+/*
+ * InspIRCd -- Internet Relay Chat Daemon
+ *
+ * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
+ * Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
+ * Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
+ * Copyright (C) 2005 Craig Edwards <craigedwards@brainbox.cc>
+ *
+ * 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"
+
+/* $ModDesc: Implements config tags which allow blocking of joins to channels */
+
+class ModuleDenyChannels : public Module
+{
+ public:
+ void init()
+ {
+ Implementation eventlist[] = { I_OnUserPreJoin, I_OnRehash };
+ ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
+ }
+
+ virtual void OnRehash(User* user)
+ {
+ /* check for redirect validity and loops/chains */
+ ConfigTagList tags = ServerInstance->Config->ConfTags("badchan");
+ for (ConfigIter i = tags.first; i != tags.second; ++i)
+ {
+ std::string name = i->second->getString("name");
+ std::string redirect = i->second->getString("redirect");
+
+ if (!redirect.empty())
+ {
+
+ if (!ServerInstance->IsChannel(redirect.c_str(), ServerInstance->Config->Limits.ChanMax))
+ {
+ if (user)
+ user->WriteServ("NOTICE %s :Invalid badchan redirect '%s'", user->nick.c_str(), redirect.c_str());
+ throw ModuleException("Invalid badchan redirect, not a channel");
+ }
+
+ for (ConfigIter j = tags.first; j != tags.second; ++j)
+ {
+ if (InspIRCd::Match(redirect, j->second->getString("name")))
+ {
+ bool goodchan = false;
+ ConfigTagList goodchans = ServerInstance->Config->ConfTags("badchan");
+ for (ConfigIter k = goodchans.first; k != goodchans.second; ++k)
+ {
+ if (InspIRCd::Match(redirect, k->second->getString("name")))
+ goodchan = true;
+ }
+
+ if (!goodchan)
+ {
+ /* <badchan:redirect> is a badchan */
+ if (user)
+ user->WriteServ("NOTICE %s :Badchan %s redirects to badchan %s", user->nick.c_str(), name.c_str(), redirect.c_str());
+ throw ModuleException("Badchan redirect loop");
+ }
+ }
+ }
+ }
+ }
+ }
+
+ virtual ~ModuleDenyChannels()
+ {
+ }
+
+ virtual Version GetVersion()
+ {
+ return Version("Implements config tags which allow blocking of joins to channels", VF_VENDOR);
+ }
+
+
+ virtual ModResult OnUserPreJoin(User* user, Channel* chan, const char* cname, std::string &privs, const std::string &keygiven)
+ {
+ ConfigTagList tags = ServerInstance->Config->ConfTags("badchan");
+ for (ConfigIter j = tags.first; j != tags.second; ++j)
+ {
+ if (InspIRCd::Match(cname, j->second->getString("name")))
+ {
+ if (IS_OPER(user) && j->second->getBool("allowopers"))
+ {
+ return MOD_RES_PASSTHRU;
+ }
+ else
+ {
+ std::string reason = j->second->getString("reason");
+ std::string redirect = j->second->getString("redirect");
+
+ ConfigTagList goodchans = ServerInstance->Config->ConfTags("goodchan");
+ for (ConfigIter i = goodchans.first; i != goodchans.second; ++i)
+ {
+ if (InspIRCd::Match(cname, i->second->getString("name")))
+ {
+ return MOD_RES_PASSTHRU;
+ }
+ }
+
+ if (ServerInstance->IsChannel(redirect.c_str(), ServerInstance->Config->Limits.ChanMax))
+ {
+ /* simple way to avoid potential loops: don't redirect to +L channels */
+ Channel *newchan = ServerInstance->FindChan(redirect);
+ if ((!newchan) || (!(newchan->IsModeSet('L'))))
+ {
+ user->WriteNumeric(926, "%s %s :Channel %s is forbidden, redirecting to %s: %s",user->nick.c_str(),cname,cname,redirect.c_str(), reason.c_str());
+ Channel::JoinUser(user,redirect.c_str(),false,"",false,ServerInstance->Time());
+ return MOD_RES_DENY;
+ }
+ }
+
+ user->WriteNumeric(926, "%s %s :Channel %s is forbidden: %s",user->nick.c_str(),cname,cname,reason.c_str());
+ return MOD_RES_DENY;
+ }
+ }
+ }
+ return MOD_RES_PASSTHRU;
+ }
+};
+
+MODULE_INIT(ModuleDenyChannels)