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/*
* rrd_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 <rrd.h>
#include "ndpi_api.h"
#define DEFAULT_ALPHA 0.5
#define DEFAULT_RO 0.05
#define DEFAULT_START "now-1d"
#define DEFAULT_END "now"
/* *************************************************** */
static void help() {
printf("Usage: rrd_anomaly [-v][-a <alpha>][-e <end>][-q][-s <start>] -f <filename>\n"
"-a | Set alpha. Valid range >0 .. <1. Default %.2f\n"
"-e <end> | RRD end time. Default %s\n"
"-q | Quick output (only anomalies are reported)\n"
"-s <start> | RRD start time. Default %s\n"
"-f <rrd path> | Path of the RRD filename to analyze\n"
"-v | Verbose\n"
,
DEFAULT_ALPHA, DEFAULT_END, DEFAULT_START);
printf("\n\nExample: rrd_anomaly -q -f hum.rrd\n");
exit(0);
}
/* *************************************************** */
int main(int argc, char *argv[]) {
rrd_time_value_t start_tv, end_tv;
unsigned long step = 0, ds_cnt = 0;
rrd_value_t *data, *p;
char **names, *filename = NULL, *start_s, *end_s, *cf;
u_int i, first = 1, quick_mode = 0, verbose = 0;
time_t t, start, end;
struct ndpi_ses_struct ses;
float alpha, ro;
int c;
/* Defaults */
alpha = DEFAULT_ALPHA;
start_s = DEFAULT_START;
end_s = DEFAULT_END;
cf = "AVERAGE";
ro = DEFAULT_RO;
while((c = getopt(argc, argv, "s:e:a:qf:r:v")) != '?') {
if(c == -1) break;
switch(c) {
case 's':
start_s = optarg;
break;
case 'e':
end_s = optarg;
break;
case 'q':
quick_mode = 1;
break;
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 'f':
filename = optarg;
break;
case 'r':
ro = atof(optarg);
if((ro <= 0) || (ro >= 1))
ro = DEFAULT_RO;
break;
case 'v':
verbose = 1;
break;
default:
help();
break;
}
}
if(filename == NULL)
help();
ndpi_ses_init(&ses, alpha, ro);
if((rrd_parsetime(start_s, &start_tv) != NULL)) {
printf("Unable to parse start time %s\n", start_s);
return(-1);
}
if((rrd_parsetime(end_s, &end_tv) != NULL)) {
printf("Unable to parse end time %s\n", end_s);
return(-1);
}
rrd_proc_start_end(&start_tv, &end_tv, &start, &end);
if(rrd_fetch_r(filename, cf, &start, &end, &step, &ds_cnt, &names, &data) != 0) {
printf("Unable to extract data from rrd %s\n", filename);
return(-2);
}
p = data;
for(t=start+1, i=0; t<end; t+=step, i++) {
rrd_value_t value = *p++;
if(!isnan(value)) {
double prediction, confidence_band;
double lower, upper;
char buf[32];
int rc;
u_int is_anomaly;
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;
is_anomaly = ((rc == 0) || (confidence_band == 0) || ((value >= lower) && (value <= upper))) ? 0 : 1;
if(verbose || is_anomaly) {
if(quick_mode) {
printf("%ld\n", t);
} else {
const time_t _t = t;
struct tm *t_info = localtime((const time_t*)&_t);
strftime(buf, sizeof(buf), "%d/%b/%Y %H:%M:%S", t_info);
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]\n",
buf, value/100., prediction/100., lower/100., upper/100., is_anomaly? "ANOMALY" : "OK",
confidence_band/100.);
}
}
}
}
rrd_freemem(data);
return(0);
}
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