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#! /usr/bin/python -E
# Authors: Karl MacMillan <kmacmillan@mentalrootkit.com>
#
# Copyright (C) 2007  Red Hat
# see file 'COPYING' for use and warranty information
#
# 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; version 2 only
#
# 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, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
import sys

import getpass, ldap, re, krbV
import traceback, logging

from ipapython import ipautil
from ipaserver.install import replication, dsinstance, installutils
from ipaserver import ipaldap
from ipapython import version
from ipalib import util
from ipalib import errors

def parse_options():
    from optparse import OptionParser

    parser = OptionParser(version=version.VERSION)
    parser.add_option("-H", "--host", dest="host", help="starting host")
    parser.add_option("-p", "--password", dest="dirman_passwd", help="Directory Manager password")
    parser.add_option("-v", "--verbose", dest="verbose", action="store_true", default=False,
                      help="provide additional information")
    parser.add_option("-f", "--force", dest="force", action="store_true", default=False,
                      help="ignore some types of errors")
    parser.add_option("--port", type="int", dest="port",
                      help="port number of other server")
    parser.add_option("--binddn", dest="binddn",
                      help="Bind DN to use with remote server")
    parser.add_option("--bindpw", dest="bindpw",
                      help="Password for Bind DN to use with remote server")
    parser.add_option("--winsync", dest="winsync", action="store_true", default=False,
                      help="This is a Windows Sync Agreement")
    parser.add_option("--cacert", dest="cacert",
                      help="Full path and filename of CA certificate to use with TLS/SSL to the remote server")
    parser.add_option("--win-subtree", dest="win_subtree",
                      help="DN of Windows subtree containing the users you want to sync (default cn=Users,<domain suffix)")
    parser.add_option("--passsync", dest="passsync",
                      help="Password for the Windows PassSync user")

    options, args = parser.parse_args()

    if not len(args) or not ("list" in args[0] or "add" in args[0] or "del" in args[0] or "init" in args[0] or "synch" in args[0]):
        parser.error("must provide a command [list | add | del | init | synch]")

    # set log level
    if options.verbose:
        # if verbose, output events at INFO level if not already
        mylogger = logging.getLogger()
        if mylogger.getEffectiveLevel() > logging.INFO:
            mylogger.setLevel(logging.INFO)
        # else user has already configured logging externally lower
    return options, args

def get_realm_name():
    c = krbV.default_context()
    return c.default_realm

def get_suffix():
    suffix = ipaldap.IPAdmin.normalizeDN(util.realm_to_suffix(get_realm_name()))
    return suffix

def get_host_name():
    hostname = installutils.get_fqdn()
    try:
        installutils.verify_fqdn(hostname)
    except RuntimeError, e:
        logging.error(str(e))
        sys.exit(1)

    return hostname

def list_masters(replman, verbose):
    dns = replman.find_replication_dns(replman.conn)

    for dn in dns:
        entry = replman.conn.search_s(dn, ldap.SCOPE_SUBTREE)[0]
        print entry.getValue('nsds5replicahost')

        if verbose:
            print "  last init status: %s" % entry.nsds5replicalastinitstatus
            print "  last init ended: %s" % str(ipautil.parse_generalized_time(entry.nsds5replicalastinitend))
            print "  last update status: %s" % entry.nsds5replicalastupdatestatus
            print "  last update ended: %s" % str(ipautil.parse_generalized_time(entry.nsds5replicalastupdateend))
    
def del_master(replman, hostname, force=False):
    try:
        t = replman.get_agreement_type(hostname)
    except ldap.NO_SUCH_OBJECT:
        print "No replication agreement found for '%s'" % hostname
        return
    except errors.NotFound:
        print "No replication agreement found for '%s'" % hostname
        return

    if t == replication.IPA_REPLICA:
        try:
            other_replman = replication.ReplicationManager(hostname, dirman_passwd=None)
            other_replman.suffix = get_suffix()
            other_replman.delete_agreement(replman.conn.host)
        except Exception, e:
            if force:
                print "Unable to remove agreement on %s: %s" % (hostname, str(e))
            else:
                raise e

    replman.delete_agreement(hostname)

def add_master(replman, hostname, options):
    other_args = {}
    if options.port:
        other_args['port'] = options.port
    if options.binddn:
        other_args['binddn'] = options.binddn
    if options.bindpw:
        other_args['bindpw'] = options.bindpw
    if options.cacert:
        other_args['cacert'] = options.cacert
    if options.win_subtree:
        other_args['win_subtree'] = options.win_subtree
    if options.passsync:
        other_args['passsync'] = options.passsync
    if options.winsync:
        other_args['winsync'] = True
        if not options.binddn or not options.bindpw or not options.cacert or not options.passsync:
            logging.error("The arguments --binddn, --bindpw, --passsync and --cacert are required to create a winsync agreement")
            sys.exit(1)
    if options.cacert:
        # have to install the given CA cert before doing anything else
        ds = dsinstance.DsInstance(realm_name = get_realm_name(),
                                   dm_password = replman.dirman_passwd)
        if not ds.add_ca_cert(options.cacert):
            logging.error("Could not load the required CA certificate file [%s]" %
                          options.cacert)
            sys.exit(1)
        else:
            logging.info("Added CA certificate %s to certificate database for %s" %
                         (options.cacert, replman.hostname))
        # have to reconnect replman connection since the directory server was restarted
        replman = replication.ReplicationManager(replman.hostname, replman.dirman_passwd)
        logging.info("Restarted directory server " + replman.hostname)
    replman.setup_replication(hostname, get_realm_name(), **other_args)
    logging.info("Added agreement for other host " + hostname)

def init_master(replman, dirman_passwd, hostname):
    filter = "(&(nsDS5ReplicaHost=%s)(|(objectclass=nsDSWindowsReplicationAgreement)(objectclass=nsds5ReplicationAgreement)))" % hostname
    entry = replman.conn.search_s("cn=config", ldap.SCOPE_SUBTREE, filter)
    if len(entry) == 0:
        logging.error("Unable to find replication agreement for %s" % hostname)
        sys.exit(1)
    if len(entry) > 1:
        logging.error("Found multiple agreements for %s. Only initializing the first one returned: %s" % (hostname, entry[0].dn))
    replman.initialize_replication(entry[0].dn, replman.conn)
    ds = dsinstance.DsInstance(realm_name = get_realm_name(), dm_password = dirman_passwd)
    ds.init_memberof()

def synch_master(replman, hostname):
    filter = "(&(nsDS5ReplicaHost=%s)(|(objectclass=nsDSWindowsReplicationAgreement)(objectclass=nsds5ReplicationAgreement)))" % hostname
    entry = replman.conn.search_s("cn=config", ldap.SCOPE_SUBTREE, filter)
    if len(entry) == 0:
        logging.error("Unable to find replication agreement for %s" % hostname)
        sys.exit(1)
    if len(entry) > 1:
        logging.error("Found multiple agreements for %s. Only initializing the first one returned: %s" % (hostname, entry[0].dn))
    replman.force_synch(entry[0].dn, entry[0].nsds5replicaupdateschedule, replman.conn)

def main():
    options, args = parse_options()
    
    dirman_passwd = None

    if options.dirman_passwd:
        dirman_passwd = options.dirman_passwd
    else:
        if args[0] in ["add", "init"]:
            dirman_passwd = getpass.getpass("Directory Manager password: ")

    if options.host:
        host = options.host
    else:
        host = get_host_name()

    r = replication.ReplicationManager(host, dirman_passwd)
    r.suffix = get_suffix()

    if args[0] == "list":
        list_masters(r, options.verbose)
    elif args[0] == "del":
        if len(args) != 2:
            print "must provide hostname of master to delete"
            sys.exit(1)
        del_master(r, args[1], options.force)
    elif args[0] == "add":
        if len(args) != 2:
            print "must provide hostname of master to add"
            sys.exit(1)
        add_master(r, args[1], options)
    elif args[0] == "init":
        if len(args) != 2:
            print "hostname of master to initialize is required."
            sys.exit(1)
        init_master(r, dirman_passwd, args[1])
    elif args[0] == "synch":
        if len(args) != 2:
            print "must provide hostname of supplier to synchronize with"
            sys.exit(1)
        synch_master(r, args[1])
    else:
        print "unknown command: %s" % args[0]
        sys.exit(1)

try:
    main()
except KeyboardInterrupt:
    sys.exit(1)   
except SystemExit, e:
    sys.exit(e)
except ldap.INVALID_CREDENTIALS:
    print "Invalid password"
    sys.exit(1)
except ldap.INSUFFICIENT_ACCESS:
    print "Insufficient access"
    sys.exit(1)
except ldap.LOCAL_ERROR, e:
    print e.args[0]['info']
    sys.exit(1)
except Exception, e:
    print "unexpected error: %s" % str(e)
    sys.exit(1)