task 5 started.

week3_TinsaeGhilay/Task 2/README.md

@@ -22,4 +22,117 @@
 3. And finaly we run the client as such
     ```bash
     java -cp "out:lib/*" client.Client
-    ```
+    ```
+
+
+    ### inspecting packets using wireshark.
+    ***
+    #### Normal functions
+    ***
+
+    I installed wireshark-cli and run 
+    ```bash
+    sudo tshark -i lo -f "tcp port 8080" -z follow,tcp,ascii,0
+    ```
+    In Client program the interaction looked like this
+    ```
+    Enter an integer: 4
+    Enter an integer: 6
+    The sum is: 10
+    ```
+    And the output of wireshark was as follows
+
+    ```xml
+        POST /RPC2 HTTP/1.1
+        Content-Type: text/xml
+        User-Agent: Apache XML RPC 3.0 (Sun HTTP Transport)
+        Cache-Control: no-cache
+        Pragma: no-cache
+        Host: localhost:8080
+        Accept: */*
+        Connection: keep-alive
+        Content-Length: 195
+
+        <?xml version="1.0" encoding="UTF-8"?>
+        <methodCall>
+            <methodName>sample.sum</methodName>
+            <params>
+                <param>
+                    <value><i4>4</i4></value>
+                </param>
+                <param>
+                    <value><i4>6</i4></value>
+                </param>
+            </params>
+        </methodCall>
+
+    HTTP/1.1 200 OK
+    Server: Apache XML-RPC 1.0
+    Connection: close
+    Content-Type: text/xml
+    Content-Length: 129
+
+    <?xml version="1.0" encoding="UTF-8"?>
+    <methodResponse>
+        <params>
+            <param>
+                <value><i4>10</i4></value>
+            </param>
+        </params>
+    </methodResponse>
+    ```
+	I believe this is the expected result.
+
+    ***
+    #### Intentional error
+    I changed the messge call string to `sample.add` instead of the correct `sample.sum` and run the program. obviously it threw an exception. the http response from wireguard was as follows
+    ```xml
+    POST /RPC2 HTTP/1.1
+    Content-Type: text/xml
+    User-Agent: Apache XML RPC 3.0 (Sun HTTP Transport)
+    Cache-Control: no-cache
+    Pragma: no-cache
+    Host: localhost:8080
+    Accept: */*
+    Connection: keep-alive
+    Content-Length: 196
+
+    <?xml version="1.0" encoding="UTF-8"?>
+    <methodCall>
+        <methodName>sample.add</methodName>
+            <params>
+                <param>
+                    <value><i4>23</i4></value>
+                </param>
+                <param>
+                    <value><i4>4</i4></value>
+                </param>
+            </params>
+        </methodCall>
+
+    HTTP/1.1 200 OK
+    Server: Apache XML-RPC 1.0
+    Connection: close
+    Content-Type: text/xml
+    Content-Length: 265
+
+    <?xml version="1.0" encoding="UTF-8"?>
+    <methodResponse>
+        <fault>
+            <value>
+                <struct>
+                    <member>
+                        <name>faultCode</name>
+                        <value><i4>0</i4></value>
+                    </member>
+                    <member>
+                        <name>faultString</name>
+                        <value>No such handler: sample.add</value>
+                    </member>
+                </struct>
+            </value>
+        </fault>
+    </methodResponse>
+    ```
+    Again the expected results. I only tested it in one machine. so time will be done may be another time.
+