nagixsc.py

   1 import base64
   2 import datetime
   3 import libxml2
   4 import shlex
   5 import subprocess
   6 import sys
   7
   8 def debug(level, verb, string):
   9         if level <= verb:
  10                 print "%s: %s" % (level, string)
  11
  12
  13 ##############################################################################
  14
  15 def available_encodings():
  16         return ['base64', 'plain',]
  17
  18
  19 def check_encoding(enc):
  20         if enc in available_encodings():
  21                 return True
  22         else:
  23                 return False
  24
  25
  26 def decode(data, encoding):
  27         if encoding == 'plain':
  28                 return data
  29         else:
  30                 return base64.b64decode(data)
  31
  32
  33 def encode(data, encoding=None):
  34         if encoding == 'plain':
  35                 return data
  36         else:
  37                 return base64.b64encode(data)
  38
  39
  40 ##############################################################################
  41
  42 def exec_check(host_name, service_descr, cmdline):
  43         try:
  44                 cmd     = subprocess.Popen(shlex.split(cmdline), stdout=subprocess.PIPE)
  45                 output  = cmd.communicate()[0].rstrip()
  46                 retcode = cmd.returncode
  47         except OSError:
  48                 output  = 'Could not execute "%s"' % cmdline
  49                 retcode = 127
  50
  51         return {'host_name':host_name, 'service_description':service_descr, 'returncode':retcode, 'output':output, 'timestamp':datetime.datetime.now().strftime('%s')}
  52
  53
  54 ##############################################################################
  55
  56 def read_xml(options):
  57         if options.url != None:
  58                 import urllib2
  59
  60                 if options.httpuser and options.httppasswd:
  61                         passman = urllib2.HTTPPasswordMgrWithDefaultRealm()
  62                         passman.add_password(None, options.url, options.httpuser, options.httppasswd)
  63                         authhandler = urllib2.HTTPBasicAuthHandler(passman)
  64                         opener = urllib2.build_opener(authhandler)
  65                         urllib2.install_opener(opener)
  66
  67                 try:
  68                         response = urllib2.urlopen(options.url)
  69                 except urllib2.HTTPError, error:
  70                         print error
  71                         sys.exit(0)
  72                 except urllib2.URLError, error:
  73                         print error.reason[1]
  74                         sys.exit(0)
  75
  76                 doc = libxml2.parseDoc(response.read())
  77                 response.close()
  78
  79         else:
  80                 doc = libxml2.parseFile(options.file)
  81
  82         return doc
  83
  84
  85 ##############################################################################
  86
  87 def xml_check_version(xmldoc):
  88         # FIXME: Check XML structure
  89         try:
  90                 xmlnagixsc = xmldoc.xpathNewContext().xpathEval('/nagixsc')[0]
  91         except:
  92                 return (False, 'Not a Nag(IX)SC XML file!')
  93
  94         try:
  95                 if xmlnagixsc.prop('version') != "1.0":
  96                         return (False, 'Wrong version (found "%s", need "1.0") of XML file!' % xmlnagixsc.prop('version'))
  97         except:
  98                 return (False, 'No version information found in XML file!')
  99
 100         return (True, 'XML seems to be ok')
 101
 102
 103 def xml_get_timestamp(xmldoc):
 104         try:
 105                 timestamp = int(xmldoc.xpathNewContext().xpathEval('/nagixsc/timestamp')[0].get_content())
 106         except:
 107                 return False
 108
 109         return timestamp
 110
 111
 112 def xml_to_dict(xmldoc, verb=0, hostfilter=None, servicefilter=None):
 113         checks = []
 114         now = int(datetime.datetime.now().strftime('%s'))
 115         filetimestamp = reset_future_timestamp(xml_get_timestamp(xmldoc), now)
 116
 117         if hostfilter:
 118                 hosts = xmldoc.xpathNewContext().xpathEval('/nagixsc/host[name="%s"] | /nagixsc/host[name="%s"]' % (hostfilter, encode(hostfilter)))
 119         else:
 120                 hosts = xmldoc.xpathNewContext().xpathEval('/nagixsc/host')
 121
 122         for host in hosts:
 123                 xmlhostname = host.xpathEval('name')[0]
 124                 hostname = decode(xmlhostname.get_content(), xmlhostname.prop('encoding'))
 125                 debug(2, verb, 'Found host "%s"' % hostname)
 126
 127                 # Look for Host check result
 128                 if host.xpathEval('returncode'):
 129                         retcode   = host.xpathEval('returncode')[0].get_content()
 130                 else:
 131                         retcode   = None
 132
 133                 if host.xpathEval('output'):
 134                         xmloutput = host.xpathEval('output')[0]
 135                         output    = decode(xmloutput.get_content(), xmloutput.prop('encoding')).rstrip()
 136                 else:
 137                         output    = None
 138
 139                 if host.xpathEval('timestamp'):
 140                         timestamp = reset_future_timestamp(int(host.xpathEval('timestamp')[0].get_content()), now)
 141                 else:
 142                         timestamp = filetimestamp
 143
 144                 if retcode and output:
 145                         checks.append({'host_name':hostname, 'service_description':None, 'returncode':retcode, 'output':output, 'timestamp':timestamp})
 146
 147
 148                 # Look for service filter
 149                 if servicefilter:
 150                         services = host.xpathEval('service[description="%s"] | service[description="%s"]' % (servicefilter, encode(servicefilter)))
 151                 else:
 152                         services = host.xpathEval('service')
 153
 154                 # Loop over services in host
 155                 for service in services:
 156                         service_dict = {}
 157
 158                         xmldescr  = service.xpathEval('description')[0]
 159                         xmloutput = service.xpathEval('output')[0]
 160
 161                         srvdescr = decode(xmldescr.get_content(), xmldescr.prop('encoding'))
 162                         retcode  = service.xpathEval('returncode')[0].get_content()
 163                         output   = decode(xmloutput.get_content(), xmloutput.prop('encoding')).rstrip()
 164
 165                         try:
 166                                 timestamp = reset_future_timestamp(int(service.xpathEval('timestamp')[0].get_content()), now)
 167                         except:
 168                                 timestamp = filetimestamp
 169
 170                         debug(2, verb, 'Found service "%s"' % srvdescr)
 171
 172                         service_dict = {'host_name':hostname, 'service_description':srvdescr, 'returncode':retcode, 'output':output, 'timestamp':timestamp}
 173                         checks.append(service_dict)
 174
 175                         debug(1, verb, 'Host: "%s" - Service: "%s" - RetCode: "%s" - Output: "%s"' % (hostname, srvdescr, retcode, output) )
 176
 177         return checks
 178
 179
 180 def xml_from_dict(checks, encoding='base64'):
 181         lasthost = None
 182
 183         db = [(check['host_name'], check) for check in checks]
 184         db.sort()
 185
 186         xmldoc = libxml2.newDoc('1.0')
 187         xmlroot = xmldoc.newChild(None, 'nagixsc', None)
 188         xmlroot.setProp('version', '1.0')
 189         xmltimestamp = xmlroot.newChild(None, 'timestamp', datetime.datetime.now().strftime('%s'))
 190
 191         for entry in db:
 192                 check = entry[1]
 193
 194                 if check['host_name'] != lasthost:
 195                         xmlhost = xmlroot.newChild(None, 'host', None)
 196                         xmlhostname = xmlhost.newChild(None, 'name', encode(check['host_name'], encoding))
 197                         lasthost = check['host_name']
 198
 199                 if check['service_description'] == '' or check['service_description'] == None:
 200                         # Host check result
 201                         xmlreturncode = xmlhost.newChild(None, 'returncode', str(check['returncode']))
 202                         xmloutput     = xmlhost.newChild(None, 'output', encode(check['output'], encoding))
 203                         xmloutput.setProp('encoding', encoding)
 204                         if check.has_key('timestamp'):
 205                                 xmltimestamp  = xmlhost.newChild(None, 'timestamp', str(check['timestamp']))
 206                 else:
 207                         # Service check result
 208                         xmlservice    = xmlhost.newChild(None, 'service', None)
 209                         xmlname       = xmlservice.newChild(None, 'description', encode(check['service_description'], encoding))
 210                         xmlname.setProp('encoding', encoding)
 211                         xmlreturncode = xmlservice.newChild(None, 'returncode', str(check['returncode']))
 212                         xmloutput     = xmlservice.newChild(None, 'output', encode(check['output'], encoding))
 213                         xmloutput.setProp('encoding', encoding)
 214                         if check.has_key('timestamp'):
 215                                 xmltimestamp  = xmlservice.newChild(None, 'timestamp', str(check['timestamp']))
 216
 217         return xmldoc
 218
 219
 220 def check_mark_outdated(check, now, maxtimediff, markold):
 221         timedelta = now - check['timestamp']
 222         if timedelta > maxtimediff:
 223                 check['output'] = 'Nag(ix)SC: Check result is %s(>%s) seconds old - %s' % (timedelta, maxtimediff, check['output'])
 224                 if markold:
 225                         check['returncode'] = 3
 226         return check
 227
 228
 229 def reset_future_timestamp(timestamp, now):
 230         if timestamp <= now:
 231                 return timestamp
 232         else:
 233                 return now
 234