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Simple example of how to use pkts.io to load a pcap file and print the content of all UDP packets.
import io.pkts.PacketHandler;
import io.pkts.Pcap;
import io.pkts.packet.Packet;
import io.pkts.protocol.Protocol;
import java.io.IOException;
// Step 1 - obtain a new Pcap instance by supplying an InputStream that points
// to a source that contains your captured traffic. Typically you may
// have stored that traffic in a file so there are a few convenience
// methods for those cases, such as just supplying the name of the
// file as shown below.
final Pcap pcap = Pcap.openStream("my_traffic.pcap");
// Step 2 - Once you have obtained an instance, you want to start
// looping over the content of the pcap. Do this by calling
// the loop function and supply a PacketHandler, which is a
// simple interface with only a single method - nextPacket
pcap.loop(new PacketHandler() {
@Override
public void nextPacket(final Packet packet) throws IOException {
// Step 3 - For every new packet the PacketHandler will be
// called and you can examine this packet in a few
// different ways. You can e.g. check whether the
// packet contains a particular protocol, such as UDP.
if (packet.hasProtocol(Protocol.UDP)) {
// Step 4 - Now that we know that the packet contains
// a UDP packet we get ask to get the UDP packet
// and once we have it we can just get its
// payload and print it, which is what we are
// doing below.
System.out.println(packet.getPacket(Protocol.UDP).getPayload());
}
}
});
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