355 lines
7.9 KiB
Go
355 lines
7.9 KiB
Go
package jounce
|
|
|
|
import (
|
|
"crypto/tls"
|
|
"fmt"
|
|
"io"
|
|
"net"
|
|
"strconv"
|
|
"strings"
|
|
"time"
|
|
|
|
"gopkg.in/irc.v3"
|
|
)
|
|
|
|
type upstreamChannel struct {
|
|
Name string
|
|
conn *upstreamConn
|
|
Topic string
|
|
TopicWho string
|
|
TopicTime time.Time
|
|
Status channelStatus
|
|
modes modeSet
|
|
Members map[string]membership
|
|
complete bool
|
|
}
|
|
|
|
type upstreamConn struct {
|
|
upstream *Upstream
|
|
logger Logger
|
|
net net.Conn
|
|
irc *irc.Conn
|
|
srv *Server
|
|
user *user
|
|
messages chan<- *irc.Message
|
|
ring *Ring
|
|
|
|
serverName string
|
|
availableUserModes string
|
|
availableChannelModes string
|
|
channelModesWithParam string
|
|
|
|
registered bool
|
|
nick string
|
|
closed bool
|
|
modes modeSet
|
|
channels map[string]*upstreamChannel
|
|
}
|
|
|
|
func connectToUpstream(u *user, upstream *Upstream) (*upstreamConn, error) {
|
|
logger := &prefixLogger{u.srv.Logger, fmt.Sprintf("upstream %q: ", upstream.Addr)}
|
|
logger.Printf("connecting to server")
|
|
|
|
netConn, err := tls.Dial("tcp", upstream.Addr, nil)
|
|
if err != nil {
|
|
return nil, fmt.Errorf("failed to dial %q: %v", upstream.Addr, err)
|
|
}
|
|
|
|
msgs := make(chan *irc.Message, 64)
|
|
uc := &upstreamConn{
|
|
upstream: upstream,
|
|
logger: logger,
|
|
net: netConn,
|
|
irc: irc.NewConn(netConn),
|
|
srv: u.srv,
|
|
user: u,
|
|
messages: msgs,
|
|
ring: NewRing(u.srv.RingCap),
|
|
channels: make(map[string]*upstreamChannel),
|
|
}
|
|
|
|
go func() {
|
|
for msg := range msgs {
|
|
if err := uc.irc.WriteMessage(msg); err != nil {
|
|
uc.logger.Printf("failed to write message: %v", err)
|
|
}
|
|
}
|
|
if err := uc.net.Close(); err != nil {
|
|
uc.logger.Printf("failed to close connection: %v", err)
|
|
} else {
|
|
uc.logger.Printf("connection closed")
|
|
}
|
|
}()
|
|
|
|
return uc, nil
|
|
}
|
|
|
|
func (uc *upstreamConn) Close() error {
|
|
if uc.closed {
|
|
return fmt.Errorf("upstream connection already closed")
|
|
}
|
|
close(uc.messages)
|
|
uc.closed = true
|
|
return nil
|
|
}
|
|
|
|
func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
|
|
ch, ok := uc.channels[name]
|
|
if !ok {
|
|
return nil, fmt.Errorf("unknown channel %q", name)
|
|
}
|
|
return ch, nil
|
|
}
|
|
|
|
func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
|
|
switch msg.Command {
|
|
case "PING":
|
|
// TODO: handle params
|
|
uc.messages <- &irc.Message{
|
|
Command: "PONG",
|
|
Params: []string{uc.srv.Hostname},
|
|
}
|
|
return nil
|
|
case "MODE":
|
|
var name, modeStr string
|
|
if err := parseMessageParams(msg, &name, &modeStr); err != nil {
|
|
return err
|
|
}
|
|
|
|
if name == msg.Prefix.Name { // user mode change
|
|
if name != uc.nick {
|
|
return fmt.Errorf("received MODE message for unknow nick %q", name)
|
|
}
|
|
return uc.modes.Apply(modeStr)
|
|
} else { // channel mode change
|
|
ch, err := uc.getChannel(name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if err := ch.modes.Apply(modeStr); err != nil {
|
|
return err
|
|
}
|
|
}
|
|
|
|
uc.user.forEachDownstream(func(dc *downstreamConn) {
|
|
dc.SendMessage(msg)
|
|
})
|
|
case "NOTICE":
|
|
uc.logger.Print(msg)
|
|
case irc.RPL_WELCOME:
|
|
uc.registered = true
|
|
uc.logger.Printf("connection registered")
|
|
|
|
for _, ch := range uc.upstream.Channels {
|
|
uc.messages <- &irc.Message{
|
|
Command: "JOIN",
|
|
Params: []string{ch},
|
|
}
|
|
}
|
|
case irc.RPL_MYINFO:
|
|
if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, &uc.availableChannelModes); err != nil {
|
|
return err
|
|
}
|
|
if len(msg.Params) > 5 {
|
|
uc.channelModesWithParam = msg.Params[5]
|
|
}
|
|
case "NICK":
|
|
var newNick string
|
|
if err := parseMessageParams(msg, &newNick); err != nil {
|
|
return err
|
|
}
|
|
|
|
if msg.Prefix.Name == uc.nick {
|
|
uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
|
|
uc.nick = newNick
|
|
}
|
|
|
|
for _, ch := range uc.channels {
|
|
if membership, ok := ch.Members[msg.Prefix.Name]; ok {
|
|
delete(ch.Members, msg.Prefix.Name)
|
|
ch.Members[newNick] = membership
|
|
}
|
|
}
|
|
|
|
uc.user.forEachDownstream(func(dc *downstreamConn) {
|
|
dc.SendMessage(msg)
|
|
})
|
|
case "JOIN":
|
|
var channels string
|
|
if err := parseMessageParams(msg, &channels); err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, ch := range strings.Split(channels, ",") {
|
|
if msg.Prefix.Name == uc.nick {
|
|
uc.logger.Printf("joined channel %q", ch)
|
|
uc.channels[ch] = &upstreamChannel{
|
|
Name: ch,
|
|
conn: uc,
|
|
Members: make(map[string]membership),
|
|
}
|
|
} else {
|
|
ch, err := uc.getChannel(ch)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
ch.Members[msg.Prefix.Name] = 0
|
|
}
|
|
}
|
|
|
|
uc.user.forEachDownstream(func(dc *downstreamConn) {
|
|
dc.SendMessage(msg)
|
|
})
|
|
case "PART":
|
|
var channels string
|
|
if err := parseMessageParams(msg, &channels); err != nil {
|
|
return err
|
|
}
|
|
|
|
for _, ch := range strings.Split(channels, ",") {
|
|
if msg.Prefix.Name == uc.nick {
|
|
uc.logger.Printf("parted channel %q", ch)
|
|
delete(uc.channels, ch)
|
|
} else {
|
|
ch, err := uc.getChannel(ch)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
delete(ch.Members, msg.Prefix.Name)
|
|
}
|
|
}
|
|
|
|
uc.user.forEachDownstream(func(dc *downstreamConn) {
|
|
dc.SendMessage(msg)
|
|
})
|
|
case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
|
|
var name, topic string
|
|
if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
|
|
return err
|
|
}
|
|
ch, err := uc.getChannel(name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if msg.Command == irc.RPL_TOPIC {
|
|
ch.Topic = topic
|
|
} else {
|
|
ch.Topic = ""
|
|
}
|
|
case "TOPIC":
|
|
var name string
|
|
if err := parseMessageParams(msg, nil, &name); err != nil {
|
|
return err
|
|
}
|
|
ch, err := uc.getChannel(name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if len(msg.Params) > 1 {
|
|
ch.Topic = msg.Params[1]
|
|
} else {
|
|
ch.Topic = ""
|
|
}
|
|
case rpl_topicwhotime:
|
|
var name, who, timeStr string
|
|
if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
|
|
return err
|
|
}
|
|
ch, err := uc.getChannel(name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
ch.TopicWho = who
|
|
sec, err := strconv.ParseInt(timeStr, 10, 64)
|
|
if err != nil {
|
|
return fmt.Errorf("failed to parse topic time: %v", err)
|
|
}
|
|
ch.TopicTime = time.Unix(sec, 0)
|
|
case irc.RPL_NAMREPLY:
|
|
var name, statusStr, members string
|
|
if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
|
|
return err
|
|
}
|
|
ch, err := uc.getChannel(name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
status, err := parseChannelStatus(statusStr)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
ch.Status = status
|
|
|
|
for _, s := range strings.Split(members, " ") {
|
|
membership, nick := parseMembershipPrefix(s)
|
|
ch.Members[nick] = membership
|
|
}
|
|
case irc.RPL_ENDOFNAMES:
|
|
var name string
|
|
if err := parseMessageParams(msg, nil, &name); err != nil {
|
|
return err
|
|
}
|
|
ch, err := uc.getChannel(name)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
|
|
if ch.complete {
|
|
return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
|
|
}
|
|
ch.complete = true
|
|
|
|
uc.user.forEachDownstream(func(dc *downstreamConn) {
|
|
forwardChannel(dc, ch)
|
|
})
|
|
case "PRIVMSG":
|
|
uc.ring.Produce(msg)
|
|
uc.user.forEachDownstream(func(dc *downstreamConn) {
|
|
dc.SendMessage(msg)
|
|
})
|
|
case irc.RPL_YOURHOST, irc.RPL_CREATED:
|
|
// Ignore
|
|
case irc.RPL_LUSERCLIENT, irc.RPL_LUSEROP, irc.RPL_LUSERUNKNOWN, irc.RPL_LUSERCHANNELS, irc.RPL_LUSERME:
|
|
// Ignore
|
|
case irc.RPL_MOTDSTART, irc.RPL_MOTD, irc.RPL_ENDOFMOTD:
|
|
// Ignore
|
|
case rpl_localusers, rpl_globalusers:
|
|
// Ignore
|
|
case irc.RPL_STATSVLINE, irc.RPL_STATSPING, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
|
|
// Ignore
|
|
default:
|
|
uc.logger.Printf("unhandled upstream message: %v", msg)
|
|
}
|
|
return nil
|
|
}
|
|
|
|
func (uc *upstreamConn) register() {
|
|
uc.nick = uc.upstream.Nick
|
|
uc.messages <- &irc.Message{
|
|
Command: "NICK",
|
|
Params: []string{uc.upstream.Nick},
|
|
}
|
|
uc.messages <- &irc.Message{
|
|
Command: "USER",
|
|
Params: []string{uc.upstream.Username, "0", "*", uc.upstream.Realname},
|
|
}
|
|
}
|
|
|
|
func (uc *upstreamConn) readMessages() error {
|
|
for {
|
|
msg, err := uc.irc.ReadMessage()
|
|
if err == io.EOF {
|
|
break
|
|
} else if err != nil {
|
|
return fmt.Errorf("failed to read IRC command: %v", err)
|
|
}
|
|
|
|
if err := uc.handleMessage(msg); err != nil {
|
|
uc.logger.Printf("failed to handle message %q: %v", msg, err)
|
|
}
|
|
}
|
|
|
|
return nil
|
|
}
|