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>Chapter 36. Tests and Demonstrations</TD
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>Chapter 36. Tests and Demonstrations</TD
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><A
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><A
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NAME="NET-COMMON-INTERACTIVE-TESTS">Interactive Tests</H1
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NAME="NET-COMMON-INTERACTIVE-TESTS">Interactive Tests</H1
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><TABLE
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><TR
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><TD
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><PRE
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><PRE
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CLASS="PROGRAMLISTING"
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CLASS="PROGRAMLISTING"
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><SPAN
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><SPAN
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CLASS="emphasis"
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CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
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>server_test</I
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>server_test</I
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></SPAN
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></SPAN
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> - a very simple server example</PRE
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> - a very simple server example</PRE
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></TD
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></TD
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><P
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><P
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>This test simply awaits a connection on port 7734 and after
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>This test simply awaits a connection on port 7734 and after
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accepting a connection, gets a packet (with a timeout of a few seconds)
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accepting a connection, gets a packet (with a timeout of a few seconds)
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and prints it. </P
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and prints it. </P
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><P
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><P
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>The connection is then closed. We then loop to await the next
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>The connection is then closed. We then loop to await the next
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connection, and so on. To use it, telnet to the target on port 7734
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connection, and so on. To use it, telnet to the target on port 7734
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then type something (quickly!)</P
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then type something (quickly!)</P
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><TD
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><PRE
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><PRE
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CLASS="SCREEN"
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CLASS="SCREEN"
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>% telnet 172.16.19.171 7734
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>% telnet 172.16.19.171 7734
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Hello target board</PRE
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Hello target board</PRE
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></TD
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></TD
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><P
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><P
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>and the test program will print something like:</P
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>and the test program will print something like:</P
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><TABLE
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><TD
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><PRE
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><PRE
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CLASS="SCREEN"
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CLASS="SCREEN"
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>connection from 172.16.19.13:3369
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>connection from 172.16.19.13:3369
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buf = "Hello target board"</PRE
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buf = "Hello target board"</PRE
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></TD
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></TD
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></TR
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></TR
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></TABLE
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><TABLE
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><TR
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><TD
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><PRE
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><PRE
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CLASS="PROGRAMLISTING"
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CLASS="PROGRAMLISTING"
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><SPAN
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><SPAN
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CLASS="emphasis"
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CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
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>ga_server_test</I
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>ga_server_test</I
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></SPAN
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></SPAN
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> - another very simple server example</PRE
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> - another very simple server example</PRE
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></TD
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></TD
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></TR
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></TR
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></TABLE
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></TABLE
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><P
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><P
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>This is a variation on the <SPAN
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>This is a variation on the <SPAN
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CLASS="emphasis"
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CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
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>ga_server_test</I
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>ga_server_test</I
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></SPAN
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></SPAN
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> test
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> test
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with the difference being that it uses the <TT
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with the difference being that it uses the <TT
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CLASS="FUNCTION"
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CLASS="FUNCTION"
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>getaddrinfo</TT
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>getaddrinfo</TT
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>
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>
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function to set up its addresses. On a system with IPv6 enabled, it will
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function to set up its addresses. On a system with IPv6 enabled, it will
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listen on port 7734 for a TCP connection via either IPv4 or IPv6.</P
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listen on port 7734 for a TCP connection via either IPv4 or IPv6.</P
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><TABLE
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><TABLE
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><TR
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><TR
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><TD
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><TD
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><PRE
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><PRE
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CLASS="PROGRAMLISTING"
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CLASS="PROGRAMLISTING"
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><SPAN
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><SPAN
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CLASS="emphasis"
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CLASS="emphasis"
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><I
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><I
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CLASS="EMPHASIS"
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CLASS="EMPHASIS"
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>tftp_client_test</I
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>tftp_client_test</I
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></SPAN
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></SPAN
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> - performs a tftp get and put from/to “server”</PRE
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> - performs a tftp get and put from/to “server”</PRE
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></TD
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></TD
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></TR
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></TR
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></TABLE
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></TABLE
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><P
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><P
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>This is only partially interactive. You need to set things
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>This is only partially interactive. You need to set things
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up on the “server” in order for this to work,
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up on the “server” in order for this to work,
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and you will need to look at the server afterwards to confirm that all
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and you will need to look at the server afterwards to confirm that all
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was well.</P
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was well.</P
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><P
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><P
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>For each interface in turn, this test attempts to read by
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>For each interface in turn, this test attempts to read by
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tftp from the server, a file called
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tftp from the server, a file called
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<TT
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<TT
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CLASS="FILENAME"
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CLASS="FILENAME"
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>tftp_get</TT
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>tftp_get</TT
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>
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>
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and
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and
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prints the status and contents it read (if any). It then writes
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prints the status and contents it read (if any). It then writes
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the same data to a file called
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the same data to a file called
|
<TT
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<TT
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CLASS="FILENAME"
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CLASS="FILENAME"
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>tftp_put</TT
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>tftp_put</TT
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>
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>
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on
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on
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the same server.</P
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the same server.</P
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><P
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><P
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>In order for this to succeed, both files must already exist.
|
>In order for this to succeed, both files must already exist.
|
The TFTP protocol does not require that a WRQ request _create_ a
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The TFTP protocol does not require that a WRQ request _create_ a
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file, just that it can write it. The TFTP server on Linux certainly
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file, just that it can write it. The TFTP server on Linux certainly
|
will only allow writes to an existing file, given the appropriate
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will only allow writes to an existing file, given the appropriate
|
permission. Thus, you need to have these files in place, with proper permission,
|
permission. Thus, you need to have these files in place, with proper permission,
|
before running the test.</P
|
before running the test.</P
|
><P
|
><P
|
>The conventional place for the tftp server to operate in LINUX
|
>The conventional place for the tftp server to operate in LINUX
|
is /tftpboot/; you will likely need root privileges
|
is /tftpboot/; you will likely need root privileges
|
to create files there. The data contents of
|
to create files there. The data contents of
|
<TT
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<TT
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CLASS="FILENAME"
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CLASS="FILENAME"
|
>tftp_get</TT
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>tftp_get</TT
|
>
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>
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can
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can
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be anything you like, but anything very large will waste lots of
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be anything you like, but anything very large will waste lots of
|
time printing it on the test’s stdout, and anything above
|
time printing it on the test’s stdout, and anything above
|
32kB will cause a buffer overflow and unpredictable failure.</P
|
32kB will cause a buffer overflow and unpredictable failure.</P
|
><P
|
><P
|
>Creating an empty tftp_put file (eg. by copying /dev/null
|
>Creating an empty tftp_put file (eg. by copying /dev/null
|
to it) is neatest. So before the test you should have something
|
to it) is neatest. So before the test you should have something
|
like:</P
|
like:</P
|
><TABLE
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><TABLE
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WIDTH="70%"
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><TR
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><TD
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><TD
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><PRE
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><PRE
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CLASS="PROGRAMLISTING"
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CLASS="PROGRAMLISTING"
|
>-rw-rw-rw- 1 root 1076 May 1 11:39 tftp_get
|
>-rw-rw-rw- 1 root 1076 May 1 11:39 tftp_get
|
-rw-rw-rw- 1 root 0 May 1 15:52 tftp_put </PRE
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-rw-rw-rw- 1 root 0 May 1 15:52 tftp_put </PRE
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></TD
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></TD
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></TR
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></TR
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></TABLE
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></TABLE
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><P
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><P
|
>note that both files have public permissions wide open. After
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>note that both files have public permissions wide open. After
|
running the test,
|
running the test,
|
<TT
|
<TT
|
CLASS="FILENAME"
|
CLASS="FILENAME"
|
>tftp_put</TT
|
>tftp_put</TT
|
>
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>
|
should
|
should
|
be a copy of
|
be a copy of
|
<TT
|
<TT
|
CLASS="FILENAME"
|
CLASS="FILENAME"
|
>tftp_get</TT
|
>tftp_get</TT
|
>.</P
|
>.</P
|
><TABLE
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><TABLE
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><TR
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><TD
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><TD
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><PRE
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><PRE
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CLASS="PROGRAMLISTING"
|
CLASS="PROGRAMLISTING"
|
>-rw-rw-rw- 1 root 1076 May 1 11:39 tftp_get
|
>-rw-rw-rw- 1 root 1076 May 1 11:39 tftp_get
|
-rw-rw-rw- 1 root 1076 May 1 15:52 tftp_put </PRE
|
-rw-rw-rw- 1 root 1076 May 1 15:52 tftp_put </PRE
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></TD
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></TD
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><TD
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><PRE
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><PRE
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CLASS="PROGRAMLISTING"
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CLASS="PROGRAMLISTING"
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><SPAN
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><SPAN
|
CLASS="emphasis"
|
CLASS="emphasis"
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><I
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><I
|
CLASS="EMPHASIS"
|
CLASS="EMPHASIS"
|
>tftp_server_test</I
|
>tftp_server_test</I
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></SPAN
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></SPAN
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> - runs a tftp server for a short while</PRE
|
> - runs a tftp server for a short while</PRE
|
></TD
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></TD
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></TR
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></TR
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></TABLE
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></TABLE
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><P
|
><P
|
>This test is truly interactive, in that you can use a standard
|
>This test is truly interactive, in that you can use a standard
|
tftp application to get and put files from the server, during the
|
tftp application to get and put files from the server, during the
|
5 minutes that it runs. The dummy filesystem which underlies the
|
5 minutes that it runs. The dummy filesystem which underlies the
|
server initially contains one file, called “uu” which contains
|
server initially contains one file, called “uu” which contains
|
part of a familiar text and some padding. It also accommodates
|
part of a familiar text and some padding. It also accommodates
|
creation of 3 further files of up to 1Mb in size and names of up
|
creation of 3 further files of up to 1Mb in size and names of up
|
to 256 bytes. Exceeding these limits will cause a buffer overflow
|
to 256 bytes. Exceeding these limits will cause a buffer overflow
|
and unpredictable failure.</P
|
and unpredictable failure.</P
|
><P
|
><P
|
>The dummy filesystem is an implementation of the generic API
|
>The dummy filesystem is an implementation of the generic API
|
which allows a true filesystem to be attached to the tftp server
|
which allows a true filesystem to be attached to the tftp server
|
in the network stack.</P
|
in the network stack.</P
|
><P
|
><P
|
>We have been testing the tftp server by running the test on
|
>We have been testing the tftp server by running the test on
|
the target board, then using two different host computers connecting
|
the target board, then using two different host computers connecting
|
to the different target interfaces, putting a file from each, getting
|
to the different target interfaces, putting a file from each, getting
|
the “uu” file, and getting the file from the other computer.
|
the “uu” file, and getting the file from the other computer.
|
This verifies that data is preserved during the transfer as well
|
This verifies that data is preserved during the transfer as well
|
as interworking with standard tftp applications.</P
|
as interworking with standard tftp applications.</P
|
></DIV
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></BODY
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