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PyLink/plugins/relay.py
James Lu 4a01948647 relay: oops, multiple STATUSMSG prefixes should pick the lowest, not highest (#570) 
This behaviour really isn't consistent across IRCds though...
- Unreal, Hybrid, and charybdis mangle messages at the server side to use the lowest prefix
- InspIRCd throws a "No such nick/channel" error
- Nefarious silently drops messages with multiple prefixes?
2018-02-18 22:29:16 -08:00

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# relay.py: PyLink Relay plugin
import time
import threading
import string
from collections import defaultdict
import inspect
from pylinkirc import utils, world, conf, structures
from pylinkirc.log import log
from pylinkirc.coremods import permissions
# Sets the timeout to wait for as individual servers / the PyLink daemon to start up.
TCONDITION_TIMEOUT = 2
### GLOBAL (statekeeping) VARIABLES
relayusers = defaultdict(dict)
relayservers = defaultdict(dict)
spawnlocks = defaultdict(threading.RLock)
spawnlocks_servers = defaultdict(threading.RLock)
channels_init_in_progress = defaultdict(threading.Event)
dbname = conf.getDatabaseName('pylinkrelay')
datastore = structures.PickleDataStore('pylinkrelay', dbname)
db = datastore.store
default_permissions = {"*!*@*": ['relay.linked'],
"$ircop": ['relay.create', 'relay.linkacl*',
'relay.destroy', 'relay.link', 'relay.delink',
'relay.claim']}
### INTERNAL FUNCTIONS
def initialize_all(irc):
"""Initializes all relay channels for the given IRC object."""
# Wait for all IRC objects to be created first. This prevents
# relay servers from being spawned too early (before server authentication),
# which would break connections.
if world.started.wait(TCONDITION_TIMEOUT):
for chanpair, entrydata in db.items():
network, channel = chanpair
# Initialize all channels that are relevant to the called network (i.e. channels either hosted there or a relay leaf channels)
if network == irc.name:
initialize_channel(irc, channel)
for link in entrydata['links']:
network, channel = link
if network == irc.name:
initialize_channel(irc, channel)
def main(irc=None):
"""Main function, called during plugin loading at start."""
log.debug('relay.main: loading links database')
datastore.load()
permissions.add_default_permissions(default_permissions)
if irc is not None:
# irc is defined when the plugin is reloaded. Otherwise, it means that we've just started the
# server. Iterate over all connected networks and initialize their relay users.
for ircobj in world.networkobjects.values():
if ircobj.connected.is_set():
initialize_all(ircobj)
log.debug('relay.main: finished initialization sequence')
def die(irc=None):
"""Deinitialize PyLink Relay by quitting all relay clients and saving the
relay DB."""
# For every connected network:
for ircobj in world.networkobjects.values():
# 1) SQUIT every relay subserver.
for server, sobj in ircobj.servers.copy().items():
if hasattr(sobj, 'remote'):
ircobj.proto.squit(ircobj.sid, server, text="Relay plugin unloaded.")
# 2) Clear our internal servers and users caches.
relayservers.clear()
relayusers.clear()
# 3) Unload our permissions.
permissions.remove_default_permissions(default_permissions)
# 4) Save the database and quit.
datastore.die()
allowed_chars = string.digits + string.ascii_letters + '/^|\\-_[]{}`'
fallback_separator = '|'
def normalize_nick(irc, netname, nick, times_tagged=0, uid=''):
"""
Creates a normalized nickname for the given nick suitable for introduction to a remote network
(as a relay client).
UID is optional for checking regular nick changes, to make sure that the sender doesn't get
marked as nick-colliding with itself.
"""
# Get the nick/net separator
separator = irc.serverdata.get('separator') or \
conf.conf.get('relay', {}).get('separator') or "/"
# Figure out whether we tag nicks or not.
if times_tagged == 0:
# Check the following options in order, before falling back to True:
# 1) servers::<netname>::relay_tag_nicks
# 2) relay::tag_nicks
if irc.serverdata.get('relay_tag_nicks', conf.conf.get('relay', {}).get('tag_nicks', True)):
times_tagged = 1
else:
forcetag_nicks = set(conf.conf.get('relay', {}).get('forcetag_nicks', []))
forcetag_nicks |= set(irc.serverdata.get('relay_forcetag_nicks', []))
log.debug('(%s) relay.normalize_nick: checking if globs %s match %s.', irc.name, forcetag_nicks, nick)
for glob in forcetag_nicks:
if irc.match_host(glob, nick):
# User matched a nick to force tag nicks for. Tag them.
times_tagged = 1
break
log.debug('(%s) relay.normalize_nick: using %r as separator.', irc.name, separator)
orig_nick = nick
maxnicklen = irc.maxnicklen
# Charybdis, IRCu, etc. don't allow / in nicks, and will SQUIT with a protocol
# violation if it sees one. Or it might just ignore the client introduction and
# cause bad desyncs.
protocol_allows_slashes = irc.has_cap('slash-in-nicks') or \
irc.serverdata.get('relay_force_slashes')
if '/' not in separator or not protocol_allows_slashes:
separator = separator.replace('/', fallback_separator)
nick = nick.replace('/', fallback_separator)
if nick.startswith(tuple(string.digits+'-')):
# On TS6 IRCds, nicks that start with 0-9 are only allowed if
# they match the UID of the originating server. Otherwise, you'll
# get nasty protocol violation SQUITs!
# Nicks starting with - are likewise not valid.
nick = '_' + nick
# Maximum allowed length that relay nicks may have, minus the /network tag if used.
allowedlength = maxnicklen
# Track how many times the given nick has been tagged. If this is 0, no tag is used.
# If this is 1, a /network tag is added. Otherwise, keep adding one character to the
# separator: GLolol -> GLolol/net1 -> GLolol//net1 -> ...
if times_tagged >= 1:
suffix = "%s%s%s" % (separator[0]*times_tagged, separator[1:], netname)
allowedlength -= len(suffix)
# If a nick is too long, the real nick portion will be cut off, but the
# /network suffix MUST remain the same.
nick = nick[:allowedlength]
if times_tagged >= 1:
nick += suffix
# Loop over every character in the nick, making sure that it only contains valid
# characters.
for char in nick:
if char not in allowed_chars:
nick = nick.replace(char, fallback_separator)
while irc.nick_to_uid(nick) and irc.nick_to_uid(nick) != uid:
# The nick we want exists: Increase the separator length by 1 if the user was already
# tagged, but couldn't be created due to a nick conflict. This can happen when someone
# steals a relay user's nick.
# However, if a user is changing from, say, a long, cut-off nick to another long, cut-off
# nick, we would skip tagging the nick twice if they originate from the same UID.
times_tagged += 1
log.debug('(%s) relay.normalize_nick: nick %r is in use; incrementing times tagged to %s.',
irc.name, nick, times_tagged)
nick = normalize_nick(irc, netname, orig_nick, times_tagged=times_tagged, uid=uid)
finalLength = len(nick)
assert finalLength <= maxnicklen, "Normalized nick %r went over max " \
"nick length (got: %s, allowed: %s!)" % (nick, finalLength, maxnicklen)
return nick
def normalize_host(irc, host):
"""Creates a normalized hostname for the given host suitable for
introduction to a remote network (as a relay client)."""
log.debug('(%s) relay.normalize_host: IRCd=%s, host=%s', irc.name, irc.protoname, host)
allowed_chars = string.ascii_letters + string.digits + '-.:'
if irc.has_cap('slash-in-hosts'):
# UnrealIRCd and IRCd-Hybrid don't allow slashes in hostnames
allowed_chars += '/'
if irc.has_cap('underscore-in-hosts'):
# Most IRCds allow _ in hostnames, but hybrid/charybdis/ratbox IRCds do not.
allowed_chars += '_'
for char in host:
if char not in allowed_chars:
host = host.replace(char, '-')
return host[:63] # Limit hosts to 63 chars for best compatibility
def get_prefix_modes(irc, remoteirc, channel, user, mlist=None):
"""
Fetches all prefix modes for a user in a channel that are supported by the
remote IRC network given.
Optionally, an mlist argument can be given to look at an earlier state of
the channel, e.g. for checking the op status of a mode setter before their
modes are processed and added to the channel state.
"""
modes = ''
if channel in irc.channels and user in irc.channels[channel].users:
# Iterate over the the prefix modes for relay supported by the remote IRCd.
for pmode in irc.channels[channel].get_prefix_modes(user, prefixmodes=mlist):
if pmode in remoteirc.cmodes:
modes += remoteirc.cmodes[pmode]
return modes
def spawn_relay_server(irc, remoteirc):
"""
Spawns a relay server representing "remoteirc" on "irc".
"""
if irc.connected.is_set():
try:
suffix = irc.serverdata.get('server_suffix', conf.conf.get('relay', {}).get('server_suffix', 'relay'))
# Strip any leading or trailing .'s
suffix = suffix.strip('.')
# On some IRCds (e.g. InspIRCd), we have to delay endburst to prevent triggering
# join flood protections that are counted locally.
needs_delayed_eob = hasattr(irc, '_endburst_delay')
if needs_delayed_eob:
old_eob_delay = irc._endburst_delay
irc._endburst_delay = irc.serverdata.get('relay_endburst_delay', 10)
sid = irc.spawn_server('%s.%s' % (remoteirc.name, suffix),
desc="PyLink Relay network - %s" %
(remoteirc.get_full_network_name()))
# Set _endburst_delay back to its last value.
if needs_delayed_eob:
irc._endburst_delay = old_eob_delay
except (RuntimeError, ValueError): # Network not initialized yet, or a server name conflict.
log.exception('(%s) Failed to spawn server for %r (possible jupe?):',
irc.name, remoteirc.name)
# We will just bail here. Disconnect the bad network.
irc.disconnect()
return
# Mark the server as a relay server
irc.servers[sid].remote = remoteirc.name
# Assign the newly spawned server as our relay server for the target net.
relayservers[irc.name][remoteirc.name] = sid
return sid
else:
log.debug('(%s) skipping spawn_relay_server(%s, %s); the local server (%s) is not ready yet',
irc.name, irc.name, remoteirc.name, irc.name)
log.debug('(%s) spawn_relay_server: current thread is %s',
irc.name, threading.current_thread().name)
def get_relay_server_sid(irc, remoteirc, spawn_if_missing=True):
"""
Fetches the relay server SID representing remoteirc on irc, spawning
a new server if it doesn't exist and spawn_if_missing is enabled.
"""
log.debug('(%s) Grabbing spawnlocks_servers[%s] from thread %r in function %r', irc.name, irc.name,
threading.current_thread().name, inspect.currentframe().f_code.co_name)
if spawnlocks_servers[irc.name].acquire(timeout=TCONDITION_TIMEOUT):
try:
sid = relayservers[irc.name][remoteirc.name]
except KeyError:
if not spawn_if_missing:
log.debug('(%s) get_relay_server_sid: %s.relay doesn\'t have a known SID, ignoring.', irc.name, remoteirc.name)
spawnlocks_servers[irc.name].release()
return
log.debug('(%s) get_relay_server_sid: %s.relay doesn\'t have a known SID, spawning.', irc.name, remoteirc.name)
sid = spawn_relay_server(irc, remoteirc)
log.debug('(%s) get_relay_server_sid: got %s for %s.relay', irc.name, sid, remoteirc.name)
if sid not in irc.servers:
log.warning('(%s) Possible desync? SID %s for %s.relay doesn\'t exist anymore', irc.name, sid, remoteirc.name)
# Our stored server doesn't exist anymore. This state is probably a holdover from a netsplit,
# so let's refresh it.
sid = spawn_relay_server(irc, remoteirc)
elif sid in irc.servers and irc.servers[sid].remote != remoteirc.name:
log.debug('(%s) Possible desync? SID %s for %s.relay doesn\'t exist anymore is mismatched (got %s.relay)', irc.name, irc.servers[sid].remote, remoteirc.name)
sid = spawn_relay_server(irc, remoteirc)
log.debug('(%s) get_relay_server_sid: got %s for %s.relay (round 2)', irc.name, sid, remoteirc.name)
spawnlocks_servers[irc.name].release()
return sid
def spawn_relay_user(irc, remoteirc, user, times_tagged=0):
"""
Spawns a relay user representing "user" from "irc" (the local network) on remoteirc (the target network).
"""
userobj = irc.users.get(user)
if userobj is None:
# The query wasn't actually a valid user, or the network hasn't
# been connected yet... Oh well!
return
nick = normalize_nick(remoteirc, irc.name, userobj.nick, times_tagged=times_tagged)
# Truncate idents at 10 characters, because TS6 won't like them otherwise!
ident = userobj.ident[:10]
# Normalize hostnames
host = normalize_host(remoteirc, userobj.host)
realname = userobj.realname
modes = set(get_supported_umodes(irc, remoteirc, userobj.modes))
opertype = ''
if ('o', None) in userobj.modes:
# Try to get the oper type, adding an "(on <networkname>)" suffix similar to what
# Janus does.
if hasattr(userobj, 'opertype'):
log.debug('(%s) relay.get_remote_user: setting OPERTYPE of client for %r to %s',
irc.name, user, userobj.opertype)
opertype = userobj.opertype
else:
opertype = 'IRC Operator'
opertype += ' (on %s)' % irc.get_full_network_name()
# Set hideoper on remote opers, to prevent inflating
# /lusers and various /stats
hideoper_mode = remoteirc.umodes.get('hideoper')
try:
use_hideoper = conf.conf['relay']['hideoper']
except KeyError:
use_hideoper = True
if hideoper_mode and use_hideoper:
modes.add((hideoper_mode, None))
rsid = get_relay_server_sid(remoteirc, irc)
if not rsid:
log.error('(%s) spawn_relay_user: aborting user spawn for %s/%s @ %s (failed to retrieve a '
'working SID).', irc.name, user, nick, remoteirc.name)
return
try:
showRealIP = conf.conf['relay']['show_ips'] and not \
irc.serverdata.get('relay_no_ips') and not \
remoteirc.serverdata.get('relay_no_ips')
except KeyError:
showRealIP = False
if showRealIP:
ip = userobj.ip
realhost = userobj.realhost
else:
realhost = None
ip = '0.0.0.0'
u = remoteirc.spawn_client(nick, ident=ident, host=host, realname=realname, modes=modes,
opertype=opertype, server=rsid, ip=ip, realhost=realhost).uid
try:
remoteirc.users[u].remote = (irc.name, user)
remoteirc.users[u].opertype = opertype
away = userobj.away
if away:
remoteirc.away(u, away)
except KeyError:
# User got killed somehow while we were setting options on it.
# This is probably being done by the uplink, due to something like an
# invalid nick, etc.
raise
relayusers[(irc.name, user)][remoteirc.name] = u
return u
def get_remote_user(irc, remoteirc, user, spawn_if_missing=True, times_tagged=0):
"""
Fetches and returns the relay client UID representing "user" on the remote network "remoteirc",
spawning a new user if one doesn't exist and spawn_if_missing is True.
"""
# Wait until the network is working before trying to spawn anything.
if irc.connected.is_set():
# Don't spawn clones for registered service bots.
sbot = irc.get_service_bot(user)
if sbot:
return sbot.uids.get(remoteirc.name)
log.debug('(%s) Grabbing spawnlocks[%s] from thread %r in function %r', irc.name, irc.name,
threading.current_thread().name, inspect.currentframe().f_code.co_name)
if spawnlocks[irc.name].acquire(timeout=TCONDITION_TIMEOUT):
# Be sort-of thread safe: lock the user spawns for the current net first.
u = None
try:
# Look up the existing user, stored here as dict entries in the format:
# {('ournet', 'UID'): {'remotenet1': 'UID1', 'remotenet2': 'UID2'}}
u = relayusers[(irc.name, user)][remoteirc.name]
except KeyError:
# User doesn't exist. Spawn a new one if requested.
if spawn_if_missing:
u = spawn_relay_user(irc, remoteirc, user, times_tagged=times_tagged)
# This is a sanity check to make sure netsplits and other state resets
# don't break the relayer. If it turns out there was a client in our relayusers
# cache for the requested UID, but it doesn't match the request,
# assume it was a leftover from the last split and replace it with a new one.
# XXX: this technically means that PyLink is desyncing somewhere, and that we should
# fix this in core properly...
if u and ((u not in remoteirc.users) or remoteirc.users[u].remote != (irc.name, user)):
log.warning('(%s) Possible desync? Got invalid relay UID %s for %s on %s',
irc.name, u, irc.get_friendly_name(user), remoteirc.name)
u = spawn_relay_user(irc, remoteirc, user, times_tagged=times_tagged)
spawnlocks[irc.name].release()
return u
else:
log.debug('(%s) skipping spawn_relay_user(%s, %s, %s, ...); the local server (%s) is not ready yet',
irc.name, irc.name, remoteirc.name, user, irc.name)
log.debug('(%s) spawn_relay_user: current thread is %s',
irc.name, threading.current_thread().name)
def get_orig_user(irc, user, targetirc=None):
"""
Given the UID of a relay client, returns a tuple of the home network name
and original UID of the user it was spawned for.
If targetirc is given, get_remote_user() is called to get the relay client
representing the original user on that target network."""
try:
remoteuser = irc.users[user].remote
except (AttributeError, KeyError):
remoteuser = None
log.debug('(%s) relay.get_orig_user: remoteuser set to %r (looking up %s/%s).',
irc.name, remoteuser, user, irc.name)
if remoteuser:
# If targetirc is given, we'll return simply the UID of the user on the
# target network, if it exists. Otherwise, we'll return a tuple
# with the home network name and the original user's UID.
sourceobj = world.networkobjects.get(remoteuser[0])
if targetirc and sourceobj:
if remoteuser[0] == targetirc.name:
# The user we found's home network happens to be the one being
# requested; just return the UID then.
return remoteuser[1]
# Otherwise, use get_remote_user to find our UID.
res = get_remote_user(sourceobj, targetirc, remoteuser[1],
spawn_if_missing=False)
log.debug('(%s) relay.get_orig_user: targetirc found as %s, getting %r as '
'remoteuser for %r (looking up %s/%s).', irc.name, targetirc.name,
res, remoteuser[1], user, irc.name)
return res
else:
return remoteuser
def get_relay(irc, channel):
"""Finds the matching relay entry name for the given network, channel
pair, if one exists."""
chanpair = (irc.name, irc.to_lower(channel))
if chanpair in db: # This chanpair is a shared channel; others link to it
return chanpair
# This chanpair is linked *to* a remote channel
for name, dbentry in db.items():
if chanpair in dbentry['links']:
return name
def get_remote_channel(irc, remoteirc, channel):
"""Returns the linked channel name for the given channel on remoteirc,
if one exists."""
remotenetname = remoteirc.name
chanpair = get_relay(irc, channel)
if chanpair is None:
return
if chanpair[0] == remotenetname:
return chanpair[1]
else:
for link in db[chanpair]['links']:
if link[0] == remotenetname:
return link[1]
def initialize_channel(irc, channel):
"""Initializes a relay channel (merge local/remote users, set modes, etc.)."""
# We're initializing a relay that already exists. This can be done at
# ENDBURST, or on the LINK command.
relay = get_relay(irc, channel)
log.debug('(%s) relay.initialize_channel being called on %s', irc.name, channel)
log.debug('(%s) relay.initialize_channel: relay pair found to be %s', irc.name, relay)
queued_users = []
if relay:
all_links = db[relay]['links'].copy()
all_links.update((relay,))
log.debug('(%s) relay.initialize_channel: all_links: %s', irc.name, all_links)
# Iterate over all the remote channels linked in this relay.
for link in all_links:
remotenet, remotechan = link
if remotenet == irc.name: # If the network is us, skip.
continue
remoteirc = world.networkobjects.get(remotenet)
if remoteirc is None:
# Remote network doesn't have an IRC object; e.g. it was removed
# from the config. Skip this.
continue
# Give each network a tiny bit of leeway to finish up its connection.
# This is better than just dropping users their completely.
if not remoteirc.connected.wait(TCONDITION_TIMEOUT):
continue
# Join their (remote) users and set their modes, if applicable.
if remotechan in remoteirc.channels:
rc = remoteirc.channels[remotechan]
'''
if not hasattr(rc, '_relay_initial_burst'):
rc._relay_initial_burst = threading.Event()
if rc._relay_initial_burst.is_set():
log.debug('(%s) relay.initialize_channel: skipping inbound burst from %s/%s => %s/%s '
'as it has already been bursted', irc.name, remoteirc.name, remotechan, irc.name, channel)
continue
rc._relay_initial_burst.set()
'''
relay_joins(remoteirc, remotechan, rc.users, rc.ts, targetirc=irc)
# Only update the topic if it's different from what we already have,
# and topic bursting is complete.
if rc.topicset and rc.topic != irc.channels[channel].topic:
irc.topic_burst(irc.sid, channel, rc.topic)
# Send our users and channel modes to the other nets
if channel in irc.channels:
c = irc._channels[channel]
relay_joins(irc, channel, c.users, c.ts)
if 'pylink' in world.services:
world.services['pylink'].join(irc, channel)
def remove_channel(irc, channel):
"""Destroys a relay channel by parting all of its users."""
if irc is None:
return
if channel not in map(str.lower, irc.serverdata.get('channels', [])):
world.services['pylink'].extra_channels[irc.name].discard(channel)
if irc.pseudoclient:
irc.part(irc.pseudoclient.uid, channel, 'Channel delinked.')
relay = get_relay(irc, channel)
if relay and channel in irc.channels:
for user in irc.channels[channel].users.copy():
if not is_relay_client(irc, user):
relay_part(irc, channel, user)
# Don't ever part the main client from any of its autojoin channels.
else:
if user == irc.pseudoclient.uid and channel in \
irc.serverdata.get('channels', []):
continue
irc.part(user, channel, 'Channel delinked.')
# Don't ever quit it either...
if user != irc.pseudoclient.uid and not irc.users[user].channels:
remoteuser = get_orig_user(irc, user)
del relayusers[remoteuser][irc.name]
irc.quit(user, 'Left all shared channels.')
def check_claim(irc, channel, sender, chanobj=None):
"""
Checks whether the sender of a kick/mode change passes CLAIM checks for
a given channel. This returns True if any of the following criteria are met:
1) No relay exists for the channel in question.
2) The originating network is the one that created the relay.
3) The CLAIM list for the relay in question is empty.
4) The originating network is in the CLAIM list for the relay in question.
5) The sender is halfop or above in the channel but NOT a U-line
(this is because we allow u-lines to override with ops to prevent mode floods).
6) The sender is a PyLink client/server (checks are suppressed in this case).
"""
relay = get_relay(irc, channel)
try:
mlist = chanobj.prefixmodes
except AttributeError:
mlist = None
sender_modes = get_prefix_modes(irc, irc, channel, sender, mlist=mlist)
log.debug('(%s) relay.check_claim: sender modes (%s/%s) are %s (mlist=%s)', irc.name,
sender, channel, sender_modes, mlist)
# XXX: stop hardcoding modes to check for and support mlist in isHalfopPlus and friends
return (not relay) or irc.name == relay[0] or not db[relay]['claim'] or \
irc.name in db[relay]['claim'] or \
(any([mode in sender_modes for mode in ('y', 'q', 'a', 'o', 'h')])
and not _is_uline(irc, sender)) \
or irc.is_internal_client(sender) or \
irc.is_internal_server(sender)
def get_supported_umodes(irc, remoteirc, modes):
"""Given a list of user modes, filters out all of those not supported by the
remote network."""
supported_modes = []
# Iterate over all mode pairs.
for modepair in modes:
try:
# Get the prefix and the actual mode character (the prefix being + or -, or
# whether we're setting or unsetting a mode)
prefix, modechar = modepair[0]
except ValueError:
# If the prefix is missing, assume we're adding a mode.
modechar = modepair[0]
prefix = '+'
# Get the mode argument.
arg = modepair[1]
# Iterate over all supported user modes for the current network.
for name, m in irc.umodes.items():
if name.startswith('*'):
# XXX: Okay, we need a better place to store modetypes.
continue
supported_char = None
# Mode character matches one in our list, so set that named mode
# as the one we're trying to set. Then, look up that named mode
# in the supported modes list for the TARGET network, and set that
# mode character as the one we're setting, if it exists.
if modechar == m:
if name not in WHITELISTED_UMODES:
log.debug("(%s) relay.get_supported_umodes: skipping mode (%r, %r) because "
"it isn't a whitelisted (safe) mode for relay.",
irc.name, modechar, arg)
break
supported_char = remoteirc.umodes.get(name)
if supported_char:
supported_modes.append((prefix+supported_char, arg))
break
else:
log.debug("(%s) relay.get_supported_umodes: skipping mode (%r, %r) because "
"the remote network (%s)'s IRCd (%s) doesn't support it.",
irc.name, modechar, arg, remoteirc.name,
remoteirc.protoname)
return supported_modes
def is_relay_client(irc, user):
"""Returns whether the given user is a relay client."""
try:
if irc.users[user].remote:
# Is the .remote attribute set? If so, don't relay already
# relayed clients; that'll trigger an endless loop!
return True
except AttributeError: # Nope, it isn't.
pass
except KeyError: # The user doesn't exist?!?
return True
return False
isRelayClient = is_relay_client
def iterate_all(origirc, func, extra_args=(), kwargs=None):
"""
Runs the given function 'func' on all connected networks. 'func' must take at least two arguments: the original network object and the remote network object.
"""
if kwargs is None:
kwargs = {}
for name, remoteirc in world.networkobjects.copy().items():
if name == origirc.name or not remoteirc.connected.is_set():
# Don't relay things to their source network...
continue
func(origirc, remoteirc, *extra_args, **kwargs)
def iterate_all_present(origirc, origuser, func, extra_args=(), kwargs=None):
"""
Runs the given function 'func' on all networks where the UID 'origuser'
from 'origirc' has a relay client.
'func' must take at least three arguments: the original network object,
the remote network object, and the UID on the remote network to work on.
"""
if kwargs is None:
kwargs = {}
for netname, user in relayusers[(origirc.name, origuser)].copy().items():
remoteirc = world.networkobjects[netname]
func(origirc, remoteirc, user, *extra_args, **kwargs)
### EVENT HANDLER INTERNALS
def relay_joins(irc, channel, users, ts, targetirc=None, **kwargs):
"""
Relays one or more users' joins from a channel to its relay links. If targetirc is given, only burst
to that specific network.
"""
if ts < 750000:
current_ts = int(time.time())
log.debug('(%s) relay: resetting too low TS value of %s on %s to %s', irc.name, ts, users, current_ts)
ts = current_ts
def _relay_joins_loop(irc, remoteirc, channel, users, ts, burst=True):
queued_users = []
remotechan = get_remote_channel(irc, remoteirc, channel)
if remotechan is None:
# If there is no link on the current network for the channel in question,
# just skip it.
return
for user in users.copy():
if is_relay_client(irc, user):
# Don't clone relay clients; that'll cause bad infinite loops.
continue
assert user in irc.users, "(%s) relay.relay_joins: How is this possible? %r isn't in our user database." % (irc.name, user)
u = get_remote_user(irc, remoteirc, user)
if not u:
continue
if (remotechan not in remoteirc.channels) or u not in remoteirc.channels[remotechan].users:
# Note: only join users if they aren't already joined. This prevents op floods
# on charybdis from repeated SJOINs sent for one user.
# Fetch the known channel TS and all the prefix modes for each user. This ensures
# the different sides of the relay are merged properly.
if not irc.has_cap('has-ts'):
# Special hack for clientbot: just use the remote's modes so mode changes
# take precendence. (TS is always outside the clientbot's control)
if remotechan in remoteirc.channels:
ts = remoteirc.channels[remotechan].ts
else:
ts = int(time.time())
else:
ts = irc.channels[channel].ts
prefixes = get_prefix_modes(irc, remoteirc, channel, user)
# proto.sjoin() takes its users as a list of (prefix mode characters, UID) pairs.
userpair = (prefixes, u)
queued_users.append(userpair)
if queued_users:
# Look at whether we should relay this join as a regular JOIN, or a SJOIN.
# SJOIN will be used if either the amount of users to join is > 1, or there are modes
# to be set on the joining user.
rsid = get_relay_server_sid(remoteirc, irc)
if burst or len(queued_users) > 1 or queued_users[0][0]:
modes = get_supported_cmodes(irc, remoteirc, channel, irc.channels[channel].modes)
# Subtract any mode delta modes from this burst
relay = db[get_relay(irc, channel)]
modedelta_modes = relay.get('modedelta')
if modedelta_modes:
# Check if the target is a leaf channel: if so, add the mode delta modes to the target channel.
# Otherwise, subtract this set of modes, as we don't want these modes from leaves to be sent back
# to the original channel.
adding = (remoteirc.name, remotechan) in relay['links']
# Add this to the SJOIN mode list.
for mode in modedelta_modes:
modechar = remoteirc.cmodes.get(mode[0])
if modechar:
if modechar in remoteirc.cmodes['*A'] or modechar in remoteirc.prefixmodes:
log.warning('(%s) Refusing to set modedelta mode %r on %s because it is a list or prefix mode',
irc.name, modechar, channel)
continue
elif not remoteirc.has_cap('can-spawn-clients'):
log.debug('(%s) relay.handle_mode: Not enforcing modedelta modes on bot-only network %s',
irc.name, remoteirc.name)
continue
modedelta_mode = ('+%s' % modechar, mode[1])
if adding:
log.debug('(%s) relay.relay_joins: adding %r on %s/%s (modedelta)', irc.name,
str(modedelta_mode), remoteirc.name, remotechan)
modes.append(modedelta_mode)
elif modedelta_mode in modes:
log.debug('(%s) relay.relay_joins: removing %r on %s/%s (modedelta)', irc.name,
str(modedelta_mode), remoteirc.name, remotechan)
modes.remove(modedelta_mode)
if rsid:
remoteirc.sjoin(rsid, remotechan, queued_users, ts=ts, modes=modes)
else:
# A regular JOIN only needs the user and the channel. TS, source SID, etc., can all be omitted.
remoteirc.join(queued_users[0][1], remotechan)
remoteirc.call_hooks([rsid, 'PYLINK_RELAY_JOIN', {'channel': remotechan, 'users': [u[-1] for u in queued_users]}])
if targetirc:
_relay_joins_loop(irc, targetirc, channel, users, ts, **kwargs)
else:
iterate_all(irc, _relay_joins_loop, extra_args=(channel, users, ts), kwargs=kwargs)
def relay_part(irc, *args, **kwargs):
"""
Relays a user part from a channel to its relay links, as part of a channel delink.
"""
def _relay_part_loop(irc, remoteirc, channel, user):
remotechan = get_remote_channel(irc, remoteirc, channel)
log.debug('(%s) relay.relay_part: looking for %s/%s on %s', irc.name, user, irc.name, remoteirc.name)
log.debug('(%s) relay.relay_part: remotechan found as %s', irc.name, remotechan)
remoteuser = get_remote_user(irc, remoteirc, user, spawn_if_missing=False)
log.debug('(%s) relay.relay_part: remoteuser for %s/%s found as %s', irc.name, user, irc.name, remoteuser)
if remotechan is None or remoteuser is None:
# If there is no relay channel on the target network, or the relay
# user doesn't exist, just do nothing.
return
# Part the relay client with the channel delinked message.
remoteirc.part(remoteuser, remotechan, 'Channel delinked.')
# If the relay client no longer has any channels, quit them to prevent inflating /lusers.
if is_relay_client(remoteirc, remoteuser) and not remoteirc.users[remoteuser].channels:
remoteirc.quit(remoteuser, 'Left all shared channels.')
del relayusers[(irc.name, user)][remoteirc.name]
iterate_all(irc, _relay_part_loop, extra_args=args, kwargs=kwargs)
WHITELISTED_CMODES = {
'admin',
'adminonly',
'allowinvite',
'autoop',
'ban',
'banexception',
'blockcolor',
'blockcaps',
'blockhighlight',
'exemptchanops',
'filter',
'flood',
'flood_unreal',
'freetarget',
'halfop',
'hidequits',
'history',
'invex',
'inviteonly',
'joinflood',
'key',
'kicknorejoin',
'kicknorejoin_insp',
'largebanlist',
'limit',
'moderated',
'nickflood',
'noamsg',
'noctcp',
'noextmsg',
'noforwards',
'noinvite',
'nokick',
'noknock',
'nonick',
'nonotice',
'op',
'operonly',
'opmoderated',
'owner',
'private',
'quiet',
'regmoderated',
'regonly',
'repeat',
'repeat_insp',
'secret',
'sslonly',
'stripcolor',
'topiclock',
'voice'
}
WHITELISTED_UMODES = {
'bot',
'hidechans',
'hideidle',
'hideoper',
'invisible',
'noctcp',
'oper',
'regdeaf',
'stripcolor',
'wallops'
}
CLIENTBOT_WHITELISTED_UMODES = {'admin', 'ban', 'banexception', 'halfop', 'invex', 'op', 'owner', 'voice'}
CLIENTBOT_MODESYNC_OPTIONS = ('none', 'half', 'full')
def get_supported_cmodes(irc, remoteirc, channel, modes):
"""
Filters a channel mode change to the modes supported by the target IRCd.
"""
remotechan = get_remote_channel(irc, remoteirc, channel)
if not remotechan: # Not a relay channel
return []
# Handle Clientbot-specific mode whitelist settings
whitelist = WHITELISTED_CMODES
if remoteirc.protoname == 'clientbot' or irc.protoname == 'clientbot':
modesync = conf.conf.get('relay', {}).get('clientbot_modesync', 'none').lower()
if modesync not in CLIENTBOT_MODESYNC_OPTIONS:
modesync = 'none'
log.warning('relay: Bad clientbot_modesync option %s: valid values are %s',
modesync, CLIENTBOT_MODESYNC_OPTIONS)
if modesync == 'none':
return [] # Do nothing
elif modesync == 'half':
whitelist = CLIENTBOT_WHITELISTED_UMODES
supported_modes = []
for modepair in modes:
try:
prefix, modechar = modepair[0]
except ValueError:
modechar = modepair[0]
prefix = '+'
arg = modepair[1]
# Iterate over every mode see whether the remote IRCd supports
# this mode, and what its mode char for it is (if it is different).
for name, m in irc.cmodes.items():
mode_parse_aborted = False
if name.startswith('*'):
# XXX: Okay, we need a better place to store modetypes.
continue
if modechar == m:
if name not in whitelist:
log.debug("(%s) relay.get_supported_cmodes: skipping mode (%r, %r) because "
"it isn't a whitelisted (safe) mode for relay.",
irc.name, modechar, arg)
break
supported_char = remoteirc.cmodes.get(name)
# The mode we requested is an acting extban on the target network.
# Basically there are 3 possibilities when handling these extban-like modes:
# 1) Both target & source both use a chmode (e.g. ts6 +q). In these cases, the mode is just forwarded as-is.
# 2) Forwarding from chmode to extban - this is the case being handled here.
# 3) Forwarding from extban to extban (see below)
pending_extban_prefixes = []
if name in remoteirc.extbans_acting:
# We make the assumption that acting extbans can only be used with +b...
old_arg = arg
supported_char = remoteirc.cmodes['ban']
pending_extban_prefixes.append(name) # Save the extban prefix for joining later
log.debug('(%s) relay.get_supported_cmodes: folding mode %s%s %s to %s%s %s%s for %s',
irc.name, prefix, modechar, old_arg, prefix, supported_char,
remoteirc.extbans_acting[name], arg, remoteirc.name)
elif supported_char is None:
continue
if modechar in irc.prefixmodes:
# This is a prefix mode (e.g. +o). We must coerse the argument
# so that the target exists on the remote relay network.
log.debug("(%s) relay.get_supported_cmodes: coersing argument of (%r, %r) "
"for network %r.",
irc.name, modechar, arg, remoteirc.name)
if (not irc.has_cap('can-spawn-clients')) and irc.pseudoclient and arg == irc.pseudoclient.uid:
# Skip modesync on the main PyLink client.
log.debug("(%s) relay.get_supported_cmodes: filtering prefix change (%r, %r) on Clientbot relayer",
irc.name, name, arg)
break
# If the target is a remote user, get the real target
# (original user).
arg = get_orig_user(irc, arg, targetirc=remoteirc) or \
get_remote_user(irc, remoteirc, arg, spawn_if_missing=False)
if arg is None:
# Relay client for target user doesn't exist yet. Drop the mode.
break
log.debug("(%s) relay.get_supported_cmodes: argument found as (%r, %r) "
"for network %r.",
irc.name, modechar, arg, remoteirc.name)
oplist = []
if remotechan in remoteirc.channels:
oplist = remoteirc.channels[remotechan].prefixmodes[name]
log.debug("(%s) relay.get_supported_cmodes: list of %ss on %r is: %s",
irc.name, name, remotechan, oplist)
if prefix == '+' and arg in oplist:
# Don't set prefix modes that are already set.
log.debug("(%s) relay.get_supported_cmodes: skipping setting %s on %s/%s because it appears to be already set.",
irc.name, name, arg, remoteirc.name)
break
elif arg:
# Acting extban case 3: forwarding extban -> extban or mode
# First, we expand extbans from the local IRCd into a named mode and argument pair. Then, we
# can figure out how to relay it.
for extban_name, extban_prefix in irc.extbans_acting.items():
# Acting extbans are only supported with +b (e.g. +b m:n!u@h)
if name == 'ban' and arg.startswith(extban_prefix):
orig_supported_char, old_arg = supported_char, arg
if extban_name in remoteirc.cmodes:
# This extban is a mode on the target network. Chop off the extban prefix and set
# the mode character to the target's mode for it.
supported_char = remoteirc.cmodes[extban_name]
arg = arg[len(extban_prefix):]
log.debug('(%s) relay.get_supported_cmodes: expanding acting extban %s%s %s to %s%s %s for %s',
irc.name, prefix, orig_supported_char, old_arg, prefix,
supported_char, arg, remoteirc.name)
# Override the mode name so that we're not overly strict about nick!user@host
# conformance. Note: the reverse (cmode->extban) is not done because that would
# also trigger the nick!user@host filter for +b.
name = extban_name
elif extban_name in remoteirc.extbans_acting:
# This is also an extban on the target network.
# Just chop off the local prefix now; we rewrite it later after processing
# any matching extbans.
pending_extban_prefixes.append(extban_name)
arg = arg[len(extban_prefix):]
log.debug('(%s) relay.get_supported_cmodes: expanding acting extban %s%s %s to %s%s %s%s for %s',
irc.name, prefix, orig_supported_char, old_arg, prefix,
supported_char, remoteirc.extbans_acting[extban_name], arg,
remoteirc.name)
else:
# This mode/extban isn't supported, so ignore it.
log.debug('(%s) relay.get_supported_cmodes: blocking acting extban '
'%s%s %s as target %s doesn\'t support it',
irc.name, prefix, supported_char, arg, remoteirc.name)
mode_parse_aborted = True # XXX: nested loops are ugly...
break # Only one extban per mode pair, so break.
# Handle matching extbans such as Charybdis $a, UnrealIRCd ~a, InspIRCd R:, etc.
for extban_name, extban_prefix in irc.extbans_matching.items():
# For matching extbans, we check for the following:
# 1) arg == extban, for extbans like Charybdis $o and $a that are valid without an argument.
# 2) arg starting with extban, the most general case.
# Extbans with and without args have different mode names to prevent ambiguity and
# allow proper forwarding.
old_arg = arg
if arg == extban_prefix:
# This is a matching extban with no arg (case 1).
if extban_name in remoteirc.extbans_matching:
# Replace the ban with the remote's version entirely.
arg = remoteirc.extbans_matching[extban_name]
log.debug('(%s) relay.get_supported_cmodes: mangling static matching extban %s => %s for %s',
irc.name, old_arg, arg, remoteirc.name)
break
else:
# Unsupported, don't forward it.
log.debug("(%s) relay.get_supported_cmodes: setting mode_parse_aborted as (%r, %r) "
"(name=%r; extban_name=%r) doesn't match any (static) extban on %s",
irc.name, supported_char, arg, name, extban_name, remoteirc.name)
mode_parse_aborted = True
elif extban_prefix.endswith(':') and arg.startswith(extban_prefix):
# This is a full extban with a prefix and some data. The assumption: all extbans with data
# have a prefix ending with : (as a delimiter)
if extban_name in remoteirc.extbans_matching:
# Chop off our prefix and apply the remote's.
arg = arg[len(extban_prefix):]
arg = remoteirc.extbans_matching[extban_name] + arg
log.debug('(%s) relay.get_supported_cmodes: mangling matching extban arg %s => %s for %s',
irc.name, old_arg, arg, remoteirc.name)
break
else:
log.debug("(%s) relay.get_supported_cmodes: setting mode_parse_aborted as (%r, %r) "
"(name=%r; extban_name=%r) doesn't match any (dynamic) extban on %s",
irc.name, supported_char, arg, name, extban_name, remoteirc.name)
mode_parse_aborted = True
else:
if name in ('ban', 'banexception', 'invex', 'quiet') and not remoteirc.is_hostmask(arg):
# Don't add unsupported bans that don't match n!u@h syntax.
log.debug("(%s) relay.get_supported_cmodes: skipping unsupported extban/mode (%r, %r) "
"because it doesn't match nick!user@host. (name=%r)",
irc.name, supported_char, arg, name)
break
# We broke up an acting extban earlier. Now, rewrite it into a new mode by joining the prefix and data together.
while pending_extban_prefixes:
next_prefix = pending_extban_prefixes.pop()
log.debug("(%s) relay.get_supported_cmodes: readding extban prefix %r (%r) to (%r, %r) for %s",
irc.name, next_prefix, remoteirc.extbans_acting[next_prefix],
supported_char, arg, remoteirc.name)
arg = remoteirc.extbans_acting[next_prefix] + arg
if mode_parse_aborted:
log.debug("(%s) relay.get_supported_cmodes: blocking unsupported extban/mode (%r, %r) for %s (mode_parse_aborted)",
irc.name, supported_char, arg, remoteirc.name)
break
final_modepair = (prefix+supported_char, arg)
# Don't set modes that are already set, to prevent floods on TS6
# where the same mode can be set infinite times.
if prefix == '+' and (remotechan not in remoteirc.channels or final_modepair in remoteirc.channels[remotechan].modes):
log.debug("(%s) relay.get_supported_cmodes: skipping setting mode (%r, %r) on %s%s because it appears to be already set.",
irc.name, supported_char, arg, remoteirc.name, remotechan)
break
supported_modes.append(final_modepair)
log.debug("(%s) relay.get_supported_cmodes: added modepair (%r, %r) for %s%s",
irc.name, supported_char, arg, remoteirc.name, remotechan)
break
log.debug('(%s) relay.get_supported_cmodes: final modelist (sending to %s%s) is %s', irc.name, remoteirc.name, remotechan, supported_modes)
return supported_modes
### EVENT HANDLERS
def handle_relay_whois(irc, source, command, args):
"""
WHOIS handler for the relay plugin.
"""
target = args['target']
server = args['server']
targetuser = irc.users[target]
def wreply(num, text):
"""Convenience wrapper to return WHOIS replies."""
# WHOIS replies are by convention prefixed with the target user's nick.
text = '%s %s' % (targetuser.nick, text)
irc.numeric(server, num, source, text)
def _check_send_key(infoline):
"""
Returns whether we should send the given info line in WHOIS. This validates the
corresponding configuration option for being either "all" or "opers"."""
setting = conf.conf.get('relay', {}).get(infoline, '').lower()
if setting == 'all':
return True
elif setting == 'opers' and irc.is_oper(source, allowAuthed=False):
return True
return False
# Get the real user for the WHOIS target.
origuser = get_orig_user(irc, target)
if origuser:
homenet, uid = origuser
realirc = world.networkobjects[homenet]
realuser = realirc.users[uid]
netname = realirc.get_full_network_name()
wreply(320, ":is a remote user connected via PyLink Relay. Home network: %s; "
"Home nick: %s" % (netname, realuser.nick))
if _check_send_key('whois_show_accounts') and realuser.services_account:
# Send account information if told to and the target is logged in.
wreply(330, "%s :is logged in (on %s) as" % (realuser.services_account, netname))
if _check_send_key('whois_show_server') and realirc.has_cap('can-track-servers'):
wreply(320, ":is actually connected via the following server:")
realserver = realirc.get_server(uid)
realserver = realirc.servers[realserver]
wreply(312, "%s :%s" % (realserver.name, realserver.desc))
utils.add_hook(handle_relay_whois, 'PYLINK_CUSTOM_WHOIS')
def handle_operup(irc, numeric, command, args):
"""
Handles setting oper types on relay clients during oper up.
"""
newtype = '%s (on %s)' % (args['text'], irc.get_full_network_name())
def _handle_operup_func(irc, remoteirc, user):
log.debug('(%s) relay.handle_opertype: setting OPERTYPE of %s/%s to %s',
irc.name, user, remoteirc.name, newtype)
remoteirc.users[user].opertype = newtype
iterate_all_present(irc, numeric, _handle_operup_func)
utils.add_hook(handle_operup, 'CLIENT_OPERED')
def handle_join(irc, numeric, command, args):
channel = args['channel']
if not get_relay(irc, channel):
# No relay here, return.
return
ts = args['ts']
users = set(args['users'])
claim_passed = check_claim(irc, channel, numeric)
current_chandata = irc.channels.get(channel)
chandata = args.get('channeldata')
log.debug('(%s) relay.handle_join: claim for %s on %s: %s', irc.name, numeric, channel, claim_passed)
log.debug('(%s) relay.handle_join: old channel data %s', irc.name, chandata)
log.debug('(%s) relay.handle_join: current channel data %s', irc.name, current_chandata)
if chandata and not claim_passed:
# If the server we're receiving an SJOIN from isn't in the claim list, undo ALL attempts
# from it to burst modes.
# This option can prevent things like /OJOIN abuse or split riding with oper override, but
# has the side effect of causing all prefix modes on leaf links to be lost when networks
# split and rejoin.
modes = []
for user in users:
# XXX: Find the diff of the new and old mode lists of the channel. Not pretty, but I'd
# rather not change the 'users' format of SJOIN just for this. -GL
try:
oldmodes = set(chandata.get_prefix_modes(user))
except KeyError:
# User was never in channel. Treat their mode list as empty.
oldmodes = set()
newmodes = set()
if current_chandata is not None:
newmodes = set(current_chandata.get_prefix_modes(user))
modediff = newmodes - oldmodes
log.debug('(%s) relay.handle_join: mode diff for %s on %s: %s oldmodes=%s newmodes=%s',
irc.name, user, channel, modediff, oldmodes, newmodes)
for modename in modediff:
modechar = irc.cmodes.get(modename)
# Special case for U-lined servers: allow them to join with ops,
# but don't forward this mode change on.
if modechar and not _is_uline(irc, numeric):
modes.append(('-%s' % modechar, user))
if modes:
log.debug('(%s) relay.handle_join: reverting modes on BURST: %s', irc.name, irc.join_modes(modes))
irc.mode(irc.sid, channel, modes)
relay_joins(irc, channel, users, ts, burst=False)
utils.add_hook(handle_join, 'JOIN')
utils.add_hook(handle_join, 'PYLINK_SERVICE_JOIN')
def handle_quit(irc, numeric, command, args):
# Lock the user spawning mechanism before proceeding, since we're going to be
# deleting client from the relayusers cache.
log.debug('(%s) Grabbing spawnlocks[%s] from thread %r in function %r', irc.name, irc.name,
threading.current_thread().name, inspect.currentframe().f_code.co_name)
if spawnlocks[irc.name].acquire(timeout=TCONDITION_TIMEOUT):
def _handle_quit_func(irc, remoteirc, user):
try: # Try to quit the client. If this fails because they're missing, bail.
remoteirc.quit(user, args['text'])
except LookupError:
pass
iterate_all_present(irc, numeric, _handle_quit_func)
del relayusers[(irc.name, numeric)]
spawnlocks[irc.name].release()
utils.add_hook(handle_quit, 'QUIT')
def handle_squit(irc, numeric, command, args):
"""
Handles SQUITs over relay.
"""
users = args['users']
target = args['target']
# Someone /SQUIT one of our relay subservers. Bad! Rejoin them!
if target in relayservers[irc.name].values():
sname = args['name']
remotenet = sname.split('.', 1)[0]
del relayservers[irc.name][remotenet]
for userpair in relayusers:
if userpair[0] == remotenet and irc.name in relayusers[userpair]:
del relayusers[userpair][irc.name]
remoteirc = world.networkobjects[remotenet]
initialize_all(remoteirc)
else:
# Some other netsplit happened on the network, we'll have to fake
# some *.net *.split quits for that.
for user in users:
log.debug('(%s) relay.handle_squit: sending handle_quit on %s', irc.name, user)
try: # Allow netsplit hiding to be toggled
show_splits = conf.conf['relay']['show_netsplits']
except KeyError:
show_splits = False
text = '*.net *.split'
if show_splits:
uplink = args['uplink']
try:
text = '%s %s' % (irc.servers[uplink].name, args['name'])
except (KeyError, AttributeError):
log.warning("(%s) relay.handle_squit: Failed to get server name for %s",
irc.name, uplink)
handle_quit(irc, user, command, {'text': text})
utils.add_hook(handle_squit, 'SQUIT')
def handle_nick(irc, numeric, command, args):
newnick = args['newnick']
def _handle_nick_func(irc, remoteirc, user):
remote_newnick = normalize_nick(remoteirc, irc.name, newnick, uid=user)
if remoteirc.users[user].nick != remote_newnick:
remoteirc.nick(user, remote_newnick)
iterate_all_present(irc, numeric, _handle_nick_func)
utils.add_hook(handle_nick, 'NICK')
def handle_part(irc, numeric, command, args):
channels = args['channels']
text = args['text']
# Don't allow the PyLink client PARTing to be relayed.
if numeric == irc.pseudoclient.uid:
# For clientbot: treat forced parts to the bot as clearchan, and attempt to rejoin only
# if it affected a relay.
if not irc.has_cap('can-spawn-clients'):
for channel in [c for c in channels if get_relay(irc, c)]:
for user in irc.channels[channel].users.copy():
if (not irc.is_internal_client(user)) and (not is_relay_client(irc, user)):
irc.call_hooks([irc.sid, 'CLIENTBOT_SERVICE_KICKED', {'channel': channel, 'target': user,
'text': 'Clientbot was force parted (Reason: %s)' % text or 'None',
'parse_as': 'KICK'}])
irc.join(irc.pseudoclient.uid, channel)
return
return
for channel in channels:
def _handle_part_loop(irc, remoteirc, user):
remotechan = get_remote_channel(irc, remoteirc, channel)
if remotechan is None:
return
remoteirc.part(user, remotechan, text)
if not remoteirc.users[user].channels:
remoteirc.quit(user, 'Left all shared channels.')
del relayusers[(irc.name, numeric)][remoteirc.name]
iterate_all_present(irc, numeric, _handle_part_loop)
utils.add_hook(handle_part, 'PART')
def _get_lowest_prefix(prefixes):
if not prefixes:
return ''
for prefix in 'vhoayq':
if prefix in prefixes:
return prefix
else:
log.warning('relay._get_lowest_prefix: unknown prefixes string %r', prefixes)
return ''
def handle_messages(irc, numeric, command, args):
command = command.upper()
notice = 'NOTICE' in command or command.startswith('WALL')
target = args['target']
text = args['text']
if irc.is_internal_client(numeric) and irc.is_internal_client(target):
# Drop attempted PMs between internal clients (this shouldn't happen,
# but whatever).
return
elif (numeric in irc.servers) and (not notice):
log.debug('(%s) relay.handle_messages: dropping PM from server %s to %s',
irc.name, numeric, target)
return
relay = get_relay(irc, target)
remoteusers = relayusers[(irc.name, numeric)]
avail_prefixes = {v: k for k, v in irc.prefixmodes.items()}
prefixes = []
# Split up @#channel prefixes and the like into their prefixes and target components
while target and target[0] in avail_prefixes:
prefixes.append(avail_prefixes[target[0]])
target = target[1:]
log.debug('(%s) relay.handle_messages: splitting target %r into prefixes=%r, target=%r',
irc.name, args['target'], prefixes, target)
if irc.is_channel(target):
def _handle_messages_loop(irc, remoteirc, numeric, command, args, notice,
target, text, msgprefixes):
real_target = get_remote_channel(irc, remoteirc, target)
# Don't relay anything back to the source net, or to disconnected networks
# and networks without a relay for this channel.
if (not real_target) or (not irc.connected.is_set()):
return
orig_msgprefixes = msgprefixes
# Filter @#channel prefixes by what's available on the target network
msgprefixes = list(filter(lambda p: p in remoteirc.prefixmodes, msgprefixes))
log.debug("(%s) relay: filtering message prefixes for %s%s from %s to %s",
irc.name, remoteirc.name, real_target, orig_msgprefixes,
msgprefixes)
# If we originally had message prefixes but ended with none,
# assume that we don't have a place to forward the message and drop it.
# One exception though is that %#channel implies @#channel.
if orig_msgprefixes and not msgprefixes:
if 'h' in orig_msgprefixes:
msgprefixes.append('o')
else:
log.debug("(%s) relay: dropping message for %s%s, orig_prefixes=%r since "
"prefixes were empty after filtering.", irc.name,
remoteirc.name, real_target, orig_msgprefixes)
return
# This bit of filtering exists because some IRCds let you do /msg ~@#channel
# and such, despite its redundancy. (This is equivalent to @#channel AFAIK)
lowest_msgprefix = _get_lowest_prefix(msgprefixes)
lowest_msgprefix = remoteirc.prefixmodes.get(lowest_msgprefix, '')
real_target = lowest_msgprefix + real_target
user = get_remote_user(irc, remoteirc, numeric, spawn_if_missing=False)
if not user:
if not (irc.serverdata.get('relay_weird_senders',
conf.conf.get('relay', {}).get('accept_weird_senders', True))):
log.debug("(%s) Dropping message for %s from user-less sender %s", irc.name,
real_target, numeric)
return
# No relay clone exists for the sender; route the message through our
# main client (or SID for notices).
# Skip "from:" formatting for servers; it's messy with longer hostnames.
# Also skip this formatting for servicebot relaying.
if numeric not in irc.servers and not irc.get_service_bot(numeric):
displayedname = irc.get_friendly_name(numeric)
real_text = '<%s/%s> %s' % (displayedname, irc.name, text)
else:
real_text = text
# XXX: perhaps consider routing messages from the server where
# possible - most IRCds except TS6 (charybdis, ratbox, hybrid)
# allow this.
try:
user = get_relay_server_sid(remoteirc, irc, spawn_if_missing=False) \
if notice else remoteirc.pseudoclient.uid
if not user:
return
except AttributeError:
# Remote main client hasn't spawned yet. Drop the message.
return
else:
if remoteirc.pseudoclient.uid not in remoteirc.users:
# Remote UID is ghosted, drop message.
return
else:
real_text = text
log.debug('(%s) relay.handle_messages: sending message to %s from %s on behalf of %s',
irc.name, real_target, user, numeric)
if real_target.startswith(tuple(irc.prefixmodes.values())) and not \
remoteirc.has_cap('has-statusmsg'):
log.debug("(%s) Not sending message destined to %s/%s because "
"the remote does not support STATUSMSG.", irc.name,
remoteirc.name, real_target)
return
try:
if notice:
remoteirc.notice(user, real_target, real_text)
else:
remoteirc.message(user, real_target, real_text)
except LookupError:
# Our relay clone disappeared while we were trying to send the message.
# This is normally due to a nick conflict with the IRCd.
log.warning("(%s) relay: Relay client %s on %s was killed while "
"trying to send a message through it!", irc.name,
remoteirc.name, user)
return
iterate_all(irc, _handle_messages_loop,
extra_args=(numeric, command, args, notice, target, text, prefixes))
else:
# Get the real user that the PM was meant for
origuser = get_orig_user(irc, target)
if origuser is None: # Not a relay client, return
return
homenet, real_target = origuser
# For PMs, we must be on a common channel with the target.
# Otherwise, the sender doesn't have a client representing them
# on the remote network, and we won't have anything to send our
# messages from.
if homenet not in remoteusers.keys():
irc.msg(numeric, 'You must be in a common channel '
'with %r in order to send messages.' % \
irc.users[target].nick, notice=True)
return
remoteirc = world.networkobjects[homenet]
if (not remoteirc.has_cap('can-spawn-clients')) and not conf.conf.get('relay', {}).get('allow_clientbot_pms'):
irc.msg(numeric, 'Private messages to users connected via Clientbot have '
'been administratively disabled.', notice=True)
return
user = get_remote_user(irc, remoteirc, numeric, spawn_if_missing=False)
try:
if notice:
remoteirc.notice(user, real_target, text)
else:
remoteirc.message(user, real_target, text)
except LookupError:
# Our relay clone disappeared while we were trying to send the message.
# This is normally due to a nick conflict with the IRCd.
log.warning("(%s) relay: Relay client %s on %s was killed while "
"trying to send a message through it!", irc.name,
remoteirc.name, user)
return
for cmd in ('PRIVMSG', 'NOTICE', 'PYLINK_SELF_NOTICE', 'PYLINK_SELF_PRIVMSG'):
utils.add_hook(handle_messages, cmd, priority=500)
def handle_kick(irc, source, command, args):
channel = args['channel']
target = args['target']
text = args['text']
kicker = source
relay = get_relay(irc, channel)
# Special case for clientbot: treat kicks to the PyLink service bot as channel clear.
if (not irc.has_cap('can-spawn-clients')) and irc.pseudoclient and target == irc.pseudoclient.uid:
for user in irc.channels[channel].users:
if (not irc.is_internal_client(user)) and (not is_relay_client(irc, user)):
reason = "Clientbot kicked by %s (Reason: %s)" % (irc.get_friendly_name(source), text)
irc.call_hooks([irc.sid, 'CLIENTBOT_SERVICE_KICKED', {'channel': channel, 'target': user,
'text': reason, 'parse_as': 'KICK'}])
return
# Don't relay kicks to protected service bots.
if relay is None or irc.get_service_bot(target):
return
origuser = get_orig_user(irc, target)
def _handle_kick_loop(irc, remoteirc, source, command, args):
remotechan = get_remote_channel(irc, remoteirc, channel)
name = remoteirc.name
log.debug('(%s) relay.handle_kick: remotechan for %s on %s is %s', irc.name, channel, name, remotechan)
if remotechan is None:
return
real_kicker = get_remote_user(irc, remoteirc, kicker, spawn_if_missing=False)
log.debug('(%s) relay.handle_kick: real kicker for %s on %s is %s', irc.name, kicker, name, real_kicker)
if not is_relay_client(irc, target):
log.debug('(%s) relay.handle_kick: target %s is NOT an internal client', irc.name, target)
# Both the target and kicker are external clients; i.e.
# they originate from the same network. We won't have
# to filter this; the uplink IRCd will handle it appropriately,
# and we'll just follow.
real_target = get_remote_user(irc, remoteirc, target, spawn_if_missing=False)
log.debug('(%s) relay.handle_kick: real target for %s is %s', irc.name, target, real_target)
else:
log.debug('(%s) relay.handle_kick: target %s is an internal client, going to look up the real user', irc.name, target)
real_target = get_orig_user(irc, target, targetirc=remoteirc)
if not real_target:
return
# Propogate the kick!
if real_kicker:
log.debug('(%s) relay.handle_kick: Kicking %s from channel %s via %s on behalf of %s/%s', irc.name, real_target, remotechan,real_kicker, kicker, irc.name)
remoteirc.kick(real_kicker, remotechan, real_target, args['text'])
else:
# Kick originated from a server, or the kicker isn't in any
# common channels with the target relay network.
rsid = get_relay_server_sid(remoteirc, irc)
log.debug('(%s) relay.handle_kick: Kicking %s from channel %s via %s on behalf of %s/%s', irc.name, real_target, remotechan, rsid, kicker, irc.name)
if not irc.has_cap('can-spawn-clients'):
# Special case for clientbot: no kick prefixes are needed.
text = args['text']
else:
try:
if kicker in irc.servers:
kname = irc.servers[kicker].name
else:
kname = irc.users.get(kicker).nick
text = "(%s/%s) %s" % (kname, irc.name, args['text'])
except AttributeError:
text = "(<unknown kicker>@%s) %s" % (irc.name, args['text'])
rsid = rsid or remoteirc.sid # Fall back to the main PyLink SID if get_relay_server_sid() fails
remoteirc.kick(rsid, remotechan, real_target, text)
# If the target isn't on any channels, quit them.
if remoteirc != irc and (not remoteirc.users[real_target].channels) and not origuser:
del relayusers[(irc.name, target)][remoteirc.name]
remoteirc.quit(real_target, 'Left all shared channels.')
if is_relay_client(irc, target) and not check_claim(irc, channel, kicker):
homenet, real_target = get_orig_user(irc, target)
homeirc = world.networkobjects.get(homenet)
homenick = homeirc.users[real_target].nick if homeirc else '<ghost user>'
homechan = get_remote_channel(irc, homeirc, channel)
log.debug('(%s) relay.handle_kick: kicker %s is not opped... We should rejoin the target user %s', irc.name, kicker, real_target)
# Home network is not in the channel's claim AND the kicker is not
# opped. We won't propograte the kick then.
# TODO: make the check slightly more advanced: i.e. halfops can't
# kick ops, admins can't kick owners, etc.
modes = get_prefix_modes(homeirc, irc, homechan, real_target)
# Join the kicked client back with its respective modes.
irc.sjoin(irc.sid, channel, [(modes, target)])
if kicker in irc.users:
log.info('(%s) relay: Blocked KICK (reason %r) from %s/%s to %s/%s on %s.',
irc.name, args['text'], irc.users[source].nick, irc.name,
homenick, homenet, channel)
irc.msg(kicker, "This channel is claimed; your kick to "
"%s has been blocked because you are not "
"(half)opped." % channel, notice=True)
else:
log.info('(%s) relay: Blocked KICK (reason %r) from server %s to %s/%s on %s.',
irc.name, args['text'], irc.servers[source].name ,
homenick, homenet, channel)
return
iterate_all(irc, _handle_kick_loop, extra_args=(source, command, args))
if origuser and not irc.users[target].channels:
del relayusers[origuser][irc.name]
irc.quit(target, 'Left all shared channels.')
utils.add_hook(handle_kick, 'KICK')
def handle_chgclient(irc, source, command, args):
target = args['target']
if args.get('newhost'):
field = 'HOST'
text = args['newhost']
elif args.get('newident'):
field = 'IDENT'
text = args['newident']
elif args.get('newgecos'):
field = 'GECOS'
text = args['newgecos']
if field:
def _handle_chgclient_loop(irc, remoteirc, user):
try:
if field == 'HOST':
newtext = normalize_host(remoteirc, text)
else: # Don't overwrite the original text variable on every iteration.
newtext = text
remoteirc.update_client(user, field, newtext)
except NotImplementedError: # IRCd doesn't support changing the field we want
log.debug('(%s) relay.handle_chgclient: Ignoring changing field %r of %s on %s (for %s/%s);'
' remote IRCd doesn\'t support it', irc.name, field,
user, remoteirc.name, target, irc.name)
return
iterate_all_present(irc, target, _handle_chgclient_loop)
for c in ('CHGHOST', 'CHGNAME', 'CHGIDENT'):
utils.add_hook(handle_chgclient, c)
def _is_uline(irc, client):
return irc.get_friendly_name(irc.get_server(client)) in irc.serverdata.get('ulines', [])
def handle_mode(irc, numeric, command, args):
target = args['target']
modes = args['modes']
def _handle_mode_loop(irc, remoteirc, numeric, command, target, modes):
if irc.is_channel(target):
remotechan = get_remote_channel(irc, remoteirc, target)
if not remotechan:
return
supported_modes = get_supported_cmodes(irc, remoteirc, target, modes)
# Check if the sender is a user with a relay client; otherwise relay the mode
# from the corresponding server.
remotesender = get_remote_user(irc, remoteirc, numeric, spawn_if_missing=False) or \
get_relay_server_sid(remoteirc, irc) or remoteirc.sid
if not remoteirc.has_cap('can-spawn-clients'):
friendly_modes = []
for modepair in modes:
modechar = modepair[0][-1]
if modechar in irc.prefixmodes:
orig_user = get_orig_user(irc, modepair[1])
if orig_user and orig_user[0] == remoteirc.name:
# Don't display prefix mode changes for someone on the target clientbot
# link; this will either be relayed via modesync or ignored.
continue
# Convert UIDs to nicks when relaying this to clientbot.
modepair = (modepair[0], irc.get_friendly_name(modepair[1]))
elif modechar in irc.cmodes['*A'] and irc.is_hostmask(modepair[1]) and \
conf.conf.get('relay', {}).get('clientbot_modesync', 'none').lower() != 'none':
# Don't show bans if the ban is a simple n!u@h and modesync is enabled
continue
friendly_modes.append(modepair)
if friendly_modes:
# Call hooks, this is used for clientbot relay.
remoteirc.call_hooks([remotesender, 'RELAY_RAW_MODE', {'channel': remotechan, 'modes': friendly_modes}])
if supported_modes:
remoteirc.mode(remotesender, remotechan, supported_modes)
else:
# Set hideoper on remote opers, to prevent inflating
# /lusers and various /stats
hideoper_mode = remoteirc.umodes.get('hideoper')
modes = get_supported_umodes(irc, remoteirc, modes)
if hideoper_mode:
if ('+o', None) in modes:
modes.append(('+%s' % hideoper_mode, None))
elif ('-o', None) in modes:
modes.append(('-%s' % hideoper_mode, None))
remoteuser = get_remote_user(irc, remoteirc, target, spawn_if_missing=False)
if remoteuser and modes:
remoteirc.mode(remoteuser, remoteuser, modes)
reversed_modes = []
if irc.is_channel(target):
# Use the old state of the channel to check for CLAIM access.
oldchan = args.get('channeldata')
# Block modedelta modes from being unset by leaf networks
relay_entry = get_relay(irc, target)
if not relay_entry:
modedelta_modes = []
else:
modedelta_modes = db[relay_entry].get('modedelta', [])
modedelta_modes = list(filter(None, [irc.cmodes.get(named_modepair[0])
for named_modepair in modedelta_modes]))
if not check_claim(irc, target, numeric, chanobj=oldchan):
# Mode change blocked by CLAIM.
reversed_modes = irc.reverse_modes(target, modes, oldobj=oldchan)
if _is_uline(irc, numeric):
# Special hack for "U-lined" servers - ignore changes to SIMPLE modes and
# attempts to op u-lined clients (trying to change status for others
# SHOULD be reverted).
# This is for compatibility with Anope's DEFCON for the most part, as well as
# silly people who try to register a channel multiple times via relay.
reversed_modes = [modepair for modepair in reversed_modes if
# Mode is a prefix mode but target isn't ulined, revert
((modepair[0][-1] in irc.prefixmodes and not
_is_uline(irc, modepair[1]))
# Tried to set a list mode, revert
or modepair[0][-1] in irc.cmodes['*A'])
]
modes.clear() # Clear the mode list so nothing is relayed below
for modepair in modes.copy():
log.debug('(%s) relay.handle_mode: checking if modepair %s is in %s',
irc.name, str(modepair), str(modedelta_modes))
modechar = modepair[0][-1]
if modechar in modedelta_modes:
if modechar in irc.cmodes['*A'] or modechar in irc.prefixmodes:
# Don't enforce invalid modes.
log.debug('(%s) relay.handle_mode: Not enforcing invalid modedelta mode %s on %s (list or prefix mode)',
irc.name, str(modepair), target)
continue
elif not irc.has_cap('can-spawn-clients'):
log.debug('(%s) relay.handle_mode: Not enforcing modedelta modes on bot-only network',
irc.name)
continue
modes.remove(modepair)
if relay_entry[0] != irc.name:
# On leaf nets, enforce the modedelta.
reversed_modes += irc.reverse_modes(target, [modepair], oldobj=oldchan)
log.debug('(%s) relay.handle_mode: Reverting change of modedelta mode %s on %s',
irc.name, str(modepair), target)
else:
# On the home net, just don't propagate the mode change.
log.debug('(%s) relay.handle_mode: Not propagating change of modedelta mode %s on %s',
irc.name, str(modepair), target)
if reversed_modes:
log.debug('(%s) relay.handle_mode: Reversing mode changes of %r with %r.',
irc.name, args['modes'], reversed_modes)
irc.mode(irc.sid, target, reversed_modes)
if modes:
iterate_all(irc, _handle_mode_loop, extra_args=(numeric, command, target, modes))
utils.add_hook(handle_mode, 'MODE')
def handle_topic(irc, numeric, command, args):
channel = args['channel']
oldtopic = args.get('oldtopic')
topic = args['text']
if check_claim(irc, channel, numeric):
def _handle_topic_loop(irc, remoteirc, numeric, command, args):
channel = args['channel']
oldtopic = args.get('oldtopic')
topic = args['text']
remotechan = get_remote_channel(irc, remoteirc, channel)
# Don't send if the remote topic is the same as ours.
if remotechan is None or remotechan not in remoteirc.channels or \
topic == remoteirc.channels[remotechan].topic:
return
# This might originate from a server too.
remoteuser = get_remote_user(irc, remoteirc, numeric, spawn_if_missing=False)
if remoteuser:
remoteirc.topic(remoteuser, remotechan, topic)
else:
rsid = get_relay_server_sid(remoteirc, irc)
remoteirc.topic_burst(rsid, remotechan, topic)
iterate_all(irc, _handle_topic_loop, extra_args=(numeric, command, args))
elif oldtopic: # Topic change blocked by claim.
irc.topic_burst(irc.sid, channel, oldtopic)
utils.add_hook(handle_topic, 'TOPIC')
def handle_kill(irc, numeric, command, args):
target = args['target']
userdata = args['userdata']
# Try to find the original client of the target being killed
if userdata and hasattr(userdata, 'remote'):
realuser = userdata.remote
else:
realuser = get_orig_user(irc, target)
log.debug('(%s) relay.handle_kill: realuser is %r', irc.name, realuser)
# Target user was remote:
if realuser and realuser[0] != irc.name:
# We don't allow killing over the relay, so we must respawn the affected
# client and rejoin it to its channels.
del relayusers[realuser][irc.name]
remoteirc = world.networkobjects[realuser[0]]
for remotechan in remoteirc.users[realuser[1]].channels:
localchan = get_remote_channel(remoteirc, irc, remotechan)
if localchan:
modes = get_prefix_modes(remoteirc, irc, remotechan, realuser[1])
log.debug('(%s) relay.handle_kill: userpair: %s, %s', irc.name, modes, realuser)
client = get_remote_user(remoteirc, irc, realuser[1], times_tagged=1)
irc.sjoin(get_relay_server_sid(irc, remoteirc), localchan, [(modes, client)])
if userdata and numeric in irc.users:
log.info('(%s) relay.handle_kill: Blocked KILL (reason %r) from %s to relay client %s/%s.',
irc.name, args['text'], irc.users[numeric].nick,
remoteirc.users[realuser[1]].nick, realuser[0])
irc.msg(numeric, "Your kill to %s has been blocked "
"because PyLink does not allow killing"
" users over the relay at this time." % \
userdata.nick, notice=True)
else:
log.info('(%s) relay.handle_kill: Blocked KILL (reason %r) from server %s to relay client %s/%s.',
irc.name, args['text'], irc.servers[numeric].name,
remoteirc.users[realuser[1]].nick, realuser[0])
# Target user was local.
else:
# IMPORTANT: some IRCds (charybdis) don't send explicit QUIT messages
# for locally killed clients, while others (inspircd) do!
# If we receive a user object in 'userdata' instead of None, it means
# that the KILL hasn't been handled by a preceding QUIT message.
if userdata:
handle_quit(irc, target, 'KILL', {'text': args['text']})
utils.add_hook(handle_kill, 'KILL')
def handle_away(irc, numeric, command, args):
iterate_all_present(irc, numeric,
lambda irc, remoteirc, user:
remoteirc.away(user, args['text']))
utils.add_hook(handle_away, 'AWAY')
def handle_invite(irc, source, command, args):
target = args['target']
channel = args['channel']
if is_relay_client(irc, target):
remotenet, remoteuser = get_orig_user(irc, target)
remoteirc = world.networkobjects[remotenet]
remotechan = get_remote_channel(irc, remoteirc, channel)
remotesource = get_remote_user(irc, remoteirc, source, spawn_if_missing=False)
if remotesource is None:
irc.msg(source, 'You must be in a common channel '
'with %s to invite them to channels.' % \
irc.users[target].nick,
notice=True)
elif remotechan is None:
irc.msg(source, 'You cannot invite someone to a '
'channel not on their network!',
notice=True)
else:
remoteirc.invite(remotesource, remoteuser,
remotechan)
utils.add_hook(handle_invite, 'INVITE')
def handle_endburst(irc, numeric, command, args):
if numeric == irc.uplink:
initialize_all(irc)
utils.add_hook(handle_endburst, "ENDBURST")
def handle_services_login(irc, numeric, command, args):
"""
Relays services account changes as a hook, for integration with plugins like Automode.
"""
iterate_all_present(irc, numeric,
lambda irc, remoteirc, user:
remoteirc.call_hooks([user, 'PYLINK_RELAY_SERVICES_LOGIN', args]))
utils.add_hook(handle_services_login, 'CLIENT_SERVICES_LOGIN')
def handle_disconnect(irc, numeric, command, args):
"""Handles IRC network disconnections (internal hook)."""
# Quit all of our users' representations on other nets, and remove
# them from our relay clients index.
log.debug('(%s) Grabbing spawnlocks[%s] from thread %r in function %r', irc.name, irc.name,
threading.current_thread().name, inspect.currentframe().f_code.co_name)
if spawnlocks[irc.name].acquire(timeout=TCONDITION_TIMEOUT):
for k, v in relayusers.copy().items():
if irc.name in v:
del relayusers[k][irc.name]
if k[0] == irc.name:
del relayusers[k]
spawnlocks[irc.name].release()
# SQUIT all relay pseudoservers spawned for us, and remove them
# from our relay subservers index.
log.debug('(%s) Grabbing spawnlocks_servers[%s] from thread %r in function %r', irc.name, irc.name,
threading.current_thread().name, inspect.currentframe().f_code.co_name)
if spawnlocks_servers[irc.name].acquire(timeout=TCONDITION_TIMEOUT):
def _handle_disconnect_loop(irc, remoteirc):
name = remoteirc.name
if name != irc.name:
try:
rsid = relayservers[name][irc.name]
except KeyError:
return
else:
remoteirc.proto.squit(remoteirc.sid, rsid, text='Relay network lost connection.')
if irc.name in relayservers[name]:
del relayservers[name][irc.name]
iterate_all(irc, _handle_disconnect_loop)
try:
del relayservers[irc.name]
except KeyError: # Already removed; ignore.
pass
spawnlocks_servers[irc.name].release()
# Announce the disconnects to every leaf channel where the disconnected network is the owner
announcement = conf.conf.get('relay', {}).get('disconnect_announcement')
log.debug('(%s) relay: last connection successful: %s', irc.name, args.get('was_successful'))
if announcement and args.get('was_successful'):
for chanpair, entrydata in db.items():
log.debug('(%s) relay: Looking up %s', irc.name, chanpair)
if chanpair[0] == irc.name:
for leaf in entrydata['links']:
log.debug('(%s) relay: Announcing disconnect to %s%s', irc.name,
leaf[0], leaf[1])
remoteirc = world.networkobjects.get(leaf[0])
if remoteirc and remoteirc.connected.is_set():
text = string.Template(announcement).safe_substitute(
{'homenetwork': irc.name, 'homechannel': chanpair[1],
'network': remoteirc.name, 'channel': leaf[1]})
remoteirc.msg(leaf[1], text, loopback=False)
utils.add_hook(handle_disconnect, "PYLINK_DISCONNECT")
def nick_collide(irc, target):
"""
Handles nick collisions on relay clients and attempts to fix nicks.
"""
remotenet, remoteuser = get_orig_user(irc, target)
remoteirc = world.networkobjects[remotenet]
nick = remoteirc.users[remoteuser].nick
# Force a tagged nick by setting times_tagged to 1.
newnick = normalize_nick(irc, remotenet, nick, times_tagged=1)
log.debug('(%s) relay.nick_collide: Fixing nick of relay client %r (%s) to %s',
irc.name, target, nick, newnick)
irc.nick(target, newnick)
def handle_save(irc, numeric, command, args):
target = args['target']
if is_relay_client(irc, target):
# Nick collision!
# It's one of our relay clients; try to fix our nick to the next
# available normalized nick.
nick_collide(irc, target)
else:
# Somebody else on the network (not a PyLink client) had a nick collision;
# relay this as a nick change appropriately.
handle_nick(irc, target, 'SAVE', {'oldnick': None, 'newnick': target})
utils.add_hook(handle_save, "SAVE")
def handle_svsnick(irc, numeric, command, args):
"""
Handles forced nick change attempts to relay clients, tagging their nick.
"""
target = args['target']
if is_relay_client(irc, target):
nick_collide(irc, target)
utils.add_hook(handle_svsnick, "SVSNICK")
def handle_knock(irc, source, command, args):
def _handle_knock_loop(irc, remoteirc, source, command, args):
channel = args['channel']
remotechan = get_remote_channel(irc, remoteirc, channel)
# TS6 does not use reasons with knock, so this is not always available.
text = args['text'] or 'No reason available'
if remotechan is None or remotechan not in remoteirc.channels:
return
remoteuser = get_remote_user(irc, remoteirc, source, spawn_if_missing=False)
use_fallback = False
if remoteuser:
try:
remoteirc.knock(remoteuser, remotechan, text)
except NotImplementedError:
use_fallback = True
else:
use_fallback = True
# Fallback to a simple notice directed to ops
if use_fallback:
nick = irc.get_friendly_name(source)
log.debug('(%s) relay: using fallback KNOCK routine for %s on %s/%s',
irc.name, nick, remoteirc.name, remotechan)
prefix = '%' if 'h' in remoteirc.prefixmodes else '@'
remoteirc.notice(remoteirc.pseudoclient.uid, prefix + remotechan,
"Knock from %s@%s (*not* invitable from this network): %s" %
(nick, irc.name, text))
iterate_all(irc, _handle_knock_loop, extra_args=(source, command, args))
utils.add_hook(handle_knock, 'KNOCK')
### PUBLIC COMMANDS
def create(irc, source, args):
"""<channel>
Opens up the given channel over PyLink Relay."""
try:
channel = irc.to_lower(args[0])
except IndexError:
irc.error("Not enough arguments. Needs 1: channel.")
return
if not irc.is_channel(channel):
irc.error('Invalid channel %r.' % channel)
return
if not irc.has_cap('can-host-relay'):
irc.error('Clientbot networks cannot be used to host a relay.')
return
if channel not in irc.channels or source not in irc.channels[channel].users:
irc.error('You must be in %r to complete this operation.' % channel)
return
permissions.check_permissions(irc, source, ['relay.create'])
# Check to see whether the channel requested is already part of a different
# relay.
localentry = get_relay(irc, channel)
if localentry:
irc.error('Channel %r is already part of a relay.' % channel)
return
creator = irc.get_hostmask(source)
# Create the relay database entry with the (network name, channel name)
# pair - this is just a dict with various keys.
db[(irc.name, channel)] = {'claim': [irc.name], 'links': set(),
'blocked_nets': set(), 'creator': creator,
'ts': time.time()}
log.info('(%s) relay: Channel %s created by %s.', irc.name, channel, creator)
initialize_channel(irc, channel)
irc.reply('Done.')
create = utils.add_cmd(create, featured=True)
def stop_relay(entry):
"""Internal function to deinitialize a relay link and its leaves."""
network, channel = entry
# Iterate over all the channel links and deinitialize them.
for link in db[entry]['links']:
remove_channel(world.networkobjects.get(link[0]), link[1])
remove_channel(world.networkobjects.get(network), channel)
def destroy(irc, source, args):
"""[<home network>] <channel>
Removes the given channel from the PyLink Relay, delinking all networks linked to it. If the home network is given and you are logged in as admin, this can also remove relay channels from other networks."""
try: # Two args were given: first one is network name, second is channel.
channel = irc.to_lower(args[1])
network = args[0]
except IndexError:
try: # One argument was given; assume it's just the channel.
channel = irc.to_lower(args[0])
network = irc.name
except IndexError:
irc.error("Not enough arguments. Needs 1-2: channel, network (optional).")
return
if not irc.is_channel(channel):
irc.error('Invalid channel %r.' % channel)
return
# Check for different permissions based on whether we're destroying a local channel or
# a remote one.
if network == irc.name:
permissions.check_permissions(irc, source, ['relay.destroy'])
else:
permissions.check_permissions(irc, source, ['relay.destroy.remote'])
entry = (network, channel)
if entry in db:
stop_relay(entry)
del db[entry]
log.info('(%s) relay: Channel %s destroyed by %s.', irc.name,
channel, irc.get_hostmask(source))
irc.reply('Done.')
else:
irc.error("No such channel %r exists. If you're trying to delink a channel from "
"another network, use the DESTROY command." % channel)
return
destroy = utils.add_cmd(destroy, featured=True)
@utils.add_cmd
def purge(irc, source, args):
"""<network>
Destroys all links relating to the target network."""
permissions.check_permissions(irc, source, ['relay.purge'])
try:
network = args[0]
except IndexError:
irc.error("Not enough arguments. Needs 1: network.")
return
count = 0
for entry in db.copy():
# Entry was owned by the target network; remove it
if entry[0] == network:
count += 1
stop_relay(entry)
del db[entry]
else:
# Drop leaf channels involving the target network
for link in db[entry]['links'].copy():
if link[0] == network:
count += 1
remove_channel(world.networkobjects.get(network), link[1])
db[entry]['links'].remove(link)
irc.reply("Done. Purged %s entries involving the network %s." % (count, network))
link_parser = utils.IRCParser()
link_parser.add_argument('remotenet')
link_parser.add_argument('channel')
link_parser.add_argument('localchannel', nargs='?')
link_parser.add_argument("-f", "--force", action='store_true')
def link(irc, source, args):
"""<remotenet> <channel> [<local channel>] [-f/--force]
Links the specified channel on \x02remotenet\x02 over PyLink Relay as \x02local channel\x02.
If \x02local channel\x02 is not specified, it defaults to the same name as \x02channel\x02.
If the --force option is given, this command will bypass checks for TS and whether the target
network is alive, and link the channel anyways."""
args = link_parser.parse_args(args)
# Normalize channel case
channel = irc.to_lower(args.channel)
localchan = irc.to_lower(args.localchannel or args.channel)
remotenet = args.remotenet
for c in (channel, localchan):
if not irc.is_channel(c):
irc.error('Invalid channel %r.' % c)
return
if remotenet == irc.name:
irc.error('Cannot link two channels on the same network.')
return
if localchan not in irc.channels or source not in irc.channels[localchan].users:
# Caller is not in the requested channel.
log.debug('(%s) Source not in channel %s; protoname=%s', irc.name, localchan, irc.protoname)
if irc.protoname == 'clientbot':
# Special case for Clientbot: join the requested channel first, then
# require that the caller be opped.
if localchan not in irc.pseudoclient.channels:
irc.join(irc.pseudoclient.uid, localchan)
irc.reply('Joining %r now to check for op status; please run this command again after I join.' % localchan)
return
elif not irc.channels[localchan].is_op_plus(source):
irc.error('You must be opped in %r to complete this operation.' % localchan)
return
else:
irc.error('You must be in %r to complete this operation.' % localchan)
return
permissions.check_permissions(irc, source, ['relay.link'])
if remotenet not in world.networkobjects:
irc.error('No network named %r exists.' % remotenet)
return
localentry = get_relay(irc, localchan)
if localentry:
irc.error('Channel %r is already part of a relay.' % localchan)
return
try:
entry = db[(remotenet, channel)]
except KeyError:
irc.error('No such relay %r exists.' % args.channel)
return
else:
if irc.name in entry['blocked_nets']:
irc.error('Access denied (target channel is not open to links).')
return
for link in entry['links']:
if link[0] == irc.name:
irc.error("Remote channel '%s%s' is already linked here "
"as %r." % (remotenet, args.channel, link[1]))
return
if args.force:
permissions.check_permissions(irc, source, ['relay.link.force'])
log.info("(%s) relay: Forcing link %s%s -> %s%s", irc.name, irc.name, localchan, remotenet,
args.channel)
else:
if not world.networkobjects[remotenet].connected.is_set():
log.debug('(%s) relay: Blocking link request %s%s -> %s%s because the target '
'network is down', irc.name, irc.name, localchan, remotenet, args.channel)
irc.error("The target network %s is not connected; refusing to link (you may be "
"able to override this with the --force option)." % remotenet)
return
our_ts = irc.channels[localchan].ts
if channel not in world.networkobjects[remotenet].channels:
irc.error("Unknown target channel %r." % channel)
return
their_ts = world.networkobjects[remotenet].channels[channel].ts
if (our_ts < their_ts) and irc.has_cap('has-ts'):
log.debug('(%s) relay: Blocking link request %s%s -> %s%s due to bad TS (%s < %s)', irc.name,
irc.name, localchan, remotenet, args.channel, our_ts, their_ts)
irc.error("The channel creation date (TS) on %s (%s) is lower than the target "
"channel's (%s); refusing to link. You should clear the local channel %s first "
"before linking, or use a different local channel (you may be able to "
"override this with the --force option)." % (localchan, our_ts, their_ts, localchan))
return
entry['links'].add((irc.name, localchan))
log.info('(%s) relay: Channel %s linked to %s%s by %s.', irc.name,
localchan, remotenet, args.channel, irc.get_hostmask(source))
initialize_channel(irc, localchan)
irc.reply('Done.')
link = utils.add_cmd(link, featured=True)
def delink(irc, source, args):
"""<local channel> [<network>]
Delinks the given channel from PyLink Relay. \x02network\x02 must and can only be specified if you are on the host network for the channel given, and allows you to pick which network to delink.
To remove a relay channel entirely, use the 'destroy' command instead."""
try:
channel = irc.to_lower(args[0])
except IndexError:
irc.error("Not enough arguments. Needs 1-2: channel, remote netname (optional).")
return
try:
remotenet = args[1]
except IndexError:
remotenet = None
permissions.check_permissions(irc, source, ['relay.delink'])
if not irc.is_channel(channel):
irc.error('Invalid channel %r.' % channel)
return
entry = get_relay(irc, channel)
if entry:
if entry[0] == irc.name: # We own this channel.
if not remotenet:
irc.error("You must select a network to "
"delink, or use the 'destroy' command to remove "
"this relay entirely (it was created on the current "
"network).")
return
else:
for link in db[entry]['links'].copy():
if link[0] == remotenet:
remove_channel(world.networkobjects.get(remotenet), link[1])
db[entry]['links'].remove(link)
else:
remove_channel(irc, channel)
db[entry]['links'].remove((irc.name, channel))
irc.reply('Done.')
log.info('(%s) relay: Channel %s delinked from %s%s by %s.', irc.name,
channel, entry[0], entry[1], irc.get_hostmask(source))
else:
irc.error('No such relay %r.' % channel)
delink = utils.add_cmd(delink, featured=True)
def linked(irc, source, args):
"""[<network>]
Returns a list of channels shared across PyLink Relay. If \x02network\x02 is given, filters output to channels linked to the given network."""
permissions.check_permissions(irc, source, ['relay.linked'])
# Only show remote networks that are marked as connected.
remote_networks = [netname for netname, ircobj in world.networkobjects.copy().items()
if ircobj.connected.is_set()]
# But remove the current network from the list, so that it isn't shown twice.
remote_networks.remove(irc.name)
remote_networks.sort()
s = 'Connected networks: \x02%s\x02 %s' % (irc.name, ' '.join(remote_networks))
# Always reply in private to prevent floods.
irc.reply(s, private=True)
net = ''
try:
net = args[0]
except:
pass
else:
irc.reply("Showing channels linked to %s:" % net, private=True)
# Sort the list of shared channels when displaying
for k, v in sorted(db.items()):
# Skip if we're filtering by network and the network given isn't relayed
# to the channel.
if net and not (net == k[0] or net in [link[0] for link in v['links']]):
continue
# Bold each network/channel name pair
s = '\x02%s%s\x02 ' % k
remoteirc = world.networkobjects.get(k[0])
channel = k[1] # Get the channel name from the network/channel pair
if remoteirc and channel in remoteirc.channels:
c = remoteirc.channels[channel]
if ('s', None) in c.modes or ('p', None) in c.modes:
# Only show secret channels to opers or those in the channel, and tag them as
# [secret].
localchan = get_remote_channel(remoteirc, irc, channel)
if irc.is_oper(source) or (localchan and source in irc.channels[localchan].users):
s += '\x02[secret]\x02 '
else:
continue
if v['links']:
# Sort, join up and output all the linked channel names. Silently drop
# entries for disconnected networks.
s += ' '.join([''.join(link) for link in sorted(v['links']) if link[0] in world.networkobjects
and world.networkobjects[link[0]].connected.is_set()])
else: # Unless it's empty; then, well... just say no relays yet.
s += '(no relays yet)'
irc.reply(s, private=True)
if irc.is_oper(source):
s = ''
# If the caller is an oper, we can show the hostmasks of people
# that created all the available channels (Janus does this too!!)
creator = v.get('creator')
if creator:
# But only if the value actually exists (old DBs will have it
# missing).
s += ' by \x02%s\x02' % creator
# Ditto for creation date
ts = v.get('ts')
if ts:
s += ' on %s' % time.ctime(ts)
if s: # Indent to make the list look nicer
irc.reply(' Channel created%s.' % s, private=True)
linked = utils.add_cmd(linked, featured=True)
@utils.add_cmd
def linkacl(irc, source, args):
"""ALLOW|DENY|LIST <channel> <remotenet>
Allows blocking / unblocking certain networks from linking to a relayed channel, based on a blacklist.
LINKACL LIST returns a list of blocked networks for a channel, while the ALLOW and DENY subcommands allow manipulating this blacklist."""
missingargs = "Not enough arguments. Needs 2-3: subcommand (ALLOW/DENY/LIST), channel, remote network (for ALLOW/DENY)."
try:
cmd = args[0].lower()
channel = irc.to_lower(args[1])
except IndexError:
irc.error(missingargs)
return
if not irc.is_channel(channel):
irc.error('Invalid channel %r.' % channel)
return
relay = get_relay(irc, channel)
if not relay:
irc.error('No such relay %r exists.' % channel)
return
if cmd == 'list':
permissions.check_permissions(irc, source, ['relay.linkacl.view'])
s = 'Blocked networks for \x02%s\x02: \x02%s\x02' % (channel, ', '.join(db[relay]['blocked_nets']) or '(empty)')
irc.reply(s)
return
permissions.check_permissions(irc, source, ['relay.linkacl'])
try:
remotenet = args[2]
except IndexError:
irc.error(missingargs)
return
if cmd == 'deny':
db[relay]['blocked_nets'].add(remotenet)
irc.reply('Done.')
elif cmd == 'allow':
try:
db[relay]['blocked_nets'].remove(remotenet)
except KeyError:
irc.error('Network %r is not on the blacklist for %r.' % (remotenet, channel))
else:
irc.reply('Done.')
else:
irc.error('Unknown subcommand %r: valid ones are ALLOW, DENY, and LIST.' % cmd)
@utils.add_cmd
def showuser(irc, source, args):
"""<user>
Shows relay data about the given user. This supplements the 'showuser' command in the 'commands' plugin, which provides more general information."""
try:
target = args[0]
except IndexError:
# No errors here; showuser from the commands plugin already does this
# for us.
return
u = irc.nick_to_uid(target)
if u:
irc.reply("Showing relay information on user \x02%s\x02:" % irc.users[u].nick, private=True)
try:
userpair = get_orig_user(irc, u) or (irc.name, u)
remoteusers = relayusers[userpair].items()
except KeyError:
pass
else:
nicks = []
if remoteusers:
nicks.append('%s:\x02%s\x02' % (userpair[0],
world.networkobjects[userpair[0]].users[userpair[1]].nick))
for r in remoteusers:
remotenet, remoteuser = r
remoteirc = world.networkobjects[remotenet]
nicks.append('%s:\x02%s\x02' % (remotenet, remoteirc.users[remoteuser].nick))
irc.reply("\x02Relay nicks\x02: %s" % ', '.join(nicks), private=True)
relaychannels = []
for ch in irc.users[u].channels:
relay = get_relay(irc, ch)
if relay:
relaychannels.append(''.join(relay))
if relaychannels and (irc.is_oper(source) or u == source):
irc.reply("\x02Relay channels\x02: %s" % ' '.join(relaychannels), private=True)
@utils.add_cmd
def showchan(irc, source, args):
"""<user>
Shows relay data about the given channel. This supplements the 'showchan' command in the 'commands' plugin, which provides more general information."""
try:
channel = irc.to_lower(args[0])
except IndexError:
return
if channel not in irc.channels:
return
f = lambda s: irc.reply(s, private=True)
c = irc.channels[channel]
# Only show verbose info if caller is oper or is in the target channel.
verbose = source in c.users or irc.is_oper(source)
secret = ('s', None) in c.modes
if secret and not verbose:
# Hide secret channels from normal users.
return
else:
relayentry = get_relay(irc, channel)
if relayentry:
relays = ['\x02%s\x02' % ''.join(relayentry)]
relays += [''.join(link) for link in db[relayentry]['links']]
f('\x02Relayed channels:\x02 %s' % (' '.join(relays)))
@utils.add_cmd
def save(irc, source, args):
"""takes no arguments.
Saves the relay database to disk."""
permissions.check_permissions(irc, source, ['relay.savedb'])
datastore.save()
irc.reply('Done.')
@utils.add_cmd
def claim(irc, source, args):
"""<channel> [<comma separated list of networks>]
Sets the CLAIM for a channel to a case-sensitive list of networks. If no list of networks is
given, this shows which networks have a claim over the channel. A single hyphen (-) can also be
given as a list of networks to disable CLAIM from the channel entirely.
CLAIM is a way of enforcing network ownership for channels, similar to Janus. Unless a
channel's CLAIM list is empty, only networks on its CLAIM list (plus the creating network) are
allowed to override kicks, mode changes, and topic changes - attempts from other networks are
either blocked or reverted. "override" in this case refers to any KICK, MODE, or TOPIC change
from a sender that is not halfop or above in the channel (this affects servers and services
as well).
"""
try:
channel = irc.to_lower(args[0])
except IndexError:
irc.error("Not enough arguments. Needs 1-2: channel, list of networks (optional).")
return
permissions.check_permissions(irc, source, ['relay.claim'])
# We override get_relay() here to limit the search to the current network.
relay = (irc.name, channel)
if relay not in db:
irc.error('No relay %r exists on this network (this command must be run on the '
'network this channel was created on).' % channel)
return
claimed = db[relay]["claim"]
try:
nets = args[1].strip()
except IndexError: # No networks given.
irc.reply('Channel \x02%s\x02 is claimed by: %s' %
(channel, ', '.join(claimed) or '\x1D(none)\x1D'))
else:
if nets == '-' or not nets:
claimed = set()
else:
claimed = set(nets.split(','))
db[relay]["claim"] = claimed
irc.reply('CLAIM for channel \x02%s\x02 set to: %s' %
(channel, ', '.join(claimed) or '\x1D(none)\x1D'))
@utils.add_cmd
def modedelta(irc, source, args):
"""<channel> [<named modes>]
Sets the relay mode delta for the given channel: a list of named mode pairs to apply on leaf
channels, but not the host network.
This may be helpful in fighting spam if leaf networks
don't police it as well as your own (e.g. you can set +R with this).
Mode names are defined using PyLink named modes, and not IRC mode characters: you can find a
list of channel named modes and the characters they map to on different IRCds at:
https://raw.githack.com/GLolol/PyLink/devel/docs/modelists/channel-modes.html
Examples of setting modes:
modedelta #channel regonly
modedelta #channel regonly inviteonly
modedelta #channel key,supersecret sslonly
modedelta #channel -
If no modes are given, this shows the mode delta for the channel.
A single hyphen (-) can also be given as a list of modes to disable the mode delta
and remove any mode deltas from relay leaves.
Note: only simple and single-arg modes (e.g. +f, +l) are supported; list modes and
prefix modes such as bans and op are NOT.
"""
try:
channel = irc.to_lower(args[0])
except IndexError:
irc.error("Not enough arguments. Needs 1-2: channel, list of modes (optional).")
return
permissions.check_permissions(irc, source, ['relay.modedelta'])
# We override get_relay() here to limit the search to the current network.
relay = (irc.name, channel)
if relay not in db:
irc.error('No relay %r exists on this network (this command must be run on the '
'network this channel was created on).' % channel)
return
target_modes = []
old_modes = []
if '-' in args[1:]: # - given to clear the list
try:
# Keep track of the old modedelta modes, and unset them when applying the new ones
old_modes = db[relay]['modedelta']
del db[relay]['modedelta']
except KeyError:
irc.error('No mode delta exists for %r.' % channel)
return
else:
irc.reply('Cleared the mode delta for %r.' % channel)
else:
modes = []
for modepair in args[1:]:
# Construct mode pairs given the initial query.
m = modepair.split(',', 1)
if len(m) == 1:
m.append(None)
# Sanity check: you shouldn't be allowed to lock things like op or redirects
# because one misconfiguration can cause serious desyncs.
if m[0] not in WHITELISTED_CMODES:
irc.error('Setting mode %r is not supported for modedelta (case sensitive).' % m[0])
return
modes.append(m)
if modes:
old_modes = db[relay].get('modedelta', [])
db[relay]['modedelta'] = target_modes = modes
log.debug('channel: %s', str(channel))
irc.reply('Set the mode delta for \x02%s\x02 to: %s' % (channel, modes))
else: # No modes given, so show the list.
irc.reply('Mode delta for channel \x02%s\x02 is set to: %s' %
(channel, db[relay].get('modedelta') or '\x1D(none)\x1D'))
# Add to target_modes all former modedelta modes that don't have a positive equivalent
# Note: We only check for (modechar, modedata) and not for (+modechar, modedata) here
# internally, but the actual filtering below checks for both?
modedelta_diff = [('-%s' % modepair[0], modepair[1]) for modepair in old_modes if
modepair not in target_modes]
target_modes += modedelta_diff
for chanpair in db[relay]['links']:
remotenet, remotechan = chanpair
remoteirc = world.networkobjects.get(remotenet)
if not remoteirc:
continue
remote_modes = []
# For each leaf channel, unset the old mode delta and set the new one
# if applicable.
log.debug('(%s) modedelta target modes for %s/%s: %s', irc.name, remotenet, remotechan, target_modes)
for modepair in target_modes:
modeprefix = modepair[0][0]
if modeprefix not in '+-': # Assume + if no prefix was given.
modeprefix = '+'
modename = modepair[0].lstrip('+-')
mchar = remoteirc.cmodes.get(modename)
if mchar:
if mchar in remoteirc.cmodes['*A'] or mchar in remoteirc.prefixmodes:
log.warning('(%s) Refusing to set modedelta mode %r on %s because it is a list or prefix mode',
irc.name, mchar, remotechan)
continue
elif not remoteirc.has_cap('can-spawn-clients'):
log.debug('(%s) relay.handle_mode: Not enforcing modedelta modes on bot-only network %s',
irc.name, remoteirc.name)
continue
remote_modes.append(('%s%s' % (modeprefix, mchar), modepair[1]))
if remote_modes:
log.debug('(%s) Sending modedelta modes %s to %s/%s', irc.name, remote_modes, remotenet, remotechan)
remoteirc.mode(remoteirc.pseudoclient.uid, remotechan, remote_modes)
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