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# reximemoDNS
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#
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# RexiMemo adaptation of the MIT-licensed sudomemoDNS project.
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# See LICENSE and NOTICE.md for attribution.
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from datetime import datetime
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from ipaddress import IPv4Address, ip_address
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import os
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from socket import AF_INET, SOCK_DGRAM, socket
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from sys import platform
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from time import sleep
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from dnslib import A, DNSLabel, DNSRecord, QTYPE, RCODE, RR
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from dnslib.server import DNSServer
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REXIMEMODNS_VERSION = "1.0.0"
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DEFAULT_REXIMEMO_SERVER_IP = "141.147.76.115"
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DEFAULT_UPSTREAM_DNS = "8.8.8.8"
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# Keep this list aligned with RexiMemo's LOCAL_DNS_HOSTS in network_services.py.
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# conntest.nintendowifi.net is intentionally not intercepted.
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REXIMEMO_HOSTS = (
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"nas.nintendowifi.net",
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"flipnote.hatena.com",
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"ugomemo.hatena.ne.jp",
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)
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def get_platform():
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platforms = {
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"linux": "Linux",
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"linux1": "Linux",
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"linux2": "Linux",
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"darwin": "macOS",
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"win32": "Windows",
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}
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return platforms.get(platform, platform)
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def format_ip(address):
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"""Format an IPv4 address the way Nintendo connection screens display it."""
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octets = str(address).split(".")
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return ".".join(f"{int(octet):03d}" for octet in octets)
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def _ipv4_env(name, default):
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value = (os.environ.get(name) or default).strip()
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try:
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parsed = ip_address(value)
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except ValueError as exc:
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raise SystemExit(f"[ERROR] {name} must be a valid IPv4 address; got {value!r}") from exc
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if not isinstance(parsed, IPv4Address):
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raise SystemExit(f"[ERROR] {name} must be an IPv4 address; got {value!r}")
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return str(parsed)
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def get_ip():
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configured = (os.environ.get("REXIMEMODNS_BIND_IP") or "").strip()
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if configured:
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return _ipv4_env("REXIMEMODNS_BIND_IP", configured)
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probe = socket(AF_INET, SOCK_DGRAM)
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try:
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# The destination does not need to be reachable. Connecting a UDP socket
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# is only used to discover which local IPv4 address the OS would route.
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probe.connect(("10.255.255.255", 1))
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return probe.getsockname()[0]
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except OSError:
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return "127.0.0.1"
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finally:
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probe.close()
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def _port_env():
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raw = (os.environ.get("REXIMEMODNS_PORT") or "53").strip()
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try:
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value = int(raw)
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except ValueError as exc:
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raise SystemExit(f"[ERROR] REXIMEMODNS_PORT must be a number; got {raw!r}") from exc
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if not 1 <= value <= 65535:
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raise SystemExit("[ERROR] REXIMEMODNS_PORT must be between 1 and 65535")
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return value
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MY_IP = get_ip()
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REXIMEMO_SERVER_IP = _ipv4_env("REXIMEMODNS_SERVER_IP", DEFAULT_REXIMEMO_SERVER_IP)
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UPSTREAM_DNS = _ipv4_env("REXIMEMODNS_UPSTREAM_DNS", DEFAULT_UPSTREAM_DNS)
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DNS_PORT = _port_env()
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SERIAL = int((datetime.utcnow() - datetime(1970, 1, 1)).total_seconds())
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def _print_banner():
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print("+===============================+")
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print("| RexiMemo DNS Server |")
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print(f"| Version {REXIMEMODNS_VERSION:<13}|")
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print("+===============================+\n")
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print("== Welcome to reximemoDNS! ==")
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print(
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"This local DNS helper routes Flipnote Studio's Nintendo/Hatena service names "
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"to RexiMemo while forwarding unrelated DNS normally.\n"
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)
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print("== How To Use ==")
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print("First, make sure that your console is connected to the same network as this computer.\n")
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print("Then, put these settings in for DNS on your console:")
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print("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~")
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print(f"Primary DNS: {format_ip(MY_IP)}")
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print(f"Secondary DNS: {format_ip(DEFAULT_UPSTREAM_DNS)}")
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print("~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n")
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print("== RexiMemo Routing ==")
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print(f"RexiMemo server: {REXIMEMO_SERVER_IP}")
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for hostname in REXIMEMO_HOSTS:
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print(f" {hostname} -> {REXIMEMO_SERVER_IP}")
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print(f"Other DNS queries -> {UPSTREAM_DNS}\n")
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print("== Getting Help ==")
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print("Join the RexiMemo Discord server: https://discord.gg/K5mKWvaruF\n")
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class RexiMemoDNSLogger(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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qname = str(request.q.qname).rstrip(".")
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qtype = QTYPE.get(request.q.qtype, str(request.q.qtype))
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print(
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"[INFO] DNS request from %s: %s %s"
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% (handler.client_address[0], qtype, qname)
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)
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def log_reply(self, handler, reply):
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answer_count = len(reply.rr)
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print(
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"[INFO] DNS response to %s: %d answer%s"
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% (handler.client_address[0], answer_count, "" if answer_count == 1 else "s")
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)
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def log_error(self, handler, error):
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print("[ERROR] Invalid DNS request from %s: %s" % (handler.client_address[0], error))
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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 Resolver:
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def __init__(self):
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self.reximemo_names = {DNSLabel(name) for name in REXIMEMO_HOSTS}
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def _reximemo_reply(self, request):
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reply = request.reply()
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# Mirror RexiMemo's own DNS behavior: A/ANY gets the legacy-service IPv4
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# address. Other query types get an authoritative empty NOERROR response.
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if request.q.qtype in (QTYPE.A, QTYPE.ANY):
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reply.add_answer(
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RR(
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rname=request.q.qname,
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rtype=QTYPE.A,
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rclass=1,
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ttl=0,
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rdata=A(REXIMEMO_SERVER_IP),
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)
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)
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return reply
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def _forward(self, request, handler):
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try:
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raw = request.send(
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UPSTREAM_DNS,
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53,
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tcp=(getattr(handler, "protocol", "udp") == "tcp"),
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timeout=3,
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)
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reply = DNSRecord.parse(raw)
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# Never relay a mismatched DNS transaction as if it answered this query.
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if reply.header.id != request.header.id:
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raise ValueError("upstream DNS transaction ID mismatch")
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return reply
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except Exception as exc:
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print(f"[ERROR] Upstream DNS lookup via {UPSTREAM_DNS} failed: {exc}")
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reply = request.reply()
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reply.header.rcode = RCODE.SERVFAIL
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return reply
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def resolve(self, request, handler):
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if request.q.qname in self.reximemo_names:
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return self._reximemo_reply(request)
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return self._forward(request, handler)
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def main():
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_print_banner()
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print("[INFO] Starting reximemoDNS...")
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print("[INFO] Detected operating system:", get_platform())
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current_platform = get_platform()
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if current_platform in {"Linux", "macOS"}:
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print("[INFO] DNS uses UDP/TCP port 53, so this normally must run as root.")
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print("[INFO] If no requests appear, also check whether another service is already using port 53.")
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elif current_platform == "Windows":
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print("[INFO] Windows may ask you to allow reximemoDNS through the firewall.")
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resolver = Resolver()
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logger = RexiMemoDNSLogger()
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try:
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servers = [
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DNSServer(resolver=resolver, port=DNS_PORT, address=MY_IP, tcp=True, logger=logger),
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DNSServer(resolver=resolver, port=DNS_PORT, address=MY_IP, tcp=False, logger=logger),
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]
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except PermissionError:
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print("[ERROR] Permission denied while opening DNS port. Run as Administrator/root.")
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raise SystemExit(1)
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except OSError as exc:
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print(f"[ERROR] Could not bind DNS server to {MY_IP}:{DNS_PORT}: {exc}")
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raise SystemExit(1)
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print(f"[INFO] reximemoDNS is ready on {MY_IP}:{DNS_PORT} (UDP/TCP).")
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print("[INFO] Waiting for DNS requests from your console...")
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for server in servers:
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server.start_thread()
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try:
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while True:
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sleep(0.1)
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except KeyboardInterrupt:
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print("\n[INFO] Stopping reximemoDNS...")
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finally:
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for server in servers:
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server.stop()
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if __name__ == "__main__":
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main()
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