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                                 ServerInstance->Log(DEBUG, "m_dccallow.so: got target %s and action %c", target->nick, action);
  98
  99                                 if (action == '-')
 100                                 {
 101                                         user->GetExt("dccallow_list", dl);
 102                                         // check if it contains any entries
 103                                         if (dl)
 104                                         {
 105                                                 if (dl->size())
 106                                                 {
 107                                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 108                                                         {
 109                                                                 // search through list
 110                                                                 if (i->nickname == target->nick)
 111                                                                 {
 112                                                                         dl->erase(i);
 113                                                                         user->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", user->nick, user->nick, target->nick);
 114                                                                         break;
 115                                                                 }
 116                                                         }
 117                                                 }
 118                                         }
 119                                         else
 120                                         {
 121                                                 DELETE(dl);
 122                                                 user->Shrink("dccallow_list");
 123
 124                                                 // remove from userlist
 125                                                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 126                                                 {
 127                                                         userrec* u = (userrec*)(*j);
 128                                                         if (u == user)
 129                                                         {
 130                                                                 ul.erase(j);
 131                                                                 break;
 132                                                         }
 133                                                 }
 134                                         }
 135                                 }
 136                                 else if (action == '+')
 137                                 {
 138                                         // fetch current DCCALLOW list
 139                                         user->GetExt("dccallow_list", dl);
 140                                         // they don't have one, create it
 141                                         if (!dl)
 142                                         {
 143                                                 dl = new dccallowlist;
 144                                                 user->Extend("dccallow_list", dl);
 145                                                 // add this user to the userlist
 146                                                 ul.push_back(user);
 147                                         }
 148                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 149                                         {
 150                                                 if (k->nickname == target->nick)
 151                                                 {
 152                                                         user->WriteServ("996 %s %s :%s is already on your DCCALLOW list", user->nick, user->nick, target->nick);
 153                                                         return CMD_FAILURE;
 154                                                 }
 155                                                 else if (ServerInstance->MatchText(user->GetFullHost(), k->hostmask))
 156                                                 {
 157                                                         user->WriteServ("996 %s %s :You cannot add yourself to your own DCCALLOW list!", user->nick, user->nick);
 158                                                         return CMD_FAILURE;
 159                                                 }
 160                                         }
 161
 162                                         std::string mask = std::string(target->nick)+"!"+std::string(target->ident)+"@"+std::string(target->dhost);
 163                                         std::string default_length = Conf->ReadValue("dccallow", "length", 0);
 164
 165                                         long length;
 166                                         if (pcnt < 2)
 167                                         {
 168                                                 length = ServerInstance->Duration(default_length.c_str());
 169                                         }
 170                                         else if (!atoi(parameters[1]))
 171                                         {
 172                                                 length = 0;
 173                                         }
 174                                         else
 175                                         {
 176                                                 length = ServerInstance->Duration(parameters[1]);
 177                                         }
 178
 179                                         if (!ServerInstance->IsValidMask(mask.c_str()))
 180                                         {
 181                                                 return CMD_FAILURE;
 182                                         }
 183
 184                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 185
 186                                         if (length > 0)
 187                                         {
 188                                                 user->WriteServ("993 %s %s :Added %s to DCCALLOW list for %d seconds", user->nick, user->nick, target->nick, length);
 189                                         }
 190                                         else
 191                                         {
 192                                                 user->WriteServ("994 %s %s :Added %s to DCCALLOW list for this session", user->nick, user->nick, target->nick);
 193                                         }
 194
 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(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)
 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                 Expire();
 309
 310                 if (target_type == TYPE_USER)
 311                 {
 312                         userrec* u = (userrec*)dest;
 313
 314                         /* Always allow a user to dcc themselves (although... why?) */
 315                         if (user == u)
 316                                 return 0;
 317
 318                         if ((text.length()) && (text[0] == '\1'))
 319                         {
 320                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 321                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 322
 323                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 324                                 {
 325                                         u->GetExt("dccallow_list", dl);
 326
 327                                         if (dl)
 328                                         {
 329                                                 if (dl->size())
 330                                                 {
 331                                                         for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 332                                                         {
 333                                                                 if (ServerInstance->MatchText(user->GetFullHost(), iter->hostmask))
 334                                                                 {
 335                                                                         return 0;
 336                                                                 }
 337                                                         }
 338                                                 }
 339                                         }
 340
 341                                         // tokenize
 342                                         stringstream ss(text);
 343                                         std::string buf;
 344                                         vector<string> tokens;
 345
 346                                         while (ss >> buf)
 347                                                 tokens.push_back(buf);
 348
 349                                         irc::string type = tokens[1].c_str();
 350                                         ServerInstance->Log(DEBUG, "m_dccallow.so: got DCC type %s", type.c_str());
 351
 352                                         bool blockchat = Conf->ReadFlag("dccallow", "blockchat", 0);
 353
 354                                         if (type == "SEND")
 355                                         {
 356                                                 std::string defaultaction = Conf->ReadValue("dccallow", "action", 0);
 357                                                 std::string filename = tokens[2];
 358
 359                                                 if (defaultaction == "allow")
 360                                                 {
 361                                                         return 0;
 362                                                 }
 363
 364                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 365                                                 {
 366                                                         if (ServerInstance->MatchText(filename, bfl[i].filemask))
 367                                                         {
 368                                                                 if (strcmp(bfl[i].action.c_str(), "allow") == 0)
 369                                                                 {
 370                                                                         return 0;
 371                                                                 }
 372                                                         }
 373                                                         else
 374                                                         {
 375                                                                 if (defaultaction == "allow")
 376                                                                 {
 377                                                                         return 0;
 378                                                                 }
 379                                                         }
 380                                                         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());
 381                                                         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());
 382                                                         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);
 383                                                 }
 384                                         }
 385                                         else if ((type == "CHAT") && (blockchat))
 386                                         {
 387                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick, u->nick);
 388                                                 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);
 389                                                 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);
 390                                         }
 391                                         return 1;
 392                                 }
 393                         }
 394                 }
 395                 return 0;
 396         }
 397
 398         void Expire()
 399         {
 400                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 401                 {
 402                         userrec* u = (userrec*)(*iter);
 403                         u->GetExt("dccallow_list", dl);
 404
 405                         if (dl)
 406                         {
 407                                 if (dl->size())
 408                                 {
 409                                         dccallowlist::iterator iter = dl->begin();
 410                                         while (iter != dl->end())
 411                                         {
 412                                                 if ((iter->set_on + iter->length) <= ServerInstance->Time())
 413                                                 {
 414                                                         u->WriteServ("997 %s %s :DCCALLOW entry for %s has expired", u->nick, u->nick, iter->nickname.c_str());
 415                                                         iter = dl->erase(iter);
 416                                                 }
 417                                                 else
 418                                                 {
 419                                                         ++iter;
 420                                                 }
 421                                         }
 422                                 }
 423                         }
 424                         else
 425                         {
 426                                 RemoveFromUserlist(u);
 427                                 ServerInstance->Log(DEBUG, "m_dccallow.so: UH OH! Couldn't get DCCALLOW list for %s", u->nick);
 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 }