Python代写｜CSc 361 Assignment 2 TCP Traffic Analysis

1 Goal

The purpose of this project is to understand the details of state management in Transmission
Control Protocol (TCP). You are required to write a python program to analyze the TCP protocol
behavior.

2 Requirements

You will be given a sample TCP trace file (sample-capture-file.cap). During the period traced, a
single web client accesses different web sites on the Internet. This trace is to be used for your own
test. TA might use a different trace file to test your code.

You need to write a python program for parsing and processing the trace file, and tracking TCP
state information. In this assignment, your code will be tested on the server linux.csc.uvic.ca. As
such, you are allowed to use only the Python packages of python3 currently installed on
linux.csc.uvic.ca. You are not allowed to install/use other third-party python packages.

Your program should process the trace file and compute summary information about TCP
connections. Note that a TCP connection is identified by a 4-tuple (IP source address, source port,
IP destination address, destination port), and packets can flow in both directions on a connection
(i.e., duplex). Also note that the packets from different connections can be arbitrarily interleaved
with each other in time, so your program will need to extract packets and associate them with the
correct connection.

The summary information to be computed for each TCP connection includes:

the state of the connection. Possible states are: S0F0 (no SYN and no FIN), S1F0 (one SYN
and no FIN), S2F0 (two SYN and no FIN), S1F1 (one SYN and one FIN), S2F1 (two SYN
and one FIN), S2F2 (two SYN and two FIN), S0F1 (no SYN and one FIN), S0F2 (no SYN and
two FIN), and so on, as well as R (connection reset due to protocol error). For consistence,
we count a SYN+ACK segment (i.e., a segment with both SYN bit and ACK bit set to 1)
as a SYN message. (Of course, a SYN segment is also counted as a SYN segment). Getting
this state information correct is the most important part of your program. We are especially
interested in the complete TCP connections for which we see at least one SYN and at least
one FIN. For these complete connections, you can report additional information, as indicated
in the following.

the starting time, ending time, and duration of each complete connection

the number of packets sent in each direction on each complete connection, as well as the total
packets

the number of data bytes sent in each direction on each complete connection, as well as
the total bytes. This byte count is for data bytes (i.e., excluding the TCP and IP protocol
headers).

Besides the above information for each TCP connection, your program needs to provide the
following statistical results for the whole trace data:

the number of reset TCP connections observed in the trace

the number of TCP connections that were still open when the trace capture ended

the number of complete TCP connections observed in the trace

Regarding the complete TCP connections you observed:

– the minimum, mean, and maximum time durations of the complete TCP connections
– the minimum, mean, and maximum RTT (Round Trip Time) values of the complete
TCP connections
– the minimum, mean, and maximum number of packets (both directions) sent on the
complete TCP connections
– the minimum, mean, and maximum receive window sizes (both sides) of the complete
TCP connections.

As a guideline for output format, please follow the output format of this project shown in
outputformat.pdf.

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