mirror of
https://github.com/ntop/ntopng.git
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127 lines
4.5 KiB
C++
127 lines
4.5 KiB
C++
/*
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*
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* (C) 2013-17 - 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(u_int32_t _max_num_hits_sec,
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u_int8_t _over_threshold_duration_sec) {
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resetThresholds(_max_num_hits_sec, _over_threshold_duration_sec);
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}
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/* *************************************** */
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void AlertCounter::resetThresholds(u_int32_t _max_num_hits_sec, u_int8_t _over_threshold_duration_sec) {
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max_num_hits_sec = _max_num_hits_sec;
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over_threshold_duration_sec = _over_threshold_duration_sec;
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if(over_threshold_duration_sec < 1) over_threshold_duration_sec = 1;
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init();
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}
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/* *************************************** */
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void AlertCounter::init() {
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time_last_hit = time_last_alert_reported = 0;
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num_hits_rcvd_last_second = 0;
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last_trespassed_threshold = 0, num_trespassed_threshold = 0;
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num_hits_since_first_alert = 0;
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last_trespassed_hits = 0;
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thresholdTrepassed = false;
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}
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/* *************************************** */
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bool AlertCounter::incHits(time_t when) {
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if(time_last_hit < (when-1))
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init(); /* Only consecutive alerts matter */
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else if(time_last_hit == (when-1))
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num_hits_rcvd_last_second = 0;
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num_hits_rcvd_last_second++, num_hits_since_first_alert++, time_last_hit = when;
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if((num_hits_rcvd_last_second > max_num_hits_sec)
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&& (last_trespassed_threshold != when)) {
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num_trespassed_threshold++, last_trespassed_threshold = when;
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#ifdef ALERT_DEBUG
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ntop->getTrace()->traceEvent(TRACE_NORMAL,
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"Trepass [num: %u][last: %u][now: %u][duration: %u]",
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num_trespassed_threshold, last_trespassed_threshold, when,
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over_threshold_duration_sec);
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#endif
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if(num_trespassed_threshold > over_threshold_duration_sec) {
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#ifdef ALERT_DEBUG
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ntop->getTrace()->traceEvent(TRACE_NORMAL,
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"Alarm triggered [num: %u][last: %u][now: %u][duration: %u]",
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num_trespassed_threshold, last_trespassed_threshold, when,
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over_threshold_duration_sec);
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#endif
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if(when > (time_last_alert_reported+CONST_ALERT_GRACE_PERIOD)) {
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#ifdef ALERT_DEBUG
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ntop->getTrace()->traceEvent(TRACE_NORMAL,
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"Alert emitted [num: %u][now: %u][duration: %u][tot_hits: %u][hits: %u/%u]",
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num_trespassed_threshold, when,
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over_threshold_duration_sec, num_hits_since_first_alert,
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num_hits_rcvd_last_second, max_num_hits_sec);
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#endif
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time_last_alert_reported = when;
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last_trespassed_hits = num_hits_rcvd_last_second;
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thresholdTrepassed = true;
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return(thresholdTrepassed);
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}
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}
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}
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/* Do not reset the flag immediately, we need time to process it from LUA */
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if(when > (time_last_alert_reported+CONST_ALERT_GRACE_PERIOD))
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thresholdTrepassed = false;
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return(thresholdTrepassed);
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}
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/* *************************************** */
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void AlertCounter::lua(lua_State* vm, const char *table_key) {
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if(vm) {
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lua_newtable(vm);
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lua_push_int_table_entry(vm, "max_num_hits_sec", max_num_hits_sec);
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lua_push_int_table_entry(vm, "num_hits_since_first_alert", num_hits_since_first_alert);
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lua_push_int_table_entry(vm, "over_threshold_duration_sec", over_threshold_duration_sec);
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lua_push_int_table_entry(vm, "time_last_hit", time_last_hit);
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lua_push_int_table_entry(vm, "time_last_alert_reported", time_last_alert_reported);
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lua_push_int_table_entry(vm, "last_trespassed_threshold", last_trespassed_threshold);
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lua_push_int_table_entry(vm, "num_trespassed_threshold", num_trespassed_threshold);
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lua_push_int_table_entry(vm, "num_hits_rcvd_last_second", num_hits_rcvd_last_second);
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lua_push_int_table_entry(vm, "last_trespassed_hits", last_trespassed_hits);
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lua_push_bool_table_entry(vm, "threshold_trepassed", thresholdTrepassed);
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lua_pushstring(vm, table_key ? table_key : (char*)"alert_counter");
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lua_insert(vm, -2);
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lua_settable(vm, -3);
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}
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}
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