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Diffstat (limited to 'sntp/sntp-opts.def')
| -rw-r--r-- | sntp/sntp-opts.def | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/sntp/sntp-opts.def b/sntp/sntp-opts.def new file mode 100644 index 0000000..86e17c9 --- /dev/null +++ b/sntp/sntp-opts.def @@ -0,0 +1,319 @@ +/* -*- Mode: Text -*- */ + +autogen definitions options; + +#include autogen-version.def +#include copyright.def + +prog-name = "sntp"; +prog-title = "standard Simple Network Time Protocol client program"; +argument = '[ hostname-or-IP ...]'; + +#include homerc.def + +long-opts; + +config-header = "config.h"; + +environrc; + +#include version.def + +flag = { + name = ipv4; + value = 4; + flags-cant = ipv6; + descrip = "Force IPv4 DNS name resolution"; + doc = <<- _EndOfDoc_ + Force DNS resolution of the following host names on the command line + to the IPv4 namespace. + _EndOfDoc_; +}; + +flag = { + name = ipv6; + value = 6; + flags-cant = ipv4; + descrip = "Force IPv6 DNS name resolution"; + doc = <<- _EndOfDoc_ + Force DNS resolution of the following host names on the command line + to the IPv6 namespace. + _EndOfDoc_; +}; + +flag = { + name = authentication; + value = a; + descrip = "Enable authentication with the key @var{auth-keynumber}"; + arg-type = number; + arg-name = "auth-keynumber"; + doc = <<- _EndOfDoc_ + Enable authentication using the key specified in this option's + argument. The argument of this option is the @option{keyid}, a + number specified in the @option{keyfile} as this key's identifier. + See the @option{keyfile} option (@option{-k}) for more details. + _EndOfDoc_; +}; + +flag = { + name = broadcast; + value = b; + descrip = "Listen to the address specified for broadcast time sync"; + arg-type = string; + arg-name = "broadcast-address"; + max = NOLIMIT; + stack-arg; + doc = <<- _EndOfDoc_ + If specified @code{sntp} will listen to the specified address + for NTP broadcasts. The default maximum wait time + can (and probably should) be modified with @option{-t}. + _EndOfDoc_; +}; + +flag = { + name = concurrent; + value = c; + descrip = "Concurrently query all IPs returned for host-name"; + arg-type = string; + arg-name = "host-name"; + max = NOLIMIT; + stack-arg; + doc = <<- _EndOfDoc_ + Requests from an NTP "client" to a "server" should never be sent + more rapidly than one every 2 seconds. By default, any IPs returned + as part of a DNS lookup are assumed to be for a single instance of + @code{ntpd}, and therefore @code{sntp} will send queries to these IPs + one after another, with a 2-second gap in between each query. + + The @option{-c} or @option{--concurrent} flag says that any IPs + returned for the DNS lookup of the supplied host-name are on + different machines, so we can send concurrent queries. + _EndOfDoc_; +}; + +#include debug-opt.def + +flag = { + name = gap; + value = g; + descrip = "The gap (in milliseconds) between time requests"; + arg-type = number; + arg-name = "milliseconds"; + arg-default = 50; + doc = <<- _EndOfDoc_ + Since we're only going to use the first valid response we get and + there is benefit to specifying a good number of servers to query, + separate the queries we send out by the specified number of + milliseconds. + _EndOfDoc_; +}; + +flag = { + name = kod; + value = K; + arg-type = file; + arg-name = "file-name"; + arg-default = "/var/db/ntp-kod"; + descrip = "KoD history filename"; + doc = <<- _EndOfDoc_ + Specifies the filename to be used for the persistent history of KoD + responses received from servers. + _EndOfDoc_; +}; + +flag = { + name = keyfile; + value = k; + descrip = "Look in this file for the key specified with @option{-a}"; + arg-type = file; + arg-name = "file-name"; + doc = <<- _EndOfDoc_ + This option specifies the keyfile. + @code{sntp} will search for the key specified with @option{-a} + @file{keyno} in this file. See @command{ntp.keys(5)} for more + information. + _EndOfDoc_; +}; + +flag = { + name = logfile; + value = l; + arg-type = file; + arg-name = "file-name"; + descrip = "Log to specified logfile"; + doc = <<- _EndOfDoc_ + This option causes the client to write log messages to the specified + @file{logfile}. + _EndOfDoc_; +}; + +flag = { + name = steplimit; + value = M; + arg-type = number; + arg-range = "0->"; + descrip = "Adjustments less than @var{steplimit} msec will be slewed"; + doc = <<- _EndOfDoc_ + If the time adjustment is less than @file{steplimit} milliseconds, + slew the amount using @command{adjtime(2)}. Otherwise, step the + correction using @command{settimeofday(2)}. + _EndOfDoc_; +}; + +flag = { + name = ntpversion; + value = o; + descrip = "Send @var{int} as our NTP protocol version"; + arg-type = number; + arg-default = 4; + arg-range = "0->7"; + doc = <<- _EndOfDoc_ + When sending requests to a remote server, tell them we are running + NTP protocol version @file{ntpversion} . + _EndOfDoc_; +}; + +flag = { + name = usereservedport; + value = r; + descrip = "Use the NTP Reserved Port (port 123)"; + doc = <<- _EndOfDoc_ + Use port 123, which is reserved for NTP, for our network + communications. + _EndOfDoc_; +}; + +flag = { + name = step; + value = S; + descrip = "OK to 'step' the time with @command{settimeofday(2)}"; + doc = <<- _EndOfDoc_ + _EndOfDoc_; +}; + +flag = { + name = slew; + value = s; + descrip = "OK to 'slew' the time with @command{adjtime(2)}"; + doc = <<- _EndOfDoc_ + _EndOfDoc_; +}; + + +flag = { + name = timeout; + value = t; + descrip = "The number of seconds to wait for responses"; + arg-type = number; + arg-name = "seconds"; + arg-default = 5; + doc = <<- _EndOfDoc_ + When waiting for a reply, @code{sntp} will wait the number + of seconds specified before giving up. The default should be + more than enough for a unicast response. If @code{sntp} is + only waiting for a broadcast response a longer timeout is + likely needed. + _EndOfDoc_; +}; + +flag = { + name = "wait"; + descrip = "Wait for pending replies (if not setting the time)"; + disable = no; + enabled; + settable; + doc = <<- _EndOfDoc_ + If we are not setting the time, wait for all pending responses. + _EndOfDoc_; +}; + +/* explain: Additional information whenever the usage routine is invoked */ +explain = <<- _END_EXPLAIN + _END_EXPLAIN; + +doc-section = { + ds-type = 'DESCRIPTION'; + ds-format = 'mdoc'; + ds-text = <<- _END_PROG_MDOC_DESCRIP +.Nm +can be used as an SNTP client to query a NTP or SNTP server and either display +the time or set the local system's time (given suitable privilege). It can be +run as an interactive command or from a +.Ic cron +job. + +NTP (the Network Time Protocol) and SNTP (the Simple Network Time Protocol) +are defined and described by RFC 5905. + +.Pp +The default is to write the estimated correct local date and time (i.e. not +UTC) to the standard output in a format like: + +.Ic "'1996-10-15 20:17:25.123 (+0800) +4.567 +/- 0.089 [host] IP sN'" + +where the +.Ic "'(+0800)'" +means that to get to UTC from the reported local time one must +add 8 hours and 0 minutes, +the +.Ic "'+4.567'" +indicates the local clock is 4.567 seconds behind the correct time +(so 4.567 seconds must be added to the local clock to get it to be correct). +Note that the number of decimals printed for this value will change +based on the reported precision of the server. +.Ic "'+/- 0.089'" +is the reported +.Em synchronization distance +(in seconds), which represents the maximum error due to all causes. +If the server does not report valid data needed to calculate the +synchronization distance, this will be reported as +.Ic "'+/- ?'" . +If the +.Em host +is different from the +.Em IP , +both will be displayed. +Otherwise, only the +.Em IP +is displayed. +Finally, the +.Em stratum +of the host is reported. + _END_PROG_MDOC_DESCRIP; +}; + +doc-section = { + ds-type = 'USAGE'; + ds-format = 'mdoc'; + ds-text = <<- _END_MDOC_USAGE +.Bl -tag -width indent +.It Li "sntp ntpserver.somewhere" +is the simplest use of this program +and can be run as an unprivileged command +to check the current time and error in the local clock. +.It Li "sntp -a ntpserver.somewhere" +With suitable privilege, +run as a command +or from a +.Xr cron 8 +job, +.Ic "sntp -a" +will reset the local clock from a synchronized specified server, +like the (deprecated) +.Xr ntpdate 1ntpdatemdoc , +or +.Xr rdate 8 +commands. +.El + _END_MDOC_USAGE; +}; + +doc-section = { + ds-type = 'AUTHORS'; + ds-format = 'mdoc'; + ds-text = <<- _END_MDOC_AUTHORS +.An "Johannes Maximilian Kuehn" +.An "Harlan Stenn" +.An "Dave Hart" + _END_MDOC_AUTHORS; +}; |