source4/wrepl_server/wrepl_out_pull.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 "librpc/gen_ndr/ndr_winsrepl.h"
  25 #include "wrepl_server/wrepl_server.h"
  26 #include "libcli/composite/composite.h"
  27
  28 static void wreplsrv_out_pull_reschedule(struct wreplsrv_partner *partner, uint32_t interval)
  29 {
  30         NTSTATUS status;
  31
  32         partner->pull.next_run = timeval_current_ofs(interval, 0);
  33         status = wreplsrv_periodic_schedule(partner->service, interval);
  34         if (!NT_STATUS_IS_OK(status)) {
  35                 DEBUG(0,("wreplsrv_periodic_schedule() failed\n"));
  36         }
  37 }
  38
  39 static void wreplsrv_pull_handler_creq(struct composite_context *creq)
  40 {
  41         struct wreplsrv_partner *partner = talloc_get_type(creq->async.private_data, struct wreplsrv_partner);
  42         struct wreplsrv_pull_cycle_io *old_cycle_io;
  43         struct wrepl_table inform_in;
  44
  45         partner->pull.last_status = wreplsrv_pull_cycle_recv(partner->pull.creq);
  46         partner->pull.creq = NULL;
  47
  48         old_cycle_io = partner->pull.cycle_io;
  49         partner->pull.cycle_io = NULL;
  50
  51         if (NT_STATUS_IS_OK(partner->pull.last_status)) {
  52                 partner->pull.error_count = 0;
  53                 DEBUG(2,("wreplsrv_pull_cycle(%s): %s\n",
  54                          partner->address, nt_errstr(partner->pull.last_status)));
  55                 goto done;
  56         }
  57
  58         partner->pull.error_count++;
  59
  60         if (partner->pull.error_count > 1) {
  61                 uint32_t retry_interval;
  62
  63                 retry_interval = partner->pull.error_count * partner->pull.retry_interval;
  64                 retry_interval = MIN(retry_interval, partner->pull.interval);
  65
  66                 DEBUG(1,("wreplsrv_pull_cycle(%s): %s: error_count: %u: reschedule(%u)\n",
  67                          partner->address, nt_errstr(partner->pull.last_status),
  68                          partner->pull.error_count, retry_interval));
  69
  70                 wreplsrv_out_pull_reschedule(partner, retry_interval);
  71                 goto done;
  72         }
  73
  74         DEBUG(1,("wreplsrv_pull_cycle(%s): %s: error_count:%u retry\n",
  75                  partner->address, nt_errstr(partner->pull.last_status),
  76                  partner->pull.error_count));
  77         inform_in.partner_count = old_cycle_io->in.num_owners;
  78         inform_in.partners      = old_cycle_io->in.owners;
  79         wreplsrv_out_partner_pull(partner, &inform_in);
  80 done:
  81         talloc_free(old_cycle_io);
  82 }
  83
  84 void wreplsrv_out_partner_pull(struct wreplsrv_partner *partner, struct wrepl_table *inform_in)
  85 {
  86         /* there's already a pull in progress, so we're done */
  87         if (partner->pull.creq) return;
  88
  89         partner->pull.cycle_io = talloc(partner, struct wreplsrv_pull_cycle_io);
  90         if (!partner->pull.cycle_io) {
  91                 goto nomem;
  92         }
  93
  94         partner->pull.cycle_io->in.partner      = partner;
  95         partner->pull.cycle_io->in.wreplconn    = NULL;
  96         if (inform_in) {
  97                 partner->pull.cycle_io->in.num_owners   = inform_in->partner_count;
  98                 partner->pull.cycle_io->in.owners       = inform_in->partners;
  99                 talloc_steal(partner->pull.cycle_io, inform_in->partners);
 100         } else {
 101                 partner->pull.cycle_io->in.num_owners   = 0;
 102                 partner->pull.cycle_io->in.owners       = NULL;
 103         }
 104         partner->pull.creq = wreplsrv_pull_cycle_send(partner->pull.cycle_io, partner->pull.cycle_io);
 105         if (!partner->pull.creq) {
 106                 DEBUG(1,("wreplsrv_pull_cycle_send(%s) failed\n",
 107                          partner->address));
 108                 goto nomem;
 109         }
 110
 111         partner->pull.creq->async.fn            = wreplsrv_pull_handler_creq;
 112         partner->pull.creq->async.private_data  = partner;
 113
 114         return;
 115 nomem:
 116         talloc_free(partner->pull.cycle_io);
 117         partner->pull.cycle_io = NULL;
 118         DEBUG(0,("wreplsrv_out_partner_pull(%s): no memory? (ignoring)\n",
 119                 partner->address));
 120         return;
 121 }
 122
 123 NTSTATUS wreplsrv_out_pull_run(struct wreplsrv_service *service)
 124 {
 125         struct wreplsrv_partner *partner;
 126
 127         for (partner = service->partners; partner; partner = partner->next) {
 128                 /* if it's not a pull partner, go to the next partner */
 129                 if (!(partner->type & WINSREPL_PARTNER_PULL)) continue;
 130
 131                 /* if pulling is disabled for the partner, go to the next one */
 132                 if (partner->pull.interval == 0) continue;
 133
 134                 /* if the next timer isn't reached, go to the next partner */
 135                 if (!timeval_expired(&partner->pull.next_run)) continue;
 136
 137                 wreplsrv_out_pull_reschedule(partner, partner->pull.interval);
 138
 139                 wreplsrv_out_partner_pull(partner, NULL);
 140         }
 141
 142         return NT_STATUS_OK;
 143 }