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enableDns-updater
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enableDns-updater
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#!/usr/bin/env python
import syslog
def logger(msg):
if results.daemonize:
# we are running as a daemon. Log to syslog
syslog.openlog('EnableDNS', syslog.LOG_USER)
syslog.syslog(str(msg))
syslog.closelog()
else:
print msg
return 0
try:
import requests
except:
logger("This application requires python-requests in order to run. You may install this library on most systems by using easy_install:\n")
logger("easy_install requests")
sys.exit(1)
try:
from configobj import ConfigObj
except:
logger("This application requires python-configobj in order to run. You may install this library on most systems by using easy_install:\n")
logger("easy_install configobj")
sys.exit(1)
try:
import argparse
except:
logger("This application requires argparse in order to run. You may install this library on most systems by using easy_install:\n")
logger("easy_install argparse")
sys.exit(1)
import json
import os
import sys
import pwd
import getpass
import signal
import time
import resource
def logger(msg):
if results.daemonize:
# we are running as a daemon. Log to syslog
syslog.syslog(syslog.LOG_NOTICE, str(msg))
else:
print msg
return 0
def createDaemon():
UMASK = 0
WORKDIR = "/"
MAXFD = 1024
if (hasattr(os, "devnull")):
REDIRECT_TO = os.devnull
else:
REDIRECT_TO = "/dev/null"
try:
pid = os.fork()
except OSError, e:
raise Exception, "%s [%d]" % (e.strerror, e.errno)
if (pid == 0): # The first child.
os.setsid()
signal.signal(signal.SIGHUP, signal.SIG_IGN)
try:
pid = os.fork()
except OSError, e:
raise Exception, "%s [%d]" % (e.strerror, e.errno)
if (pid == 0):
os.chdir(WORKDIR)
os.umask(UMASK)
else:
os._exit(0)
else:
os._exit(0)
maxfd = resource.getrlimit(resource.RLIMIT_NOFILE)[1]
if (maxfd == resource.RLIM_INFINITY):
maxfd = MAXFD
# Iterate through and close all file descriptors.
for fd in range(0, maxfd):
try:
os.close(fd)
except OSError: # ERROR, fd wasn't open to begin with (ignored)
pass
os.open(REDIRECT_TO, os.O_RDWR) # standard input (0)
# Duplicate standard input to standard output and standard error.
os.dup2(0, 1) # standard output (1)
os.dup2(0, 2) # standard error (2)
return(0)
def sigint_handler(signum, frame):
logger('Exiting...')
sys.exit(0)
signal.signal(signal.SIGINT, sigint_handler)
parser = argparse.ArgumentParser(version='1.0', add_help=True)
parser.add_argument('--reset-login', '-rl', action="store_true", default=False, help="Use this option to reset your login information")
parser.add_argument('--reset-domain', '-rd', action="store_true", default=False, help='Use this option to reset domain name and subdomain preferences')
parser.add_argument('--force-update', '-f', action="store_true", default=False, help='Force update. Use this option ONLY if you suspect that a previous update failed and was cached localy as successful.')
parser.add_argument('--daemonize', '-d', action="store_true", default=False, help="Run the updater as a daemon process")
class ConfigEdit():
def __init__(self):
self.usr_data = UserData()
self.config = self.usr_data.config
def edit_domain_info(self):
if self.config.get('domain', False) is False:
self.config['domain'] = {}
self.config['domain']['name'] = raw_input('Domain name (eg: example.com): ')
self.config['domain']['subdomain'] = raw_input('Subdomain (eg: www): ')
if len(self.config['domain']['name']) == 0:
logger("You must specify a domain name!")
sys.exit(1)
self.config.write()
return True
def edit_user_info(self):
self.config['user']['username'] = raw_input('EnableDNS username: ')
self.config['user']['password'] = getpass.getpass('EnableDNS password: ')
if len(self.config['user']['username']) == 0 or len(self.config['user']['password']) == 0:
logger("Username and password are mandatory!")
sys.exit(1)
self.config.write()
return True
def delete_cache(self):
if self.config.get('cache', False) != False:
del self.config['cache']
self.config.write()
return True
class UserData():
def __init__(self):
try:
self.uid = os.getuid()
self.usr = pwd.getpwuid(self.uid)
self.home = self.usr.pw_dir
except Exception as err:
logger("Failed to get user information (%s)" % str(err))
sys.exit(1)
if os.path.isdir(self.home + '/.config'):
base = self.home + '/.config/'
else:
base = self.homei + '/.'
self.url = 'https://enabledns.com/api/domains'
self.cfg_dir = base + 'enabledns'
self.cfg_file = self.cfg_dir + '/config.ini'
self.config = self.get_config()
def get_config(self):
if os.path.isfile(self.cfg_file) is False:
self.first_run()
try:
tmp = ConfigObj(self.cfg_file)
except Exception as err:
logger("There was an error opening the config file (%s)" % str(err))
sys.exit(1)
return tmp
def first_run(self):
logger("It seams you are running this application for the verry first time. Please take a moment to fill out your login information to EnableDNS and to tell us which subdomain you wish to update.\nYou will be asked to fill in you username, password, a domain name you already configured on enabledns.com, and a subdomain.\n\nPlease note that if you do not specify a subdomain, this application wil update the domain name itself.\n\n")
if os.path.isdir(self.cfg_dir) is False:
try:
os.makedirs(self.cfg_dir, 00750)
except Exception as err:
logger("Failed to create config directory %s. Error was: %s" % (str(self.cfg_dir), str(err)))
sys.exit(1)
cfg = ConfigObj()
cfg.filename = self.cfg_file
cfg['user'] = {}
cfg['domain'] = {}
cfg['user']['username'] = raw_input('EnableDNS username: ')
cfg['user']['password'] = getpass.getpass('EnableDNS password: ')
cfg['domain']['name'] = raw_input('Domain name (eg: example.com): ')
cfg['domain']['subdomain'] = raw_input('Subdomain (eg: www): ')
if len(cfg['user']['username']) == 0 or len(cfg['user']['password']) == 0 or len(cfg['domain']['name']) == 0:
logger("Username, pasword and domain name are mandatory. Please rerun this script and input the required informtion.")
sys.exit(1)
if len(cfg['domain']['subdomain']) == 0:
cfg['domain']['subdomain'] = None
self.config = cfg
cfg.write()
logger("Your account has been set up. If you wish to make changes to the info you just subimted, please consult the help menu.")
return cfg
def get_my_ip(self):
ip = None
ip = requests.get('https://enabledns.com/ip')
if str(ip.status_code) != '200':
logger("Failed to fetch your current IP address. Please check your internet connection.")
return ip.content
def treat_http_codes(self, code):
if str(code) == '404':
logger("Could not find any information about %s . Is this domain configured in your EnableDNS account?" % str(self.config['domain']['name']))
sys.exit(1)
if str(code) == '401':
logger("Incorect username or password")
sys.exit(1)
if str(code) == '500':
logger("There was a server error. Please try again later")
sys.exit(1)
if str(code) != '200':
logger("There was an error retrieving the domain name information for %s --> %s" % (str(self.config['domain']['name']), str(code)))
return True
def create_entry(self, ent, ip):
rec_data = {'host': str(ent), 'ttl': 600, 'type': 'A', 'data': str(ip)}
x = self.url + '/' + self.config['domain']['name'] + '.json'
hdr = {'Content-type': 'application/json'}
data = requests.post(x, auth=(self.config['user']['username'], self.config['user']['password']), headers=hdr, data=json.dumps(rec_data))
self.treat_http_codes(data.status_code)
return True
def get_record_info(self, ip=None):
if self.config.get('cache', False) != False:
if self.config['cache'].get('rec_id', False) != False:
return {'id': self.config['cache']['rec_id']}
x = self.url + '/' + self.config['domain']['name'] + '.json'
data = requests.get(x, auth=(self.config['user']['username'], self.config['user']['password']))
self.treat_http_codes(data.status_code)
try:
rec = json.loads(data.content)
except:
logger("Got invalid data from server. Please try again later.")
sys.exit(1)
if self.config['domain']['subdomain'] is None:
rec_name = u'@'
else:
rec_name = self.config['domain']['subdomain']
tmp = None
for i in rec:
if str(i['type']) == 'A' and str(i['host']) == str(rec_name):
tmp = i
if tmp is None:
self.create_entry(rec_name, ip)
sys.exit(1)
else:
self.config['cache']['rec_id'] = tmp['id']
self.config.write()
return {'id': tmp['id']}
def update_ip(self, ip):
rec_info = self.get_record_info(ip=ip)
rec_info['data'] = str(ip)
x = self.url + '/' + self.config['domain']['name'] + '.json'
hdr = {'Content-type': 'application/json'}
tmp = requests.put(x, auth=(self.config['user']['username'], self.config['user']['password']), data=json.dumps(rec_info), headers=hdr)
self.treat_http_codes(tmp.status_code)
return True
def run(self):
if 'cache' not in self.config:
self.config['cache'] = {}
ip = None
ip = self.get_my_ip()
if self.config['cache'].get('ip', False) is False:
self.config['cache']['ip'] = ip
self.update_ip(ip)
self.config.write()
if str(ip) != str(self.config['cache']['ip']):
logger("IP address has changed. Updating...")
self.update_ip(ip)
self.config['cache']['ip'] = ip
self.config.write()
logger("Successfuly updated IP. New ip is %s" % str(ip))
sys.exit(0)
return True
def reap_kids(pid):
if pid is False:
return None
elif pid != None:
p, e = os.waitpid(pid, os.WNOHANG)
if p != 0:
return None
return pid
def run(loop=False):
if loop is True:
createDaemon()
proc_pid = None
while 1:
if proc_pid is None:
p = os.fork()
if p == 0:
logger("forking...")
a = UserData()
a.run()
sys.exit(0)
elif p > 0:
proc_pid = p
else:
logger("Failed to fork")
sys.exit(1)
time.sleep(20)
proc_pid = reap_kids(proc_pid)
time.sleep(280)
else:
a = UserData()
a.run()
return True
if __name__ == "__main__":
results = parser.parse_args()
actions = ConfigEdit()
if results.reset_domain is True:
actions.edit_domain_info()
if results.reset_login is True:
actions.edit_user_info()
if results.force_update is True:
actions.delete_cache()
run(loop=results.daemonize)