All Packages  This Package  Class Hierarchy  Class Search  Index

java.lang.Object
   |
   +----edu.utah.janos.nodeos.DemultiplexKey

Summary

public class  DemultiplexKey
     extends java.lang.Object
{
          // Fields 2
     private Vector segments;
     private int totalLength;

          // Constructors 1
     public DemultiplexKey(Flow);

          // Methods 8
     int length();
     public void match(int, int, byte[], boolean[]);
     public void matchANEP(int, byte, boolean, short);
     public void matchIPv4(int, int, int, int);
     public void matchTCP(int, int, int);
     public void matchUDP(int, int, int);
     public final int matches(byte[], int, int);
     public String toString();

          // Inner Classes 3
     private abstract static class DemultiplexKey.KeySegment
     protected static class DemultiplexKey.ByteMask
     private static class DemultiplexKey.ANEPHeader
}

A key for matching incoming packets.

Cross Reference

Extended By:

ANEPDemultiplexKey, SimpleDemultiplexKey

   private Vector segments

The set of segments that make up this key. The are matched based on their ordering.

   private int totalLength

The approximate length of data that this key will match.

Constructors

· DemultiplexKey

Summary  |  Top

   public DemultiplexKey(Flow flow) 

   public void match(int offset, 
                     int length, 
                     byte[] sequence, 
                     boolean[] mask) 

Add a segment that matches the given sequence of bytes.

Parameter	Description
offset	The offset from the previous segment to start matching
length	The length of the bytes to match
sequence	The sequence of bytes to match
mask	If non-null, its a bit mask that indicates which bytes in `sequence' should be matched.

   public void matchIPv4(int offset, 
                         int source, 
                         int dest, 
                         int protocol) 

Add a segment to match an IPv4 header

   public void matchUDP(int offset, 
                        int srcPort, 
                        int destPort) 

Add a segment to match a UDP header, needs to be preceded by an IPv4 segment

   public void matchTCP(int offset, 
                        int srcPort, 
                        int destPort) 

Add a segment to match a TCP header, needs to be preceded by an IPv4 segment

   public void matchANEP(int offset, 
                         byte version, 
                         boolean allVersions, 
                         short protocolID) 

Add a segment that matches an ANEP header

Parameter	Description
offset	The offset from the previous segment
version	The ANEP version number to match
allVersions	Match any version of ANEP
protocolID	The protocolID to match

   int length() 

Get the approximate length of the bytes that the can matches on.

   public final int matches(byte[] payload, 
                            int payloadStart, 
                            int payloadLength) 

Test a packet to see if this key matches

Parameter	Description
payload	The packet data
payloadStart	The place to start matching in `payload'
payloadLength	The length of data in payload, including bytes up to payloadStart.

Returns:

0 if there was an error; The index of the end of the key.

   public String toString() 

Overrides:

toString in class Object

All Packages  This Package  Class Hierarchy  Class Search  Index