src/modules/m_denychans.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
   6  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   7  *   Copyright (C) 2005 Craig Edwards <craigedwards@brainbox.cc>
   8  *
   9  * This file is part of InspIRCd.  InspIRCd is free software: you can
  10  * redistribute it and/or modify it under the terms of the GNU General Public
  11  * License as published by the Free Software Foundation, version 2.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22
  23 #include "inspircd.h"
  24
  25 /* $ModDesc: Implements config tags which allow blocking of joins to channels */
  26
  27 class ModuleDenyChannels : public Module
  28 {
  29  public:
  30         ModuleDenyChannels()    {
  31                 Implementation eventlist[] = { I_OnUserPreJoin, I_OnRehash };
  32                 ServerInstance->Modules->Attach(eventlist, this, 2);
  33         }
  34
  35         virtual void OnRehash(User* user)
  36         {
  37                 /* check for redirect validity and loops/chains */
  38                 ConfigTagList tags = ServerInstance->Config->ConfTags("badchan");
  39                 for (ConfigIter i = tags.first; i != tags.second; ++i)
  40                 {
  41                         std::string name = i->second->getString("name");
  42                         std::string redirect = i->second->getString("redirect");
  43
  44                         if (!redirect.empty())
  45                         {
  46
  47                                 if (!ServerInstance->IsChannel(redirect.c_str(), ServerInstance->Config->Limits.ChanMax))
  48                                 {
  49                                         if (user)
  50                                                 user->WriteServ("NOTICE %s :Invalid badchan redirect '%s'", user->nick.c_str(), redirect.c_str());
  51                                         throw ModuleException("Invalid badchan redirect, not a channel");
  52                                 }
  53
  54                                 for (ConfigIter j = tags.first; j != tags.second; ++j)
  55                                 {
  56                                         if (InspIRCd::Match(redirect, j->second->getString("name")))
  57                                         {
  58                                                 bool goodchan = false;
  59                                                 ConfigTagList goodchans = ServerInstance->Config->ConfTags("badchan");
  60                                                 for (ConfigIter k = goodchans.first; k != goodchans.second; ++k)
  61                                                 {
  62                                                         if (InspIRCd::Match(redirect, k->second->getString("name")))
  63                                                                 goodchan = true;
  64                                                 }
  65
  66                                                 if (!goodchan)
  67                                                 {
  68                                                         /* <badchan:redirect> is a badchan */
  69                                                         if (user)
  70                                                                 user->WriteServ("NOTICE %s :Badchan %s redirects to badchan %s", user->nick.c_str(), name.c_str(), redirect.c_str());
  71                                                         throw ModuleException("Badchan redirect loop");
  72                                                 }
  73                                         }
  74                                 }
  75                         }
  76                 }
  77         }
  78
  79         virtual ~ModuleDenyChannels()
  80         {
  81         }
  82
  83         virtual Version GetVersion()
  84         {
  85                 return Version("Implements config tags which allow blocking of joins to channels", VF_VENDOR);
  86         }
  87
  88
  89         virtual ModResult OnUserPreJoin(User* user, Channel* chan, const char* cname, std::string &privs, const std::string &keygiven)
  90         {
  91                 ConfigTagList tags = ServerInstance->Config->ConfTags("badchan");
  92                 for (ConfigIter j = tags.first; j != tags.second; ++j)
  93                 {
  94                         if (InspIRCd::Match(cname, j->second->getString("name")))
  95                         {
  96                                 if (IS_OPER(user) && j->second->getBool("allowopers"))
  97                                 {
  98                                         return MOD_RES_PASSTHRU;
  99                                 }
 100                                 else
 101                                 {
 102                                         std::string reason = j->second->getString("reason");
 103                                         std::string redirect = j->second->getString("redirect");
 104
 105                                         ConfigTagList goodchans = ServerInstance->Config->ConfTags("goodchan");
 106                                         for (ConfigIter i = goodchans.first; i != goodchans.second; ++i)
 107                                         {
 108                                                 if (InspIRCd::Match(cname, i->second->getString("name")))
 109                                                 {
 110                                                         return MOD_RES_PASSTHRU;
 111                                                 }
 112                                         }
 113
 114                                         if (ServerInstance->IsChannel(redirect.c_str(), ServerInstance->Config->Limits.ChanMax))
 115                                         {
 116                                                 /* simple way to avoid potential loops: don't redirect to +L channels */
 117                                                 Channel *newchan = ServerInstance->FindChan(redirect);
 118                                                 if ((!newchan) || (!(newchan->IsModeSet('L'))))
 119                                                 {
 120                                                         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());
 121                                                         Channel::JoinUser(user,redirect.c_str(),false,"",false,ServerInstance->Time());
 122                                                         return MOD_RES_DENY;
 123                                                 }
 124                                         }
 125
 126                                         user->WriteNumeric(926, "%s %s :Channel %s is forbidden: %s",user->nick.c_str(),cname,cname,reason.c_str());
 127                                         return MOD_RES_DENY;
 128                                 }
 129                         }
 130                 }
 131                 return MOD_RES_PASSTHRU;
 132         }
 133 };
 134
 135 MODULE_INIT(ModuleDenyChannels)