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-rwxr-xr-xsource4/scripting/bin/samba_dnsupdate73
1 files changed, 70 insertions, 3 deletions
diff --git a/source4/scripting/bin/samba_dnsupdate b/source4/scripting/bin/samba_dnsupdate
index b295224ddc..4dafe79375 100755
--- a/source4/scripting/bin/samba_dnsupdate
+++ b/source4/scripting/bin/samba_dnsupdate
@@ -36,11 +36,13 @@ from samba import getopt as options
from ldb import SCOPE_BASE
from samba.auth import system_session
from samba.samdb import SamDB
+from samba.dcerpc import netlogon, winbind
samba.ensure_external_module("dns", "dnspython")
import dns.resolver as resolver
default_ttl = 900
+am_rodc = False
parser = optparse.OptionParser("samba_dnsupdate")
sambaopts = options.SambaOptions(parser)
@@ -75,7 +77,8 @@ if len(IPs) == 0:
print "No IP interfaces - skipping DNS updates"
sys.exit(0)
-
+if opts.verbose:
+ print "IPs: %s" % IPs
########################################################
# get credentials if we haven't got them already
@@ -189,19 +192,22 @@ def check_dns_name(d):
###########################################
# get the list of substitution vars
def get_subst_vars():
- global lp
+ global lp, am_rodc
vars = {}
samdb = SamDB(url=lp.get("sam database"), session_info=system_session(),
lp=lp)
vars['DNSDOMAIN'] = lp.get('realm').lower()
+ vars['DNSFOREST'] = lp.get('realm').lower()
vars['HOSTNAME'] = lp.get('netbios name').lower() + "." + vars['DNSDOMAIN']
vars['NTDSGUID'] = samdb.get_ntds_GUID()
vars['SITE'] = samdb.server_site_name()
res = samdb.search(base=None, scope=SCOPE_BASE, attrs=["objectGUID"])
guid = samdb.schema_format_value("objectGUID", res[0]['objectGUID'][0])
vars['DOMAINGUID'] = guid
+ am_rodc = samdb.am_rodc()
+
return vars
@@ -241,6 +247,64 @@ def call_nsupdate(d):
os.unlink(tmpfile)
+
+def rodc_dns_update(d, t):
+ '''a single DNS update via the RODC netlogon call'''
+ global sub_vars
+
+ if opts.verbose:
+ print "Calling netlogon RODC update for %s" % d
+
+ w = winbind.winbind("irpc:winbind_server", lp)
+ dns_names = netlogon.NL_DNS_NAME_INFO_ARRAY()
+ dns_names.count = 1
+ name = netlogon.NL_DNS_NAME_INFO()
+ name.type = t
+ name.priority = 0
+ name.weight = 0
+ if d.port is not None:
+ name.port = int(d.port)
+ name.dns_register = True
+ dns_names.names = [ name ]
+ site_name = sub_vars['SITE'].decode('utf-8')
+
+ try:
+ ret_names = w.DsrUpdateReadOnlyServerDnsRecords(site_name, default_ttl, dns_names)
+ if ret_names.names[0].status != 0:
+ print("Failed to set DNS entry: %s (status %u)" % (d, ret_names.names[0].status))
+ except:
+ print("Error setting DNS entry: %s" % d)
+
+
+def call_rodc_update(d):
+ '''RODCs need to use the netlogon API for nsupdate'''
+ global lp, sub_vars
+
+ # we expect failure for 3268 if we aren't a GC
+ if d.port is not None and int(d.port) == 3268:
+ return
+
+ # map the DNS request to a netlogon update type
+ map = {
+ netlogon.NlDnsLdapAtSite : '_ldap._tcp.${SITE}._sites.${DNSDOMAIN}',
+ netlogon.NlDnsGcAtSite : '_ldap._tcp.${SITE}._sites.gc._msdcs.${DNSDOMAIN}',
+ netlogon.NlDnsDsaCname : '${NTDSGUID}._msdcs.${DNSFOREST}',
+ netlogon.NlDnsKdcAtSite : '_kerberos._tcp.${SITE}._sites.dc._msdcs.${DNSDOMAIN}',
+ netlogon.NlDnsDcAtSite : '_ldap._tcp.${SITE}._sites.dc._msdcs.${DNSDOMAIN}',
+ netlogon.NlDnsRfc1510KdcAtSite : '_kerberos._tcp.${SITE}._sites.${DNSDOMAIN}',
+ netlogon.NlDnsGenericGcAtSite : '_gc._tcp.${SITE}._sites.${DNSFOREST}'
+ }
+
+ for t in map:
+ subname = samba.substitute_var(map[t], sub_vars)
+ if subname.lower() == d.name.lower():
+ # found a match - do the update
+ rodc_dns_update(d, t)
+ return
+ if opts.verbose:
+ print("Unable to map to netlogon DNS update: %s" % d)
+
+
# get the list of DNS entries we should have
dns_update_list = lp.private_path('dns_update_list')
@@ -286,7 +350,10 @@ get_credentials(lp)
# ask nsupdate to add entries as needed
for d in update_list:
- call_nsupdate(d)
+ if am_rodc:
+ call_rodc_update(d)
+ else:
+ call_nsupdate(d)
# delete the ccache if we created it
if ccachename is not None: