450 lines
12 KiB
Go
450 lines
12 KiB
Go
/*
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goircd -- minimalistic simple Internet Relay Chat (IRC) server
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Copyright (C) 2014 Sergey Matveev <stargrave@stargrave.org>
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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package main
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import (
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"fmt"
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"io/ioutil"
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"log"
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"net"
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"regexp"
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"sort"
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"strings"
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"time"
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)
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const (
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PING_TIMEOUT = time.Second * 180 // Max time deadline for client's unresponsiveness
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PING_THRESHOLD = time.Second * 90 // Max idle client's time before PING are sent
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ALIVENESS_CHECK = time.Second * 10 // Client's aliveness check period
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)
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var (
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RE_NICKNAME = regexp.MustCompile("^[a-zA-Z0-9-]{1,9}$")
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)
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type Daemon struct {
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Verbose bool
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hostname string
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motd string
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clients map[*Client]bool
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client_aliveness map[*Client]*ClientAlivenessState
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rooms map[string]*Room
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room_sinks map[*Room]chan ClientEvent
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last_aliveness_check time.Time
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log_sink chan<- LogEvent
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state_sink chan<- StateEvent
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}
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func NewDaemon(hostname, motd string, log_sink chan<- LogEvent, state_sink chan<- StateEvent) *Daemon {
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daemon := Daemon{hostname: hostname, motd: motd}
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daemon.clients = make(map[*Client]bool)
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daemon.client_aliveness = make(map[*Client]*ClientAlivenessState)
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daemon.rooms = make(map[string]*Room)
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daemon.room_sinks = make(map[*Room]chan ClientEvent)
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daemon.log_sink = log_sink
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daemon.state_sink = state_sink
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return &daemon
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}
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func (daemon *Daemon) SendLusers(client *Client) {
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lusers := 0
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for client := range daemon.clients {
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if client.registered {
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lusers++
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}
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}
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client.ReplyNicknamed("251", fmt.Sprintf("There are %d users and 0 invisible on 1 servers", lusers))
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}
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func (daemon *Daemon) SendMotd(client *Client) {
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if len(daemon.motd) == 0 {
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client.ReplyNicknamed("422", "MOTD File is missing")
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return
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}
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motd, err := ioutil.ReadFile(daemon.motd)
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if err != nil {
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log.Printf("Can not read motd file %s: %v", daemon.motd, err)
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client.ReplyNicknamed("422", "Error reading MOTD File")
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return
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}
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client.ReplyNicknamed("375", "- "+daemon.hostname+" Message of the day -")
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for _, s := range strings.Split(strings.Trim(string(motd), "\n"), "\n") {
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client.ReplyNicknamed("372", "- "+string(s))
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}
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client.ReplyNicknamed("376", "End of /MOTD command")
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}
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func (daemon *Daemon) SendWhois(client *Client, nicknames []string) {
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for _, nickname := range nicknames {
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nickname = strings.ToLower(nickname)
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found := false
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for c := range daemon.clients {
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if strings.ToLower(c.nickname) != nickname {
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continue
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}
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found = true
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h := c.conn.RemoteAddr().String()
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h, _, err := net.SplitHostPort(h)
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if err != nil {
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log.Printf("Can't parse RemoteAddr %q: %v", h, err)
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h = "Unknown"
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}
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client.ReplyNicknamed("311", c.nickname, c.username, h, "*", c.realname)
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client.ReplyNicknamed("312", c.nickname, daemon.hostname, daemon.hostname)
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subscriptions := []string{}
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for _, room := range daemon.rooms {
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for subscriber := range room.members {
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if subscriber.nickname == nickname {
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subscriptions = append(subscriptions, room.name)
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}
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}
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}
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sort.Strings(subscriptions)
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client.ReplyNicknamed("319", c.nickname, strings.Join(subscriptions, " "))
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client.ReplyNicknamed("318", c.nickname, "End of /WHOIS list")
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}
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if !found {
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client.ReplyNoNickChan(nickname)
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}
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}
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}
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func (daemon *Daemon) SendList(client *Client, cols []string) {
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var rooms []string
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if (len(cols) > 1) && (cols[1] != "") {
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rooms = strings.Split(strings.Split(cols[1], " ")[0], ",")
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} else {
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rooms = []string{}
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for room := range daemon.rooms {
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rooms = append(rooms, room)
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}
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}
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sort.Strings(rooms)
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for _, room := range rooms {
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r, found := daemon.rooms[room]
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if found {
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client.ReplyNicknamed("322", room, fmt.Sprintf("%d", len(r.members)), r.topic)
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}
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}
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client.ReplyNicknamed("323", "End of /LIST")
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}
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// Unregistered client workflow processor. Unregistered client:
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// * is not PINGed
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// * only QUIT, NICK and USER commands are processed
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// * other commands are quietly ignored
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// When client finishes NICK/USER workflow, then MOTD and LUSERS are send to him.
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func (daemon *Daemon) ClientRegister(client *Client, command string, cols []string) {
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switch command {
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case "NICK":
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if len(cols) == 1 || len(cols[1]) < 1 {
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client.ReplyParts("431", "No nickname given")
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return
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}
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nickname := cols[1]
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for existing_client := range daemon.clients {
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if existing_client.nickname == nickname {
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client.ReplyParts("433", "*", nickname, "Nickname is already in use")
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return
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}
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}
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if !RE_NICKNAME.MatchString(nickname) {
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client.ReplyParts("432", "*", cols[1], "Erroneous nickname")
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return
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}
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client.nickname = nickname
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case "USER":
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if len(cols) == 1 {
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client.ReplyNotEnoughParameters("USER")
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return
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}
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args := strings.SplitN(cols[1], " ", 4)
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if len(args) < 4 {
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client.ReplyNotEnoughParameters("USER")
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return
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}
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client.username = args[0]
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client.realname = strings.TrimLeft(args[3], ":")
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}
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if client.nickname != "*" && client.username != "" {
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client.registered = true
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client.ReplyNicknamed("001", "Hi, welcome to IRC")
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client.ReplyNicknamed("002", "Your host is "+daemon.hostname+", running goircd")
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client.ReplyNicknamed("003", "This server was created sometime")
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client.ReplyNicknamed("004", daemon.hostname+" goircd o o")
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daemon.SendLusers(client)
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daemon.SendMotd(client)
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}
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}
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// Register new room in Daemon. Create an object, events sink, save pointers
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// to corresponding daemon's places and start room's processor goroutine.
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func (daemon *Daemon) RoomRegister(name string) (*Room, chan<- ClientEvent) {
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room_new := NewRoom(daemon.hostname, name, daemon.log_sink, daemon.state_sink)
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room_new.Verbose = daemon.Verbose
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room_sink := make(chan ClientEvent)
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daemon.rooms[name] = room_new
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daemon.room_sinks[room_new] = room_sink
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go room_new.Processor(room_sink)
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return room_new, room_sink
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}
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func (daemon *Daemon) HandlerJoin(client *Client, cmd string) {
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args := strings.Split(cmd, " ")
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rooms := strings.Split(args[0], ",")
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var keys []string
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if len(args) > 1 {
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keys = strings.Split(args[1], ",")
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} else {
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keys = []string{}
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}
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for n, room := range rooms {
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if !RoomNameValid(room) {
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client.ReplyNoChannel(room)
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continue
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}
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var key string
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if (n < len(keys)) && (keys[n] != "") {
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key = keys[n]
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} else {
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key = ""
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}
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denied := false
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joined := false
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for room_existing, room_sink := range daemon.room_sinks {
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if room == room_existing.name {
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if (room_existing.key != "") && (room_existing.key != key) {
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denied = true
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} else {
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room_sink <- ClientEvent{client, EVENT_NEW, ""}
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joined = true
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}
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break
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}
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}
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if denied {
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client.ReplyNicknamed("475", room, "Cannot join channel (+k) - bad key")
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}
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if denied || joined {
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continue
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}
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room_new, room_sink := daemon.RoomRegister(room)
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if key != "" {
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room_new.key = key
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room_new.StateSave()
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}
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room_sink <- ClientEvent{client, EVENT_NEW, ""}
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}
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}
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func (daemon *Daemon) Processor(events <-chan ClientEvent) {
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for event := range events {
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now := time.Now()
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client := event.client
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// Check for clients aliveness
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if daemon.last_aliveness_check.Add(ALIVENESS_CHECK).Before(now) {
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for c := range daemon.clients {
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aliveness, alive := daemon.client_aliveness[c]
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if !alive {
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continue
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}
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if aliveness.timestamp.Add(PING_TIMEOUT).Before(now) {
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log.Println(c, "ping timeout")
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c.conn.Close()
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continue
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}
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if !aliveness.ping_sent && aliveness.timestamp.Add(PING_THRESHOLD).Before(now) {
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if c.registered {
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c.Msg("PING :" + daemon.hostname)
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aliveness.ping_sent = true
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} else {
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log.Println(c, "ping timeout")
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c.conn.Close()
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}
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}
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}
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daemon.last_aliveness_check = now
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}
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switch event.event_type {
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case EVENT_NEW:
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daemon.clients[client] = true
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daemon.client_aliveness[client] = &ClientAlivenessState{ping_sent: false, timestamp: now}
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case EVENT_DEL:
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delete(daemon.clients, client)
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delete(daemon.client_aliveness, client)
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for _, room_sink := range daemon.room_sinks {
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room_sink <- event
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}
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case EVENT_MSG:
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cols := strings.SplitN(event.text, " ", 2)
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command := strings.ToUpper(cols[0])
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if daemon.Verbose {
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log.Println(client, "command", command)
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}
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if command == "QUIT" {
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delete(daemon.clients, client)
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delete(daemon.client_aliveness, client)
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client.conn.Close()
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continue
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}
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if !client.registered {
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daemon.ClientRegister(client, command, cols)
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continue
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}
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switch command {
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case "AWAY":
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continue
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case "JOIN":
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if len(cols) == 1 || len(cols[1]) < 1 {
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client.ReplyNotEnoughParameters("JOIN")
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continue
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}
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daemon.HandlerJoin(client, cols[1])
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case "LIST":
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daemon.SendList(client, cols)
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case "LUSERS":
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go daemon.SendLusers(client)
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case "MODE":
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if len(cols) == 1 || len(cols[1]) < 1 {
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client.ReplyNotEnoughParameters("MODE")
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continue
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}
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cols = strings.SplitN(cols[1], " ", 2)
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if cols[0] == client.username {
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if len(cols) == 1 {
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client.Msg("221 " + client.nickname + " +")
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} else {
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client.ReplyNicknamed("501", "Unknown MODE flag")
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}
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continue
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}
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room := cols[0]
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r, found := daemon.rooms[room]
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if !found {
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client.ReplyNoChannel(room)
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continue
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}
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if len(cols) == 1 {
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daemon.room_sinks[r] <- ClientEvent{client, EVENT_MODE, ""}
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} else {
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daemon.room_sinks[r] <- ClientEvent{client, EVENT_MODE, cols[1]}
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}
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case "MOTD":
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go daemon.SendMotd(client)
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case "PART":
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if len(cols) == 1 || len(cols[1]) < 1 {
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client.ReplyNotEnoughParameters("PART")
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continue
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}
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for _, room := range strings.Split(cols[1], ",") {
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r, found := daemon.rooms[room]
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if !found {
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client.ReplyNoChannel(room)
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continue
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}
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daemon.room_sinks[r] <- ClientEvent{client, EVENT_DEL, ""}
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}
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case "PING":
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if len(cols) == 1 {
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client.ReplyNicknamed("409", "No origin specified")
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continue
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}
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client.Reply(fmt.Sprintf("PONG %s :%s", daemon.hostname, cols[1]))
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case "PONG":
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continue
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case "NOTICE", "PRIVMSG":
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if len(cols) == 1 {
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client.ReplyNicknamed("411", "No recipient given ("+command+")")
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continue
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}
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cols = strings.SplitN(cols[1], " ", 2)
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if len(cols) == 1 {
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client.ReplyNicknamed("412", "No text to send")
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continue
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}
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msg := ""
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target := strings.ToLower(cols[0])
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for c := range daemon.clients {
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if c.nickname == target {
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msg = fmt.Sprintf(":%s %s %s %s", client, command, c.nickname, cols[1])
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c.Msg(msg)
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break
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}
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}
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if msg != "" {
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continue
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}
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r, found := daemon.rooms[target]
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if !found {
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client.ReplyNoNickChan(target)
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}
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daemon.room_sinks[r] <- ClientEvent{client, EVENT_MSG, command + " " + strings.TrimLeft(cols[1], ":")}
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case "TOPIC":
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if len(cols) == 1 {
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client.ReplyNotEnoughParameters("TOPIC")
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continue
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}
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cols = strings.SplitN(cols[1], " ", 2)
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r, found := daemon.rooms[cols[0]]
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if !found {
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client.ReplyNoChannel(cols[0])
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continue
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}
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var change string
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if len(cols) > 1 {
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change = cols[1]
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} else {
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change = ""
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}
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daemon.room_sinks[r] <- ClientEvent{client, EVENT_TOPIC, change}
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case "WHO":
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if len(cols) == 1 || len(cols[1]) < 1 {
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client.ReplyNotEnoughParameters("WHO")
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continue
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}
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room := strings.Split(cols[1], " ")[0]
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r, found := daemon.rooms[room]
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if !found {
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client.ReplyNoChannel(room)
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continue
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}
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daemon.room_sinks[r] <- ClientEvent{client, EVENT_WHO, ""}
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case "WHOIS":
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if len(cols) == 1 || len(cols[1]) < 1 {
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client.ReplyNotEnoughParameters("WHOIS")
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continue
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}
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cols := strings.Split(cols[1], " ")
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nicknames := strings.Split(cols[len(cols)-1], ",")
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go daemon.SendWhois(client, nicknames)
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default:
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client.ReplyNicknamed("421", command, "Unknown command")
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}
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}
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if aliveness, alive := daemon.client_aliveness[client]; alive {
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aliveness.timestamp = now
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aliveness.ping_sent = false
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}
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}
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}
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