mirror of
https://github.com/ntop/ntopng.git
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93 lines
2.9 KiB
C++
93 lines
2.9 KiB
C++
/*
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*
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* (C) 2013-21 - 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 _BEHAVIOURAL_COUNTER_H_
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#define _BEHAVIOURAL_COUNTER_H_
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#include "ntop_includes.h"
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class BehaviouralCounter {
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private:
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public:
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/* Number of points to be used by the algorithm in the learning phase */
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BehaviouralCounter(u_int16_t num_learning_values) { ; }
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virtual ~BehaviouralCounter();
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/*
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Return:
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true An anomaly has been detected
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false The value is within the expected range
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*/
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virtual bool addObservation(u_int32_t value);
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};
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/* ******************************** */
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/* Counter based on Relative Strenght Indicator algorithm */
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class RSICounter : 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_values = 10, u_int8_t lower_percentage = 25, u_int8_t upper_percentage = 75) : BehaviouralCounter(num_learning_values) {
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if(ndpi_alloc_rsi(&rsi, num_learning_values) != 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_int32_t value) {
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float res = ndpi_rsi_add_value(&rsi, value);
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if(res == -1)
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return(false); /* Too early */
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else
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return(((res < lower_pctg) || (res > upper_pctg)) ? true : false);
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}
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};
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/* ******************************** */
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/* Counter based on Holt-Winters algorithm */
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class HWCounter : BehaviouralCounter {
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private:
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struct ndpi_hw_struct hw;
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public:
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HWCounter(u_int16_t num_learning_values = 10, double alpha = 0.5, double beta = 0.5, double gamma = 0.1 ) : BehaviouralCounter(num_learning_values) {
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if(ndpi_hw_init(&hw, num_learning_values, 1 /* additive */, alpha, beta, gamma, 0.05 /* 95% */) != 0)
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throw "Error while creating HW";
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}
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~HWCounter() { ndpi_hw_free(&hw); }
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bool addObservation(u_int32_t value) {
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double forecast, confidence_band;
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return(ndpi_hw_add_value(&hw, value, &forecast, &confidence_band) == 1 ? true : false);
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}
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};
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#endif /* _BEHAVIOURAL_COUNTER_H_ */
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