def檔案&匯出函式&lib檔案關聯
阿新 • • 發佈:2019-02-02
lib /list xx.lib 列出lib裡所有obj檔名,我這裡如下
。。。。。很多省略
lib/err/err.obj
lib/dict/dictll.obj
lib/coreDump/coreDumpWin32.obj
lib/config/preference.obj
lib/config/configUL.obj
找到你關注的obj,這裡選擇configUL.obj,然後 lib /EXTRACT:lib/config/configUL.obj xx.lib
解出configUL.obj, 然後把obj拖入IDA,我這裡是ida5.5,在函式列表裡找你要呼叫的函式,然後逆之
_Config_GetString .text 00000068 00000039 R . . . B . .
_Config_GetBool .text 000000B8 00000039 R . . . B . .
_Config_GetLong .text 00000108 00000039 R . . . B . .
_Config_GetInt64 .text 00000158 0000003D R . . . B . .
_Config_GetTriState .text 00000198 00000039 R . . . B . .
_Config_GetDouble .text 000001E8 00000041 R . . . B T .
_Config_GetPathName .text 00000288 00000039 R . . . B . .
_Config_NotSet .text 000002C4 00000035 R . . . B . .
_Config_GetLongPlain .text 000003B0 00000015 . . . . . . .
_Panic UNDEF 000003D0 00000004 R . . . . . .
_Preference_GetString UNDEF 000003D4 00000004 R . . . . . .
_Str_Vsnprintf UNDEF 000003D8 00000004 R . . . . . .
_Preference_GetBool UNDEF 000003DC 00000004 R . . . . . .
_Preference_GetLong UNDEF 000003E0 00000004 R . . . . . .
_Preference_GetInt64 UNDEF 000003E4 00000004 R . . . . . .
_Preference_GetTriState UNDEF 000003E8 00000004 R . . . . . .
_Preference_GetDouble UNDEF 000003EC 00000004 R . . . . . .
_Preference_GetPathName UNDEF 000003F4 00000004 R . . . . . .
_Preference_NotSet UNDEF 000003F8 00000004 R . . . . . .
我這裡隨便選擇一個函式 _Config_GetString,很小的函式,呵呵,方便說明
.text:00000068 _Config_GetString proc near
.text:00000068
.text:00000068 var_400 = byte ptr -400h
.text:00000068 arg_0 = dword ptr 8
.text:00000068 arg_4 = dword ptr 0Ch
.text:00000068 arg_8 = byte ptr 10h
.text:00000068
.text:00000068 push ebp
.text:00000069 mov ebp, esp
.text:0000006B mov ecx, [ebp+arg_4]
.text:0000006E sub esp, 400h
.text:00000074 lea eax, [ebp+arg_8]
.text:00000077 push eax
.text:00000078 push ecx
.text:00000079 lea edx, [ebp+var_400]
.text:0000007F push 400h
.text:00000084 push edx
.text:00000085 call _Str_Vsnprintf
.text:0000008A mov ecx, [ebp+arg_0]
.text:0000008D lea eax, [ebp+var_400]
.text:00000093 push eax
.text:00000094 push ecx
.text:00000095 call _Preference_GetString
.text:0000009A add esp, 18h
.text:0000009D mov esp, ebp
.text:0000009F pop ebp
.text:000000A0 retn
.text:000000A0 _Config_GetString endp
這個函式很簡單,一看就知道功能了,格式化一個buffer,構建一個字串返回,
下面是是直接f5後修改的結果
int __cdecl Config_GetString(int a1, int a2, char *buf)
{
char buffer[0x400];
Str_Vsnprintf(buffer, sizeof(buffer), a2, buf);
return Preference_GetString(a1, &v4);
}
這種手法,搞個10個,8個的函式還行,多了會死人的,最好看了關鍵思路自己寫個來的更快