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chrony/cmdparse.c
Miroslav Lichvar 70cdd8b1ef ntp: add client support for network correction 
If the network correction is known for both the request and response,
and their sum is not larger that the measured peer delay, allowing the
transparent clocks to be running up to 100 ppm faster than the client's
clock, apply the corrections to the NTP offset and peer delay. Don't
correct the root delay to not change the estimated maximum error.
2023-09-26 15:14:13 +02:00

428 lines
11 KiB
C
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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, 2021
*
* 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;
uint32_t ef_type;
int n, sel_option;
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.nts = 0;
src->params.nts_port = SRC_DEFAULT_NTSPORT;
src->params.copy = 0;
src->params.ext_fields = 0;
src->params.authkey = INACTIVE_AUTHKEY;
src->params.cert_set = SRC_DEFAULT_CERTSET;
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.max_delay_quant = 0.0;
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, "copy")) {
src->params.copy = 1;
} else if (!strcasecmp(cmd, "iburst")) {
src->params.iburst = 1;
} else if (!strcasecmp(cmd, "offline")) {
src->params.connectivity = SRC_OFFLINE;
} else if (!strcasecmp(cmd, "certset")) {
if (sscanf(line, "%"SCNu32"%n", &src->params.cert_set, &n) != 1)
return 0;
} 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, "extfield")) {
if (sscanf(line, "%"SCNx32"%n", &ef_type, &n) != 1)
return 0;
switch (ef_type) {
case NTP_EF_EXP_MONO_ROOT:
src->params.ext_fields |= NTP_EF_FLAG_EXP_MONO_ROOT;
break;
case NTP_EF_EXP_NET_CORRECTION:
src->params.ext_fields |= NTP_EF_FLAG_EXP_NET_CORRECTION;
break;
default:
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, "maxdelayquant")) {
if (sscanf(line, "%lf%n", &src->params.max_delay_quant, &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, "nts")) {
src->params.nts = 1;
} else if (!strcasecmp(cmd, "ntsport")) {
if (sscanf(line, "%d%n", &src->params.nts_port, &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, "%d%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 if ((sel_option = CPS_GetSelectOption(cmd)) != 0) {
src->params.sel_options |= sel_option;
} else {
return 0;
}
}
return 1;
}
/* ================================================== */
int
CPS_GetSelectOption(char *option)
{
if (!strcasecmp(option, "noselect")) {
return SRC_SELECT_NOSELECT;
} else if (!strcasecmp(option, "prefer")) {
return SRC_SELECT_PREFER;
} else if (!strcasecmp(option, "require")) {
return SRC_SELECT_REQUIRE;
} else if (!strcasecmp(option, "trust")) {
return SRC_SELECT_TRUST;
}
return 0;
}
/* ================================================== */
int
CPS_ParseAllowDeny(char *line, int *all, IPAddr *ip, int *subnet_bits)
{
char *p, *net, *slash;
uint32_t a, b, c;
int bits, len, n;
p = CPS_SplitWord(line);
if (strcmp(line, "all") == 0) {
*all = 1;
net = p;
p = CPS_SplitWord(p);
} else {
*all = 0;
net = line;
}
/* Make sure there are no other arguments */
if (*p)
return 0;
/* No specified address or network means all IPv4 and IPv6 addresses */
if (!*net) {
ip->family = IPADDR_UNSPEC;
*subnet_bits = 0;
return 1;
}
slash = strchr(net, '/');
if (slash) {
if (sscanf(slash + 1, "%d%n", &bits, &len) != 1 || slash[len + 1] || bits < 0)
return 0;
*slash = '\0';
} else {
bits = -1;
}
if (UTI_StringToIP(net, ip)) {
if (bits >= 0)
*subnet_bits = bits;
else
*subnet_bits = ip->family == IPADDR_INET6 ? 128 : 32;
return 1;
}
/* Check for a shortened IPv4 network notation using only 1, 2, or 3 decimal
numbers. This is different than the numbers-and-dots notation accepted
by inet_aton()! */
a = b = c = 0;
n = sscanf(net, "%"PRIu32"%n.%"PRIu32"%n.%"PRIu32"%n", &a, &len, &b, &len, &c, &len);
if (n > 0 && !net[len]) {
if (a > 255 || b > 255 || c > 255)
return 0;
ip->family = IPADDR_INET4;
ip->addr.in4 = (a << 24) | (b << 16) | (c << 8);
if (bits >= 0)
*subnet_bits = bits;
else
*subnet_bits = n * 8;
return 1;
}
/* The last possibility is a hostname */
if (bits < 0 && DNS_Name2IPAddress(net, ip, 1) == DNS_Success) {
*subnet_bits = ip->family == IPADDR_INET6 ? 128 : 32;
return 1;
}
return 0;
}
/* ================================================== */
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 **type, 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) {
*type = s2;
*key = s3;
} else {
*type = "MD5";
*key = s2;
}
return 1;
}
/* ================================================== */
int
CPS_ParseRefid(char *line, uint32_t *ref_id)
{
int i;
for (i = *ref_id = 0; line[i] && !isspace((unsigned char)line[i]); i++) {
if (i >= 4)
return 0;
*ref_id |= (uint32_t)line[i] << (24 - i * 8);
}
return i;
}
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