mirror of
https://github.com/ntop/ntopng.git
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110 lines
3.6 KiB
C++
110 lines
3.6 KiB
C++
/*
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*
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* (C) 2013-19 - ntop.org
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*
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include "ntop_includes.h"
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// #define ALERT_DEBUG 1
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/* *************************************** */
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AlertCounter::AlertCounter() {
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trailing_window_max_since_hits_reset = 0;
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hits_reset_req = false;
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reset_window();
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}
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/* *************************************** */
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void AlertCounter::reset_window(time_t when) {
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memset(&trailing_window, 0, sizeof(trailing_window));
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trailing_window_min = 0;
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trailing_index = 0;
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time_last_hit = when;
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}
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/* *************************************** */
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void AlertCounter::inc(time_t when, AlertableEntity *alertable) {
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if(hits_reset_req) { /* Reset the maximum as requested and start over */
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trailing_window_max_since_hits_reset = 0;
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hits_reset_req = false;
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reset_window(when);
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}
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if(when - time_last_hit > 1) /* Only consecutive hits matter */
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reset_window(when);
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if(when - time_last_hit) { /* If true, difference must be 1 as reset_window(when) is called if > 1 */
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u_int16_t tmp_min = trailing_window[0]; /* Update the minimum value to make sure all the elements in the window are >= */
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for(u_int8_t i = 1; i < ALERT_COUNTER_WINDOW_SECS; i++) {
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if(trailing_window[i] < tmp_min /* New minimum detected */)
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tmp_min = trailing_window[i];
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}
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trailing_window_min = tmp_min;
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/* Update the overall maximum of minima since reset */
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if(trailing_window_min > trailing_window_max_since_hits_reset)
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trailing_window_max_since_hits_reset = trailing_window_min;
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trailing_index = (trailing_index + 1) % ALERT_COUNTER_WINDOW_SECS; /* Move to the next element in the array */
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trailing_window[trailing_index] = 0; /* Reset as it could contain old values */
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time_last_hit = when; /* Update the last hit */
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}
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if(trailing_window[trailing_index] < (u_int16_t)-1) /* Protect against wraps */
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trailing_window[trailing_index]++;
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#if 0
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char buf[256];
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ntop->getTrace()->traceEvent(TRACE_NORMAL,
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"stats [host: %s][when: %u][time_last_hit: %u][trailing_window_max_since_hits_reset: %u][trailing_window_min: %u]"
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"[trailing_window[cur]: %u][trailing_window[cur-1]: %u][trailing_window[cur-2]: %u]",
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h->get_ip()->print(buf, sizeof(buf)),
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alertable->getEntityValue()->c_str(),
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when,
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time_last_hit,
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trailing_window_max_since_hits_reset,
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trailing_window_min,
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trailing_window[trailing_index],
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trailing_window[(trailing_index + 2) % ALERT_COUNTER_WINDOW_SECS],
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trailing_window[(trailing_index + 1) % ALERT_COUNTER_WINDOW_SECS]
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);
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#endif
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}
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/* *************************************** */
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u_int16_t AlertCounter::hits() const {
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if(hits_reset_req) /* Requested, but not yet reset */
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return 0;
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return trailing_window_max_since_hits_reset;
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}
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/* *************************************** */
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void AlertCounter::reset_hits() {
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hits_reset_req = true;
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}
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