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