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 class ModuleDenyChannels : public Module
  26 {
  27         ChanModeReference redirectmode;
  28
  29  public:
  30         ModuleDenyChannels()
  31                 : redirectmode(this, "redirect")
  32         {
  33         }
  34
  35         void init() CXX11_OVERRIDE
  36         {
  37                 Implementation eventlist[] = { I_OnUserPreJoin, I_OnRehash };
  38                 ServerInstance->Modules->Attach(eventlist, this, sizeof(eventlist)/sizeof(Implementation));
  39         }
  40
  41         void OnRehash(User* user) CXX11_OVERRIDE
  42         {
  43                 /* check for redirect validity and loops/chains */
  44                 ConfigTagList tags = ServerInstance->Config->ConfTags("badchan");
  45                 for (ConfigIter i = tags.first; i != tags.second; ++i)
  46                 {
  47                         std::string name = i->second->getString("name");
  48                         std::string redirect = i->second->getString("redirect");
  49
  50                         if (!redirect.empty())
  51                         {
  52
  53                                 if (!ServerInstance->IsChannel(redirect))
  54                                 {
  55                                         if (user)
  56                                                 user->WriteNotice("Invalid badchan redirect '" + redirect + "'");
  57                                         throw ModuleException("Invalid badchan redirect, not a channel");
  58                                 }
  59
  60                                 for (ConfigIter j = tags.first; j != tags.second; ++j)
  61                                 {
  62                                         if (InspIRCd::Match(redirect, j->second->getString("name")))
  63                                         {
  64                                                 bool goodchan = false;
  65                                                 ConfigTagList goodchans = ServerInstance->Config->ConfTags("badchan");
  66                                                 for (ConfigIter k = goodchans.first; k != goodchans.second; ++k)
  67                                                 {
  68                                                         if (InspIRCd::Match(redirect, k->second->getString("name")))
  69                                                                 goodchan = true;
  70                                                 }
  71
  72                                                 if (!goodchan)
  73                                                 {
  74                                                         /* <badchan:redirect> is a badchan */
  75                                                         if (user)
  76                                                                 user->WriteNotice("Badchan " + name + " redirects to badchan " + redirect);
  77                                                         throw ModuleException("Badchan redirect loop");
  78                                                 }
  79                                         }
  80                                 }
  81                         }
  82                 }
  83         }
  84
  85         Version GetVersion() CXX11_OVERRIDE
  86         {
  87                 return Version("Implements config tags which allow blocking of joins to channels", VF_VENDOR);
  88         }
  89
  90
  91         ModResult OnUserPreJoin(LocalUser* user, Channel* chan, const std::string& cname, std::string& privs, const std::string& keygiven) CXX11_OVERRIDE
  92         {
  93                 ConfigTagList tags = ServerInstance->Config->ConfTags("badchan");
  94                 for (ConfigIter j = tags.first; j != tags.second; ++j)
  95                 {
  96                         if (InspIRCd::Match(cname, j->second->getString("name")))
  97                         {
  98                                 if (user->IsOper() && j->second->getBool("allowopers"))
  99                                 {
 100                                         return MOD_RES_PASSTHRU;
 101                                 }
 102                                 else
 103                                 {
 104                                         std::string reason = j->second->getString("reason");
 105                                         std::string redirect = j->second->getString("redirect");
 106
 107                                         ConfigTagList goodchans = ServerInstance->Config->ConfTags("goodchan");
 108                                         for (ConfigIter i = goodchans.first; i != goodchans.second; ++i)
 109                                         {
 110                                                 if (InspIRCd::Match(cname, i->second->getString("name")))
 111                                                 {
 112                                                         return MOD_RES_PASSTHRU;
 113                                                 }
 114                                         }
 115
 116                                         if (ServerInstance->IsChannel(redirect))
 117                                         {
 118                                                 /* simple way to avoid potential loops: don't redirect to +L channels */
 119                                                 Channel *newchan = ServerInstance->FindChan(redirect);
 120                                                 if ((!newchan) || (!newchan->IsModeSet(redirectmode)))
 121                                                 {
 122                                                         user->WriteNumeric(926, "%s %s :Channel %s is forbidden, redirecting to %s: %s",user->nick.c_str(),cname.c_str(),cname.c_str(),redirect.c_str(), reason.c_str());
 123                                                         Channel::JoinUser(user, redirect);
 124                                                         return MOD_RES_DENY;
 125                                                 }
 126                                         }
 127
 128                                         user->WriteNumeric(926, "%s %s :Channel %s is forbidden: %s",user->nick.c_str(),cname.c_str(),cname.c_str(),reason.c_str());
 129                                         return MOD_RES_DENY;
 130                                 }
 131                         }
 132                 }
 133                 return MOD_RES_PASSTHRU;
 134         }
 135 };
 136
 137 MODULE_INIT(ModuleDenyChannels)