src/modules/m_remove.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                     E-mail:
   7  *              <brain@chatspike.net>
   8  *              <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  * the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 /* Support for a dancer-style /remove command, an alternative to /kick to try and avoid auto-rejoin-on-kick scripts */
  18 /* Written by Om, 25-03-05 */
  19
  20 #include <sstream>
  21 #include "users.h"
  22 #include "channels.h"
  23 #include "modules.h"
  24 #include "configreader.h"
  25 #include "inspircd.h"
  26
  27 /* $ModDesc: Provides a /remove command, this is mostly an alternative to /kick, except makes users appear to have parted the channel */
  28
  29 /*
  30  * This module supports the use of the +q and +a usermodes, but should work without them too.
  31  * Usage of the command is restricted to +hoaq, and you cannot remove a user with a "higher" level than yourself.
  32  * eg: +h can remove +hv and users with no modes. +a can remove +aohv and users with no modes.
  33 */
  34
  35 class RemoveBase
  36 {
  37  private:
  38         bool& supportnokicks;
  39         InspIRCd* ServerInstance;
  40
  41  protected:
  42         RemoveBase(InspIRCd* Instance, bool& snk) : supportnokicks(snk), ServerInstance(Instance)
  43         {
  44         }
  45
  46         enum ModeLevel { PEON = 0, HALFOP = 1, OP = 2, ADMIN = 3, OWNER = 4, ULINE = 5 };
  47
  48         /* This little function just converts a chanmode character (U ~ & @ & +) into an integer (5 4 3 2 1 0) */
  49         /* XXX - this could be handy in the core, so it can be used elsewhere */
  50         ModeLevel chartolevel(const std::string &privs)
  51         {
  52                 if(privs.empty())
  53                 {
  54                         return PEON;
  55                 }
  56
  57                 switch (privs[0])
  58                 {
  59                         case 'U':
  60                                 /* Ulined */
  61                                 return ULINE;
  62                         case '~':
  63                                 /* Owner */
  64                                 return OWNER;
  65                         case '&':
  66                                 /* Admin */
  67                                 return ADMIN;
  68                         case '@':
  69                                 /* Operator */
  70                                 return OP;
  71                         case '%':
  72                                 /* Halfop */
  73                                 return HALFOP;
  74                         default:
  75                                 /* Peon */
  76                                 return PEON;
  77                 }
  78         }
  79
  80         void Handle (const char** parameters, int pcnt, userrec *user, bool neworder)
  81         {
  82                 const char* channame;
  83                 const char* username;
  84                 userrec* target;
  85                 chanrec* channel;
  86                 ModeLevel tlevel;
  87                 ModeLevel ulevel;
  88                 std::ostringstream reason;
  89                 std::string protectkey;
  90                 std::string founderkey;
  91                 bool hasnokicks;
  92
  93                 /* Set these to the parameters needed, the new version of this module switches it's parameters around
  94                  * supplying a new command with the new order while keeping the old /remove with the older order.
  95                  * /remove <nick> <channel> [reason ...]
  96                  * /fpart <channel> <nick> [reason ...]
  97                  */
  98                 channame = parameters[ neworder ? 0 : 1];
  99                 username = parameters[ neworder ? 1 : 0];
 100
 101                 /* Look up the user we're meant to be removing from the channel */
 102                 target = ServerInstance->FindNick(username);
 103
 104                 /* And the channel we're meant to be removing them from */
 105                 channel = ServerInstance->FindChan(channame);
 106
 107                 /* Fix by brain - someone needs to learn to validate their input! */
 108                 if (!target || !channel)
 109                 {
 110                         user->WriteServ("401 %s %s :No such nick/channel", user->nick, !target ? username : channame);
 111                         return;
 112                 }
 113
 114                 if (!channel->HasUser(target))
 115                 {
 116                         user->WriteServ( "NOTICE %s :*** The user %s is not on channel %s", user->nick, target->nick, channel->name);
 117                         return;
 118                 }
 119
 120                 /* This is adding support for the +q and +a channel modes, basically if they are enabled, and the remover has them set.
 121                  * Then we change the @|%|+ to & if they are +a, or ~ if they are +q */
 122                 protectkey = "cm_protect_" + std::string(channel->name);
 123                 founderkey = "cm_founder_" + std::string(channel->name);
 124
 125                 if (ServerInstance->ULine(user->server) || ServerInstance->ULine(user->nick))
 126                 {
 127                         ServerInstance->Log(DEBUG, "Setting ulevel to U");
 128                         ulevel = chartolevel("U");
 129                 }
 130                 if (user->GetExt(founderkey))
 131                 {
 132                         ServerInstance->Log(DEBUG, "Setting ulevel to ~");
 133                         ulevel = chartolevel("~");
 134                 }
 135                 else if (user->GetExt(protectkey))
 136                 {
 137                         ServerInstance->Log(DEBUG, "Setting ulevel to &");
 138                         ulevel = chartolevel("&");
 139                 }
 140                 else
 141                 {
 142                         ServerInstance->Log(DEBUG, "Setting ulevel to %s", channel->GetPrefixChar(user));
 143                         ulevel = chartolevel(channel->GetPrefixChar(user));
 144                 }
 145
 146                 /* Now it's the same idea, except for the target. If they're ulined make sure they get a higher level than the sender can */
 147                 if (ServerInstance->ULine(target->server) || ServerInstance->ULine(target->nick))
 148                 {
 149                         ServerInstance->Log(DEBUG, "Setting tlevel to U");
 150                         tlevel = chartolevel("U");
 151                 }
 152                 else if (target->GetExt(founderkey))
 153                 {
 154                         ServerInstance->Log(DEBUG, "Setting tlevel to ~");
 155                         tlevel = chartolevel("~");
 156                 }
 157                 else if (target->GetExt(protectkey))
 158                 {
 159                         ServerInstance->Log(DEBUG, "Setting tlevel to &");
 160                         tlevel = chartolevel("&");
 161                 }
 162                 else
 163                 {
 164                         ServerInstance->Log(DEBUG, "Setting tlevel to %s", channel->GetPrefixChar(target));
 165                         tlevel = chartolevel(channel->GetPrefixChar(target));
 166                 }
 167
 168                 hasnokicks = (ServerInstance->FindModule("m_nokicks.so") && channel->IsModeSet('Q'));
 169
 170                 /* 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 */
 171                 if(!supportnokicks || !hasnokicks || (ulevel == ULINE))
 172                 {
 173                         /* We'll let everyone remove their level and below, eg:
 174                          * ops can remove ops, halfops, voices, and those with no mode (no moders actually are set to 1)
 175                          * a ulined target will get a higher level than it's possible for a /remover to get..so they're safe.
 176                          * Nobody may remove a founder.
 177                          */
 178                         if ((ulevel > PEON) && (ulevel >= tlevel) && (tlevel != OWNER))
 179                         {
 180                                 std::string reasonparam;
 181
 182                                 /* If a reason is given, use it */
 183                                 if(pcnt > 2)
 184                                 {
 185                                          reason <<  ":";
 186
 187                                         /* Use all the remaining parameters as the reason */
 188                                         for(int i = 2; i < pcnt; i++)
 189                                         {
 190                                                 reason << " " << parameters[i];
 191                                         }
 192
 193                                         reasonparam = reason.str();
 194                                         reason.clear();
 195                                 }
 196
 197                                 /* Build up the part reason string. */
 198                                 reason << "Removed by " << user->nick << reasonparam;
 199
 200                                 channel->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE %s :%s removed %s from the channel", channel->name, user->nick, target->nick);
 201                                 target->WriteServ("NOTICE %s :*** %s removed you from %s with the message: %s", target->nick, user->nick, channel->name, reasonparam.c_str());
 202
 203                                 if (!channel->PartUser(target, reason.str().c_str()))
 204                                         delete channel;
 205                         }
 206                         else
 207                         {
 208                                 user->WriteServ( "NOTICE %s :*** You do not have access to /remove %s from %s", user->nick, target->nick, channel->name);
 209                         }
 210                 }
 211                 else
 212                 {
 213                         /* m_nokicks.so was loaded and +Q was set, block! */
 214                         user->WriteServ( "484 %s %s :Can't remove user %s from channel (+Q set)", user->nick, channel->name, target->nick);
 215                 }
 216         }
 217 };
 218
 219 class cmd_remove : public command_t, public RemoveBase
 220 {
 221  public:
 222         cmd_remove(InspIRCd* Instance, bool& snk) : command_t(Instance, "REMOVE", 0, 2), RemoveBase(Instance, snk)
 223         {
 224                 this->source = "m_remove.so";
 225                 syntax = "<nick> <channel> [<reason>]";
 226         }
 227
 228         void Handle (const char** parameters, int pcnt, userrec *user)
 229         {
 230                 RemoveBase::Handle(parameters, pcnt, user, false);
 231         }
 232 };
 233
 234 class cmd_fpart : public command_t, public RemoveBase
 235 {
 236  public:
 237         cmd_fpart(InspIRCd* Instance, bool& snk) : command_t(Instance, "FPART", 0, 2), RemoveBase(Instance, snk)
 238         {
 239                 this->source = "m_remove.so";
 240                 syntax = "<channel> <nick> [<reason>]";
 241         }
 242
 243         void Handle (const char** parameters, int pcnt, userrec *user)
 244         {
 245                 RemoveBase::Handle(parameters, pcnt, user, true);
 246         }
 247 };
 248
 249 class ModuleRemove : public Module
 250 {
 251         cmd_remove* mycommand;
 252         cmd_fpart* mycommand2;
 253         bool supportnokicks;
 254
 255
 256  public:
 257         ModuleRemove(InspIRCd* Me)
 258         : Module::Module(Me)
 259         {
 260                 mycommand = new cmd_remove(ServerInstance, supportnokicks);
 261                 mycommand2 = new cmd_fpart(ServerInstance, supportnokicks);
 262                 ServerInstance->AddCommand(mycommand);
 263                 ServerInstance->AddCommand(mycommand2);
 264                 OnRehash("");
 265         }
 266
 267         void Implements(char* List)
 268         {
 269                 List[I_On005Numeric] = List[I_OnRehash] = 1;
 270         }
 271
 272         virtual void On005Numeric(std::string &output)
 273         {
 274                 output.append(" REMOVE");
 275         }
 276
 277         virtual void OnRehash(const std::string&)
 278         {
 279                 ConfigReader conf(ServerInstance);
 280                 supportnokicks = conf.ReadFlag("remove", "supportnokicks", 0);
 281         }
 282
 283         virtual ~ModuleRemove()
 284         {
 285                 delete mycommand;
 286                 delete mycommand2;
 287         }
 288
 289         virtual Version GetVersion()
 290         {
 291                 return Version(1,0,1,0,VF_VENDOR);
 292         }
 293
 294 };
 295
 296 // stuff down here is the module-factory stuff. For basic modules you can ignore this.
 297
 298 class ModuleRemoveFactory : public ModuleFactory
 299 {
 300  public:
 301         ModuleRemoveFactory()
 302         {
 303         }
 304
 305         ~ModuleRemoveFactory()
 306         {
 307         }
 308
 309         virtual Module * CreateModule(InspIRCd* Me)
 310         {
 311                 return new ModuleRemove(Me);
 312         }
 313
 314 };
 315
 316
 317 extern "C" void * init_module( void )
 318 {
 319         return new ModuleRemoveFactory;
 320 }