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#include "Daodan_Patch.h" |
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#include "Patches/Utility.h" |
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#include <beaengine/BeaEngine.h> |
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|
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#include <windows.h> |
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#include <stdlib.h> |
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#include <string.h> |
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|
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bool DDrPatch_MakeJump(void* from, void* to) |
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{ |
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DWORD oldp; |
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|
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if (VirtualProtect(from, 5, PAGE_EXECUTE_READWRITE, &oldp)) |
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{ |
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*((unsigned char*)from) = 0xe9; // jmp rel32 |
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from = (char*)from + 1; |
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*(int*)from = (unsigned int)to - (unsigned int)from - 4; |
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VirtualProtect(from, 5, oldp, &oldp); |
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return true; |
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} |
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else |
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return false; |
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} |
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|
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bool DDrPatch_MakeCall(void* from, void* to) |
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{ |
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DWORD oldp; |
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|
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if (VirtualProtect(from, 5, PAGE_EXECUTE_READWRITE, &oldp)) |
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{ |
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*((unsigned char*)from) = 0xe8; // call rel32 |
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from = (char*)from + 1; |
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*(int*)from = (unsigned int)to - (unsigned int)from - 4; |
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VirtualProtect(from, 5, oldp, &oldp); |
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return true; |
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} |
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else |
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return false; |
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} |
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|
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void* DDrPatch_MakeDetour(void* from, void* to) |
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{ |
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int len = 0; |
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|
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/* |
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STARTUPMESSAGE("Orig before", 0); |
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DDrPatch_PrintDisasm(from, 10, 0); |
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*/ |
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DISASM disasm; |
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memset(&disasm, 0, sizeof(DISASM)); |
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disasm.EIP = (UIntPtr) from; |
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|
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char* trampoline = malloc(40); |
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DDrPatch_NOOP(trampoline, 40); |
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int pos = 0; |
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int branches = 0; |
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|
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while (((void*)disasm.EIP - from) < 5) { |
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len = Disasm(&disasm); |
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if (len != UNKNOWN_OPCODE) { |
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if ((disasm.Instruction.Category & 0xffff) == CONTROL_TRANSFER) { |
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if (disasm.Prefix.Number > 0) { |
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STARTUPMESSAGE("Detour: Branch in trampoline area from address 0x%08x with prefixes", from); |
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return (void*)-1; |
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} |
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branches++; |
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int target = disasm.Instruction.AddrValue; |
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bool targetInTrampoline = ((void*)disasm.Instruction.AddrValue - from) < 5; |
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switch (disasm.Instruction.BranchType) { |
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case JmpType: |
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case CallType: |
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if (targetInTrampoline) { |
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int offset = disasm.Instruction.AddrValue - disasm.EIP; |
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if (disasm.Instruction.BranchType == JmpType) |
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DDrPatch_MakeJump(&trampoline[pos], &trampoline[pos]+offset); |
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else |
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DDrPatch_MakeCall(&trampoline[pos], &trampoline[pos]+offset); |
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} else { |
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if (disasm.Instruction.BranchType == JmpType) |
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DDrPatch_MakeJump(&trampoline[pos], (void*)target); |
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else |
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DDrPatch_MakeCall(&trampoline[pos], (void*)target); |
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} |
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pos += 5; |
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break; |
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case RetType: |
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case JECXZ: |
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memcpy(&trampoline[pos], (void*)disasm.EIP, len); |
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pos += len; |
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break; |
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// Opcode +1 |
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case JO: |
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case JC: |
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case JE: |
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case JNA: |
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case JS: |
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case JP: |
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case JL: |
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case JNG: |
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if (targetInTrampoline) { |
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memcpy(&trampoline[pos], (void*)disasm.EIP, len); |
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pos += len; |
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} else { |
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trampoline[pos++] = disasm.Instruction.Opcode + 1; |
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trampoline[pos++] = 5; |
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DDrPatch_MakeJump(&trampoline[pos], (void*)target); |
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pos += 5; |
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} |
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break; |
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// Opcode -1 |
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case JNO: |
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case JNC: |
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case JNE: |
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case JA: |
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case JNS: |
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case JNP: |
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case JNL: |
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case JG: |
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if (targetInTrampoline) { |
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memcpy(&trampoline[pos], (void*)disasm.EIP, len); |
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pos += len; |
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} else { |
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trampoline[pos++] = disasm.Instruction.Opcode - 1; |
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trampoline[pos++] = 5; |
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DDrPatch_MakeJump(&trampoline[pos], (void*)target); |
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pos += 5; |
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} |
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break; |
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default: |
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STARTUPMESSAGE("Detour: Unknown branch in trampoline area from address 0x%08x", from); |
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return (void*)-1; |
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} |
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} else { |
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memcpy(&trampoline[pos], (void*)disasm.EIP, len); |
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pos += len; |
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} |
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disasm.EIP += (UIntPtr)len; |
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} |
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else { |
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STARTUPMESSAGE("Detour: Unknown opcode in trampoline area from address 0x%08x", from); |
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return (void*)-1; |
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} |
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} |
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|
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if (branches > 1) { |
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STARTUPMESSAGE("Detour: Too many branches in trampoline'd code from address 0x%08x: %d", from, branches); |
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return (void*)-1; |
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} |
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|
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|
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DDrPatch_MakeJump(&trampoline[pos], (void*)disasm.EIP); |
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DDrPatch_NOOP(from, (void*)disasm.EIP - from); |
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|
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DWORD oldp; |
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if (!VirtualProtect(trampoline, 40, PAGE_EXECUTE_READWRITE, &oldp)) { |
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STARTUPMESSAGE("Detour: Could not mark page for trampoline as executable: from address 0x%08x", from); |
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return (void*)-1; |
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} |
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DDrPatch_MakeJump(from, to); |
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|
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/* |
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STARTUPMESSAGE("Trampoline", 0); |
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DDrPatch_PrintDisasm(trampoline, 10, 6); |
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|
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STARTUPMESSAGE("Orig after", 0); |
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DDrPatch_PrintDisasm(disasm.EIP, 7, 0); |
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|
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STARTUPMESSAGE("Orig start after", 0); |
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DDrPatch_PrintDisasm(from, 3, 6); |
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*/ |
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return trampoline; |
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} |
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|
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bool DDrPatch_String(char* dest, const unsigned char* string, int length) |
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{ |
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DWORD oldp; |
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|
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if (VirtualProtect(dest, length, PAGE_EXECUTE_READWRITE, &oldp)) |
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{ |
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memcpy(dest, string, length); |
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VirtualProtect(dest, length, oldp, &oldp); |
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return true; |
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} |
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else |
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return false; |
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} |
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|
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bool DDrPatch_Byte(char* dest, unsigned char value) |
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{ |
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DWORD oldp; |
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|
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if (VirtualProtect(dest, 1, PAGE_EXECUTE_READWRITE, &oldp)) |
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{ |
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*dest = value; |
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VirtualProtect(dest, 1, oldp, &oldp); |
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return true; |
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} |
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else |
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return false; |
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} |
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|
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bool DDrPatch_Int32(int* dest, unsigned int value) |
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{ |
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DWORD oldp; |
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|
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if (VirtualProtect(dest, 4, PAGE_EXECUTE_READWRITE, &oldp)) |
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{ |
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*dest = value; |
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VirtualProtect(dest, 4, oldp, &oldp); |
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return true; |
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} |
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else |
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return false; |
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} |
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|
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bool DDrPatch_Int16(short* dest, unsigned short value) |
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{ |
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DWORD oldp; |
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|
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if (VirtualProtect(dest, 2, PAGE_EXECUTE_READWRITE, &oldp)) |
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{ |
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*dest = value; |
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VirtualProtect(dest, 2, oldp, &oldp); |
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return true; |
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} |
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else |
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return false; |
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} |
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|
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bool DDrPatch_NOOP(char* dest, unsigned int length) |
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{ |
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DWORD oldp; |
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|
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if (VirtualProtect(dest, length, PAGE_EXECUTE_READWRITE, &oldp)) |
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{ |
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memset(dest, 0x90, length); |
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VirtualProtect(dest, length, oldp, &oldp); |
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return true; |
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} |
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else |
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return false; |
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} |
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|
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|
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void DDrPatch_PrintDisasm(void* addr, int instLimit, int sizeLimit) |
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{ |
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DISASM MyDisasm; |
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int len = 0; |
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int size = 0; |
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int i = 0; |
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|
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memset(&MyDisasm, 0, sizeof(DISASM)); |
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|
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MyDisasm.EIP = (UIntPtr) addr; |
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|
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STARTUPMESSAGE("", 0); |
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STARTUPMESSAGE("Disassembly @ 0x%06x", addr); |
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|
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if (sizeLimit <= 0) |
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sizeLimit = 20 * instLimit; |
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|
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while ((i < instLimit) && (size < sizeLimit)) { |
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len = Disasm(&MyDisasm); |
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if (len != UNKNOWN_OPCODE) { |
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size += len; |
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STARTUPMESSAGE(" %s, Opcode: 0x%x, len: %d, branch: %d, to: 0x%06x", MyDisasm.CompleteInstr, MyDisasm.Instruction.Opcode, len, MyDisasm.Instruction.BranchType, MyDisasm.Instruction.AddrValue); |
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STARTUPMESSAGE(" Cat: 0x%04x, prefix count: %d", MyDisasm.Instruction.Category & 0xffff, MyDisasm.Prefix.Number ); |
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|
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MyDisasm.EIP += (UIntPtr)len; |
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i++; |
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} |
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}; |
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|
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STARTUPMESSAGE("", 0); |
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} |
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|
