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