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/*
Unix SMB/CIFS implementation.
Utility routines
Copyright (C) 2020 Ralph Boehme <slow@samba.org>
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 "lib/tevent/tevent.h"
#include "lib/util/unix_privs.h"
#include "server_util.h"
struct samba_tevent_trace_state {
size_t events;
time_t last_logsize_check;
};
struct samba_tevent_trace_state *create_samba_tevent_trace_state(
TALLOC_CTX *mem_ctx)
{
return talloc_zero(mem_ctx, struct samba_tevent_trace_state);
}
void samba_tevent_trace_callback(enum tevent_trace_point point,
void *private_data)
{
struct samba_tevent_trace_state *state =
talloc_get_type_abort(private_data,
struct samba_tevent_trace_state);
time_t now = time(NULL);
bool do_check_logs = false;
void *priv = NULL;
switch (point) {
case TEVENT_TRACE_BEFORE_WAIT:
break;
default:
return;
}
state->events++;
/*
* Throttling by some random numbers. smbd uses a similar logic
* checking every 50 SMB requests. Assuming 4 events per request
* we get to the number of 200.
*/
if ((state->events % 200) == 0) {
do_check_logs = true;
}
/*
* Throttling by some delay, choosing 29 to avoid lockstep with
* the default tevent tickle timer.
*/
if ((state->last_logsize_check + 29) < now) {
do_check_logs = true;
}
if (!do_check_logs) {
return;
}
/*
* need_to_check_log_size() checks both the number of messages
* that have been logged and if the logging backend is actually
* going to file. We want to bypass the "number of messages"
* check, so we have to call force_check_log_size() before.
*/
force_check_log_size();
if (!need_to_check_log_size()) {
return;
}
priv = root_privileges();
check_log_size();
TALLOC_FREE(priv);
state->last_logsize_check = now;
return;
}
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