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007a1ae4fef36cec10742e2bb05e37acd02f2b96
chrony/cmdparse.c
Miroslav Lichvar 007a1ae4fe ntp: update NTP-over-PTP support 
Update the support for NTP over PTP to the latest specification
(currently in the RFC editor queue). Switch the NTP TLV to the
organization-specific TLV using the IANA OUI and assigned TLV
subtype 0x1. The Network Correction extension field has been
assigned type 0x10A. The extfield option accepts F324 as an alias
for 10A to not break existing configurations. Drop the experimental
status.
2025-11-26 13:53:28 +01:00

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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, 2021, 2025
*
* 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"
/* ================================================== */
#define SSCANF_IN_RANGE(s, f, x, n, min, max) \
(sscanf((s), (f), (x), (n)) == 1 && *(x) >= (min) && *(x) <= (max))
/* ================================================== */
CPS_Status
CPS_ParseNTPSourceAdd(char *line, CPS_NTP_Source *src)
{
char *hostname, *cmd;
uint32_t ef_type;
int n, sel_option;
src->family = IPADDR_UNSPEC;
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.max_unreach = SRC_DEFAULT_MAXUNREACH;
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 CPS_MissingArgument;
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 CPS_InvalidValue;
} else if (!strcasecmp(cmd, "key")) {
if (sscanf(line, "%"SCNu32"%n", &src->params.authkey, &n) != 1 ||
src->params.authkey == INACTIVE_AUTHKEY)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "asymmetry")) {
if (sscanf(line, "%lf%n", &src->params.asymmetry, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "extfield")) {
if (sscanf(line, "%"SCNx32"%n", &ef_type, &n) != 1)
return CPS_InvalidValue;
switch (ef_type) {
case NTP_EF_NET_CORRECTION:
case 0xF324:
src->params.ext_fields |= NTP_EF_FLAG_NET_CORRECTION;
break;
case NTP_EF_EXP_MONO_ROOT:
src->params.ext_fields |= NTP_EF_FLAG_EXP_MONO_ROOT;
break;
default:
return CPS_InvalidValue;
}
} else if (!strcasecmp(cmd, "filter")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.filter_length, &n, 0, INT_MAX))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "ipv4")) {
src->family = IPADDR_INET4;
} else if (!strcasecmp(cmd, "ipv6")) {
src->family = IPADDR_INET6;
} else if (!strcasecmp(cmd, "maxdelay")) {
if (sscanf(line, "%lf%n", &src->params.max_delay, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "maxdelayratio")) {
if (sscanf(line, "%lf%n", &src->params.max_delay_ratio, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "maxdelaydevratio")) {
if (sscanf(line, "%lf%n", &src->params.max_delay_dev_ratio, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "maxdelayquant")) {
if (sscanf(line, "%lf%n", &src->params.max_delay_quant, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "maxpoll")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.maxpoll, &n, -32, 32))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "maxsamples")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.max_samples, &n, 0, INT_MAX))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "maxsources")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.max_sources, &n, 1, INT_MAX))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "maxunreach")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.max_unreach, &n, 0, INT_MAX))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "mindelay")) {
if (sscanf(line, "%lf%n", &src->params.min_delay, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "minpoll")) {
if (sscanf(line, "%d%n", &src->params.minpoll, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "minsamples")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.min_samples, &n, 0, INT_MAX))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "minstratum")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.min_stratum, &n, 0, NTP_MAX_STRATUM))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "nts")) {
src->params.nts = 1;
} else if (!strcasecmp(cmd, "ntsport")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.nts_port, &n, 0, 65535))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "offset")) {
if (sscanf(line, "%lf%n", &src->params.offset, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "port")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->port, &n, 0, 65535))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "polltarget")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.poll_target, &n, 1, INT_MAX))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "presend")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.presend_minpoll, &n, -32, 32))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "version")) {
if (!SSCANF_IN_RANGE(line, "%d%n", &src->params.version, &n, 1, NTP_VERSION))
return CPS_InvalidValue;
} 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 CPS_InvalidOption;
}
}
return CPS_Success;
}
/* ================================================== */
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;
}
/* ================================================== */
CPS_Status
CPS_ParseLocal(char *line, int *stratum, int *orphan, double *distance, double *activate,
double *wait_synced, double *wait_unsynced)
{
int n;
char *cmd;
*stratum = 10;
*distance = 1.0;
*activate = 0.0;
*orphan = 0;
*wait_synced = 0;
*wait_unsynced = -1.0;
while (*line) {
cmd = line;
line = CPS_SplitWord(line);
if (!strcasecmp(cmd, "stratum")) {
if (!SSCANF_IN_RANGE(line, "%d%n", stratum, &n, 1, NTP_MAX_STRATUM - 1))
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "orphan")) {
*orphan = 1;
n = 0;
} else if (!strcasecmp(cmd, "distance")) {
if (sscanf(line, "%lf%n", distance, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "activate")) {
if (sscanf(line, "%lf%n", activate, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "waitsynced")) {
if (sscanf(line, "%lf%n", wait_synced, &n) != 1)
return CPS_InvalidValue;
} else if (!strcasecmp(cmd, "waitunsynced")) {
if (sscanf(line, "%lf%n", wait_unsynced, &n) != 1)
return CPS_InvalidValue;
} else {
return CPS_InvalidOption;
}
line += n;
}
if (*wait_unsynced < 0.0)
*wait_unsynced = *orphan ? 300 : 0.0;
return CPS_Success;
}
/* ================================================== */
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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