source4/dsdb/repl/drepl_notify.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3
   4    DSDB replication service periodic notification handling
   5
   6    Copyright (C) Andrew Tridgell 2009
   7    based on drepl_periodic
   8
   9    This program is free software; you can redistribute it and/or modify
  10    it under the terms of the GNU General Public License as published by
  11    the Free Software Foundation; either version 3 of the License, or
  12    (at your option) any later version.
  13
  14    This program is distributed in the hope that it will be useful,
  15    but WITHOUT ANY WARRANTY; without even the implied warranty of
  16    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17    GNU General Public License for more details.
  18
  19    You should have received a copy of the GNU General Public License
  20    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 */
  23
  24 #include "includes.h"
  25 #include "lib/events/events.h"
  26 #include "dsdb/samdb/samdb.h"
  27 #include "auth/auth.h"
  28 #include "smbd/service.h"
  29 #include "lib/messaging/irpc.h"
  30 #include "dsdb/repl/drepl_service.h"
  31 #include "lib/ldb/include/ldb_errors.h"
  32 #include "../lib/util/dlinklist.h"
  33 #include "librpc/gen_ndr/ndr_misc.h"
  34 #include "librpc/gen_ndr/ndr_drsuapi.h"
  35 #include "librpc/gen_ndr/ndr_drsblobs.h"
  36 #include "libcli/composite/composite.h"
  37
  38
  39 struct dreplsrv_op_notify_state {
  40         struct composite_context *creq;
  41
  42         struct dreplsrv_out_connection *conn;
  43
  44         struct dreplsrv_drsuapi_connection *drsuapi;
  45
  46         struct drsuapi_DsBindInfoCtr bind_info_ctr;
  47         struct drsuapi_DsBind bind_r;
  48         struct dreplsrv_notify_operation *op;
  49 };
  50
  51 /*
  52   receive a DsReplicaSync reply
  53  */
  54 static void dreplsrv_op_notify_replica_sync_recv(struct rpc_request *req)
  55 {
  56         struct dreplsrv_op_notify_state *st = talloc_get_type(req->async.private_data,
  57                                                               struct dreplsrv_op_notify_state);
  58         struct composite_context *c = st->creq;
  59         struct drsuapi_DsReplicaSync *r = talloc_get_type(req->ndr.struct_ptr,
  60                                                           struct drsuapi_DsReplicaSync);
  61
  62         c->status = dcerpc_ndr_request_recv(req);
  63         if (!composite_is_ok(c)) return;
  64
  65         if (!W_ERROR_IS_OK(r->out.result)) {
  66                 composite_error(c, werror_to_ntstatus(r->out.result));
  67                 return;
  68         }
  69
  70         composite_done(c);
  71 }
  72
  73 /*
  74   send a DsReplicaSync
  75 */
  76 static void dreplsrv_op_notify_replica_sync_send(struct dreplsrv_op_notify_state *st)
  77 {
  78         struct composite_context *c = st->creq;
  79         struct dreplsrv_partition *partition = st->op->source_dsa->partition;
  80         struct dreplsrv_drsuapi_connection *drsuapi = st->op->source_dsa->conn->drsuapi;
  81         struct rpc_request *req;
  82         struct drsuapi_DsReplicaSync *r;
  83
  84         r = talloc_zero(st, struct drsuapi_DsReplicaSync);
  85         if (composite_nomem(r, c)) return;
  86
  87         r->in.bind_handle       = &drsuapi->bind_handle;
  88         r->in.level = 1;
  89         r->in.req.req1.naming_context = &partition->nc;
  90         r->in.req.req1.source_dsa_guid = st->op->service->ntds_guid;
  91         r->in.req.req1.options =
  92                 DRSUAPI_DS_REPLICA_SYNC_ASYNCHRONOUS_OPERATION |
  93                 DRSUAPI_DS_REPLICA_SYNC_WRITEABLE |
  94                 DRSUAPI_DS_REPLICA_SYNC_ALL_SOURCES;
  95
  96
  97         req = dcerpc_drsuapi_DsReplicaSync_send(drsuapi->pipe, r, r);
  98         composite_continue_rpc(c, req, dreplsrv_op_notify_replica_sync_recv, st);
  99 }
 100
 101 /*
 102   called when we have an established connection
 103  */
 104 static void dreplsrv_op_notify_connect_recv(struct composite_context *creq)
 105 {
 106         struct dreplsrv_op_notify_state *st = talloc_get_type(creq->async.private_data,
 107                                                               struct dreplsrv_op_notify_state);
 108         struct composite_context *c = st->creq;
 109
 110         c->status = dreplsrv_out_drsuapi_recv(creq);
 111         if (!composite_is_ok(c)) return;
 112
 113         dreplsrv_op_notify_replica_sync_send(st);
 114 }
 115
 116 /*
 117   start the ReplicaSync async call
 118  */
 119 static struct composite_context *dreplsrv_op_notify_send(struct dreplsrv_notify_operation *op)
 120 {
 121         struct composite_context *c;
 122         struct composite_context *creq;
 123         struct dreplsrv_op_notify_state *st;
 124
 125         c = composite_create(op, op->service->task->event_ctx);
 126         if (c == NULL) return NULL;
 127
 128         st = talloc_zero(c, struct dreplsrv_op_notify_state);
 129         if (composite_nomem(st, c)) return c;
 130
 131         st->creq        = c;
 132         st->op          = op;
 133
 134         creq = dreplsrv_out_drsuapi_send(op->source_dsa->conn);
 135         composite_continue(c, creq, dreplsrv_op_notify_connect_recv, st);
 136
 137         return c;
 138 }
 139
 140 static void dreplsrv_notify_del_repsTo(struct dreplsrv_notify_operation *op)
 141 {
 142         uint32_t count;
 143         struct repsFromToBlob *reps;
 144         WERROR werr;
 145         struct dreplsrv_service *s = op->service;
 146         int i;
 147
 148         werr = dsdb_loadreps(s->samdb, op, op->source_dsa->partition->dn, "repsTo", &reps, &count);
 149         if (!W_ERROR_IS_OK(werr)) {
 150                 DEBUG(0,(__location__ ": Failed to load repsTo for %s\n",
 151                          ldb_dn_get_linearized(op->source_dsa->partition->dn)));
 152                 return;
 153         }
 154
 155         for (i=0; i<count; i++) {
 156                 if (GUID_compare(&reps[i].ctr.ctr1.source_dsa_obj_guid,
 157                                  &op->source_dsa->repsFrom1->source_dsa_obj_guid) == 0) {
 158                         memmove(&reps[i], &reps[i+1],
 159                                 sizeof(reps[i])*(count-(i+1)));
 160                         count--;
 161                 }
 162         }
 163
 164         werr = dsdb_savereps(s->samdb, op, op->source_dsa->partition->dn, "repsTo", reps, count);
 165         if (!W_ERROR_IS_OK(werr)) {
 166                 DEBUG(0,(__location__ ": Failed to save repsTo for %s\n",
 167                          ldb_dn_get_linearized(op->source_dsa->partition->dn)));
 168                 return;
 169         }
 170 }
 171
 172 /*
 173   called when a notify operation has completed
 174  */
 175 static void dreplsrv_notify_op_callback(struct dreplsrv_notify_operation *op)
 176 {
 177         NTSTATUS status;
 178         struct dreplsrv_service *s = op->service;
 179
 180         status = composite_wait(op->creq);
 181         if (!NT_STATUS_IS_OK(status)) {
 182                 DEBUG(0,("dreplsrv_notify: Failed to send DsReplicaSync to %s - %s\n",
 183                          op->source_dsa->repsFrom1->other_info->dns_name,
 184                          nt_errstr(status)));
 185         } else {
 186                 DEBUG(2,("dreplsrv_notify: DsReplicaSync OK for %s\n",
 187                          op->source_dsa->repsFrom1->other_info->dns_name));
 188                 op->source_dsa->notify_uSN = op->uSN;
 189                 /* delete the repsTo for this replication partner in the
 190                    partition, as we have successfully told him to sync */
 191                 dreplsrv_notify_del_repsTo(op);
 192         }
 193         talloc_free(op->creq);
 194
 195         talloc_free(op);
 196         s->ops.n_current = NULL;
 197         dreplsrv_notify_run_ops(s);
 198 }
 199
 200
 201 static void dreplsrv_notify_op_callback_creq(struct composite_context *creq)
 202 {
 203         struct dreplsrv_notify_operation *op = talloc_get_type(creq->async.private_data,
 204                                                                struct dreplsrv_notify_operation);
 205         dreplsrv_notify_op_callback(op);
 206 }
 207
 208 /*
 209   run any pending replica sync calls
 210  */
 211 void dreplsrv_notify_run_ops(struct dreplsrv_service *s)
 212 {
 213         struct dreplsrv_notify_operation *op;
 214
 215         if (s->ops.n_current || s->ops.current) {
 216                 /* if there's still one running, we're done */
 217                 return;
 218         }
 219
 220         if (!s->ops.notifies) {
 221                 /* if there're no pending operations, we're done */
 222                 return;
 223         }
 224
 225         op = s->ops.notifies;
 226         s->ops.n_current = op;
 227         DLIST_REMOVE(s->ops.notifies, op);
 228
 229         op->creq = dreplsrv_op_notify_send(op);
 230         if (!op->creq) {
 231                 dreplsrv_notify_op_callback(op);
 232                 return;
 233         }
 234
 235         op->creq->async.fn              = dreplsrv_notify_op_callback_creq;
 236         op->creq->async.private_data    = op;
 237 }
 238
 239
 240 /*
 241   find a source_dsa for a given guid
 242  */
 243 static struct dreplsrv_partition_source_dsa *dreplsrv_find_source_dsa(struct dreplsrv_partition *p,
 244                                                                       struct GUID *guid)
 245 {
 246         struct dreplsrv_partition_source_dsa *s;
 247
 248         for (s=p->sources; s; s=s->next) {
 249                 if (GUID_compare(&s->repsFrom1->source_dsa_obj_guid, guid) == 0) {
 250                         return s;
 251                 }
 252         }
 253         return NULL;
 254 }
 255
 256
 257 /*
 258   schedule a replicaSync message
 259  */
 260 static WERROR dreplsrv_schedule_notify_sync(struct dreplsrv_service *service,
 261                                             struct dreplsrv_partition *p,
 262                                             struct repsFromToBlob *reps,
 263                                             TALLOC_CTX *mem_ctx,
 264                                             uint64_t uSN)
 265 {
 266         struct dreplsrv_notify_operation *op;
 267         struct dreplsrv_partition_source_dsa *s;
 268
 269         s = dreplsrv_find_source_dsa(p, &reps->ctr.ctr1.source_dsa_obj_guid);
 270         if (s == NULL) {
 271                 DEBUG(0,(__location__ ": Unable to find source_dsa for %s\n",
 272                          GUID_string(mem_ctx, &reps->ctr.ctr1.source_dsa_obj_guid)));
 273                 return WERR_DS_UNAVAILABLE;
 274         }
 275
 276         op = talloc_zero(mem_ctx, struct dreplsrv_notify_operation);
 277         W_ERROR_HAVE_NO_MEMORY(op);
 278
 279         op->service     = service;
 280         op->source_dsa  = s;
 281         op->uSN         = uSN;
 282
 283         DLIST_ADD_END(service->ops.notifies, op, struct dreplsrv_notify_operation *);
 284         talloc_steal(service, op);
 285         return WERR_OK;
 286 }
 287
 288 /*
 289   see if a partition has a hugher uSN than what is in the repsTo and
 290   if so then send a DsReplicaSync
 291  */
 292 static WERROR dreplsrv_notify_check(struct dreplsrv_service *s,
 293                                     struct dreplsrv_partition *p,
 294                                     TALLOC_CTX *mem_ctx)
 295 {
 296         uint32_t count;
 297         struct repsFromToBlob *reps;
 298         WERROR werr;
 299         uint64_t uSN;
 300         int ret, i;
 301
 302         werr = dsdb_loadreps(s->samdb, mem_ctx, p->dn, "repsTo", &reps, &count);
 303         if (!W_ERROR_IS_OK(werr)) {
 304                 DEBUG(0,(__location__ ": Failed to load repsTo for %s\n",
 305                          ldb_dn_get_linearized(p->dn)));
 306                 return werr;
 307         }
 308
 309         /* loads the partition uSNHighest */
 310         ret = dsdb_load_partition_usn(s->samdb, p->dn, &uSN);
 311         if (ret != LDB_SUCCESS || uSN == 0) {
 312                 /* nothing to do */
 313                 return WERR_OK;
 314         }
 315
 316         /* see if any of our partners need some of our objects */
 317         for (i=0; i<count; i++) {
 318                 struct dreplsrv_partition_source_dsa *sdsa;
 319                 sdsa = dreplsrv_find_source_dsa(p, &reps[i].ctr.ctr1.source_dsa_obj_guid);
 320                 if (sdsa == NULL) continue;
 321                 if (sdsa->notify_uSN < uSN) {
 322                         /* we need to tell this partner to replicate
 323                            with us */
 324                         werr = dreplsrv_schedule_notify_sync(s, p, &reps[i], mem_ctx, uSN);
 325                         if (!W_ERROR_IS_OK(werr)) {
 326                                 DEBUG(0,(__location__ ": Failed to setup notify to %s for %s\n",
 327                                          reps[i].ctr.ctr1.other_info->dns_name,
 328                                          ldb_dn_get_linearized(p->dn)));
 329                                 return werr;
 330                         }
 331                 }
 332         }
 333
 334
 335         return WERR_OK;
 336 }
 337
 338 /*
 339   see if any of the partitions have changed, and if so then send a
 340   DsReplicaSync to all the replica partners in the repsTo object
 341  */
 342 static WERROR dreplsrv_notify_check_all(struct dreplsrv_service *s, TALLOC_CTX *mem_ctx)
 343 {
 344         WERROR status;
 345         struct dreplsrv_partition *p;
 346
 347         for (p = s->partitions; p; p = p->next) {
 348                 status = dreplsrv_notify_check(s, p, mem_ctx);
 349                 W_ERROR_NOT_OK_RETURN(status);
 350         }
 351
 352         return WERR_OK;
 353 }
 354
 355 static void dreplsrv_notify_run(struct dreplsrv_service *service);
 356
 357 static void dreplsrv_notify_handler_te(struct tevent_context *ev, struct tevent_timer *te,
 358                                        struct timeval t, void *ptr)
 359 {
 360         struct dreplsrv_service *service = talloc_get_type(ptr, struct dreplsrv_service);
 361         WERROR status;
 362
 363         service->notify.te = NULL;
 364
 365         dreplsrv_notify_run(service);
 366
 367         status = dreplsrv_notify_schedule(service, service->notify.interval);
 368         if (!W_ERROR_IS_OK(status)) {
 369                 task_server_terminate(service->task, win_errstr(status));
 370                 return;
 371         }
 372 }
 373
 374 WERROR dreplsrv_notify_schedule(struct dreplsrv_service *service, uint32_t next_interval)
 375 {
 376         TALLOC_CTX *tmp_mem;
 377         struct tevent_timer *new_te;
 378         struct timeval next_time;
 379
 380         /* prevent looping */
 381         if (next_interval == 0) next_interval = 1;
 382
 383         next_time = timeval_current_ofs(next_interval, 50);
 384
 385         if (service->notify.te) {
 386                 /*
 387                  * if the timestamp of the new event is higher,
 388                  * as current next we don't need to reschedule
 389                  */
 390                 if (timeval_compare(&next_time, &service->notify.next_event) > 0) {
 391                         return WERR_OK;
 392                 }
 393         }
 394
 395         /* reset the next scheduled timestamp */
 396         service->notify.next_event = next_time;
 397
 398         new_te = event_add_timed(service->task->event_ctx, service,
 399                                  service->notify.next_event,
 400                                  dreplsrv_notify_handler_te, service);
 401         W_ERROR_HAVE_NO_MEMORY(new_te);
 402
 403         tmp_mem = talloc_new(service);
 404         DEBUG(2,("dreplsrv_notify_schedule(%u) %sscheduled for: %s\n",
 405                 next_interval,
 406                 (service->notify.te?"re":""),
 407                 nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
 408         talloc_free(tmp_mem);
 409
 410         talloc_free(service->notify.te);
 411         service->notify.te = new_te;
 412
 413         return WERR_OK;
 414 }
 415
 416 static void dreplsrv_notify_run(struct dreplsrv_service *service)
 417 {
 418         TALLOC_CTX *mem_ctx;
 419
 420         mem_ctx = talloc_new(service);
 421         dreplsrv_notify_check_all(service, mem_ctx);
 422         talloc_free(mem_ctx);
 423
 424         dreplsrv_run_pending_ops(service);
 425         dreplsrv_notify_run_ops(service);
 426 }