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fix #581

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This commit is contained in:
Shivaram Lingamneni 2019-12-17 13:21:26 -05:00
parent 07865b8f63
commit c5a81d59ff
6 changed files with 126 additions and 52 deletions
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8
irc/channel.go
View File

@ -53,13 +53,7 @@ type Channel struct {
// NewChannel creates a new channel from a `Server` and a `name`
// string, which must be unique on the server.
func NewChannel(s *Server, name string, registered bool) *Channel {
casefoldedName, err := CasefoldChannel(name)
if err != nil {
s.logger.Error("internal", "Bad channel name", name, err.Error())
return nil
}
func NewChannel(s *Server, name, casefoldedName string, registered bool) *Channel {
config := s.Config()
channel := &Channel{

119
irc/channelmanager.go
View File

@ -13,36 +13,54 @@ type channelManagerEntry struct {
// think the channel is empty (without holding a lock across the entire Channel.Join()
// call)
pendingJoins int
skeleton string
}
// ChannelManager keeps track of all the channels on the server,
// providing synchronization for creation of new channels on first join,
// cleanup of empty channels on last part, and renames.
type ChannelManager struct {
sync.RWMutex // tier 2
chans map[string]*channelManagerEntry
registeredChannels map[string]bool
purgedChannels map[string]empty
server *Server
sync.RWMutex // tier 2
// chans is the main data structure, mapping casefolded name -> *Channel
chans map[string]*channelManagerEntry
chansSkeletons StringSet // skeletons of *unregistered* chans
registeredChannels StringSet // casefolds of registered chans
registeredSkeletons StringSet // skeletons of registered chans
purgedChannels StringSet // casefolds of purged chans
server *Server
}
// NewChannelManager returns a new ChannelManager.
func (cm *ChannelManager) Initialize(server *Server) {
cm.chans = make(map[string]*channelManagerEntry)
cm.chansSkeletons = make(StringSet)
cm.server = server
if server.Config().Channels.Registration.Enabled {
cm.loadRegisteredChannels()
}
// purging should work even if registration is disabled
cm.purgedChannels = cm.server.channelRegistry.PurgedChannels()
}
func (cm *ChannelManager) loadRegisteredChannels() {
registeredChannels := cm.server.channelRegistry.AllChannels()
purgedChannels := cm.server.channelRegistry.PurgedChannels()
rawNames := cm.server.channelRegistry.AllChannels()
registeredChannels := make(StringSet, len(rawNames))
registeredSkeletons := make(StringSet, len(rawNames))
for _, name := range rawNames {
cfname, err := CasefoldChannel(name)
if err == nil {
registeredChannels.Add(cfname)
}
skeleton, err := Skeleton(name)
if err == nil {
registeredSkeletons.Add(skeleton)
}
}
cm.Lock()
defer cm.Unlock()
cm.registeredChannels = registeredChannels
cm.purgedChannels = purgedChannels
cm.registeredSkeletons = registeredSkeletons
}
// Get returns an existing channel with name equivalent to `name`, or nil
@ -64,37 +82,49 @@ func (cm *ChannelManager) Get(name string) (channel *Channel) {
func (cm *ChannelManager) Join(client *Client, name string, key string, isSajoin bool, rb *ResponseBuffer) error {
server := client.server
casefoldedName, err := CasefoldChannel(name)
if err != nil || len(casefoldedName) > server.Config().Limits.ChannelLen {
skeleton, skerr := Skeleton(name)
if err != nil || skerr != nil || len(casefoldedName) > server.Config().Limits.ChannelLen {
return errNoSuchChannel
}
channel := func() *Channel {
channel, err := func() (*Channel, error) {
cm.Lock()
defer cm.Unlock()
_, purged := cm.purgedChannels[casefoldedName]
if purged {
return nil
if cm.purgedChannels.Has(casefoldedName) {
return nil, errChannelPurged
}
entry := cm.chans[casefoldedName]
if entry == nil {
registered := cm.registeredChannels[casefoldedName]
registered := cm.registeredChannels.Has(casefoldedName)
// enforce OpOnlyCreation
if !registered && server.Config().Channels.OpOnlyCreation && !client.HasRoleCapabs("chanreg") {
return nil
return nil, errInsufficientPrivs
}
// enforce confusables
if cm.chansSkeletons.Has(skeleton) || (!registered && cm.registeredSkeletons.Has(skeleton)) {
return nil, errConfusableIdentifier
}
entry = &channelManagerEntry{
channel: NewChannel(server, name, registered),
channel: NewChannel(server, name, casefoldedName, registered),
pendingJoins: 0,
}
if !registered {
// for an unregistered channel, we already have the correct unfolded name
// and therefore the final skeleton. for a registered channel, we don't have
// the unfolded name yet (it needs to be loaded from the db), but we already
// have the final skeleton in `registeredSkeletons` so we don't need to track it
cm.chansSkeletons.Add(skeleton)
entry.skeleton = skeleton
}
cm.chans[casefoldedName] = entry
}
entry.pendingJoins += 1
return entry.channel
return entry.channel, nil
}()
if channel == nil {
return errNoSuchChannel
if err != nil {
return err
}
channel.EnsureLoaded()
@ -109,8 +139,9 @@ func (cm *ChannelManager) maybeCleanup(channel *Channel, afterJoin bool) {
cm.Lock()
defer cm.Unlock()
nameCasefolded := channel.NameCasefolded()
entry := cm.chans[nameCasefolded]
cfname := channel.NameCasefolded()
entry := cm.chans[cfname]
if entry == nil || entry.channel != channel {
return
}
@ -119,7 +150,10 @@ func (cm *ChannelManager) maybeCleanup(channel *Channel, afterJoin bool) {
entry.pendingJoins -= 1
}
if entry.pendingJoins == 0 && entry.channel.IsClean() {
delete(cm.chans, nameCasefolded)
delete(cm.chans, cfname)
if entry.skeleton != "" {
delete(cm.chansSkeletons, entry.skeleton)
}
}
}
@ -177,7 +211,7 @@ func (cm *ChannelManager) SetRegistered(channelName string, account string) (err
if err != nil {
return err
}
cm.registeredChannels[cfname] = true
cm.registeredChannels.Add(cfname)
return nil
}
@ -211,13 +245,17 @@ func (cm *ChannelManager) SetUnregistered(channelName string, account string) (e
}
// Rename renames a channel (but does not notify the members)
func (cm *ChannelManager) Rename(name string, newname string) (err error) {
func (cm *ChannelManager) Rename(name string, newName string) (err error) {
cfname, err := CasefoldChannel(name)
if err != nil {
return errNoSuchChannel
}
cfnewname, err := CasefoldChannel(newname)
newCfname, err := CasefoldChannel(newName)
if err != nil {
return errInvalidChannelName
}
newSkeleton, err := Skeleton(newName)
if err != nil {
return errInvalidChannelName
}
@ -236,22 +274,35 @@ func (cm *ChannelManager) Rename(name string, newname string) (err error) {
cm.Lock()
defer cm.Unlock()
if cm.chans[cfnewname] != nil || cm.registeredChannels[cfnewname] {
if cm.chans[newCfname] != nil || cm.registeredChannels.Has(newCfname) {
return errChannelNameInUse
}
if cm.chansSkeletons.Has(newSkeleton) || cm.registeredSkeletons.Has(newSkeleton) {
return errChannelNameInUse
}
entry := cm.chans[cfname]
if entry == nil {
if entry == nil || !entry.channel.IsLoaded() {
return errNoSuchChannel
}
channel = entry.channel
info = channel.ExportRegistration(IncludeInitial)
registered := info.Founder != ""
delete(cm.chans, cfname)
cm.chans[cfnewname] = entry
if cm.registeredChannels[cfname] {
cm.chans[newCfname] = entry
if registered {
delete(cm.registeredChannels, cfname)
cm.registeredChannels[cfnewname] = true
if oldSkeleton, err := Skeleton(info.Name); err == nil {
delete(cm.registeredSkeletons, oldSkeleton)
}
cm.registeredChannels.Add(newCfname)
cm.registeredSkeletons.Add(newSkeleton)
} else {
delete(cm.chansSkeletons, entry.skeleton)
cm.chansSkeletons.Add(newSkeleton)
entry.skeleton = newSkeleton
cm.chans[cfname] = entry
}
entry.channel.Rename(newname, cfnewname)
entry.channel.Rename(newName, newCfname)
return nil
}
@ -283,7 +334,7 @@ func (cm *ChannelManager) Purge(chname string, record ChannelPurgeRecord) (err e
}
cm.Lock()
cm.purgedChannels[chname] = empty{}
cm.purgedChannels.Add(chname)
cm.Unlock()
cm.server.channelRegistry.PurgeChannel(chname, record)
@ -298,7 +349,7 @@ func (cm *ChannelManager) IsPurged(chname string) (result bool) {
}
cm.Lock()
_, result = cm.purgedChannels[chname]
result = cm.purgedChannels.Has(chname)
cm.Unlock()
return
}
@ -311,7 +362,7 @@ func (cm *ChannelManager) Unpurge(chname string) (err error) {
}
cm.Lock()
_, found := cm.purgedChannels[chname]
found := cm.purgedChannels.Has(chname)
delete(cm.purgedChannels, chname)
cm.Unlock()

12
irc/channelreg.go
View File

@ -114,17 +114,15 @@ func (reg *ChannelRegistry) Initialize(server *Server) {
reg.server = server
}
func (reg *ChannelRegistry) AllChannels() (result map[string]bool) {
result = make(map[string]bool)
prefix := fmt.Sprintf(keyChannelExists, "")
// AllChannels returns the uncasefolded names of all registered channels.
func (reg *ChannelRegistry) AllChannels() (result []string) {
prefix := fmt.Sprintf(keyChannelName, "")
reg.server.store.View(func(tx *buntdb.Tx) error {
return tx.AscendGreaterOrEqual("", prefix, func(key, value string) bool {
if !strings.HasPrefix(key, prefix) {
return false
}
channel := strings.TrimPrefix(key, prefix)
result[channel] = true
result = append(result, value)
return true
})
})
@ -132,7 +130,7 @@ func (reg *ChannelRegistry) AllChannels() (result map[string]bool) {
return
}
// PurgedChannels returns the set of all channel names that have been purged
// PurgedChannels returns the set of all casefolded channel names that have been purged
func (reg *ChannelRegistry) PurgedChannels() (result map[string]empty) {
result = make(map[string]empty)

2
irc/errors.go
View File

@ -41,6 +41,8 @@ var (
errNicknameReserved = errors.New("nickname is reserved")
errNoExistingBan = errors.New("Ban does not exist")
errNoSuchChannel = errors.New(`No such channel`)
errChannelPurged = errors.New(`This channel was purged by the server operators and cannot be used`)
errConfusableIdentifier = errors.New("This identifier is confusable with one already in use")
errInsufficientPrivs = errors.New("Insufficient privileges")
errInvalidUsername = errors.New("Invalid username")
errFeatureDisabled = errors.New(`That feature is disabled`)

26
irc/handlers.go
View File

@ -1290,13 +1290,28 @@ func joinHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *Resp
key = keys[i]
}
err := server.channels.Join(client, name, key, false, rb)
if err == errNoSuchChannel {
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.Nick(), utils.SafeErrorParam(name), client.t("No such channel"))
if err != nil {
sendJoinError(client, name, rb, err)
}
}
return false
}
func sendJoinError(client *Client, name string, rb *ResponseBuffer, err error) {
var errMsg string
switch err {
case errInsufficientPrivs:
errMsg = `Only server operators can create new channels`
case errConfusableIdentifier:
errMsg = `That channel name is too close to the name of another channel`
case errChannelPurged:
errMsg = err.Error()
default:
errMsg = `No such channel`
}
rb.Add(nil, client.server.name, ERR_NOSUCHCHANNEL, client.Nick(), utils.SafeErrorParam(name), client.t(errMsg))
}
// SAJOIN [nick] #channel{,#channel}
func sajoinHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
var target *Client
@ -1306,7 +1321,7 @@ func sajoinHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *Re
channelString = msg.Params[0]
} else {
if len(msg.Params) == 1 {
rb.Add(nil, server.name, ERR_NEEDMOREPARAMS, client.Nick(), "KICK", client.t("Not enough parameters"))
rb.Add(nil, server.name, ERR_NEEDMOREPARAMS, client.Nick(), "SAJOIN", client.t("Not enough parameters"))
return false
} else {
target = server.clients.Get(msg.Params[0])
@ -1320,7 +1335,10 @@ func sajoinHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *Re
channels := strings.Split(channelString, ",")
for _, chname := range channels {
server.channels.Join(target, chname, "", true, rb)
err := server.channels.Join(target, chname, "", true, rb)
if err != nil {
sendJoinError(client, chname, rb, err)
}
}
return false
}

11
irc/types.go
View File

@ -28,6 +28,17 @@ func (clients ClientSet) Has(client *Client) bool {
return ok
}
type StringSet map[string]empty
func (s StringSet) Has(str string) bool {
_, ok := s[str]
return ok
}
func (s StringSet) Add(str string) {
s[str] = empty{}
}
// MemberSet is a set of members with modes.
type MemberSet map[*Client]*modes.ModeSet