You need deep packet inspection [0] of the traffic. You'll probably need in addition some signature and algorithm to distinguish between different type of conte

You need deep packet inspection [0] of the traffic. You'll probably need in addition some signature and algorithm to distinguish between different type of content, but this is probably doable for unencrypted content. http://en.wikipedia.org/wiki/Deep_packet_inspection http://en.wikipedia.org/wiki/Deep_packet_inspection