/*noconst*/ char *)s;
81 v->iov_len = strlen(s);
82 v++;
83 v->iov_base = (char *) ": ";
84 v->iov_len = 2;
85 v++;
86 }
87 v->iov_base = (char *)hstrerror(h_errno);
88 v->iov_len = strlen(v->iov_base);
89 v++;
90 v->iov_base = (char *) "\n";
91 v->iov_len = 1;
92 __writev_nocancel_nostatus(STDERR_FILENO, iov, (v - iov) + 1);
93 }
94
95 /*
96 * hstrerror --
97 * return the string associated with a given "host" errno value.
98 */
99 const char *
100 hstrerror(int err) {
101 if (err < 0)
102 return _("Resolver internal error");
103 else if (err < h_nerr)
104 return _(h_errlist[err]);
105 return _("Unknown resolver error");
106 }
107 libc_hidden_def (hstrerror)