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<title>MSN Messenger Protocol (Practical Implementation) a.k.a How to make ur own messenger</title>
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<p align="center"><font color="#0000FF" size="5">MSN Messenger
Protocol (Practical Implementation)</font></p>
<p align="center"><font color="#0000FF" size="3">a.k.a</font></p>
<p align="center"><font color="#0000FF" size="5">How to make your
own version of MSN messenger</font></p>
<p align="center"><font color="#FFFFFF"></font> </p>
<p align="center"><font color="#FFFFFF"></font> </p>
<p align="left"><font color="#FFFFFF">You have been using MSN for
quite some time wondering how it works. Well You need not look any further. This article will not just tell you how MSN works but
will also tell you how to make your own version of MSN messenger. You can
download a sample application from here <a href="unify.zip">Unify.zip</a> .Let's
get ready to rumble!!!!</font></p>
<p align="left"><font color="#FFFFFF"></font> </p>
<p align="left"><font color="#FFFFFF">We can split up the working
of MSN messenger into 2 phases</font></p>
<ul>
<li><p align="left"><font color="#FFFFFF">Authentication
Phase</font></p>
</li>
<li><p align="left"><font color="#FFFFFF">Instant Messaging
Phase</font></p>
</li>
</ul>
<p align="left"><font color="#FFFFFF"></font> </p>
<p align="left"><font color="#FFFFFF">The Authentication Phase
involves logging into the MSN messenger server and also (friends)
list retrieval in this case.</font></p>
<p align="left"><font color="#FFFFFF">The Instant Messaging Phase
involves sending/accepting requests for an Instant Messaging
session and also sending/receiving messages.</font></p>
<p align="left"><font color="#FFFFFF"></font> </p>
<p align="left"><font color="#FFFFFF">The MSN messenger protocol
is an ASCII based protocol. In other words the commands are in
pure English !!!.The first phase involves connecting to an MSN
messenger server .In this case we shall connect to the server 64.4.13.58
on port 1863(MSN messenger works through port 1863).</font></p>
<p align="left"><font color="#FFFFFF">Once the connection is done
we need to start the log in process. The first stage in this phase
is the versioning stage. In this stage the client (in this case your
app) lists/sends the versions that it can support to the server
and waits for the server to respond.</font></p>
<p align="left"><font color="#00FFFF">VER 0 MSNP5 MSNP4 CVRO</font></p>
<p align="left"><font color="#FF0000">In the MSN messenger
protocol a "trial id" is sent along with every command. The
trial id starts from 0 and is incremented every time the server
responds successfully to the client's commands.</font></p>
<p align="left"><font color="#FF0000"></font> </p>
<p align="left"><font color="#FFFFFF">The server responds like
this</font></p>
<p align="left"><font color="#00FF00">VER 0 MSNP5 MSNP4</font></p>
<p align="left"><font color="#FFFFFF">The Client and the server
have agreed on a version in which they will communicate.</font></p>
<p align="left"><font color="#FFFFFF"></font> </p>
<p align="left"><font color="#FFFFFF">Next the client sends a
request to the server asking it for the name of the security
package it supports for authentication.</font></p>
<p align="left"><font color="#00FFFF">INF 1</font></p>
<p align="left"><font color="#FF0000">Unlike Yahoo, Rediff and a
few other Messengers MSN does not actually send the password as
it is.It encrypts the password while sending it ensuring that
your password will not be leaked out easily if somebody monitors
your port.</font></p>
<p align="left"><font color="#FF0000"></font> </p>
<p align="left"><font color="#FFFFFF">The server responds with
this </font></p>
<p align="left"><font color="#00FF00">INF 1 MD5</font></p>
<p align="left"><font color="#FFFFFF">Here MD5 is the name of the
security package which the server currently supports.</font></p>
<p align="left"><font color="#FFFFFF">Next the client sends the
userid to the server</font></p>
<p align="left"> </p>
<p align="left"><font color="#00FFFF">USR 2 MD5 I <a href="mailto:venky_dude@hotmail.com">venky_dude@hotmail.com</a></font></p>
<p align="left">Here the server does a check whether it contains all the
relevant details about the user for authentication .If it does not then it sends
the following reply</p>
<p align="left"><font color="#00FF00"> XFR 2 NS 64.4.13.55:1863
0</font></p>
<p align="left"><font color="#FF0000">What the server says is that the client
should connect to the Notification Server(NS) on 64.4.13.55 on port 1863. We
close the current connection and repeat the steps while being connected to
the new server i.e 64.4.13.55</font></p>
<ul>
<li>
<p align="left"><font color="#FF0000">(client) VER 3 MSNP5 MSNP4
CVRO</font></li>
<li>
<p align="left"><font color="#FF0000">(server) VER 3 MSNP5 MSNP4 </font></li>
<li>
<p align="left"><font color="#FF0000">(client) INF 4</font></li>
<li>
<p align="left"><font color="#FF0000">(server) INF 4 MD5</font></li>
<li>
<p align="left"><font color="#FF0000">(client) USR 5 MD5 I
venky_dude@hotmail.com</font></li>
</ul>
<p align="left">Now the server to which we are connected to has the relevant
information about the user trying to log in. The server replies this way</p>
<p align="left"><font color="#00FF00">USR 5 MD5 S
989048851.1851137130</font></p>
<p align="left"><font color="#FFFFFF"></font> The string which is sent by
the server is the " MD5 Hash". It is a hash generated by the server
and is used in the authentication process. The client then has to send the
password which is encrypted using the <a href="http://userpages.umbc.edu/~mabzug1/cs/md5/md5.html">MD5</a>
algorithm.In effect the client has to send the unique <a href="http://userpages.umbc.edu/~mabzug1/cs/md5/md5.html">MD5</a>
equivalent of the <a href="http://userpages.umbc.edu/~mabzug1/cs/md5/md5.html">MD5</a>
hash i.e <font color="#FFFFFF">989048851.1851137130 in this case and the
password combined .i.e. <a href="http://userpages.umbc.edu/~mabzug1/cs/md5/md5.html">MD5</a>
equivalent of (hash+pass). In this case it turns out to be </font><font color="#FFFFFF"> 3b7926d277068ec49576a0c40598ff21.</font></p>
<p align="left"><font color="#00FFFF">USR 6 MD5 S 3b7926d277068ec49576a0c40598ff21</font></p>
<p align="left"><font color="#FFFFFF">If the password is right then the server
replies with this</font></p>
<p align="left"><font color="#00FF00">USR 6 OK venky_dude@hotmail.com venkat</font></p>
<p align="left"><font color="#FFFFFF">Here the last word is the nickname/name by
which the user is known.</font></p>
<p align="left"><font color="#FFFFFF">Now we are logged into the server but our
status is still offline. We need to change our status to online in order to send
and receive messages. The client does this in the following way</font></p>
<p align="left"><font color="#00FFFF">CHG 7 NLN</font></p>
<p align="left"><font color="#FFFFFF">The server replies with some details about
emails in the account and also friends who are online.</font></p>
<p align="left"><font color="#00FF00">CHG 7 NLN<br>
MSG Hotmail Hotmail 221<br>
MIME-Version: 1.0<br>
Content-Type: text/x-msmsgsinitialemailnotification; charset=UTF-8<br>
<br>
Inbox-Unread: 2<br>
Folders-Unread: 0<br>
Inbox-URL: /cgi-bin/HoTMaiL<br>
Folders-URL: /cgi-bin/folders<br>
Post-URL: http://www.hotmail.com</font></p>
<p align="left"><font color="#FFFFFF">To get a list of people who are in our
friends list we may send this command</font></p>
<p align="left"><font color="#00FFFF">LST 8 RL</font></p>
<p align="left">The server responds this way</p>
<p align="left"><font color="#00FF00">LST 8 RL 69 1 19 venky_dude@hotmail.com venkat<br>
LST 8 RL 69 2 19 puxxxxx@hotmail.com PUJA<br>
LST 8 RL 69 3 19 vancxxxxx@hotmail.com ramachandran<br>
LST 8 RL 69 4 19 moxxxxx@hotmail.com chandramouli<br>
LST 8 RL 69 5 19 v_n_xxxxx@hotmail.com Narayanaswamy<br>
LST 8 RL 69 6 19 dexxxxx@hotmail.com Venkatesh<br>
LST 8 RL 69 7 19 lousydxxxxx@hotmail.com deepika%20kalyani%20Vairam
LST 8 RL 69 8 19 hexxxxxr@hotmail.com Hetchar%20Ramachandran<br>
LST 8 RL 69 9 19 ambxxxxx@hotmail.com Aiyer<br>
LST 8 RL 69 10 19 suxxx@hotmail.com Ganesh<br>
LST 8 RL 69 11 19 deexxxxx@hotmail.com Deepak<br>
LST 8 RL 69 12 19 anilxxxxx@hotmail.com anil<br>
LST 8 RL 69 13 19 dixxxxx@hotmail.com <Diamond><br>
LST 8 RL 69 14 19 nvxxxx@hotmail.com giri<br>
LST 8 RL 69 15 19 shxxx@hotmail.com Hari<br>
LST 8 RL 69 16 19 radhikashuxxxxx@hotmail.com radhika<br>
LST 8 RL 69 17 19 eskaxxxxx@hotmail.com kannan<br>
LST 8 RL 69 18 19 shaxxxxx@hotmail.com Shankar<br>
LST 8 RL 69 19 19 puneetagarxxxxx@hotmail.com puneet</font></p>
<p align="left"> </p>
<p align="left"> </p>
<p align="left">*Every time a friend comes online the server(NS) sends us the
following command</p>
<p align="left"><font color="#00FF00">NLN 9 NLN deaxxxx@hotmail.com Venkatesh</font></p>
<p align="left">and when the friend goes offline the server sends us this</p>
<p align="left"><font color="#00FF00">FLN 9 FLN deaxxxx@hotmail.com </font></p>
<p align="left"> </p>
<p align="left"><font color="#FF0000">We have successfully logged into the MSN
Messenger server. The Instant Messaging phase is next.</font></p>
<p align="left">
<a href="msn2.htm"><img border="0" src="jj0041.gif" alt="Next Page" width="100" height="75"></a>
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