855 lines
17 KiB
Python
Executable File
855 lines
17 KiB
Python
Executable File
#!/usr/bin/env python
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# $Id: hbd,v 1.38 2013/07/14 02:25:05 andreas Exp $
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# Wait for heartbeat messages and act on them (or their absence)
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#
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VER = 1.38
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import time, os, string, sys, socket, atexit, select, SocketServer, getopt, signal, cPickle, smtplib, traceback, urllib
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from subprocess import Popen, STDOUT, PIPE
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False = 0
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True = 1
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LOGFILE = "/home/andreas/public_html/messages/andreas"
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PICKFILE = "/var/tmp/hbd.pick"
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AEMAIL = ["andreas@wrede.ca"]
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NAME = "heatbeat"
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SMTPSERVER = "localhost"
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hosts = {}
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htab = {}
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msgs = []
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num = 0
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upcount = 0
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PORT = 50003
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TPORT = 50004
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THOST = ""
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DEBUG = False
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verbose = False
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INTERVAL = 10
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GRACE = 2
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visual = 0
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os.environ['TZ'] = 'EST5EDT'
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stdscr = None
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win = None
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msgw = None
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msgwB = None
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msgwHeight = 10
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def handler(signum, frame):
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global up, sig
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if up == 0:
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return
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sig = signum
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if verbose:
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print "signal: %s up: %d" % (sig, up)
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up = 0
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# sys.exit(0)
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def shortname(name):
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r = string.split(name, '.')
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return r[0]
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class NullDevice:
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def write(self, s):
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pass
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class Host:
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up = "up"
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down = "down"
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overdue = "overdue"
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def __init__(self, name, addr):
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global num
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self.name = shortname(name)
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self.addr = addr
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self.num = num
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self.lastbeat = time.time()
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self.upcount = 0
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self.state = Host.up
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self.state = "up"
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self.statetime = self.lastbeat
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self.interval = 0
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self.doesack = -1
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self.cmds = []
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num += 1
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def getstate(self):
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return self.state
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def dispstate(self):
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if self.state in ["down", "overdue"]:
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state = "<b>%s</b>" % self.state
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else:
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state = "%s" % self.state
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if self.doesack != -1:
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return "%s(%s)" % (state, self.doesack)
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return state
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# set new state, return number of secs in previous state
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def newstate(self, state, when=0):
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self.state = state
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now = time.time()-when
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s = now-self.statetime
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self.statetime = now
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if visual:
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displaystatetime(self.name)
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return s
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def email(s, msg):
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ret = "OK"
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toaddrs = AEMAIL
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fromaddr = "aew.heartbeat@wrede.ca"
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subj = "Info from %s: %s" % (NAME, s)
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date = time.strftime("%a, %d %b %Y %H:%M:%S %z", time.localtime())
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body = "To: %s\nFrom: %s\nSubject: %s\nDate: %s\n\n%s" % (toaddrs[0], fromaddr, subj, date, msg)
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try:
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server = smtplib.SMTP(SMTPSERVER)
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if DEBUG:
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server.set_debuglevel(1)
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server.sendmail(fromaddr, toaddrs, body)
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except smtplib.SMTPRecipientsRefused, errs:
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log("cannot send email: %s\n" % (errs))
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ret = "Fail"
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except:
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print("smtp error: "+traceback.format_exc())
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saveandrestart()
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try:
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server.quit()
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except:
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pass
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return ret
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#
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# nsupdate: set the DNS A record for a fqdn
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# return: None if ok, else error text
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def nsupdate(hostname, newip):
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D = {}
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D['domain'] = 'dy.wapanafa.org'
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D['fqdn'] = '%s.dy.wapanafa.org' % hostname
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D['dnsttl'] = '5'
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D['newip'] = newip
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D['ts'] = time.strftime('%Y-%m-%d.%H:%M:%S', time.gmtime())
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nsup = """update delete %(fqdn)s A
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update add %(fqdn)s %(dnsttl)s A %(newip)s
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update delete %(fqdn)s TXT
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update add %(fqdn)s %(dnsttl)s TXT "Created: %(ts)s"
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send
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answer
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""" % D
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# log("DBG: nsup %s" % nsup)
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cmd = ["/usr/bin/nsupdate", "-k", "/etc/dhcpc/K%(domain)s.+157+00000." % D, "-v"]
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# log("DBG: cmd %s" % cmd)
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try:
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p = Popen(cmd, shell=False, bufsize=1, stdin=PIPE, stdout=PIPE, stderr=STDOUT)
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except OSError, e:
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return "nsupdate: execution failed: %s" % e
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except:
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return "nsupdate: some error occured"
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(output, err) = p.communicate(nsup)
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if output.find('status: NOERROR') >= 0:
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return None
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return output
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#
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#
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def dur(sec):
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sec = int(sec)
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h = sec / 3600
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m = (sec - h * 3600) / 60
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s = (sec - h * 3600) % 60
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if h > 0:
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return "%d:%02d:%02d" % (h, m, s)
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if m > 0:
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return "%d:%02d" % (m, s)
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return "0:%02d" % s
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#
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#
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def addhost(name, addr):
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sname = shortname(name)
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if sname in hosts: # was: hosts.has_key(sname):
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del htab[hosts[sname].addr]
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hosts[sname].addr = addr
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if visual:
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displayaddr(sname)
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htab[addr] = sname
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m = "%s, changed address to %s" % (sname, addr)
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log(m)
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else:
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hosts[sname] = Host(sname, addr)
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s = hosts.keys()
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s.sort()
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x = 0
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for n in s:
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hosts[n].num = x
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x += 1
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htab[addr] = sname
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if visual:
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display()
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#
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def on_exit():
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if visual:
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exitcurses()
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logf.close()
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print "exit"
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def initlog(logfile):
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return open(logfile, "a")
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#
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#
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def initwin():
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global win, msgw, msgwB, msgwHeight
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maxY, maxX = stdscr.getmaxyx()
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begin_x = 0
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begin_y = 2
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height = len(htab)+2
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if DEBUG:
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log("initwin called with %d" % height)
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win = curses.newwin(height, maxX, begin_y, begin_x)
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a = win.border(0, 0, 0, 0, 0, 0, curses.ACS_LTEE, curses.ACS_RTEE)
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msgwB = curses.newwin(0, 0, height+1, begin_x)
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msgwB.border(0, 0, 0, 0, curses.ACS_LTEE, curses.ACS_RTEE)
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msgwHeight = maxY-height-3
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msgw = curses.newwin(msgwHeight, maxX-2, height+2, begin_x+1)
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msgw.setscrreg(0, msgwHeight-1)
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msgw.scrollok(1)
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stdscr.addstr(0, 0, "hbd Version %s" % VER, curses.A_BOLD)
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stdscr.refresh()
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msgwB.refresh()
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#
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def checkoverdue():
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for h in hosts.keys():
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if hosts[h].state == Host.down:
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continue
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timeout = hosts[h].interval+grace
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if hosts[h].state == Host.up and now-hosts[h].lastbeat > timeout:
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m = "%s is overdue" % h
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if h in watchhosts:
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email("overdue", m)
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hosts[h].newstate(Host.overdue, grace)
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log(m)
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#
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#
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def displaytime():
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maxY, maxX = stdscr.getmaxyx()
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stdscr.addstr(0, maxX-8, time.strftime("%H:%M:%S", time.localtime(now)), curses.A_BOLD)
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for h in hosts.keys():
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d = hosts[h].getstate()
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attr = 0
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if verbose and hosts[h].state != Host.down:
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d = dur(now-hosts[h].lastbeat)
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if hosts[h].state == Host.overdue:
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attr = curses.A_BOLD
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win.addstr(hosts[h].num+1, 25, "%8s" % d, attr)
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win.refresh()
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stdscr.refresh()
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#
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#
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def displaystatetime(h, refresh=1):
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win.addstr(hosts[h].num+1, 60, "%-17s" % time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(hosts[h].statetime)))
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if refresh:
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win.refresh()
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#
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#
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def displayaddr(h, refresh=1):
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win.addstr(hosts[h].num+1, 35, "%-16s" % hosts[h].addr)
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if refresh:
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win.refresh()
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#
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#
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def displaybody():
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for h in hosts.keys():
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win.addstr(hosts[h].num+1, 1, "%-25s" % (h))
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if hosts[h].addr is not None:
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displayaddr(h, 0)
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if hosts[h].statetime is not None:
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displaystatetime(h, 0)
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win.refresh()
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#
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#
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def displaymsgs():
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global msgw, msgs
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y = 0
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for m in msgs[len(msgs)-msgwHeight:]:
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msgw.addstr(y, 0, m)
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y += 1
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msgw.refresh()
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#
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#
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def display():
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if visual:
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initwin()
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displaytime()
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displaybody()
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displaymsgs()
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def log(m, service="heartbeat"):
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msg = time.strftime("%b %d %H:%M:%S", time.localtime(time.time()))+": "+m+"\n"
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msgs.append(msg)
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if logfmt == "msg":
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m2 = "%d|%s|%s\n" % (now, service, m)
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else:
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m2 = msg
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logf.write(m2)
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logf.flush()
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if msgw is not None:
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y, x = msgw.getyx()
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# if y > = msgwHeight-1:
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# msgw.scroll()
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msgw.addstr(msg)
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msgw.clrtoeol()
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msgw.refresh()
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pickleit()
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#
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#
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def fromaddr(name, addr, boot, interval, acks):
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global htab
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if not name in hosts: # was: hosts.has_key(name):
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addhost(name, addr)
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host = hosts[name]
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host.doesack = acks
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if host.addr != addr:
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if host.addr in htab: # was: htab.has_key(host.addr):
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del htab[host.addr]
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host.addr = addr
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htab[addr] = name
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m = "%s changed address to %s" % (host.name, addr)
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if name in dyndnshosts:
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err = nsupdate(name, addr)
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if err:
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m += ", DNS failed: %s" % err
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else:
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m += ", DNS updated."
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log(m)
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if name in watchhosts:
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email("address change", m)
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host.lastbeat = now
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if host.getstate() != Host.up and interval > 0:
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lasts = host.state
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d = host.newstate(Host.up)
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m = "%s, back after being %s for %s" % (host.name, lasts, dur(d))
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log(m)
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if name in watchhosts:
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email("back", name)
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host.upcount += 1
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#
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#
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def readsock():
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global htab, win
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data, addr = sock.recvfrom(1024)
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pairs = string.split(data, ';')
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boot = 0
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shutdown = 0
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name = "unknown"
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service = "unknown"
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msg = None
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interval = 0
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deltaT = 0.0
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acks = -1
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for pair in pairs:
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l = string.split(pair, "=")
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key = l[0]
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if len(l) != 2:
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val = "0"
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else:
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val = l[1]
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if key == 'boot':
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boot += 1
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elif key == 'shutdown':
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shutdown += 1
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elif key == 'interval':
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interval = int(val)
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elif key == 'name':
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name = shortname(val)
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elif key == 'msg':
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msg = val
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elif key == 'service':
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service = val
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elif key == 'time':
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try:
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deltaT = now-float(val)
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except:
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pass
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elif key == 'acks':
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try:
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acks = int(val)
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except:
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acks = -1
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if boot:
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if acks == -1:
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a = "(%s)" % acks
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else:
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a = ""
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m = "%s booted, deltaT %0.2g sec %s" % (name, deltaT, a)
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log(m)
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if name in watchhosts:
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email("booted", m)
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if msg:
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m = "%s msg: %s" % (name, msg)
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log(m, service=service)
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if name in watchhosts:
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email("msg", m)
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fromaddr(name, addr[0], boot, interval, acks)
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if shutdown:
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m = "%s shutdown" % name
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log(m)
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if name in watchhosts:
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email("shutdown", m)
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try:
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hosts[name].newstate(Host.down)
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except:
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pass
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if interval > 0:
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try:
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hosts[name].interval = interval
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except:
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pass
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rmsg="ACK"
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if len(hosts[name].cmds):
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rmsg=hosts[name].cmds[0]
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email("%s cmd exec" % name, "command '%s' initiated" % hosts[name].cmds[0])
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del hosts[name].cmds[0]
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log("%s command initiated" % name)
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try:
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sock.sendto(rmsg, addr)
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except:
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pass
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#
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#
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#
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def initcurses():
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global stdscr
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stdscr = curses.initscr()
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curses.noecho()
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curses.cbreak()
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stdscr.keypad(1)
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if DEBUG:
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sys.stderr.write("curses init done: %s\n" % stdscr)
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def exitcurses():
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curses.nocbreak()
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stdscr.keypad(0)
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curses.echo()
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curses.endwin()
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#
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#
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class HtmlHandler(SocketServer.BaseRequestHandler):
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allow_reuse_address = True
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def buildhead(self, title="Heartbeat", refresh=None):
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res=[]
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res.append('<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">')
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res.append("<html>")
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res.append("<head>")
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res.append('<title>%s</title>' % (title))
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if refresh:
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res.append("<meta http-equiv = Refresh content = %d>\n" % refresh)
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res.append("</head>")
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res.append('<body BGCOLOR = "#FFFFFF" LINK = "#008000" VLINK = "#008000" BACKGROUND = "/~andreas/images/tile.marble.gif">')
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return res
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def buildpage(self):
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res=self.buildhead(refresh=60)
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res.append("<H2>Heartbeat status</h2><h4> %s (%s)</H4>" % (time.strftime("%H:%M:%S", time.localtime(now)), os.environ.get('TZ', 'CET-1CDT')))
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res.append("<table>")
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res.append("<tr><th>Host</th><th>State</th><th>IP Addr</th><th>Last change</th></tr>\n")
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hosts_sorted = hosts.keys()
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hosts_sorted.sort()
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for h in hosts_sorted:
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res.append("<tr><td>%-24s</td><td>%-7s</td><td>%-16s</td><td>%-17s</td></tr>\n" % (h, hosts[h].dispstate(), hosts[h].addr, time.strftime("%Y-%m-%d %H:%M:%S", time.localtime(hosts[h].statetime))))
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res.append("</table>")
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res.append("<h4>Log of Events</h4>")
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for m in msgs[len(msgs)-30:]:
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res.append("%s<BR>" % m)
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res.append("</body></html>")
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return res
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def handle(self):
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headers=[]
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headers.append("Date: %s" % time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(now)))
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headers.append("Server: hbd")
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headers.append("Last-Modified: %s" % time.strftime("%a, %d %b %Y %H:%M:%S GMT", time.gmtime(now)))
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headers.append("Accept-Ranges: bytes")
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headers.append("Connection: close")
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headers.append("Content-Type: text/html; charset = ISO-8859-1")
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uri = '/unknown'
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f = self.request.makefile()
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while 1:
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line = string.strip(f.readline())
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if len(line) == 0:
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break
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r = line.split()
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if r[0] == "GET":
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uri = r[1]
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html = r[2]
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upar=string.split(uri,"?")
|
|
if len(upar) == 1:
|
|
uarg=[]
|
|
else:
|
|
uarg=string.split(upar[1],"&")
|
|
|
|
code = 200
|
|
cause = "OK"
|
|
if uri == "/":
|
|
res=self.buildpage()
|
|
|
|
elif upar[0] == "/c": # command on host /c?h=melschserver&c=sudo%20ls
|
|
uname=""
|
|
ucmd=""
|
|
if uarg[0][:2] == "h=":
|
|
uname=uarg[0][2:]
|
|
if uarg[1][:2] == "c=":
|
|
ucmd=uarg[1][2:]
|
|
if ucmd != "" and uname != "" and hosts.has_key(uname):
|
|
hosts[uname].cmds.append(urllib.unquote(ucmd))
|
|
res=self.buildhead()
|
|
res.append("2Done")
|
|
|
|
elif upar[0] == "/d": # drop host /d?h=melschserver
|
|
if uarg[0][:2] == "h=":
|
|
uname=uarg[0][2:]
|
|
if uname != "" and hosts.has_key(uname):
|
|
del hosts[uname]
|
|
log("%s dropped" % uname)
|
|
res=self.buildhead()
|
|
res.append("Done")
|
|
|
|
else:
|
|
code = 404
|
|
cause = "Not Found"
|
|
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>The requested URL %s was not found on this server.</p>' % uri)
|
|
res.append('<hr>')
|
|
res.append('<address>hbd (Unix) Server at %s Port %s</address>' % (hbd_host, hbd_port))
|
|
res.append('</body></html>')
|
|
|
|
self.request.send("HTTP/1.0 %s %s\r\n" % (code, cause))
|
|
for h in headers:
|
|
self.request.send("%s\r\n" % h)
|
|
self.request.send("\r\n")
|
|
|
|
try:
|
|
self.request.send(string.join(res, "\n"))
|
|
except:
|
|
pass
|
|
|
|
|
|
def saveandrestart():
|
|
sock.close()
|
|
serv.shutdown()
|
|
serv.server_close()
|
|
log("restarting")
|
|
os.execv(sys.argv[0], [sys.argv[0]]+cmdargs)
|
|
|
|
|
|
def pickleit():
|
|
pickf = open(PICKFILE, 'w')
|
|
pick = cPickle.Pickler(pickf)
|
|
pick.dump(hosts)
|
|
pick.dump(htab)
|
|
pick.dump(msgs)
|
|
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:v')
|
|
except:
|
|
helpflag = True
|
|
|
|
for o, a in optlist:
|
|
if o == '-c':
|
|
configfile = a
|
|
cmdargs += [o, a]
|
|
if o == '-d':
|
|
visual = True
|
|
cmdargs += [o]
|
|
elif o == '-f':
|
|
forground = True
|
|
cmdargs += [o]
|
|
elif o == '-h':
|
|
helpflag = True
|
|
elif o == '-v':
|
|
verbose = True
|
|
cmdargs += [o]
|
|
|
|
|
|
if helpflag:
|
|
print "hbc HeartBeatDaemon"
|
|
print "usage: hbd [-dfhv] [-c configfile]"
|
|
print
|
|
print " -c configfile"
|
|
print " -d display"
|
|
print " -f run in foreground"
|
|
print " -h this help"
|
|
print " -v verbose"
|
|
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)
|
|
|
|
if visual:
|
|
forground = True
|
|
#
|
|
# set defaults
|
|
|
|
hb_port = PORT
|
|
hbd_host = THOST
|
|
hbd_port = TPORT
|
|
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 conifig file: %s" % configfile
|
|
f = None
|
|
|
|
if f:
|
|
while 1:
|
|
l = f.readline()
|
|
if len(l) == 0:
|
|
break
|
|
if verbose:
|
|
print " %s" % l[:-1]
|
|
r = l[:-1].split('=')
|
|
if r[0] == 'interval':
|
|
interval = eval(r[1])
|
|
elif r[0] == 'grace':
|
|
grace = eval(r[1])
|
|
elif r[0] == 'hbd_port':
|
|
hbd_port = eval(r[1])
|
|
elif r[0] == 'hbd_host':
|
|
hbd_host = r[1]
|
|
elif r[0] == 'hb_port':
|
|
hb_port = eval(r[1])
|
|
elif r[0] == 'logfile':
|
|
logfile = r[1]
|
|
elif r[0] == 'logfmt':
|
|
logfmt = r[1]
|
|
elif r[0] == 'watchhosts':
|
|
watchhosts = eval(r[1])
|
|
elif r[0] == 'dyndnshosts':
|
|
dyndnshosts = eval(r[1])
|
|
elif r[0] == 'drophosts':
|
|
drophosts = eval(r[1])
|
|
f.close()
|
|
|
|
if len(args) != 0:
|
|
print "error: args"
|
|
sys.exit(1)
|
|
|
|
|
|
if verbose:
|
|
print "notice: logging to %s" % logfile
|
|
logf = initlog(logfile)
|
|
|
|
if os.path.exists(PICKFILE):
|
|
pickf = open(PICKFILE, 'r')
|
|
pick = cPickle.Unpickler(pickf)
|
|
try:
|
|
hosts = pick.load()
|
|
htab = pick.load()
|
|
msgs = pick.load()
|
|
pickf.close()
|
|
except:
|
|
os.unlink(PICKFILE)
|
|
for h in drophosts:
|
|
if h in hosts: # was: hosts.has_key(h):
|
|
del hosts[h]
|
|
|
|
|
|
now = time.time()
|
|
startsec = int(now) % interval
|
|
|
|
if visual:
|
|
import curses
|
|
initcurses()
|
|
display()
|
|
stdscr.nodelay(1)
|
|
|
|
log("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)
|
|
|
|
serv = SocketServer.TCPServer((hbd_host, hbd_port), HtmlHandler)
|
|
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()
|
|
sys.stdout = NullDevice()
|
|
sys.stderr = NullDevice()
|
|
os.chdir("/")
|
|
os.setsid()
|
|
os.umask(0)
|
|
|
|
up = 1
|
|
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 = next - now
|
|
while up:
|
|
if visual:
|
|
c = stdscr.getch()
|
|
if c == ord('c'):
|
|
msgs = []
|
|
display()
|
|
elif c == ord('q'):
|
|
break # Exit the while()
|
|
elif c == ord('d'):
|
|
DEBUG = not DEBUG
|
|
elif c == ord('v'):
|
|
verbose = not verbose
|
|
# elif c == ord('p'):
|
|
# PrintDocument()
|
|
# elif c == ord('x'):
|
|
# x = y = 0
|
|
|
|
try:
|
|
sr = select.select(ilist, [], [], sleep)
|
|
now = time.time()
|
|
except KeyboardInterrupt:
|
|
sys.exit(0)
|
|
except select.error, value:
|
|
if value[0] != 4: # interrupted system call
|
|
print select.error, value
|
|
#raise os.error, value
|
|
continue
|
|
if visual:
|
|
exitcurses()
|
|
initcurses()
|
|
display()
|
|
continue
|
|
for fh in sr[0]:
|
|
if fh == sock:
|
|
readsock()
|
|
if fh == serv.fileno():
|
|
serv.handle_request()
|
|
if now >= next:
|
|
next = now+1
|
|
checkoverdue()
|
|
if visual:
|
|
stdscr.move(1, 0)
|
|
stdscr.clrtoeol()
|
|
displaytime()
|
|
|
|
sleep = next-now
|
|
if sleep < 0:
|
|
sys.stderr.write("sleep is negaitive! %s next = %s\n" % (sleep, next))
|
|
sleep = 0
|
|
if DEBUG:
|
|
sys.stderr.write("sleep = %s next = %s\n" % (sleep, next))
|
|
|
|
|
|
if sig == signal.SIGHUP:
|
|
saveandrestart()
|