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
30#include <sys/cdefs.h>
31__FBSDID("$FreeBSD$");
32
33#include "namespace.h"
34#include <netdb.h>
35#if defined(NLS)
36#include <nl_types.h>
37#include <errno.h>
38#include <limits.h>
39#include <stdlib.h>
40#include <string.h>
41#include "reentrant.h"
42#endif
43#include "un-namespace.h"
44
45/* Entries EAI_ADDRFAMILY (1) and EAI_NODATA (7) are obsoleted, but left */
46/* for backward compatibility with userland code prior to 2553bis-02 */
47static const char *ai_errlist[] = {
48	"Success",					/* 0 */
49	"Address family for hostname not supported",	/* 1 */
50	"Temporary failure in name resolution",		/* EAI_AGAIN */
51	"Invalid value for ai_flags",			/* EAI_BADFLAGS */
52	"Non-recoverable failure in name resolution",	/* EAI_FAIL */
53	"ai_family not supported",			/* EAI_FAMILY */
54	"Memory allocation failure", 			/* EAI_MEMORY */
55	"No address associated with hostname",		/* 7 */
56	"hostname nor servname provided, or not known",	/* EAI_NONAME */
57	"servname not supported for ai_socktype",	/* EAI_SERVICE */
58	"ai_socktype not supported", 			/* EAI_SOCKTYPE */
59	"System error returned in errno", 		/* EAI_SYSTEM */
60	"Invalid value for hints",			/* EAI_BADHINTS */
61	"Resolved protocol is unknown",			/* EAI_PROTOCOL */
62	"Argument buffer overflow"			/* EAI_OVERFLOW */
63};
64
65#if defined(NLS)
66static char		gai_buf[NL_TEXTMAX];
67static once_t		gai_init_once = ONCE_INITIALIZER;
68static thread_key_t	gai_key;
69static int		gai_keycreated = 0;
70
71static void
72gai_keycreate(void)
73{
74	gai_keycreated = (thr_keycreate(&gai_key, free) == 0);
75}
76#endif
77
78const char *
79gai_strerror(int ecode)
80{
81#if defined(NLS)
82	nl_catd catd;
83	char *buf;
84
85	if (thr_main() != 0)
86		buf = gai_buf;
87	else {
88		if (thr_once(&gai_init_once, gai_keycreate) != 0 ||
89		    !gai_keycreated)
90			goto thr_err;
91		if ((buf = thr_getspecific(gai_key)) == NULL) {
92			if ((buf = malloc(sizeof(gai_buf))) == NULL)
93				goto thr_err;
94			if (thr_setspecific(gai_key, buf) != 0) {
95				free(buf);
96				goto thr_err;
97			}
98		}
99	}
100
101	catd = catopen("libc", NL_CAT_LOCALE);
102	if (ecode > 0 && ecode < EAI_MAX)
103		strlcpy(buf, catgets(catd, 3, ecode, ai_errlist[ecode]),
104		    sizeof(gai_buf));
105	else if (ecode == 0)
106		strlcpy(buf, catgets(catd, 3, NL_MSGMAX - 1, "Success"),
107		    sizeof(gai_buf));
108	else
109		strlcpy(buf, catgets(catd, 3, NL_MSGMAX, "Unknown error"),
110		    sizeof(gai_buf));
111	catclose(catd);
112	return buf;
113
114thr_err:
115#endif
116	if (ecode >= 0 && ecode < EAI_MAX)
117		return ai_errlist[ecode];
118	return "Unknown error";
119}
120