anti ddos

//Anti DDoS Attack Filterscript by Jankingston. Feel free to modify ;)

#include <a_samp>
#include <FileFunctions>

#define ATTACK_TYPE_PLAYERID 1
#define ATTACK_TYPE_IP 2

new File:ServerLogFile;
new addostimer;

main()
{
    print("|----------------------------------|");
    print("| Anti DDOS filterscript v0.1      |");
    print("|----------------------------------|");
}

public OnFilterScriptInit()
{
    ServerLogFile = fileOpen("server_log.txt", io_Read);
    addostimer = SetTimer("Anti-DDoS", 100, true);
    return 1;
}

public OnFilterScriptExit()
{
    KillTimer(addostimer);
    return 1;
}

forward AntiDDoS();
public AntiDDoS()
{
    if(!ServerLogFile)
    {
        print("Error opening server_log.txt!");
        KillTimer(addostimer);
    }
    else
    {
        new string[128];
        new strarr[2][20];
        fileSeek(ServerLogFile, -128, seek_End);
        while(fileRead(ServerLogFile, string)){}

        new pos = strfind(string, "Invalid client connecting from ", true, 10);
        if(pos == 11)
        {
            OnDDosAttackAttempt(ATTACK_TYPE_IP, INVALID_PLAYER_ID, string[pos+31]);
        }

        pos = strfind(string, "Warning: /rcon command exploit from: ", true, 10);
        if(pos == 11){
            split(string[pos+37], strarr, ':');
            OnDDosAttackAttempt(ATTACK_TYPE_PLAYERID, strval(strarr[0]), strarr[1]);
        }

        pos = strfind(string, "Warning: PlayerDialogResponse PlayerId: ", true, 10);
        if(pos == 11){

            new idx = 0;
            new plid = strval(strtok(string[pos+39], idx));
            SetPVarInt(plid, "dialogDDosAtt", GetPVarInt(plid, "dialogDDosAtt")+1);
            print("");
            if(GetPVarInt(plid, "dialogDDosAtt") > 2)OnDDosAttackAttempt(ATTACK_TYPE_PLAYERID, plid, " ");
        }

        pos = strfind(string, "Warning: PlayerDialogResponse crash exploit from PlayerId: ", true, 10);
        if(pos == 11){
            new idx = 0;
            OnDDosAttackAttempt(ATTACK_TYPE_PLAYERID, strval(strtok(string[pos+59], idx)), " ");
        }

        pos = strfind(string, "Packet was modified, sent by id: ", true, 10);
        if(pos == 11){
            split(string[pos+33], strarr, ',');
            OnDDosAttackAttempt(ATTACK_TYPE_PLAYERID, strval(strarr[0]), " ");
        }

        pos = strfind(string, "Remote Port Refused for Player: ", true, 10);
        if(pos == 11){
            new idx = 0;
            OnDDosAttackAttempt(ATTACK_TYPE_PLAYERID, strval(strtok(string[pos+32], idx)), " ");
        }

        if(strfind(string, " due to a 'server full' attack") != -1)
        {
            pos = strfind(string, "Blocking ", true, 10);
            if(pos == 12)
            {
                new idx = 0;
                OnDDosAttackAttempt(ATTACK_TYPE_IP, INVALID_PLAYER_ID, strtok(string[pos+9], idx));
            }
        }
    }
}

forward OnDDosAttackAttempt(type, playerid, ip[]);
public OnDDosAttackAttempt(type, playerid, ip[])
{
    new string[128];
    if(type == ATTACK_TYPE_PLAYERID)
    {//block a playerid
        BanEx(playerid, "DDOS protect");
        printf("Blocked attack from playerid %d", playerid);

    }else if(type == ATTACK_TYPE_IP)
    {//block an ip address
        format(string, sizeof(string), "banip %s", ip);
        SendRconCommand(string);
        printf("Blocked attack from ip: %s", ip);
    }

}

stock strtok(const string[], &index)
{
    new length = strlen(string);
    while ((index < length) && (string[index] <= ' '))
    {
        index++;
    }

    new offset = index;
    new result[20];
    while ((index < length) && (string[index] > ' ') && ((index - offset) < (sizeof(result) - 1)))
    {
        result[index - offset] = string[index];
        index++;
    }
    result[index - offset] = EOS;
    return result;
}

stock split(const strsrc[], strdest[][], delimiter)
{
    new i, li;
    new aNum;
    new len;
    while(i <= strlen(strsrc)){
        if(strsrc[i]==delimiter || i==strlen(strsrc)){
            len = strmid(strdest[aNum], strsrc, li, i, 128);
            strdest[aNum][len] = 0;
            li = i+1;
            aNum++;
        }
        i++;
    }
    return 1;
}