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2c231853b5
ergo/irc/handlers.go
Shivaram Lingamneni 3dc5c8de78 more work on websocket support
2020-05-04 23:26:51 -04:00

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// Copyright (c) 2012-2014 Jeremy Latt
// Copyright (c) 2014-2015 Edmund Huber
// Copyright (c) 2016-2018 Daniel Oaks <daniel@danieloaks.net>
// Copyright (c) 2017-2018 Shivaram Lingamneni <slingamn@cs.stanford.edu>
// released under the MIT license
package irc
import (
"bytes"
"encoding/base64"
"fmt"
"net"
"os"
"runtime"
"runtime/debug"
"runtime/pprof"
"sort"
"strconv"
"strings"
"time"
"github.com/goshuirc/irc-go/ircfmt"
"github.com/goshuirc/irc-go/ircmatch"
"github.com/goshuirc/irc-go/ircmsg"
"github.com/oragono/oragono/irc/caps"
"github.com/oragono/oragono/irc/custime"
"github.com/oragono/oragono/irc/history"
"github.com/oragono/oragono/irc/modes"
"github.com/oragono/oragono/irc/sno"
"github.com/oragono/oragono/irc/utils"
"golang.org/x/crypto/bcrypt"
)
// helper function to parse ACC callbacks, e.g., mailto:person@example.com, tel:16505551234
func parseCallback(spec string, config AccountConfig) (callbackNamespace string, callbackValue string) {
callback := strings.ToLower(spec)
if callback == "*" {
callbackNamespace = "*"
} else if strings.Contains(callback, ":") {
callbackValues := strings.SplitN(callback, ":", 2)
callbackNamespace, callbackValue = callbackValues[0], callbackValues[1]
} else {
// "If a callback namespace is not ... provided, the IRC server MUST use mailto""
callbackNamespace = "mailto"
callbackValue = callback
}
// ensure the callback namespace is valid
// need to search callback list, maybe look at using a map later?
for _, name := range config.Registration.EnabledCallbacks {
if callbackNamespace == name {
return
}
}
// error value
callbackNamespace = ""
return
}
func registrationErrorToMessageAndCode(err error) (message, code string) {
// default responses: let's be risk-averse about displaying internal errors
// to the clients, especially for something as sensitive as accounts
code = "REG_UNSPECIFIED_ERROR"
message = `Could not register`
switch err {
case errAccountBadPassphrase:
code = "REG_INVALID_CREDENTIAL"
message = err.Error()
case errAccountAlreadyRegistered, errAccountAlreadyVerified, errAccountAlreadyUnregistered, errAccountAlreadyLoggedIn, errAccountCreation, errAccountMustHoldNick, errAccountBadPassphrase, errCertfpAlreadyExists, errFeatureDisabled:
message = err.Error()
case errLimitExceeded:
message = `There have been too many registration attempts recently; try again later`
}
return
}
// helper function to dispatch messages when a client successfully registers
func sendSuccessfulRegResponse(client *Client, rb *ResponseBuffer, forNS bool) {
details := client.Details()
if forNS {
nsNotice(rb, client.t("Account created"))
} else {
rb.Add(nil, client.server.name, RPL_REG_SUCCESS, details.nick, details.accountName, client.t("Account created"))
}
client.server.snomasks.Send(sno.LocalAccounts, fmt.Sprintf(ircfmt.Unescape("Client $c[grey][$r%s$c[grey]] registered account $c[grey][$r%s$c[grey]]"), details.nickMask, details.accountName))
sendSuccessfulAccountAuth(client, rb, forNS, false)
}
// sendSuccessfulAccountAuth means that an account auth attempt completed successfully, and is used to dispatch messages.
func sendSuccessfulAccountAuth(client *Client, rb *ResponseBuffer, forNS, forSASL bool) {
details := client.Details()
if forNS {
nsNotice(rb, fmt.Sprintf(client.t("You're now logged in as %s"), details.accountName))
} else {
//TODO(dan): some servers send this numeric even for NickServ logins iirc? to confirm and maybe do too
rb.Add(nil, client.server.name, RPL_LOGGEDIN, details.nick, details.nickMask, details.accountName, fmt.Sprintf(client.t("You are now logged in as %s"), details.accountName))
if forSASL {
rb.Add(nil, client.server.name, RPL_SASLSUCCESS, details.nick, client.t("Authentication successful"))
}
}
// dispatch account-notify
for friend := range client.Friends(caps.AccountNotify) {
friend.Send(nil, details.nickMask, "ACCOUNT", details.accountName)
}
client.server.snomasks.Send(sno.LocalAccounts, fmt.Sprintf(ircfmt.Unescape("Client $c[grey][$r%s$c[grey]] logged into account $c[grey][$r%s$c[grey]]"), details.nickMask, details.accountName))
client.server.logger.Info("accounts", "client", details.nick, "logged into account", details.accountName)
}
// AUTHENTICATE [<mechanism>|<data>|*]
func authenticateHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
session := rb.session
config := server.Config()
details := client.Details()
if client.isSTSOnly {
rb.Add(nil, server.name, ERR_SASLFAIL, details.nick, client.t("SASL authentication failed"))
return false
}
if details.account != "" {
rb.Add(nil, server.name, ERR_SASLALREADY, details.nick, client.t("You're already logged into an account"))
return false
}
// sasl abort
if !config.Accounts.AuthenticationEnabled || len(msg.Params) == 1 && msg.Params[0] == "*" {
rb.Add(nil, server.name, ERR_SASLABORTED, details.nick, client.t("SASL authentication aborted"))
session.sasl.Clear()
return false
}
// start new sasl session
if session.sasl.mechanism == "" {
mechanism := strings.ToUpper(msg.Params[0])
_, mechanismIsEnabled := EnabledSaslMechanisms[mechanism]
if mechanismIsEnabled {
session.sasl.mechanism = mechanism
if !config.Server.Compatibility.SendUnprefixedSasl {
// normal behavior
rb.Add(nil, server.name, "AUTHENTICATE", "+")
} else {
// gross hack: send a raw message to ensure no tags or prefix
rb.Flush(true)
rb.session.SendRawMessage(ircmsg.MakeMessage(nil, "", "AUTHENTICATE", "+"), true)
}
} else {
rb.Add(nil, server.name, ERR_SASLFAIL, details.nick, client.t("SASL authentication failed"))
}
return false
}
// continue existing sasl session
rawData := msg.Params[0]
if len(rawData) > 400 {
rb.Add(nil, server.name, ERR_SASLTOOLONG, details.nick, client.t("SASL message too long"))
session.sasl.Clear()
return false
} else if len(rawData) == 400 {
// allow 4 'continuation' lines before rejecting for length
if len(session.sasl.value) >= 400*4 {
rb.Add(nil, server.name, ERR_SASLFAIL, details.nick, client.t("SASL authentication failed: Passphrase too long"))
session.sasl.Clear()
return false
}
session.sasl.value += rawData
return false
}
if rawData != "+" {
session.sasl.value += rawData
}
var data []byte
var err error
if session.sasl.value != "+" {
data, err = base64.StdEncoding.DecodeString(session.sasl.value)
if err != nil {
rb.Add(nil, server.name, ERR_SASLFAIL, details.nick, client.t("SASL authentication failed: Invalid b64 encoding"))
session.sasl.Clear()
return false
}
}
// call actual handler
handler, handlerExists := EnabledSaslMechanisms[session.sasl.mechanism]
// like 100% not required, but it's good to be safe I guess
if !handlerExists {
rb.Add(nil, server.name, ERR_SASLFAIL, details.nick, client.t("SASL authentication failed"))
session.sasl.Clear()
return false
}
// let the SASL handler do its thing
exiting := handler(server, client, session.sasl.mechanism, data, rb)
session.sasl.Clear()
return exiting
}
// AUTHENTICATE PLAIN
func authPlainHandler(server *Server, client *Client, mechanism string, value []byte, rb *ResponseBuffer) bool {
splitValue := bytes.Split(value, []byte{'\000'})
// PLAIN has separate "authorization ID" (which user you want to become)
// and "authentication ID" (whose password you want to use). the first is optional:
// [authzid] \x00 authcid \x00 password
var authzid, authcid string
if len(splitValue) == 3 {
authzid, authcid = string(splitValue[0]), string(splitValue[1])
if authzid != "" && authcid != authzid {
rb.Add(nil, server.name, ERR_SASLFAIL, client.Nick(), client.t("SASL authentication failed: authcid and authzid should be the same"))
return false
}
} else {
rb.Add(nil, server.name, ERR_SASLFAIL, client.Nick(), client.t("SASL authentication failed: Invalid auth blob"))
return false
}
throttled, remainingTime := client.loginThrottle.Touch()
if throttled {
rb.Add(nil, server.name, ERR_SASLFAIL, client.Nick(), fmt.Sprintf(client.t("Please wait at least %v and try again"), remainingTime))
return false
}
password := string(splitValue[2])
err := server.accounts.AuthenticateByPassphrase(client, authcid, password)
if err != nil {
msg := authErrorToMessage(server, err)
rb.Add(nil, server.name, ERR_SASLFAIL, client.Nick(), fmt.Sprintf("%s: %s", client.t("SASL authentication failed"), client.t(msg)))
return false
} else if !fixupNickEqualsAccount(client, rb, server.Config()) {
return false
}
sendSuccessfulAccountAuth(client, rb, false, true)
return false
}
func authErrorToMessage(server *Server, err error) (msg string) {
switch err {
case errAccountDoesNotExist, errAccountUnverified, errAccountInvalidCredentials, errAuthzidAuthcidMismatch, errNickAccountMismatch:
return err.Error()
default:
// don't expose arbitrary error messages to the user
server.logger.Error("internal", "sasl authentication failure", err.Error())
return "Unknown"
}
}
// AUTHENTICATE EXTERNAL
func authExternalHandler(server *Server, client *Client, mechanism string, value []byte, rb *ResponseBuffer) bool {
if rb.session.certfp == "" {
rb.Add(nil, server.name, ERR_SASLFAIL, client.nick, client.t("SASL authentication failed, you are not connecting with a certificate"))
return false
}
// EXTERNAL doesn't carry an authentication ID (this is determined from the
// certificate), but does carry an optional authorization ID.
var authzid string
var err error
if len(value) != 0 {
authzid, err = CasefoldName(string(value))
if err != nil {
err = errAuthzidAuthcidMismatch
}
}
if err == nil {
err = server.accounts.AuthenticateByCertFP(client, rb.session.certfp, authzid)
}
if err != nil {
msg := authErrorToMessage(server, err)
rb.Add(nil, server.name, ERR_SASLFAIL, client.nick, fmt.Sprintf("%s: %s", client.t("SASL authentication failed"), client.t(msg)))
return false
} else if !fixupNickEqualsAccount(client, rb, server.Config()) {
return false
}
sendSuccessfulAccountAuth(client, rb, false, true)
return false
}
// AWAY [<message>]
func awayHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
var isAway bool
var awayMessage string
if len(msg.Params) > 0 {
isAway = true
awayMessage = msg.Params[0]
awayLen := server.Config().Limits.AwayLen
if len(awayMessage) > awayLen {
awayMessage = awayMessage[:awayLen]
}
}
client.SetAway(isAway, awayMessage)
if isAway {
rb.Add(nil, server.name, RPL_NOWAWAY, client.nick, client.t("You have been marked as being away"))
} else {
rb.Add(nil, server.name, RPL_UNAWAY, client.nick, client.t("You are no longer marked as being away"))
}
// dispatch away-notify
details := client.Details()
for session := range client.Friends(caps.AwayNotify) {
if isAway {
session.sendFromClientInternal(false, time.Time{}, "", details.nickMask, details.account, nil, "AWAY", awayMessage)
} else {
session.sendFromClientInternal(false, time.Time{}, "", details.nickMask, details.account, nil, "AWAY")
}
}
return false
}
// BATCH {+,-}reference-tag type [params...]
func batchHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
tag := msg.Params[0]
fail := false
sendErrors := rb.session.batch.command != "NOTICE"
if len(tag) == 0 {
fail = true
} else if tag[0] == '+' {
if len(msg.Params) < 3 || msg.Params[1] != caps.MultilineBatchType {
fail = true
} else {
err := rb.session.StartMultilineBatch(tag[1:], msg.Params[2], rb.Label, msg.ClientOnlyTags())
fail = (err != nil)
if !fail {
// suppress ACK for the initial BATCH message (we'll apply the stored label later)
rb.Label = ""
}
}
} else if tag[0] == '-' {
batch, err := rb.session.EndMultilineBatch(tag[1:])
fail = (err != nil)
if !fail {
histType, err := msgCommandToHistType(batch.command)
if err != nil {
histType = history.Privmsg
batch.command = "PRIVMSG"
}
// XXX changing the label inside a handler is a bit dodgy, but it works here
// because there's no way we could have triggered a flush up to this point
rb.Label = batch.responseLabel
dispatchMessageToTarget(client, batch.tags, histType, batch.command, batch.target, batch.message, rb)
}
}
if fail {
rb.session.EndMultilineBatch("")
if sendErrors {
rb.Add(nil, server.name, "FAIL", "BATCH", "MULTILINE_INVALID", client.t("Invalid multiline batch"))
}
}
return false
}
// BRB [message]
func brbHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
success, duration := client.brbTimer.Enable()
if !success {
rb.Add(nil, server.name, "FAIL", "BRB", "CANNOT_BRB", client.t("Your client does not support BRB"))
return false
} else {
rb.Add(nil, server.name, "BRB", strconv.Itoa(int(duration.Seconds())))
}
var message string
if 0 < len(msg.Params) {
message = msg.Params[0]
} else {
message = client.t("I'll be right back")
}
if len(client.Sessions()) == 1 {
// true BRB
client.SetAway(true, message)
}
return true
}
// CAP <subcmd> [<caps>]
func capHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
details := client.Details()
subCommand := strings.ToUpper(msg.Params[0])
toAdd := caps.NewSet()
toRemove := caps.NewSet()
var capString string
config := server.Config()
supportedCaps := config.Server.supportedCaps
if client.isSTSOnly {
supportedCaps = stsOnlyCaps
}
badCaps := false
if len(msg.Params) > 1 {
capString = msg.Params[1]
strs := strings.Fields(capString)
for _, str := range strs {
remove := false
if str[0] == '-' {
str = str[1:]
remove = true
}
capab, err := caps.NameToCapability(str)
if err != nil || (!remove && !supportedCaps.Has(capab)) {
badCaps = true
} else if !remove {
toAdd.Enable(capab)
} else {
toRemove.Enable(capab)
}
}
}
sendCapLines := func(cset *caps.Set, values caps.Values) {
version := rb.session.capVersion
// we're working around two bugs:
// 1. weechat 1.4 won't accept the CAP reply unless it contains the server.name source
// 2. old versions of Kiwi and The Lounge can't parse multiline CAP LS 302 (#661),
// so try as hard as possible to get the response to fit on one line.
// :server.name CAP * LS * :<tokens>
// 1 7 4
maxLen := 510 - 1 - len(server.name) - 7 - len(subCommand) - 4
capLines := cset.Strings(version, values, maxLen)
for i, capStr := range capLines {
if version >= caps.Cap302 && i < len(capLines)-1 {
rb.Add(nil, server.name, "CAP", details.nick, subCommand, "*", capStr)
} else {
rb.Add(nil, server.name, "CAP", details.nick, subCommand, capStr)
}
}
}
switch subCommand {
case "LS":
if !client.registered {
rb.session.capState = caps.NegotiatingState
}
if 1 < len(msg.Params) {
num, err := strconv.Atoi(msg.Params[1])
newVersion := caps.Version(num)
if err == nil && rb.session.capVersion < newVersion {
rb.session.capVersion = newVersion
}
}
sendCapLines(supportedCaps, config.Server.capValues)
case "LIST":
// values not sent on LIST
sendCapLines(&rb.session.capabilities, nil)
case "REQ":
if !client.registered {
rb.session.capState = caps.NegotiatingState
}
// make sure all capabilities actually exist
// #511, #521: oragono.io/nope is a fake cap to trap bad clients who blindly request
// every offered capability. during registration, requesting it produces a quit,
// otherwise just a CAP NAK
if badCaps || (toAdd.Has(caps.Nope) && client.registered) {
rb.Add(nil, server.name, "CAP", details.nick, "NAK", capString)
return false
} else if toAdd.Has(caps.Nope) && !client.registered {
client.Quit(fmt.Sprintf(client.t("Requesting the %s client capability is forbidden"), caps.Nope.Name()), rb.session)
return true
}
rb.session.capabilities.Union(toAdd)
rb.session.capabilities.Subtract(toRemove)
rb.Add(nil, server.name, "CAP", details.nick, "ACK", capString)
// if this is the first time the client is requesting a resume token,
// send it to them
if toAdd.Has(caps.Resume) {
token, id := server.resumeManager.GenerateToken(client)
if token != "" {
rb.Add(nil, server.name, "RESUME", "TOKEN", token)
rb.session.SetResumeID(id)
}
}
case "END":
if !client.registered {
rb.session.capState = caps.NegotiatedState
}
default:
rb.Add(nil, server.name, ERR_INVALIDCAPCMD, details.nick, subCommand, client.t("Invalid CAP subcommand"))
}
return false
}
// CHATHISTORY <target> <preposition> <query> [<limit>]
// e.g., CHATHISTORY #ircv3 AFTER id=ytNBbt565yt4r3err3 10
// CHATHISTORY <target> BETWEEN <query> <query> <direction> [<limit>]
// e.g., CHATHISTORY #ircv3 BETWEEN timestamp=YYYY-MM-DDThh:mm:ss.sssZ timestamp=YYYY-MM-DDThh:mm:ss.sssZ + 100
func chathistoryHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) (exiting bool) {
var items []history.Item
unknown_command := false
var target string
var channel *Channel
var sequence history.Sequence
var err error
defer func() {
// successful responses are sent as a chathistory or history batch
if err == nil {
if channel != nil {
channel.replayHistoryItems(rb, items, false)
} else {
client.replayPrivmsgHistory(rb, items, target, true)
}
return
}
// errors are sent either without a batch, or in a draft/labeled-response batch as usual
if unknown_command {
rb.Add(nil, server.name, "FAIL", "CHATHISTORY", "UNKNOWN_COMMAND", utils.SafeErrorParam(msg.Params[0]), client.t("Unknown command"))
} else if err == utils.ErrInvalidParams {
rb.Add(nil, server.name, "FAIL", "CHATHISTORY", "INVALID_PARAMETERS", msg.Params[0], client.t("Invalid parameters"))
} else if err != nil {
rb.Add(nil, server.name, "FAIL", "CHATHISTORY", "MESSAGE_ERROR", msg.Params[0], client.t("Messages could not be retrieved"))
} else if sequence == nil {
rb.Add(nil, server.name, "FAIL", "CHATHISTORY", "NO_SUCH_CHANNEL", utils.SafeErrorParam(msg.Params[1]), client.t("No such channel"))
}
}()
config := server.Config()
maxChathistoryLimit := config.History.ChathistoryMax
if maxChathistoryLimit == 0 {
return
}
preposition := strings.ToLower(msg.Params[0])
target = msg.Params[1]
parseQueryParam := func(param string) (msgid string, timestamp time.Time, err error) {
if param == "*" && (preposition == "before" || preposition == "between") {
// XXX compatibility with kiwi, which as of February 2020 is
// using BEFORE * as a synonym for LATEST *
return
}
err = utils.ErrInvalidParams
pieces := strings.SplitN(param, "=", 2)
if len(pieces) < 2 {
return
}
identifier, value := strings.ToLower(pieces[0]), pieces[1]
if identifier == "msgid" {
msgid, err = value, nil
return
} else if identifier == "timestamp" {
timestamp, err = time.Parse(IRCv3TimestampFormat, value)
return
}
return
}
parseHistoryLimit := func(paramIndex int) (limit int) {
if len(msg.Params) < (paramIndex + 1) {
return maxChathistoryLimit
}
limit, err := strconv.Atoi(msg.Params[paramIndex])
if err != nil || limit == 0 || limit > maxChathistoryLimit {
limit = maxChathistoryLimit
}
return
}
channel, sequence, err = server.GetHistorySequence(nil, client, target)
if err != nil || sequence == nil {
return
}
roundUp := func(endpoint time.Time) (result time.Time) {
return endpoint.Truncate(time.Millisecond).Add(time.Millisecond)
}
var start, end history.Selector
var limit int
switch preposition {
case "between":
start.Msgid, start.Time, err = parseQueryParam(msg.Params[2])
if err != nil {
return
}
end.Msgid, end.Time, err = parseQueryParam(msg.Params[3])
if err != nil {
return
}
// XXX preserve the ordering of the two parameters, since we might be going backwards,
// but round up the chronologically first one, whichever it is, to make it exclusive
if !start.Time.IsZero() && !end.Time.IsZero() {
if start.Time.Before(end.Time) {
start.Time = roundUp(start.Time)
} else {
end.Time = roundUp(end.Time)
}
}
limit = parseHistoryLimit(4)
case "before", "after", "around":
start.Msgid, start.Time, err = parseQueryParam(msg.Params[2])
if err != nil {
return
}
if preposition == "after" && !start.Time.IsZero() {
start.Time = roundUp(start.Time)
}
if preposition == "before" {
end = start
start = history.Selector{}
}
limit = parseHistoryLimit(3)
case "latest":
if msg.Params[2] != "*" {
end.Msgid, end.Time, err = parseQueryParam(msg.Params[2])
if err != nil {
return
}
if !end.Time.IsZero() {
end.Time = roundUp(end.Time)
}
start.Time = time.Now().UTC()
}
limit = parseHistoryLimit(3)
default:
unknown_command = true
return
}
if preposition == "around" {
items, err = sequence.Around(start, limit)
} else {
items, _, err = sequence.Between(start, end, limit)
}
return
}
// DEBUG <subcmd>
func debugHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
param := strings.ToUpper(msg.Params[0])
switch param {
case "GCSTATS":
stats := debug.GCStats{
Pause: make([]time.Duration, 10),
PauseQuantiles: make([]time.Duration, 5),
}
debug.ReadGCStats(&stats)
rb.Notice(fmt.Sprintf("last GC: %s", stats.LastGC.Format(time.RFC1123)))
rb.Notice(fmt.Sprintf("num GC: %d", stats.NumGC))
rb.Notice(fmt.Sprintf("pause total: %s", stats.PauseTotal))
rb.Notice(fmt.Sprintf("pause quantiles min%%: %s", stats.PauseQuantiles[0]))
rb.Notice(fmt.Sprintf("pause quantiles 25%%: %s", stats.PauseQuantiles[1]))
rb.Notice(fmt.Sprintf("pause quantiles 50%%: %s", stats.PauseQuantiles[2]))
rb.Notice(fmt.Sprintf("pause quantiles 75%%: %s", stats.PauseQuantiles[3]))
rb.Notice(fmt.Sprintf("pause quantiles max%%: %s", stats.PauseQuantiles[4]))
case "NUMGOROUTINE":
count := runtime.NumGoroutine()
rb.Notice(fmt.Sprintf("num goroutines: %d", count))
case "PROFILEHEAP":
profFile := "oragono.mprof"
file, err := os.Create(profFile)
if err != nil {
rb.Notice(fmt.Sprintf("error: %s", err))
break
}
defer file.Close()
pprof.Lookup("heap").WriteTo(file, 0)
rb.Notice(fmt.Sprintf("written to %s", profFile))
case "STARTCPUPROFILE":
profFile := "oragono.prof"
file, err := os.Create(profFile)
if err != nil {
rb.Notice(fmt.Sprintf("error: %s", err))
break
}
if err := pprof.StartCPUProfile(file); err != nil {
defer file.Close()
rb.Notice(fmt.Sprintf("error: %s", err))
break
}
rb.Notice(fmt.Sprintf("CPU profile writing to %s", profFile))
case "STOPCPUPROFILE":
pprof.StopCPUProfile()
rb.Notice(fmt.Sprintf("CPU profiling stopped"))
case "CRASHSERVER":
if !client.HasRoleCapabs("rehash") {
rb.Notice(client.t("You must have rehash permissions in order to execute DEBUG CRASHSERVER"))
return false
}
code := utils.ConfirmationCode(server.name, server.ctime)
if len(msg.Params) == 1 || msg.Params[1] != code {
rb.Notice(fmt.Sprintf(client.t("To crash the server, issue the following command: /DEBUG CRASHSERVER %s"), code))
return false
}
server.logger.Error("server", fmt.Sprintf("DEBUG CRASHSERVER executed by operator %s", client.Oper().Name))
go func() {
// intentional nil dereference on a new goroutine, bypassing recover-from-errors
var i, j *int
*i = *j
}()
default:
rb.Notice(client.t("Unrecognized DEBUG subcommand"))
}
return false
}
// helper for parsing the reason args to DLINE and KLINE
func getReasonsFromParams(params []string, currentArg int) (reason, operReason string) {
reason = "No reason given"
operReason = ""
if len(params) > currentArg {
reasons := strings.SplitN(strings.Join(params[currentArg:], " "), "|", 2)
if len(reasons) == 1 {
reason = strings.TrimSpace(reasons[0])
} else if len(reasons) == 2 {
reason = strings.TrimSpace(reasons[0])
operReason = strings.TrimSpace(reasons[1])
}
}
return
}
func formatBanForListing(client *Client, key string, info IPBanInfo) string {
desc := info.Reason
if info.OperReason != "" && info.OperReason != info.Reason {
desc = fmt.Sprintf("%s | %s", info.Reason, info.OperReason)
}
if info.Duration != 0 {
desc = fmt.Sprintf("%s [%s]", desc, info.TimeLeft())
}
return fmt.Sprintf(client.t("Ban - %[1]s - added by %[2]s - %[3]s"), key, info.OperName, desc)
}
// DLINE [ANDKILL] [MYSELF] [duration] <ip>/<net> [ON <server>] [reason [| oper reason]]
// DLINE LIST
func dlineHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
// check oper permissions
oper := client.Oper()
if oper == nil || !oper.Class.Capabilities.Has("local_ban") {
rb.Add(nil, server.name, ERR_NOPRIVS, client.nick, msg.Command, client.t("Insufficient oper privs"))
return false
}
currentArg := 0
// if they say LIST, we just list the current dlines
if len(msg.Params) == currentArg+1 && strings.ToLower(msg.Params[currentArg]) == "list" {
bans := server.dlines.AllBans()
if len(bans) == 0 {
rb.Notice(client.t("No DLINEs have been set!"))
}
for key, info := range bans {
client.Notice(formatBanForListing(client, key, info))
}
return false
}
// when setting a ban, if they say "ANDKILL" we should also kill all users who match it
var andKill bool
if len(msg.Params) > currentArg+1 && strings.ToLower(msg.Params[currentArg]) == "andkill" {
andKill = true
currentArg++
}
// when setting a ban that covers the oper's current connection, we require them to say
// "DLINE MYSELF" so that we're sure they really mean it.
var dlineMyself bool
if len(msg.Params) > currentArg+1 && strings.ToLower(msg.Params[currentArg]) == "myself" {
dlineMyself = true
currentArg++
}
// duration
duration, err := custime.ParseDuration(msg.Params[currentArg])
if err != nil {
duration = 0
} else {
currentArg++
}
// get host
if len(msg.Params) < currentArg+1 {
rb.Add(nil, server.name, ERR_NEEDMOREPARAMS, client.nick, msg.Command, client.t("Not enough parameters"))
return false
}
hostString := msg.Params[currentArg]
currentArg++
// check host
hostNet, err := utils.NormalizedNetFromString(hostString)
if err != nil {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, client.nick, msg.Command, client.t("Could not parse IP address or CIDR network"))
return false
}
if !dlineMyself && hostNet.Contains(client.IP()) {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, client.nick, msg.Command, client.t("This ban matches you. To DLINE yourself, you must use the command: /DLINE MYSELF <arguments>"))
return false
}
// check remote
if len(msg.Params) > currentArg && msg.Params[currentArg] == "ON" {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, client.nick, msg.Command, client.t("Remote servers not yet supported"))
return false
}
// get comment(s)
reason, operReason := getReasonsFromParams(msg.Params, currentArg)
operName := oper.Name
if operName == "" {
operName = server.name
}
err = server.dlines.AddNetwork(hostNet, duration, reason, operReason, operName)
if err != nil {
rb.Notice(fmt.Sprintf(client.t("Could not successfully save new D-LINE: %s"), err.Error()))
return false
}
var snoDescription string
hostString = utils.NetToNormalizedString(hostNet)
if duration != 0 {
rb.Notice(fmt.Sprintf(client.t("Added temporary (%[1]s) D-Line for %[2]s"), duration.String(), hostString))
snoDescription = fmt.Sprintf(ircfmt.Unescape("%s [%s]$r added temporary (%s) D-Line for %s"), client.nick, operName, duration.String(), hostString)
} else {
rb.Notice(fmt.Sprintf(client.t("Added D-Line for %s"), hostString))
snoDescription = fmt.Sprintf(ircfmt.Unescape("%s [%s]$r added D-Line for %s"), client.nick, operName, hostString)
}
server.snomasks.Send(sno.LocalXline, snoDescription)
var killClient bool
if andKill {
var clientsToKill []*Client
var killedClientNicks []string
for _, mcl := range server.clients.AllClients() {
if hostNet.Contains(mcl.IP()) {
clientsToKill = append(clientsToKill, mcl)
killedClientNicks = append(killedClientNicks, mcl.nick)
}
}
for _, mcl := range clientsToKill {
mcl.SetExitedSnomaskSent()
mcl.Quit(fmt.Sprintf(mcl.t("You have been banned from this server (%s)"), reason), nil)
if mcl == client {
killClient = true
} else {
// if mcl == client, we kill them below
mcl.destroy(nil)
}
}
// send snomask
sort.Strings(killedClientNicks)
server.snomasks.Send(sno.LocalKills, fmt.Sprintf(ircfmt.Unescape("%s [%s] killed %d clients with a DLINE $c[grey][$r%s$c[grey]]"), client.nick, operName, len(killedClientNicks), strings.Join(killedClientNicks, ", ")))
}
return killClient
}
// HELP [<query>]
func helpHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
argument := strings.ToLower(strings.TrimSpace(strings.Join(msg.Params, " ")))
if len(argument) < 1 {
client.sendHelp("HELPOP", client.t(`HELPOP <argument>
Get an explanation of <argument>, or "index" for a list of help topics.`), rb)
return false
}
// handle index
if argument == "index" {
client.sendHelp("HELP", server.helpIndexManager.GetIndex(client.Languages(), client.HasMode(modes.Operator)), rb)
return false
}
helpHandler, exists := Help[argument]
if exists && (!helpHandler.oper || (helpHandler.oper && client.HasMode(modes.Operator))) {
if helpHandler.textGenerator != nil {
client.sendHelp(strings.ToUpper(argument), helpHandler.textGenerator(client), rb)
} else {
client.sendHelp(strings.ToUpper(argument), client.t(helpHandler.text), rb)
}
} else {
args := msg.Params
args = append(args, client.t("Help not found"))
rb.Add(nil, server.name, ERR_HELPNOTFOUND, args...)
}
return false
}
// HISTORY <target> [<limit>]
// e.g., HISTORY #ubuntu 10
// HISTORY me 15
// HISTORY #darwin 1h
func historyHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
config := server.Config()
if !config.History.Enabled {
rb.Notice(client.t("This command has been disabled by the server administrators"))
return false
}
target := msg.Params[0]
if strings.ToLower(target) == "me" {
target = "*"
}
channel, sequence, err := server.GetHistorySequence(nil, client, target)
if sequence == nil || err != nil {
// whatever
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.Nick(), utils.SafeErrorParam(target), client.t("No such channel"))
return false
}
var duration time.Duration
maxChathistoryLimit := config.History.ChathistoryMax
limit := 100
if maxChathistoryLimit < limit {
limit = maxChathistoryLimit
}
if len(msg.Params) > 1 {
providedLimit, err := strconv.Atoi(msg.Params[1])
if err == nil && providedLimit != 0 {
limit = providedLimit
if maxChathistoryLimit < limit {
limit = maxChathistoryLimit
}
} else if err != nil {
duration, err = time.ParseDuration(msg.Params[1])
if err == nil {
limit = maxChathistoryLimit
}
}
}
var items []history.Item
if duration == 0 {
items, _, err = sequence.Between(history.Selector{}, history.Selector{}, limit)
} else {
now := time.Now().UTC()
start := history.Selector{Time: now}
end := history.Selector{Time: now.Add(-duration)}
items, _, err = sequence.Between(start, end, limit)
}
if err == nil && len(items) != 0 {
if channel != nil {
channel.replayHistoryItems(rb, items, false)
} else {
client.replayPrivmsgHistory(rb, items, "", true)
}
}
return false
}
// INFO
func infoHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
// we do the below so that the human-readable lines in info can be translated.
for _, line := range infoString1 {
rb.Add(nil, server.name, RPL_INFO, client.nick, line)
}
rb.Add(nil, server.name, RPL_INFO, client.nick, client.t("Oragono is released under the MIT license."))
rb.Add(nil, server.name, RPL_INFO, client.nick, "")
rb.Add(nil, server.name, RPL_INFO, client.nick, client.t("Core Developers:"))
for _, line := range infoString2 {
rb.Add(nil, server.name, RPL_INFO, client.nick, line)
}
rb.Add(nil, server.name, RPL_INFO, client.nick, client.t("Former Core Developers:"))
for _, line := range infoString3 {
rb.Add(nil, server.name, RPL_INFO, client.nick, line)
}
rb.Add(nil, server.name, RPL_INFO, client.nick, client.t("For a more complete list of contributors, see our changelog:"))
rb.Add(nil, server.name, RPL_INFO, client.nick, " https://github.com/oragono/oragono/blob/master/CHANGELOG.md")
rb.Add(nil, server.name, RPL_INFO, client.nick, "")
// show translators for languages other than good ole' regular English
tlines := server.Languages().Translators()
if 0 < len(tlines) {
rb.Add(nil, server.name, RPL_INFO, client.nick, client.t("Translators:"))
for _, line := range tlines {
rb.Add(nil, server.name, RPL_INFO, client.nick, " "+strings.Replace(line, "\n", ", ", -1))
}
rb.Add(nil, server.name, RPL_INFO, client.nick, "")
}
rb.Add(nil, server.name, RPL_ENDOFINFO, client.nick, client.t("End of /INFO"))
return false
}
// INVITE <nickname> <channel>
func inviteHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
nickname := msg.Params[0]
channelName := msg.Params[1]
target := server.clients.Get(nickname)
if target == nil {
rb.Add(nil, server.name, ERR_NOSUCHNICK, client.Nick(), utils.SafeErrorParam(nickname), client.t("No such nick"))
return false
}
channel := server.channels.Get(channelName)
if channel == nil {
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.Nick(), utils.SafeErrorParam(channelName), client.t("No such channel"))
return false
}
channel.Invite(target, client, rb)
return false
}
// ISON <nick>{ <nick>}
func isonHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
var nicks = msg.Params
ison := make([]string, 0, len(msg.Params))
for _, nick := range nicks {
currentNick := server.getCurrentNick(nick)
if currentNick != "" {
ison = append(ison, currentNick)
}
}
rb.Add(nil, server.name, RPL_ISON, client.nick, strings.Join(ison, " "))
return false
}
// JOIN <channel>{,<channel>} [<key>{,<key>}]
func joinHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
// kill JOIN 0 requests
if msg.Params[0] == "0" {
rb.Notice(client.t("JOIN 0 is not allowed"))
return false
}
// handle regular JOINs
channels := strings.Split(msg.Params[0], ",")
var keys []string
if len(msg.Params) > 1 {
keys = strings.Split(msg.Params[1], ",")
}
config := server.Config()
oper := client.Oper()
for i, name := range channels {
if name == "" {
continue // #679
}
if config.Channels.MaxChannelsPerClient <= client.NumChannels() && oper == nil {
rb.Add(nil, server.name, ERR_TOOMANYCHANNELS, client.Nick(), name, client.t("You have joined too many channels"))
return false
}
var key string
if len(keys) > i {
key = keys[i]
}
err := server.channels.Join(client, name, key, false, rb)
if err != nil {
sendJoinError(client, name, rb, err)
}
}
return false
}
func sendJoinError(client *Client, name string, rb *ResponseBuffer, err error) {
var errMsg string
switch err {
case errInsufficientPrivs:
errMsg = `Only server operators can create new channels`
case errConfusableIdentifier:
errMsg = `That channel name is too close to the name of another channel`
case errChannelPurged:
errMsg = err.Error()
default:
errMsg = `No such channel`
}
rb.Add(nil, client.server.name, ERR_NOSUCHCHANNEL, client.Nick(), utils.SafeErrorParam(name), client.t(errMsg))
}
// SAJOIN [nick] #channel{,#channel}
func sajoinHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
var target *Client
var channelString string
if strings.HasPrefix(msg.Params[0], "#") {
target = client
channelString = msg.Params[0]
} else {
if len(msg.Params) == 1 {
rb.Add(nil, server.name, ERR_NEEDMOREPARAMS, client.Nick(), "SAJOIN", client.t("Not enough parameters"))
return false
} else {
target = server.clients.Get(msg.Params[0])
if target == nil {
rb.Add(nil, server.name, ERR_NOSUCHNICK, client.Nick(), utils.SafeErrorParam(msg.Params[0]), "No such nick")
return false
}
channelString = msg.Params[1]
}
}
channels := strings.Split(channelString, ",")
for _, chname := range channels {
err := server.channels.Join(target, chname, "", true, rb)
if err != nil {
sendJoinError(client, chname, rb, err)
}
}
return false
}
// KICK <channel>{,<channel>} <user>{,<user>} [<comment>]
func kickHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
channels := strings.Split(msg.Params[0], ",")
users := strings.Split(msg.Params[1], ",")
if (len(channels) != len(users)) && (len(users) != 1) {
rb.Add(nil, server.name, ERR_NEEDMOREPARAMS, client.nick, "KICK", client.t("Not enough parameters"))
return false
}
type kickCmd struct {
channel string
nick string
}
kicks := make([]kickCmd, 0, len(channels))
for index, channel := range channels {
if channel == "" {
continue // #679
}
if len(users) == 1 {
kicks = append(kicks, kickCmd{channel, users[0]})
} else {
kicks = append(kicks, kickCmd{channel, users[index]})
}
}
var comment string
if len(msg.Params) > 2 {
comment = msg.Params[2]
}
for _, kick := range kicks {
channel := server.channels.Get(kick.channel)
if channel == nil {
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, utils.SafeErrorParam(kick.channel), client.t("No such channel"))
continue
}
target := server.clients.Get(kick.nick)
if target == nil {
rb.Add(nil, server.name, ERR_NOSUCHNICK, client.nick, utils.SafeErrorParam(kick.nick), client.t("No such nick"))
continue
}
if comment == "" {
comment = kick.nick
}
channel.Kick(client, target, comment, rb, false)
}
return false
}
// KILL <nickname> <comment>
func killHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
nickname := msg.Params[0]
comment := "<no reason supplied>"
if len(msg.Params) > 1 {
comment = msg.Params[1]
}
target := server.clients.Get(nickname)
if target == nil {
rb.Add(nil, client.server.name, ERR_NOSUCHNICK, client.nick, utils.SafeErrorParam(nickname), client.t("No such nick"))
return false
}
quitMsg := fmt.Sprintf("Killed (%s (%s))", client.nick, comment)
server.snomasks.Send(sno.LocalKills, fmt.Sprintf(ircfmt.Unescape("%s$r was killed by %s $c[grey][$r%s$c[grey]]"), target.nick, client.nick, comment))
target.SetExitedSnomaskSent()
target.Quit(quitMsg, nil)
target.destroy(nil)
return false
}
// KLINE [ANDKILL] [MYSELF] [duration] <mask> [ON <server>] [reason [| oper reason]]
// KLINE LIST
func klineHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
details := client.Details()
// check oper permissions
oper := client.Oper()
if oper == nil || !oper.Class.Capabilities.Has("local_ban") {
rb.Add(nil, server.name, ERR_NOPRIVS, details.nick, msg.Command, client.t("Insufficient oper privs"))
return false
}
currentArg := 0
// if they say LIST, we just list the current klines
if len(msg.Params) == currentArg+1 && strings.ToLower(msg.Params[currentArg]) == "list" {
bans := server.klines.AllBans()
if len(bans) == 0 {
client.Notice("No KLINEs have been set!")
}
for key, info := range bans {
client.Notice(formatBanForListing(client, key, info))
}
return false
}
// when setting a ban, if they say "ANDKILL" we should also kill all users who match it
var andKill bool
if len(msg.Params) > currentArg+1 && strings.ToLower(msg.Params[currentArg]) == "andkill" {
andKill = true
currentArg++
}
// when setting a ban that covers the oper's current connection, we require them to say
// "KLINE MYSELF" so that we're sure they really mean it.
var klineMyself bool
if len(msg.Params) > currentArg+1 && strings.ToLower(msg.Params[currentArg]) == "myself" {
klineMyself = true
currentArg++
}
// duration
duration, err := custime.ParseDuration(msg.Params[currentArg])
if err != nil {
duration = 0
} else {
currentArg++
}
// get mask
if len(msg.Params) < currentArg+1 {
rb.Add(nil, server.name, ERR_NEEDMOREPARAMS, details.nick, msg.Command, client.t("Not enough parameters"))
return false
}
mask := msg.Params[currentArg]
currentArg++
// check mask
mask, err = CanonicalizeMaskWildcard(mask)
if err != nil {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, details.nick, msg.Command, client.t("Erroneous nickname"))
return false
}
matcher := ircmatch.MakeMatch(mask)
for _, clientMask := range client.AllNickmasks() {
if !klineMyself && matcher.Match(clientMask) {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, details.nick, msg.Command, client.t("This ban matches you. To KLINE yourself, you must use the command: /KLINE MYSELF <arguments>"))
return false
}
}
// check remote
if len(msg.Params) > currentArg && msg.Params[currentArg] == "ON" {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, details.nick, msg.Command, client.t("Remote servers not yet supported"))
return false
}
// get oper name
operName := oper.Name
if operName == "" {
operName = server.name
}
// get comment(s)
reason, operReason := getReasonsFromParams(msg.Params, currentArg)
err = server.klines.AddMask(mask, duration, reason, operReason, operName)
if err != nil {
rb.Notice(fmt.Sprintf(client.t("Could not successfully save new K-LINE: %s"), err.Error()))
return false
}
var snoDescription string
if duration != 0 {
rb.Notice(fmt.Sprintf(client.t("Added temporary (%[1]s) K-Line for %[2]s"), duration.String(), mask))
snoDescription = fmt.Sprintf(ircfmt.Unescape("%s [%s]$r added temporary (%s) K-Line for %s"), details.nick, operName, duration.String(), mask)
} else {
rb.Notice(fmt.Sprintf(client.t("Added K-Line for %s"), mask))
snoDescription = fmt.Sprintf(ircfmt.Unescape("%s [%s]$r added K-Line for %s"), details.nick, operName, mask)
}
server.snomasks.Send(sno.LocalXline, snoDescription)
var killClient bool
if andKill {
var clientsToKill []*Client
var killedClientNicks []string
for _, mcl := range server.clients.AllClients() {
for _, clientMask := range mcl.AllNickmasks() {
if matcher.Match(clientMask) {
clientsToKill = append(clientsToKill, mcl)
killedClientNicks = append(killedClientNicks, mcl.nick)
}
}
}
for _, mcl := range clientsToKill {
mcl.SetExitedSnomaskSent()
mcl.Quit(fmt.Sprintf(mcl.t("You have been banned from this server (%s)"), reason), nil)
if mcl == client {
killClient = true
} else {
// if mcl == client, we kill them below
mcl.destroy(nil)
}
}
// send snomask
sort.Strings(killedClientNicks)
server.snomasks.Send(sno.LocalKills, fmt.Sprintf(ircfmt.Unescape("%s [%s] killed %d clients with a KLINE $c[grey][$r%s$c[grey]]"), details.nick, operName, len(killedClientNicks), strings.Join(killedClientNicks, ", ")))
}
return killClient
}
// LANGUAGE <code>{ <code>}
func languageHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
nick := client.Nick()
alreadyDoneLanguages := make(map[string]bool)
var appliedLanguages []string
lm := server.Languages()
supportedLanguagesCount := lm.Count()
if supportedLanguagesCount < len(msg.Params) {
rb.Add(nil, client.server.name, ERR_TOOMANYLANGUAGES, nick, strconv.Itoa(supportedLanguagesCount), client.t("You specified too many languages"))
return false
}
for _, value := range msg.Params {
value = strings.ToLower(value)
// strip ~ from the language if it has it
value = strings.TrimPrefix(value, "~")
// silently ignore empty languages or those with spaces in them
if len(value) == 0 || strings.Contains(value, " ") {
continue
}
_, exists := lm.Languages[value]
if !exists {
rb.Add(nil, client.server.name, ERR_NOLANGUAGE, nick, fmt.Sprintf(client.t("Language %s is not supported by this server"), value))
return false
}
// if we've already applied the given language, skip it
_, exists = alreadyDoneLanguages[value]
if exists {
continue
}
appliedLanguages = append(appliedLanguages, value)
}
var langsToSet []string
if !(len(appliedLanguages) == 1 && appliedLanguages[0] == "en") {
langsToSet = appliedLanguages
}
client.SetLanguages(langsToSet)
params := make([]string, len(appliedLanguages)+2)
params[0] = nick
copy(params[1:], appliedLanguages)
params[len(params)-1] = client.t("Language preferences have been set")
rb.Add(nil, client.server.name, RPL_YOURLANGUAGESARE, params...)
return false
}
// LIST [<channel>{,<channel>}] [<elistcond>{,<elistcond>}]
func listHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
config := server.Config()
if time.Since(client.ctime) < config.Channels.ListDelay && client.Account() == "" && !client.HasMode(modes.Operator) {
remaining := time.Until(client.ctime.Add(config.Channels.ListDelay))
csNotice(rb, fmt.Sprintf(client.t("This server requires that you wait %v after connecting before you can use /LIST. You have %v left."), config.Channels.ListDelay, remaining))
rb.Add(nil, server.name, RPL_LISTEND, client.Nick(), client.t("End of LIST"))
return false
}
// get channels
var channels []string
for _, param := range msg.Params {
if 0 < len(param) && param[0] == '#' {
for _, channame := range strings.Split(param, ",") {
if 0 < len(channame) && channame[0] == '#' {
channels = append(channels, channame)
}
}
}
}
// get elist conditions
var matcher elistMatcher
for _, param := range msg.Params {
if len(param) < 1 {
continue
}
if param[0] == '<' {
param = param[1:]
val, err := strconv.Atoi(param)
if err != nil {
continue
}
matcher.MaxClientsActive = true
matcher.MaxClients = val - 1 // -1 because < means less than the given number
}
if param[0] == '>' {
param = param[1:]
val, err := strconv.Atoi(param)
if err != nil {
continue
}
matcher.MinClientsActive = true
matcher.MinClients = val + 1 // +1 because > means more than the given number
}
}
clientIsOp := client.HasMode(modes.Operator)
if len(channels) == 0 {
for _, channel := range server.channels.Channels() {
if !clientIsOp && channel.flags.HasMode(modes.Secret) {
continue
}
if matcher.Matches(channel) {
client.RplList(channel, rb)
}
}
} else {
// limit regular users to only listing one channel
if !clientIsOp {
channels = channels[:1]
}
for _, chname := range channels {
channel := server.channels.Get(chname)
if channel == nil || (!clientIsOp && channel.flags.HasMode(modes.Secret)) {
if len(chname) > 0 {
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, utils.SafeErrorParam(chname), client.t("No such channel"))
}
continue
}
if matcher.Matches(channel) {
client.RplList(channel, rb)
}
}
}
rb.Add(nil, server.name, RPL_LISTEND, client.nick, client.t("End of LIST"))
return false
}
// LUSERS [<mask> [<server>]]
func lusersHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
server.Lusers(client, rb)
return false
}
// MODE <target> [<modestring> [<mode arguments>...]]
func modeHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
if 0 < len(msg.Params[0]) && msg.Params[0][0] == '#' {
return cmodeHandler(server, client, msg, rb)
}
return umodeHandler(server, client, msg, rb)
}
// MODE <channel> [<modestring> [<mode arguments>...]]
func cmodeHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
channel := server.channels.Get(msg.Params[0])
if channel == nil {
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, utils.SafeErrorParam(msg.Params[0]), client.t("No such channel"))
return false
}
var changes modes.ModeChanges
if 1 < len(msg.Params) {
// parse out real mode changes
params := msg.Params[1:]
var unknown map[rune]bool
changes, unknown = modes.ParseChannelModeChanges(params...)
// alert for unknown mode changes
for char := range unknown {
rb.Add(nil, server.name, ERR_UNKNOWNMODE, client.nick, string(char), client.t("is an unknown mode character to me"))
}
if len(unknown) == 1 && len(changes) == 0 {
return false
}
}
// process mode changes, include list operations (an empty set of changes does a list)
applied := channel.ApplyChannelModeChanges(client, msg.Command == "SAMODE", changes, rb)
details := client.Details()
announceCmodeChanges(channel, applied, details.nickMask, details.accountName, rb)
return false
}
func announceCmodeChanges(channel *Channel, applied modes.ModeChanges, source, accountName string, rb *ResponseBuffer) {
// send out changes
if len(applied) > 0 {
message := utils.MakeMessage("")
changeStrings := applied.Strings()
for _, changeString := range changeStrings {
message.Split = append(message.Split, utils.MessagePair{Message: changeString})
}
args := append([]string{channel.name}, changeStrings...)
rb.AddFromClient(message.Time, message.Msgid, source, accountName, nil, "MODE", args...)
for _, member := range channel.Members() {
for _, session := range member.Sessions() {
if session != rb.session {
session.sendFromClientInternal(false, message.Time, message.Msgid, source, accountName, nil, "MODE", args...)
}
}
}
channel.AddHistoryItem(history.Item{
Type: history.Mode,
Nick: source,
AccountName: accountName,
Message: message,
})
}
}
// MODE <client> [<modestring> [<mode arguments>...]]
func umodeHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
cDetails := client.Details()
target := server.clients.Get(msg.Params[0])
if target == nil {
rb.Add(nil, server.name, ERR_NOSUCHNICK, cDetails.nick, utils.SafeErrorParam(msg.Params[0]), client.t("No such nick"))
return false
}
targetNick := target.Nick()
hasPrivs := client == target || msg.Command == "SAMODE"
if !hasPrivs {
if len(msg.Params) > 1 {
rb.Add(nil, server.name, ERR_USERSDONTMATCH, cDetails.nick, client.t("Can't change modes for other users"))
} else {
rb.Add(nil, server.name, ERR_USERSDONTMATCH, cDetails.nick, client.t("Can't view modes for other users"))
}
return false
}
// applied mode changes
applied := make(modes.ModeChanges, 0)
if 1 < len(msg.Params) {
// parse out real mode changes
params := msg.Params[1:]
changes, unknown := modes.ParseUserModeChanges(params...)
// alert for unknown mode changes
for char := range unknown {
rb.Add(nil, server.name, ERR_UNKNOWNMODE, cDetails.nick, string(char), client.t("is an unknown mode character to me"))
}
if len(unknown) == 1 && len(changes) == 0 {
return false
}
// apply mode changes
applied = ApplyUserModeChanges(target, changes, msg.Command == "SAMODE", nil)
}
if len(applied) > 0 {
args := append([]string{targetNick}, applied.Strings()...)
rb.Add(nil, cDetails.nickMask, "MODE", args...)
} else if hasPrivs {
rb.Add(nil, server.name, RPL_UMODEIS, targetNick, target.ModeString())
if target.HasMode(modes.LocalOperator) || target.HasMode(modes.Operator) {
masks := server.snomasks.String(target)
if 0 < len(masks) {
rb.Add(nil, server.name, RPL_SNOMASKIS, targetNick, masks, client.t("Server notice masks"))
}
}
}
return false
}
// get the correct capitalization of a nick (if it's online), otherwise return ""
func (server *Server) getCurrentNick(nick string) (result string) {
if service, isService := OragonoServices[strings.ToLower(nick)]; isService {
return service.Name
} else if iclient := server.clients.Get(nick); iclient != nil {
return iclient.Nick()
}
return ""
}
// MONITOR <subcmd> [params...]
func monitorHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
handler, exists := monitorSubcommands[strings.ToLower(msg.Params[0])]
if !exists {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, client.Nick(), "MONITOR", msg.Params[0], client.t("Unknown subcommand"))
return false
}
return handler(server, client, msg, rb)
}
// MONITOR - <target>{,<target>}
func monitorRemoveHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
if len(msg.Params) < 2 {
rb.Add(nil, server.name, ERR_NEEDMOREPARAMS, client.Nick(), msg.Command, client.t("Not enough parameters"))
return false
}
targets := strings.Split(msg.Params[1], ",")
for _, target := range targets {
cfnick, err := CasefoldName(target)
if err != nil {
continue
}
server.monitorManager.Remove(client, cfnick)
}
return false
}
// MONITOR + <target>{,<target>}
func monitorAddHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
if len(msg.Params) < 2 {
rb.Add(nil, server.name, ERR_NEEDMOREPARAMS, client.Nick(), msg.Command, client.t("Not enough parameters"))
return false
}
var online []string
var offline []string
limits := server.Config().Limits
targets := strings.Split(msg.Params[1], ",")
for _, target := range targets {
// check name length
if len(target) < 1 || len(targets) > limits.NickLen {
continue
}
// add target
casefoldedTarget, err := CasefoldName(target)
if err != nil {
continue
}
err = server.monitorManager.Add(client, casefoldedTarget, limits.MonitorEntries)
if err == errMonitorLimitExceeded {
rb.Add(nil, server.name, ERR_MONLISTFULL, client.Nick(), strconv.Itoa(limits.MonitorEntries), strings.Join(targets, ","))
break
} else if err != nil {
continue
}
currentNick := server.getCurrentNick(target)
// add to online / offline lists
if currentNick != "" {
online = append(online, currentNick)
} else {
offline = append(offline, target)
}
}
if len(online) > 0 {
rb.Add(nil, server.name, RPL_MONONLINE, client.Nick(), strings.Join(online, ","))
}
if len(offline) > 0 {
rb.Add(nil, server.name, RPL_MONOFFLINE, client.Nick(), strings.Join(offline, ","))
}
return false
}
// MONITOR C
func monitorClearHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
server.monitorManager.RemoveAll(client)
return false
}
// MONITOR L
func monitorListHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
nick := client.Nick()
monitorList := server.monitorManager.List(client)
var nickList []string
for _, cfnick := range monitorList {
replynick := cfnick
currentNick := server.getCurrentNick(cfnick)
// report the uncasefolded nick if it's available, i.e., the client is online
if currentNick != "" {
replynick = currentNick
}
nickList = append(nickList, replynick)
}
for _, line := range utils.ArgsToStrings(maxLastArgLength, nickList, ",") {
rb.Add(nil, server.name, RPL_MONLIST, nick, line)
}
rb.Add(nil, server.name, RPL_ENDOFMONLIST, nick, "End of MONITOR list")
return false
}
// MONITOR S
func monitorStatusHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
var online []string
var offline []string
monitorList := server.monitorManager.List(client)
for _, name := range monitorList {
currentNick := server.getCurrentNick(name)
if currentNick != "" {
online = append(online, currentNick)
} else {
offline = append(offline, name)
}
}
if len(online) > 0 {
for _, line := range utils.ArgsToStrings(maxLastArgLength, online, ",") {
rb.Add(nil, server.name, RPL_MONONLINE, client.Nick(), line)
}
}
if len(offline) > 0 {
for _, line := range utils.ArgsToStrings(maxLastArgLength, offline, ",") {
rb.Add(nil, server.name, RPL_MONOFFLINE, client.Nick(), line)
}
}
return false
}
// MOTD
func motdHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
server.MOTD(client, rb)
return false
}
// NAMES [<channel>{,<channel>} [target]]
func namesHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
var channels []string
if len(msg.Params) > 0 {
channels = strings.Split(msg.Params[0], ",")
}
// TODO: in a post-federation world, process `target` (server to forward request to)
// implement the modern behavior: https://modern.ircdocs.horse/#names-message
// "Servers MAY only return information about the first <channel> and silently ignore the others."
// "If no parameter is given for this command, servers SHOULD return one RPL_ENDOFNAMES numeric
// with the <channel> parameter set to an asterix character"
if len(channels) == 0 {
rb.Add(nil, server.name, RPL_ENDOFNAMES, client.Nick(), "*", client.t("End of NAMES list"))
return false
}
chname := channels[0]
success := false
channel := server.channels.Get(chname)
if channel != nil {
if !channel.flags.HasMode(modes.Secret) || channel.hasClient(client) || client.HasMode(modes.Operator) {
channel.Names(client, rb)
success = true
}
}
if !success { // channel.Names() sends this numeric itself on success
rb.Add(nil, server.name, RPL_ENDOFNAMES, client.Nick(), chname, client.t("End of NAMES list"))
}
return false
}
// NICK <nickname>
func nickHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
if client.registered {
performNickChange(server, client, client, nil, msg.Params[0], rb)
} else {
client.preregNick = msg.Params[0]
}
return false
}
// helper to store a batched PRIVMSG in the session object
func absorbBatchedMessage(server *Server, client *Client, msg ircmsg.IrcMessage, batchTag string, histType history.ItemType, rb *ResponseBuffer) {
if batchTag != rb.session.batch.label {
if histType != history.Notice {
rb.Add(nil, server.name, "FAIL", "BATCH", "MULTILINE_INVALID", client.t("Incorrect batch tag sent"))
}
rb.session.EndMultilineBatch("")
return
} else if len(msg.Params) < 2 || msg.Params[1] == "" {
if histType != history.Notice {
rb.Add(nil, server.name, "FAIL", "BATCH", "MULTILINE_INVALID", client.t("Invalid multiline batch"))
}
rb.session.EndMultilineBatch("")
return
}
rb.session.batch.command = msg.Command
isConcat, _ := msg.GetTag(caps.MultilineConcatTag)
rb.session.batch.message.Append(msg.Params[1], isConcat)
config := server.Config()
if config.Limits.Multiline.MaxBytes < rb.session.batch.message.LenBytes() {
if histType != history.Notice {
rb.Add(nil, server.name, "FAIL", "BATCH", "MULTILINE_MAX_BYTES", strconv.Itoa(config.Limits.Multiline.MaxBytes))
}
rb.session.EndMultilineBatch("")
} else if config.Limits.Multiline.MaxLines != 0 && config.Limits.Multiline.MaxLines < rb.session.batch.message.LenLines() {
if histType != history.Notice {
rb.Add(nil, server.name, "FAIL", "BATCH", "MULTILINE_MAX_LINES", strconv.Itoa(config.Limits.Multiline.MaxLines))
}
rb.session.EndMultilineBatch("")
}
}
// NOTICE <target>{,<target>} <message>
// PRIVMSG <target>{,<target>} <message>
// TAGMSG <target>{,<target>}
func messageHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
histType, err := msgCommandToHistType(msg.Command)
if err != nil {
return false
}
if isBatched, batchTag := msg.GetTag("batch"); isBatched {
absorbBatchedMessage(server, client, msg, batchTag, histType, rb)
return false
}
cnick := client.Nick()
clientOnlyTags := msg.ClientOnlyTags()
if histType == history.Tagmsg && len(clientOnlyTags) == 0 {
// nothing to do
return false
}
targets := strings.Split(msg.Params[0], ",")
var message string
if len(msg.Params) > 1 {
message = msg.Params[1]
}
if histType != history.Tagmsg && message == "" {
rb.Add(nil, server.name, ERR_NOTEXTTOSEND, cnick, client.t("No text to send"))
return false
}
if rb.session.isTor && utils.IsRestrictedCTCPMessage(message) {
// note that error replies are never sent for NOTICE
if histType != history.Notice {
rb.Notice(client.t("CTCP messages are disabled over Tor"))
}
return false
}
for i, targetString := range targets {
// max of four targets per privmsg
if i == maxTargets {
break
}
// each target gets distinct msgids
splitMsg := utils.MakeMessage(message)
dispatchMessageToTarget(client, clientOnlyTags, histType, msg.Command, targetString, splitMsg, rb)
}
return false
}
func dispatchMessageToTarget(client *Client, tags map[string]string, histType history.ItemType, command, target string, message utils.SplitMessage, rb *ResponseBuffer) {
server := client.server
prefixes, target := modes.SplitChannelMembershipPrefixes(target)
lowestPrefix := modes.GetLowestChannelModePrefix(prefixes)
if len(target) == 0 {
return
} else if target[0] == '#' {
channel := server.channels.Get(target)
if channel == nil {
if histType != history.Notice {
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.Nick(), utils.SafeErrorParam(target), client.t("No such channel"))
}
return
}
channel.SendSplitMessage(command, lowestPrefix, tags, client, message, rb)
} else {
// NOTICE and TAGMSG to services are ignored
if histType == history.Privmsg {
lowercaseTarget := strings.ToLower(target)
if service, isService := OragonoServices[lowercaseTarget]; isService {
servicePrivmsgHandler(service, server, client, message.Message, rb)
return
} else if _, isZNC := zncHandlers[lowercaseTarget]; isZNC {
zncPrivmsgHandler(client, lowercaseTarget, message.Message, rb)
return
}
}
user := server.clients.Get(target)
if user == nil {
if histType != history.Notice {
rb.Add(nil, server.name, ERR_NOSUCHNICK, client.Nick(), target, "No such nick")
}
return
}
tDetails := user.Details()
tnick := tDetails.nick
details := client.Details()
nickMaskString := details.nickMask
accountName := details.accountName
var deliverySessions []*Session
// restrict messages appropriately when +R is set
// intentionally make the sending user think the message went through fine
allowedPlusR := details.account != "" || !user.HasMode(modes.RegisteredOnly)
if allowedPlusR {
deliverySessions = append(deliverySessions, user.Sessions()...)
}
// all sessions of the sender, except the originating session, get a copy as well:
if client != user {
for _, session := range client.Sessions() {
if session != rb.session {
deliverySessions = append(deliverySessions, session)
}
}
}
for _, session := range deliverySessions {
hasTagsCap := session.capabilities.Has(caps.MessageTags)
// don't send TAGMSG at all if they don't have the tags cap
if histType == history.Tagmsg && hasTagsCap {
session.sendFromClientInternal(false, message.Time, message.Msgid, nickMaskString, accountName, tags, command, tnick)
} else if histType != history.Tagmsg && !(session.isTor && message.IsRestrictedCTCPMessage()) {
tagsToSend := tags
if !hasTagsCap {
tagsToSend = nil
}
session.sendSplitMsgFromClientInternal(false, nickMaskString, accountName, tagsToSend, command, tnick, message)
}
}
// the originating session may get an echo message:
if rb.session.capabilities.Has(caps.EchoMessage) {
hasTagsCap := rb.session.capabilities.Has(caps.MessageTags)
if histType == history.Tagmsg && hasTagsCap {
rb.AddFromClient(message.Time, message.Msgid, nickMaskString, accountName, tags, command, tnick)
} else {
tagsToSend := tags
if !hasTagsCap {
tagsToSend = nil
}
rb.AddSplitMessageFromClient(nickMaskString, accountName, tagsToSend, command, tnick, message)
}
}
if histType != history.Notice && user.Away() {
//TODO(dan): possibly implement cooldown of away notifications to users
rb.Add(nil, server.name, RPL_AWAY, client.Nick(), tnick, user.AwayMessage())
}
config := server.Config()
if !config.History.Enabled {
return
}
item := history.Item{
Type: histType,
Message: message,
Nick: nickMaskString,
AccountName: accountName,
Tags: tags,
}
if !item.IsStorable() {
return
}
targetedItem := item
targetedItem.Params[0] = tnick
cStatus, _ := client.historyStatus(config)
tStatus, _ := user.historyStatus(config)
// add to ephemeral history
if cStatus == HistoryEphemeral {
targetedItem.CfCorrespondent = tDetails.nickCasefolded
client.history.Add(targetedItem)
}
if tStatus == HistoryEphemeral && client != user {
item.CfCorrespondent = details.nickCasefolded
user.history.Add(item)
}
if cStatus == HistoryPersistent || tStatus == HistoryPersistent {
targetedItem.CfCorrespondent = ""
server.historyDB.AddDirectMessage(details.nickCasefolded, details.account, tDetails.nickCasefolded, tDetails.account, targetedItem)
}
}
}
// NPC <target> <sourcenick> <message>
func npcHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
target := msg.Params[0]
fakeSource := msg.Params[1]
message := msg.Params[2:]
_, err := CasefoldName(fakeSource)
if err != nil {
client.Send(nil, client.server.name, ERR_CANNOTSENDRP, target, client.t("Fake source must be a valid nickname"))
return false
}
sourceString := fmt.Sprintf(npcNickMask, fakeSource, client.nick)
sendRoleplayMessage(server, client, sourceString, target, false, message, rb)
return false
}
// NPCA <target> <sourcenick> <message>
func npcaHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
target := msg.Params[0]
fakeSource := msg.Params[1]
message := msg.Params[2:]
sourceString := fmt.Sprintf(npcNickMask, fakeSource, client.nick)
_, err := CasefoldName(fakeSource)
if err != nil {
client.Send(nil, client.server.name, ERR_CANNOTSENDRP, target, client.t("Fake source must be a valid nickname"))
return false
}
sendRoleplayMessage(server, client, sourceString, target, true, message, rb)
return false
}
// OPER <name> [password]
func operHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
if client.HasMode(modes.Operator) {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, client.Nick(), "OPER", client.t("You're already opered-up!"))
return false
}
// must pass at least one check, and all enabled checks
var checkPassed, checkFailed, passwordFailed bool
oper := server.GetOperator(msg.Params[0])
if oper != nil {
if oper.Fingerprint != "" {
if oper.Fingerprint == rb.session.certfp {
checkPassed = true
} else {
checkFailed = true
}
}
if !checkFailed && oper.Pass != nil {
if len(msg.Params) == 1 {
checkFailed = true
} else if bcrypt.CompareHashAndPassword(oper.Pass, []byte(msg.Params[1])) != nil {
checkFailed = true
passwordFailed = true
} else {
checkPassed = true
}
}
}
if !checkPassed || checkFailed {
rb.Add(nil, server.name, ERR_PASSWDMISMATCH, client.Nick(), client.t("Password incorrect"))
// #951: only disconnect them if we actually tried to check a password for them
if passwordFailed {
client.Quit(client.t("Password incorrect"), rb.session)
return true
} else {
return false
}
}
if oper != nil {
applyOper(client, oper, rb)
}
return false
}
// adds or removes operator status
// XXX: to add oper, this calls into ApplyUserModeChanges, but to remove oper,
// ApplyUserModeChanges calls into this, because the commands are asymmetric
// (/OPER to add, /MODE self -o to remove)
func applyOper(client *Client, oper *Oper, rb *ResponseBuffer) {
details := client.Details()
client.SetOper(oper)
newDetails := client.Details()
if details.nickMask != newDetails.nickMask {
client.sendChghost(details.nickMask, newDetails.hostname)
}
if oper != nil {
// set new modes: modes.Operator, plus anything specified in the config
modeChanges := make([]modes.ModeChange, len(oper.Modes)+1)
modeChanges[0] = modes.ModeChange{
Mode: modes.Operator,
Op: modes.Add,
}
copy(modeChanges[1:], oper.Modes)
applied := ApplyUserModeChanges(client, modeChanges, true, oper)
client.server.snomasks.Send(sno.LocalOpers, fmt.Sprintf(ircfmt.Unescape("Client opered up $c[grey][$r%s$c[grey], $r%s$c[grey]]"), newDetails.nickMask, oper.Name))
rb.Broadcast(nil, client.server.name, RPL_YOUREOPER, details.nick, client.t("You are now an IRC operator"))
args := append([]string{details.nick}, applied.Strings()...)
rb.Broadcast(nil, client.server.name, "MODE", args...)
} else {
client.server.snomasks.Send(sno.LocalOpers, fmt.Sprintf(ircfmt.Unescape("Client deopered $c[grey][$r%s$c[grey]]"), newDetails.nickMask))
}
for _, session := range client.Sessions() {
// client may now be unthrottled by the fakelag system
session.resetFakelag()
}
}
// DEOPER
func deoperHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
// pretend they sent /MODE $nick -o
fakeModeMsg := ircmsg.MakeMessage(nil, "", "MODE", client.Nick(), "-o")
return umodeHandler(server, client, fakeModeMsg, rb)
}
// PART <channel>{,<channel>} [<reason>]
func partHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
channels := strings.Split(msg.Params[0], ",")
var reason string
if len(msg.Params) > 1 {
reason = msg.Params[1]
}
for _, chname := range channels {
if chname == "" {
continue // #679
}
err := server.channels.Part(client, chname, reason, rb)
if err == errNoSuchChannel {
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, utils.SafeErrorParam(chname), client.t("No such channel"))
}
}
return false
}
// PASS <password>
func passHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
if client.registered {
rb.Add(nil, server.name, ERR_ALREADYREGISTRED, client.nick, client.t("You may not reregister"))
return false
}
// if no password exists, skip checking
serverPassword := server.Config().Server.passwordBytes
if serverPassword == nil {
return false
}
// check the provided password
password := []byte(msg.Params[0])
rb.session.sentPassCommand = bcrypt.CompareHashAndPassword(serverPassword, password) == nil
// if they failed the check, we'll bounce them later when they try to complete registration
return false
}
// PING [params...]
func pingHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
rb.Add(nil, server.name, "PONG", msg.Params...)
return false
}
// PONG [params...]
func pongHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
// client gets touched when they send this command, so we don't need to do anything
return false
}
// QUIT [<reason>]
func quitHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
reason := "Quit"
if len(msg.Params) > 0 {
reason += ": " + msg.Params[0]
}
client.Quit(reason, rb.session)
return true
}
// REHASH
func rehashHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
server.logger.Info("server", fmt.Sprintf("REHASH command used by %s", client.nick))
err := server.rehash()
if err == nil {
rb.Add(nil, server.name, RPL_REHASHING, client.nick, "ircd.yaml", client.t("Rehashing"))
} else {
server.logger.Error("server", fmt.Sprintln("Failed to rehash:", err.Error()))
rb.Add(nil, server.name, ERR_UNKNOWNERROR, client.nick, "REHASH", err.Error())
}
return false
}
// RENAME <oldchan> <newchan> [<reason>]
func renameHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) (result bool) {
result = false
oldName, newName := msg.Params[0], msg.Params[1]
var reason string
if 2 < len(msg.Params) {
reason = msg.Params[2]
}
channel := server.channels.Get(oldName)
if channel == nil {
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.Nick(), utils.SafeErrorParam(oldName), client.t("No such channel"))
return false
}
if !(channel.ClientIsAtLeast(client, modes.ChannelOperator) || client.HasRoleCapabs("chanreg")) {
rb.Add(nil, server.name, ERR_CHANOPRIVSNEEDED, client.Nick(), oldName, client.t("You're not a channel operator"))
return false
}
founder := channel.Founder()
if founder != "" && founder != client.Account() {
rb.Add(nil, server.name, ERR_CANNOTRENAME, client.Nick(), oldName, newName, client.t("Only channel founders can change registered channels"))
return false
}
config := server.Config()
status, _ := channel.historyStatus(config)
if status == HistoryPersistent {
rb.Add(nil, server.name, ERR_CANNOTRENAME, client.Nick(), oldName, newName, client.t("Channels with persistent history cannot be renamed"))
return false
}
// perform the channel rename
err := server.channels.Rename(oldName, newName)
if err == errInvalidChannelName {
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.Nick(), utils.SafeErrorParam(newName), client.t(err.Error()))
} else if err == errChannelNameInUse {
rb.Add(nil, server.name, ERR_CHANNAMEINUSE, client.Nick(), utils.SafeErrorParam(newName), client.t(err.Error()))
} else if err != nil {
rb.Add(nil, server.name, ERR_CANNOTRENAME, client.Nick(), oldName, utils.SafeErrorParam(newName), client.t("Cannot rename channel"))
}
if err != nil {
return false
}
// send RENAME messages
clientPrefix := client.NickMaskString()
for _, mcl := range channel.Members() {
mDetails := mcl.Details()
for _, mSession := range mcl.Sessions() {
targetRb := rb
targetPrefix := clientPrefix
if mSession != rb.session {
targetRb = NewResponseBuffer(mSession)
targetPrefix = mDetails.nickMask
}
if mSession.capabilities.Has(caps.Rename) {
if reason != "" {
targetRb.Add(nil, clientPrefix, "RENAME", oldName, newName, reason)
} else {
targetRb.Add(nil, clientPrefix, "RENAME", oldName, newName)
}
} else {
if reason != "" {
targetRb.Add(nil, targetPrefix, "PART", oldName, fmt.Sprintf(mcl.t("Channel renamed: %s"), reason))
} else {
targetRb.Add(nil, targetPrefix, "PART", oldName, mcl.t("Channel renamed"))
}
if mSession.capabilities.Has(caps.ExtendedJoin) {
targetRb.Add(nil, targetPrefix, "JOIN", newName, mDetails.accountName, mDetails.realname)
} else {
targetRb.Add(nil, targetPrefix, "JOIN", newName)
}
channel.SendTopic(mcl, targetRb, false)
channel.Names(mcl, targetRb)
}
if mcl != client {
targetRb.Send(false)
}
}
}
return false
}
// RESUME <token> [timestamp]
func resumeHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
details := ResumeDetails{
PresentedToken: msg.Params[0],
}
if client.registered {
rb.Add(nil, server.name, "FAIL", "RESUME", "REGISTRATION_IS_COMPLETED", client.t("Cannot resume connection, connection registration has already been completed"))
return false
}
if 1 < len(msg.Params) {
ts, err := time.Parse(IRCv3TimestampFormat, msg.Params[1])
if err == nil {
details.Timestamp = ts
} else {
rb.Add(nil, server.name, "WARN", "RESUME", "HISTORY_LOST", client.t("Timestamp is not in 2006-01-02T15:04:05.999Z format, ignoring it"))
}
}
rb.session.resumeDetails = &details
return false
}
// SANICK <oldnick> <nickname>
func sanickHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
targetNick := strings.TrimSpace(msg.Params[0])
target := server.clients.Get(targetNick)
if target == nil {
rb.Add(nil, server.name, ERR_NOSUCHNICK, client.nick, msg.Params[0], client.t("No such nick"))
return false
}
performNickChange(server, client, target, nil, msg.Params[1], rb)
return false
}
// SCENE <target> <message>
func sceneHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
target := msg.Params[0]
message := msg.Params[1:]
sourceString := fmt.Sprintf(sceneNickMask, client.nick)
sendRoleplayMessage(server, client, sourceString, target, false, message, rb)
return false
}
// SETNAME <realname>
func setnameHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
realname := msg.Params[0]
client.SetRealname(realname)
details := client.Details()
// alert friends
now := time.Now().UTC()
for session := range client.Friends(caps.SetName) {
session.sendFromClientInternal(false, now, "", details.nickMask, details.account, nil, "SETNAME", details.realname)
}
return false
}
// TIME
func timeHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
rb.Add(nil, server.name, RPL_TIME, client.nick, server.name, time.Now().UTC().Format(time.RFC1123))
return false
}
// TOPIC <channel> [<topic>]
func topicHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
channel := server.channels.Get(msg.Params[0])
if channel == nil {
rb.Add(nil, server.name, ERR_NOSUCHCHANNEL, client.nick, utils.SafeErrorParam(msg.Params[0]), client.t("No such channel"))
return false
}
if len(msg.Params) > 1 {
channel.SetTopic(client, msg.Params[1], rb)
} else {
channel.SendTopic(client, rb, true)
}
return false
}
// UNDLINE <ip>|<net>
func unDLineHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
// check oper permissions
oper := client.Oper()
if oper == nil || !oper.Class.Capabilities.Has("local_unban") {
rb.Add(nil, server.name, ERR_NOPRIVS, client.nick, msg.Command, client.t("Insufficient oper privs"))
return false
}
// get host
hostString := msg.Params[0]
// check host
hostNet, err := utils.NormalizedNetFromString(hostString)
if err != nil {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, client.nick, msg.Command, client.t("Could not parse IP address or CIDR network"))
return false
}
err = server.dlines.RemoveNetwork(hostNet)
if err != nil {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, client.nick, msg.Command, fmt.Sprintf(client.t("Could not remove ban [%s]"), err.Error()))
return false
}
hostString = utils.NetToNormalizedString(hostNet)
rb.Notice(fmt.Sprintf(client.t("Removed D-Line for %s"), hostString))
server.snomasks.Send(sno.LocalXline, fmt.Sprintf(ircfmt.Unescape("%s$r removed D-Line for %s"), client.nick, hostString))
return false
}
// UNKLINE <mask>
func unKLineHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
details := client.Details()
// check oper permissions
oper := client.Oper()
if oper == nil || !oper.Class.Capabilities.Has("local_unban") {
rb.Add(nil, server.name, ERR_NOPRIVS, details.nick, msg.Command, client.t("Insufficient oper privs"))
return false
}
// get host
mask := msg.Params[0]
mask, err := CanonicalizeMaskWildcard(mask)
if err != nil {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, details.nick, msg.Command, client.t("Erroneous nickname"))
return false
}
err = server.klines.RemoveMask(mask)
if err != nil {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, details.nick, msg.Command, fmt.Sprintf(client.t("Could not remove ban [%s]"), err.Error()))
return false
}
rb.Notice(fmt.Sprintf(client.t("Removed K-Line for %s"), mask))
server.snomasks.Send(sno.LocalXline, fmt.Sprintf(ircfmt.Unescape("%s$r removed K-Line for %s"), details.nick, mask))
return false
}
// USER <username> * 0 <realname>
func userHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
if client.registered {
rb.Add(nil, server.name, ERR_ALREADYREGISTRED, client.Nick(), client.t("You may not reregister"))
return false
}
err := client.SetNames(msg.Params[0], msg.Params[3], false)
if err == errInvalidUsername {
// if client's using a unicode nick or something weird, let's just set 'em up with a stock username instead.
// fixes clients that just use their nick as a username so they can still use the interesting nick
if client.preregNick == msg.Params[0] {
client.SetNames("user", msg.Params[3], false)
} else {
rb.Add(nil, server.name, ERR_INVALIDUSERNAME, client.Nick(), client.t("Malformed username"))
}
}
return false
}
// USERHOST <nickname>{ <nickname>}
func userhostHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
returnedClients := make(ClientSet)
var tl utils.TokenLineBuilder
tl.Initialize(400, " ")
for i, nickname := range msg.Params {
if i >= 10 {
break
}
target := server.clients.Get(nickname)
if target == nil {
continue
}
// to prevent returning multiple results for a single nick
if returnedClients.Has(target) {
continue
}
returnedClients.Add(target)
var isOper, isAway string
if target.HasMode(modes.Operator) {
isOper = "*"
}
if target.Away() {
isAway = "-"
} else {
isAway = "+"
}
details := target.Details()
tl.Add(fmt.Sprintf("%s%s=%s%s@%s", details.nick, isOper, isAway, details.username, details.hostname))
}
lines := tl.Lines()
if lines == nil {
lines = []string{""}
}
nick := client.Nick()
for _, line := range lines {
rb.Add(nil, client.server.name, RPL_USERHOST, nick, line)
}
return false
}
// VERSION
func versionHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
rb.Add(nil, server.name, RPL_VERSION, client.nick, Ver, server.name)
server.RplISupport(client, rb)
return false
}
// WEBIRC <password> <gateway> <hostname> <ip> [:flag1 flag2=x flag3]
func webircHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
// only allow unregistered clients to use this command
if client.registered || client.proxiedIP != nil {
return false
}
// process flags
var secure bool
if 4 < len(msg.Params) {
for _, x := range strings.Split(msg.Params[4], " ") {
// split into key=value
var key string
if strings.Contains(x, "=") {
y := strings.SplitN(x, "=", 2)
key, _ = y[0], y[1]
} else {
key = x
}
lkey := strings.ToLower(key)
if lkey == "tls" || lkey == "secure" {
// only accept "tls" flag if the gateway's connection to us is secure as well
if client.HasMode(modes.TLS) || client.realIP.IsLoopback() {
secure = true
}
}
}
}
givenPassword := []byte(msg.Params[0])
for _, info := range server.Config().Server.WebIRC {
if utils.IPInNets(client.realIP, info.allowedNets) {
// confirm password and/or fingerprint
if 0 < len(info.Password) && bcrypt.CompareHashAndPassword(info.Password, givenPassword) != nil {
continue
}
if info.Fingerprint != "" && info.Fingerprint != rb.session.certfp {
continue
}
err, quitMsg := client.ApplyProxiedIP(rb.session, net.ParseIP(msg.Params[3]), secure)
if err != nil {
client.Quit(quitMsg, rb.session)
return true
} else {
return false
}
}
}
client.Quit(client.t("WEBIRC command is not usable from your address or incorrect password given"), rb.session)
return true
}
// WHO [<mask> [o]]
func whoHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
mask := msg.Params[0]
var err error
if mask == "" {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, client.nick, "WHO", client.t("First param must be a mask or channel"))
return false
} else if mask[0] == '#' {
mask, err = CasefoldChannel(msg.Params[0])
} else {
mask, err = CanonicalizeMaskWildcard(mask)
}
if err != nil {
rb.Add(nil, server.name, ERR_UNKNOWNERROR, client.Nick(), "WHO", client.t("Mask isn't valid"))
return false
}
//TODO(dan): is this used and would I put this param in the Modern doc?
// if not, can we remove it?
//var operatorOnly bool
//if len(msg.Params) > 1 && msg.Params[1] == "o" {
// operatorOnly = true
//}
isOper := client.HasMode(modes.Operator)
if mask[0] == '#' {
// TODO implement wildcard matching
//TODO(dan): ^ only for opers
channel := server.channels.Get(mask)
if channel != nil {
isJoined := channel.hasClient(client)
if !channel.flags.HasMode(modes.Secret) || isJoined || isOper {
for _, member := range channel.Members() {
if !member.HasMode(modes.Invisible) || isJoined || isOper {
client.rplWhoReply(channel, member, rb)
}
}
}
}
} else {
for mclient := range server.clients.FindAll(mask) {
client.rplWhoReply(nil, mclient, rb)
}
}
rb.Add(nil, server.name, RPL_ENDOFWHO, client.nick, mask, client.t("End of WHO list"))
return false
}
// WHOIS [<target>] <mask>{,<mask>}
func whoisHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
var masksString string
//var target string
if len(msg.Params) > 1 {
//target = msg.Params[0]
masksString = msg.Params[1]
} else {
masksString = msg.Params[0]
}
handleService := func(nick string) bool {
cfnick, _ := CasefoldName(nick)
service, ok := OragonoServices[cfnick]
if !ok {
return false
}
clientNick := client.Nick()
rb.Add(nil, client.server.name, RPL_WHOISUSER, clientNick, service.Name, service.Name, "localhost", "*", fmt.Sprintf(client.t("Network service, for more info /msg %s HELP"), service.Name))
// hehe
if client.HasMode(modes.TLS) {
rb.Add(nil, client.server.name, RPL_WHOISSECURE, clientNick, service.Name, client.t("is using a secure connection"))
}
return true
}
if client.HasMode(modes.Operator) {
for _, mask := range strings.Split(masksString, ",") {
matches := server.clients.FindAll(mask)
if len(matches) == 0 && !handleService(mask) {
rb.Add(nil, client.server.name, ERR_NOSUCHNICK, client.Nick(), utils.SafeErrorParam(mask), client.t("No such nick"))
continue
}
for mclient := range matches {
client.getWhoisOf(mclient, rb)
}
}
} else {
// only get the first request; also require a nick, not a mask
nick := strings.Split(masksString, ",")[0]
mclient := server.clients.Get(nick)
if mclient != nil {
client.getWhoisOf(mclient, rb)
} else if !handleService(nick) {
rb.Add(nil, client.server.name, ERR_NOSUCHNICK, client.Nick(), utils.SafeErrorParam(masksString), client.t("No such nick"))
}
// fall through, ENDOFWHOIS is always sent
}
rb.Add(nil, server.name, RPL_ENDOFWHOIS, client.nick, utils.SafeErrorParam(masksString), client.t("End of /WHOIS list"))
return false
}
// WHOWAS <nickname> [<count> [<server>]]
func whowasHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
nicknames := strings.Split(msg.Params[0], ",")
// 0 means "all the entries", as does a negative number
var count int
if len(msg.Params) > 1 {
count, _ = strconv.Atoi(msg.Params[1])
if count < 0 {
count = 0
}
}
//var target string
//if len(msg.Params) > 2 {
// target = msg.Params[2]
//}
cnick := client.Nick()
for _, nickname := range nicknames {
if len(nickname) == 0 {
continue
}
results := server.whoWas.Find(nickname, count)
if len(results) == 0 {
rb.Add(nil, server.name, ERR_WASNOSUCHNICK, cnick, utils.SafeErrorParam(nickname), client.t("There was no such nickname"))
} else {
for _, whoWas := range results {
rb.Add(nil, server.name, RPL_WHOWASUSER, cnick, whoWas.nick, whoWas.username, whoWas.hostname, "*", whoWas.realname)
}
}
rb.Add(nil, server.name, RPL_ENDOFWHOWAS, cnick, utils.SafeErrorParam(nickname), client.t("End of WHOWAS"))
}
return false
}
// ZNC <module> [params]
func zncHandler(server *Server, client *Client, msg ircmsg.IrcMessage, rb *ResponseBuffer) bool {
zncModuleHandler(client, msg.Params[0], msg.Params[1:], rb)
return false
}
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