toribio

#include "amx.h"
#include "plugincommon.h"
#include <windows.h>

typedef void (*logprintf_t)(char* format, ...);

logprintf_t logprintf;
void **ppPluginData;
extern void *pAMXFunctions;
AMX *gMachines[51];

PLUGIN_EXPORT unsigned int PLUGIN_CALL Supports()
{
    return SUPPORTS_VERSION | SUPPORTS_AMX_NATIVES;
}

void Call(DWORD from, DWORD to)
{
    DWORD oldp, newp, disp;
    disp = to - (from + 5);
    VirtualProtect((LPVOID)from, 5, PAGE_EXECUTE_READWRITE, &oldp);
    *(PBYTE)(from) = 0xE8;
    *(PDWORD)(from + 1) = (DWORD)disp;
    VirtualProtect((LPVOID)from, 5, oldp, &newp);
}

void OnModifiedPacket(char *string, int playerid, char *ip)
{
    cell retval;
    for(short i = 0; i < sizeof gMachines; ++i)
    {
        if(gMachines[i])
        {
            int index;
            if(amx_FindPublic(gMachines[i], "OnModifiedPacket", &index) == AMX_ERR_NONE)
            {
                amx_Push(gMachines[i], (cell)playerid);
                amx_Exec(gMachines[i], &retval, index);
            }
        }
    }
    if(retval)
    {
        logprintf(string, playerid, ip);
    }
}

PLUGIN_EXPORT bool PLUGIN_CALL Load(void **ppData)
{
    pAMXFunctions = ppData[PLUGIN_DATA_AMX_EXPORTS];
    logprintf = (logprintf_t)ppData[PLUGIN_DATA_LOGPRINTF];
    Call(0x0049B801, (DWORD)OnModifiedPacket);
    logprintf("Anti-packet-modifier by Flavio Toribio loaded.");
    return true;
}

PLUGIN_EXPORT void PLUGIN_CALL Unload()
{
    logprintf("Anti-packet-modifier by Flavio Toribio unloaded.");
}

PLUGIN_EXPORT int PLUGIN_CALL AmxLoad(AMX *amx)
{
    for(short i = 0; i < sizeof gMachines; ++i)
    {
        if(!gMachines[i])
        {
            gMachines[i] = amx;
            break;
        }
    }
    return AMX_ERR_NONE;
}

PLUGIN_EXPORT int PLUGIN_CALL AmxUnload(AMX *amx)
{
    for(short i = 0; i < sizeof gMachines; ++i)
    {
        if(gMachines[i] == amx)
        {
            gMachines[i] = NULL;
            break;
        }
    }
    return AMX_ERR_NONE;
}