From 889d521e05f2e922683d48c74eb00290e7a2f548 Mon Sep 17 00:00:00 2001
From: Sadie Powell
Date: Wed, 17 Jul 2024 00:06:50 +0100
Subject: Shuffle the modules about a bit.

---
 modules/spanningtree/nick.cpp | 59 +++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 59 insertions(+)
 create mode 100644 modules/spanningtree/nick.cpp

(limited to 'modules/spanningtree/nick.cpp')

diff --git a/modules/spanningtree/nick.cpp b/modules/spanningtree/nick.cpp
new file mode 100644
index 000000000..7a54f0b80
--- /dev/null
+++ b/modules/spanningtree/nick.cpp
@@ -0,0 +1,59 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2018, 2020, 2022-2023 Sadie Powell <sadie@witchery.services>
+ *   Copyright (C) 2013-2014 Attila Molnar <attilamolnar@hush.com>
+ *
+ * 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 "utils.h"
+#include "commands.h"
+#include "treeserver.h"
+
+CmdResult CommandNick::HandleRemote(::RemoteUser* user, Params& params)
+{
+	if ((isdigit(params[0][0])) && (params[0] != user->uuid))
+		throw ProtocolException("Attempted to change nick to an invalid or non-matching UUID");
+
+	// Timestamp of the new nick
+	time_t newts = ServerCommand::ExtractTS(params[1]);
+
+	/*
+	 * On nick messages, check that the nick doesn't already exist here.
+	 * If it does, perform collision logic.
+	 */
+	auto* x = ServerInstance->Users.FindNick(params[0], true);
+	if (x && x != user)
+	{
+		// 'x' is the already existing user using the same nick as params[0]
+		// 'user' is the user trying to change nick to the in use nick
+		bool they_change = SpanningTreeUtilities::DoCollision(x, TreeServer::Get(user), newts, user->GetRealUser(), user->GetAddress(), user->uuid, "NICK");
+		if (they_change)
+		{
+			// Remote client lost, or both lost, rewrite this nick change as a change to uuid before
+			// calling ChangeNick() and forwarding the message
+			params[0] = user->uuid;
+			params[1] = ConvToStr(CommandSave::SavedTimestamp);
+			newts = CommandSave::SavedTimestamp;
+		}
+	}
+
+	user->ChangeNick(params[0], newts);
+
+	return CmdResult::SUCCESS;
+}
-- 
cgit v1.3.1-10-gc9f91