src/modules/m_dccallow.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include <stdio.h>
  15 #include <vector>
  16 #include <string.h>
  17 #include "users.h"
  18 #include "channels.h"
  19 #include "modules.h"
  20 #include "inspircd.h"
  21
  22 /* $ModDesc: Povides support for the /DCCALLOW command */
  23
  24 static ConfigReader *Conf;
  25
  26 class BannedFileList
  27 {
  28  public:
  29         std::string filemask;
  30         std::string action;
  31 };
  32
  33 class DCCAllow
  34 {
  35  public:
  36         std::string nickname;
  37         std::string hostmask;
  38         time_t set_on;
  39         long length;
  40
  41         DCCAllow() { }
  42
  43         DCCAllow(const std::string &nick, const std::string &hm, const time_t so, const long ln) : nickname(nick), hostmask(hm), set_on(so), length(ln) { }
  44 };
  45
  46 typedef std::vector<userrec *> userlist;
  47 userlist ul;
  48 typedef std::vector<DCCAllow> dccallowlist;
  49 dccallowlist* dl;
  50 typedef std::vector<BannedFileList> bannedfilelist;
  51 bannedfilelist bfl;
  52
  53 class cmd_dccallow : public command_t
  54 {
  55  public:
  56         cmd_dccallow(InspIRCd* Me) : command_t(Me, "DCCALLOW", 0, 0)
  57         {
  58                 this->source = "m_dccallow.so";
  59                 syntax = "{[+|-]<nick> <time>|HELP|LIST}";
  60         }
  61
  62         CmdResult Handle(const char **parameters, int pcnt, userrec *user)
  63         {
  64                 /* syntax: DCCALLOW [+|-]<nick> (<time>) */
  65                 if (!pcnt)
  66                 {
  67                         // display current DCCALLOW list
  68                         DisplayDCCAllowList(user);
  69                         return CMD_FAILURE;
  70                 }
  71                 else if (pcnt > 0)
  72                 {
  73                         char action = *parameters[0];
  74
  75                         // if they didn't specify an action, this is probably a command
  76                         if (action != '+' && action != '-')
  77                         {
  78                                 if (!strcasecmp(parameters[0], "LIST"))
  79                                 {
  80                                         // list current DCCALLOW list
  81                                         DisplayDCCAllowList(user);
  82                                         return CMD_FAILURE;
  83                                 }
  84                                 else if (!strcasecmp(parameters[0], "HELP"))
  85                                 {
  86                                         // display help
  87                                         DisplayHelp(user);
  88                                         return CMD_FAILURE;
  89                                 }
  90                         }
  91
  92                         std::string nick = parameters[0] + 1;
  93                         userrec *target = ServerInstance->FindNick(nick);
  94
  95                         if (target)
  96                         {
  97
  98                                 if (action == '-')
  99                                 {
 100                                         user->GetExt("dccallow_list", dl);
 101                                         // check if it contains any entries
 102                                         if (dl)
 103                                         {
 104                                                 if (dl->size())
 105                                                 {
 106                                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 107                                                         {
 108                                                                 // search through list
 109                                                                 if (i->nickname == target->nick)
 110                                                                 {
 111                                                                         dl->erase(i);
 112                                                                         user->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", user->nick, user->nick, target->nick);
 113                                                                         break;
 114                                                                 }
 115                                                         }
 116                                                 }
 117                                         }
 118                                         else
 119                                         {
 120                                                 DELETE(dl);
 121                                                 user->Shrink("dccallow_list");
 122
 123                                                 // remove from userlist
 124                                                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 125                                                 {
 126                                                         userrec* u = (userrec*)(*j);
 127                                                         if (u == user)
 128                                                         {
 129                                                                 ul.erase(j);
 130                                                                 break;
 131                                                         }
 132                                                 }
 133                                         }
 134                                 }
 135                                 else if (action == '+')
 136                                 {
 137                                         // fetch current DCCALLOW list
 138                                         user->GetExt("dccallow_list", dl);
 139                                         // they don't have one, create it
 140                                         if (!dl)
 141                                         {
 142                                                 dl = new dccallowlist;
 143                                                 user->Extend("dccallow_list", dl);
 144                                                 // add this user to the userlist
 145                                                 ul.push_back(user);
 146                                         }
 147                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 148                                         {
 149                                                 if (k->nickname == target->nick)
 150                                                 {
 151                                                         user->WriteServ("996 %s %s :%s is already on your DCCALLOW list", user->nick, user->nick, target->nick);
 152                                                         return CMD_FAILURE;
 153                                                 }
 154                                                 else if (ServerInstance->MatchText(user->GetFullHost(), k->hostmask))
 155                                                 {
 156                                                         user->WriteServ("996 %s %s :You cannot add yourself to your own DCCALLOW list!", user->nick, user->nick);
 157                                                         return CMD_FAILURE;
 158                                                 }
 159                                         }
 160
 161                                         std::string mask = std::string(target->nick)+"!"+std::string(target->ident)+"@"+std::string(target->dhost);
 162                                         std::string default_length = Conf->ReadValue("dccallow", "length", 0);
 163
 164                                         long length;
 165                                         if (pcnt < 2)
 166                                         {
 167                                                 length = ServerInstance->Duration(default_length.c_str());
 168                                         }
 169                                         else if (!atoi(parameters[1]))
 170                                         {
 171                                                 length = 0;
 172                                         }
 173                                         else
 174                                         {
 175                                                 length = ServerInstance->Duration(parameters[1]);
 176                                         }
 177
 178                                         if (!ServerInstance->IsValidMask(mask.c_str()))
 179                                         {
 180                                                 return CMD_FAILURE;
 181                                         }
 182
 183                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 184
 185                                         if (length > 0)
 186                                         {
 187                                                 user->WriteServ("993 %s %s :Added %s to DCCALLOW list for %d seconds", user->nick, user->nick, target->nick, length);
 188                                         }
 189                                         else
 190                                         {
 191                                                 user->WriteServ("994 %s %s :Added %s to DCCALLOW list for this session", user->nick, user->nick, target->nick);
 192                                         }
 193
 194                                         /* route it. */
 195                                         return CMD_SUCCESS;
 196                                 }
 197                         }
 198                         else
 199                         {
 200                                 // nick doesn't exist
 201                                 user->WriteServ("401 %s %s :No such nick/channel", user->nick, nick.c_str());
 202                                 return CMD_FAILURE;
 203                         }
 204                 }
 205                 return CMD_FAILURE;
 206         }
 207
 208         void DisplayHelp(userrec* user)
 209         {
 210                 user->WriteServ("998 %s :DCCALLOW [<+|->nick [time]] [list] [help]", user->nick);
 211                 user->WriteServ("998 %s :You may allow DCCs from specific users by specifying a", user->nick);
 212                 user->WriteServ("998 %s :DCC allow for the user you want to receive DCCs from.", user->nick);
 213                 user->WriteServ("998 %s :For example, to allow the user Brain to send you inspircd.exe", user->nick);
 214                 user->WriteServ("998 %s :you would type:", user->nick);
 215                 user->WriteServ("998 %s :/DCCALLOW +Brain", user->nick);
 216                 user->WriteServ("998 %s :Brain would then be able to send you files. They would have to", user->nick);
 217                 user->WriteServ("998 %s :resend the file again if the server gave them an error message", user->nick);
 218                 user->WriteServ("998 %s :before you added them to your DCCALLOW list.", user->nick);
 219                 user->WriteServ("998 %s :DCCALLOW entries will be temporary by default, if you want to add", user->nick);
 220                 user->WriteServ("998 %s :them to your DCCALLOW list until you leave IRC, type:", user->nick);
 221                 user->WriteServ("998 %s :/DCCALLOW +Brain 0", user->nick);
 222                 user->WriteServ("998 %s :To remove the user from your DCCALLOW list, type:", user->nick);
 223                 user->WriteServ("998 %s :/DCCALLOW -Brain", user->nick);
 224                 user->WriteServ("998 %s :To see the users in your DCCALLOW list, type:", user->nick);
 225                 user->WriteServ("998 %s :/DCCALLOW LIST", user->nick);
 226                 user->WriteServ("998 %s :NOTE: If the user leaves IRC or changes their nickname", user->nick);
 227                 user->WriteServ("998 %s :  they will be removed from your DCCALLOW list.", user->nick);
 228                 user->WriteServ("998 %s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick);
 229                 user->WriteServ("999 %s :End of DCCALLOW HELP", user->nick);
 230         }
 231
 232         void DisplayDCCAllowList(userrec* user)
 233         {
 234                  // display current DCCALLOW list
 235                 user->WriteServ("990 %s :Users on your DCCALLOW list:", user->nick);
 236                 user->GetExt("dccallow_list", dl);
 237
 238                 if (dl)
 239                 {
 240                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 241                         {
 242                                 user->WriteServ("991 %s %s :%s (%s)", user->nick, user->nick, c->nickname.c_str(), c->hostmask.c_str());
 243                         }
 244                 }
 245
 246                 user->WriteServ("992 %s :End of DCCALLOW list", user->nick);
 247         }
 248
 249 };
 250
 251 class ModuleDCCAllow : public Module
 252 {
 253         cmd_dccallow* mycommand;
 254  public:
 255
 256         ModuleDCCAllow(InspIRCd* Me)
 257                 : Module::Module(Me)
 258         {
 259                 Conf = new ConfigReader(ServerInstance);
 260                 mycommand = new cmd_dccallow(ServerInstance);
 261                 ServerInstance->AddCommand(mycommand);
 262                 ReadFileConf();
 263         }
 264
 265         void Implements(char* List)
 266         {
 267                 List[I_OnUserPreMessage] = List[I_OnUserPreNotice] = List[I_OnUserQuit] = List[I_OnUserPreNick] = List[I_OnRehash] = 1;
 268         }
 269
 270         virtual void OnRehash(userrec* user, const std::string &parameter)
 271         {
 272                 delete Conf;
 273                 Conf = new ConfigReader(ServerInstance);
 274         }
 275
 276         virtual void OnUserQuit(userrec* user, const std::string &reason, const std::string &oper_message)
 277         {
 278                 dccallowlist* dl;
 279
 280                 // remove their DCCALLOW list if they have one
 281                 user->GetExt("dccallow_list", dl);
 282                 if (dl)
 283                 {
 284                         DELETE(dl);
 285                         user->Shrink("dccallow_list");
 286                         RemoveFromUserlist(user);
 287                 }
 288
 289                 // remove them from any DCCALLOW lists
 290                 // they are currently on
 291                 RemoveNick(user);
 292         }
 293
 294
 295         virtual int OnUserPreNick(userrec* user, const std::string &newnick)
 296         {
 297                 RemoveNick(user);
 298                 return 0;
 299         }
 300
 301         virtual int OnUserPreMessage(userrec* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 302         {
 303                 return OnUserPreNotice(user, dest, target_type, text, status, exempt_list);
 304         }
 305
 306         virtual int OnUserPreNotice(userrec* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 307         {
 308                 if (!IS_LOCAL(user))
 309                         return 0;
 310
 311                 if (target_type == TYPE_USER)
 312                 {
 313                         userrec* u = (userrec*)dest;
 314
 315                         /* Always allow a user to dcc themselves (although... why?) */
 316                         if (user == u)
 317                                 return 0;
 318
 319                         if ((text.length()) && (text[0] == '\1'))
 320                         {
 321
 322                                 Expire();
 323
 324                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 325                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 326
 327                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 328                                 {
 329                                         u->GetExt("dccallow_list", dl);
 330
 331                                         if (dl)
 332                                         {
 333                                                 if (dl->size())
 334                                                 {
 335                                                         for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 336                                                         {
 337                                                                 if (ServerInstance->MatchText(user->GetFullHost(), iter->hostmask))
 338                                                                 {
 339                                                                         return 0;
 340                                                                 }
 341                                                         }
 342                                                 }
 343                                         }
 344
 345                                         // tokenize
 346                                         stringstream ss(text);
 347                                         std::string buf;
 348                                         vector<string> tokens;
 349
 350                                         while (ss >> buf)
 351                                                 tokens.push_back(buf);
 352
 353                                         irc::string type = tokens[1].c_str();
 354
 355                                         bool blockchat = Conf->ReadFlag("dccallow", "blockchat", 0);
 356
 357                                         if (type == "SEND")
 358                                         {
 359                                                 std::string defaultaction = Conf->ReadValue("dccallow", "action", 0);
 360                                                 std::string filename = tokens[2];
 361
 362                                                 if (defaultaction == "allow")
 363                                                         return 0;
 364
 365                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 366                                                 {
 367                                                         if (ServerInstance->MatchText(filename, bfl[i].filemask))
 368                                                         {
 369                                                                 if (bfl[i].action == "allow")
 370                                                                         return 0;
 371                                                         }
 372                                                         else
 373                                                         {
 374                                                                 if (defaultaction == "allow")
 375                                                                         return 0;
 376                                                         }
 377                                                         user->WriteServ("NOTICE %s :The user %s is not accepting DCC SENDs from you. Your file %s was not sent.", user->nick, u->nick, filename.c_str());
 378                                                         u->WriteServ("NOTICE %s :%s (%s@%s) attempted to send you a file named %s, which was blocked.", u->nick, user->nick, user->ident, user->dhost, filename.c_str());
 379                                                         u->WriteServ("NOTICE %s :If you trust %s and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.", u->nick, user->nick);
 380                                                 }
 381                                         }
 382                                         else if ((type == "CHAT") && (blockchat))
 383                                         {
 384                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick, u->nick);
 385                                                 u->WriteServ("NOTICE %s :%s (%s@%s) attempted to initiate a DCC CHAT session, which was blocked.", u->nick, user->nick, user->ident, user->dhost);
 386                                                 u->WriteServ("NOTICE %s :If you trust %s and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.", u->nick, user->nick);
 387                                         }
 388                                         return 1;
 389                                 }
 390                         }
 391                 }
 392                 return 0;
 393         }
 394
 395         void Expire()
 396         {
 397                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 398                 {
 399                         userrec* u = (userrec*)(*iter);
 400                         u->GetExt("dccallow_list", dl);
 401
 402                         if (dl)
 403                         {
 404                                 if (dl->size())
 405                                 {
 406                                         dccallowlist::iterator iter = dl->begin();
 407                                         while (iter != dl->end())
 408                                         {
 409                                                 if ((iter->set_on + iter->length) <= ServerInstance->Time())
 410                                                 {
 411                                                         u->WriteServ("997 %s %s :DCCALLOW entry for %s has expired", u->nick, u->nick, iter->nickname.c_str());
 412                                                         iter = dl->erase(iter);
 413                                                 }
 414                                                 else
 415                                                 {
 416                                                         ++iter;
 417                                                 }
 418                                         }
 419                                 }
 420                         }
 421                         else
 422                         {
 423                                 RemoveFromUserlist(u);
 424                         }
 425                 }
 426         }
 427
 428         void RemoveNick(userrec* user)
 429         {
 430                 /* Iterate through all DCCALLOW lists and remove user */
 431                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 432                 {
 433                         userrec *u = (userrec*)(*iter);
 434                         u->GetExt("dccallow_list", dl);
 435
 436                         if (dl)
 437                         {
 438                                 if (dl->size())
 439                                 {
 440                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 441                                         {
 442                                                 if (i->nickname == user->nick)
 443                                                 {
 444
 445                                                         u->WriteServ("NOTICE %s :%s left the network or changed their nickname and has been removed from your DCCALLOW list", u->nick, i->nickname.c_str());
 446                                                         u->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", u->nick, u->nick, i->nickname.c_str());
 447                                                         dl->erase(i);
 448                                                         break;
 449                                                 }
 450                                         }
 451                                 }
 452                         }
 453                         else
 454                         {
 455                                 RemoveFromUserlist(u);
 456                         }
 457                 }
 458         }
 459
 460         void RemoveFromUserlist(userrec *user)
 461         {
 462                 // remove user from userlist
 463                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 464                 {
 465                         userrec* u = (userrec*)(*j);
 466                         if (u == user)
 467                         {
 468                                 ul.erase(j);
 469                                 break;
 470                         }
 471                 }
 472         }
 473
 474         void ReadFileConf()
 475         {
 476                 bfl.clear();
 477                 for (int i = 0; i < Conf->Enumerate("banfile"); i++)
 478                 {
 479                         BannedFileList bf;
 480                         std::string fileglob = Conf->ReadValue("banfile", "pattern", i);
 481                         std::string action = Conf->ReadValue("banfile", "action", i);
 482                         bf.filemask = fileglob;
 483                         bf.action = action;
 484                         bfl.push_back(bf);
 485                 }
 486
 487         }
 488
 489         virtual ~ModuleDCCAllow()
 490         {
 491         }
 492
 493         virtual Version GetVersion()
 494         {
 495                 return Version(1,1,0,0,VF_COMMON|VF_VENDOR,API_VERSION);
 496         }
 497 };
 498
 499 class ModuleDCCAllowFactory : public ModuleFactory
 500 {
 501  public:
 502         ModuleDCCAllowFactory()
 503         {
 504         }
 505
 506         ~ModuleDCCAllowFactory()
 507         {
 508         }
 509
 510         virtual Module * CreateModule(InspIRCd* Me)
 511         {
 512                 return new ModuleDCCAllow(Me);
 513         }
 514
 515 };
 516
 517 extern "C" void * init_module( void )
 518 {
 519         return new ModuleDCCAllowFactory;
 520 }