""" classes.py - Base classes for PyLink IRC Services. This module contains the base classes used by PyLink, including threaded IRC connections and objects used to represent IRC servers, users, and channels. Here be dragons. """ import threading import time import socket import ssl import hashlib from copy import deepcopy import inspect import re from collections import defaultdict import ipaddress import queue try: import ircmatch except ImportError: raise ImportError("PyLink requires ircmatch to function; please install it and try again.") from . import world, utils, structures, conf, __version__ from .log import * ### Exceptions class ProtocolError(RuntimeError): pass ### Internal classes (users, servers, channels) class Irc(utils.DeprecatedAttributesObject): """Base IRC object for PyLink.""" def __init__(self, netname, proto, conf): """ Initializes an IRC object. This takes 3 variables: the network name (a string), the name of the protocol module to use for this connection, and a configuration object. """ self.deprecated_attributes = { 'conf': 'Deprecated since 1.2; consider switching to conf.conf', 'botdata': "Deprecated since 1.2; consider switching to conf.conf['bot']", } self.loghandlers = [] self.name = netname self.conf = conf self.sid = None self.serverdata = conf['servers'][netname] self.botdata = conf['bot'] self.protoname = proto.__name__.split('.')[-1] # Remove leading pylinkirc.protocols. self.proto = proto.Class(self) self.pingfreq = self.serverdata.get('pingfreq') or 90 self.pingtimeout = self.pingfreq * 2 self.queue = None self.connected = threading.Event() self.aborted = threading.Event() self.reply_lock = threading.RLock() self.pingTimer = None # Sets the multiplier for autoconnect delay (grows with time). self.autoconnect_active_multiplier = 1 self.initVars() if world.testing: # HACK: Don't thread if we're running tests. self.connect() else: self.connection_thread = threading.Thread(target=self.connect, name="Listener for %s" % self.name) self.connection_thread.start() def logSetup(self): """ Initializes any channel loggers defined for the current network. """ try: channels = conf.conf['logging']['channels'][self.name] except KeyError: # Not set up; just ignore. return log.debug('(%s) Setting up channel logging to channels %r', self.name, channels) if not self.loghandlers: # Only create handlers if they haven't already been set up. for channel, chandata in channels.items(): # Fetch the log level for this channel block. level = None if chandata is not None: level = chandata.get('loglevel') handler = PyLinkChannelLogger(self, channel, level=level) self.loghandlers.append(handler) log.addHandler(handler) def initVars(self): """ (Re)sets an IRC object to its default state. This should be called when an IRC object is first created, and on every reconnection to a network. """ self.pingfreq = self.serverdata.get('pingfreq') or 90 self.pingtimeout = self.pingfreq * 3 self.pseudoclient = None self.lastping = time.time() self.maxsendq = self.serverdata.get('maxsendq', 4096) self.queue = queue.Queue(self.maxsendq) # Internal variable to set the place and caller of the last command (in PM # or in a channel), used by fantasy command support. self.called_by = None self.called_in = None # Intialize the server, channel, and user indexes to be populated by # our protocol module. For the server index, we can add ourselves right # now. self.servers = {} self.users = {} self.channels = structures.KeyedDefaultdict(IrcChannel) # This sets the list of supported channel and user modes: the default # RFC1459 modes are implied. Named modes are used here to make # protocol-independent code easier to write, as mode chars vary by # IRCd. # Protocol modules should add to and/or replace this with what their # protocol supports. This can be a hardcoded list or something # negotiated on connect, depending on the nature of their protocol. self.cmodes = {'op': 'o', 'secret': 's', 'private': 'p', 'noextmsg': 'n', 'moderated': 'm', 'inviteonly': 'i', 'topiclock': 't', 'limit': 'l', 'ban': 'b', 'voice': 'v', 'key': 'k', # This fills in the type of mode each mode character is. # A-type modes are list modes (i.e. bans, ban exceptions, etc.), # B-type modes require an argument to both set and unset, # but there can only be one value at a time # (i.e. cmode +k). # C-type modes require an argument to set but not to unset # (one sets "+l limit" and # "-l"), # and D-type modes take no arguments at all. '*A': 'b', '*B': 'k', '*C': 'l', '*D': 'imnpstr'} self.umodes = {'invisible': 'i', 'snomask': 's', 'wallops': 'w', 'oper': 'o', '*A': '', '*B': '', '*C': '', '*D': 'iosw'} # This max nick length starts off as the config value, but may be # overwritten later by the protocol module if such information is # received. It defaults to 30. self.maxnicklen = self.serverdata.get('maxnicklen', 30) # Defines a list of supported prefix modes. self.prefixmodes = {'o': '@', 'v': '+'} # Defines the uplink SID (to be filled in by protocol module). self.uplink = None self.start_ts = int(time.time()) # Set up channel logging for the network self.logSetup() def processQueue(self): """Loop to process outgoing queue data.""" while not self.aborted.is_set(): throttle_time = self.serverdata.get('throttle_time', 0.005) data = self.queue.get(throttle_time) if data: self._send(data) log.debug('(%s) Stopping queue thread as aborted is set', self.name) def connect(self): """ Runs the connect loop for the IRC object. This is usually called by __init__ in a separate thread to allow multiple concurrent connections. """ while True: self.aborted.clear() self.initVars() try: self.proto.validateServerConf() except AssertionError as e: log.exception("(%s) Configuration error: %s", self.name, e) return ip = self.serverdata["ip"] port = self.serverdata["port"] checks_ok = True try: # Set the socket type (IPv6 or IPv4). stype = socket.AF_INET6 if self.serverdata.get("ipv6") else socket.AF_INET # Creat the socket. self.socket = socket.socket(stype) self.socket.setblocking(0) # Set the socket bind if applicable. if 'bindhost' in self.serverdata: self.socket.bind((self.serverdata['bindhost'], 0)) # Set the connection timeouts. Initial connection timeout is a # lot smaller than the timeout after we've connected; this is # intentional. self.socket.settimeout(self.pingfreq) # Resolve hostnames if it's not an IP address already. old_ip = ip ip = socket.getaddrinfo(ip, port, stype)[0][-1][0] log.debug('(%s) Resolving address %s to %s', self.name, old_ip, ip) # Enable SSL if set to do so. This requires a valid keyfile and # certfile to be present. self.ssl = self.serverdata.get('ssl') if self.ssl: log.info('(%s) Attempting SSL for this connection...', self.name) certfile = self.serverdata.get('ssl_certfile') keyfile = self.serverdata.get('ssl_keyfile') context = ssl.SSLContext(ssl.PROTOCOL_SSLv23) # Disable SSLv2 and SSLv3 - these are insecure context.options |= ssl.OP_NO_SSLv2 context.options |= ssl.OP_NO_SSLv3 if certfile and keyfile: try: context.load_cert_chain(certfile, keyfile) except OSError: log.exception('(%s) Caught OSError trying to ' 'initialize the SSL connection; ' 'are "ssl_certfile" and ' '"ssl_keyfile" set correctly?', self.name) checks_ok = False self.socket = context.wrap_socket(self.socket) log.info("Connecting to network %r on %s:%s", self.name, ip, port) self.socket.connect((ip, port)) self.socket.settimeout(self.pingtimeout) # If SSL was enabled, optionally verify the certificate # fingerprint for some added security. I don't bother to check # the entire certificate for validity, since most IRC networks # self-sign their certificates anyways. if self.ssl and checks_ok: peercert = self.socket.getpeercert(binary_form=True) # Hash type is configurable using the ssl_fingerprint_type # value, and defaults to sha256. hashtype = self.serverdata.get('ssl_fingerprint_type', 'sha256').lower() try: hashfunc = getattr(hashlib, hashtype) except AttributeError: log.error('(%s) Unsupported SSL certificate fingerprint type %r given, disconnecting...', self.name, hashtype) checks_ok = False else: fp = hashfunc(peercert).hexdigest() expected_fp = self.serverdata.get('ssl_fingerprint') if expected_fp and checks_ok: if fp != expected_fp: # SSL Fingerprint doesn't match; break. log.error('(%s) Uplink\'s SSL certificate ' 'fingerprint (%s) does not match the ' 'one configured: expected %r, got %r; ' 'disconnecting...', self.name, hashtype, expected_fp, fp) checks_ok = False else: log.info('(%s) Uplink SSL certificate fingerprint ' '(%s) verified: %r', self.name, hashtype, fp) else: log.info('(%s) Uplink\'s SSL certificate fingerprint (%s) ' 'is %r. You can enhance the security of your ' 'link by specifying this in a "ssl_fingerprint"' ' option in your server block.', self.name, hashtype, fp) if checks_ok: self.queue_thread = threading.Thread(name="Queue thread for %s" % self.name, target=self.processQueue, daemon=True) self.queue_thread.start() self.sid = self.serverdata.get("sid") # All our checks passed, get the protocol module to connect and run the listen # loop. This also updates any SID values should the protocol module do so. self.proto.connect() log.info('(%s) Enumerating our own SID %s', self.name, self.sid) host = self.hostname() self.servers[self.sid] = IrcServer(None, host, internal=True, desc=self.serverdata.get('serverdesc') or conf.conf['bot']['serverdesc']) log.info('(%s) Starting ping schedulers....', self.name) self.schedulePing() log.info('(%s) Server ready; listening for data.', self.name) self.autoconnect_active_multiplier = 1 # Reset any extra autoconnect delays self.run() else: # Configuration error :( log.error('(%s) A configuration error was encountered ' 'trying to set up this connection. Please check' ' your configuration file and try again.', self.name) # self.run() or the protocol module it called raised an exception, meaning we've disconnected! # Note: socket.error, ConnectionError, IOError, etc. are included in OSError since Python 3.3, # so we don't need to explicitly catch them here. # We also catch SystemExit here as a way to abort out connection threads properly, and stop the # IRC connection from freezing instead. except (OSError, RuntimeError, SystemExit) as e: log.error('(%s) Disconnected from IRC: %s: %s', self.name, type(e).__name__, str(e)) self.disconnect() # If autoconnect is enabled, loop back to the start. Otherwise, # return and stop. autoconnect = self.serverdata.get('autoconnect') # Sets the autoconnect growth multiplier (e.g. a value of 2 multiplies the autoconnect # time by 2 on every failure, etc.) autoconnect_multiplier = self.serverdata.get('autoconnect_multiplier', 2) autoconnect_max = self.serverdata.get('autoconnect_max', 1800) # These values must at least be 1. autoconnect_multiplier = max(autoconnect_multiplier, 1) autoconnect_max = max(autoconnect_max, 1) log.debug('(%s) Autoconnect delay set to %s seconds.', self.name, autoconnect) if autoconnect is not None and autoconnect >= 1: log.debug('(%s) Multiplying autoconnect delay %s by %s.', self.name, autoconnect, self.autoconnect_active_multiplier) autoconnect *= self.autoconnect_active_multiplier # Add a cap on the max. autoconnect delay, so that we don't go on forever... autoconnect = min(autoconnect, autoconnect_max) log.info('(%s) Going to auto-reconnect in %s seconds.', self.name, autoconnect) # Continue when either self.aborted is set or the autoconnect time passes. # Compared to time.sleep(), this allows us to stop connections quicker if we # break while while for autoconnect. self.aborted.clear() self.aborted.wait(autoconnect) # Store in the local state what the autoconnect multiplier currently is. self.autoconnect_active_multiplier *= autoconnect_multiplier if self not in world.networkobjects.values(): log.debug('Stopping stale connect loop for old connection %r', self.name) return else: log.info('(%s) Stopping connect loop (autoconnect value %r is < 1).', self.name, autoconnect) return def disconnect(self): """Handle disconnects from the remote server.""" was_successful = self.connected.is_set() log.debug('(%s) disconnect: got %s for was_successful state', self.name, was_successful) log.debug('(%s) disconnect: Clearing self.connected state.', self.name) self.connected.clear() log.debug('(%s) Removing channel logging handlers due to disconnect.', self.name) while self.loghandlers: log.removeHandler(self.loghandlers.pop()) try: log.debug('(%s) disconnect: Shutting down socket.', self.name) self.socket.shutdown(socket.SHUT_RDWR) except: # Socket timed out during creation; ignore pass self.socket.close() if self.pingTimer: log.debug('(%s) Canceling pingTimer at %s due to disconnect() call', self.name, time.time()) self.pingTimer.cancel() log.debug('(%s) disconnect: Setting self.aborted to True.', self.name) self.aborted.set() # Internal hook signifying that a network has disconnected. self.callHooks([None, 'PYLINK_DISCONNECT', {'was_successful': was_successful}]) log.debug('(%s) disconnect: Clearing state via initVars().', self.name) self.initVars() def run(self): """Main IRC loop which listens for messages.""" # Some magic below cause this to work, though anything that's # not encoded in UTF-8 doesn't work very well. buf = b"" data = b"" while not self.aborted.is_set(): try: data = self.socket.recv(2048) except OSError: # Suppress socket read warnings from lingering recv() calls if # we've been told to shutdown. if self.aborted.is_set(): return raise buf += data if not data: log.error('(%s) No data received, disconnecting!', self.name) return elif (time.time() - self.lastping) > self.pingtimeout: log.error('(%s) Connection timed out.', self.name) return while b'\n' in buf: line, buf = buf.split(b'\n', 1) line = line.strip(b'\r') # FIXME: respect other encodings? line = line.decode("utf-8", "replace") self.runline(line) def runline(self, line): """Sends a command to the protocol module.""" log.debug("(%s) <- %s", self.name, line) try: hook_args = self.proto.handle_events(line) except Exception: log.exception('(%s) Caught error in handle_events, disconnecting!', self.name) log.error('(%s) The offending line was: <- %s', self.name, line) self.aborted.set() return # Only call our hooks if there's data to process. Handlers that support # hooks will return a dict of parsed arguments, which can be passed on # to plugins and the like. For example, the JOIN handler will return # something like: {'channel': '#whatever', 'users': ['UID1', 'UID2', # 'UID3']}, etc. if hook_args is not None: self.callHooks(hook_args) return hook_args def callHooks(self, hook_args): """Calls a hook function with the given hook args.""" numeric, command, parsed_args = hook_args # Always make sure TS is sent. if 'ts' not in parsed_args: parsed_args['ts'] = int(time.time()) hook_cmd = command hook_map = self.proto.hook_map # If the hook name is present in the protocol module's hook_map, then we # should set the hook name to the name that points to instead. # For example, plugins will read SETHOST as CHGHOST, EOS (end of sync) # as ENDBURST, etc. if command in hook_map: hook_cmd = hook_map[command] # However, individual handlers can also return a 'parse_as' key to send # their payload to a different hook. An example of this is "/join 0" # being interpreted as leaving all channels (PART). hook_cmd = parsed_args.get('parse_as') or hook_cmd log.debug('(%s) Raw hook data: [%r, %r, %r] received from %s handler ' '(calling hook %s)', self.name, numeric, hook_cmd, parsed_args, command, hook_cmd) # Iterate over registered hook functions, catching errors accordingly. for hook_func in world.hooks[hook_cmd]: try: log.debug('(%s) Calling hook function %s from plugin "%s"', self.name, hook_func, hook_func.__module__) hook_func(self, numeric, command, parsed_args) except Exception: # We don't want plugins to crash our servers... log.exception('(%s) Unhandled exception caught in hook %r from plugin "%s"', self.name, hook_func, hook_func.__module__) log.error('(%s) The offending hook data was: %s', self.name, hook_args) continue def _send(self, data): """Sends raw text to the uplink server.""" # Safeguard against newlines in input!! Otherwise, each line gets # treated as a separate command, which is particularly nasty. data = data.replace('\n', ' ') data = data.encode("utf-8") + b"\n" stripped_data = data.decode("utf-8").strip("\n") log.debug("(%s) -> %s", self.name, stripped_data) try: self.socket.send(data) except (OSError, AttributeError): log.debug("(%s) Dropping message %r; network isn't connected!", self.name, stripped_data) def send(self, data, queue=True): """send() wrapper with optional queueing support.""" if queue: # XXX: we don't really know how to handle blocking queues yet, so # it's better to not expose that yet. self.queue.put_nowait(data) else: self._send(data) def schedulePing(self): """Schedules periodic pings in a loop.""" self.proto.ping() self.pingTimer = threading.Timer(self.pingfreq, self.schedulePing) self.pingTimer.daemon = True self.pingTimer.name = 'Ping timer loop for %s' % self.name self.pingTimer.start() log.debug('(%s) Ping scheduled at %s', self.name, time.time()) def __repr__(self): return "" % self.name ### General utility functions def callCommand(self, source, text): """ Calls a PyLink bot command. source is the caller's UID, and text is the full, unparsed text of the message. """ world.services['pylink'].call_cmd(self, source, text) def msg(self, target, text, notice=None, source=None, loopback=True): """Handy function to send messages/notices to clients. Source is optional, and defaults to the main PyLink client if not specified.""" if not text: return if not (source or self.pseudoclient): # No explicit source set and our main client wasn't available; abort. return source = source or self.pseudoclient.uid if notice: self.proto.notice(source, target, text) cmd = 'PYLINK_SELF_NOTICE' else: self.proto.message(source, target, text) cmd = 'PYLINK_SELF_PRIVMSG' if loopback: # Determines whether we should send a hook for this msg(), to relay things like services # replies across relay. self.callHooks([source, cmd, {'target': target, 'text': text}]) def _reply(self, text, notice=None, source=None, private=None, force_privmsg_in_private=False, loopback=True): """ Core of the reply() function - replies to the last caller in the right context (channel or PM). """ if private is None: # Allow using private replies as the default, if no explicit setting was given. private = conf.conf['bot'].get("prefer_private_replies") # Private reply is enabled, or the caller was originally a PM if private or (self.called_in in self.users): if not force_privmsg_in_private: # For private replies, the default is to override the notice=True/False argument, # and send replies as notices regardless. This is standard behaviour for most # IRC services, but can be disabled if force_privmsg_in_private is given. notice = True target = self.called_by else: target = self.called_in self.msg(target, text, notice=notice, source=source, loopback=loopback) def reply(self, *args, **kwargs): """ Replies to the last caller in the right context (channel or PM). This function wraps around _reply() and can be monkey-patched in a thread-safe manner to temporarily redirect plugin output to another target. """ with self.reply_lock: self._reply(*args, **kwargs) def error(self, text, **kwargs): """Replies with an error to the last caller in the right context (channel or PM).""" # This is a stub to alias error to reply self.reply("Error: %s" % text, **kwargs) def toLower(self, text): """Returns a lowercase representation of text based on the IRC object's casemapping (rfc1459 or ascii).""" if self.proto.casemapping == 'rfc1459': text = text.replace('{', '[') text = text.replace('}', ']') text = text.replace('|', '\\') text = text.replace('~', '^') # Encode the text as bytes first, and then lowercase it so that only ASCII characters are # changed. Unicode in channel names, etc. is case sensitive because IRC is just that old of # a protocol!!! return text.encode().lower().decode() def parseModes(self, target, args): """Parses a modestring list into a list of (mode, argument) tuples. ['+mitl-o', '3', 'person'] => [('+m', None), ('+i', None), ('+t', None), ('+l', '3'), ('-o', 'person')] """ # http://www.irc.org/tech_docs/005.html # A = Mode that adds or removes a nick or address to a list. Always has a parameter. # B = Mode that changes a setting and always has a parameter. # C = Mode that changes a setting and only has a parameter when set. # D = Mode that changes a setting and never has a parameter. if type(args) == str: # If the modestring was given as a string, split it into a list. args = args.split() assert args, 'No valid modes were supplied!' usermodes = not utils.isChannel(target) prefix = '' modestring = args[0] args = args[1:] if usermodes: log.debug('(%s) Using self.umodes for this query: %s', self.name, self.umodes) if target not in self.users: log.debug('(%s) Possible desync! Mode target %s is not in the users index.', self.name, target) return [] # Return an empty mode list supported_modes = self.umodes oldmodes = self.users[target].modes else: log.debug('(%s) Using self.cmodes for this query: %s', self.name, self.cmodes) supported_modes = self.cmodes oldmodes = self.channels[target].modes res = [] for mode in modestring: if mode in '+-': prefix = mode else: if not prefix: prefix = '+' arg = None log.debug('Current mode: %s%s; args left: %s', prefix, mode, args) try: if mode in self.prefixmodes and not usermodes: # We're setting a prefix mode on someone (e.g. +o user1) log.debug('Mode %s: This mode is a prefix mode.', mode) arg = args.pop(0) # Convert nicks to UIDs implicitly; most IRCds will want # this already. arg = self.nickToUid(arg) or arg if arg not in self.users: # Target doesn't exist, skip it. log.debug('(%s) Skipping setting mode "%s %s"; the ' 'target doesn\'t seem to exist!', self.name, mode, arg) continue elif mode in (supported_modes['*A'] + supported_modes['*B']): # Must have parameter. log.debug('Mode %s: This mode must have parameter.', mode) arg = args.pop(0) if prefix == '-': if mode in supported_modes['*B'] and arg == '*': # Charybdis allows unsetting +k without actually # knowing the key by faking the argument when unsetting # as a single "*". # We'd need to know the real argument of +k for us to # be able to unset the mode. oldarg = dict(oldmodes).get(mode) if oldarg: # Set the arg to the old one on the channel. arg = oldarg log.debug("Mode %s: coersing argument of '*' to %r.", mode, arg) log.debug('(%s) parseModes: checking if +%s %s is in old modes list: %s', self.name, mode, arg, oldmodes) if (mode, arg) not in oldmodes: # Ignore attempts to unset bans that don't exist. log.debug("(%s) parseModes(): ignoring removal of non-existent list mode +%s %s", self.name, mode, arg) continue elif prefix == '+' and mode in supported_modes['*C']: # Only has parameter when setting. log.debug('Mode %s: Only has parameter when setting.', mode) arg = args.pop(0) except IndexError: log.warning('(%s/%s) Error while parsing mode %r: mode requires an ' 'argument but none was found. (modestring: %r)', self.name, target, mode, modestring) continue # Skip this mode; don't error out completely. res.append((prefix + mode, arg)) return res def applyModes(self, target, changedmodes): """Takes a list of parsed IRC modes, and applies them on the given target. The target can be either a channel or a user; this is handled automatically.""" usermodes = not utils.isChannel(target) log.debug('(%s) Using usermodes for this query? %s', self.name, usermodes) try: if usermodes: old_modelist = self.users[target].modes supported_modes = self.umodes else: old_modelist = self.channels[target].modes supported_modes = self.cmodes except KeyError: log.warning('(%s) Possible desync? Mode target %s is unknown.', self.name, target) return modelist = set(old_modelist) log.debug('(%s) Applying modes %r on %s (initial modelist: %s)', self.name, changedmodes, target, modelist) for mode in changedmodes: # Chop off the +/- part that parseModes gives; it's meaningless for a mode list. try: real_mode = (mode[0][1], mode[1]) except IndexError: real_mode = mode if not usermodes: # We only handle +qaohv for now. Iterate over every supported mode: # if the IRCd supports this mode and it is the one being set, add/remove # the person from the corresponding prefix mode list (e.g. c.prefixmodes['op'] # for ops). for pmode, pmodelist in self.channels[target].prefixmodes.items(): if pmode in self.cmodes and real_mode[0] == self.cmodes[pmode]: log.debug('(%s) Initial prefixmodes list: %s', self.name, pmodelist) if mode[0][0] == '+': pmodelist.add(mode[1]) else: pmodelist.discard(mode[1]) log.debug('(%s) Final prefixmodes list: %s', self.name, pmodelist) if real_mode[0] in self.prefixmodes: # Don't add prefix modes to IrcChannel.modes; they belong in the # prefixmodes mapping handled above. log.debug('(%s) Not adding mode %s to IrcChannel.modes because ' 'it\'s a prefix mode.', self.name, str(mode)) continue if mode[0][0] != '-': # We're adding a mode existing = [m for m in modelist if m[0] == real_mode[0] and m[1] != real_mode[1]] if existing and real_mode[1] and real_mode[0] not in self.cmodes['*A']: # The mode we're setting takes a parameter, but is not a list mode (like +beI). # Therefore, only one version of it can exist at a time, and we must remove # any old modepairs using the same letter. Otherwise, we'll get duplicates when, # for example, someone sets mode "+l 30" on a channel already set "+l 25". log.debug('(%s) Old modes for mode %r exist on %s, removing them: %s', self.name, real_mode, target, str(existing)) [modelist.discard(oldmode) for oldmode in existing] modelist.add(real_mode) log.debug('(%s) Adding mode %r on %s', self.name, real_mode, target) else: log.debug('(%s) Removing mode %r on %s', self.name, real_mode, target) # We're removing a mode if real_mode[1] is None: # We're removing a mode that only takes arguments when setting. # Remove all mode entries that use the same letter as the one # we're unsetting. for oldmode in modelist.copy(): if oldmode[0] == real_mode[0]: modelist.discard(oldmode) else: modelist.discard(real_mode) log.debug('(%s) Final modelist: %s', self.name, modelist) try: if usermodes: self.users[target].modes = modelist else: self.channels[target].modes = modelist except KeyError: log.warning("(%s) Invalid MODE target %s (usermodes=%s)", self.name, target, usermodes) @staticmethod def _flip(mode): """Flips a mode character.""" # Make it a list first, strings don't support item assignment mode = list(mode) if mode[0] == '-': # Query is something like "-n" mode[0] = '+' # Change it to "+n" elif mode[0] == '+': mode[0] = '-' else: # No prefix given, assume + mode.insert(0, '-') return ''.join(mode) def reverseModes(self, target, modes, oldobj=None): """Reverses/Inverts the mode string or mode list given. Optionally, an oldobj argument can be given to look at an earlier state of a channel/user object, e.g. for checking the op status of a mode setter before their modes are processed and added to the channel state. This function allows both mode strings or mode lists. Example uses: "+mi-lk test => "-mi+lk test" "mi-k test => "-mi+k test" [('+m', None), ('+r', None), ('+l', '3'), ('-o', 'person') => {('-m', None), ('-r', None), ('-l', None), ('+o', 'person')}) {('s', None), ('+o', 'whoever') => {('-s', None), ('-o', 'whoever')}) """ origtype = type(modes) # If the query is a string, we have to parse it first. if origtype == str: modes = self.parseModes(target, modes.split(" ")) # Get the current mode list first. if utils.isChannel(target): c = oldobj or self.channels[target] oldmodes = c.modes.copy() possible_modes = self.cmodes.copy() # For channels, this also includes the list of prefix modes. possible_modes['*A'] += ''.join(self.prefixmodes) for name, userlist in c.prefixmodes.items(): try: oldmodes.update([(self.cmodes[name], u) for u in userlist]) except KeyError: continue else: oldmodes = self.users[target].modes possible_modes = self.umodes newmodes = [] log.debug('(%s) reverseModes: old/current mode list for %s is: %s', self.name, target, oldmodes) for char, arg in modes: # Mode types: # A = Mode that adds or removes a nick or address to a list. Always has a parameter. # B = Mode that changes a setting and always has a parameter. # C = Mode that changes a setting and only has a parameter when set. # D = Mode that changes a setting and never has a parameter. mchar = char[-1] if mchar in possible_modes['*B'] + possible_modes['*C']: # We need to find the current mode list, so we can reset arguments # for modes that have arguments. For example, setting +l 30 on a channel # that had +l 50 set should give "+l 30", not "-l". oldarg = [m for m in oldmodes if m[0] == mchar] if oldarg: # Old mode argument for this mode existed, use that. oldarg = oldarg[0] mpair = ('+%s' % oldarg[0], oldarg[1]) else: # Not found, flip the mode then. # Mode takes no arguments when unsetting. if mchar in possible_modes['*C'] and char[0] != '-': arg = None mpair = (self._flip(char), arg) else: mpair = (self._flip(char), arg) if char[0] != '-' and (mchar, arg) in oldmodes: # Mode is already set. log.debug("(%s) reverseModes: skipping reversing '%s %s' with %s since we're " "setting a mode that's already set.", self.name, char, arg, mpair) continue elif char[0] == '-' and (mchar, arg) not in oldmodes and mchar in possible_modes['*A']: # We're unsetting a prefixmode that was never set - don't set it in response! # Charybdis lacks verification for this server-side. log.debug("(%s) reverseModes: skipping reversing '%s %s' with %s since it " "wasn't previously set.", self.name, char, arg, mpair) continue newmodes.append(mpair) log.debug('(%s) reverseModes: new modes: %s', self.name, newmodes) if origtype == str: # If the original query is a string, send it back as a string. return self.joinModes(newmodes) else: return set(newmodes) @staticmethod def joinModes(modes, sort=False): """Takes a list of (mode, arg) tuples in parseModes() format, and joins them into a string. See testJoinModes in tests/test_utils.py for some examples.""" prefix = '+' # Assume we're adding modes unless told otherwise modelist = '' args = [] # Sort modes alphabetically like a conventional IRCd. if sort: modes = sorted(modes) for modepair in modes: mode, arg = modepair assert len(mode) in (1, 2), "Incorrect length of a mode (received %r)" % mode try: # If the mode has a prefix, use that. curr_prefix, mode = mode except ValueError: # If not, the current prefix stays the same; move on to the next # modepair. pass else: # If the prefix of this mode isn't the same as the last one, add # the prefix to the modestring. This prevents '+nt-lk' from turning # into '+n+t-l-k' or '+ntlk'. if prefix != curr_prefix: modelist += curr_prefix prefix = curr_prefix modelist += mode if arg is not None: args.append(arg) if not modelist.startswith(('+', '-')): # Our starting mode didn't have a prefix with it. Assume '+'. modelist = '+' + modelist if args: # Add the args if there are any. modelist += ' %s' % ' '.join(args) return modelist @classmethod def wrapModes(cls, modes, limit, max_modes_per_msg=0): """ Takes a list of modes and wraps it across multiple lines. """ strings = [] # This process is slightly trickier than just wrapping arguments, because modes create # positional arguments that can't be separated from its character. queued_modes = [] total_length = 0 last_prefix = '+' orig_modes = modes.copy() modes = list(modes) while modes: # PyLink mode lists come in the form [('+t', None), ('-b', '*!*@someone'), ('+l', 3)] # The +/- part is optional depending on context, and should either: # 1) The prefix of the last mode. # 2) + (adding modes), if no prefix was ever given next_mode = modes.pop(0) modechar, arg = next_mode prefix = modechar[0] if prefix not in '+-': prefix = last_prefix # Explicitly add the prefix to the mode character to prevent # ambiguity when passing it to joinModes(). modechar = prefix + modechar # XXX: because tuples are immutable, we have to replace the entire modepair.. next_mode = (modechar, arg) # Figure out the length that the next mode will add to the buffer. If we're changing # from + to - (setting to removing modes) or vice versa, we'll need two characters # ("+" or "-") plus the mode char itself. next_length = 1 if prefix != last_prefix: next_length += 1 # Replace the last_prefix with the current one for the next iteration. last_prefix = prefix if arg: # This mode has an argument, so add the length of that and a space. next_length += 1 next_length += len(arg) assert next_length <= limit, \ "wrapModes: Mode %s is too long for the given length %s" % (next_mode, limit) # Check both message length and max. modes per msg if enabled. if (next_length + total_length) <= limit and ((not max_modes_per_msg) or len(queued_modes) < max_modes_per_msg): # We can fit this mode in the next message; add it. total_length += next_length log.debug('wrapModes: Adding mode %s to queued modes', str(next_mode)) queued_modes.append(next_mode) log.debug('wrapModes: queued modes: %s', queued_modes) else: # Otherwise, create a new message by joining the previous queue. # Then, add our current mode. strings.append(cls.joinModes(queued_modes)) queued_modes.clear() log.debug('wrapModes: cleared queue (length %s) and now adding %s', limit, str(next_mode)) queued_modes.append(next_mode) total_length = next_length else: # Everything fit in one line, so just use that. strings.append(cls.joinModes(queued_modes)) log.debug('wrapModes: returning %s for %s', strings, orig_modes) return strings def version(self): """ Returns a detailed version string including the PyLink daemon version, the protocol module in use, and the server hostname. """ fullversion = 'PyLink-%s. %s :[protocol:%s]' % (__version__, self.hostname(), self.protoname) return fullversion def hostname(self): """ Returns the server hostname used by PyLink on the given server. """ return self.serverdata.get('hostname', world.fallback_hostname) ### State checking functions def nickToUid(self, nick): """Looks up the UID of a user with the given nick, if one is present.""" nick = self.toLower(nick) for k, v in self.users.copy().items(): if self.toLower(v.nick) == nick: return k def isInternalClient(self, numeric): """ Returns whether the given client numeric (UID) is a PyLink client. """ sid = self.getServer(numeric) if sid and self.servers[sid].internal: return True return False def isInternalServer(self, sid): """Returns whether the given SID is an internal PyLink server.""" return (sid in self.servers and self.servers[sid].internal) def getServer(self, numeric): """Finds the SID of the server a user is on.""" userobj = self.users.get(numeric) if userobj: return userobj.server def isManipulatableClient(self, uid): """ Returns whether the given user is marked as an internal, manipulatable client. Usually, automatically spawned services clients should have this set True to prevent interactions with opers (like mode changes) from causing desyncs. """ return self.isInternalClient(uid) and self.users[uid].manipulatable def getServiceBot(self, uid): """ Checks whether the given UID is a registered service bot. If True, returns the cooresponding ServiceBot object. """ userobj = self.users.get(uid) if not userobj: return False # Look for the "service" attribute in the IrcUser object, if one exists. try: sname = userobj.service # Warn if the service name we fetched isn't a registered service. if sname not in world.services.keys(): log.warning("(%s) User %s / %s had a service bot record to a service that doesn't " "exist (%s)!", self.name, uid, userobj.nick, sname) return world.services.get(sname) except AttributeError: return False def getHostmask(self, user, realhost=False, ip=False): """ Returns the hostmask of the given user, if present. If the realhost option is given, return the real host of the user instead of the displayed host. If the ip option is given, return the IP address of the user (this overrides realhost).""" userobj = self.users.get(user) try: nick = userobj.nick except AttributeError: nick = '' try: ident = userobj.ident except AttributeError: ident = '' try: if ip: host = userobj.ip elif realhost: host = userobj.realhost else: host = userobj.host except AttributeError: host = '' return '%s!%s@%s' % (nick, ident, host) def getFriendlyName(self, entityid): """ Returns the friendly name of a SID or UID (server name for SIDs, nick for UID). """ if entityid in self.servers: return self.servers[entityid].name elif entityid in self.users: return self.users[entityid].nick else: raise KeyError("Unknown UID/SID %s" % entityid) def getFullNetworkName(self): """ Returns the full network name (as defined by the "netname" option), or the short network name if that isn't defined. """ return self.serverdata.get('netname', self.name) def isOper(self, uid, allowAuthed=True, allowOper=True): """ Returns whether the given user has operator status on PyLink. This can be achieved by either identifying to PyLink as admin (if allowAuthed is True), or having user mode +o set (if allowOper is True). At least one of allowAuthed or allowOper must be True for this to give any meaningful results. """ if uid in self.users: if allowOper and ("o", None) in self.users[uid].modes: return True elif allowAuthed and self.users[uid].account: return True return False def checkAuthenticated(self, uid, allowAuthed=True, allowOper=True): """ Checks whether the given user has operator status on PyLink, raising NotAuthorizedError and logging the access denial if not. """ log.warning("(%s) Irc.checkAuthenticated() is deprecated as of PyLink 1.2 and may be " "removed in a future relase. Consider migrating to the PyLink Permissions API.", self.name) lastfunc = inspect.stack()[1][3] if not self.isOper(uid, allowAuthed=allowAuthed, allowOper=allowOper): log.warning('(%s) Access denied for %s calling %r', self.name, self.getHostmask(uid), lastfunc) raise utils.NotAuthorizedError("You are not authenticated!") return True def matchHost(self, glob, target, ip=True, realhost=True): """ Checks whether the given host, or given UID's hostmask matches the given nick!user@host glob. If the target given is a UID, and the 'ip' or 'realhost' options are True, this will also match against the target's IP address and real host, respectively. This function respects IRC casemappings (rfc1459 and ascii). If the given target is a UID, and the 'ip' option is enabled, the host portion of the glob is also matched as a CIDR range. """ # Get the corresponding casemapping value used by ircmatch. if self.proto.casemapping == 'rfc1459': casemapping = 0 else: casemapping = 1 # Try to convert target into a UID. If this fails, it's probably a hostname. target = self.nickToUid(target) or target # Allow queries like !$exttarget to invert the given match. invert = glob.startswith('!') if invert: glob = glob.lstrip('!') def match_host_core(): """ Core processor for matchHost(), minus the inversion check. """ # Work with variables in the matchHost() scope, from # http://stackoverflow.com/a/8178808 nonlocal glob # Prepare a list of hosts to check against. if target in self.users: if glob.startswith('$'): # Exttargets start with $. Skip regular ban matching and find the matching ban handler. glob = glob.lstrip('$') exttargetname = glob.split(':', 1)[0] handler = world.exttarget_handlers.get(exttargetname) if handler: # Handler exists. Return what it finds. result = handler(self, glob, target) log.debug('(%s) Got %s from exttarget %s in matchHost() glob $%s for target %s', self.name, result, exttargetname, glob, target) return result else: log.debug('(%s) Unknown exttarget %s in matchHost() glob $%s', self.name, exttargetname, glob) return False hosts = {self.getHostmask(target)} if ip: hosts.add(self.getHostmask(target, ip=True)) # HACK: support CIDR hosts in the hosts portion try: header, cidrtarget = glob.split('@', 1) log.debug('(%s) Processing CIDRs for %s (full host: %s)', self.name, cidrtarget, glob) # Try to parse the host portion as a CIDR range network = ipaddress.ip_network(cidrtarget) log.debug('(%s) Found CIDR for %s, replacing target host with IP %s', self.name, realhost, target) real_ip = self.users[target].ip if ipaddress.ip_address(real_ip) in network: # If the CIDR matches, hack around the host matcher by pretending that # the lookup target was the IP and not the CIDR range! glob = '@'.join((header, real_ip)) except ValueError: pass if realhost: hosts.add(self.getHostmask(target, realhost=True)) else: # We were given a host, use that. hosts = [target] # Iterate over the hosts to match using ircmatch. for host in hosts: if ircmatch.match(casemapping, glob, host): return True return False result = match_host_core() if invert: result = not result return result class IrcUser(): """PyLink IRC user class.""" def __init__(self, nick, ts, uid, server, ident='null', host='null', realname='PyLink dummy client', realhost='null', ip='0.0.0.0', manipulatable=False, opertype='IRC Operator'): self.nick = nick self.ts = ts self.uid = uid self.ident = ident self.host = host self.realhost = realhost self.ip = ip self.realname = realname self.modes = set() # Tracks user modes self.server = server # Tracks PyLink identification status self.account = '' # Tracks oper type (for display only) self.opertype = opertype # Tracks external services identification status self.services_account = '' # Tracks channels the user is in self.channels = set() # Tracks away message status self.away = '' # This sets whether the client should be marked as manipulatable. # Plugins like bots.py's commands should take caution against # manipulating these "protected" clients, to prevent desyncs and such. # For "serious" service clients, this should always be False. self.manipulatable = manipulatable def __repr__(self): return 'IrcUser(%s/%s)' % (self.uid, self.nick) class IrcServer(): """PyLink IRC server class. uplink: The SID of this IrcServer instance's uplink. This is set to None for the main PyLink PseudoServer! name: The name of the server. internal: Whether the server is an internal PyLink PseudoServer. """ def __init__(self, uplink, name, internal=False, desc="(None given)"): self.uplink = uplink self.users = set() self.internal = internal self.name = name.lower() self.desc = desc def __repr__(self): return 'IrcServer(%s)' % self.name class IrcChannel(): """PyLink IRC channel class.""" def __init__(self, name=None): # Initialize variables, such as the topic, user list, TS, who's opped, etc. self.users = set() self.modes = set() self.topic = '' self.ts = int(time.time()) self.prefixmodes = {'op': set(), 'halfop': set(), 'voice': set(), 'owner': set(), 'admin': set()} # Determines whether a topic has been set here or not. Protocol modules # should set this. self.topicset = False # Saves the channel name (may be useful to plugins, etc.) self.name = name def __repr__(self): return 'IrcChannel(%s)' % self.name def removeuser(self, target): """Removes a user from a channel.""" for s in self.prefixmodes.values(): s.discard(target) self.users.discard(target) def deepcopy(self): """Returns a deep copy of the channel object.""" return deepcopy(self) def isVoice(self, uid): """Returns whether the given user is voice in the channel.""" return uid in self.prefixmodes['voice'] def isHalfop(self, uid): """Returns whether the given user is halfop in the channel.""" return uid in self.prefixmodes['halfop'] def isOp(self, uid): """Returns whether the given user is op in the channel.""" return uid in self.prefixmodes['op'] def isAdmin(self, uid): """Returns whether the given user is admin (&) in the channel.""" return uid in self.prefixmodes['admin'] def isOwner(self, uid): """Returns whether the given user is owner (~) in the channel.""" return uid in self.prefixmodes['owner'] def isVoicePlus(self, uid): """Returns whether the given user is voice or above in the channel.""" # If the user has any prefix mode, it has to be voice or greater. return bool(self.getPrefixModes(uid)) def isHalfopPlus(self, uid): """Returns whether the given user is halfop or above in the channel.""" for mode in ('halfop', 'op', 'admin', 'owner'): if uid in self.prefixmodes[mode]: return True return False def isOpPlus(self, uid): """Returns whether the given user is op or above in the channel.""" for mode in ('op', 'admin', 'owner'): if uid in self.prefixmodes[mode]: return True return False @staticmethod def sortPrefixes(key): """ Implements a sorted()-compatible sorter for prefix modes, giving each one a numeric value. """ values = {'owner': 100, 'admin': 10, 'op': 5, 'halfop': 4, 'voice': 3} # Default to highest value (1000) for unknown modes, should we choose to # support them. return values.get(key, 1000) def getPrefixModes(self, uid, prefixmodes=None): """Returns a list of all named prefix modes the given user has in the channel. Optionally, a prefixmodes argument can be given to look at an earlier state of the channel's prefix modes mapping, e.g. for checking the op status of a mode setter before their modes are processed and added to the channel state. """ if uid not in self.users: raise KeyError("User %s does not exist or is not in the channel" % uid) result = [] prefixmodes = prefixmodes or self.prefixmodes for mode, modelist in prefixmodes.items(): if uid in modelist: result.append(mode) return sorted(result, key=self.sortPrefixes) class Protocol(): """Base Protocol module class for PyLink.""" def __init__(self, irc): self.irc = irc self.casemapping = 'rfc1459' self.hook_map = {} # Lock for updateTS to make sure only one thread can change the channel TS at one time. self.ts_lock = threading.Lock() # Lists required conf keys for the server block. self.conf_keys = {'ip', 'port', 'hostname', 'sid', 'sidrange', 'protocol', 'sendpass', 'recvpass'} # Defines a set of PyLink protocol capabilities self.protocol_caps = set() def validateServerConf(self): """Validates that the server block given contains the required keys.""" for k in self.conf_keys: assert k in self.irc.serverdata, "Missing option %r in server block for network %s." % (k, self.irc.name) port = self.irc.serverdata['port'] assert type(port) == int and 0 < port < 65535, "Invalid port %r for network %s" % (port, self.irc.name) @staticmethod def parseArgs(args): """ Parses a string or list of of RFC1459-style arguments, where ":" may be used for multi-word arguments that last until the end of a line. """ if isinstance(args, str): args = args.split(' ') real_args = [] for idx, arg in enumerate(args): if arg.startswith(':') and idx != 0: # ":" is used to begin multi-word arguments that last until the end of the message. # Use list splicing here to join them into one argument, and then add it to our list of args. joined_arg = ' '.join(args[idx:])[1:] # Cut off the leading : as well real_args.append(joined_arg) break real_args.append(arg) return real_args def hasCap(self, capab): """ Returns whether this protocol module instance has the requested capability. """ return capab.lower() in self.protocol_caps def removeClient(self, numeric): """Internal function to remove a client from our internal state.""" for c, v in self.irc.channels.copy().items(): v.removeuser(numeric) # Clear empty non-permanent channels. if not (self.irc.channels[c].users or ((self.irc.cmodes.get('permanent'), None) in self.irc.channels[c].modes)): del self.irc.channels[c] assert numeric not in v.users, "IrcChannel's removeuser() is broken!" sid = self.irc.getServer(numeric) log.debug('Removing client %s from self.irc.users', numeric) del self.irc.users[numeric] log.debug('Removing client %s from self.irc.servers[%s].users', numeric, sid) self.irc.servers[sid].users.discard(numeric) def updateTS(self, sender, channel, their_ts, modes=None): """ Merges modes of a channel given the remote TS and a list of modes. """ # Okay, so the situation is that we have 6 possible TS/sender combinations: # | our TS lower | TS equal | their TS lower # mode origin is us | OVERWRITE | MERGE | IGNORE # mode origin is uplink | IGNORE | MERGE | OVERWRITE if modes is None: modes = [] def _clear(): log.debug("(%s) Clearing local modes from channel %s due to TS change", self.irc.name, channel) self.irc.channels[channel].modes.clear() for p in self.irc.channels[channel].prefixmodes.values(): for user in p.copy(): if not self.irc.isInternalClient(user): p.discard(user) def _apply(): if modes: log.debug("(%s) Applying modes on channel %s (TS ok)", self.irc.name, channel) self.irc.applyModes(channel, modes) # Use a lock so only one thread can change a channel's TS at once: this prevents race # conditions from desyncing the channel list. with self.ts_lock: our_ts = self.irc.channels[channel].ts assert type(our_ts) == int, "Wrong type for our_ts (expected int, got %s)" % type(our_ts) assert type(their_ts) == int, "Wrong type for their_ts (expected int, got %s)" % type(their_ts) # Check if we're the mode sender based on the UID / SID given. our_mode = self.irc.isInternalClient(sender) or self.irc.isInternalServer(sender) log.debug("(%s/%s) our_ts: %s; their_ts: %s; is the mode origin us? %s", self.irc.name, channel, our_ts, their_ts, our_mode) if their_ts == our_ts: log.debug("(%s/%s) remote TS of %s is equal to our %s; mode query %s", self.irc.name, channel, their_ts, our_ts, modes) # Their TS is equal to ours. Merge modes. _apply() elif (their_ts < our_ts): if their_ts < 750000: log.warning('(%s) Possible desync? Not setting bogus TS %s on channel %s', self.irc.name, their_ts, channel) else: log.debug('(%s) Resetting channel TS of %s from %s to %s (remote has lower TS)', self.irc.name, channel, our_ts, their_ts) self.irc.channels[channel].ts = their_ts # Remote TS was lower and we're receiving modes. Clear the modelist and apply theirs. _clear() _apply() def _getSid(self, sname): """Returns the SID of a server with the given name, if present.""" name = sname.lower() for k, v in self.irc.servers.items(): if v.name.lower() == name: return k else: return sname # Fall back to given text instead of None def _getUid(self, target): """Converts a nick argument to its matching UID. This differs from irc.nickToUid() in that it returns the original text instead of None, if no matching nick is found.""" target = self.irc.nickToUid(target) or target return target @classmethod def parsePrefixedArgs(cls, args): """Similar to parseArgs(), but stripping leading colons from the first argument of a line (usually the sender field).""" args = cls.parseArgs(args) args[0] = args[0].split(':', 1)[1] return args def _squit(self, numeric, command, args): """Handles incoming SQUITs.""" split_server = self._getSid(args[0]) # Normally we'd only need to check for our SID as the SQUIT target, but Nefarious # actually uses the uplink server as the SQUIT target. # <- ABAAE SQ nefarious.midnight.vpn 0 :test if split_server in (self.irc.sid, self.irc.uplink): raise ProtocolError('SQUIT received: (reason: %s)' % args[-1]) affected_users = [] affected_nicks = defaultdict(list) log.debug('(%s) Splitting server %s (reason: %s)', self.irc.name, split_server, args[-1]) if split_server not in self.irc.servers: log.warning("(%s) Tried to split a server (%s) that didn't exist!", self.irc.name, split_server) return # Prevent RuntimeError: dictionary changed size during iteration old_servers = self.irc.servers.copy() old_channels = self.irc.channels.copy() # Cycle through our list of servers. If any server's uplink is the one that is being SQUIT, # remove them and all their users too. for sid, data in old_servers.items(): if data.uplink == split_server: log.debug('Server %s also hosts server %s, removing those users too...', split_server, sid) # Recursively run SQUIT on any other hubs this server may have been connected to. args = self._squit(sid, 'SQUIT', [sid, "0", "PyLink: Automatically splitting leaf servers of %s" % sid]) affected_users += args['users'] for user in self.irc.servers[split_server].users.copy(): affected_users.append(user) nick = self.irc.users[user].nick # Nicks affected is channel specific for SQUIT:. This makes Clientbot's SQUIT relaying # much easier to implement. for name, cdata in old_channels.items(): if user in cdata.users: affected_nicks[name].append(nick) log.debug('Removing client %s (%s)', user, nick) self.removeClient(user) serverdata = self.irc.servers[split_server] sname = serverdata.name uplink = serverdata.uplink del self.irc.servers[split_server] log.debug('(%s) Netsplit affected users: %s', self.irc.name, affected_users) return {'target': split_server, 'users': affected_users, 'name': sname, 'uplink': uplink, 'nicks': affected_nicks, 'serverdata': serverdata, 'channeldata': old_channels} @staticmethod def parseCapabilities(args, fallback=''): """ Parses a string of capabilities in the 005 / RPL_ISUPPORT format. """ if type(args) == str: args = args.split(' ') caps = {} for cap in args: try: # Try to split it as a KEY=VALUE pair. key, value = cap.split('=', 1) except ValueError: key = cap value = fallback caps[key] = value return caps @staticmethod def parsePrefixes(args): """ Separates prefixes field like "(qaohv)~&@%+" into a dict mapping mode characters to mode prefixes. """ prefixsearch = re.search(r'\(([A-Za-z]+)\)(.*)', args) return dict(zip(prefixsearch.group(1), prefixsearch.group(2))) def handle_error(self, numeric, command, args): """Handles ERROR messages - these mean that our uplink has disconnected us!""" raise ProtocolError('Received an ERROR, disconnecting!')