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# getNTPserversNew.py
#
# Demonstration of the parsing module, implementing a HTML page scanner,
# to extract a list of NTP time servers from the NIST web site.
#
# Copyright 2004-2010, by Paul McGuire
# September, 2010 - updated to more current use of setResultsName, new NIST URL
#
from pyparsing import (Word, Combine, Suppress, SkipTo, nums, makeHTMLTags,
delimitedList, alphas, alphanums)
try:
import urllib.request
urlopen = urllib.request.urlopen
except ImportError:
import urllib
urlopen = urllib.urlopen
integer = Word(nums)
ipAddress = Combine( integer + "." + integer + "." + integer + "." + integer )
hostname = delimitedList(Word(alphas,alphanums+"-_"),".",combine=True)
tdStart,tdEnd = makeHTMLTags("td")
timeServerPattern = (tdStart + hostname("hostname") + tdEnd +
tdStart + ipAddress("ipAddr") + tdEnd +
tdStart + SkipTo(tdEnd)("loc") + tdEnd)
# get list of time servers
nistTimeServerURL = "http://tf.nist.gov/tf-cgi/servers.cgi#"
serverListPage = urlopen( nistTimeServerURL )
serverListHTML = serverListPage.read().decode("UTF-8")
serverListPage.close()
addrs = {}
for srvr,startloc,endloc in timeServerPattern.scanString( serverListHTML ):
print("%s (%s) - %s" % (srvr.ipAddr, srvr.hostname.strip(), srvr.loc.strip()))
addrs[srvr.ipAddr] = srvr.loc
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