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