src/modules/m_filter.cpp

   1 /*
   2  * InspIRCd -- Internet Relay Chat Daemon
   3  *
   4  *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
   5  *   Copyright (C) 2004, 2008 Craig Edwards <craigedwards@brainbox.cc>
   6  *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
   7  *   Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
   8  *
   9  * This file is part of InspIRCd.  InspIRCd is free software: you can
  10  * redistribute it and/or modify it under the terms of the GNU General Public
  11  * License as published by the Free Software Foundation, version 2.
  12  *
  13  * This program is distributed in the hope that it will be useful, but WITHOUT
  14  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
  15  * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
  16  * details.
  17  *
  18  * You should have received a copy of the GNU General Public License
  19  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  20  */
  21
  22
  23 #include "inspircd.h"
  24 #include "xline.h"
  25 #include "modules/regex.h"
  26
  27 class ModuleFilter;
  28
  29 enum FilterFlags
  30 {
  31         FLAG_PART = 2,
  32         FLAG_QUIT = 4,
  33         FLAG_PRIVMSG = 8,
  34         FLAG_NOTICE = 16
  35 };
  36
  37 enum FilterAction
  38 {
  39         FA_GLINE,
  40         FA_BLOCK,
  41         FA_SILENT,
  42         FA_KILL,
  43         FA_NONE
  44 };
  45
  46 class FilterResult
  47 {
  48  public:
  49         std::string freeform;
  50         std::string reason;
  51         FilterAction action;
  52         long gline_time;
  53
  54         bool flag_no_opers;
  55         bool flag_part_message;
  56         bool flag_quit_message;
  57         bool flag_privmsg;
  58         bool flag_notice;
  59         bool flag_strip_color;
  60
  61         FilterResult(const std::string& free, const std::string& rea, FilterAction act, long gt, const std::string& fla) :
  62                         freeform(free), reason(rea), action(act), gline_time(gt)
  63         {
  64                 this->FillFlags(fla);
  65         }
  66
  67         char FillFlags(const std::string &fl)
  68         {
  69                 flag_no_opers = flag_part_message = flag_quit_message = flag_privmsg =
  70                         flag_notice = flag_strip_color = false;
  71
  72                 for (std::string::const_iterator n = fl.begin(); n != fl.end(); ++n)
  73                 {
  74                         switch (*n)
  75                         {
  76                                 case 'o':
  77                                         flag_no_opers = true;
  78                                 break;
  79                                 case 'P':
  80                                         flag_part_message = true;
  81                                 break;
  82                                 case 'q':
  83                                         flag_quit_message = true;
  84                                 break;
  85                                 case 'p':
  86                                         flag_privmsg = true;
  87                                 break;
  88                                 case 'n':
  89                                         flag_notice = true;
  90                                 break;
  91                                 case 'c':
  92                                         flag_strip_color = true;
  93                                 break;
  94                                 case '*':
  95                                         flag_no_opers = flag_part_message = flag_quit_message =
  96                                                 flag_privmsg = flag_notice = flag_strip_color = true;
  97                                 break;
  98                                 default:
  99                                         return *n;
 100                                 break;
 101                         }
 102                 }
 103                 return 0;
 104         }
 105
 106         std::string GetFlags()
 107         {
 108                 std::string flags;
 109                 if (flag_no_opers)
 110                         flags.push_back('o');
 111                 if (flag_part_message)
 112                         flags.push_back('P');
 113                 if (flag_quit_message)
 114                         flags.push_back('q');
 115                 if (flag_privmsg)
 116                         flags.push_back('p');
 117                 if (flag_notice)
 118                         flags.push_back('n');
 119
 120                 /* Order is important here, 'c' must be the last char in the string as it is unsupported
 121                  * on < 2.0.10, and the logic in FillFlags() stops parsing when it ecounters an unknown
 122                  * character.
 123                  */
 124                 if (flag_strip_color)
 125                         flags.push_back('c');
 126
 127                 if (flags.empty())
 128                         flags.push_back('-');
 129
 130                 return flags;
 131         }
 132
 133         FilterResult()
 134         {
 135         }
 136 };
 137
 138 class CommandFilter : public Command
 139 {
 140  public:
 141         CommandFilter(Module* f)
 142                 : Command(f, "FILTER", 1, 5)
 143         {
 144                 flags_needed = 'o';
 145                 this->syntax = "<filter-definition> <action> <flags> [<gline-duration>] :<reason>";
 146         }
 147         CmdResult Handle(const std::vector<std::string>&, User*);
 148
 149         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
 150         {
 151                 return ROUTE_BROADCAST;
 152         }
 153 };
 154
 155 class ImplFilter : public FilterResult
 156 {
 157  public:
 158         Regex* regex;
 159
 160         ImplFilter(ModuleFilter* mymodule, const std::string &rea, FilterAction act, long glinetime, const std::string &pat, const std::string &flgs);
 161 };
 162
 163
 164 class ModuleFilter : public Module
 165 {
 166         bool initing;
 167         RegexFactory* factory;
 168         void FreeFilters();
 169
 170  public:
 171         CommandFilter filtcommand;
 172         dynamic_reference<RegexFactory> RegexEngine;
 173
 174         std::vector<ImplFilter> filters;
 175         int flags;
 176
 177         std::set<std::string> exemptfromfilter; // List of channel names excluded from filtering.
 178
 179         ModuleFilter();
 180         void init() CXX11_OVERRIDE;
 181         CullResult cull();
 182         ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string& text, char status, CUList& exempt_list, MessageType msgtype) CXX11_OVERRIDE;
 183         FilterResult* FilterMatch(User* user, const std::string &text, int flags);
 184         bool DeleteFilter(const std::string &freeform);
 185         std::pair<bool, std::string> AddFilter(const std::string &freeform, FilterAction type, const std::string &reason, long duration, const std::string &flags);
 186         void OnRehash(User* user) CXX11_OVERRIDE;
 187         Version GetVersion() CXX11_OVERRIDE;
 188         std::string EncodeFilter(FilterResult* filter);
 189         FilterResult DecodeFilter(const std::string &data);
 190         void OnSyncNetwork(Module* proto, void* opaque) CXX11_OVERRIDE;
 191         void OnDecodeMetaData(Extensible* target, const std::string &extname, const std::string &extdata) CXX11_OVERRIDE;
 192         ModResult OnStats(char symbol, User* user, string_list &results) CXX11_OVERRIDE;
 193         ModResult OnPreCommand(std::string &command, std::vector<std::string> &parameters, LocalUser *user, bool validated, const std::string &original_line) CXX11_OVERRIDE;
 194         void OnUnloadModule(Module* mod) CXX11_OVERRIDE;
 195         bool AppliesToMe(User* user, FilterResult* filter, int flags);
 196         void ReadFilters();
 197         static bool StringToFilterAction(const std::string& str, FilterAction& fa);
 198         static std::string FilterActionToString(FilterAction fa);
 199 };
 200
 201 CmdResult CommandFilter::Handle(const std::vector<std::string> &parameters, User *user)
 202 {
 203         if (parameters.size() == 1)
 204         {
 205                 /* Deleting a filter */
 206                 Module *me = creator;
 207                 if (static_cast<ModuleFilter *>(me)->DeleteFilter(parameters[0]))
 208                 {
 209                         user->WriteNotice("*** Removed filter '" + parameters[0] + "'");
 210                         ServerInstance->SNO->WriteToSnoMask(IS_LOCAL(user) ? 'a' : 'A', "FILTER: "+user->nick+" removed filter '"+parameters[0]+"'");
 211                         return CMD_SUCCESS;
 212                 }
 213                 else
 214                 {
 215                         user->WriteNotice("*** Filter '" + parameters[0] + "' not found in list, try /stats s.");
 216                         return CMD_FAILURE;
 217                 }
 218         }
 219         else
 220         {
 221                 /* Adding a filter */
 222                 if (parameters.size() >= 4)
 223                 {
 224                         const std::string& freeform = parameters[0];
 225                         FilterAction type;
 226                         const std::string& flags = parameters[2];
 227                         unsigned int reasonindex;
 228                         long duration = 0;
 229
 230                         if (!ModuleFilter::StringToFilterAction(parameters[1], type))
 231                         {
 232                                 user->WriteNotice("*** Invalid filter type '" + parameters[1] + "'. Supported types are 'gline', 'none', 'block', 'silent' and 'kill'.");
 233                                 return CMD_FAILURE;
 234                         }
 235
 236                         if (type == FA_GLINE)
 237                         {
 238                                 if (parameters.size() >= 5)
 239                                 {
 240                                         duration = InspIRCd::Duration(parameters[3]);
 241                                         reasonindex = 4;
 242                                 }
 243                                 else
 244                                 {
 245                                         user->WriteNotice("*** Not enough parameters: When setting a gline type filter, a gline duration must be specified as the third parameter.");
 246                                         return CMD_FAILURE;
 247                                 }
 248                         }
 249                         else
 250                         {
 251                                 reasonindex = 3;
 252                         }
 253
 254                         Module *me = creator;
 255                         std::pair<bool, std::string> result = static_cast<ModuleFilter *>(me)->AddFilter(freeform, type, parameters[reasonindex], duration, flags);
 256                         if (result.first)
 257                         {
 258                                 user->WriteNotice("*** Added filter '" + freeform + "', type '" + parameters[1] + "'" +
 259                                         (duration ? ", duration " +  parameters[3] : "") + ", flags '" + flags + "', reason: '" +
 260                                         parameters[reasonindex] + "'");
 261
 262                                 ServerInstance->SNO->WriteToSnoMask(IS_LOCAL(user) ? 'a' : 'A', "FILTER: "+user->nick+" added filter '"+freeform+"', type '"+parameters[1]+"', "+(duration ? "duration "+parameters[3]+", " : "")+"flags '"+flags+"', reason: "+parameters[reasonindex]);
 263
 264                                 return CMD_SUCCESS;
 265                         }
 266                         else
 267                         {
 268                                 user->WriteNotice("*** Filter '" + freeform + "' could not be added: " + result.second);
 269                                 return CMD_FAILURE;
 270                         }
 271                 }
 272                 else
 273                 {
 274                         user->WriteNotice("*** Not enough parameters.");
 275                         return CMD_FAILURE;
 276                 }
 277
 278         }
 279 }
 280
 281 bool ModuleFilter::AppliesToMe(User* user, FilterResult* filter, int iflags)
 282 {
 283         if ((filter->flag_no_opers) && user->IsOper())
 284                 return false;
 285         if ((iflags & FLAG_PRIVMSG) && (!filter->flag_privmsg))
 286                 return false;
 287         if ((iflags & FLAG_NOTICE) && (!filter->flag_notice))
 288                 return false;
 289         if ((iflags & FLAG_QUIT)   && (!filter->flag_quit_message))
 290                 return false;
 291         if ((iflags & FLAG_PART)   && (!filter->flag_part_message))
 292                 return false;
 293         return true;
 294 }
 295
 296 ModuleFilter::ModuleFilter()
 297         : initing(true), filtcommand(this), RegexEngine(this, "regex")
 298 {
 299 }
 300
 301 void ModuleFilter::init()
 302 {
 303         ServerInstance->Modules->AddService(filtcommand);
 304         OnRehash(NULL);
 305 }
 306
 307 CullResult ModuleFilter::cull()
 308 {
 309         FreeFilters();
 310         return Module::cull();
 311 }
 312
 313 void ModuleFilter::FreeFilters()
 314 {
 315         for (std::vector<ImplFilter>::const_iterator i = filters.begin(); i != filters.end(); ++i)
 316                 delete i->regex;
 317
 318         filters.clear();
 319 }
 320
 321 ModResult ModuleFilter::OnUserPreMessage(User* user, void* dest, int target_type, std::string& text, char status, CUList& exempt_list, MessageType msgtype)
 322 {
 323         /* Leave ulines alone */
 324         if ((ServerInstance->ULine(user->server)) || (!IS_LOCAL(user)))
 325                 return MOD_RES_PASSTHRU;
 326
 327         flags = (msgtype == MSG_PRIVMSG) ? FLAG_PRIVMSG : FLAG_NOTICE;
 328
 329         FilterResult* f = this->FilterMatch(user, text, flags);
 330         if (f)
 331         {
 332                 std::string target;
 333                 if (target_type == TYPE_USER)
 334                 {
 335                         User* t = (User*)dest;
 336                         target = t->nick;
 337                 }
 338                 else if (target_type == TYPE_CHANNEL)
 339                 {
 340                         Channel* t = (Channel*)dest;
 341                         if (exemptfromfilter.find(t->name) != exemptfromfilter.end())
 342                                 return MOD_RES_PASSTHRU;
 343
 344                         target = t->name;
 345                 }
 346                 if (f->action == FA_BLOCK)
 347                 {
 348                         ServerInstance->SNO->WriteGlobalSno('a', "FILTER: "+user->nick+" had their message filtered, target was "+target+": "+f->reason);
 349                         if (target_type == TYPE_CHANNEL)
 350                                 user->WriteNumeric(404, "%s %s :Message to channel blocked and opers notified (%s)",user->nick.c_str(), target.c_str(), f->reason.c_str());
 351                         else
 352                                 user->WriteNotice("Your message to "+target+" was blocked and opers notified: "+f->reason);
 353                 }
 354                 else if (f->action == FA_SILENT)
 355                 {
 356                         if (target_type == TYPE_CHANNEL)
 357                                 user->WriteNumeric(404, "%s %s :Message to channel blocked (%s)",user->nick.c_str(), target.c_str(), f->reason.c_str());
 358                         else
 359                                 user->WriteNotice("Your message to "+target+" was blocked: "+f->reason);
 360                 }
 361                 else if (f->action == FA_KILL)
 362                 {
 363                         ServerInstance->Users->QuitUser(user, "Filtered: " + f->reason);
 364                 }
 365                 else if (f->action == FA_GLINE)
 366                 {
 367                         GLine* gl = new GLine(ServerInstance->Time(), f->gline_time, ServerInstance->Config->ServerName.c_str(), f->reason.c_str(), "*", user->GetIPString());
 368                         if (ServerInstance->XLines->AddLine(gl,NULL))
 369                         {
 370                                 ServerInstance->XLines->ApplyLines();
 371                         }
 372                         else
 373                                 delete gl;
 374                 }
 375
 376                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, user->nick + " had their message filtered, target was " + target + ": " + f->reason + " Action: " + ModuleFilter::FilterActionToString(f->action));
 377                 return MOD_RES_DENY;
 378         }
 379         return MOD_RES_PASSTHRU;
 380 }
 381
 382 ModResult ModuleFilter::OnPreCommand(std::string &command, std::vector<std::string> &parameters, LocalUser *user, bool validated, const std::string &original_line)
 383 {
 384         if (validated && IS_LOCAL(user))
 385         {
 386                 flags = 0;
 387                 bool parting;
 388
 389                 if (command == "QUIT")
 390                 {
 391                         /* QUIT with no reason: nothing to do */
 392                         if (parameters.size() < 1)
 393                                 return MOD_RES_PASSTHRU;
 394
 395                         parting = false;
 396                         flags = FLAG_QUIT;
 397                 }
 398                 else if (command == "PART")
 399                 {
 400                         /* PART with no reason: nothing to do */
 401                         if (parameters.size() < 2)
 402                                 return MOD_RES_PASSTHRU;
 403
 404                         if (exemptfromfilter.find(parameters[0]) != exemptfromfilter.end())
 405                                 return MOD_RES_PASSTHRU;
 406
 407                         parting = true;
 408                         flags = FLAG_PART;
 409                 }
 410                 else
 411                         /* We're only messing with PART and QUIT */
 412                         return MOD_RES_PASSTHRU;
 413
 414                 FilterResult* f = this->FilterMatch(user, parameters[parting ? 1 : 0], flags);
 415                 if (!f)
 416                         /* PART or QUIT reason doesnt match a filter */
 417                         return MOD_RES_PASSTHRU;
 418
 419                 /* We cant block a part or quit, so instead we change the reason to 'Reason filtered' */
 420                 parameters[parting ? 1 : 0] = "Reason filtered";
 421
 422                 /* We're blocking, OR theyre quitting and its a KILL action
 423                  * (we cant kill someone whos already quitting, so filter them anyway)
 424                  */
 425                 if ((f->action == FA_BLOCK) || (((!parting) && (f->action == FA_KILL))) || (f->action == FA_SILENT))
 426                 {
 427                         return MOD_RES_PASSTHRU;
 428                 }
 429                 else
 430                 {
 431                         /* Are they parting, if so, kill is applicable */
 432                         if ((parting) && (f->action == FA_KILL))
 433                         {
 434                                 user->WriteNotice("*** Your PART message was filtered: " + f->reason);
 435                                 ServerInstance->Users->QuitUser(user, "Filtered: " + f->reason);
 436                         }
 437                         if (f->action == FA_GLINE)
 438                         {
 439                                 /* Note: We gline *@IP so that if their host doesnt resolve the gline still applies. */
 440                                 GLine* gl = new GLine(ServerInstance->Time(), f->gline_time, ServerInstance->Config->ServerName.c_str(), f->reason.c_str(), "*", user->GetIPString());
 441                                 if (ServerInstance->XLines->AddLine(gl,NULL))
 442                                 {
 443                                         ServerInstance->XLines->ApplyLines();
 444                                 }
 445                                 else
 446                                         delete gl;
 447                         }
 448                         return MOD_RES_DENY;
 449                 }
 450         }
 451         return MOD_RES_PASSTHRU;
 452 }
 453
 454 void ModuleFilter::OnRehash(User* user)
 455 {
 456         ConfigTagList tags = ServerInstance->Config->ConfTags("exemptfromfilter");
 457         exemptfromfilter.clear();
 458         for (ConfigIter i = tags.first; i != tags.second; ++i)
 459         {
 460                 std::string chan = i->second->getString("channel");
 461                 if (!chan.empty())
 462                         exemptfromfilter.insert(chan);
 463         }
 464
 465         std::string newrxengine = ServerInstance->Config->ConfValue("filteropts")->getString("engine");
 466
 467         factory = RegexEngine ? (RegexEngine.operator->()) : NULL;
 468
 469         if (newrxengine.empty())
 470                 RegexEngine.SetProvider("regex");
 471         else
 472                 RegexEngine.SetProvider("regex/" + newrxengine);
 473
 474         if (!RegexEngine)
 475         {
 476                 if (newrxengine.empty())
 477                         ServerInstance->SNO->WriteGlobalSno('a', "WARNING: No regex engine loaded - Filter functionality disabled until this is corrected.");
 478                 else
 479                         ServerInstance->SNO->WriteGlobalSno('a', "WARNING: Regex engine '%s' is not loaded - Filter functionality disabled until this is corrected.", newrxengine.c_str());
 480
 481                 initing = false;
 482                 FreeFilters();
 483                 return;
 484         }
 485
 486         if ((!initing) && (RegexEngine.operator->() != factory))
 487         {
 488                 ServerInstance->SNO->WriteGlobalSno('a', "Dumping all filters due to regex engine change");
 489                 FreeFilters();
 490         }
 491
 492         initing = false;
 493         ReadFilters();
 494 }
 495
 496 Version ModuleFilter::GetVersion()
 497 {
 498         return Version("Text (spam) filtering", VF_VENDOR | VF_COMMON, RegexEngine ? RegexEngine->name : "");
 499 }
 500
 501 std::string ModuleFilter::EncodeFilter(FilterResult* filter)
 502 {
 503         std::ostringstream stream;
 504         std::string x = filter->freeform;
 505
 506         /* Hax to allow spaces in the freeform without changing the design of the irc protocol */
 507         for (std::string::iterator n = x.begin(); n != x.end(); n++)
 508                 if (*n == ' ')
 509                         *n = '\7';
 510
 511         stream << x << " " << FilterActionToString(filter->action) << " " << filter->GetFlags() << " " << filter->gline_time << " :" << filter->reason;
 512         return stream.str();
 513 }
 514
 515 FilterResult ModuleFilter::DecodeFilter(const std::string &data)
 516 {
 517         std::string filteraction;
 518         FilterResult res;
 519         irc::tokenstream tokens(data);
 520         tokens.GetToken(res.freeform);
 521         tokens.GetToken(filteraction);
 522         if (!StringToFilterAction(filteraction, res.action))
 523                 throw ModuleException("Invalid action: " + filteraction);
 524
 525         std::string filterflags;
 526         tokens.GetToken(filterflags);
 527         char c = res.FillFlags(filterflags);
 528         if (c != 0)
 529                 throw ModuleException("Invalid flag: '" + std::string(1, c) + "'");
 530
 531         tokens.GetToken(res.gline_time);
 532         tokens.GetToken(res.reason);
 533
 534         /* Hax to allow spaces in the freeform without changing the design of the irc protocol */
 535         for (std::string::iterator n = res.freeform.begin(); n != res.freeform.end(); n++)
 536                 if (*n == '\7')
 537                         *n = ' ';
 538
 539         return res;
 540 }
 541
 542 void ModuleFilter::OnSyncNetwork(Module* proto, void* opaque)
 543 {
 544         for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); ++i)
 545         {
 546                 proto->ProtoSendMetaData(opaque, NULL, "filter", EncodeFilter(&(*i)));
 547         }
 548 }
 549
 550 void ModuleFilter::OnDecodeMetaData(Extensible* target, const std::string &extname, const std::string &extdata)
 551 {
 552         if ((target == NULL) && (extname == "filter"))
 553         {
 554                 try
 555                 {
 556                         FilterResult data = DecodeFilter(extdata);
 557                         this->AddFilter(data.freeform, data.action, data.reason, data.gline_time, data.GetFlags());
 558                 }
 559                 catch (ModuleException& e)
 560                 {
 561                         ServerInstance->Logs->Log(MODNAME, LOG_DEBUG, "Error when unserializing filter: " + std::string(e.GetReason()));
 562                 }
 563         }
 564 }
 565
 566 ImplFilter::ImplFilter(ModuleFilter* mymodule, const std::string &rea, FilterAction act, long glinetime, const std::string &pat, const std::string &flgs)
 567                 : FilterResult(pat, rea, act, glinetime, flgs)
 568 {
 569         if (!mymodule->RegexEngine)
 570                 throw ModuleException("Regex module implementing '"+mymodule->RegexEngine.GetProvider()+"' is not loaded!");
 571         regex = mymodule->RegexEngine->Create(pat);
 572 }
 573
 574 FilterResult* ModuleFilter::FilterMatch(User* user, const std::string &text, int flgs)
 575 {
 576         static std::string stripped_text;
 577         stripped_text.clear();
 578
 579         for (std::vector<ImplFilter>::iterator index = filters.begin(); index != filters.end(); index++)
 580         {
 581                 FilterResult* filter = dynamic_cast<FilterResult*>(&(*index));
 582
 583                 /* Skip ones that dont apply to us */
 584                 if (!AppliesToMe(user, filter, flgs))
 585                         continue;
 586
 587                 if ((filter->flag_strip_color) && (stripped_text.empty()))
 588                 {
 589                         stripped_text = text;
 590                         InspIRCd::StripColor(stripped_text);
 591                 }
 592
 593                 if (index->regex->Matches(filter->flag_strip_color ? stripped_text : text))
 594                         return &*index;
 595         }
 596         return NULL;
 597 }
 598
 599 bool ModuleFilter::DeleteFilter(const std::string &freeform)
 600 {
 601         for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 602         {
 603                 if (i->freeform == freeform)
 604                 {
 605                         delete i->regex;
 606                         filters.erase(i);
 607                         return true;
 608                 }
 609         }
 610         return false;
 611 }
 612
 613 std::pair<bool, std::string> ModuleFilter::AddFilter(const std::string &freeform, FilterAction type, const std::string &reason, long duration, const std::string &flgs)
 614 {
 615         for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 616         {
 617                 if (i->freeform == freeform)
 618                 {
 619                         return std::make_pair(false, "Filter already exists");
 620                 }
 621         }
 622
 623         try
 624         {
 625                 filters.push_back(ImplFilter(this, reason, type, duration, freeform, flgs));
 626         }
 627         catch (ModuleException &e)
 628         {
 629                 ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Error in regular expression '%s': %s", freeform.c_str(), e.GetReason());
 630                 return std::make_pair(false, e.GetReason());
 631         }
 632         return std::make_pair(true, "");
 633 }
 634
 635 bool ModuleFilter::StringToFilterAction(const std::string& str, FilterAction& fa)
 636 {
 637         irc::string s(str.c_str());
 638
 639         if (s == "gline")
 640                 fa = FA_GLINE;
 641         else if (s == "block")
 642                 fa = FA_BLOCK;
 643         else if (s == "silent")
 644                 fa = FA_SILENT;
 645         else if (s == "kill")
 646                 fa = FA_KILL;
 647         else if (s == "none")
 648                 fa = FA_NONE;
 649         else
 650                 return false;
 651
 652         return true;
 653 }
 654
 655 std::string ModuleFilter::FilterActionToString(FilterAction fa)
 656 {
 657         switch (fa)
 658         {
 659                 case FA_GLINE:  return "gline";
 660                 case FA_BLOCK:  return "block";
 661                 case FA_SILENT: return "silent";
 662                 case FA_KILL:   return "kill";
 663                 default:                return "none";
 664         }
 665 }
 666
 667 void ModuleFilter::ReadFilters()
 668 {
 669         ConfigTagList tags = ServerInstance->Config->ConfTags("keyword");
 670         for (ConfigIter i = tags.first; i != tags.second; ++i)
 671         {
 672                 std::string pattern = i->second->getString("pattern");
 673                 this->DeleteFilter(pattern);
 674
 675                 std::string reason = i->second->getString("reason");
 676                 std::string action = i->second->getString("action");
 677                 std::string flgs = i->second->getString("flags");
 678                 unsigned long gline_time = InspIRCd::Duration(i->second->getString("duration"));
 679                 if (flgs.empty())
 680                         flgs = "*";
 681
 682                 FilterAction fa;
 683                 if (!StringToFilterAction(action, fa))
 684                         fa = FA_NONE;
 685
 686                 try
 687                 {
 688                         filters.push_back(ImplFilter(this, reason, fa, gline_time, pattern, flgs));
 689                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Regular expression %s loaded.", pattern.c_str());
 690                 }
 691                 catch (ModuleException &e)
 692                 {
 693                         ServerInstance->Logs->Log(MODNAME, LOG_DEFAULT, "Error in regular expression '%s': %s", pattern.c_str(), e.GetReason());
 694                 }
 695         }
 696 }
 697
 698 ModResult ModuleFilter::OnStats(char symbol, User* user, string_list &results)
 699 {
 700         if (symbol == 's')
 701         {
 702                 for (std::vector<ImplFilter>::iterator i = filters.begin(); i != filters.end(); i++)
 703                 {
 704                         results.push_back(ServerInstance->Config->ServerName+" 223 "+user->nick+" :"+RegexEngine.GetProvider()+":"+i->freeform+" "+i->GetFlags()+" "+FilterActionToString(i->action)+" "+ConvToStr(i->gline_time)+" :"+i->reason);
 705                 }
 706                 for (std::set<std::string>::iterator i = exemptfromfilter.begin(); i != exemptfromfilter.end(); ++i)
 707                 {
 708                         results.push_back(ServerInstance->Config->ServerName+" 223 "+user->nick+" :EXEMPT "+(*i));
 709                 }
 710         }
 711         return MOD_RES_PASSTHRU;
 712 }
 713
 714 void ModuleFilter::OnUnloadModule(Module* mod)
 715 {
 716         // If the regex engine became unavailable or has changed, remove all filters
 717         if (!RegexEngine)
 718         {
 719                 FreeFilters();
 720         }
 721         else if (RegexEngine.operator->() != factory)
 722         {
 723                 factory = RegexEngine.operator->();
 724                 FreeFilters();
 725         }
 726 }
 727
 728 MODULE_INIT(ModuleFilter)