#!/usr/bin/env python3
#
# Helper for determining USN ranges created of modified by provision and
# upgradeprovision.
# Copyright (C) Matthieu Patou <mat@matws.net> 2009-2011
#
#
# 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; either version 3 of the License, or
# (at your option) any later version.
#
# 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, see <http://www.gnu.org/licenses/>.
#
import sys
import optparse
sys.path.insert(0, "bin/python")

from samba.credentials import DONT_USE_KERBEROS
from samba.auth import system_session
from samba import Ldb
import ldb
                
import samba.getopt as options
from samba import param
from samba.upgradehelpers import get_paths, print_provision_ranges, findprovisionrange
from samba.ndr import ndr_unpack
from samba.dcerpc import misc

parser = optparse.OptionParser("provision [options]")
sambaopts = options.SambaOptions(parser)
parser.add_option_group(sambaopts)
parser.add_option_group(options.VersionOptions(parser))
parser.add_option("--storedir", type="string", help="Directory where to store result files")
credopts = options.CredentialsOptions(parser)
parser.add_option_group(credopts)
opts = parser.parse_args()[0]
lp = sambaopts.get_loadparm()
smbconf = lp.configfile

creds = credopts.get_credentials(lp)
creds.set_kerberos_state(DONT_USE_KERBEROS)
session = system_session()
paths = get_paths(param, smbconf=smbconf)
basedn="DC=" + lp.get("realm").replace(".",",DC=")
samdb = Ldb(paths.samdb, session_info=session, credentials=creds,lp=lp)

res = samdb.search(base="", scope=ldb.SCOPE_BASE, attrs=["dsServiceName"])

invocation = None
if res and len(res) == 1 and res[0]["dsServiceName"] != None:
    dn = ldb.Dn(samdb, str(res[0]["dsServiceName"]))
    res = samdb.search(base=str(dn), scope=ldb.SCOPE_BASE, attrs=["invocationId"],
                        controls=["search_options:1:2"])

    if res and len(res) == 1 and res[0]["invocationId"]:
        invocation = str(ndr_unpack(misc.GUID, res[0]["invocationId"][0]))   
    else:
        print("Unable to find invocation ID")
        sys.exit(1)
else:
    print("Unable to find attribute dsServiceName in rootDSE")
    sys.exit(1)

minobj = 5
(hash_id, nb_obj) = findprovisionrange(samdb, basedn)
print("Here is a list of changes that modified more than %d objects in 1 minute." % minobj)
print("Usually changes made by provision and upgradeprovision are those who affect a couple"
      " of hundred of objects or more")
print("Total number of objects: %d\n" % nb_obj)

print_provision_ranges(hash_id, minobj, opts.storedir, str(paths.samdb), invocation)