src/modules/m_dccallow.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/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 : public classbase
  21 {
  22  public:
  23         std::string filemask;
  24         std::string action;
  25 };
  26
  27 class DCCAllow : public classbase
  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 SimpleExtItem<dccallowlist>* ext;
  47
  48 class CommandDccallow : public Command
  49 {
  50  public:
  51         CommandDccallow(Module* parent) : Command(parent, "DCCALLOW", 0)
  52         {
  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 std::vector<std::string> &parameters, User *user)
  58         {
  59                 /* syntax: DCCALLOW [+|-]<nick> (<time>) */
  60                 if (!parameters.size())
  61                 {
  62                         // display current DCCALLOW list
  63                         DisplayDCCAllowList(user);
  64                         return CMD_FAILURE;
  65                 }
  66                 else if (parameters.size() > 0)
  67                 {
  68                         char action = *parameters[0].c_str();
  69
  70                         // if they didn't specify an action, this is probably a command
  71                         if (action != '+' && action != '-')
  72                         {
  73                                 if (!strcasecmp(parameters[0].c_str(), "LIST"))
  74                                 {
  75                                         // list current DCCALLOW list
  76                                         DisplayDCCAllowList(user);
  77                                         return CMD_FAILURE;
  78                                 }
  79                                 else if (!strcasecmp(parameters[0].c_str(), "HELP"))
  80                                 {
  81                                         // display help
  82                                         DisplayHelp(user);
  83                                         return CMD_FAILURE;
  84                                 }
  85                                 else
  86                                 {
  87                                         user->WriteNumeric(998, "%s :DCCALLOW command not understood. For help on DCCALLOW, type /DCCALLOW HELP", user->nick.c_str());
  88                                         return CMD_FAILURE;
  89                                 }
  90                         }
  91
  92                         std::string nick = parameters[0].substr(1);
  93                         User *target = ServerInstance->FindNick(nick);
  94
  95                         if (target)
  96                         {
  97
  98                                 if (action == '-')
  99                                 {
 100                                         // check if it contains any entries
 101                                         dl = ext->get(user);
 102                                         if (dl)
 103                                         {
 104                                                 for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 105                                                 {
 106                                                         // search through list
 107                                                         if (i->nickname == target->nick)
 108                                                         {
 109                                                                 dl->erase(i);
 110                                                                 user->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 111                                                                 break;
 112                                                         }
 113                                                 }
 114                                         }
 115                                 }
 116                                 else if (action == '+')
 117                                 {
 118                                         if (target == user)
 119                                         {
 120                                                 user->WriteNumeric(996, "%s %s :You cannot add yourself to your own DCCALLOW list!", user->nick.c_str(), user->nick.c_str());
 121                                                 return CMD_FAILURE;
 122                                         }
 123
 124                                         dl = ext->get(user);
 125                                         if (!dl)
 126                                         {
 127                                                 dl = new dccallowlist;
 128                                                 ext->set(user, dl);
 129                                                 // add this user to the userlist
 130                                                 ul.push_back(user);
 131                                         }
 132
 133                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 134                                         {
 135                                                 if (k->nickname == target->nick)
 136                                                 {
 137                                                         user->WriteNumeric(996, "%s %s :%s is already on your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 138                                                         return CMD_FAILURE;
 139                                                 }
 140                                         }
 141
 142                                         std::string mask = std::string(target->nick)+"!"+std::string(target->ident)+"@"+std::string(target->dhost);
 143                                         std::string default_length = Conf->ReadValue("dccallow", "length", 0);
 144
 145                                         long length;
 146                                         if (parameters.size() < 2)
 147                                         {
 148                                                 length = ServerInstance->Duration(default_length);
 149                                         }
 150                                         else if (!atoi(parameters[1].c_str()))
 151                                         {
 152                                                 length = 0;
 153                                         }
 154                                         else
 155                                         {
 156                                                 length = ServerInstance->Duration(parameters[1]);
 157                                         }
 158
 159                                         if (!ServerInstance->IsValidMask(mask.c_str()))
 160                                         {
 161                                                 return CMD_FAILURE;
 162                                         }
 163
 164                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 165
 166                                         if (length > 0)
 167                                         {
 168                                                 user->WriteNumeric(993, "%s %s :Added %s to DCCALLOW list for %ld seconds", user->nick.c_str(), user->nick.c_str(), target->nick.c_str(), length);
 169                                         }
 170                                         else
 171                                         {
 172                                                 user->WriteNumeric(994, "%s %s :Added %s to DCCALLOW list for this session", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 173                                         }
 174
 175                                         /* route it. */
 176                                         return CMD_SUCCESS;
 177                                 }
 178                         }
 179                         else
 180                         {
 181                                 // nick doesn't exist
 182                                 user->WriteNumeric(401, "%s %s :No such nick/channel", user->nick.c_str(), nick.c_str());
 183                                 return CMD_FAILURE;
 184                         }
 185                 }
 186                 return CMD_FAILURE;
 187         }
 188
 189         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
 190         {
 191                 return ROUTE_BROADCAST;
 192         }
 193
 194         void DisplayHelp(User* user)
 195         {
 196                 user->WriteNumeric(998, "%s :DCCALLOW [<+|->nick [time]] [list] [help]", user->nick.c_str());
 197                 user->WriteNumeric(998, "%s :You may allow DCCs from specific users by specifying a", user->nick.c_str());
 198                 user->WriteNumeric(998, "%s :DCC allow for the user you want to receive DCCs from.", user->nick.c_str());
 199                 user->WriteNumeric(998, "%s :For example, to allow the user Brain to send you inspircd.exe", user->nick.c_str());
 200                 user->WriteNumeric(998, "%s :you would type:", user->nick.c_str());
 201                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain", user->nick.c_str());
 202                 user->WriteNumeric(998, "%s :Brain would then be able to send you files. They would have to", user->nick.c_str());
 203                 user->WriteNumeric(998, "%s :resend the file again if the server gave them an error message", user->nick.c_str());
 204                 user->WriteNumeric(998, "%s :before you added them to your DCCALLOW list.", user->nick.c_str());
 205                 user->WriteNumeric(998, "%s :DCCALLOW entries will be temporary by default, if you want to add", user->nick.c_str());
 206                 user->WriteNumeric(998, "%s :them to your DCCALLOW list until you leave IRC, type:", user->nick.c_str());
 207                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain 0", user->nick.c_str());
 208                 user->WriteNumeric(998, "%s :To remove the user from your DCCALLOW list, type:", user->nick.c_str());
 209                 user->WriteNumeric(998, "%s :/DCCALLOW -Brain", user->nick.c_str());
 210                 user->WriteNumeric(998, "%s :To see the users in your DCCALLOW list, type:", user->nick.c_str());
 211                 user->WriteNumeric(998, "%s :/DCCALLOW LIST", user->nick.c_str());
 212                 user->WriteNumeric(998, "%s :NOTE: If the user leaves IRC or changes their nickname", user->nick.c_str());
 213                 user->WriteNumeric(998, "%s :  they will be removed from your DCCALLOW list.", user->nick.c_str());
 214                 user->WriteNumeric(998, "%s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick.c_str());
 215                 user->WriteNumeric(999, "%s :End of DCCALLOW HELP", user->nick.c_str());
 216         }
 217
 218         void DisplayDCCAllowList(User* user)
 219         {
 220                  // display current DCCALLOW list
 221                 user->WriteNumeric(990, "%s :Users on your DCCALLOW list:", user->nick.c_str());
 222
 223                 dl = ext->get(user);
 224                 if (dl)
 225                 {
 226                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 227                         {
 228                                 user->WriteNumeric(991, "%s %s :%s (%s)", user->nick.c_str(), user->nick.c_str(), c->nickname.c_str(), c->hostmask.c_str());
 229                         }
 230                 }
 231
 232                 user->WriteNumeric(992, "%s :End of DCCALLOW list", user->nick.c_str());
 233         }
 234
 235 };
 236
 237 class ModuleDCCAllow : public Module
 238 {
 239         CommandDccallow cmd;
 240  public:
 241
 242         ModuleDCCAllow()
 243                 : cmd(this)
 244         {
 245                 Conf = new ConfigReader;
 246                 ext = new SimpleExtItem<dccallowlist>("dccallow", this);
 247                 ServerInstance->Extensions.Register(ext);
 248                 ServerInstance->AddCommand(&cmd);
 249                 ReadFileConf();
 250                 Implementation eventlist[] = { I_OnUserPreMessage, I_OnUserPreNotice, I_OnUserQuit, I_OnUserPreNick, I_OnRehash };
 251                 ServerInstance->Modules->Attach(eventlist, this, 5);
 252         }
 253
 254
 255         virtual void OnRehash(User* user)
 256         {
 257                 delete Conf;
 258                 Conf = new ConfigReader;
 259                 ReadFileConf();
 260         }
 261
 262         virtual void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message)
 263         {
 264                 dccallowlist* udl = ext->get(user);
 265
 266                 // remove their DCCALLOW list if they have one
 267                 if (udl)
 268                 {
 269                         RemoveFromUserlist(user);
 270                 }
 271
 272                 // remove them from any DCCALLOW lists
 273                 // they are currently on
 274                 RemoveNick(user);
 275         }
 276
 277         virtual ModResult OnUserPreNick(User* user, const std::string &newnick)
 278         {
 279                 RemoveNick(user);
 280                 return MOD_RES_PASSTHRU;
 281         }
 282
 283         virtual ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 284         {
 285                 return OnUserPreNotice(user, dest, target_type, text, status, exempt_list);
 286         }
 287
 288         virtual ModResult OnUserPreNotice(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 289         {
 290                 if (!IS_LOCAL(user))
 291                         return MOD_RES_PASSTHRU;
 292
 293                 if (target_type == TYPE_USER)
 294                 {
 295                         User* u = (User*)dest;
 296
 297                         /* Always allow a user to dcc themselves (although... why?) */
 298                         if (user == u)
 299                                 return MOD_RES_PASSTHRU;
 300
 301                         if ((text.length()) && (text[0] == '\1'))
 302                         {
 303                                 Expire();
 304
 305                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 306                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 307
 308                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 309                                 {
 310                                         dl = ext->get(u);
 311                                         if (dl && dl->size())
 312                                         {
 313                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 314                                                         if (InspIRCd::Match(user->GetFullHost(), iter->hostmask))
 315                                                                 return MOD_RES_PASSTHRU;
 316                                         }
 317
 318                                         // tokenize
 319                                         std::stringstream ss(text);
 320                                         std::string buf;
 321                                         std::vector<std::string> tokens;
 322
 323                                         while (ss >> buf)
 324                                                 tokens.push_back(buf);
 325
 326                                         irc::string type = tokens[1].c_str();
 327
 328                                         bool blockchat = Conf->ReadFlag("dccallow", "blockchat", 0);
 329
 330                                         if (type == "SEND")
 331                                         {
 332                                                 std::string defaultaction = Conf->ReadValue("dccallow", "action", 0);
 333                                                 std::string filename = tokens[2];
 334
 335                                                 bool found = false;
 336                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 337                                                 {
 338                                                         if (InspIRCd::Match(filename, bfl[i].filemask, ascii_case_insensitive_map))
 339                                                         {
 340                                                                 /* We have a matching badfile entry, override whatever the default action is */
 341                                                                 if (bfl[i].action == "allow")
 342                                                                         return MOD_RES_PASSTHRU;
 343                                                                 else
 344                                                                 {
 345                                                                         found = true;
 346                                                                         break;
 347                                                                 }
 348                                                         }
 349                                                 }
 350
 351                                                 /* only follow the default action if no badfile matches were found above */
 352                                                 if ((!found) && (defaultaction == "allow"))
 353                                                         return MOD_RES_PASSTHRU;
 354
 355                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC SENDs from you. Your file %s was not sent.", user->nick.c_str(), u->nick.c_str(), filename.c_str());
 356                                                 u->WriteServ("NOTICE %s :%s (%s@%s) attempted to send you a file named %s, which was blocked.", u->nick.c_str(), user->nick.c_str(), user->ident.c_str(), user->dhost.c_str(), filename.c_str());
 357                                                 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.c_str(), user->nick.c_str());
 358                                                 return MOD_RES_DENY;
 359                                         }
 360                                         else if ((type == "CHAT") && (blockchat))
 361                                         {
 362                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick.c_str(), u->nick.c_str());
 363                                                 u->WriteServ("NOTICE %s :%s (%s@%s) attempted to initiate a DCC CHAT session, which was blocked.", u->nick.c_str(), user->nick.c_str(), user->ident.c_str(), user->dhost.c_str());
 364                                                 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.c_str(), user->nick.c_str());
 365                                                 return MOD_RES_DENY;
 366                                         }
 367                                 }
 368                         }
 369                 }
 370                 return MOD_RES_PASSTHRU;
 371         }
 372
 373         void Expire()
 374         {
 375                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 376                 {
 377                         User* u = (User*)(*iter);
 378                         dl = ext->get(u);
 379                         if (dl)
 380                         {
 381                                 if (dl->size())
 382                                 {
 383                                         dccallowlist::iterator iter2 = dl->begin();
 384                                         while (iter2 != dl->end())
 385                                         {
 386                                                 if (iter2->length != 0 && (iter2->set_on + iter2->length) <= ServerInstance->Time())
 387                                                 {
 388                                                         u->WriteNumeric(997, "%s %s :DCCALLOW entry for %s has expired", u->nick.c_str(), u->nick.c_str(), iter2->nickname.c_str());
 389                                                         iter2 = dl->erase(iter2);
 390                                                 }
 391                                                 else
 392                                                 {
 393                                                         ++iter2;
 394                                                 }
 395                                         }
 396                                 }
 397                         }
 398                         else
 399                         {
 400                                 RemoveFromUserlist(u);
 401                         }
 402                 }
 403         }
 404
 405         void RemoveNick(User* user)
 406         {
 407                 /* Iterate through all DCCALLOW lists and remove user */
 408                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 409                 {
 410                         User *u = (User*)(*iter);
 411                         dl = ext->get(u);
 412                         if (dl)
 413                         {
 414                                 if (dl->size())
 415                                 {
 416                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 417                                         {
 418                                                 if (i->nickname == user->nick)
 419                                                 {
 420
 421                                                         u->WriteServ("NOTICE %s :%s left the network or changed their nickname and has been removed from your DCCALLOW list", u->nick.c_str(), i->nickname.c_str());
 422                                                         u->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", u->nick.c_str(), u->nick.c_str(), i->nickname.c_str());
 423                                                         dl->erase(i);
 424                                                         break;
 425                                                 }
 426                                         }
 427                                 }
 428                         }
 429                         else
 430                         {
 431                                 RemoveFromUserlist(u);
 432                         }
 433                 }
 434         }
 435
 436         void RemoveFromUserlist(User *user)
 437         {
 438                 // remove user from userlist
 439                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 440                 {
 441                         User* u = (User*)(*j);
 442                         if (u == user)
 443                         {
 444                                 ul.erase(j);
 445                                 break;
 446                         }
 447                 }
 448         }
 449
 450         void ReadFileConf()
 451         {
 452                 bfl.clear();
 453                 for (int i = 0; i < Conf->Enumerate("banfile"); i++)
 454                 {
 455                         BannedFileList bf;
 456                         std::string fileglob = Conf->ReadValue("banfile", "pattern", i);
 457                         std::string action = Conf->ReadValue("banfile", "action", i);
 458                         bf.filemask = fileglob;
 459                         bf.action = action;
 460                         bfl.push_back(bf);
 461                 }
 462
 463         }
 464
 465         virtual ~ModuleDCCAllow()
 466         {
 467                 delete Conf;
 468                 delete ext;
 469                 Conf = NULL;
 470         }
 471
 472         virtual Version GetVersion()
 473         {
 474                 return Version("Povides support for the /DCCALLOW command", VF_COMMON | VF_VENDOR);
 475         }
 476 };
 477
 478 MODULE_INIT(ModuleDCCAllow)