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/*
* metric_anomaly.c
*
* Copyright (C) 2011-22 - ntop.org
*
* nDPI is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* nDPI 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with nDPI. If not, see <http://www.gnu.org/licenses/>.
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <getopt.h>
#include "ndpi_api.h"
#define DEFAULT_ALPHA 0.5
#define DEFAULT_RO 0.05
/* *************************************************** */
static void help() {
printf("Usage: metric_anomaly [-Q][-v][-z][-a <alpha>][-q] -d <database> -q <query>\n"
"-a | Set alpha. Valid range >0 .. <1. Default %.2f\n"
"-Q | Quick output (only anomalies are reported)\n"
"-d <database> | InfluxDB database name\n"
"-q <query> | InfluxQL query\n"
"-v | Verbose\n"
"-z | Bottom metric value set to zero\n"
,
DEFAULT_ALPHA);
printf("\n\nExample: metric_anomaly -d ntopng -q \"%s\"\n",
"SELECT mean(\"cpu0\") FROM \"cpu_load\" WHERE time > 1648634807000000000 GROUP BY time(60s) fill(previous)");
exit(0);
}
/* *************************************************** */
int main(int argc, char *argv[]) {
char *database = NULL, *query = NULL, cmd[512], buf[256];
u_int i, j, first = 1, quick_mode = 0, verbose = 0;
struct ndpi_ses_struct ses;
float alpha, ro;
char c;
FILE *fd;
bool go_below_zero = true;
/* Defaults */
alpha = DEFAULT_ALPHA;
ro = DEFAULT_RO;
while((c = getopt(argc, argv, "a:Qd:q:vz")) != '?') {
if(c == -1) break;
switch(c) {
case 'a':
{
float f = atof(optarg);
if((f > 0) && (f < 1))
alpha = f;
else
printf("Discarding -a: valid range is >0 .. <1\n");
}
break;
case 'Q':
quick_mode = 1;
break;
case 'd':
database = optarg;
break;
case 'q':
query = optarg;
break;
case 'v':
verbose = 1;
break;
case 'z':
go_below_zero = false;
break;
default:
help();
break;
}
}
if((database == NULL) || (query == NULL))
help();
snprintf(cmd, sizeof(cmd), "influx -database '%s' -precision s -execute '%s'", database, query);
if(verbose) printf("%s\n", cmd);
if ((fd = popen(cmd, "r")) == NULL) {
printf("Unable to execute '%s'\n", cmd);
return(-1);
}
ndpi_ses_init(&ses, alpha, ro);
while(fgets(buf, sizeof(buf), fd) != NULL) {
u_int32_t epoch;
float value;
double prediction, confidence_band;
double lower, upper;
int rc;
bool is_anomaly;
if(sscanf(buf, "%u %f", &epoch, &value) != 2)
continue;
// printf("->>> '%s'", buf);
value *= 100; /* trick to avoid dealing with floats */
rc = ndpi_ses_add_value(&ses, value, &prediction, &confidence_band);
lower = prediction - confidence_band, upper = prediction + confidence_band;
if(!go_below_zero) lower = ndpi_max(lower, 0), upper = ndpi_max(upper, 0);
is_anomaly = ((rc == 0) || (confidence_band == 0) || ((value >= lower) && (value <= upper))) ? false : true;
if(verbose || is_anomaly) {
const time_t _t = epoch;
struct tm *t_info = localtime((const time_t*)&_t);
strftime(buf, sizeof(buf), "%d/%b/%Y %H:%M:%S", t_info);
if(quick_mode) {
if(is_anomaly) {
printf("%u [%s]\n", epoch, buf);
}
} else {
if(first) {
first = 0;
printf("%s %s\t%s %s %s\t %s [%s]\n",
"When", "Value", "Prediction", "Lower", "Upper", "Out", "Band");
}
printf("%s %12.3f\t%.3f\t%12.3f\t%12.3f\t %s [%.3f][rc: %d]\n",
buf, value/100., prediction/100., lower/100., upper/100., is_anomaly? "ANOMALY" : "OK",
confidence_band/100., rc);
}
}
}
(void)pclose(fd);
return(0);
}
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