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