SA-MP: Simple restriction of connection under the same IP address.

#define     MAX_CONNECTIONS     3

public OnIncomingConnection(playerid, ip_address[], port)
{
    new
        count = 1;

    for (new i = 0, j = GetPlayerPoolSize(); i <= j; i++)
    {
        if (IsPlayerConnected(i) && strcmp(GetPlayerIP(i), ip_address, false) == 0)
        {
            count ++;
        }
    }

    if (count > MAX_CONNECTIONS)
    {
        Kick(playerid);
    }
    return true;
}

stock GetPlayerIP(playerid)
{
    new
        str[39 + 1];

    GetPlayerIp(playerid, str, sizeof(str));
    return str;
}