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PyLink/protocols/ngircd.py

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"""
ngircd.py: PyLink protocol module for ngIRCd.
"""
##
# Server protocol docs for ngIRCd can be found at:
# https://github.com/ngircd/ngircd/blob/master/doc/Protocol.txt
# and https://tools.ietf.org/html/rfc2813
##
import re
import time
from pylinkirc import __version__, conf, utils
from pylinkirc.classes import *
from pylinkirc.log import log
from pylinkirc.protocols.ircs2s_common import *
class NgIRCdProtocol(IRCS2SProtocol):
def __init__(self, irc):
super().__init__(irc)
self.conf_keys -= {'sid', 'sidrange'}
self.casemapping = 'ascii' # This is the default; it's actually set on server negotiation
self.hook_map = {'NJOIN': 'JOIN'}
# Track whether we've received end-of-burst from the uplink.
self.has_eob = False
self._caps = {}
self._use_builtin_005_handling = True
# ngIRCd has no TS tracking.
self.protocol_caps.discard('has-ts')
# Slash in nicks is problematic; while it works for basic things like JOIN and messages,
# attempts to set user modes fail.
self.protocol_caps |= {'slash-in-hosts', 'underscore-in-hosts'}
### Commands
def post_connect(self):
self.send('PASS %s 0210-IRC+ PyLink|%s:CHLMoX' % (self.serverdata['sendpass'], __version__))
# Note: RFC 2813 mandates another server token value after the hopcount (1), but ngIRCd
# doesn't follow that behaviour per https://github.com/ngircd/ngircd/issues/224
self.send("SERVER %s 1 :%s" % (self.serverdata['hostname'],
self.serverdata.get('serverdesc') or conf.conf['pylink']['serverdesc']))
self._uidgen = PUIDGenerator('PUID')
# The first "SID" this generator should return is 2, because server token 1 is implied to be
# the main PyLink server. RFC2813 has no official definition of SIDs, but rather uses
# integer tokens in the SERVER and NICK (user introduction) commands to keep track of which
# user exists on which server. Why did they do it this way? Who knows!
self._sidgen = PUIDGenerator('PSID', start=1)
self.sid = self._sidgen.next_sid(prefix=self.serverdata['hostname'])
self._caps.clear()
self.cmodes.update({
'banexception': 'e', 'invex': 'I', 'regmoderated': 'M', 'nonick': 'N',
'operonly': 'O', 'permanent': 'P', 'nokick': 'Q', 'registered': 'r',
'regonly': 'R', 'noinvite': 'V', 'sslonly': 'z'
})
self.umodes.update({
'away': 'a', 'deaf': 'b', 'bot': 'B', 'sno_clientconnections': 'c',
'deaf_commonchan': 'C', 'floodexempt': 'f', 'hidechans': 'I',
'servprotect': 'q', 'restricted': 'r', 'registered': 'R', 'cloak': 'x'
})
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.
Note 2: IP and realhost are ignored because ngIRCd does not send them.
"""
server = server or self.sid
assert '@' in server, "Need PSID for spawn_client, not pure server name!"
if not self.is_internal_server(server):
raise ValueError('Server %r is not a PyLink server!' % server)
realname = realname or conf.conf['pylink']['realname']
uid = self._uidgen.next_uid(prefix=nick)
userobj = self.users[uid] = User(self, nick, ts or int(time.time()), uid, server,
ident=ident, host=host, realname=realname,
manipulatable=manipulatable, opertype=opertype,
realhost=host)
self.apply_modes(uid, modes)
self.servers[server].users.add(uid)
# Grab our server token; this is used instead of server name to denote where the client is.
server_token = server.rsplit('@')[-1]
# <- :ngircd.midnight.local NICK GL 1 ~gl localhost 1 +io :realname
self._send_with_prefix(server, 'NICK %s %s %s %s %s %s :%s' % (nick, self.servers[server].hopcount,
ident, host, server_token, self.join_modes(modes), realname))
return userobj
def spawn_server(self, name, sid=None, uplink=None, desc=None):
"""
Spawns a server off a PyLink server.
* desc (server description) defaults to the one in the config.
* uplink defaults to the main PyLink server.
* SID is set equal to the server name for ngIRCd, as server UIDs are not used.
"""
uplink = uplink or self.sid
assert uplink in self.servers, "Unknown uplink %r?" % uplink
name = name.lower()
sid = self._sidgen.next_sid(prefix=name)
desc = desc or self.serverdata.get('serverdesc') or conf.conf['pylink']['serverdesc']
if sid in self.servers:
raise ValueError('A server named %r already exists!' % sid)
if not self.is_internal_server(uplink):
raise ValueError('Server %r is not a PyLink server!' % uplink)
if not self.is_server_name(name):
raise ValueError('Invalid server name %r' % name)
# https://tools.ietf.org/html/rfc2813#section-4.1.2
# We need to store a server token to introduce clients on the right server. Since this is just
# a number, we can simply use the counter in our PSID generator for this.
server_token = sid.rsplit('@')[-1]
self.servers[sid] = Server(self, uplink, name, internal=True, desc=desc)
self._send_with_prefix(uplink, 'SERVER %s %s %s :%s' % (name, self.servers[sid].hopcount, server_token, desc))
return sid
def away(self, source, text):
"""Sends an AWAY message from a PyLink client. If the text is empty, away status is unset."""
if not self.is_internal_client(source):
raise LookupError('No such PyLink client exists.')
# Away status is denoted on ngIRCd with umode +a.
modes = self.users[source].modes
if text and (('a', None) not in modes):
# Set umode +a if it isn't already set
self.mode(source, source, [('+a', None)])
elif ('a', None) in modes:
# Ditto, only unset the mode if it *was* set.
self.mode(source, source, [('-a', None)])
self.users[source].away = text
def join(self, client, 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 kill(self, source, target, reason):
"""Sends a kill from a PyLink client/server."""
if (not self.is_internal_client(source)) and \
(not self.is_internal_server(source)):
raise LookupError('No such PyLink client/server exists.')
# Follow ngIRCd's formatting of the kill messages for the most part
self._send_with_prefix(source, 'KILL %s :KILLed by %s: %s' % (self._expandPUID(target),
self.get_friendly_name(source), reason))
# Implicitly remove our own client if one was the target.
if self.is_internal_client(target):
self._remove_client(target)
def knock(self, numeric, target, text):
raise NotImplementedError('KNOCK is not supported on ngIRCd.')
def mode(self, source, target, modes, ts=None):
"""Sends mode changes from a PyLink client/server. The TS option is not used on ngIRCd."""
if (not self.is_internal_client(source)) and \
(not self.is_internal_server(source)):
raise LookupError('No such PyLink client/server %r exists' % source)
self.apply_modes(target, modes)
modes = list(modes) # Work around TypeError in the expand PUID section
if self.is_channel(target):
msgprefix = ':%s MODE %s ' % (self._expandPUID(source), target)
bufsize = self.S2S_BUFSIZE - len(msgprefix)
# Expand PUIDs when sending outgoing prefix 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]))
for modestr in self.wrap_modes(modes, bufsize, max_modes_per_msg=12):
self.send(msgprefix + modestr)
else:
joinedmodes = self.join_modes(modes)
self._send_with_prefix(source, 'MODE %s %s' % (self._expandPUID(target), joinedmodes))
def nick(self, source, newnick):
"""Changes the nick of a PyLink client."""
if not self.is_internal_client(source):
raise LookupError('No such PyLink client exists.')
self._send_with_prefix(source, 'NICK %s' % newnick)
self.users[source].nick = newnick
# Update the nick TS for consistency with other protocols (it isn't actually used in S2S)
self.users[source].ts = int(time.time())
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 ID (SID). TS is optional, and defaults
to the one we've stored in the channel state if not given.
<users> is a list of (prefix mode, UID) pairs:
Example uses:
sjoin('100', '#test', [('', 'user0@0'), ('o', user1@1'), ('v', 'someone@2')])
sjoin(self.sid, '#test', [('o', self.pseudoclient.uid)])
"""
server = server or self.sid
if not server:
raise LookupError('No such PyLink client exists.')
log.debug('(%s) sjoin: got %r for users', self.name, users)
njoin_prefix = ':%s NJOIN %s :' % (self._expandPUID(server), channel)
# Format the user list into strings such as @user1, +user2, user3, etc.
nicks_to_send = []
for userpair in users:
prefixes, uid = userpair
if uid not in self.users:
log.warning('(%s) Trying to NJOIN missing user %s?', self.name, uid)
continue
elif uid in self._channels[channel].users:
# Don't rejoin users already in the channel, this causes errors with ngIRCd.
continue
self._channels[channel].users.add(uid)
self.users[uid].channels.add(channel)
self.apply_modes(channel, (('+%s' % prefix, uid) for prefix in userpair[0]))
nicks_to_send.append(''.join(self.prefixmodes[modechar] for modechar in userpair[0]) + \
self._expandPUID(userpair[1]))
if nicks_to_send:
# Use 13 args max per line: this is equal to the max of 15 minus the command name and target channel.
for message in utils.wrap_arguments(njoin_prefix, nicks_to_send, self.S2S_BUFSIZE, separator=',', max_args_per_line=13):
self.send(message)
if modes:
# Burst modes separately if there are any.
log.debug("(%s) sjoin: bursting modes %r for channel %r now", self.name, modes, channel)
self.mode(server, channel, modes)
def set_server_ban(self, source, duration, user='*', host='*', reason='User banned'):
"""
Sets a server ban.
"""
# <- :GL GLINE *!*@bad.user 3d :test
assert not (user == host == '*'), "Refusing to set ridiculous ban on *@*"
self._send_with_prefix(source, 'GLINE *!%s@%s %s :%s' % (user, host, duration, 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)
real_target = self._expandPUID(target)
if field == 'IDENT':
self.users[target].ident = text
self._send_with_prefix(self.sid, 'METADATA %s user :%s' % (real_target, text))
if not self.is_internal_client(target):
# If the target wasn't one of our clients, send a hook payload for other plugins to listen to.
self.call_hooks([self.sid, 'CHGIDENT', {'target': target, 'newident': text}])
elif field == 'HOST':
self.users[target].host = text
if self.is_internal_client(target):
# For our own clients, replace the real host.
self._send_with_prefix(self.sid, 'METADATA %s host :%s' % (real_target, text))
else:
# For others, update the cloaked host and force a umode +x.
self._send_with_prefix(self.sid, 'METADATA %s cloakhost :%s' % (real_target, text))
if ('x', None) not in self.users[target].modes:
log.debug('(%s) Forcing umode +x on %r as part of cloak setting', self.name, target)
self.mode(self.sid, target, [('+x', None)])
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, 'METADATA %s info :%s' % (real_target, text))
if not self.is_internal_client(target):
self.call_hooks([self.sid, 'CHGNAME', {'target': target, 'newgecos': text}])
### Handlers
def handle_376(self, source, command, args):
# 376 is used to denote end of server negotiation - we send our info back at this point.
# <- :ngircd.midnight.local 005 pylink-devel.int NETWORK=ngircd-test :is my network name
# <- :ngircd.midnight.local 005 pylink-devel.int RFC2812 IRCD=ngIRCd CHARSET=UTF-8 CASEMAPPING=ascii PREFIX=(qaohv)~&@%+ CHANTYPES=#&+ CHANMODES=beI,k,l,imMnOPQRstVz CHANLIMIT=#&+:10 :are supported on this server
# <- :ngircd.midnight.local 005 pylink-devel.int CHANNELLEN=50 NICKLEN=21 TOPICLEN=490 AWAYLEN=127 KICKLEN=400 MODES=5 MAXLIST=beI:50 EXCEPTS=e INVEX=I PENALTY :are supported on this server
def f(numeric, msg):
self._send_with_prefix(self.sid, '%s %s %s' % (numeric, self.uplink, msg))
f('005', 'NETWORK=%s :is my network name' % self.get_full_network_name())
f('005', 'RFC2812 IRCD=PyLink CHARSET=UTF-8 CASEMAPPING=%s PREFIX=%s CHANTYPES=# '
'CHANMODES=%s,%s,%s,%s :are supported on this server' % (self.casemapping, self._caps['PREFIX'],
self.cmodes['*A'], self.cmodes['*B'], self.cmodes['*C'], self.cmodes['*D']))
f('005', 'CHANNELLEN NICKLEN=%s EXCEPTS=E INVEX=I :are supported on this server' % self.maxnicklen)
# 376 (end of MOTD) marks the end of extended server negotiation per
# https://github.com/ngircd/ngircd/blob/master/doc/Protocol.txt#L103-L112
f('376', ":End of server negotiation, happy PyLink'ing!")
def handle_chaninfo(self, source, command, args):
# https://github.com/ngircd/ngircd/blob/722afc1b810cef74dbd2738d71866176fd974ec2/doc/Protocol.txt#L146-L159
# CHANINFO has 3 styles depending on the amount of information applicable to a channel:
# CHANINFO <channel> +<modes>
# CHANINFO <channel> +<modes> <topic>
# CHANINFO <channel> +<modes> <key> <limit> <topic>
# If there is no key, the key is "*". If there is no limit, the limit is "0".
channel = args[0]
# Get rid of +l and +k in the initial parsing; we handle that later by looking at the CHANINFO arguments
modes = self.parse_modes(channel, args[1].replace('l', '').replace('k', ''))
if len(args) >= 3:
topic = args[-1]
if topic:
log.debug('(%s) handle_chaninfo: setting topic for %s to %r', self.name, channel, topic)
self._channels[channel].topic = topic
self._channels[channel].topicset = True
if len(args) >= 5:
key = args[2]
limit = args[3]
if key != '*':
modes.append(('+k', key))
if limit != '0':
modes.append(('+l', limit))
self.apply_modes(channel, modes)
def handle_join(self, source, command, args):
# RFC 2813 is odd to say the least... https://tools.ietf.org/html/rfc2813#section-4.2.1
# Basically, we expect messages of the forms:
# <- :GL JOIN #test\x07o
# <- :GL JOIN #moretest
for chanpair in args[0].split(','):
# Normalize channel case.
try:
channel, status = chanpair.split('\x07', 1)
if status in 'ov':
self.apply_modes(channel, [('+' + status, source)])
except ValueError:
channel = chanpair
c = self._channels[channel]
self.users[source].channels.add(channel)
self._channels[channel].users.add(source)
# Call hooks manually, because one JOIN command have multiple channels.
self.call_hooks([source, command, {'channel': channel, 'users': [source], 'modes': c.modes}])
def handle_kill(self, source, command, args):
"""Handles incoming KILLs."""
# ngIRCd sends QUIT after KILL for its own clients, so we shouldn't process this by itself
# unless we're the target.
killed = self._get_UID(args[0])
if self.is_internal_client(killed):
return super().handle_kill(source, command, args)
else:
log.debug("(%s) Ignoring KILL to %r as it isn't meant for us; we should see a QUIT soon",
self.name, killed)
def _check_cloak_change(self, target):
u = self.users[target]
old_host = u.host
if ('x', None) in u.modes and u.cloaked_host:
u.host = u.cloaked_host
elif u.realhost:
u.host = u.realhost
# Something changed, so send a CHGHOST hook
if old_host != u.host:
self.call_hooks([target, 'CHGHOST', {'target': target, 'newhost': u.host}])
def handle_metadata(self, source, command, args):
"""Handles various user metadata for ngIRCd (cloaked host, account name, etc.)"""
# <- :ngircd.midnight.local METADATA GL cloakhost :hidden-3a2a739e.ngircd.midnight.local
target = self._get_UID(args[0])
if target not in self.users:
log.warning("(%s) Ignoring METADATA to missing user %r?", self.name, target)
return
datatype = args[1]
u = self.users[target]
if datatype == 'cloakhost': # Set cloaked host
u.cloaked_host = args[-1]
self._check_cloak_change(target)
elif datatype == 'host': # Host changing. This actually sets the "real host" that ngIRCd stores
u.realhost = args[-1]
self._check_cloak_change(target)
elif datatype == 'user': # Ident changing
u.ident = args[-1]
self.call_hooks([target, 'CHGIDENT', {'target': target, 'newident': args[-1]}])
elif datatype == 'info': # Realname changing
u.realname = args[-1]
self.call_hooks([target, 'CHGNAME', {'target': target, 'newgecos': args[-1]}])
elif datatype == 'accountname': # Services account
self.call_hooks([target, 'CLIENT_SERVICES_LOGIN', {'text': args[-1]}])
def handle_nick(self, source, command, args):
"""
Handles the NICK command, used for server introductions and nick changes.
"""
if len(args) >= 2:
# User introduction:
# <- :ngircd.midnight.local NICK GL 1 ~gl localhost 1 +io :realname
nick = args[0]
assert source in self.servers, "Server %r tried to introduce nick %r but isn't in the servers index?" % (source, nick)
self._check_nick_collision(nick)
ident = args[2]
host = args[3]
uid = self._uidgen.next_uid(prefix=nick)
realname = args[-1]
ts = int(time.time())
self.users[uid] = User(self, nick, ts, uid, source, ident=ident, host=host,
realname=realname, realhost=host)
parsedmodes = self.parse_modes(uid, [args[5]])
self.apply_modes(uid, parsedmodes)
# Add the nick to the list of users on its server; this is used for SQUIT tracking
self.servers[source].users.add(uid)
# Check away status and cloaked host changes
self._check_umode_away_change(uid)
self._check_cloak_change(uid)
return {'uid': uid, 'ts': ts, 'nick': nick, 'realhost': host, 'host': host, 'ident': ident,
'parse_as': 'UID', 'ip': '0.0.0.0'}
else:
# Nick changes:
# <- :GL NICK :GL_
oldnick = self.users[source].nick
newnick = self.users[source].nick = args[0]
return {'newnick': newnick, 'oldnick': oldnick}
def handle_njoin(self, source, command, args):
# <- :ngircd.midnight.local NJOIN #test :tester,@%GL
channel = args[0]
chandata = self._channels[channel].deepcopy()
namelist = []
# Reverse the modechar->modeprefix mapping for quicker lookup
prefixchars = {v: k for k, v in self.prefixmodes.items()}
for userpair in args[1].split(','):
# Some regex magic to split the prefix from the nick.
r = re.search(r'([%s]*)(.*)' % ''.join(self.prefixmodes.values()), userpair)
user = self._get_UID(r.group(2))
modeprefix = r.group(1)
if modeprefix:
modes = {('+%s' % prefixchars[mode], user) for mode in modeprefix}
self.apply_modes(channel, modes)
namelist.append(user)
# Final bits of state tracking. (I hate having to do this everywhere...)
self.users[user].channels.add(channel)
self._channels[channel].users.add(user)
return {'channel': channel, 'users': namelist, 'modes': [], 'channeldata': chandata}
def handle_pass(self, source, command, args):
"""
Handles phase one of the ngIRCd login process (password auth and version info).
"""
# PASS is step one of server introduction, and is used to send the server info and password.
# <- :ngircd.midnight.local PASS xyzpassword 0210-IRC+ ngIRCd|24~3-gbc728f92:CHLMSXZ PZ
recvpass = args[0]
if recvpass != self.serverdata['recvpass']:
raise ProtocolError("RECVPASS from uplink does not match configuration!")
assert 'IRC+' in args[1], "Linking to non-ngIRCd server using this protocol module is not supported"
def handle_ping(self, source, command, args):
"""
Handles incoming PINGs (and implicit end of burst).
"""
self._send_with_prefix(self.sid, 'PONG %s :%s' % (self._expandPUID(self.sid), args[-1]), queue=False)
if not self.servers[source].has_eob:
# Treat the first PING we receive as end of burst.
self.servers[source].has_eob = True
if source == self.uplink:
self.connected.set()
# Return the endburst hook.
return {'parse_as': 'ENDBURST'}
def handle_server(self, source, command, args):
"""
Handles the SERVER command.
"""
# <- :ngircd.midnight.local SERVER ngircd.midnight.local 1 :ngIRCd dev server
servername = args[0].lower()
serverdesc = args[-1]
# The uplink should be set to None for the uplink; otherwise, set it equal to the sender server.
self.servers[servername] = Server(self, source if source != servername else None, servername, desc=serverdesc)
if self.uplink is None:
self.uplink = servername
log.debug('(%s) Got %s as uplink', self.name, servername)
else:
# Only send the SERVER hook if this isn't the initial connection.
return {'name': servername, 'sid': None, 'text': serverdesc}
Class = NgIRCdProtocol
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