ieServerのDDNS更新スクリプト(Python版)

いつもお世話になっているieServerでDDNSを更新するためのスクリプトをPythonで書いた。
しかし、perlとwgetを使うものが用意されているので、Pythonのものをわざわざ使う意味はあまりない。
http://ieserver.net/ddns-update.txt
自己満足ということで。

#!/usr/bin/python
import os
import urllib2
import datetime

IP_IGNORE = '0.0.0.0'

CURRENT_IP_FILE = 'current_ip'
LOG_FILE = 'update.log'
REMOTE_ADDR_CHK = 'http://ieserver.net/ipcheck.shtml'
DDNS_UPDATE = 'https://ieserver.net/cgi-bin/dip.cgi'

ACCOUNT = ''
DOMAIN = ''
PASSWORD = ''

def main():
    if os.path.exists(CURRENT_IP_FILE):
        f = open(CURRENT_IP_FILE, 'r')
        current_ip = f.read()
        f.close()
    else:
        current_ip = IP_IGNORE
    
    print 'Current IP: %s' % current_ip
    
    try:
        port = urllib2.urlopen(REMOTE_ADDR_CHK)
        new_ip = port.read()
        port.close()
    except:
        new_ip = IP_IGNORE
    
    print 'New IP: %s' % new_ip

    if (new_ip != IP_IGNORE) and (current_ip != new_ip):
        try:
            port = urllib2.urlopen(DDNS_UPDATE + '?username=%s&domain=%s&password=%s&updatehost=1' % (ACCOUNT, DOMAIN, PASSWORD))
            status = port.read()
            port.close()
            import re
            r = re.compile(new_ip)
            if r.search(status):
                updated = True
            else:
                updated = False
        except:
            updated = False
        logfile = open(LOG_FILE, 'a')
        if updated:
            logfile.write('%s %s.%s Update %s to %s\n' % (datetime.datetime.now(), ACCOUNT, DOMAIN, current_ip, new_ip))
            ipfile = open(CURRENT_IP_FILE, 'w')
            ipfile.write(new_ip)
            ipfile.close()
        else:
            logfile.write('%s %s.%s Update aborted %s to %s\n' % (datetime.datetime.now(), ACCOUNT, DOMAIN, current_ip, new_ip))
        logfile.close()

if __name__ == '__main__':
    main()