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Filtering the traffic
In order to cause only certain packets to be returned when reading packets, a filter can be set on a pcap handle.
Java
Kotlin
Scala
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())) {
pcap.setFilter("icmp", true);
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())
pcap.setFilter("icmp", true)
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(), new DefaultLiveOptions())
pcap.setFilter("icmp", true)
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()
}
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