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
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
|
/*
* virfilewrapper.c: Wrapper for universal file access
*
* This library 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.
*
* This library 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 this library. If not, see
* <http://www.gnu.org/licenses/>.
*/
#include <config.h>
#ifndef WIN32
# include <fcntl.h>
# include "viralloc.h"
# include "virfilewrapper.h"
# include "virmock.h"
/* Mapping for prefix overrides */
static size_t noverrides;
static const char **overrides;
/* nprefixes == noverrides, but two variables make it easier to use
* VIR_*_ELEMENT macros */
static size_t nprefixes;
static const char **prefixes;
/* TODO: callbacks */
static int (*real_open)(const char *path, int flags, ...);
static FILE *(*real_fopen)(const char *path, const char *mode);
static int (*real_access)(const char *path, int mode);
static int (*real_mkdir)(const char *path, mode_t mode);
static DIR *(*real_opendir)(const char *path);
static int (*real_execv)(const char *path, char *const argv[]);
static int (*real_execve)(const char *path, char *const argv[], char *const envp[]);
static void init_syms(void)
{
if (real_fopen)
return;
VIR_MOCK_REAL_INIT(fopen);
VIR_MOCK_REAL_INIT(access);
VIR_MOCK_REAL_INIT(mkdir);
VIR_MOCK_REAL_INIT(open);
# if defined(__APPLE__) && defined(__x86_64__)
VIR_MOCK_REAL_INIT_ALIASED(opendir, "opendir$INODE64");
# else
VIR_MOCK_REAL_INIT(opendir);
# endif
VIR_MOCK_REAL_INIT(execv);
VIR_MOCK_REAL_INIT(execve);
}
void
virFileWrapperAddPrefix(const char *prefix,
const char *override)
{
/* Both parameters are mandatory */
if (!prefix || !override) {
fprintf(stderr, "Attempt to add invalid path override\n");
abort();
}
init_syms();
VIR_APPEND_ELEMENT(prefixes, nprefixes, prefix);
VIR_APPEND_ELEMENT(overrides, noverrides, override);
}
void
virFileWrapperRemovePrefix(const char *prefix)
{
size_t i = 0;
for (i = 0; i < noverrides; i++) {
if (STREQ(prefixes[i], prefix))
break;
}
if (i == noverrides)
return;
VIR_DELETE_ELEMENT(overrides, i, noverrides);
VIR_DELETE_ELEMENT(prefixes, i, nprefixes);
}
void
virFileWrapperClearPrefixes(void)
{
nprefixes = 0;
noverrides = 0;
VIR_FREE(prefixes);
VIR_FREE(overrides);
}
# include "virmockstathelpers.c"
int
virMockStatRedirect(const char *path, char **newpath)
{
size_t i = 0;
for (i = 0; i < noverrides; i++) {
const char *tmp = STRSKIP(path, prefixes[i]);
if (!tmp)
continue;
*newpath = g_strdup_printf("%s%s", overrides[i], tmp);
break;
}
return 0;
}
# define PATH_OVERRIDE(newpath, path) \
do { \
init_syms(); \
\
if (virMockStatRedirect(path, &newpath) < 0) \
abort(); \
} while (0)
FILE *fopen(const char *path, const char *mode)
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real_fopen(newpath ? newpath : path, mode);
}
int access(const char *path, int mode)
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real_access(newpath ? newpath : path, mode);
}
int open(const char *path, int flags, ...)
{
g_autofree char *newpath = NULL;
va_list ap;
mode_t mode = 0;
PATH_OVERRIDE(newpath, path);
/* The mode argument is mandatory when O_CREAT is set in flags,
* otherwise the argument is ignored.
*/
if (flags & O_CREAT) {
va_start(ap, flags);
mode = (mode_t) va_arg(ap, int);
va_end(ap);
}
return real_open(newpath ? newpath : path, flags, mode);
}
DIR *opendir(const char *path)
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real_opendir(newpath ? newpath : path);
}
int execv(const char *path, char *const argv[])
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real_execv(newpath ? newpath : path, argv);
}
int execve(const char *path, char *const argv[], char *const envp[])
{
g_autofree char *newpath = NULL;
PATH_OVERRIDE(newpath, path);
return real_execve(newpath ? newpath : path, argv, envp);
}
#endif
|
