source4/dsdb/repl/drepl_service.c

   1 /*
   2    Unix SMB/CIFS mplementation.
   3    DSDB replication service
   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 2 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, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20
  21 */
  22
  23 #include "includes.h"
  24 #include "dsdb/samdb/samdb.h"
  25 #include "auth/auth.h"
  26 #include "smbd/service.h"
  27 #include "lib/events/events.h"
  28 #include "lib/messaging/irpc.h"
  29 #include "dsdb/repl/drepl_service.h"
  30 #include "lib/ldb/include/ldb_errors.h"
  31 #include "lib/util/dlinklist.h"
  32 #include "librpc/gen_ndr/ndr_misc.h"
  33 #include "librpc/gen_ndr/ndr_drsuapi.h"
  34 #include "librpc/gen_ndr/ndr_drsblobs.h"
  35
  36 static WERROR dreplsrv_init_creds(struct dreplsrv_service *service)
  37 {
  38         NTSTATUS status;
  39
  40         status = auth_system_session_info(service, &service->system_session_info);
  41         if (!NT_STATUS_IS_OK(status)) {
  42                 return ntstatus_to_werror(status);
  43         }
  44
  45         return WERR_OK;
  46 }
  47
  48 static WERROR dreplsrv_connect_samdb(struct dreplsrv_service *service)
  49 {
  50         service->samdb = samdb_connect(service, service->system_session_info);
  51         if (!service->samdb) {
  52                 return WERR_DS_SERVICE_UNAVAILABLE;
  53         }
  54
  55         return WERR_OK;
  56 }
  57
  58 static void dreplsrv_periodic_handler_te(struct event_context *ev, struct timed_event *te,
  59                                          struct timeval t, void *ptr)
  60 {
  61         struct dreplsrv_service *service = talloc_get_type(ptr, struct dreplsrv_service);
  62         WERROR status;
  63
  64         service->periodic.te = NULL;
  65
  66         status = dreplsrv_periodic_schedule(service, service->periodic.interval);
  67         if (!W_ERROR_IS_OK(status)) {
  68                 task_server_terminate(service->task, win_errstr(status));
  69                 return;
  70         }
  71 }
  72
  73 WERROR dreplsrv_periodic_schedule(struct dreplsrv_service *service, uint32_t next_interval)
  74 {
  75         TALLOC_CTX *tmp_mem;
  76         struct timed_event *new_te;
  77         struct timeval next_time;
  78
  79         /* prevent looping */
  80         if (next_interval == 0) next_interval = 1;
  81
  82         next_time = timeval_current_ofs(next_interval, 5000);
  83
  84         if (service->periodic.te) {
  85                 /*
  86                  * if the timestamp of the new event is higher,
  87                  * as current next we don't need to reschedule
  88                  */
  89                 if (timeval_compare(&next_time, &service->periodic.next_event) > 0) {
  90                         return WERR_OK;
  91                 }
  92         }
  93
  94         /* reset the next scheduled timestamp */
  95         service->periodic.next_event = next_time;
  96
  97         new_te = event_add_timed(service->task->event_ctx, service,
  98                                  service->periodic.next_event,
  99                                  dreplsrv_periodic_handler_te, service);
 100         W_ERROR_HAVE_NO_MEMORY(new_te);
 101
 102         tmp_mem = talloc_new(service);
 103         DEBUG(4,("dreplsrv_periodic_schedule(%u) %sscheduled for: %s\n",
 104                 next_interval,
 105                 (service->periodic.te?"re":""),
 106                 nt_time_string(tmp_mem, timeval_to_nttime(&next_time))));
 107         talloc_free(tmp_mem);
 108
 109         talloc_free(service->periodic.te);
 110         service->periodic.te = new_te;
 111
 112         return WERR_OK;
 113 }
 114 /*
 115   startup the dsdb replicator service task
 116 */
 117 static void dreplsrv_task_init(struct task_server *task)
 118 {
 119         WERROR status;
 120         struct dreplsrv_service *service;
 121
 122         switch (lp_server_role()) {
 123         case ROLE_STANDALONE:
 124                 task_server_terminate(task, "dreplsrv: no DSDB replication required in standalone configuration");
 125                 return;
 126         case ROLE_DOMAIN_MEMBER:
 127                 task_server_terminate(task, "dreplsrv: no DSDB replication required in domain member configuration");
 128                 return;
 129         case ROLE_DOMAIN_CONTROLLER:
 130                 /* Yes, we want DSDB replication */
 131                 break;
 132         }
 133
 134         task_server_set_title(task, "task[dreplsrv]");
 135
 136         service = talloc_zero(task, struct dreplsrv_service);
 137         if (!service) {
 138                 task_server_terminate(task, "dreplsrv_task_init: out of memory");
 139                 return;
 140         }
 141         service->task           = task;
 142         service->startup_time   = timeval_current();
 143         task->private           = service;
 144
 145         status = dreplsrv_init_creds(service);
 146         if (!W_ERROR_IS_OK(status)) {
 147                 task_server_terminate(task, talloc_asprintf(task,
 148                                       "dreplsrv: Failed to obtain server credentials: %s\n",
 149                                       win_errstr(status)));
 150                 return;
 151         }
 152
 153         status = dreplsrv_connect_samdb(service);
 154         if (!W_ERROR_IS_OK(status)) {
 155                 task_server_terminate(task, talloc_asprintf(task,
 156                                       "dreplsrv: Failed to connect to local samdb: %s\n",
 157                                       win_errstr(status)));
 158                 return;
 159         }
 160
 161         service->periodic.interval      = 30; /* in seconds */
 162
 163         status = dreplsrv_periodic_schedule(service, service->periodic.interval);
 164         if (!W_ERROR_IS_OK(status)) {
 165                 task_server_terminate(task, talloc_asprintf(task,
 166                                       "dreplsrv: Failed to periodic schedule: %s\n",
 167                                       win_errstr(status)));
 168                 return;
 169         }
 170
 171         irpc_add_name(task->msg_ctx, "dreplsrv");
 172 }
 173
 174 /*
 175   initialise the dsdb replicator service
 176  */
 177 static NTSTATUS dreplsrv_init(struct event_context *event_ctx, const struct model_ops *model_ops)
 178 {
 179         return task_server_startup(event_ctx, model_ops, dreplsrv_task_init);
 180 }
 181
 182 /*
 183   register ourselves as a available server
 184 */
 185 NTSTATUS server_service_drepl_init(void)
 186 {
 187         return register_server_service("drepl", dreplsrv_init);
 188 }