1 /*
2 * Copyright (C) 1995, 1996, 1997, and 1998 WIDE Project.
3 * 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. Neither the name of the project 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 PROJECT 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 PROJECT 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 * $FreeBSD: head/lib/libc/net/gai_strerror.c 199083 2009-11-09 12:46:59Z ume $
30 */
31
32 #include "namespace.h"
33 #include <netdb.h>
34 #if defined(NLS)
35 #include <nl_types.h>
36 #include <errno.h>
37 #include <limits.h>
38 #include <stdlib.h>
39 #include <string.h>
40 #include "reentrant.h"
41 #endif
42 #include "un-namespace.h"
43
44 /* Entries EAI_ADDRFAMILY (1) and EAI_NODATA (7) are obsoleted, but left */
45 /* for backward compatibility with userland code prior to 2553bis-02 */
46 static const char *ai_errlist[] = {
47 "Success", /* 0 */
48 "Address family for hostname not supported", /* 1 */
49 "Temporary failure in name resolution", /* EAI_AGAIN */
50 "Invalid value for ai_flags", /* EAI_BADFLAGS */
51 "Non-recoverable failure in name resolution", /* EAI_FAIL */
52 "ai_family not supported", /* EAI_FAMILY */
53 "Memory allocation failure", /* EAI_MEMORY */
54 "No address associated with hostname", /* 7 */
55 "hostname nor servname provided, or not known", /* EAI_NONAME */
56 "servname not supported for ai_socktype", /* EAI_SERVICE */
57 "ai_socktype not supported", /* EAI_SOCKTYPE */
58 "System error returned in errno", /* EAI_SYSTEM */
59 "Invalid value for hints", /* EAI_BADHINTS */
60 "Resolved protocol is unknown", /* EAI_PROTOCOL */
61 "Argument buffer overflow" /* EAI_OVERFLOW */
62 };
63
64 #if defined(NLS)
65 static char gai_buf[NL_TEXTMAX];
66 static once_t gai_init_once = ONCE_INITIALIZER;
67 static thread_key_t gai_key;
68 static int gai_keycreated = 0;
69
70 static void
gai_keycreate(void)71 gai_keycreate(void)
72 {
73 gai_keycreated = (thr_keycreate(&gai_key, free) == 0);
74 }
75 #endif
76
77 const char *
gai_strerror(int ecode)78 gai_strerror(int ecode)
79 {
80 #if defined(NLS)
81 nl_catd catd;
82 char *buf;
83
84 if (thr_main() != 0)
85 buf = gai_buf;
86 else {
87 if (thr_once(&gai_init_once, gai_keycreate) != 0 ||
88 !gai_keycreated)
89 goto thr_err;
90 if ((buf = thr_getspecific(gai_key)) == NULL) {
91 if ((buf = malloc(sizeof(gai_buf))) == NULL)
92 goto thr_err;
93 if (thr_setspecific(gai_key, buf) != 0) {
94 free(buf);
95 goto thr_err;
96 }
97 }
98 }
99
100 catd = catopen("libc", NL_CAT_LOCALE);
101 if (ecode > 0 && ecode < EAI_MAX)
102 strlcpy(buf, catgets(catd, 3, ecode, ai_errlist[ecode]),
103 sizeof(gai_buf));
104 else if (ecode == 0)
105 strlcpy(buf, catgets(catd, 3, NL_MSGMAX - 1, "Success"),
106 sizeof(gai_buf));
107 else
108 strlcpy(buf, catgets(catd, 3, NL_MSGMAX, "Unknown error"),
109 sizeof(gai_buf));
110 catclose(catd);
111 return buf;
112
113 thr_err:
114 #endif
115 if (ecode >= 0 && ecode < EAI_MAX)
116 return ai_errlist[ecode];
117 return "Unknown error";
118 }
119