Coverage for ipaserver/install/bindinstance : 15%

# Authors: Simo Sorce <ssorce@redhat.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, 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 tempfile 

import os 

import pwd 

import netaddr 

import re 

import installutils 

import ldap 

import service 

from ipaserver import ipaldap 

from ipaserver.install.dsinstance import realm_to_serverid 

from ipaserver.install.installutils import resolve_host 

from ipapython import sysrestore 

from ipapython import ipautil 

from ipalib.parameters import IA5Str 

from ipalib.util import (validate_zonemgr, normalize_zonemgr, 

        get_dns_forward_zone_update_policy, get_dns_reverse_zone_update_policy, 

        normalize_zone, get_reverse_zone_default, zone_is_reverse) 

from ipapython.ipa_log_manager import * 

from ipalib.text import _ 

import ipalib 

from ipalib import api, util, errors 

from ipapython.dn import DN 

NAMED_CONF = '/etc/named.conf' 

RESOLV_CONF = '/etc/resolv.conf' 

named_conf_ipa_re = re.compile(r'(?P<indent>\s*)arg\s+"(?P<name>\S+)\s(?P<value>[^"]+)";') 

named_conf_ipa_template = "%(indent)sarg \"%(name)s %(value)s\";\n" 

def check_inst(unattended): 

    has_bind = True 

    # So far this file is always present in both RHEL5 and Fedora if all the necessary 

    # bind packages are installed (RHEL5 requires also the pkg: caching-nameserver) 

    if not os.path.exists('/etc/named.rfc1912.zones'): 

        print "BIND was not found on this system" 

        print "Please install the 'bind' package and start the installation again" 

        has_bind = False 

    # Also check for the LDAP BIND plug-in 

    if not os.path.exists('/usr/lib/bind/ldap.so') and \ 

       not os.path.exists('/usr/lib64/bind/ldap.so'): 

        print "The BIND LDAP plug-in was not found on this system" 

        print "Please install the 'bind-dyndb-ldap' package and start the installation again" 

        has_bind = False 

    if not has_bind: 

        return False 

    if not unattended and os.path.exists(NAMED_CONF): 

        msg = "Existing BIND configuration detected, overwrite?" 

        return ipautil.user_input(msg, False) 

    return True 

def create_reverse(): 

    return ipautil.user_input("Do you want to configure the reverse zone?", True) 

def named_conf_exists(): 

    try: 

        named_fd = open(NAMED_CONF, 'r') 

    except IOError: 

        return False 

    lines = named_fd.readlines() 

    named_fd.close() 

    for line in lines: 

        if line.startswith('dynamic-db "ipa"'): 

            return True 

    return False 

def named_conf_get_directive(name): 

    """Get a configuration option in bind-dyndb-ldap section of named.conf""" 

    with open(NAMED_CONF, 'r') as f: 

        ipa_section = False 

        for line in f: 

            if line.startswith('dynamic-db "ipa"'): 

                ipa_section = True 

                continue 

            if line.startswith('};'): 

                if ipa_section: 

                    break 

            if ipa_section: 

                match = named_conf_ipa_re.match(line) 

                if match and name == match.group('name'): 

                    return match.group('value') 

def named_conf_set_directive(name, value): 

    """ 

    Set configuration option in bind-dyndb-ldap section of named.conf. 

    When the configuration option with given name does not exist, it 

    is added at the end of ipa section in named.conf. 

    If the value is set to None, the configuration option is removed 

    from named.conf. 

    """ 

    new_lines = [] 

    with open(NAMED_CONF, 'r') as f: 

        ipa_section = False 

        matched = False 

        last_indent = "\t" 

        for line in f: 

            if line.startswith('dynamic-db "ipa"'): 

                ipa_section = True 

            if line.startswith('};'): 

                if ipa_section and not matched: 

                    # create a new conf 

                    new_conf = named_conf_ipa_template \ 

                            % dict(indent=last_indent, 

                                   name=name, 

                                   value=value) 

                    new_lines.append(new_conf) 

                ipa_section = False 

            if ipa_section and not matched: 

                match = named_conf_ipa_re.match(line) 

                if match: 

                    last_indent = match.group('indent') 

                    if name == match.group('name'): 

                        matched = True 

                        if value is not None: 

                            if not isinstance(value, basestring): 

                                value = str(value) 

                            new_conf = named_conf_ipa_template \ 

                                    % dict(indent=last_indent, 

                                           name=name, 

                                           value=value) 

                            new_lines.append(new_conf) 

                        continue 

            new_lines.append(line) 

    # write new configuration 

    with open(NAMED_CONF, 'w') as f: 

        f.write("".join(new_lines)) 

def dns_container_exists(fqdn, suffix, dm_password=None, ldapi=False, realm=None): 

    """ 

    Test whether the dns container exists. 

    """ 

    def object_exists(dn):      # FIXME, this should be a IPAdmin/ldap2 method so it can be shared 

        """ 

        Test whether the given object exists in LDAP. 

        """ 

        assert isinstance(dn, DN) 

        try: 

            conn.search_ext_s(dn, ldap.SCOPE_BASE) 

        except ldap.NO_SUCH_OBJECT: 

            return False 

        else: 

            return True 

    assert isinstance(suffix, DN) 

    try: 

        # At install time we may need to use LDAPI to avoid chicken/egg 

        # issues with SSL certs and truting CAs 

        if ldapi: 

            conn = ipaldap.IPAdmin(host=fqdn, ldapi=True, realm=realm) 

        else: 

            conn = ipaldap.IPAdmin(host=fqdn, port=636, cacert=service.CACERT) 

        if dm_password: 

            conn.do_simple_bind(bindpw=dm_password) 

        else: 

            conn.do_sasl_gssapi_bind() 

    except ldap.SERVER_DOWN: 

        raise RuntimeError('LDAP server on %s is not responding. Is IPA installed?' % fqdn) 

    ret = object_exists(DN(('cn', 'dns'), suffix)) 

    conn.unbind_s() 

    return ret 

def dns_zone_exists(name): 

    try: 

        zone = api.Command.dnszone_show(unicode(name)) 

    except ipalib.errors.NotFound: 

        return False 

    if len(zone) == 0: 

        return False 

    else: 

        return True 

def get_reverse_record_name(zone, ip_address): 

    ip = netaddr.IPAddress(ip_address) 

    rev = '.' + normalize_zone(zone) 

    fullrev = '.' + normalize_zone(ip.reverse_dns) 

    if not fullrev.endswith(rev): 

        raise ValueError("IP address does not match reverse zone") 

    return fullrev[1:-len(rev)] 

def verify_reverse_zone(zone, ip_address): 

    try: 

        get_reverse_record_name(zone, ip_address) 

    except ValueError: 

        print "Invalid reverse zone %s" % zone 

        return False 

    return True 

def find_reverse_zone(ip_address): 

    ip = netaddr.IPAddress(ip_address) 

    zone = normalize_zone(ip.reverse_dns) 

    while len(zone) > 0: 

        if dns_zone_exists(zone): 

            return zone 

        foo, bar, zone = zone.partition('.') 

    return None 

def get_reverse_zone(ip_address): 

    return find_reverse_zone(ip_address) or get_reverse_zone_default(ip_address) 

def read_reverse_zone(default, ip_address): 

    while True: 

        zone = ipautil.user_input("Please specify the reverse zone name", default=default) 

        if not zone: 

            return None 

        if verify_reverse_zone(zone, ip_address): 

            break 

    return normalize_zone(zone) 

def add_zone(name, zonemgr=None, dns_backup=None, ns_hostname=None, ns_ip_address=None, 

       update_policy=None): 

    if zone_is_reverse(name): 

        # always normalize reverse zones 

        name = normalize_zone(name) 

    if update_policy is None: 

        if zone_is_reverse(name): 

            update_policy = get_dns_reverse_zone_update_policy(api.env.realm, name) 

        else: 

            update_policy = get_dns_forward_zone_update_policy(api.env.realm) 

    if zonemgr is None: 

        zonemgr = 'hostmaster.%s' % name 

    if ns_hostname is None: 

        # automatically retrieve list of DNS masters 

        dns_masters = api.Object.dnsrecord.get_dns_masters() 

        if not dns_masters: 

            raise installutils.ScriptError( 

                "No IPA server with DNS support found!") 

        ns_main = dns_masters.pop(0) 

        ns_replicas = dns_masters 

        addresses = resolve_host(ns_main) 

        if len(addresses) > 0: 

            # use the first address 

            ns_ip_address = addresses[0] 

        else: 

            ns_ip_address = None 

    else: 

        ns_main = ns_hostname 

        ns_replicas = [] 

    ns_main = normalize_zone(ns_main) 

    if ns_ip_address is not None: 

        ns_ip_address = unicode(ns_ip_address) 

    try: 

        api.Command.dnszone_add(unicode(name), 

                                idnssoamname=unicode(ns_main), 

                                idnssoarname=unicode(zonemgr), 

                                ip_address=ns_ip_address, 

                                idnsallowdynupdate=True, 

                                idnsupdatepolicy=unicode(update_policy), 

                                idnsallowquery=u'any', 

                                idnsallowtransfer=u'none',) 

    except (errors.DuplicateEntry, errors.EmptyModlist): 

        pass 

    nameservers = ns_replicas + [ns_main] 

    for hostname in nameservers: 

        add_ns_rr(name, hostname, dns_backup=None, force=True) 

def add_rr(zone, name, type, rdata, dns_backup=None, **kwargs): 

    addkw = { '%srecord' % str(type.lower()) : unicode(rdata) } 

    addkw.update(kwargs) 

    try: 

        api.Command.dnsrecord_add(unicode(zone), unicode(name), **addkw) 

    except (errors.DuplicateEntry, errors.EmptyModlist): 

        pass 

    if dns_backup: 

        dns_backup.add(zone, type, name, rdata) 

def add_fwd_rr(zone, host, ip_address): 

    addr = netaddr.IPAddress(ip_address) 

    if addr.version == 4: 

        add_rr(zone, host, "A", ip_address) 

    elif addr.version == 6: 

        add_rr(zone, host, "AAAA", ip_address) 

def add_ptr_rr(zone, ip_address, fqdn, dns_backup=None): 

    name = get_reverse_record_name(zone, ip_address) 

    add_rr(zone, name, "PTR", fqdn+".", dns_backup) 

def add_ns_rr(zone, hostname, dns_backup=None, force=True): 

    if not hostname.endswith('.'): 

        hostname += '.' 

    add_rr(zone, "@", "NS", hostname, dns_backup=dns_backup, 

            force=force) 

def del_rr(zone, name, type, rdata): 

    delkw = { '%srecord' % str(type.lower()) : unicode(rdata) } 

    try: 

        api.Command.dnsrecord_del(unicode(zone), unicode(name), **delkw) 

    except (errors.NotFound, errors.EmptyModlist): 

        pass 

def get_rr(zone, name, type): 

    rectype = '%srecord' % unicode(type.lower()) 

    ret = api.Command.dnsrecord_find(unicode(zone), unicode(name)) 

    if ret['count'] > 0: 

        for r in ret['result']: 

            if rectype in r: 

                return r[rectype] 

    return [] 

def zonemgr_callback(option, opt_str, value, parser): 

    """ 

    Properly validate and convert --zonemgr Option to IA5String 

    """ 

    # validate the value first 

    try: 

        validate_zonemgr(value) 

    except ValueError, e: 

        parser.error("invalid zonemgr: " + unicode(e)) 

    parser.values.zonemgr = value 

class DnsBackup(object): 

    def __init__(self, service): 

        self.service = service 

        self.zones = {} 

    def add(self, zone, record_type, host, rdata): 

        """ 

        Backup a DNS record in the file store so it can later be removed. 

        """ 

        if zone not in self.zones: 

            zone_id = len(self.zones) 

            self.zones[zone] = (zone_id, 0) 

            self.service.backup_state("dns_zone_%s" % zone_id, zone) 

        (zone_id, record_id) = self.zones[zone] 

        self.service.backup_state("dns_record_%s_%s" % (zone_id, record_id), 

                                  "%s %s %s" % (record_type, host, rdata)) 

        self.zones[zone] = (zone_id, record_id + 1) 

    def clear_records(self, have_ldap): 

        """ 

        Remove all records from the file store. If we are connected to 

        ldap, we will also remove them there. 

        """ 

        i = 0 

        while True: 

            zone = self.service.restore_state("dns_zone_%s" % i) 

            if not zone: 

                return 

            j = 0 

            while True: 

                dns_record = self.service.restore_state("dns_record_%s_%s" % (i, j)) 

                if not dns_record: 

                    break 

                if have_ldap: 

                    type, host, rdata = dns_record.split(" ", 2) 

                    try: 

                        delkw = { '%srecord' % str(type.lower()) : unicode(rdata) } 

                        api.Command.dnsrecord_del(unicode(zone), unicode(host), **delkw) 

                    except: 

                        pass 

                j += 1 

            i += 1 

class BindInstance(service.Service): 

    def __init__(self, fstore=None, dm_password=None): 

        service.Service.__init__(self, "named", dm_password=dm_password, ldapi=False, autobind=service.DISABLED) 

        self.dns_backup = DnsBackup(self) 

        self.named_user = None 

        self.domain = None 

        self.host = None 

        self.ip_address = None 

        self.realm = None 

        self.forwarders = None 

        self.sub_dict = None 

        self.reverse_zone = None 

        self.dm_password = dm_password 

        if fstore: 

            self.fstore = fstore 

        else: 

            self.fstore = sysrestore.FileStore('/var/lib/ipa/sysrestore') 

    suffix = ipautil.dn_attribute_property('_suffix') 

    def setup(self, fqdn, ip_address, realm_name, domain_name, forwarders, ntp, 

              reverse_zone, named_user="named", zonemgr=None, 

              zone_refresh=0, persistent_search=True, serial_autoincrement=True): 

        self.named_user = named_user 

        self.fqdn = fqdn 

        self.ip_address = ip_address 

        self.realm = realm_name 

        self.domain = domain_name 

        self.forwarders = forwarders 

        self.host = fqdn.split(".")[0] 

        self.suffix = ipautil.realm_to_suffix(self.realm) 

        self.ntp = ntp 

        self.reverse_zone = reverse_zone 

        self.zone_refresh = zone_refresh 

        self.persistent_search = persistent_search 

        self.serial_autoincrement = serial_autoincrement 

        if not zonemgr: 

            self.zonemgr = 'hostmaster.%s' % self.domain 

        else: 

            self.zonemgr = normalize_zonemgr(zonemgr) 

        self.__setup_sub_dict() 

    @property 

    def host_domain(self): 

        return '.'.join(self.fqdn.split(".")[1:]) 

    @property 

    def host_in_rr(self): 

        # when a host is not in a default domain, it needs to be referred 

        # with FQDN and not in a domain-relative host name 

        if not self.host_in_default_domain(): 

            return normalize_zone(self.fqdn) 

        return self.host 

    def host_in_default_domain(self): 

        return normalize_zone(self.host_domain) == normalize_zone(self.domain) 

    def create_sample_bind_zone(self): 

        bind_txt = ipautil.template_file(ipautil.SHARE_DIR + "bind.zone.db.template", self.sub_dict) 

        [bind_fd, bind_name] = tempfile.mkstemp(".db","sample.zone.") 

        os.write(bind_fd, bind_txt) 

        os.close(bind_fd) 

        print "Sample zone file for bind has been created in "+bind_name 

    def create_instance(self): 

        try: 

            self.stop() 

        except: 

            pass 

        # get a connection to the DS 

        self.ldap_connect() 

        if installutils.record_in_hosts(self.ip_address, self.fqdn) is None: 

            installutils.add_record_to_hosts(self.ip_address, self.fqdn) 

        if not dns_container_exists(self.fqdn, self.suffix, realm=self.realm, 

                                    ldapi=True, dm_password=self.dm_password): 

            self.step("adding DNS container", self.__setup_dns_container) 

        if dns_zone_exists(self.domain): 

            self.step("adding NS record to the zone", self.__add_self_ns) 

        else: 

            self.step("setting up our zone", self.__setup_zone) 

        if self.reverse_zone is not None: 

            self.step("setting up reverse zone", self.__setup_reverse_zone) 

        self.step("setting up our own record", self.__add_self) 

        self.step("setting up kerberos principal", self.__setup_principal) 

        self.step("setting up named.conf", self.__setup_named_conf) 

        self.step("restarting named", self.__start) 

        self.step("configuring named to start on boot", self.__enable) 

        self.step("changing resolv.conf to point to ourselves", self.__setup_resolv_conf) 

        self.start_creation("Configuring named:") 

    def __start(self): 

        try: 

            self.backup_state("running", self.is_running()) 

            self.restart() 

        except: 

            print "named service failed to start" 

    def __enable(self): 

        self.backup_state("enabled", self.is_running()) 

        # We do not let the system start IPA components on its own, 

        # Instead we reply on the IPA init script to start only enabled 

        # components as found in our LDAP configuration tree 

        try: 

            self.ldap_enable('DNS', self.fqdn, self.dm_password, self.suffix) 

        except errors.DuplicateEntry: 

            # service already exists (forced DNS reinstall) 

            # don't crash, just report error 

            root_logger.error("DNS service already exists") 

    def __setup_sub_dict(self): 

        if self.forwarders: 

            fwds = "\n" 

            for forwarder in self.forwarders: 

                fwds += "\t\t%s;\n" % forwarder 

            fwds += "\t" 

        else: 

            fwds = " " 

        if self.ntp: 

            optional_ntp =  "\n;ntp server\n" 

            optional_ntp += "_ntp._udp\t\tIN SRV 0 100 123\t%s" % self.host_in_rr 

        else: 

            optional_ntp = "" 

        boolean_var = {} 

        for var in ('persistent_search', 'serial_autoincrement'): 

            boolean_var[var] = "yes" if getattr(self, var, False) else "no" 

        self.sub_dict = dict(FQDN=self.fqdn, 

                             IP=self.ip_address, 

                             DOMAIN=self.domain, 

                             HOST=self.host, 

                             REALM=self.realm, 

                             SERVER_ID=realm_to_serverid(self.realm), 

                             FORWARDERS=fwds, 

                             SUFFIX=self.suffix, 

                             OPTIONAL_NTP=optional_ntp, 

                             ZONEMGR=self.zonemgr, 

                             ZONE_REFRESH=self.zone_refresh, 

                             PERSISTENT_SEARCH=boolean_var['persistent_search'], 

                             SERIAL_AUTOINCREMENT=boolean_var['serial_autoincrement'],) 

    def __setup_dns_container(self): 

        self._ldap_mod("dns.ldif", self.sub_dict) 

    def __setup_zone(self): 

        if not self.host_in_default_domain(): 

            # add DNS domain for host first 

            root_logger.debug("Host domain (%s) is different from DNS domain (%s)!" \ 

                    % (self.host_domain, self.domain)) 

            root_logger.debug("Add DNS zone for host first.") 

            add_zone(self.host_domain, self.zonemgr, dns_backup=self.dns_backup, 

                    ns_hostname=api.env.host, ns_ip_address=self.ip_address) 

        add_zone(self.domain, self.zonemgr, dns_backup=self.dns_backup, 

                ns_hostname=api.env.host, ns_ip_address=self.ip_address) 

    def __add_self_ns(self): 

        add_ns_rr(self.domain, api.env.host, self.dns_backup, force=True) 

    def __add_self(self): 

        zone = self.domain 

        resource_records = ( 

            ("_ldap._tcp", "SRV", "0 100 389 %s" % self.host_in_rr), 

            ("_kerberos", "TXT", self.realm), 

            ("_kerberos._tcp", "SRV", "0 100 88 %s" % self.host_in_rr), 

            ("_kerberos._udp", "SRV", "0 100 88 %s" % self.host_in_rr), 

            ("_kerberos-master._tcp", "SRV", "0 100 88 %s" % self.host_in_rr), 

            ("_kerberos-master._udp", "SRV", "0 100 88 %s" % self.host_in_rr), 

            ("_kpasswd._tcp", "SRV", "0 100 464 %s" % self.host_in_rr), 

            ("_kpasswd._udp", "SRV", "0 100 464 %s" % self.host_in_rr), 

        ) 

        for (host, type, rdata) in resource_records: 

            if type == "SRV": 

                add_rr(zone, host, type, rdata, self.dns_backup) 

            else: 

                add_rr(zone, host, type, rdata) 

        if self.ntp: 

            add_rr(zone, "_ntp._udp", "SRV", "0 100 123 %s" % self.host_in_rr) 

        # Add forward and reverse records to self 

        add_fwd_rr(self.host_domain, self.host, self.ip_address) 

        if self.reverse_zone is not None and dns_zone_exists(self.reverse_zone): 

            add_ptr_rr(self.reverse_zone, self.ip_address, self.fqdn) 

    def __setup_reverse_zone(self): 

        add_zone(self.reverse_zone, self.zonemgr, ns_hostname=api.env.host, 

                ns_ip_address=self.ip_address, dns_backup=self.dns_backup) 

    def __setup_principal(self): 

        dns_principal = "DNS/" + self.fqdn + "@" + self.realm 

        installutils.kadmin_addprinc(dns_principal) 

        # Store the keytab on disk 

        self.fstore.backup_file("/etc/named.keytab") 

        installutils.create_keytab("/etc/named.keytab", dns_principal) 

        p = self.move_service(dns_principal) 

        if p is None: 

            # the service has already been moved, perhaps we're doing a DNS reinstall 

            dns_principal = DN(('krbprincipalname', dns_principal), 

                               ('cn', 'services'), ('cn', 'accounts'), self.suffix) 

        else: 

            dns_principal = p 

        # Make sure access is strictly reserved to the named user 

        pent = pwd.getpwnam(self.named_user) 

        os.chown("/etc/named.keytab", pent.pw_uid, pent.pw_gid) 

        os.chmod("/etc/named.keytab", 0400) 

        # modify the principal so that it is marked as an ipa service so that 

        # it can host the memberof attribute, then also add it to the 

        # dnsserver role group, this way the DNS is allowed to perform 

        # DNS Updates 

        dns_group = DN(('cn', 'DNS Servers'), ('cn', 'privileges'), ('cn', 'pbac'), self.suffix) 

        mod = [(ldap.MOD_ADD, 'member', dns_principal)] 

        try: 

            self.admin_conn.modify_s(dns_group, mod) 

        except ldap.TYPE_OR_VALUE_EXISTS: 

            pass 

        except Exception, e: 

            root_logger.critical("Could not modify principal's %s entry: %s" \ 

                    % (dns_principal, str(e))) 

            raise 

        # bind-dyndb-ldap persistent search feature requires both size and time 

        # limit-free connection 

        mod = [(ldap.MOD_REPLACE, 'nsTimeLimit', '-1'), 

               (ldap.MOD_REPLACE, 'nsSizeLimit', '-1'), 

               (ldap.MOD_REPLACE, 'nsIdleTimeout', '-1'), 

               (ldap.MOD_REPLACE, 'nsLookThroughLimit', '-1')] 

        try: 

            self.admin_conn.modify_s(dns_principal, mod) 

        except Exception, e: 

            root_logger.critical("Could not set principal's %s LDAP limits: %s" \ 

                    % (dns_principal, str(e))) 

            raise 

    def __setup_named_conf(self): 

        self.fstore.backup_file(NAMED_CONF) 

        named_txt = ipautil.template_file(ipautil.SHARE_DIR + "bind.named.conf.template", self.sub_dict) 

        named_fd = open(NAMED_CONF, 'w') 

        named_fd.seek(0) 

        named_fd.truncate(0) 

        named_fd.write(named_txt) 

        named_fd.close() 

    def __setup_resolv_conf(self): 

        self.fstore.backup_file(RESOLV_CONF) 

        resolv_txt = "search "+self.domain+"\nnameserver "+self.ip_address+"\n" 

        resolv_fd = open(RESOLV_CONF, 'w') 

        resolv_fd.seek(0) 

        resolv_fd.truncate(0) 

        resolv_fd.write(resolv_txt) 

        resolv_fd.close() 

    def add_master_dns_records(self, fqdn, ip_address, realm_name, domain_name, 

                               reverse_zone, ntp=False): 

        self.fqdn = fqdn 

        self.ip_address = ip_address 

        self.realm = realm_name 

        self.domain = domain_name 

        self.host = fqdn.split(".")[0] 

        self.suffix = ipautil.realm_to_suffix(self.realm) 

        self.ntp = ntp 

        self.reverse_zone = reverse_zone 

        self.__add_self() 

    def remove_master_dns_records(self, fqdn, realm_name, domain_name): 

        host = fqdn.split(".")[0] 

        suffix = ipautil.realm_to_suffix(realm_name) 

        zone = domain_name 

        resource_records = ( 

            ("_ldap._tcp", "SRV", "0 100 389 %s" % host), 

            ("_kerberos._tcp", "SRV", "0 100 88 %s" % host), 

            ("_kerberos._udp", "SRV", "0 100 88 %s" % host), 

            ("_kerberos-master._tcp", "SRV", "0 100 88 %s" % host), 

            ("_kerberos-master._udp", "SRV", "0 100 88 %s" % host), 

            ("_kpasswd._tcp", "SRV", "0 100 464 %s" % host), 

            ("_kpasswd._udp", "SRV", "0 100 464 %s" % host), 

            ("_ntp._udp", "SRV", "0 100 123 %s" % host), 

            ("@", "NS", fqdn+"."), 

        ) 

        for (record, type, rdata) in resource_records: 

            del_rr(zone, record, type, rdata) 

        areclist = [("A", x) for x in get_rr(zone, host, "A")] + [("AAAA", x) for x in get_rr(zone, host, "AAAA")] 

        for (type, rdata) in areclist: 

            del_rr(zone, host, type, rdata) 

            rzone = find_reverse_zone(rdata) 

            if rzone is not None: 

                record = get_reverse_record_name(rzone, rdata) 

                del_rr(rzone, record, "PTR", fqdn+".") 

                # remove also master NS record from the reverse zone 

                del_rr(rzone, "@", "NS", fqdn+".") 

    def check_global_configuration(self): 

        """ 

        Check global DNS configuration in LDAP server and inform user when it 

        set and thus overrides his configured options in named.conf. 

        """ 

        result = api.Command.dnsconfig_show() 

        global_conf_set = any(param in result['result'] for \ 

                              param in api.Object['dnsconfig'].params) 

        if not global_conf_set: 

            print "Global DNS configuration in LDAP server is empty" 

            print "You can use 'dnsconfig-mod' command to set global DNS options that" 

            print "would override settings in local named.conf files" 

            return 

        print "Global DNS configuration in LDAP server is not empty" 

        print "The following configuration options override local settings in named.conf:" 

        print "" 

        textui = ipalib.cli.textui() 

        api.Command.dnsconfig_show.output_for_cli(textui, result, None, reverse=False) 

    def uninstall(self): 

        if self.is_configured(): 

            self.print_msg("Unconfiguring %s" % self.service_name) 

        running = self.restore_state("running") 

        enabled = self.restore_state("enabled") 

        self.dns_backup.clear_records(api.Backend.ldap2.isconnected()) 

        if not running is None: 

            self.stop() 

        for f in [NAMED_CONF, RESOLV_CONF]: 

            try: 

                self.fstore.restore_file(f) 

            except ValueError, error: 

                root_logger.debug(error) 

                pass 

        if not enabled is None and not enabled: 

            self.disable() 

        if not running is None and running: 

            self.start()