src/modules/m_filter.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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 #include "xline.h"
  16 #include "m_regex.h"
  17
  18 /* $ModDesc: Text (spam) filtering */
  19
  20 static std::string RegexEngine = "";
  21 static Module* rxengine = NULL;
  22
  23 enum FilterFlags
  24 {
  25         FLAG_PART = 2,
  26         FLAG_QUIT = 4,
  27         FLAG_PRIVMSG = 8,
  28         FLAG_NOTICE = 16
  29 };
  30
  31 class FilterResult : public classbase
  32 {
  33  public:
  34         std::string freeform;
  35         std::string reason;
  36         std::string action;
  37         long gline_time;
  38         std::string flags;
  39
  40         bool flag_no_opers;
  41         bool flag_part_message;
  42         bool flag_quit_message;
  43         bool flag_privmsg;
  44         bool flag_notice;
  45
  46         FilterResult(const std::string free, const std::string &rea, const std::string &act, long gt, const std::string &fla) :
  47                         freeform(free), reason(rea), action(act), gline_time(gt), flags(fla)
  48         {
  49                 this->FillFlags(fla);
  50         }
  51
  52         int FillFlags(const std::string &fl)
  53         {
  54                 flags = fl;
  55                 flag_no_opers = flag_part_message = flag_quit_message = flag_privmsg = flag_notice = false;
  56                 size_t x = 0;
  57
  58                 for (std::string::const_iterator n = flags.begin(); n != flags.end(); ++n, ++x)
  59                 {
  60                         switch (*n)
  61                         {
  62                                 case 'o':
  63                                         flag_no_opers = true;
  64                                 break;
  65                                 case 'P':
  66                                         flag_part_message = true;
  67                                 break;
  68                                 case 'q':
  69                                         flag_quit_message = true;
  70                                 break;
  71                                 case 'p':
  72                                         flag_privmsg = true;
  73                                 break;
  74                                 case 'n':
  75                                         flag_notice = true;
  76                                 break;
  77                                 case '*':
  78                                         flag_no_opers = flag_part_message = flag_quit_message =
  79                                                 flag_privmsg = flag_notice = true;
  80                                 break;
  81                                 default:
  82                                         return x;
  83                                 break;
  84                         }
  85                 }
  86                 return 0;
  87         }
  88
  89         FilterResult()
  90         {
  91         }
  92
  93         virtual ~FilterResult()
  94         {
  95         }
  96 };
  97
  98 class FilterBase;
  99
 100 class CommandFilter : public Command
 101 {
 102         FilterBase* Base;
 103  public:
 104         CommandFilter(FilterBase* f)
 105                 : Command(reinterpret_cast<Module*>(f), "FILTER", 1, 5), Base(f)
 106         {
 107                 flags_needed = 'o';
 108                 this->syntax = "<filter-definition> <action> <flags> [<gline-duration>] :<reason>";
 109         }
 110         CmdResult Handle(const std::vector<std::string>&, User*);
 111
 112         void TooFewParams(User* user, const std::string &extra_text)
 113         {
 114                 user->WriteServ("NOTICE %s :*** Not enough parameters%s", user->nick.c_str(), extra_text.c_str());
 115         }
 116
 117         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
 118         {
 119                 return ROUTE_BROADCAST;
 120         }
 121 };
 122
 123 class FilterBase : public Module
 124 {
 125         CommandFilter filtcommand;
 126         int flags;
 127 protected:
 128         std::vector<std::string> exemptfromfilter; // List of channel names excluded from filtering.
 129  public:
 130         FilterBase();
 131         virtual ~FilterBase();
 132         virtual ModResult OnUserPreMessage(User* user,void* dest,int target_type, std::string &text, char status, CUList &exempt_list);
 133         virtual FilterResult* FilterMatch(User* user, const std::string &text, int flags) = 0;
 134         virtual bool DeleteFilter(const std::string &freeform) = 0;
 135         virtual void SyncFilters(Module* proto, void* opaque) = 0;
 136         virtual void SendFilter(Module* proto, void* opaque, FilterResult* iter);
 137         virtual std::pair<bool, std::string> AddFilter(const std::string &freeform, const std::string &type, const std::string &reason, long duration, const std::string &flags) = 0;
 138         virtual ModResult OnUserPreNotice(User* user,void* dest,int target_type, std::string &text, char status, CUList &exempt_list);
 139         virtual void OnRehash(User* user);
 140         virtual Version GetVersion();
 141         std::string EncodeFilter(FilterResult* filter);
 142         FilterResult DecodeFilter(const std::string &data);
 143         virtual void OnSyncNetwork(Module* proto, void* opaque);
 144         virtual void OnDecodeMetaData(Extensible* target, const std::string &extname, const std::string &extdata);
 145         virtual ModResult OnStats(char symbol, User* user, string_list &results) = 0;
 146         virtual ModResult OnPreCommand(std::string &command, std::vector<std::string> &parameters, User *user, bool validated, const std::string &original_line);
 147         bool AppliesToMe(User* user, FilterResult* filter, int flags);
 148         void OnLoadModule(Module* mod);
 149         virtual void ReadFilters(ConfigReader &MyConf) = 0;
 150 };
 151
 152 CmdResult CommandFilter::Handle(const std::vector<std::string> &parameters, User *user)
 153 {
 154         if (parameters.size() == 1)
 155         {
 156                 /* Deleting a filter */
 157                 if (Base->DeleteFilter(parameters[0]))
 158                 {
 159                         user->WriteServ("NOTICE %s :*** Removed filter '%s'", user->nick.c_str(), parameters[0].c_str());
 160                         ServerInstance->SNO->WriteToSnoMask(IS_LOCAL(user) ? 'a' : 'A', std::string("FILTER: ")+user->nick+" removed filter '"+parameters[0]+"'");
 161                         return CMD_SUCCESS;
 162                 }
 163                 else
 164                 {
 165                         user->WriteServ("NOTICE %s :*** Filter '%s' not found in list, try /stats s.", user->nick.c_str(), parameters[0].c_str());
 166                         return CMD_FAILURE;
 167                 }
 168         }
 169         else
 170         {
 171                 /* Adding a filter */
 172                 if (parameters.size() >= 4)
 173                 {
 174                         std::string freeform = parameters[0];
 175                         std::string type = parameters[1];
 176                         std::string flags = parameters[2];
 177                         std::string reason;
 178                         long duration = 0;
 179
 180
 181                         if ((type != "gline") && (type != "none") && (type != "block") && (type != "kill") && (type != "silent"))
 182                         {
 183                                 user->WriteServ("NOTICE %s :*** Invalid filter type '%s'. Supported types are 'gline', 'none', 'block', 'silent' and 'kill'.", user->nick.c_str(), type.c_str());
 184                                 return CMD_FAILURE;
 185                         }
 186
 187                         if (type == "gline")
 188                         {
 189                                 if (parameters.size() >= 5)
 190                                 {
 191                                         duration = ServerInstance->Duration(parameters[3]);
 192                                         reason = parameters[4];
 193                                 }
 194                                 else
 195                                 {
 196                                         this->TooFewParams(user, ": When setting a gline type filter, a gline duration must be specified as the third parameter.");
 197                                         return CMD_FAILURE;
 198                                 }
 199                         }
 200                         else
 201                         {
 202                                 reason = parameters[3];
 203                         }
 204                         std::pair<bool, std::string> result = Base->AddFilter(freeform, type, reason, duration, flags);
 205                         if (result.first)
 206                         {
 207                                 user->WriteServ("NOTICE %s :*** Added filter '%s', type '%s'%s%s, flags '%s', reason: '%s'", user->nick.c_str(), freeform.c_str(),
 208                                                 type.c_str(), (duration ? ", duration " : ""), (duration ? parameters[3].c_str() : ""),
 209                                                 flags.c_str(), reason.c_str());
 210
 211                                 ServerInstance->SNO->WriteToSnoMask(IS_LOCAL(user) ? 'a' : 'A', std::string("FILTER: ")+user->nick+" added filter '"+freeform+"', type '"+type+"', "+(duration ? "duration "+parameters[3]+", " : "")+"flags '"+flags+"', reason: "+reason);
 212
 213                                 return CMD_SUCCESS;
 214                         }
 215                         else
 216                         {
 217                                 user->WriteServ("NOTICE %s :*** Filter '%s' could not be added: %s", user->nick.c_str(), freeform.c_str(), result.second.c_str());
 218                                 return CMD_FAILURE;
 219                         }
 220                 }
 221                 else
 222                 {
 223                         this->TooFewParams(user, ".");
 224                         return CMD_FAILURE;
 225                 }
 226
 227         }
 228 }
 229
 230 bool FilterBase::AppliesToMe(User* user, FilterResult* filter, int iflags)
 231 {
 232         if ((filter->flag_no_opers) && IS_OPER(user))
 233                 return false;
 234         if ((iflags & FLAG_PRIVMSG) && (!filter->flag_privmsg))
 235                 return false;
 236         if ((iflags & FLAG_NOTICE) && (!filter->flag_notice))
 237                 return false;
 238         if ((iflags & FLAG_QUIT)   && (!filter->flag_quit_message))
 239                 return false;
 240         if ((iflags & FLAG_PART)   && (!filter->flag_part_message))
 241                 return false;
 242         return true;
 243 }
 244
 245 FilterBase::FilterBase() : filtcommand(this)
 246 {
 247         ServerInstance->Modules->UseInterface("RegularExpression");
 248         ServerInstance->AddCommand(&filtcommand);
 249         Implementation eventlist[] = { I_OnPreCommand, I_OnStats, I_OnSyncNetwork, I_OnDecodeMetaData, I_OnUserPreMessage, I_OnUserPreNotice, I_OnRehash, I_OnLoadModule };
 250         ServerInstance->Modules->Attach(eventlist, this, 8);
 251 }
 252
 253 FilterBase::~FilterBase()
 254 {
 255         ServerInstance->Modules->DoneWithInterface("RegularExpression");
 256 }
 257
 258 ModResult FilterBase::OnUserPreMessage(User* user,void* dest,int target_type, std::string &text, char status, CUList &exempt_list)
 259 {
 260         if (!IS_LOCAL(user))
 261                 return MOD_RES_PASSTHRU;
 262
 263         flags = FLAG_PRIVMSG;
 264         return OnUserPreNotice(user,dest,target_type,text,status,exempt_list);
 265 }
 266
 267 ModResult FilterBase::OnUserPreNotice(User* user,void* dest,int target_type, std::string &text, char status, CUList &exempt_list)
 268 {
 269         /* Leave ulines alone */
 270         if ((ServerInstance->ULine(user->server)) || (!IS_LOCAL(user)))
 271                 return MOD_RES_PASSTHRU;
 272
 273         if (!flags)
 274                 flags = FLAG_NOTICE;
 275
 276         FilterResult* f = this->FilterMatch(user, text, flags);
 277         if (f)
 278         {
 279                 std::string target = "";
 280                 if (target_type == TYPE_USER)
 281                 {
 282                         User* t = (User*)dest;
 283                         target = std::string(t->nick);
 284                 }
 285                 else if (target_type == TYPE_CHANNEL)
 286                 {
 287                         Channel* t = (Channel*)dest;
 288                         target = std::string(t->name);
 289                         std::vector<std::string>::iterator i = find(exemptfromfilter.begin(), exemptfromfilter.end(), target);
 290                         if (i != exemptfromfilter.end()) return MOD_RES_PASSTHRU;
 291                 }
 292                 if (f->action == "block")
 293                 {
 294                         ServerInstance->SNO->WriteGlobalSno('a', std::string("FILTER: ")+user->nick+" had their message filtered, target was "+target+": "+f->reason);
 295                         if (target_type == TYPE_CHANNEL)
 296                                 user->WriteNumeric(404, "%s %s :Message to channel blocked and opers notified (%s)",user->nick.c_str(), target.c_str(), f->reason.c_str());
 297                         else
 298                                 user->WriteServ("NOTICE "+std::string(user->nick)+" :Your message to "+target+" was blocked and opers notified: "+f->reason);
 299                 }
 300                 if (f->action == "silent")
 301                 {
 302                         if (target_type == TYPE_CHANNEL)
 303                                 user->WriteNumeric(404, "%s %s :Message to channel blocked (%s)",user->nick.c_str(), target.c_str(), f->reason.c_str());
 304                         else
 305                                 user->WriteServ("NOTICE "+std::string(user->nick)+" :Your message to "+target+" was blocked: "+f->reason);
 306                 }
 307                 if (f->action == "kill")
 308                 {
 309                         ServerInstance->Users->QuitUser(user, "Filtered: " + f->reason);
 310                 }
 311                 if (f->action == "gline")
 312                 {
 313                         GLine* gl = new GLine(ServerInstance->Time(), f->gline_time, ServerInstance->Config->ServerName.c_str(), f->reason.c_str(), "*", user->GetIPString());
 314                         if (ServerInstance->XLines->AddLine(gl,NULL))
 315                         {
 316                                 ServerInstance->XLines->ApplyLines();
 317                         }
 318                         else
 319                                 delete gl;
 320                 }
 321
 322                 ServerInstance->Logs->Log("FILTER",DEFAULT,"FILTER: "+ user->nick + " had their message filtered, target was " + target + ": " + f->reason + " Action: " + f->action);
 323                 return MOD_RES_DENY;
 324         }
 325         return MOD_RES_PASSTHRU;
 326 }
 327
 328 ModResult FilterBase::OnPreCommand(std::string &command, std::vector<std::string> &parameters, User *user, bool validated, const std::string &original_line)
 329 {
 330         flags = 0;
 331         if (validated && IS_LOCAL(user))
 332         {
 333                 std::string checkline;
 334                 int replacepoint = 0;
 335                 bool parting = false;
 336
 337                 if (command == "QUIT")
 338                 {
 339                         /* QUIT with no reason: nothing to do */
 340                         if (parameters.size() < 1)
 341                                 return MOD_RES_PASSTHRU;
 342
 343                         checkline = parameters[0];
 344                         replacepoint = 0;
 345                         parting = false;
 346                         flags = FLAG_QUIT;
 347                 }
 348                 else if (command == "PART")
 349                 {
 350                         /* PART with no reason: nothing to do */
 351                         if (parameters.size() < 2)
 352                                 return MOD_RES_PASSTHRU;
 353
 354                         std::vector<std::string>::iterator i = find(exemptfromfilter.begin(), exemptfromfilter.end(), parameters[0]);
 355                         if (i != exemptfromfilter.end()) return MOD_RES_PASSTHRU;
 356                         checkline = parameters[1];
 357                         replacepoint = 1;
 358                         parting = true;
 359                         flags = FLAG_PART;
 360                 }
 361                 else
 362                         /* We're only messing with PART and QUIT */
 363                         return MOD_RES_PASSTHRU;
 364
 365                 FilterResult* f = NULL;
 366
 367                 if (flags)
 368                         f = this->FilterMatch(user, checkline, flags);
 369
 370                 if (!f)
 371                         /* PART or QUIT reason doesnt match a filter */
 372                         return MOD_RES_PASSTHRU;
 373
 374                 /* We cant block a part or quit, so instead we change the reason to 'Reason filtered' */
 375                 Command* c = ServerInstance->Parser->GetHandler(command);
 376                 if (c)
 377                 {
 378                         std::vector<std::string> params;
 379                         for (int item = 0; item < (int)parameters.size(); item++)
 380                                 params.push_back(parameters[item]);
 381                         params[replacepoint] = "Reason filtered";
 382
 383                         /* We're blocking, OR theyre quitting and its a KILL action
 384                          * (we cant kill someone whos already quitting, so filter them anyway)
 385                          */
 386                         if ((f->action == "block") || (((!parting) && (f->action == "kill"))) || (f->action == "silent"))
 387                         {
 388                                 c->Handle(params, user);
 389                                 return MOD_RES_DENY;
 390                         }
 391                         else
 392                         {
 393                                 /* Are they parting, if so, kill is applicable */
 394                                 if ((parting) && (f->action == "kill"))
 395                                 {
 396                                         user->WriteServ("NOTICE %s :*** Your PART message was filtered: %s", user->nick.c_str(), f->reason.c_str());
 397                                         ServerInstance->Users->QuitUser(user, "Filtered: " + f->reason);
 398                                 }
 399                                 if (f->action == "gline")
 400                                 {
 401                                         /* Note: We gline *@IP so that if their host doesnt resolve the gline still applies. */
 402                                         GLine* gl = new GLine(ServerInstance->Time(), f->gline_time, ServerInstance->Config->ServerName.c_str(), f->reason.c_str(), "*", user->GetIPString());
 403                                         if (ServerInstance->XLines->AddLine(gl,NULL))
 404                                         {
 405                                                 ServerInstance->XLines->ApplyLines();
 406                                         }
 407                                         else
 408                                                 delete gl;
 409                                 }
 410                                 return MOD_RES_DENY;
 411                         }
 412                 }
 413                 return MOD_RES_PASSTHRU;
 414         }
 415         return MOD_RES_PASSTHRU;
 416 }
 417
 418 void FilterBase::OnRehash(User* user)
 419 {
 420         ConfigReader MyConf;
 421         std::vector<std::string>().swap(exemptfromfilter);
 422         for (int index = 0; index < MyConf.Enumerate("exemptfromfilter"); ++index)
 423         {
 424                 std::string chan = MyConf.ReadValue("exemptfromfilter", "channel", index);
 425                 if (!chan.empty()) {
 426                         exemptfromfilter.push_back(chan);
 427                 }
 428         }
 429         std::string newrxengine = MyConf.ReadValue("filteropts", "engine", 0);
 430         if (!RegexEngine.empty())
 431         {
 432                 if (RegexEngine == newrxengine)
 433                         return;
 434
 435                 ServerInstance->SNO->WriteGlobalSno('a', "Dumping all filters due to regex engine change (was '%s', now '%s')", RegexEngine.c_str(), newrxengine.c_str());
 436                 //ServerInstance->XLines->DelAll("R");
 437         }
 438         rxengine = NULL;
 439
 440         RegexEngine = newrxengine;
 441         modulelist* ml = ServerInstance->Modules->FindInterface("RegularExpression");
 442         if (ml)
 443         {
 444                 for (modulelist::iterator i = ml->begin(); i != ml->end(); ++i)
 445                 {
 446                         if (RegexNameRequest(this, *i).result == newrxengine)
 447                         {
 448                                 ServerInstance->SNO->WriteGlobalSno('a', "Filter now using engine '%s'", RegexEngine.c_str());
 449                                 rxengine = *i;
 450                         }
 451                 }
 452         }
 453         if (!rxengine)
 454         {
 455                 ServerInstance->SNO->WriteGlobalSno('a', "WARNING: Regex engine '%s' is not loaded - Filter functionality disabled until this is corrected.", RegexEngine.c_str());
 456         }
 457 }
 458
 459 void FilterBase::OnLoadModule(Module* mod)
 460 {
 461         if (ServerInstance->Modules->ModuleHasInterface(mod, "RegularExpression"))
 462         {
 463                 std::string rxname = RegexNameRequest(this, mod).result;
 464                 if (rxname == RegexEngine)
 465                 {
 466                         rxengine = mod;
 467                         /* Force a rehash to make sure that any filters that couldnt be applied from the conf
 468                          * on startup or on load are applied right now.
 469                          */
 470                         ConfigReader Config;
 471                         ServerInstance->SNO->WriteGlobalSno('a', "Found and activated regex module '%s' for m_filter.so.", RegexEngine.c_str());
 472                         ReadFilters(Config);
 473                 }
 474         }
 475 }
 476
 477
 478 Version FilterBase::GetVersion()
 479 {
 480         return Version("Text (spam) filtering", VF_VENDOR | VF_COMMON, API_VERSION);
 481 }
 482
 483
 484 std::string FilterBase::EncodeFilter(FilterResult* filter)
 485 {
 486         std::ostringstream stream;
 487         std::string x = filter->freeform;
 488
 489         /* Hax to allow spaces in the freeform without changing the design of the irc protocol */
 490         for (std::string::iterator n = x.begin(); n != x.end(); n++)
 491                 if (*n == ' ')
 492                         *n = '\7';
 493
 494         stream << x << " " << filter->action << " " << (filter->flags.empty() ? "-" : filter->flags) << " " << filter->gline_time << " :" << filter->reason;
 495         return stream.str();
 496 }
 497
 498 FilterResult FilterBase::DecodeFilter(const std::string &data)
 499 {
 500         FilterResult res;
 501         irc::tokenstream tokens(data);
 502         tokens.GetToken(res.freeform);
 503         tokens.GetToken(res.action);
 504         tokens.GetToken(res.flags);
 505         if (res.flags == "-")
 506                 res.flags = "";
 507         res.FillFlags(res.flags);
 508         tokens.GetToken(res.gline_time);
 509         tokens.GetToken(res.reason);
 510
 511         /* Hax to allow spaces in the freeform without changing the design of the irc protocol */
 512         for (std::string::iterator n = res.freeform.begin(); n != res.freeform.end(); n++)
 513                 if (*n == '\7')
 514                         *n = ' ';
 515
 516         return res;
 517 }
 518
 519 void FilterBase::OnSyncNetwork(Module* proto, void* opaque)
 520 {
 521         this->SyncFilters(proto, opaque);
 522 }
 523
 524 void FilterBase::SendFilter(Module* proto, void* opaque, FilterResult* iter)
 525 {
 526         proto->ProtoSendMetaData(opaque, NULL, "filter", EncodeFilter(iter));
 527 }
 528
 529 void FilterBase::OnDecodeMetaData(Extensible* target, const std::string &extname, const std::string &extdata)
 530 {
 531         if ((target == NULL) && (extname == "filter"))
 532         {
 533                 FilterResult data = DecodeFilter(extdata);
 534                 this->AddFilter(data.freeform, data.action, data.reason, data.gline_time, data.flags);
 535         }
 536 }
 537
 538 class ImplFilter : public FilterResult
 539 {
 540  public:
 541         Regex* regex;
 542
 543         ImplFilter(Module* mymodule, const std::string &rea, const std::string &act, long glinetime, const std::string &pat, const std::string &flgs)
 544                 : FilterResult(pat, rea, act, glinetime, flgs)
 545         {
 546                 if (!rxengine)
 547                         throw ModuleException("Regex module implementing '"+RegexEngine+"' is not loaded!");
 548
 549                 regex = RegexFactoryRequest(mymodule, rxengine, pat).Create();
 550         }
 551
 552         ImplFilter()
 553         {
 554         }
 555 };
 556
 557 class ModuleFilter : public FilterBase
 558 {
 559         std::vector<ImplFilter> filters;
 560         const char *error;
 561         int erroffset;
 562         ImplFilter fr;
 563
 564  public:
 565         ModuleFilter()
 566         {
 567                 OnRehash(NULL);
 568         }
 569
 570         virtual ~ModuleFilter()
 571         {
 572         }
 573
 574         virtual FilterResult* FilterMatch(User* user, const std::string &text, int flgs)
 575         {
 576                 for (std::vector<ImplFilter>::iterator index = filters.begin(); index != filters.end(); index++)
 577                 {
 578                         /* Skip ones that dont apply to us */
 579                         if (!FilterBase::AppliesToMe(user, dynamic_cast<FilterResult*>(&(*index)), flgs))
 580                                 continue;
 581
 582                         //ServerInstance->Logs->Log("m_filter", DEBUG, "Match '%s' against '%s'", text.c_str(), index->freeform.c_str());
 583                         if (index->regex->Matches(text))
 584                         {
 585                                 //ServerInstance->Logs->Log("m_filter", DEBUG, "MATCH");
 586                                 fr = *index;
 587                                 if (index != filters.begin())
 588                                 {
 589                                         /* Move to head of list for efficiency */
 590                                         filters.erase(index);
 591                                         filters.insert(filters.begin(), fr);
 592                                 }
 593                                 return &fr;
 594                         }
 595                         //ServerInstance->Logs->Log("m_filter", DEBUG, "NO MATCH");
 596                 }
 597                 return NULL;
 598         }
 599
 600         virtual bool DeleteFilter(const std::string &freeform)
 601         {
 602                 for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 603                 {
 604                         if (i->freeform == freeform)
 605                         {
 606                                 delete i->regex;
 607                                 filters.erase(i);
 608                                 return true;
 609                         }
 610                 }
 611                 return false;
 612         }
 613
 614         virtual void SyncFilters(Module* proto, void* opaque)
 615         {
 616                 for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 617                 {
 618                         this->SendFilter(proto, opaque, &(*i));
 619                 }
 620         }
 621
 622         virtual std::pair<bool, std::string> AddFilter(const std::string &freeform, const std::string &type, const std::string &reason, long duration, const std::string &flgs)
 623         {
 624                 for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 625                 {
 626                         if (i->freeform == freeform)
 627                         {
 628                                 return std::make_pair(false, "Filter already exists");
 629                         }
 630                 }
 631
 632                 try
 633                 {
 634                         filters.push_back(ImplFilter(this, reason, type, duration, freeform, flgs));
 635                 }
 636                 catch (ModuleException &e)
 637                 {
 638                         ServerInstance->Logs->Log("m_filter", DEFAULT, "Error in regular expression '%s': %s", freeform.c_str(), e.GetReason());
 639                         return std::make_pair(false, e.GetReason());
 640                 }
 641                 return std::make_pair(true, "");
 642         }
 643
 644         virtual void OnRehash(User* user)
 645         {
 646                 ConfigReader MyConf;
 647                 FilterBase::OnRehash(user);
 648                 ReadFilters(MyConf);
 649         }
 650
 651         void ReadFilters(ConfigReader &MyConf)
 652         {
 653                 for (int index = 0; index < MyConf.Enumerate("keyword"); index++)
 654                 {
 655                         this->DeleteFilter(MyConf.ReadValue("keyword", "pattern", index));
 656
 657                         std::string pattern = MyConf.ReadValue("keyword", "pattern", index);
 658                         std::string reason = MyConf.ReadValue("keyword", "reason", index);
 659                         std::string action = MyConf.ReadValue("keyword", "action", index);
 660                         std::string flgs = MyConf.ReadValue("keyword", "flags", index);
 661                         long gline_time = ServerInstance->Duration(MyConf.ReadValue("keyword", "duration", index));
 662                         if (action.empty())
 663                                 action = "none";
 664                         if (flgs.empty())
 665                                 flgs = "*";
 666
 667                         try
 668                         {
 669                                 filters.push_back(ImplFilter(this, reason, action, gline_time, pattern, flgs));
 670                                 ServerInstance->Logs->Log("m_filter", DEFAULT, "Regular expression %s loaded.", pattern.c_str());
 671                         }
 672                         catch (ModuleException &e)
 673                         {
 674                                 ServerInstance->Logs->Log("m_filter", DEFAULT, "Error in regular expression '%s': %s", pattern.c_str(), e.GetReason());
 675                         }
 676                 }
 677         }
 678
 679         virtual ModResult OnStats(char symbol, User* user, string_list &results)
 680         {
 681                 if (symbol == 's')
 682                 {
 683                         std::string sn = ServerInstance->Config->ServerName;
 684                         for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 685                         {
 686                                 results.push_back(sn+" 223 "+user->nick+" :"+RegexEngine+":"+i->freeform+" "+i->flags+" "+i->action+" "+ConvToStr(i->gline_time)+" :"+i->reason);
 687                         }
 688                         for (std::vector<std::string>::iterator i = exemptfromfilter.begin(); i != exemptfromfilter.end(); ++i)
 689                         {
 690                                 results.push_back(sn+" 223 "+user->nick+" :EXEMPT "+(*i));
 691                         }
 692                 }
 693                 return MOD_RES_PASSTHRU;
 694         }
 695 };
 696
 697 MODULE_INIT(ModuleFilter)