1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
|
/* idn-stub.c --- Stub to dlopen libcidn.so and invoke idna_to_ascii_lz.
* Copyright (C) 2003, 2004 Simon Josefsson
*
* This file is part of GNU Libidn.
*
* GNU Libidn is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* GNU Libidn is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with GNU Libidn; if not, see <http://www.gnu.org/licenses/>.
*/
#include <ctype.h>
#include <stdio.h>
#include <string.h>
#include <dlfcn.h>
#include <gnu/lib-names.h>
#include <bits/libc-lock.h>
/* Get specification for idna_to_ascii_lz. */
#include "idna.h"
/* Handle of the libidn DSO. */
static void *h;
static int (*to_ascii_lz) (const char *input, char **output, int flags);
static int (*to_unicode_lzlz) (const char *input, char **output, int flags);
static void
load_dso (void)
{
/* Lock protecting the DSO loading. */
__libc_lock_define_initialized (static, lock);
__libc_lock_lock (lock);
/* Retest in case some other thread arrived here at the same time. */
if (h == NULL)
{
h = __libc_dlopen (LIBCIDN_SO);
if (h == NULL)
h = (void *) 1l;
else
{
/* Get the function we are interested in. */
to_ascii_lz = __libc_dlsym (h, "idna_to_ascii_lz");
to_unicode_lzlz = __libc_dlsym (h, "idna_to_unicode_lzlz");
if (to_ascii_lz == NULL || to_unicode_lzlz == NULL)
{
__libc_dlclose (h);
h = (void *) 1l;
}
}
}
__libc_lock_unlock (lock);
}
/* Stub to dlopen libcidn.so and invoke the real idna_to_ascii_lz, or
return IDNA_DLOPEN_ERROR on failure. */
int
__idna_to_unicode_lzlz (const char *input, char **output, int flags)
{
/* If the input string contains no "xn--" prefix for a component of
the name we can pass it up right away. */
const char *cp = input;
while (*cp != '\0')
{
if (strncmp (cp, IDNA_ACE_PREFIX, strlen (IDNA_ACE_PREFIX)) == 0)
break;
/* On to the next part of the name. */
cp = __strchrnul (cp, '.');
if (*cp == '.')
++cp;
}
if (*cp == '\0')
{
*output = (char *) input;
return IDNA_SUCCESS;
}
if (h == NULL)
load_dso ();
if (h == (void *) 1l)
return IDNA_DLOPEN_ERROR;
return to_unicode_lzlz (input, output, flags);
}
/* Stub to dlopen libcidn.so and invoke the real idna_to_ascii_lz, or
return IDNA_DLOPEN_ERROR on failure. */
int
__idna_to_ascii_lz (const char *input, char **output, int flags)
{
/* If the input string contains no non-ASCII character the output
string will be the same. No valid locale encoding does not have
this property. */
const char *cp = input;
while (*cp != '\0' && isascii (*cp))
++cp;
if (*cp == '\0')
{
*output = (char *) input;
return IDNA_SUCCESS;
}
if (h == NULL)
load_dso ();
if (h == (void *) 1l)
return IDNA_DLOPEN_ERROR;
return to_ascii_lz (input, output, flags);
}
#ifndef NOT_IN_libc
libc_freeres_fn (unload_libidn)
{
if (h != NULL && h != (void *) 1l)
{
__libc_dlclose (h);
h = (void *) 1l;
}
}
#endif
|
