source4/scripting/bin/samba_dnsupdate

   1 #!/usr/bin/env python
   2 # vim: expandtab
   3 #
   4 # update our DNS names using TSIG-GSS
   5 #
   6 # Copyright (C) Andrew Tridgell 2010
   7 #
   8 # This program is free software; you can redistribute it and/or modify
   9 # it under the terms of the GNU General Public License as published by
  10 # the Free Software Foundation; either version 3 of the License, or
  11 # (at your option) any later version.
  12 #
  13 # This program is distributed in the hope that it will be useful,
  14 # but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 # GNU General Public License for more details.
  17 #
  18 # You should have received a copy of the GNU General Public License
  19 # along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20
  21
  22 import os
  23 import fcntl
  24 import sys
  25 import tempfile
  26 import subprocess
  27
  28 # ensure we get messages out immediately, so they get in the samba logs,
  29 # and don't get swallowed by a timeout
  30 os.environ['PYTHONUNBUFFERED'] = '1'
  31
  32 # forcing GMT avoids a problem in some timezones with kerberos. Both MIT
  33 # heimdal can get mutual authentication errors due to the 24 second difference
  34 # between UTC and GMT when using some zone files (eg. the PDT zone from
  35 # the US)
  36 os.environ["TZ"] = "GMT"
  37
  38 # Find right directory when running from source tree
  39 sys.path.insert(0, "bin/python")
  40
  41 import samba
  42 import optparse
  43 from samba import getopt as options
  44 from ldb import SCOPE_BASE
  45 from samba import dsdb
  46 from samba.auth import system_session
  47 from samba.samdb import SamDB
  48 from samba.dcerpc import netlogon, winbind
  49 from samba.netcmd.dns import cmd_dns
  50 from samba import gensec
  51
  52 samba.ensure_third_party_module("dns", "dnspython")
  53 import dns.resolver
  54 import dns.exception
  55
  56 default_ttl = 900
  57 am_rodc = False
  58 error_count = 0
  59
  60 parser = optparse.OptionParser("samba_dnsupdate")
  61 sambaopts = options.SambaOptions(parser)
  62 parser.add_option_group(sambaopts)
  63 parser.add_option_group(options.VersionOptions(parser))
  64 parser.add_option("--verbose", action="store_true")
  65 parser.add_option("--use-samba-tool", action="store_true", help="Use samba-tool to make updates over RPC, rather than over DNS")
  66 parser.add_option("--use-nsupdate", action="store_true", help="Use nsupdate command to make updates over DNS (default, if kinit successful)")
  67 parser.add_option("--all-names", action="store_true")
  68 parser.add_option("--all-interfaces", action="store_true")
  69 parser.add_option("--current-ip", action="append", help="IP address to update DNS to match (helpful if behind NAT, valid multiple times, defaults to values from interfaces=)")
  70 parser.add_option("--rpc-server-ip", type="string", help="IP address of server to use with samba-tool (defaults to first --current-ip)")
  71 parser.add_option("--use-file", type="string", help="Use a file, rather than real DNS calls")
  72 parser.add_option("--update-list", type="string", help="Add DNS names from the given file")
  73 parser.add_option("--update-cache", type="string", help="Cache database of already registered records")
  74 parser.add_option("--fail-immediately", action='store_true', help="Exit on first failure")
  75 parser.add_option("--no-credentials", dest='nocreds', action='store_true', help="don't try and get credentials")
  76 parser.add_option("--no-substitutions", dest='nosubs', action='store_true', help="don't try and expands variables in file specified by --update-list")
  77
  78 creds = None
  79 ccachename = None
  80
  81 opts, args = parser.parse_args()
  82
  83 if len(args) != 0:
  84     parser.print_usage()
  85     sys.exit(1)
  86
  87 lp = sambaopts.get_loadparm()
  88
  89 domain = lp.get("realm")
  90 host = lp.get("netbios name")
  91 if opts.all_interfaces:
  92     all_interfaces = True
  93 else:
  94     all_interfaces = False
  95
  96 if opts.current_ip:
  97     IPs = opts.current_ip
  98 else:
  99     IPs = samba.interface_ips(lp, all_interfaces)
 100
 101 nsupdate_cmd = lp.get('nsupdate command')
 102
 103 if len(IPs) == 0:
 104     print "No IP interfaces - skipping DNS updates"
 105     sys.exit(0)
 106
 107 if opts.rpc_server_ip:
 108     rpc_server_ip = opts.rpc_server_ip
 109 else:
 110     rpc_server_ip = IPs[0]
 111
 112 IP6s = []
 113 IP4s = []
 114 for i in IPs:
 115     if i.find(':') != -1:
 116         IP6s.append(i)
 117     else:
 118         IP4s.append(i)
 119
 120
 121 if opts.verbose:
 122     print "IPs: %s" % IPs
 123
 124
 125 def get_credentials(lp):
 126     """# get credentials if we haven't got them already."""
 127     from samba import credentials
 128     global ccachename
 129     creds = credentials.Credentials()
 130     creds.guess(lp)
 131     creds.set_machine_account(lp)
 132     creds.set_krb_forwardable(credentials.NO_KRB_FORWARDABLE)
 133     (tmp_fd, ccachename) = tempfile.mkstemp()
 134     try:
 135         creds.get_named_ccache(lp, ccachename)
 136
 137         if opts.use_file is not None:
 138             return
 139
 140         # Now confirm we can get a ticket to a DNS server
 141         ans = check_one_dns_name(sub_vars['DNSDOMAIN'] + '.', 'NS')
 142         for i in range(len(ans)):
 143             target_hostname = str(ans[i].target).rstrip('.')
 144             settings = {}
 145             settings["lp_ctx"] = lp
 146             settings["target_hostname"] = target_hostname
 147
 148             gensec_client = gensec.Security.start_client(settings)
 149             gensec_client.set_credentials(creds)
 150             gensec_client.set_target_service("DNS")
 151             gensec_client.set_target_hostname(target_hostname)
 152             gensec_client.want_feature(gensec.FEATURE_SEAL)
 153             gensec_client.start_mech_by_sasl_name("GSSAPI")
 154             server_to_client = ""
 155             try:
 156                 (client_finished, client_to_server) = gensec_client.update(server_to_client)
 157                 if opts.verbose:
 158                     print "Successfully obtained Kerberos ticket to DNS/%s as %s" \
 159                             % (target_hostname, creds.get_username())
 160                 return
 161             except RuntimeError:
 162                 # Only raise an exception if they all failed
 163                 if i != len(ans) - 1:
 164                     pass
 165                 raise
 166
 167     except RuntimeError as e:
 168         os.unlink(ccachename)
 169         raise e
 170
 171
 172 class dnsobj(object):
 173     """an object to hold a parsed DNS line"""
 174
 175     def __init__(self, string_form):
 176         list = string_form.split()
 177         if len(list) < 3:
 178             raise Exception("Invalid DNS entry %r" % string_form)
 179         self.dest = None
 180         self.port = None
 181         self.ip = None
 182         self.existing_port = None
 183         self.existing_weight = None
 184         self.existing_cname_target = None
 185         self.rpc = False
 186         self.zone = None
 187         if list[0] == "RPC":
 188             self.rpc = True
 189             self.zone = list[1]
 190             list = list[2:]
 191         self.type = list[0]
 192         self.name = list[1]
 193         self.nameservers = []
 194         if self.type == 'SRV':
 195             if len(list) < 4:
 196                 raise Exception("Invalid DNS entry %r" % string_form)
 197             self.dest = list[2]
 198             self.port = list[3]
 199         elif self.type in ['A', 'AAAA']:
 200             self.ip   = list[2] # usually $IP, which gets replaced
 201         elif self.type == 'CNAME':
 202             self.dest = list[2]
 203         elif self.type == 'NS':
 204             self.dest = list[2]
 205         else:
 206             raise Exception("Received unexpected DNS reply of type %s: %s" % (self.type, string_form))
 207
 208     def __str__(self):
 209         if self.type == "A":
 210             return "%s %s %s" % (self.type, self.name, self.ip)
 211         if self.type == "AAAA":
 212             return "%s %s %s" % (self.type, self.name, self.ip)
 213         if self.type == "SRV":
 214             return "%s %s %s %s" % (self.type, self.name, self.dest, self.port)
 215         if self.type == "CNAME":
 216             return "%s %s %s" % (self.type, self.name, self.dest)
 217         if self.type == "NS":
 218             return "%s %s %s" % (self.type, self.name, self.dest)
 219
 220
 221 def parse_dns_line(line, sub_vars):
 222     """parse a DNS line from."""
 223     if line.startswith("SRV _ldap._tcp.pdc._msdcs.") and not samdb.am_pdc():
 224         # We keep this as compat to the dns_update_list of 4.0/4.1
 225         if opts.verbose:
 226             print "Skipping PDC entry (%s) as we are not a PDC" % line
 227         return None
 228     subline = samba.substitute_var(line, sub_vars)
 229     if subline == '' or subline[0] == "#":
 230         return None
 231     return dnsobj(subline)
 232
 233
 234 def hostname_match(h1, h2):
 235     """see if two hostnames match."""
 236     h1 = str(h1)
 237     h2 = str(h2)
 238     return h1.lower().rstrip('.') == h2.lower().rstrip('.')
 239
 240 def check_one_dns_name(name, name_type, d=None):
 241     resolv_conf = os.getenv('RESOLV_CONF')
 242     if not resolv_conf:
 243         resolv_conf = '/etc/resolv.conf'
 244     resolver = dns.resolver.Resolver(filename=resolv_conf, configure=True)
 245
 246     if d is not None and d.nameservers != []:
 247         resolver.nameservers = d.nameservers
 248     elif d is not None:
 249         d.nameservers = resolver.nameservers
 250
 251     ans = resolver.query(name, name_type)
 252     return ans
 253
 254 def check_dns_name(d):
 255     """check that a DNS entry exists."""
 256     normalised_name = d.name.rstrip('.') + '.'
 257     if opts.verbose:
 258         print "Looking for DNS entry %s as %s" % (d, normalised_name)
 259
 260     if opts.use_file is not None:
 261         try:
 262             dns_file = open(opts.use_file, "r")
 263         except IOError:
 264             return False
 265
 266         for line in dns_file:
 267             line = line.strip()
 268             if line == '' or line[0] == "#":
 269                 continue
 270             if line.lower() == str(d).lower():
 271                 return True
 272         return False
 273
 274     try:
 275         ans = check_one_dns_name(normalised_name, d.type, d)
 276     except dns.exception.Timeout:
 277         raise Exception("Timeout while waiting to contact a working DNS server while looking for %s as %s" % (d, normalised_name))
 278     except dns.resolver.NoNameservers:
 279         raise Exception("Unable to contact a working DNS server while looking for %s as %s" % (d, normalised_name))
 280     except dns.resolver.NXDOMAIN:
 281         if opts.verbose:
 282             print "The DNS entry %s, queried as %s does not exist" % (d, normalised_name)
 283         return False
 284     except dns.resolver.NoAnswer:
 285         if opts.verbose:
 286             print "The DNS entry %s, queried as %s does not hold this record type" % (d, normalised_name)
 287         return False
 288     except dns.exception.DNSException:
 289         raise Exception("Failure while trying to resolve %s as %s" % (d, normalised_name))
 290     if d.type in ['A', 'AAAA']:
 291         # we need to be sure that our IP is there
 292         for rdata in ans:
 293             if str(rdata) == str(d.ip):
 294                 return True
 295     elif d.type == 'CNAME':
 296         for i in range(len(ans)):
 297             if hostname_match(ans[i].target, d.dest):
 298                 return True
 299             else:
 300                 d.existing_cname_target = str(ans[i].target)
 301     elif d.type == 'NS':
 302         for i in range(len(ans)):
 303             if hostname_match(ans[i].target, d.dest):
 304                 return True
 305     elif d.type == 'SRV':
 306         for rdata in ans:
 307             if opts.verbose:
 308                 print "Checking %s against %s" % (rdata, d)
 309             if hostname_match(rdata.target, d.dest):
 310                 if str(rdata.port) == str(d.port):
 311                     return True
 312                 else:
 313                     d.existing_port     = str(rdata.port)
 314                     d.existing_weight = str(rdata.weight)
 315
 316     if opts.verbose:
 317         print "Lookup of %s succeeded, but we failed to find a matching DNS entry for %s" % (normalised_name, d)
 318
 319     return False
 320
 321
 322 def get_subst_vars(samdb):
 323     """get the list of substitution vars."""
 324     global lp, am_rodc
 325     vars = {}
 326
 327     vars['DNSDOMAIN'] = samdb.domain_dns_name()
 328     vars['DNSFOREST'] = samdb.forest_dns_name()
 329     vars['HOSTNAME']  = samdb.host_dns_name()
 330     vars['NTDSGUID']  = samdb.get_ntds_GUID()
 331     vars['SITE']      = samdb.server_site_name()
 332     res = samdb.search(base=samdb.get_default_basedn(), scope=SCOPE_BASE, attrs=["objectGUID"])
 333     guid = samdb.schema_format_value("objectGUID", res[0]['objectGUID'][0])
 334     vars['DOMAINGUID'] = guid
 335
 336     vars['IF_DC'] = ""
 337     vars['IF_RWDC'] = "# "
 338     vars['IF_RODC'] = "# "
 339     vars['IF_PDC'] = "# "
 340     vars['IF_GC'] = "# "
 341     vars['IF_RWGC'] = "# "
 342     vars['IF_ROGC'] = "# "
 343     vars['IF_DNS_DOMAIN'] = "# "
 344     vars['IF_RWDNS_DOMAIN'] = "# "
 345     vars['IF_RODNS_DOMAIN'] = "# "
 346     vars['IF_DNS_FOREST'] = "# "
 347     vars['IF_RWDNS_FOREST'] = "# "
 348     vars['IF_R0DNS_FOREST'] = "# "
 349
 350     am_rodc = samdb.am_rodc()
 351     if am_rodc:
 352         vars['IF_RODC'] = ""
 353     else:
 354         vars['IF_RWDC'] = ""
 355
 356     if samdb.am_pdc():
 357         vars['IF_PDC'] = ""
 358
 359     # check if we "are DNS server"
 360     res = samdb.search(base=samdb.get_config_basedn(),
 361                    expression='(objectguid=%s)' % vars['NTDSGUID'],
 362                    attrs=["options", "msDS-hasMasterNCs"])
 363
 364     if len(res) == 1:
 365         if "options" in res[0]:
 366             options = int(res[0]["options"][0])
 367             if (options & dsdb.DS_NTDSDSA_OPT_IS_GC) != 0:
 368                 vars['IF_GC'] = ""
 369                 if am_rodc:
 370                     vars['IF_ROGC'] = ""
 371                 else:
 372                     vars['IF_RWGC'] = ""
 373
 374         basedn = str(samdb.get_default_basedn())
 375         forestdn = str(samdb.get_root_basedn())
 376
 377         if "msDS-hasMasterNCs" in res[0]:
 378             for e in res[0]["msDS-hasMasterNCs"]:
 379                 if str(e) == "DC=DomainDnsZones,%s" % basedn:
 380                     vars['IF_DNS_DOMAIN'] = ""
 381                     if am_rodc:
 382                         vars['IF_RODNS_DOMAIN'] = ""
 383                     else:
 384                         vars['IF_RWDNS_DOMAIN'] = ""
 385                 if str(e) == "DC=ForestDnsZones,%s" % forestdn:
 386                     vars['IF_DNS_FOREST'] = ""
 387                     if am_rodc:
 388                         vars['IF_RODNS_FOREST'] = ""
 389                     else:
 390                         vars['IF_RWDNS_FOREST'] = ""
 391
 392     return vars
 393
 394
 395 def call_nsupdate(d, op="add"):
 396     """call nsupdate for an entry."""
 397     global ccachename, nsupdate_cmd, krb5conf
 398
 399     assert(op in ["add", "delete"])
 400
 401     if opts.verbose:
 402         print "Calling nsupdate for %s (%s)" % (d, op)
 403
 404     if opts.use_file is not None:
 405         try:
 406             rfile = open(opts.use_file, 'r+')
 407         except IOError:
 408             # Perhaps create it
 409             rfile = open(opts.use_file, 'w+')
 410             # Open it for reading again, in case someone else got to it first
 411             rfile = open(opts.use_file, 'r+')
 412         fcntl.lockf(rfile, fcntl.LOCK_EX)
 413         (file_dir, file_name) = os.path.split(opts.use_file)
 414         (tmp_fd, tmpfile) = tempfile.mkstemp(dir=file_dir, prefix=file_name, suffix="XXXXXX")
 415         wfile = os.fdopen(tmp_fd, 'a')
 416         rfile.seek(0)
 417         for line in rfile:
 418             if op == "delete":
 419                 l = parse_dns_line(line, {})
 420                 if str(l).lower() == str(d).lower():
 421                     continue
 422             wfile.write(line)
 423         if op == "add":
 424             wfile.write(str(d)+"\n")
 425         os.rename(tmpfile, opts.use_file)
 426         fcntl.lockf(rfile, fcntl.LOCK_UN)
 427         return
 428
 429     normalised_name = d.name.rstrip('.') + '.'
 430
 431     (tmp_fd, tmpfile) = tempfile.mkstemp()
 432     f = os.fdopen(tmp_fd, 'w')
 433     if d.nameservers != []:
 434         f.write('server %s\n' % d.nameservers[0])
 435     if d.type == "A":
 436         f.write("update %s %s %u A %s\n" % (op, normalised_name, default_ttl, d.ip))
 437     if d.type == "AAAA":
 438         f.write("update %s %s %u AAAA %s\n" % (op, normalised_name, default_ttl, d.ip))
 439     if d.type == "SRV":
 440         if op == "add" and d.existing_port is not None:
 441             f.write("update delete %s SRV 0 %s %s %s\n" % (normalised_name, d.existing_weight,
 442                                                            d.existing_port, d.dest))
 443         f.write("update %s %s %u SRV 0 100 %s %s\n" % (op, normalised_name, default_ttl, d.port, d.dest))
 444     if d.type == "CNAME":
 445         f.write("update %s %s %u CNAME %s\n" % (op, normalised_name, default_ttl, d.dest))
 446     if d.type == "NS":
 447         f.write("update %s %s %u NS %s\n" % (op, normalised_name, default_ttl, d.dest))
 448     if opts.verbose:
 449         f.write("show\n")
 450     f.write("send\n")
 451     f.close()
 452
 453     # Set a bigger MTU size to work around a bug in nsupdate's doio_send()
 454     os.environ["SOCKET_WRAPPER_MTU"] = "2000"
 455
 456     global error_count
 457     if ccachename:
 458         os.environ["KRB5CCNAME"] = ccachename
 459     try:
 460         cmd = nsupdate_cmd[:]
 461         cmd.append(tmpfile)
 462         env = os.environ
 463         if krb5conf:
 464             env["KRB5_CONFIG"] = krb5conf
 465         if ccachename:
 466             env["KRB5CCNAME"] = ccachename
 467         ret = subprocess.call(cmd, shell=False, env=env)
 468         if ret != 0:
 469             if opts.fail_immediately:
 470                 if opts.verbose:
 471                     print("Failed update with %s" % tmpfile)
 472                 sys.exit(1)
 473             error_count = error_count + 1
 474             if opts.verbose:
 475                 print("Failed nsupdate: %d" % ret)
 476     except Exception, estr:
 477         if opts.fail_immediately:
 478             sys.exit(1)
 479         error_count = error_count + 1
 480         if opts.verbose:
 481             print("Failed nsupdate: %s : %s" % (str(d), estr))
 482     os.unlink(tmpfile)
 483
 484     # Let socket_wrapper set the default MTU size
 485     os.environ["SOCKET_WRAPPER_MTU"] = "0"
 486
 487
 488 def call_samba_tool(d, op="add", zone=None):
 489     """call samba-tool dns to update an entry."""
 490
 491     assert(op in ["add", "delete"])
 492
 493     if (sub_vars['DNSFOREST'] != sub_vars['DNSDOMAIN']) and \
 494        sub_vars['DNSFOREST'].endswith('.' + sub_vars['DNSDOMAIN']):
 495         print "Refusing to use samba-tool when forest %s is under domain %s" \
 496             % (sub_vars['DNSFOREST'], sub_vars['DNSDOMAIN'])
 497
 498     if opts.verbose:
 499         print "Calling samba-tool dns for %s (%s)" % (d, op)
 500
 501     normalised_name = d.name.rstrip('.') + '.'
 502     if zone is None:
 503         if normalised_name == (sub_vars['DNSDOMAIN'] + '.'):
 504             short_name = '@'
 505             zone = sub_vars['DNSDOMAIN']
 506         elif normalised_name == (sub_vars['DNSFOREST'] + '.'):
 507             short_name = '@'
 508             zone = sub_vars['DNSFOREST']
 509         elif normalised_name == ('_msdcs.' + sub_vars['DNSFOREST'] + '.'):
 510             short_name = '@'
 511             zone = '_msdcs.' + sub_vars['DNSFOREST']
 512         else:
 513             if not normalised_name.endswith('.' + sub_vars['DNSDOMAIN'] + '.'):
 514                 print "Not Calling samba-tool dns for %s (%s), %s not in %s" % (d, op, normalised_name, sub_vars['DNSDOMAIN'] + '.')
 515                 return False
 516             elif normalised_name.endswith('._msdcs.' + sub_vars['DNSFOREST'] + '.'):
 517                 zone = '_msdcs.' + sub_vars['DNSFOREST']
 518             else:
 519                 zone = sub_vars['DNSDOMAIN']
 520             len_zone = len(zone)+2
 521             short_name = normalised_name[:-len_zone]
 522     else:
 523         len_zone = len(zone)+2
 524         short_name = normalised_name[:-len_zone]
 525
 526     if d.type == "A":
 527         args = [rpc_server_ip, zone, short_name, "A", d.ip]
 528     if d.type == "AAAA":
 529         args = [rpc_server_ip, zone, short_name, "AAAA", d.ip]
 530     if d.type == "SRV":
 531         if op == "add" and d.existing_port is not None:
 532             print "Not handling modify of exising SRV %s using samba-tool" % d
 533             return False
 534             op = "update"
 535             args = [rpc_server_ip, zone, short_name, "SRV",
 536                     "%s %s %s %s" % (d.existing_weight,
 537                                      d.existing_port, "0", "100"),
 538                     "%s %s %s %s" % (d.dest, d.port, "0", "100")]
 539         else:
 540             args = [rpc_server_ip, zone, short_name, "SRV", "%s %s %s %s" % (d.dest, d.port, "0", "100")]
 541     if d.type == "CNAME":
 542         if d.existing_cname_target is None:
 543             args = [rpc_server_ip, zone, short_name, "CNAME", d.dest]
 544         else:
 545             op = "update"
 546             args = [rpc_server_ip, zone, short_name, "CNAME",
 547                     d.existing_cname_target.rstrip('.'), d.dest]
 548
 549     if d.type == "NS":
 550         args = [rpc_server_ip, zone, short_name, "NS", d.dest]
 551
 552     global error_count
 553     try:
 554         cmd = cmd_dns()
 555         if opts.verbose:
 556             print "Calling samba-tool dns %s -k no -P %s" % (op, args)
 557         ret = cmd._run("dns", op, "-k", "no", "-P", *args)
 558         if ret == -1:
 559             if opts.fail_immediately:
 560                 sys.exit(1)
 561             error_count = error_count + 1
 562             if opts.verbose:
 563                 print("Failed 'samba-tool dns' based update: %s" % (str(d)))
 564     except Exception, estr:
 565         if opts.fail_immediately:
 566             sys.exit(1)
 567         error_count = error_count + 1
 568         if opts.verbose:
 569             print("Failed 'samba-tool dns' based update: %s : %s" % (str(d), estr))
 570         raise
 571
 572 def rodc_dns_update(d, t, op):
 573     '''a single DNS update via the RODC netlogon call'''
 574     global sub_vars
 575
 576     assert(op in ["add", "delete"])
 577
 578     if opts.verbose:
 579         print "Calling netlogon RODC update for %s" % d
 580
 581     typemap = {
 582         netlogon.NlDnsLdapAtSite       : netlogon.NlDnsInfoTypeNone,
 583         netlogon.NlDnsGcAtSite         : netlogon.NlDnsDomainNameAlias,
 584         netlogon.NlDnsDsaCname         : netlogon.NlDnsDomainNameAlias,
 585         netlogon.NlDnsKdcAtSite        : netlogon.NlDnsInfoTypeNone,
 586         netlogon.NlDnsDcAtSite         : netlogon.NlDnsInfoTypeNone,
 587         netlogon.NlDnsRfc1510KdcAtSite : netlogon.NlDnsInfoTypeNone,
 588         netlogon.NlDnsGenericGcAtSite  : netlogon.NlDnsDomainNameAlias
 589         }
 590
 591     w = winbind.winbind("irpc:winbind_server", lp)
 592     dns_names = netlogon.NL_DNS_NAME_INFO_ARRAY()
 593     dns_names.count = 1
 594     name = netlogon.NL_DNS_NAME_INFO()
 595     name.type = t
 596     name.dns_domain_info_type = typemap[t]
 597     name.priority = 0
 598     name.weight   = 0
 599     if d.port is not None:
 600         name.port = int(d.port)
 601     if op == "add":
 602         name.dns_register = True
 603     else:
 604         name.dns_register = False
 605     dns_names.names = [ name ]
 606     site_name = sub_vars['SITE'].decode('utf-8')
 607
 608     global error_count
 609
 610     try:
 611         ret_names = w.DsrUpdateReadOnlyServerDnsRecords(site_name, default_ttl, dns_names)
 612         if ret_names.names[0].status != 0:
 613             print("Failed to set DNS entry: %s (status %u)" % (d, ret_names.names[0].status))
 614             error_count = error_count + 1
 615     except RuntimeError, reason:
 616         print("Error setting DNS entry of type %u: %s: %s" % (t, d, reason))
 617         error_count = error_count + 1
 618
 619     if error_count != 0 and opts.fail_immediately:
 620         sys.exit(1)
 621
 622
 623 def call_rodc_update(d, op="add"):
 624     '''RODCs need to use the netlogon API for nsupdate'''
 625     global lp, sub_vars
 626
 627     assert(op in ["add", "delete"])
 628
 629     # we expect failure for 3268 if we aren't a GC
 630     if d.port is not None and int(d.port) == 3268:
 631         return
 632
 633     # map the DNS request to a netlogon update type
 634     map = {
 635         netlogon.NlDnsLdapAtSite       : '_ldap._tcp.${SITE}._sites.${DNSDOMAIN}',
 636         netlogon.NlDnsGcAtSite         : '_ldap._tcp.${SITE}._sites.gc._msdcs.${DNSDOMAIN}',
 637         netlogon.NlDnsDsaCname         : '${NTDSGUID}._msdcs.${DNSFOREST}',
 638         netlogon.NlDnsKdcAtSite        : '_kerberos._tcp.${SITE}._sites.dc._msdcs.${DNSDOMAIN}',
 639         netlogon.NlDnsDcAtSite         : '_ldap._tcp.${SITE}._sites.dc._msdcs.${DNSDOMAIN}',
 640         netlogon.NlDnsRfc1510KdcAtSite : '_kerberos._tcp.${SITE}._sites.${DNSDOMAIN}',
 641         netlogon.NlDnsGenericGcAtSite  : '_gc._tcp.${SITE}._sites.${DNSFOREST}'
 642         }
 643
 644     for t in map:
 645         subname = samba.substitute_var(map[t], sub_vars)
 646         if subname.lower() == d.name.lower():
 647             # found a match - do the update
 648             rodc_dns_update(d, t, op)
 649             return
 650     if opts.verbose:
 651         print("Unable to map to netlogon DNS update: %s" % d)
 652
 653
 654 # get the list of DNS entries we should have
 655 if opts.update_list:
 656     dns_update_list = opts.update_list
 657 else:
 658     dns_update_list = lp.private_path('dns_update_list')
 659
 660 if opts.update_cache:
 661     dns_update_cache = opts.update_cache
 662 else:
 663     dns_update_cache = lp.private_path('dns_update_cache')
 664
 665 # use our private krb5.conf to avoid problems with the wrong domain
 666 # bind9 nsupdate wants the default domain set
 667 krb5conf = lp.private_path('krb5.conf')
 668 os.environ['KRB5_CONFIG'] = krb5conf
 669
 670 file = open(dns_update_list, "r")
 671
 672 if opts.nosubs:
 673     sub_vars = {}
 674 else:
 675     samdb = SamDB(url=lp.samdb_url(), session_info=system_session(), lp=lp)
 676
 677     # get the substitution dictionary
 678     sub_vars = get_subst_vars(samdb)
 679
 680 # build up a list of update commands to pass to nsupdate
 681 update_list = []
 682 dns_list = []
 683 cache_list = []
 684 delete_list = []
 685
 686 dup_set = set()
 687 cache_set = set()
 688
 689 rebuild_cache = False
 690 try:
 691     cfile = open(dns_update_cache, 'r+')
 692 except IOError:
 693     # Perhaps create it
 694     cfile = open(dns_update_cache, 'w+')
 695     # Open it for reading again, in case someone else got to it first
 696     cfile = open(dns_update_cache, 'r+')
 697 fcntl.lockf(cfile, fcntl.LOCK_EX)
 698 for line in cfile:
 699     line = line.strip()
 700     if line == '' or line[0] == "#":
 701         continue
 702     c = parse_dns_line(line, {})
 703     if c is None:
 704         continue
 705     if str(c) not in cache_set:
 706         cache_list.append(c)
 707         cache_set.add(str(c))
 708
 709 # read each line, and check that the DNS name exists
 710 for line in file:
 711     line = line.strip()
 712     if line == '' or line[0] == "#":
 713         continue
 714     d = parse_dns_line(line, sub_vars)
 715     if d is None:
 716         continue
 717     if d.type == 'A' and len(IP4s) == 0:
 718         continue
 719     if d.type == 'AAAA' and len(IP6s) == 0:
 720         continue
 721     if str(d) not in dup_set:
 722         dns_list.append(d)
 723         dup_set.add(str(d))
 724
 725 # now expand the entries, if any are A record with ip set to $IP
 726 # then replace with multiple entries, one for each interface IP
 727 for d in dns_list:
 728     if d.ip != "$IP":
 729         continue
 730     if d.type == 'A':
 731         d.ip = IP4s[0]
 732         for i in range(len(IP4s)-1):
 733             d2 = dnsobj(str(d))
 734             d2.ip = IP4s[i+1]
 735             dns_list.append(d2)
 736     if d.type == 'AAAA':
 737         d.ip = IP6s[0]
 738         for i in range(len(IP6s)-1):
 739             d2 = dnsobj(str(d))
 740             d2.ip = IP6s[i+1]
 741             dns_list.append(d2)
 742
 743 # now check if the entries already exist on the DNS server
 744 for d in dns_list:
 745     found = False
 746     for c in cache_list:
 747         if str(c).lower() == str(d).lower():
 748             found = True
 749             break
 750     if not found:
 751         rebuild_cache = True
 752         if opts.verbose:
 753             print "need cache add: %s" % d
 754     if opts.all_names:
 755         update_list.append(d)
 756         if opts.verbose:
 757             print "force update: %s" % d
 758     elif not check_dns_name(d):
 759         update_list.append(d)
 760         if opts.verbose:
 761             print "need update: %s" % d
 762
 763
 764 for c in cache_list:
 765     found = False
 766     for d in dns_list:
 767         if str(c).lower() == str(d).lower():
 768             found = True
 769             break
 770     if found:
 771         continue
 772     rebuild_cache = True
 773     if opts.verbose:
 774         print "need cache remove: %s" % c
 775     if not opts.all_names and not check_dns_name(c):
 776         continue
 777     delete_list.append(c)
 778     if opts.verbose:
 779         print "need delete: %s" % c
 780
 781 if len(delete_list) == 0 and len(update_list) == 0 and not rebuild_cache:
 782     if opts.verbose:
 783         print "No DNS updates needed"
 784     sys.exit(0)
 785 else:
 786     if opts.verbose:
 787         print "%d DNS updates and %d DNS deletes needed" % (len(update_list), len(delete_list))
 788
 789 use_samba_tool = opts.use_samba_tool
 790 use_nsupdate = opts.use_nsupdate
 791 # get our krb5 creds
 792 if len(delete_list) != 0 or len(update_list) != 0 and not opts.nocreds:
 793     try:
 794         creds = get_credentials(lp)
 795     except RuntimeError as e:
 796         ccachename = None
 797
 798         if sub_vars['IF_RWDNS_DOMAIN'] == "# ":
 799             raise
 800
 801         if use_nsupdate:
 802             raise
 803
 804         print "Failed to get Kerberos credentials, falling back to samba-tool: %s" % e
 805         use_samba_tool = True
 806
 807
 808 # ask nsupdate to delete entries as needed
 809 for d in delete_list:
 810     if d.rpc or (not use_nsupdate and use_samba_tool):
 811         if opts.verbose:
 812             print "update (samba-tool): %s" % d
 813         call_samba_tool(d, op="delete", zone=d.zone)
 814
 815     elif am_rodc:
 816         if d.name.lower() == domain.lower():
 817             if opts.verbose:
 818                 print "skip delete (rodc): %s" % d
 819             continue
 820         if not d.type in [ 'A', 'AAAA' ]:
 821             if opts.verbose:
 822                 print "delete (rodc): %s" % d
 823             call_rodc_update(d, op="delete")
 824         else:
 825             if opts.verbose:
 826                 print "delete (nsupdate): %s" % d
 827             call_nsupdate(d, op="delete")
 828     else:
 829         if opts.verbose:
 830             print "delete (nsupdate): %s" % d
 831         call_nsupdate(d, op="delete")
 832
 833 # ask nsupdate to add entries as needed
 834 for d in update_list:
 835     if d.rpc or (not use_nsupdate and use_samba_tool):
 836         if opts.verbose:
 837             print "update (samba-tool): %s" % d
 838         call_samba_tool(d, zone=d.zone)
 839
 840     elif am_rodc:
 841         if d.name.lower() == domain.lower():
 842             if opts.verbose:
 843                 print "skip (rodc): %s" % d
 844             continue
 845         if not d.type in [ 'A', 'AAAA' ]:
 846             if opts.verbose:
 847                 print "update (rodc): %s" % d
 848             call_rodc_update(d)
 849         else:
 850             if opts.verbose:
 851                 print "update (nsupdate): %s" % d
 852             call_nsupdate(d)
 853     else:
 854         if opts.verbose:
 855             print "update(nsupdate): %s" % d
 856         call_nsupdate(d)
 857
 858 if rebuild_cache:
 859     print "Rebuilding cache at %s" % dns_update_cache
 860     (file_dir, file_name) = os.path.split(dns_update_cache)
 861     (tmp_fd, tmpfile) = tempfile.mkstemp(dir=file_dir, prefix=file_name, suffix="XXXXXX")
 862     wfile = os.fdopen(tmp_fd, 'a')
 863     for d in dns_list:
 864         if opts.verbose:
 865             print "Adding %s to %s" % (str(d), file_name)
 866         wfile.write(str(d)+"\n")
 867     os.rename(tmpfile, dns_update_cache)
 868 fcntl.lockf(cfile, fcntl.LOCK_UN)
 869
 870 # delete the ccache if we created it
 871 if ccachename is not None:
 872     os.unlink(ccachename)
 873
 874 if error_count != 0:
 875     print("Failed update of %u entries" % error_count)
 876 sys.exit(error_count)