Send RPL_SAVENICK from irc2 when renaming a user to their UUID.

[user/henk/code/inspircd.git] / src / modules / m_spanningtree / svsnick.cpp

diff --git a/src/modules/m_spanningtree/svsnick.cpp b/src/modules/m_spanningtree/svsnick.cpp
index 14e078710e82a56ee3a9f8fb33d4d416648196b2..8d1bc80ba20cb2dd4a04c6ba7c0024c20fab4b4d 100644 (file)
--- a/src/modules/m_spanningtree/svsnick.cpp
+++ b/src/modules/m_spanningtree/svsnick.cpp
@@ -1,64 +1,81 @@
-/*       +------------------------------------+
- *       | Inspire Internet Relay Chat Daemon |
- *       +------------------------------------+
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
  *
- *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
- * See: http://wiki.inspircd.org/Credits
+ *   Copyright (C) 2018-2019 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 program is free but copyrighted software; see
- *            the file COPYING for details.
+ * 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 "commands/cmd_whois.h"
-#include "commands/cmd_stats.h"
-#include "socket.h"
-#include "xline.h"
-#include "transport.h"
-#include "socketengine.h"
 
-#include "m_spanningtree/main.h"
-#include "m_spanningtree/utils.h"
-#include "m_spanningtree/treeserver.h"
-#include "m_spanningtree/treesocket.h"
+#include "inspircd.h"
 
-/* $ModDep: m_spanningtree/main.h m_spanningtree/utils.h m_spanningtree/treeserver.h m_spanningtree/treesocket.h */
+#include "main.h"
+#include "commands.h"
 
-/** Because Andy insists that services-compatible servers must
- * implement SVSNICK and SVSJOIN, that's exactly what we do :p
- */
-bool TreeSocket::ForceNick(const std::string &prefix, std::deque<std::string> &params)
+CmdResult CommandSVSNick::Handle(User* user, Params& parameters)
 {
-       if (params.size() < 3)
-               return true;
-
-       User* u = this->ServerInstance->FindNick(params[0]);
+       User* u = ServerInstance->FindNick(parameters[0]);
 
-       if (u)
+       if (u && IS_LOCAL(u))
        {
-               Utils->DoOneToAllButSender(prefix,"SVSNICK",params,prefix);
-
-               if (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)
                {
-                       std::deque<std::string> par;
-                       par.push_back(params[1]);
+                       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;
 
-                       if (!u->ForceNickChange(params[1].c_str()))
-                       {
-                               /* buh. UID them */
-                               if (!u->ForceNickChange(u->uuid.c_str()))
-                               {
-                                       this->ServerInstance->Users->QuitUser(u, "Nickname collision");
-                                       return true;
-                               }
-                       }
+               time_t NickTS = ConvToNum<time_t>(parameters[2]);
+               if (NickTS <= 0)
+                       return CMD_FAILURE;
 
-                       u->age = atoi(params[2].c_str());
+               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 true;
+       return CMD_SUCCESS;
 }
 
+RouteDescriptor CommandSVSNick::GetRouting(User* user, const Params& parameters)
+{
+       return ROUTE_OPT_UCAST(parameters[0]);
+}