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(std::string nick, std::string hm, time_t so, 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>}";
  51 }
  52
  53 CmdResult Handle(const char **parameters, int pcnt, userrec *user)
  54 {
  55         /* syntax: DCCALLOW [+|-]<nick> (<time>) */
  56
  57         if (!pcnt)
  58         {
  59         // display current DCCALLOW list
  60         DisplayDCCAllowList(user);
  61
  62         return CMD_SUCCESS;
  63         }
  64         else if (pcnt > 0)
  65         {
  66         char action = *parameters[0];
  67
  68         // if they didn't specify an action, this is probably a command
  69         if (action != '+' && action != '-')
  70         {
  71                 if (!strcasecmp(parameters[0], "LIST"))
  72                 {
  73                 // list current DCCALLOW list
  74                 DisplayDCCAllowList(user);
  75                 return CMD_SUCCESS;
  76                 }
  77                 else if (!strcasecmp(parameters[0], "HELP"))
  78                 {
  79                 // display help
  80                 DisplayHelp(user);
  81                 return CMD_SUCCESS;
  82                 }
  83         }
  84
  85         std::string nick = parameters[0] + 1;
  86         userrec *target = ServerInstance->FindNick(nick);
  87
  88         if (target)
  89         {
  90                 ServerInstance->Log(DEBUG, "m_dccallow.so: got target %s and action %c", target->nick, action);
  91
  92                 if (action == '-')
  93                 {
  94                 user->GetExt("dccallow_list", dl);
  95                 // check if it contains any entries
  96                 if (dl)
  97                 {
  98                         if (dl->size())
  99                         {
 100                         for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 101                         {
 102                                 // search through list
 103                                 if (i->nickname == target->nick)
 104                                 {
 105                                 dl->erase(i);
 106                                 user->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", user->nick, user->nick, target->nick);
 107                                 break;
 108                                 }
 109                         }
 110                         }
 111                 }
 112                 else
 113                 {
 114                         DELETE(dl);
 115                         user->Shrink("dccallow_list");
 116
 117                         // remove from userlist
 118                         for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 119                         {
 120                         userrec* u = (userrec*)(*j);
 121                         if (u->nick == user->nick)
 122                         {
 123                                 ul.erase(j);
 124                                 break;
 125                         }
 126                         }
 127                 }
 128                 }
 129                 else if (action == '+')
 130                 {
 131                 // fetch current DCCALLOW list
 132                 user->GetExt("dccallow_list", dl);
 133                 // they don't have one, create it
 134                 if (!dl)
 135                 {
 136                         dl = new dccallowlist;
 137                         user->Extend(std::string("dccallow_list"), dl);
 138                         // add this user to the userlist
 139                         ul.push_back(user);
 140                 }
 141                 for (dccallowlist::const_iterator k = dl->begin(); k != dl->end(); ++k)
 142                 {
 143                         if (k->nickname == target->nick)
 144                         {
 145                         user->WriteServ("996 %s %s :%s is already on your DCCALLOW list", user->nick, user->nick, target->nick);
 146                         return CMD_SUCCESS;
 147                         }
 148                 }
 149
 150                 std::string mask = std::string(target->nick)+"!"+std::string(target->ident)+"@"+std::string(target->dhost);
 151                 const char* default_length = Conf->ReadValue("dccallow", "length", 0).c_str();
 152
 153                 long length;
 154                 if (pcnt == 1 || ServerInstance->Duration(parameters[1]) < 1)
 155                 {
 156                         length = ServerInstance->Duration(default_length);
 157                 }
 158                 else if (parameters[1] == 0)
 159                 {
 160                         length = 0;
 161                 }
 162                 else
 163                 {
 164                         length = ServerInstance->Duration(parameters[1]);
 165                 }
 166
 167                 if (!ServerInstance->IsValidMask(mask.c_str()))
 168                 {
 169                         return CMD_FAILURE;
 170                 }
 171
 172                 dl->push_back(DCCAllow(target->nick, mask, ServerInstance->Time(), length));
 173
 174                 if (length > 0)
 175                 {
 176                         user->WriteServ("993 %s %s :Added %s to DCCALLOW list for %d seconds", user->nick, user->nick, target->nick, length);
 177                 }
 178                 else
 179                 {
 180                         user->WriteServ("994 %s %s :Added %s to DCCALLOW list for this session", user->nick, user->nick, target->nick);
 181                 }
 182
 183                 return CMD_SUCCESS;
 184                 }
 185         }
 186         else
 187         {
 188                 // nick doesn't exist
 189                 user->WriteServ("401 %s %s :No such nick/channel", user->nick, nick.c_str());
 190                 return CMD_FAILURE;
 191         }
 192         }
 193 return CMD_SUCCESS;
 194 }
 195
 196 void DisplayHelp(userrec* user)
 197 {
 198         user->WriteServ("998 %s :DCCALLOW [<+|->nick [time]] [list] [help]", user->nick);
 199         user->WriteServ("998 %s :You may allow DCCs from specific users by specifying a", user->nick);
 200         user->WriteServ("998 %s :DCC allow for the user you want to receive DCCs from.", user->nick);
 201         user->WriteServ("998 %s :For example, to allow the user Brain to send you inspircd.exe", user->nick);
 202         user->WriteServ("998 %s :you would type:", user->nick);
 203         user->WriteServ("998 %s :/DCCALLOW +Brain", user->nick);
 204         user->WriteServ("998 %s :Brain would then be able to send you files. They would have to", user->nick);
 205         user->WriteServ("998 %s :resend the file again if the server gave them an error message", user->nick);
 206         user->WriteServ("998 %s :before you added them to your DCCALLOW list.", user->nick);
 207         user->WriteServ("998 %s :DCCALLOW entries will be temporary by default, if you want to add", user->nick);
 208         user->WriteServ("998 %s :them to your DCCALLOW list until you leave IRC, type:", user->nick);
 209         user->WriteServ("998 %s :/DCCALLOW +Brain 0", user->nick);
 210         user->WriteServ("998 %s :To remove the user from your DCCALLOW list, type:", user->nick);
 211         user->WriteServ("998 %s :/DCCALLOW -Brain", user->nick);
 212         user->WriteServ("998 %s :To see the users in your DCCALLOW list, type:", user->nick);
 213         user->WriteServ("998 %s :/DCCALLOW LIST", user->nick);
 214         user->WriteServ("998 %s :NOTE: If the user leaves IRC or changes their nickname", user->nick);
 215         user->WriteServ("998 %s :  they will be removed from your DCCALLOW list.", user->nick);
 216         user->WriteServ("998 %s :  your DCCALLOW list will be deleted when you leave IRC.", user->nick);
 217         user->WriteServ("999 %s :End of DCCALLOW HELP", user->nick);
 218 }
 219
 220 void DisplayDCCAllowList(userrec* user)
 221 {
 222          // display current DCCALLOW list
 223         user->WriteServ("990 %s :Users on your DCCALLOW list:", user->nick);
 224         user->GetExt("dccallow_list", dl);
 225
 226         if (dl)
 227         {
 228         for (dccallowlist::const_iterator c = dl->begin(); c != dl->end(); ++c)
 229         {
 230                 user->WriteServ("991 %s %s :%s (%s)", user->nick, user->nick, c->nickname.c_str(), c->hostmask.c_str());
 231         }
 232         }
 233
 234         user->WriteServ("992 %s :End of DCCALLOW list", user->nick);
 235 }
 236
 237 };
 238
 239 class ModuleDCCAllow : public Module
 240 {
 241 cmd_dccallow* mycommand;
 242
 243  public:
 244 ModuleDCCAllow(InspIRCd* Me)
 245         : Module::Module(Me)
 246 {
 247         Conf = new ConfigReader(ServerInstance);
 248         mycommand = new cmd_dccallow(ServerInstance);
 249         ServerInstance->AddCommand(mycommand);
 250         ReadFileConf();
 251 }
 252
 253 void Implements(char* List)
 254 {
 255         List[I_OnUserPreMessage] = List[I_OnUserPreNotice] = List[I_OnUserQuit] = List[I_OnUserPreNick] = List[I_OnRehash] = 1;
 256 }
 257
 258 virtual void OnRehash(const std::string &parameter)
 259 {
 260                 delete Conf;
 261         Conf = new ConfigReader(ServerInstance);
 262 }
 263
 264 virtual void OnUserQuit(userrec* user, const std::string &reason)
 265 {
 266         dccallowlist* dl;
 267
 268         // remove their DCCALLOW list if they have one
 269         user->GetExt("dccallow_list", dl);
 270         if (dl)
 271         {
 272         DELETE(dl);
 273         user->Shrink("dccallow_list");
 274         RemoveFromUserlist(user);
 275         }
 276
 277         // remove them from any DCCALLOW lists
 278         // they are currently on
 279         RemoveNick(user);
 280 }
 281
 282
 283 virtual int OnUserPreNick(userrec* user, const std::string &newnick)
 284 {
 285         RemoveNick(user);
 286         return 0;
 287 }
 288
 289 virtual int OnUserPreMessage(userrec* user, void* dest, int target_type, std::string &text, char status)
 290 {
 291         return OnUserPreNotice(user, dest, target_type, text, status);
 292 }
 293
 294 virtual int OnUserPreNotice(userrec* user, void* dest, int target_type, std::string &text, char status)
 295 {
 296         Expire();
 297
 298         if (target_type == TYPE_USER)
 299         {
 300         userrec* u = (userrec*)dest;
 301
 302         if ((text.length()) && (text[0] == '\1'))
 303         {
 304                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :DCC SEND m_dnsbl.cpp 3232235786 52650 9676
 305                 // :jamie!jamie@test-D4457903BA652E0F.silverdream.org PRIVMSG eimaj :VERSION
 306
 307                 if (strncmp(text.c_str(), "\1DCC ", 5) == 0)
 308                 {
 309                 u->GetExt("dccallow_list", dl);
 310
 311                 if (dl)
 312                 {
 313                         if (dl->size())
 314                         {
 315                         for (dccallowlist::const_iterator iter = dl->begin(); iter != dl->end(); ++iter)
 316                         {
 317                                 if (ServerInstance->MatchText(user->GetFullHost(), iter->hostmask))
 318                                 {
 319                                 return 0;
 320                                 }
 321                         }
 322                         }
 323                 }
 324
 325                 // tokenize
 326                 stringstream ss(text);
 327                 std::string buf;
 328                 vector<string> tokens;
 329
 330                 while (ss >> buf)
 331                         tokens.push_back(buf);
 332
 333                 irc::string type = tokens[1].c_str();
 334                 ServerInstance->Log(DEBUG, "m_dccallow.so: got DCC type %s", type.c_str());
 335
 336                 bool blockchat = Conf->ReadBool("dccallow", "blockchat", 0);
 337
 338                 if (type == "SEND")
 339                 {
 340                         std::string defaultaction = Conf->ReadValue("dccallow", "action", 0);
 341                         std::string filename = tokens[2];
 342
 343                         if (defaultaction == "allow")
 344                         {
 345                         return 0;
 346                         }
 347
 348                         for (unsigned int i = 0; i < bfl.size(); i++)
 349                         {
 350                         if (ServerInstance->MatchText(filename, bfl[i].filemask))
 351                         {
 352                                 if (strcmp(bfl[i].action.c_str(), "allow") == 0)
 353                                 {
 354                                 return 0;
 355                                 }
 356                         }
 357                         else
 358                         {
 359                                 if (defaultaction == "allow")
 360                                 {
 361                                 return 0;
 362                                 }
 363                         }
 364                         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());
 365                         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());
 366                         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);
 367                         }
 368                 }
 369                 else if ((type == "CHAT") && (strcmp(blockchat, "yes") == 0))
 370                 {
 371                         user->WriteServ("NOTICE %s :The user %s is not accepting DCC CHAT requests from you.", user->nick, u->nick);
 372                         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);
 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                 return 1;
 376                 }
 377         }
 378         }
 379         return 0;
 380 }
 381
 382 void Expire()
 383 {
 384         for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 385         {
 386         userrec* u = (userrec*)(*iter);
 387         u->GetExt("dccallow_list", dl);
 388
 389         if (dl)
 390         {
 391                 if (dl->size())
 392                 {
 393                 dccallowlist::iterator iter = dl->begin();
 394                 while (iter != dl->end())
 395                 {
 396                         if ((iter->set_on + iter->length) <= ServerInstance->Time())
 397                         {
 398                         u->WriteServ("997 %s %s :DCCALLOW entry for %s has expired", u->nick, u->nick, iter->nickname.c_str());
 399                         iter = dl->erase(iter);
 400                         }
 401                         else
 402                         {
 403                         ++iter;
 404                         }
 405                 }
 406                 }
 407         }
 408         else
 409         {
 410                 DELETE(dl);
 411                 u->Shrink("dccallow_list");
 412                 RemoveFromUserlist(u);
 413                 ServerInstance->Log(DEBUG, "m_dccallow.so: UH OH! Couldn't get DCCALLOW list for %s", u->nick);
 414         }
 415         }
 416 }
 417
 418 void RemoveNick(userrec* user)
 419 {
 420         /* Iterate through all DCCALLOW lists and remove user */
 421         for (userlist::iterator iter = ul.begin(); iter != ul.end(); ++iter)
 422         {
 423         userrec *u = (userrec*)(*iter);
 424         u->GetExt("dccallow_list", dl);
 425
 426         if (dl)
 427         {
 428                 if (dl->size())
 429                 {
 430                 for (dccallowlist::iterator i = dl->begin(); i != dl->end(); ++i)
 431                 {
 432                         if (i->nickname == user->nick)
 433                         {
 434
 435                         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());
 436                         u->WriteServ("995 %s %s :Removed %s from your DCCALLOW list", u->nick, u->nick, i->nickname.c_str());
 437                         dl->erase(i);
 438                         break;
 439                         }
 440                 }
 441                 }
 442         }
 443         else
 444         {
 445                 DELETE(dl);
 446                 u->Shrink("dccallow_list");
 447                 RemoveFromUserlist(u);
 448         }
 449         }
 450 }
 451
 452 void RemoveFromUserlist(userrec *user)
 453 {
 454         // remove user from userlist
 455         for (userlist::iterator j = ul.begin(); j != ul.end(); ++j)
 456         {
 457         userrec* u = (userrec*)(*j);
 458         if (u->nick == user->nick)
 459         {
 460                 ul.erase(j);
 461                 break;
 462         }
 463         }
 464 }
 465
 466 void ReadFileConf()
 467 {
 468         bfl.clear();
 469         for (int i = 0; i < Conf->Enumerate("banfile"); i++)
 470         {
 471         BannedFileList bf;
 472         std::string fileglob = Conf->ReadValue("banfile", "pattern", i);
 473         std::string action = Conf->ReadValue("banfile", "action", i);
 474         bf.filemask = fileglob;
 475         bf.action = action;
 476         bfl.push_back(bf);
 477         }
 478
 479 }
 480
 481 virtual ~ModuleDCCAllow()
 482 {
 483 }
 484
 485 virtual Version GetVersion()
 486 {
 487         return Version(1,0,0,0,VF_COMMON,API_VERSION);
 488 }
 489 };
 490
 491 class ModuleDCCAllowFactory : public ModuleFactory
 492 {
 493  public:
 494 ModuleDCCAllowFactory()
 495 {
 496 }
 497
 498 ~ModuleDCCAllowFactory()
 499 {
 500 }
 501
 502 virtual Module * CreateModule(InspIRCd* Me)
 503 {
 504         return new ModuleDCCAllow(Me);
 505 }
 506
 507 };
 508
 509 extern "C" void * init_module( void )
 510 {
 511         return new ModuleDCCAllowFactory;
 512 }