src/command_parse.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 /* $Core: libIRCDcommand_parse */
  15
  16 #include "inspircd.h"
  17 #include "wildcard.h"
  18 #include "xline.h"
  19 #include "socketengine.h"
  20 #include "socket.h"
  21 #include "command_parse.h"
  22 #include "exitcodes.h"
  23
  24 /* Directory Searching for Unix-Only */
  25 #ifndef WIN32
  26 #include <dirent.h>
  27 #include <dlfcn.h>
  28 #endif
  29
  30 int InspIRCd::PassCompare(Extensible* ex, const char* data,const char* input, const char* hashtype)
  31 {
  32         int MOD_RESULT = 0;
  33         FOREACH_RESULT_I(this,I_OnPassCompare,OnPassCompare(ex, data, input, hashtype))
  34         if (MOD_RESULT == 1)
  35                 return 0;
  36         if (MOD_RESULT == -1)
  37                 return 1;
  38         return strcmp(data,input);
  39 }
  40
  41 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
  42  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
  43  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
  44  * the channel names and their keys as follows:
  45  * JOIN #chan1,#chan2,#chan3 key1,,key3
  46  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
  47  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
  48  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
  49  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
  50  */
  51 int CommandParser::LoopCall(User* user, Command* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
  52 {
  53         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
  54          * which called us just carries on as it was.
  55          */
  56         if (!strchr(parameters[splithere],','))
  57                 return 0;
  58
  59         /** Some lame ircds will weed out dupes using some shitty O(n^2) algorithm.
  60          * By using std::map (thanks for the idea w00t) we can cut this down a ton.
  61          * ...VOOODOOOO!
  62          */
  63         std::map<irc::string, bool> dupes;
  64
  65         /* Create two lists, one for channel names, one for keys
  66          */
  67         irc::commasepstream items1(parameters[splithere]);
  68         irc::commasepstream items2(parameters[extra]);
  69         std::string extrastuff;
  70         std::string item;
  71         unsigned int max = 0;
  72
  73         /* Attempt to iterate these lists and call the command objech
  74          * which called us, for every parameter pair until there are
  75          * no more left to parse.
  76          */
  77         while (items1.GetToken(item) && (max++ < ServerInstance->Config->MaxTargets))
  78         {
  79                 if (dupes.find(item.c_str()) == dupes.end())
  80                 {
  81                         const char* new_parameters[MAXPARAMETERS];
  82
  83                         for (int t = 0; (t < pcnt) && (t < MAXPARAMETERS); t++)
  84                                 new_parameters[t] = parameters[t];
  85
  86                         if (!items2.GetToken(extrastuff))
  87                                 extrastuff = "";
  88
  89                         new_parameters[splithere] = item.c_str();
  90                         new_parameters[extra] = extrastuff.c_str();
  91
  92                         CommandObj->Handle(new_parameters,pcnt,user);
  93
  94                         dupes[item.c_str()] = true;
  95                 }
  96         }
  97         return 1;
  98 }
  99
 100 int CommandParser::LoopCall(User* user, Command* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 101 {
 102         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 103          * which called us just carries on as it was.
 104          */
 105         if (!strchr(parameters[splithere],','))
 106                 return 0;
 107
 108         std::map<irc::string, bool> dupes;
 109
 110         /* Only one commasepstream here */
 111         irc::commasepstream items1(parameters[splithere]);
 112         std::string item;
 113         unsigned int max = 0;
 114
 115         /* Parse the commasepstream until there are no tokens remaining.
 116          * Each token we parse out, call the command handler that called us
 117          * with it
 118          */
 119         while (items1.GetToken(item) && (max++ < ServerInstance->Config->MaxTargets))
 120         {
 121                 if (dupes.find(item.c_str()) == dupes.end())
 122                 {
 123                         const char* new_parameters[MAXPARAMETERS];
 124
 125                         for (int t = 0; (t < pcnt) && (t < MAXPARAMETERS); t++)
 126                                 new_parameters[t] = parameters[t];
 127
 128                         new_parameters[splithere] = item.c_str();
 129
 130                         /* Execute the command handler over and over. If someone pulls our user
 131                          * record out from under us (e.g. if we /kill a comma sep list, and we're
 132                          * in that list ourselves) abort if we're gone.
 133                          */
 134                         CommandObj->Handle(new_parameters,pcnt,user);
 135
 136                         dupes[item.c_str()] = true;
 137                 }
 138         }
 139         /* By returning 1 we tell our caller that nothing is to be done,
 140          * as all the previous calls handled the data. This makes the parent
 141          * return without doing any processing.
 142          */
 143         return 1;
 144 }
 145
 146 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, User * user)
 147 {
 148         Commandable::iterator n = cmdlist.find(commandname);
 149
 150         if (n != cmdlist.end())
 151         {
 152                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 153                 {
 154                         if (IS_LOCAL(user) && n->second->flags_needed)
 155                         {
 156                                 if (user->IsModeSet(n->second->flags_needed))
 157                                 {
 158                                         return (user->HasPermission(commandname));
 159                                 }
 160                         }
 161                         else
 162                         {
 163                                 return true;
 164                         }
 165                 }
 166         }
 167         return false;
 168 }
 169
 170 Command* CommandParser::GetHandler(const std::string &commandname)
 171 {
 172         Commandable::iterator n = cmdlist.find(commandname);
 173         if (n != cmdlist.end())
 174                 return n->second;
 175
 176         return NULL;
 177 }
 178
 179 // calls a handler function for a command
 180
 181 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, User *user)
 182 {
 183         Commandable::iterator n = cmdlist.find(commandname);
 184
 185         if (n != cmdlist.end())
 186         {
 187                 if (pcnt >= n->second->min_params)
 188                 {
 189                         bool bOkay = false;
 190
 191                         if (IS_LOCAL(user) && n->second->flags_needed)
 192                         {
 193                                 /* if user is local, and flags are needed .. */
 194
 195                                 if (user->IsModeSet(n->second->flags_needed))
 196                                 {
 197                                         /* if user has the flags, and now has the permissions, go ahead */
 198                                         if (user->HasPermission(commandname))
 199                                                 bOkay = true;
 200                                 }
 201                         }
 202                         else
 203                         {
 204                                 /* remote or no flags required anyway */
 205                                 bOkay = true;
 206                         }
 207
 208                         if (bOkay)
 209                         {
 210                                 return n->second->Handle(parameters,pcnt,user);
 211                         }
 212                 }
 213         }
 214         return CMD_INVALID;
 215 }
 216
 217 void CommandParser::DoLines(User* current, bool one_only)
 218 {
 219         // while there are complete lines to process...
 220         unsigned int floodlines = 0;
 221
 222         while (current->BufferIsReady())
 223         {
 224                 if (current->MyClass)
 225                 {
 226                         if (ServerInstance->Time() > current->reset_due)
 227                         {
 228                                 current->reset_due = ServerInstance->Time() + current->MyClass->GetThreshold();
 229                                 current->lines_in = 0;
 230                         }
 231
 232                         if (++current->lines_in > current->MyClass->GetFlood() && current->MyClass->GetFlood())
 233                         {
 234                                 ServerInstance->FloodQuitUser(current);
 235                                 return;
 236                         }
 237
 238                         if ((++floodlines > current->MyClass->GetFlood()) && (current->MyClass->GetFlood() != 0))
 239                         {
 240                                 ServerInstance->FloodQuitUser(current);
 241                                 return;
 242                         }
 243                 }
 244
 245                 // use GetBuffer to copy single lines into the sanitized string
 246                 std::string single_line = current->GetBuffer();
 247                 current->bytes_in += single_line.length();
 248                 current->cmds_in++;
 249                 if (single_line.length() > MAXBUF - 2)  // MAXBUF is 514 to allow for neccessary line terminators
 250                         single_line.resize(MAXBUF - 2); // So to trim to 512 here, we use MAXBUF - 2
 251
 252                 // ProcessBuffer returns false if the user has gone over penalty
 253                 if (!ServerInstance->Parser->ProcessBuffer(single_line, current) || one_only)
 254                         break;
 255         }
 256 }
 257
 258 bool CommandParser::ProcessCommand(User *user, std::string &cmd)
 259 {
 260         const char *command_p[MAXPARAMETERS];
 261         int items = 0;
 262         irc::tokenstream tokens(cmd);
 263         std::string command;
 264         tokens.GetToken(command);
 265
 266         /* A client sent a nick prefix on their command (ick)
 267          * rhapsody and some braindead bouncers do this --
 268          * the rfc says they shouldnt but also says the ircd should
 269          * discard it if they do.
 270          */
 271         if (*command.c_str() == ':')
 272                 tokens.GetToken(command);
 273
 274         while (tokens.GetToken(para[items]) && (items < MAXPARAMETERS))
 275         {
 276                 command_p[items] = para[items].c_str();
 277                 items++;
 278         }
 279
 280         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 281
 282         int MOD_RESULT = 0;
 283         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 284         if (MOD_RESULT == 1) {
 285                 return true;
 286         }
 287
 288         /* find the command, check it exists */
 289         Commandable::iterator cm = cmdlist.find(command);
 290
 291         if (cm == cmdlist.end())
 292         {
 293                 if (user->registered == REG_ALL)
 294                 {
 295                         user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 296                 }
 297                 ServerInstance->stats->statsUnknown++;
 298                 return true;
 299         }
 300
 301         /* Modify the user's penalty */
 302         bool do_more = true;
 303         if (!user->ExemptFromPenalty)
 304         {
 305                 user->IncreasePenalty(cm->second->Penalty);
 306                 do_more = (user->Penalty < 10);
 307                 if (!do_more)
 308                         user->OverPenalty = true;
 309         }
 310
 311         /* activity resets the ping pending timer */
 312         if (user->MyClass)
 313                 user->nping = ServerInstance->Time() + user->MyClass->GetPingTime();
 314
 315         if (cm->second->flags_needed)
 316         {
 317                 if (!user->IsModeSet(cm->second->flags_needed))
 318                 {
 319                         user->WriteServ("481 %s :Permission Denied - You do not have the required operator privileges",user->nick);
 320                         return do_more;
 321                 }
 322                 if (!user->HasPermission(command))
 323                 {
 324                         user->WriteServ("481 %s :Permission Denied - Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 325                         return do_more;
 326                 }
 327         }
 328         if ((user->registered == REG_ALL) && (!IS_OPER(user)) && (cm->second->IsDisabled()))
 329         {
 330                 /* command is disabled! */
 331                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 332                 ServerInstance->SNO->WriteToSnoMask('d', "%s denied for %s (%s@%s)",
 333                                 command.c_str(), user->nick, user->ident, user->host);
 334                 return do_more;
 335         }
 336         if (items < cm->second->min_params)
 337         {
 338                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 339                 if ((ServerInstance->Config->SyntaxHints) && (user->registered == REG_ALL) && (cm->second->syntax.length()))
 340                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 341                 return do_more;
 342         }
 343         if ((user->registered != REG_ALL) && (!cm->second->WorksBeforeReg()))
 344         {
 345                 user->WriteServ("451 %s :You have not registered",command.c_str());
 346                 return do_more;
 347         }
 348         else
 349         {
 350                 /* passed all checks.. first, do the (ugly) stats counters. */
 351                 cm->second->use_count++;
 352                 cm->second->total_bytes += cmd.length();
 353
 354                 /* module calls too */
 355                 MOD_RESULT = 0;
 356                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 357                 if (MOD_RESULT == 1)
 358                         return do_more;
 359
 360                 /*
 361                  * WARNING: be careful, the user may be deleted soon
 362                  */
 363                 CmdResult result = cm->second->Handle(command_p,items,user);
 364
 365                 FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 366                 return do_more;
 367         }
 368 }
 369
 370 bool CommandParser::RemoveCommands(const char* source)
 371 {
 372         Commandable::iterator i,safei;
 373         for (i = cmdlist.begin(); i != cmdlist.end(); i++)
 374         {
 375                 safei = i;
 376                 safei++;
 377                 if (safei != cmdlist.end())
 378                 {
 379                         RemoveCommand(safei, source);
 380                 }
 381         }
 382         safei = cmdlist.begin();
 383         if (safei != cmdlist.end())
 384         {
 385                 RemoveCommand(safei, source);
 386         }
 387         return true;
 388 }
 389
 390 void CommandParser::RemoveCommand(Commandable::iterator safei, const char* source)
 391 {
 392         Command* x = safei->second;
 393         if (x->source == std::string(source))
 394         {
 395                 cmdlist.erase(safei);
 396                 delete x;
 397         }
 398 }
 399
 400 bool CommandParser::ProcessBuffer(std::string &buffer,User *user)
 401 {
 402         std::string::size_type a;
 403
 404         if (!user)
 405                 return true;
 406
 407         while ((a = buffer.rfind("\n")) != std::string::npos)
 408                 buffer.erase(a);
 409         while ((a = buffer.rfind("\r")) != std::string::npos)
 410                 buffer.erase(a);
 411
 412         if (buffer.length())
 413         {
 414                 ServerInstance->Logs->Log("USERINPUT", DEBUG,"C[%d] I :%s %s",user->GetFd(), user->nick, buffer.c_str());
 415                 return this->ProcessCommand(user,buffer);
 416         }
 417
 418         return true;
 419 }
 420
 421 bool CommandParser::CreateCommand(Command *f, void* so_handle)
 422 {
 423         if (so_handle)
 424         {
 425                 if (RFCCommands.find(f->command) == RFCCommands.end())
 426                         RFCCommands[f->command] = so_handle;
 427                 else
 428                 {
 429                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 430                         return false;
 431                 }
 432         }
 433
 434         /* create the command and push it onto the table */
 435         if (cmdlist.find(f->command) == cmdlist.end())
 436         {
 437                 cmdlist[f->command] = f;
 438                 return true;
 439         }
 440         else return false;
 441 }
 442
 443 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 444 {
 445         para.resize(128);
 446 }
 447
 448 bool CommandParser::FindSym(void** v, void* h, const std::string &name)
 449 {
 450         *v = dlsym(h, "init_command");
 451         const char* err = dlerror();
 452         if (err && !(*v))
 453         {
 454                 ServerInstance->Log(SPARSE, "Error loading core command %s: %s\n", name.c_str(), err);
 455                 return false;
 456         }
 457         return true;
 458 }
 459
 460 bool CommandParser::ReloadCommand(const char* cmd, User* user)
 461 {
 462         char filename[MAXBUF];
 463         char commandname[MAXBUF];
 464         int y = 0;
 465
 466         for (const char* x = cmd; *x; x++, y++)
 467                 commandname[y] = toupper(*x);
 468
 469         commandname[y] = 0;
 470
 471         SharedObjectList::iterator command = RFCCommands.find(commandname);
 472
 473         if (command != RFCCommands.end())
 474         {
 475                 Command* cmdptr = cmdlist.find(commandname)->second;
 476                 cmdlist.erase(cmdlist.find(commandname));
 477
 478                 for (char* x = commandname; *x; x++)
 479                         *x = tolower(*x);
 480
 481
 482                 delete cmdptr;
 483                 dlclose(command->second);
 484                 RFCCommands.erase(command);
 485
 486                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 487                 const char* err = this->LoadCommand(filename);
 488                 if (err)
 489                 {
 490                         if (user)
 491                                 user->WriteServ("NOTICE %s :*** Error loading 'cmd_%s.so': %s", user->nick, cmd, err);
 492                         return false;
 493                 }
 494
 495                 return true;
 496         }
 497
 498         return false;
 499 }
 500
 501 CmdResult cmd_reload::Handle(const char** parameters, int /* pcnt */, User *user)
 502 {
 503         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 504         if (ServerInstance->Parser->ReloadCommand(parameters[0], user))
 505         {
 506                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 507                 ServerInstance->SNO->WriteToSnoMask('A', "RELOAD: %s reloaded the '%s' command.", user->nick, parameters[0]);
 508                 return CMD_SUCCESS;
 509         }
 510         else
 511         {
 512                 user->WriteServ("NOTICE %s :*** Could not reload command '%s' -- fix this problem, then /REHASH as soon as possible!", user->nick, parameters[0]);
 513                 return CMD_FAILURE;
 514         }
 515 }
 516
 517 const char* CommandParser::LoadCommand(const char* name)
 518 {
 519         char filename[MAXBUF];
 520         void* h;
 521         Command* (*cmd_factory_func)(InspIRCd*);
 522
 523         /* Command already exists? Succeed silently - this is needed for REHASH */
 524         if (RFCCommands.find(name) != RFCCommands.end())
 525         {
 526                 ServerInstance->Log(DEBUG,"Not reloading command %s/%s, it already exists", LIBRARYDIR, name);
 527                 return NULL;
 528         }
 529
 530         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 531         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 532
 533         if (!h)
 534         {
 535                 const char* n = dlerror();
 536                 ServerInstance->Log(SPARSE, "Error loading core command %s: %s", name, n);
 537                 return n;
 538         }
 539
 540         if (this->FindSym((void **)&cmd_factory_func, h, name))
 541         {
 542                 Command* newcommand = cmd_factory_func(ServerInstance);
 543                 this->CreateCommand(newcommand, h);
 544         }
 545         return NULL;
 546 }
 547
 548 void CommandParser::SetupCommandTable(User* user)
 549 {
 550         RFCCommands.clear();
 551
 552         if (!user)
 553         {
 554                 printf("\nLoading core commands");
 555                 fflush(stdout);
 556         }
 557
 558         DIR* library = opendir(LIBRARYDIR);
 559         if (library)
 560         {
 561                 dirent* entry = NULL;
 562                 while ((entry = readdir(library)))
 563                 {
 564                         if (match(entry->d_name, "cmd_*.so"))
 565                         {
 566                                 if (!user)
 567                                 {
 568                                         printf(".");
 569                                         fflush(stdout);
 570                                 }
 571                                 const char* err = this->LoadCommand(entry->d_name);
 572                                 if (err)
 573                                 {
 574                                         if (user)
 575                                         {
 576                                                 user->WriteServ("NOTICE %s :*** Failed to load core command %s: %s", user->nick, entry->d_name, err);
 577                                         }
 578                                         else
 579                                         {
 580                                                 printf("Error loading %s: %s", entry->d_name, err);
 581                                                 exit(EXIT_STATUS_BADHANDLER);
 582                                         }
 583                                 }
 584                         }
 585                 }
 586                 closedir(library);
 587                 if (!user)
 588                         printf("\n");
 589         }
 590
 591         if (cmdlist.find("RELOAD") == cmdlist.end())
 592                 this->CreateCommand(new cmd_reload(ServerInstance));
 593 }
 594
 595 int CommandParser::TranslateUIDs(TranslateType to, const std::string &source, std::string &dest)
 596 {
 597         User* user = NULL;
 598         std::string item;
 599         int translations = 0;
 600         dest.clear();
 601
 602         switch (to)
 603         {
 604                 case TR_NICK:
 605                         /* Translate single nickname */
 606                         user = ServerInstance->FindNick(source);
 607                         if (user)
 608                         {
 609                                 dest = user->uuid;
 610                                 translations++;
 611                         }
 612                         else
 613                                 dest = source;
 614                 break;
 615                 case TR_NICKLIST:
 616                 {
 617                         /* Translate comma seperated list of nicknames */
 618                         irc::commasepstream items(source);
 619                         while (items.GetToken(item))
 620                         {
 621                                 user = ServerInstance->FindNick(item);
 622                                 if (user)
 623                                 {
 624                                         dest.append(user->uuid);
 625                                         translations++;
 626                                 }
 627                                 else
 628                                         dest.append(item);
 629                                 dest.append(",");
 630                         }
 631                         if (!dest.empty())
 632                                 dest.erase(dest.end() - 1);
 633                 }
 634                 break;
 635                 case TR_SPACENICKLIST:
 636                 {
 637                         /* Translate space seperated list of nicknames */
 638                         irc::spacesepstream items(source);
 639                         while (items.GetToken(item))
 640                         {
 641                                 user = ServerInstance->FindNick(item);
 642                                 if (user)
 643                                 {
 644                                         dest.append(user->uuid);
 645                                         translations++;
 646                                 }
 647                                 else
 648                                         dest.append(item);
 649                                 dest.append(" ");
 650                         }
 651                         if (!dest.empty())
 652                                 dest.erase(dest.end() - 1);
 653                 }
 654                 break;
 655                 case TR_END:
 656                 case TR_TEXT:
 657                 default:
 658                         /* Do nothing */
 659                         dest = source;
 660                 break;
 661         }
 662
 663         return translations;
 664 }
 665