Filtering out packets based on their size

Among filtering out packets based on their content like in the previous example, another possible usage of the filter event in SmartInspect would be to cancel packets which exceed a certain maximum packet size. This can be useful to reduce bandwidth or to keep log files small. An example implementation looks like:

using Gurock.SmartInspect;

public class PacketSizeFilter
{
    private int fMaximum;

    public PacketSizeFilter(int maximum)
    {
        this.fMaximum = maximum;
    }

    public void Run(object sender, FilterEventArgs args)
    {
        if (args.Packet.Size > this.fMaximum)
        {
            args.Cancel = true;
        }
    }
}


public class Program
{
    static void Main(string[] args)
    {
        // …

        // Only allow packets with a maximum size of 1KB
        PacketSizeFilter filter = new PacketSizeFilter(1024);
        SiAuto.Si.Filter += new
            FilterEventHandler(filter.Run);

        // …
    }
}

The Run method of the PacketSizeFilter class is the actual event handler for the Filter event and filters out every packet which exceeds a certain, user-defined packet size limit. In this case, every packet which is bigger than 1024 bytes will be canceled.