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                                         return CMD_SUCCESS;
 195                                 }
 196                         }
 197                         else
 198                         {
 199                                 // nick doesn't exist
 200                                 user->WriteServ("401 %s %s :No such nick/channel", user->nick, nick.c_str());
 201                                 return CMD_FAILURE;
 202                         }
 203                 }
 204                 return CMD_FAILURE;
 205         }
 206
 207         void DisplayHelp(userrec* user)
 208         {
 209                 user->WriteServ("998 %s :DCCALLOW [<+|->nick [time]] [list] [help]", user->nick);
 210                 user->WriteServ("998 %s :You may allow DCCs from specific users by specifying a", user->nick);
 211                 user->WriteServ("998 %s :DCC allow for the user you want to receive DCCs from.", user->nick);
 212                 user->WriteServ("998 %s :For example, to allow the user Brain to send you inspircd.exe", user->nick);
 213                 user->WriteServ("998 %s :you would type:", user->nick);
 214                 user->WriteServ("998 %s :/DCCALLOW +Brain", user->nick);
 215                 user->WriteServ("998 %s :Brain would then be able to send you files. They would have to", user->nick);
 216                 user->WriteServ("998 %s :resend the file again if the server gave them an error message", user->nick);
 217                 user->WriteServ("998 %s :before you added them to your DCCALLOW list.", user->nick);
 218                 user->WriteServ("998 %s :DCCALLOW entries will be temporary by default, if you want to add", user->nick);
 219                 user->WriteServ("998 %s :them to your DCCALLOW list until you leave IRC, type:", user->nick);
 220                 user->WriteServ("998 %s :/DCCALLOW +Brain 0", user->nick);
 221                 user->WriteServ("998 %s :To remove the user from your DCCALLOW list, type:", user->nick);
 222                 user->WriteServ("998 %s :/DCCALLOW -Brain", user->nick);
 223                 user->WriteServ("998 %s :To see the users in your DCCALLOW list, type:", user->nick);
 224                 user->WriteServ("998 %s :/DCCALLOW LIST", user->nick);
 225                 user->WriteServ("998 %s :NOTE: If the user leaves IRC or changes their nickname", user->nick);
 226                 user->WriteServ("998 %s :  they will be removed from your DCCALLOW list.", user->nick);
 227                 user->WriteServ("998 %s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick);
 228                 user->WriteServ("999 %s :End of DCCALLOW HELP", user->nick);
 229         }
 230
 231         void DisplayDCCAllowList(userrec* user)
 232         {
 233                  // display current DCCALLOW list
 234                 user->WriteServ("990 %s :Users on your DCCALLOW list:", user->nick);
 235                 user->GetExt("dccallow_list", dl);
 236
 237                 if (dl)
 238                 {
 239                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 240                         {
 241                                 user->WriteServ("991 %s %s :%s (%s)", user->nick, user->nick, c->nickname.c_str(), c->hostmask.c_str());
 242                         }
 243                 }
 244
 245                 user->WriteServ("992 %s :End of DCCALLOW list", user->nick);
 246         }
 247
 248 };
 249
 250 class ModuleDCCAllow : public Module
 251 {
 252         cmd_dccallow* mycommand;
 253  public:
 254
 255         ModuleDCCAllow(InspIRCd* Me)
 256                 : Module::Module(Me)
 257         {
 258                 Conf = new ConfigReader(ServerInstance);
 259                 mycommand = new cmd_dccallow(ServerInstance);
 260                 ServerInstance->AddCommand(mycommand);
 261                 ReadFileConf();
 262         }
 263
 264         void Implements(char* List)
 265         {
 266                 List[I_OnUserPreMessage] = List[I_OnUserPreNotice] = List[I_OnUserQuit] = List[I_OnUserPreNick] = List[I_OnRehash] = 1;
 267         }
 268
 269         virtual void OnRehash(userrec* user, const std::string &parameter)
 270         {
 271                 delete Conf;
 272                 Conf = new ConfigReader(ServerInstance);
 273         }
 274
 275         virtual void OnUserQuit(userrec* user, const std::string &reason)
 276         {
 277                 dccallowlist* dl;
 278
 279                 // remove their DCCALLOW list if they have one
 280                 user->GetExt("dccallow_list", dl);
 281                 if (dl)
 282                 {
 283                         DELETE(dl);
 284                         user->Shrink("dccallow_list");
 285                         RemoveFromUserlist(user);
 286                 }
 287
 288                 // remove them from any DCCALLOW lists
 289                 // they are currently on
 290                 RemoveNick(user);
 291         }
 292
 293
 294         virtual int OnUserPreNick(userrec* user, const std::string &newnick)
 295         {
 296                 RemoveNick(user);
 297                 return 0;
 298         }
 299
 300         virtual int OnUserPreMessage(userrec* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 301         {
 302                 return OnUserPreNotice(user, dest, target_type, text, status, exempt_list);
 303         }
 304
 305         virtual int OnUserPreNotice(userrec* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 306         {
 307                 if (!IS_LOCAL(user))
 308                         return 0;
 309
 310                 Expire();
 311
 312                 if (target_type == TYPE_USER)
 313                 {
 314                         userrec* u = (userrec*)dest;
 315
 316                         /* Always allow a user to dcc themselves (although... why?) */
 317                         if (user == u)
 318                                 return 0;
 319
 320                         if ((text.length()) && (text[0] == '\1'))
 321                         {
 322                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 323                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 324
 325                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 326                                 {
 327                                         u->GetExt("dccallow_list", dl);
 328
 329                                         if (dl)
 330                                         {
 331                                                 if (dl->size())
 332                                                 {
 333                                                         for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 334                                                         {
 335                                                                 if (ServerInstance->MatchText(user->GetFullHost(), iter->hostmask))
 336                                                                 {
 337                                                                         return 0;
 338                                                                 }
 339                                                         }
 340                                                 }
 341                                         }
 342
 343                                         // tokenize
 344                                         stringstream ss(text);
 345                                         std::string buf;
 346                                         vector<string> tokens;
 347
 348                                         while (ss >> buf)
 349                                                 tokens.push_back(buf);
 350
 351                                         irc::string type = tokens[1].c_str();
 352
 353                                         bool blockchat = Conf->ReadFlag("dccallow", "blockchat", 0);
 354
 355                                         if (type == "SEND")
 356                                         {
 357                                                 std::string defaultaction = Conf->ReadValue("dccallow", "action", 0);
 358                                                 std::string filename = tokens[2];
 359
 360                                                 if (defaultaction == "allow")
 361                                                 {
 362                                                         return 0;
 363                                                 }
 364
 365                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 366                                                 {
 367                                                         if (ServerInstance->MatchText(filename, bfl[i].filemask))
 368                                                         {
 369                                                                 if (strcmp(bfl[i].action.c_str(), "allow") == 0)
 370                                                                 {
 371                                                                         return 0;
 372                                                                 }
 373                                                         }
 374                                                         else
 375                                                         {
 376                                                                 if (defaultaction == "allow")
 377                                                                 {
 378                                                                         return 0;
 379                                                                 }
 380                                                         }
 381                                                         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());
 382                                                         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());
 383                                                         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);
 384                                                 }
 385                                         }
 386                                         else if ((type == "CHAT") && (blockchat))
 387                                         {
 388                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick, u->nick);
 389                                                 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);
 390                                                 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);
 391                                         }
 392                                         return 1;
 393                                 }
 394                         }
 395                 }
 396                 return 0;
 397         }
 398
 399         void Expire()
 400         {
 401                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 402                 {
 403                         userrec* u = (userrec*)(*iter);
 404                         u->GetExt("dccallow_list", dl);
 405
 406                         if (dl)
 407                         {
 408                                 if (dl->size())
 409                                 {
 410                                         dccallowlist::iterator iter = dl->begin();
 411                                         while (iter != dl->end())
 412                                         {
 413                                                 if ((iter->set_on + iter->length) <= ServerInstance->Time())
 414                                                 {
 415                                                         u->WriteServ("997 %s %s :DCCALLOW entry for %s has expired", u->nick, u->nick, iter->nickname.c_str());
 416                                                         iter = dl->erase(iter);
 417                                                 }
 418                                                 else
 419                                                 {
 420                                                         ++iter;
 421                                                 }
 422                                         }
 423                                 }
 424                         }
 425                         else
 426                         {
 427                                 RemoveFromUserlist(u);
 428                         }
 429                 }
 430         }
 431
 432         void RemoveNick(userrec* user)
 433         {
 434                 /* Iterate through all DCCALLOW lists and remove user */
 435                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 436                 {
 437                         userrec *u = (userrec*)(*iter);
 438                         u->GetExt("dccallow_list", dl);
 439
 440                         if (dl)
 441                         {
 442                                 if (dl->size())
 443                                 {
 444                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 445                                         {
 446                                                 if (i->nickname == user->nick)
 447                                                 {
 448
 449                                                         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());
 450                                                         u->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", u->nick, u->nick, i->nickname.c_str());
 451                                                         dl->erase(i);
 452                                                         break;
 453                                                 }
 454                                         }
 455                                 }
 456                         }
 457                         else
 458                         {
 459                                 RemoveFromUserlist(u);
 460                         }
 461                 }
 462         }
 463
 464         void RemoveFromUserlist(userrec *user)
 465         {
 466                 // remove user from userlist
 467                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 468                 {
 469                         userrec* u = (userrec*)(*j);
 470                         if (u == user)
 471                         {
 472                                 ul.erase(j);
 473                                 break;
 474                         }
 475                 }
 476         }
 477
 478         void ReadFileConf()
 479         {
 480                 bfl.clear();
 481                 for (int i = 0; i < Conf->Enumerate("banfile"); i++)
 482                 {
 483                         BannedFileList bf;
 484                         std::string fileglob = Conf->ReadValue("banfile", "pattern", i);
 485                         std::string action = Conf->ReadValue("banfile", "action", i);
 486                         bf.filemask = fileglob;
 487                         bf.action = action;
 488                         bfl.push_back(bf);
 489                 }
 490
 491         }
 492
 493         virtual ~ModuleDCCAllow()
 494         {
 495         }
 496
 497         virtual Version GetVersion()
 498         {
 499                 return Version(1,1,0,0,VF_COMMON,API_VERSION);
 500         }
 501 };
 502
 503 class ModuleDCCAllowFactory : public ModuleFactory
 504 {
 505  public:
 506         ModuleDCCAllowFactory()
 507         {
 508         }
 509
 510         ~ModuleDCCAllowFactory()
 511         {
 512         }
 513
 514         virtual Module * CreateModule(InspIRCd* Me)
 515         {
 516                 return new ModuleDCCAllow(Me);
 517         }
 518
 519 };
 520
 521 extern "C" void * init_module( void )
 522 {
 523         return new ModuleDCCAllowFactory;
 524 }