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|
#!/usr/bin/perl -wT
#
# Copyright (C) 2004 Jimmy Olsen, Audun Ytterdal
#
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; version 2 dated June,
# 1991.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
#
#
# Simple munin-node. Should be run from inetd or similar.
#
# This should be as small and elegant as possible, to make for easier
# reviewing by sysadmins that want to do simple munin-stuff in high
# security environments.
#
use strict;
$| = 1;
my $clientdir = "@@CONFDIR@@/node.d";
my $conffile = "@@CONFDIR@@/node-simple.conf";
my $version = "@@VERSION@@";
# Empty environment
%ENV = ();
$ENV{PATH} = "/bin:/usr/bin";
# We emptied the environment. There will be no locale issues.
my $config = &read_config($conffile);
my $plugins = &read_plugin_dir($clientdir);
my $hostname;
if (defined $config->{hostname})
{
$hostname = $config->{hostname};
}
elsif (defined $config->{host_name})
{
$hostname = $config->{host_name};
}
else
{
$hostname = `hostname`;
chomp $hostname;
}
print "# munin node at $hostname\n";
while (<>)
{
if (/^\s*list(?:\s+\S+|)\s*$/i)
{ # Print plugin list
print (join (' ', keys (%{$plugins})), "\n");
}
elsif (/^\s*version\s*/i)
{ # Print version number
print "# munin node simple on $hostname version: $version\n";
}
elsif (/^\s*quit\s*/i or /^\s*\.\s*$/)
{ # Drop out
exit (0);
}
elsif (/^\s*config\s+([A-Za-z0-9_]+)\s*$/i)
{
print &run_file ($plugins->{$1}, "config");
print ".\n";
}
elsif (/^\s*fetch\s+([A-Za-z0-9_]+)\s*$/i)
{
print &run_file ($plugins->{$1});
print ".\n";
}
else
{
print "# Unknown command. Try list, config, fetch, version or quit\n";
}
}
exit (0);
sub read_plugin_dir
{
my $cdir = shift;
my $ret = {};
# Open and read the names of the files in the plugin directory
if (-d $cdir)
{
opendir (DIR, $clientdir) or die "Could not open dir \"$cdir\" for reading: $!";
my @files = grep {!/[^A-Za-z0-9_]/} readdir (DIR); # No funky chars
closedir (DIR);
foreach my $file (@files)
{
$ret->{$file} = "$cdir/$file";
}
}
return $ret;
}
sub read_config
{
my $file = shift;
my $ret = {};
if (-f $file)
{
if (open (CONF, $file))
{
while (<CONF>)
{
chomp;
s/#.*//; # Skip comments
next unless /\S/; # Skip empty lines
if (/^\s*([a-zA-Z0-9_]+)\s+(\S+)$/)
{
$ret->{$1} = $2;
}
else
{
warn "Warning: unreadable configuration line in \"$file\": \"$_\".";
}
}
close (CONF);
}
}
return $ret;
}
sub run_file
{
my $file = shift;
my $arg = shift;
if (!defined $file or ! -e $file)
{
return "# Plugin does not exist.\n.\n";
}
my $pid = open (CHILD, "-|");
if (!defined $pid) # Something went wrong
{
return "# Fork error: $!\n.\n";
}
elsif ($pid) # Parent
{
my $tmp = join ('', <CHILD>);
close (CHILD);
if ($?)
{
return "# Error, plugin exited with status $?.\n";
}
else
{
return $tmp;
}
}
else # Child
{
if (defined $arg)
{
# print "# Executing: \"$file\" \"$arg\".\n";
exec $file $file, $arg;
}
else
{
# print "# Executing: \"$file\".\n";
exec $file $file;
}
}
# notreached
}
|
