src/modules/m_blockcaps.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2006, 2008 Craig Edwards <craigedwards@brainbox.cc>
   5  *   Copyright (C) 2006-2007 Dennis Friis <peavey@inspircd.org>
   6  *   Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
   7  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
   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 #include "modules/exemption.h"
  25
  26 class ModuleBlockCAPS : public Module
  27 {
  28         CheckExemption::EventProvider exemptionprov;
  29         SimpleChannelModeHandler bc;
  30         unsigned int percent;
  31         unsigned int minlen;
  32         std::bitset<UCHAR_MAX> lowercase;
  33         std::bitset<UCHAR_MAX> uppercase;
  34
  35 public:
  36         ModuleBlockCAPS()
  37                 : exemptionprov(this)
  38                 , bc(this, "blockcaps", 'B')
  39         {
  40         }
  41
  42         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
  43         {
  44                 tokens["EXTBAN"].push_back('B');
  45         }
  46
  47         ModResult OnUserPreMessage(User* user, const MessageTarget& target, MessageDetails& details) CXX11_OVERRIDE
  48         {
  49                 if (target.type == MessageTarget::TYPE_CHANNEL)
  50                 {
  51                         if (!IS_LOCAL(user))
  52                                 return MOD_RES_PASSTHRU;
  53
  54                         Channel* c = target.Get<Channel>();
  55                         ModResult res = CheckExemption::Call(exemptionprov, user, c, "blockcaps");
  56
  57                         if (res == MOD_RES_ALLOW)
  58                                 return MOD_RES_PASSTHRU;
  59
  60                         if (!c->GetExtBanStatus(user, 'B').check(!c->IsModeSet(bc)))
  61                         {
  62                                 // If the message is a CTCP then we skip it unless it is
  63                                 // an ACTION in which case we strip the prefix and suffix.
  64                                 std::string::const_iterator text_begin = details.text.begin();
  65                                 std::string::const_iterator text_end = details.text.end();
  66                                 if (details.text[0] == '\1')
  67                                 {
  68                                         // If the CTCP is not an action then skip it.
  69                                         if (details.text.compare(0, 8, "\1ACTION ", 8))
  70                                                 return MOD_RES_PASSTHRU;
  71
  72                                         // Skip the CTCP message characters.
  73                                         text_begin += 8;
  74                                         if (*details.text.rbegin() == '\1')
  75                                                 text_end -= 1;
  76                                 }
  77
  78                                 // If the message is shorter than the minimum length
  79                                 // then we don't need to do anything else.
  80                                 size_t length = std::distance(text_begin, text_end);
  81                                 if (length < minlen)
  82                                         return MOD_RES_PASSTHRU;
  83
  84                                 // Count the characters to see how many upper case and
  85                                 // ignored (non upper or lower) characters there are.
  86                                 size_t upper = 0;
  87                                 for (std::string::const_iterator iter = text_begin; iter != text_end; ++iter)
  88                                 {
  89                                         unsigned char chr = static_cast<unsigned char>(*iter);
  90                                         if (uppercase.test(chr))
  91                                                 upper += 1;
  92                                         else if (!lowercase.test(chr))
  93                                                 length -= 1;
  94                                 }
  95
  96                                 // Calculate the percentage which is upper case. If the
  97                                 // message was entirely symbols then it can't contain
  98                                 // any upper case letters.
  99                                 if (length > 0 && round((upper * 100) / length) >= percent)
 100                                 {
 101                                         user->WriteNumeric(ERR_CANNOTSENDTOCHAN, c->name, InspIRCd::Format("Your message cannot contain %d%% or more capital letters if it's longer than %d characters", percent, minlen));
 102                                         return MOD_RES_DENY;
 103                                 }
 104                         }
 105                 }
 106                 return MOD_RES_PASSTHRU;
 107         }
 108
 109         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 110         {
 111                 ConfigTag* tag = ServerInstance->Config->ConfValue("blockcaps");
 112                 percent = tag->getUInt("percent", 100, 1, 100);
 113                 minlen = tag->getUInt("minlen", 1, 1, ServerInstance->Config->Limits.MaxLine);
 114
 115                 lowercase.reset();
 116                 const std::string lower = tag->getString("lowercase", "abcdefghijklmnopqrstuvwxyz");
 117                 for (std::string::const_iterator iter = lower.begin(); iter != lower.end(); ++iter)
 118                         lowercase.set(static_cast<unsigned char>(*iter));
 119
 120                 uppercase.reset();
 121                 const std::string upper = tag->getString("uppercase", tag->getString("capsmap", "ABCDEFGHIJKLMNOPQRSTUVWXYZ"));
 122                 for (std::string::const_iterator iter = upper.begin(); iter != upper.end(); ++iter)
 123                         uppercase.set(static_cast<unsigned char>(*iter));
 124         }
 125
 126         Version GetVersion() CXX11_OVERRIDE
 127         {
 128                 return Version("Provides support to block all-CAPS channel messages and notices", VF_VENDOR);
 129         }
 130 };
 131
 132 MODULE_INIT(ModuleBlockCAPS)