CentOS - Dec 2010 - Network communication between hosts

Hi,


 I need advice about developing C++ program. I need to develop 2 application
which must communicate via network using SSL encryption. The problem is in which
format to exchange the data. I can use XML format to exchange data between the
hosts but a lot traffic will be generated. What are the usual practices to
exchange data between the hosts?

Regards
Peter 
 
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On 12/28/10 4:09 PM, derleader __ wrote:
>  Hi,
>    I need advice about developing C++ program. I need to develop 2 
> application which must communicate via network using SSL encryption. 
> The problem is in which format to exchange the data. I can use XML 
> format to exchange data between the hosts but a lot traffic will be 
> generated. What are the usual practices to exchange data between the 
> hosts?
rather offtopic for this list.    but...

XML is about the most inefficient format imaginable, typically exploding 
your data to many times its original size, especially if it has lots of 
small fields

what format is the data in now that you're exchanging?  I'd want to use 
something close to the native format of the data.   if performance is 
important, you'll want to transmit the data in binary as close to its 
native format as possible.   if its complex structured data such as is 
often expressed in XML, you could look at defining a binary interchange 
format with JSON or ASN.1, but I'd be more inclined to roll my own 
simple binary message format since its just between your own two programs.

Thank you for the reply.


 The data is not so much - CPU utilization, RAM utilization, List of installed
software, list of users and so on. The information is not so much. What are the
options for this task is there a C++ library that I can use to convert the data
and then to transfer if via network?

Regards 
Peter


  >>    I need advice about developing C++ program. I need to develop 2 
 >> application which must communicate via network using SSL encryption. 
 >> The problem is in which format to exchange the data. I can use XML 
 >> format to exchange data between the hosts but a lot traffic will be 
 >> generated. What are the usual practices to exchange data between the 
 >> hosts?
 >
 >rather offtopic for this list.    but...
 >
 >XML is about the most inefficient format imaginable, typically exploding 
 >your data to many times its original size, especially if it has lots of 
 >small fields
 >
 >what format is the data in now that you're exchanging?  I'd want to
use
 >something close to the native format of the data.   if performance is 
 >important, you'll want to transmit the data in binary as close to its 
 >native format as possible.   if its complex structured data such as is 
 >often expressed in XML, you could look at defining a binary interchange 
 >format with JSON or ASN.1, but I'd be more inclined to roll my own 
 >simple binary message format since its just between your own two programs.
 >
 >
 >
 >
 >_______________________________________________
 >CentOS mailing list
 >CentOS at centos.org
 >http://lists.centos.org/mailman/listinfo/centos
 >
 
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At Wed, 29 Dec 2010 02:28:48 +0200 (EET) CentOS mailing list <centos at
centos.org> wrote:
> 
> 
> 
>  Thank you for the reply.
> 
> 
>  The data is not so much - CPU utilization, RAM utilization, List of
installed software, list of users and so on. The information is not so much.
What are the options for this task is there a C++ library that I can use to
convert the data and then to transfer if via network?
You might really do better using a scripting language, such as Tcl,
Perl, or Python.  Doing socket-level I/O (with or without SSL) in C or
C++ is a non-trivial process.

> 
> Regards 
> Peter
> 
> 
>   >>    I need advice about developing C++ program. I need to develop
2
>  >> application which must communicate via network using SSL
encryption.
>  >> The problem is in which format to exchange the data. I can use
XML
>  >> format to exchange data between the hosts but a lot traffic will
be
>  >> generated. What are the usual practices to exchange data between
the
>  >> hosts?
>  >
>  >rather offtopic for this list.    but...
>  >
>  >XML is about the most inefficient format imaginable, typically
exploding
>  >your data to many times its original size, especially if it has lots
of
>  >small fields
>  >
>  >what format is the data in now that you're exchanging?  I'd
want to use
>  >something close to the native format of the data.   if performance is 
>  >important, you'll want to transmit the data in binary as close to
its
>  >native format as possible.   if its complex structured data such as is
>  >often expressed in XML, you could look at defining a binary
interchange
>  >format with JSON or ASN.1, but I'd be more inclined to roll my own
>  >simple binary message format since its just between your own two
programs.
>  >
>  >
>  >
>  >
>  >_______________________________________________
>  >CentOS mailing list
>  >CentOS at centos.org
>  >http://lists.centos.org/mailman/listinfo/centos
>  >
>  
> MIME-Version: 1.0
> 
> _______________________________________________
> CentOS mailing list
> CentOS at centos.org
> http://lists.centos.org/mailman/listinfo/centos
> 
>                                                                     
-- 
Robert Heller             -- 978-544-6933 / heller at deepsoft.com
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On 12/28/10 6:28 PM, derleader __ wrote:
> Thank you for the reply.
> The data is not so much - CPU utilization, RAM utilization, List of
installed
> software, list of users and so on. The information is not so much. What are
the
> options for this task is there a C++ library that I can use to convert the
data
> and then to transfer if via network?
Most of that is already available via snmp.  Are you sure you need to re-invent
it?

-- 
   Les Mikesell
    lesmikesell at gmail.com

derleader __ wrote:
>  The data is not so much - CPU utilization, RAM utilization, List of
>  installed software, list of users and so on. The information is not
>  so much. What are the options for this task is there a C++ library
>  that I can use to convert the data and then to transfer if via
>  network?
The information you want may already be available over the network via
snmp. The canonical invocation from the client host goes something like:

  snmpwalk -v2c -c public serverhostname

Once you've sorted through the output, you'll want to switch to more
targeted requests using snmpget or suchlike, change the community
string, consider whether or not to use snmpV3, etc.  You can invoke
these system utilities from C++. If snmpwalk is not installed on your
system try installing net-snmp on the remote (server) host,
net-snmp-utils and net-snmp-libs on the client host.
-- 
Charles Polisher