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