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