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Multi-client echo server

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Special Forums IP Networking Multi-client echo server
# 1  
Old 05-16-2008
Multi-client echo server
Hello

I am currently learning how to program a multi-client server. I still have some code to configure, however I think I am fairly near to the end.

My main problem is that whenever I connect with one client and receive an echo, do the same with another client and receive an echo, then try and receive another echo for the first client the server seems to stall at the point where it is supposed to receive the message. The client says it has sent the message so I don't know why this is happening.

And yet when server doesn't send an echo back to the first client, the second client can operate normally. I've also noticed that only when the second client closes does the echo to the first client return, but this is obviously not what I intended.


The echo service works fine in single client mode, it is when simultaneous access is attempted that problems arise.

Could anyone tell me why this is happening?

Any help would be much appreciated.
Last edited by slanj; 05-16-2008 at 07:30 PM..
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LEARN ABOUT ULTRIX

telnetd

telnetd(8c)															       telnetd(8c)

Name
       telnetd - DARPA TELNET protocol server

Syntax
       /etc/telnetd

Description
       The  server  supports the DARPA standard TELNET virtual terminal protocol.  The TELNET server is invoked when receives a connection request
       on the port indicated in the TELNET service description.

       The server operates by allocating a pseudo-terminal device for a client, then creating a login process which has  the  slave  side  of  the
       pseudo-terminal	as stdin, stdout, and stderr.  The server manipulates the master side of the pseudo terminal, implementing the TELNET pro-
       tocol and passing characters between the client and login process.

       When a TELNET session is started up, sends a TELNET option to the client side indicating a willingness to do remote echo of characters,	to
       suppress  go  ahead, and to receive terminal type information from the remote client.  If the remote client is willing, the remote terminal
       type is propagated in the environment of the created login process.  The pseudo terminal allocated to the client is configured  to  operate
       in cooked mode and with XTABS and CRMOD enabled.

       Aside  from  this  initial  setup, the only mode changes will carry out are those required for echoing characters at the client side of the
       connection.

       The server supports binary mode, suppress go ahead, echo, and timing mark.  It also allows a remote client to do binary, terminal type, and
       suppress go ahead.

Restrictions
       Some TELNET commands are only partially implemented.

       The TELNET protocol allows the exchange of the number of lines and columns on the user's terminal, but does not make use of them.

       The terminal type name received from the remote client is converted to lower case.

       The server never sends TELNET go ahead commands.

See Also
       telnet(1c), pty(4), tty(4), services(5), inetd(8c)

																       telnetd(8c)