Merge pull request #133 from nenolod/feature/mlock-2.1

serverside MLOCK for inspircd 2.1

docs/modules.conf.example

@@ -999,6 +999,12 @@
 # Msg flood module: Adds message/notice flood protection (+f)
 #<module name="m_messageflood.so">
 
+#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#
+# MLOCK module: Adds support for server-side enforcement of services
+# side MLOCKs.  Basically, this module suppresses any mode change that
+# would likely be immediately bounced by services.
+#<module name="m_mlock.so">
+
 #-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#-#
 # MySQL module: Allows other SQL modules to access MySQL databases
 # through a unified API. 

src/modules/m_mlock.cpp

@@ -0,0 +1,76 @@
+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ *   Copyright (C) 2012 William Pitcock <nenolod@dereferenced.org>
+ *
+ * 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"
+
+class ModuleMLock : public Module
+{
+private:
+	StringExtItem mlock;
+
+public:
+	ModuleMLock() : mlock(EXTENSIBLE_CHANNEL, "mlock", this) {};
+
+	void init()
+	{
+		ServerInstance->Modules->Attach(I_OnPreMode, this);
+	}
+
+	Version GetVersion()
+	{
+		return Version("Implements the ability to have server-side MLOCK enforcement.", VF_VENDOR);
+	}
+
+	void Prioritize()
+	{
+		ServerInstance->Modules->SetPriority(this, I_OnPreMode, PRIORITY_FIRST);
+	}
+
+	ModResult OnPreMode(User* source, Extensible *e, irc::modestacker &ms)
+	{
+		Channel *ch = dynamic_cast<Channel *>(e);
+
+		if (!ch)
+			return MOD_RES_PASSTHRU;
+
+		if (!IS_LOCAL(source))
+			return MOD_RES_PASSTHRU;
+
+		std::string *mlock_str = mlock.get(e);
+		if (!mlock_str || mlock_str->empty())
+			return MOD_RES_PASSTHRU;
+
+		for(std::vector<irc::modechange>::iterator iter = ms.sequence.begin(); iter != ms.sequence.end(); ++iter)
+		{
+			ModeHandler *mh = ServerInstance->Modes->FindMode(iter->mode);
+			char modechar = mh->GetModeChar();
+
+			if (mlock_str->find(modechar))
+			{
+				source->WriteNumeric(742, "%s %c %s :MODE cannot be set due to channel having an active MLOCK restriction policy",
+						     ch->name.c_str(), modechar, mlock_str->c_str());
+				return MOD_RES_DENY;
+			}
+		}
+
+		return MOD_RES_PASSTHRU;
+	}
+
+};
+
+MODULE_INIT(ModuleMLock)