458 lines
11 KiB
Go
458 lines
11 KiB
Go
// vim:ts=4:sts=4:sw=4:noet:tw=72
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package ircd
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import (
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"crypto/rand"
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"crypto/tls"
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"fmt"
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"net"
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"os"
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"strings"
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"time"
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"code.dnix.de/an/conf"
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"code.dnix.de/an/irc"
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"code.dnix.de/an/xlog"
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)
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const (
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CHANLIMIT = 1024
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CHANNELLEN = 200
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TOPICLEN = 1024
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)
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var myinfo string = "%s %s/%s * *"
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var isupport string = "CASEMAPPING=rfc1459 CHANTYPES=# NICKLEN=32 MODES=1 PREFIX=(ohv)@%+"
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type Server struct {
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localq chan *irc.Message
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remoteq chan *irc.Message
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addq chan Client
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delq chan Client
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host string
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info string
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software string
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version string
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created string
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motd string
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cluster *ClusterConnector
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opers map[string]string
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clients map[string]Client
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clModes map[string]string
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chUsers map[string]map[string]string
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chTopics map[string]string
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chModes map[string]map[string]bool
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config *conf.ConfigFile
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configPath string
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packetsTransferred float64
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connectionsCount float64
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authCallback func(name, pass string) bool
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}
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func NewServer(configPath, software, version string) *Server {
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sv := &Server{software: software, version: version,
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created: time.Now().String()}
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sv.localq = make(chan *irc.Message, 65536)
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sv.remoteq = make(chan *irc.Message, 65536)
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sv.addq = make(chan Client, 128)
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sv.delq = make(chan Client, 128)
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sv.opers = make(map[string]string)
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sv.clients = make(map[string]Client)
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sv.clModes = make(map[string]string)
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sv.chUsers = make(map[string]map[string]string)
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sv.chTopics = make(map[string]string)
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sv.chModes = make(map[string]map[string]bool)
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sv.configPath = configPath
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sv.loadConfig()
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loglevel, _ := sv.config.GetInt("system", "loglevel")
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xlog.Init(loglevel)
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sv.host, _ = sv.config.GetString("server", "host")
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sv.info, _ = sv.config.GetString("server", "info")
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sv.motd, _ = sv.config.GetString("server", "motd")
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urls, _ := sv.config.GetString("cluster", "urls")
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sv.cluster = NewClusterConnector(urls, false)
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nicks, _ := sv.config.GetString("control", "a")
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for _, nick := range strings.Split(nicks, ",") {
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sv.opers[nick] = "a"
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}
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nicks, _ = sv.config.GetString("control", "o")
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for _, nick := range strings.Split(nicks, ",") {
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sv.opers[nick] = "o"
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}
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sv.packetsTransferred = 0
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sv.connectionsCount = 0
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return sv
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}
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func (sv *Server) SetAuthCallback(authCB func(name, pass string) bool) {
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sv.authCallback = authCB
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}
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func (sv *Server) Run() {
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xlog.Info("%s/%s", sv.software, sv.version)
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go monitoringRun(sv)
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laddr, err := sv.config.GetString("net", "listen")
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if err == nil {
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go sv.listen(laddr)
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}
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tls := true
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pem, err := sv.config.GetString("tls", "pem")
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if err != nil {
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tls = false
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}
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key, err := sv.config.GetString("tls", "key")
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if err != nil {
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tls = false
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}
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laddr, err = sv.config.GetString("net", "listen_tls")
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if err == nil && tls {
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go sv.listenTls(laddr, pem, key)
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}
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for {
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err = sv.dispatcher()
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if err != nil {
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xlog.Error("Dispatcher in panic: %s", err.Error())
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}
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}
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}
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func (sv *Server) Dispatch(msg *irc.Message) {
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sv.localq <- msg
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}
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func (sv *Server) AddClient(cl Client) {
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sv.addq <- cl
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}
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func (sv *Server) DelClient(cl Client) {
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sv.delq <- cl
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}
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func (sv *Server) listen(laddr string) {
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listen, err := net.Listen("tcp", laddr)
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if err != nil {
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xlog.Fatal(err.Error())
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os.Exit(-1)
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}
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for {
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time.Sleep(10 * time.Millisecond)
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conn, err := listen.Accept()
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if err != nil {
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xlog.Error(err.Error())
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} else {
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NewRemoteClient(sv, conn)
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sv.connectionsCount++
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}
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}
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}
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func (sv *Server) listenTls(laddr, pem, key string) {
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cert, err := tls.LoadX509KeyPair(pem, key)
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if err != nil {
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xlog.Fatal(err.Error())
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}
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cfg := tls.Config{Certificates: []tls.Certificate{cert}}
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cfg.Rand = rand.Reader
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listen, err := tls.Listen("tcp", laddr, &cfg)
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if err != nil {
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xlog.Fatal(err.Error())
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}
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for {
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time.Sleep(10 * time.Millisecond)
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conn, err := listen.Accept()
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if err != nil {
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xlog.Error(err.Error())
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} else {
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NewRemoteClient(sv, conn)
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sv.connectionsCount++
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}
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}
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}
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func (sv *Server) dispatcher() (err error) {
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defer func() {
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if r := recover(); r != nil {
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var ok bool
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err, ok = r.(error)
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if !ok {
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err = fmt.Errorf("pkg: %v", r)
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}
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}
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}()
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for {
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select {
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case msg := <-sv.localq:
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sv.recvMsg(msg)
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sv.packetsTransferred++
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case msg := <-sv.remoteq:
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if sv.localOrigin(msg) {
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continue
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}
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sv.recvMsg(msg)
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sv.packetsTransferred++
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case cl := <-sv.addq:
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sv.addClient(cl)
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case cl := <-sv.delq:
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sv.delClient(cl)
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default:
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time.Sleep(100 * time.Microsecond)
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}
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}
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return
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}
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func (sv *Server) loadConfig() {
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cfg, err := conf.ReadConfigFile(sv.configPath)
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if err != nil {
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xlog.Fatal("Can't read config file (%s)", err.Error())
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os.Exit(-1)
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}
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sv.config = cfg
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}
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func (sv *Server) addClient(cl Client) {
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clid := strings.ToLower(cl.Name())
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if _, exists := sv.clients[clid]; exists {
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cl.Receive(irc.M(sv.host, ERR_NICKNAMEINUSE, cl.Name(), "Nickname is already in use"))
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go func() {
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time.Sleep(5 * time.Second)
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cl.Register(false)
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}()
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xlog.Info("Client registration failed: '%s' (client exists)", clid)
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return
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}
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if !sv.authCallback(cl.Name(), cl.Password()) {
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cl.Receive(irc.M(sv.host, ERR_PASSWDMISMATCH, "", "Password incorrect"))
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go func() {
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time.Sleep(5 * time.Second)
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cl.Register(false)
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}()
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xlog.Info("Client registration failed: '%s' (wrong password)", clid)
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return
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}
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sv.clients[clid] = cl
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sv.sendLogon(cl.Name())
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cl.Register(true)
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sv.cluster.Subscribe(clid, sv.remoteq)
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xlog.Info("Client registered: '%s'", clid)
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xlog.Info("Server has %d client(s)", len(sv.clients))
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}
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func (sv *Server) delClient(cl Client) {
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clid := strings.ToLower(cl.Name())
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sv.cluster.Unsubscribe(clid)
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cl.Destroy()
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for chid, _ := range sv.chUsers {
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if _, exists := sv.chUsers[chid][clid]; exists {
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sv.channelRemoveUser(chid, clid)
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sv.sendMsg(irc.M(cl.Name(), "PART", chid, "quit"))
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}
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}
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delete(sv.clients, clid)
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xlog.Info("Client deleted: '%s'", clid)
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xlog.Info("Server has %d client(s)", len(sv.clients))
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}
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func (sv *Server) recvMsg(msg *irc.Message) {
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cmd := msg.Cmd
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clid := strings.ToLower(msg.Pre)
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hook, exists := svCommandHooks[cmd]
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if !exists {
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sv.sendReply(msg.Pre, ERR_UNKNOWNCOMMAND, cmd, "Unknown command")
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return
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}
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nm := hook.NeedMode
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if nm != "" {
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if m, isoper := sv.opers[clid]; !isoper {
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sv.sendReply(msg.Pre, ERR_NOPRIVILEGES, cmd, "Permission denied: You're not a server operator")
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return
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} else {
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if strings.Index(nm, m) == -1 {
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sv.sendReply(msg.Pre, ERR_NOPRIVILEGES, cmd, "Permission denied: You're not a server admin")
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return
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}
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}
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}
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argc := len(msg.Args)
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if argc < hook.MinArgs {
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sv.sendReply(msg.Pre, ERR_NEEDMOREPARAMS, cmd, "Not enough parameters")
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return
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}
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if hook.NeedTrail && msg.Trail == "" {
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sv.sendReply(msg.Pre, ERR_NEEDMOREPARAMS, cmd, "Not enough parameters")
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return
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}
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hook.HookFn(sv, msg)
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}
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func (sv *Server) sendMsg(msg *irc.Message) {
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sv.deliverMsg(msg)
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sv.forwardMsg(msg)
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}
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func (sv *Server) deliverMsg(msg *irc.Message) {
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if strings.HasPrefix(msg.Args[0], "#") {
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chid := strings.ToLower(msg.Args[0])
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if _, exists := sv.chUsers[chid]; !exists {
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sv.sendReply(msg.Pre, ERR_NOSUCHNICK, msg.Args[0], "No such nick/channel")
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return
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}
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for clid, _ := range sv.chUsers[chid] {
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if strings.ToLower(msg.Pre) == clid && msg.Cmd == "PRIVMSG" {
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continue
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}
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if cl, exists := sv.clients[clid]; exists {
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cl.Receive(msg)
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}
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}
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} else {
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clid := strings.ToLower(msg.Args[0])
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if _, exists := sv.clients[clid]; !exists {
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sv.sendReply(msg.Pre, ERR_NOSUCHNICK, msg.Args[0], "No such nick/channel")
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return
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}
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cl := sv.clients[clid]
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cl.Receive(msg)
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}
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}
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func (sv *Server) forwardMsg(msg *irc.Message) {
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if sv.localOrigin(msg) {
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sv.cluster.Publish(msg)
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}
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}
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func (sv *Server) sendReply(nick, cmd, args, trail string) {
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clid := strings.ToLower(nick)
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if _, exists := sv.clients[clid]; !exists {
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return
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}
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cl := sv.clients[clid]
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if args != "" {
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args = nick + " " + args
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} else {
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args = nick
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}
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cl.Receive(irc.M(sv.host, cmd, args, trail))
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}
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func (sv *Server) localOrigin(msg *irc.Message) bool {
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_, localClient := sv.clients[strings.ToLower(msg.Pre)]
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localServer := (msg.Pre == sv.host)
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return localClient || localServer
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}
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func (sv *Server) sendLogon(nick string) {
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sv.sendReply(nick, RPL_WELCOME, "", "Willkommen!")
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sv.sendReply(nick, RPL_YOURHOST, "",
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fmt.Sprintf("Your host is %s, running on %s/%s",
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sv.host, sv.software, sv.version))
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sv.sendReply(nick, RPL_CREATED, "",
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fmt.Sprintf("This server was created %s", sv.created))
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sv.sendReply(nick, RPL_MYINFO, "",
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fmt.Sprintf(myinfo, sv.host, sv.software, sv.version))
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sv.sendReply(nick, RPL_ISUPPORT, "",
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isupport+" are supported by this server")
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sv.sendReply(nick, RPL_MOTDSTART, "",
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fmt.Sprintf("- %s Message of the day -", sv.host))
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for _, line := range strings.Split(sv.motd, "\n") {
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sv.sendReply(nick, RPL_MOTD, "", fmt.Sprintf("- %s", line))
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}
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sv.sendReply(nick, RPL_ENDOFMOTD, "", "End of MOTD command")
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if m, isoper := sv.opers[strings.ToLower(nick)]; isoper {
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switch m {
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case "a":
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sv.sendReply(nick, RPL_YOUREOPER, "", "You are now a server admin")
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case "o":
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sv.sendReply(nick, RPL_YOUREOPER, "", "You are now a server operator")
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}
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}
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}
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func (sv *Server) channelNames(nick, ch string) {
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chid := strings.ToLower(ch)
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if _, exists := sv.chUsers[chid]; !exists {
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return
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}
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names := ""
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for clid, _ := range sv.chUsers[chid] {
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name := sv.clients[clid].Name()
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if names != "" {
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names += " "
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}
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modeFlags := "ohv"
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modeChars := "@%+"
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for i, mf := range modeFlags {
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if _, exists := sv.chModes[chid][string(mf)+" "+clid]; exists {
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name = string(modeChars[i]) + name
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break
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}
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}
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names = names + name
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}
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chunks := len(strings.Split(names, " "))/8 + 1
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nameList := strings.SplitN(names, " ", chunks)
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for _, nameSlice := range nameList {
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sv.sendReply(nick, RPL_NAMEREPLY, "= "+ch, nameSlice)
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}
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sv.sendReply(nick, RPL_ENDOFNAMES, ch, "End of /NAMES list")
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}
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func (sv *Server) channelCheckMode(chid, mode string) bool {
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if _, exists := sv.chModes[chid]; !exists {
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return false
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}
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if _, exists := sv.chModes[chid][mode]; !exists {
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return false
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}
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return true
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}
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func (sv *Server) channelCheckPerm(chid, clid, modes string) bool {
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for _, m := range modes {
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if sv.channelCheckMode(chid, string(m)+" "+clid) {
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return true
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}
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}
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return false
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}
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func (sv *Server) channelRemoveUser(chid, clid string) {
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if _, exists := sv.chUsers[chid]; !exists {
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return
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}
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delete(sv.chUsers[chid], clid)
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delete(sv.chModes[chid], "o "+clid)
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delete(sv.chModes[chid], "h "+clid)
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delete(sv.chModes[chid], "v "+clid)
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if len(sv.chUsers[chid]) == 0 {
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sv.cluster.Unsubscribe(chid)
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delete(sv.chUsers, chid)
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delete(sv.chTopics, chid)
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delete(sv.chModes, chid)
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}
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}
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