How to check if the Linux Box is available Post: 302427423

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Operating Systems Linux Red Hat How to check if the Linux Box is available Post 302427423 by pseudocoder on Saturday 5th of June 2010 12:07:00 PM

06-05-2010

Registered User

You could run a daemon/server on the target machines:

Code:

#!/usr/bin/perl

 # server1.pl - a simple server


 use strict;

 use Socket;


 # use port 7890 as default

 my $port = shift || 7890;

 my $proto = getprotobyname('tcp');


 # create a socket, make it reusable

 socket(SERVER, PF_INET, SOCK_STREAM, $proto) or die "socket: $!";

 setsockopt(SERVER, SOL_SOCKET, SO_REUSEADDR, 1) or die "setsock: $!";


 # grab a port on this machine

 my $paddr = sockaddr_in($port, INADDR_ANY);


 # bind to a port, then listen

 bind(SERVER, $paddr)      or die "bind: $!";

 listen(SERVER, SOMAXCONN) or die "listen: $!";

 print "SERVER started on port $port\n";

 $| = 1;


 # for each connection...

 my $client_addr;

 while ($client_addr = accept(CLIENT, SERVER)) {
    # find out who connected
    my ($client_port, $client_ip) =
                     sockaddr_in($client_addr);
    my $client_ipnum = inet_ntoa($client_ip);
    my $client_host =
             gethostbyaddr($client_ip, AF_INET);
    # tell who connected
    print "got a connection from: $client_host",
          " [$client_ipnum]\n";
    # send them a message, close connection
    my $w = `w`;
    # log the access event
    print CLIENT "$w\n ";
    close CLIENT;

 }

Now when you run telnet targetmachine 7890 you will see the output of the command w.
http://targetmachine:7890 should also work.

pseudocoder

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roarclientpass

roarclientpass(1)				       System User's Manual: roarclientpass					 roarclientpass(1)

NAME

       roarclientpass - Passing clients to and creating new listen sockets on RoarAudio sound server

SYNOPSIS

       roarclientpass [OPTIONS]...

DESCRIPTION

       This program let you pass new clients to a RoarAudio sound server as as a proxy and let you add new listen sockets to a running server.

OPTIONS

       --server    SERVER
	      Set server hostname.

       --stdin
	      Client is on stdin.

       --stdout
	      Client is on stdout.

       --stdio
	      Same as --stdin --stdout.

	      This option may for example be used in case of being runed from a inetd.

       --stderr
	      Client is on stderr.

	      Beside  to  make	stderr	known as client fh it will disable error output on stderr.  This must be used in case this program is used
	      from inetd or simular tools.

       --client-fh FH
	      Client is on FH.

	      This is basicly the same as --client-fh on roard(1).

       --proto PROTO
	      Set the protocol used by the client.

	      Defaults to RoarAudio.

       --byteorder BO
	      Sets the byteorder used by the client.

	      Defaults to network byte order.

       --listen
	      Client is a listen connection.

	      This is not the same as --mode listen.

       --mode MODE
	      Set mode of operation: none, listen or connect

	      Defaults to none.

       --bind BIND
	      Set host/node/path for mode listen and connect.

       --port PORT
	      Set port for mode listen and connect.

       --help Show this help

SEE ALSO

       roartips(7), libroar(7), RoarAudio(7).

HISTORY

       For history information see RoarAudio(7).

RoarAudio							     July 2010							 roarclientpass(1)

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