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'''This module implements a Nagios configuration generator'''
import glob
import logging
import lxml.etree
import os
import re
import socket
import Bcfg2.Server.Plugin
LOGGER = logging.getLogger('Bcfg2.Plugins.NagiosGen')
host_config_fmt = \
'''
define host{
host_name %s
alias %s
address %s
'''
class NagiosGen(Bcfg2.Server.Plugin.Plugin,
Bcfg2.Server.Plugin.Generator):
"""NagiosGen is a Bcfg2 plugin that dynamically generates
Nagios configuration file based on Bcfg2 data.
"""
name = 'NagiosGen'
__version__ = '0.6'
__author__ = 'bcfg-dev@mcs.anl.gov'
def __init__(self, core, datastore):
Bcfg2.Server.Plugin.Plugin.__init__(self, core, datastore)
Bcfg2.Server.Plugin.Generator.__init__(self)
self.Entries = {'Path':
{'/etc/nagiosgen.status': self.createhostconfig,
'/etc/nagios/nagiosgen.cfg': self.createserverconfig}}
self.client_attrib = {'encoding': 'ascii',
'owner': 'root',
'group': 'root',
'type': 'file',
'perms': '0400'}
self.server_attrib = {'encoding': 'ascii',
'owner': 'nagios',
'group': 'nagios',
'type': 'file',
'perms': '0440'}
def getparents(self, hostname):
"""Return parents for given hostname."""
depends = []
if not os.path.isfile('%s/parents.xml' % (self.data)):
return depends
tree = lxml.etree.parse('%s/parents.xml' % (self.data))
for entry in tree.findall('.//Depend'):
if entry.attrib['name'] == hostname:
depends.append(entry.attrib['on'])
return depends
def createhostconfig(self, entry, metadata):
"""Build host specific configuration file."""
host_address = socket.gethostbyname(metadata.hostname)
host_groups = [grp for grp in metadata.groups if \
os.path.isfile('%s/%s-group.cfg' % (self.data, grp))]
host_config = host_config_fmt % \
(metadata.hostname, metadata.hostname, host_address)
if host_groups:
host_config += ' hostgroups %s\n' % (",".join(host_groups))
xtra = None
if hasattr(metadata, 'Properties') and \
'NagiosGen.xml' in metadata.Properties:
for q in (metadata.hostname, 'default'):
xtra = metadata.Properties['NagiosGen.xml'].data.find(q)
if xtra is not None:
break
if xtra is not None:
directives = list(xtra)
for item in directives:
host_config += ' %-32s %s\n' % (item.tag, item.text)
else:
host_config += ' use default\n'
host_config += '}\n'
entry.text = host_config
[entry.attrib.__setitem__(key, value) for \
(key, value) in list(self.client_attrib.items())]
try:
fileh = open("%s/%s-host.cfg" % \
(self.data, metadata.hostname), 'w')
fileh.write(host_config)
fileh.close()
except OSError:
ioerr = sys.exc_info()[1]
LOGGER.error("Failed to write %s/%s-host.cfg" % \
(self.data, metadata.hostname))
LOGGER.error(ioerr)
def createserverconfig(self, entry, _):
"""Build monolithic server configuration file."""
host_configs = glob.glob('%s/*-host.cfg' % self.data)
group_configs = glob.glob('%s/*-group.cfg' % self.data)
host_data = ""
group_data = ""
for host in host_configs:
hostfile = open(host, 'r')
hostname = host.split('/')[-1].replace('-host.cfg', '')
parents = self.getparents(hostname)
if parents:
hostlines = hostfile.readlines()
else:
hostdata = hostfile.read()
hostfile.close()
if parents:
hostdata = ''
addparents = True
for line in hostlines:
line = line.replace('\n', '')
if 'parents' in line:
line += ',' + ','.join(parents)
addparents = False
if '}' in line:
line = ''
hostdata += "%s\n" % line
if addparents:
hostdata += " parents %s\n" % ','.join(parents)
hostdata += "}\n"
host_data += hostdata
for group in group_configs:
group_name = re.sub("(-group.cfg|.*/(?=[^/]+))", "", group)
if host_data.find(group_name) != -1:
groupfile = open(group, 'r')
group_data += groupfile.read()
groupfile.close()
entry.text = group_data + host_data
[entry.attrib.__setitem__(key, value) for \
(key, value) in list(self.server_attrib.items())]
try:
fileh = open("%s/nagiosgen.cfg" % (self.data), 'w')
fileh.write(group_data + host_data)
fileh.close()
except OSError:
ioerr = sys.exc_info()[1]
LOGGER.error("Failed to write %s/nagiosgen.cfg" % (self.data))
LOGGER.error(ioerr)
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