src/modules/m_dccallow.cpp

   1  /* m_dccallow - Jamie Penman-Smithson <jamie@silverdream.org> - September 2006 */
   2
   3 using namespace std;
   4
   5 #include <stdio.h>
   6 #include <vector>
   7 #include <string.h>
   8 #include "users.h"
   9 #include "channels.h"
  10 #include "modules.h"
  11 #include "inspircd.h"
  12
  13 /* $ModDesc: Povides support for the /DCCALLOW command */
  14
  15 static ConfigReader *Conf;
  16
  17 class BannedFileList
  18 {
  19  public:
  20         std::string filemask;
  21         std::string action;
  22 };
  23
  24 class DCCAllow
  25 {
  26  public:
  27         std::string nickname;
  28         std::string hostmask;
  29         time_t set_on;
  30         long length;
  31
  32         DCCAllow() { }
  33
  34         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) { }
  35 };
  36
  37 typedef std::vector<userrec *> userlist;
  38 userlist ul;
  39 typedef std::vector<DCCAllow> dccallowlist;
  40 dccallowlist* dl;
  41 typedef std::vector<BannedFileList> bannedfilelist;
  42 bannedfilelist bfl;
  43
  44 class cmd_dccallow : public command_t
  45 {
  46  public:
  47         cmd_dccallow(InspIRCd* Me) : command_t(Me, "DCCALLOW", 0, 0)
  48         {
  49                 this->source = "m_dccallow.so";
  50                 syntax = "{[+|-]<nick> <time>|HELP|LIST}";
  51         }
  52
  53         CmdResult Handle(const char **parameters, int pcnt, userrec *user)
  54         {
  55                 /* syntax: DCCALLOW [+|-]<nick> (<time>) */
  56                 if (!pcnt)
  57                 {
  58                         // display current DCCALLOW list
  59                         DisplayDCCAllowList(user);
  60                         return CMD_FAILURE;
  61                 }
  62                 else if (pcnt > 0)
  63                 {
  64                         char action = *parameters[0];
  65
  66                         // if they didn't specify an action, this is probably a command
  67                         if (action != '+' && action != '-')
  68                         {
  69                                 if (!strcasecmp(parameters[0], "LIST"))
  70                                 {
  71                                         // list current DCCALLOW list
  72                                         DisplayDCCAllowList(user);
  73                                         return CMD_FAILURE;
  74                                 }
  75                                 else if (!strcasecmp(parameters[0], "HELP"))
  76                                 {
  77                                         // display help
  78                                         DisplayHelp(user);
  79                                         return CMD_FAILURE;
  80                                 }
  81                         }
  82
  83                         std::string nick = parameters[0] + 1;
  84                         userrec *target = ServerInstance->FindNick(nick);
  85
  86                         if (target)
  87                         {
  88                                 ServerInstance->Log(DEBUG, "m_dccallow.so: got target %s and action %c", target->nick, action);
  89
  90                                 if (action == '-')
  91                                 {
  92                                         user->GetExt("dccallow_list", dl);
  93                                         // check if it contains any entries
  94                                         if (dl)
  95                                         {
  96                                                 if (dl->size())
  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->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", user->nick, user->nick, target->nick);
 105                                                                         break;
 106                                                                 }
 107                                                         }
 108                                                 }
 109                                         }
 110                                         else
 111                                         {
 112                                                 DELETE(dl);
 113                                                 user->Shrink("dccallow_list");
 114
 115                                                 // remove from userlist
 116                                                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 117                                                 {
 118                                                         userrec* u = (userrec*)(*j);
 119                                                         if (u == user)
 120                                                         {
 121                                                                 ul.erase(j);
 122                                                                 break;
 123                                                         }
 124                                                 }
 125                                         }
 126                                 }
 127                                 else if (action == '+')
 128                                 {
 129                                         // fetch current DCCALLOW list
 130                                         user->GetExt("dccallow_list", dl);
 131                                         // they don't have one, create it
 132                                         if (!dl)
 133                                         {
 134                                                 dl = new dccallowlist;
 135                                                 user->Extend("dccallow_list", dl);
 136                                                 // add this user to the userlist
 137                                                 ul.push_back(user);
 138                                         }
 139                                         for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 140                                         {
 141                                                 if (k->nickname == target->nick)
 142                                                 {
 143                                                         user->WriteServ("996 %s %s :%s is already on your DCCALLOW list", user->nick, user->nick, target->nick);
 144                                                         return CMD_FAILURE;
 145                                                 }
 146                                                 else if (ServerInstance->MatchText(user->GetFullHost(), k->hostmask))
 147                                                 {
 148                                                         user->WriteServ("996 %s %s :You cannot add yourself to your own DCCALLOW list!", user->nick, user->nick);
 149                                                         return CMD_FAILURE;
 150                                                 }
 151                                         }
 152
 153                                         std::string mask = std::string(target->nick)+"!"+std::string(target->ident)+"@"+std::string(target->dhost);
 154                                         std::string default_length = Conf->ReadValue("dccallow", "length", 0);
 155
 156                                         long length;
 157                                         if (pcnt < 2)
 158                                         {
 159                                                 length = ServerInstance->Duration(default_length.c_str());
 160                                         }
 161                                         else if (!atoi(parameters[1]))
 162                                         {
 163                                                 length = 0;
 164                                         }
 165                                         else
 166                                         {
 167                                                 length = ServerInstance->Duration(parameters[1]);
 168                                         }
 169
 170                                         if (!ServerInstance->IsValidMask(mask.c_str()))
 171                                         {
 172                                                 return CMD_FAILURE;
 173                                         }
 174
 175                                         dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 176
 177                                         if (length > 0)
 178                                         {
 179                                                 user->WriteServ("993 %s %s :Added %s to DCCALLOW list for %d seconds", user->nick, user->nick, target->nick, length);
 180                                         }
 181                                         else
 182                                         {
 183                                                 user->WriteServ("994 %s %s :Added %s to DCCALLOW list for this session", user->nick, user->nick, target->nick);
 184                                         }
 185
 186                                         return CMD_SUCCESS;
 187                                 }
 188                         }
 189                         else
 190                         {
 191                                 // nick doesn't exist
 192                                 user->WriteServ("401 %s %s :No such nick/channel", user->nick, nick.c_str());
 193                                 return CMD_FAILURE;
 194                         }
 195                 }
 196                 return CMD_FAILURE;
 197         }
 198
 199         void DisplayHelp(userrec* user)
 200         {
 201                 user->WriteServ("998 %s :DCCALLOW [<+|->nick [time]] [list] [help]", user->nick);
 202                 user->WriteServ("998 %s :You may allow DCCs from specific users by specifying a", user->nick);
 203                 user->WriteServ("998 %s :DCC allow for the user you want to receive DCCs from.", user->nick);
 204                 user->WriteServ("998 %s :For example, to allow the user Brain to send you inspircd.exe", user->nick);
 205                 user->WriteServ("998 %s :you would type:", user->nick);
 206                 user->WriteServ("998 %s :/DCCALLOW +Brain", user->nick);
 207                 user->WriteServ("998 %s :Brain would then be able to send you files. They would have to", user->nick);
 208                 user->WriteServ("998 %s :resend the file again if the server gave them an error message", user->nick);
 209                 user->WriteServ("998 %s :before you added them to your DCCALLOW list.", user->nick);
 210                 user->WriteServ("998 %s :DCCALLOW entries will be temporary by default, if you want to add", user->nick);
 211                 user->WriteServ("998 %s :them to your DCCALLOW list until you leave IRC, type:", user->nick);
 212                 user->WriteServ("998 %s :/DCCALLOW +Brain 0", user->nick);
 213                 user->WriteServ("998 %s :To remove the user from your DCCALLOW list, type:", user->nick);
 214                 user->WriteServ("998 %s :/DCCALLOW -Brain", user->nick);
 215                 user->WriteServ("998 %s :To see the users in your DCCALLOW list, type:", user->nick);
 216                 user->WriteServ("998 %s :/DCCALLOW LIST", user->nick);
 217                 user->WriteServ("998 %s :NOTE: If the user leaves IRC or changes their nickname", user->nick);
 218                 user->WriteServ("998 %s :  they will be removed from your DCCALLOW list.", user->nick);
 219                 user->WriteServ("998 %s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick);
 220                 user->WriteServ("999 %s :End of DCCALLOW HELP", user->nick);
 221         }
 222
 223         void DisplayDCCAllowList(userrec* user)
 224         {
 225                  // display current DCCALLOW list
 226                 user->WriteServ("990 %s :Users on your DCCALLOW list:", user->nick);
 227                 user->GetExt("dccallow_list", dl);
 228
 229                 if (dl)
 230                 {
 231                         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 232                         {
 233                                 user->WriteServ("991 %s %s :%s (%s)", user->nick, user->nick, c->nickname.c_str(), c->hostmask.c_str());
 234                         }
 235                 }
 236
 237                 user->WriteServ("992 %s :End of DCCALLOW list", user->nick);
 238         }
 239
 240 };
 241
 242 class ModuleDCCAllow : public Module
 243 {
 244         cmd_dccallow* mycommand;
 245  public:
 246
 247         ModuleDCCAllow(InspIRCd* Me)
 248                 : Module::Module(Me)
 249         {
 250                 Conf = new ConfigReader(ServerInstance);
 251                 mycommand = new cmd_dccallow(ServerInstance);
 252                 ServerInstance->AddCommand(mycommand);
 253                 ReadFileConf();
 254         }
 255
 256         void Implements(char* List)
 257         {
 258                 List[I_OnUserPreMessage] = List[I_OnUserPreNotice] = List[I_OnUserQuit] = List[I_OnUserPreNick] = List[I_OnRehash] = 1;
 259         }
 260
 261         virtual void OnRehash(const std::string &parameter)
 262         {
 263                 delete Conf;
 264                 Conf = new ConfigReader(ServerInstance);
 265         }
 266
 267         virtual void OnUserQuit(userrec* user, const std::string &reason)
 268         {
 269                 dccallowlist* dl;
 270
 271                 // remove their DCCALLOW list if they have one
 272                 user->GetExt("dccallow_list", dl);
 273                 if (dl)
 274                 {
 275                         DELETE(dl);
 276                         user->Shrink("dccallow_list");
 277                         RemoveFromUserlist(user);
 278                 }
 279
 280                 // remove them from any DCCALLOW lists
 281                 // they are currently on
 282                 RemoveNick(user);
 283         }
 284
 285
 286         virtual int OnUserPreNick(userrec* user, const std::string &newnick)
 287         {
 288                 RemoveNick(user);
 289                 return 0;
 290         }
 291
 292         virtual int OnUserPreMessage(userrec* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 293         {
 294                 return OnUserPreNotice(user, dest, target_type, text, status, exempt_list);
 295         }
 296
 297         virtual int OnUserPreNotice(userrec* user, void* dest, int target_type, std::string &text, char status, CUList &exempt_list)
 298         {
 299                 Expire();
 300
 301                 if (target_type == TYPE_USER)
 302                 {
 303                         userrec* u = (userrec*)dest;
 304
 305                         /* Always allow a user to dcc themselves (although... why?) */
 306                         if (user == u)
 307                                 return 0;
 308
 309                         if ((text.length()) && (text[0] == '\1'))
 310                         {
 311                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 312                                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 313
 314                                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 315                                 {
 316                                         u->GetExt("dccallow_list", dl);
 317
 318                                         if (dl)
 319                                         {
 320                                                 if (dl->size())
 321                                                 {
 322                                                         for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 323                                                         {
 324                                                                 if (ServerInstance->MatchText(user->GetFullHost(), iter->hostmask))
 325                                                                 {
 326                                                                         return 0;
 327                                                                 }
 328                                                         }
 329                                                 }
 330                                         }
 331
 332                                         // tokenize
 333                                         stringstream ss(text);
 334                                         std::string buf;
 335                                         vector<string> tokens;
 336
 337                                         while (ss >> buf)
 338                                                 tokens.push_back(buf);
 339
 340                                         irc::string type = tokens[1].c_str();
 341                                         ServerInstance->Log(DEBUG, "m_dccallow.so: got DCC type %s", type.c_str());
 342
 343                                         bool blockchat = Conf->ReadFlag("dccallow", "blockchat", 0);
 344
 345                                         if (type == "SEND")
 346                                         {
 347                                                 std::string defaultaction = Conf->ReadValue("dccallow", "action", 0);
 348                                                 std::string filename = tokens[2];
 349
 350                                                 if (defaultaction == "allow")
 351                                                 {
 352                                                         return 0;
 353                                                 }
 354
 355                                                 for (unsigned int i = 0; i < bfl.size(); i++)
 356                                                 {
 357                                                         if (ServerInstance->MatchText(filename, bfl[i].filemask))
 358                                                         {
 359                                                                 if (strcmp(bfl[i].action.c_str(), "allow") == 0)
 360                                                                 {
 361                                                                         return 0;
 362                                                                 }
 363                                                         }
 364                                                         else
 365                                                         {
 366                                                                 if (defaultaction == "allow")
 367                                                                 {
 368                                                                         return 0;
 369                                                                 }
 370                                                         }
 371                                                         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());
 372                                                         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());
 373                                                         u->WriteServ("NOTICE %s :If you trust %s and were expecting this, you can type /DCCALLOW HELP for information on the DCCALLOW system.", u->nick, user->nick);
 374                                                 }
 375                                         }
 376                                         else if ((type == "CHAT") && (blockchat))
 377                                         {
 378                                                 user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick, u->nick);
 379                                                 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);
 380                                                 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);
 381                                         }
 382                                         return 1;
 383                                 }
 384                         }
 385                 }
 386                 return 0;
 387         }
 388
 389         void Expire()
 390         {
 391                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 392                 {
 393                         userrec* u = (userrec*)(*iter);
 394                         u->GetExt("dccallow_list", dl);
 395
 396                         if (dl)
 397                         {
 398                                 if (dl->size())
 399                                 {
 400                                         dccallowlist::iterator iter = dl->begin();
 401                                         while (iter != dl->end())
 402                                         {
 403                                                 if ((iter->set_on + iter->length) <= ServerInstance->Time())
 404                                                 {
 405                                                         u->WriteServ("997 %s %s :DCCALLOW entry for %s has expired", u->nick, u->nick, iter->nickname.c_str());
 406                                                         iter = dl->erase(iter);
 407                                                 }
 408                                                 else
 409                                                 {
 410                                                         ++iter;
 411                                                 }
 412                                         }
 413                                 }
 414                         }
 415                         else
 416                         {
 417                                 RemoveFromUserlist(u);
 418                                 ServerInstance->Log(DEBUG, "m_dccallow.so: UH OH! Couldn't get DCCALLOW list for %s", u->nick);
 419                         }
 420                 }
 421         }
 422
 423         void RemoveNick(userrec* user)
 424         {
 425                 /* Iterate through all DCCALLOW lists and remove user */
 426                 for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 427                 {
 428                         userrec *u = (userrec*)(*iter);
 429                         u->GetExt("dccallow_list", dl);
 430
 431                         if (dl)
 432                         {
 433                                 if (dl->size())
 434                                 {
 435                                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 436                                         {
 437                                                 if (i->nickname == user->nick)
 438                                                 {
 439
 440                                                         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());
 441                                                         u->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", u->nick, u->nick, i->nickname.c_str());
 442                                                         dl->erase(i);
 443                                                         break;
 444                                                 }
 445                                         }
 446                                 }
 447                         }
 448                         else
 449                         {
 450                                 RemoveFromUserlist(u);
 451                         }
 452                 }
 453         }
 454
 455         void RemoveFromUserlist(userrec *user)
 456         {
 457                 // remove user from userlist
 458                 for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 459                 {
 460                         userrec* u = (userrec*)(*j);
 461                         if (u == user)
 462                         {
 463                                 ul.erase(j);
 464                                 break;
 465                         }
 466                 }
 467         }
 468
 469         void ReadFileConf()
 470         {
 471                 bfl.clear();
 472                 for (int i = 0; i < Conf->Enumerate("banfile"); i++)
 473                 {
 474                         BannedFileList bf;
 475                         std::string fileglob = Conf->ReadValue("banfile", "pattern", i);
 476                         std::string action = Conf->ReadValue("banfile", "action", i);
 477                         bf.filemask = fileglob;
 478                         bf.action = action;
 479                         bfl.push_back(bf);
 480                 }
 481
 482         }
 483
 484         virtual ~ModuleDCCAllow()
 485         {
 486         }
 487
 488         virtual Version GetVersion()
 489         {
 490                 return Version(1,1,0,0,VF_COMMON,API_VERSION);
 491         }
 492 };
 493
 494 class ModuleDCCAllowFactory : public ModuleFactory
 495 {
 496  public:
 497         ModuleDCCAllowFactory()
 498         {
 499         }
 500
 501         ~ModuleDCCAllowFactory()
 502         {
 503         }
 504
 505         virtual Module * CreateModule(InspIRCd* Me)
 506         {
 507                 return new ModuleDCCAllow(Me);
 508         }
 509
 510 };
 511
 512 extern "C" void * init_module( void )
 513 {
 514         return new ModuleDCCAllowFactory;
 515 }