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
  47 class CommandDccallow : public Command
  48 {
  49  public:
  50         CommandDccallow(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 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                                         if (user->GetExt("dccallow_list", dl))
 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->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 110                                                                 break;
 111                                                         }
 112                                                 }
 113                                         }
 114                                         else
 115                                         {
 116                                                 delete  dl;
 117                                                 user->Shrink("dccallow_list");
 118
 119                                                 // remove from userlist
 120                                                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 121                                                 {
 122                                                         User* u = (User*)(*j);
 123                                                         if (u == user)
 124                                                         {
 125                                                                 ul.erase(j);
 126                                                                 break;
 127                                                         }
 128                                                 }
 129                                         }
 130                                 }
 131                                 else if (action == '+')
 132                                 {
 133                                         if (target == user)
 134                                         {
 135                                                 user->WriteNumeric(996, "%s %s :You cannot add yourself to your own DCCALLOW list!", user->nick.c_str(), user->nick.c_str());
 136                                                 return CMD_FAILURE;
 137                                         }
 138
 139                                         if (!user->GetExt("dccallow_list", dl))
 140                                         {
 141                                                 dl = new dccallowlist;
 142                                                 user->Extend("dccallow_list", dl);
 143                                                 // add this user to the userlist
 144                                                 ul.push_back(user);
 145                                         }
 146
 147                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 148                                         {
 149                                                 if (k->nickname == target->nick)
 150                                                 {
 151                                                         user->WriteNumeric(996, "%s %s :%s is already on your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 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 (parameters.size() < 2)
 161                                         {
 162                                                 length = ServerInstance->Duration(default_length);
 163                                         }
 164                                         else if (!atoi(parameters[1].c_str()))
 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->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);
 183                                         }
 184                                         else
 185                                         {
 186                                                 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());
 187                                         }
 188
 189                                         /* route it. */
 190                                         return CMD_SUCCESS;
 191                                 }
 192                         }
 193                         else
 194                         {
 195                                 // nick doesn't exist
 196                                 user->WriteNumeric(401, "%s %s :No such nick/channel", user->nick.c_str(), nick.c_str());
 197                                 return CMD_FAILURE;
 198                         }
 199                 }
 200                 return CMD_FAILURE;
 201         }
 202
 203         void DisplayHelp(User* user)
 204         {
 205                 user->WriteNumeric(998, "%s :DCCALLOW [<+|->nick [time]] [list] [help]", user->nick.c_str());
 206                 user->WriteNumeric(998, "%s :You may allow DCCs from specific users by specifying a", user->nick.c_str());
 207                 user->WriteNumeric(998, "%s :DCC allow for the user you want to receive DCCs from.", user->nick.c_str());
 208                 user->WriteNumeric(998, "%s :For example, to allow the user Brain to send you inspircd.exe", user->nick.c_str());
 209                 user->WriteNumeric(998, "%s :you would type:", user->nick.c_str());
 210                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain", user->nick.c_str());
 211                 user->WriteNumeric(998, "%s :Brain would then be able to send you files. They would have to", user->nick.c_str());
 212                 user->WriteNumeric(998, "%s :resend the file again if the server gave them an error message", user->nick.c_str());
 213                 user->WriteNumeric(998, "%s :before you added them to your DCCALLOW list.", user->nick.c_str());
 214                 user->WriteNumeric(998, "%s :DCCALLOW entries will be temporary by default, if you want to add", user->nick.c_str());
 215                 user->WriteNumeric(998, "%s :them to your DCCALLOW list until you leave IRC, type:", user->nick.c_str());
 216                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain 0", user->nick.c_str());
 217                 user->WriteNumeric(998, "%s :To remove the user from your DCCALLOW list, type:", user->nick.c_str());
 218                 user->WriteNumeric(998, "%s :/DCCALLOW -Brain", user->nick.c_str());
 219                 user->WriteNumeric(998, "%s :To see the users in your DCCALLOW list, type:", user->nick.c_str());
 220                 user->WriteNumeric(998, "%s :/DCCALLOW LIST", user->nick.c_str());
 221                 user->WriteNumeric(998, "%s :NOTE: If the user leaves IRC or changes their nickname", user->nick.c_str());
 222                 user->WriteNumeric(998, "%s :  they will be removed from your DCCALLOW list.", user->nick.c_str());
 223                 user->WriteNumeric(998, "%s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick.c_str());
 224                 user->WriteNumeric(999, "%s :End of DCCALLOW HELP", user->nick.c_str());
 225         }
 226
 227         void DisplayDCCAllowList(User* user)
 228         {
 229                  // display current DCCALLOW list
 230                 user->WriteNumeric(990, "%s :Users on your DCCALLOW list:", user->nick.c_str());
 231
 232                 if (user->GetExt("dccallow_list", dl))
 233                 {
 234                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 235                         {
 236                                 user->WriteNumeric(991, "%s %s :%s (%s)", user->nick.c_str(), user->nick.c_str(), c->nickname.c_str(), c->hostmask.c_str());
 237                         }
 238                 }
 239
 240                 user->WriteNumeric(992, "%s :End of DCCALLOW list", user->nick.c_str());
 241         }
 242
 243 };
 244
 245 class ModuleDCCAllow : public Module
 246 {
 247         CommandDccallow* mycommand;
 248  public:
 249
 250         ModuleDCCAllow(InspIRCd* Me)
 251                 : Module(Me)
 252         {
 253                 Conf = new ConfigReader(ServerInstance);
 254                 mycommand = new CommandDccallow(ServerInstance);
 255                 ServerInstance->AddCommand(mycommand);
 256                 ReadFileConf();
 257                 Implementation eventlist[] = { I_OnUserPreMessage, I_OnUserPreNotice, I_OnUserQuit, I_OnUserPreNick, I_OnRehash };
 258                 ServerInstance->Modules->Attach(eventlist, this, 5);
 259         }
 260
 261
 262         virtual void OnRehash(User* user)
 263         {
 264                 delete Conf;
 265                 Conf = new ConfigReader(ServerInstance);
 266                 ReadFileConf();
 267         }
 268
 269         virtual void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message)
 270         {
 271                 dccallowlist* udl;
 272
 273                 // remove their DCCALLOW list if they have one
 274                 if (user->GetExt("dccallow_list", udl))
 275                 {
 276                         delete udl;
 277                         user->Shrink("dccallow_list");
 278                         RemoveFromUserlist(user);
 279                 }
 280
 281                 // remove them from any DCCALLOW lists
 282                 // they are currently on
 283                 RemoveNick(user);
 284         }
 285
 286
 287         virtual int OnUserPreNick(User* user, const std::string &newnick)
 288         {
 289                 RemoveNick(user);
 290                 return 0;
 291         }
 292
 293         virtual int OnUserPreMessage(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 294         {
 295                 return OnUserPreNotice(user, dest, target_type, text, status, exempt_list);
 296         }
 297
 298         virtual int OnUserPreNotice(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 299         {
 300                 if (!IS_LOCAL(user))
 301                         return 0;
 302
 303                 if (target_type == TYPE_USER)
 304                 {
 305                         User* u = (User*)dest;
 306
 307                         /* Always allow a user to dcc themselves (although... why?) */
 308                         if (user == u)
 309                                 return 0;
 310
 311                         if ((text.length()) && (text[0] == '\1'))
 312                         {
 313                                 Expire();
 314
 315                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 316                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 317
 318                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 319                                 {
 320                                         if (u->GetExt("dccallow_list", dl) && dl->size())
 321                                         {
 322                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 323                                                         if (InspIRCd::Match(user->GetFullHost(), iter->hostmask))
 324                                                                 return 0;
 325                                         }
 326
 327                                         // tokenize
 328                                         std::stringstream ss(text);
 329                                         std::string buf;
 330                                         std::vector<std::string> tokens;
 331
 332                                         while (ss >> buf)
 333                                                 tokens.push_back(buf);
 334
 335                                         irc::string type = tokens[1].c_str();
 336
 337                                         bool blockchat = Conf->ReadFlag("dccallow", "blockchat", 0);
 338
 339                                         if (type == "SEND")
 340                                         {
 341                                                 std::string defaultaction = Conf->ReadValue("dccallow", "action", 0);
 342                                                 std::string filename = tokens[2];
 343
 344                                                 bool found = false;
 345                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 346                                                 {
 347                                                         if (InspIRCd::Match(filename, bfl[i].filemask, ascii_case_insensitive_map))
 348                                                         {
 349                                                                 /* We have a matching badfile entry, override whatever the default action is */
 350                                                                 if (bfl[i].action == "allow")
 351                                                                         return 0;
 352                                                                 else
 353                                                                 {
 354                                                                         found = true;
 355                                                                         break;
 356                                                                 }
 357                                                         }
 358                                                 }
 359
 360                                                 /* only follow the default action if no badfile matches were found above */
 361                                                 if ((!found) && (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.c_str(), u->nick.c_str(), filename.c_str());
 365                                                 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());
 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.c_str(), user->nick.c_str());
 367                                                 return 1;
 368                                         }
 369                                         else if ((type == "CHAT") && (blockchat))
 370                                         {
 371                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick.c_str(), u->nick.c_str());
 372                                                 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());
 373                                                 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());
 374                                                 return 1;
 375                                         }
 376                                 }
 377                         }
 378                 }
 379                 return 0;
 380         }
 381
 382         void Expire()
 383         {
 384                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 385                 {
 386                         User* u = (User*)(*iter);
 387                         if (u->GetExt("dccallow_list", dl))
 388                         {
 389                                 if (dl->size())
 390                                 {
 391                                         dccallowlist::iterator iter2 = dl->begin();
 392                                         while (iter2 != dl->end())
 393                                         {
 394                                                 if (iter2->length != 0 && (iter2->set_on + iter2->length) <= ServerInstance->Time())
 395                                                 {
 396                                                         u->WriteNumeric(997, "%s %s :DCCALLOW entry for %s has expired", u->nick.c_str(), u->nick.c_str(), iter2->nickname.c_str());
 397                                                         iter2 = dl->erase(iter2);
 398                                                 }
 399                                                 else
 400                                                 {
 401                                                         ++iter2;
 402                                                 }
 403                                         }
 404                                 }
 405                         }
 406                         else
 407                         {
 408                                 RemoveFromUserlist(u);
 409                         }
 410                 }
 411         }
 412
 413         void RemoveNick(User* user)
 414         {
 415                 /* Iterate through all DCCALLOW lists and remove user */
 416                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 417                 {
 418                         User *u = (User*)(*iter);
 419                         if (u->GetExt("dccallow_list", dl))
 420                         {
 421                                 if (dl->size())
 422                                 {
 423                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 424                                         {
 425                                                 if (i->nickname == user->nick)
 426                                                 {
 427
 428                                                         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());
 429                                                         u->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", u->nick.c_str(), u->nick.c_str(), i->nickname.c_str());
 430                                                         dl->erase(i);
 431                                                         break;
 432                                                 }
 433                                         }
 434                                 }
 435                         }
 436                         else
 437                         {
 438                                 RemoveFromUserlist(u);
 439                         }
 440                 }
 441         }
 442
 443         void RemoveFromUserlist(User *user)
 444         {
 445                 // remove user from userlist
 446                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 447                 {
 448                         User* u = (User*)(*j);
 449                         if (u == user)
 450                         {
 451                                 ul.erase(j);
 452                                 break;
 453                         }
 454                 }
 455         }
 456
 457         void ReadFileConf()
 458         {
 459                 bfl.clear();
 460                 for (int i = 0; i < Conf->Enumerate("banfile"); i++)
 461                 {
 462                         BannedFileList bf;
 463                         std::string fileglob = Conf->ReadValue("banfile", "pattern", i);
 464                         std::string action = Conf->ReadValue("banfile", "action", i);
 465                         bf.filemask = fileglob;
 466                         bf.action = action;
 467                         bfl.push_back(bf);
 468                 }
 469
 470         }
 471
 472         virtual ~ModuleDCCAllow()
 473         {
 474         }
 475
 476         virtual Version GetVersion()
 477         {
 478                 return Version("$Id$", VF_COMMON | VF_VENDOR, API_VERSION);
 479         }
 480 };
 481
 482 MODULE_INIT(ModuleDCCAllow)