fix bugs in BasicFlow.java and FlowGenerator.java #170
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In BasicFlow.java:firstPacket, the variable flowLengthStats is added by payload of packet twice rather than once. The first time is after enter BasicFlow.java:firstPacket, and before checking whether it is forward packet or backward packet. The second time is after checking whether it is forward packet or backward packet. This commit remove the second redundant one.
In the first packet of a flow which is handled in BasicFlow.java:firstPacket, the flags PSH and URG are counted correctly. But in the second and after packets of a flow which is handled in BasicFlow.java:addPacket, the flags PSH and URG are not counted correctly. This commit counts PSH and URG flags correctly for the second and after packets.
In the first packet of a flow which is handled in BasicFlow.java:firstPacket, when calling function:updateFlowBulk, the BasicFlow.src is null, but the BasicFlow.src is used to compare with the source ip of the first packet. In function:updateFlowBulk, in order to compare with BasicFlow.src and the source ip of the first packet, the code use operator == rather than Arrays.equals. This commit fixes these 2 bugs.
When handling a closed flow which receives FIN flag, the code from FlowGenerator.java:addPacket check if the flow receive FIN flag on both direction, but the code incorrectly use function:getBwdFINFlags + function:getBwdFINFlags == 2 rather than function:getFwdFINFlags + function:getBwdFINFlags == 2. This commit fixes this bug.
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bug 1: BasicFlow.java
In BasicFlow.java:firstPacket, the variable flowLengthStats is added
by payload of packet twice rather than once.
The first time is after enter BasicFlow.java:firstPacket, and before
checking whether it is forward packet or backward packet.
The second time is after checking whether it is forward packet or
backward packet.
bug 2: BasicFlow.java
In the first packet of a flow which is handled in
BasicFlow.java:firstPacket, the flags PSH and URG are counted
correctly.
But in the second and after packets of a flow which is handled in
BasicFlow.java:addPacket, the flags PSH and URG are not counted
correctly.
but 3: BasicFlow.java
In the first packet of a flow which is handled in
BasicFlow.java:firstPacket, when calling function:updateFlowBulk, the
BasicFlow.src is null, but the BasicFlow.src is used to compare with
the source ip of the first packet.
In function:updateFlowBulk, in order to compare with BasicFlow.src
and the source ip of the first packet, the code use operator ==
rather than Arrays.equals.
bug 4: FlowGenerator.java
When handling a closed flow which receives FIN flag, the code from
FlowGenerator.java:addPacket check if the flow receive FIN flag on
both direction, but the code incorrectly use
function:getBwdFINFlags + function:getBwdFINFlags == 2
rather than
function:getFwdFINFlags + function:getBwdFINFlags == 2.