src/modules/m_remove.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2008 Pippijn van Steenhoven <pip88nl@gmail.com>
   6  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   7  *   Copyright (C) 2005, 2007 Robin Burchell <robin+git@viroteck.net>
   8  *   Copyright (C) 2005-2006 Craig Edwards <craigedwards@brainbox.cc>
   9  *   Copyright (C) 2006 Oliver Lupton <oliverlupton@gmail.com>
  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 /*
  28  * This module supports the use of the +q and +a usermodes, but should work without them too.
  29  * Usage of the command is restricted to +hoaq, and you cannot remove a user with a "higher" level than yourself.
  30  * eg: +h can remove +hv and users with no modes. +a can remove +aohv and users with no modes.
  31 */
  32
  33 /** Base class for /FPART and /REMOVE
  34  */
  35 class RemoveBase : public Command
  36 {
  37         bool& supportnokicks;
  38         ChanModeReference& nokicksmode;
  39
  40  public:
  41         unsigned int protectedrank;
  42
  43         RemoveBase(Module* Creator, bool& snk, ChanModeReference& nkm, const char* cmdn)
  44                 : Command(Creator, cmdn, 2, 3)
  45                 , supportnokicks(snk)
  46                 , nokicksmode(nkm)
  47         {
  48         }
  49
  50         CmdResult HandleRMB(User* user, const CommandBase::Params& parameters,  bool fpart)
  51         {
  52                 User* target;
  53                 Channel* channel;
  54                 std::string reason;
  55
  56                 // If the command is a /REMOVE then detect the parameter order
  57                 bool neworder = ((fpart) || (parameters[0][0] == '#'));
  58
  59                 /* Set these to the parameters needed, the new version of this module switches it's parameters around
  60                  * supplying a new command with the new order while keeping the old /remove with the older order.
  61                  * /remove <nick> <channel> [reason ...]
  62                  * /fpart <channel> <nick> [reason ...]
  63                  */
  64                 const std::string& channame = parameters[neworder ? 0 : 1];
  65                 const std::string& username = parameters[neworder ? 1 : 0];
  66
  67                 /* Look up the user we're meant to be removing from the channel */
  68                 if (IS_LOCAL(user))
  69                         target = ServerInstance->FindNickOnly(username);
  70                 else
  71                         target = ServerInstance->FindNick(username);
  72
  73                 /* And the channel we're meant to be removing them from */
  74                 channel = ServerInstance->FindChan(channame);
  75
  76                 /* Fix by brain - someone needs to learn to validate their input! */
  77                 if (!channel)
  78                 {
  79                         user->WriteNumeric(Numerics::NoSuchChannel(channame));
  80                         return CMD_FAILURE;
  81                 }
  82                 if ((!target) || (target->registered != REG_ALL))
  83                 {
  84                         user->WriteNumeric(Numerics::NoSuchNick(username));
  85                         return CMD_FAILURE;
  86                 }
  87
  88                 if (!channel->HasUser(target))
  89                 {
  90                         user->WriteNotice(InspIRCd::Format("*** User %s is not on channel %s", target->nick.c_str(), channel->name.c_str()));
  91                         return CMD_FAILURE;
  92                 }
  93
  94                 if (target->server->IsULine())
  95                 {
  96                         user->WriteNumeric(ERR_CHANOPRIVSNEEDED, channame, "Only a U-line may remove a U-line from a channel.");
  97                         return CMD_FAILURE;
  98                 }
  99
 100                 /* We support the +Q channel mode via. the m_nokicks module, if the module is loaded and the mode is set then disallow the /remove */
 101                 if ((!IS_LOCAL(user)) || (!supportnokicks) || (!channel->IsModeSet(nokicksmode)))
 102                 {
 103                         /* We'll let everyone remove their level and below, eg:
 104                          * ops can remove ops, halfops, voices, and those with no mode (no moders actually are set to 1)
 105                           a ulined target will get a higher level than it's possible for a /remover to get..so they're safe.
 106                          * Nobody may remove people with >= protectedrank rank.
 107                          */
 108                         unsigned int ulevel = channel->GetPrefixValue(user);
 109                         unsigned int tlevel = channel->GetPrefixValue(target);
 110                         if ((!IS_LOCAL(user)) || ((ulevel > VOICE_VALUE) && (ulevel >= tlevel) && ((protectedrank == 0) || (tlevel < protectedrank))))
 111                         {
 112                                 // REMOVE will be sent to the target's server and it will reply with a PART (or do nothing if it doesn't understand the command)
 113                                 if (!IS_LOCAL(target))
 114                                 {
 115                                         // Send an ENCAP REMOVE with parameters being in the old <user> <chan> order which is
 116                                         // compatible with both 2.0 and 3.0. This also turns FPART into REMOVE.
 117                                         CommandBase::Params p;
 118                                         p.push_back(target->uuid);
 119                                         p.push_back(channel->name);
 120                                         if (parameters.size() > 2)
 121                                                 p.push_back(":" + parameters[2]);
 122                                         ServerInstance->PI->SendEncapsulatedData(target->server->GetName(), "REMOVE", p, user);
 123
 124                                         return CMD_SUCCESS;
 125                                 }
 126
 127                                 std::string reasonparam;
 128
 129                                 /* If a reason is given, use it */
 130                                 if(parameters.size() > 2)
 131                                         reasonparam = parameters[2];
 132                                 else
 133                                         reasonparam = "No reason given";
 134
 135                                 /* Build up the part reason string. */
 136                                 reason = "Removed by " + user->nick + ": " + reasonparam;
 137
 138                                 channel->WriteNotice(InspIRCd::Format("%s removed %s from the channel", user->nick.c_str(), target->nick.c_str()));
 139                                 target->WriteNotice("*** " + user->nick + " removed you from " + channel->name + " with the message: " + reasonparam);
 140
 141                                 channel->PartUser(target, reason);
 142                         }
 143                         else
 144                         {
 145                                 user->WriteNotice(InspIRCd::Format("*** You do not have access to /REMOVE %s from %s", target->nick.c_str(), channel->name.c_str()));
 146                                 return CMD_FAILURE;
 147                         }
 148                 }
 149                 else
 150                 {
 151                         /* m_nokicks.so was loaded and +Q was set, block! */
 152                         user->WriteNumeric(ERR_RESTRICTED, channel->name, InspIRCd::Format("Can't remove user %s from channel (+Q is set)", target->nick.c_str()));
 153                         return CMD_FAILURE;
 154                 }
 155
 156                 return CMD_SUCCESS;
 157         }
 158 };
 159
 160 /** Handle /REMOVE
 161  */
 162 class CommandRemove : public RemoveBase
 163 {
 164  public:
 165         CommandRemove(Module* Creator, bool& snk, ChanModeReference& nkm)
 166                 : RemoveBase(Creator, snk, nkm, "REMOVE")
 167         {
 168                 syntax = "<channel> <nick> [:<reason>]";
 169                 TRANSLATE3(TR_NICK, TR_TEXT, TR_TEXT);
 170         }
 171
 172         CmdResult Handle(User* user, const Params& parameters) CXX11_OVERRIDE
 173         {
 174                 return HandleRMB(user, parameters, false);
 175         }
 176 };
 177
 178 /** Handle /FPART
 179  */
 180 class CommandFpart : public RemoveBase
 181 {
 182  public:
 183         CommandFpart(Module* Creator, bool& snk, ChanModeReference& nkm)
 184                 : RemoveBase(Creator, snk, nkm, "FPART")
 185         {
 186                 syntax = "<channel> <nick> [:<reason>]";
 187                 TRANSLATE3(TR_TEXT, TR_NICK, TR_TEXT);
 188         }
 189
 190         CmdResult Handle(User* user, const Params& parameters) CXX11_OVERRIDE
 191         {
 192                 return HandleRMB(user, parameters, true);
 193         }
 194 };
 195
 196 class ModuleRemove : public Module
 197 {
 198         ChanModeReference nokicksmode;
 199         CommandRemove cmd1;
 200         CommandFpart cmd2;
 201         bool supportnokicks;
 202
 203  public:
 204         ModuleRemove()
 205                 : nokicksmode(this, "nokick")
 206                 , cmd1(this, supportnokicks, nokicksmode)
 207                 , cmd2(this, supportnokicks, nokicksmode)
 208         {
 209         }
 210
 211         void On005Numeric(std::map<std::string, std::string>& tokens) CXX11_OVERRIDE
 212         {
 213                 tokens["REMOVE"];
 214         }
 215
 216         void ReadConfig(ConfigStatus& status) CXX11_OVERRIDE
 217         {
 218                 ConfigTag* tag = ServerInstance->Config->ConfValue("remove");
 219                 supportnokicks = tag->getBool("supportnokicks");
 220                 cmd1.protectedrank = cmd2.protectedrank = tag->getUInt("protectedrank", 50000);
 221         }
 222
 223         Version GetVersion() CXX11_OVERRIDE
 224         {
 225                 return Version("Provides the REMOVE command as an alternative to KICK, it makes users appear to have left the channel", VF_OPTCOMMON | VF_VENDOR);
 226         }
 227 };
 228
 229 MODULE_INIT(ModuleRemove)