Module org.jnetpcap

Package org.jnetpcap

Class BpFilter

java.lang.Object

org.jnetpcap.BpFilter

All Implemented Interfaces:

AutoCloseable

public final class BpFilter
extends Object
implements AutoCloseable

A Berkley Packet Filter program. BpFilter is applied to captured packets and only the packets that match the filter program are reported.

Each 64-bit instruction is the long int representation of the following bpf structure found in C header file "pcap/bpf.h":

 struct bpf_insn {
                u_short full;
                u_char  jt;
                u_char  jf;
                bpf_u_int32 k;
 };
 

Author:

Sly Technologies, repos@slytechs.com

Method Summary

Modifier and Type	Method	Description
void	close()	Close and deallocate native BPF program.
static void	freeCode(BpFilter bpFilter)	Deallocates a native BPF program.
int	length()	number of 64-bit long instructions.
String	toString()

Methods inherited from class java.lang.Object

equals, getClass, hashCode, notify, notifyAll, wait, wait, wait

Method Details

close

public void close()
           throws IllegalStateException

Close and deallocate native BPF program.

Specified by:

close in interface AutoCloseable

Throws:

IllegalStateException - thrown if already closed

See Also:

• AutoCloseable.close()

length

public int length()

number of 64-bit long instructions.

Returns:

number count of instructions

toString

public String toString()

Overrides:

toString in class Object

See Also:

• Object.toString()

freeCode

public static void freeCode(BpFilter bpFilter)

Deallocates a native BPF program.

Parameters:

bpFilter - the bpf

Since:

libpcap 0.6

See Also:

• Pcap.compile(String, boolean, int)
• pcap_freecode