source4/dsdb/repl/drepl_periodic.c

   1 /*
   2    Unix SMB/CIFS Implementation.
   3    DSDB replication service periodic handling
   4
   5    Copyright (C) Stefan Metzmacher 2007
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  19
  20 */
  21
  22 #include "includes.h"
  23 #include "lib/events/events.h"
  24 #include "dsdb/samdb/samdb.h"
  25 #include "auth/auth.h"
  26 #include "samba/service.h"
  27 #include "dsdb/repl/drepl_service.h"
  28 #include <ldb_errors.h>
  29 #include "../lib/util/dlinklist.h"
  30 #include "librpc/gen_ndr/ndr_misc.h"
  31 #include "librpc/gen_ndr/ndr_drsuapi.h"
  32 #include "librpc/gen_ndr/ndr_drsblobs.h"
  33
  34 #undef DBGC_CLASS
  35 #define DBGC_CLASS            DBGC_DRS_REPL
  36
  37 static void dreplsrv_periodic_run(struct dreplsrv_service *service);
  38
  39 static void dreplsrv_periodic_handler_te(struct tevent_context *ev, struct tevent_timer *te,
  40                                          struct timeval t, void *ptr)
  41 {
  42         struct dreplsrv_service *service = talloc_get_type(ptr, struct dreplsrv_service);
  43         WERROR status;
  44
  45         service->periodic.te = NULL;
  46
  47         dreplsrv_periodic_run(service);
  48
  49         status = dreplsrv_periodic_schedule(service, service->periodic.interval);
  50         if (!W_ERROR_IS_OK(status)) {
  51                 task_server_terminate(service->task, win_errstr(status), false);
  52                 return;
  53         }
  54 }
  55
  56 WERROR dreplsrv_periodic_schedule(struct dreplsrv_service *service, uint32_t next_interval)
  57 {
  58         TALLOC_CTX *tmp_mem;
  59         struct tevent_timer *new_te;
  60         struct timeval next_time;
  61
  62         /* prevent looping */
  63         if (next_interval == 0) next_interval = 1;
  64
  65         next_time = timeval_current_ofs(next_interval, 50);
  66
  67         if (service->periodic.te) {
  68                 /*
  69                  * if the timestamp of the new event is higher,
  70                  * as current next we don't need to reschedule
  71                  */
  72                 if (timeval_compare(&next_time, &service->periodic.next_event) > 0) {
  73                         return WERR_OK;
  74                 }
  75         }
  76
  77         /* reset the next scheduled timestamp */
  78         service->periodic.next_event = next_time;
  79
  80         new_te = tevent_add_timer(service->task->event_ctx, service,
  81                                  service->periodic.next_event,
  82                                  dreplsrv_periodic_handler_te, service);
  83         W_ERROR_HAVE_NO_MEMORY(new_te);
  84
  85         tmp_mem = talloc_new(service);
  86         DEBUG(4,("dreplsrv_periodic_schedule(%u) %sscheduled for: %s\n",
  87                 next_interval,
  88                 (service->periodic.te?"re":""),
  89                 nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
  90         talloc_free(tmp_mem);
  91
  92         talloc_free(service->periodic.te);
  93         service->periodic.te = new_te;
  94
  95         return WERR_OK;
  96 }
  97
  98 static void dreplsrv_periodic_run(struct dreplsrv_service *service)
  99 {
 100         TALLOC_CTX *mem_ctx;
 101
 102         DEBUG(4,("dreplsrv_periodic_run(): schedule pull replication\n"));
 103
 104         /*
 105          * KCC or some administrative tool
 106          * might have changed Topology graph
 107          * i.e. repsFrom/repsTo
 108          */
 109         dreplsrv_refresh_partitions(service);
 110
 111         mem_ctx = talloc_new(service);
 112         dreplsrv_schedule_pull_replication(service, mem_ctx);
 113         talloc_free(mem_ctx);
 114
 115         DEBUG(4,("dreplsrv_periodic_run(): run pending_ops memory=%u\n",
 116                  (unsigned)talloc_total_blocks(service)));
 117
 118         dreplsrv_ridalloc_check_rid_pool(service);
 119
 120         dreplsrv_run_pending_ops(service);
 121 }
 122
 123 /*
 124   run the next pending op, either a notify or a pull
 125  */
 126 void dreplsrv_run_pending_ops(struct dreplsrv_service *s)
 127 {
 128         if (!s->ops.notifies && !s->ops.pending) {
 129                 return;
 130         }
 131         if (!s->ops.notifies ||
 132             (s->ops.pending &&
 133              s->ops.notifies->schedule_time > s->ops.pending->schedule_time)) {
 134                 dreplsrv_run_pull_ops(s);
 135         } else {
 136                 dreplsrv_notify_run_ops(s);
 137         }
 138 }
 139
 140 static void dreplsrv_pending_pull_handler_im(struct tevent_context *ev,
 141                                              struct tevent_immediate *im,
 142                                              void *ptr)
 143 {
 144         struct dreplsrv_service *service = talloc_get_type(ptr, struct dreplsrv_service);
 145
 146         dreplsrv_run_pull_ops(service);
 147 }
 148
 149 void dreplsrv_pendingops_schedule_pull_now(struct dreplsrv_service *service)
 150 {
 151         tevent_schedule_immediate(service->pending.im, service->task->event_ctx,
 152                                   dreplsrv_pending_pull_handler_im,
 153                                   service);
 154
 155         return;
 156 }
 157