client server socket interaction (inetd)
icanbob at gmail.com
Thu Feb 17 15:47:07 EST 2011
On Feb 17, 2:41 pm, Martin Gregorie <mar... at address-in-sig.invalid>
> On Thu, 17 Feb 2011 08:14:36 -0800, Tim wrote:
> > Hi, I have an inetd service on freebsd that calls a program (daemon.py)
> > with which I want the remote user to communicate. I can call daemon.py
> > from the command line on the host machine and it works fine.
> > What I don't understand is how to make my remote client script actually
> > communicate. If I'm understanding correctly, the code below just takes a
> > message and sends it to inetd and writes the stdout from the process to
> > the client.
> > How can I modify the code to send a response back?
> The code you've shown would appear to be doing what you've specified,
> though only you can know whether this is what you intended.
> Each time you run the client it:
> - connects to the server
> - sends a request
> - reads the response(s)
> - closes the socket and exits.
> If you run it a second time it should do the same again. Is this the case?
> An inetd server should be started when a connection request is received.
> It should read requests, sending a response to each request in turn,
> until the connection is closed, when it will be stopped by inetd.
> Without seeing the code for the server and the corresponding inetd
> configuration line its not possible to say more.
> BTW, I prefer xinetd to inetd - its configuration is much more modular
> and easier to understand. If freebsd supports xinetd it may make life
> easier if you use it rather than inetd.
> Here's the outline
> > of what I want to do:
> > (1) client sends the message to the server (client -> inetd ->
> > daemon.py),
> > (2) client receives output back from the server, (3) client user
> > responds to a question from the remote process (4) client continues to
> > receive output back.
> > where 2-3-4 happen as needed by the remote process. Cries out for a
> > while loop doesn't it? I just don't know what to put in it. Currently I
> > just have steps 1 and 2 working. Client sends one message and gets all
> > output back. If server asks a question, processes deadlock with server
> > waiting and client unable to respond. thanks,
> > --Tim Arnold
> > # imports, constants set
> > #def line_buffer(sock):
> > # code to yield the string response in # blocks of 1024 bytes
> > def client(ip,port,message):
> > sock = socket.socket(socket.AF_INET,socket.SOCK_STREAM)
> > sock.connect((ip,port))
> > sock.send(message)
> > for line in line_buffer(sock):
> > print line
> > sock.close()
> > if __name__ == '__main__':
> > message = ' '.join(sys.argv[1:]) )
> > print 'working... %s %s' % (SERVER_IP,SERVER_PORT)
> > client(SERVER_IP,SERVER_PORT,message) print 'done.'
> martin@ | Martin Gregorie
> gregorie. | Essex, UK
> org |
Have a look at the SIMPL toolkit (http://www.icanprogram.com/06py/
lesson1/lesson1.html). It will allow you to do exactly what you want
without having to dive into socket programming.
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