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Lab #94 for CST8165 due April 14, 2008 (Week 14)
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-Ian! D. Allen - idallen@idallen.ca

Remember - knowing how to find out an answer is more important than
memorizing the answer.  Learn to fish!  RTFM!  (Read The Fine Manual)

Global weight: 1% of your total mark this term.  (BONUS)
Due at the end of your lab period today (Monday).

The deliverables for this lab exercise are to be submitted online on
the Course Linux Server using the "netsubmit" method described in the
lab exercise description, below.  No paper; no email; no FTP.

Synopsis:
    Send email using SMTP (MTA) via netcat.
    Fetch email using POP3 (MRA/MAA) via netcat.

Where to work: connections to the Course Linux Server at 10.50.254.148

Where script sessions are requested, the script sessions must not contain
any other commands other than those needed to answer the question.
You may need to practice getting the right answer before you run a
script session to record it.  You can edit the script session afterward
to delete minor mistakes in command use.

Using netcat to send and receive email
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Class Notes: smtp_session.txt and your Week 13 notes

Internet protocols are text-based.  You can debug them using a simple
text client in a terminal window.  Network administrators should know
enough SMTP and POP to send and receive a single test email message.

1.  Use a model SMTP session (smtp_session.txt) with netcat (not telnet)
    to send an email message via SMTP to your Course Linux Server [CLS]
    login userid (same as your Algonquin userid) via 10.50.254.148 :

    Notes:
     - the domain name after "HELO" doesn't matter (make one up)
     - the colon ':' and <> around all email addresses must be present
     - the SMTP envelope MAIL FROM address doesn't matter (use yours)
     - the SMTP envelope RCPT TO address should be:  abcd0001@localhost
       where "abcd0001" is replaced by your real CLS login userid
     - the message body headers and text don't matter (anything will do)
     - SMTP commands may be entered in lower-case, if you prefer
     - if things are working, you will get a "250" response after each line

    Your session will look something like the session below, though you
    have to use the correct SMTP command lines in the correct order:

    $ nc -v 10.50.254.148 25
    alinux [10.50.254.148] 25 (smtp) open
    220 idallen-alinux.algonquincollege.com ESMTP Postfix (Ubuntu)
    ... say hello to the SMTP server ...
    250 idallen-alinux.algonquincollege.com
    ... give the mail from address (anything) ...
    250 2.1.0 Ok
    ... give the mail recipient address at localhost ...
    250 2.1.5 Ok
    ... indicate you're about to send the message body ...
    354 End data with <CR><LF>.<CR><LF>
    ... type in a mail message body ...
    250 2.0.0 Ok: queued as 8262A1AB2D4
    ... exit the SMTP session ...
    221 2.0.0 Bye

    If you store your SMTP commands in a text file, you can use shell input
    redirection to pass the entire text file into the SMTP port via netcat:

    $ nc -v 10.50.254.148 25 <smtpsession.txt

2.  Use a model POP3 session (Week 13) with netcat (not telnet) 
    to login, retrieve, and delete your local email:

    Notes:
     - you have to have at least one message waiting in your mailbox
     - you have to use ssh to login to the Course Linux Server and then
       use netcat to connect to "localhost"
     - yes, your password is typed in cleartext for POPmail
     - once logged in, you can use the "list" command to list waiting messages
     - you can use the "top" command to see just the headers of any message

    Your session will look something like the session below, though you
    have to use the correct POP3 command lines in the correct order:

    $ ssh abcd0001@10.50.254.148   # user your own userid in place of abcd0001
    $ nc -v localhost pop3
    localhost [127.0.0.1] 110 (pop3) open
    +OK Dovecot ready.
    ... give your CLS login account name ...
    +OK
    ... enter your CLS account password in clear text ...
    +OK Logged in.
    ... ask for a list of messages ...
    +OK 1 messages:
    1 509
    .
    ... ask to show the headers of the first message ...
    +OK
    ... first message headers print here ...
    ... ask to retrieve the first message ...
    +OK 509 octets
    ... first message header and body prints here ...
    ... ask to delete the first message ...
    +OK Marked to be deleted.
    ... ask to exit the POP3 session ...
    +OK Logging out, messages deleted.

Below are the only questions and answers that you must submit for marking.
Cut these questions below out of the lab into a new lab94answers.txt file.
Remove everything except the questions below from the answer file.

Place the answer to each question underneath the question, in the
answer file.  Use blank lines to separate all the questions and answers.
You do not need to fold lines that are longer than 80 columns if they
come from command output.  Long command output lines are allowed.

Do not use mouse cut-and-paste for any output.  Lines wrapped or damaged
by cut-and-paste are worth zero.  Use proper file copy operations and
editor technique.

Where script sessions are requested, the script sessions must not contain
any other commands other than those needed to answer the question.
You may need to practice getting the right answer before you run a
script session to record it.  You can edit the script session afterward
to delete minor mistakes in command use.

3.  Read the Notes file screendumps.txt.  Use the "ianscript" program to
    capture the entire SMTP netcat session from #1 into a script
    session output file.  Copy that script session output file here.
    (Do not use mouse cut-and-paste.)

4.  Use the "ianscript" program to capture the entire POP3 netcat session
    from #2 into a script session output file.  Copy that script session
    output file here.  (Do not use mouse cut-and-paste.)  Edit and
    replace your password with XXXXX here and in the script file.
    Don't submit or keep a file with your password in it.

Submission
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Submit using the exact file name given below.

Submission Standards (see earlier labs for details):

A.  At the top of each and every submitted file, as comments, create an
    Exterior Assignment Submission label.

B.  Submit your file for marking as Exercise 94:

      $ ~alleni/bin/cstsubmit 94 lab94answers.txt

C.  To be marked, the file named above must have the exact name given.

D.  If you aren't sure if you've submitted all the necessary files for your
    project, change to a new empty directory and use cstsubmit to fetch your
    submission back, expand it, and check your file name.

E.  All files submitted must be named correctly and have assignment headers.