src/modules/m_dccallow.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2010 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 class BannedFileList
  19 {
  20  public:
  21         std::string filemask;
  22         std::string action;
  23 };
  24
  25 class DCCAllow
  26 {
  27  public:
  28         std::string nickname;
  29         std::string hostmask;
  30         time_t set_on;
  31         long length;
  32
  33         DCCAllow() { }
  34
  35         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) { }
  36 };
  37
  38 typedef std::vector<User *> userlist;
  39 userlist ul;
  40 typedef std::vector<DCCAllow> dccallowlist;
  41 dccallowlist* dl;
  42 typedef std::vector<BannedFileList> bannedfilelist;
  43 bannedfilelist bfl;
  44 SimpleExtItem<dccallowlist>* ext;
  45
  46 class CommandDccallow : public Command
  47 {
  48  public:
  49         CommandDccallow(Module* parent) : Command(parent, "DCCALLOW", 0)
  50         {
  51                 syntax = "{[+|-]<nick> <time>|HELP|LIST}";
  52                 /* XXX we need to fix this so it can work with translation stuff (i.e. move +- into a seperate param */
  53         }
  54
  55         CmdResult Handle(const std::vector<std::string> &parameters, User *user)
  56         {
  57                 /* syntax: DCCALLOW [+|-]<nick> (<time>) */
  58                 if (!parameters.size())
  59                 {
  60                         // display current DCCALLOW list
  61                         DisplayDCCAllowList(user);
  62                         return CMD_FAILURE;
  63                 }
  64                 else if (parameters.size() > 0)
  65                 {
  66                         char action = *parameters[0].c_str();
  67
  68                         // if they didn't specify an action, this is probably a command
  69                         if (action != '+' && action != '-')
  70                         {
  71                                 if (!strcasecmp(parameters[0].c_str(), "LIST"))
  72                                 {
  73                                         // list current DCCALLOW list
  74                                         DisplayDCCAllowList(user);
  75                                         return CMD_FAILURE;
  76                                 }
  77                                 else if (!strcasecmp(parameters[0].c_str(), "HELP"))
  78                                 {
  79                                         // display help
  80                                         DisplayHelp(user);
  81                                         return CMD_FAILURE;
  82                                 }
  83                                 else
  84                                 {
  85                                         user->WriteNumeric(998, "%s :DCCALLOW command not understood. For help on DCCALLOW, type /DCCALLOW HELP", user->nick.c_str());
  86                                         return CMD_FAILURE;
  87                                 }
  88                         }
  89
  90                         std::string nick = parameters[0].substr(1);
  91                         User *target = ServerInstance->FindNick(nick);
  92
  93                         if (target)
  94                         {
  95
  96                                 if (action == '-')
  97                                 {
  98                                         // check if it contains any entries
  99                                         dl = ext->get(user);
 100                                         if (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                                 }
 114                                 else if (action == '+')
 115                                 {
 116                                         if (target == user)
 117                                         {
 118                                                 user->WriteNumeric(996, "%s %s :You cannot add yourself to your own DCCALLOW list!", user->nick.c_str(), user->nick.c_str());
 119                                                 return CMD_FAILURE;
 120                                         }
 121
 122                                         dl = ext->get(user);
 123                                         if (!dl)
 124                                         {
 125                                                 dl = new dccallowlist;
 126                                                 ext->set(user, dl);
 127                                                 // add this user to the userlist
 128                                                 ul.push_back(user);
 129                                         }
 130
 131                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 132                                         {
 133                                                 if (k->nickname == target->nick)
 134                                                 {
 135                                                         user->WriteNumeric(996, "%s %s :%s is already on your DCCALLOW list", user->nick.c_str(), user->nick.c_str(), target->nick.c_str());
 136                                                         return CMD_FAILURE;
 137                                                 }
 138                                         }
 139
 140                                         std::string mask = std::string(target->nick)+"!"+std::string(target->ident)+"@"+std::string(target->dhost);
 141                                         ConfigReader Conf;
 142                                         std::string default_length = Conf.ReadValue("dccallow", "length", 0);
 143
 144                                         long length;
 145                                         if (parameters.size() < 2)
 146                                         {
 147                                                 length = ServerInstance->Duration(default_length);
 148                                         }
 149                                         else if (!atoi(parameters[1].c_str()))
 150                                         {
 151                                                 length = 0;
 152                                         }
 153                                         else
 154                                         {
 155                                                 length = ServerInstance->Duration(parameters[1]);
 156                                         }
 157
 158                                         if (!ServerInstance->IsValidMask(mask.c_str()))
 159                                         {
 160                                                 return CMD_FAILURE;
 161                                         }
 162
 163                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 164
 165                                         if (length > 0)
 166                                         {
 167                                                 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);
 168                                         }
 169                                         else
 170                                         {
 171                                                 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());
 172                                         }
 173
 174                                         /* route it. */
 175                                         return CMD_SUCCESS;
 176                                 }
 177                         }
 178                         else
 179                         {
 180                                 // nick doesn't exist
 181                                 user->WriteNumeric(401, "%s %s :No such nick/channel", user->nick.c_str(), nick.c_str());
 182                                 return CMD_FAILURE;
 183                         }
 184                 }
 185                 return CMD_FAILURE;
 186         }
 187
 188         RouteDescriptor GetRouting(User* user, const std::vector<std::string>& parameters)
 189         {
 190                 return ROUTE_BROADCAST;
 191         }
 192
 193         void DisplayHelp(User* user)
 194         {
 195                 user->WriteNumeric(998, "%s :DCCALLOW [<+|->nick [time]] [list] [help]", user->nick.c_str());
 196                 user->WriteNumeric(998, "%s :You may allow DCCs from specific users by specifying a", user->nick.c_str());
 197                 user->WriteNumeric(998, "%s :DCC allow for the user you want to receive DCCs from.", user->nick.c_str());
 198                 user->WriteNumeric(998, "%s :For example, to allow the user Brain to send you inspircd.exe", user->nick.c_str());
 199                 user->WriteNumeric(998, "%s :you would type:", user->nick.c_str());
 200                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain", user->nick.c_str());
 201                 user->WriteNumeric(998, "%s :Brain would then be able to send you files. They would have to", user->nick.c_str());
 202                 user->WriteNumeric(998, "%s :resend the file again if the server gave them an error message", user->nick.c_str());
 203                 user->WriteNumeric(998, "%s :before you added them to your DCCALLOW list.", user->nick.c_str());
 204                 user->WriteNumeric(998, "%s :DCCALLOW entries will be temporary by default, if you want to add", user->nick.c_str());
 205                 user->WriteNumeric(998, "%s :them to your DCCALLOW list until you leave IRC, type:", user->nick.c_str());
 206                 user->WriteNumeric(998, "%s :/DCCALLOW +Brain 0", user->nick.c_str());
 207                 user->WriteNumeric(998, "%s :To remove the user from your DCCALLOW list, type:", user->nick.c_str());
 208                 user->WriteNumeric(998, "%s :/DCCALLOW -Brain", user->nick.c_str());
 209                 user->WriteNumeric(998, "%s :To see the users in your DCCALLOW list, type:", user->nick.c_str());
 210                 user->WriteNumeric(998, "%s :/DCCALLOW LIST", user->nick.c_str());
 211                 user->WriteNumeric(998, "%s :NOTE: If the user leaves IRC or changes their nickname", user->nick.c_str());
 212                 user->WriteNumeric(998, "%s :  they will be removed from your DCCALLOW list.", user->nick.c_str());
 213                 user->WriteNumeric(998, "%s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick.c_str());
 214                 user->WriteNumeric(999, "%s :End of DCCALLOW HELP", user->nick.c_str());
 215         }
 216
 217         void DisplayDCCAllowList(User* user)
 218         {
 219                  // display current DCCALLOW list
 220                 user->WriteNumeric(990, "%s :Users on your DCCALLOW list:", user->nick.c_str());
 221
 222                 dl = ext->get(user);
 223                 if (dl)
 224                 {
 225                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 226                         {
 227                                 user->WriteNumeric(991, "%s %s :%s (%s)", user->nick.c_str(), user->nick.c_str(), c->nickname.c_str(), c->hostmask.c_str());
 228                         }
 229                 }
 230
 231                 user->WriteNumeric(992, "%s :End of DCCALLOW list", user->nick.c_str());
 232         }
 233
 234 };
 235
 236 class ModuleDCCAllow : public Module
 237 {
 238         CommandDccallow cmd;
 239  public:
 240
 241         ModuleDCCAllow()
 242                 : cmd(this)
 243         {
 244                 ext = new SimpleExtItem<dccallowlist>("dccallow", this);
 245                 ServerInstance->Extensions.Register(ext);
 246                 ServerInstance->AddCommand(&cmd);
 247                 ReadFileConf();
 248                 Implementation eventlist[] = { I_OnUserPreMessage, I_OnUserPreNotice, I_OnUserQuit, I_OnUserPreNick, I_OnRehash };
 249                 ServerInstance->Modules->Attach(eventlist, this, 5);
 250         }
 251
 252
 253         virtual void OnRehash(User* user)
 254         {
 255                 ReadFileConf();
 256         }
 257
 258         virtual void OnUserQuit(User* user, const std::string &reason, const std::string &oper_message)
 259         {
 260                 dccallowlist* udl = ext->get(user);
 261
 262                 // remove their DCCALLOW list if they have one
 263                 if (udl)
 264                 {
 265                         RemoveFromUserlist(user);
 266                 }
 267
 268                 // remove them from any DCCALLOW lists
 269                 // they are currently on
 270                 RemoveNick(user);
 271         }
 272
 273         virtual ModResult OnUserPreNick(User* user, const std::string &newnick)
 274         {
 275                 RemoveNick(user);
 276                 return MOD_RES_PASSTHRU;
 277         }
 278
 279         virtual ModResult OnUserPreMessage(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 280         {
 281                 return OnUserPreNotice(user, dest, target_type, text, status, exempt_list);
 282         }
 283
 284         virtual ModResult OnUserPreNotice(User* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 285         {
 286                 if (!IS_LOCAL(user))
 287                         return MOD_RES_PASSTHRU;
 288
 289                 if (target_type == TYPE_USER)
 290                 {
 291                         User* u = (User*)dest;
 292
 293                         /* Always allow a user to dcc themselves (although... why?) */
 294                         if (user == u)
 295                                 return MOD_RES_PASSTHRU;
 296
 297                         if ((text.length()) && (text[0] == '\1'))
 298                         {
 299                                 Expire();
 300
 301                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 302                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 303
 304                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 305                                 {
 306                                         dl = ext->get(u);
 307                                         if (dl && dl->size())
 308                                         {
 309                                                 for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 310                                                         if (InspIRCd::Match(user->GetFullHost(), iter->hostmask))
 311                                                                 return MOD_RES_PASSTHRU;
 312                                         }
 313
 314                                         // tokenize
 315                                         std::stringstream ss(text);
 316                                         std::string buf;
 317                                         std::vector<std::string> tokens;
 318
 319                                         while (ss >> buf)
 320                                                 tokens.push_back(buf);
 321
 322                                         irc::string type = tokens[1].c_str();
 323
 324                                         ConfigReader Conf;
 325                                         bool blockchat = Conf.ReadFlag("dccallow", "blockchat", 0);
 326
 327                                         if (type == "SEND")
 328                                         {
 329                                                 std::string defaultaction = Conf.ReadValue("dccallow", "action", 0);
 330                                                 std::string filename = tokens[2];
 331
 332                                                 bool found = false;
 333                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 334                                                 {
 335                                                         if (InspIRCd::Match(filename, bfl[i].filemask, ascii_case_insensitive_map))
 336                                                         {
 337                                                                 /* We have a matching badfile entry, override whatever the default action is */
 338                                                                 if (bfl[i].action == "allow")
 339                                                                         return MOD_RES_PASSTHRU;
 340                                                                 else
 341                                                                 {
 342                                                                         found = true;
 343                                                                         break;
 344                                                                 }
 345                                                         }
 346                                                 }
 347
 348                                                 /* only follow the default action if no badfile matches were found above */
 349                                                 if ((!found) && (defaultaction == "allow"))
 350                                                         return MOD_RES_PASSTHRU;
 351
 352                                                 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());
 353                                                 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());
 354                                                 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());
 355                                                 return MOD_RES_DENY;
 356                                         }
 357                                         else if ((type == "CHAT") && (blockchat))
 358                                         {
 359                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick.c_str(), u->nick.c_str());
 360                                                 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());
 361                                                 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());
 362                                                 return MOD_RES_DENY;
 363                                         }
 364                                 }
 365                         }
 366                 }
 367                 return MOD_RES_PASSTHRU;
 368         }
 369
 370         void Expire()
 371         {
 372                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 373                 {
 374                         User* u = (User*)(*iter);
 375                         dl = ext->get(u);
 376                         if (dl)
 377                         {
 378                                 if (dl->size())
 379                                 {
 380                                         dccallowlist::iterator iter2 = dl->begin();
 381                                         while (iter2 != dl->end())
 382                                         {
 383                                                 if (iter2->length != 0 && (iter2->set_on + iter2->length) <= ServerInstance->Time())
 384                                                 {
 385                                                         u->WriteNumeric(997, "%s %s :DCCALLOW entry for %s has expired", u->nick.c_str(), u->nick.c_str(), iter2->nickname.c_str());
 386                                                         iter2 = dl->erase(iter2);
 387                                                 }
 388                                                 else
 389                                                 {
 390                                                         ++iter2;
 391                                                 }
 392                                         }
 393                                 }
 394                         }
 395                         else
 396                         {
 397                                 RemoveFromUserlist(u);
 398                         }
 399                 }
 400         }
 401
 402         void RemoveNick(User* user)
 403         {
 404                 /* Iterate through all DCCALLOW lists and remove user */
 405                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 406                 {
 407                         User *u = (User*)(*iter);
 408                         dl = ext->get(u);
 409                         if (dl)
 410                         {
 411                                 if (dl->size())
 412                                 {
 413                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 414                                         {
 415                                                 if (i->nickname == user->nick)
 416                                                 {
 417
 418                                                         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());
 419                                                         u->WriteNumeric(995, "%s %s :Removed %s from your DCCALLOW list", u->nick.c_str(), u->nick.c_str(), i->nickname.c_str());
 420                                                         dl->erase(i);
 421                                                         break;
 422                                                 }
 423                                         }
 424                                 }
 425                         }
 426                         else
 427                         {
 428                                 RemoveFromUserlist(u);
 429                         }
 430                 }
 431         }
 432
 433         void RemoveFromUserlist(User *user)
 434         {
 435                 // remove user from userlist
 436                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 437                 {
 438                         User* u = (User*)(*j);
 439                         if (u == user)
 440                         {
 441                                 ul.erase(j);
 442                                 break;
 443                         }
 444                 }
 445         }
 446
 447         void ReadFileConf()
 448         {
 449                 ConfigReader Conf;
 450                 bfl.clear();
 451                 for (int i = 0; i < Conf.Enumerate("banfile"); i++)
 452                 {
 453                         BannedFileList bf;
 454                         std::string fileglob = Conf.ReadValue("banfile", "pattern", i);
 455                         std::string action = Conf.ReadValue("banfile", "action", i);
 456                         bf.filemask = fileglob;
 457                         bf.action = action;
 458                         bfl.push_back(bf);
 459                 }
 460
 461         }
 462
 463         virtual ~ModuleDCCAllow()
 464         {
 465                 delete ext;
 466         }
 467
 468         virtual Version GetVersion()
 469         {
 470                 return Version("Povides support for the /DCCALLOW command", VF_COMMON | VF_VENDOR);
 471         }
 472 };
 473
 474 MODULE_INIT(ModuleDCCAllow)