src/command_parse.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
   6  * See: http://wiki.inspircd.org/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *          the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "xline.h"
  16 #include "socketengine.h"
  17 #include "socket.h"
  18 #include "command_parse.h"
  19 #include "exitcodes.h"
  20
  21 /* Directory Searching for Unix-Only */
  22 #ifndef WIN32
  23 #include <dirent.h>
  24 #include <dlfcn.h>
  25 #endif
  26
  27 int InspIRCd::PassCompare(Extensible* ex, const std::string &data, const std::string &input, const std::string &hashtype)
  28 {
  29         ModResult res;
  30         FIRST_MOD_RESULT(OnPassCompare, res, (ex, data, input, hashtype));
  31
  32         /* Module matched */
  33         if (res == MOD_RES_ALLOW)
  34                 return 0;
  35
  36         /* Module explicitly didnt match */
  37         if (res == MOD_RES_DENY)
  38                 return 1;
  39
  40         /* We dont handle any hash types except for plaintext - Thanks tra26 */
  41         if (hashtype != "" && hashtype != "plaintext")
  42                 /* See below. 1 because they dont match */
  43                 return 1;
  44
  45         return (data != input); // this seems back to front, but returns 0 if they *match*, 1 else
  46 }
  47
  48 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
  49  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
  50  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
  51  * the channel names and their keys as follows:
  52  * JOIN #chan1,#chan2,#chan3 key1,,key3
  53  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
  54  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
  55  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
  56  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
  57  */
  58 int CommandParser::LoopCall(User* user, Command* CommandObj, const std::vector<std::string>& parameters, unsigned int splithere, unsigned int extra)
  59 {
  60         if (splithere >= parameters.size())
  61                 return 0;
  62
  63         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
  64          * which called us just carries on as it was.
  65          */
  66         if (parameters[splithere].find(',') == std::string::npos)
  67                 return 0;
  68
  69         /** Some lame ircds will weed out dupes using some shitty O(n^2) algorithm.
  70          * By using std::set (thanks for the idea w00t) we can cut this down a ton.
  71          * ...VOOODOOOO!
  72          */
  73         std::set<irc::string> dupes;
  74
  75         /* Create two lists, one for channel names, one for keys
  76          */
  77         irc::commasepstream items1(parameters[splithere]);
  78         irc::commasepstream items2(parameters[extra]);
  79         std::string extrastuff;
  80         std::string item;
  81         unsigned int max = 0;
  82
  83         /* Attempt to iterate these lists and call the command objech
  84          * which called us, for every parameter pair until there are
  85          * no more left to parse.
  86          */
  87         while (items1.GetToken(item) && (max++ < ServerInstance->Config->MaxTargets))
  88         {
  89                 if (dupes.find(item.c_str()) == dupes.end())
  90                 {
  91                         std::vector<std::string> new_parameters;
  92
  93                         for (unsigned int t = 0; (t < parameters.size()) && (t < MAXPARAMETERS); t++)
  94                                 new_parameters.push_back(parameters[t]);
  95
  96                         if (!items2.GetToken(extrastuff))
  97                                 extrastuff = "";
  98
  99                         new_parameters[splithere] = item.c_str();
 100                         new_parameters[extra] = extrastuff.c_str();
 101
 102                         CommandObj->Handle(new_parameters, user);
 103
 104                         dupes.insert(item.c_str());
 105                 }
 106         }
 107         return 1;
 108 }
 109
 110 int CommandParser::LoopCall(User* user, Command* CommandObj, const std::vector<std::string>& parameters, unsigned int splithere)
 111 {
 112         if (splithere >= parameters.size())
 113                 return 0;
 114
 115         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 116          * which called us just carries on as it was.
 117          */
 118         if (parameters[splithere].find(',') == std::string::npos)
 119                 return 0;
 120
 121         std::set<irc::string> dupes;
 122
 123         /* Only one commasepstream here */
 124         irc::commasepstream items1(parameters[splithere]);
 125         std::string item;
 126         unsigned int max = 0;
 127
 128         /* Parse the commasepstream until there are no tokens remaining.
 129          * Each token we parse out, call the command handler that called us
 130          * with it
 131          */
 132         while (items1.GetToken(item) && (max++ < ServerInstance->Config->MaxTargets))
 133         {
 134                 if (dupes.find(item.c_str()) == dupes.end())
 135                 {
 136                         std::vector<std::string> new_parameters;
 137
 138                         for (unsigned int t = 0; (t < parameters.size()) && (t < MAXPARAMETERS); t++)
 139                                 new_parameters.push_back(parameters[t]);
 140
 141                         new_parameters[splithere] = item.c_str();
 142
 143                         /* Execute the command handler. */
 144                         CommandObj->Handle(new_parameters, user);
 145
 146                         dupes.insert(item.c_str());
 147                 }
 148         }
 149         /* By returning 1 we tell our caller that nothing is to be done,
 150          * as all the previous calls handled the data. This makes the parent
 151          * return without doing any processing.
 152          */
 153         return 1;
 154 }
 155
 156 bool CommandParser::IsValidCommand(const std::string &commandname, unsigned int pcnt, User * user)
 157 {
 158         Commandtable::iterator n = cmdlist.find(commandname);
 159
 160         if (n != cmdlist.end())
 161         {
 162                 if ((pcnt >= n->second->min_params))
 163                 {
 164                         if (IS_LOCAL(user) && n->second->flags_needed)
 165                         {
 166                                 if (user->IsModeSet(n->second->flags_needed))
 167                                 {
 168                                         return (user->HasPermission(commandname));
 169                                 }
 170                         }
 171                         else
 172                         {
 173                                 return true;
 174                         }
 175                 }
 176         }
 177         return false;
 178 }
 179
 180 Command* CommandParser::GetHandler(const std::string &commandname)
 181 {
 182         Commandtable::iterator n = cmdlist.find(commandname);
 183         if (n != cmdlist.end())
 184                 return n->second;
 185
 186         return NULL;
 187 }
 188
 189 // calls a handler function for a command
 190
 191 CmdResult CommandParser::CallHandler(const std::string &commandname, const std::vector<std::string>& parameters, User *user)
 192 {
 193         Commandtable::iterator n = cmdlist.find(commandname);
 194
 195         if (n != cmdlist.end())
 196         {
 197                 if (parameters.size() >= n->second->min_params)
 198                 {
 199                         bool bOkay = false;
 200
 201                         if (IS_LOCAL(user) && n->second->flags_needed)
 202                         {
 203                                 /* if user is local, and flags are needed .. */
 204
 205                                 if (user->IsModeSet(n->second->flags_needed))
 206                                 {
 207                                         /* if user has the flags, and now has the permissions, go ahead */
 208                                         if (user->HasPermission(commandname))
 209                                                 bOkay = true;
 210                                 }
 211                         }
 212                         else
 213                         {
 214                                 /* remote or no flags required anyway */
 215                                 bOkay = true;
 216                         }
 217
 218                         if (bOkay)
 219                         {
 220                                 return n->second->Handle(parameters,user);
 221                         }
 222                 }
 223         }
 224         return CMD_INVALID;
 225 }
 226
 227 bool CommandParser::ProcessCommand(User *user, std::string &cmd)
 228 {
 229         std::vector<std::string> command_p;
 230         irc::tokenstream tokens(cmd);
 231         std::string command, token;
 232         tokens.GetToken(command);
 233
 234         /* A client sent a nick prefix on their command (ick)
 235          * rhapsody and some braindead bouncers do this --
 236          * the rfc says they shouldnt but also says the ircd should
 237          * discard it if they do.
 238          */
 239         if (command[0] == ':')
 240                 tokens.GetToken(command);
 241
 242         while (tokens.GetToken(token) && (command_p.size() <= MAXPARAMETERS))
 243                 command_p.push_back(token);
 244
 245         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 246
 247         /* find the command, check it exists */
 248         Commandtable::iterator cm = cmdlist.find(command);
 249
 250         /* Modify the user's penalty regardless of whether or not the command exists */
 251         bool do_more = true;
 252         if (IS_LOCAL(user) && !user->HasPrivPermission("users/flood/no-throttle"))
 253         {
 254                 // If it *doesn't* exist, give it a slightly heftier penalty than normal to deter flooding us crap
 255                 IS_LOCAL(user)->Penalty += cm != cmdlist.end() ? cm->second->Penalty : 2;
 256         }
 257
 258
 259         if (cm == cmdlist.end())
 260         {
 261                 ModResult MOD_RESULT;
 262                 FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, command_p, user, false, cmd));
 263                 if (MOD_RESULT == MOD_RES_DENY)
 264                         return true;
 265
 266                 /*
 267                  * This double lookup is in case a module (abbreviation) wishes to change a command.
 268                  * Sure, the double lookup is a bit painful, but bear in mind this only happens for unknowns anyway.
 269                  *
 270                  * Thanks dz for making me actually understand why this is necessary!
 271                  * -- w00t
 272                  */
 273                 cm = cmdlist.find(command);
 274                 if (cm == cmdlist.end())
 275                 {
 276                         if (user->registered == REG_ALL)
 277                                 user->WriteNumeric(ERR_UNKNOWNCOMMAND, "%s %s :Unknown command",user->nick.c_str(),command.c_str());
 278                         ServerInstance->stats->statsUnknown++;
 279                         return true;
 280                 }
 281         }
 282
 283         if (cm->second->max_params && command_p.size() > cm->second->max_params)
 284         {
 285                 /*
 286                  * command_p input (assuming max_params 1):
 287                  *      this
 288                  *      is
 289                  *      a
 290                  *      test
 291                  */
 292                 std::string lparam = "";
 293
 294                 /*
 295                  * The '-1' here is a clever trick, we'll go backwards throwing everything into a temporary param
 296                  * and then just toss that into the array.
 297                  * -- w00t
 298                  */
 299                 while (command_p.size() > (cm->second->max_params - 1))
 300                 {
 301                         // BE CAREFUL: .end() returns past the end of the vector, hence decrement.
 302                         std::vector<std::string>::iterator it = --command_p.end();
 303
 304                         lparam.insert(0, " " + *(it));
 305                         command_p.erase(it); // remove last element
 306                 }
 307
 308                 /* we now have (each iteration):
 309                  *      ' test'
 310                  *      ' a test'
 311                  *      ' is a test' <-- final string
 312                  * ...now remove the ' ' at the start...
 313                  */
 314                 lparam.erase(lparam.begin());
 315
 316                 /* param is now 'is a test', which is exactly what we wanted! */
 317                 command_p.push_back(lparam);
 318         }
 319
 320         /*
 321          * We call OnPreCommand here seperately if the command exists, so the magic above can
 322          * truncate to max_params if necessary. -- w00t
 323          */
 324         ModResult MOD_RESULT;
 325         FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, command_p, user, false, cmd));
 326         if (MOD_RESULT == MOD_RES_DENY)
 327                 return true;
 328
 329         /* activity resets the ping pending timer */
 330         LocalUser* luser = IS_LOCAL(user);
 331         if (luser)
 332                 luser->nping = ServerInstance->Time() + luser->MyClass->GetPingTime();
 333
 334         if (cm->second->flags_needed)
 335         {
 336                 if (!user->IsModeSet(cm->second->flags_needed))
 337                 {
 338                         user->WriteNumeric(ERR_NOPRIVILEGES, "%s :Permission Denied - You do not have the required operator privileges",user->nick.c_str());
 339                         return do_more;
 340                 }
 341                 if (!user->HasPermission(command))
 342                 {
 343                         user->WriteNumeric(ERR_NOPRIVILEGES, "%s :Permission Denied - Oper type %s does not have access to command %s",user->nick.c_str(),irc::Spacify(user->oper.c_str()),command.c_str());
 344                         return do_more;
 345                 }
 346         }
 347         if ((user->registered == REG_ALL) && (!IS_OPER(user)) && (cm->second->IsDisabled()))
 348         {
 349                 /* command is disabled! */
 350                 if (ServerInstance->Config->DisabledDontExist)
 351                 {
 352                         user->WriteNumeric(ERR_UNKNOWNCOMMAND, "%s %s :Unknown command",user->nick.c_str(),command.c_str());
 353                 }
 354                 else
 355                 {
 356                         user->WriteNumeric(ERR_UNKNOWNCOMMAND, "%s %s :This command has been disabled.",
 357                                                                                 user->nick.c_str(), command.c_str());
 358                 }
 359
 360                 ServerInstance->SNO->WriteToSnoMask('t', "%s denied for %s (%s@%s)",
 361                                 command.c_str(), user->nick.c_str(), user->ident.c_str(), user->host.c_str());
 362                 return do_more;
 363         }
 364         if (command_p.size() < cm->second->min_params)
 365         {
 366                 user->WriteNumeric(ERR_NEEDMOREPARAMS, "%s %s :Not enough parameters.", user->nick.c_str(), command.c_str());
 367                 if ((ServerInstance->Config->SyntaxHints) && (user->registered == REG_ALL) && (cm->second->syntax.length()))
 368                         user->WriteNumeric(RPL_SYNTAX, "%s :SYNTAX %s %s", user->nick.c_str(), cm->second->command.c_str(), cm->second->syntax.c_str());
 369                 return do_more;
 370         }
 371         if ((user->registered != REG_ALL) && (!cm->second->WorksBeforeReg()))
 372         {
 373                 user->WriteNumeric(ERR_NOTREGISTERED, "%s :You have not registered",command.c_str());
 374                 return do_more;
 375         }
 376         else
 377         {
 378                 /* passed all checks.. first, do the (ugly) stats counters. */
 379                 cm->second->use_count++;
 380                 cm->second->total_bytes += cmd.length();
 381
 382                 /* module calls too */
 383                 FIRST_MOD_RESULT(OnPreCommand, MOD_RESULT, (command, command_p, user, true, cmd));
 384                 if (MOD_RESULT == MOD_RES_DENY)
 385                         return do_more;
 386
 387                 /*
 388                  * WARNING: be careful, the user may be deleted soon
 389                  */
 390                 CmdResult result = cm->second->Handle(command_p, user);
 391
 392                 FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, user, result,cmd));
 393                 return do_more;
 394         }
 395 }
 396
 397 void CommandParser::RemoveCommand(Command* x)
 398 {
 399         Commandtable::iterator n = cmdlist.find(x->command);
 400         if (n != cmdlist.end() && n->second == x)
 401                 cmdlist.erase(n);
 402 }
 403
 404 Command::~Command()
 405 {
 406         ServerInstance->Parser->RemoveCommand(this);
 407 }
 408
 409 bool CommandParser::ProcessBuffer(std::string &buffer,User *user)
 410 {
 411         if (!user || buffer.empty())
 412                 return true;
 413
 414         ServerInstance->Logs->Log("USERINPUT", DEBUG, "C[%d] I :%s %s",
 415                 user->GetFd(), user->nick.c_str(), buffer.c_str());
 416         return ProcessCommand(user,buffer);
 417 }
 418
 419 bool CommandParser::AddCommand(Command *f)
 420 {
 421         /* create the command and push it onto the table */
 422         if (cmdlist.find(f->command) == cmdlist.end())
 423         {
 424                 cmdlist[f->command] = f;
 425                 return true;
 426         }
 427         return false;
 428 }
 429
 430 CommandParser::CommandParser()
 431 {
 432         para.resize(128);
 433 }
 434
 435 int CommandParser::TranslateUIDs(const std::vector<TranslateType> to, const std::vector<std::string> &source, std::string &dest, bool prefix_final, Command* custom_translator)
 436 {
 437         std::vector<TranslateType>::const_iterator types = to.begin();
 438         User* user = NULL;
 439         unsigned int i;
 440         int translations = 0;
 441         dest.clear();
 442
 443         for(i=0; i < source.size(); i++)
 444         {
 445                 TranslateType t;
 446                 std::string item = source[i];
 447
 448                 if (types == to.end())
 449                         t = TR_TEXT;
 450                 else
 451                 {
 452                         t = *types;
 453                         types++;
 454                 }
 455
 456                 if (prefix_final && i == source.size() - 1)
 457                         dest.append(":");
 458
 459                 switch (t)
 460                 {
 461                         case TR_NICK:
 462                                 /* Translate single nickname */
 463                                 user = ServerInstance->FindNick(item);
 464                                 if (user)
 465                                 {
 466                                         dest.append(user->uuid);
 467                                         translations++;
 468                                 }
 469                                 else
 470                                         dest.append(item);
 471                         break;
 472                         case TR_CUSTOM:
 473                                 if (custom_translator)
 474                                         custom_translator->EncodeParameter(item, i);
 475                                 dest.append(item);
 476                         break;
 477                         case TR_END:
 478                         case TR_TEXT:
 479                         default:
 480                                 /* Do nothing */
 481                                 dest.append(item);
 482                         break;
 483                 }
 484                 if (i != source.size() - 1)
 485                         dest.append(" ");
 486         }
 487
 488         return translations;
 489 }
 490
 491 int CommandParser::TranslateUIDs(TranslateType to, const std::string &source, std::string &dest)
 492 {
 493         User* user = NULL;
 494         std::string item;
 495         int translations = 0;
 496         dest.clear();
 497
 498         switch (to)
 499         {
 500                 case TR_NICK:
 501                         /* Translate single nickname */
 502                         user = ServerInstance->FindNick(source);
 503                         if (user)
 504                         {
 505                                 dest = user->uuid;
 506                                 translations++;
 507                         }
 508                         else
 509                                 dest = source;
 510                 break;
 511                 case TR_END:
 512                 case TR_TEXT:
 513                 default:
 514                         /* Do nothing */
 515                         dest = source;
 516                 break;
 517         }
 518
 519         return translations;
 520 }