RaspberryPi IP address emailer

check_ip.py

#!/usr/bin/python
# The idea behind this script is if plugging a RaspberryPi into a foreign network whilst running it headless
# (i.e. without a monitor/TV), you need to know what the IP address is to SSH into it.
#
# This script emails you the IP address if it detects an ethernet address other than it's usual address
# that it normally has, i.e. on your home network.  


import subprocess
import smtplib
import string
import time

FIXED_IP = '10.10.2.10'

#  Will change this to use tempfile module to avoid permissions issues once I am back on a Pi/linux machine
ipaddr_string = 'ip -4 addr > ~/current_ip.txt'
subprocess.call(ipaddr_string, shell=True)

ip_file = file('~/current_ip.txt', 'r')
for line in ip_file:
    if 'eth0:' in line:
	_time = time.asctime()
        _mac = file('/sys/class/net/eth0/address').read()  # Don't know what you'll use it for atm, but I've included it
	inet_line = ip_file.next()
	inet_string = inet_line[9:(inet_line.index('/'))]
	
	if inet_string != FIXED_IP:
		
            print 'Found eth0: %s' % inet_string

	    SUBJECT = 'IP Address from Raspberry Pi at: %s' % time.asctime()
	    TO = 'recipient@email.com'
	    FROM = 'sender@gmail.com'
	    text = 'The IP address is: %s and the mac address is %s' % (inet_string, _mac)
	    BODY = string.join((
	    			'From: %s' % FROM,
				'To: %s' % TO,
				'Subject: %s' % SUBJECT,
				'',
				text
				), '\r\n')

	    server = smtplib.SMTP_SSL('smtp.gmail.com', 465)     # NOTE:  This is the GMAIL SSL port.
	    server.login('sender@gmail.com', 'password')
	    server.sendmail(FROM, [TO], BODY)
	    server.quit()

ip_file.close()

# enable the following 2 lines to delete the text file afterwards, i.e. to make it a bit cleaner.
#_string = 'rm -f ~/current_ip.txt'
#subprocess.call(_string, shell=True)