src/modules/m_chanprotect.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 #include "users.h"
  18 #include "channels.h"
  19 #include "modules.h"
  20 #include "inspircd.h"
  21
  22 /* $ModDesc: Provides channel modes +a and +q */
  23
  24 #define PROTECT_VALUE 40000
  25 #define FOUNDER_VALUE 50000
  26
  27 const char* fakevalue = "on";
  28
  29 /* When this is set to true, no restrictions apply to setting or
  30  * removal of +qa. This is used while unloading so that the server
  31  * can freely clear all of its users of the modes.
  32  */
  33 bool unload_kludge = false;
  34
  35 class FounderProtectBase
  36 {
  37  private:
  38         InspIRCd* MyInstance;
  39         std::string extend;
  40         std::string type;
  41         int list;
  42         int end;
  43         char* dummyptr;
  44  public:
  45         FounderProtectBase(InspIRCd* Instance, const std::string &ext, const std::string &mtype, int l, int e) : MyInstance(Instance), extend(ext), type(mtype), list(l), end(e)
  46         {
  47         }
  48
  49         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
  50         {
  51                 userrec* x = MyInstance->FindNick(parameter);
  52                 if (x)
  53                 {
  54                         if (!channel->HasUser(x))
  55                         {
  56                                 return std::make_pair(false, parameter);
  57                         }
  58                         else
  59                         {
  60                                 std::string item = extend+std::string(channel->name);
  61                                 if (x->GetExt(item,dummyptr))
  62                                 {
  63                                         return std::make_pair(true, x->nick);
  64                                 }
  65                                 else
  66                                 {
  67                                         return std::make_pair(false, parameter);
  68                                 }
  69                         }
  70                 }
  71                 return std::make_pair(false, parameter);
  72         }
  73
  74         void RemoveMode(chanrec* channel, char mc)
  75         {
  76                 unload_kludge = true;
  77                 CUList* cl = channel->GetUsers();
  78                 std::string item = extend+std::string(channel->name);
  79                 char moderemove[MAXBUF];
  80                 userrec* n = new userrec(MyInstance);
  81                 n->SetFd(FD_MAGIC_NUMBER);
  82                 for (CUList::iterator i = cl->begin(); i != cl->end(); i++)
  83                 {
  84                         if (i->second->GetExt(item, dummyptr))
  85                         {
  86                                 sprintf(moderemove,"-%c",mc);
  87                                 const char* parameters[] = { channel->name, moderemove, i->second->nick };
  88                                 MyInstance->SendMode(parameters, 3, n);
  89                         }
  90                 }
  91                 delete n;
  92                 unload_kludge = false;
  93         }
  94
  95         void DisplayList(userrec* user, chanrec* channel)
  96         {
  97                 CUList* cl = channel->GetUsers();
  98                 std::string item = extend+std::string(channel->name);
  99                 for (CUList::iterator i = cl->begin(); i != cl->end(); i++)
 100                 {
 101                         if (i->second->GetExt(item, dummyptr))
 102                         {
 103                                 user->WriteServ("%d %s %s %s", list, user->nick, channel->name,i->second->nick);
 104                         }
 105                 }
 106                 user->WriteServ("%d %s %s :End of channel %s list", end, user->nick, channel->name, type.c_str());
 107         }
 108
 109         userrec* FindAndVerify(std::string &parameter, chanrec* channel)
 110         {
 111                 userrec* theuser = MyInstance->FindNick(parameter);
 112                 if ((!theuser) || (!channel->HasUser(theuser)))
 113                 {
 114                         parameter = "";
 115                         return NULL;
 116                 }
 117                 return theuser;
 118         }
 119
 120         ModeAction HandleChange(userrec* source, userrec* theuser, bool adding, chanrec* channel, std::string &parameter)
 121         {
 122                 std::string item = extend+std::string(channel->name);
 123
 124                 if (adding)
 125                 {
 126                         if (!theuser->GetExt(item, dummyptr))
 127                         {
 128                                 theuser->Extend(item, fakevalue);
 129                                 parameter = theuser->nick;
 130                                 return MODEACTION_ALLOW;
 131                         }
 132                 }
 133                 else
 134                 {
 135                         if (theuser->GetExt(item, dummyptr))
 136                         {
 137                                 theuser->Shrink(item);
 138                                 parameter = theuser->nick;
 139                                 return MODEACTION_ALLOW;
 140                         }
 141                 }
 142                 return MODEACTION_DENY;
 143         }
 144 };
 145
 146 class ChanFounder : public ModeHandler, public FounderProtectBase
 147 {
 148         char* dummyptr;
 149  public:
 150         ChanFounder(InspIRCd* Instance, bool using_prefixes)
 151                 : ModeHandler(Instance, 'q', 1, 1, true, MODETYPE_CHANNEL, false, using_prefixes ? '~' : 0),
 152                   FounderProtectBase(Instance, "cm_founder_", "founder", 386, 387) { }
 153
 154         unsigned int GetPrefixRank()
 155         {
 156                 return FOUNDER_VALUE;
 157         }
 158
 159         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
 160         {
 161                 return FounderProtectBase::ModeSet(source, dest, channel, parameter);
 162         }
 163
 164         void RemoveMode(chanrec* channel)
 165         {
 166                 FounderProtectBase::RemoveMode(channel, this->GetModeChar());
 167         }
 168
 169         void RemoveMode(userrec* user)
 170         {
 171         }
 172
 173         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 174         {
 175                 userrec* theuser = FounderProtectBase::FindAndVerify(parameter, channel);
 176
 177                 if (!theuser)
 178                 {
 179                         return MODEACTION_DENY;
 180                 }
 181
 182                  // source is a server, or ulined, we'll let them +-q the user.
 183                 if ((unload_kludge) || (ServerInstance->ULine(source->nick)) || (ServerInstance->ULine(source->server)) || (!*source->server) || (!IS_LOCAL(source)))
 184                 {
 185                         return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
 186                 }
 187                 else
 188                 {
 189                         // whoops, someones being naughty!
 190                         source->WriteServ("468 %s %s :Only servers may set channel mode +q",source->nick, channel->name);
 191                         parameter = "";
 192                         return MODEACTION_DENY;
 193                 }
 194         }
 195
 196         void DisplayList(userrec* user, chanrec* channel)
 197         {
 198                 FounderProtectBase::DisplayList(user,channel);
 199         }
 200 };
 201
 202 class ChanProtect : public ModeHandler, public FounderProtectBase
 203 {
 204         char* dummyptr;
 205  public:
 206         ChanProtect(InspIRCd* Instance, bool using_prefixes)
 207                 : ModeHandler(Instance, 'a', 1, 1, true, MODETYPE_CHANNEL, false, using_prefixes ? '&' : 0),
 208                   FounderProtectBase(Instance,"cm_protect_","protected user", 388, 389) { }
 209
 210         unsigned int GetPrefixRank()
 211         {
 212                 return PROTECT_VALUE;
 213         }
 214
 215         ModePair ModeSet(userrec* source, userrec* dest, chanrec* channel, const std::string &parameter)
 216         {
 217                 return FounderProtectBase::ModeSet(source, dest, channel, parameter);
 218         }
 219
 220         void RemoveMode(chanrec* channel)
 221         {
 222                 FounderProtectBase::RemoveMode(channel, this->GetModeChar());
 223         }
 224
 225         void RemoveMode(userrec* user)
 226         {
 227         }
 228
 229         ModeAction OnModeChange(userrec* source, userrec* dest, chanrec* channel, std::string &parameter, bool adding)
 230         {
 231                 userrec* theuser = FounderProtectBase::FindAndVerify(parameter, channel);
 232
 233                 if (!theuser)
 234                         return MODEACTION_DENY;
 235
 236                 std::string founder = "cm_founder_"+std::string(channel->name);
 237
 238                 // source has +q, is a server, or ulined, we'll let them +-a the user.
 239                 if ((unload_kludge) || (ServerInstance->ULine(source->nick)) || (ServerInstance->ULine(source->server)) || (!*source->server) || (source->GetExt(founder,dummyptr)) || (!IS_LOCAL(source)))
 240                 {
 241                         return FounderProtectBase::HandleChange(source, theuser, adding, channel, parameter);
 242                 }
 243                 else
 244                 {
 245                         // bzzzt, wrong answer!
 246                         source->WriteServ("482 %s %s :You are not a channel founder",source->nick, channel->name);
 247                         return MODEACTION_DENY;
 248                 }
 249         }
 250
 251         virtual void DisplayList(userrec* user, chanrec* channel)
 252         {
 253                 FounderProtectBase::DisplayList(user, channel);
 254         }
 255
 256 };
 257
 258 class ModuleChanProtect : public Module
 259 {
 260
 261         bool FirstInGetsFounder;
 262         bool QAPrefixes;
 263         ChanProtect* cp;
 264         ChanFounder* cf;
 265         char* dummyptr;
 266
 267  public:
 268
 269         ModuleChanProtect(InspIRCd* Me) : Module::Module(Me)
 270         {
 271                 /* Load config stuff */
 272                 OnRehash("");
 273
 274                 /* Initialise module variables */
 275
 276                 cp = new ChanProtect(ServerInstance,QAPrefixes);
 277                 cf = new ChanFounder(ServerInstance,QAPrefixes);
 278
 279                 ServerInstance->AddMode(cp, 'a');
 280                 ServerInstance->AddMode(cf, 'q');
 281         }
 282
 283         void Implements(char* List)
 284         {
 285                 List[I_OnUserKick] = List[I_OnUserPart] = List[I_OnRehash] = List[I_OnUserJoin] = List[I_OnAccessCheck] = List[I_OnSyncChannel] = 1;
 286         }
 287
 288         virtual void OnUserKick(userrec* source, userrec* user, chanrec* chan, const std::string &reason)
 289         {
 290                 // FIX: when someone gets kicked from a channel we must remove their Extensibles!
 291                 user->Shrink("cm_founder_"+std::string(chan->name));
 292                 user->Shrink("cm_protect_"+std::string(chan->name));
 293         }
 294
 295         virtual void OnUserPart(userrec* user, chanrec* channel, const std::string &partreason)
 296         {
 297                 // FIX: when someone parts a channel we must remove their Extensibles!
 298                 user->Shrink("cm_founder_"+std::string(channel->name));
 299                 user->Shrink("cm_protect_"+std::string(channel->name));
 300         }
 301
 302         virtual void OnRehash(const std::string &parameter)
 303         {
 304                 /* Create a configreader class and read our flag,
 305                  * in old versions this was heap-allocated and the
 306                  * object was kept between rehashes...now we just
 307                  * stack-allocate it locally.
 308                  */
 309                 ConfigReader Conf(ServerInstance);
 310
 311                 FirstInGetsFounder = Conf.ReadFlag("options","noservices",0);
 312                 QAPrefixes = Conf.ReadFlag("options","qaprefixes",0);
 313         }
 314
 315         virtual void OnUserJoin(userrec* user, chanrec* channel)
 316         {
 317                 // if the user is the first user into the channel, mark them as the founder, but only if
 318                 // the config option for it is set
 319                 if (FirstInGetsFounder)
 320                 {
 321                         if (channel->GetUserCounter() == 1)
 322                         {
 323                                 // we're using Extensible::Extend to add data into user objects.
 324                                 // this way is best as it adds data thats accessible to other modules
 325                                 // (so long as you document your code properly) without breaking anything
 326                                 // because its encapsulated neatly in a map.
 327
 328                                 // Change requested by katsklaw... when the first in is set to get founder,
 329                                 // to make it clearer that +q has been given, send that one user the +q notice
 330                                 // so that their client's syncronization and their sanity are left intact.
 331                                 user->WriteServ("MODE %s +q %s",channel->name,user->nick);
 332                                 if (user->Extend("cm_founder_"+std::string(channel->name),fakevalue))
 333                                 {
 334                                         ServerInstance->Log(DEBUG,"Marked user "+std::string(user->nick)+" as founder for "+std::string(channel->name));
 335                                 }
 336                         }
 337                 }
 338         }
 339
 340         virtual int OnAccessCheck(userrec* source,userrec* dest,chanrec* channel,int access_type)
 341         {
 342                 // here we perform access checks, this is the important bit that actually stops kicking/deopping
 343                 // etc of protected users. There are many types of access check, we're going to handle
 344                 // a relatively small number of them relevent to our module using a switch statement.
 345
 346                 ServerInstance->Log(DEBUG,"chanprotect OnAccessCheck %d",access_type);
 347                 // don't allow action if:
 348                 // (A) Theyre founder (no matter what)
 349                 // (B) Theyre protected, and you're not
 350                 // always allow the action if:
 351                 // (A) The source is ulined
 352
 353
 354                 // firstly, if a ulined nick, or a server, is setting the mode, then allow them to set the mode
 355                 // without any access checks, we're not worthy :p
 356                 if ((ServerInstance->ULine(source->nick)) || (ServerInstance->ULine(source->server)) || (!*source->server))
 357                 {
 358                         return ACR_ALLOW;
 359                 }
 360
 361                 std::string founder = "cm_founder_"+std::string(channel->name);
 362                 std::string protect = "cm_protect_"+std::string(channel->name);
 363
 364                 switch (access_type)
 365                 {
 366                         // a user has been deopped. Do we let them? hmmm...
 367                         case AC_DEOP:
 368                                 ServerInstance->Log(DEBUG,"OnAccessCheck AC_DEOP");
 369                                 if (dest->GetExt(founder,dummyptr))
 370                                 {
 371                                         ServerInstance->Log(DEBUG,"Has %s",founder.c_str());
 372                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't deop "+std::string(dest->nick)+" as they're a channel founder");
 373                                         return ACR_DENY;
 374                                 }
 375                                 else
 376                                 {
 377                                         ServerInstance->Log(DEBUG,"Doesnt have %s",founder.c_str());
 378                                 }
 379                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 380                                 {
 381                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't deop "+std::string(dest->nick)+" as they're protected (+a)");
 382                                         return ACR_DENY;
 383                                 }
 384                         break;
 385
 386                         // a user is being kicked. do we chop off the end of the army boot?
 387                         case AC_KICK:
 388                                 ServerInstance->Log(DEBUG,"OnAccessCheck AC_KICK");
 389                                 if (dest->GetExt(founder,dummyptr))
 390                                 {
 391                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't kick "+std::string(dest->nick)+" as they're a channel founder");
 392                                         return ACR_DENY;
 393                                 }
 394                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 395                                 {
 396                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't kick "+std::string(dest->nick)+" as they're protected (+a)");
 397                                         return ACR_DENY;
 398                                 }
 399                         break;
 400
 401                         // a user is being dehalfopped. Yes, we do disallow -h of a +ha user
 402                         case AC_DEHALFOP:
 403                                 if (dest->GetExt(founder,dummyptr))
 404                                 {
 405                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't de-halfop "+std::string(dest->nick)+" as they're a channel founder");
 406                                         return ACR_DENY;
 407                                 }
 408                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 409                                 {
 410                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't de-halfop "+std::string(dest->nick)+" as they're protected (+a)");
 411                                         return ACR_DENY;
 412                                 }
 413                         break;
 414
 415                         // same with devoice.
 416                         case AC_DEVOICE:
 417                                 if (dest->GetExt(founder,dummyptr))
 418                                 {
 419                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't devoice "+std::string(dest->nick)+" as they're a channel founder");
 420                                         return ACR_DENY;
 421                                 }
 422                                 if ((dest->GetExt(protect,dummyptr)) && (!source->GetExt(protect,dummyptr)))
 423                                 {
 424                                         source->WriteServ("484 "+std::string(source->nick)+" "+std::string(channel->name)+" :Can't devoice "+std::string(dest->nick)+" as they're protected (+a)");
 425                                         return ACR_DENY;
 426                                 }
 427                         break;
 428                 }
 429
 430                 // we dont know what this access check is, or dont care. just carry on, nothing to see here.
 431                 return ACR_DEFAULT;
 432         }
 433
 434         virtual ~ModuleChanProtect()
 435         {
 436                 ServerInstance->Modes->DelMode(cp);
 437                 ServerInstance->Modes->DelMode(cf);
 438                 DELETE(cp);
 439                 DELETE(cf);
 440         }
 441
 442         virtual Version GetVersion()
 443         {
 444                 return Version(1, 0, 0, 0, VF_COMMON | VF_VENDOR);
 445         }
 446
 447         virtual void OnSyncChannel(chanrec* chan, Module* proto, void* opaque)
 448         {
 449                 // this is called when the server is linking into a net and wants to sync channel data.
 450                 // we should send our mode changes for the channel here to ensure that other servers
 451                 // know whos +q/+a on the channel.
 452                 CUList* cl = chan->GetUsers();
 453                 string_list commands;
 454                 std::string founder = "cm_founder_"+std::string(chan->name);
 455                 std::string protect = "cm_protect_"+std::string(chan->name);
 456                 for (CUList::iterator i = cl->begin(); i != cl->end(); i++)
 457                 {
 458                         if (i->second->GetExt(founder,dummyptr))
 459                         {
 460                                 proto->ProtoSendMode(opaque,TYPE_CHANNEL,chan,"+q "+std::string(i->second->nick));
 461                         }
 462                         if (i->second->GetExt(protect,dummyptr))
 463                         {
 464                                 proto->ProtoSendMode(opaque,TYPE_CHANNEL,chan,"+a "+std::string(i->second->nick));
 465                         }
 466                 }
 467         }
 468
 469 };
 470
 471
 472 class ModuleChanProtectFactory : public ModuleFactory
 473 {
 474  public:
 475         ModuleChanProtectFactory()
 476         {
 477         }
 478
 479         ~ModuleChanProtectFactory()
 480         {
 481         }
 482
 483         virtual Module * CreateModule(InspIRCd* Me)
 484         {
 485                 return new ModuleChanProtect(Me);
 486         }
 487
 488 };
 489
 490
 491 extern "C" void * init_module( void )
 492 {
 493         return new ModuleChanProtectFactory;
 494 }