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#!/usr/bin/env tclsh
## -*- tcl -*-
# rdate.tcl - Copyright (C) 2003 Pat Thoyts <patthoyts@users.sourceforge.net>
#
# This is a sample implementation of the rdate(8) utility written using the
# tcllib ntp time package.
#
# -------------------------------------------------------------------------
# See the file "license.terms" for information on usage and redistribution
# of this file, and for a DISCLAIMER OF ALL WARRANTIES.
# -------------------------------------------------------------------------
#
# $Id: rdate.tcl,v 1.4 2009/01/30 04:18:14 andreas_kupries Exp $
package require time; # tcllib 1.4
proc usage {} {
set s {usage: rdate [-psa] [-utS] host
-p Do not set, just print the remote time.
-s Do not print the time. [NOT IMPLEMENTED]
-a Use the adjtime(2) call to gradually skew the local time to the
remote time instead of just jumping. [NOT IMPLEMENTED]
-u Use UDP (default if available)
-t Use TCP
-S Use SNTP protocol (RFC 2030) (default is TIME, RFC 868)
}
return $s
}
proc Error {message} {
puts stderr $message
exit 1
}
proc rdate {args} {
# process the command line options.
array set opts {-p 0 -s 0 -a 0 -t 0 -u x -S 0}
while {[string match -* [set option [lindex $args 0]]]} {
switch -exact -- $option {
-p { set opts(-p) 1 }
-u { set opts(-t) 0 }
-t { set opts(-t) 1 }
-s { Error "not implemented: use rdate(8)" }
-a { Error "not implemented: use rdate(8)" }
-S { set opts(-S) 1 }
-T { set opts(-S) 0 }
-- { ::time::Pop args; break }
default {
set err [join [lsort [array names opts -*]] ", "]
Error "bad option $option: must be $err"
}
}
::time::Pop args
}
# Check that we have a host to talk to.
if {[llength $args] != 1} {
Error [usage]
}
set host [lindex $args 0]
# Construct the time command - optionally force the protocol to tcp
set cmd ::time::gettime
if {$opts(-S)} {
set cmd ::time::getsntp
}
if {$opts(-t)} {
lappend cmd -protocol tcp
}
lappend cmd $host
# Perform the RFC 868 query (synchronously)
set tok [eval $cmd]
# Check for errors or extract the time in the unix epoch.
set t 0
if {[::time::status $tok] == "ok"} {
set t [::time::unixtime $tok]
::time::cleanup $tok
} else {
set msg [::time::error $tok]
::time::cleanup $tok
Error $msg
}
# Display the time.
if {$opts(-p)} {
puts [clock format $t]
}
return 0
}
if {! $tcl_interactive} {
eval rdate $argv
}
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