samp-re/rakpeer.c

/* vim: set filetype=c ts=8 noexpandtab: */

//#define COMPRESS_PRINT

#include "common.h"
#include "rakpeer.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>

__declspec(naked)
int __stdcall RakPeer__GetIndexFromPlayerID(
	struct CRakPeer *this,
	struct PlayerID playerId,
	char calledFromNetworkThread)
{
	_asm {
		pop eax
		pop ecx
		push eax
		mov eax, 0x453A40
		jmp eax
	}
}

__declspec(naked)
int __stdcall RakPeer__AddPacketToProducer(
	struct CRakPeer *this,
	struct CPacket *packet)
{
	_asm {
		pop eax
		pop ecx
		push eax
		mov eax, 0x4523D0
		jmp eax
	}
}

__declspec(naked)
int __stdcall RakPeer__AssignPlayerIDToRemoteSystemList(
	struct CRakPeer *this,
	struct PlayerID playerId,
	int connectionMode)
{
	_asm {
		pop eax
		pop ecx
		push eax
		mov eax, 0x455E00
		jmp eax
	}
}

__declspec(naked)
struct CRemoteSystem* __stdcall RakPeer__GetRemoteSystemFromPlayerID(
	struct CRakPeer *this,
	struct PlayerID playerId,
	char calledFromNetworkThread,
	char onlyActive)
{
	_asm {
		pop eax
		pop ecx
		push eax
		mov eax, 0x453AF0
		jmp eax
	}
}

static
int __declspec(naked) RakPeer__OnConnectionRequest(
	struct CRakPeer *this, 
	struct CRemoteSystem *remoteSystem,
	char *AESKey,
	char setAESkey)
{
	_asm {
		mov eax, esp
		pop ecx
		push [eax+0x10] /*setAESKey*/
		push [eax+0xC] /*AESKey*/
		push [eax+0x8] /*remoteSystem*/
		push ecx /*return address*/
		mov ecx, [eax+0x4] /*this*/
		mov eax, 0x455A60
		jmp eax
	}
}

__declspec(naked)
unsigned int __stdcall RakPeer__GetTime()
{
	_asm {
		mov eax, 0x44E9D0
		jmp eax
	}
}

static
void __declspec(naked) RakPeer__SendImmediate(
	struct CRakPeer *this,
	char *data,
	int numberOfBitsToSend,
	int priority,
	int reliability,
	int orderingChannel,
	struct PlayerID playerId,
	int broadcast,
	int useCallerDataAllocation,
	unsigned int currentTime)
{
	_asm {
		mov eax, esp
		pop ecx
		push [eax+0x30] // currentTimeDummy
		push [eax+0x2C] // currentTime
		push [eax+0x28] // useCallerDataAllocation
		push [eax+0x24] // broadcast
		push [eax+0x20] // playerId
		push [eax+0x1C] // playerId
		push [eax+0x18] // orderingChannel
		push [eax+0x14] // reliability
		push [eax+0x10] // priority
		push [eax+0xC] // numberOfBitsToSend
		push [eax+0x8] // data
		push ecx /*return address*/
		mov ecx, [eax+0x4] /*this*/
		mov eax, 0x453C60
		jmp eax
	}
}

static
short __declspec(naked) RakPeer__AllowIncomingConnectionsInternal(
	struct CRakPeer *this)
{
	_asm {
		mov ecx, [esp+0x4]
		mov eax, 0x4509D0
		call eax
		ret
	}
}

static
void RakPeer__ParseConnectionRequestPacketInternal(
	struct CRakPeer *this,
	struct CRemoteSystem *remoteSystem,
	struct PlayerID playerId,
	char *data,
	char byteSize)
{
	unsigned char responseData;
	char *clientPass;
	int clientPassLen;
	char tmpPlayerDebugPassword[256];

	printf("ParseConnectionRequestPacket start\n");
	if (!RakPeer__AllowIncomingConnectionsInternal(this)) {
		printf("server is full\n");
		responseData = ID_NO_FREE_INCOMING_CONNECTIONS;
		goto sendimmediateresponse;
	}

	printf("checking password requirements\n");
	clientPassLen = byteSize - sizeof(char);
	clientPass = data + sizeof(char);
	if (this->incomingPasswordLength != clientPassLen) {
		printf("incorrect password length\n");
		printf("client: %d server: %d\n",
			clientPassLen, this->incomingPasswordLength);
		goto kickplayer;
	}
	if (memcmp(this->incomingPassword, clientPass, clientPassLen) != 0) {
		printf("non-matching password\n");
		/*temp copy player password to print, because it's not zero
		termd*/
		memcpy(tmpPlayerDebugPassword, clientPass, clientPassLen);
		tmpPlayerDebugPassword[clientPassLen] = 0;
		printf("client: %s server: %s\n",
			tmpPlayerDebugPassword, this->incomingPassword);
		goto kickplayer;
	}
	printf("password check passed\n");

	/*security is not used*/
	/*if (this->usingSecurity) {
		printf("using security\n");
		//SecuredConnectionResponse(playerId);
		goto ret;
	}*/
	RakPeer__OnConnectionRequest(this, remoteSystem, NULL, 0);
	goto ret;

kickplayer:
	responseData = ID_INVALID_PASSWORD;
sendimmediateresponse:
	printf("disconnecting player\n");
	RakPeer__SendImmediate(
		this,
		&responseData,
		sizeof(char) * 8,
		SYSTEM_PRIORITY,
		RELIABLE,
		0,
		playerId,
		0,
		0,
		RakPeer__GetTime(),
		0
	);
	remoteSystem->connectMode = DISCONNECT_ASAP_SILENTLY;
ret:
	printf("ParseConnectionRequestPacket end\n");
}

int __declspec(naked) RakPeer__ParseConnectionRequestPacket(
	struct CRakPeer__RemoteSystemStruct *remoteSystem,
	struct PlayerID playerId,
	int data,
	char byteSize)
{
	_asm {
		mov eax, esp
		push [eax+0x14] // byteSize
		push [eax+0x10] // data
		push [eax+0xC] // playerId
		push [eax+0x8] // playerId
		push [eax+0x4] // remoteSystem
		push ecx // this
		call RakPeer__ParseConnectionRequestPacketInternal
		add esp, 0x18
		retn 0x14 /*+4 for playerid*/
	}
}