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fix function signature / cleanup

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This commit is contained in:
Peter Repukat 2016-11-27 16:46:41 +01:00
parent 56edf5bad4
commit 4d2c8a544a
1 changed files with 27 additions and 22 deletions
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49
EnforceBindingDLL/EnforceBindings.cpp
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@ -17,58 +17,60 @@ limitations under the License.
//stuff for finding the function as well as the injected code //stuff for finding the function as well as the injected code
//should probably be moved somewhere else //should probably be moved somewhere else
DWORD address = 0x381FA91B; DWORD address;
DWORD JMPBack; DWORD JMPBack;
int32_t currentBindings; int32_t currentBindings;
const int32_t desktopBindingsID = 413080; //desktop_config appid const int32_t desktopBindingsID = 413080; //desktop_config appid
const int32_t bigPictureBindingsID = 413090; //desktop_config appid const int32_t bigPictureBindingsID = 413090; //big_picture_config appid
const int32_t steamChordBindingsID = 443510; //desktop_config appid const int32_t steamChordBindingsID = 443510; //steam_chord_config appid
int32_t enforceBindingsID = 413080; //0x80000009; int32_t enforceBindingsID = 413080;
char originalBytes[] = "\x8B\x45\x0c\x57\x8B\x7D\x08"; char originalBytes[] = "\x8B\x45\x0c\x57\x8B\x7D\x08\x3D\x76\xC4\x06\x00"; //original assembly code of steamclient.dll that we want to hook
char mask[] = "xxxxxxxx????"; //mask for searching
__declspec(naked) void enforceBindingsHookFn() __declspec(naked) void enforceBindingsHookFn()
{ {
__asm __asm
{ {
mov eax, dword ptr ss : [ebp + 0xc] mov eax, dword ptr ss : [ebp + 0xc] //part of original steam code - appId of bindings to be switched gets moved into eax register
mov currentBindings, eax mov currentBindings, eax //move into "currentBindings" variable
} }
if (currentBindings != desktopBindingsID if (currentBindings != desktopBindingsID //if the current bindings aren't desktop, big picture, or steam-chord bindings
&& currentBindings != bigPictureBindingsID && currentBindings != bigPictureBindingsID //they have to be our game bindings
&& currentBindings != steamChordBindingsID) && currentBindings != steamChordBindingsID) //we can grab theme here, because bindings switch, after we have injected and the target changes focuses window
{ {
enforceBindingsID = currentBindings; enforceBindingsID = currentBindings;
} }
if (currentBindings == desktopBindingsID) if (currentBindings == desktopBindingsID) //if steam wants to set desktop-bindings
{ {
__asm __asm
{ {
mov eax, enforceBindingsID mov eax, enforceBindingsID //move appid of bindings to enforce into eax register
} }
} }
__asm __asm
{ {
push edi push edi //part of original steam code
mov edi, dword ptr ss : [ebp + 0x8] mov edi, dword ptr ss : [ebp + 0x8] //part of original steam code
jmp[JMPBack] cmp eax, 0x6C476 //part of original steam code - checks if bindings to be set are steamchord bindings
} jmp[JMPBack] //jump back and continiue with original steam function
} //note: zero flag doesn't get altered by jmp instruction, previous compare still works fine
} }
//\\\ //\\\
void EnforceBindings::patchBytes() void EnforceBindings::patchBytes()
{ {
address = FindPattern("steamclient.dll", originalBytes, "xxxxxxx"); address = FindPattern("steamclient.dll", originalBytes, mask);
JMPBack = address + 0x7; //7 size of pattern/mask == patched instructions JMPBack = address + 12; //12 size of pattern/mask == patched instructions
PlaceJMP((BYTE*)address, (DWORD)enforceBindingsHookFn, 7); PlaceJMP((BYTE*)address, (DWORD)enforceBindingsHookFn, 12);
} }
void EnforceBindings::Unpatch() void EnforceBindings::Unpatch()
{ {
RestoreBytes((BYTE*)address, (BYTE*)originalBytes, 7); RestoreBytes((BYTE*)address, (BYTE*)originalBytes, 12);
} }
@ -77,8 +79,10 @@ void EnforceBindings::Unpatch()
//places a jmp instruction to a __declspec(naked) function on a given adress
void EnforceBindings::PlaceJMP(BYTE * Address, DWORD jumpTo, DWORD lenght) //nops the rest of bytes to don't break any instructions
//part of patched code may has to be executed in the hook function
void EnforceBindings::PlaceJMP(BYTE * Address, DWORD jumpTo, DWORD lenght)
{ {
DWORD dwOldProtect, dwBkup, dwReloadAddr; DWORD dwOldProtect, dwBkup, dwReloadAddr;
VirtualProtect(Address, lenght, PAGE_EXECUTE_READWRITE, &dwOldProtect); VirtualProtect(Address, lenght, PAGE_EXECUTE_READWRITE, &dwOldProtect);
@ -116,6 +120,7 @@ MODULEINFO EnforceBindings::GetModInfo(char * szModule)
return ret; return ret;
} }
//returns memory address of given pattern ind given module
DWORD EnforceBindings::FindPattern(char * module, char * pattern, char * mask) DWORD EnforceBindings::FindPattern(char * module, char * pattern, char * mask)
{ {
MODULEINFO mInfo = GetModInfo(module); MODULEINFO mInfo = GetModInfo(module);