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