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How to encapsulate this ?

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Old 11-14-2006
How to encapsulate this ?
Hello !

I have a pretty question.I am working on a client-server chat aplication for Linux shell's.

When a user connect , is receives a window for the username . It has to enter the username, which will be used for future chat and private message ( + other option's ). I'm using socket's for network connection.

The point is , after a user is connect to server socket , the user has to enter a username . The problem here comes like that. Where does the chat server knew , if the username string is an ordinary string , used for chat , or the username string itself ?

I figure to do , some easy encaspulation.When the client connect , and receive username window , the username string is encapsulated with , let's say "***" at the end .

Let's say user !_30 is connected . First the client sends "!_30***" to server , the server dencapsulate those 3 '***' , and knows client username.

The problem here is that , when a user accidentaly send's "***" in main chat , whole sistem is doomed . The server sees "***" at the end .. of ( nothing ) and think's a new user is connected to the server.

How can I make this encapsulation/dencapsulation , transparent to send proces , not altering the string , and be doomed like up ..?

Any idea's , raw socket's ? Because the idea I mention is the only one that came , in that moment in my head .


Any ideas , is apreciate ! Cheer's ! Smilie
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LEARN ABOUT DEBIAN

rxterm

RXTERM(1)						    BSD General Commands Manual 						 RXTERM(1)

NAME

     rxterm -- start a secure remote xterm

SYNOPSIS

     rxterm [-l username] [-k] [-r rsh_args] [-x xterm_args] [-K kx_args] [-w term_emulator] [-b rsh_program] host [port]

DESCRIPTION

     The rxterm program starts an xterm window on host host.  From this window you will also be able to run X clients that will be able to connect
     securely to your X server. If port is given, that port will be used instead of the default.

     The supported options are:

     -l      Log in on the remote host as user username.

     -k      Disable keep-alives.

     -r      Send rsh_args as arguments to rsh.

     -x      Send xterm_args as arguments to xterm.

     -X      Send kx_args as arguments to kx.

     -w      Use term_emulator instead of xterm.

     -b      Use rsh_program instead of rsh.

     -v      Be verbose.

EXAMPLE

     To login from host foo (where your display is) to host bar, you might do the following.

     1.   On foo: rxterm bar

     2.   You will get a new window running an xterm on host bar.  In this window you will be able to start X clients.

SEE ALSO

     kx(1), rsh(1), rxtelnet(1), tenletxr(1), kxd(8)

KTH_KRB 							  April 11, 2003							   KTH_KRB