src/modules/m_dccallow.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2008 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 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 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         CommandDccallow* mycommand;
 249  public:
 250
 251         ModuleDCCAllow(InspIRCd* Me)
 252                 : Module(Me)
 253         {
 254                 Conf = new ConfigReader(ServerInstance);
 255                 mycommand = new CommandDccallow(ServerInstance);
 256                 ServerInstance->AddCommand(mycommand);
 257                 ReadFileConf();
 258                 Implementation eventlist[] = { I_OnUserPreMessage, I_OnUserPreNotice, I_OnUserQuit, I_OnUserPreNick, I_OnRehash };
 259                 ServerInstance->Modules->Attach(eventlist, this, 5);
 260         }
 261
 262
 263         virtual void OnRehash(User* user, const std::string &parameter)
 264         {
 265                 delete Conf;
 266                 Conf = new ConfigReader(ServerInstance);
 267         }
 268
 269         virtual void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message)
 270         {
 271                 dccallowlist* dl;
 272
 273                 // remove their DCCALLOW list if they have one
 274                 user->GetExt("dccallow_list", dl);
 275                 if (dl)
 276                 {
 277                         delete dl;
 278                         user->Shrink("dccallow_list");
 279                         RemoveFromUserlist(user);
 280                 }
 281
 282                 // remove them from any DCCALLOW lists
 283                 // they are currently on
 284                 RemoveNick(user);
 285         }
 286
 287
 288         virtual int OnUserPreNick(User* user, const std::string &newnick)
 289         {
 290                 RemoveNick(user);
 291                 return 0;
 292         }
 293
 294         virtual int OnUserPreMessage(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 295         {
 296                 return OnUserPreNotice(user, dest, target_type, text, status, exempt_list);
 297         }
 298
 299         virtual int OnUserPreNotice(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 300         {
 301                 if (!IS_LOCAL(user))
 302                         return 0;
 303
 304                 if (target_type == TYPE_USER)
 305                 {
 306                         User* u = (User*)dest;
 307
 308                         /* Always allow a user to dcc themselves (although... why?) */
 309                         if (user == u)
 310                                 return 0;
 311
 312                         if ((text.length()) && (text[0] == '\1'))
 313                         {
 314                                 Expire();
 315
 316                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 317                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 318
 319                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 320                                 {
 321                                         u->GetExt("dccallow_list", dl);
 322
 323                                         if (dl && dl->size())
 324                                         {
 325                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 326                                                         if (ServerInstance->MatchText(user->GetFullHost(), iter->hostmask))
 327                                                                 return 0;
 328                                         }
 329
 330                                         // tokenize
 331                                         std::stringstream ss(text);
 332                                         std::string buf;
 333                                         std::vector<std::string> tokens;
 334
 335                                         while (ss >> buf)
 336                                                 tokens.push_back(buf);
 337
 338                                         irc::string type = tokens[1].c_str();
 339
 340                                         bool blockchat = Conf->ReadFlag("dccallow", "blockchat", 0);
 341
 342                                         if (type == "SEND")
 343                                         {
 344                                                 std::string defaultaction = Conf->ReadValue("dccallow", "action", 0);
 345                                                 std::string filename = tokens[2];
 346
 347                                                 if (defaultaction == "allow")
 348                                                         return 0;
 349
 350                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 351                                                 {
 352                                                         if (ServerInstance->MatchText(filename, bfl[i].filemask))
 353                                                         {
 354                                                                 if (bfl[i].action == "allow")
 355                                                                         return 0;
 356                                                         }
 357                                                         else
 358                                                         {
 359                                                                 if (defaultaction == "allow")
 360                                                                         return 0;
 361                                                         }
 362                                                         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());
 363                                                         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());
 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, user->nick);
 365                                                         return 1;
 366                                                 }
 367                                         }
 368                                         else if ((type == "CHAT") && (blockchat))
 369                                         {
 370                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick, u->nick);
 371                                                 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);
 372                                                 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);
 373                                                 return 1;
 374                                         }
 375                                 }
 376                         }
 377                 }
 378                 return 0;
 379         }
 380
 381         void Expire()
 382         {
 383                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 384                 {
 385                         User* u = (User*)(*iter);
 386                         u->GetExt("dccallow_list", dl);
 387
 388                         if (dl)
 389                         {
 390                                 if (dl->size())
 391                                 {
 392                                         dccallowlist::iterator iter = dl->begin();
 393                                         while (iter != dl->end())
 394                                         {
 395                                                 if ((iter->set_on + iter->length) <= ServerInstance->Time())
 396                                                 {
 397                                                         u->WriteServ("997 %s %s :DCCALLOW entry for %s has expired", u->nick, u->nick, iter->nickname.c_str());
 398                                                         iter = dl->erase(iter);
 399                                                 }
 400                                                 else
 401                                                 {
 402                                                         ++iter;
 403                                                 }
 404                                         }
 405                                 }
 406                         }
 407                         else
 408                         {
 409                                 RemoveFromUserlist(u);
 410                         }
 411                 }
 412         }
 413
 414         void RemoveNick(User* user)
 415         {
 416                 /* Iterate through all DCCALLOW lists and remove user */
 417                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 418                 {
 419                         User *u = (User*)(*iter);
 420                         u->GetExt("dccallow_list", dl);
 421
 422                         if (dl)
 423                         {
 424                                 if (dl->size())
 425                                 {
 426                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 427                                         {
 428                                                 if (i->nickname == user->nick)
 429                                                 {
 430
 431                                                         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());
 432                                                         u->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", u->nick, u->nick, i->nickname.c_str());
 433                                                         dl->erase(i);
 434                                                         break;
 435                                                 }
 436                                         }
 437                                 }
 438                         }
 439                         else
 440                         {
 441                                 RemoveFromUserlist(u);
 442                         }
 443                 }
 444         }
 445
 446         void RemoveFromUserlist(User *user)
 447         {
 448                 // remove user from userlist
 449                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 450                 {
 451                         User* u = (User*)(*j);
 452                         if (u == user)
 453                         {
 454                                 ul.erase(j);
 455                                 break;
 456                         }
 457                 }
 458         }
 459
 460         void ReadFileConf()
 461         {
 462                 bfl.clear();
 463                 for (int i = 0; i < Conf->Enumerate("banfile"); i++)
 464                 {
 465                         BannedFileList bf;
 466                         std::string fileglob = Conf->ReadValue("banfile", "pattern", i);
 467                         std::string action = Conf->ReadValue("banfile", "action", i);
 468                         bf.filemask = fileglob;
 469                         bf.action = action;
 470                         bfl.push_back(bf);
 471                 }
 472
 473         }
 474
 475         virtual ~ModuleDCCAllow()
 476         {
 477         }
 478
 479         virtual Version GetVersion()
 480         {
 481                 return Version(1, 1, 0, 0, VF_COMMON | VF_VENDOR, API_VERSION);
 482         }
 483 };
 484
 485 MODULE_INIT(ModuleDCCAllow)