mirror of https://github.com/OpenRCT2/OpenRCT2.git
hook
This commit is contained in:
zsilencer
parent
44683a9246
commit
33ae29b11f
|
|
@ -0,0 +1,201 @@
|
|||
/*****************************************************************************
|
||||
* Copyright (c) 2014 Ted John
|
||||
* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
|
||||
*
|
||||
* This file is part of OpenRCT2.
|
||||
*
|
||||
* OpenRCT2 is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*****************************************************************************/
|
||||
|
||||
#include <windows.h>
|
||||
#include "hook.h"
|
||||
|
||||
void* g_hooktableaddress = 0;
|
||||
int g_hooktableoffset = 0;
|
||||
int g_maxhooks = 1000;
|
||||
|
||||
void hookfunc(int address, int newaddress, int stacksize, int registerargs[], int registersreturned)
|
||||
{
|
||||
int i = 0;
|
||||
char data[100];
|
||||
|
||||
int registerssaved = 7;
|
||||
int n = registersreturned;
|
||||
for (; n; registerssaved--) {
|
||||
n &= n - 1;
|
||||
}
|
||||
int numrargs = 0;
|
||||
for (int j = 0; ; j++) {
|
||||
if (registerargs[j] != END) {
|
||||
numrargs++;
|
||||
} else {
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
int rargssize = numrargs * 4;
|
||||
|
||||
data[i++] = 0x50; // push eax
|
||||
|
||||
// move stack down for possible existing arguments
|
||||
for (int j = 0; j < stacksize; j++) {
|
||||
data[i++] = 0x8B; // mov eax, [esp+x]
|
||||
data[i++] = 0x44;
|
||||
data[i++] = 0xE4;
|
||||
data[i++] = (signed char)((4 * (stacksize - j)) + 4);
|
||||
|
||||
data[i++] = 0x89; // mov [esp+x], eax
|
||||
data[i++] = 0x44;
|
||||
data[i++] = 0xE4;
|
||||
data[i++] = (signed char)((4 * (stacksize - j)) - ((registerssaved + stacksize) * 4));
|
||||
}
|
||||
|
||||
if (numrargs > 0) {
|
||||
// push the registers to be on the stack to access as arguments
|
||||
data[i++] = 0x83; // add esp, x
|
||||
data[i++] = 0xC4;
|
||||
data[i++] = -((registerssaved + stacksize) * 4) + 4;
|
||||
|
||||
for (signed int j = numrargs - 1; j >= 0; j--) {
|
||||
switch (registerargs[j]) {
|
||||
case EAX: data[i++] = 0x50; break;
|
||||
case EBX: data[i++] = 0x53; break;
|
||||
case ECX: data[i++] = 0x51; break;
|
||||
case EDX: data[i++] = 0x52; break;
|
||||
case ESI: data[i++] = 0x56; break;
|
||||
case EDI: data[i++] = 0x57; break;
|
||||
case EBP: data[i++] = 0x55; break;
|
||||
}
|
||||
}
|
||||
|
||||
data[i++] = 0x83; // add esp, x
|
||||
data[i++] = 0xC4;
|
||||
data[i++] = rargssize + ((registerssaved + stacksize) * 4) - 4;
|
||||
}
|
||||
|
||||
|
||||
data[i++] = 0xE8; // call
|
||||
data[i++] = 0x00;
|
||||
data[i++] = 0x00;
|
||||
data[i++] = 0x00;
|
||||
data[i++] = 0x00;
|
||||
|
||||
int sizec = i;
|
||||
|
||||
data[i++] = 0x8B; // push eax, [esp] - puts eip in eax
|
||||
data[i++] = 0x04;
|
||||
data[i++] = 0xE4;
|
||||
|
||||
data[i++] = 0x83; // add eax, x
|
||||
data[i++] = 0xC0;
|
||||
int sizeoffset = i;
|
||||
data[i++] = 0; // set to returnlocation offset later
|
||||
|
||||
data[i++] = 0x89; // mov [esp-20h], eax - put return address on stack
|
||||
data[i++] = 0x44;
|
||||
data[i++] = 0xE4;
|
||||
data[i++] = (signed char)(-(registerssaved * 4) - rargssize - (stacksize * 4)) + 4;
|
||||
|
||||
data[i++] = 0x83; // add esp, x
|
||||
data[i++] = 0xC4;
|
||||
data[i++] = 4;
|
||||
|
||||
data[i++] = 0x58; // pop eax
|
||||
|
||||
if (!(registersreturned & EAX)) {
|
||||
data[i++] = 0x50; // push eax
|
||||
}
|
||||
if (!(registersreturned & EBX)) {
|
||||
data[i++] = 0x53; // push ebx
|
||||
}
|
||||
if (!(registersreturned & ECX)) {
|
||||
data[i++] = 0x51; // push ecx
|
||||
}
|
||||
if (!(registersreturned & EDX)) {
|
||||
data[i++] = 0x52; // push edx
|
||||
}
|
||||
if (!(registersreturned & EBP)) {
|
||||
data[i++] = 0x55; // push ebp
|
||||
}
|
||||
if (!(registersreturned & ESI)) {
|
||||
data[i++] = 0x56; // push esi
|
||||
}
|
||||
if (!(registersreturned & EDI)) {
|
||||
data[i++] = 0x57; // push edi
|
||||
}
|
||||
|
||||
data[i++] = 0x83; // sub esp, x
|
||||
data[i++] = 0xEC;
|
||||
data[i++] = 4 + (stacksize * 4) + rargssize;
|
||||
|
||||
data[i++] = 0xEA; // jmp
|
||||
*((int *)&data[i]) = newaddress; i += 4;
|
||||
data[i++] = 0x23;
|
||||
data[i++] = 0x00;
|
||||
|
||||
data[sizeoffset] = i - sizec;
|
||||
|
||||
// returnlocation:
|
||||
|
||||
data[i++] = 0x83; // sub esp, x
|
||||
data[i++] = 0xEC;
|
||||
data[i++] = (signed char)(stacksize * -4) - rargssize;
|
||||
|
||||
if (!(registersreturned & EDI)) {
|
||||
data[i++] = 0x5F; // pop edi
|
||||
}
|
||||
if (!(registersreturned & ESI)) {
|
||||
data[i++] = 0x5E; // pop esi
|
||||
}
|
||||
if (!(registersreturned & EBP)) {
|
||||
data[i++] = 0x5D; // pop ebp
|
||||
}
|
||||
if (!(registersreturned & EDX)) {
|
||||
data[i++] = 0x5A; // pop edx
|
||||
}
|
||||
if (!(registersreturned & ECX)) {
|
||||
data[i++] = 0x59; // pop ecx
|
||||
}
|
||||
if (!(registersreturned & EBX)) {
|
||||
data[i++] = 0x5B; // pop ebx
|
||||
}
|
||||
if (!(registersreturned & EAX)) {
|
||||
data[i++] = 0x58; // pop eax
|
||||
}
|
||||
|
||||
data[i++] = 0xC3; // retn
|
||||
|
||||
WriteProcessMemory(GetCurrentProcess(), (LPVOID)address, data, i, 0);
|
||||
}
|
||||
|
||||
void addhook(int address, int newaddress, int stacksize, int registerargs[], int registersreturned)
|
||||
{
|
||||
if (!g_hooktableaddress) {
|
||||
g_hooktableaddress = VirtualAllocEx(GetCurrentProcess(), NULL, g_maxhooks * 100, MEM_COMMIT, PAGE_EXECUTE_READWRITE);
|
||||
}
|
||||
if (g_hooktableoffset > g_maxhooks) {
|
||||
return;
|
||||
}
|
||||
unsigned int hookaddress = (unsigned int)g_hooktableaddress + (g_hooktableoffset * 100);
|
||||
char data[9];
|
||||
int i = 0;
|
||||
data[i++] = 0xEA; // jmp
|
||||
*((int *)&data[i]) = hookaddress; i += 4;
|
||||
data[i++] = 0x23;
|
||||
data[i++] = 0x00;
|
||||
data[i++] = 0xC3; // retn
|
||||
WriteProcessMemory(GetCurrentProcess(), (LPVOID)address, data, i, 0);
|
||||
hookfunc(hookaddress, newaddress, stacksize, registerargs, registersreturned);
|
||||
g_hooktableoffset++;
|
||||
}
|
||||
|
|
@ -0,0 +1,41 @@
|
|||
/*****************************************************************************
|
||||
* Copyright (c) 2014 Ted John
|
||||
* OpenRCT2, an open source clone of Roller Coaster Tycoon 2.
|
||||
*
|
||||
* This file is part of OpenRCT2.
|
||||
*
|
||||
* OpenRCT2 is free software: you can redistribute it and/or modify
|
||||
* it under the terms of the GNU General Public License as published by
|
||||
* the Free Software Foundation, either version 3 of the License, or
|
||||
* (at your option) any later version.
|
||||
|
||||
* This program is distributed in the hope that it will be useful,
|
||||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
||||
* GNU General Public License for more details.
|
||||
|
||||
* You should have received a copy of the GNU General Public License
|
||||
* along with this program. If not, see <http://www.gnu.org/licenses/>.
|
||||
*****************************************************************************/
|
||||
|
||||
#ifndef _HOOK_H_
|
||||
#define _HOOK_H_
|
||||
|
||||
extern void* g_hooktableaddress;
|
||||
extern int g_hooktableoffset;
|
||||
extern int g_maxhooks;
|
||||
|
||||
enum REGISTER_ARGS {
|
||||
EAX = 1 << 0,
|
||||
EBX = 1 << 1,
|
||||
ECX = 1 << 2,
|
||||
EDX = 1 << 3,
|
||||
ESI = 1 << 4,
|
||||
EDI = 1 << 5,
|
||||
EBP = 1 << 6,
|
||||
END = 0
|
||||
};
|
||||
|
||||
void addhook(int address, int newaddress, int stacksize, int registerargs[], int registersreturned);
|
||||
|
||||
#endif
|
||||
Loading…
Reference in New Issue