Initial commit for sudomemoDNS
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Austin Burk committed
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from datetime import datetime
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from time import sleep
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from dnslib import DNSLabel, QTYPE, RD, RR
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from dnslib import A, AAAA, CNAME, MX, NS, SOA, TXT
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from dnslib.server import DNSServer
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import socket
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import requests
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import json
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import sys
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def get_platform():
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platforms = {
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'linux1' : 'Linux',
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'linux2' : 'Linux',
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'darwin' : 'OS X',
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'win32' : 'Windows'
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}
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if sys.platform not in platforms:
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return sys.platform
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return platforms[sys.platform]
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SUDOMEMODNS_VERSION = "0.1"
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def get_ip():
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s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
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try:
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# doesn't even have to be reachable
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s.connect(('10.255.255.255', 1))
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IP = s.getsockname()[0]
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except:
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IP = '127.0.0.1'
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finally:
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s.close()
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return IP
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EPOCH = datetime(1970, 1, 1)
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SERIAL = int((datetime.utcnow() - EPOCH).total_seconds())
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MY_IP = get_ip()
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print("+===============================+")
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print("| Sudomemo DNS Server |")
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print("| Version " + SUDOMEMODNS_VERSION + " |")
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print("+===============================+\n")
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print("Hello! This server will allow you to connect to Sudomemo when")
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print("your Internet Service Provider does not work with custom DNS.\n")
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print("#### How To Use ####\n")
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print("The setup process does not differ from what is shown at")
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print("https://support.sudomemo.net/setup except for the values")
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print("to enter in your custom DNS settings.\n")
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print("First, make sure that your Nintendo DSi is connected to the")
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print("same network as this computer.")
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print("\nHere are the settings you will put in for DNS on your Nintendo DSi:\n")
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print("Primary DNS: ",MY_IP)
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print("Secondary DNS: 8.8.8.8")
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print("All other settings should match what is shown at the above URL.\n")
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print("#### Starting up ####\n")
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TYPE_LOOKUP = {
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A: QTYPE.A,
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AAAA: QTYPE.AAAA,
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CNAME: QTYPE.CNAME,
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MX: QTYPE.MX,
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NS: QTYPE.NS,
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SOA: QTYPE.SOA,
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TXT: QTYPE.TXT,
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}
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# Can't seem to turn off DNSLogger with a None type so let's just null it out with a dummy function
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class SudomemoDNSLogger(object):
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def log_recv(self, handler, data):
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pass
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def log_send(self, handler, data):
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pass
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def log_request(self, handler, request):
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print("[INFO] Received DNS request from DSi at " + handler.client_address[0])
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def log_reply(self, handler, reply):
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print("[INFO] Sent response to DSi at " + handler.client_address[0])
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def log_error(self, handler, e):
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logger.error("[INFO] Invalid DNS request from " + handler.client_address[0])
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def log_truncated(self, handler, reply):
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pass
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def log_data(self, dnsobj):
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pass
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class Record:
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def __init__(self, rdata_type, *args, rtype=None, rname=None, ttl=None, **kwargs):
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if isinstance(rdata_type, RD):
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# actually an instance, not a type
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self._rtype = TYPE_LOOKUP[rdata_type.__class__]
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rdata = rdata_type
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else:
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self._rtype = TYPE_LOOKUP[rdata_type]
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if rdata_type == SOA and len(args) == 2:
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# add sensible times to SOA
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args += ((
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SERIAL, # serial number
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60 * 60 * 1, # refresh
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60 * 60 * 3, # retry
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60 * 60 * 24, # expire
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60 * 60 * 1, # minimum
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),)
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rdata = rdata_type(*args)
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if rtype:
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self._rtype = rtype
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self._rname = rname
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self.kwargs = dict(
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rdata=rdata,
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ttl=self.sensible_ttl() if ttl is None else ttl,
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**kwargs,
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)
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def try_rr(self, q):
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if q.qtype == QTYPE.ANY or q.qtype == self._rtype:
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return self.as_rr(q.qname)
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def as_rr(self, alt_rname):
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return RR(rname=self._rname or alt_rname, rtype=self._rtype, **self.kwargs)
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def sensible_ttl(self):
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if self._rtype in (QTYPE.NS, QTYPE.SOA):
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return 60 * 60 * 24
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else:
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return 300
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@property
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def is_soa(self):
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return self._rtype == QTYPE.SOA
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def __str__(self):
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return '{} {}'.format(QTYPE[self._rtype], self.kwargs)
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ZONES = {}
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try:
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get_zones = requests.get("https://www.sudomemo.net/api/dns_zones.json", headers={'User-Agent': 'SudomemoDNS/' + SUDOMEMODNS_VERSION + ' (' + get_platform() + ')'})
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except requests.exceptions.Timeout:
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print("[ERROR] Couldn't load DNS data: connection to Sudomemo timed out.")
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print("[ERROR] Are you connected to the Internet?")
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except requests.exceptions.RequestException as e:
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print("[ERROR] Couldn't load DNS data.")
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print("[ERROR] Exception: ",e)
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sys.exit(1)
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try:
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zones = json.loads(get_zones.text)
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except ValueError as e:
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print("[ERROR] Couldn't load DNS data: invalid response from server")
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print("[ERROR] Check that you can visit sudomemo.net")
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for zone in zones:
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if zone["type"] == "a":
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ZONES[zone["name"]] = [ Record(A, zone["value"]) ]
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elif zone["type"] == "p":
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ZONES[zone["name"]] = [ Record(A, socket.gethostbyname(zone["value"])) ]
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print("[INFO] DNS information loaded successfully.")
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class Resolver:
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def __init__(self):
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self.zones = {DNSLabel(k): v for k, v in ZONES.items()}
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def resolve(self, request, handler):
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reply = request.reply()
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zone = self.zones.get(request.q.qname)
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if zone is not None:
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for zone_records in zone:
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rr = zone_records.try_rr(request.q)
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rr and reply.add_answer(rr)
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else:
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# no direct zone so look for an SOA record for a higher level zone
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for zone_label, zone_records in self.zones.items():
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if request.q.qname.matchSuffix(zone_label):
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try:
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soa_record = next(r for r in zone_records if r.is_soa)
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except StopIteration:
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continue
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else:
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reply.add_answer(soa_record.as_rr(zone_label))
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break
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return reply
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resolver = Resolver()
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dnsLogger = SudomemoDNSLogger()
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if get_platform() == 'linux':
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print("[INFO] Please note that you will have to run this as root or with permissions to bind to UDP port 53.")
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print("[INFO] If you aren't seeing any requests, check that this is the case first with lsof -i:53 (requires lsof)")
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print("[INFO] To run as root, prefix the command with 'sudo'")
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elif get_platform() == 'OS X':
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print("[INFO] Please note that you will have to run this as root or with permissions to bind to UDP port 53.")
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print("[INFO] If you aren't seeing any requests, check that this is the case first with lsof -i:53 (requires lsof)")
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print("[INFO] To run as root, prefix the command with 'sudo'")
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elif get_platform() == 'Windows':
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print("[INFO] Please note: On Windows, you will have to run this as Administrator.")
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print("[INFO] Right click on the .exe and select 'Run as administrator' to do so.")
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print("[INFO] If you aren't seeing any requests, make sure you have done so first.")
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print("[INFO] Disregard this message if you have already done so; as the message will always show")
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try:
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servers = [
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DNSServer(resolver=resolver, port=53, address=MY_IP, tcp=True, logger=dnsLogger),
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DNSServer(resolver=resolver, port=53, address=MY_IP, tcp=False, logger=dnsLogger),
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]
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except PermissionError:
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print("[ERROR] Permission error: check that you are running this as Administrator or root")
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sys.exit(1)
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print("[INFO] Starting Sudomemo DNS server.")
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print("[INFO] Now waiting for DNS requests from your Nintendo DSi System.")
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if __name__ == '__main__':
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for s in servers:
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s.start_thread()
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try:
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while 1:
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sleep(0.1)
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except KeyboardInterrupt:
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pass
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finally:
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for s in servers:
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s.stop()
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