X-Git-Url: https://git.netwichtig.de/gitweb/?a=blobdiff_plain;f=src%2Fmodules%2Fm_spanningtree%2Fsvsnick.cpp;h=d66a6b6598d5573e9c091b0787e785e252b5de45;hb=80e81e3b81b779901fd9d67f8ae030ee30c0bcec;hp=43fa0f296ec6cb5811a9cd69a56b1e3e77c56720;hpb=a8b146419b2aae36da25b7202292528efd3158a9;p=user%2Fhenk%2Fcode%2Finspircd.git

diff --git a/src/modules/m_spanningtree/svsnick.cpp b/src/modules/m_spanningtree/svsnick.cpp
index 43fa0f296..d66a6b659 100644
--- a/src/modules/m_spanningtree/svsnick.cpp
+++ b/src/modules/m_spanningtree/svsnick.cpp
@@ -1,7 +1,11 @@
 /*
  * InspIRCd -- Internet Relay Chat Daemon
  *
- *   Copyright (C) 2010 Daniel De Graaf <danieldg@inspircd.org>
+ *   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
@@ -23,37 +27,55 @@
 #include "main.h"
 #include "commands.h"
 
-CmdResult CommandSVSNick::Handle(User* user, std::vector<std::string>& parameters)
+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 = ConvToInt(parameters[2]);
+		time_t NickTS = ConvToNum<time_t>(parameters[2]);
 		if (NickTS <= 0)
 			return CMD_FAILURE;
 
-		if (!u->ForceNickChange(nick, NickTS))
+		if (!u->ChangeNick(nick, NickTS))
 		{
-			/* buh. UID them */
-			if (!u->ForceNickChange(u->uuid))
-			{
-				ServerInstance->Users->QuitUser(u, "Nickname collision");
-			}
+			// 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 std::vector<std::string>& parameters)
+RouteDescriptor CommandSVSNick::GetRouting(User* user, const Params& parameters)
 {
-	User* u = ServerInstance->FindNick(parameters[0]);
-	if (u)
-		return ROUTE_OPT_UCAST(u->server);
-	return ROUTE_LOCALONLY;
+	return ROUTE_OPT_UCAST(parameters[0]);
 }