From 02032ae28204264e6b7e161bac9cfd3042bab307 Mon Sep 17 00:00:00 2001
From: Attila Molnar <attilamolnar@hush.com>
Date: Fri, 20 Jun 2014 16:34:03 +0200
Subject: [PATCH] Check Q-Lines on nick change in core_xline

---
 src/coremods/core_xline/core_xline.cpp | 21 +++++++++++++++++++++
 src/users.cpp                          | 25 +------------------------
 2 files changed, 22 insertions(+), 24 deletions(-)

diff --git a/src/coremods/core_xline/core_xline.cpp b/src/coremods/core_xline/core_xline.cpp
index 7daa70b49..7fa7da019 100644
--- a/src/coremods/core_xline/core_xline.cpp
+++ b/src/coremods/core_xline/core_xline.cpp
@@ -18,6 +18,7 @@
 
 
 #include "inspircd.h"
+#include "xline.h"
 #include "core_xline.h"
 
 bool InsaneBan::MatchesEveryone(const std::string& mask, MatcherBase& test, User* user, const char* bantype, const char* confkey)
@@ -63,6 +64,26 @@ class CoreModXLine : public Module
 	{
 	}
 
+	ModResult OnUserPreNick(LocalUser* user, const std::string& newnick) CXX11_OVERRIDE
+	{
+		// Check Q-Lines (for local nick changes only, remote servers have our Q-Lines to enforce themselves)
+
+		XLine* xline = ServerInstance->XLines->MatchesLine("Q", newnick);
+		if (!xline)
+			return MOD_RES_PASSTHRU; // No match
+
+		// A Q-Line matched the new nick, tell opers if the user is registered
+		if (user->registered == REG_ALL)
+		{
+			ServerInstance->SNO->WriteGlobalSno('a', "Q-Lined nickname %s from %s: %s",
+				newnick.c_str(), user->GetFullRealHost().c_str(), xline->reason.c_str());
+		}
+
+		// Send a numeric because if we deny then the core doesn't reply anything
+		user->WriteNumeric(ERR_ERRONEUSNICKNAME, "%s :Invalid nickname: %s", newnick.c_str(), xline->reason.c_str());
+		return MOD_RES_DENY;
+	}
+
 	Version GetVersion() CXX11_OVERRIDE
 	{
 		return Version("Provides the ELINE, GLINE, KLINE, QLINE, and ZLINE commands", VF_VENDOR|VF_CORE);
diff --git a/src/users.cpp b/src/users.cpp
index 87e40a53e..75852330f 100644
--- a/src/users.cpp
+++ b/src/users.cpp
@@ -647,7 +647,7 @@ bool User::ChangeNick(const std::string& newnick, bool force, time_t newts)
 
 	if (assign(newnick) == assign(nick))
 	{
-		// case change, don't need to check Q:lines and such
+		// case change, don't need to check campers
 		// and, if it's identical including case, we can leave right now
 		// We also don't update the nick TS if it's a case change, either
 		if (newnick == nick)
@@ -655,29 +655,6 @@ bool User::ChangeNick(const std::string& newnick, bool force, time_t newts)
 	}
 	else
 	{
-		/*
-		 * Don't check Q:Lines if it's a server-enforced change, just on the off-chance some fucking *moron*
-		 * tries to Q:Line SIDs, also, this means we just get our way period, as it really should be.
-		 * Thanks Kein for finding this. -- w00t
-		 *
-		 * Also don't check Q:Lines for remote nickchanges, they should have our Q:Lines anyway to enforce themselves.
-		 *		-- w00t
-		 */
-		if (IS_LOCAL(this) && !force)
-		{
-			XLine* mq = ServerInstance->XLines->MatchesLine("Q",newnick);
-			if (mq)
-			{
-				if (this->registered == REG_ALL)
-				{
-					ServerInstance->SNO->WriteGlobalSno('a', "Q-Lined nickname %s from %s: %s",
-						newnick.c_str(), GetFullRealHost().c_str(), mq->reason.c_str());
-				}
-				this->WriteNumeric(ERR_ERRONEUSNICKNAME, "%s :Invalid nickname: %s", newnick.c_str(), mq->reason.c_str());
-				return false;
-			}
-		}
-
 		/*
 		 * Uh oh.. if the nickname is in use, and it's not in use by the person using it (doh) --
 		 * then we have a potential collide. Check whether someone else is camping on the nick
-- 
2.39.5