#! /usr/bin/python2.0

# DNSflow 0.1
# a automatic update client for the
# dtDNS-Service available from www.dtdns.com
# coded end of 2K02 by flowtron@gmx.de

# examples :
# dnsflow test.dtdns.net opensesame 1.2.3.4
# dnsflow another.name.darktech.org password 101.242.7.42
# dnsflow worm.slyip.org 1!like:it 101.242.42.666
# if your system is anything like mine you can even try omitting the IP,
# the script will try to obtain it from the system.
# check the lines between following delimiter for system specific information and adapt if needed.
# ------------------------------------------------------------------------------------------------

from string import find
from sys import argv
from httplib import HTTPSConnection,ResponseNotReady
from urllib import urlencode
from commands import getoutput
from re import compile
from traceback import print_exc

IP="0.0.0.0"
PASS="unknown"
HOST="unknown"

if len(argv)>0:
	if len(argv)>4:print "ignoring excessive parameters"
	if len(argv)==4:
		HOST=argv[1]
		PASS=argv[2]
		pattern=compile("(\d{1,3}.){3,3}\d{1,3}") # xxx.xxx.xxx.xxx - IP4 only!
		# if you need IP6 it shouldn't be a prob' to implement.
		match=pattern.match(argv[3])
		if not match:
			print "IP information seems corrupt (just IP4 if you don't mind)."
			HOST="unknown" # for safety reasons no corrupt data will be sent
		else: #strip pure IP from last argument passed
			span=match.span()
			IP=argv[3][span[0]:span[1]]
	elif len(argv)==3:
		err=1 # default
		HOST=argv[1]
		PASS=argv[2]
# ------------------------------------------------------------------------------------------------
		IP=getoutput('/sbin/ifconfig | grep -A 1 "ippp0" | grep "inet"')
		first_colon=find(IP,":")
		if first_colon!=-1:
			second_colon=find(IP,":",first_colon+1)
			if second_colon!=-1:
				IP=IP[first_colon+1:second_colon]
				first_space=find(IP," ")
				if first_space!=-1:
					IP=IP[:first_space]
					err=0
# ------------------------------------------------------------------------------------------------
		if err==1:
			print "error determining IP"
		else:
			print "updating to >"+str(IP)+"< ..."
	else:
		print "usage: dnsflow HOSTNAME PASSWORD (IP)"
if HOST!="unknown":
	params = urlencode({"id" : HOST, "pw" : PASS, "ip" : IP, "client" : "DNSflow 0.1"})
	try:
		conn = HTTPSConnection ("www.dtdns.com")
		conn.putrequest('POST','/api/autodns.cfm?'+params)
		conn.endheaders()
		response=conn.getresponse()
		print "dtDNS:"+response.read()
		conn.close()
	except ResponseNotReady:
		print "Problems while connecting to dtDNS!"
	except error,errordata:
		print "Network problems. ["+str(errordata)+"]"
		print "Please be sure you are connected to the internet/network."
	except:# for things like socket.error which I couldn't catch "the usual way"...
		print "Unexpected error!\nPython traceback:\n"
		print_exc()
else:
	print "pass them on the command-line."
	print "\nomitting IP will force the script to try to determine it automatically."
	print "(note: for this feature the script might need (source) adjustment to fit your system!)"