Add some type annotations

demo/demo

@@ -4,6 +4,7 @@ import socket, sqlite3, subprocess, sys, time, weakref
 from collections import defaultdict
 from contextlib import contextmanager
 from threading import Thread
+from typing import Optional
 
 IPTABLES = 'iptables'
 SCREEN = 'screen'
@@ -242,7 +243,7 @@ gateway1.screen(['miniupnpd', '-d', '-f', 'miniupnpd.conf', '-P',
                  'miniupnpd.pid', '-a', g1_if_1.name, '-i', g1_if_0_name])
 
 @contextmanager
-def new_network(registry, reg_addr, serial, ca):
+def new_network(registry: Re6stNode, reg_addr: str, serial: str, ca: str):
     from OpenSSL import crypto
     import hashlib, sqlite3
     os.path.exists(ca) or subprocess.check_call(
@@ -272,7 +273,9 @@ def new_network(registry, reg_addr, serial, ca):
                 time.sleep(.1)
         """)).wait()
     db = sqlite3.connect(db_path, isolation_level=None)
-    def new_node(node, folder, args='', prefix_len=None, registry=registry_url):
+
+    def new_node(node: Re6stNode, folder: str, args: list[str]=[],
+                 prefix_len: Optional[int] = None, registry=registry_url):
         nodes.append(node)
         if not os.path.exists(folder + '/cert.crt'):
             dh_path = folder + '/dh2048.pem'
@@ -382,8 +385,9 @@ if args.hmac:
     t.start()
     del t
 
-_ll = {}
-def node_by_ll(addr):
+_ll: dict[str, tuple[Re6stNode, bool]] = {}
+
+def node_by_ll(addr: str) -> tuple[Re6stNode, bool]:
     try:
         return _ll[addr]
     except KeyError:
@@ -414,7 +418,7 @@ def node_by_ll(addr):
 
 
 def route_svg(ipv4, z=4):
-    graph = {}
+    graph: dict[Re6stNode, dict[tuple[Re6stNode, bool], list[Re6stNode]]] = {}
     for n in nodes:
         g = graph[n] = defaultdict(list)
         for r in n.get_routes():

re6st/cache.py

@@ -5,7 +5,7 @@ from . import utils, version, x509
 
 class Cache:
 
-    def __init__(self, db_path, registry, cert, db_size=200):
+    def __init__(self, db_path: str, registry, cert: x509.Cert, db_size=200):
         self._prefix = cert.prefix
         self._db_size = db_size
         self._decrypt = cert.decrypt
@@ -50,7 +50,7 @@ class Cache:
         self.warnProtocol()
         logging.info("Cache initialized.")
 
-    def _open(self, path):
+    def _open(self, path: str) -> sqlite3.Connection:
         db = sqlite3.connect(path, isolation_level=None)
         db.text_factory = str
         db.execute("PRAGMA synchronous = OFF")
@@ -141,7 +141,7 @@ class Cache:
             logging.warning("There's a new version of re6stnet:"
                             " you should update.")
 
-    def getDh(self, path):
+    def getDh(self, path: str):
         # We'd like to do a full check here but
         #   from OpenSSL import SSL
         #   SSL.Context(SSL.TLSv1_METHOD).load_tmp_dh(path)
@@ -173,11 +173,11 @@ class Cache:
                 logging.trace("- %s: %s%s", prefix, address,
                               ' (blacklisted)' if _try else '')
 
-    def cacheMinimize(self, size):
+    def cacheMinimize(self, size: int):
         with self._db:
             self._cacheMinimize(size)
 
-    def _cacheMinimize(self, size):
+    def _cacheMinimize(self, size: int):
         a = self._db.execute(
             "SELECT peer FROM volatile.stat ORDER BY try, RANDOM() LIMIT ?,-1",
             (size,)).fetchall()
@@ -186,26 +186,26 @@ class Cache:
             q("DELETE FROM peer WHERE prefix IN (?)", a)
             q("DELETE FROM volatile.stat WHERE peer IN (?)", a)
 
-    def connecting(self, prefix, connecting):
+    def connecting(self, prefix: str, connecting: bool):
         self._db.execute("UPDATE volatile.stat SET try=? WHERE peer=?",
                          (connecting, prefix))
 
     def resetConnecting(self):
         self._db.execute("UPDATE volatile.stat SET try=0")
 
-    def getAddress(self, prefix):
+    def getAddress(self, prefix: str) -> bool:
         r = self._db.execute("SELECT address FROM peer, volatile.stat"
                              " WHERE prefix=? AND prefix=peer AND try=0",
                              (prefix,)).fetchone()
         return r and r[0]
 
     @property
-    def my_address(self):
+    def my_address(self) -> str:
         for x, in self._db.execute("SELECT address FROM peer WHERE prefix=''"):
             return x
 
     @my_address.setter
-    def my_address(self, value):
+    def my_address(self, value: str):
         if value:
             with self._db as db:
                 db.execute("INSERT OR REPLACE INTO peer VALUES ('', ?)",
@@ -223,13 +223,15 @@ class Cache:
     # IOW, one should probably always put our own address there.
     _get_peer_sql = "SELECT %s FROM peer, volatile.stat" \
                     " WHERE prefix=peer AND prefix!=? AND try=?"
-    def getPeerList(self, failed=0, __sql=_get_peer_sql % "prefix, address"
+    def getPeerList(self, failed=False, __sql=_get_peer_sql % "prefix, address"
                                                         + " ORDER BY RANDOM()"):
         return self._db.execute(__sql, (self._prefix, failed))
-    def getPeerCount(self, failed=0, __sql=_get_peer_sql % "COUNT(*)"):
+
+    def getPeerCount(self, failed=False, __sql=_get_peer_sql % "COUNT(*)") \
+            -> int:
         return self._db.execute(__sql, (self._prefix, failed)).next()[0]
 
-    def getBootstrapPeer(self):
+    def getBootstrapPeer(self) -> tuple[str, str]:
         logging.info('Getting Boot peer...')
         try:
             bootpeer = self._registry.getBootstrapPeer(self._prefix)
@@ -243,7 +245,7 @@ class Cache:
                 return prefix, address
             logging.warning('Buggy registry sent us our own address')
 
-    def addPeer(self, prefix, address, set_preferred=False):
+    def addPeer(self, prefix: str, address: str, set_preferred=False):
         logging.debug('Adding peer %s: %s', prefix, address)
         with self._db:
             q = self._db.execute
@@ -267,7 +269,7 @@ class Cache:
                 q("INSERT OR REPLACE INTO peer VALUES (?,?)", (prefix, address))
             q("INSERT OR REPLACE INTO volatile.stat VALUES (?,0)", (prefix,))
 
-    def getCountry(self, ip):
+    def getCountry(self, ip: str) -> str:
         try:
             return self._registry.getCountry(self._prefix, ip).decode()
         except socket.error as e:

re6st/cli/conf.py

@@ -13,7 +13,7 @@ def create(path, text=None, mode=0o666):
     finally:
         os.close(fd)
 
-def loadCert(pem):
+def loadCert(pem: bytes):
     return crypto.load_certificate(crypto.FILETYPE_PEM, pem)
 
 def main():

re6st/cli/node.py

@@ -272,7 +272,7 @@ def main():
         call(args)
         args[3] = 'del'
         cleanup.append(lambda: subprocess.call(args))
-    def ip(object, *args):
+    def ip(object: str, *args):
         args = ['ip', '-6', object, 'add'] + list(args)
         call(args)
         args[3] = 'del'

re6st/ctl.py

@@ -34,13 +34,13 @@ class Array:
     def __init__(self, item):
         self._item = item
 
-    def encode(self, buffer, value):
+    def encode(self, buffer: bytes, value: list):
         buffer += uint16.pack(len(value))
         encode = self._item.encode
         for value in value:
             encode(buffer, value)
 
-    def decode(self, buffer, offset=0):
+    def decode(self, buffer: bytes, offset=0) -> tuple[int, list]:
         r = []
         o = offset + 2
         decode = self._item.decode
@@ -52,11 +52,11 @@ class Array:
 class String:
 
     @staticmethod
-    def encode(buffer, value):
+    def encode(buffer: bytes, value: str):
         buffer += value.encode("utf-8") + b'\0'
 
     @staticmethod
-    def decode(buffer, offset=0):
+    def decode(buffer: bytes, offset=0) -> tuple[int, str]:
         i = buffer.index(0, offset)
         return i + 1, buffer[offset:i].decode("utf-8")
 
@@ -171,7 +171,7 @@ class Babel:
 
     _decode = None
 
-    def __init__(self, socket_path, handler, network):
+    def __init__(self, socket_path: str, handler, network: str):
         self.socket_path = socket_path
         self.handler = handler
         self.network = network
@@ -304,7 +304,7 @@ class iterRoutes:
 
     _waiting = True
 
-    def __new__(cls, control_socket, network):
+    def __new__(cls, control_socket: str, network: str):
         self = object.__new__(cls)
         c = Babel(control_socket, self, network)
         c.request_dump()

re6st/debug.py

@@ -3,7 +3,7 @@ import errno, os, socket, stat, threading
 
 class Socket:
 
-    def __init__(self, socket):
+    def __init__(self, socket: socket.socket):
         # In case that the default timeout is not None.
         socket.settimeout(None)
         self._socket = socket
@@ -12,10 +12,10 @@ class Socket:
     def close(self):
         self._socket.close()
 
-    def write(self, data):
+    def write(self, data: bytes):
         self._socket.send(data)
 
-    def readline(self):
+    def readline(self) -> bytes:
         recv = self._socket.recv
         data = self._buf
         while True:

re6st/plib.py

 import binascii
 import logging, errno, os
+from typing import Optional
 from . import utils
 
 here = os.path.realpath(os.path.dirname(__file__))
 ovpn_server = os.path.join(here, 'ovpn-server')
 ovpn_client = os.path.join(here, 'ovpn-client')
-ovpn_log = None
+ovpn_log: Optional[str] = None
 
-def openvpn(iface, encrypt, *args, **kw):
+def openvpn(iface: str, encrypt, *args, **kw) -> utils.Popen:
     args = ['openvpn',
         '--dev-type', 'tap',
         '--dev', iface,
@@ -28,7 +29,8 @@ def openvpn(iface, encrypt, *args, **kw):
 
 ovpn_link_mtu_dict = {'udp4': 1432, 'udp6': 1450}
 
-def server(iface, max_clients, dh_path, fd, port, proto, encrypt, *args, **kw):
+def server(iface: str, max_clients: int, dh_path: str, fd: int,
+           port: int, proto: str, encrypt: bool, *args, **kw) -> utils.Popen:
     if proto == 'udp':
         proto = 'udp4'
     client_script = '%s %s' % (ovpn_server, fd)
@@ -49,7 +51,8 @@ def server(iface, max_clients, dh_path, fd, port, proto, encrypt, *args, **kw):
         *args, pass_fds=[fd], **kw)
 
 
-def client(iface, address_list, encrypt, *args, **kw):
+def client(iface: str, address_list: list[tuple[str, int, str]],
+           encrypt: bool, *args, **kw) -> utils.Popen:
     remote = ['--nobind', '--client']
     # XXX: We'd like to pass <connection> sections at command-line.
     link_mtu = set()
@@ -65,8 +68,10 @@ def client(iface, address_list, encrypt, *args, **kw):
     return openvpn(iface, encrypt, *remote, **kw)
 
 
-def router(ip, ip4, rt6, hello_interval, log_path, state_path, pidfile,
-           control_socket, default, hmac, *args, **kw):
+def router(ip: tuple[str, int], ip4, rt6: tuple[str, bool, bool],
+           hello_interval: int, log_path: str, state_path: str, pidfile: str,
+           control_socket: str, default: str,
+           hmac: tuple[bytes | None, bytes | None], *args, **kw) -> utils.Popen:
     network, gateway, has_ipv6_subtrees = rt6
     network_mask = int(network[network.index('/')+1:])
     ip, n = ip
@@ -83,7 +88,7 @@ def router(ip, ip4, rt6, hello_interval, log_path, state_path, pidfile,
             '-C', 'redistribute local deny',
             '-C', 'redistribute ip %s/%s eq %s' % (ip, n, n)]
     if hmac_sign:
-        def key(cmd, id, value):
+        def key(cmd: list[str], id: str, value: bytes):
             cmd += '-C', ('key type blake2s128 id %s value %s' %
                           (id, binascii.hexlify(value).decode()))
         key(cmd, 'sign', hmac_sign)

re6st/registry.py

@@ -22,10 +22,13 @@ import base64, hmac, hashlib, http.client, inspect, json, logging
 import mailbox, os, platform, random, select, smtplib, socket, sqlite3
 import string, sys, threading, time, weakref, zlib
 from collections import defaultdict, deque
+from collections.abc import Iterator
 from datetime import datetime
 from http.server import HTTPServer, BaseHTTPRequestHandler
 from email.mime.text import MIMEText
 from operator import itemgetter
+from typing import Tuple
+
 from OpenSSL import crypto
 from urllib.parse import urlparse, unquote, urlencode
 from . import ctl, tunnel, utils, version, x509
@@ -58,6 +61,8 @@ class RegistryServer:
     peers = 0, ()
     cert_duration = 365 * 86400
 
+    sessions: dict[str, list[tuple[bytes, int]]]
+
     def _geoiplookup(self, ip):
         raise HTTPError(http.client.BAD_REQUEST)
 
@@ -140,7 +145,7 @@ class RegistryServer:
         if self.geoip_db:
             from geoip2 import database, errors
             country = database.Reader(self.geoip_db).country
-            def geoiplookup(ip):
+            def geoiplookup(ip: str) -> Tuple[str, str]:
                 try:
                     req = country(ip)
                     return req.country.iso_code, req.continent.code
@@ -206,7 +211,7 @@ class RegistryServer:
         self.sock.sendto(prefix.encode() + bytes((0, code)),
                          ('::1', tunnel.PORT))
 
-    def recv(self, code):
+    def recv(self, code: int) -> tuple[str, str] | tuple[None, None]:
         try:
             prefix, msg = self.sock.recv(1 << 16).split(b'\0', 1)
             int(prefix, 2)
@@ -241,7 +246,7 @@ class RegistryServer:
     def babel_dump(self):
         self._wait_dump = False
 
-    def iterCert(self):
+    def iterCert(self) -> Iterator[Tuple[crypto.X509, str, str]]:
         for prefix, email, cert in self.db.execute(
                 "SELECT * FROM cert WHERE cert IS NOT NULL"):
             try:
@@ -341,12 +346,12 @@ class RegistryServer:
         if result:
             request.wfile.write(result)
 
-    def getPeerProtocol(self, cn):
+    def getPeerProtocol(self, cn: str) -> int:
         session, = self.sessions[cn]
         return session[1]
 
     @rpc
-    def hello(self, client_prefix, protocol='1'):
+    def hello(self, client_prefix: str, protocol='1') -> bytes:
         with self.lock:
             cert = self.getCert(client_prefix)
             key = utils.newHmacSecret()
@@ -356,7 +361,7 @@ class RegistryServer:
         assert len(key) == len(sign)
         return key + sign
 
-    def getCert(self, client_prefix):
+    def getCert(self, client_prefix: str) -> bytes:
         assert self.lock.locked()
         cert = self.db.execute("SELECT cert FROM cert"
                                " WHERE prefix=? AND cert IS NOT NULL",
@@ -366,19 +371,19 @@ class RegistryServer:
         return cert[0]
 
     @rpc_private
-    def isToken(self, token):
+    def isToken(self, token: str):
         with self.lock:
             if self.db.execute("SELECT 1 FROM token WHERE token = ?",
                                (token,)).fetchone():
                 return b"1"
 
     @rpc_private
-    def deleteToken(self, token):
+    def deleteToken(self, token: str):
         with self.lock:
             self.db.execute("DELETE FROM token WHERE token = ?", (token,))
 
     @rpc_private
-    def addToken(self, email, token):
+    def addToken(self, email: str, token: str | None) -> str:
         prefix_len = self.config.prefix_length
         if not prefix_len:
             raise HTTPError(http.client.FORBIDDEN)
@@ -506,7 +511,8 @@ class RegistryServer:
             q("UPDATE cert SET cert = 'reserved' WHERE prefix = ?", (prefix,))
 
     @rpc
-    def requestCertificate(self, token, req, location='', ip=''):
+    def requestCertificate(self, token: str | None, req: bytes,
+                           location: str='', ip: str=''):
         logging.debug("Requesting certificate with token %s", token)
         req = crypto.load_certificate_request(crypto.FILETYPE_PEM, req)
         with self.lock:
@@ -580,7 +586,7 @@ class RegistryServer:
         return cert
 
     @rpc
-    def renewCertificate(self, cn):
+    def renewCertificate(self, cn: str) -> bytes:
         with self.lock:
             with self.db as db:
                 pem = self.getCert(cn)
@@ -596,16 +602,16 @@ class RegistryServer:
                     cert.get_subject(), cert.get_pubkey(), not_after)
 
     @rpc
-    def getCa(self):
+    def getCa(self) -> bytes:
         return crypto.dump_certificate(crypto.FILETYPE_PEM, self.cert.ca)
 
     @rpc
-    def getDh(self, cn):
+    def getDh(self, cn: str) -> bytes:
         with open(self.config.dh, "rb") as f:
             return f.read()
 
     @rpc
-    def getNetworkConfig(self, cn):
+    def getNetworkConfig(self, cn: str) -> bytes:
         with self.lock:
             cert = self.getCert(cn)
             config = self.network_config.copy()
@@ -615,7 +621,7 @@ class RegistryServer:
                     v and base64.b64encode(x509.encrypt(cert, v)).decode()
         return zlib.compress(json.dumps(config).encode("utf-8"))
 
-    def _queryAddress(self, peer):
+    def _queryAddress(self, peer: str) -> str:
         logging.info("Querying address for %s/%s %r",
                      int(peer, 2), len(peer), peer)
         self.sendto(peer, 1)
@@ -633,12 +639,12 @@ class RegistryServer:
                      int(peer, 2), len(peer))
 
     @rpc
-    def getCountry(self, cn, address):
+    def getCountry(self, cn: str, address: str) -> str | None:
         country = self._geoiplookup(address)[0]
         return None if country == '*' else country
 
     @rpc
-    def getBootstrapPeer(self, cn):
+    def getBootstrapPeer(self, cn: str) -> bytes | None:
         logging.info("Answering bootstrap peer for %s", cn)
         with self.peers_lock:
             age, peers = self.peers
@@ -673,7 +679,7 @@ class RegistryServer:
         return x509.encrypt(cert, msg.encode())
 
     @rpc_private
-    def revoke(self, cn_or_serial):
+    def revoke(self, cn_or_serial: int | str):
         with self.lock, self.db:
             q = self.db.execute
             try:
@@ -694,12 +700,12 @@ class RegistryServer:
                 q("INSERT INTO crl VALUES (?,?)", (serial, not_after))
                 self.updateNetworkConfig()
 
-    def newHMAC(self, i, key=None):
+    def newHMAC(self, i: int, key: bytes=None):
        if key is None:
           key = os.urandom(16)
        self.setConfig(BABEL_HMAC[i], key)
 
-    def delHMAC(self, i):
+    def delHMAC(self, i: int):
        self.db.execute("DELETE FROM config WHERE name=?", (BABEL_HMAC[i],))
 
     @rpc_private
@@ -726,7 +732,7 @@ class RegistryServer:
         self.sendto(self.prefix, 0)
 
     @rpc_private
-    def getNodePrefix(self, email):
+    def getNodePrefix(self, email: str) -> str | None:
         with self.lock, self.db:
             try:
                 cert, = next(
@@ -738,7 +744,7 @@ class RegistryServer:
         return x509.subnetFromCert(certificate)
 
     @rpc_private
-    def getIPv6Address(self, email):
+    def getIPv6Address(self, email: str) -> str:
         cn = self.getNodePrefix(email)
         if cn:
             return utils.ipFromBin(
@@ -746,7 +752,7 @@ class RegistryServer:
                 + utils.binFromSubnet(cn))
 
     @rpc_private
-    def getIPv4Information(self, email):
+    def getIPv4Information(self, email: str) -> str | None:
         peer = self.getNodePrefix(email)
         if peer:
             peer = utils.binFromSubnet(peer)
@@ -765,7 +771,7 @@ class RegistryServer:
                 return msg.split(',')[0]
 
     @rpc_private
-    def versions(self):
+    def versions(self) -> str:
         with self.peers_lock:
             self.request_dump()
             peers = {prefix
@@ -791,7 +797,7 @@ class RegistryServer:
         return json.dumps(peer_dict)
 
     @rpc_private
-    def topology(self):
+    def topology(self) -> str:
         logging.debug("Computing topology")
         p = lambda p: '%s/%s' % (int(p, 2), len(p))
         peers = deque((p(self.prefix),))
@@ -827,11 +833,17 @@ class RegistryServer:
 
 
 class RegistryClient:
+    """
+    Client for the re6st registry.
+
+    Method calls are forwarded to the registry server.
+    String results are always returned as bytes.
+    """
 
     _hmac = None
     user_agent = "re6stnet/%s, %s" % (version.version, platform.platform())
 
-    def __init__(self, url, cert=None, auto_close=True):
+    def __init__(self, url: str, cert: x509.Cert=None, auto_close=True):
         self.cert = cert
         self.auto_close = auto_close
         url_parsed = urlparse(url)
@@ -843,7 +855,7 @@ class RegistryClient:
                           )[scheme](unquote(host), timeout=60)
         self._path = path.rstrip('/')
 
-    def __getattr__(self, name):
+    def __getattr__(self, name: str):
         getcallargs = getattr(RegistryServer, name).getcallargs
         def rpc(*args, **kw) -> bytes:
             kw = getcallargs(*args, **kw)

re6st/tests/test_unit/test_registry.py

@@ -11,11 +11,13 @@ import hashlib
 import time
 import tempfile
 from argparse import Namespace
+from sqlite3 import Cursor
+
 from OpenSSL import crypto
 from mock import Mock, patch
 from pathlib import Path
 
-from re6st import registry
+from re6st import registry, x509
 from re6st.tests.tools import *
 from re6st.tests import DEMO_PATH
 
@@ -23,7 +25,7 @@ from re6st.tests import DEMO_PATH
 # TODO test for request_dump, requestToken, getNetworkConfig, getBoostrapPeer
 # getIPV4Information, versions
 
-def load_config(filename="registry.json"):
+def load_config(filename: str="registry.json") -> Namespace:
     with open(filename) as f:
         config = json.load(f)
     config["dh"] = DEMO_PATH / "dh2048.pem"
@@ -37,13 +39,14 @@ def load_config(filename="registry.json"):
     return Namespace(**config)
 
 
-def get_cert(cur, prefix):
+def get_cert(cur: Cursor, prefix: str):
     res = cur.execute(
         "SELECT cert FROM cert WHERE prefix=?", (prefix,)).fetchone()
     return res[0]
 
 
-def insert_cert(cur, ca, prefix, not_after=None, email=None):
+def insert_cert(cur: Cursor, ca: x509.Cert, prefix: str,
+                not_after=None, email=None):
     key, csr = generate_csr()
     cert = generate_cert(ca.ca, ca.key, csr, prefix, insert_cert.serial, not_after)
     cur.execute("INSERT INTO cert VALUES (?,?,?)", (prefix, email, cert))
@@ -54,7 +57,7 @@ def insert_cert(cur, ca, prefix, not_after=None, email=None):
 insert_cert.serial = 0
 
 
-def delete_cert(cur, prefix):
+def delete_cert(cur: Cursor, prefix: str):
     cur.execute("DELETE FROM cert WHERE prefix = ?", (prefix,))
 
 

re6st/tests/tools.py

@@ -92,14 +92,14 @@ def create_ca_file(pkey_file, cert_file, serial=0x120010db80042):
     return key, cert
 
 
-def prefix2cn(prefix):
+def prefix2cn(prefix: str) -> str:
     return "%u/%u" % (int(prefix, 2), len(prefix))
 
-def serial2prefix(serial):
+def serial2prefix(serial: int) -> str:
     return bin(serial)[2:].rjust(16, '0')
 
 # pkey: private key
-def decrypt(pkey, incontent):
+def decrypt(pkey: bytes, incontent: bytes) -> bytes:
     with open("node.key", 'wb') as f:
         f.write(pkey)
     args = "openssl rsautl -decrypt -inkey node.key".split()

re6st/tunnel.py

@@ -2,8 +2,13 @@ import errno, json, logging, os, platform, random, socket
 import subprocess, struct, sys, time, weakref
 from collections import defaultdict, deque
 from bisect import bisect, insort
+from collections.abc import Iterator, Sequence
+from typing import Callable, TYPE_CHECKING
+
 from OpenSSL import crypto
 from . import ctl, plib, utils, version, x509
+if TYPE_CHECKING:
+    from . import cache
 
 PORT = 326
 
@@ -21,7 +26,8 @@ proto_dict = {
 proto_dict['tcp'] = proto_dict['tcp4']
 proto_dict['udp'] = proto_dict['udp4']
 
-def resolve(ip, port, proto):
+def resolve(ip, port, proto: str) \
+        -> tuple[socket.AddressFamily | None, Iterator[str]]:
     try:
         family, proto = proto_dict[proto]
     except KeyError:
@@ -31,16 +37,16 @@ def resolve(ip, port, proto):
 
 class MultiGatewayManager(dict):
 
-    def __init__(self, gateway):
+    def __init__(self, gateway: Callable[[str], str]):
         self._gw = gateway
 
-    def _route(self, cmd, dest, gw):
+    def _route(self, cmd: str, dest: str, gw: str):
         if gw:
             cmd = 'ip', '-4', 'route', cmd, '%s/32' % dest, 'via', gw
             logging.trace('%r', cmd)
             subprocess.check_call(cmd)
 
-    def add(self, dest, route):
+    def add(self, dest: str, route: bool):
         try:
             self[dest][1] += 1
         except KeyError:
@@ -48,7 +54,7 @@ class MultiGatewayManager(dict):
             self[dest] = [gw, 0]
             self._route('add', dest, gw)
 
-    def remove(self, dest):
+    def remove(self, dest: str):
         gw, count = self[dest]
         if count:
             self[dest][1] = count - 1
@@ -65,7 +71,8 @@ class Connection:
     serial = None
     time = float('inf')
 
-    def __init__(self, tunnel_manager, address_list, iface, prefix):
+    def __init__(self, tunnel_manager: "TunnelManager",
+                 address_list, iface, prefix):
         self.tunnel_manager = tunnel_manager
         self.address_list = address_list
         self.iface = iface
@@ -109,7 +116,7 @@ class Connection:
         if i:
             cache.addPeer(self._prefix, ','.join(self.address_list[i]), True)
         else:
-            cache.connecting(self._prefix, 0)
+            cache.connecting(self._prefix, False)
 
     def close(self):
         try:
@@ -198,7 +205,8 @@ class BaseTunnelManager:
     _geoiplookup = None
     _forward = None
 
-    def __init__(self, control_socket, cache, cert, conf_country, address=()):
+    def __init__(self, control_socket, cache: "cache.Cache", cert: x509.Cert,
+                 conf_country, address=()):
         self.cert = cert
         self._network = cert.network
         self._prefix = cert.prefix
@@ -329,7 +337,7 @@ class BaseTunnelManager:
     def _getPeer(self, prefix):
         return self._peers[bisect(self._peers, prefix) - 1]
 
-    def sendto(self, prefix, msg):
+    def sendto(self, prefix: str, msg):
         to = utils.ipFromBin(self._network + prefix), PORT
         peer = self._getPeer(prefix)
         if peer.prefix != prefix:
@@ -451,7 +459,7 @@ class BaseTunnelManager:
                          peer)
 
 
-    def _processPacket(self, msg, peer=None):
+    def _processPacket(self, msg: bytes, peer: x509.Peer|str=None):
         c = msg[0]
         msg = msg[1:]
         code = c & 0x7f
@@ -565,7 +573,7 @@ class BaseTunnelManager:
             self.selectTimeout(time.time() + 1 + self.cache.delay_restart,
                                self._restart)
 
-    def handleServerEvent(self, sock):
+    def handleServerEvent(self, sock: socket.socket):
         event, args = eval(sock.recv(65536))
         logging.debug("%s%r", event, args)
         r = getattr(self, '_ovpn_' + event.replace('-', '_'))(*args)
@@ -582,7 +590,7 @@ class BaseTunnelManager:
                 self._gateway_manager.add(trusted_ip, False)
             if prefix in self._connection_dict and self._prefix < prefix:
                 self._kill(prefix)
-                self.cache.connecting(prefix, 0)
+                self.cache.connecting(prefix, False)
         return True
 
     def _ovpn_client_disconnect(self, common_name, iface, serial, trusted_ip):
@@ -666,7 +674,8 @@ class TunnelManager(BaseTunnelManager):
 
     def __init__(self, control_socket, cache, cert, openvpn_args,
                  timeout, client_count, iface_list, conf_country, address,
-                 ip_changed, remote_gateway, disable_proto, neighbour_list=()):
+                 ip_changed, remote_gateway: Callable[[str], str],
+                 disable_proto: Sequence[str], neighbour_list=()):
         super(TunnelManager, self).__init__(control_socket,
                                             cache, cert, conf_country, address)
         self.ovpn_args = openvpn_args
@@ -878,7 +887,7 @@ class TunnelManager(BaseTunnelManager):
                             address_list.append((ip, x[1], x[2]))
                     continue
             address_list.append(x[:3])
-        self.cache.connecting(prefix, 1)
+        self.cache.connecting(prefix, True)
         if not address_list:
             return False
         logging.info('Establishing a connection with %u/%u',

re6st/upnpigd.py

@@ -17,7 +17,7 @@ class Forwarder:
     _lcg_n = 0
 
     @classmethod
-    def _getExternalPort(cls):
+    def _getExternalPort(cls) -> int:
         # Since _refresh() does not test all ports in a row, we prefer to
         # return random ports to maximize the chance to find a free port.
         # A linear congruential generator should be random enough, without
@@ -35,7 +35,7 @@ class Forwarder:
         self._u.discoverdelay = 200
         self._rules = []
 
-    def __getattr__(self, name):
+    def __getattr__(self, name: str):
         wrapped = getattr(self._u, name)
         def wrapper(*args, **kw):
             try:

re6st/utils.py

 import argparse, errno, fcntl, hashlib, logging, os, select as _select
 import shlex, signal, socket, sqlite3, struct, subprocess
 import sys, textwrap, threading, time, traceback
-
+from collections.abc import Iterator, Mapping
 
 HMAC_LEN = len(hashlib.sha1(b'').digest())
 
@@ -40,7 +40,7 @@ class FileHandler(logging.FileHandler):
         if self.lock.acquire(False):
             self.release()
 
-def setupLog(log_level, filename=None, **kw):
+def setupLog(log_level: int, filename: str | None=None, **kw):
     if log_level and filename:
         makedirs(os.path.dirname(filename))
         handler = FileHandler(filename)
@@ -184,7 +184,7 @@ def setCloexec(fd):
     flags = fcntl.fcntl(fd, fcntl.F_GETFD)
     fcntl.fcntl(fd, fcntl.F_SETFD, flags | fcntl.FD_CLOEXEC)
 
-def select(R, W, T):
+def select(R: Mapping, W: Mapping, T):
     try:
         r, w, _ = _select.select(R, W, (),
             max(0, min(T)[0] - time.time()) if T else None)
@@ -208,15 +208,15 @@ def makedirs(*args):
         if e.errno != errno.EEXIST:
             raise
 
-def binFromIp(ip):
+def binFromIp(ip: str) -> str:
     return binFromRawIp(socket.inet_pton(socket.AF_INET6, ip))
 
-def binFromRawIp(ip):
+def binFromRawIp(ip: bytes) -> str:
     ip1, ip2 = struct.unpack('>QQ', ip)
     return bin(ip1)[2:].rjust(64, '0') + bin(ip2)[2:].rjust(64, '0')
 
 
-def ipFromBin(ip, suffix=''):
+def ipFromBin(ip: str, suffix='') -> str:
     suffix_len = 128 - len(ip)
     if suffix_len > 0:
         ip += suffix.rjust(suffix_len, '0')
@@ -225,11 +225,11 @@ def ipFromBin(ip, suffix=''):
     return socket.inet_ntop(socket.AF_INET6,
         struct.pack('>QQ', int(ip[:64], 2), int(ip[64:], 2)))
 
-def dump_address(address):
+def dump_address(address: str) -> str:
     return ';'.join(map(','.join, address))
 
 # Yield ip, port, protocol, and country if it is in the address
-def parse_address(address_list):
+def parse_address(address_list: str) -> Iterator[tuple[str, str, str, str]]:
     for address in address_list.split(';'):
         try:
             a = address.split(',')
@@ -239,16 +239,18 @@ def parse_address(address_list):
             logging.warning("Failed to parse node address %r (%s)",
                             address, e)
 
-def binFromSubnet(subnet):
+def binFromSubnet(subnet: str) -> str:
     p, l = subnet.split('/')
     return bin(int(p))[2:].rjust(int(l), '0')
 
-def newHmacSecret():
+def _newHmacSecret():
     from random import getrandbits as g
     pack = struct.Struct(">QQI").pack
     assert len(pack(0,0,0)) == HMAC_LEN
+    # A closure is built to avoid rebuilding the `pack` function at each call.
     return lambda x=None: pack(g(64) if x is None else x, g(64), g(32))
-newHmacSecret = newHmacSecret()
+
+newHmacSecret = _newHmacSecret() # https://github.com/python/mypy/issues/1174
 
 ### Integer serialization
 # - supports values from 0 to 0x202020202020201f
@@ -256,7 +258,7 @@ newHmacSecret = newHmacSecret()
 # - there's always a unique way to encode a value
 # - the 3 first bits code the number of bytes
 
-def packInteger(i):
+def packInteger(i: int) -> bytes:
     for n in range(8):
         x = 32 << 8 * n
         if i < x:
@@ -264,7 +266,7 @@ def packInteger(i):
         i -= x
     raise OverflowError
 
-def unpackInteger(x):
+def unpackInteger(x: bytes) -> tuple[int, int] | None:
     n = x[0] >> 5
     try:
         i, = struct.unpack("!Q", b'\0' * (7 - n) + x[:n+1])

re6st/x509.py

 # -*- coding: utf-8 -*-
 import calendar, hashlib, hmac, logging, os, struct, subprocess, threading, time
+from typing import Callable, Any
+
 from OpenSSL import crypto
 from cryptography.hazmat.primitives import hashes
 from cryptography.hazmat.primitives.asymmetric import padding
@@ -9,14 +11,14 @@ from cryptography.x509 import load_pem_x509_certificate
 from . import utils
 from .version import protocol
 
-def newHmacSecret():
+def newHmacSecret() -> bytes:
     return utils.newHmacSecret(int(time.time() * 1000000))
 
-def networkFromCa(ca):
+def networkFromCa(ca: crypto.X509) -> str:
     # TODO: will be ca.serial_number after migration to cryptography
     return bin(ca.get_serial_number())[3:]
 
-def subnetFromCert(cert):
+def subnetFromCert(cert: crypto.X509) -> str:
     return cert.get_subject().CN
 
 def notBefore(cert: crypto.X509) -> int:
@@ -27,13 +29,13 @@ def notAfter(cert: crypto.X509) -> int:
     return calendar.timegm(time.strptime(cert.get_notAfter().decode(),
                                          '%Y%m%d%H%M%SZ'))
 
-def openssl(*args, fds=[]):
+def openssl(*args: str, fds=[]) -> utils.Popen:
     return utils.Popen(('openssl',) + args,
         stdin=subprocess.PIPE,
         stdout=subprocess.PIPE,
         stderr=subprocess.PIPE, pass_fds=fds)
 
-def encrypt(cert, data):
+def encrypt(cert: bytes, data: bytes) -> bytes:
     r, w = os.pipe()
     try:
         threading.Thread(target=os.write, args=(w, cert)).start()
@@ -47,10 +49,12 @@ def encrypt(cert, data):
         raise subprocess.CalledProcessError(p.returncode, 'openssl', err)
     return out
 
-def fingerprint(cert, alg='sha1'):
+def fingerprint(cert: crypto.X509, alg='sha1'):
     return hashlib.new(alg, crypto.dump_certificate(crypto.FILETYPE_ASN1, cert))
 
-def maybe_renew(path, cert, info, renew, force=False):
+def maybe_renew(path: str, cert: crypto.X509, info: str,
+                renew: Callable[[], bytes],
+                force=False) -> tuple[crypto.X509, int]:
     from .registry import RENEW_PERIOD
     while True:
         if force:
@@ -94,7 +98,7 @@ class NewSessionError(Exception):
 
 class Cert:
 
-    def __init__(self, ca, key, cert=None):
+    def __init__(self, ca: str, key: str, cert: str | None=None):
         self.ca_path = ca
         self.cert_path = cert
         self.key_path = key
@@ -112,24 +116,24 @@ class Cert:
                 self.cert = self.loadVerify(f.read().encode())
 
     @property
-    def prefix(self):
+    def prefix(self) -> str:
         return utils.binFromSubnet(subnetFromCert(self.cert))
 
     @property
-    def network(self):
+    def network(self) -> str:
         return networkFromCa(self.ca)
 
     @property
-    def subject_serial(self):
+    def subject_serial(self) -> int:
         return int(self.cert.get_subject().serialNumber)
 
     @property
-    def openvpn_args(self):
+    def openvpn_args(self) -> tuple[str, ...]:
         return ('--ca', self.ca_path,
                 '--cert', self.cert_path,
                 '--key', self.key_path)
 
-    def maybeRenew(self, registry, crl):
+    def maybeRenew(self, registry, crl) -> int:
         self.cert, next_renew = maybe_renew(self.cert_path, self.cert,
               "Certificate", lambda: registry.renewCertificate(self.prefix),
               self.cert.get_serial_number() in crl)
@@ -165,7 +169,6 @@ class Cert:
         return r
 
     def verify(self, sign: bytes, data: bytes):
-        assert isinstance(data, bytes)
         pub_key = self.ca_crypto.public_key()
         pub_key.verify(
             sign,
@@ -175,14 +178,13 @@ class Cert:
         )
 
     def sign(self, data: bytes) -> bytes:
-        assert isinstance(data, bytes)
         return self.key_crypto.sign(
             data,
             padding.PKCS1v15(),
             hashes.SHA512()
         )
 
-    def decrypt(self, data):
+    def decrypt(self, data: bytes) -> bytes:
         p = openssl('rsautl', '-decrypt', '-inkey', self.key_path)
         out, err = p.communicate(data)
         if p.returncode:
@@ -232,8 +234,9 @@ class Peer:
     serial = None
     stop_date = float('inf')
     version = b''
+    cert: crypto.X509
 
-    def __init__(self, prefix):
+    def __init__(self, prefix: str):
         self.prefix = prefix
 
     @property
@@ -249,7 +252,7 @@ class Peer:
     def __lt__(self, other):
         return self.prefix < (other if type(other) is str else other.prefix)
 
-    def hello0(self, cert):
+    def hello0(self, cert: crypto.X509) -> bytes:
         if self._hello < time.time():
             try:
                 # Always assume peer is not old, in case it has just upgraded,
@@ -264,7 +267,7 @@ class Peer:
     def hello0Sent(self):
         self._hello = time.time() + 60
 
-    def hello(self, cert, protocol):
+    def hello(self, cert: Cert, protocol: int) -> bytes:
         key = self._key = newHmacSecret()
         h = encrypt(crypto.dump_certificate(crypto.FILETYPE_PEM, self.cert),
                     key)
@@ -274,10 +277,10 @@ class Peer:
         return b''.join((b'\0\0\0\2', PACKED_PROTOCOL if protocol else b'',
                         h, cert.sign(h)))
 
-    def _hmac(self, msg):
+    def _hmac(self, msg: bytes) -> bytes:
         return hmac.HMAC(self._key, msg, hashlib.sha1).digest()
 
-    def newSession(self, key, protocol):
+    def newSession(self, key: bytes, protocol: int):
         if key <= self._key:
             raise NewSessionError(self._key, key)
         self._key = key
@@ -285,12 +288,13 @@ class Peer:
         self._last = None
         self.protocol = protocol
 
-    def verify(self, sign, data):
+    def verify(self, sign: bytes, data: bytes):
         crypto.verify(self.cert, sign, data, 'sha512')
 
     seqno_struct = struct.Struct("!L")
 
-    def decode(self, msg, _unpack=seqno_struct.unpack):
+    def decode(self, msg: bytes, _unpack=seqno_struct.unpack) \
+            -> tuple[int, bytes, int | None] | bytes:
         seqno, = _unpack(msg[:4])
         if seqno <= 2:
             msg = msg[4:]
@@ -306,7 +310,7 @@ class Peer:
             self._i = seqno
             return msg[4:i]
 
-    def encode(self, msg, _pack=seqno_struct.pack):
+    def encode(self, msg: str | bytes, _pack=seqno_struct.pack) -> bytes:
         self._j += 1
         if type(msg) is str:
             msg = msg.encode()