X-Git-Url: https://git.ralfj.de/dyn-nsupdate.git/blobdiff_plain/4c50ee5d8b2eb10d1fa5a1c8ec340fb769614ffd..d95148544cb5f50e5aba884fd1f957182a9b70ca:/client-scripts/dyn-ns-client diff --git a/client-scripts/dyn-ns-client b/client-scripts/dyn-ns-client index 6af3934..2a5dc21 100755 --- a/client-scripts/dyn-ns-client +++ b/client-scripts/dyn-ns-client @@ -1,39 +1,131 @@ #!/usr/bin/python3 -import urllib.request, socket, sys - +# Copyright (c) 2014, Ralf Jung +# All rights reserved. +# +# Redistribution and use in source and binary forms, with or without +# modification, are permitted provided that the following conditions are met: +# +# 1. Redistributions of source code must retain the above copyright notice, this +# list of conditions and the following disclaimer. +# 2. Redistributions in binary form must reproduce the above copyright notice, +# this list of conditions and the following disclaimer in the documentation +# and/or other materials provided with the distribution. +# +# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND +# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED +# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE +# DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR +# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES +# (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; +# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND +# ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT +# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS +# SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. +#============================================================================== # configuration variables -server = 'ns.ralfj.de' -domains = ['domain.dyn.ralfj.de'] # list of domains to update -password = 'yourpassword' +domains = ['test.dyn.example.com'] # list of domains to update +password = 'some_secure_password' +haveIPv4 = True +haveIPv6 = False + +serverIPv4 = 'ipv4.ns.example.com' # Only needed if haveIPv4 is True. This server should NOT have an AAAA record! +serverIPv6 = 'ipv6.ns.example.com' # Only needed if haveIPv6 is True. This server should NOT have an A record! +server = 'ns.example.com' # END of configuration variables +#============================================================================== + +import urllib.request, socket, sys, argparse def urlopen(url): - return urllib.request.urlopen(url).read().decode('utf-8').strip() - -myip = urlopen('https://'+server+'/checkip') - -def update_domain(domain): - '''Update the given domain, using the global server, user, password. Returns True on success, False on failure.''' - global myip - # check if the domain is already mapped to our current IP - domainip = socket.gethostbyname(domain) - if myip == domainip: - # nothing to do - return True - - # we need to update the IP - result = urlopen('https://'+server+'/update?password='+urllib.parse.quote(password)+'&domain='+urllib.parse.quote(domain)+'&ip='+urllib.parse.quote(myip)) - if 'good '+myip == result: - # all went all right - return True - else: - # Something went wrong - print("Unexpected answer from server",server,"while updating",domain,"to",myip) - print(result) - return False - -exitcode = 0 -for domain in domains: - if not update_domain(domain): - exitcode = 1 -sys.exit(exitcode) + return urllib.request.urlopen(url).read().decode('utf-8').strip() + +def getMyIP(server): + return urlopen('https://'+server+'/checkip') + +def getCurIP(domain, family): + try: + addr = socket.getaddrinfo(domain, None, family=family) + return addr[0][4][0] + except socket.gaierror: # domain not found + return "" + +def getCurIPv4(domain): + return getCurIP(domain, socket.AF_INET) + +def getCurIPv6(domain): + return getCurIP(domain, socket.AF_INET6) + +def update_domain(server, domain, ipv4, ipv6, password, verbose): + '''Update the given domain, using the server, password. ipv4 or ipv6 can be None to not update that record. Returns True on success, False on failure.''' + assert ipv4 is not None or ipv6 is not None + + # check what the domain is currently mapped to + curIPv4 = getCurIPv4(domain) + curIPv6 = getCurIPv6(domain) + if verbose: + print("Current status of domain {0} is: IPv4 address '{1}', IPv6 address '{2}'".format(domain, curIPv4, curIPv6)) + + # check if there's something to do + needUpdate = (ipv4 is not None and curIPv4 != ipv4) or (ipv6 is not None and curIPv6 != ipv6) + if not needUpdate: + if verbose: + print("Everything already up-to-date, nothing to do") + return True + + # we need to update the IP + url = 'https://'+server+'/update?password='+urllib.parse.quote(password)+'&domain='+urllib.parse.quote(domain) + expected = "good" + if ipv4 is not None: + url += '&ip='+urllib.parse.quote(ipv4) + expected += " "+ipv4 + if ipv6 is not None: + url += '&ipv6='+urllib.parse.quote(ipv6) + expected += " "+ipv6 + result = urlopen(url) + + # did everything go as planned? + if result == expected: + if verbose: + print("Successfully updated domain",domain) + # all went all right + return True + else: + # Something went wrong + print("Unexpected answer from server",server,"while updating",domain) + print(result) + return False + +if __name__ == "__main__": + # allow overwriting some values on the command-line + parser = argparse.ArgumentParser(description='Update a domain managed by a dyn-nsupdate server') + parser.add_argument("-p", "--password", + dest="password", default=password, + help="The password used to update the domains") + parser.add_argument("-v", "--verbose", + action="store_true", dest="verbose", + help="Be more verbose") + parser.add_argument("domains", metavar='DOMAIN', nargs='*', default=domains, + help="The domains to update") + args = parser.parse_args() + + # get our own IPv4 + if haveIPv4: + myIPv4 = getMyIP(serverIPv4) + if args.verbose: + print("My IPv4 is",myIPv4) + else: + myIPv4 = None + # and IPv6 + if haveIPv6: + myIPv6 = getMyIP(serverIPv6) + if args.verbose: + print("My IPv6 is",myIPv6) + else: + myIPv6 = None + + # update all the domains + exitcode = 0 + for domain in args.domains: + if not update_domain(server, domain, myIPv4, myIPv6, args.password, verbose=args.verbose): + exitcode = 1 + sys.exit(exitcode)