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