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>Interactive Tests</TITLE
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TITLE="Tests and Demonstrations"
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TITLE="Performance Test"
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>eCos Reference Manual</TH
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><A
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>Prev</A
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><TD
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ALIGN="center"
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>Chapter 36. Tests and Demonstrations</TD
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><DIV
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><H1
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><A
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NAME="NET-COMMON-INTERACTIVE-TESTS">Interactive Tests</H1
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><TABLE
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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><SPAN
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><I
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>server_test</I
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></SPAN
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> - a very simple server example</PRE
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></TD
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></TR
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></TABLE
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><P
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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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and prints it. </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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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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>% telnet 172.16.19.171 7734
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Hello target board</PRE
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><P
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>and the test program will print something like:</P
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>connection from 172.16.19.13:3369
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buf = "Hello target board"</PRE
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><SPAN
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><I
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>ga_server_test</I
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></SPAN
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> - another very simple server example</PRE
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><P
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>This is a variation on the <SPAN
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>ga_server_test</I
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> test
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with the difference being that it uses the <TT
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>getaddrinfo</TT
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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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listen on port 7734 for a TCP connection via either IPv4 or IPv6.</P
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>tftp_client_test</I
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> - performs a tftp get and put from/to &#8220;server&#8221;</PRE
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><P
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>This is only partially interactive.  You need to set things
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up on the &#8220;server&#8221; 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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was well.</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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tftp from the server, a file called
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<TT
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CLASS="FILENAME"
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>tftp_get</TT
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>
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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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the same data to a file called
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<TT
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>tftp_put</TT
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>
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on
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the same server.</P
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><P
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>In order for this to succeed, both files must already exist.
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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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will only allow writes to an existing file, given the appropriate
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permission.  Thus, you need to have these files in place, with proper permission,
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before running the test.</P
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><P
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>The conventional place for the tftp server to operate in LINUX
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is /tftpboot/; you will likely need root privileges
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to create files there. The data contents of
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<TT
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CLASS="FILENAME"
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>tftp_get</TT
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>
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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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time printing it on the test&#8217;s stdout, and anything above
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32kB will cause a buffer overflow and unpredictable failure.</P
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><P
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>Creating an empty tftp_put file (eg. by copying /dev/null
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to it) is neatest.  So before the test you should have something
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like:</P
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>-rw-rw-rw- 1 root        1076 May  1 11:39 tftp_get
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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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><P
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>note that both files have public permissions wide open.  After
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running the test,
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<TT
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CLASS="FILENAME"
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>tftp_put</TT
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>
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should
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be a copy of
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<TT
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CLASS="FILENAME"
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>tftp_get</TT
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>.</P
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><PRE
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>-rw-rw-rw-  1 root       1076 May  1 11:39 tftp_get
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-rw-rw-rw-  1 root       1076 May  1 15:52 tftp_put&#13;</PRE
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></TD
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><TR
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><TD
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><PRE
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CLASS="PROGRAMLISTING"
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><SPAN
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CLASS="emphasis"
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><I
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CLASS="EMPHASIS"
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>tftp_server_test</I
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></SPAN
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> - runs a tftp server for a short while</PRE
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></TD
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></TR
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></TABLE
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><P
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>This test is truly interactive, in that you can use a standard
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tftp application to get and put files from the server, during the
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5 minutes that it runs.  The dummy filesystem which underlies the
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server initially contains one file, called &#8220;uu&#8221; which contains
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part of a familiar text and some padding.  It also accommodates
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creation of 3 further files of up to 1Mb in size and names of up
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to 256 bytes.  Exceeding these limits will cause a buffer overflow
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and unpredictable failure.</P
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><P
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>The dummy filesystem is an implementation of the generic API
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which allows a true filesystem to be attached to the tftp server
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in the network stack.</P
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><P
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>We have been testing the tftp server by running the test on
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the target board, then using two different host computers connecting
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to the different target interfaces, putting a file from each, getting
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the &#8220;uu&#8221; file, and getting the file from the other computer.
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 This verifies that data is preserved during the transfer as well
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as interworking with standard tftp applications.</P
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>Performance Test</TD
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