source4/wrepl_server/wrepl_out_connection.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_pull_handler_te(struct event_context *ev, struct timed_event *te,
  39                                      struct timeval t, void *ptr);
  40
  41 static void wreplsrv_pull_handler_creq(struct composite_context *creq)
  42 {
  43         struct wreplsrv_partner *partner = talloc_get_type(creq->async.private_data, struct wreplsrv_partner);
  44         uint32_t interval;
  45
  46         partner->pull.last_status = wreplsrv_pull_cycle_recv(partner->pull.creq);
  47         partner->pull.creq = NULL;
  48         talloc_free(partner->pull.cycle_io);
  49         partner->pull.cycle_io = NULL;
  50
  51         if (!NT_STATUS_IS_OK(partner->pull.last_status)) {
  52                 interval = partner->pull.error_count * partner->pull.retry_interval;
  53                 interval = MIN(interval, partner->pull.interval);
  54                 partner->pull.error_count++;
  55
  56                 DEBUG(1,("wreplsrv_pull_cycle(%s): %s: next: %us\n",
  57                          partner->address, nt_errstr(partner->pull.last_status),
  58                          interval));
  59         } else {
  60                 interval = partner->pull.interval;
  61                 partner->pull.error_count = 0;
  62
  63                 DEBUG(2,("wreplsrv_pull_cycle(%s): %s: next: %us\n",
  64                          partner->address, nt_errstr(partner->pull.last_status),
  65                          interval));
  66         }
  67
  68         partner->pull.te = event_add_timed(partner->service->task->event_ctx, partner,
  69                                            timeval_current_ofs(interval, 0),
  70                                            wreplsrv_pull_handler_te, partner);
  71         if (!partner->pull.te) {
  72                 DEBUG(0,("wreplsrv_pull_handler_creq: event_add_timed() failed! no memory!\n"));
  73         }
  74 }
  75
  76 static void wreplsrv_pull_handler_te(struct event_context *ev, struct timed_event *te,
  77                                      struct timeval t, void *ptr)
  78 {
  79         struct wreplsrv_partner *partner = talloc_get_type(ptr, struct wreplsrv_partner);
  80
  81         partner->pull.te = NULL;
  82
  83         partner->pull.cycle_io = talloc(partner, struct wreplsrv_pull_cycle_io);
  84         if (!partner->pull.cycle_io) {
  85                 goto requeue;
  86         }
  87
  88         partner->pull.cycle_io->in.partner      = partner;
  89         partner->pull.cycle_io->in.num_owners   = 0;
  90         partner->pull.cycle_io->in.owners       = NULL;
  91         partner->pull.cycle_io->in.wreplconn    = NULL;
  92         partner->pull.creq = wreplsrv_pull_cycle_send(partner->pull.cycle_io, partner->pull.cycle_io);
  93         if (!partner->pull.creq) {
  94                 DEBUG(1,("wreplsrv_pull_cycle_send(%s) failed\n",
  95                          partner->address));
  96                 goto requeue;
  97         }
  98
  99         partner->pull.creq->async.fn            = wreplsrv_pull_handler_creq;
 100         partner->pull.creq->async.private_data  = partner;
 101
 102         return;
 103 requeue:
 104         talloc_free(partner->pull.cycle_io);
 105         partner->pull.cycle_io = NULL;
 106         /* retry later */
 107         partner->pull.te = event_add_timed(partner->service->task->event_ctx, partner,
 108                                            timeval_add(&t, partner->pull.retry_interval, 0),
 109                                            wreplsrv_pull_handler_te, partner);
 110         if (!partner->pull.te) {
 111                 DEBUG(0,("wreplsrv_pull_handler_te: event_add_timed() failed! no memory!\n"));
 112         }
 113 }
 114
 115 NTSTATUS wreplsrv_sched_inform_action(struct wreplsrv_partner *partner, struct wrepl_table *inform_in)
 116 {
 117         if (partner->pull.creq) {
 118                 /* there's already a pull in progress, so we're done */
 119                 return NT_STATUS_OK;
 120         }
 121
 122         /* remove the scheduled pull */
 123         talloc_free(partner->pull.te);
 124         partner->pull.te = NULL;
 125
 126         partner->pull.cycle_io = talloc(partner, struct wreplsrv_pull_cycle_io);
 127         if (!partner->pull.cycle_io) {
 128                 goto requeue;
 129         }
 130
 131         partner->pull.cycle_io->in.partner      = partner;
 132         partner->pull.cycle_io->in.num_owners   = inform_in->partner_count;
 133         partner->pull.cycle_io->in.owners       = inform_in->partners;
 134         talloc_steal(partner->pull.cycle_io, inform_in->partners);
 135         partner->pull.cycle_io->in.wreplconn    = NULL;
 136         partner->pull.creq = wreplsrv_pull_cycle_send(partner->pull.cycle_io, partner->pull.cycle_io);
 137         if (!partner->pull.creq) {
 138                 DEBUG(1,("wreplsrv_pull_cycle_send(%s) failed\n",
 139                          partner->address));
 140                 goto requeue;
 141         }
 142
 143         partner->pull.creq->async.fn            = wreplsrv_pull_handler_creq;
 144         partner->pull.creq->async.private_data  = partner;
 145
 146         return NT_STATUS_OK;
 147 requeue:
 148         talloc_free(partner->pull.cycle_io);
 149         partner->pull.cycle_io = NULL;
 150         /* retry later */
 151         partner->pull.te = event_add_timed(partner->service->task->event_ctx, partner,
 152                                            timeval_current_ofs(partner->pull.retry_interval, 0),
 153                                            wreplsrv_pull_handler_te, partner);
 154         if (!partner->pull.te) {
 155                 DEBUG(0,("wreplsrv_pull_handler_te: event_add_timed() failed! no memory!\n"));
 156         }
 157
 158         return NT_STATUS_OK;
 159 }
 160
 161 NTSTATUS wreplsrv_setup_out_connections(struct wreplsrv_service *service)
 162 {
 163         struct wreplsrv_partner *cur;
 164
 165         for (cur = service->partners; cur; cur = cur->next) {
 166                 if ((cur->type & WINSREPL_PARTNER_PULL) && cur->pull.interval) {
 167                         cur->pull.te = event_add_timed(service->task->event_ctx, cur,
 168                                                        timeval_zero(), wreplsrv_pull_handler_te, cur);
 169                         NT_STATUS_HAVE_NO_MEMORY(cur->pull.te);
 170                 }
 171         }
 172
 173         return NT_STATUS_OK;
 174 }