src/modules/m_remove.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15
  16 /* $ModDesc: Provides a /remove command, this is mostly an alternative to /kick, except makes users appear to have parted the channel */
  17
  18 /*
  19  * This module supports the use of the +q and +a usermodes, but should work without them too.
  20  * Usage of the command is restricted to +hoaq, and you cannot remove a user with a "higher" level than yourself.
  21  * eg: +h can remove +hv and users with no modes. +a can remove +aohv and users with no modes.
  22 */
  23
  24 /** Base class for /FPART and /REMOVE
  25  */
  26 class RemoveBase
  27 {
  28  private:
  29         bool& supportnokicks;
  30         InspIRCd* ServerInstance;
  31
  32  protected:
  33         RemoveBase(InspIRCd* Instance, bool& snk) : supportnokicks(snk), ServerInstance(Instance)
  34         {
  35         }
  36
  37         enum ModeLevel { PEON = 0, HALFOP = 1, OP = 2, ADMIN = 3, OWNER = 4, ULINE = 5 };
  38
  39         /* This little function just converts a chanmode character (U ~ & @ & +) into an integer (5 4 3 2 1 0) */
  40         /* XXX - We should probably use the new mode prefix rank stuff
  41          * for this instead now -- Brain */
  42         ModeLevel chartolevel(const std::string &privs)
  43         {
  44                 if(privs.empty())
  45                 {
  46                         return PEON;
  47                 }
  48
  49                 switch (privs[0])
  50                 {
  51                         case 'U':
  52                                 /* Ulined */
  53                                 return ULINE;
  54                         case '~':
  55                                 /* Owner */
  56                                 return OWNER;
  57                         case '&':
  58                                 /* Admin */
  59                                 return ADMIN;
  60                         case '@':
  61                                 /* Operator */
  62                                 return OP;
  63                         case '%':
  64                                 /* Halfop */
  65                                 return HALFOP;
  66                         default:
  67                                 /* Peon */
  68                                 return PEON;
  69                 }
  70         }
  71
  72         CmdResult Handle (const std::vector<std::string>& parameters, User *user, bool neworder)
  73         {
  74                 const char* channame;
  75                 const char* username;
  76                 User* target;
  77                 Channel* channel;
  78                 ModeLevel tlevel;
  79                 ModeLevel ulevel;
  80                 std::string reason;
  81                 std::string protectkey;
  82                 std::string founderkey;
  83                 bool hasnokicks;
  84
  85                 /* Set these to the parameters needed, the new version of this module switches it's parameters around
  86                  * supplying a new command with the new order while keeping the old /remove with the older order.
  87                  * /remove <nick> <channel> [reason ...]
  88                  * /fpart <channel> <nick> [reason ...]
  89                  */
  90                 channame = parameters[ neworder ? 0 : 1].c_str();
  91                 username = parameters[ neworder ? 1 : 0].c_str();
  92
  93                 /* Look up the user we're meant to be removing from the channel */
  94                 target = ServerInstance->FindNick(username);
  95
  96                 /* And the channel we're meant to be removing them from */
  97                 channel = ServerInstance->FindChan(channame);
  98
  99                 /* Fix by brain - someone needs to learn to validate their input! */
 100                 if (!target || !channel)
 101                 {
 102                         user->WriteNumeric(ERR_NOSUCHNICK, "%s %s :No such nick/channel", user->nick.c_str(), !target ? username : channame);
 103                         return CMD_FAILURE;
 104                 }
 105
 106                 if (!channel->HasUser(target))
 107                 {
 108                         user->WriteServ( "NOTICE %s :*** The user %s is not on channel %s", user->nick.c_str(), target->nick.c_str(), channel->name.c_str());
 109                         return CMD_FAILURE;
 110                 }
 111
 112                 /* This is adding support for the +q and +a channel modes, basically if they are enabled, and the remover has them set.
 113                  * Then we change the @|%|+ to & if they are +a, or ~ if they are +q */
 114                 protectkey = "cm_protect_" + std::string(channel->name);
 115                 founderkey = "cm_founder_" + std::string(channel->name);
 116
 117                 if (ServerInstance->ULine(user->server) || ServerInstance->ULine(user->nick.c_str()))
 118                 {
 119                         ulevel = chartolevel("U");
 120                 }
 121                 if (user->GetExt(founderkey))
 122                 {
 123                         ulevel = chartolevel("~");
 124                 }
 125                 else if (user->GetExt(protectkey))
 126                 {
 127                         ulevel = chartolevel("&");
 128                 }
 129                 else
 130                 {
 131                         ulevel = chartolevel(channel->GetPrefixChar(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 (ServerInstance->ULine(target->server) || ServerInstance->ULine(target->nick.c_str()))
 136                 {
 137                         tlevel = chartolevel("U");
 138                 }
 139                 else if (target->GetExt(founderkey))
 140                 {
 141                         tlevel = chartolevel("~");
 142                 }
 143                 else if (target->GetExt(protectkey))
 144                 {
 145                         tlevel = chartolevel("&");
 146                 }
 147                 else
 148                 {
 149                         tlevel = chartolevel(channel->GetPrefixChar(target));
 150                 }
 151
 152                 hasnokicks = (ServerInstance->Modules->Find("m_nokicks.so") && channel->IsModeSet('Q'));
 153
 154                 /* 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 */
 155                 if ((!IS_LOCAL(user)) || (!supportnokicks || !hasnokicks || (ulevel == ULINE)))
 156                 {
 157                         /* We'll let everyone remove their level and below, eg:
 158                          * ops can remove ops, halfops, voices, and those with no mode (no moders actually are set to 1)
 159                          * a ulined target will get a higher level than it's possible for a /remover to get..so they're safe.
 160                          * Nobody may remove a founder.
 161                          */
 162                         if ((!IS_LOCAL(user)) || ((ulevel > PEON) && (ulevel >= tlevel) && (tlevel != OWNER)))
 163                         {
 164                                 // no you can't just go from a std::ostringstream to a std::string, Om. -nenolod
 165                                 // but you can do this, nenolod -brain
 166
 167                                 std::string reasonparam("No reason given");
 168
 169                                 /* If a reason is given, use it */
 170                                 if(parameters.size() > 2)
 171                                 {
 172                                         /* Join params 2 ... pcnt - 1 (inclusive) into one */
 173                                         irc::stringjoiner reason_join(" ", parameters, 2, parameters.size() - 1);
 174                                         reasonparam = reason_join.GetJoined();
 175                                 }
 176
 177                                 /* Build up the part reason string. */
 178                                 reason = std::string("Removed by ") + user->nick + ": " + reasonparam;
 179
 180                                 channel->WriteChannelWithServ(ServerInstance->Config->ServerName, "NOTICE %s :%s removed %s from the channel", channel->name.c_str(), user->nick.c_str(), target->nick.c_str());
 181                                 target->WriteServ("NOTICE %s :*** %s removed you from %s with the message: %s", target->nick.c_str(), user->nick.c_str(), channel->name.c_str(), reasonparam.c_str());
 182
 183                                 if (!channel->PartUser(target, reason))
 184                                         delete channel;
 185                         }
 186                         else
 187                         {
 188                                 user->WriteServ( "NOTICE %s :*** You do not have access to /remove %s from %s", user->nick.c_str(), target->nick.c_str(), channel->name.c_str());
 189                                 return CMD_FAILURE;
 190                         }
 191                 }
 192                 else
 193                 {
 194                         /* m_nokicks.so was loaded and +Q was set, block! */
 195                         user->WriteServ( "484 %s %s :Can't remove user %s from channel (+Q set)", user->nick.c_str(), channel->name.c_str(), target->nick.c_str());
 196                         return CMD_FAILURE;
 197                 }
 198
 199                 /* route me */
 200                 return CMD_SUCCESS;
 201         }
 202 };
 203
 204 /** Handle /REMOVE
 205  */
 206 class CommandRemove : public Command, public RemoveBase
 207 {
 208  public:
 209         CommandRemove(InspIRCd* Instance, bool& snk) : Command(Instance, "REMOVE", 0, 2), RemoveBase(Instance, snk)
 210         {
 211                 this->source = "m_remove.so";
 212                 syntax = "<nick> <channel> [<reason>]";
 213                 TRANSLATE4(TR_NICK, TR_TEXT, TR_TEXT, TR_END);
 214         }
 215
 216         CmdResult Handle (const std::vector<std::string>& parameters, User *user)
 217         {
 218                 return RemoveBase::Handle(parameters, user, false);
 219         }
 220 };
 221
 222 /** Handle /FPART
 223  */
 224 class CommandFpart : public Command, public RemoveBase
 225 {
 226  public:
 227         CommandFpart(InspIRCd* Instance, bool& snk) : Command(Instance, "FPART", 0, 2), RemoveBase(Instance, snk)
 228         {
 229                 this->source = "m_remove.so";
 230                 syntax = "<channel> <nick> [<reason>]";
 231         }
 232
 233         CmdResult Handle (const std::vector<std::string>& parameters, User *user)
 234         {
 235                 return RemoveBase::Handle(parameters, user, true);
 236         }
 237 };
 238
 239 class ModuleRemove : public Module
 240 {
 241         CommandRemove* mycommand;
 242         CommandFpart* mycommand2;
 243         bool supportnokicks;
 244
 245
 246  public:
 247         ModuleRemove(InspIRCd* Me)
 248         : Module(Me)
 249         {
 250                 mycommand = new CommandRemove(ServerInstance, supportnokicks);
 251                 mycommand2 = new CommandFpart(ServerInstance, supportnokicks);
 252                 ServerInstance->AddCommand(mycommand);
 253                 ServerInstance->AddCommand(mycommand2);
 254                 OnRehash(NULL,"");
 255                 Implementation eventlist[] = { I_On005Numeric, I_OnRehash };
 256                 ServerInstance->Modules->Attach(eventlist, this, 2);
 257         }
 258
 259
 260         virtual void On005Numeric(std::string &output)
 261         {
 262                 output.append(" REMOVE");
 263         }
 264
 265         virtual void OnRehash(User* user, const std::string&)
 266         {
 267                 ConfigReader conf(ServerInstance);
 268                 supportnokicks = conf.ReadFlag("remove", "supportnokicks", 0);
 269         }
 270
 271         virtual ~ModuleRemove()
 272         {
 273         }
 274
 275         virtual Version GetVersion()
 276         {
 277                 return Version(1, 2, 1, 0, VF_COMMON | VF_VENDOR, API_VERSION);
 278         }
 279
 280 };
 281
 282 MODULE_INIT(ModuleRemove)