""" unreal.py: UnrealIRCd 4.x protocol module for PyLink. """ import time import codecs import socket import re from pylinkirc import utils, conf from pylinkirc.classes import * from pylinkirc.log import log from pylinkirc.protocols.ts6_common import * SJOIN_PREFIXES = {'q': '*', 'a': '~', 'o': '@', 'h': '%', 'v': '+', 'b': '&', 'e': '"', 'I': "'"} class UnrealProtocol(TS6BaseProtocol): # I'm not sure what the real limit is, but the text posted at # https://github.com/GLolol/PyLink/issues/378 suggests 427 characters. # https://github.com/unrealircd/unrealircd/blob/4cad9cb/src/modules/m_server.c#L1260 may # also help. (but why BUFSIZE-*80*?) -GL S2S_BUFSIZE = 427 def __init__(self, *args, **kwargs): super().__init__(*args, **kwargs) self.protocol_caps |= {'slash-in-nicks', 'underscore-in-hosts'} # Set our case mapping (rfc1459 maps "\" and "|" together, for example) self.casemapping = 'ascii' self.proto_ver = 4017 self.min_proto_ver = 4000 self.hook_map = {'UMODE2': 'MODE', 'SVSKILL': 'KILL', 'SVSMODE': 'MODE', 'SVS2MODE': 'MODE', 'SJOIN': 'JOIN', 'SETHOST': 'CHGHOST', 'SETIDENT': 'CHGIDENT', 'SETNAME': 'CHGNAME', 'EOS': 'ENDBURST'} self.caps = [] self.prefixmodes = {'q': '~', 'a': '&', 'o': '@', 'h': '%', 'v': '+'} self.needed_caps = ["VL", "SID", "CHANMODES", "NOQUIT", "SJ3", "NICKIP", "UMODE2", "SJOIN"] # Command aliases to handlers defined in parent modules self.handle_svskill = self.handle_kill self.topic_burst = self.topic ### OUTGOING COMMAND FUNCTIONS def spawn_client(self, nick, ident='null', host='null', realhost=None, modes=set(), server=None, ip='0.0.0.0', realname=None, ts=None, opertype='IRC Operator', manipulatable=False): """ Spawns a new client with the given options. Note: No nick collision / valid nickname checks are done here; it is up to plugins to make sure they don't introduce anything invalid. """ server = server or self.sid if not self.is_internal_server(server): raise ValueError('Server %r is not a PyLink server!' % server) # Unreal 4.0 uses TS6-style UIDs. They don't start from AAAAAA like other IRCd's # do, but that doesn't matter to us... uid = self.uidgen[server].next_uid() ts = ts or int(time.time()) realname = realname or conf.conf['pylink']['realname'] realhost = realhost or host # Add +xt so that vHost cloaking always works. modes = set(modes) # Ensure type safety modes |= {('+x', None), ('+t', None)} raw_modes = self.join_modes(modes) u = self.users[uid] = User(self, nick, ts, uid, server, ident=ident, host=host, realname=realname, realhost=realhost, ip=ip, manipulatable=manipulatable, opertype=opertype) self.apply_modes(uid, modes) self.servers[server].users.add(uid) # UnrealIRCd requires encoding the IP by first packing it into a binary format, # and then encoding the binary with Base64. if ip == '0.0.0.0': # Dummy IP (for services, etc.) use a single *. encoded_ip = '*' else: try: # Try encoding as IPv4 first. binary_ip = socket.inet_pton(socket.AF_INET, ip) except OSError: try: # That failed, try IPv6 next. binary_ip = socket.inet_pton(socket.AF_INET6, ip) except OSError: raise ValueError("Invalid IPv4 or IPv6 address %r." % ip) # Encode in Base64. encoded_ip = codecs.encode(binary_ip, "base64") # Now, strip the trailing \n and decode into a string again. encoded_ip = encoded_ip.strip().decode() # <- :001 UID GL 0 1441306929 gl localhost 0018S7901 0 +iowx * midnight-1C620195 fwAAAQ== :realname self._send_with_prefix(server, "UID {nick} {hopcount} {ts} {ident} {realhost} {uid} 0 {modes} " "{host} * {ip} :{realname}".format(ts=ts, host=host, nick=nick, ident=ident, uid=uid, modes=raw_modes, realname=realname, realhost=realhost, ip=encoded_ip, hopcount=self.servers[server].hopcount)) return u def join(self, client, channel): """Joins a PyLink client to a channel.""" if not self.is_internal_client(client): raise LookupError('No such PyLink client exists.') self._send_with_prefix(client, "JOIN %s" % channel) self._channels[channel].users.add(client) self.users[client].channels.add(channel) def sjoin(self, server, channel, users, ts=None, modes=set()): """Sends an SJOIN for a group of users to a channel. The sender should always be a server (SID). TS is optional, and defaults to the one we've stored in the channel state if not given. is a list of (prefix mode, UID) pairs: Example uses: sjoin('100', '#test', [('', '100AAABBC'), ('o', 100AAABBB'), ('v', '100AAADDD')]) sjoin(self.sid, '#test', [('o', self.pseudoclient.uid)]) """ # <- :001 SJOIN 1444361345 #test :*@+1JJAAAAAB %2JJAAAA4C 1JJAAAADS server = server or self.sid assert users, "sjoin: No users sent?" if not server: raise LookupError('No such PyLink server exists.') changedmodes = set(modes or self._channels[channel].modes) orig_ts = self._channels[channel].ts ts = ts or orig_ts uids = [] itemlist = [] for userpair in users: assert len(userpair) == 2, "Incorrect format of userpair: %r" % userpair prefixes, user = userpair # Unreal uses slightly different prefixes in SJOIN. +q is * instead of ~, # and +a is ~ instead of &. # &, ", and ' are used for bursting bans. prefixchars = ''.join([SJOIN_PREFIXES.get(prefix, '') for prefix in prefixes]) if prefixchars: changedmodes |= {('+%s' % prefix, user) for prefix in prefixes} itemlist.append(prefixchars+user) uids.append(user) try: self.users[user].channels.add(channel) except KeyError: # Not initialized yet? log.debug("(%s) sjoin: KeyError trying to add %r to %r's channel list?", self.name, channel, user) # Track simple modes separately. simplemodes = set() for modepair in modes: if modepair[0][-1] in self.cmodes['*A']: # Bans, exempts, invex get expanded to forms like "&*!*@some.host" in SJOIN. if (modepair[0][-1], modepair[1]) in self._channels[channel].modes: # Mode is already set; skip it. continue sjoin_prefix = SJOIN_PREFIXES.get(modepair[0][-1]) if sjoin_prefix: itemlist.append(sjoin_prefix+modepair[1]) else: simplemodes.add(modepair) # Store the part of the SJOIN that we may reuse due to line wrapping (i.e. the sjoin # "prefix") sjoin_prefix = ":{sid} SJOIN {ts} {channel}".format(sid=server, ts=ts, channel=channel) # Modes are optional; add them if they exist if modes: sjoin_prefix += " %s" % self.join_modes(simplemodes) sjoin_prefix += " :" # Wrap arguments to the max supported S2S line length to prevent cutoff # (https://github.com/GLolol/PyLink/issues/378) for line in utils.wrap_arguments(sjoin_prefix, itemlist, self.S2S_BUFSIZE): self.send(line) self._channels[channel].users.update(uids) self.updateTS(server, channel, ts, changedmodes) def _ping_uplink(self): """Sends a PING to the uplink.""" if self.sid and self.uplink: self._send_with_prefix(self.sid, 'PING %s %s' % (self.get_friendly_name(self.sid), self.get_friendly_name(self.uplink))) def mode(self, numeric, target, modes, ts=None): """ Sends mode changes from a PyLink client/server. The mode list should be a list of (mode, arg) tuples, i.e. the format of utils.parse_modes() output. """ # <- :unreal.midnight.vpn MODE #test +ntCo GL 1444361345 if (not self.is_internal_client(numeric)) and \ (not self.is_internal_server(numeric)): raise LookupError('No such PyLink client/server exists.') self.apply_modes(target, modes) if self.is_channel(target): # Fix assignment TypeError in the expandPUID bit (sets can't be # assigned to by index). modes = list(modes) modes = list(modes) # Needed for indexing # Make sure we expand any PUIDs when sending outgoing modes... for idx, mode in enumerate(modes): if mode[0][-1] in self.prefixmodes: log.debug('(%s) mode: expanding PUID of mode %s', self.name, str(mode)) modes[idx] = (mode[0], self._expandPUID(mode[1])) # The MODE command is used for channel mode changes only ts = ts or self._channels[target].ts # 7 characters for "MODE", the space between MODE and the target, the space between the # target and mode list, and the space between the mode list and TS. bufsize = self.S2S_BUFSIZE - 7 # Subtract the length of the TS and channel arguments bufsize -= len(str(ts)) bufsize -= len(target) # Subtract the prefix (":SID " for servers or ":SIDAAAAAA " for servers) bufsize -= (5 if self.is_internal_server(numeric) else 11) # There is also an (undocumented) 15 args per line limit for MODE. The target, mode # characters, and TS take up three args, so we're left with 12 spaces for parameters. # Any lines that go over 15 args/line has the potential of corrupting a channel's TS # pretty badly, as the last argument gets mangled into a number: # * *** Warning! Possible desynch: MODE for channel #test ('+bbbbbbbbbbbb *!*@0.1 *!*@1.1 *!*@2.1 *!*@3.1 *!*@4.1 *!*@5.1 *!*@6.1 *!*@7.1 *!*@8.1 *!*@9.1 *!*@10.1 *!*@11.1') has fishy timestamp (12) (from pylink.local/pylink.local) # Thanks to kevin and Jobe for helping me debug this! for modestring in self.wrap_modes(modes, bufsize, max_modes_per_msg=12): self._send_with_prefix(numeric, 'MODE %s %s %s' % (target, modestring, ts)) else: # For user modes, the only way to set modes (for non-U:Lined servers) # is through UMODE2, which sets the modes on the caller. # U:Lines can use SVSMODE/SVS2MODE, but I won't expect people to # U:Line a PyLink daemon... if not self.is_internal_client(target): raise ProtocolError('Cannot force mode change on external clients!') # XXX: I don't expect usermode changes to ever get cut off, but length # checks could be added just to be safe... joinedmodes = self.join_modes(modes) self._send_with_prefix(target, 'UMODE2 %s' % joinedmodes) def set_server_ban(self, source, duration, user='*', host='*', reason='User banned'): """ Sets a server ban. """ # Permanent: # <- :unreal.midnight.vpn TKL + G ident host.net james!james@localhost 0 1500303745 :no reason # Temporary: # <- :unreal.midnight.vpn TKL + G * everyone james!james@localhost 1500303702 1500303672 :who needs reasons, do people even read them? assert not (user == host == '*'), "Refusing to set ridiculous ban on *@*" if source in self.users: # GLINEs are always forwarded from the server as far as I can tell. real_source = self.get_server(source) else: real_source = source setter = self.get_hostmask(source) if source in self.users else self.get_friendly_name(source) currtime = int(time.time()) self._send_with_prefix(real_source, 'TKL + G %s %s %s %s %s :%s' % (user, host, setter, currtime+duration if duration != 0 else 0, currtime, reason)) def update_client(self, target, field, text): """Updates the ident, host, or realname of any connected client.""" field = field.upper() if field not in ('IDENT', 'HOST', 'REALNAME', 'GECOS'): raise NotImplementedError("Changing field %r of a client is " "unsupported by this protocol." % field) if self.is_internal_client(target): # It is one of our clients, use SETIDENT/HOST/NAME. if field == 'IDENT': self.users[target].ident = text self._send_with_prefix(target, 'SETIDENT %s' % text) elif field == 'HOST': self.users[target].host = text self._send_with_prefix(target, 'SETHOST %s' % text) elif field in ('REALNAME', 'GECOS'): self.users[target].realname = text self._send_with_prefix(target, 'SETNAME :%s' % text) else: # It is a client on another server, use CHGIDENT/HOST/NAME. if field == 'IDENT': self.users[target].ident = text self._send_with_prefix(self.sid, 'CHGIDENT %s %s' % (target, text)) # Send hook payloads for other plugins to listen to. self.call_hooks([self.sid, 'CHGIDENT', {'target': target, 'newident': text}]) elif field == 'HOST': self.users[target].host = text self._send_with_prefix(self.sid, 'CHGHOST %s %s' % (target, text)) self.call_hooks([self.sid, 'CHGHOST', {'target': target, 'newhost': text}]) elif field in ('REALNAME', 'GECOS'): self.users[target].realname = text self._send_with_prefix(self.sid, 'CHGNAME %s :%s' % (target, text)) self.call_hooks([self.sid, 'CHGNAME', {'target': target, 'newgecos': text}]) def knock(self, numeric, target, text): """Sends a KNOCK from a PyLink client.""" # KNOCKs in UnrealIRCd are actually just specially formatted NOTICEs, # sent to all ops in a channel. # <- :unreal.midnight.vpn NOTICE @#test :[Knock] by GL|!gl@hidden-1C620195 (test) assert self.is_channel(target), "Can only knock on channels!" sender = self.get_server(numeric) s = '[Knock] by %s (%s)' % (self.get_hostmask(numeric), text) self._send_with_prefix(sender, 'NOTICE @%s :%s' % (target, s)) ### HANDLERS def post_connect(self): """Initializes a connection to a server.""" ts = self.start_ts self.prefixmodes = {'q': '~', 'a': '&', 'o': '@', 'h': '%', 'v': '+'} # Track usages of legacy (Unreal 3.2) nicks. self.legacy_uidgen = PUIDGenerator('U32user') self.umodes.update({'deaf': 'd', 'invisible': 'i', 'hidechans': 'p', 'protected': 'q', 'registered': 'r', 'snomask': 's', 'vhost': 't', 'wallops': 'w', 'bot': 'B', 'cloak': 'x', 'ssl': 'z', 'filter': 'G', 'hideoper': 'H', 'hideidle': 'I', 'regdeaf': 'R', 'servprotect': 'S', 'noctcp': 'T', 'showwhois': 'W', '*A': '', '*B': '', '*C': '', '*D': 'dipqrstwBxzGHIRSTW'}) f = self.send host = self.serverdata["hostname"] f('PASS :%s' % self.serverdata["sendpass"]) # https://github.com/unrealircd/unrealircd/blob/2f8cb55e/doc/technical/protoctl.txt # We support the following protocol features: # SJOIN - supports SJOIN for user introduction # SJ3 - extended SJOIN # NOQUIT - QUIT messages aren't sent for all users in a netsplit # NICKv2 - Extended NICK command, sending MODE and CHGHOST info with it # SID - Use UIDs and SIDs (Unreal 4) # VL - Sends version string in below SERVER message # UMODE2 - used for users setting modes on themselves (one less argument needed) # EAUTH - Early auth? (Unreal 4 linking protocol) # NICKIP - Extends the NICK command used for introduction (for Unreal 3.2 servers) # to include user IPs. # VHP - Sends cloaked hosts of UnrealIRCd 3.2 users as the hostname. This is important # because UnrealIRCd 3.2 only has one vHost field in its NICK command, and not two # like UnrealIRCd 4.0 (cloaked host + displayed host). Without VHP, cloaking does # not work for any UnrealIRCd 3.2 users. # ESVID - Supports account names in services stamps instead of just the signon time. # AFAIK this doesn't actually affect services' behaviour? f('PROTOCTL SJOIN SJ3 NOQUIT NICKv2 VL UMODE2 PROTOCTL NICKIP EAUTH=%s SID=%s VHP ESVID' % (self.serverdata["hostname"], self.sid)) sdesc = self.serverdata.get('serverdesc') or conf.conf['pylink']['serverdesc'] f('SERVER %s 1 U%s-h6e-%s :%s' % (host, self.proto_ver, self.sid, sdesc)) f('NETINFO 1 %s %s * 0 0 0 :%s' % (self.start_ts, self.proto_ver, self.serverdata.get("netname", self.name))) self._send_with_prefix(self.sid, 'EOS') # Extban definitions self.extbans_acting = {'quiet': '~q:', 'ban_nonick': '~n:', 'ban_nojoins': '~j:', 'filter': '~T:block:', 'filter_censor': '~T:censor:'} self.extbans_matching = {'ban_account': '~a:', 'ban_inchannel': '~c:', 'ban_opertype': '~O:', 'ban_realname': '~r:', 'ban_account_legacy': '~R:', 'ban_certfp': '~S:'} def handle_eos(self, numeric, command, args): """EOS is used to denote end of burst.""" self.servers[numeric].has_eob = True if numeric == self.uplink: self.connected.set() return {} def handle_uid(self, numeric, command, args): # <- :001 UID GL 0 1441306929 gl localhost 0018S7901 0 +iowx * midnight-1C620195 fwAAAQ== :realname # <- :001 UID GL| 0 1441389007 gl 10.120.0.6 001ZO8F03 0 +iwx * 391A9CB9.26A16454.D9847B69.IP CngABg== :realname # arguments: nick, hopcount?, ts, ident, real-host, UID, services account (0 if none), modes, # displayed host, cloaked (+x) host, base64-encoded IP, and realname nick = args[0] self._check_nick_collision(nick) ts, ident, realhost, uid, accountname, modestring, host = args[2:9] if host == '*': # A single * means that there is no displayed/virtual host, and # that it's the same as the real host host = args[9] # Decode UnrealIRCd's IPs, which are stored in base64-encoded network structure raw_ip = args[10].encode() # codecs.decode only takes bytes, not str if raw_ip == b'*': # Dummy IP (for services, etc.) ip = '0.0.0.0' else: # First, decode the Base64 string into a packed binary IP address. ip = codecs.decode(raw_ip, "base64") try: # IPv4 address. ip = socket.inet_ntop(socket.AF_INET, ip) except ValueError: # IPv6 address. ip = socket.inet_ntop(socket.AF_INET6, ip) # HACK: make sure a leading ":" in the IPv6 address (e.g. ::1) # doesn't cause it to be misinterpreted as the last argument # in a line, should it be mirrored to other networks. if ip.startswith(':'): ip = '0' + ip realname = args[-1] self.users[uid] = User(self, nick, ts, uid, numeric, ident, host, realname, realhost, ip) self.servers[numeric].users.add(uid) # Handle user modes parsedmodes = self.parse_modes(uid, [modestring]) self.apply_modes(uid, parsedmodes) # The cloaked (+x) host is completely separate from the displayed host # and real host in that it is ONLY shown if the user is +x (cloak mode # enabled) but NOT +t (vHost set). self.users[uid].cloaked_host = args[9] self._check_oper_status_change(uid, parsedmodes) if ('+x', None) not in parsedmodes: # If +x is not set, update to use the person's real host. self.users[uid].host = realhost # Set the account name if present: if this is a number, set it to the user nick. if ('+r', None) in parsedmodes and accountname.isdigit(): accountname = nick if not accountname.isdigit(): self.call_hooks([uid, 'CLIENT_SERVICES_LOGIN', {'text': accountname}]) # parse_as is used here to prevent legacy user introduction from being confused # with a nick change. return {'uid': uid, 'ts': ts, 'nick': nick, 'realhost': realhost, 'host': host, 'ident': ident, 'ip': ip, 'parse_as': 'UID'} def handle_pass(self, numeric, command, args): # <- PASS :abcdefg if args[0] != self.serverdata['recvpass']: raise ProtocolError("RECVPASS from uplink does not match configuration!") def handle_ping(self, numeric, command, args): if numeric == self.uplink: self.send('PONG %s :%s' % (self.serverdata['hostname'], args[-1]), queue=False) def handle_server(self, numeric, command, args): """Handles the SERVER command, which is used for both authentication and introducing legacy (non-SID) servers.""" # <- SERVER unreal.midnight.vpn 1 :U3999-Fhin6OoEM UnrealIRCd test server sname = args[0] if self.uplink not in self.servers: # We're doing authentication for cap in self.needed_caps: if cap not in self.caps: raise ProtocolError("Not all required capabilities were met " "by the remote server. Your version of UnrealIRCd " "is probably too old! (Got: %s, needed: %s)" % (sorted(self.caps), sorted(self.needed_caps))) sdesc = args[-1].split(" ", 1) # Get our protocol version. I really don't know why the version and the server # description aren't two arguments instead of one... -GLolol vline = sdesc[0].split('-', 1) sdesc = " ".join(sdesc[1:]) try: protover = int(vline[0].strip('U')) except ValueError: raise ProtocolError("Protocol version too old! (needs at least %s " "(Unreal 4.x), got something invalid; " "is VL being sent?)" % self.min_proto_ver) if protover < self.min_proto_ver: raise ProtocolError("Protocol version too old! (needs at least %s " "(Unreal 4.x), got %s)" % (self.min_proto_ver, protover)) self.servers[numeric] = Server(self, None, sname, desc=sdesc) else: # Legacy (non-SID) servers can still be introduced using the SERVER command. # <- :services.int SERVER a.bc 2 :(H) [GL] a return super().handle_server(numeric, command, args) def handle_protoctl(self, numeric, command, args): """Handles protocol negotiation.""" cmodes = {'noknock': 'K', 'limit': 'l', 'registered': 'r', 'flood_unreal': 'f', 'censor': 'G', 'noextmsg': 'n', 'invex': 'I', 'permanent': 'P', 'sslonly': 'z', 'operonly': 'O', 'moderated': 'm', 'blockcolor': 'c', 'regmoderated': 'M', 'noctcp': 'C', 'secret': 's', 'ban': 'b', 'nokick': 'Q', 'private': 'p', 'stripcolor': 'S', 'key': 'k', 'op': 'o', 'voice': 'v', 'regonly': 'R', 'noinvite': 'V', 'banexception': 'e', 'nonick': 'N', 'issecure': 'Z', 'topiclock': 't', 'nonotice': 'T', 'delayjoin': 'D', 'inviteonly': 'i'} # Make a list of all our capability names. self.caps += [arg.split('=')[0] for arg in args] # <- PROTOCTL NOQUIT NICKv2 SJOIN SJOIN2 UMODE2 VL SJ3 TKLEXT TKLEXT2 NICKIP ESVID # <- PROTOCTL CHANMODES=beI,k,l,psmntirzMQNRTOVKDdGPZSCc NICKCHARS= SID=001 MLOCK TS=1441314501 EXTSWHOIS for cap in args: if cap.startswith('SID'): self.uplink = cap.split('=', 1)[1] elif cap.startswith('CHANMODES'): # Parse all the supported channel modes. supported_cmodes = cap.split('=', 1)[1] self.cmodes['*A'], self.cmodes['*B'], self.cmodes['*C'], self.cmodes['*D'] = supported_cmodes.split(',') for namedmode, modechar in cmodes.items(): if modechar in supported_cmodes: self.cmodes[namedmode] = modechar self.cmodes['*B'] += 'f' # Add +f to the list too, dunno why it isn't there. # Add in the supported prefix modes. self.cmodes.update({'halfop': 'h', 'admin': 'a', 'owner': 'q', 'op': 'o', 'voice': 'v'}) def handle_join(self, numeric, command, args): """Handles the UnrealIRCd JOIN command.""" # <- :GL JOIN #pylink,#test if args[0] == '0': # /join 0; part the user from all channels oldchans = self.users[numeric].channels.copy() log.debug('(%s) Got /join 0 from %r, channel list is %r', self.name, numeric, oldchans) for ch in oldchans: self._channels[ch].users.discard(numeric) self.users[numeric].channels.discard(ch) return {'channels': oldchans, 'text': 'Left all channels.', 'parse_as': 'PART'} else: for channel in args[0].split(','): c = self._channels[channel] self.users[numeric].channels.add(channel) self._channels[channel].users.add(numeric) # Call hooks manually, because one JOIN command in UnrealIRCd can # have multiple channels... self.call_hooks([numeric, command, {'channel': channel, 'users': [numeric], 'modes': c.modes, 'ts': c.ts}]) def handle_sjoin(self, numeric, command, args): """Handles the UnrealIRCd SJOIN command.""" # <- :001 SJOIN 1444361345 #test :001AAAAAA @001AAAAAB +001AAAAAC # <- :001 SJOIN 1483250129 #services +nt :+001OR9V02 @*~001DH6901 &*!*@test "*!*@blah.blah '*!*@yes.no channel = args[1] chandata = self._channels[channel].deepcopy() userlist = args[-1].split() namelist = [] log.debug('(%s) handle_sjoin: got userlist %r for %r', self.name, userlist, channel) modestring = '' # FIXME: Implement edge-case mode conflict handling as documented here: # https://www.unrealircd.org/files/docs/technical/serverprotocol.html#S5_1 changedmodes = set() parsedmodes = [] try: if args[2].startswith('+'): modestring = args[2:-1] or args[2] # Strip extra spaces between the mode argument and the user list, if # there are any. XXX: report this as a bug in unreal's s2s protocol? modestring = [m for m in modestring if m] parsedmodes = self.parse_modes(channel, modestring) changedmodes = set(parsedmodes) except IndexError: pass for userpair in userlist: # &, ", and ' entries are used for bursting bans: # https://www.unrealircd.org/files/docs/technical/serverprotocol.html#S5_1 if userpair.startswith("&"): changedmodes.add(('+b', userpair[1:])) elif userpair.startswith('"'): changedmodes.add(('+e', userpair[1:])) elif userpair.startswith("'"): changedmodes.add(('+I', userpair[1:])) else: # Note: don't be too zealous in matching here or we'll break with nicks # like "[abcd]". r = re.search(r'([~*@%+]*)(.*)', userpair) user = r.group(2) if not user: # Userpair with no user? Ignore. XXX: find out how this is even possible... # <- :002 SJOIN 1486361658 #idlerpg :@ continue user = self._get_UID(user) # Normalize nicks to UIDs for Unreal 3.2 links # Unreal uses slightly different prefixes in SJOIN. +q is * instead of ~, # and +a is ~ instead of &. modeprefix = (r.group(1) or '').replace("~", "&").replace("*", "~") finalprefix = '' log.debug('(%s) handle_sjoin: got modeprefix %r for user %r', self.name, modeprefix, user) for m in modeprefix: # Iterate over the mapping of prefix chars to prefixes, and # find the characters that match. for char, prefix in self.prefixmodes.items(): if m == prefix: finalprefix += char namelist.append(user) self.users[user].channels.add(channel) # Only merge the remote's prefix modes if their TS is smaller or equal to ours. changedmodes |= {('+%s' % mode, user) for mode in finalprefix} self._channels[channel].users.add(user) our_ts = self._channels[channel].ts their_ts = int(args[0]) self.updateTS(numeric, channel, their_ts, changedmodes) return {'channel': channel, 'users': namelist, 'modes': parsedmodes, 'ts': their_ts, 'channeldata': chandata} def handle_nick(self, numeric, command, args): """Handles NICK changes, and legacy NICK introductions from pre-4.0 servers.""" if len(args) > 2: # Handle legacy NICK introduction here. # I don't want to rewrite all the user introduction stuff, so I'll just reorder the arguments # so that handle_uid can handle this instead. # But since legacy nicks don't have any UIDs attached, we'll have to store the users # internally using pseudo UIDs. In other words, we need to convert from this: # <- NICK Global 3 1456843578 services novernet.com services.novernet.com 0 +ioS * :Global Noticer # & nick hopcount timestamp username hostname server service-identifier-token :realname # With NICKIP and VHP enabled: # <- NICK GL32 2 1470699865 gl localhost unreal32.midnight.vpn GL +iowx hidden-1C620195 AAAAAAAAAAAAAAAAAAAAAQ== :realname # to this: # <- :001 UID GL 0 1441306929 gl localhost 0018S7901 0 +iowx * hidden-1C620195 fwAAAQ== :realname log.debug('(%s) got legacy NICK args: %s', self.name, ' '.join(args)) new_args = args[:] # Clone the old args list servername = new_args[5].lower() # Get the name of the users' server. # Fake a UID and put it where it belongs in the new-style UID command. These take the # NICK@COUNTER, where COUNTER is an int starting at 0 and incremented every time a new # user joins. fake_uid = self.legacy_uidgen.next_uid(prefix=args[0]) new_args[5] = fake_uid # This adds a dummy cloaked host (equal the real host) to put the displayed host in the # right position. As long as the VHP capability is respected, this will propagate +x cloaked # hosts from UnrealIRCd 3.2 users. Otherwise, +x host cloaking won't work! new_args.insert(-2, args[4]) log.debug('(%s) translating legacy NICK args to: %s', self.name, ' '.join(new_args)) return self.handle_uid(servername, 'UID_LEGACY', new_args) else: # Normal NICK change, just let ts6_common handle it. # :70MAAAAAA NICK GL-devel 1434744242 return super().handle_nick(numeric, command, args) def handle_mode(self, numeric, command, args): # <- :unreal.midnight.vpn MODE #test +bb test!*@* *!*@bad.net # <- :unreal.midnight.vpn MODE #test +q GL 1444361345 # <- :unreal.midnight.vpn MODE #test +ntCo GL 1444361345 # <- :unreal.midnight.vpn MODE #test +mntClfo 5 [10t]:5 GL 1444361345 # <- :GL MODE #services +v GL # This seems pretty relatively inconsistent - why do some commands have a TS at the end while others don't? # Answer: the first syntax (MODE sent by SERVER) is used for channel bursts - according to Unreal 3.2 docs, # the last argument should be interpreted as a timestamp ONLY if it is a number and the sender is a server. # Ban bursting does not give any TS, nor do normal users setting modes. SAMODE is special though, it will # send 0 as a TS argument (which should be ignored unless breaking the internal channel TS is desired). # Also, we need to get rid of that extra space following the +f argument. :| if self.is_channel(args[0]): channel = args[0] oldobj = self._channels[channel].deepcopy() modes = [arg for arg in args[1:] if arg] # normalize whitespace parsedmodes = self.parse_modes(channel, modes) if parsedmodes: if parsedmodes[0][0] == '+&': # UnrealIRCd uses a & virtual mode to denote mode bounces, meaning that an # attempt to set modes by us was rejected for some reason (usually due to # timestamps). Drop the mode change to prevent mode floods. log.debug("(%s) Received mode bounce %s in channel %s! Our TS: %s", self.name, modes, channel, self._channels[channel].ts) return self.apply_modes(channel, parsedmodes) if numeric in self.servers and args[-1].isdigit(): # Sender is a server AND last arg is number. Perform TS updates. their_ts = int(args[-1]) if their_ts > 0: self.updateTS(numeric, channel, their_ts) return {'target': channel, 'modes': parsedmodes, 'channeldata': oldobj} else: # User mode change target = self._get_UID(args[0]) return self._handle_umode(target, self.parse_modes(target, args[1:])) def _check_cloak_change(self, uid, parsedmodes): """ Checks whether +x/-x was set in the mode query, and changes the hostname of the user given to or from their cloaked host if True. """ userobj = self.users[uid] final_modes = userobj.modes oldhost = userobj.host if (('+x', None) in parsedmodes and ('t', None) not in final_modes) \ or (('-t', None) in parsedmodes and ('x', None) in final_modes): # If either: # 1) +x is being set, and the user does NOT have +t. # 2) -t is being set, but the user has +x set already. # We should update the user's host to their cloaked host and send # out a hook payload saying that the host has changed. newhost = userobj.host = userobj.cloaked_host elif ('-x', None) in parsedmodes or ('-t', None) in parsedmodes: # Otherwise, if either: # 1) -x is being set. # 2) -t is being set, but the person doesn't have +x set already. # (the case where the person DOES have +x is handled above) # Restore the person's host to the uncloaked real host. newhost = userobj.host = userobj.realhost else: # Nothing changed, just return. return if newhost != oldhost: # Only send a payload if the old and new hosts are different. self.call_hooks([uid, 'SETHOST', {'target': uid, 'newhost': newhost}]) def handle_svsmode(self, numeric, command, args): """Handles SVSMODE, used by services for setting user modes on others.""" # <- :source SVSMODE target +usermodes target = self._get_UID(args[0]) return self._handle_umode(target, self.parse_modes(target, args[1:])) def handle_svs2mode(self, sender, command, args): """ Handles SVS2MODE, which sets services login information on the given target. """ # In a nutshell: check for the +d argument: if it's an integer, ignore # it and set the user's account name to their nick. Otherwise, treat the # parameter as the new account name (this is known as logging in AS some account, # which is supported by atheme and Anope 2.x). # Logging in (with account info, atheme): # <- :NickServ SVS2MODE GL +rd GL # Logging in (without account info, anope 2.0?): # <- :NickServ SVS2MODE 001WCO6YK +r # Logging in (without account info, anope 1.8): # Note: ignore the timestamp. # <- :services.abc.net SVS2MODE GLolol +rd 1470696723 # Logging out (atheme): # <- :NickServ SVS2MODE GL -r+d 0 # Logging out (anope 1.8): # <- :services.abc.net SVS2MODE GLolol -r+d 1 # Logging out (anope 2.0): # <- :NickServ SVS2MODE 009EWLA03 -r # Logging in to account from a different nick (atheme): # Note: no +r is being set. # <- :NickServ SVS2MODE somenick +d GL # Logging in to account from a different nick (anope): # <- :NickServ SVS2MODE 001SALZ01 +d GL # <- :NickServ SVS2MODE 001SALZ01 +r target = self._get_UID(args[0]) parsedmodes = self.parse_modes(target, args[1:]) if ('+r', None) in parsedmodes: # Umode +r is being set (log in) try: # Try to get the account name (mode argument for +d) account = args[2] except IndexError: # If one doesn't exist, make it the same as the nick, but only if the account name # wasn't set already. if not self.users[target].services_account: account = self.get_friendly_name(target) else: return else: if account.isdigit(): # If the +d argument is a number, ignore it and set the account name to the nick. account = self.get_friendly_name(target) elif ('-r', None) in parsedmodes: # Umode -r being set. if not self.users[target].services_account: # User already has no account; ignore. return account = '' elif ('+d', None) in parsedmodes: # Nick identification status wasn't changed, but services account was. account = args[2] if account == '0': # +d 0 means logout account = '' else: return self.call_hooks([target, 'CLIENT_SERVICES_LOGIN', {'text': account}]) # The internal mode +d used for services stamps clashes with the DEAF mode, so don't parse it as # an actual mode mode parsing. return self._handle_umode(target, [mode for mode in parsedmodes if mode[0][-1] != 'd']) def _handle_umode(self, target, parsedmodes): """Internal helper function to parse umode changes.""" if not parsedmodes: return self.apply_modes(target, parsedmodes) self._check_oper_status_change(target, parsedmodes) self._check_cloak_change(target, parsedmodes) return {'target': target, 'modes': parsedmodes} def handle_umode2(self, source, command, args): """Handles UMODE2, used to set user modes on oneself.""" # <- :GL UMODE2 +W target = self._get_UID(source) return self._handle_umode(target, self.parse_modes(target, args)) def handle_topic(self, numeric, command, args): """Handles the TOPIC command.""" # <- GL TOPIC #services GL 1444699395 :weeee # <- TOPIC #services devel.relay 1452399682 :test channel = args[0] topic = args[-1] setter = args[1] ts = args[2] oldtopic = self._channels[channel].topic self._channels[channel].topic = topic self._channels[channel].topicset = True return {'channel': channel, 'setter': setter, 'ts': ts, 'text': topic, 'oldtopic': oldtopic} def handle_setident(self, numeric, command, args): """Handles SETIDENT, used for self ident changes.""" # <- :70MAAAAAB SETIDENT test self.users[numeric].ident = newident = args[0] return {'target': numeric, 'newident': newident} def handle_sethost(self, numeric, command, args): """Handles CHGHOST, used for self hostname changes.""" # <- :70MAAAAAB SETIDENT some.host self.users[numeric].host = newhost = args[0] # When SETHOST or CHGHOST is used, modes +xt are implicitly set on the # target. self.apply_modes(numeric, [('+x', None), ('+t', None)]) return {'target': numeric, 'newhost': newhost} def handle_setname(self, numeric, command, args): """Handles SETNAME, used for self real name/gecos changes.""" # <- :70MAAAAAB SETNAME :afdsafasf self.users[numeric].realname = newgecos = args[0] return {'target': numeric, 'newgecos': newgecos} def handle_chgident(self, numeric, command, args): """Handles CHGIDENT, used for denoting ident changes.""" # <- :GL CHGIDENT GL test target = self._get_UID(args[0]) self.users[target].ident = newident = args[1] return {'target': target, 'newident': newident} def handle_chghost(self, numeric, command, args): """Handles CHGHOST, used for denoting hostname changes.""" # <- :GL CHGHOST GL some.host target = self._get_UID(args[0]) self.users[target].host = newhost = args[1] # When SETHOST or CHGHOST is used, modes +xt are implicitly set on the # target. self.apply_modes(target, [('+x', None), ('+t', None)]) return {'target': target, 'newhost': newhost} def handle_chgname(self, numeric, command, args): """Handles CHGNAME, used for denoting real name/gecos changes.""" # <- :GL CHGNAME GL :afdsafasf target = self._get_UID(args[0]) self.users[target].realname = newgecos = args[1] return {'target': target, 'newgecos': newgecos} def handle_tsctl(self, source, command, args): """Handles /TSCTL alltime requests.""" # <- :GL TSCTL alltime if args[0] == 'alltime': self._send_with_prefix(self.sid, 'NOTICE %s :*** Server=%s time()=%d' % (source, self.hostname(), time.time())) Class = UnrealProtocol