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server.go
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server.go
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// Copyright (c) 2012-2014 Jeremy Latt
// Copyright (c) 2014-2015 Edmund Huber
// Copyright (c) 2016-2017 Daniel Oaks <daniel@danieloaks.net>
// released under the MIT license
package irc
import (
"bufio"
"crypto/tls"
"encoding/base64"
"fmt"
"log"
"math/rand"
"net"
"os"
"os/signal"
"strconv"
"strings"
"sync"
"syscall"
"time"
"github.com/goshuirc/irc-go/ircfmt"
"github.com/goshuirc/irc-go/ircmsg"
"github.com/oragono/oragono/irc/caps"
"github.com/oragono/oragono/irc/isupport"
"github.com/oragono/oragono/irc/logger"
"github.com/oragono/oragono/irc/passwd"
"github.com/oragono/oragono/irc/sno"
"github.com/oragono/oragono/irc/utils"
"github.com/tidwall/buntdb"
)
var (
// common error line to sub values into
errorMsg, _ = (&[]ircmsg.IrcMessage{ircmsg.MakeMessage(nil, "", "ERROR", "%s ")}[0]).Line()
// common error responses
couldNotParseIPMsg, _ = (&[]ircmsg.IrcMessage{ircmsg.MakeMessage(nil, "", "ERROR", "Unable to parse your IP address")}[0]).Line()
)
const (
rawIONotice = "This server is in debug mode and is logging all user I/O. If you do not wish for everything you send to be readable by the server owner(s), please disconnect."
)
// Limits holds the maximum limits for various things such as topic lengths.
type Limits struct {
AwayLen int
ChannelLen int
KickLen int
MonitorEntries int
NickLen int
TopicLen int
ChanListModes int
LineLen LineLenLimits
}
// LineLenLimits holds the maximum limits for IRC lines.
type LineLenLimits struct {
Tags int
Rest int
}
// ListenerWrapper wraps a listener so it can be safely reconfigured or stopped
type ListenerWrapper struct {
listener net.Listener
tlsConfig *tls.Config
shouldStop bool
// lets the ListenerWrapper inform the server that it has stopped:
stopEvent chan bool
// protects atomic update of tlsConfig and shouldStop:
configMutex sync.Mutex
}
// Server is the main Oragono server.
type Server struct {
accountAuthenticationEnabled bool
accountRegistration *AccountRegistration
accounts map[string]*ClientAccount
channelRegistrationEnabled bool
channels ChannelNameMap
channelJoinPartMutex sync.Mutex // used when joining/parting channels to prevent stomping over each others' access and all
checkIdent bool
clients *ClientLookupSet
commands chan Command
configFilename string
configurableStateMutex sync.RWMutex // generic protection for server state modified by rehash()
connectionLimits *ConnectionLimits
connectionLimitsMutex sync.Mutex // used when affecting the connection limiter, to make sure rehashing doesn't make things go out-of-whack
connectionThrottle *ConnectionThrottle
connectionThrottleMutex sync.Mutex // used when affecting the connection limiter, to make sure rehashing doesn't make things go out-of-whack
ctime time.Time
defaultChannelModes Modes
dlines *DLineManager
loggingRawIO bool
isupport *isupport.List
klines *KLineManager
limits Limits
listeners map[string]*ListenerWrapper
logger *logger.Manager
MaxSendQBytes uint64
monitorManager *MonitorManager
motdLines []string
name string
nameCasefolded string
networkName string
newConns chan clientConn
operators map[string]Oper
operclasses map[string]OperClass
password []byte
passwords *passwd.SaltedManager
registeredChannels map[string]*RegisteredChannel
registeredChannelsMutex sync.RWMutex
rehashMutex sync.Mutex
rehashSignal chan os.Signal
proxyAllowedFrom []string
signals chan os.Signal
snomasks *SnoManager
store *buntdb.DB
stsEnabled bool
whoWas *WhoWasList
}
var (
// ServerExitSignals are the signals the server will exit on.
ServerExitSignals = []os.Signal{
syscall.SIGINT,
syscall.SIGTERM,
syscall.SIGQUIT,
}
)
type clientConn struct {
Conn net.Conn
IsTLS bool
}
// NewServer returns a new Oragono server.
func NewServer(config *Config, logger *logger.Manager) (*Server, error) {
// TODO move this to main?
if err := GenerateHelpIndices(); err != nil {
return nil, err
}
// initialize data structures
server := &Server{
accounts: make(map[string]*ClientAccount),
channels: *NewChannelNameMap(),
clients: NewClientLookupSet(),
commands: make(chan Command),
listeners: make(map[string]*ListenerWrapper),
logger: logger,
monitorManager: NewMonitorManager(),
newConns: make(chan clientConn),
registeredChannels: make(map[string]*RegisteredChannel),
rehashSignal: make(chan os.Signal, 1),
signals: make(chan os.Signal, len(ServerExitSignals)),
snomasks: NewSnoManager(),
whoWas: NewWhoWasList(config.Limits.WhowasEntries),
}
if err := server.applyConfig(config, true); err != nil {
return nil, err
}
// Attempt to clean up when receiving these signals.
signal.Notify(server.signals, ServerExitSignals...)
signal.Notify(server.rehashSignal, syscall.SIGHUP)
return server, nil
}
// setISupport sets up our RPL_ISUPPORT reply.
func (server *Server) setISupport() {
maxTargetsString := strconv.Itoa(maxTargets)
server.configurableStateMutex.RLock()
// add RPL_ISUPPORT tokens
isupport := isupport.NewList()
isupport.Add("AWAYLEN", strconv.Itoa(server.limits.AwayLen))
isupport.Add("CASEMAPPING", casemappingName)
isupport.Add("CHANMODES", strings.Join([]string{Modes{BanMask, ExceptMask, InviteMask}.String(), "", Modes{UserLimit, Key}.String(), Modes{InviteOnly, Moderated, NoOutside, OpOnlyTopic, ChanRoleplaying, Secret}.String()}, ","))
isupport.Add("CHANNELLEN", strconv.Itoa(server.limits.ChannelLen))
isupport.Add("CHANTYPES", "#")
isupport.Add("ELIST", "U")
isupport.Add("EXCEPTS", "")
isupport.Add("INVEX", "")
isupport.Add("KICKLEN", strconv.Itoa(server.limits.KickLen))
isupport.Add("MAXLIST", fmt.Sprintf("beI:%s", strconv.Itoa(server.limits.ChanListModes)))
isupport.Add("MAXTARGETS", maxTargetsString)
isupport.Add("MODES", "")
isupport.Add("MONITOR", strconv.Itoa(server.limits.MonitorEntries))
isupport.Add("NETWORK", server.networkName)
isupport.Add("NICKLEN", strconv.Itoa(server.limits.NickLen))
isupport.Add("PREFIX", "(qaohv)~&@%+")
isupport.Add("RPCHAN", "E")
isupport.Add("RPUSER", "E")
isupport.Add("STATUSMSG", "~&@%+")
isupport.Add("TARGMAX", fmt.Sprintf("NAMES:1,LIST:1,KICK:1,WHOIS:1,USERHOST:10,PRIVMSG:%s,TAGMSG:%s,NOTICE:%s,MONITOR:", maxTargetsString, maxTargetsString, maxTargetsString))
isupport.Add("TOPICLEN", strconv.Itoa(server.limits.TopicLen))
// account registration
if server.accountRegistration.Enabled {
// 'none' isn't shown in the REGCALLBACKS vars
var enabledCallbacks []string
for _, name := range server.accountRegistration.EnabledCallbacks {
if name != "*" {
enabledCallbacks = append(enabledCallbacks, name)
}
}
isupport.Add("REGCOMMANDS", "CREATE,VERIFY")
isupport.Add("REGCALLBACKS", strings.Join(enabledCallbacks, ","))
isupport.Add("REGCREDTYPES", "passphrase,certfp")
}
server.configurableStateMutex.RUnlock()
isupport.RegenerateCachedReply()
server.configurableStateMutex.Lock()
server.isupport = isupport
server.configurableStateMutex.Unlock()
}
func loadChannelList(channel *Channel, list string, maskMode Mode) {
if list == "" {
return
}
channel.lists[maskMode].AddAll(strings.Split(list, " "))
}
// Shutdown shuts down the server.
func (server *Server) Shutdown() {
//TODO(dan): Make sure we disallow new nicks
server.clients.ByNickMutex.RLock()
for _, client := range server.clients.ByNick {
client.Notice("Server is shutting down")
}
server.clients.ByNickMutex.RUnlock()
if err := server.store.Close(); err != nil {
server.logger.Error("shutdown", fmt.Sprintln("Could not close datastore:", err))
}
}
// Run starts the server.
func (server *Server) Run() {
// defer closing db/store
defer server.store.Close()
done := false
for !done {
select {
case <-server.signals:
server.Shutdown()
done = true
case <-server.rehashSignal:
server.logger.Info("rehash", "Rehashing due to SIGHUP")
go func() {
err := server.rehash()
if err != nil {
server.logger.Error("rehash", fmt.Sprintln("Failed to rehash:", err.Error()))
}
}()
case conn := <-server.newConns:
// check IP address
ipaddr := net.ParseIP(utils.IPString(conn.Conn.RemoteAddr()))
if ipaddr == nil {
conn.Conn.Write([]byte(couldNotParseIPMsg))
conn.Conn.Close()
continue
}
isBanned, banMsg := server.checkBans(ipaddr)
if isBanned {
// this might not show up properly on some clients, but our objective here is just to close the connection out before it has a load impact on us
conn.Conn.Write([]byte(fmt.Sprintf(errorMsg, banMsg)))
conn.Conn.Close()
continue
}
server.logger.Debug("localconnect-ip", fmt.Sprintf("Client connecting from %v", ipaddr))
// prolly don't need to alert snomasks on this, only on connection reg
go NewClient(server, conn.Conn, conn.IsTLS)
continue
}
}
}
func (server *Server) checkBans(ipaddr net.IP) (banned bool, message string) {
// check DLINEs
isBanned, info := server.dlines.CheckIP(ipaddr)
if isBanned {
return true, info.BanMessage("You are banned from this server (%s)")
}
// check connection limits
server.connectionLimitsMutex.Lock()
err := server.connectionLimits.AddClient(ipaddr, false)
server.connectionLimitsMutex.Unlock()
if err != nil {
// too many connections from one client, tell the client and close the connection
return true, "Too many clients from your network"
}
// check connection throttle
server.connectionThrottleMutex.Lock()
err = server.connectionThrottle.AddClient(ipaddr)
server.connectionThrottleMutex.Unlock()
if err != nil {
// too many connections too quickly from client, tell them and close the connection
length := &IPRestrictTime{
Duration: server.connectionThrottle.BanDuration,
Expires: time.Now().Add(server.connectionThrottle.BanDuration),
}
server.dlines.AddIP(ipaddr, length, server.connectionThrottle.BanMessage, "Exceeded automated connection throttle")
// they're DLINE'd for 15 minutes or whatever, so we can reset the connection throttle now,
// and once their temporary DLINE is finished they can fill up the throttler again
server.connectionThrottle.ResetFor(ipaddr)
// this might not show up properly on some clients, but our objective here is just to close it out before it has a load impact on us
return true, server.connectionThrottle.BanMessage
}
return false, ""
}
//
// IRC protocol listeners
//
// createListener starts the given listeners.
func (server *Server) createListener(addr string, tlsConfig *tls.Config) *ListenerWrapper {
// make listener
listener, err := net.Listen("tcp", addr)
if err != nil {
log.Fatal(server, "listen error: ", err)
}
// throw our details to the server so we can be modified/killed later
wrapper := ListenerWrapper{
listener: listener,
tlsConfig: tlsConfig,
shouldStop: false,
stopEvent: make(chan bool, 1),
}
var shouldStop bool
// setup accept goroutine
go func() {
for {
conn, err := listener.Accept()
// synchronously access config data:
// whether TLS is enabled and whether we should stop listening
wrapper.configMutex.Lock()
shouldStop = wrapper.shouldStop
tlsConfig = wrapper.tlsConfig
wrapper.configMutex.Unlock()
if err == nil {
if tlsConfig != nil {
conn = tls.Server(conn, tlsConfig)
}
newConn := clientConn{
Conn: conn,
IsTLS: tlsConfig != nil,
}
// hand off the connection
server.newConns <- newConn
}
if shouldStop {
listener.Close()
wrapper.stopEvent <- true
return
}
}
}()
return &wrapper
}
// generateMessageID returns a network-unique message ID.
func (server *Server) generateMessageID() string {
return fmt.Sprintf("%s-%s", strconv.FormatInt(time.Now().UTC().UnixNano(), 10), strconv.FormatInt(rand.Int63(), 10))
}
//
// server functionality
//
func (server *Server) tryRegister(c *Client) {
if c.registered || !c.HasNick() || !c.HasUsername() ||
(c.capState == CapNegotiating) {
return
}
// check KLINEs
isBanned, info := server.klines.CheckMasks(c.AllNickmasks()...)
if isBanned {
reason := info.Reason
if info.Time != nil {
reason += fmt.Sprintf(" [%s]", info.Time.Duration.String())
}
c.Send(nil, "", "ERROR", fmt.Sprintf("You are banned from this server (%s)", reason))
c.quitMessageSent = true
c.destroy()
return
}
// continue registration
server.logger.Debug("localconnect", fmt.Sprintf("Client registered [%s] [u:%s] [r:%s]", c.nick, c.username, c.realname))
server.snomasks.Send(sno.LocalConnects, fmt.Sprintf(ircfmt.Unescape("Client registered $c[grey][$r%s$c[grey]] [u:$r%s$c[grey]] [h:$r%s$c[grey]] [r:$r%s$c[grey]]"), c.nick, c.username, c.rawHostname, c.realname))
c.Register()
// send welcome text
//NOTE(dan): we specifically use the NICK here instead of the nickmask
// see http://modern.ircdocs.horse/#rplwelcome-001 for details on why we avoid using the nickmask
c.Send(nil, server.name, RPL_WELCOME, c.nick, fmt.Sprintf("Welcome to the Internet Relay Network %s", c.nick))
c.Send(nil, server.name, RPL_YOURHOST, c.nick, fmt.Sprintf("Your host is %s, running version %s", server.name, Ver))
c.Send(nil, server.name, RPL_CREATED, c.nick, fmt.Sprintf("This server was created %s", server.ctime.Format(time.RFC1123)))
//TODO(dan): Look at adding last optional [<channel modes with a parameter>] parameter
c.Send(nil, server.name, RPL_MYINFO, c.nick, server.name, Ver, supportedUserModesString, supportedChannelModesString)
c.RplISupport()
server.MOTD(c)
c.Send(nil, c.nickMaskString, RPL_UMODEIS, c.nick, c.ModeString())
if server.logger.IsLoggingRawIO() {
c.Notice(rawIONotice)
}
}
// MOTD serves the Message of the Day.
func (server *Server) MOTD(client *Client) {
server.configurableStateMutex.RLock()
motdLines := server.motdLines
server.configurableStateMutex.RUnlock()
if len(motdLines) < 1 {
client.Send(nil, server.name, ERR_NOMOTD, client.nick, "MOTD File is missing")
return
}
client.Send(nil, server.name, RPL_MOTDSTART, client.nick, fmt.Sprintf("- %s Message of the day - ", server.name))
for _, line := range motdLines {
client.Send(nil, server.name, RPL_MOTD, client.nick, line)
}
client.Send(nil, server.name, RPL_ENDOFMOTD, client.nick, "End of MOTD command")
}
//
// registration commands
//
// PASS <password>
func passHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
if client.registered {
client.Send(nil, server.name, ERR_ALREADYREGISTRED, client.nick, "You may not reregister")
return false
}
// if no password exists, skip checking
if len(server.password) == 0 {
client.authorized = true
return false
}
// check the provided password
password := []byte(msg.Params[0])
if passwd.ComparePassword(server.password, password) != nil {
client.Send(nil, server.name, ERR_PASSWDMISMATCH, client.nick, "Password incorrect")
client.Send(nil, server.name, "ERROR", "Password incorrect")
return true
}
client.authorized = true
return false
}
// USER <username> * 0 <realname>
func userHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
if client.registered {
client.Send(nil, server.name, ERR_ALREADYREGISTRED, client.nick, "You may not reregister")
return false
}
if !client.authorized {
client.Quit("Bad password")
return true
}
if client.username != "" && client.realname != "" {
return false
}
// confirm that username is valid
//
_, err := CasefoldName(msg.Params[0])
if err != nil {
client.Send(nil, "", "ERROR", "Malformed username")
return true
}
if !client.HasUsername() {
client.username = "~" + msg.Params[0]
// don't bother updating nickmask here, it's not valid anyway
}
if client.realname == "" {
client.realname = msg.Params[3]
}
server.tryRegister(client)
return false
}
// QUIT [<reason>]
func quitHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
reason := "Quit"
if len(msg.Params) > 0 {
reason += ": " + msg.Params[0]
}
client.Quit(reason)
return true
}
//
// normal commands
//
// PING <server1> [<server2>]
func pingHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
client.Send(nil, server.name, "PONG", msg.Params...)
return false
}
// PONG <server> [ <server2> ]
func pongHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
// client gets touched when they send this command, so we don't need to do anything
return false
}
// RENAME <oldchan> <newchan> [<reason>]
//TODO(dan): Clean up this function so it doesn't look like an eldrich horror... prolly by putting it into a server.renameChannel function.
func renameHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
// get lots of locks... make sure nobody touches anything while we're doing this
server.registeredChannelsMutex.Lock()
defer server.registeredChannelsMutex.Unlock()
server.channels.ChansLock.Lock()
defer server.channels.ChansLock.Unlock()
oldName := strings.TrimSpace(msg.Params[0])
newName := strings.TrimSpace(msg.Params[1])
reason := "No reason"
if 2 < len(msg.Params) {
reason = msg.Params[2]
}
// check for all the reasons why the rename couldn't happen
casefoldedOldName, err := CasefoldChannel(oldName)
if err != nil {
//TODO(dan): Change this to ERR_CANNOTRENAME
client.Send(nil, server.name, ERR_UNKNOWNERROR, client.nick, "RENAME", oldName, "Old channel name is invalid")
return false
}
channel := server.channels.Chans[casefoldedOldName]
if channel == nil {
client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, oldName, "No such channel")
return false
}
//TODO(dan): allow IRCops to do this?
if !channel.ClientIsAtLeast(client, Operator) {
client.Send(nil, server.name, ERR_CHANOPRIVSNEEDED, client.nick, oldName, "Only chanops can rename channels")
return false
}
channel.membersMutex.Lock()
defer channel.membersMutex.Unlock()
casefoldedNewName, err := CasefoldChannel(newName)
if err != nil {
//TODO(dan): Change this to ERR_CANNOTRENAME
client.Send(nil, server.name, ERR_UNKNOWNERROR, client.nick, "RENAME", newName, "New channel name is invalid")
return false
}
newChannel := server.channels.Chans[casefoldedNewName]
if newChannel != nil {
//TODO(dan): Change this to ERR_CHANNAMEINUSE
client.Send(nil, server.name, ERR_UNKNOWNERROR, client.nick, "RENAME", newName, "New channel name is in use")
return false
}
var canEdit bool
server.store.Update(func(tx *buntdb.Tx) error {
chanReg := server.loadChannelNoMutex(tx, casefoldedOldName)
if chanReg == nil || !client.LoggedIntoAccount() || client.account.Name == chanReg.Founder {
canEdit = true
}
chanReg = server.loadChannelNoMutex(tx, casefoldedNewName)
if chanReg != nil {
canEdit = false
}
return nil
})
if !canEdit {
//TODO(dan): Change this to ERR_CANNOTRENAME
client.Send(nil, server.name, ERR_UNKNOWNERROR, client.nick, "RENAME", oldName, "Only channel founders can change registered channels")
return false
}
// perform the channel rename
server.channels.Chans[casefoldedOldName] = nil
server.channels.Chans[casefoldedNewName] = channel
channel.name = strings.TrimSpace(msg.Params[1])
channel.nameCasefolded = casefoldedNewName
// rename stored channel info if any exists
server.store.Update(func(tx *buntdb.Tx) error {
chanReg := server.loadChannelNoMutex(tx, casefoldedOldName)
if chanReg == nil {
return nil
}
server.deleteChannelNoMutex(tx, casefoldedOldName)
chanReg.Name = newName
server.saveChannelNoMutex(tx, casefoldedNewName, *chanReg)
return nil
})
// send RENAME messages
for mcl := range channel.members {
if mcl.capabilities.Has(caps.Rename) {
mcl.Send(nil, client.nickMaskString, "RENAME", oldName, newName, reason)
} else {
mcl.Send(nil, mcl.nickMaskString, "PART", oldName, fmt.Sprintf("Channel renamed: %s", reason))
if mcl.capabilities.Has(caps.ExtendedJoin) {
accountName := "*"
if mcl.account != nil {
accountName = mcl.account.Name
}
mcl.Send(nil, mcl.nickMaskString, "JOIN", newName, accountName, mcl.realname)
} else {
mcl.Send(nil, mcl.nickMaskString, "JOIN", newName)
}
}
}
return false
}
// JOIN <channel>{,<channel>} [<key>{,<key>}]
func joinHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
// kill JOIN 0 requests
if msg.Params[0] == "0" {
client.Notice("JOIN 0 is not allowed")
return false
}
// handle regular JOINs
channels := strings.Split(msg.Params[0], ",")
var keys []string
if len(msg.Params) > 1 {
keys = strings.Split(msg.Params[1], ",")
}
// get lock
server.channelJoinPartMutex.Lock()
defer server.channelJoinPartMutex.Unlock()
for i, name := range channels {
casefoldedName, err := CasefoldChannel(name)
if err != nil {
if len(name) > 0 {
client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, name, "No such channel")
}
continue
}
channel := server.channels.Get(casefoldedName)
if channel == nil {
if len(casefoldedName) > server.getLimits().ChannelLen {
client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, name, "No such channel")
continue
}
channel = NewChannel(server, name, true)
}
var key string
if len(keys) > i {
key = keys[i]
}
channel.Join(client, key)
}
return false
}
// PART <channel>{,<channel>} [<reason>]
func partHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
channels := strings.Split(msg.Params[0], ",")
var reason string //TODO(dan): if this isn't supplied here, make sure the param doesn't exist in the PART message sent to other users
if len(msg.Params) > 1 {
reason = msg.Params[1]
}
// get lock
server.channelJoinPartMutex.Lock()
defer server.channelJoinPartMutex.Unlock()
for _, chname := range channels {
casefoldedChannelName, err := CasefoldChannel(chname)
channel := server.channels.Get(casefoldedChannelName)
if err != nil || channel == nil {
if len(chname) > 0 {
client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, chname, "No such channel")
}
continue
}
channel.Part(client, reason)
}
return false
}
// TOPIC <channel> [<topic>]
func topicHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
name, err := CasefoldChannel(msg.Params[0])
channel := server.channels.Get(name)
if err != nil || channel == nil {
if len(msg.Params[0]) > 0 {
client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, msg.Params[0], "No such channel")
}
return false
}
if len(msg.Params) > 1 {
channel.SetTopic(client, msg.Params[1])
} else {
channel.GetTopic(client)
}
return false
}
// wordWrap wraps the given text into a series of lines that don't exceed lineWidth characters.
func wordWrap(text string, lineWidth int) []string {
var lines []string
var cacheLine, cacheWord string
for _, char := range text {
if char == '\r' {
continue
} else if char == '\n' {
cacheLine += cacheWord
lines = append(lines, cacheLine)
cacheWord = ""
cacheLine = ""
} else if (char == ' ' || char == '-') && len(cacheLine)+len(cacheWord)+1 < lineWidth {
// natural word boundary
cacheLine += cacheWord + string(char)
cacheWord = ""
} else if lineWidth <= len(cacheLine)+len(cacheWord)+1 {
// time to wrap to next line
if len(cacheLine) < (lineWidth / 2) {
// this word takes up more than half a line... just split in the middle of the word
cacheLine += cacheWord + string(char)
cacheWord = ""
} else {
cacheWord += string(char)
}
lines = append(lines, cacheLine)
cacheLine = ""
} else {
// normal character
cacheWord += string(char)
}
}
if 0 < len(cacheWord) {
cacheLine += cacheWord
}
if 0 < len(cacheLine) {
lines = append(lines, cacheLine)
}
return lines
}
// SplitMessage represents a message that's been split for sending.
type SplitMessage struct {
For512 []string
ForMaxLine string
}
func (server *Server) splitMessage(original string, origIs512 bool) SplitMessage {
var newSplit SplitMessage
newSplit.ForMaxLine = original
if !origIs512 {
newSplit.For512 = wordWrap(original, 400)
} else {
newSplit.For512 = []string{original}
}
return newSplit
}
// PRIVMSG <target>{,<target>} <message>
func privmsgHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
clientOnlyTags := GetClientOnlyTags(msg.Tags)
targets := strings.Split(msg.Params[0], ",")
message := msg.Params[1]
// split privmsg
splitMsg := server.splitMessage(message, !client.capabilities.Has(caps.MaxLine))
for i, targetString := range targets {
// max of four targets per privmsg
if i > maxTargets-1 {
break
}
prefixes, targetString := SplitChannelMembershipPrefixes(targetString)
lowestPrefix := GetLowestChannelModePrefix(prefixes)
// eh, no need to notify them
if len(targetString) < 1 {
continue
}
target, err := CasefoldChannel(targetString)
if err == nil {
channel := server.channels.Get(target)
if channel == nil {
client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, targetString, "No such channel")
continue
}
if !channel.CanSpeak(client) {
client.Send(nil, client.server.name, ERR_CANNOTSENDTOCHAN, channel.name, "Cannot send to channel")
continue
}
msgid := server.generateMessageID()
channel.SplitPrivMsg(msgid, lowestPrefix, clientOnlyTags, client, splitMsg)
} else {
target, err = CasefoldName(targetString)
if target == "chanserv" {
server.chanservReceivePrivmsg(client, message)
continue
} else if target == "nickserv" {
server.nickservReceivePrivmsg(client, message)
continue
}
user := server.clients.Get(target)
if err != nil || user == nil {
if len(target) > 0 {
client.Send(nil, server.name, ERR_NOSUCHNICK, client.nick, target, "No such nick")
}
continue
}
if !user.capabilities.Has(caps.MessageTags) {
clientOnlyTags = nil
}
msgid := server.generateMessageID()
// restrict messages appropriately when +R is set
// intentionally make the sending user think the message went through fine
if !user.flags[RegisteredOnly] || client.registered {
user.SendSplitMsgFromClient(msgid, client, clientOnlyTags, "PRIVMSG", user.nick, splitMsg)
}
if client.capabilities.Has(caps.EchoMessage) {
client.SendSplitMsgFromClient(msgid, client, clientOnlyTags, "PRIVMSG", user.nick, splitMsg)
}
if user.flags[Away] {
//TODO(dan): possibly implement cooldown of away notifications to users
client.Send(nil, server.name, RPL_AWAY, user.nick, user.awayMessage)
}
}
}
return false
}
// TAGMSG <target>{,<target>}
func tagmsgHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
clientOnlyTags := GetClientOnlyTags(msg.Tags)
// no client-only tags, so we can drop it
if clientOnlyTags == nil {
return false
}
targets := strings.Split(msg.Params[0], ",")
for i, targetString := range targets {
// max of four targets per privmsg
if i > maxTargets-1 {
break
}
prefixes, targetString := SplitChannelMembershipPrefixes(targetString)
lowestPrefix := GetLowestChannelModePrefix(prefixes)
// eh, no need to notify them
if len(targetString) < 1 {
continue
}
target, err := CasefoldChannel(targetString)
if err == nil {
channel := server.channels.Get(target)
if channel == nil {
client.Send(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, targetString, "No such channel")
continue
}
if !channel.CanSpeak(client) {
client.Send(nil, client.server.name, ERR_CANNOTSENDTOCHAN, channel.name, "Cannot send to channel")
continue
}
msgid := server.generateMessageID()
channel.TagMsg(msgid, lowestPrefix, clientOnlyTags, client)
} else {
target, err = CasefoldName(targetString)
user := server.clients.Get(target)
if err != nil || user == nil {
if len(target) > 0 {
client.Send(nil, server.name, ERR_NOSUCHNICK, client.nick, target, "No such nick")
}
continue
}
msgid := server.generateMessageID()
// end user can't receive tagmsgs
if !user.capabilities.Has(caps.MessageTags) {
continue
}
user.SendFromClient(msgid, client, clientOnlyTags, "TAGMSG", user.nick)
if client.capabilities.Has(caps.EchoMessage) {
client.SendFromClient(msgid, client, clientOnlyTags, "TAGMSG", user.nick)
}
if user.flags[Away] {
//TODO(dan): possibly implement cooldown of away notifications to users
client.Send(nil, server.name, RPL_AWAY, user.nick, user.awayMessage)
}
}
}
return false
}
// WhoisChannelsNames returns the common channel names between two users.
func (client *Client) WhoisChannelsNames(target *Client) []string {
isMultiPrefix := target.capabilities.Has(caps.MultiPrefix)
var chstrs []string
index := 0
for channel := range client.channels {
channel.membersMutex.RLock()
defer channel.membersMutex.RUnlock()
// channel is secret and the target can't see it
if !target.flags[Operator] && channel.flags[Secret] && !channel.members.Has(target) {
continue
}
chstrs = append(chstrs, channel.members[client].Prefixes(isMultiPrefix)+channel.name)
index++
}
return chstrs
}
// WHOIS [ <target> ] <mask> *( "," <mask> )
func whoisHandler(server *Server, client *Client, msg ircmsg.IrcMessage) bool {
var masksString string
//var target string
if len(msg.Params) > 1 {
//target = msg.Params[0]
masksString = msg.Params[1]
} else {
masksString = msg.Params[0]
}
if len(strings.TrimSpace(masksString)) < 1 {
client.Send(nil, server.name, ERR_UNKNOWNERROR, client.nick, msg.Command, "No masks given")
return false
}
if client.flags[Operator] {
masks := strings.Split(masksString, ",")
for _, mask := range masks {
casefoldedMask, err := Casefold(mask)
if err != nil {