#!/usr/bin/env python
# $Id: hbd,v 1.38 2013/07/14 02:25:05 andreas Exp $
# Wait for heartbeat messages and act on them (or their absence)
#
VER = 3.00

import time
import os
import string
import sys
import socket
import atexit
import select
import SocketServer
import BaseHTTPServer
import getopt
import signal
import cPickle
import smtplib
import traceback
import urllib
import urlparse
import httplib
import threading
import Queue
import md5
import json
import zlib

from subprocess import Popen, STDOUT, PIPE

from hbdclass import *


SEND_EMAIL=False
SEND_PUSHOVER=True

DEBUG = 0

MAXRECV = 32767
LOGFILE = "/home/andreas/public_html/messages/andreas"
PICKFILE = "/var/tmp/hbd.pick"
AEMAIL = ["andreas@wrede.ca"]
NAME = "heatbeat"
SMTPSERVER = "localhost"

msgs = []

#AEW upcount = 0
PORT = 50003
TPORT = 50004
THOST = ""

verbose = False

INTERVAL = 10
GRACE = 2
DROPOVERDUE = 7*24*3600

os.environ['TZ'] = 'EST5EDT'

tsfm=["%H","%d","%U"]
lastfm=["","",""]


tcss = """<script src="https://home.wrede.ca/pr/sorttable.js"></script>
<style>
#ntable {
    border-collapse: collapse;
}

#wide-ntable {
    border-collapse: collapse;
    width: 100%;
}

#ntable td, #ntable th {
    border: 1px solid #ddd;
    text-align: left;
    padding: 1px;
}

#ntable tr:nth-child(even){background-color: #f2f2f2}

#ntable tr:hover {background-color: #ddd;}

#ntable th {
    padding-top: 12px;
    padding-bottom: 12px;
    background-color: #9d9d9d;
    color: white;
}
</style> """


def handler(signum, frame):
	global running, sig
	sig = signum
	if not running:
		if verbose:
			sys.stderr.write("NOT runing signal: %s running: %d" % (sig, running))
		sys.exit(2)
	if verbose:
		sys.stderr.write("signal: %s running: %s frame: %s" % (sig, running, frame))


def shortname(name):
	r = string.split(name, '.')
	return r[0]


class NullDevice:
	def write(self, s):
		pass


class LogDevice:
	def __init__(self):
		self.fh = open("/tmp/log1","a")

	def write(self, s):
		self.fh.write(s)
		self.fh.flush()


def dicttos(ID, d, compress=False):
	s = []
	for k in d:
		if type(d[k]) == type(1.2):
			s.append("%s=%0.5f" % (k, d[k]))
		else:
			s.append("%s=%s" % (k, d[k]))
	pk = ";".join(s)
	if compress:
		zpk = zlib.compress(pk, 6)
		ID = "!"+ID
	else:
		zpk = pk
	return ID + ":" + zpk


def stodict(msg):
	d = {}
	r0 = msg.split(':',1)
	if len(r0) == 1:
		return None
	if r0[0][0] == '!':		# compressed
		pk = zlib.decompress(msg[len(r0[0])+1:])
		d['ID'] = r0[0][1:]
	else:
		pk = r0[1]
		d['ID'] = r0[0]
	r = pk.split(';')
	for v in r:
		vr = v.split('=', 1)
		k = vr[0].strip()
		if len(vr) == 1:
			d[k] = None
		else:
			v = vr[1].strip()
			if v[0].isdigit():
				v = eval(v)
			d[k] = v
	return d


def oldmtodict(msg):
	return stodict('HTB:'+msg)


def email(s, msg):
	if not SEND_EMAIL:
		return
	ret = "OK"
	toaddrs = AEMAIL
	fromemail = "aew.heartbeat@wrede.ca"
	subj = "Info from %s: %s" % (NAME, s)
	date = time.strftime("%a, %d %b %Y %H:%M:%S %z", time.localtime())
	body = "To: %s\nFrom: %s\nSubject: %s\nDate: %s\n\n%s" % (toaddrs[0], fromemail, subj, date, msg)
	try:
		server = smtplib.SMTP(SMTPSERVER)
		if DEBUG > 0: server.set_debuglevel(1)
		server.sendmail(fromemail, toaddrs, body)
	except smtplib.SMTPRecipientsRefused, errs:
		log(None, "cannot send email: %s\n" % (errs))
		ret = "Fail"
	except:
		print("smtp error: "+traceback.format_exc())
		saveandrestart()
	try:
		server.quit()
	except:
		pass
	return ret


def pushover(msg):
	if not SEND_PUSHOVER:
		return
	conn = httplib.HTTPSConnection("api.pushover.net:443")
	try:
		conn.request("POST", "/1/messages.json",
			urllib.urlencode({
			"token": "ac7NLX2rPjXFareeDgLpXNoDf4iFmf",
			"user": "uDhH33UjQQDYtNzJb1ThRiWb9ingGK",
			"message": msg, }), { "Content-type": "application/x-www-form-urlencoded" })
		conn.getresponse()
	except:
		pass


# nsupdate:  set the DNS A record for a fqdn
#	return: None if ok, else error text
def nsupdate(hostname, newip):
	D = {}
	D['domain'] = 'dy.wapanafa.org'
	D['fqdn'] = '%s.dy.wapanafa.org' % hostname
	D['dnsttl'] = '5'
	D['newip'] = newip
	D['ts'] = time.strftime('%Y-%m-%d.%H:%M:%S', time.gmtime())
	if newip.find(":") > 0:
		nsup = """update delete %(fqdn)s AAAA
update add %(fqdn)s %(dnsttl)s AAAA %(newip)s
update delete %(fqdn)s TXT
update add %(fqdn)s %(dnsttl)s TXT "Created: %(ts)s"
send
answer

""" % D
	else:
		nsup = """update delete %(fqdn)s A
update add %(fqdn)s %(dnsttl)s A %(newip)s
update delete %(fqdn)s TXT
update add %(fqdn)s %(dnsttl)s TXT "Created: %(ts)s"
send
answer

""" % D

	if DEBUG > 0: log(None, "DBG: nsup %s" % nsup)
	cmd = ["/usr/local/bin/nsupdate", "-k", "/etc/dhcpc/K%(domain)s.+157+00000." % D, "-v"]
	if DEBUG > 0: log(None, "DBG: cmd %s" % cmd)
	try:
		p = Popen(cmd, shell=False, bufsize=1, stdin=PIPE, stdout=PIPE, stderr=STDOUT)
	except OSError, e:
		return "nsupdate: execution failed: %s" % e
	except:
		return "nsupdate: some error occured"

	(output, err) = p.communicate(nsup)
	if output.find('status: NOERROR') >= 0:
		return None
	return output


#
def dur(sec):
	sec = int(sec)
	h = sec / 3600
	m = (sec - h * 3600) / 60
	s = (sec - h * 3600) % 60
	if h > 0:
		return "%d:%02d:%02d" % (h, m, s)
	if m > 0:
		return "%d:%02d" % (m, s)
	return "0:%02d" % s


def fixsort():
	s = Host.hosts.keys()
	s.sort()
	x = 0
	for n in s:
		Host.hosts[n].num = x
		x += 1

#
def on_exit():
	if DEBUG > 0: sys.stderr.write("on_exit\n")
	try:
		logf.close()
	except:
		pass
	print "exit"


def initlog(logfile):
	try:
		return open(logfile, "a+")
	except:
		pass
	return open(logfile, "w")


#
#
def checkoverdue():
	now = time.time()
	for h in Host.hosts.keys():
		pmsg = []
		for c in Host.hosts[h].connections:
			conn = Host.hosts[h].connections[c]
			if conn.state == Connection.down:
				continue
			timeout = Host.hosts[h].interval + grace
			if conn.state == Connection.up and (now - conn.lastbeat) > timeout:
				conn.newstate(Connection.overdue, now, grace)
				pmsg.append(conn.afam)
			if conn.state == Connection.overdue and (now - conn.lastbeat) > DROPOVERDUE:
				conn.newstate(Connection.unknown, conn.lastbeat)
		if pmsg != []:
			if h in watchhosts:
				email("overdue", "%s overdue" % " and ".join(pmsg))
				pushover("%s %s overdue" % (h, " and ".join(pmsg)))
			log(h, "%s overdue" % " and ".join(pmsg))


def log(host, m, service=None):
	if DEBUG > 0: print "Log: %s %s" % (host, m)
	now = time.time()
	ts = time.strftime("%b %d %H:%M:%S", time.localtime(now))
	if service:
		srv = "service %s: " % service
	else:
		srv = ""
	if host:
		hst = "%s " % host
	else:
		hst = ""

	msg = "%s: %s%s%s\n" % (ts, hst, srv, m)
	msgs.append(msg)
	if logfmt == "msg":
		m2 = "%d|%s|%s\n" % (now, hst, m)
	else:
		m2 = msg
	logf.write(m2)
	logf.flush()
	pickleit()


def dnsupdatethread():
	while True:
		name, addr = Host.dnsQ.get()
		m = "changed address to %s" % (addr)
		err = nsupdate(name, addr)
		if err:
			m += ", DNS update failed: %s" % err
			email("error: nsupdate failed", "%s: %s" % (name, m))
		else:
			m += ", DNS updated."
		Host.dnsQ.task_done()
		log(name, m)

#
#
#
#
def readsock(sock):
	global now
	if DEBUG > 3: sys.stderr.write("readsock recfrom start")
	data, addrp = sock.recvfrom(MAXRECV)
	now = time.time()
	if DEBUG > 2: sys.stderr.write("readsock = %s, %s\n" % (data,addrp))
	msg = stodict(data)
	if not msg:		# Old hbc client
		if verbose: print "old hbc:", data
		oldclient = True
		msg = oldmtodict(data)
	else:
		oldclient = False
	if DEBUG > 2: print "readsock = %s, %s" % (msg,addrp)

	addr = addrp[0:2]
	name = shortname(msg.get('name', "unknown"))
	if not name in Host.hosts:		# was: hosts.has_key(name):
		host = Host(name)
		host.dyn = h in dyndnshosts
		if verbose: print "XX: New host, num now %s" % (len(Host.hosts))
		newh=True
	else:
		host = Host.hosts[name]
		newh=False

	cid = msg.get('id', 0)
	rtt = msg.get('rtt',None)

	if msg['ID'] == 'HTB':
		host.doesack = msg.get('acks', -1)
	host.setcver(msg.get('ver', 0))

	interval = int(msg.get('interval', 0))
	shutdown = msg.get('shutdown', 0)
	service = msg.get('service', "unknown")
	message = msg.get('msg', None)
	boot = msg.get('boot', 0)

	if boot:
		log(name, "booted")
		if name in watchhosts:
			email("booted", m)
			pushover(m)
	if message:
		log(name, "msg: %s" % message, service=service)
		if name in watchhosts:
			email("msg", message)
			pushover(message)

	conn, res = host.conndata(cid, addr[0], rtt, now)
	if res:
		log(name, res)
		if name in watchhosts:
			email("address change", "%s %s" % (host.name, res))
			pushover("%s %s" % (host.name, res))

	if conn.getstate() != Connection.up:  #  XXX  and interval > 0:
		lasts = conn.state
		d = conn.newstate(Connection.up, now)
		m = "%s back after being %s for %s" % (conn.afam, lasts, dur(d))
		log(name, m)
		if name in watchhosts:
			email("%s back" % conn.afam, name)
			pushover("%s %s is back" % (name, conn.afam))

	if boot or newh:
		host.upcount = host.doesack
	else:
		host.upcount += 1


	if shutdown:
		log(name, "%s shutdown" % conn.afam)
		if name in watchhosts:
			email("shutdown", "%s %s shutdown" % (name, conn.afam))
			pushover("%s %s shutdown" % (name, conn.afam))
		conn.newstate(Connection.down, now)

	if interval > 0:
		host.interval = interval

	rmsg = {'time': time.time()}
	op = 'ACK'
	if host.cver < 1:
		opkt = 'ACK'
		rmsg = 'ACK'
	else:
		opkt = dicttos('ACK', rmsg, host.cver > 1)		# clients w/ ver 2+ can cope
	try:
		ss=sock.sendto(opkt, addr)
	except:
		pass	# XXX return pkg failes
	if DEBUG > 2: print "sendto1: %s (%s) %s %s" % (addr, len(opkt), op, str(rmsg)[:50])

	# send any commands we have queued
	while len(host.cmds):
		op, rmsg = host.cmds[0]
		if op == 'CMD':
			email("%s cmd exec" % name, "command '%s' sent" %  rmsg)
			del host.cmds[0]
			log(name, "command sent")
			if host.cver < 1:
				rmsg = rmsg['cmd']
		elif op == 'UPD':
			del host.cmds[0]
			log(name, "update initiated")
			if host.cver < 1:
				log(name," ver 0 does not support UPD")
				continue
		if host.cver < 1:
			opkt = rmsg
			op = ""
		else:
			opkt = dicttos(op, rmsg, True)
		try:
			ss=sock.sendto(opkt, addr)
		except Exception as e:
			print "opkt len is %s" % len(opkt)
			print "cannot send: %s" % e

		if verbose: print "sendto2: %s (%s) %s %s" % (addr, len(opkt), op, str(rmsg)[:50])
		if DEBUG > 2: print "msg from %s,%s, sent %s bytes back" % (addr[0], addr[1], ss)



def updatecode(ucode, uname):

	fail = None
	try:
		fh = open(ucode, "r")
		new_code = fh.read()
		fh.close()
	except Exception as e:
		fail = "cannot read new code: %s" % e
	if not fail:
		m = md5.new()
		m.update(new_code)
		icsum = m.hexdigest()
		rmsg = {'csum': icsum, 'code': new_code.encode('base64','strict') }
		Host.hosts[uname].cmds.append(('UPD',rmsg))
	return fail

#
# Web Server
#
class HttpServer(SocketServer.ThreadingMixIn, BaseHTTPServer.HTTPServer):
	allow_reuse_address = True
	def threaded():
		pass
#
#
class HttpHandler(BaseHTTPServer.BaseHTTPRequestHandler):

	server_version = "HeartbeatHTTP/%s" % VER

	def version_string(self):
		return self.server_version


	def handle(self):
		try:
			return BaseHTTPServer.BaseHTTPRequestHandler.handle(self)
		except Exception as e:
			self.log_error("Request went away: %r", e)
			self.close_connection = 1
			return


	def do_HEAD(self):
		self.setheaders(200)


	def setheaders(self, code,  headerdict):
		self.send_response(code)
		self.send_header("Last-Modified", time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(now)))
#		self.send_header("Accept-Ranges","bytes")
#		self.send_header("Connection","close")
		for h in headerdict:
			self.send_header(h, headerdict[h])
		self.end_headers()


	def buildhead(self, title="Heartbeat", refresh=None, extras=None):
		res=[]
		res.append('<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">')
		res.append("<html>")
		res.append("<head>")
		res.append('<title>%s</title>' % (title))
		if refresh:
			res.append("<meta http-equiv = Refresh content = %d>\n" % refresh)
		if extras:
			res.append(extras)
		res.append("</head>")
		res.append('<body BGCOLOR = "#FFFFFF" LINK = "#008000" VLINK = "#008000">')
		return res


	def buildpage(self):
		res=self.buildhead(refresh=60, extras=tcss)
		res.append("<H2>Heartbeat status %s</h2>" % VER)


		res += ubHost.buildhosttable()
		res += ubHost.buildmsgtable(msgs)
		res.append('<p> %s (%s)</p>' % (time.strftime("%H:%M:%S", time.localtime(now)), os.environ.get('TZ', 'CET-1CDT')))
		res.append("</body></html>")
		return res


	def builderror(self, code, cause, lcause):
		res=[]
		res.append('<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">')
		res.append('<html><head>')
		res.append('<title>%s %s</title>' % (code, cause))
		res.append('</head><body>')
		res.append('<h1>%s</h1>' % (cause))
		res.append('<p>%s</p>' % lcause)
		res.append('<hr>')
		res.append('<address>hbd (Unix) Server at %s:%s</address>' % (hbd_host, hbd_port))
		res.append('</body></html>')
		return code, res


	def do_GET(self):
		global sig
		code = 200
		xsig = 0
		rqAcceptEncoding =  self.headers.getheader('Accept-encoding',{})
		headerdict =  {"Content-Type": "text/html; charset = ISO-8859-1" }
		if DEBUG > 2: sys.stderr.write("handle\n")
		qr = urlparse.urlparse(self.path)
		qa = urlparse.parse_qs(qr.query)

		if DEBUG > 2: sys.stderr.write("handle = %s\n" % (qr.geturl()))
		if qr.path == "/":
			res=self.buildpage()

		elif qr.path == "/c":	# command on host /c?h=melschserver&c=sudo%20ls
			uname=qa.get('h',[None])[0]
			ucmd=qa.get('c', [None])[0]
			if not ucmd or not uname:
				code, res=self.builderror(400, 'Argument error', "need h= and c= arguments")
			elif not Host.hosts.has_key(uname):
				code, res=self.builderror(400, 'Data error', "h=%s not found" % uname)
			else:
				Host.hosts[uname].cmds.append(('CMD', {'cmd': urllib.unquote(ucmd)}))
				res=self.buildhead()
				res.append("cmd %s queued for host %s" % (uname, ucmd))

		elif qr.path == "/d":	# drop host  /d?h=melschserver
			uname=qa.get('h',[None])[0]
			if not uname:
				code, res=self.builderror(400, 'Argument error', "need h= argument")
			if not uname in Host.hosts:
				code, res=self.builderror(400, 'Data error', "h=%s not found" % uname)
			else:
				log(uname, "dropped")
#				for addr in Host.hosts[uname].0i
				del Host.hosts[uname]
				res=self.buildhead()
				res.append("Done")

		elif qr.path == "/n":   # register name
			uname=qa.get('h',[None])[0]
			if not uname:
				code, res=self.builderror(400, 'Argument error', "need h= argument")
			if not uname in Host.hosts:
				code, res=self.builderror(400, 'Data error', "h=%s not found" % uname)
			else:
				ll = Host.hosts[uname].registerDns()
				res.append(ll)
				log(uname, ll)

		elif qr.path == "/u":   # update
			uname=urllib.unquote(qa.get('h',[None])[0])
			ucode=qa.get('c', [None])[0]
			if not ucode or not uname:
				code, res=self.builderror(400, 'Argument error', "need h= and c= arguments")
			elif uname != 'All' and not  Host.hosts.has_key(uname):
				code, res=self.builderror(400, 'Data error', "h=%s not found" % uname)
			else:
				res=self.buildhead()
				if uname != 'All':
					names = [uname]
				else:
					names = []
					for n in Host.hosts:
						if Host.hosts[n].cver >= 2:		# earliest version that supports update
							names.append(n)
				for n in names:
					err = updatecode(ucode, n)
					res.append("update started for %s: %s<br>" % (n, err if err else "OK"))
				res.append("Done")

		elif qr.path == "/api/0/hosts":   # api access to host table
			headerdict = {"Content-Type": "application/json; charset=utf-8" }
			l=[]
			for h in Host.hosts:
				l.append(Host.hosts[h].jsons())
			res=["["+",".join(l)+"]"]

		elif qr.path == "/api/0/messages":   # api access to host table
			headerdict = {"Content-Type": "application/json; charset=utf-8" }
			l=msgs[len(msgs)-30:]
			res=[json.dumps(l)]

		elif qr.path == "/r":   # restart
			res=self.buildhead()
			res.append("restart request")
			xsig=signal.SIGHUP
			log(None, "restart request")

		else:
			code, res=self.builderror(404, "Not Found", "requested URL was not found on this server.")


		if 'deflate' in rqAcceptEncoding:
			headerdict['Content-Encoding'] = "deflate"
			towrite = zlib.compress(string.join(res, "\n"), 6)
		else:
			towrite = string.join(res, "\n")
		headerdict['Content-Length'] = len(towrite)
		headerdict['Cache-Control'] = 'private, must-revalidate, max-age=0'
		headerdict['Expires'] = 'Thu, 01 Jan 1970 00:00:00 GMT'
		self.setheaders(code, headerdict)
		self.wfile.write(towrite)

		if xsig:
			sig = xsig


def setrunning(new):
	global running
	if DEBUG > 0: sys.stderr.write("running is now = %s\n" % (new))
	running = new


def closeup():
	setrunning(False)
	try:
		sock.close()
	except:
		pass
	try:
		sock6.close()
	except:
		pass

	if DEBUG > 0: sys.stderr.write("asking http server to stop\n")
	try:
		serv.shutdown()
		if DEBUG > 0: sys.stderr.write("http server stopped\n")
	except Exception as e:
		if DEBUG > 0: sys.stderr.write("http server did NOT stop: %s\n" % str(e))

	try:
		serv.server_close()
	except:
		pass

	log(None, "restarting")
	try:
		logf.close()
	except:
		pass

#	signal.signal(signal.SIGTERM, 0)
	signal.signal(signal.SIGHUP, 0)


def restart():
	if verbose: print "execv %s %s" % (sys.argv[0], [sys.argv[0]]+cmdargs)
	os.execv(sys.argv[0], [sys.argv[0]]+cmdargs)
	print "should not be here"

def saveandrestart():
	closeup()
	restart()


def pickleit():
	pickf = open(pickfile, 'w')
	pick = cPickle.Pickler(pickf)
	pick.dump(Host.hosts)
	pick.dump(msgs)
	pick.dump(lastfm)
	pickf.close()


#
# Main
#

helpflag = False
forground = False
optlist = []
args = []
home = os.environ['HOME']
cmdargs = []
configfile = "%s/.hbrc" % home

try:
	optlist, args = getopt.getopt(sys.argv[1:], 'c:dfh:vx')
except:
	helpflag = True

for o, a in optlist:
	if o == '-c':
		configfile = a
		cmdargs += [o, a]
	if o == '-f':
		forground = True
		cmdargs += [o]
	elif o == '-h':
		helpflag = True
	elif o == '-v':
		verbose = True
		cmdargs += [o]
	elif o == '-x':
		DEBUG += 1
		cmdargs += [o]

if helpflag:
	print "hbc HeartBeatDaemon"
	print "usage: hbd [-dfhvx] [-c configfile]"
	print
	print "	-c configfile"
	print "	-d display"
	print "	-f run in foreground"
	print "	-h this help"
	print "	-v verbose"
	print "	-x increase debug lvl"
	print
	print """ config file can contain
logfile = /var/log/heartbeat.log
logfmt = [text|msg]
hb_port = 50003
interval = 20
hbd_port = 50004
hbd_host = www.domain.com
grace = 2
"""

	sys.exit(1)

#
# set defaults

hb_port = PORT
hbd_host = THOST
hbd_port = TPORT
pickfile = PICKFILE
logfile = LOGFILE
logfmt = "text"
interval = INTERVAL
grace = GRACE
watchhosts = []
dyndnshosts = []
drophosts = []

try:
	f = open(configfile, "r")
	if verbose:
		print "notice: using config file %s" % configfile
except:
	print "warning: running without config file: %s" % configfile
	f = None

if f:
	while 1:
		ls = f.readline()
		if len(ls) == 0:
			break
		l = ls[:-1].strip()
		if len(l) == 0 or l[0] == "#":
			continue
		if verbose:
			print "  %s" % l
		r = l.split('=')
		o = r[0].strip()
		try:
			a = eval(r[1].strip())
		except Exception as e:
			print "error: %s" % str(r)
			sys.exit(1)
		if o == 'interval':
			interval = a
		elif o == 'grace':
			grace = a
		elif o == 'hbd_port':
			hbd_port = a
		elif o == 'hbd_host':
			hbd_host = a
		elif o == 'pickfile':
			pickfile = a
		elif o == 'hb_port':
			hb_port = a
		elif o == 'logfile':
			logfile = a
		elif o == 'logfmt':
			logfmt = a
		elif o == 'watchhosts':
			watchhosts = a
		elif o == 'dyndnshosts':
			dyndnshosts = a
		elif o == 'drophosts':
			drophosts = a
	f.close()

if len(args) != 0:
	print "error: args"
	sys.exit(1)


if verbose:
	print "notice: logging to %s" % logfile
logf = initlog(logfile)

if 1 and os.path.exists(pickfile):
	if verbose: print "opening pickls %s" % pickfile
	pickf = open(pickfile, 'r')
	pick = cPickle.Unpickler(pickf)
	try:
		Host.hosts = pick.load()
		msgs = pick.load()
		try:
			lastfm = pick.load()
		except:
			lastfm = ["","",""]
		pickf.close()
	except Exception as e:
		print "load pickled failed: %s" % e
		os.unlink(pickfile)
	Connection.htab = {}
	for h in Host.hosts.keys():
		Host.hosts[h].dyn = h in dyndnshosts
		Host.hosts[h].fixup()
	for h in drophosts:
		if h in Host.hosts:
			del Host.hosts[h]
	if verbose: print "%s pickled hosts loaded" % len(Host.hosts)
else:
	if verbose: print "no pickled data"


now = time.time()
startsec = int(now) % interval


log(None, "Starting %s" % VER)
atexit.register(on_exit)

ilist = []

sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
sock.bind(("", hb_port))
sock.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
ilist.append(sock)

sock6 = socket.socket(socket.AF_INET6, socket.SOCK_DGRAM)
sock6.setsockopt(socket.SOL_SOCKET, socket.SO_REUSEADDR, 1)
sock6.bind(("", hb_port))
ilist.append(sock6)

#ilist.append(serv.fileno())

if not forground:
	pid = os.fork()
	if pid > 0:
		if verbose:
			print "daemoinizing... pid = %d" % pid
		sys.exit(0)

	verbose = False
	os.close(0)
	os.close(1)
	os.close(2)
	sys.stdin.close()
	if DEBUG > 0:
		sys.stdout = LogDevice()
		sys.stderr = LogDevice()
	else:
		sys.stdout = NullDevice()
		sys.stderr = NullDevice()
	os.chdir("/tmp")
	os.setsid()
	os.umask(0)

try:
	serv = HttpServer((hbd_host, hbd_port), HttpHandler)
except:
	print "failed to start server on %s:%s" % (hbd_host, hbd_port)
	sys.exit(1)

servthread = threading.Thread(target=serv.serve_forever)
servthread.daemon = True
servthread.start()

Host.dnsQ = Queue.Queue()
dnsT = threading.Thread(target=dnsupdatethread)
dnsT.daemon = True
dnsT.start()

running = True
sig = 0
signal.signal(signal.SIGTERM, handler)
signal.signal(signal.SIGHUP, handler)

next = int(now)+15   # 15 seconds time to settle after (re-)start
sleep = 1
firstcheck = int(now) + 15

while running:
	sr = None
	if DEBUG > 2: sys.stderr.write("about to sleep = %s\n" % (sleep))
	try:
		sr = select.select(ilist, [], [], sleep)
		now = time.time()
	except KeyboardInterrupt:
		sys.stderr.write("Keyboard Interrupt!\n")
		running = False
		closeup()
		continue
	except select.error, value:
		if value[0] != 4:		# interrupted system call
			sys.stderr.write("select err %s %s" % (select.error, value))
			#raise os.error, value
			continue
		continue
	except Exception as e:
		if DEBUG > 2: sys.stderr.write("select exception %s\n" % (str(e)))
		sys.exit(1)
	if DEBUG > 2: sys.stderr.write("woke from sleep = %s (%s)\n" % (str(sr), str(ilist)))
	for fh in sr[0]:
		if fh in [sock, sock6]:
			readsock(fh)
#		elif fh == serv.fileno():
#			serv.handle_request()
		else:
			sys.stderr.write("what happend just now?\n")
	if DEBUG > 2: sys.stderr.write("done handling, running is %s, sig is %s\n" % (running, sig))

	# check hour/day/week
	for v in xrange(3):
		fm=tsfm[v]
		ts=time.strftime(tsfm[v], time.localtime(now))
		if ts != lastfm[v]:
			lastfm[v]=ts
			for h in Host.hosts.keys():
				Host.hosts[h].hdwcounts[v] = [Host.hosts[h].doesack, Host.hosts[h].upcount]

	if now >= next and now >= firstcheck:
		next = now+1
		checkoverdue()

	sleep = next-now
	if sleep < 0:
		sys.stderr.write("sleep is negative! %s next = %s\n" % (sleep, next))
		sleep = 0
	if DEBUG > 2: sys.stderr.write("sleep = %s next = %s\n" % (sleep, next))

	if sig != 0:
		setrunning(False)



if sig == signal.SIGHUP:
	if DEBUG > 0: sys.stderr.write("signal 1 saveandrestart\n")
	saveandrestart()