-
Notifications
You must be signed in to change notification settings - Fork 2
/
liboindirect.c
146 lines (100 loc) · 2.71 KB
/
liboindirect.c
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
/*
Bugs: [email protected]
*/
#include <dlfcn.h>
#include <sys/types.h>
#include <stdio.h>
#include <stdarg.h>
#include <stdlib.h>
#include <pthread.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <ctype.h>
#define __cons __attribute__((constructor))
#define TRAP(func, params) \
evil_##func params; \
static int (*real_##func) params; \
static void set_real_##func (void) __cons; \
static void set_real_##func (void) \
{ real_##func = dlsym (RTLD_NEXT, #func); } \
int __REDIRECT (evil_##func, params, func); \
int evil_##func params
int loi_debug = 0;
int
dbg (const char *fmt, ...)
{
int ret = 0;
va_list ap;
if (!loi_debug)
return 0;
va_start (ap, fmt);
ret = vfprintf (stderr, fmt, ap);
va_end (ap);
return ret;
}
int
err (const char *fmt, ...)
{
int ret = 0;
va_list ap;
va_start (ap, fmt);
ret = vfprintf (stderr, fmt, ap);
va_end (ap);
return ret;
}
static void
dbg_init ()
{
if (getenv ("LOI_DEBUG"))
loi_debug = 1;
}
int
TRAP (open, (const char *path, int flags, mode_t mode))
{
int ret;
ret = real_open (path, flags, mode);
if (ret >= 0)
return ret;
if (ret == -1 && errno == EINVAL && (flags & O_DIRECT)) {
flags &= ~O_DIRECT;
flags |= O_SYNC; /* instead */
}
ret = real_open (path, flags, mode);
return ret;
}
int
TRAP (open64, (const char *path, int flags, mode_t mode))
{
int ret;
ret = real_open64 (path, flags, mode);
if (ret >= 0)
return ret;
if (ret == -1 && errno == EINVAL && (flags & O_DIRECT)) {
flags &= ~O_DIRECT;
flags |= O_SYNC; /* instead */
}
ret = real_open64 (path, flags, mode);
return ret;
}
int
TRAP (openat, (int dirfd, const char *path, int flags, mode_t mode))
{
int ret;
ret = real_openat (dirfd, path, flags, mode);
if (ret >= 0)
return ret;
if (ret == -1 && errno == EINVAL && (flags & O_DIRECT)) {
flags &= ~O_DIRECT;
flags |= O_SYNC; /* instead */
}
ret = real_openat (dirfd, path, flags, mode);
return ret;
}
static void loi_init (void) __attribute__((constructor));
static void
loi_init (void)
{
dbg_init ();
return;
}