src/modules/m_remove.cpp

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