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