-
Notifications
You must be signed in to change notification settings - Fork 7
/
dlloader.c
235 lines (216 loc) · 4.98 KB
/
dlloader.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
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
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
#include "config.h"
#ifndef _MSC_VER
#include <dlfcn.h>
#endif
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include "dlloader.h"
static char **search_list = NULL;
#ifdef _WIN32
#include <windows.h>
static struct {
long lasterror;
const char* err_rutin;
} var = {
0,
NULL
};
void* dlopen(const char* filename, int flags)
{
HINSTANCE hInst;
hInst = LoadLibrary(filename);
if (hInst == NULL) {
var.lasterror = GetLastError();
var.err_rutin = "dlopen";
}
return hInst;
}
int dlclose(void* handle)
{
BOOL ok;
int rc = 0;
ok = FreeLibrary((HINSTANCE)handle);
if (!ok) {
var.lasterror = GetLastError();
var.err_rutin = "dlclose";
rc = -1;
}
return rc;
}
void* dlsym(void* handle, const char* name)
{
FARPROC fp;
fp = GetProcAddress((HINSTANCE)handle, name);
if (!fp) {
var.lasterror = GetLastError();
var.err_rutin = "dlsym";
}
return (void*)(intptr_t)fp;
}
#ifndef DLFCN_EXPORT
const char* dlerror(void)
#else
DLFCN_EXPORT char* dlerror(void)
#endif
{
static char errstr[88];
if (var.lasterror) {
sprintf(errstr, "%s error #%ld", var.err_rutin, var.lasterror);
return errstr;
}
else {
return NULL;
}
}
#endif
void
CMdladdsearchdir(char *string)
{
int count = 0;
if (search_list == NULL) {
search_list = malloc(2*sizeof(char*));
} else {
while(search_list[count] != NULL) count++;
search_list = realloc(search_list, (count+2)*sizeof(char*));
}
search_list[count] = strdup(string);
search_list[count+1] = NULL;
}
typedef struct {
void *dlopen_handle;
char *lib_prefix;
} *dlhandle;
static int dlopen_verbose = -1;
void
CMset_dlopen_verbose(int verbose)
{
dlopen_verbose = verbose;
}
#undef dlopen
void *
CMdlopen(void *CMTrace_filev, char *in_lib, int mode)
{
#if NO_DYNAMIC_LINKING
return NULL;
#else
dlhandle dlh;
void *handle = NULL;
char *tmp;
char *lib;
FILE *CMTrace_file = (FILE*)CMTrace_filev;
if (dlopen_verbose == -1) {
dlopen_verbose = (getenv("CMTransportVerbose") != NULL);
}
tmp = strrchr(in_lib, '.');
if (dlopen_verbose) fprintf(CMTrace_file, "Trying to dlopen %s\n", in_lib);
if (tmp && (strcmp(tmp, ".la") == 0)) {
/* can't open .la files */
lib = malloc(strlen(in_lib) + strlen(MODULE_EXT) + 8);
strcpy(lib, in_lib);
strcpy(strrchr(lib, '.'), MODULE_EXT);
if (dlopen_verbose) fprintf(CMTrace_file, "Dlopen module name replaced, now %s\n", lib);
} else {
lib = strdup(in_lib);
}
char **list = search_list;
while(list && (list[0] != NULL)) {
char *tmp = malloc(strlen(list[0]) + strlen(lib) + 2);
sprintf(tmp, "%s/%s", list[0], lib);
handle = dlopen(tmp, RTLD_LAZY);
const char *err = dlerror();
if (dlopen_verbose) {
if (err) {
fprintf(CMTrace_file, "Failed to dlopen %s, error is %s\n", tmp, err);
} else {
fprintf(CMTrace_file, "DLopen of %s succeeded\n", tmp);
}
}
free(tmp);
list++;
if (handle) list = NULL; // fall out
}
if (!handle) {
handle = dlopen(lib, RTLD_LAZY);
const char *err = dlerror();
if (dlopen_verbose) {
if (err) {
fprintf(CMTrace_file, "Failed to dlopen %s, error is %s\n", tmp, err);
} else {
fprintf(CMTrace_file, "DLopen of %s succeeded\n", tmp);
}
}
}
if (!handle) return NULL;
dlh = malloc(sizeof(*dlh));
tmp = strrchr(lib, '/'); /* find name start */
if (!tmp) tmp = lib;
char *cm_lib_prefix;
if(strlen(CM_LIBRARY_PREFIX) > 0 &&
(cm_lib_prefix = strstr(tmp, CM_LIBRARY_PREFIX))) {
dlh->lib_prefix = malloc(strlen(tmp) - strlen(CM_LIBRARY_PREFIX) + 4);
strncpy(dlh->lib_prefix, tmp, cm_lib_prefix-tmp);
strcpy(dlh->lib_prefix + (cm_lib_prefix - tmp),
cm_lib_prefix + strlen(CM_LIBRARY_PREFIX));
}
else {
dlh->lib_prefix = malloc(strlen(tmp) + 4);
strcpy(dlh->lib_prefix, tmp);
}
tmp = strrchr(dlh->lib_prefix, '.');
strcpy(tmp, "_LTX_"); /* kill postfix, add _LTX_ */
dlh->dlopen_handle = handle;
free(lib);
return (void*)dlh;
#endif
}
void*
CMdlsym(void *vdlh, char *sym)
{
#if NO_DYNAMIC_LINKING
return NULL;
#else
dlhandle dlh = (dlhandle)vdlh;
char *tmp = malloc(strlen(sym) + strlen(dlh->lib_prefix) + 3);
void *sym_val;
strcpy(tmp, dlh->lib_prefix);
strcat(tmp, sym);
sym_val = dlsym(dlh->dlopen_handle, tmp);
if (!sym_val) {
// try with lib prefix
char *tmp2 = malloc(strlen(tmp) + 4);
strcpy(tmp2, "lib");
strcat(tmp2, tmp);
sym_val = dlsym(dlh->dlopen_handle, tmp2);
free(tmp2);
}
free(tmp);
if (!sym_val)
sym_val = dlsym(dlh->dlopen_handle, sym);
return sym_val;
#endif
}
void
CMdlclose(void *vdlh)
{
#if NO_DYNAMIC_LINKING
return;
#else
dlhandle dlh = (dlhandle)vdlh;
#ifdef ACTUALL_DO_DLCLOSE
dlclose(dlh->dlopen_handle);
#endif
free(dlh->lib_prefix);
free(dlh);
#endif
}
void
CMdlclearsearchlist()
{
int i = 0;
while(search_list[i]) {
free(search_list[i]);
i++;
}
free(search_list);
}