mirror of
https://github.com/correl/SleekXMPP.git
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deb52ad350
Note that using % in a string will _always_ perform the sting substitutions, because the strings are constructed before the function is called. So log.debug('%s' % expensiveoperation()) will take about the same CPU time whether or not the logging level is DEBUG or INFO. if you use , no substitutions are performed unless the string is actually logged
1373 lines
52 KiB
Python
1373 lines
52 KiB
Python
"""
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SleekXMPP: The Sleek XMPP Library
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Copyright (C) 2010 Nathanael C. Fritz
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This file is part of SleekXMPP.
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See the file LICENSE for copying permission.
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"""
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from __future__ import with_statement, unicode_literals
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import base64
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import copy
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import logging
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import signal
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import socket as Socket
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import ssl
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import sys
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import threading
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import time
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import types
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import random
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import weakref
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try:
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import queue
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except ImportError:
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import Queue as queue
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import sleekxmpp
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from sleekxmpp.thirdparty.statemachine import StateMachine
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from sleekxmpp.xmlstream import Scheduler, tostring
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from sleekxmpp.xmlstream.stanzabase import StanzaBase, ET
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from sleekxmpp.xmlstream.handler import Waiter, XMLCallback
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from sleekxmpp.xmlstream.matcher import MatchXMLMask
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# In Python 2.x, file socket objects are broken. A patched socket
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# wrapper is provided for this case in filesocket.py.
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if sys.version_info < (3, 0):
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from sleekxmpp.xmlstream.filesocket import FileSocket, Socket26
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try:
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import dns.resolver
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except ImportError:
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DNSPYTHON = False
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else:
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DNSPYTHON = True
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# The time in seconds to wait before timing out waiting for response stanzas.
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RESPONSE_TIMEOUT = 30
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# The time in seconds to wait for events from the event queue, and also the
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# time between checks for the process stop signal.
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WAIT_TIMEOUT = 1
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# The number of threads to use to handle XML stream events. This is not the
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# same as the number of custom event handling threads. HANDLER_THREADS must
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# be at least 1.
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HANDLER_THREADS = 1
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# Flag indicating if the SSL library is available for use.
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SSL_SUPPORT = True
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# Maximum time to delay between connection attempts is one hour.
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RECONNECT_MAX_DELAY = 600
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log = logging.getLogger(__name__)
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class RestartStream(Exception):
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"""
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Exception to restart stream processing, including
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resending the stream header.
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"""
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class XMLStream(object):
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"""
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An XML stream connection manager and event dispatcher.
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The XMLStream class abstracts away the issues of establishing a
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connection with a server and sending and receiving XML "stanzas".
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A stanza is a complete XML element that is a direct child of a root
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document element. Two streams are used, one for each communication
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direction, over the same socket. Once the connection is closed, both
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streams should be complete and valid XML documents.
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Three types of events are provided to manage the stream:
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Stream -- Triggered based on received stanzas, similar in concept
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to events in a SAX XML parser.
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Custom -- Triggered manually.
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Scheduled -- Triggered based on time delays.
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Typically, stanzas are first processed by a stream event handler which
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will then trigger custom events to continue further processing,
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especially since custom event handlers may run in individual threads.
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Attributes:
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address -- The hostname and port of the server.
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default_ns -- The default XML namespace that will be applied
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to all non-namespaced stanzas.
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event_queue -- A queue of stream, custom, and scheduled
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events to be processed.
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filesocket -- A filesocket created from the main connection socket.
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Required for ElementTree.iterparse.
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default_port -- Default port to connect to.
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namespace_map -- Optional mapping of namespaces to namespace prefixes.
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scheduler -- A scheduler object for triggering events
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after a given period of time.
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send_queue -- A queue of stanzas to be sent on the stream.
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socket -- The connection to the server.
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ssl_support -- Indicates if a SSL library is available for use.
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ssl_version -- The version of the SSL protocol to use.
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Defaults to ssl.PROTOCOL_TLSv1.
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ca_certs -- File path to a CA certificate to verify the
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server's identity.
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state -- A state machine for managing the stream's
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connection state.
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stream_footer -- The start tag and any attributes for the stream's
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root element.
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stream_header -- The closing tag of the stream's root element.
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use_ssl -- Flag indicating if SSL should be used.
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use_tls -- Flag indicating if TLS should be used.
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use_proxy -- Flag indicating that an HTTP Proxy should be used.
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stop -- threading Event used to stop all threads.
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proxy_config -- An optional dictionary with the following entries:
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host -- The host offering proxy services.
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port -- The port for the proxy service.
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username -- Optional username for the proxy.
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password -- Optional password for the proxy.
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auto_reconnect -- Flag to determine whether we auto reconnect.
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reconnect_max_delay -- Maximum time to delay between connection
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attempts. Defaults to RECONNECT_MAX_DELAY,
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which is one hour.
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dns_answers -- List of dns answers not yet used to connect.
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Methods:
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add_event_handler -- Add a handler for a custom event.
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add_handler -- Shortcut method for registerHandler.
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connect -- Connect to the given server.
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del_event_handler -- Remove a handler for a custom event.
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disconnect -- Disconnect from the server and terminate
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processing.
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event -- Trigger a custom event.
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get_id -- Return the current stream ID.
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incoming_filter -- Optionally filter stanzas before processing.
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new_id -- Generate a new, unique ID value.
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process -- Read XML stanzas from the stream and apply
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matching stream handlers.
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reconnect -- Reestablish a connection to the server.
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register_handler -- Add a handler for a stream event.
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register_stanza -- Add a new stanza object type that may appear
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as a direct child of the stream's root.
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remove_handler -- Remove a stream handler.
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remove_stanza -- Remove a stanza object type.
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schedule -- Schedule an event handler to execute after a
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given delay.
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send -- Send a stanza object on the stream.
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send_raw -- Send a raw string on the stream.
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send_xml -- Send an XML string on the stream.
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set_socket -- Set the stream's socket and generate a new
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filesocket.
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start_stream_handler -- Perform any stream initialization such
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as handshakes.
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start_tls -- Establish a TLS connection and restart
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the stream.
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"""
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def __init__(self, socket=None, host='', port=0):
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"""
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Establish a new XML stream.
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Arguments:
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socket -- Use an existing socket for the stream.
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Defaults to None to generate a new socket.
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host -- The name of the target server.
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Defaults to the empty string.
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port -- The port to use for the connection.
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Defaults to 0.
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"""
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self.ssl_support = SSL_SUPPORT
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self.ssl_version = ssl.PROTOCOL_TLSv1
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self.ca_certs = None
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self.wait_timeout = WAIT_TIMEOUT
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self.response_timeout = RESPONSE_TIMEOUT
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self.reconnect_delay = None
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self.reconnect_max_delay = RECONNECT_MAX_DELAY
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self.state = StateMachine(('disconnected', 'connected'))
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self.state._set_state('disconnected')
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self.default_port = int(port)
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self.default_domain = ''
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self.address = (host, int(port))
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self.filesocket = None
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self.set_socket(socket)
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if sys.version_info < (3, 0):
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self.socket_class = Socket26
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else:
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self.socket_class = Socket.socket
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self.use_ssl = False
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self.use_tls = False
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self.use_proxy = False
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self.proxy_config = {}
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self.default_ns = ''
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self.stream_ns = ''
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self.stream_header = "<stream>"
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self.stream_footer = "</stream>"
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self.whitespace_keepalive = True
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self.whitespace_keepalive_interval = 300
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self.stop = threading.Event()
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self.stream_end_event = threading.Event()
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self.stream_end_event.set()
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self.session_started_event = threading.Event()
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self.session_timeout = 45
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self.event_queue = queue.Queue()
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self.send_queue = queue.Queue()
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self.__failed_send_stanza = None
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self.scheduler = Scheduler(self.stop)
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self.namespace_map = {StanzaBase.xml_ns: 'xml'}
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self.__thread = {}
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self.__root_stanza = []
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self.__handlers = []
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self.__event_handlers = {}
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self.__event_handlers_lock = threading.Lock()
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self._id = 0
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self._id_lock = threading.Lock()
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self.auto_reconnect = True
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self.dns_answers = []
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self.add_event_handler('connected', self._handle_connected)
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self.add_event_handler('session_start', self._start_keepalive)
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self.add_event_handler('session_end', self._end_keepalive)
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def use_signals(self, signals=None):
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"""
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Register signal handlers for SIGHUP and SIGTERM, if possible,
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which will raise a "killed" event when the application is
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terminated.
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If a signal handler already existed, it will be executed first,
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before the "killed" event is raised.
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Arguments:
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signals -- A list of signal names to be monitored.
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Defaults to ['SIGHUP', 'SIGTERM'].
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"""
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if signals is None:
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signals = ['SIGHUP', 'SIGTERM']
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existing_handlers = {}
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for sig_name in signals:
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if hasattr(signal, sig_name):
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sig = getattr(signal, sig_name)
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handler = signal.getsignal(sig)
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if handler:
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existing_handlers[sig] = handler
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def handle_kill(signum, frame):
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"""
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Capture kill event and disconnect cleanly after first
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spawning the "killed" event.
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"""
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if signum in existing_handlers and \
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existing_handlers[signum] != handle_kill:
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existing_handlers[signum](signum, frame)
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self.event("killed", direct=True)
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self.disconnect()
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try:
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for sig_name in signals:
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if hasattr(signal, sig_name):
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sig = getattr(signal, sig_name)
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signal.signal(sig, handle_kill)
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self.__signals_installed = True
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except:
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log.debug("Can not set interrupt signal handlers. " + \
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"SleekXMPP is not running from a main thread.")
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def new_id(self):
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"""
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Generate and return a new stream ID in hexadecimal form.
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Many stanzas, handlers, or matchers may require unique
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ID values. Using this method ensures that all new ID values
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are unique in this stream.
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"""
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with self._id_lock:
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self._id += 1
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return self.get_id()
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def get_id(self):
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"""
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Return the current unique stream ID in hexadecimal form.
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"""
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return "%X" % self._id
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def connect(self, host='', port=0, use_ssl=False,
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use_tls=True, reattempt=True):
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"""
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Create a new socket and connect to the server.
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Setting reattempt to True will cause connection attempts to be made
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every second until a successful connection is established.
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Arguments:
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host -- The name of the desired server for the connection.
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port -- Port to connect to on the server.
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use_ssl -- Flag indicating if SSL should be used.
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use_tls -- Flag indicating if TLS should be used.
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reattempt -- Flag indicating if the socket should reconnect
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after disconnections.
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"""
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if host and port:
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self.address = (host, int(port))
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try:
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Socket.inet_aton(self.address[0])
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except Socket.error:
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self.default_domain = self.address[0]
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# Respect previous SSL and TLS usage directives.
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if use_ssl is not None:
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self.use_ssl = use_ssl
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if use_tls is not None:
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self.use_tls = use_tls
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# Repeatedly attempt to connect until a successful connection
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# is established.
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connected = self.state.transition('disconnected', 'connected',
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func=self._connect)
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while reattempt and not connected:
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connected = self.state.transition('disconnected', 'connected',
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func=self._connect)
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return connected
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def _connect(self):
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self.scheduler.remove('Session timeout check')
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self.stop.clear()
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if self.default_domain:
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self.address = self.pick_dns_answer(self.default_domain,
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self.address[1])
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self.socket = self.socket_class(Socket.AF_INET, Socket.SOCK_STREAM)
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self.configure_socket()
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if self.reconnect_delay is None:
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delay = 1.0
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else:
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delay = min(self.reconnect_delay * 2, self.reconnect_max_delay)
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delay = random.normalvariate(delay, delay * 0.1)
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log.debug('Waiting %s seconds before connecting.' , delay)
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time.sleep(delay)
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if self.use_proxy:
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connected = self._connect_proxy()
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if not connected:
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self.reconnect_delay = delay
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return False
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|
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if self.use_ssl and self.ssl_support:
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log.debug("Socket Wrapped for SSL")
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if self.ca_certs is None:
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cert_policy = ssl.CERT_NONE
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else:
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cert_policy = ssl.CERT_REQUIRED
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|
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ssl_socket = ssl.wrap_socket(self.socket,
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ca_certs=self.ca_certs,
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cert_reqs=cert_policy)
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|
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if hasattr(self.socket, 'socket'):
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# We are using a testing socket, so preserve the top
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# layer of wrapping.
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self.socket.socket = ssl_socket
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else:
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self.socket = ssl_socket
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|
|
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try:
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if not self.use_proxy:
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log.debug("Connecting to %s:%s" , self.address)
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self.socket.connect(self.address)
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self.set_socket(self.socket, ignore=True)
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#this event is where you should set your application state
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self.event("connected", direct=True)
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self.reconnect_delay = 1.0
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return True
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except Socket.error as serr:
|
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error_msg = "Could not connect to %s:%s. Socket Error #%s: %s"
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|
self.event('socket_error', serr)
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log.error(error_msg % (self.address[0], self.address[1],
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serr.errno, serr.strerror))
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self.reconnect_delay = delay
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return False
|
|
|
|
def _connect_proxy(self):
|
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"""Attempt to connect using an HTTP Proxy."""
|
|
|
|
# Extract the proxy address, and optional credentials
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|
address = (self.proxy_config['host'], int(self.proxy_config['port']))
|
|
cred = None
|
|
if self.proxy_config['username']:
|
|
username = self.proxy_config['username']
|
|
password = self.proxy_config['password']
|
|
|
|
cred = '%s:%s' % (username, password)
|
|
if sys.version_info < (3, 0):
|
|
cred = bytes(cred)
|
|
else:
|
|
cred = bytes(cred, 'utf-8')
|
|
cred = base64.b64encode(cred).decode('utf-8')
|
|
|
|
# Build the HTTP headers for connecting to the XMPP server
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headers = ['CONNECT %s:%s HTTP/1.0' % self.address,
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'Host: %s:%s' % self.address,
|
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'Proxy-Connection: Keep-Alive',
|
|
'Pragma: no-cache',
|
|
'User-Agent: SleekXMPP/%s' % sleekxmpp.__version__]
|
|
if cred:
|
|
headers.append('Proxy-Authorization: Basic %s' % cred)
|
|
headers = '\r\n'.join(headers) + '\r\n\r\n'
|
|
|
|
try:
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|
log.debug("Connecting to proxy: %s:%s" , address)
|
|
self.socket.connect(address)
|
|
self.send_raw(headers, now=True)
|
|
resp = ''
|
|
while '\r\n\r\n' not in resp:
|
|
resp += self.socket.recv(1024).decode('utf-8')
|
|
log.debug('RECV: %s' , resp)
|
|
|
|
lines = resp.split('\r\n')
|
|
if '200' not in lines[0]:
|
|
self.event('proxy_error', resp)
|
|
log.error('Proxy Error: %s' , lines[0])
|
|
return False
|
|
|
|
# Proxy connection established, continue connecting
|
|
# with the XMPP server.
|
|
return True
|
|
except Socket.error as serr:
|
|
error_msg = "Could not connect to %s:%s. Socket Error #%s: %s"
|
|
self.event('socket_error', serr)
|
|
log.error(error_msg % (self.address[0], self.address[1],
|
|
serr.errno, serr.strerror))
|
|
return False
|
|
|
|
def _handle_connected(self, event=None):
|
|
"""
|
|
Add check to ensure that a session is established within
|
|
a reasonable amount of time.
|
|
"""
|
|
|
|
def _handle_session_timeout():
|
|
if not self.session_started_event.isSet():
|
|
log.debug("Session start has taken more " + \
|
|
"than %d seconds" % self.session_timeout)
|
|
self.disconnect(reconnect=self.auto_reconnect)
|
|
|
|
self.schedule("Session timeout check",
|
|
self.session_timeout,
|
|
_handle_session_timeout)
|
|
|
|
|
|
def disconnect(self, reconnect=False, wait=False):
|
|
"""
|
|
Terminate processing and close the XML streams.
|
|
|
|
Optionally, the connection may be reconnected and
|
|
resume processing afterwards.
|
|
|
|
If the disconnect should take place after all items
|
|
in the send queue have been sent, use wait=True. However,
|
|
take note: If you are constantly adding items to the queue
|
|
such that it is never empty, then the disconnect will
|
|
not occur and the call will continue to block.
|
|
|
|
Arguments:
|
|
reconnect -- Flag indicating if the connection
|
|
and processing should be restarted.
|
|
Defaults to False.
|
|
wait -- Flag indicating if the send queue should
|
|
be emptied before disconnecting.
|
|
"""
|
|
self.state.transition('connected', 'disconnected', wait=0.0,
|
|
func=self._disconnect, args=(reconnect, wait))
|
|
|
|
def _disconnect(self, reconnect=False, wait=False):
|
|
# Wait for the send queue to empty.
|
|
if wait:
|
|
self.send_queue.join()
|
|
|
|
# Send the end of stream marker.
|
|
self.send_raw(self.stream_footer, now=True)
|
|
self.session_started_event.clear()
|
|
# Wait for confirmation that the stream was
|
|
# closed in the other direction.
|
|
self.auto_reconnect = reconnect
|
|
log.debug('Waiting for %s from server' , self.stream_footer)
|
|
self.stream_end_event.wait(4)
|
|
if not self.auto_reconnect:
|
|
self.stop.set()
|
|
try:
|
|
self.socket.shutdown(Socket.SHUT_RDWR)
|
|
self.socket.close()
|
|
self.filesocket.close()
|
|
except Socket.error as serr:
|
|
self.event('socket_error', serr)
|
|
finally:
|
|
#clear your application state
|
|
self.event('session_end', direct=True)
|
|
self.event("disconnected", direct=True)
|
|
return True
|
|
|
|
def reconnect(self):
|
|
"""
|
|
Reset the stream's state and reconnect to the server.
|
|
"""
|
|
log.debug("reconnecting...")
|
|
self.state.transition('connected', 'disconnected', wait=2.0,
|
|
func=self._disconnect, args=(True,))
|
|
|
|
log.debug("connecting...")
|
|
connected = self.state.transition('disconnected', 'connected',
|
|
wait=2.0, func=self._connect)
|
|
while not connected:
|
|
connected = self.state.transition('disconnected', 'connected',
|
|
wait=2.0, func=self._connect)
|
|
return connected
|
|
|
|
def set_socket(self, socket, ignore=False):
|
|
"""
|
|
Set the socket to use for the stream.
|
|
|
|
The filesocket will be recreated as well.
|
|
|
|
Arguments:
|
|
socket -- The new socket to use.
|
|
ignore -- don't set the state
|
|
"""
|
|
self.socket = socket
|
|
if socket is not None:
|
|
# ElementTree.iterparse requires a file.
|
|
# 0 buffer files have to be binary.
|
|
|
|
# Use the correct fileobject type based on the Python
|
|
# version to work around a broken implementation in
|
|
# Python 2.x.
|
|
if sys.version_info < (3, 0):
|
|
self.filesocket = FileSocket(self.socket)
|
|
else:
|
|
self.filesocket = self.socket.makefile('rb', 0)
|
|
if not ignore:
|
|
self.state._set_state('connected')
|
|
|
|
def configure_socket(self):
|
|
"""
|
|
Set timeout and other options for self.socket.
|
|
|
|
Meant to be overridden.
|
|
"""
|
|
self.socket.settimeout(None)
|
|
|
|
def configure_dns(self, resolver, domain=None, port=None):
|
|
"""
|
|
Configure and set options for a dns.resolver.Resolver
|
|
instance, and other DNS related tasks. For example, you
|
|
can also check Socket.getaddrinfo to see if you need to
|
|
call out to libresolv.so.2 to run res_init().
|
|
|
|
Meant to be overridden.
|
|
|
|
Arguments:
|
|
resolver -- A dns.resolver.Resolver instance, or None
|
|
if dnspython is not installed.
|
|
domain -- The initial domain under consideration.
|
|
port -- The initial port under consideration.
|
|
"""
|
|
pass
|
|
|
|
def start_tls(self):
|
|
"""
|
|
Perform handshakes for TLS.
|
|
|
|
If the handshake is successful, the XML stream will need
|
|
to be restarted.
|
|
"""
|
|
if self.ssl_support:
|
|
log.info("Negotiating TLS")
|
|
log.info("Using SSL version: %s" , str(self.ssl_version))
|
|
if self.ca_certs is None:
|
|
cert_policy = ssl.CERT_NONE
|
|
else:
|
|
cert_policy = ssl.CERT_REQUIRED
|
|
|
|
ssl_socket = ssl.wrap_socket(self.socket,
|
|
ssl_version=self.ssl_version,
|
|
do_handshake_on_connect=False,
|
|
ca_certs=self.ca_certs,
|
|
cert_reqs=cert_policy)
|
|
|
|
if hasattr(self.socket, 'socket'):
|
|
# We are using a testing socket, so preserve the top
|
|
# layer of wrapping.
|
|
self.socket.socket = ssl_socket
|
|
else:
|
|
self.socket = ssl_socket
|
|
self.socket.do_handshake()
|
|
self.set_socket(self.socket)
|
|
return True
|
|
else:
|
|
log.warning("Tried to enable TLS, but ssl module not found.")
|
|
return False
|
|
|
|
def _start_keepalive(self, event):
|
|
"""
|
|
Begin sending whitespace periodically to keep the connection alive.
|
|
|
|
May be disabled by setting:
|
|
self.whitespace_keepalive = False
|
|
|
|
The keepalive interval can be set using:
|
|
self.whitespace_keepalive_interval = 300
|
|
"""
|
|
|
|
def send_keepalive():
|
|
if self.send_queue.empty():
|
|
self.send_raw(' ')
|
|
|
|
self.schedule('Whitespace Keepalive',
|
|
self.whitespace_keepalive_interval,
|
|
send_keepalive,
|
|
repeat=True)
|
|
|
|
def _end_keepalive(self, event):
|
|
"""Stop sending whitespace keepalives"""
|
|
self.scheduler.remove('Whitespace Keepalive')
|
|
|
|
def start_stream_handler(self, xml):
|
|
"""
|
|
Perform any initialization actions, such as handshakes, once the
|
|
stream header has been sent.
|
|
|
|
Meant to be overridden.
|
|
"""
|
|
pass
|
|
|
|
def register_stanza(self, stanza_class):
|
|
"""
|
|
Add a stanza object class as a known root stanza. A root stanza is
|
|
one that appears as a direct child of the stream's root element.
|
|
|
|
Stanzas that appear as substanzas of a root stanza do not need to
|
|
be registered here. That is done using register_stanza_plugin() from
|
|
sleekxmpp.xmlstream.stanzabase.
|
|
|
|
Stanzas that are not registered will not be converted into
|
|
stanza objects, but may still be processed using handlers and
|
|
matchers.
|
|
|
|
Arguments:
|
|
stanza_class -- The top-level stanza object's class.
|
|
"""
|
|
self.__root_stanza.append(stanza_class)
|
|
|
|
def remove_stanza(self, stanza_class):
|
|
"""
|
|
Remove a stanza from being a known root stanza. A root stanza is
|
|
one that appears as a direct child of the stream's root element.
|
|
|
|
Stanzas that are not registered will not be converted into
|
|
stanza objects, but may still be processed using handlers and
|
|
matchers.
|
|
"""
|
|
del self.__root_stanza[stanza_class]
|
|
|
|
def add_handler(self, mask, pointer, name=None, disposable=False,
|
|
threaded=False, filter=False, instream=False):
|
|
"""
|
|
A shortcut method for registering a handler using XML masks.
|
|
|
|
Arguments:
|
|
mask -- An XML snippet matching the structure of the
|
|
stanzas that will be passed to this handler.
|
|
pointer -- The handler function itself.
|
|
name -- A unique name for the handler. A name will
|
|
be generated if one is not provided.
|
|
disposable -- Indicates if the handler should be discarded
|
|
after one use.
|
|
threaded -- Deprecated. Remains for backwards compatibility.
|
|
filter -- Deprecated. Remains for backwards compatibility.
|
|
instream -- Indicates if the handler should execute during
|
|
stream processing and not during normal event
|
|
processing.
|
|
"""
|
|
# To prevent circular dependencies, we must load the matcher
|
|
# and handler classes here.
|
|
|
|
if name is None:
|
|
name = 'add_handler_%s' % self.getNewId()
|
|
self.registerHandler(XMLCallback(name, MatchXMLMask(mask), pointer,
|
|
once=disposable, instream=instream))
|
|
|
|
def register_handler(self, handler, before=None, after=None):
|
|
"""
|
|
Add a stream event handler that will be executed when a matching
|
|
stanza is received.
|
|
|
|
Arguments:
|
|
handler -- The handler object to execute.
|
|
"""
|
|
if handler.stream is None:
|
|
self.__handlers.append(handler)
|
|
handler.stream = weakref.ref(self)
|
|
|
|
def remove_handler(self, name):
|
|
"""
|
|
Remove any stream event handlers with the given name.
|
|
|
|
Arguments:
|
|
name -- The name of the handler.
|
|
"""
|
|
idx = 0
|
|
for handler in self.__handlers:
|
|
if handler.name == name:
|
|
self.__handlers.pop(idx)
|
|
return True
|
|
idx += 1
|
|
return False
|
|
|
|
def get_dns_records(self, domain, port=None):
|
|
"""
|
|
Get the DNS records for a domain.
|
|
|
|
Arguments:
|
|
domain -- The domain in question.
|
|
port -- If the results don't include a port, use this one.
|
|
"""
|
|
if port is None:
|
|
port = self.default_port
|
|
if DNSPYTHON:
|
|
resolver = dns.resolver.get_default_resolver()
|
|
self.configure_dns(resolver, domain=domain, port=port)
|
|
|
|
try:
|
|
answers = resolver.query(domain, dns.rdatatype.A)
|
|
except (dns.resolver.NXDOMAIN, dns.resolver.NoAnswer):
|
|
log.warning("No A records for %s" , domain)
|
|
return [((domain, port), 0, 0)]
|
|
except dns.exception.Timeout:
|
|
log.warning("DNS resolution timed out " + \
|
|
"for A record of %s" % domain)
|
|
return [((domain, port), 0, 0)]
|
|
else:
|
|
return [((ans.address, port), 0, 0) for ans in answers]
|
|
else:
|
|
log.warning("dnspython is not installed -- " + \
|
|
"relying on OS A record resolution")
|
|
self.configure_dns(None, domain=domain, port=port)
|
|
return [((domain, port), 0, 0)]
|
|
|
|
def pick_dns_answer(self, domain, port=None):
|
|
"""
|
|
Pick a server and port from DNS answers.
|
|
Gets DNS answers if none available.
|
|
Removes used answer from available answers.
|
|
|
|
Arguments:
|
|
domain -- The domain in question.
|
|
port -- If the results don't include a port, use this one.
|
|
"""
|
|
if not self.dns_answers:
|
|
self.dns_answers = self.get_dns_records(domain, port)
|
|
addresses = {}
|
|
intmax = 0
|
|
topprio = 65535
|
|
for answer in self.dns_answers:
|
|
topprio = min(topprio, answer[1])
|
|
for answer in self.dns_answers:
|
|
if answer[1] == topprio:
|
|
intmax += answer[2]
|
|
addresses[intmax] = answer[0]
|
|
|
|
#python3 returns a generator for dictionary keys
|
|
items = [x for x in addresses.keys()]
|
|
items.sort()
|
|
|
|
picked = random.randint(0, intmax)
|
|
for item in items:
|
|
if picked <= item:
|
|
address = addresses[item]
|
|
break
|
|
for idx, answer in enumerate(self.dns_answers):
|
|
if self.dns_answers[0] == address:
|
|
break
|
|
self.dns_answers.pop(idx)
|
|
log.debug("Trying to connect to %s:%s" , address)
|
|
return address
|
|
|
|
def add_event_handler(self, name, pointer,
|
|
threaded=False, disposable=False):
|
|
"""
|
|
Add a custom event handler that will be executed whenever
|
|
its event is manually triggered.
|
|
|
|
Arguments:
|
|
name -- The name of the event that will trigger
|
|
this handler.
|
|
pointer -- The function to execute.
|
|
threaded -- If set to True, the handler will execute
|
|
in its own thread. Defaults to False.
|
|
disposable -- If set to True, the handler will be
|
|
discarded after one use. Defaults to False.
|
|
"""
|
|
if not name in self.__event_handlers:
|
|
self.__event_handlers[name] = []
|
|
self.__event_handlers[name].append((pointer, threaded, disposable))
|
|
|
|
def del_event_handler(self, name, pointer):
|
|
"""
|
|
Remove a function as a handler for an event.
|
|
|
|
Arguments:
|
|
name -- The name of the event.
|
|
pointer -- The function to remove as a handler.
|
|
"""
|
|
if not name in self.__event_handlers:
|
|
return
|
|
|
|
# Need to keep handlers that do not use
|
|
# the given function pointer
|
|
def filter_pointers(handler):
|
|
return handler[0] != pointer
|
|
|
|
self.__event_handlers[name] = list(filter(
|
|
filter_pointers,
|
|
self.__event_handlers[name]))
|
|
|
|
def event_handled(self, name):
|
|
"""
|
|
Indicates if an event has any associated handlers.
|
|
|
|
Returns the number of registered handlers.
|
|
|
|
Arguments:
|
|
name -- The name of the event to check.
|
|
"""
|
|
return len(self.__event_handlers.get(name, []))
|
|
|
|
def event(self, name, data={}, direct=False):
|
|
"""
|
|
Manually trigger a custom event.
|
|
|
|
Arguments:
|
|
name -- The name of the event to trigger.
|
|
data -- Data that will be passed to each event handler.
|
|
Defaults to an empty dictionary.
|
|
direct -- Runs the event directly if True, skipping the
|
|
event queue. All event handlers will run in the
|
|
same thread.
|
|
"""
|
|
for handler in self.__event_handlers.get(name, []):
|
|
if direct:
|
|
try:
|
|
handler[0](copy.copy(data))
|
|
except Exception as e:
|
|
error_msg = 'Error processing event handler: %s'
|
|
log.exception(error_msg , str(handler[0]))
|
|
if hasattr(data, 'exception'):
|
|
data.exception(e)
|
|
else:
|
|
self.exception(e)
|
|
else:
|
|
self.event_queue.put(('event', handler, copy.copy(data)))
|
|
|
|
if handler[2]:
|
|
# If the handler is disposable, we will go ahead and
|
|
# remove it now instead of waiting for it to be
|
|
# processed in the queue.
|
|
with self.__event_handlers_lock:
|
|
try:
|
|
h_index = self.__event_handlers[name].index(handler)
|
|
self.__event_handlers[name].pop(h_index)
|
|
except:
|
|
pass
|
|
|
|
def schedule(self, name, seconds, callback, args=None,
|
|
kwargs=None, repeat=False):
|
|
"""
|
|
Schedule a callback function to execute after a given delay.
|
|
|
|
Arguments:
|
|
name -- A unique name for the scheduled callback.
|
|
seconds -- The time in seconds to wait before executing.
|
|
callback -- A pointer to the function to execute.
|
|
args -- A tuple of arguments to pass to the function.
|
|
kwargs -- A dictionary of keyword arguments to pass to
|
|
the function.
|
|
repeat -- Flag indicating if the scheduled event should
|
|
be reset and repeat after executing.
|
|
"""
|
|
self.scheduler.add(name, seconds, callback, args, kwargs,
|
|
repeat, qpointer=self.event_queue)
|
|
|
|
def incoming_filter(self, xml):
|
|
"""
|
|
Filter incoming XML objects before they are processed.
|
|
|
|
Possible uses include remapping namespaces, or correcting elements
|
|
from sources with incorrect behavior.
|
|
|
|
Meant to be overridden.
|
|
"""
|
|
return xml
|
|
|
|
def send(self, data, mask=None, timeout=None, now=False):
|
|
"""
|
|
A wrapper for send_raw for sending stanza objects.
|
|
|
|
May optionally block until an expected response is received.
|
|
|
|
Arguments:
|
|
data -- The stanza object to send on the stream.
|
|
mask -- Deprecated. An XML snippet matching the structure
|
|
of the expected response. Execution will block
|
|
in this thread until the response is received
|
|
or a timeout occurs.
|
|
timeout -- Time in seconds to wait for a response before
|
|
continuing. Defaults to RESPONSE_TIMEOUT.
|
|
now -- Indicates if the send queue should be skipped,
|
|
sending the stanza immediately. Useful mainly
|
|
for stream initialization stanzas.
|
|
Defaults to False.
|
|
"""
|
|
if timeout is None:
|
|
timeout = self.response_timeout
|
|
if hasattr(mask, 'xml'):
|
|
mask = mask.xml
|
|
data = str(data)
|
|
if mask is not None:
|
|
log.warning("Use of send mask waiters is deprecated.")
|
|
wait_for = Waiter("SendWait_%s" % self.new_id(),
|
|
MatchXMLMask(mask))
|
|
self.register_handler(wait_for)
|
|
self.send_raw(data, now)
|
|
if mask is not None:
|
|
return wait_for.wait(timeout)
|
|
|
|
def send_xml(self, data, mask=None, timeout=None, now=False):
|
|
"""
|
|
Send an XML object on the stream, and optionally wait
|
|
for a response.
|
|
|
|
Arguments:
|
|
data -- The XML object to send on the stream.
|
|
mask -- Deprecated. An XML snippet matching the structure
|
|
of the expected response. Execution will block
|
|
in this thread until the response is received
|
|
or a timeout occurs.
|
|
timeout -- Time in seconds to wait for a response before
|
|
continuing. Defaults to RESPONSE_TIMEOUT.
|
|
now -- Indicates if the send queue should be skipped,
|
|
sending the stanza immediately. Useful mainly
|
|
for stream initialization stanzas.
|
|
Defaults to False.
|
|
"""
|
|
if timeout is None:
|
|
timeout = self.response_timeout
|
|
return self.send(tostring(data), mask, timeout, now)
|
|
|
|
def send_raw(self, data, now=False, reconnect=None):
|
|
"""
|
|
Send raw data across the stream.
|
|
|
|
Arguments:
|
|
data -- Any string value.
|
|
reconnect -- Indicates if the stream should be
|
|
restarted if there is an error sending
|
|
the stanza. Used mainly for testing.
|
|
Defaults to self.auto_reconnect.
|
|
"""
|
|
if now:
|
|
log.debug("SEND (IMMED): %s" , data)
|
|
try:
|
|
data = data.encode('utf-8')
|
|
total = len(data)
|
|
sent = 0
|
|
count = 0
|
|
while sent < total and not self.stop.is_set():
|
|
sent += self.socket.send(data[sent:])
|
|
count += 1
|
|
if count > 1:
|
|
log.debug('SENT: %d chunks' , count)
|
|
except Socket.error as serr:
|
|
self.event('socket_error', serr)
|
|
log.warning("Failed to send %s" , data)
|
|
if reconnect is None:
|
|
reconnect = self.auto_reconnect
|
|
self.disconnect(reconnect)
|
|
else:
|
|
self.send_queue.put(data)
|
|
return True
|
|
|
|
def process(self, **kwargs):
|
|
"""
|
|
Initialize the XML streams and begin processing events.
|
|
|
|
The number of threads used for processing stream events is determined
|
|
by HANDLER_THREADS.
|
|
|
|
Arguments:
|
|
block -- If block=False then event dispatcher will run
|
|
in a separate thread, allowing for the stream to be
|
|
used in the background for another application.
|
|
Otherwise, process(block=True) blocks the current thread.
|
|
Defaults to False.
|
|
|
|
**threaded is deprecated and included for API compatibility**
|
|
threaded -- If threaded=True then event dispatcher will run
|
|
in a separate thread, allowing for the stream to be
|
|
used in the background for another application.
|
|
Defaults to True.
|
|
|
|
Event handlers and the send queue will be threaded
|
|
regardless of these parameters.
|
|
"""
|
|
if 'threaded' in kwargs and 'block' in kwargs:
|
|
raise ValueError("process() called with both " + \
|
|
"block and threaded arguments")
|
|
elif 'block' in kwargs:
|
|
threaded = not(kwargs.get('block', False))
|
|
else:
|
|
threaded = kwargs.get('threaded', True)
|
|
|
|
self.scheduler.process(threaded=True)
|
|
|
|
def start_thread(name, target):
|
|
self.__thread[name] = threading.Thread(name=name, target=target)
|
|
self.__thread[name].daemon = True
|
|
self.__thread[name].start()
|
|
|
|
for t in range(0, HANDLER_THREADS):
|
|
log.debug("Starting HANDLER THREAD")
|
|
start_thread('stream_event_handler_%s' % t, self._event_runner)
|
|
|
|
start_thread('send_thread', self._send_thread)
|
|
|
|
if threaded:
|
|
# Run the XML stream in the background for another application.
|
|
start_thread('process', self._process)
|
|
else:
|
|
self._process()
|
|
|
|
def _process(self):
|
|
"""
|
|
Start processing the XML streams.
|
|
|
|
Processing will continue after any recoverable errors
|
|
if reconnections are allowed.
|
|
"""
|
|
|
|
# The body of this loop will only execute once per connection.
|
|
# Additional passes will be made only if an error occurs and
|
|
# reconnecting is permitted.
|
|
while True:
|
|
try:
|
|
# The call to self.__read_xml will block and prevent
|
|
# the body of the loop from running until a disconnect
|
|
# occurs. After any reconnection, the stream header will
|
|
# be resent and processing will resume.
|
|
while not self.stop.is_set():
|
|
# Only process the stream while connected to the server
|
|
if not self.state.ensure('connected', wait=0.1,
|
|
block_on_transition=True):
|
|
continue
|
|
# Ensure the stream header is sent for any
|
|
# new connections.
|
|
if not self.session_started_event.is_set():
|
|
self.send_raw(self.stream_header, now=True)
|
|
if not self.__read_xml():
|
|
# If the server terminated the stream, end processing
|
|
break
|
|
except SyntaxError as e:
|
|
log.error("Error reading from XML stream.")
|
|
self.exception(e)
|
|
except KeyboardInterrupt:
|
|
log.debug("Keyboard Escape Detected in _process")
|
|
self.stop.set()
|
|
except SystemExit:
|
|
log.debug("SystemExit in _process")
|
|
self.stop.set()
|
|
self.scheduler.quit()
|
|
except Socket.error as serr:
|
|
self.event('socket_error', serr)
|
|
log.exception('Socket Error')
|
|
except:
|
|
if not self.stop.is_set():
|
|
log.exception('Connection error.')
|
|
|
|
if not self.stop.is_set() and self.auto_reconnect:
|
|
self.reconnect()
|
|
else:
|
|
self.disconnect()
|
|
break
|
|
|
|
def __read_xml(self):
|
|
"""
|
|
Parse the incoming XML stream, raising stream events for
|
|
each received stanza.
|
|
"""
|
|
depth = 0
|
|
root = None
|
|
for event, xml in ET.iterparse(self.filesocket, (b'end', b'start')):
|
|
if event == b'start':
|
|
if depth == 0:
|
|
# We have received the start of the root element.
|
|
root = xml
|
|
# Perform any stream initialization actions, such
|
|
# as handshakes.
|
|
self.stream_end_event.clear()
|
|
self.start_stream_handler(root)
|
|
depth += 1
|
|
if event == b'end':
|
|
depth -= 1
|
|
if depth == 0:
|
|
# The stream's root element has closed,
|
|
# terminating the stream.
|
|
log.debug("End of stream recieved")
|
|
self.stream_end_event.set()
|
|
return False
|
|
elif depth == 1:
|
|
# We only raise events for stanzas that are direct
|
|
# children of the root element.
|
|
try:
|
|
self.__spawn_event(xml)
|
|
except RestartStream:
|
|
return True
|
|
if root is not None:
|
|
# Keep the root element empty of children to
|
|
# save on memory use.
|
|
root.clear()
|
|
log.debug("Ending read XML loop")
|
|
|
|
def _build_stanza(self, xml, default_ns=None):
|
|
"""
|
|
Create a stanza object from a given XML object.
|
|
|
|
If a specialized stanza type is not found for the XML, then
|
|
a generic StanzaBase stanza will be returned.
|
|
|
|
Arguments:
|
|
xml -- The XML object to convert into a stanza object.
|
|
default_ns -- Optional default namespace to use instead of the
|
|
stream's current default namespace.
|
|
"""
|
|
if default_ns is None:
|
|
default_ns = self.default_ns
|
|
stanza_type = StanzaBase
|
|
for stanza_class in self.__root_stanza:
|
|
if xml.tag == "{%s}%s" % (default_ns, stanza_class.name) or \
|
|
xml.tag == stanza_class.tag_name():
|
|
stanza_type = stanza_class
|
|
break
|
|
stanza = stanza_type(self, xml)
|
|
return stanza
|
|
|
|
def __spawn_event(self, xml):
|
|
"""
|
|
Analyze incoming XML stanzas and convert them into stanza
|
|
objects if applicable and queue stream events to be processed
|
|
by matching handlers.
|
|
|
|
Arguments:
|
|
xml -- The XML stanza to analyze.
|
|
"""
|
|
log.debug("RECV: %s" , tostring(xml,
|
|
xmlns=self.default_ns,
|
|
stream=self))
|
|
# Apply any preprocessing filters.
|
|
xml = self.incoming_filter(xml)
|
|
|
|
# Convert the raw XML object into a stanza object. If no registered
|
|
# stanza type applies, a generic StanzaBase stanza will be used.
|
|
stanza = self._build_stanza(xml)
|
|
|
|
# Match the stanza against registered handlers. Handlers marked
|
|
# to run "in stream" will be executed immediately; the rest will
|
|
# be queued.
|
|
unhandled = True
|
|
for handler in self.__handlers:
|
|
if handler.match(stanza):
|
|
stanza_copy = copy.copy(stanza)
|
|
handler.prerun(stanza_copy)
|
|
self.event_queue.put(('stanza', handler, stanza_copy))
|
|
try:
|
|
if handler.check_delete():
|
|
self.__handlers.remove(handler)
|
|
except:
|
|
pass # not thread safe
|
|
unhandled = False
|
|
|
|
# Some stanzas require responses, such as Iq queries. A default
|
|
# handler will be executed immediately for this case.
|
|
if unhandled:
|
|
stanza.unhandled()
|
|
|
|
def _threaded_event_wrapper(self, func, args):
|
|
"""
|
|
Capture exceptions for event handlers that run
|
|
in individual threads.
|
|
|
|
Arguments:
|
|
func -- The event handler to execute.
|
|
args -- Arguments to the event handler.
|
|
"""
|
|
orig = copy.copy(args[0])
|
|
try:
|
|
func(*args)
|
|
except Exception as e:
|
|
error_msg = 'Error processing event handler: %s'
|
|
log.exception(error_msg , str(func))
|
|
if hasattr(orig, 'exception'):
|
|
orig.exception(e)
|
|
else:
|
|
self.exception(e)
|
|
|
|
def _event_runner(self):
|
|
"""
|
|
Process the event queue and execute handlers.
|
|
|
|
The number of event runner threads is controlled by HANDLER_THREADS.
|
|
|
|
Stream event handlers will all execute in this thread. Custom event
|
|
handlers may be spawned in individual threads.
|
|
"""
|
|
log.debug("Loading event runner")
|
|
try:
|
|
while not self.stop.isSet():
|
|
try:
|
|
wait = self.wait_timeout
|
|
event = self.event_queue.get(True, timeout=wait)
|
|
except queue.Empty:
|
|
event = None
|
|
if event is None:
|
|
continue
|
|
|
|
etype, handler = event[0:2]
|
|
args = event[2:]
|
|
orig = copy.copy(args[0])
|
|
|
|
if etype == 'stanza':
|
|
try:
|
|
handler.run(args[0])
|
|
except Exception as e:
|
|
error_msg = 'Error processing stream handler: %s'
|
|
log.exception(error_msg , handler.name)
|
|
orig.exception(e)
|
|
elif etype == 'schedule':
|
|
name = args[1]
|
|
try:
|
|
log.debug('Scheduled event: %s: %s' , name, args[0])
|
|
handler(*args[0])
|
|
except Exception as e:
|
|
log.exception('Error processing scheduled task')
|
|
self.exception(e)
|
|
elif etype == 'event':
|
|
func, threaded, disposable = handler
|
|
orig = copy.copy(args[0])
|
|
try:
|
|
if threaded:
|
|
x = threading.Thread(
|
|
name="Event_%s" % str(func),
|
|
target=self._threaded_event_wrapper,
|
|
args=(func, args))
|
|
x.start()
|
|
else:
|
|
func(*args)
|
|
except Exception as e:
|
|
error_msg = 'Error processing event handler: %s'
|
|
log.exception(error_msg , str(func))
|
|
if hasattr(orig, 'exception'):
|
|
orig.exception(e)
|
|
else:
|
|
self.exception(e)
|
|
elif etype == 'quit':
|
|
log.debug("Quitting event runner thread")
|
|
return False
|
|
except KeyboardInterrupt:
|
|
log.debug("Keyboard Escape Detected in _event_runner")
|
|
self.event('killed', direct=True)
|
|
self.disconnect()
|
|
return
|
|
except SystemExit:
|
|
self.disconnect()
|
|
self.event_queue.put(('quit', None, None))
|
|
return
|
|
|
|
def _send_thread(self):
|
|
"""
|
|
Extract stanzas from the send queue and send them on the stream.
|
|
"""
|
|
try:
|
|
while not self.stop.is_set():
|
|
self.session_started_event.wait()
|
|
if self.__failed_send_stanza is not None:
|
|
data = self.__failed_send_stanza
|
|
self.__failed_send_stanza = None
|
|
else:
|
|
try:
|
|
data = self.send_queue.get(True, 1)
|
|
except queue.Empty:
|
|
continue
|
|
log.debug("SEND: %s" , data)
|
|
try:
|
|
enc_data = data.encode('utf-8')
|
|
total = len(enc_data)
|
|
sent = 0
|
|
count = 0
|
|
while sent < total and not self.stop.is_set():
|
|
sent += self.socket.send(enc_data[sent:])
|
|
count += 1
|
|
if count > 1:
|
|
log.debug('SENT: %d chunks' , count)
|
|
self.send_queue.task_done()
|
|
except Socket.error as serr:
|
|
self.event('socket_error', serr)
|
|
log.warning("Failed to send %s" , data)
|
|
self.__failed_send_stanza = data
|
|
self.disconnect(self.auto_reconnect)
|
|
except Exception as ex:
|
|
log.exception('Unexpected error in send thread: %s' , ex)
|
|
self.exception(ex)
|
|
if not self.stop.is_set():
|
|
self.disconnect(self.auto_reconnect)
|
|
|
|
def exception(self, exception):
|
|
"""
|
|
Process an unknown exception.
|
|
|
|
Meant to be overridden.
|
|
|
|
Arguments:
|
|
exception -- An unhandled exception object.
|
|
"""
|
|
pass
|
|
|
|
|
|
# To comply with PEP8, method names now use underscores.
|
|
# Deprecated method names are re-mapped for backwards compatibility.
|
|
XMLStream.startTLS = XMLStream.start_tls
|
|
XMLStream.registerStanza = XMLStream.register_stanza
|
|
XMLStream.removeStanza = XMLStream.remove_stanza
|
|
XMLStream.registerHandler = XMLStream.register_handler
|
|
XMLStream.removeHandler = XMLStream.remove_handler
|
|
XMLStream.setSocket = XMLStream.set_socket
|
|
XMLStream.sendRaw = XMLStream.send_raw
|
|
XMLStream.getId = XMLStream.get_id
|
|
XMLStream.getNewId = XMLStream.new_id
|
|
XMLStream.sendXML = XMLStream.send_xml
|