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#!/usr/bin/env python
'''The XML-RPC Bcfg2 Server'''
__revision__ = '$Revision:$'
from getopt import getopt, GetoptError
from sys import argv, exc_info
from syslog import openlog, LOG_LOCAL0, syslog, LOG_INFO, LOG_ERR
from Bcfg2.Server.Core import Core, CoreInitError
from Bcfg2.Server.Metadata import MetadataConsistencyError
from Bcfg2.Server.Component import Component
from threading import Lock
from select import select, error as selecterror
from signal import signal, SIGINT, SIGTERM
from traceback import extract_tb
from xmlrpclib import Fault
from socket import gethostbyaddr, herror
from lxml.etree import XML, Element, tostring
from M2Crypto.SSL import SSLError
def critical_error(operation):
'''Print tracebacks in unexpected cases'''
syslog(LOG_ERR, "Traceback information (please include in any bug report):")
(ttype, value, trace) = exc_info()
for line in extract_tb(trace):
syslog(LOG_ERR, "File %s, line %i, in %s\n %s" % (line))
syslog(LOG_ERR, "%s: %s" % (ttype, value))
del trace, val, trb
warning_error("An unexpected failure occurred in %s" % (operation) )
def fatal_error(message):
'''Signal a fatal error'''
syslog(LOG_ERR, "Fatal error: %s" % (message))
raise SystemExit, 1
def warning_error(message):
'''Warn about a problem but continue'''
syslog(LOG_ERR,"Warning: %s\n" % (message))
def usage_error(message, opt, vopt, descs, argDescs):
'''Die because script was called the wrong way'''
print "Usage error: %s" % (message)
print_usage(opt, vopt, descs, argDescs)
raise SystemExit, 2
verboseMode = False
def verbose(message):
'''Conditionally output information in verbose mode'''
global verboseMode
if(verboseMode == True):
syslog(LOG_INFO, "%s" % (message))
def print_usage(opt, vopt, descs, argDescs):
print "Bcfg2Server usage:"
for arg in opt.iteritems():
print " -%s\t\t\t%s" % (arg[0], descs[arg[0]])
for arg in vopt.iteritems():
print " -%s %s\t%s" % (arg[0], argDescs[arg[0]], descs[arg[0]])
def dgetopt(arglist, opt, vopt, descs, argDescs):
'''parse options into a dictionary'''
global verboseMode
ret = {}
for optname in opt.values() + vopt.values():
ret[optname] = False
gstr = "".join(opt.keys()) + "".join([optionkey + ':' for optionkey in vopt.keys()])
try:
ginfo = getopt(arglist, gstr)
except GetoptError, gerr:
usage_error(gerr, opt, vopt, descs, argDescs)
for (gopt, garg) in ginfo[0]:
option = gopt[1:]
if opt.has_key(option):
ret[opt[option]] = True
else:
ret[vopt[option]] = garg
if ret["help"] == True:
print_usage(opt, vopt, descs, argDescs)
raise SystemExit, 0
if ret["verbose"] == True:
verboseMode = True
return ret
class Bcfg2(Component):
"""The Bcfg2 Server component providing XML-RPC access to Bcfg methods"""
__name__ = 'bcfg2'
__implementation__ = 'bcfg2'
request_queue_size = 15
def __init__(self, setup):
Component.__init__(self, setup)
self.shut = False
# set shutdown handlers for sigint and sigterm
signal(SIGINT, self.start_shutdown)
signal(SIGTERM, self.start_shutdown)
try:
self.Core = Core(setup, setup['configfile'])
self.CoreLock = Lock()
except CoreInitError, msg:
fatal_error(msg)
self.funcs.update({
"GetConfig": self.Bcfg2GetConfig,
"GetProbes": self.Bcfg2GetProbes,
"RecvProbeData": self.Bcfg2RecvProbeData,
"RecvStats": self.Bcfg2RecvStats
})
for plugin in self.Core.plugins.values():
for method in plugin.__rmi__:
self.register_function(getattr(self.Core.plugins[plugin.__name__], method),
"%s.%s" % (plugin.__name__, method))
def get_request(self):
'''We need to do work between requests, so select with timeout instead of blocking in accept'''
rsockinfo = []
famfd = self.Core.fam.fileno()
while self.socket not in rsockinfo:
if self.shut:
raise SSLError
try:
rsockinfo = select([self.socket, famfd], [], [], 15)[0]
except selecterror:
raise SSLError
if famfd in rsockinfo:
self.Core.fam.Service()
if self.socket in rsockinfo:
# workaround for m2crypto 0.15 bug
self.socket.postConnectionCheck = None
return self.socket.accept()
def serve_forever(self):
"""Handle one request at a time until doomsday."""
while not self.shut:
self.handle_request()
def start_shutdown(self, signum, frame):
'''Shutdown on unexpected signals'''
self.shut = True
def handle_error(self):
'''Catch error path for clean exit'''
return False
def resolve_client(self, client):
try:
return gethostbyaddr(client)[0]
except herror:
warning = "host resolution error for %s" % (client)
warning_error(warning)
raise Fault, warning
def Bcfg2GetProbes(self, address):
'''Fetch probes for a particular client'''
client = self.resolve_client(address[0])
resp = Element('probes')
try:
meta = self.Core.metadata.FetchMetadata(client)
except MetadataConsistencyError:
warning = 'metadata consistency error'
warning_error(warning)
raise Fault, warning
for generator in self.Core.generators:
for probe in generator.GetProbes(meta):
resp.append(probe)
return tostring(resp)
def Bcfg2RecvProbeData(self, address, probedata):
'''Receive probe data from clients'''
client = self.resolve_client(address[0])
for data in probedata:
try:
[generator] = [gen for gen in self.Core.generators if gen.__name__ == data.get('source')]
generator.ReceiveData(client, data)
except IndexError:
warning_error("Failed to locate plugin %s" % (data.get('source')))
except:
critical_error("probe data receipt")
return True
def Bcfg2GetConfig(self, address, image=False, profile=False):
'''Build config for a client'''
client = self.resolve_client(address[0])
if image and profile:
try:
# if metadata is provided, call FetchMetadata with settings
# it is screwy. i know.
self.Core.metadata.FetchMetadata(client, image=image, profile=profile)
except MetadataConsistencyError:
warning = 'metadata consistency error'
warning_error(warning)
raise Fault, warning
return tostring(self.Core.BuildConfiguration(client))
def Bcfg2RecvStats(self, address, stats):
'''Act on statistics upload'''
sdata = XML(stats)
state = sdata.find(".//Statistics")
# Versioned stats to prevent tied client/server upgrade
if state.get('version') >= '2.0':
client = self.resolve_client(address[0])
# Update statistics
self.Core.stats.updateStats(sdata, client)
verbose("Client %s reported state %s" %
(client, state.attrib['state']))
return "<ok/>"
if __name__ == '__main__':
openlog("Bcfg2", 0, LOG_LOCAL0)
options = {
'v':'verbose',
'd':'debug',
'h':'help'
}
doptions = {
'D':'daemon',
'c':'configfile',
'C':'client'
}
descriptions = {
'v': "enable verbose output",
'd': "enable debugging output",
'D': "daemonise the server, storing PID",
'c': "set the server's config file",
'C': "always return the given client's config (debug only)",
'h': "display this usage information"
}
argDescriptions = {
'D': "<PID file> ",
'c': "<config file>",
'C': "<client hostname>"
}
ssetup = dgetopt(argv[1:], options, doptions,
descriptions, argDescriptions)
if not ssetup['configfile']:
ssetup['configfile'] = '/etc/bcfg2.conf'
s = Bcfg2(ssetup)
while not s.shut:
try:
s.serve_forever()
except:
critical_error("service loop")
syslog(LOG_INFO, "Shutting down")
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