Initial commit

README.md

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+TereStun — STUN over Teredo
+===========================
+
+TereStun is a very simple unitility to determine external IPv4 address and source port over NAT, using Teredo protocol.
+
+In other words, this is a STUN-like client over Teredo.
+
+```
+$ ./terestun.pyz --help
+usage: Teredo STUN [-h] [-s SERVER] [-p PORT] [--ip-only] [--port-only]
+
+Get IPv4 address and source port over Teredo network
+
+options:
+  -h, --help            show this help message and exit
+  -s SERVER, --server SERVER
+                        Teredo server
+  -p PORT, --port PORT  Source port to use
+  --ip-only             Show only IPv4 address, without port
+  --port-only           Show only source port, without IPv4 address
+
+$ ./terestun.pyz
+142.251.36.110:44254
+```

build.sh

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+#!/bin/bash
+python -m pip install . --target build
+find build -path '*/__pycache__*' -delete
+mv build/terestun/__main__.py build/
+python -m zipapp -c -p '/usr/bin/env python3' build -o terestun.pyz

pyproject.toml

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+[build-system]
+requires = ["setuptools>=61.0"]
+build-backend = "setuptools.build_meta"
+
+[project]
+name = "terestun"
+version = "0.0.1"
+authors = [
+  { name="ValdikSS", email="iam@valdikss.org.ru" },
+]
+description = "STUN client using Teredo protocol"
+readme = "README.md"
+requires-python = ">=3.4"
+classifiers = [
+    "Programming Language :: Python :: 3",
+    "License :: OSI Approved :: MIT License",
+    "Operating System :: OS Independent",
+]
+
+[project.urls]
+"Homepage" = "https://github.com/valdikss/terestun"
+"Bug Tracker" = "https://github.com/valdikss/terestun/issues"

src/terestun/__main__.py

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+#!/usr/bin/env python3
+
+import sys
+import socket
+import argparse
+
+DATA = b"\x00\x01\x00\x00\x2a\x3c\xfa\x40\x75\xe9\xbf\x57\x00\x60\x00\x00" \
+       b"\x00\x00\x08\x3a\xff\xfe\x80\x00\x00\x00\x00\x00\x00\x00\x00\xff" \
+       b"\xff\xff\xff\xff\xff\xff\x02\x00\x00\x00\x00\x00\x00\x00\x00\x00" \
+       b"\x00\x00\x00\x00\x02\x85\x00\x7d\x37\x00\x00\x00\x00"
+
+parser = argparse.ArgumentParser(
+        prog = 'Teredo STUN',
+        description = 'Get IPv4 address and source port over Teredo network')
+parser.add_argument('-s', '--server', default='win10.ipv6.microsoft.com',
+                    help='Teredo server')
+parser.add_argument('-p', '--port', type=int, default=0,
+                    help='Source port to use')
+parser.add_argument('--ip-only', action='store_true',
+                    help='Show only IPv4 address, without port')
+parser.add_argument('--port-only', action='store_true',
+                    help='Show only source port, without IPv4 address')
+args = parser.parse_args()
+
+s = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
+s.settimeout(10)
+try:
+    s.bind(('0.0.0.0', args.port))
+    s.sendto(DATA, (args.server, 3544))
+    response, source = s.recvfrom(512)
+    s.close()
+except socket.error as e:
+    print(e, file=sys.stderr)
+    sys.exit(1)
+except (KeyboardInterrupt, SystemExit):
+    sys.exit(2)
+if not len(response) > 64:
+    print("Not enough data", file=sys.stderr)
+    sys.exit(3)
+
+port_raw = response[15:17]
+port = int.from_bytes(port_raw, 'big') ^ 0xFFFF
+
+ip_raw = response[17:21]
+ip = int.from_bytes(ip_raw, 'big') ^ 0xFFFFFFFF
+ip1 = (ip >> 24) % 256
+ip2 = (ip >> 16) % 256
+ip3 = (ip >> 8) % 256
+ip4 = ip % 256
+
+if args.port_only:
+    print(port)
+elif args.ip_only:
+    print("{}.{}.{}.{}".format(ip1, ip2, ip3, ip4))
+else:
+    print("{}.{}.{}.{}:{}".format(ip1, ip2, ip3, ip4, port))