\caption{Preflight checklist\label{tbl:preflight}}
\end{longtable}
-\subsection{Testing of SUT}
+\subsection{Testing of SUT} \label{sec:testingofsut}
The SUT is a series of services for other computer programs with no end-user
facing interface. Therefore the SUT will be tested solely by calling it's
services through various automated scripts. An automated test suite will be
, even when they are received
out of order and that missing segments are resend. The SUT should
exhibit the same behavior. If segments are received out of order it should
-either reassemble them when the missing packet has arrived or request them to
-be resend when the Missing segments should be re-requested (by ACK-ing
-the correct sequence number).
+either reassemble them when the missing segment has arrived or request them to
+be resend. Missing segments should be re-requested (by ACK-ing
+their sequence number).
-A single request consists of a number of packets that are sent
+A single request consists of a number of segments that are sent
to the \emph{echo-server} and back. The TCP specification states that such a
transaction requires the following messages.
When the \emph{SUT} has received the ACK containing the message it's passed
trough to the \emph{echo-server}. The \emph{echo-server} will proceed by ordering
the \emph{SUT} to respond by sending the exact same message. When this happens
-the \emph{SUT} has to construct the last packet in the transaction listed above.
+the \emph{SUT} has to construct the last segment in the transaction listed above.
\bigskip
& c & a & b & a & b & \xmark & \xmark & \doTCC & \doTCC\\
& c & b & a & c & a & \xmark & \xmark & \doTCC & \doTCC\\
& b & a & b & c & a & \xmark & \xmark & \xmark & \doTCC\\
- & b & b & a & b & b & \xmark & \xmark & \doTCC & \doTCC\\
+ & b & b & a & b & b & \xmark & \xmark & \xmark & \doTCC\\
& c & b & b & a & b & \xmark & \doTCC & \doTCC & \doTCC\\
- & b & b & b & a & b & \xmark & \doTCC & \doTCC & \doTCC\\
+ & b & b & b & a & b & \xmark & \xmark & \xmark & \doTCC\\
& a & b & b & b & a & \xmark & \xmark & \doTCC & \doTCC\\
\hline
\end{tabular}
carefully selected to cover the most interesting parts of the TCP specification
to ensure a complete but feasible test suite.
-To further increase the coverage of the test suites tests are randomized. The
-tests which test the handling of \emph{bit errors}, changes in the \emph{packet
-order} and \emph{dropped packets} randomize where they introduce an error. The
-test suite runs these tests multiple times to increase the likelihood that they
-discover a fault which is only present when an error occurs in a certain
-position.
+%To further increase the coverage of the test suites tests are randomized. The
+%tests which test the handling of \emph{bit errors}, changes in the \emph{segment
+%order} and \emph{dropped segments} randomize where they introduce an error. The
+%test suite runs these tests multiple times to increase the likelihood that they
+%discover a fault which is only present when an error occurs in a certain
+%position.
To further decrease the number of tests needed test cases are divided into
equivalence partitions and the combination of cases as described in
\hline
Test number & Expected results\\
\hline\hline
- \doTCC & An ACK\# of the sequence number of the SYN packet + 1. \\ \hline
\doTCC & An ACK\# of the send sequence number + 1.\\ \hline
\doTCC & An ACK\# of the sequence number of the last send segment + the
size of the payload of that segment.\\ \hline
size of the payload of that segment.\\ \hline
\doTCC & An ACK\# of the sequence number of the last send segment + the
size of the payload of that segment.\\ \hline
- \doTCC & An ACK\# of the sequence number of the swapped packet with the lowest sequence number. \\ \hline
\doTCC & The ACK\# for the SEQ\# of the first segments which is
corrupted is received for each consecutive segment send.\\
$\vdots$ & \\
- \setcounter{TCC}{10}
+ \setcounter{TCC}{12}
\doTCC & The ACK\# for the SEQ\# of the first segments which is
corrupted is received for each consecutive segment send.\\ \hline
- \doTCC & An ACK\# of the sequence number of the last send segment + the
- size of the payload of that segment.\\ \hline
-% \doTCC & The segment is not attributed to the current connection
-% and therefore no ACK\# is received. \\ \hline
-% \doTCC & The ACK\# for the SEQ\# of the first segments which is
-% corrupted is received for each consecutive segment send.\\ \hline
-% \doTCC & The ACK\# for the SEQ\# of the first segments which is
-% corrupted is received for each consecutive segment send.\\ \hline
-% \doTCC & The segment is not attributed to the current connection
-% and therefore no ACK\# is received. \\ \hline
-% \doTCC & The ACK\# for the SEQ\# of the first segments which is
-% corrupted is received for each consecutive segment send.\\ \hline
-% \doTCC & The ACK\# for the SEQ\# of the first segments which is
-% corrupted is received for each consecutive segment send.\\ \hline
-% \doTCC & The ACK\# for the SEQ\# of the first segments which is
-% corrupted is received for each consecutive segment send.\\ \hline
-% \doTCC & The ACK\# for the SEQ\# of the first segments which is
-% corrupted is received for each consecutive segment send.\\ \hline
+ \doTCC & The segment is not attributed to the current connection
+ and therefore no ACK\# is received. \\ \hline
+ \doTCC & The ACK\# for the SEQ\# of the first segments which is
+ corrupted is received for each consecutive segment send.\\ \hline
+ \doTCC & The ACK\# for the SEQ\# of the first segments which is
+ corrupted is received for each consecutive segment send.\\ \hline
+ \doTCC & The ACK\# for the SEQ\# of the first segments which is
+ corrupted is received for each consecutive segment send.\\ \hline
+ \doTCC & The ACK\# for the SEQ\# of the first segments which is
+ corrupted is received for each consecutive segment send.\\ \hline
+ \doTCC & The ACK\# for the SEQ\# of the first segments which is
+ corrupted is received for each consecutive segment send.\\ \hline
\end{tabular}
\caption{Expected results of test cases}
\label{tbl:testcases}
Nr & 6 \\\hline
Title & 5 requests with 65495byte payload with corrupted source port, destination port and checksum. The second segment is omitted in order to simulate a packet drop on the client side. \\\hline
- Input & Generated packets with 65495byte payload, second generated packet is removed. \\\hline
+ Input & Generated segments with 65495byte payload, second generated segment is removed. \\\hline
Expected output & All packets are dropped resulting in a connection time-out. \\\hline
\multirow{2}{*}{Course of action}
& 1. Use the steps listed above in order to start the SUT. \\
Nr & 11 \\\hline
Title & 5 requests with 65495byte corrupted payload that doesn't show up in checksum and corrupted destination port. The second packet is dropped. \\\hline
- Input & Generated packets with 65495byte payload, in these packets one 16bit word in the payload is increased by 1 and another 16bit word is decreased by 1. The destination port is also increase by one and the second packet is removed. \\\hline
+ Input & Generated packets with 65495byte payload, in these packets one 16bit word in the payload is increased by 1 and another 16bit word is decreased by 1. The destination port is also increase by one and the second segments is removed. \\\hline
Expected output & All packets are dropped resulting in a connection time-out. \\\hline
\multirow{2}{*}{Course of action}
& 1. Use the steps listed above in order to start the SUT. \\
Valid trace & Verify that the script prints 'Success'. \\\hline
\hline
-
-
- Nr & 6 \\\hline
- Title & 5 requests with 1byte payload with corrupted source port, destination port and checksum. The second segment is omitted in order to simulate a packet drop on the client side. \\\hline
- Input & Generated packets with 1byte payload, two packets are swapped in position. \\\hline
+
+ Nr & 12 \\\hline
+ Title & 5 requests with 65495byte corrupted payload that doesn't show up in checksum and corrupted source port and checksum. The 2nd and 3rd packets are swapped. \\\hline
+ Input & Generated packets with 65495byte payload, in these packets one 16bit word in the payload, the source port and checksum are increased by one. A different 16bit word in the payload is decreased by one. The 2nd and 3rd packets are swapped in order to simulate a out-of-order transmission. \\\hline
Expected output & All packets are dropped resulting in a connection time-out. \\\hline
\multirow{2}{*}{Course of action}
& 1. Use the steps listed above in order to start the SUT. \\
- & 2. Execute the script by running \texttt{\# code/client/tests/5.py} \\\hline
+ & 2. Execute the script by running \texttt{\# code/client/tests/12.py} \\\hline
Valid trace & Verify that the script prints 'Success'. \\\hline
\hline
+
- Nr & 7 \\\hline
- Title & Request with corrupted destination port. \\\hline
- Input & Generated packets with 1byte payload, in these packets the destination port number is increased by one. \\\hline
- Expected output & The packets will never reach the Echo-server resulting in a connection time-out. \\\hline
+ Nr & 13 \\\hline
+ Title & Single request with 1byte corrupted payload and corrupted source port, destination port and checksum. \\\hline
+ Input & Generated segment with 1byte payload, in this segment one byte in the payload, the source port and checksum are increased by one. \\\hline
+ Expected output & All packets are dropped resulting in a connection time-out. \\\hline
\multirow{2}{*}{Course of action}
& 1. Use the steps listed above in order to start the SUT. \\
- & 2. Execute the script by running \texttt{\# code/client/tests/7.py} \\\hline
+ & 2. Execute the script by running \texttt{\# code/client/tests/13.py} \\\hline
Valid trace & Verify that the script prints 'Success'. \\\hline
\hline
-
- Nr & 8 \\\hline
- Title & Request with corrupted source address. \\\hline
- Input & Generated packets with 1byte payload, in these packets the source address is replaced with 255.255.255.255. \\\hline
- Expected output & The Echo-server will receive packet and is unable to respond with a ACK resulting in a connection time-out. \\\hline
+
+ Nr & 14 \\\hline
+ Title & 5 requests with 1byte corrupted payload and corrupted source port, destination port and checksum. \\\hline
+ Input & Generated packets with 1byte payload, in these segment one byte in the payload, the source port and checksum are increased by one. \\\hline
+ Expected output & All packets are dropped resulting in a connection time-out. \\\hline
\multirow{2}{*}{Course of action}
& 1. Use the steps listed above in order to start the SUT. \\
- & 2. Execute the script by running \texttt{\# code/client/tests/8.py} \\\hline
+ & 2. Execute the script by running \texttt{\# code/client/tests/14.py} \\\hline
Valid trace & Verify that the script prints 'Success'. \\\hline
\hline
- Nr & 9 \\\hline
- Title & Request with corrupted destination address. \\\hline
- Input & Generated packets with 1byte payload, in these packets the destination address is replaced with 255.255.255.255. \\\hline
- Expected output & The packets will never reach the Echo-server resulting in a connection time-out. \\\hline
+ Nr & 15 \\\hline
+ Title & 5 requests with 65495byte corrupted payload and corrupted source port, destination port and checksum. \\\hline
+ Input & Generated packets with 65495byte payload, in these packets one byte in the payload, the source port and checksum are increased by one. \\\hline
+ Expected output & All packets are dropped resulting in a connection time-out. \\\hline
\multirow{2}{*}{Course of action}
& 1. Use the steps listed above in order to start the SUT. \\
- & 2. Execute the script by running \texttt{\# code/client/tests/9.py} \\\hline
+ & 2. Execute the script by running \texttt{\# code/client/tests/15.py} \\\hline
Valid trace & Verify that the script prints 'Success'. \\\hline
\hline
-
- Nr & 10 \\\hline
- Title & Request with corrupted payload detectable by checksum. \\\hline
- Input & Generated packets with 1byte payload, in these packets one byte is increased by 1 after the checksum has been calculated. \\\hline
- Expected output & The \emph{SUT} will drop packets before sending them resulting in a runtime error of the test script. \\\hline
+
+ Nr & 16 \\\hline
+ Title & 5 requests with 65495byte corrupted payload that doesn't show up in the checksum, corrupted source port, destination port and checksum. \\\hline
+ Input & Generated packets with 65495byte payload, in these packets one 16bit word in the payload, the source port and checksum are increased by one. Another 16bit word in the payload is decreased by 1. \\\hline
+ Expected output & All packets are dropped resulting in a connection time-out. \\\hline
\multirow{2}{*}{Course of action}
& 1. Use the steps listed above in order to start the SUT. \\
- & 2. Execute the script by running \texttt{\# code/client/tests/10.py} \\\hline
+ & 2. Execute the script by running \texttt{\# code/client/tests/16.py} \\\hline
Valid trace & Verify that the script prints 'Success'. \\\hline
\hline
- Nr & 11 \\\hline
- Title & Request with corrupted payload undetectable by checksum. \\\hline
- Input & Generated packets with 1byte payload, in these packets one 16bit word is increased by 1 and an other 16bit word is decreased by 1, after the checksum has been calculated. \\\hline
- Expected output & Echo-server receives the corrupted segment. \\\hline
+
+ Nr & 17 \\\hline
+ Title & 5 requests with 1byte payload, corrupted destination port and checksum. The 2nd and 3rd packets are swapped \\\hline
+ Input & Generated packets with 1byte payload, in these packets the destination port and checksum are increased by one. The 2nd and 3rd packets are swapped in order to simulate an out-of-order transmission. \\\hline
+ Expected output & All packets are dropped resulting in a connection time-out. \\\hline
\multirow{2}{*}{Course of action}
& 1. Use the steps listed above in order to start the SUT. \\
- & 2. Execute the script by running \texttt{\# code/client/tests/11.py} \\\hline
+ & 2. Execute the script by running \texttt{\# code/client/tests/17.py} \\\hline
Valid trace & Verify that the script prints 'Success'. \\\hline
-
+ \hline
+
+
+ Nr & 18 \\\hline
+ Title & 5 requests with 65495byte payload, corrupted destination port and checksum. The 2nd and 3rd packets are swapped \\\hline
+ Input & Generated packets with 65495byte payload, in these packets the destination port and checksum are increased by one. The 2nd and 3rd packets are swapped in order to simulate an out-of-order transmission. \\\hline
+ Expected output & All packets are dropped resulting in a connection time-out. \\\hline
+ \multirow{2}{*}{Course of action}
+ & 1. Use the steps listed above in order to start the SUT. \\
+ & 2. Execute the script by running \texttt{\# code/client/tests/18.py} \\\hline
+ Valid trace & Verify that the script prints 'Success'. \\\hline
+ \hline
\end{longtable}
%\begin{tabularx}{\linewidth}{| l | X|}
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