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63 lines
2 KiB
C++
63 lines
2 KiB
C++
/*
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*
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* (C) 2013-25 - 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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#ifndef _RSI_COUNTER_H_
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#define _RSI_COUNTER_H_
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#include "ntop_includes.h"
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/* ******************************** */
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/* Counter based on Relative Strenght Indicator algorithm */
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class RSICounter : public BehaviouralCounter {
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private:
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struct ndpi_rsi_struct rsi;
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u_int8_t lower_pctg, upper_pctg;
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public:
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RSICounter(u_int16_t num_learning_observations = 10,
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u_int8_t lower_percentage = 25, u_int8_t upper_percentage = 75)
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: BehaviouralCounter() {
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if (ndpi_alloc_rsi(&rsi, num_learning_observations) != 0)
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throw "Error while creating RSI";
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if ((lower_percentage > upper_percentage) || (upper_percentage > 100))
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lower_percentage = 25, upper_percentage = 75; /* Using defaults */
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lower_pctg = lower_percentage, upper_pctg = upper_percentage;
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}
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~RSICounter() { ndpi_free_rsi(&rsi); }
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bool addObservation(u_int64_t value) {
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float res = ndpi_rsi_add_value(&rsi, last_value = value);
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if (res == -1)
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last_lower = last_upper = 0, is_anomaly = false; /* Too early */
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else {
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is_anomaly = ((res < lower_pctg) || (res > upper_pctg)) ? true : false;
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last_lower = (u_int64_t)lower_pctg, last_upper = (u_int64_t)upper_pctg;
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if (is_anomaly) tot_num_anomalies++;
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}
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return (is_anomaly);
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}
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};
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#endif /* _RSI_COUNTER_H_ */
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