soju/upstream.go

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2020-03-13 17:13:03 +00:00
package soju
import (
"crypto/tls"
"encoding/base64"
"errors"
"fmt"
"io"
"net"
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"strconv"
"strings"
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"time"
"github.com/emersion/go-sasl"
"gopkg.in/irc.v3"
)
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type upstreamChannel struct {
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Name string
conn *upstreamConn
Topic string
TopicWho string
TopicTime time.Time
Status channelStatus
modes channelModes
creationTime string
Members map[string]*membership
complete bool
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}
type upstreamConn struct {
network *network
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logger Logger
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net net.Conn
irc *irc.Conn
srv *Server
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user *user
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outgoing chan<- *irc.Message
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serverName string
availableUserModes string
availableChannelModes map[byte]channelModeType
availableChannelTypes string
availableMemberships []membership
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registered bool
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nick string
username string
realname string
closed bool
modes userModes
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channels map[string]*upstreamChannel
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caps map[string]string
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batches map[string]batch
tagsSupported bool
labelsSupported bool
nextLabelID uint64
saslClient sasl.Client
saslStarted bool
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}
func connectToUpstream(network *network) (*upstreamConn, error) {
logger := &prefixLogger{network.user.srv.Logger, fmt.Sprintf("upstream %q: ", network.Addr)}
addr := network.Addr
if !strings.ContainsRune(addr, ':') {
addr = addr + ":6697"
}
logger.Printf("connecting to TLS server at address %q", addr)
netConn, err := tls.Dial("tcp", addr, nil)
if err != nil {
return nil, fmt.Errorf("failed to dial %q: %v", addr, err)
}
setKeepAlive(netConn)
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outgoing := make(chan *irc.Message, 64)
uc := &upstreamConn{
network: network,
logger: logger,
net: netConn,
irc: irc.NewConn(netConn),
srv: network.user.srv,
user: network.user,
outgoing: outgoing,
channels: make(map[string]*upstreamChannel),
caps: make(map[string]string),
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batches: make(map[string]batch),
availableChannelTypes: stdChannelTypes,
availableChannelModes: stdChannelModes,
availableMemberships: stdMemberships,
}
go func() {
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for msg := range outgoing {
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if uc.srv.Debug {
uc.logger.Printf("sent: %v", msg)
}
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")
}
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close(uc.outgoing)
uc.closed = true
return nil
}
func (uc *upstreamConn) forEachDownstream(f func(*downstreamConn)) {
uc.user.forEachDownstream(func(dc *downstreamConn) {
if dc.network != nil && dc.network != uc.network {
return
}
f(dc)
})
}
func (uc *upstreamConn) forEachDownstreamByID(id uint64, f func(*downstreamConn)) {
uc.forEachDownstream(func(dc *downstreamConn) {
if id != 0 && id != dc.id {
return
}
f(dc)
})
}
func (uc *upstreamConn) getChannel(name string) (*upstreamChannel, error) {
ch, ok := uc.channels[name]
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if !ok {
return nil, fmt.Errorf("unknown channel %q", name)
}
return ch, nil
}
func (uc *upstreamConn) isChannel(entity string) bool {
if i := strings.IndexByte(uc.availableChannelTypes, entity[0]); i >= 0 {
return true
}
return false
}
func (uc *upstreamConn) parseMembershipPrefix(s string) (membership *membership, nick string) {
for _, m := range uc.availableMemberships {
if m.Prefix == s[0] {
return &m, s[1:]
}
}
return nil, s
}
func (uc *upstreamConn) handleMessage(msg *irc.Message) error {
var label string
if l, ok := msg.GetTag("label"); ok {
label = l
}
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var msgBatch *batch
if batchName, ok := msg.GetTag("batch"); ok {
b, ok := uc.batches[batchName]
if !ok {
return fmt.Errorf("unexpected batch reference: batch was not defined: %q", batchName)
}
msgBatch = &b
if label == "" {
label = msgBatch.Label
}
}
var downstreamID uint64 = 0
if label != "" {
var labelOffset uint64
n, err := fmt.Sscanf(label, "sd-%d-%d", &downstreamID, &labelOffset)
if err == nil && n < 2 {
err = errors.New("not enough arguments")
}
if err != nil {
return fmt.Errorf("unexpected message label: invalid downstream reference for label %q: %v", label, err)
}
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}
switch msg.Command {
case "PING":
uc.SendMessage(&irc.Message{
Command: "PONG",
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Params: msg.Params,
})
return nil
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case "NOTICE":
uc.logger.Print(msg)
if msg.Prefix.User == "" && msg.Prefix.Host == "" { // server message
uc.forEachDownstream(func(dc *downstreamConn) {
dc.SendMessage(msg)
})
} else { // regular user NOTICE
var nick, text string
if err := parseMessageParams(msg, &nick, &text); err != nil {
return err
}
uc.forEachDownstream(func(dc *downstreamConn) {
dc.SendMessage(&irc.Message{
Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
Command: "NOTICE",
Params: []string{dc.marshalEntity(uc, nick), text},
})
})
}
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case "CAP":
var subCmd string
if err := parseMessageParams(msg, nil, &subCmd); err != nil {
return err
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}
subCmd = strings.ToUpper(subCmd)
subParams := msg.Params[2:]
switch subCmd {
case "LS":
if len(subParams) < 1 {
return newNeedMoreParamsError(msg.Command)
}
caps := strings.Fields(subParams[len(subParams)-1])
more := len(subParams) >= 2 && msg.Params[len(subParams)-2] == "*"
for _, s := range caps {
kv := strings.SplitN(s, "=", 2)
k := strings.ToLower(kv[0])
var v string
if len(kv) == 2 {
v = kv[1]
}
uc.caps[k] = v
}
if more {
break // wait to receive all capabilities
}
requestCaps := make([]string, 0, 16)
for _, c := range []string{"message-tags", "batch", "labeled-response"} {
if _, ok := uc.caps[c]; ok {
requestCaps = append(requestCaps, c)
}
}
if uc.requestSASL() {
requestCaps = append(requestCaps, "sasl")
}
if len(requestCaps) > 0 {
uc.SendMessage(&irc.Message{
Command: "CAP",
Params: []string{"REQ", strings.Join(requestCaps, " ")},
})
}
if uc.requestSASL() {
break // we'll send CAP END after authentication is completed
}
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uc.SendMessage(&irc.Message{
Command: "CAP",
Params: []string{"END"},
})
case "ACK", "NAK":
if len(subParams) < 1 {
return newNeedMoreParamsError(msg.Command)
}
caps := strings.Fields(subParams[0])
for _, name := range caps {
if err := uc.handleCapAck(strings.ToLower(name), subCmd == "ACK"); err != nil {
return err
}
}
if uc.saslClient == nil {
uc.SendMessage(&irc.Message{
Command: "CAP",
Params: []string{"END"},
})
}
default:
uc.logger.Printf("unhandled message: %v", msg)
}
case "AUTHENTICATE":
if uc.saslClient == nil {
return fmt.Errorf("received unexpected AUTHENTICATE message")
}
// TODO: if a challenge is 400 bytes long, buffer it
var challengeStr string
if err := parseMessageParams(msg, &challengeStr); err != nil {
uc.SendMessage(&irc.Message{
Command: "AUTHENTICATE",
Params: []string{"*"},
})
return err
}
var challenge []byte
if challengeStr != "+" {
var err error
challenge, err = base64.StdEncoding.DecodeString(challengeStr)
if err != nil {
uc.SendMessage(&irc.Message{
Command: "AUTHENTICATE",
Params: []string{"*"},
})
return err
}
}
var resp []byte
var err error
if !uc.saslStarted {
_, resp, err = uc.saslClient.Start()
uc.saslStarted = true
} else {
resp, err = uc.saslClient.Next(challenge)
}
if err != nil {
uc.SendMessage(&irc.Message{
Command: "AUTHENTICATE",
Params: []string{"*"},
})
return err
}
// TODO: send response in multiple chunks if >= 400 bytes
var respStr = "+"
if resp != nil {
respStr = base64.StdEncoding.EncodeToString(resp)
}
uc.SendMessage(&irc.Message{
Command: "AUTHENTICATE",
Params: []string{respStr},
})
case irc.RPL_LOGGEDIN:
var account string
if err := parseMessageParams(msg, nil, nil, &account); err != nil {
return err
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}
uc.logger.Printf("logged in with account %q", account)
case irc.RPL_LOGGEDOUT:
uc.logger.Printf("logged out")
case irc.ERR_NICKLOCKED, irc.RPL_SASLSUCCESS, irc.ERR_SASLFAIL, irc.ERR_SASLTOOLONG, irc.ERR_SASLABORTED:
var info string
if err := parseMessageParams(msg, nil, &info); err != nil {
return err
}
switch msg.Command {
case irc.ERR_NICKLOCKED:
uc.logger.Printf("invalid nick used with SASL authentication: %v", info)
case irc.ERR_SASLFAIL:
uc.logger.Printf("SASL authentication failed: %v", info)
case irc.ERR_SASLTOOLONG:
uc.logger.Printf("SASL message too long: %v", info)
}
uc.saslClient = nil
uc.saslStarted = false
uc.SendMessage(&irc.Message{
Command: "CAP",
Params: []string{"END"},
})
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case irc.RPL_WELCOME:
uc.registered = true
uc.logger.Printf("connection registered")
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channels, err := uc.srv.db.ListChannels(uc.network.ID)
if err != nil {
uc.logger.Printf("failed to list channels from database: %v", err)
break
}
for _, ch := range channels {
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params := []string{ch.Name}
if ch.Key != "" {
params = append(params, ch.Key)
}
uc.SendMessage(&irc.Message{
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Command: "JOIN",
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Params: params,
})
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}
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case irc.RPL_MYINFO:
if err := parseMessageParams(msg, nil, &uc.serverName, nil, &uc.availableUserModes, nil); err != nil {
return err
}
case irc.RPL_ISUPPORT:
if err := parseMessageParams(msg, nil, nil); err != nil {
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return err
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}
for _, token := range msg.Params[1 : len(msg.Params)-1] {
negate := false
parameter := token
value := ""
if strings.HasPrefix(token, "-") {
negate = true
token = token[1:]
} else {
if i := strings.IndexByte(token, '='); i >= 0 {
parameter = token[:i]
value = token[i+1:]
}
}
if !negate {
switch parameter {
case "CHANMODES":
parts := strings.SplitN(value, ",", 5)
if len(parts) < 4 {
return fmt.Errorf("malformed ISUPPORT CHANMODES value: %v", value)
}
modes := make(map[byte]channelModeType)
for i, mt := range []channelModeType{modeTypeA, modeTypeB, modeTypeC, modeTypeD} {
for j := 0; j < len(parts[i]); j++ {
mode := parts[i][j]
modes[mode] = mt
}
}
uc.availableChannelModes = modes
case "CHANTYPES":
uc.availableChannelTypes = value
case "PREFIX":
if value == "" {
uc.availableMemberships = nil
} else {
if value[0] != '(' {
return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
}
sep := strings.IndexByte(value, ')')
if sep < 0 || len(value) != sep*2 {
return fmt.Errorf("malformed ISUPPORT PREFIX value: %v", value)
}
memberships := make([]membership, len(value)/2-1)
for i := range memberships {
memberships[i] = membership{
Mode: value[i+1],
Prefix: value[sep+i+1],
}
}
uc.availableMemberships = memberships
}
}
} else {
// TODO: handle ISUPPORT negations
}
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}
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case "BATCH":
var tag string
if err := parseMessageParams(msg, &tag); err != nil {
return err
}
if strings.HasPrefix(tag, "+") {
tag = tag[1:]
if _, ok := uc.batches[tag]; ok {
return fmt.Errorf("unexpected BATCH reference tag: batch was already defined: %q", tag)
}
var batchType string
if err := parseMessageParams(msg, nil, &batchType); err != nil {
return err
}
label := label
if label == "" && msgBatch != nil {
label = msgBatch.Label
}
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uc.batches[tag] = batch{
Type: batchType,
Params: msg.Params[2:],
Outer: msgBatch,
Label: label,
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}
} else if strings.HasPrefix(tag, "-") {
tag = tag[1:]
if _, ok := uc.batches[tag]; !ok {
return fmt.Errorf("unknown BATCH reference tag: %q", tag)
}
delete(uc.batches, tag)
} else {
return fmt.Errorf("unexpected BATCH reference tag: missing +/- prefix: %q", tag)
}
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case "NICK":
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if msg.Prefix == nil {
return fmt.Errorf("expected a prefix")
}
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var newNick string
if err := parseMessageParams(msg, &newNick); err != nil {
return err
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}
if msg.Prefix.Name == uc.nick {
uc.logger.Printf("changed nick from %q to %q", uc.nick, newNick)
uc.nick = newNick
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}
for _, ch := range uc.channels {
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if membership, ok := ch.Members[msg.Prefix.Name]; ok {
delete(ch.Members, msg.Prefix.Name)
ch.Members[newNick] = membership
}
}
if msg.Prefix.Name != uc.nick {
uc.forEachDownstream(func(dc *downstreamConn) {
dc.SendMessage(&irc.Message{
Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
Command: "NICK",
Params: []string{newNick},
})
})
}
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case "JOIN":
if msg.Prefix == nil {
return fmt.Errorf("expected a prefix")
}
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var channels string
if err := parseMessageParams(msg, &channels); err != nil {
return err
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}
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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),
}
uc.SendMessage(&irc.Message{
Command: "MODE",
Params: []string{ch},
})
} else {
ch, err := uc.getChannel(ch)
if err != nil {
return err
}
ch.Members[msg.Prefix.Name] = nil
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}
uc.forEachDownstream(func(dc *downstreamConn) {
dc.SendMessage(&irc.Message{
Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
Command: "JOIN",
Params: []string{dc.marshalChannel(uc, ch)},
})
})
}
case "PART":
if msg.Prefix == nil {
return fmt.Errorf("expected a prefix")
}
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var channels string
if err := parseMessageParams(msg, &channels); err != nil {
return err
}
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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.forEachDownstream(func(dc *downstreamConn) {
dc.SendMessage(&irc.Message{
Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
Command: "PART",
Params: []string{dc.marshalChannel(uc, ch)},
})
})
}
case "KICK":
if msg.Prefix == nil {
return fmt.Errorf("expected a prefix")
}
var channel, user string
if err := parseMessageParams(msg, &channel, &user); err != nil {
return err
}
var reason string
if len(msg.Params) > 2 {
reason = msg.Params[1]
}
if user == uc.nick {
uc.logger.Printf("kicked from channel %q by %s", channel, msg.Prefix.Name)
delete(uc.channels, channel)
} else {
ch, err := uc.getChannel(channel)
if err != nil {
return err
}
delete(ch.Members, user)
}
uc.forEachDownstream(func(dc *downstreamConn) {
params := []string{dc.marshalChannel(uc, channel), dc.marshalNick(uc, user)}
if reason != "" {
params = append(params, reason)
}
dc.SendMessage(&irc.Message{
Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
Command: "KICK",
Params: params,
})
})
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case "QUIT":
if msg.Prefix == nil {
return fmt.Errorf("expected a prefix")
}
if msg.Prefix.Name == uc.nick {
uc.logger.Printf("quit")
}
for _, ch := range uc.channels {
delete(ch.Members, msg.Prefix.Name)
}
if msg.Prefix.Name != uc.nick {
uc.forEachDownstream(func(dc *downstreamConn) {
dc.SendMessage(&irc.Message{
Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
Command: "QUIT",
Params: msg.Params,
})
})
}
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case irc.RPL_TOPIC, irc.RPL_NOTOPIC:
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var name, topic string
if err := parseMessageParams(msg, nil, &name, &topic); err != nil {
return err
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}
ch, err := uc.getChannel(name)
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if err != nil {
return err
}
if msg.Command == irc.RPL_TOPIC {
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ch.Topic = topic
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} else {
ch.Topic = ""
}
case "TOPIC":
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var name string
if err := parseMessageParams(msg, &name); err != nil {
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return err
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}
ch, err := uc.getChannel(name)
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if err != nil {
return err
}
if len(msg.Params) > 1 {
ch.Topic = msg.Params[1]
} else {
ch.Topic = ""
}
uc.forEachDownstream(func(dc *downstreamConn) {
params := []string{dc.marshalChannel(uc, name)}
if ch.Topic != "" {
params = append(params, ch.Topic)
}
dc.SendMessage(&irc.Message{
Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
Command: "TOPIC",
Params: params,
})
})
case "MODE":
var name, modeStr string
if err := parseMessageParams(msg, &name, &modeStr); err != nil {
return err
}
if !uc.isChannel(name) { // user mode change
if name != uc.nick {
return fmt.Errorf("received MODE message for unknown nick %q", name)
}
return uc.modes.Apply(modeStr)
// TODO: notify downstreams about user mode change?
} else { // channel mode change
ch, err := uc.getChannel(name)
if err != nil {
return err
}
if ch.modes != nil {
if err := ch.modes.Apply(uc.availableChannelModes, modeStr, msg.Params[2:]...); err != nil {
return err
}
}
uc.forEachDownstream(func(dc *downstreamConn) {
params := []string{dc.marshalChannel(uc, name), modeStr}
params = append(params, msg.Params[2:]...)
dc.SendMessage(&irc.Message{
Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
Command: "MODE",
Params: params,
})
})
}
case irc.RPL_UMODEIS:
if err := parseMessageParams(msg, nil); err != nil {
return err
}
modeStr := ""
if len(msg.Params) > 1 {
modeStr = msg.Params[1]
}
uc.modes = ""
if err := uc.modes.Apply(modeStr); err != nil {
return err
}
// TODO: send RPL_UMODEIS to downstream connections when applicable
case irc.RPL_CHANNELMODEIS:
var channel string
if err := parseMessageParams(msg, nil, &channel); err != nil {
return err
}
modeStr := ""
if len(msg.Params) > 2 {
modeStr = msg.Params[2]
}
ch, err := uc.getChannel(channel)
if err != nil {
return err
}
firstMode := ch.modes == nil
ch.modes = make(map[byte]string)
if err := ch.modes.Apply(uc.availableChannelModes, modeStr, msg.Params[3:]...); err != nil {
return err
}
if firstMode {
modeStr, modeParams := ch.modes.Format()
uc.forEachDownstream(func(dc *downstreamConn) {
params := []string{dc.nick, dc.marshalChannel(uc, channel), modeStr}
params = append(params, modeParams...)
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_CHANNELMODEIS,
Params: params,
})
})
}
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case rpl_creationtime:
var channel, creationTime string
if err := parseMessageParams(msg, nil, &channel, &creationTime); err != nil {
return err
}
ch, err := uc.getChannel(channel)
if err != nil {
return err
}
firstCreationTime := ch.creationTime == ""
ch.creationTime = creationTime
if firstCreationTime {
uc.forEachDownstream(func(dc *downstreamConn) {
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: rpl_creationtime,
Params: []string{dc.nick, channel, creationTime},
})
})
}
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case rpl_topicwhotime:
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var name, who, timeStr string
if err := parseMessageParams(msg, nil, &name, &who, &timeStr); err != nil {
return err
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}
ch, err := uc.getChannel(name)
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if err != nil {
return err
}
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ch.TopicWho = who
sec, err := strconv.ParseInt(timeStr, 10, 64)
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if err != nil {
return fmt.Errorf("failed to parse topic time: %v", err)
}
ch.TopicTime = time.Unix(sec, 0)
case irc.RPL_NAMREPLY:
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var name, statusStr, members string
if err := parseMessageParams(msg, nil, &statusStr, &name, &members); err != nil {
return err
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}
members = strings.TrimRight(members, " ")
ch, ok := uc.channels[name]
if !ok {
// NAMES on a channel we have not joined, forward to downstream
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
channel := dc.marshalChannel(uc, name)
members := strings.Split(members, " ")
for i, member := range members {
membership, nick := uc.parseMembershipPrefix(member)
members[i] = membership.String() + dc.marshalNick(uc, nick)
}
memberStr := strings.Join(members, " ")
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_NAMREPLY,
Params: []string{dc.nick, statusStr, channel, memberStr},
})
})
return nil
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}
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status, err := parseChannelStatus(statusStr)
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if err != nil {
return err
}
ch.Status = status
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for _, s := range strings.Split(members, " ") {
membership, nick := uc.parseMembershipPrefix(s)
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ch.Members[nick] = membership
}
case irc.RPL_ENDOFNAMES:
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var name string
if err := parseMessageParams(msg, nil, &name); err != nil {
return err
}
ch, ok := uc.channels[name]
if !ok {
// NAMES on a channel we have not joined, forward to downstream
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
channel := dc.marshalChannel(uc, name)
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_ENDOFNAMES,
Params: []string{dc.nick, channel, "End of /NAMES list"},
})
})
return nil
}
if ch.complete {
return fmt.Errorf("received unexpected RPL_ENDOFNAMES")
}
ch.complete = true
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uc.forEachDownstream(func(dc *downstreamConn) {
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forwardChannel(dc, ch)
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})
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case irc.RPL_WHOREPLY:
var channel, username, host, server, nick, mode, trailing string
if err := parseMessageParams(msg, nil, &channel, &username, &host, &server, &nick, &mode, &trailing); err != nil {
return err
}
parts := strings.SplitN(trailing, " ", 2)
if len(parts) != 2 {
return fmt.Errorf("received malformed RPL_WHOREPLY: wrong trailing parameter: %s", trailing)
}
realname := parts[1]
hops, err := strconv.Atoi(parts[0])
if err != nil {
return fmt.Errorf("received malformed RPL_WHOREPLY: wrong hop count: %s", parts[0])
}
hops++
trailing = strconv.Itoa(hops) + " " + realname
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
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channel := channel
if channel != "*" {
channel = dc.marshalChannel(uc, channel)
}
nick := dc.marshalNick(uc, nick)
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_WHOREPLY,
Params: []string{dc.nick, channel, username, host, server, nick, mode, trailing},
})
})
case irc.RPL_ENDOFWHO:
var name string
if err := parseMessageParams(msg, nil, &name); err != nil {
return err
}
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
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name := name
if name != "*" {
// TODO: support WHO masks
name = dc.marshalEntity(uc, name)
}
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_ENDOFWHO,
Params: []string{dc.nick, name, "End of /WHO list"},
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})
})
case irc.RPL_WHOISUSER:
var nick, username, host, realname string
if err := parseMessageParams(msg, nil, &nick, &username, &host, nil, &realname); err != nil {
return err
}
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
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nick := dc.marshalNick(uc, nick)
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_WHOISUSER,
Params: []string{dc.nick, nick, username, host, "*", realname},
})
})
case irc.RPL_WHOISSERVER:
var nick, server, serverInfo string
if err := parseMessageParams(msg, nil, &nick, &server, &serverInfo); err != nil {
return err
}
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
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nick := dc.marshalNick(uc, nick)
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_WHOISSERVER,
Params: []string{dc.nick, nick, server, serverInfo},
})
})
case irc.RPL_WHOISOPERATOR:
var nick string
if err := parseMessageParams(msg, nil, &nick); err != nil {
return err
}
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
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nick := dc.marshalNick(uc, nick)
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_WHOISOPERATOR,
Params: []string{dc.nick, nick, "is an IRC operator"},
})
})
case irc.RPL_WHOISIDLE:
var nick string
if err := parseMessageParams(msg, nil, &nick, nil); err != nil {
return err
}
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
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nick := dc.marshalNick(uc, nick)
params := []string{dc.nick, nick}
params = append(params, msg.Params[2:]...)
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_WHOISIDLE,
Params: params,
})
})
case irc.RPL_WHOISCHANNELS:
var nick, channelList string
if err := parseMessageParams(msg, nil, &nick, &channelList); err != nil {
return err
}
channels := strings.Split(channelList, " ")
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
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nick := dc.marshalNick(uc, nick)
channelList := make([]string, len(channels))
for i, channel := range channels {
prefix, channel := uc.parseMembershipPrefix(channel)
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channel = dc.marshalChannel(uc, channel)
channelList[i] = prefix.String() + channel
}
channels := strings.Join(channelList, " ")
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_WHOISCHANNELS,
Params: []string{dc.nick, nick, channels},
})
})
case irc.RPL_ENDOFWHOIS:
var nick string
if err := parseMessageParams(msg, nil, &nick); err != nil {
return err
}
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
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nick := dc.marshalNick(uc, nick)
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_ENDOFWHOIS,
Params: []string{dc.nick, nick, "End of /WHOIS list"},
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})
})
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case "PRIVMSG":
if msg.Prefix == nil {
return fmt.Errorf("expected a prefix")
}
var nick string
if err := parseMessageParams(msg, &nick, nil); err != nil {
return err
}
if msg.Prefix.Name == serviceNick {
uc.logger.Printf("skipping PRIVMSG from soju's service: %v", msg)
break
}
if nick == serviceNick {
uc.logger.Printf("skipping PRIVMSG to soju's service: %v", msg)
break
}
uc.network.ring.Produce(msg)
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case "INVITE":
var nick string
var channel string
if err := parseMessageParams(msg, &nick, &channel); err != nil {
return err
}
uc.forEachDownstream(func(dc *downstreamConn) {
dc.SendMessage(&irc.Message{
Prefix: dc.marshalUserPrefix(uc, msg.Prefix),
Command: "INVITE",
Params: []string{dc.marshalNick(uc, nick), dc.marshalChannel(uc, channel)},
})
})
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case irc.RPL_INVITING:
var nick string
var channel string
if err := parseMessageParams(msg, &nick, &channel); err != nil {
return err
}
uc.forEachDownstreamByID(downstreamID, func(dc *downstreamConn) {
dc.SendMessage(&irc.Message{
Prefix: dc.srv.prefix(),
Command: irc.RPL_INVITING,
Params: []string{dc.nick, dc.marshalNick(uc, nick), dc.marshalChannel(uc, channel)},
})
})
case "TAGMSG":
// TODO: relay to downstream connections that accept message-tags
case "ACK":
// Ignore
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case irc.RPL_YOURHOST, irc.RPL_CREATED:
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// 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, rpl_statsping, irc.RPL_STATSBLINE, irc.RPL_STATSDLINE:
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// Ignore
default:
uc.logger.Printf("unhandled message: %v", msg)
}
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return nil
}
func (uc *upstreamConn) register() {
uc.nick = uc.network.Nick
uc.username = uc.network.Username
if uc.username == "" {
uc.username = uc.nick
}
uc.realname = uc.network.Realname
if uc.realname == "" {
uc.realname = uc.nick
}
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uc.SendMessage(&irc.Message{
Command: "CAP",
Params: []string{"LS", "302"},
})
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if uc.network.Pass != "" {
uc.SendMessage(&irc.Message{
Command: "PASS",
Params: []string{uc.network.Pass},
})
}
uc.SendMessage(&irc.Message{
Command: "NICK",
Params: []string{uc.nick},
})
uc.SendMessage(&irc.Message{
Command: "USER",
Params: []string{uc.username, "0", "*", uc.realname},
})
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}
func (uc *upstreamConn) requestSASL() bool {
if uc.network.SASL.Mechanism == "" {
return false
}
v, ok := uc.caps["sasl"]
if !ok {
return false
}
if v != "" {
mechanisms := strings.Split(v, ",")
found := false
for _, mech := range mechanisms {
if strings.EqualFold(mech, uc.network.SASL.Mechanism) {
found = true
break
}
}
if !found {
return false
}
}
return true
}
func (uc *upstreamConn) handleCapAck(name string, ok bool) error {
auth := &uc.network.SASL
switch name {
case "sasl":
if !ok {
uc.logger.Printf("server refused to acknowledge the SASL capability")
return nil
}
switch auth.Mechanism {
case "PLAIN":
uc.logger.Printf("starting SASL PLAIN authentication with username %q", auth.Plain.Username)
uc.saslClient = sasl.NewPlainClient("", auth.Plain.Username, auth.Plain.Password)
default:
return fmt.Errorf("unsupported SASL mechanism %q", name)
}
uc.SendMessage(&irc.Message{
Command: "AUTHENTICATE",
Params: []string{auth.Mechanism},
})
case "message-tags":
uc.tagsSupported = ok
case "labeled-response":
uc.labelsSupported = ok
}
return nil
}
func (uc *upstreamConn) readMessages(ch chan<- event) 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)
}
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if uc.srv.Debug {
uc.logger.Printf("received: %v", msg)
}
ch <- eventUpstreamMessage{msg, uc}
}
return nil
}
func (uc *upstreamConn) SendMessage(msg *irc.Message) {
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uc.outgoing <- msg
}
func (uc *upstreamConn) SendMessageLabeled(dc *downstreamConn, msg *irc.Message) {
if uc.labelsSupported {
if msg.Tags == nil {
msg.Tags = make(map[string]irc.TagValue)
}
msg.Tags["label"] = irc.TagValue(fmt.Sprintf("sd-%d-%d", dc.id, uc.nextLabelID))
uc.nextLabelID++
}
uc.SendMessage(msg)
}