Opening an adapter and capturing the packets
Obtain a packet capture handle (Pcap) with a specific network interface (adapter) to look at packets on the network and process it with Pcap.loop(int, PacketHandler, T args).
Once the adapter is opened, the capture can be started with Pcap.dispatch(int, PacketHandler, T args) or Pcap.dispatch(int, PacketHandler, T args). These two functions are very similar, the difference is that Pcap.dispatch(int, PacketHandler, T args) returns (although not guaranteed) when the timeout expires while Pcap.loop(int, PacketHandler, T args) doesn't return until maximum packets have been captured, so it can block for an arbitrary period on an under-utilized network.
public static void main(String[] _args) throws ErrorException, PermissionDeniedException, PromiscuousModePermissionDeniedException, TimestampPrecisionNotSupportedException, RadioFrequencyModeNotSupportedException, NoSuchDeviceException, ActivatedException, InterfaceNotUpException, InterfaceNotSupportTimestampTypeException { var service = Service.Creator.create("PcapService"); try (var pcap = service.live(service.interfaces(), new DefaultLiveOptions())) { try { pcap.loop( 10, (args, header, buffer) -> { System.out.println("Args : " + args); System.out.println("Header : " + header); System.out.println("Packet : " + buffer); }, "Hello pcap!"); } catch (BreakException e) { System.err.println(e.getMessage()); } catch (ErrorException e) { System.err.println(e.getMessage()); } }}fun main() { val service = Service.Creator.create("PcapService") val pcap = service.live(service.interfaces(), DefaultLiveOptions()) try { pcap.loop( 10, { args: String, header: PacketHeader, buffer: PacketBuffer -> println("Args : $args") println("Header : $header") println("Packet : $buffer") }, "Hello pcap!" ) } catch (e: BreakException) { System.err.println(e.message) } catch (e: ErrorException) { System.err.println(e.message) } pcap.close()}def main(_args: Array[String]): Unit = { val service = Service.Creator.create("PcapService") val pcap = service.live(service.interfaces().next(), new DefaultLiveOptions()) try pcap.loop(10, (args: String, header: PacketHeader, buffer: PacketBuffer) => { println("Args : ", args) println("Header : ", header) println("Packet : ", buffer) }, "Hello pcap!") catch { case e: BreakException => System.err.println(e.getMessage) case e: ErrorException => System.err.println(e.getMessage) } pcap.close()}Last updated
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