X-Git-Url: https://git.ralfj.de/dyn-nsupdate.git/blobdiff_plain/11b054f64b837660290e297c390aa09b0b57e8d6..556b6fb987e04d7898c5520298c4e1f07b234434:/client-scripts/dyn-ns-client diff --git a/client-scripts/dyn-ns-client b/client-scripts/dyn-ns-client index 524b4ad..e5eb56e 100755 --- a/client-scripts/dyn-ns-client +++ b/client-scripts/dyn-ns-client @@ -1,4 +1,4 @@ -#!/usr/bin/python3 +#!/usr/bin/env python3 # Copyright (c) 2014, Ralf Jung # All rights reserved. # @@ -22,27 +22,85 @@ # (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 -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 +import urllib.request, socket, sys, argparse, os, configparser, itertools, subprocess, re, ssl + +VERBOSE_CHANGE = 1 +VERBOSE_FULL = 2 + +def sslContext(config): + if config['DEFAULT'].get('ssl_check_cert', 'yes').lower() in ('0', 'false', 'no'): + context = ssl.SSLContext(ssl.PROTOCOL_SSLv23) + return context + else: + return None + +def readConfig(fname, defSection = 'DEFAULT'): + config = configparser.ConfigParser() + with open(fname) as file: + stream = itertools.chain(("["+defSection+"]\n",), file) + config.read_file(stream) + return config -def urlopen(url): - return urllib.request.urlopen(url).read().decode('utf-8').strip() +def getConfigDir(): + try: + from xdg import BaseDirectory + return os.path.join(BaseDirectory.xdg_config_home, "dyn-nsupdate") + except ImportError: + return os.path.expanduser("~/.config/dyn-nsupdate") -def getMyIP(server): - return urlopen('https://'+server+'/checkip') +def urlopen(url, config): + if sys.version_info >= (3, 4, 3): + return urllib.request.urlopen(url, context=sslContext(config)).read().decode('utf-8').strip('\n') + else: + return urllib.request.urlopen(url).read().decode('utf-8').strip('\n') + +def getMyIP(family, config, methods = {}, verbose = 0): + '''Returns our current IP address ( can be "IPv4" or "IPv6"), detected as given by the configuration. + Additional detection methods can be supplied via .''' + method = config[family]['method'] + if method == 'none': + return None + elif method == 'remove': + return "" + elif method == 'web': + server = config[family].get('server', config['DEFAULT']['server']) + url = 'https://'+server+'/checkip' + try: + ip = urlopen(url, config) + except urllib.error.URLError: + raise Exception("Error fetching {}, make sure the URL is correct and the internet connection actually works.".format(url)) + if verbose >= VERBOSE_FULL: + print("Server",server,"says my",family,"is",ip) + return ip + elif method in methods: + return methods[method]() + else: + raise Exception("Unsupported "+family+" detection method: "+method) + +def getMyIPv4(config, verbose = 0): + '''Returns our current IPv4 address, detected as given by the configuration''' + return getMyIP("IPv4", config, verbose=verbose) + +def getMyIPv6(config, verbose = 0): + '''Returns our current IPv6 address, detected as given by the configuration''' + def local(): + device = config["IPv6"].get("device") + out = subprocess.check_output(["ip", "addr", "show"] + ([] if device is None else ["dev", device])) + for line in out.decode('utf-8').split('\n'): + m = re.search('inet6 ([a-fA-F0-9:]+)/64 ([a-zA-Z0-9 ]*)', line) + if m is not None: + ip = m.group(1) + flags = m.group(2).split() + if not 'temporary' in flags and not 'deprecated' in flags and not "link" in flags: + if verbose >= VERBOSE_FULL: + print("Local IPv6 detected to be",ip) + return ip + raise Exception("Unable to detect correct local IPv6 address") + return getMyIP("IPv6", config, methods={'local': local}, verbose=verbose) def getCurIP(domain, family): + '''Return the current IP of the given . can be socket.AF_INET or socket.AF_INET6.''' try: addr = socket.getaddrinfo(domain, None, family=family) return addr[0][4][0] @@ -50,26 +108,30 @@ def getCurIP(domain, family): return "" def getCurIPv4(domain): + '''Returns the current IPv4 address of the given domain''' return getCurIP(domain, socket.AF_INET) def getCurIPv6(domain): + '''Returns the current IPv6 address of the given 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.''' +def updateDomain(server, domain, ipv4, ipv6, password, config, verbose): + '''Update the given domain, using the server, password. ipv4 or ipv6 can be None to not update that record, or strings with the respective addresses. + Updates ae only performed if necessary. + 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)) + if verbose >= VERBOSE_FULL: + print("Current status of domain {} is: IPv4 address '{}', IPv6 address '{}'".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 alread up-to-date, nothing to do") + if verbose >= VERBOSE_FULL: + print("Everything already up-to-date, nothing to do") return True # we need to update the IP @@ -81,51 +143,61 @@ def update_domain(server, domain, ipv4, ipv6, password, verbose): if ipv6 is not None: url += '&ipv6='+urllib.parse.quote(ipv6) expected += " "+ipv6 - result = urlopen(url) + if verbose >= VERBOSE_FULL: + print("Request:",url) + result = urlopen(url, config) # did everything go as planned? if result == expected: - if verbose: - print("Successfully updated domain",domain) + if verbose >= VERBOSE_CHANGE: + msg = "Successfully updated domain {} on {}:".format(domain, server) + if ipv4 is not None: + if curIPv4 == ipv4: + msg += " IPv4={} (unchanged)".format(curIPv4) + else: + msg += " IPv4={} -> {}".format(curIPv4, ipv4) + if ipv4 is not None and ipv6 is not None: + msg += "," + if ipv6 is not None: + if curIPv6 == ipv6: + msg += " IPv6={} (unchanged)".format(curIPv6) + else: + msg += " IPv6={} -> {}".format(curIPv6, ipv6) + print(msg) # all went all right return True else: # Something went wrong print("Unexpected answer from server",server,"while updating",domain) - print(result) + print("Got '{}', expected '{}'".format(result, expected)) 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("-c", "--config", + dest="config", default=os.path.join(getConfigDir(), "dyn-ns-client.conf"), + help="The configuration file") parser.add_argument("-v", "--verbose", - action="store_true", dest="verbose", + action="count", dest="verbose", default=0, help="Be more verbose") - parser.add_argument("domains", metavar='DOMAIN', nargs='*', default=domains, - help="The domains to update") args = parser.parse_args() + + # read config + if not os.path.isfile(args.config): + raise Exception("The config file does not exist: "+args.config) + config = readConfig(args.config) - # 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 + # get our own addresses + myIPv4 = getMyIPv4(config, args.verbose) + myIPv6 = getMyIPv6(config, args.verbose) # update all the domains exitcode = 0 - for domain in args.domains: - if not update_domain(server, domain, myIPv4, myIPv6, args.password, verbose=args.verbose): + domains = map(str.strip, config['DEFAULT']['domains'].split(',')) + if not domains: + raise Exception("No domain given to update!") + for domain in domains: + if not updateDomain(config['DEFAULT']['server'], domain, myIPv4, myIPv6, config['DEFAULT']['password'], config, verbose=args.verbose): exitcode = 1 sys.exit(exitcode)