src/modules/m_channames.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2013, 2017 Sadie Powell <sadie@witchery.services>
   5  *   Copyright (C) 2013 Daniel Vassdal <shutter@canternet.org>
   6  *   Copyright (C) 2012-2014 Attila Molnar <attilamolnar@hush.com>
   7  *   Copyright (C) 2012 Robby <robby@chatbelgie.be>
   8  *   Copyright (C) 2010 Craig Edwards <brain@inspircd.org>
   9  *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
  10  *
  11  * This file is part of InspIRCd.  InspIRCd is free software: you can
  12  * redistribute it and/or modify it under the terms of the GNU General Public
  13  * License as published by the Free Software Foundation, version 2.
  14  *
  15  * This program is distributed in the hope that it will be useful, but WITHOUT
  16  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  17  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  18  * details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24
  25 #include "inspircd.h"
  26
  27 static std::bitset<256> allowedmap;
  28
  29 class NewIsChannelHandler
  30 {
  31  public:
  32         static bool Call(const std::string&);
  33 };
  34
  35 bool NewIsChannelHandler::Call(const std::string& channame)
  36 {
  37         if (channame.empty() || channame.length() > ServerInstance->Config->Limits.ChanMax || channame[0] != '#')
  38                 return false;
  39
  40         for (std::string::const_iterator c = channame.begin(); c != channame.end(); ++c)
  41         {
  42                 unsigned int i = *c & 0xFF;
  43                 if (!allowedmap[i])
  44                         return false;
  45         }
  46
  47         return true;
  48 }
  49
  50 class ModuleChannelNames : public Module
  51 {
  52         TR1NS::function<bool(const std::string&)> rememberer;
  53         bool badchan;
  54         ChanModeReference permchannelmode;
  55
  56  public:
  57         ModuleChannelNames()
  58                 : rememberer(ServerInstance->IsChannel)
  59                 , badchan(false)
  60                 , permchannelmode(this, "permanent")
  61         {
  62         }
  63
  64         void init() CXX11_OVERRIDE
  65         {
  66                 ServerInstance->IsChannel = NewIsChannelHandler::Call;
  67         }
  68
  69         void ValidateChans()
  70         {
  71                 Modes::ChangeList removepermchan;
  72
  73                 badchan = true;
  74                 const chan_hash& chans = ServerInstance->GetChans();
  75                 for (chan_hash::const_iterator i = chans.begin(); i != chans.end(); )
  76                 {
  77                         Channel* c = i->second;
  78                         // Move iterator before we begin kicking
  79                         ++i;
  80                         if (ServerInstance->IsChannel(c->name))
  81                                 continue; // The name of this channel is still valid
  82
  83                         if (c->IsModeSet(permchannelmode) && c->GetUserCounter())
  84                         {
  85                                 removepermchan.clear();
  86                                 removepermchan.push_remove(*permchannelmode);
  87                                 ServerInstance->Modes->Process(ServerInstance->FakeClient, c, NULL, removepermchan);
  88                         }
  89
  90                         Channel::MemberMap& users = c->userlist;
  91                         for (Channel::MemberMap::iterator j = users.begin(); j != users.end(); )
  92                         {
  93                                 if (IS_LOCAL(j->first))
  94                                 {
  95                                         // KickUser invalidates the iterator
  96                                         Channel::MemberMap::iterator it = j++;
  97                                         c->KickUser(ServerInstance->FakeClient, it, "Channel name no longer valid");
  98                                 }
  99                                 else
 100                                         ++j;
 101                         }
 102                 }
 103                 badchan = false;
 104         }
 105
 106         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 107         {
 108                 ConfigTag* tag = ServerInstance->Config->ConfValue("channames");
 109                 std::string denyToken = tag->getString("denyrange");
 110                 std::string allowToken = tag->getString("allowrange");
 111
 112                 if (!denyToken.compare(0, 2, "0-"))
 113                         denyToken[0] = '1';
 114                 if (!allowToken.compare(0, 2, "0-"))
 115                         allowToken[0] = '1';
 116
 117                 allowedmap.set();
 118
 119                 irc::portparser denyrange(denyToken, false);
 120                 int denyno = -1;
 121                 while (0 != (denyno = denyrange.GetToken()))
 122                         allowedmap[denyno & 0xFF] = false;
 123
 124                 irc::portparser allowrange(allowToken, false);
 125                 int allowno = -1;
 126                 while (0 != (allowno = allowrange.GetToken()))
 127                         allowedmap[allowno & 0xFF] = true;
 128
 129                 allowedmap[0x07] = false; // BEL
 130                 allowedmap[0x20] = false; // ' '
 131                 allowedmap[0x2C] = false; // ','
 132
 133                 ValidateChans();
 134         }
 135
 136         void OnUserKick(User* source, Membership* memb, const std::string &reason, CUList& except_list) CXX11_OVERRIDE
 137         {
 138                 if (badchan)
 139                 {
 140                         const Channel::MemberMap& users = memb->chan->GetUsers();
 141                         for (Channel::MemberMap::const_iterator i = users.begin(); i != users.end(); ++i)
 142                                 if (i->first != memb->user)
 143                                         except_list.insert(i->first);
 144                 }
 145         }
 146
 147         CullResult cull() CXX11_OVERRIDE
 148         {
 149                 ServerInstance->IsChannel = rememberer;
 150                 ValidateChans();
 151                 return Module::cull();
 152         }
 153
 154         Version GetVersion() CXX11_OVERRIDE
 155         {
 156                 return Version("Allows the server administrator to define what characters are allowed in channel names.", VF_VENDOR);
 157         }
 158 };
 159
 160 MODULE_INIT(ModuleChannelNames)