source4/dsdb/dns/dns_update.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3
   4    DNS update service
   5
   6    Copyright (C) Andrew Tridgell 2009
   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
  23 /*
  24   this module auto-creates the named.conf.update file, which tells
  25   bind9 what KRB5 principals it should accept for updates to our zone
  26
  27   It also uses the samba_dnsupdate script to auto-create the right DNS
  28   names for ourselves as a DC in the domain, using TSIG-GSS
  29  */
  30
  31 #include "includes.h"
  32 #include "dsdb/samdb/samdb.h"
  33 #include "auth/auth.h"
  34 #include "smbd/service.h"
  35 #include "lib/messaging/irpc.h"
  36 #include "param/param.h"
  37 #include "system/filesys.h"
  38 #include "dsdb/common/util.h"
  39 #include "libcli/composite/composite.h"
  40 #include "libcli/security/dom_sid.h"
  41 #include "librpc/gen_ndr/ndr_irpc.h"
  42
  43 NTSTATUS server_service_dnsupdate_init(void);
  44
  45 struct dnsupdate_service {
  46         struct task_server *task;
  47         struct auth_session_info *system_session_info;
  48         struct ldb_context *samdb;
  49
  50         /* status for periodic config file update */
  51         struct {
  52                 uint32_t interval;
  53                 struct tevent_timer *te;
  54                 struct tevent_req *subreq;
  55                 NTSTATUS status;
  56         } confupdate;
  57
  58         /* status for periodic DNS name check */
  59         struct {
  60                 uint32_t interval;
  61                 struct tevent_timer *te;
  62                 struct tevent_req *subreq;
  63                 struct tevent_req *spnreq;
  64                 NTSTATUS status;
  65         } nameupdate;
  66 };
  67
  68 /*
  69   called when rndc reload has finished
  70  */
  71 static void dnsupdate_rndc_done(struct tevent_req *subreq)
  72 {
  73         struct dnsupdate_service *service = tevent_req_callback_data(subreq,
  74                                             struct dnsupdate_service);
  75         int ret;
  76         int sys_errno;
  77
  78         service->confupdate.subreq = NULL;
  79
  80         ret = samba_runcmd_recv(subreq, &sys_errno);
  81         TALLOC_FREE(subreq);
  82         if (ret != 0) {
  83                 service->confupdate.status = map_nt_error_from_unix_common(sys_errno);
  84         } else {
  85                 service->confupdate.status = NT_STATUS_OK;
  86         }
  87
  88         if (!NT_STATUS_IS_OK(service->confupdate.status)) {
  89                 DEBUG(0,(__location__ ": Failed rndc update - %s\n",
  90                          nt_errstr(service->confupdate.status)));
  91         } else {
  92                 DEBUG(3,("Completed rndc reload OK\n"));
  93         }
  94 }
  95
  96 /*
  97   called every 'dnsupdate:conf interval' seconds
  98  */
  99 static void dnsupdate_rebuild(struct dnsupdate_service *service)
 100 {
 101         int ret;
 102         size_t size;
 103         struct ldb_result *res1, *res2;
 104         const char *tmp_path, *path, *path_static;
 105         char *static_policies;
 106         int fd;
 107         unsigned int i;
 108         const char *attrs1[] = { "msDS-HasDomainNCs", NULL };
 109         const char *attrs2[] = { "name", NULL };
 110         const char *realm = lpcfg_realm(service->task->lp_ctx);
 111         TALLOC_CTX *tmp_ctx = talloc_new(service);
 112         const char * const *rndc_command = lpcfg_rndc_command(service->task->lp_ctx);
 113         const char **dc_list;
 114         int dc_count=0;
 115
 116         /* abort any pending script run */
 117         TALLOC_FREE(service->confupdate.subreq);
 118
 119         /* find the DNs for all the non-RODC DCs in the forest */
 120         ret = dsdb_search(service->samdb, tmp_ctx, &res1, ldb_get_config_basedn(service->samdb),
 121                           LDB_SCOPE_SUBTREE,
 122                           attrs1,
 123                           0,
 124                           "(&(objectclass=NTDSDSA)(!(msDS-isRODC=TRUE)))");
 125         if (ret != LDB_SUCCESS) {
 126                 DEBUG(0,(__location__ ": Unable to find DCs list - %s", ldb_errstring(service->samdb)));
 127                 talloc_free(tmp_ctx);
 128                 return;
 129         }
 130
 131         dc_list = talloc_array(tmp_ctx, const char *, 0);
 132         for (i=0; i<res1->count; i++) {
 133                 struct ldb_dn *server_dn = res1->msgs[i]->dn;
 134                 struct ldb_dn *domain_dn;
 135                 const char *acct_name, *full_account, *dns_domain;
 136
 137                 /* this is a nasty hack to form the account name of
 138                  * this DC. We do it this way as we don't necessarily
 139                  * have access to the domain NC, so all we have to go
 140                  * on is what is in the configuration partition
 141                  */
 142
 143                 domain_dn = ldb_msg_find_attr_as_dn(service->samdb, tmp_ctx, res1->msgs[i], "msDS-HasDomainNCs");
 144                 if (domain_dn == NULL) continue;
 145
 146                 ldb_dn_remove_child_components(server_dn, 1);
 147                 ret = dsdb_search_dn(service->samdb, tmp_ctx, &res2, server_dn, attrs2, 0);
 148                 if (ret != LDB_SUCCESS) {
 149                         continue;
 150                 }
 151
 152                 acct_name = ldb_msg_find_attr_as_string(res2->msgs[0], "name", NULL);
 153                 if (acct_name == NULL) continue;
 154
 155                 dns_domain = samdb_dn_to_dns_domain(tmp_ctx, domain_dn);
 156                 if (dns_domain == NULL) {
 157                         continue;
 158                 }
 159
 160                 full_account = talloc_asprintf(tmp_ctx, "%s$@%s", acct_name, dns_domain);
 161                 if (full_account == NULL) continue;
 162
 163                 dc_list = talloc_realloc(tmp_ctx, dc_list, const char *, dc_count+1);
 164                 if (dc_list == NULL) {
 165                         continue;
 166                 }
 167                 dc_list[dc_count++] = full_account;
 168         }
 169
 170         path = lpcfg_parm_string(service->task->lp_ctx, NULL, "dnsupdate", "path");
 171         if (path == NULL) {
 172                 path = lpcfg_private_path(tmp_ctx, service->task->lp_ctx, "named.conf.update");
 173         }
 174
 175         path_static = lpcfg_parm_string(service->task->lp_ctx, NULL, "dnsupdate", "extra_static_grant_rules");
 176         if (path_static == NULL) {
 177                 path_static = lpcfg_private_path(tmp_ctx, service->task->lp_ctx, "named.conf.update.static");
 178         }
 179
 180         tmp_path = talloc_asprintf(tmp_ctx, "%s.tmp", path);
 181         if (path == NULL || tmp_path == NULL || path_static == NULL ) {
 182                 DEBUG(0,(__location__ ": Unable to get paths\n"));
 183                 talloc_free(tmp_ctx);
 184                 return;
 185         }
 186
 187         static_policies = file_load(path_static, &size, 0, tmp_ctx);
 188
 189         unlink(tmp_path);
 190         fd = open(tmp_path, O_CREAT|O_TRUNC|O_WRONLY, 0444);
 191         if (fd == -1) {
 192                 DEBUG(1,(__location__ ": Unable to open %s - %s\n", tmp_path, strerror(errno)));
 193                 talloc_free(tmp_ctx);
 194                 return;
 195         }
 196
 197         dprintf(fd, "/* this file is auto-generated - do not edit */\n");
 198         dprintf(fd, "update-policy {\n");
 199         if( static_policies != NULL ) {
 200                 dprintf(fd, "/* Start of static entries */\n");
 201                 dprintf(fd, "%s\n",static_policies);
 202                 dprintf(fd, "/* End of static entries */\n");
 203         }
 204         dprintf(fd, "\tgrant %s ms-self * A AAAA;\n", realm);
 205         dprintf(fd, "\tgrant Administrator@%s wildcard * A AAAA SRV CNAME;\n", realm);
 206
 207         for (i=0; i<dc_count; i++) {
 208                 dprintf(fd, "\tgrant %s wildcard * A AAAA SRV CNAME;\n", dc_list[i]);
 209         }
 210         dprintf(fd, "};\n");
 211         close(fd);
 212
 213
 214         if (NT_STATUS_IS_OK(service->confupdate.status) &&
 215             file_compare(tmp_path, path) == true) {
 216                 unlink(tmp_path);
 217                 talloc_free(tmp_ctx);
 218                 return;
 219         }
 220
 221         if (rename(tmp_path, path) != 0) {
 222                 DEBUG(0,(__location__ ": Failed to rename %s to %s - %s\n",
 223                          tmp_path, path, strerror(errno)));
 224                 talloc_free(tmp_ctx);
 225                 return;
 226         }
 227
 228         DEBUG(2,("Loading new DNS update grant rules\n"));
 229         service->confupdate.subreq = samba_runcmd_send(service,
 230                                                        service->task->event_ctx,
 231                                                        timeval_current_ofs(10, 0),
 232                                                        2, 0,
 233                                                        rndc_command,
 234                                                        "reload", NULL);
 235         if (service->confupdate.subreq == NULL) {
 236                 DEBUG(0,(__location__ ": samba_runcmd_send() failed with no memory\n"));
 237                 talloc_free(tmp_ctx);
 238                 return;
 239         }
 240         tevent_req_set_callback(service->confupdate.subreq,
 241                                 dnsupdate_rndc_done,
 242                                 service);
 243
 244         talloc_free(tmp_ctx);
 245 }
 246
 247 static NTSTATUS dnsupdate_confupdate_schedule(struct dnsupdate_service *service);
 248
 249 /*
 250   called every 'dnsupdate:conf interval' seconds
 251  */
 252 static void dnsupdate_confupdate_handler_te(struct tevent_context *ev, struct tevent_timer *te,
 253                                           struct timeval t, void *ptr)
 254 {
 255         struct dnsupdate_service *service = talloc_get_type(ptr, struct dnsupdate_service);
 256
 257         dnsupdate_rebuild(service);
 258         dnsupdate_confupdate_schedule(service);
 259 }
 260
 261
 262 static NTSTATUS dnsupdate_confupdate_schedule(struct dnsupdate_service *service)
 263 {
 264         service->confupdate.te = tevent_add_timer(service->task->event_ctx, service,
 265                                                 timeval_current_ofs(service->confupdate.interval, 0),
 266                                                 dnsupdate_confupdate_handler_te, service);
 267         NT_STATUS_HAVE_NO_MEMORY(service->confupdate.te);
 268         return NT_STATUS_OK;
 269 }
 270
 271
 272 /*
 273   called when dns update script has finished
 274  */
 275 static void dnsupdate_nameupdate_done(struct tevent_req *subreq)
 276 {
 277         struct dnsupdate_service *service = tevent_req_callback_data(subreq,
 278                                             struct dnsupdate_service);
 279         int ret;
 280         int sys_errno;
 281
 282         service->nameupdate.subreq = NULL;
 283
 284         ret = samba_runcmd_recv(subreq, &sys_errno);
 285         TALLOC_FREE(subreq);
 286         if (ret != 0) {
 287                 service->nameupdate.status = map_nt_error_from_unix_common(sys_errno);
 288         } else {
 289                 service->nameupdate.status = NT_STATUS_OK;
 290         }
 291
 292         if (!NT_STATUS_IS_OK(service->nameupdate.status)) {
 293                 DEBUG(0,(__location__ ": Failed DNS update - %s\n",
 294                          nt_errstr(service->nameupdate.status)));
 295         } else {
 296                 DEBUG(3,("Completed DNS update check OK\n"));
 297         }
 298 }
 299
 300
 301 /*
 302   called when spn update script has finished
 303  */
 304 static void dnsupdate_spnupdate_done(struct tevent_req *subreq)
 305 {
 306         struct dnsupdate_service *service = tevent_req_callback_data(subreq,
 307                                             struct dnsupdate_service);
 308         int ret;
 309         int sys_errno;
 310
 311         service->nameupdate.spnreq = NULL;
 312
 313         ret = samba_runcmd_recv(subreq, &sys_errno);
 314         TALLOC_FREE(subreq);
 315         if (ret != 0) {
 316                 service->nameupdate.status = map_nt_error_from_unix_common(sys_errno);
 317         } else {
 318                 service->nameupdate.status = NT_STATUS_OK;
 319         }
 320
 321         if (!NT_STATUS_IS_OK(service->nameupdate.status)) {
 322                 DEBUG(0,(__location__ ": Failed SPN update - %s\n",
 323                          nt_errstr(service->nameupdate.status)));
 324         } else {
 325                 DEBUG(3,("Completed SPN update check OK\n"));
 326         }
 327 }
 328
 329 /*
 330   called every 'dnsupdate:name interval' seconds
 331  */
 332 static void dnsupdate_check_names(struct dnsupdate_service *service)
 333 {
 334         const char * const *dns_update_command = lpcfg_dns_update_command(service->task->lp_ctx);
 335         const char * const *spn_update_command = lpcfg_spn_update_command(service->task->lp_ctx);
 336
 337         /* kill any existing child */
 338         TALLOC_FREE(service->nameupdate.subreq);
 339
 340         DEBUG(3,("Calling DNS name update script\n"));
 341         service->nameupdate.subreq = samba_runcmd_send(service,
 342                                                        service->task->event_ctx,
 343                                                        timeval_current_ofs(20, 0),
 344                                                        2, 0,
 345                                                        dns_update_command,
 346                                                        NULL);
 347         if (service->nameupdate.subreq == NULL) {
 348                 DEBUG(0,(__location__ ": samba_runcmd_send() failed with no memory\n"));
 349                 return;
 350         }
 351         tevent_req_set_callback(service->nameupdate.subreq,
 352                                 dnsupdate_nameupdate_done,
 353                                 service);
 354
 355         DEBUG(3,("Calling SPN name update script\n"));
 356         service->nameupdate.spnreq = samba_runcmd_send(service,
 357                                                        service->task->event_ctx,
 358                                                        timeval_current_ofs(20, 0),
 359                                                        2, 0,
 360                                                        spn_update_command,
 361                                                        NULL);
 362         if (service->nameupdate.spnreq == NULL) {
 363                 DEBUG(0,(__location__ ": samba_runcmd_send() failed with no memory\n"));
 364                 return;
 365         }
 366         tevent_req_set_callback(service->nameupdate.spnreq,
 367                                 dnsupdate_spnupdate_done,
 368                                 service);
 369 }
 370
 371 static NTSTATUS dnsupdate_nameupdate_schedule(struct dnsupdate_service *service);
 372
 373 /*
 374   called every 'dnsupdate:name interval' seconds
 375  */
 376 static void dnsupdate_nameupdate_handler_te(struct tevent_context *ev, struct tevent_timer *te,
 377                                             struct timeval t, void *ptr)
 378 {
 379         struct dnsupdate_service *service = talloc_get_type(ptr, struct dnsupdate_service);
 380
 381         dnsupdate_check_names(service);
 382         dnsupdate_nameupdate_schedule(service);
 383 }
 384
 385
 386 static NTSTATUS dnsupdate_nameupdate_schedule(struct dnsupdate_service *service)
 387 {
 388         service->nameupdate.te = tevent_add_timer(service->task->event_ctx, service,
 389                                                   timeval_current_ofs(service->nameupdate.interval, 0),
 390                                                   dnsupdate_nameupdate_handler_te, service);
 391         NT_STATUS_HAVE_NO_MEMORY(service->nameupdate.te);
 392         return NT_STATUS_OK;
 393 }
 394
 395
 396 struct dnsupdate_RODC_state {
 397         struct irpc_message *msg;
 398         struct dnsupdate_RODC *r;
 399         char *tmp_path;
 400         int fd;
 401 };
 402
 403 static int dnsupdate_RODC_destructor(struct dnsupdate_RODC_state *st)
 404 {
 405         if (st->fd != -1) {
 406                 close(st->fd);
 407         }
 408         unlink(st->tmp_path);
 409         return 0;
 410 }
 411
 412 /*
 413   called when the DNS update has completed
 414  */
 415 static void dnsupdate_RODC_callback(struct tevent_req *req)
 416 {
 417         struct dnsupdate_RODC_state *st =
 418                 tevent_req_callback_data(req,
 419                                          struct dnsupdate_RODC_state);
 420         int sys_errno;
 421         int i, ret;
 422
 423         ret = samba_runcmd_recv(req, &sys_errno);
 424         talloc_free(req);
 425         if (ret != 0) {
 426                 st->r->out.result = map_nt_error_from_unix_common(sys_errno);
 427                 DEBUG(2,(__location__ ": RODC DNS Update failed: %s\n", nt_errstr(st->r->out.result)));
 428         } else {
 429                 st->r->out.result = NT_STATUS_OK;
 430                 DEBUG(3,(__location__ ": RODC DNS Update OK\n"));
 431         }
 432
 433         for (i=0; i<st->r->in.dns_names->count; i++) {
 434                 st->r->out.dns_names->names[i].status = NT_STATUS_V(st->r->out.result);
 435         }
 436
 437         irpc_send_reply(st->msg, NT_STATUS_OK);
 438 }
 439
 440
 441 /**
 442  * Called when we get a RODC DNS update request from the netlogon
 443  * rpc server
 444  */
 445 static NTSTATUS dnsupdate_dnsupdate_RODC(struct irpc_message *msg,
 446                                          struct dnsupdate_RODC *r)
 447 {
 448         struct dnsupdate_service *s = talloc_get_type(msg->private_data,
 449                                                       struct dnsupdate_service);
 450         const char * const *dns_update_command = lpcfg_dns_update_command(s->task->lp_ctx);
 451         struct dnsupdate_RODC_state *st;
 452         struct tevent_req *req;
 453         int i, ret;
 454         struct GUID ntds_guid;
 455         const char *site, *dnsdomain, *dnsforest, *ntdsguid, *hostname;
 456         struct ldb_dn *sid_dn;
 457         const char *attrs[] = { "dNSHostName", NULL };
 458         struct ldb_result *res;
 459
 460         st = talloc_zero(msg, struct dnsupdate_RODC_state);
 461         if (!st) {
 462                 r->out.result = NT_STATUS_NO_MEMORY;
 463                 return NT_STATUS_OK;
 464         }
 465
 466         st->r = r;
 467         st->msg = msg;
 468
 469         st->tmp_path = smbd_tmp_path(st, s->task->lp_ctx, "rodcdns.XXXXXX");
 470         if (!st->tmp_path) {
 471                 talloc_free(st);
 472                 r->out.result = NT_STATUS_NO_MEMORY;
 473                 return NT_STATUS_OK;
 474         }
 475
 476         st->fd = mkstemp(st->tmp_path);
 477         if (st->fd == -1) {
 478                 DEBUG(0,("Unable to create a temporary file for RODC dnsupdate\n"));
 479                 talloc_free(st);
 480                 r->out.result = NT_STATUS_INTERNAL_DB_CORRUPTION;
 481                 return NT_STATUS_OK;
 482         }
 483
 484         talloc_set_destructor(st, dnsupdate_RODC_destructor);
 485
 486         sid_dn = ldb_dn_new_fmt(st, s->samdb, "<SID=%s>", dom_sid_string(st, r->in.dom_sid));
 487         if (!sid_dn) {
 488                 talloc_free(st);
 489                 r->out.result = NT_STATUS_NO_MEMORY;
 490                 return NT_STATUS_OK;
 491         }
 492
 493         /* work out the site */
 494         ret = samdb_find_site_for_computer(s->samdb, st, sid_dn, &site);
 495         if (ret != LDB_SUCCESS) {
 496                 DEBUG(2, (__location__ ": Unable to find site for computer %s\n",
 497                           ldb_dn_get_linearized(sid_dn)));
 498                 talloc_free(st);
 499                 r->out.result = NT_STATUS_NO_SUCH_USER;
 500                 return NT_STATUS_OK;
 501         }
 502
 503         /* work out the ntdsguid */
 504         ret = samdb_find_ntdsguid_for_computer(s->samdb, sid_dn, &ntds_guid);
 505         ntdsguid = GUID_string(st, &ntds_guid);
 506         if (ret != LDB_SUCCESS || !ntdsguid) {
 507                 DEBUG(2, (__location__ ": Unable to find NTDS GUID for computer %s\n",
 508                           ldb_dn_get_linearized(sid_dn)));
 509                 talloc_free(st);
 510                 r->out.result = NT_STATUS_NO_SUCH_USER;
 511                 return NT_STATUS_OK;
 512         }
 513
 514
 515         /* find dnsdomain and dnsforest */
 516         dnsdomain = lpcfg_realm(s->task->lp_ctx);
 517         dnsforest = dnsdomain;
 518
 519         /* find the hostname */
 520         ret = dsdb_search_dn(s->samdb, st, &res, sid_dn, attrs, 0);
 521         if (ret == LDB_SUCCESS) {
 522                 hostname = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName", NULL);
 523         }
 524         if (ret != LDB_SUCCESS || !hostname) {
 525                 DEBUG(2, (__location__ ": Unable to find NTDS GUID for computer %s\n",
 526                           ldb_dn_get_linearized(sid_dn)));
 527                 talloc_free(st);
 528                 r->out.result = NT_STATUS_NO_SUCH_USER;
 529                 return NT_STATUS_OK;
 530         }
 531
 532
 533         for (i=0; i<st->r->in.dns_names->count; i++) {
 534                 struct NL_DNS_NAME_INFO *n = &r->in.dns_names->names[i];
 535                 switch (n->type) {
 536                 case NlDnsLdapAtSite:
 537                         dprintf(st->fd, "SRV _ldap._tcp.%s._sites.%s. %s %u\n",
 538                                 site, dnsdomain, hostname, n->port);
 539                         break;
 540                 case NlDnsGcAtSite:
 541                         dprintf(st->fd, "SRV _ldap._tcp.%s._sites.gc._msdcs.%s. %s %u\n",
 542                                 site, dnsdomain, hostname, n->port);
 543                         break;
 544                 case NlDnsDsaCname:
 545                         dprintf(st->fd, "CNAME %s._msdcs.%s. %s\n",
 546                                 ntdsguid, dnsforest, hostname);
 547                         break;
 548                 case NlDnsKdcAtSite:
 549                         dprintf(st->fd, "SRV _kerberos._tcp.%s._sites.dc._msdcs.%s. %s %u\n",
 550                                 site, dnsdomain, hostname, n->port);
 551                         break;
 552                 case NlDnsDcAtSite:
 553                         dprintf(st->fd, "SRV _ldap._tcp.%s._sites.dc._msdcs.%s. %s %u\n",
 554                                 site, dnsdomain, hostname, n->port);
 555                         break;
 556                 case NlDnsRfc1510KdcAtSite:
 557                         dprintf(st->fd, "SRV _kerberos._tcp.%s._sites.%s. %s %u\n",
 558                                 site, dnsdomain, hostname, n->port);
 559                         break;
 560                 case NlDnsGenericGcAtSite:
 561                         dprintf(st->fd, "SRV _gc._tcp.%s._sites.%s. %s %u\n",
 562                                 site, dnsforest, hostname, n->port);
 563                         break;
 564                 }
 565         }
 566
 567         close(st->fd);
 568         st->fd = -1;
 569
 570         DEBUG(3,("Calling RODC DNS name update script %s\n", st->tmp_path));
 571         req = samba_runcmd_send(st,
 572                                 s->task->event_ctx,
 573                                 timeval_current_ofs(20, 0),
 574                                 2, 0,
 575                                 dns_update_command,
 576                                 "--update-list",
 577                                 st->tmp_path,
 578                                 NULL);
 579         NT_STATUS_HAVE_NO_MEMORY(req);
 580
 581         /* setup the callback */
 582         tevent_req_set_callback(req, dnsupdate_RODC_callback, st);
 583
 584         msg->defer_reply = true;
 585
 586         return NT_STATUS_OK;
 587 }
 588
 589 /*
 590   startup the dns update task
 591 */
 592 static void dnsupdate_task_init(struct task_server *task)
 593 {
 594         NTSTATUS status;
 595         struct dnsupdate_service *service;
 596
 597         if (lpcfg_server_role(task->lp_ctx) != ROLE_ACTIVE_DIRECTORY_DC) {
 598                 /* not useful for non-DC */
 599                 return;
 600         }
 601
 602         task_server_set_title(task, "task[dnsupdate]");
 603
 604         service = talloc_zero(task, struct dnsupdate_service);
 605         if (!service) {
 606                 task_server_terminate(task, "dnsupdate_task_init: out of memory", true);
 607                 return;
 608         }
 609         service->task           = task;
 610         task->private_data      = service;
 611
 612         service->system_session_info = system_session(service->task->lp_ctx);
 613         if (!service->system_session_info) {
 614                 task_server_terminate(task,
 615                                       "dnsupdate: Failed to obtain server credentials\n",
 616                                       true);
 617                 return;
 618         }
 619
 620         service->samdb = samdb_connect(service, service->task->event_ctx, task->lp_ctx,
 621                                        service->system_session_info, 0);
 622         if (!service->samdb) {
 623                 task_server_terminate(task, "dnsupdate: Failed to connect to local samdb\n",
 624                                       true);
 625                 return;
 626         }
 627
 628         service->confupdate.interval    = lpcfg_parm_int(task->lp_ctx, NULL,
 629                                                       "dnsupdate", "config interval", 60); /* in seconds */
 630
 631         service->nameupdate.interval    = lpcfg_parm_int(task->lp_ctx, NULL,
 632                                                       "dnsupdate", "name interval", 600); /* in seconds */
 633
 634         dnsupdate_rebuild(service);
 635         status = dnsupdate_confupdate_schedule(service);
 636         if (!NT_STATUS_IS_OK(status)) {
 637                 task_server_terminate(task, talloc_asprintf(task,
 638                                       "dnsupdate: Failed to confupdate schedule: %s\n",
 639                                                             nt_errstr(status)), true);
 640                 return;
 641         }
 642
 643         dnsupdate_check_names(service);
 644         status = dnsupdate_nameupdate_schedule(service);
 645         if (!NT_STATUS_IS_OK(status)) {
 646                 task_server_terminate(task, talloc_asprintf(task,
 647                                       "dnsupdate: Failed to nameupdate schedule: %s\n",
 648                                                             nt_errstr(status)), true);
 649                 return;
 650         }
 651
 652         irpc_add_name(task->msg_ctx, "dnsupdate");
 653
 654         IRPC_REGISTER(task->msg_ctx, irpc, DNSUPDATE_RODC,
 655                       dnsupdate_dnsupdate_RODC, service);
 656
 657         /* create the intial file */
 658         dnsupdate_rebuild(service);
 659
 660 }
 661
 662 /*
 663   register ourselves as a available server
 664 */
 665 NTSTATUS server_service_dnsupdate_init(void)
 666 {
 667         return register_server_service("dnsupdate", dnsupdate_task_init);
 668 }