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, Module* parent) : Command(Me, parent, "DCCALLOW", 0, 0)
  51         {
  52                 syntax = "{[+|-]<nick> <time>|HELP|LIST}";
  53                 /* XXX we need to fix this so it can work with translation stuff (i.e. move +- into a seperate param */
  54         }
  55
  56         CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  57         {
  58                 /* syntax: DCCALLOW [+|-]<nick> (<time>) */
  59                 if (!parameters.size())
  60                 {
  61                         // display current DCCALLOW list
  62                         DisplayDCCAllowList(user);
  63                         return CMD_FAILURE;
  64                 }
  65                 else if (parameters.size() > 0)
  66                 {
  67                         char action = *parameters[0].c_str();
  68
  69                         // if they didn't specify an action, this is probably a command
  70                         if (action != '+' && action != '-')
  71                         {
  72                                 if (!strcasecmp(parameters[0].c_str(), "LIST"))
  73                                 {
  74                                         // list current DCCALLOW list
  75                                         DisplayDCCAllowList(user);
  76                                         return CMD_FAILURE;
  77                                 }
  78                                 else if (!strcasecmp(parameters[0].c_str(), "HELP"))
  79                                 {
  80                                         // display help
  81                                         DisplayHelp(user);
  82                                         return CMD_FAILURE;
  83                                 }
  84                                 else
  85                                 {
  86                                         user->WriteNumeric(998, "%s :DCCALLOW command not understood. For help on DCCALLOW, type /DCCALLOW HELP", user->nick.c_str());
  87                                         return CMD_FAILURE;
  88                                 }
  89                         }
  90
  91                         std::string nick = parameters[0].substr(1);
  92                         User *target = ServerInstance->FindNick(nick);
  93
  94                         if (target)
  95                         {
  96
  97                                 if (action == '-')
  98                                 {
  99                                         // check if it contains any entries
 100                                         if (user->GetExt("dccallow_list", dl))
 101                                         {
 102                                                 for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 103                                                 {
 104                                                         // search through list
 105                                                         if (i->nickname == target->nick)
 106                                                         {
 107                                                                 dl->erase(i);
 108                                                                 user->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 109                                                                 break;
 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                                         if (target == user)
 133                                         {
 134                                                 user->WriteNumeric(996, "%s %s :You cannot add yourself to your own DCCALLOW list!", user->nick.c_str(), user->nick.c_str());
 135                                                 return CMD_FAILURE;
 136                                         }
 137
 138                                         if (!user->GetExt("dccallow_list", dl))
 139                                         {
 140                                                 dl = new dccallowlist;
 141                                                 user->Extend("dccallow_list", dl);
 142                                                 // add this user to the userlist
 143                                                 ul.push_back(user);
 144                                         }
 145
 146                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 147                                         {
 148                                                 if (k->nickname == target->nick)
 149                                                 {
 150                                                         user->WriteNumeric(996, "%s %s :%s is already on your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 151                                                         return CMD_FAILURE;
 152                                                 }
 153                                         }
 154
 155                                         std::string mask = std::string(target->nick)+"!"+std::string(target->ident)+"@"+std::string(target->dhost);
 156                                         std::string default_length = Conf->ReadValue("dccallow", "length", 0);
 157
 158                                         long length;
 159                                         if (parameters.size() < 2)
 160                                         {
 161                                                 length = ServerInstance->Duration(default_length);
 162                                         }
 163                                         else if (!atoi(parameters[1].c_str()))
 164                                         {
 165                                                 length = 0;
 166                                         }
 167                                         else
 168                                         {
 169                                                 length = ServerInstance->Duration(parameters[1]);
 170                                         }
 171
 172                                         if (!ServerInstance->IsValidMask(mask.c_str()))
 173                                         {
 174                                                 return CMD_FAILURE;
 175                                         }
 176
 177                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 178
 179                                         if (length > 0)
 180                                         {
 181                                                 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);
 182                                         }
 183                                         else
 184                                         {
 185                                                 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());
 186                                         }
 187
 188                                         /* route it. */
 189                                         return CMD_SUCCESS;
 190                                 }
 191                         }
 192                         else
 193                         {
 194                                 // nick doesn't exist
 195                                 user->WriteNumeric(401, "%s %s :No such nick/channel", user->nick.c_str(), nick.c_str());
 196                                 return CMD_FAILURE;
 197                         }
 198                 }
 199                 return CMD_FAILURE;
 200         }
 201
 202         void DisplayHelp(User* user)
 203         {
 204                 user->WriteNumeric(998, "%s :DCCALLOW [<+|->nick [time]] [list] [help]", user->nick.c_str());
 205                 user->WriteNumeric(998, "%s :You may allow DCCs from specific users by specifying a", user->nick.c_str());
 206                 user->WriteNumeric(998, "%s :DCC allow for the user you want to receive DCCs from.", user->nick.c_str());
 207                 user->WriteNumeric(998, "%s :For example, to allow the user Brain to send you inspircd.exe", user->nick.c_str());
 208                 user->WriteNumeric(998, "%s :you would type:", user->nick.c_str());
 209                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain", user->nick.c_str());
 210                 user->WriteNumeric(998, "%s :Brain would then be able to send you files. They would have to", user->nick.c_str());
 211                 user->WriteNumeric(998, "%s :resend the file again if the server gave them an error message", user->nick.c_str());
 212                 user->WriteNumeric(998, "%s :before you added them to your DCCALLOW list.", user->nick.c_str());
 213                 user->WriteNumeric(998, "%s :DCCALLOW entries will be temporary by default, if you want to add", user->nick.c_str());
 214                 user->WriteNumeric(998, "%s :them to your DCCALLOW list until you leave IRC, type:", user->nick.c_str());
 215                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain 0", user->nick.c_str());
 216                 user->WriteNumeric(998, "%s :To remove the user from your DCCALLOW list, type:", user->nick.c_str());
 217                 user->WriteNumeric(998, "%s :/DCCALLOW -Brain", user->nick.c_str());
 218                 user->WriteNumeric(998, "%s :To see the users in your DCCALLOW list, type:", user->nick.c_str());
 219                 user->WriteNumeric(998, "%s :/DCCALLOW LIST", user->nick.c_str());
 220                 user->WriteNumeric(998, "%s :NOTE: If the user leaves IRC or changes their nickname", user->nick.c_str());
 221                 user->WriteNumeric(998, "%s :  they will be removed from your DCCALLOW list.", user->nick.c_str());
 222                 user->WriteNumeric(998, "%s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick.c_str());
 223                 user->WriteNumeric(999, "%s :End of DCCALLOW HELP", user->nick.c_str());
 224         }
 225
 226         void DisplayDCCAllowList(User* user)
 227         {
 228                  // display current DCCALLOW list
 229                 user->WriteNumeric(990, "%s :Users on your DCCALLOW list:", user->nick.c_str());
 230
 231                 if (user->GetExt("dccallow_list", dl))
 232                 {
 233                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 234                         {
 235                                 user->WriteNumeric(991, "%s %s :%s (%s)", user->nick.c_str(), user->nick.c_str(), c->nickname.c_str(), c->hostmask.c_str());
 236                         }
 237                 }
 238
 239                 user->WriteNumeric(992, "%s :End of DCCALLOW list", user->nick.c_str());
 240         }
 241
 242 };
 243
 244 class ModuleDCCAllow : public Module
 245 {
 246         CommandDccallow cmd;
 247  public:
 248
 249         ModuleDCCAllow(InspIRCd* Me)
 250                 : Module(Me), cmd(Me, this)
 251         {
 252                 Conf = new ConfigReader(ServerInstance);
 253                 ServerInstance->AddCommand(&cmd);
 254                 ReadFileConf();
 255                 Implementation eventlist[] = { I_OnUserPreMessage, I_OnUserPreNotice, I_OnUserQuit, I_OnUserPreNick, I_OnRehash };
 256                 ServerInstance->Modules->Attach(eventlist, this, 5);
 257         }
 258
 259
 260         virtual void OnRehash(User* user)
 261         {
 262                 delete Conf;
 263                 Conf = new ConfigReader(ServerInstance);
 264                 ReadFileConf();
 265         }
 266
 267         virtual void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message)
 268         {
 269                 dccallowlist* udl;
 270
 271                 // remove their DCCALLOW list if they have one
 272                 if (user->GetExt("dccallow_list", udl))
 273                 {
 274                         delete udl;
 275                         user->Shrink("dccallow_list");
 276                         RemoveFromUserlist(user);
 277                 }
 278
 279                 // remove them from any DCCALLOW lists
 280                 // they are currently on
 281                 RemoveNick(user);
 282         }
 283
 284
 285         virtual ModResult OnUserPreNick(User* user, const std::string &newnick)
 286         {
 287                 RemoveNick(user);
 288                 return MOD_RES_PASSTHRU;
 289         }
 290
 291         virtual ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 292         {
 293                 return OnUserPreNotice(user, dest, target_type, text, status, exempt_list);
 294         }
 295
 296         virtual ModResult OnUserPreNotice(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 297         {
 298                 if (!IS_LOCAL(user))
 299                         return MOD_RES_PASSTHRU;
 300
 301                 if (target_type == TYPE_USER)
 302                 {
 303                         User* u = (User*)dest;
 304
 305                         /* Always allow a user to dcc themselves (although... why?) */
 306                         if (user == u)
 307                                 return MOD_RES_PASSTHRU;
 308
 309                         if ((text.length()) && (text[0] == '\1'))
 310                         {
 311                                 Expire();
 312
 313                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 314                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 315
 316                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 317                                 {
 318                                         if (u->GetExt("dccallow_list", dl) && dl->size())
 319                                         {
 320                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 321                                                         if (InspIRCd::Match(user->GetFullHost(), iter->hostmask))
 322                                                                 return MOD_RES_PASSTHRU;
 323                                         }
 324
 325                                         // tokenize
 326                                         std::stringstream ss(text);
 327                                         std::string buf;
 328                                         std::vector<std::string> tokens;
 329
 330                                         while (ss >> buf)
 331                                                 tokens.push_back(buf);
 332
 333                                         irc::string type = tokens[1].c_str();
 334
 335                                         bool blockchat = Conf->ReadFlag("dccallow", "blockchat", 0);
 336
 337                                         if (type == "SEND")
 338                                         {
 339                                                 std::string defaultaction = Conf->ReadValue("dccallow", "action", 0);
 340                                                 std::string filename = tokens[2];
 341
 342                                                 bool found = false;
 343                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 344                                                 {
 345                                                         if (InspIRCd::Match(filename, bfl[i].filemask, ascii_case_insensitive_map))
 346                                                         {
 347                                                                 /* We have a matching badfile entry, override whatever the default action is */
 348                                                                 if (bfl[i].action == "allow")
 349                                                                         return MOD_RES_PASSTHRU;
 350                                                                 else
 351                                                                 {
 352                                                                         found = true;
 353                                                                         break;
 354                                                                 }
 355                                                         }
 356                                                 }
 357
 358                                                 /* only follow the default action if no badfile matches were found above */
 359                                                 if ((!found) && (defaultaction == "allow"))
 360                                                         return MOD_RES_PASSTHRU;
 361
 362                                                 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());
 363                                                 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());
 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                                         else if ((type == "CHAT") && (blockchat))
 368                                         {
 369                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick.c_str(), u->nick.c_str());
 370                                                 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());
 371                                                 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());
 372                                                 return MOD_RES_DENY;
 373                                         }
 374                                 }
 375                         }
 376                 }
 377                 return MOD_RES_PASSTHRU;
 378         }
 379
 380         void Expire()
 381         {
 382                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 383                 {
 384                         User* u = (User*)(*iter);
 385                         if (u->GetExt("dccallow_list", dl))
 386                         {
 387                                 if (dl->size())
 388                                 {
 389                                         dccallowlist::iterator iter2 = dl->begin();
 390                                         while (iter2 != dl->end())
 391                                         {
 392                                                 if (iter2->length != 0 && (iter2->set_on + iter2->length) <= ServerInstance->Time())
 393                                                 {
 394                                                         u->WriteNumeric(997, "%s %s :DCCALLOW entry for %s has expired", u->nick.c_str(), u->nick.c_str(), iter2->nickname.c_str());
 395                                                         iter2 = dl->erase(iter2);
 396                                                 }
 397                                                 else
 398                                                 {
 399                                                         ++iter2;
 400                                                 }
 401                                         }
 402                                 }
 403                         }
 404                         else
 405                         {
 406                                 RemoveFromUserlist(u);
 407                         }
 408                 }
 409         }
 410
 411         void RemoveNick(User* user)
 412         {
 413                 /* Iterate through all DCCALLOW lists and remove user */
 414                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 415                 {
 416                         User *u = (User*)(*iter);
 417                         if (u->GetExt("dccallow_list", dl))
 418                         {
 419                                 if (dl->size())
 420                                 {
 421                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 422                                         {
 423                                                 if (i->nickname == user->nick)
 424                                                 {
 425
 426                                                         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());
 427                                                         u->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", u->nick.c_str(), u->nick.c_str(), i->nickname.c_str());
 428                                                         dl->erase(i);
 429                                                         break;
 430                                                 }
 431                                         }
 432                                 }
 433                         }
 434                         else
 435                         {
 436                                 RemoveFromUserlist(u);
 437                         }
 438                 }
 439         }
 440
 441         void RemoveFromUserlist(User *user)
 442         {
 443                 // remove user from userlist
 444                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 445                 {
 446                         User* u = (User*)(*j);
 447                         if (u == user)
 448                         {
 449                                 ul.erase(j);
 450                                 break;
 451                         }
 452                 }
 453         }
 454
 455         void ReadFileConf()
 456         {
 457                 bfl.clear();
 458                 for (int i = 0; i < Conf->Enumerate("banfile"); i++)
 459                 {
 460                         BannedFileList bf;
 461                         std::string fileglob = Conf->ReadValue("banfile", "pattern", i);
 462                         std::string action = Conf->ReadValue("banfile", "action", i);
 463                         bf.filemask = fileglob;
 464                         bf.action = action;
 465                         bfl.push_back(bf);
 466                 }
 467
 468         }
 469
 470         virtual ~ModuleDCCAllow()
 471         {
 472                 delete Conf;
 473                 Conf = NULL;
 474         }
 475
 476         virtual Version GetVersion()
 477         {
 478                 return Version("$Id$", VF_COMMON | VF_VENDOR, API_VERSION);
 479         }
 480 };
 481
 482 MODULE_INIT(ModuleDCCAllow)