summaryrefslogtreecommitdiffstats
path: root/src/lib/Bcfg2/Server/Plugins/NagiosGen.py
blob: 0c7b1daf71f6ae894476fd264300b4e4a4d4147a (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
'''This module implements a Nagios configuration generator'''

import os
import re
import sys
import glob
import socket
import logging
import lxml.etree
import Bcfg2.Server
import Bcfg2.Server.Plugin

LOGGER = logging.getLogger('Bcfg2.Plugins.NagiosGen')

line_fmt = '\t%-32s %s'

class NagiosGenConfig(Bcfg2.Server.Plugin.SingleXMLFileBacked,
                      Bcfg2.Server.Plugin.StructFile):
    def __init__(self, filename, fam):
        # create config.xml if missing
        if not os.path.exists(filename):
            LOGGER.warning("NagiosGen: %s missing. "
                           "Creating empty one for you." % filename)
            f = open(filename, "w")
            f.write("<NagiosGen></NagiosGen>")
            f.close()

        try:
            Bcfg2.Server.Plugin.SingleXMLFileBacked.__init__(self,
                                                             filename,
                                                             fam)
        except OSError:
            LOGGER.error("NagiosGen: Failed to read configuration file: %s" % err)
            raise Bcfg2.Server.Plugin.PluginInitError(msg)
        Bcfg2.Server.Plugin.StructFile.__init__(self, filename)


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'
    __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.config = NagiosGenConfig(os.path.join(self.data, 'config.xml'),
                                      core.fam)
        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 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 = ['define host {',
                       line_fmt % ('host_name', metadata.hostname),
                       line_fmt % ('alias', metadata.hostname),
                       line_fmt % ('address', host_address)]

        if host_groups:
            host_config.append(line_fmt % ("hostgroups",
                                           ",".join(host_groups)))

        # read the old-style Properties config, but emit a warning.
        xtra = dict()
        props = None
        if (hasattr(metadata, 'Properties') and
            'NagiosGen.xml' in metadata.Properties):
            props = metadata.Properties['NagiosGen.xml'].data
        if props is not None:
            LOGGER.warn("Parsing deprecated Properties/NagiosGen.xml. "
                        "Update to the new-style config with "
                        "nagiosgen-convert.py.")
            xtra = dict((el.tag, el.text)
                        for el in props.find(metadata.hostname))
            # hold off on parsing the defaults until we've checked for
            # a new-style config

        # read the old-style parents.xml, but emit a warning
        pfile = os.path.join(self.data, "parents.xml")
        if os.path.exists(pfile):
            LOGGER.warn("Parsing deprecated NagiosGen/parents.xml. "
                        "Update to the new-style config with "
                        "nagiosgen-convert.py.")
            parents = lxml.etree.parse(pfile,
                                       parser=Bcfg2.Server.XMLParser)
            for el in parents.xpath("//Depend[@name='%s']" % metadata.hostname):
                if 'parent' in xtra:
                    xtra['parent'] += "," + el.get("on")
                else:
                    xtra['parent'] = el.get("on")

        # read the new-style config and overwrite the old-style config
        for el in self.config.Match(metadata):
            if el.tag == 'Option':
                xtra[el.get("name")] = el.text

        # if we haven't found anything in the new- or old-style
        # configs, finally read defaults from old-style config
        if not xtra and props is not None:
            xtra = dict((el.tag, el.text) for el in props.find('default'))

        if xtra:
            host_config.extend([line_fmt % (opt, val)
                                for opt, val in list(xtra.items())])
        else:
            host_config.append(line_fmt % ('use', 'default'))

        host_config.append('}')
        entry.text = "%s\n" % "\n".join(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(entry.text)
            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:
            host_data.append(open(host, 'r').read())

        for group in group_configs:
            group_name = re.sub("(-group.cfg|.*/(?=[^/]+))", "", group)
            if "\n".join(host_data).find(group_name) != -1:
                groupfile = open(group, 'r')
                group_data.append(groupfile.read())
                groupfile.close()

        entry.text = "%s\n\n%s" % ("\n".join(group_data), "\n".join(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(entry.text)
            fileh.close()
        except OSError:
            ioerr = sys.exc_info()[1]
            LOGGER.error("Failed to write %s/nagiosgen.cfg" % self.data)
            LOGGER.error(ioerr)