mirror of
https://github.com/jlu5/PyLink.git
synced 2024-11-01 01:09:22 +01:00
416 lines
16 KiB
Python
416 lines
16 KiB
Python
import threading
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from random import randint
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import time
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import socket
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import threading
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import ssl
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from collections import defaultdict
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import hashlib
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from log import log
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from conf import conf
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import world
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### Exceptions
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class ProtocolError(Exception):
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pass
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### Internal classes (users, servers, channels)
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class Irc():
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def initVars(self):
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self.connected.clear()
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self.aborted.clear()
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self.pseudoclient = None
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self.lastping = time.time()
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# Server, channel, and user indexes to be populated by our protocol module
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self.servers = {self.sid: IrcServer(None, self.serverdata['hostname'],
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internal=True, desc=self.serverdata.get('serverdesc')
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or self.botdata['serverdesc'])}
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self.users = {}
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self.channels = defaultdict(IrcChannel)
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# Sets flags such as whether to use halfops, etc. The default RFC1459
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# modes are implied.
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self.cmodes = {'op': 'o', 'secret': 's', 'private': 'p',
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'noextmsg': 'n', 'moderated': 'm', 'inviteonly': 'i',
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'topiclock': 't', 'limit': 'l', 'ban': 'b',
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'voice': 'v', 'key': 'k',
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# Type A, B, and C modes
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'*A': 'b',
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'*B': 'k',
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'*C': 'l',
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'*D': 'imnpstr'}
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self.umodes = {'invisible': 'i', 'snomask': 's', 'wallops': 'w',
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'oper': 'o',
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'*A': '', '*B': '', '*C': 's', '*D': 'iow'}
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# This max nick length starts off as the config value, but may be
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# overwritten later by the protocol module if such information is
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# received. Note that only some IRCds (InspIRCd) give us nick length
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# during link, so it is still required that the config value be set!
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self.maxnicklen = self.serverdata['maxnicklen']
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self.prefixmodes = {'o': '@', 'v': '+'}
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# Uplink SID (filled in by protocol module)
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self.uplink = None
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self.start_ts = int(time.time())
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# UID generators, for servers that need it
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self.uidgen = {}
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def __init__(self, netname, proto):
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# Initialize some variables
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self.name = netname.lower()
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self.conf = conf
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self.serverdata = conf['servers'][netname]
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self.sid = self.serverdata["sid"]
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self.botdata = conf['bot']
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self.protoname = proto.__name__
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self.proto = proto.Class(self)
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self.pingfreq = self.serverdata.get('pingfreq') or 30
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self.pingtimeout = self.pingfreq * 2
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self.connected = threading.Event()
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self.aborted = threading.Event()
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self.initVars()
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if world.testing:
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# HACK: Don't thread if we're running tests.
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self.connect()
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else:
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self.connection_thread = threading.Thread(target = self.connect)
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self.connection_thread.start()
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self.pingTimer = None
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def connect(self):
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ip = self.serverdata["ip"]
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port = self.serverdata["port"]
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while True:
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self.initVars()
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checks_ok = True
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try:
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self.socket = socket.socket()
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self.socket.setblocking(0)
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# Initial connection timeout is a lot smaller than the timeout after
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# we've connected; this is intentional.
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self.socket.settimeout(self.pingfreq)
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self.ssl = self.serverdata.get('ssl')
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if self.ssl:
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log.info('(%s) Attempting SSL for this connection...', self.name)
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certfile = self.serverdata.get('ssl_certfile')
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keyfile = self.serverdata.get('ssl_keyfile')
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if certfile and keyfile:
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try:
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self.socket = ssl.wrap_socket(self.socket,
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certfile=certfile,
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keyfile=keyfile)
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except OSError:
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log.exception('(%s) Caught OSError trying to '
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'initialize the SSL connection; '
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'are "ssl_certfile" and '
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'"ssl_keyfile" set correctly?',
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self.name)
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checks_ok = False
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else:
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log.error('(%s) SSL certfile/keyfile was not set '
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'correctly, aborting... ', self.name)
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checks_ok = False
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log.info("Connecting to network %r on %s:%s", self.name, ip, port)
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self.socket.connect((ip, port))
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self.socket.settimeout(self.pingtimeout)
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if self.ssl and checks_ok:
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peercert = self.socket.getpeercert(binary_form=True)
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sha1fp = hashlib.sha1(peercert).hexdigest()
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expected_fp = self.serverdata.get('ssl_fingerprint')
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if expected_fp:
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if sha1fp != expected_fp:
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log.error('(%s) Uplink\'s SSL certificate '
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'fingerprint (SHA1) does not match the '
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'one configured: expected %r, got %r; '
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'disconnecting...', self.name,
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expected_fp, sha1fp)
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checks_ok = False
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else:
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log.info('(%s) Uplink SSL certificate fingerprint '
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'(SHA1) verified: %r', self.name, sha1fp)
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else:
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log.info('(%s) Uplink\'s SSL certificate fingerprint '
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'is %r. You can enhance the security of your '
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'link by specifying this in a "ssl_fingerprint"'
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' option in your server block.', self.name,
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sha1fp)
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if checks_ok:
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self.proto.connect()
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self.spawnMain()
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log.info('(%s) Starting ping schedulers....', self.name)
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self.schedulePing()
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log.info('(%s) Server ready; listening for data.', self.name)
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self.run()
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else:
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log.error('(%s) A configuration error was encountered '
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'trying to set up this connection. Please check'
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' your configuration file and try again.',
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self.name)
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except (socket.error, ProtocolError, ConnectionError) as e:
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log.warning('(%s) Disconnected from IRC: %s: %s',
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self.name, type(e).__name__, str(e))
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self._disconnect()
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autoconnect = self.serverdata.get('autoconnect')
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log.debug('(%s) Autoconnect delay set to %s seconds.', self.name, autoconnect)
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if autoconnect is not None and autoconnect >= 0:
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log.info('(%s) Going to auto-reconnect in %s seconds.', self.name, autoconnect)
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time.sleep(autoconnect)
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else:
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return
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def msg(self, target, text, notice=False, source=None):
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"""Handy function to send messages/notices to clients. Source
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is optional, and defaults to the main PyLink client if not specified."""
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source = source or self.pseudoclient.uid
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if notice:
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self.proto.noticeClient(source, target, text)
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else:
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self.proto.messageClient(source, target, text)
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def _disconnect(self):
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log.debug('(%s) Canceling pingTimer at %s due to _disconnect() call', self.name, time.time())
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self.connected.clear()
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try:
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self.socket.close()
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self.pingTimer.cancel()
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except: # Socket timed out during creation; ignore
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pass
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# Internal hook signifying that a network has disconnected.
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self.callHooks([None, 'PYLINK_DISCONNECT', {}])
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def disconnect(self):
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"""Closes the IRC connection."""
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self.aborted.set()
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def run(self):
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buf = b""
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data = b""
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while not self.aborted.is_set():
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data = self.socket.recv(2048)
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buf += data
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if self.connected.is_set() and not data:
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log.warning('(%s) No data received and self.connected is set; disconnecting!', self.name)
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return
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elif (time.time() - self.lastping) > self.pingtimeout:
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log.warning('(%s) Connection timed out.', self.name)
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return
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while b'\n' in buf:
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line, buf = buf.split(b'\n', 1)
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line = line.strip(b'\r')
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# FIXME: respect other encodings?
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line = line.decode("utf-8", "replace")
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log.debug("(%s) <- %s", self.name, line)
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hook_args = None
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try:
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hook_args = self.proto.handle_events(line)
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except Exception:
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log.exception('(%s) Caught error in handle_events, disconnecting!', self.name)
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return
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# Only call our hooks if there's data to process. Handlers that support
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# hooks will return a dict of parsed arguments, which can be passed on
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# to plugins and the like. For example, the JOIN handler will return
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# something like: {'channel': '#whatever', 'users': ['UID1', 'UID2',
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# 'UID3']}, etc.
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if hook_args is not None:
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self.callHooks(hook_args)
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def callHooks(self, hook_args):
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numeric, command, parsed_args = hook_args
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# Always make sure TS is sent.
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if 'ts' not in parsed_args:
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parsed_args['ts'] = int(time.time())
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hook_cmd = command
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hook_map = self.proto.hook_map
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# Handlers can return a 'parse_as' key to send their payload to a
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# different hook. An example of this is "/join 0" being interpreted
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# as leaving all channels (PART).
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if command in hook_map:
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hook_cmd = hook_map[command]
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hook_cmd = parsed_args.get('parse_as') or hook_cmd
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log.debug('Parsed args %r received from %s handler (calling hook %s)', parsed_args, command, hook_cmd)
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# Iterate over hooked functions, catching errors accordingly
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for hook_func in world.command_hooks[hook_cmd]:
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try:
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log.debug('Calling function %s', hook_func)
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hook_func(self, numeric, command, parsed_args)
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except Exception:
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# We don't want plugins to crash our servers...
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log.exception('Unhandled exception caught in %r' % hook_func)
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continue
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def send(self, data):
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# Safeguard against newlines in input!! Otherwise, each line gets
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# treated as a separate command, which is particularly nasty.
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data = data.replace('\n', ' ')
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data = data.encode("utf-8") + b"\n"
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stripped_data = data.decode("utf-8").strip("\n")
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log.debug("(%s) -> %s", self.name, stripped_data)
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try:
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self.socket.send(data)
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except (OSError, AttributeError):
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log.debug("(%s) Dropping message %r; network isn't connected!", self.name, stripped_data)
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def schedulePing(self):
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self.proto.pingServer()
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self.pingTimer = threading.Timer(self.pingfreq, self.schedulePing)
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self.pingTimer.daemon = True
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self.pingTimer.start()
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log.debug('(%s) Ping scheduled at %s', self.name, time.time())
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def spawnMain(self):
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nick = self.botdata.get('nick') or 'PyLink'
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ident = self.botdata.get('ident') or 'pylink'
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host = self.serverdata["hostname"]
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log.info('(%s) Connected! Spawning main client %s.', self.name, nick)
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olduserobj = self.pseudoclient
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self.pseudoclient = self.proto.spawnClient(nick, ident, host, modes={("+o", None)})
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for chan in self.serverdata['channels']:
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self.proto.joinClient(self.pseudoclient.uid, chan)
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# PyLink internal hook called when spawnMain is called and the
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# contents of Irc().pseudoclient change.
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self.callHooks([self.sid, 'PYLINK_SPAWNMAIN', {'olduser': olduserobj}])
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class IrcUser():
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def __init__(self, nick, ts, uid, ident='null', host='null',
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realname='PyLink dummy client', realhost='null',
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ip='0.0.0.0'):
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self.nick = nick
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self.ts = ts
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self.uid = uid
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self.ident = ident
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self.host = host
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self.realhost = realhost
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self.ip = ip
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self.realname = realname
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self.modes = set()
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self.identified = False
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self.channels = set()
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self.away = ''
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def __repr__(self):
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return repr(self.__dict__)
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class IrcServer():
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"""PyLink IRC Server class.
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uplink: The SID of this IrcServer instance's uplink. This is set to None
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for the main PyLink PseudoServer!
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name: The name of the server.
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internal: Whether the server is an internal PyLink PseudoServer.
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"""
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def __init__(self, uplink, name, internal=False, desc="(None given)"):
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self.uplink = uplink
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self.users = set()
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self.internal = internal
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self.name = name.lower()
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self.desc = desc
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def __repr__(self):
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return repr(self.__dict__)
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class IrcChannel():
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def __init__(self):
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self.users = set()
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self.modes = {('n', None), ('t', None)}
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self.topic = ''
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self.ts = int(time.time())
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self.topicset = False
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self.prefixmodes = {'ops': set(), 'halfops': set(), 'voices': set(),
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'owners': set(), 'admins': set()}
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def __repr__(self):
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return repr(self.__dict__)
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def removeuser(self, target):
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for s in self.prefixmodes.values():
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s.discard(target)
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self.users.discard(target)
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### FakeIRC classes, used for test cases
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class FakeIRC(Irc):
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def connect(self):
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self.messages = []
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self.hookargs = []
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self.hookmsgs = []
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self.socket = None
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self.initVars()
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self.spawnMain()
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self.connected = threading.Event()
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self.connected.set()
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def run(self, data):
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"""Queues a message to the fake IRC server."""
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log.debug('<- ' + data)
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hook_args = self.proto.handle_events(data)
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if hook_args is not None:
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self.hookmsgs.append(hook_args)
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self.callHooks(hook_args)
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def send(self, data):
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self.messages.append(data)
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log.debug('-> ' + data)
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def takeMsgs(self):
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"""Returns a list of messages sent by the protocol module since
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the last takeMsgs() call, so we can track what has been sent."""
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msgs = self.messages
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self.messages = []
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return msgs
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def takeCommands(self, msgs):
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"""Returns a list of commands parsed from the output of takeMsgs()."""
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sidprefix = ':' + self.sid
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commands = []
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for m in msgs:
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args = m.split()
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if m.startswith(sidprefix):
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commands.append(args[1])
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else:
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commands.append(args[0])
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return commands
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def takeHooks(self):
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"""Returns a list of hook arguments sent by the protocol module since
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the last takeHooks() call."""
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hookmsgs = self.hookmsgs
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self.hookmsgs = []
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return hookmsgs
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class Protocol():
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# TODO: Future state-keeping things will go here
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def __init__(self, irc):
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self.irc = irc
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self.casemapping = 'rfc1459'
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self.hook_map = {}
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class FakeProto(Protocol):
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"""Dummy protocol module for testing purposes."""
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def handle_events(self, data):
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pass
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def connect(self):
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pass
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def spawnClient(self, nick, *args, **kwargs):
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uid = randint(1, 10000000000)
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ts = int(time.time())
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self.irc.users[uid] = user = IrcUser(nick, ts, uid)
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return user
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def joinClient(self, client, channel):
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self.irc.channels[channel].users.add(client)
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self.irc.users[client].channels.add(channel)
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FakeProto.Class = FakeProto
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