PyIpWatch

#! /usr/bin/python

import os
import time
import urllib2
import smtplib
from email.MIMEMultipart import MIMEMultipart
from email.MIMEBase import MIMEBase
from email.MIMEText import MIMEText
from email.Utils import COMMASPACE, formatdate
from email import Encoders
from datetime import datetime

def check_in():

    fqn = os.uname()[1]
    tries = 0
    success = False
    ext_ip = ""
    while (success == False and tries < 5):
        try:
            ext_ip = urllib2.urlopen('http://automation.whatismyip.com/n09230945.asp').read()
            success = True
        except:
            tries += 1
            logf.write("tries: %d, sleeping for 20 secs\n" % tries)
            time.sleep(20)

    return success, fqn, ext_ip

def sendMail(to, fro, subject, text, files=[],server="localhost"):
    assert type(to)==list
    assert type(files)==list


    msg = MIMEMultipart()
    msg['From'] = fro
    msg['To'] = COMMASPACE.join(to)
    msg['Date'] = formatdate(localtime=True)
    msg['Subject'] = subject

    msg.attach( MIMEText(text) )

    for file in files:
        part = MIMEBase('application', "octet-stream")
        part.set_payload( open(file,"rb").read() )
        Encoders.encode_base64(part)
        part.add_header('Content-Disposition', 'attachment; filename="%s"'
                       % os.path.basename(file))
        msg.attach(part)

    smtp = smtplib.SMTP(server)
    smtp.sendmail(fro, to, msg.as_string() )
    smtp.close()


logf = open('updateip.log', 'a')
tstamp = datetime.now()
logf.write("updateip.py starting at: %s\n" % tstamp)
success, fqn, ext_ip = check_in()

if (not success):
    logf.write("Couldn't get current ip, will try again in 20 mins...\n")
else:
    logf.write("FQN: %s\n" % fqn)
    logf.write("Ext IP: %s\n" % ext_ip)
    filedata = ""
    if (os.path.exists('ipaddr.txt')):
        f = open('ipaddr.txt', 'r')
        filedata = f.read()
        f.close()
    if (str(filedata) == ext_ip):
        logf.write("IP address matches!\n")
    else:
        logf.write("IPs don't match, updating ipaddr.txt...\n")
        f = open('ipaddr.txt', 'w')
        f.write(ext_ip)
        f.close()
        logf.write("...sending mail...\n")
        sendMail(['To <[email protected]>'],'From <[email protected]>','Hello from %s!' % fqn,'Server external IP address: %s' % ext_ip,[])
        logf.write("...all done!\n")
logf.close()