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- // Copyright (c) 2012-2014 Jeremy Latt
- // Copyright (c) 2016-2017 Daniel Oaks <daniel@danieloaks.net>
- // released under the MIT license
-
- package irc
-
- import (
- "crypto/rand"
- "fmt"
- "strings"
-
- "github.com/ergochat/ergo/irc/history"
- "github.com/ergochat/ergo/irc/modes"
- "github.com/ergochat/ergo/irc/sno"
- "github.com/ergochat/ergo/irc/utils"
- "github.com/ergochat/irc-go/ircfmt"
- )
-
- var (
- restrictedNicknames = []string{
- "=scene=", // used for rp commands
- "Global", // global announcements on some networks
- // common services not implemented by us:
- "MemoServ", "BotServ", "OperServ",
- }
-
- restrictedCasefoldedNicks = make(utils.StringSet)
- restrictedSkeletons = make(utils.StringSet)
- )
-
- func performNickChange(server *Server, client *Client, target *Client, session *Session, nickname string, rb *ResponseBuffer) error {
- details := target.Details()
- hadNick := details.nick != "*"
- origNickMask := details.nickMask
- isSanick := client != target
-
- assignedNickname, err, back := client.server.clients.SetNick(target, session, nickname, false)
- if err == errNicknameInUse {
- if !isSanick {
- rb.Add(nil, server.name, ERR_NICKNAMEINUSE, details.nick, utils.SafeErrorParam(nickname), client.t("Nickname is already in use"))
- } else {
- rb.Add(nil, server.name, "FAIL", "SANICK", "NICKNAME_IN_USE", utils.SafeErrorParam(nickname), client.t("Nickname is already in use"))
- }
- } else if err == errNicknameReserved {
- if !isSanick {
- if !client.registered {
- rb.Add(nil, server.name, ERR_NICKNAMEINUSE, details.nick, utils.SafeErrorParam(nickname), client.t("Nickname is reserved by a different account"))
- }
- rb.Add(nil, server.name, "FAIL", "NICK", "NICKNAME_RESERVED", utils.SafeErrorParam(nickname), client.t("Nickname is reserved by a different account"))
- } else {
- rb.Add(nil, server.name, "FAIL", "SANICK", "NICKNAME_RESERVED", utils.SafeErrorParam(nickname), client.t("Nickname is reserved by a different account"))
- }
- } else if err == errNicknameInvalid {
- if !isSanick {
- rb.Add(nil, server.name, ERR_ERRONEUSNICKNAME, details.nick, utils.SafeErrorParam(nickname), client.t("Erroneous nickname"))
- } else {
- rb.Add(nil, server.name, "FAIL", "SANICK", "NICKNAME_INVALID", utils.SafeErrorParam(nickname), client.t("Erroneous nickname"))
- }
- } else if err == errNickAccountMismatch {
- // this used to use ERR_NICKNAMEINUSE, but it displayed poorly in some clients;
- // ERR_UNKNOWNERROR at least has a better chance of displaying our error text
- if !isSanick {
- rb.Add(nil, server.name, ERR_UNKNOWNERROR, details.nick, "NICK", client.t("You must use your account name as your nickname"))
- } else {
- rb.Add(nil, server.name, "FAIL", "SANICK", "UNKNOWN_ERROR", utils.SafeErrorParam(nickname), client.t("This user's nickname and account name need to be equal"))
- }
- } else if err == errNickMissing {
- if !isSanick {
- rb.Add(nil, server.name, ERR_NONICKNAMEGIVEN, details.nick, client.t("No nickname given"))
- } else {
- rb.Add(nil, server.name, "FAIL", "SANICK", "NICKNAME_INVALID", utils.SafeErrorParam(nickname), client.t("No nickname given"))
- }
- } else if err == errNoop {
- if !isSanick {
- // no message
- } else {
- rb.Add(nil, server.name, "NOTE", "SANICK", "NOOP", utils.SafeErrorParam(nickname), client.t("Client already had the desired nickname"))
- }
- } else if err != nil {
- client.server.logger.Error("internal", "couldn't change nick", nickname, err.Error())
- if !isSanick {
- rb.Add(nil, server.name, ERR_UNKNOWNERROR, details.nick, "NICK", client.t("Could not set or change nickname"))
- } else {
- rb.Add(nil, server.name, "FAIL", "SANICK", "UNKNOWN_ERROR", utils.SafeErrorParam(nickname), client.t("Could not set or change nickname"))
- }
- }
- if err != nil {
- return err
- }
-
- isBot := !isSanick && client.HasMode(modes.Bot)
- message := utils.MakeMessage("")
- histItem := history.Item{
- Type: history.Nick,
- Nick: origNickMask,
- AccountName: details.accountName,
- Message: message,
- IsBot: isBot,
- }
- histItem.Params[0] = assignedNickname
-
- client.server.logger.Debug("nick", fmt.Sprintf("%s changed nickname to %s [%s]", origNickMask, assignedNickname, client.NickCasefolded()))
- if hadNick {
- if client == target {
- target.server.snomasks.Send(sno.LocalNicks, fmt.Sprintf(ircfmt.Unescape("$%s$r changed nickname to %s"), details.nick, assignedNickname))
- } else {
- target.server.snomasks.Send(sno.LocalNicks, fmt.Sprintf(ircfmt.Unescape("Operator %s changed nickname of $%s$r to %s"), client.Nick(), details.nick, assignedNickname))
- }
- target.server.whoWas.Append(details.WhoWas)
- rb.AddFromClient(message.Time, message.Msgid, origNickMask, details.accountName, isBot, nil, "NICK", assignedNickname)
- for session := range target.Friends() {
- if session != rb.session {
- session.sendFromClientInternal(false, message.Time, message.Msgid, origNickMask, details.accountName, isBot, nil, "NICK", assignedNickname)
- }
- }
- }
-
- if back {
- dispatchAwayNotify(session.client, false, "")
- }
-
- for _, channel := range target.Channels() {
- channel.AddHistoryItem(histItem, details.account)
- }
-
- newCfnick := target.NickCasefolded()
- if newCfnick != details.nickCasefolded {
- client.server.monitorManager.AlertAbout(details.nick, details.nickCasefolded, false)
- client.server.monitorManager.AlertAbout(assignedNickname, newCfnick, true)
- }
- return nil
- }
-
- func (server *Server) RandomlyRename(client *Client) {
- format := server.Config().Accounts.NickReservation.GuestFormat
- buf := make([]byte, 8)
- rand.Read(buf)
- nick := strings.Replace(format, "*", utils.B32Encoder.EncodeToString(buf), -1)
- sessions := client.Sessions()
- if len(sessions) == 0 {
- // this can happen if they are anonymous and BRB (in general, an always-on
- // client has title to its nickname and will never be the victim of
- // a call to RandomlyRename)
- client.destroy(nil)
- return
- }
- // XXX arbitrarily pick the first session to receive error messages;
- // all other sessions receive a `NICK` line same as a friend would
- rb := NewResponseBuffer(sessions[0])
- performNickChange(server, client, client, nil, nick, rb)
- rb.Send(false)
- // technically performNickChange can fail to change the nick,
- // but if they're still delinquent, the timer will get them later
- }
-
- // if force-nick-equals-account is set, account name and nickname must be equal,
- // so we need to re-NICK automatically on every login event (IDENTIFY,
- // VERIFY, and a REGISTER that auto-verifies). if we can't get the nick
- // then we log them out (they will be able to reattach with SASL)
- func fixupNickEqualsAccount(client *Client, rb *ResponseBuffer, config *Config, source string) (success bool) {
- if !config.Accounts.NickReservation.ForceNickEqualsAccount {
- return true
- }
- if !client.registered {
- return true
- }
- err := performNickChange(client.server, client, client, rb.session, client.AccountName(), rb)
- if err != nil && err != errNoop {
- client.server.accounts.Logout(client)
- if source == "" {
- source = client.server.name
- }
- rb.Add(nil, source, "NOTICE", client.t("A client is already using that account; try logging out and logging back in with SASL"))
- return false
- }
- return true
- }
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