pandorafms/pandora_agents/pc/plugins/pandora_update

#!/usr/bin/perl
# Update binary tool
# Copyright (c) 2010 Artica Soluciones Tecnologicas S.L.
# Copyright (c) Sancho Lerena <slerena@artica.es>

use strict;
use warnings;
use POSIX qw(strftime);
use Cwd 'abs_path';
use File::Basename;
use File::Copy;
use FindBin;
use Digest::MD5 qw(md5);

# Time to wait before the service stops
use constant SERVICE_STOP_WAIT => 5;

# This tool is intented to be used to update pandora agent binaries using
# the file collection feature. This will work using a module like this:

# Unix

# module_begin
# module_name Pandora_Update
# module_type async_string
# module_exec nohup pandora_update fc_1 2> /dev/null && tail -1 nohup.out 2> /dev/null
# module_description Module to check new version of pandora agent and update itself
# module_end

# Windows:

# module_begin
# module_name Pandora_Update
# module_type async_string
# module_exec pandora_update.exe fc_1
# module_description Module to check new version of pandora agent and update itself
# module_end


# This small function return the current base path (where this tool is stored)

sub return_basepath () {
	return $FindBin::Bin;
}

# Function to compare two binary files. Return 0 if different 1 if equal, 2 error

sub compare_twofiles ($$) {

	my $file1 = $_[0];
	my $file2 = $_[1];

	my $size1 = -s $file1;
	my $size2 = -s $file2;

	# Size matters;

	if ((!defined($size1)) || (!defined($size2))){
		return 2;
	}

	if ($size1 != $size2){
		return 0;
	}

	open FILE1, $file1;
	binmode FILE1;
	my $data1 = join ('', <FILE1>);
	close FILE1;
	my $hash1 = md5($data1);

	open FILE2, $file2;
	binmode FILE2;
	my $data2 = join ('', <FILE2>);
	close FILE2;
	my $hash2 = md5($data2);

	if ($hash1 eq $hash2){
		return 1;
	}

	return 0;
}

# Get agent pid
sub get_agent_pid ($$) {
	my $daemon = shift;
	my $app_path = shift;

	$ENV{'COLUMNS'}=400;
	my $os_name=`uname -s`;
	my $pid = "";
	my $cmd = "";

	if ($os_name eq "HP-UX") {

		$cmd ="ps -ex | grep \"$daemon $app_path\" | grep -v grep | head -1 | awk '{ print \$1 }'";
	} 
	elsif ($os_name =~ /SunOS/) {
		my $cmd_aux="echo \"$daemon $app_path\" | cut -c1-40";
		my $truncated_daemon = `$cmd_aux`;

		chop($truncated_daemon);

		my $zone = `/bin/zonename`;

		if ( $zone =~ /global/) {
			$cmd ="ps -f -z global | grep \"$truncated_daemon\" | grep -v grep | head -1 | awk '{ print \$2 }'";
	   	} else {
			$cmd ="ps -Af | grep \"$truncated_daemon\" | grep -v grep | head -1 | awk '{ print \$2 }'";
		}
	} else {
		$cmd ="ps -Af | grep \"$daemon $app_path\" | grep -v grep | head -1 | awk '{ print \$2 }'";
	}

	$pid = `$cmd`;
	return $pid;

}

# -------------------------------------------------------------------------

# MAIN CODE starts here


# Get the required path (relative to basepath) to find pandora agent binary

if ($#ARGV < 0) {
	print "Usage: $0 <relative path (filecollection id) [custom_path]\n";
	print "For example: $0 fc2 /var/opt/PandoraFMS\n\n";
	exit 1;
}

my $fc_path = $ARGV[0];
my $base_path = return_basepath();
my $opt_dir = "";

if (defined($ARGV[1])) {
	$opt_dir = $ARGV[1];
}

# Setup your particular paths / process settings here
# [SETUP BEGIN] ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

# Location of binaries 

# Unix 
my ($running_binary, $updated_binary, $conf_path);
if ($^O eq 'freebsd') {
	$running_binary = $opt_dir."/usr/local/bin/pandora_agent";
	$updated_binary = $opt_dir."/usr/local/etc/pandora/collections/$fc_path/pandora_agent";
	$conf_path = $opt_dir."/usr/local/etc/pandora";
} else {
	$running_binary = $opt_dir."/usr/bin/pandora_agent";
	$updated_binary = $opt_dir."/etc/pandora/collections/$fc_path/pandora_agent";
	$conf_path = $opt_dir."/etc/pandora";
}

# Windows 

#my $running_binary = $base_path."/../PandoraAgent.exe";
#my $updated_binary = $base_path."/../collections/$fc_path/PandoraAgent.exe";

# Location of service start / stop commands

# Unix style

my $start_pandora;
my $stop_pandora;
if ($^O eq 'freebsd') {
	$start_pandora = $opt_dir."/usr/local/etc/rc.d/pandora_agent start";
	$stop_pandora = $opt_dir."/usr/local/etc/rc.d/pandora_agent stop";
} else {
	$start_pandora = $opt_dir."/etc/init.d/pandora_agent_daemon start";
	$stop_pandora = $opt_dir."/etc/init.d/pandora_agent_daemon stop";
}

# Windows stuff

#my $start_pandora = "net start \"Pandora FMS Agent\"";
#my $stop_pandora = "net stop \"Pandora FMS Agent\"";

# Local log/temp file

# Unix
my $local_log = "/tmp/pandora_update.log";

# Windows
#my $local_log = $base_path. "/../pandora_update.log";

# [SETUP END]~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

if (compare_twofiles ($running_binary, $updated_binary) == 0 ){
	# Do the update

	# Create the temp file to "acknoledge" a update has been succeed
	open (FILE3,">$local_log");
	close (FILE3);

	my $ppid = get_agent_pid($running_binary, $conf_path);

	# Kill parent process (a.k.a the Agent)
	my $output = `kill -9 $ppid`;
	sleep SERVICE_STOP_WAIT;

	# Copy the updated agent
	copy($updated_binary, $running_binary) or unlink $local_log;

	# Starting the agent again
	my $log = $opt_dir."/var/log/pandora/pandora_agent.log";
	$output = `nohup $running_binary $conf_path >/dev/null 2>$log &`
	

} else {
	if (-e $local_log){
		print "Updated binary from $updated_binary\n";
		unlink $local_log;
	}
}

exit;