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
|
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#include <sys/types.h>
#include "module.h"
#include "arch.h"
#define fprintf(...)
#define NOTFOUND (size_t)(-1)
#define PROCMAPS_LINE_MAX_LENGTH (PATH_MAX + 100)
static void* strtoptr(pid_t pid, const char* nptr, char** endptr, int base)
{
unsigned char bits = getProcessBits(pid);
if (bits == 64)
return (void*)strtoull(nptr, endptr, base);
else if (bits == 32)
return (void*)strtoul(nptr, endptr, base);
return NULL;
}
static size_t find(const char* a, const char* b, uintptr_t offset)
{
const char* pos = a + offset;
while (*pos && strncmp(pos, b, strlen(b)))
++pos;
if (!*pos)
return NOTFOUND;
return (size_t)(pos - a);
}
static size_t rfind(const char* a, const char* b, size_t offset)
{
const char* pos = a + (strlen(a) - strlen(b) - offset);
while (a <= pos && strncmp(pos, b, strlen(b)))
--pos;
if (pos < a)
return NOTFOUND;
return (size_t)(pos - a);
}
static char* substr(const char* str, size_t pos, size_t len)
{
str = str + pos;
if (len == NOTFOUND)
len = strlen(str);
char* buf = malloc(len+1);
strncpy(buf, str, len);
buf[len] = '\0';
return buf;
}
struct module_s getModule(pid_t pid, const char* module_name)
{
struct module_s mod = {0};
char maps_file_path[PATH_MAX];
snprintf(maps_file_path, sizeof(maps_file_path), "/proc/%i/maps", pid);
fprintf(stderr, "Maps file path: %s\n", maps_file_path);
FILE* maps_file_fs = fopen(maps_file_path, "rb");
if (!maps_file_fs) return mod;
char maps_file[PROCMAPS_LINE_MAX_LENGTH];
while( !feof(maps_file_fs) ){
if (fgets(maps_file, sizeof(maps_file), maps_file_fs) == NULL){
fprintf(stderr,"fgets failed, %s\n",strerror(errno));
return mod;
}
size_t module_path_pos = 0;
size_t module_path_end = 0;
//Get the first slash in the line of the module name
module_path_pos = find(maps_file, module_name, 0);
if (module_path_pos == NOTFOUND)
continue;
module_path_pos = find(maps_file, "/", 0);
//Get the end of the line of the module name
module_path_end = find(maps_file, "\n", module_path_pos);
if(module_path_pos == NOTFOUND || module_path_end == NOTFOUND) continue;
//Module path substring
char* module_path_str = substr(maps_file, module_path_pos, module_path_end - module_path_pos);
fprintf(stderr, "Module path string: %s\n", module_path_str);
//--- Module name
char* module_name_str = substr(module_path_str,
rfind(module_path_str, "/", 0) + 1, //Substring from the last '/' to the end of the string
NOTFOUND
);
fprintf(stderr, "Module name: %s\n", module_name_str);
//--- Base Address
size_t base_address_pos = rfind(maps_file, "\n", module_path_pos) + 1;
size_t base_address_end = find(maps_file, "-", base_address_pos);
if(base_address_pos == NOTFOUND || base_address_end == NOTFOUND) continue;
char* base_address_str = substr(maps_file, base_address_pos, base_address_end - base_address_pos);
void* base_address = (void*)strtoptr(pid, base_address_str, NULL, 16);;
if (!base_address) return mod;
fprintf(stderr, "Base Address: %p\n", base_address);
//--- End Address
size_t end_address_pos;
size_t end_address_end;
char* end_address_str;
void* end_address;
//Get end address pos
end_address_pos = rfind(maps_file, module_path_str, 0);
end_address_pos = rfind(maps_file, "\n", end_address_pos) + 1;
end_address_pos = find(maps_file, "-", end_address_pos) + 1;
//Find first space from end_address_pos
end_address_end = find(maps_file, " ", end_address_pos);
if(end_address_pos == NOTFOUND || end_address_end == NOTFOUND) continue;
//End address substring
end_address_str = substr(maps_file, end_address_pos, end_address_end - end_address_pos);
end_address = (void*)strtoptr(pid, end_address_str, NULL, 16);
free(end_address_str);
fprintf(stderr, "End Address: %p\n", end_address);
//--- Module size
uintptr_t module_size = (uintptr_t)end_address - (uintptr_t)base_address;
fprintf(stderr, "End Address: %li\n", module_size);
mod.name = module_name_str;
mod.path = module_path_str;
mod.base = base_address;
mod.size = module_size;
mod.end = end_address;
break;
}
//--- Module Path
//---
//Now we put all the information we got into the mod structure
fclose(maps_file_fs);
return mod;
}
void freeModule(struct module_s* mod)
{
free(mod->name);
free(mod->path);
}
|
