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/*
Unix SMB/CIFS implementation.
WINS Replication server
Copyright (C) Stefan Metzmacher 2005
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "librpc/gen_ndr/winsrepl.h"
#include "wrepl_server/wrepl_server.h"
#include "libcli/composite/composite.h"
#include "nbt_server/wins/winsdb.h"
static void wreplsrv_out_partner_push(struct wreplsrv_partner *partner, bool propagate);
static void wreplsrv_push_handler_creq(struct composite_context *creq)
{
struct wreplsrv_partner *partner = talloc_get_type(creq->async.private_data, struct wreplsrv_partner);
struct wreplsrv_push_notify_io *old_notify_io;
partner->push.last_status = wreplsrv_push_notify_recv(partner->push.creq);
partner->push.creq = NULL;
old_notify_io = partner->push.notify_io;
partner->push.notify_io = NULL;
if (NT_STATUS_IS_OK(partner->push.last_status)) {
partner->push.error_count = 0;
DEBUG(2,("wreplsrv_push_notify(%s): %s\n",
partner->address, nt_errstr(partner->push.last_status)));
goto done;
}
partner->push.error_count++;
if (partner->push.error_count > 1) {
DEBUG(1,("wreplsrv_push_notify(%s): %s: error_count: %u: giving up\n",
partner->address, nt_errstr(partner->push.last_status),
partner->push.error_count));
goto done;
}
DEBUG(1,("wreplsrv_push_notify(%s): %s: error_count: %u: retry\n",
partner->address, nt_errstr(partner->push.last_status),
partner->push.error_count));
wreplsrv_out_partner_push(partner, old_notify_io->in.propagate);
done:
talloc_free(old_notify_io);
}
static void wreplsrv_out_partner_push(struct wreplsrv_partner *partner, bool propagate)
{
/* a push for this partner is currently in progress, so we're done */
if (partner->push.creq) return;
/* now prepare the push notify */
partner->push.notify_io = talloc(partner, struct wreplsrv_push_notify_io);
if (!partner->push.notify_io) {
goto nomem;
}
partner->push.notify_io->in.partner = partner;
partner->push.notify_io->in.inform = partner->push.use_inform;
partner->push.notify_io->in.propagate = propagate;
partner->push.creq = wreplsrv_push_notify_send(partner->push.notify_io, partner->push.notify_io);
if (!partner->push.creq) {
DEBUG(1,("wreplsrv_push_notify_send(%s) failed nomem?\n",
partner->address));
goto nomem;
}
partner->push.creq->async.fn = wreplsrv_push_handler_creq;
partner->push.creq->async.private_data = partner;
return;
nomem:
talloc_free(partner->push.notify_io);
partner->push.notify_io = NULL;
DEBUG(1,("wreplsrv_out_partner_push(%s,%u) failed nomem? (ignoring)\n",
partner->address, propagate));
return;
}
static uint32_t wreplsrv_calc_change_count(struct wreplsrv_partner *partner, uint64_t maxVersionID)
{
uint64_t tmp_diff = UINT32_MAX;
/* catch an overflow */
if (partner->push.maxVersionID > maxVersionID) {
goto done;
}
tmp_diff = maxVersionID - partner->push.maxVersionID;
if (tmp_diff > UINT32_MAX) {
tmp_diff = UINT32_MAX;
goto done;
}
done:
partner->push.maxVersionID = maxVersionID;
return (uint32_t)(tmp_diff & UINT32_MAX);
}
NTSTATUS wreplsrv_out_push_run(struct wreplsrv_service *service)
{
struct wreplsrv_partner *partner;
uint64_t seqnumber;
uint32_t change_count;
seqnumber = winsdb_get_maxVersion(service->wins_db);
for (partner = service->partners; partner; partner = partner->next) {
/* if it's not a push partner, go to the next partner */
if (!(partner->type & WINSREPL_PARTNER_PUSH)) continue;
/* if push notifies are disabled for this partner, go to the next partner */
if (partner->push.change_count == 0) continue;
/* get the actual change count for the partner */
change_count = wreplsrv_calc_change_count(partner, seqnumber);
/* if the configured change count isn't reached, go to the next partner */
if (change_count < partner->push.change_count) continue;
wreplsrv_out_partner_push(partner, false);
}
return NT_STATUS_OK;
}
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