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chrony/cmdparse.c
Miroslav Lichvar 189aafde9d ntp: add filter option 
Add an option to use the median filter to reduce noise in measurements
before they are accumulated to sourcestats, similarly to reference
clocks. The option specifies how many samples are reduced to a single
sample.

The filter is intended to be used with very short polling intervals in
local networks where it is acceptable to generate a lot of NTP traffic.
2018-08-09 14:33:47 +02:00

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/*
chronyd/chronyc - Programs for keeping computer clocks accurate.
**********************************************************************
* Copyright (C) Richard P. Curnow 1997-2003
* Copyright (C) Miroslav Lichvar 2013-2014, 2016
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of version 2 of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
**********************************************************************
=======================================================================
Module for parsing various forms of directive and command lines that
are common to the configuration file and to the command client.
*/
#include "config.h"
#include "sysincl.h"
#include "cmdparse.h"
#include "memory.h"
#include "nameserv.h"
#include "ntp.h"
#include "util.h"
/* ================================================== */
int
CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
{
char *hostname, *cmd;
int n;
src->port = SRC_DEFAULT_PORT;
src->params.minpoll = SRC_DEFAULT_MINPOLL;
src->params.maxpoll = SRC_DEFAULT_MAXPOLL;
src->params.connectivity = SRC_ONLINE;
src->params.auto_offline = 0;
src->params.presend_minpoll = SRC_DEFAULT_PRESEND_MINPOLL;
src->params.burst = 0;
src->params.iburst = 0;
src->params.min_stratum = SRC_DEFAULT_MINSTRATUM;
src->params.poll_target = SRC_DEFAULT_POLLTARGET;
src->params.version = 0;
src->params.max_sources = SRC_DEFAULT_MAXSOURCES;
src->params.min_samples = SRC_DEFAULT_MINSAMPLES;
src->params.max_samples = SRC_DEFAULT_MAXSAMPLES;
src->params.filter_length = 0;
src->params.interleaved = 0;
src->params.sel_options = 0;
src->params.authkey = INACTIVE_AUTHKEY;
src->params.max_delay = SRC_DEFAULT_MAXDELAY;
src->params.max_delay_ratio = SRC_DEFAULT_MAXDELAYRATIO;
src->params.max_delay_dev_ratio = SRC_DEFAULT_MAXDELAYDEVRATIO;
src->params.min_delay = 0.0;
src->params.asymmetry = SRC_DEFAULT_ASYMMETRY;
src->params.offset = 0.0;
hostname = line;
line = CPS_SplitWord(line);
if (!*hostname)
return 0;
src->name = hostname;
/* Parse options */
for (; *line; line += n) {
cmd = line;
line = CPS_SplitWord(line);
n = 0;
if (!strcasecmp(cmd, "auto_offline")) {
src->params.auto_offline = 1;
} else if (!strcasecmp(cmd, "burst")) {
src->params.burst = 1;
} else if (!strcasecmp(cmd, "iburst")) {
src->params.iburst = 1;
} else if (!strcasecmp(cmd, "offline")) {
src->params.connectivity = SRC_OFFLINE;
} else if (!strcasecmp(cmd, "noselect")) {
src->params.sel_options |= SRC_SELECT_NOSELECT;
} else if (!strcasecmp(cmd, "prefer")) {
src->params.sel_options |= SRC_SELECT_PREFER;
} else if (!strcasecmp(cmd, "require")) {
src->params.sel_options |= SRC_SELECT_REQUIRE;
} else if (!strcasecmp(cmd, "trust")) {
src->params.sel_options |= SRC_SELECT_TRUST;
} else if (!strcasecmp(cmd, "key")) {
if (sscanf(line, "%"SCNu32"%n", &src->params.authkey, &n) != 1 ||
src->params.authkey == INACTIVE_AUTHKEY)
return 0;
} else if (!strcasecmp(cmd, "asymmetry")) {
if (sscanf(line, "%lf%n", &src->params.asymmetry, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "filter")) {
if (sscanf(line, "%d%n", &src->params.filter_length, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "maxdelay")) {
if (sscanf(line, "%lf%n", &src->params.max_delay, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "maxdelayratio")) {
if (sscanf(line, "%lf%n", &src->params.max_delay_ratio, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "maxdelaydevratio")) {
if (sscanf(line, "%lf%n", &src->params.max_delay_dev_ratio, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "maxpoll")) {
if (sscanf(line, "%d%n", &src->params.maxpoll, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "maxsamples")) {
if (sscanf(line, "%d%n", &src->params.max_samples, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "maxsources")) {
if (sscanf(line, "%d%n", &src->params.max_sources, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "mindelay")) {
if (sscanf(line, "%lf%n", &src->params.min_delay, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "minpoll")) {
if (sscanf(line, "%d%n", &src->params.minpoll, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "minsamples")) {
if (sscanf(line, "%d%n", &src->params.min_samples, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "minstratum")) {
if (sscanf(line, "%d%n", &src->params.min_stratum, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "offset")) {
if (sscanf(line, "%lf%n", &src->params.offset, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "port")) {
if (sscanf(line, "%hu%n", &src->port, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "polltarget")) {
if (sscanf(line, "%d%n", &src->params.poll_target, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "presend")) {
if (sscanf(line, "%d%n", &src->params.presend_minpoll, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "version")) {
if (sscanf(line, "%d%n", &src->params.version, &n) != 1)
return 0;
} else if (!strcasecmp(cmd, "xleave")) {
src->params.interleaved = 1;
} else {
return 0;
}
}
return 1;
}
/* ================================================== */
int
CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance)
{
int n;
char *cmd;
*stratum = 10;
*distance = 1.0;
*orphan = 0;
while (*line) {
cmd = line;
line = CPS_SplitWord(line);
if (!strcasecmp(cmd, "stratum")) {
if (sscanf(line, "%d%n", stratum, &n) != 1 ||
*stratum >= NTP_MAX_STRATUM || *stratum <= 0)
return 0;
} else if (!strcasecmp(cmd, "orphan")) {
*orphan = 1;
n = 0;
} else if (!strcasecmp(cmd, "distance")) {
if (sscanf(line, "%lf%n", distance, &n) != 1)
return 0;
} else {
return 0;
}
line += n;
}
return 1;
}
/* ================================================== */
void
CPS_NormalizeLine(char *line)
{
char *p, *q;
int space = 1, first = 1;
/* Remove white-space at beginning and replace white-spaces with space char */
for (p = q = line; *p; p++) {
if (isspace((unsigned char)*p)) {
if (!space)
*q++ = ' ';
space = 1;
continue;
}
/* Discard comment lines */
if (first && strchr("!;#%", *p))
break;
*q++ = *p;
space = first = 0;
}
/* Strip trailing space */
if (q > line && q[-1] == ' ')
q--;
*q = '\0';
}
/* ================================================== */
char *
CPS_SplitWord(char *line)
{
char *p = line, *q = line;
/* Skip white-space before the word */
while (*q && isspace((unsigned char)*q))
q++;
/* Move the word to the beginning */
while (*q && !isspace((unsigned char)*q))
*p++ = *q++;
/* Find the next word */
while (*q && isspace((unsigned char)*q))
q++;
*p = '\0';
/* Return pointer to the next word or NUL */
return q;
}
/* ================================================== */
int
CPS_ParseKey(char *line, uint32_t *id, const char **hash, char **key)
{
char *s1, *s2, *s3, *s4;
s1 = line;
s2 = CPS_SplitWord(s1);
s3 = CPS_SplitWord(s2);
s4 = CPS_SplitWord(s3);
/* Require two or three words */
if (!*s2 || *s4)
return 0;
if (sscanf(s1, "%"SCNu32, id) != 1)
return 0;
if (*s3) {
*hash = s2;
*key = s3;
} else {
*hash = "MD5";
*key = s2;
}
return 1;
}
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