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Blockable change team hook [message #469929] Tue, 26 June 2012 11:57 Go to next message
iRANian is currently offline  iRANian
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Could a blockable team change hook be added?

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Re: Blockable change team hook [message #470127 is a reply to message #469929] Thu, 28 June 2012 02:30 Go to previous messageGo to next message
StealthEye is currently offline  StealthEye
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TT hooks the event at 0x004B4910, you can hook that place yourself and call the TT hook function iff you don't want it to be blocked.

It's not too hard to make a proper hook for it though, so I'll add it to the TODO.


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Re: Blockable change team hook [message #470131 is a reply to message #469929] Thu, 28 June 2012 02:42 Go to previous messageGo to next message
iRANian is currently offline  iRANian
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I guess I could try that out, I've never modified a hook like that so it sounds challenging.

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: Thu, 28 June 2012 03:16]

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Re: Blockable change team hook [message #470143 is a reply to message #469929] Thu, 28 June 2012 05:34 Go to previous message
iRANian is currently offline  iRANian
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Done, took me a bit to figure the displacement out. :/

Doesn't trigger on TEAM2 and TEAM but you can just replace them (and have them call the original console commands):

Hook *TeamChangeHook = new Hook;
int TTHookAddress = 0;

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

void _declspec(naked) TeamChangeHook_Glue()
{
	_asm
	{

		mov  edi, ecx
		push [edi+6B4h]
		call ChangeTeamHook
		add esp, 4;
		mov ecx, edi

		test al, al
		jz BlockTeamChange

		mov edi, TTHookAddress
		jmp edi

BlockTeamChange:
		retn
	}
}

Toys::Toys()
{
	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(OpCodeBuffer)); // 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
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