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