source4/wrepl_server/wrepl_out_push.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3
   4    WINS Replication server
   5
   6    Copyright (C) Stefan Metzmacher      2005
   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 2 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, write to the Free Software
  20    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  21 */
  22
  23 #include "includes.h"
  24 #include "dlinklist.h"
  25 #include "lib/events/events.h"
  26 #include "lib/socket/socket.h"
  27 #include "smbd/service_task.h"
  28 #include "smbd/service_stream.h"
  29 #include "lib/messaging/irpc.h"
  30 #include "librpc/gen_ndr/ndr_winsrepl.h"
  31 #include "wrepl_server/wrepl_server.h"
  32 #include "nbt_server/wins/winsdb.h"
  33 #include "ldb/include/ldb.h"
  34 #include "libcli/composite/composite.h"
  35 #include "libcli/wrepl/winsrepl.h"
  36 #include "wrepl_server/wrepl_out_helpers.h"
  37
  38 static void wreplsrv_out_partner_push(struct wreplsrv_partner *partner, BOOL propagate);
  39
  40 static void wreplsrv_push_handler_creq(struct composite_context *creq)
  41 {
  42         struct wreplsrv_partner *partner = talloc_get_type(creq->async.private_data, struct wreplsrv_partner);
  43         struct wreplsrv_push_notify_io *old_notify_io;
  44
  45         partner->push.last_status = wreplsrv_push_notify_recv(partner->push.creq);
  46         partner->push.creq = NULL;
  47         partner->push.last_run = timeval_current();
  48
  49         old_notify_io = partner->push.notify_io;
  50         partner->push.notify_io = NULL;
  51
  52         if (NT_STATUS_IS_OK(partner->push.last_status)) {
  53                 partner->push.error_count = 0;
  54                 DEBUG(2,("wreplsrv_push_notify(%s): %s\n",
  55                          partner->address, nt_errstr(partner->push.last_status)));
  56                 goto done;
  57         }
  58
  59         partner->push.error_count++;
  60
  61         if (partner->push.error_count > 1) {
  62                 DEBUG(1,("wreplsrv_push_notify(%s): %s: error_count: %u: giving up\n",
  63                          partner->address, nt_errstr(partner->push.last_status),
  64                          partner->push.error_count));
  65                 goto done;
  66         }
  67
  68         DEBUG(1,("wreplsrv_push_notify(%s): %s: error_count: %u: retry\n",
  69                  partner->address, nt_errstr(partner->push.last_status),
  70                  partner->push.error_count));
  71         wreplsrv_out_partner_push(partner, old_notify_io->in.propagate);
  72 done:
  73         talloc_free(old_notify_io);
  74 }
  75
  76 static void wreplsrv_out_partner_push(struct wreplsrv_partner *partner, BOOL propagate)
  77 {
  78         /* a push for this partner is currently in progress, so we're done */
  79         if (partner->push.creq) return;
  80
  81         /* now prepare the push notify */
  82         partner->push.notify_io = talloc(partner, struct wreplsrv_push_notify_io);
  83         if (!partner->push.notify_io) {
  84                 goto nomem;
  85         }
  86
  87         partner->push.notify_io->in.partner     = partner;
  88         partner->push.notify_io->in.inform      = partner->push.use_inform;
  89         partner->push.notify_io->in.propagate   = propagate;
  90         partner->push.creq = wreplsrv_push_notify_send(partner->push.notify_io, partner->push.notify_io);
  91         if (!partner->push.creq) {
  92                 DEBUG(1,("wreplsrv_push_notify_send(%s) failed\n",
  93                          partner->address));
  94                 goto nomem;
  95         }
  96
  97         partner->push.creq->async.fn            = wreplsrv_push_handler_creq;
  98         partner->push.creq->async.private_data  = partner;
  99
 100         return;
 101 nomem:
 102         talloc_free(partner->push.notify_io);
 103         partner->push.notify_io = NULL;
 104         DEBUG(1,("wreplsrv_push_notify_send(%s) failed nomem? (ignoring)\n",
 105                  partner->address));
 106         return;
 107 }
 108
 109 static uint32_t wreplsrv_calc_change_count(struct wreplsrv_partner *partner)
 110 {
 111         /* TODO: add a real implementation here */
 112         return (uint32_t)-1;
 113 }
 114
 115 uint32_t wreplsrv_out_push_run(struct wreplsrv_service *service, uint32_t next_interval)
 116 {
 117         struct wreplsrv_partner *partner;
 118         uint32_t change_count;
 119
 120         for (partner = service->partners; partner; partner = partner->next) {
 121                 /* if it's not a push partner, go to the next partner */
 122                 if (!(partner->type & WINSREPL_PARTNER_PUSH)) continue;
 123
 124                 /* if push notifies are disabled for this partner, go to the next partner */
 125                 if (partner->push.change_count == 0) continue;
 126
 127                 /* get the actual change count for the partner */
 128                 change_count = wreplsrv_calc_change_count(partner);
 129
 130                 /* if the configured change count isn't reached, go to the next partner */
 131                 if (change_count < partner->push.change_count) continue;
 132
 133                 wreplsrv_out_partner_push(partner, False);
 134         }
 135
 136         return next_interval;
 137 }