/mandos/trunk : revision 591

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#!/usr/bin/python2.7

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#!/usr/bin/python

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# -*- mode: python; coding: utf-8 -*-

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#

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# Mandos server - give out binary blobs to connecting clients.

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# "AvahiService" class, and some lines in "main".

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#

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# Everything else is

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#

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# This program is free software: you can redistribute it and/or modify

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# it under the terms of the GNU General Public License as published by

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import binascii

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import tempfile

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import itertools

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import collections

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import dbus

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import dbus.service

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import ctypes.util

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import xml.dom.minidom

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import inspect

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import GnuPGInterface

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try:

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SO_BINDTODEVICE = socket.SO_BINDTODEVICE

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except ImportError:

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SO_BINDTODEVICE = None

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version = "1.6.8"

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version = "1.5.4"

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stored_state_file = "clients.pickle"

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logger = logging.getLogger()

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syslogger = None

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syslogger = (logging.handlers.SysLogHandler

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(facility = logging.handlers.SysLogHandler.LOG_DAEMON,

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address = str("/dev/log")))

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try:

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if_nametoindex = (ctypes.cdll.LoadLibrary

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SIOCGIFINDEX = 0x8933 # From /usr/include/linux/sockios.h

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with contextlib.closing(socket.socket()) as s:

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ifreq = fcntl.ioctl(s, SIOCGIFINDEX,

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struct.pack(b"16s16x", interface))

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interface_index = struct.unpack("I", ifreq[16:20])[0]

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struct.pack(str("16s16x"),

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interface))

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interface_index = struct.unpack(str("I"),

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ifreq[16:20])[0]

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return interface_index

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def initlogger(debug, level=logging.WARNING):

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"""init logger and add loglevel"""

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global syslogger

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syslogger = (logging.handlers.SysLogHandler

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(facility =

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logging.handlers.SysLogHandler.LOG_DAEMON,

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address = "/dev/log"))

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syslogger.setFormatter(logging.Formatter

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('Mandos [%(process)d]: %(levelname)s:'

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' %(message)s'))

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class PGPEngine(object):

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"""A simple class for OpenPGP symmetric encryption & decryption"""

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def __init__(self):

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self.gnupg = GnuPGInterface.GnuPG()

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self.tempdir = tempfile.mkdtemp(prefix="mandos-")

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self.gnupgargs = ['--batch',

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'--home', self.tempdir,

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'--force-mdc',

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'--quiet',

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'--no-use-agent']

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self.gnupg = GnuPGInterface.GnuPG()

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self.gnupg.options.meta_interactive = False

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self.gnupg.options.homedir = self.tempdir

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self.gnupg.options.extra_args.extend(['--force-mdc',

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'--quiet',

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'--no-use-agent'])

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def __enter__(self):

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return self

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def password_encode(self, password):

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# Passphrase can not be empty and can not contain newlines or

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# NUL bytes. So we prefix it and hex encode it.

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encoded = b"mandos" + binascii.hexlify(password)

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if len(encoded) > 2048:

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# GnuPG can't handle long passwords, so encode differently

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encoded = (b"mandos" + password.replace(b"\\", b"\\\\")

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.replace(b"\n", b"\\n")

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.replace(b"\0", b"\\x00"))

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return encoded

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return b"mandos" + binascii.hexlify(password)

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def encrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir=self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['gpg', '--symmetric',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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ciphertext, err = proc.communicate(input = data)

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if proc.returncode != 0:

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raise PGPError(err)

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull, "w") as devnull:

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try:

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proc = self.gnupg.run(['--symmetric'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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ciphertext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return ciphertext

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def decrypt(self, data, password):

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passphrase = self.password_encode(password)

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with tempfile.NamedTemporaryFile(dir = self.tempdir

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) as passfile:

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passfile.write(passphrase)

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passfile.flush()

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proc = subprocess.Popen(['gpg', '--decrypt',

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'--passphrase-file',

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passfile.name]

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+ self.gnupgargs,

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stdin = subprocess.PIPE,

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stdout = subprocess.PIPE,

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stderr = subprocess.PIPE)

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decrypted_plaintext, err = proc.communicate(input

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= data)

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if proc.returncode != 0:

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raise PGPError(err)

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self.gnupg.passphrase = self.password_encode(password)

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with open(os.devnull, "w") as devnull:

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try:

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proc = self.gnupg.run(['--decrypt'],

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create_fhs=['stdin', 'stdout'],

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attach_fhs={'stderr': devnull})

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with contextlib.closing(proc.handles['stdin']) as f:

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f.write(data)

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with contextlib.closing(proc.handles['stdout']) as f:

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decrypted_plaintext = f.read()

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proc.wait()

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except IOError as e:

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raise PGPError(e)

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self.gnupg.passphrase = None

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return decrypted_plaintext

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class AvahiError(Exception):

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def __init__(self, value, *args, **kwargs):

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self.value = value

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return super(AvahiError, self).__init__(value, *args,

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**kwargs)

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super(AvahiError, self).__init__(value, *args, **kwargs)

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def __unicode__(self):

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return unicode(repr(self.value))

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class AvahiServiceError(AvahiError):

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pass

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Used to optionally bind to the specified interface.

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name: string; Example: 'Mandos'

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type: string; Example: '_mandos._tcp'.

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See <https://www.iana.org/assignments/service-names-port-numbers>

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See <http://www.dns-sd.org/ServiceTypes.html>

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port: integer; what port to announce

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TXT: list of strings; TXT record for the service

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domain: string; Domain to publish on, default to .local if empty.

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elif state == avahi.ENTRY_GROUP_FAILURE:

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logger.critical("Avahi: Error in group state changed %s",

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unicode(error))

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raise AvahiGroupError("State changed: {!s}"

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raise AvahiGroupError("State changed: {0!s}"

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.format(error))

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def cleanup(self):

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"""Add the new name to the syslog messages"""

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ret = AvahiService.rename(self)

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syslogger.setFormatter(logging.Formatter

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('Mandos ({}) [%(process)d]:'

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('Mandos ({0}) [%(process)d]:'

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' %(levelname)s: %(message)s'

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.format(self.name)))

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return ret

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def timedelta_to_milliseconds(td):

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"Convert a datetime.timedelta() to milliseconds"

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return ((td.days * 24 * 60 * 60 * 1000)

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+ (td.seconds * 1000)

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+ (td.microseconds // 1000))

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class Client(object):

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"""A representation of a client host served by this server.

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runtime_expansions: Allowed attributes for runtime expansion.

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expires: datetime.datetime(); time (UTC) when a client will be

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disabled, or None

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server_settings: The server_settings dict from main()

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"""

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runtime_expansions = ("approval_delay", "approval_duration",

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"fingerprint", "host", "interval",

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"last_approval_request", "last_checked_ok",

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"last_enabled", "name", "timeout")

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client_defaults = { "timeout": "PT5M",

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"extended_timeout": "PT15M",

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"interval": "PT2M",

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client_defaults = { "timeout": "5m",

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"extended_timeout": "15m",

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"interval": "2m",

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"checker": "fping -q -- %%(host)s",

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"host": "",

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"approval_delay": "PT0S",

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"approval_duration": "PT1S",

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"approval_delay": "0s",

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"approval_duration": "1s",

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"approved_by_default": "True",

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"enabled": "True",

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}

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def timeout_milliseconds(self):

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"Return the 'timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.timeout)

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def extended_timeout_milliseconds(self):

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"Return the 'extended_timeout' attribute in milliseconds"

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return timedelta_to_milliseconds(self.extended_timeout)

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def interval_milliseconds(self):

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"Return the 'interval' attribute in milliseconds"

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return timedelta_to_milliseconds(self.interval)

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def approval_delay_milliseconds(self):

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return timedelta_to_milliseconds(self.approval_delay)

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@staticmethod

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def config_parser(config):

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"""Construct a new dict of client settings of this form:

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"rb") as secfile:

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client["secret"] = secfile.read()

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else:

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raise TypeError("No secret or secfile for section {}"

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raise TypeError("No secret or secfile for section {0}"

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.format(section))

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client["timeout"] = string_to_delta(section["timeout"])

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client["extended_timeout"] = string_to_delta(

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return settings

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def __init__(self, settings, name = None, server_settings=None):

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def __init__(self, settings, name = None):

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self.name = name

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if server_settings is None:

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server_settings = {}

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self.server_settings = server_settings

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# adding all client settings

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for setting, value in settings.items():

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for setting, value in settings.iteritems():

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setattr(self, setting, value)

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if self.enabled:

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if self.checker_initiator_tag is not None:

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gobject.source_remove(self.checker_initiator_tag)

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self.checker_initiator_tag = (gobject.timeout_add

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(int(self.interval

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.total_seconds() * 1000),

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(self.interval_milliseconds(),

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self.start_checker))

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# Schedule a disable() when 'timeout' has passed

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if self.disable_initiator_tag is not None:

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gobject.source_remove(self.disable_initiator_tag)

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self.disable_initiator_tag = (gobject.timeout_add

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(int(self.timeout

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.total_seconds() * 1000),

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self.disable))

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(self.timeout_milliseconds(),

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self.disable))

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# Also start a new checker *right now*.

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self.start_checker()

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self.disable_initiator_tag = None

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if getattr(self, "enabled", False):

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self.disable_initiator_tag = (gobject.timeout_add

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(int(timeout.total_seconds()

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* 1000), self.disable))

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(timedelta_to_milliseconds

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(timeout), self.disable))

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self.expires = datetime.datetime.utcnow() + timeout

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def need_approval(self):

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# If a checker exists, make sure it is not a zombie

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try:

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pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

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except AttributeError:

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pass

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except OSError as error:

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if error.errno != errno.ECHILD:

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raise

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except (AttributeError, OSError) as error:

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if (isinstance(error, OSError)

684

and error.errno != errno.ECHILD):

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raise error

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else:

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if pid:

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logger.warning("Checker was a zombie")

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# Start a new checker if needed

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if self.checker is None:

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# Escape attributes for the shell

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escaped_attrs = { attr:

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re.escape(unicode(getattr(self,

689

attr)))

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for attr in self.runtime_expansions }

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escaped_attrs = dict(

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(attr, re.escape(unicode(getattr(self, attr))))

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for attr in

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self.runtime_expansions)

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try:

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command = self.checker_command % escaped_attrs

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except TypeError as error:

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710

# in normal mode, that is already done by daemon(),

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# and in debug mode we don't want to. (Stdin is

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# always replaced by /dev/null.)

705

# The exception is when not debugging but nevertheless

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# running in the foreground; use the previously

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# created wnull.

708

popen_args = {}

709

if (not self.server_settings["debug"]

710

and self.server_settings["foreground"]):

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popen_args.update({"stdout": wnull,

712

"stderr": wnull })

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self.checker = subprocess.Popen(command,

714

close_fds=True,

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shell=True, cwd="/",

716

**popen_args)

715

shell=True, cwd="/")

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except OSError as error:

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logger.error("Failed to start subprocess",

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718

exc_info=error)

720

return True

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719

self.checker_callback_tag = (gobject.child_watch_add

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(self.checker.pid,

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self.checker_callback,

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data=command))

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# The checker may have completed before the gobject

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724

# watch was added. Check for this.

727

try:

728

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

729

except OSError as error:

730

if error.errno == errno.ECHILD:

731

# This should never happen

732

logger.error("Child process vanished",

733

exc_info=error)

734

return True

735

raise

725

pid, status = os.waitpid(self.checker.pid, os.WNOHANG)

736

726

if pid:

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gobject.source_remove(self.checker_callback_tag)

738

728

self.checker_callback(pid, status, command)

774

764

# "Set" method, so we fail early here:

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765

if byte_arrays and signature != "ay":

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766

raise ValueError("Byte arrays not supported for non-'ay'"

777

" signature {!r}".format(signature))

767

" signature {0!r}".format(signature))

778

768

def decorator(func):

779

769

func._dbus_is_property = True

780

770

func._dbus_interface = dbus_interface

828

818

class DBusPropertyException(dbus.exceptions.DBusException):

829

819

"""A base class for D-Bus property-related exceptions

830

820

"""

831

pass

821

def __unicode__(self):

822

return unicode(str(self))

823

832

824

833

825

class DBusPropertyAccessException(DBusPropertyException):

834

826

"""A property's access permissions disallows an operation.

857

849

If called like _is_dbus_thing("method") it returns a function

858

850

suitable for use as predicate to inspect.getmembers().

859

851

"""

860

return lambda obj: getattr(obj, "_dbus_is_{}".format(thing),

852

return lambda obj: getattr(obj, "_dbus_is_{0}".format(thing),

861

853

False)

862

854

863

855

def _get_all_dbus_things(self, thing):

912

904

# The byte_arrays option is not supported yet on

913

905

# signatures other than "ay".

914

906

if prop._dbus_signature != "ay":

915

raise ValueError("Byte arrays not supported for non-"

916

"'ay' signature {!r}"

917

.format(prop._dbus_signature))

907

raise ValueError

918

908

value = dbus.ByteArray(b''.join(chr(byte)

919

909

for byte in value))

920

910

prop(value)

984

974

(prop,

985

975

"_dbus_annotations",

986

976

{}))

987

for name, value in annots.items():

977

for name, value in annots.iteritems():

988

978

ann_tag = document.createElement(

989

979

"annotation")

990

980

ann_tag.setAttribute("name", name)

993

983

# Add interface annotation tags

994

984

for annotation, value in dict(

995

985

itertools.chain.from_iterable(

996

annotations().items()

986

annotations().iteritems()

997

987

for name, annotations in

998

988

self._get_all_dbus_things("interface")

999

989

if name == if_tag.getAttribute("name")

1000

)).items():

990

)).iteritems():

1001

991

ann_tag = document.createElement("annotation")

1002

992

ann_tag.setAttribute("name", annotation)

1003

993

ann_tag.setAttribute("value", value)

1059

1049

"""

1060

1050

def wrapper(cls):

1061

1051

for orig_interface_name, alt_interface_name in (

1062

alt_interface_names.items()):

1052

alt_interface_names.iteritems()):

1063

1053

attr = {}

1064

1054

interface_names = set()

1065

1055

# Go though all attributes of the class

1078

1068

interface_names.add(alt_interface)

1079

1069

# Is this a D-Bus signal?

1080

1070

if getattr(attribute, "_dbus_is_signal", False):

1081

# Extract the original non-method undecorated

1082

# function by black magic

1071

# Extract the original non-method function by

1072

# black magic

1083

1073

nonmethod_func = (dict(

1084

1074

zip(attribute.func_code.co_freevars,

1085

1075

attribute.__closure__))["func"]

1182

1172

attribute.func_closure)))

1183

1173

if deprecate:

1184

1174

# Deprecate all alternate interfaces

1185

iname="_AlternateDBusNames_interface_annotation{}"

1175

iname="_AlternateDBusNames_interface_annotation{0}"

1186

1176

for interface_name in interface_names:

1187

1177

@dbus_interface_annotations(interface_name)

1188

1178

def func(self):

1197

1187

if interface_names:

1198

1188

# Replace the class with a new subclass of it with

1199

1189

# methods, signals, etc. as created above.

1200

cls = type(b"{}Alternate".format(cls.__name__),

1190

cls = type(b"{0}Alternate".format(cls.__name__),

1201

1191

(cls,), attr)

1202

1192

return cls

1203

1193

return wrapper

1244

1234

to the D-Bus. Default: no transform

1245

1235

variant_level: D-Bus variant level. Default: 1

1246

1236

"""

1247

attrname = "_{}".format(dbus_name)

1237

attrname = "_{0}".format(dbus_name)

1248

1238

def setter(self, value):

1249

1239

if hasattr(self, "dbus_object_path"):

1250

1240

if (not hasattr(self, attrname) or

1280

1270

approval_delay = notifychangeproperty(dbus.UInt64,

1281

1271

"ApprovalDelay",

1282

1272

type_func =

1283

lambda td: td.total_seconds()

1284

* 1000)

1273

timedelta_to_milliseconds)

1285

1274

approval_duration = notifychangeproperty(

1286

1275

dbus.UInt64, "ApprovalDuration",

1287

type_func = lambda td: td.total_seconds() * 1000)

1276

type_func = timedelta_to_milliseconds)

1288

1277

host = notifychangeproperty(dbus.String, "Host")

1289

1278

timeout = notifychangeproperty(dbus.UInt64, "Timeout",

1290

type_func = lambda td:

1291

td.total_seconds() * 1000)

1279

type_func =

1280

timedelta_to_milliseconds)

1292

1281

extended_timeout = notifychangeproperty(

1293

1282

dbus.UInt64, "ExtendedTimeout",

1294

type_func = lambda td: td.total_seconds() * 1000)

1283

type_func = timedelta_to_milliseconds)

1295

1284

interval = notifychangeproperty(dbus.UInt64,

1296

1285

"Interval",

1297

1286

type_func =

1298

lambda td: td.total_seconds()

1299

* 1000)

1287

timedelta_to_milliseconds)

1300

1288

checker_command = notifychangeproperty(dbus.String, "Checker")

1301

1289

1302

1290

del notifychangeproperty

1330

1318

*args, **kwargs)

1331

1319

1332

1320

def start_checker(self, *args, **kwargs):

1333

old_checker_pid = getattr(self.checker, "pid", None)

1321

old_checker = self.checker

1322

if self.checker is not None:

1323

old_checker_pid = self.checker.pid

1324

else:

1325

old_checker_pid = None

1334

1326

r = Client.start_checker(self, *args, **kwargs)

1335

1327

# Only if new checker process was started

1336

1328

if (self.checker is not None

1345

1337

1346

1338

def approve(self, value=True):

1347

1339

self.approved = value

1348

gobject.timeout_add(int(self.approval_duration.total_seconds()

1349

* 1000), self._reset_approved)

1340

gobject.timeout_add(timedelta_to_milliseconds

1341

(self.approval_duration),

1342

self._reset_approved)

1350

1343

self.send_changedstate()

1351

1344

1352

1345

## D-Bus methods, signals & properties

1455

1448

access="readwrite")

1456

1449

def ApprovalDelay_dbus_property(self, value=None):

1457

1450

if value is None: # get

1458

return dbus.UInt64(self.approval_delay.total_seconds()

1459

* 1000)

1451

return dbus.UInt64(self.approval_delay_milliseconds())

1460

1452

self.approval_delay = datetime.timedelta(0, 0, 0, value)

1461

1453

1462

1454

# ApprovalDuration - property

1464

1456

access="readwrite")

1465

1457

def ApprovalDuration_dbus_property(self, value=None):

1466

1458

if value is None: # get

1467

return dbus.UInt64(self.approval_duration.total_seconds()

1468

* 1000)

1459

return dbus.UInt64(timedelta_to_milliseconds(

1460

self.approval_duration))

1469

1461

self.approval_duration = datetime.timedelta(0, 0, 0, value)

1470

1462

1471

1463

# Name - property

1537

1529

access="readwrite")

1538

1530

def Timeout_dbus_property(self, value=None):

1539

1531

if value is None: # get

1540

return dbus.UInt64(self.timeout.total_seconds() * 1000)

1532

return dbus.UInt64(self.timeout_milliseconds())

1541

1533

old_timeout = self.timeout

1542

1534

self.timeout = datetime.timedelta(0, 0, 0, value)

1543

1535

# Reschedule disabling

1554

1546

gobject.source_remove(self.disable_initiator_tag)

1555

1547

self.disable_initiator_tag = (

1556

1548

gobject.timeout_add(

1557

int((self.expires - now).total_seconds()

1558

* 1000), self.disable))

1549

timedelta_to_milliseconds(self.expires - now),

1550

self.disable))

1559

1551

1560

1552

# ExtendedTimeout - property

1561

1553

@dbus_service_property(_interface, signature="t",

1562

1554

access="readwrite")

1563

1555

def ExtendedTimeout_dbus_property(self, value=None):

1564

1556

if value is None: # get

1565

return dbus.UInt64(self.extended_timeout.total_seconds()

1566

* 1000)

1557

return dbus.UInt64(self.extended_timeout_milliseconds())

1567

1558

self.extended_timeout = datetime.timedelta(0, 0, 0, value)

1568

1559

1569

1560

# Interval - property

1571

1562

access="readwrite")

1572

1563

def Interval_dbus_property(self, value=None):

1573

1564

if value is None: # get

1574

return dbus.UInt64(self.interval.total_seconds() * 1000)

1565

return dbus.UInt64(self.interval_milliseconds())

1575

1566

self.interval = datetime.timedelta(0, 0, 0, value)

1576

1567

if getattr(self, "checker_initiator_tag", None) is None:

1577

1568

return

1610

1601

@dbus_service_property(_interface, signature="ay",

1611

1602

access="write", byte_arrays=True)

1612

1603

def Secret_dbus_property(self, value):

1613

self.secret = bytes(value)

1604

self.secret = str(value)

1614

1605

1615

1606

del _interface

1616

1607

1682

1673

logger.debug("Protocol version: %r", line)

1683

1674

try:

1684

1675

if int(line.strip().split()[0]) > 1:

1685

raise RuntimeError(line)

1676

raise RuntimeError

1686

1677

except (ValueError, IndexError, RuntimeError) as error:

1687

1678

logger.error("Unknown protocol version: %s", error)

1688

1679

return

1737

1728

if self.server.use_dbus:

1738

1729

# Emit D-Bus signal

1739

1730

client.NeedApproval(

1740

client.approval_delay.total_seconds()

1741

* 1000, client.approved_by_default)

1731

client.approval_delay_milliseconds(),

1732

client.approved_by_default)

1742

1733

else:

1743

1734

logger.warning("Client %s was not approved",

1744

1735

client.name)

1750

1741

#wait until timeout or approved

1751

1742

time = datetime.datetime.now()

1752

1743

client.changedstate.acquire()

1753

client.changedstate.wait(delay.total_seconds())

1744

client.changedstate.wait(

1745

float(timedelta_to_milliseconds(delay)

1746

/ 1000))

1754

1747

client.changedstate.release()

1755

1748

time2 = datetime.datetime.now()

1756

1749

if (time2 - time) >= delay:

1893

1886

1894

1887

def add_pipe(self, parent_pipe, proc):

1895

1888

"""Dummy function; override as necessary"""

1896

raise NotImplementedError()

1889

raise NotImplementedError

1897

1890

1898

1891

1899

1892

class IPv6_TCPServer(MultiprocessingMixInWithPipe,

1955

1948

try:

1956

1949

self.socket.setsockopt(socket.SOL_SOCKET,

1957

1950

SO_BINDTODEVICE,

1958

(self.interface + "\0")

1959

.encode("utf-8"))

1951

str(self.interface

1952

+ '\0'))

1960

1953

except socket.error as error:

1961

1954

if error.errno == errno.EPERM:

1962

logger.error("No permission to bind to"

1963

" interface %s", self.interface)

1955

logger.error("No permission to"

1956

" bind to interface %s",

1957

self.interface)

1964

1958

elif error.errno == errno.ENOPROTOOPT:

1965

1959

logger.error("SO_BINDTODEVICE not available;"

1966

1960

" cannot bind to interface %s",

1967

1961

self.interface)

1968

1962

elif error.errno == errno.ENODEV:

1969

logger.error("Interface %s does not exist,"

1970

" cannot bind", self.interface)

1963

logger.error("Interface %s does not"

1964

" exist, cannot bind",

1965

self.interface)

1971

1966

else:

1972

1967

raise

1973

1968

# Only bind(2) the socket if we really need to.

1976

1971

if self.address_family == socket.AF_INET6:

1977

1972

any_address = "::" # in6addr_any

1978

1973

else:

1979

any_address = "0.0.0.0" # INADDR_ANY

1974

any_address = socket.INADDR_ANY

1980

1975

self.server_address = (any_address,

1981

1976

self.server_address[1])

1982

1977

elif not self.server_address[1]:

2098

2093

return True

2099

2094

2100

2095

2101

def rfc3339_duration_to_delta(duration):

2102

"""Parse an RFC 3339 "duration" and return a datetime.timedelta

2103

2104

>>> rfc3339_duration_to_delta("P7D")

2105

datetime.timedelta(7)

2106

>>> rfc3339_duration_to_delta("PT60S")

2107

datetime.timedelta(0, 60)

2108

>>> rfc3339_duration_to_delta("PT60M")

2109

datetime.timedelta(0, 3600)

2110

>>> rfc3339_duration_to_delta("PT24H")

2111

datetime.timedelta(1)

2112

>>> rfc3339_duration_to_delta("P1W")

2113

datetime.timedelta(7)

2114

>>> rfc3339_duration_to_delta("PT5M30S")

2115

datetime.timedelta(0, 330)

2116

>>> rfc3339_duration_to_delta("P1DT3M20S")

2117

datetime.timedelta(1, 200)

2118

"""

2119

2120

# Parsing an RFC 3339 duration with regular expressions is not

2121

# possible - there would have to be multiple places for the same

2122

# values, like seconds. The current code, while more esoteric, is

2123

# cleaner without depending on a parsing library. If Python had a

2124

# built-in library for parsing we would use it, but we'd like to

2125

# avoid excessive use of external libraries.

2126

2127

# New type for defining tokens, syntax, and semantics all-in-one

2128

Token = collections.namedtuple("Token",

2129

("regexp", # To match token; if

2130

# "value" is not None,

2131

# must have a "group"

2132

# containing digits

2133

"value", # datetime.timedelta or

2134

# None

2135

"followers")) # Tokens valid after

2136

# this token

2137

# RFC 3339 "duration" tokens, syntax, and semantics; taken from

2138

# the "duration" ABNF definition in RFC 3339, Appendix A.

2139

token_end = Token(re.compile(r"$"), None, frozenset())

2140

token_second = Token(re.compile(r"(\d+)S"),

2141

datetime.timedelta(seconds=1),

2142

frozenset((token_end,)))

2143

token_minute = Token(re.compile(r"(\d+)M"),

2144

datetime.timedelta(minutes=1),

2145

frozenset((token_second, token_end)))

2146

token_hour = Token(re.compile(r"(\d+)H"),

2147

datetime.timedelta(hours=1),

2148

frozenset((token_minute, token_end)))

2149

token_time = Token(re.compile(r"T"),

2150

None,

2151

frozenset((token_hour, token_minute,

2152

token_second)))

2153

token_day = Token(re.compile(r"(\d+)D"),

2154

datetime.timedelta(days=1),

2155

frozenset((token_time, token_end)))

2156

token_month = Token(re.compile(r"(\d+)M"),

2157

datetime.timedelta(weeks=4),

2158

frozenset((token_day, token_end)))

2159

token_year = Token(re.compile(r"(\d+)Y"),

2160

datetime.timedelta(weeks=52),

2161

frozenset((token_month, token_end)))

2162

token_week = Token(re.compile(r"(\d+)W"),

2163

datetime.timedelta(weeks=1),

2164

frozenset((token_end,)))

2165

token_duration = Token(re.compile(r"P"), None,

2166

frozenset((token_year, token_month,

2167

token_day, token_time,

2168

token_week)))

2169

# Define starting values

2170

value = datetime.timedelta() # Value so far

2171

found_token = None

2172

followers = frozenset((token_duration,)) # Following valid tokens

2173

s = duration # String left to parse

2174

# Loop until end token is found

2175

while found_token is not token_end:

2176

# Search for any currently valid tokens

2177

for token in followers:

2178

match = token.regexp.match(s)

2179

if match is not None:

2180

# Token found

2181

if token.value is not None:

2182

# Value found, parse digits

2183

factor = int(match.group(1), 10)

2184

# Add to value so far

2185

value += factor * token.value

2186

# Strip token from string

2187

s = token.regexp.sub("", s, 1)

2188

# Go to found token

2189

found_token = token

2190

# Set valid next tokens

2191

followers = found_token.followers

2192

break

2193

else:

2194

# No currently valid tokens were found

2195

raise ValueError("Invalid RFC 3339 duration")

2196

# End token found

2197

return value

2198

2199

2200

2096

def string_to_delta(interval):

2201

2097

"""Parse a string and return a datetime.timedelta

2202

2098

2213

2109

>>> string_to_delta('5m 30s')

2214

2110

datetime.timedelta(0, 330)

2215

2111

"""

2216

2217

try:

2218

return rfc3339_duration_to_delta(interval)

2219

except ValueError:

2220

pass

2221

2222

2112

timevalue = datetime.timedelta(0)

2223

2113

for s in interval.split():

2224

2114

try:

2225

suffix = s[-1]

2115

suffix = unicode(s[-1])

2226

2116

value = int(s[:-1])

2227

2117

if suffix == "d":

2228

2118

delta = datetime.timedelta(value)

2235

2125

elif suffix == "w":

2236

2126

delta = datetime.timedelta(0, 0, 0, 0, 0, 0, value)

2237

2127

else:

2238

raise ValueError("Unknown suffix {!r}"

2128

raise ValueError("Unknown suffix {0!r}"

2239

2129

.format(suffix))

2240

except IndexError as e:

2130

except (ValueError, IndexError) as e:

2241

2131

raise ValueError(*(e.args))

2242

2132

timevalue += delta

2243

2133

return timevalue

2258

2148

# Close all standard open file descriptors

2259

2149

null = os.open(os.devnull, os.O_NOCTTY | os.O_RDWR)

2260

2150

if not stat.S_ISCHR(os.fstat(null).st_mode):

2261

raise OSError(errno.ENODEV, "{} not a character device"

2151

raise OSError(errno.ENODEV,

2152

"{0} not a character device"

2262

2153

.format(os.devnull))

2263

2154

os.dup2(null, sys.stdin.fileno())

2264

2155

os.dup2(null, sys.stdout.fileno())

2274

2165

2275

2166

parser = argparse.ArgumentParser()

2276

2167

parser.add_argument("-v", "--version", action="version",

2277

version = "%(prog)s {}".format(version),

2168

version = "%(prog)s {0}".format(version),

2278

2169

help="show version number and exit")

2279

2170

parser.add_argument("-i", "--interface", metavar="IF",

2280

2171

help="Bind to interface IF")

2286

2177

help="Run self-test")

2287

2178

parser.add_argument("--debug", action="store_true",

2288

2179

help="Debug mode; run in foreground and log"

2289

" to terminal", default=None)

2180

" to terminal")

2290

2181

parser.add_argument("--debuglevel", metavar="LEVEL",

2291

2182

help="Debug level for stdout output")

2292

2183

parser.add_argument("--priority", help="GnuTLS"

2299

2190

" files")

2300

2191

parser.add_argument("--no-dbus", action="store_false",

2301

2192

dest="use_dbus", help="Do not provide D-Bus"

2302

" system bus interface", default=None)

2193

" system bus interface")

2303

2194

parser.add_argument("--no-ipv6", action="store_false",

2304

dest="use_ipv6", help="Do not use IPv6",

2305

default=None)

2195

dest="use_ipv6", help="Do not use IPv6")

2306

2196

parser.add_argument("--no-restore", action="store_false",

2307

2197

dest="restore", help="Do not restore stored"

2308

" state", default=None)

2198

" state")

2309

2199

parser.add_argument("--socket", type=int,

2310

2200

help="Specify a file descriptor to a network"

2311

2201

" socket to use instead of creating one")

2312

2202

parser.add_argument("--statedir", metavar="DIR",

2313

2203

help="Directory to save/restore state in")

2314

parser.add_argument("--foreground", action="store_true",

2315

help="Run in foreground", default=None)

2316

parser.add_argument("--no-zeroconf", action="store_false",

2317

dest="zeroconf", help="Do not use Zeroconf",

2318

default=None)

2319

2204

2320

2205

options = parser.parse_args()

2321

2206

2322

2207

if options.check:

2323

2208

import doctest

2324

fail_count, test_count = doctest.testmod()

2325

sys.exit(os.EX_OK if fail_count == 0 else 1)

2209

doctest.testmod()

2210

sys.exit()

2326

2211

2327

2212

# Default values for config file for server-global settings

2328

2213

server_defaults = { "interface": "",

2330

2215

"port": "",

2331

2216

"debug": "False",

2332

2217

"priority":

2333

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP:+SIGN-RSA-SHA224:+SIGN-RSA-RMD160",

2218

"SECURE256:!CTYPE-X.509:+CTYPE-OPENPGP",

2334

2219

"servicename": "Mandos",

2335

2220

"use_dbus": "True",

2336

2221

"use_ipv6": "True",

2337

2222

"debuglevel": "",

2338

2223

"restore": "True",

2339

2224

"socket": "",

2340

"statedir": "/var/lib/mandos",

2341

"foreground": "False",

2342

"zeroconf": "True",

2225

"statedir": "/var/lib/mandos"

2343

2226

}

2344

2227

2345

2228

# Parse config file for server-global settings

2350

2233

# Convert the SafeConfigParser object to a dict

2351

2234

server_settings = server_config.defaults()

2352

2235

# Use the appropriate methods on the non-string config options

2353

for option in ("debug", "use_dbus", "use_ipv6", "foreground"):

2236

for option in ("debug", "use_dbus", "use_ipv6"):

2354

2237

server_settings[option] = server_config.getboolean("DEFAULT",

2355

2238

option)

2356

2239

if server_settings["port"]:

2372

2255

for option in ("interface", "address", "port", "debug",

2373

2256

"priority", "servicename", "configdir",

2374

2257

"use_dbus", "use_ipv6", "debuglevel", "restore",

2375

"statedir", "socket", "foreground", "zeroconf"):

2258

"statedir", "socket"):

2376

2259

value = getattr(options, option)

2377

2260

if value is not None:

2378

2261

server_settings[option] = value

2379

2262

del options

2380

2263

# Force all strings to be unicode

2381

2264

for option in server_settings.keys():

2382

if isinstance(server_settings[option], bytes):

2383

server_settings[option] = (server_settings[option]

2384

.decode("utf-8"))

2385

# Force all boolean options to be boolean

2386

for option in ("debug", "use_dbus", "use_ipv6", "restore",

2387

"foreground", "zeroconf"):

2388

server_settings[option] = bool(server_settings[option])

2389

# Debug implies foreground

2390

if server_settings["debug"]:

2391

server_settings["foreground"] = True

2265

if type(server_settings[option]) is str:

2266

server_settings[option] = unicode(server_settings[option])

2392

2267

# Now we have our good server settings in "server_settings"

2393

2268

2394

2269

##################################################################

2395

2270

2396

if (not server_settings["zeroconf"] and

2397

not (server_settings["port"]

2398

or server_settings["socket"] != "")):

2399

parser.error("Needs port or socket to work without"

2400

" Zeroconf")

2401

2402

2271

# For convenience

2403

2272

debug = server_settings["debug"]

2404

2273

debuglevel = server_settings["debuglevel"]

2406

2275

use_ipv6 = server_settings["use_ipv6"]

2407

2276

stored_state_path = os.path.join(server_settings["statedir"],

2408

2277

stored_state_file)

2409

foreground = server_settings["foreground"]

2410

zeroconf = server_settings["zeroconf"]

2411

2278

2412

2279

if debug:

2413

2280

initlogger(debug, logging.DEBUG)

2420

2287

2421

2288

if server_settings["servicename"] != "Mandos":

2422

2289

syslogger.setFormatter(logging.Formatter

2423

('Mandos ({}) [%(process)d]:'

2290

('Mandos ({0}) [%(process)d]:'

2424

2291

' %(levelname)s: %(message)s'

2425

2292

.format(server_settings

2426

2293

["servicename"])))

2434

2301

global mandos_dbus_service

2435

2302

mandos_dbus_service = None

2436

2303

2437

socketfd = None

2438

if server_settings["socket"] != "":

2439

socketfd = server_settings["socket"]

2440

2304

tcp_server = MandosServer((server_settings["address"],

2441

2305

server_settings["port"]),

2442

2306

ClientHandler,

2446

2310

gnutls_priority=

2447

2311

server_settings["priority"],

2448

2312

use_dbus=use_dbus,

2449

socketfd=socketfd)

2450

if not foreground:

2451

pidfilename = "/run/mandos.pid"

2452

if not os.path.isdir("/run/."):

2453

pidfilename = "/var/run/mandos.pid"

2454

pidfile = None

2313

socketfd=(server_settings["socket"]

2314

or None))

2315

if not debug:

2316

pidfilename = "/var/run/mandos.pid"

2455

2317

try:

2456

2318

pidfile = open(pidfilename, "w")

2457

2319

except IOError as e:

2473

2335

os.setuid(uid)

2474

2336

except OSError as error:

2475

2337

if error.errno != errno.EPERM:

2476

raise

2338

raise error

2477

2339

2478

2340

if debug:

2479

2341

# Enable all possible GnuTLS debugging

2496

2358

os.close(null)

2497

2359

2498

2360

# Need to fork before connecting to D-Bus

2499

if not foreground:

2361

if not debug:

2500

2362

# Close all input and output, do double fork, etc.

2501

2363

daemon()

2502

2364

2522

2384

use_dbus = False

2523

2385

server_settings["use_dbus"] = False

2524

2386

tcp_server.use_dbus = False

2525

if zeroconf:

2526

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2527

service = AvahiServiceToSyslog(name =

2528

server_settings["servicename"],

2529

servicetype = "_mandos._tcp",

2530

protocol = protocol, bus = bus)

2531

if server_settings["interface"]:

2532

service.interface = (if_nametoindex

2533

(server_settings["interface"]

2534

.encode("utf-8")))

2387

protocol = avahi.PROTO_INET6 if use_ipv6 else avahi.PROTO_INET

2388

service = AvahiServiceToSyslog(name =

2389

server_settings["servicename"],

2390

servicetype = "_mandos._tcp",

2391

protocol = protocol, bus = bus)

2392

if server_settings["interface"]:

2393

service.interface = (if_nametoindex

2394

(str(server_settings["interface"])))

2535

2395

2536

2396

global multiprocessing_manager

2537

2397

multiprocessing_manager = multiprocessing.Manager()

2544

2404

old_client_settings = {}

2545

2405

clients_data = {}

2546

2406

2547

# This is used to redirect stdout and stderr for checker processes

2548

global wnull

2549

wnull = open(os.devnull, "w") # A writable /dev/null

2550

# Only used if server is running in foreground but not in debug

2551

# mode

2552

if debug or not foreground:

2553

wnull.close()

2554

2555

2407

# Get client data and settings from last running state.

2556

2408

if server_settings["restore"]:

2557

2409

try:

2561

2413

os.remove(stored_state_path)

2562

2414

except IOError as e:

2563

2415

if e.errno == errno.ENOENT:

2564

logger.warning("Could not load persistent state: {}"

2416

logger.warning("Could not load persistent state: {0}"

2565

2417

.format(os.strerror(e.errno)))

2566

2418

else:

2567

2419

logger.critical("Could not load persistent state:",

2572

2424

"EOFError:", exc_info=e)

2573

2425

2574

2426

with PGPEngine() as pgp:

2575

for client_name, client in clients_data.items():

2576

# Skip removed clients

2577

if client_name not in client_settings:

2578

continue

2579

2427

for client_name, client in clients_data.iteritems():

2580

2428

# Decide which value to use after restoring saved state.

2581

2429

# We have three different values: Old config file,

2582

2430

# new config file, and saved state.

2603

2451

if datetime.datetime.utcnow() >= client["expires"]:

2604

2452

if not client["last_checked_ok"]:

2605

2453

logger.warning(

2606

"disabling client {} - Client never "

2454

"disabling client {0} - Client never "

2607

2455

"performed a successful checker"

2608

2456

.format(client_name))

2609

2457

client["enabled"] = False

2610

2458

elif client["last_checker_status"] != 0:

2611

2459

logger.warning(

2612

"disabling client {} - Client last"

2613

" checker failed with error code {}"

2460

"disabling client {0} - Client "

2461

"last checker failed with error code {1}"

2614

2462

.format(client_name,

2615

2463

client["last_checker_status"]))

2616

2464

client["enabled"] = False

2619

2467

.utcnow()

2620

2468

+ client["timeout"])

2621

2469

logger.debug("Last checker succeeded,"

2622

" keeping {} enabled"

2470

" keeping {0} enabled"

2623

2471

.format(client_name))

2624

2472

try:

2625

2473

client["secret"] = (

2628

2476

["secret"]))

2629

2477

except PGPError:

2630

2478

# If decryption fails, we use secret from new settings

2631

logger.debug("Failed to decrypt {} old secret"

2479

logger.debug("Failed to decrypt {0} old secret"

2632

2480

.format(client_name))

2633

2481

client["secret"] = (

2634

2482

client_settings[client_name]["secret"])

2642

2490

clients_data[client_name] = client_settings[client_name]

2643

2491

2644

2492

# Create all client objects

2645

for client_name, client in clients_data.items():

2493

for client_name, client in clients_data.iteritems():

2646

2494

tcp_server.clients[client_name] = client_class(

2647

name = client_name, settings = client,

2648

server_settings = server_settings)

2495

name = client_name, settings = client)

2649

2496

2650

2497

if not tcp_server.clients:

2651

2498

logger.warning("No clients defined")

2652

2499

2653

if not foreground:

2654

if pidfile is not None:

2655

try:

2656

with pidfile:

2657

pid = os.getpid()

2658

pidfile.write("{}\n".format(pid).encode("utf-8"))

2659

except IOError:

2660

logger.error("Could not write to file %r with PID %d",

2661

pidfilename, pid)

2662

del pidfile

2500

if not debug:

2501

try:

2502

with pidfile:

2503

pid = os.getpid()

2504

pidfile.write(str(pid) + "\n".encode("utf-8"))

2505

del pidfile

2506

except IOError:

2507

logger.error("Could not write to file %r with PID %d",

2508

pidfilename, pid)

2509

except NameError:

2510

# "pidfile" was never created

2511

pass

2663

2512

del pidfilename

2664

2513

2665

2514

signal.signal(signal.SIGHUP, lambda signum, frame: sys.exit())

2731

2580

2732

2581

def cleanup():

2733

2582

"Cleanup function; run on exit"

2734

if zeroconf:

2735

service.cleanup()

2583

service.cleanup()

2736

2584

2737

2585

multiprocessing.active_children()

2738

wnull.close()

2739

2586

if not (tcp_server.clients or client_settings):

2740

2587

return

2741

2588

2752

2599

2753

2600

# A list of attributes that can not be pickled

2754

2601

# + secret.

2755

exclude = { "bus", "changedstate", "secret",

2756

"checker", "server_settings" }

2602

exclude = set(("bus", "changedstate", "secret",

2603

"checker"))

2757

2604

for name, typ in (inspect.getmembers

2758

2605

(dbus.service.Object)):

2759

2606

exclude.add(name)

2782

2629

except NameError:

2783

2630

pass

2784

2631

if e.errno in (errno.ENOENT, errno.EACCES, errno.EEXIST):

2785

logger.warning("Could not save persistent state: {}"

2632

logger.warning("Could not save persistent state: {0}"

2786

2633

.format(os.strerror(e.errno)))

2787

2634

else:

2788

2635

logger.warning("Could not save persistent state:",

2789

2636

exc_info=e)

2790

raise

2637

raise e

2791

2638

2792

2639

# Delete all clients, and settings from config

2793

2640

while tcp_server.clients:

2817

2664

tcp_server.server_activate()

2818

2665

2819

2666

# Find out what port we got

2820

if zeroconf:

2821

service.port = tcp_server.socket.getsockname()[1]

2667

service.port = tcp_server.socket.getsockname()[1]

2822

2668

if use_ipv6:

2823

2669

logger.info("Now listening on address %r, port %d,"

2824

2670

" flowinfo %d, scope_id %d",

2830

2676

#service.interface = tcp_server.socket.getsockname()[3]

2831

2677

2832

2678

try:

2833

if zeroconf:

2834

# From the Avahi example code

2835

try:

2836

service.activate()

2837

except dbus.exceptions.DBusException as error:

2838

logger.critical("D-Bus Exception", exc_info=error)

2839

cleanup()

2840

sys.exit(1)

2841

# End of Avahi example code

2679

# From the Avahi example code

2680

try:

2681

service.activate()

2682

except dbus.exceptions.DBusException as error:

2683

logger.critical("D-Bus Exception", exc_info=error)

2684

cleanup()

2685

sys.exit(1)

2686

# End of Avahi example code

2842

2687

2843

2688

gobject.io_add_watch(tcp_server.fileno(), gobject.IO_IN,

2844

2689

lambda *args, **kwargs: