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[CODE] Blockable Team Change hook [message #470568] Mon, 02 July 2012 14:57 Go to next message
iRANian is currently offline  iRANian
Messages: 4300
Registered: April 2011
Karma: 0
General (4 Stars)
For those who missed me posting it in the TT forums. Doesn't trigger on TEAM or TEAM2 so just replace those with a custom version.

Hook *TeamChangeHook = new Hook;
int TTHookAddress = 0; // Will be loaded with the calculated address of script 4.0's suicide hook code

bool __cdecl ChangeTeamHook(int ID)
{
	Console_Output("derppppp = %d\n", ID);
	return true;
}

void _declspec(naked) TeamChangeHook_Glue()
{
	_asm
	{
		mov  edi, ecx // save ecx

		push [edi+6B4h] // First argument, the ID of the player attempting to suicide
		call ChangeTeamHook
		add esp, 4; // Manually re-align the stack (our hook is __cdecl)

		mov ecx, edi // restore ecx

		test al, al // Check the return value of our hook
		jz BlockTeamChange // If the return value is zero (return false), jump to BlockTeamChange

		mov edi, TTHookAddress // Otherwise move the address of scripts 4.0's hook
		jmp edi // And jump to it

BlockTeamChange:
		retn // Return immediately without doing the team change
	}
}

int Calculate_Address_From_Displacement(int JMPStartAddress)
{
	char OpCodes[5];
	int Displacement, Address;

	Hooking::ReadMemory(JMPStartAddress, OpCodes, 5); // 0x004B4910 is where the JMP opcode (E9) starts, next 4 are the displacement/relative address

	memcpy(&Displacement, OpCodes+1, sizeof(char)*4); // OpCodeBuffer+1 or we'll also read the JMP opcode

	Address = JMPStartAddress + 5 + Displacement;
	return Address;
}

	char OpCodeBuffer[5];
	Hooking::ReadMemory(0x004B4910, OpCodeBuffer, 5); // 0x004B4910 is where the JMP opcode (E9) starts, next 4 are the displacement/relative address

	int Displacement;
	memcpy(&Displacement, OpCodeBuffer+1, sizeof(char)*4); // OpCodeBuffer+1 or we'll also read the JMP opcode

	TTHookAddress = 0x004B4910 + 5 + Displacement;
	Console_Output("displacement = %x, function address = 0x%X\n", Displacement, TTHookAddress);

	TeamChangeHook->Install('\xE9', 0x004B4910, (int)&TeamChangeHook_Glue, "");


Long time and well respected Renegade community member, programmer, modder and tester.

Scripts 4.0 private beta tester since May 2011.

My Renegade server plugins releases

[Updated on: Tue, 03 July 2012 00:33]

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Re: [CODE] Blockable Team Change hook [message #470602 is a reply to message #470568] Tue, 03 July 2012 00:15 Go to previous messageGo to next message
Gen_Blacky is currently offline  Gen_Blacky
Messages: 3250
Registered: September 2006
Karma: 1
General (3 Stars)
Server crashes if you return true.

http://s18.postimage.org/jc6qbn4k9/bricks3.png
Re: [CODE] Blockable Team Change hook [message #470605 is a reply to message #470568] Tue, 03 July 2012 00:34 Go to previous messageGo to next message
iRANian is currently offline  iRANian
Messages: 4300
Registered: April 2011
Karma: 0
General (4 Stars)
I've updated the code I posted, try again, I just tested the code and it works with return true.

Long time and well respected Renegade community member, programmer, modder and tester.

Scripts 4.0 private beta tester since May 2011.

My Renegade server plugins releases
Re: [CODE] Blockable Team Change hook [message #470609 is a reply to message #470568] Tue, 03 July 2012 01:18 Go to previous messageGo to next message
iRANian is currently offline  iRANian
Messages: 4300
Registered: April 2011
Karma: 0
General (4 Stars)
Blacky confirmed it's working now when I spoke to him.

Long time and well respected Renegade community member, programmer, modder and tester.

Scripts 4.0 private beta tester since May 2011.

My Renegade server plugins releases
Re: [CODE] Blockable Team Change hook [message #470611 is a reply to message #470568] Tue, 03 July 2012 01:21 Go to previous messageGo to next message
Gen_Blacky is currently offline  Gen_Blacky
Messages: 3250
Registered: September 2006
Karma: 1
General (3 Stars)
Lies, but it works.

http://s18.postimage.org/jc6qbn4k9/bricks3.png

[Updated on: Tue, 03 July 2012 01:21]

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Re: [CODE] Blockable Team Change hook [message #470637 is a reply to message #470568] Tue, 03 July 2012 08:06 Go to previous message
Gen_Blacky is currently offline  Gen_Blacky
Messages: 3250
Registered: September 2006
Karma: 1
General (3 Stars)
Hook *TeamChangeHook = new Hook;
int TeamChangeHookAddress = 0;

void Console(const char *Format, ...)
{
	char buffer[256];
	va_list va;
	_crt_va_start(va, Format);
	vsnprintf(buffer, 256, Format, va);
	va_end(va);
	Console_Input(buffer);
}

bool __cdecl ChangeTeamHook(int ID)
{
	int GDIPlayers = (Tally_Team_Size(1));
	int NodPlayers = (Tally_Team_Size(0));
	int difference = GDIPlayers - NodPlayers;
	int Team = Find_Player(ID)->Get_Player_Type();
	StringClass side;
	if ( Team == 0 ) 
	{ 
		side = "GDI";
		Team = 1;
	}
	else 
	{  
		side = "Nod";
		Team = 0;
	}

	if ( GDIPlayers == NodPlayers )
	{
		Console("ppage %d Teams are Even!", ID);
		return false;
	}
	else if ( difference == 1 && NodPlayers != 0)
	{
		Console("ppage %d GDI only has one more player then Nod!", ID);
		return false;
	}
	else if ( difference == -1 && GDIPlayers != 0)
	{
		Console("ppage %d Nod only has one more player then GDI!", ID);
		return false;
	}
	else if ( GDIPlayers > NodPlayers && Team == 1 )
	{
		Console("ppage %d GDI has more player's then Nod!", ID);
		return false;
	}
	else if ( GDIPlayers < NodPlayers && Team == 0 )
	{
		Console("ppage %d Nod has more player's then GDI!", ID);
		return false;
	}

	Change_Team(Get_GameObj(ID), Team);
	Console_Output("%S Changed to Team %s\n", Find_Player(ID)->PlayerName, side);
	Console("msg %S Changed to Team %s\n", Find_Player(ID)->PlayerName, side);
	Find_Player(ID)->Set_Deaths(Find_Player(ID)->Get_Deaths() - 1 );
	return false;
}

void _declspec(naked) TeamChangeHook_Glue()
{
	_asm
	{
		mov  edi, ecx // save ecx

		push [edi+6B4h] // First argument, the ID of the player attempting to suicide
		call ChangeTeamHook
		add esp, 4; // Manually re-align the stack (our hook is __cdecl)

		mov ecx, edi // restore ecx

		test al, al // Check the return value of our hook
		jz BlockTeamChange // If the return value is zero (return false), jump to BlockTeamChange

		mov edi, TeamChangeHookAddress // Otherwise move the address of scripts 4.0's hook
		jmp edi // And jump to it

BlockTeamChange:
		retn // Return immediately without doing the team change
	}
}

int Calculate_Address_From_Displacement(int JMPStartAddress)
{
	char OpCodes[5];
	int Displacement, Address;

	Hooking::ReadMemory(JMPStartAddress, OpCodes, 5); // 0x004B4910 is where the JMP opcode (E9) starts, next 4 are the displacement/relative address

	memcpy(&Displacement, OpCodes+1, sizeof(char)*4); // OpCodeBuffer+1 or we'll also read the JMP opcode

	Address = JMPStartAddress + 5 + Displacement;
	return Address;
}

TeamChangeHookAddress = Calculate_Address_From_Displacement(0x004B4910);
Console_Output("[HOOK] TT TeamChangeHook address = 0x%X\n", TeamChangeHookAddress);
TeamChangeHook->Install('\xE9', 0x004B4910, (int)&TeamChangeHook_Glue, "");


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