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145 lines
4.1 KiB
C++
145 lines
4.1 KiB
C++
/*
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Copyright 2018-2019 Peter Repukat - FlatspotSoftware
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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#include "EnforceBindings.h"
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#include <vector>
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#include <string>
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#include "../common/common_hookfuns.h"
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//stuff for finding the function as well as the injected code
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//should probably be moved somewhere else
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DWORD address = NULL;
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DWORD JMPBack;
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int32_t currentBindings;
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const int32_t desktopBindingsID = 413080; //desktop_config appid
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const int32_t bigPictureBindingsID = 413090; //big_picture_config appid
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const int32_t steamChordBindingsID = 443510; //steam_chord_config appid
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int32_t enforceBindingsID = 413080;
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std::string fun_prolog = "\x55\x8B\xEC\x83\xEC\x10";
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////////////////////////////////// CODE ///////////////////////////////////////////
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__declspec(naked) void generalized_hookFn()
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{
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//excute original function prolog
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__asm
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{
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push ebp
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mov ebp, esp
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sub esp, 0x10
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}
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//our hook code...
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__asm
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{
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mov eax, dword ptr ss : [ebp + 0xC] //move second function argument (bindings to set) in eax
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mov currentBindings, eax //move bindings to set in variable
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}
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if (currentBindings != desktopBindingsID //if the current bindings aren't desktop, big picture, or steam-chord bindings
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&& currentBindings != bigPictureBindingsID //they have to be our game bindings
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&& currentBindings != steamChordBindingsID) //we can grab them here, because bindings switch right after we have injected and the target changes focused window
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{
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enforceBindingsID = currentBindings;
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}
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if (currentBindings == desktopBindingsID) //if steam wants to set desktop-bindings
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{
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__asm
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{
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mov eax, enforceBindingsID //move appid of bindings to enforce into eax register
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mov dword ptr ss : [ebp + 0xC], eax //patch function argument
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}
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}
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//jump back
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__asm
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{
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jmp[JMPBack] //jump back and continiue with original steam function
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}
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}
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void EnforceBindings::patchBytes()
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{
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address = FindHookFunctionAdress();
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if (address != NULL)
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{
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JMPBack = address + fun_prolog.length();
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hook_commons::PlaceJMP((BYTE*)address, (DWORD)generalized_hookFn, fun_prolog.length());
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}
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}
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void EnforceBindings::Unpatch()
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{
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if (address != NULL)
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{
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hook_commons::RestoreBytes((BYTE*)address, (BYTE*)fun_prolog.c_str(), fun_prolog.length());
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}
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}
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/*
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* Search for address of functrion we want to hook
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*
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* In the function we want to hook the appID of the Chord bindings get referenced,
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* it takes 3 arguments (we can get that from the function prolog)
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* and it is the only one that does both. (in steamclient.dll)
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*
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* We search for the constant appID of SteamChard bindings
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* move a bit upward and search for the correct function prolog (which will get patched in our hook function)
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*
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*/
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DWORD EnforceBindings::FindHookFunctionAdress()
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{
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MODULEINFO mInfo = hook_commons::GetModInfo("steamclient.dll");
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DWORD baseAddr = (DWORD)mInfo.lpBaseOfDll;
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DWORD size = mInfo.SizeOfImage;
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char pattern[4];
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pattern[3] = (steamChordBindingsID >> 24) & 0xFF;
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pattern[2] = (steamChordBindingsID >> 16) & 0xFF;
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pattern[1] = (steamChordBindingsID >> 8) & 0xFF;
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pattern[0] = steamChordBindingsID & 0xFF;
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for (DWORD i = 0; i < size - 4; i++)
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{
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bool found = true;
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for (DWORD j = 0; j < 4; j++)
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found &= pattern[j] == *(char*)(baseAddr + j + i);
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if (found)
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{
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DWORD addr = baseAddr + i;
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DWORD funStartSearchOffset = addr - 256;
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for (DWORD k = 0; k < 256; k++)
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{
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bool found2 = true;
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for (DWORD l = 0; l < fun_prolog.length(); l++)
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found2 &= fun_prolog[l] == *(char*)(funStartSearchOffset + l + k);
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if (found2)
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return funStartSearchOffset + k;
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}
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}
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}
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return NULL;
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}
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