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Top Forums Programming Client/Server Socket Application - Preventing Client from quitting on server crash Post 302348118 by varun.nagpaal on Thursday 27th of August 2009 10:56:02 AM
Old 08-27-2009
Client/Server Socket Application - Preventing Client from quitting on server crash

Problem
- Linux Client/Server Socket Application: Preventing Client from quitting on server crash

Hi,
I am writing a Linux socket Server and Client using TCP protocol on Ubuntu 9.04 x64.

I am having problem trying to implement a scenario where the client should keep running even when the server crashes(because of any reason).

By default, when server closes because of error or when killed by closing the window, the client also quits. I have to somehow handle this situation and make sure the client keeps on running and restarts under this scenario.

I think I need to do handle some unix signals in my client application, I am not sure which ones and how? Can anyone suggest how to go about doing this.

Thanks for suggestions in advance.

Regards
Varun
 

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Net::Server::Proto::SSL(3)				User Contributed Perl Documentation				Net::Server::Proto::SSL(3)

NAME
Net::Server::Proto::SSL - Net::Server SSL protocol. SYNOPSIS
See Net::Server::Proto. DESCRIPTION
Experimental. If anybody has any successes or ideas for improvment under SSL, please email <paul@seamons.com>. Protocol module for Net::Server. This module implements a secure socket layer over tcp (also known as SSL). See Net::Server::Proto. There is a limit inherent from using IO::Socket::SSL, namely that only one SSL connection can be maintained by Net::Server. However, Net::Server should also be able to maintain any number of TCP, UDP, or UNIX connections in addition to the one SSL connection. Additionally, getline support is very limited and writing directly to STDOUT will not work. This is entirely dependent upon the implementation of IO::Socket::SSL. getline may work but the client is not copied to STDOUT under SSL. It is suggested that clients sysread and syswrite to the client handle (located in $self->{server}->{client} or passed to the process_request subroutine as the first argument). PARAMETERS
In addition to the normal Net::Server parameters, any of the SSL parameters from IO::Socket::SSL may also be specified. See IO::Socket::SSL for information on setting this up. BUGS
Christopher A Bongaarts pointed out that if the SSL negotiation is slow then the server won't be accepting for that period of time (because the locking of accept is around both the socket accept and the SSL negotiation). This means that as it stands now the SSL implementation is susceptible to DOS attacks. To fix this will require deviding up the accept call a little bit more finely which may not yet be possible with IO::Socket::SSL. Any ideas or patches on this bug are welcome. LICENCE
Distributed under the same terms as Net::Server THANKS
Thanks to Vadim for pointing out the IO::Socket::SSL accept was returning objects blessed into the wrong class. perl v5.12.1 2007-02-03 Net::Server::Proto::SSL(3)
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