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/*
* InspIRCd -- Internet Relay Chat Daemon
*
* Copyright (C) 2018-2020 Sadie Powell <sadie@witchery.services>
* Copyright (C) 2013-2016 Attila Molnar <attilamolnar@hush.com>
* Copyright (C) 2012 Robby <robby@chatbelgie.be>
* Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
* Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
* Copyright (C) 2008 Robin Burchell <robin+git@viroteck.net>
*
* This file is part of InspIRCd. InspIRCd is free software: you can
* redistribute it and/or modify it under the terms of the GNU General Public
* License as published by the Free Software Foundation, version 2.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
* FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
* details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "inspircd.h"
#include "main.h"
#include "commands.h"
CmdResult CommandSVSNick::Handle(User* user, Params& parameters)
{
User* u = ServerInstance->FindNick(parameters[0]);
if (u && IS_LOCAL(u))
{
// The 4th parameter is optional and it is the expected nick TS of the target user. If this parameter is
// present and it doesn't match the user's nick TS, the SVSNICK is not acted upon.
// This makes it possible to detect the case when services wants to change the nick of a user, but the
// user changes their nick before the SVSNICK arrives, making the SVSNICK nick change (usually to a guest nick)
// unnecessary. Consider the following for example:
//
// 1. test changes nick to Attila which is protected by services
// 2. Services SVSNICKs the user to Guest12345
// 3. Attila changes nick to Attila_ which isn't protected by services
// 4. SVSNICK arrives
// 5. Attila_ gets his nick changed to Guest12345 unnecessarily
//
// In this case when the SVSNICK is processed the target has already changed their nick to something
// which isn't protected, so changing the nick again to a Guest nick is not desired.
// However, if the expected nick TS parameter is present in the SVSNICK then the nick change in step 5
// won't happen because the timestamps won't match.
if (parameters.size() > 3)
{
time_t ExpectedTS = ConvToNum<time_t>(parameters[3]);
if (u->age != ExpectedTS)
return CMD_FAILURE; // Ignore SVSNICK
}
std::string nick = parameters[1];
if (isdigit(nick[0]))
nick = u->uuid;
time_t NickTS = ConvToNum<time_t>(parameters[2]);
if (NickTS <= 0)
return CMD_FAILURE;
if (!u->ChangeNick(nick, NickTS))
{
// Changing to 'nick' failed (it may already be in use), change to the uuid
u->WriteNumeric(RPL_SAVENICK, u->uuid, "Your nickname is in use by an older user on a new server.");
u->ChangeNick(u->uuid);
}
}
return CMD_SUCCESS;
}
RouteDescriptor CommandSVSNick::GetRouting(User* user, const Params& parameters)
{
return ROUTE_OPT_UCAST(parameters[0]);
}
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