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 #include "libds/common/roles.h"
  43
  44 NTSTATUS server_service_dnsupdate_init(TALLOC_CTX *);
  45
  46 struct dnsupdate_service {
  47         struct task_server *task;
  48         struct auth_session_info *system_session_info;
  49         struct ldb_context *samdb;
  50
  51         /* status for periodic config file update */
  52         struct {
  53                 uint32_t interval;
  54                 struct tevent_timer *te;
  55                 struct tevent_req *subreq;
  56                 NTSTATUS status;
  57         } confupdate;
  58
  59         /* status for periodic DNS name check */
  60         struct {
  61                 uint32_t interval;
  62                 struct tevent_timer *te;
  63                 struct tevent_req *subreq;
  64                 struct tevent_req *spnreq;
  65                 NTSTATUS status;
  66         } nameupdate;
  67 };
  68
  69 /*
  70   called when rndc reload has finished
  71  */
  72 static void dnsupdate_rndc_done(struct tevent_req *subreq)
  73 {
  74         struct dnsupdate_service *service = tevent_req_callback_data(subreq,
  75                                             struct dnsupdate_service);
  76         int ret;
  77         int sys_errno;
  78
  79         service->confupdate.subreq = NULL;
  80
  81         ret = samba_runcmd_recv(subreq, &sys_errno);
  82         TALLOC_FREE(subreq);
  83         if (ret != 0) {
  84                 service->confupdate.status = map_nt_error_from_unix_common(sys_errno);
  85         } else {
  86                 service->confupdate.status = NT_STATUS_OK;
  87         }
  88
  89         if (!NT_STATUS_IS_OK(service->confupdate.status)) {
  90                 DEBUG(0,(__location__ ": Failed rndc update - %s\n",
  91                          nt_errstr(service->confupdate.status)));
  92         } else {
  93                 DEBUG(3,("Completed rndc reload OK\n"));
  94         }
  95 }
  96
  97 /*
  98   called every 'dnsupdate:conf interval' seconds
  99  */
 100 static void dnsupdate_rebuild(struct dnsupdate_service *service)
 101 {
 102         int ret;
 103         size_t size;
 104         struct ldb_result *res1, *res2;
 105         const char *tmp_path, *path, *path_static;
 106         char *static_policies;
 107         int fd;
 108         unsigned int i;
 109         const char *attrs1[] = { "msDS-HasDomainNCs", NULL };
 110         const char *attrs2[] = { "name", NULL };
 111         const char *realm = lpcfg_realm(service->task->lp_ctx);
 112         TALLOC_CTX *tmp_ctx = talloc_new(service);
 113         const char * const *rndc_command = lpcfg_rndc_command(service->task->lp_ctx);
 114         const char **dc_list;
 115         int dc_count=0;
 116
 117         /* abort any pending script run */
 118         TALLOC_FREE(service->confupdate.subreq);
 119
 120         /* find the DNs for all the non-RODC DCs in the forest */
 121         ret = dsdb_search(service->samdb, tmp_ctx, &res1, ldb_get_config_basedn(service->samdb),
 122                           LDB_SCOPE_SUBTREE,
 123                           attrs1,
 124                           0,
 125                           "(&(objectclass=NTDSDSA)(!(msDS-isRODC=TRUE)))");
 126         if (ret != LDB_SUCCESS) {
 127                 DEBUG(0,(__location__ ": Unable to find DCs list - %s", ldb_errstring(service->samdb)));
 128                 talloc_free(tmp_ctx);
 129                 return;
 130         }
 131
 132         dc_list = talloc_array(tmp_ctx, const char *, 0);
 133         for (i=0; i<res1->count; i++) {
 134                 struct ldb_dn *server_dn = res1->msgs[i]->dn;
 135                 struct ldb_dn *domain_dn;
 136                 const char *acct_name, *full_account, *dns_domain;
 137
 138                 /* this is a nasty hack to form the account name of
 139                  * this DC. We do it this way as we don't necessarily
 140                  * have access to the domain NC, so all we have to go
 141                  * on is what is in the configuration partition
 142                  */
 143
 144                 domain_dn = ldb_msg_find_attr_as_dn(service->samdb, tmp_ctx, res1->msgs[i], "msDS-HasDomainNCs");
 145                 if (domain_dn == NULL) continue;
 146
 147                 ldb_dn_remove_child_components(server_dn, 1);
 148                 ret = dsdb_search_dn(service->samdb, tmp_ctx, &res2, server_dn, attrs2, 0);
 149                 if (ret != LDB_SUCCESS) {
 150                         continue;
 151                 }
 152
 153                 acct_name = ldb_msg_find_attr_as_string(res2->msgs[0], "name", NULL);
 154                 if (acct_name == NULL) continue;
 155
 156                 dns_domain = samdb_dn_to_dns_domain(tmp_ctx, domain_dn);
 157                 if (dns_domain == NULL) {
 158                         continue;
 159                 }
 160
 161                 full_account = talloc_asprintf(tmp_ctx, "%s$@%s", acct_name, dns_domain);
 162                 if (full_account == NULL) continue;
 163
 164                 dc_list = talloc_realloc(tmp_ctx, dc_list, const char *, dc_count+1);
 165                 if (dc_list == NULL) {
 166                         continue;
 167                 }
 168                 dc_list[dc_count++] = full_account;
 169         }
 170
 171         path = lpcfg_parm_string(service->task->lp_ctx, NULL, "dnsupdate", "path");
 172         if (path == NULL) {
 173                 path = lpcfg_private_path(tmp_ctx,
 174                                           service->task->lp_ctx,
 175                                           "named.conf.update");
 176                 if (path == NULL) {
 177                         DBG_ERR("Out of memory!");
 178                         talloc_free(tmp_ctx);
 179                         return;
 180                 }
 181
 182                 /*
 183                  * If the file doesn't exist, we provisioned in a the new
 184                  * bind-dns directory
 185                  */
 186                 if (!file_exist(path)) {
 187                         path = talloc_asprintf(tmp_ctx,
 188                                                "%s/named.conf.update",
 189                                                lpcfg_binddns_dir(service->task->lp_ctx));
 190                         if (path == NULL) {
 191                                 DBG_ERR("Out of memory!");
 192                                 talloc_free(tmp_ctx);
 193                                 return;
 194                         }
 195                 }
 196         }
 197
 198         path_static = lpcfg_parm_string(service->task->lp_ctx, NULL, "dnsupdate", "extra_static_grant_rules");
 199         if (path_static == NULL) {
 200                 path_static = lpcfg_private_path(tmp_ctx,
 201                                                  service->task->lp_ctx,
 202                                                  "named.conf.update.static");
 203                 if (path_static == NULL) {
 204                         DBG_ERR("Out of memory!");
 205                         talloc_free(tmp_ctx);
 206                         return;
 207                 }
 208
 209                 if (!file_exist(path_static)) {
 210                         path_static = talloc_asprintf(tmp_ctx,
 211                                                       "%s/named.conf.update.static",
 212                                                       lpcfg_binddns_dir(service->task->lp_ctx));
 213                         if (path_static == NULL) {
 214                                 DBG_ERR("Out of memory!");
 215                                 talloc_free(tmp_ctx);
 216                                 return;
 217                         }
 218                 }
 219         }
 220
 221         tmp_path = talloc_asprintf(tmp_ctx, "%s.tmp", path);
 222         if (tmp_path == NULL) {
 223                 DEBUG(0,(__location__ ": Unable to get paths\n"));
 224                 talloc_free(tmp_ctx);
 225                 return;
 226         }
 227
 228         static_policies = file_load(path_static, &size, 0, tmp_ctx);
 229
 230         unlink(tmp_path);
 231         fd = open(tmp_path, O_CREAT|O_TRUNC|O_WRONLY, 0444);
 232         if (fd == -1) {
 233                 DEBUG(1,(__location__ ": Unable to open %s - %s\n", tmp_path, strerror(errno)));
 234                 talloc_free(tmp_ctx);
 235                 return;
 236         }
 237
 238         dprintf(fd, "/* this file is auto-generated - do not edit */\n");
 239         dprintf(fd, "update-policy {\n");
 240         if( static_policies != NULL ) {
 241                 dprintf(fd, "/* Start of static entries */\n");
 242                 dprintf(fd, "%s\n",static_policies);
 243                 dprintf(fd, "/* End of static entries */\n");
 244         }
 245         dprintf(fd, "\tgrant %s ms-self * A AAAA;\n", realm);
 246         dprintf(fd, "\tgrant Administrator@%s wildcard * A AAAA SRV CNAME;\n", realm);
 247
 248         for (i=0; i<dc_count; i++) {
 249                 dprintf(fd, "\tgrant %s wildcard * A AAAA SRV CNAME;\n", dc_list[i]);
 250         }
 251         dprintf(fd, "};\n");
 252         close(fd);
 253
 254
 255         if (NT_STATUS_IS_OK(service->confupdate.status) &&
 256             file_compare(tmp_path, path) == true) {
 257                 unlink(tmp_path);
 258                 talloc_free(tmp_ctx);
 259                 return;
 260         }
 261
 262         if (rename(tmp_path, path) != 0) {
 263                 DEBUG(0,(__location__ ": Failed to rename %s to %s - %s\n",
 264                          tmp_path, path, strerror(errno)));
 265                 talloc_free(tmp_ctx);
 266                 return;
 267         }
 268
 269         DEBUG(2,("Loading new DNS update grant rules\n"));
 270         service->confupdate.subreq = samba_runcmd_send(service,
 271                                                        service->task->event_ctx,
 272                                                        timeval_current_ofs(10, 0),
 273                                                        2, 0,
 274                                                        rndc_command,
 275                                                        "reload", NULL);
 276         if (service->confupdate.subreq == NULL) {
 277                 DEBUG(0,(__location__ ": samba_runcmd_send() failed with no memory\n"));
 278                 talloc_free(tmp_ctx);
 279                 return;
 280         }
 281         tevent_req_set_callback(service->confupdate.subreq,
 282                                 dnsupdate_rndc_done,
 283                                 service);
 284
 285         talloc_free(tmp_ctx);
 286 }
 287
 288 static NTSTATUS dnsupdate_confupdate_schedule(struct dnsupdate_service *service);
 289
 290 /*
 291   called every 'dnsupdate:conf interval' seconds
 292  */
 293 static void dnsupdate_confupdate_handler_te(struct tevent_context *ev, struct tevent_timer *te,
 294                                           struct timeval t, void *ptr)
 295 {
 296         struct dnsupdate_service *service = talloc_get_type(ptr, struct dnsupdate_service);
 297
 298         dnsupdate_rebuild(service);
 299         dnsupdate_confupdate_schedule(service);
 300 }
 301
 302
 303 static NTSTATUS dnsupdate_confupdate_schedule(struct dnsupdate_service *service)
 304 {
 305         service->confupdate.te = tevent_add_timer(service->task->event_ctx, service,
 306                                                 timeval_current_ofs(service->confupdate.interval, 0),
 307                                                 dnsupdate_confupdate_handler_te, service);
 308         NT_STATUS_HAVE_NO_MEMORY(service->confupdate.te);
 309         return NT_STATUS_OK;
 310 }
 311
 312
 313 /*
 314   called when dns update script has finished
 315  */
 316 static void dnsupdate_nameupdate_done(struct tevent_req *subreq)
 317 {
 318         struct dnsupdate_service *service = tevent_req_callback_data(subreq,
 319                                             struct dnsupdate_service);
 320         int ret;
 321         int sys_errno;
 322
 323         service->nameupdate.subreq = NULL;
 324
 325         ret = samba_runcmd_recv(subreq, &sys_errno);
 326         TALLOC_FREE(subreq);
 327
 328         if (ret != 0) {
 329                 DEBUG(0,(__location__ ": Failed DNS update - with error code %d\n",
 330                          sys_errno));
 331         } else {
 332                 DEBUG(3,("Completed DNS update check OK\n"));
 333         }
 334 }
 335
 336
 337 /*
 338   called when spn update script has finished
 339  */
 340 static void dnsupdate_spnupdate_done(struct tevent_req *subreq)
 341 {
 342         struct dnsupdate_service *service = tevent_req_callback_data(subreq,
 343                                             struct dnsupdate_service);
 344         int ret;
 345         int sys_errno;
 346
 347         service->nameupdate.spnreq = NULL;
 348
 349         ret = samba_runcmd_recv(subreq, &sys_errno);
 350         TALLOC_FREE(subreq);
 351         if (ret != 0) {
 352                 DEBUG(0,(__location__ ": Failed SPN update - with error code %d\n",
 353                          sys_errno));
 354         } else {
 355                 DEBUG(3,("Completed SPN update check OK\n"));
 356         }
 357 }
 358
 359 /*
 360   called every 'dnsupdate:name interval' seconds
 361  */
 362 static void dnsupdate_check_names(struct dnsupdate_service *service)
 363 {
 364         const char * const *dns_update_command = lpcfg_dns_update_command(service->task->lp_ctx);
 365         const char * const *spn_update_command = lpcfg_spn_update_command(service->task->lp_ctx);
 366
 367         /* kill any existing child */
 368         TALLOC_FREE(service->nameupdate.subreq);
 369
 370         DEBUG(3,("Calling DNS name update script\n"));
 371         service->nameupdate.subreq = samba_runcmd_send(service,
 372                                                        service->task->event_ctx,
 373                                                        timeval_current_ofs(20, 0),
 374                                                        2, 0,
 375                                                        dns_update_command,
 376                                                        NULL);
 377         if (service->nameupdate.subreq == NULL) {
 378                 DEBUG(0,(__location__ ": samba_runcmd_send() failed with no memory\n"));
 379                 return;
 380         }
 381         tevent_req_set_callback(service->nameupdate.subreq,
 382                                 dnsupdate_nameupdate_done,
 383                                 service);
 384
 385         DEBUG(3,("Calling SPN name update script\n"));
 386         service->nameupdate.spnreq = samba_runcmd_send(service,
 387                                                        service->task->event_ctx,
 388                                                        timeval_current_ofs(20, 0),
 389                                                        2, 0,
 390                                                        spn_update_command,
 391                                                        NULL);
 392         if (service->nameupdate.spnreq == NULL) {
 393                 DEBUG(0,(__location__ ": samba_runcmd_send() failed with no memory\n"));
 394                 return;
 395         }
 396         tevent_req_set_callback(service->nameupdate.spnreq,
 397                                 dnsupdate_spnupdate_done,
 398                                 service);
 399 }
 400
 401 static NTSTATUS dnsupdate_nameupdate_schedule(struct dnsupdate_service *service);
 402
 403 /*
 404   called every 'dnsupdate:name interval' seconds
 405  */
 406 static void dnsupdate_nameupdate_handler_te(struct tevent_context *ev, struct tevent_timer *te,
 407                                             struct timeval t, void *ptr)
 408 {
 409         struct dnsupdate_service *service = talloc_get_type(ptr, struct dnsupdate_service);
 410
 411         dnsupdate_check_names(service);
 412         dnsupdate_nameupdate_schedule(service);
 413 }
 414
 415
 416 static NTSTATUS dnsupdate_nameupdate_schedule(struct dnsupdate_service *service)
 417 {
 418         service->nameupdate.te = tevent_add_timer(service->task->event_ctx, service,
 419                                                   timeval_current_ofs(service->nameupdate.interval, 0),
 420                                                   dnsupdate_nameupdate_handler_te, service);
 421         NT_STATUS_HAVE_NO_MEMORY(service->nameupdate.te);
 422         return NT_STATUS_OK;
 423 }
 424
 425
 426 struct dnsupdate_RODC_state {
 427         struct irpc_message *msg;
 428         struct dnsupdate_RODC *r;
 429         char *tmp_path;
 430         char *tmp_path2;
 431         int fd;
 432 };
 433
 434 static int dnsupdate_RODC_destructor(struct dnsupdate_RODC_state *st)
 435 {
 436         if (st->fd != -1) {
 437                 close(st->fd);
 438         }
 439         unlink(st->tmp_path);
 440         if (st->tmp_path2 != NULL) {
 441                 unlink(st->tmp_path2);
 442         }
 443         return 0;
 444 }
 445
 446 /*
 447   called when the DNS update has completed
 448  */
 449 static void dnsupdate_RODC_callback(struct tevent_req *req)
 450 {
 451         struct dnsupdate_RODC_state *st =
 452                 tevent_req_callback_data(req,
 453                                          struct dnsupdate_RODC_state);
 454         int sys_errno;
 455         int i, ret;
 456
 457         ret = samba_runcmd_recv(req, &sys_errno);
 458         talloc_free(req);
 459         if (ret != 0) {
 460                 st->r->out.result = map_nt_error_from_unix_common(sys_errno);
 461                 DEBUG(2,(__location__ ": RODC DNS Update failed: %s\n", nt_errstr(st->r->out.result)));
 462         } else {
 463                 st->r->out.result = NT_STATUS_OK;
 464                 DEBUG(3,(__location__ ": RODC DNS Update OK\n"));
 465         }
 466
 467         for (i=0; i<st->r->in.dns_names->count; i++) {
 468                 st->r->out.dns_names->names[i].status = NT_STATUS_V(st->r->out.result);
 469         }
 470
 471         irpc_send_reply(st->msg, NT_STATUS_OK);
 472 }
 473
 474
 475 /**
 476  * Called when we get a RODC DNS update request from the netlogon
 477  * rpc server
 478  */
 479 static NTSTATUS dnsupdate_dnsupdate_RODC(struct irpc_message *msg,
 480                                          struct dnsupdate_RODC *r)
 481 {
 482         struct dnsupdate_service *s = talloc_get_type(msg->private_data,
 483                                                       struct dnsupdate_service);
 484         const char * const *dns_update_command = lpcfg_dns_update_command(s->task->lp_ctx);
 485         struct dnsupdate_RODC_state *st;
 486         struct tevent_req *req;
 487         int i, ret;
 488         struct GUID ntds_guid;
 489         const char *site, *dnsdomain, *dnsforest, *ntdsguid;
 490         const char *hostname = NULL;
 491         struct ldb_dn *sid_dn;
 492         const char *attrs[] = { "dNSHostName", NULL };
 493         struct ldb_result *res;
 494
 495         st = talloc_zero(msg, struct dnsupdate_RODC_state);
 496         if (!st) {
 497                 r->out.result = NT_STATUS_NO_MEMORY;
 498                 return NT_STATUS_OK;
 499         }
 500
 501         st->r = r;
 502         st->msg = msg;
 503
 504         st->tmp_path = smbd_tmp_path(st, s->task->lp_ctx, "rodcdns.XXXXXX");
 505         if (!st->tmp_path) {
 506                 talloc_free(st);
 507                 r->out.result = NT_STATUS_NO_MEMORY;
 508                 return NT_STATUS_OK;
 509         }
 510
 511         st->fd = mkstemp(st->tmp_path);
 512         if (st->fd == -1) {
 513                 DEBUG(0,("Unable to create a temporary file for RODC dnsupdate\n"));
 514                 talloc_free(st);
 515                 r->out.result = NT_STATUS_INTERNAL_DB_CORRUPTION;
 516                 return NT_STATUS_OK;
 517         }
 518
 519         talloc_set_destructor(st, dnsupdate_RODC_destructor);
 520
 521         st->tmp_path2 = talloc_asprintf(st, "%s.cache", st->tmp_path);
 522         if (!st->tmp_path2) {
 523                 talloc_free(st);
 524                 r->out.result = NT_STATUS_NO_MEMORY;
 525                 return NT_STATUS_OK;
 526         }
 527
 528         sid_dn = ldb_dn_new_fmt(st, s->samdb, "<SID=%s>", dom_sid_string(st, r->in.dom_sid));
 529         if (!sid_dn) {
 530                 talloc_free(st);
 531                 r->out.result = NT_STATUS_NO_MEMORY;
 532                 return NT_STATUS_OK;
 533         }
 534
 535         /* work out the site */
 536         ret = samdb_find_site_for_computer(s->samdb, st, sid_dn, &site);
 537         if (ret != LDB_SUCCESS) {
 538                 DEBUG(2, (__location__ ": Unable to find site for computer %s\n",
 539                           ldb_dn_get_linearized(sid_dn)));
 540                 talloc_free(st);
 541                 r->out.result = NT_STATUS_NO_SUCH_USER;
 542                 return NT_STATUS_OK;
 543         }
 544
 545         /* work out the ntdsguid */
 546         ret = samdb_find_ntdsguid_for_computer(s->samdb, sid_dn, &ntds_guid);
 547         ntdsguid = GUID_string(st, &ntds_guid);
 548         if (ret != LDB_SUCCESS || !ntdsguid) {
 549                 DEBUG(2, (__location__ ": Unable to find NTDS GUID for computer %s\n",
 550                           ldb_dn_get_linearized(sid_dn)));
 551                 talloc_free(st);
 552                 r->out.result = NT_STATUS_NO_SUCH_USER;
 553                 return NT_STATUS_OK;
 554         }
 555
 556
 557         /* find dnsdomain and dnsforest */
 558         dnsdomain = lpcfg_dnsdomain(s->task->lp_ctx);
 559         dnsforest = dnsdomain;
 560
 561         /* find the hostname */
 562         ret = dsdb_search_dn(s->samdb, st, &res, sid_dn, attrs, 0);
 563         if (ret == LDB_SUCCESS) {
 564                 hostname = ldb_msg_find_attr_as_string(res->msgs[0], "dNSHostName", NULL);
 565         }
 566         if (ret != LDB_SUCCESS || !hostname) {
 567                 DEBUG(2, (__location__ ": Unable to find NTDS GUID for computer %s\n",
 568                           ldb_dn_get_linearized(sid_dn)));
 569                 talloc_free(st);
 570                 r->out.result = NT_STATUS_NO_SUCH_USER;
 571                 return NT_STATUS_OK;
 572         }
 573
 574         for (i=0; i<st->r->in.dns_names->count; i++) {
 575                 struct NL_DNS_NAME_INFO *n = &r->in.dns_names->names[i];
 576                 switch (n->type) {
 577                 case NlDnsLdapAtSite:
 578                         dprintf(st->fd, "SRV _ldap._tcp.%s._sites.%s %s %u\n",
 579                                 site, dnsdomain, hostname, n->port);
 580                         break;
 581                 case NlDnsGcAtSite:
 582                         dprintf(st->fd, "SRV _ldap._tcp.%s._sites.gc._msdcs.%s %s %u\n",
 583                                 site, dnsdomain, hostname, n->port);
 584                         break;
 585                 case NlDnsDsaCname:
 586                         dprintf(st->fd, "CNAME %s._msdcs.%s %s\n",
 587                                 ntdsguid, dnsforest, hostname);
 588                         break;
 589                 case NlDnsKdcAtSite:
 590                         dprintf(st->fd, "SRV _kerberos._tcp.%s._sites.dc._msdcs.%s %s %u\n",
 591                                 site, dnsdomain, hostname, n->port);
 592                         break;
 593                 case NlDnsDcAtSite:
 594                         dprintf(st->fd, "SRV _ldap._tcp.%s._sites.dc._msdcs.%s %s %u\n",
 595                                 site, dnsdomain, hostname, n->port);
 596                         break;
 597                 case NlDnsRfc1510KdcAtSite:
 598                         dprintf(st->fd, "SRV _kerberos._tcp.%s._sites.%s %s %u\n",
 599                                 site, dnsdomain, hostname, n->port);
 600                         break;
 601                 case NlDnsGenericGcAtSite:
 602                         dprintf(st->fd, "SRV _gc._tcp.%s._sites.%s %s %u\n",
 603                                 site, dnsforest, hostname, n->port);
 604                         break;
 605                 }
 606         }
 607
 608         close(st->fd);
 609         st->fd = -1;
 610
 611         DEBUG(3,("Calling RODC DNS name update script %s\n", st->tmp_path));
 612         req = samba_runcmd_send(st,
 613                                 s->task->event_ctx,
 614                                 timeval_current_ofs(20, 0),
 615                                 2, 0,
 616                                 dns_update_command,
 617                                 "--update-list",
 618                                 st->tmp_path,
 619                                 "--update-cache",
 620                                 st->tmp_path2,
 621                                 NULL);
 622         NT_STATUS_HAVE_NO_MEMORY(req);
 623
 624         /* setup the callback */
 625         tevent_req_set_callback(req, dnsupdate_RODC_callback, st);
 626
 627         msg->defer_reply = true;
 628
 629         return NT_STATUS_OK;
 630 }
 631
 632 /*
 633   startup the dns update task
 634 */
 635 static void dnsupdate_task_init(struct task_server *task)
 636 {
 637         NTSTATUS status;
 638         struct dnsupdate_service *service;
 639
 640         if (lpcfg_server_role(task->lp_ctx) != ROLE_ACTIVE_DIRECTORY_DC) {
 641                 /* not useful for non-DC */
 642                 return;
 643         }
 644
 645         task_server_set_title(task, "task[dnsupdate]");
 646
 647         service = talloc_zero(task, struct dnsupdate_service);
 648         if (!service) {
 649                 task_server_terminate(task, "dnsupdate_task_init: out of memory", true);
 650                 return;
 651         }
 652         service->task           = task;
 653         task->private_data      = service;
 654
 655         service->system_session_info = system_session(service->task->lp_ctx);
 656         if (!service->system_session_info) {
 657                 task_server_terminate(task,
 658                                       "dnsupdate: Failed to obtain server credentials\n",
 659                                       true);
 660                 return;
 661         }
 662
 663         service->samdb = samdb_connect(service,
 664                                        service->task->event_ctx,
 665                                        task->lp_ctx,
 666                                        service->system_session_info,
 667                                        NULL,
 668                                        0);
 669         if (!service->samdb) {
 670                 task_server_terminate(task, "dnsupdate: Failed to connect to local samdb\n",
 671                                       true);
 672                 return;
 673         }
 674
 675         service->confupdate.interval    = lpcfg_parm_int(task->lp_ctx, NULL,
 676                                                       "dnsupdate", "config interval", 60); /* in seconds */
 677
 678         service->nameupdate.interval    = lpcfg_parm_int(task->lp_ctx, NULL,
 679                                                       "dnsupdate", "name interval", 600); /* in seconds */
 680
 681         dnsupdate_rebuild(service);
 682         status = dnsupdate_confupdate_schedule(service);
 683         if (!NT_STATUS_IS_OK(status)) {
 684                 task_server_terminate(task, talloc_asprintf(task,
 685                                       "dnsupdate: Failed to confupdate schedule: %s\n",
 686                                                             nt_errstr(status)), true);
 687                 return;
 688         }
 689
 690         dnsupdate_check_names(service);
 691         status = dnsupdate_nameupdate_schedule(service);
 692         if (!NT_STATUS_IS_OK(status)) {
 693                 task_server_terminate(task, talloc_asprintf(task,
 694                                       "dnsupdate: Failed to nameupdate schedule: %s\n",
 695                                                             nt_errstr(status)), true);
 696                 return;
 697         }
 698
 699         irpc_add_name(task->msg_ctx, "dnsupdate");
 700
 701         IRPC_REGISTER(task->msg_ctx, irpc, DNSUPDATE_RODC,
 702                       dnsupdate_dnsupdate_RODC, service);
 703
 704         /* create the intial file */
 705         dnsupdate_rebuild(service);
 706
 707 }
 708
 709 /*
 710   register ourselves as a available server
 711 */
 712 NTSTATUS server_service_dnsupdate_init(TALLOC_CTX *ctx)
 713 {
 714         struct service_details details = {
 715                 .inhibit_fork_on_accept = true,
 716                 .inhibit_pre_fork = true,
 717         };
 718         return register_server_service(ctx, "dnsupdate", dnsupdate_task_init,
 719                                        &details);
 720 }