src/command_parse.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd: (C) 2002-2007 InspIRCd Development Team
   6  * See: http://www.inspircd.org/wiki/index.php/Credits
   7  *
   8  * This program is free but copyrighted software; see
   9  *            the file COPYING for details.
  10  *
  11  * ---------------------------------------------------
  12  */
  13
  14 #include "inspircd.h"
  15 #include "wildcard.h"
  16 #include "xline.h"
  17 #include "socketengine.h"
  18 #include "socket.h"
  19 #include "command_parse.h"
  20 #include "exitcodes.h"
  21
  22 /* Directory Searching for Unix-Only */
  23 #ifndef WIN32
  24 #include <dirent.h>
  25 #include <dlfcn.h>
  26 #endif
  27
  28 bool InspIRCd::ULine(const char* server)
  29 {
  30         if (!server)
  31                 return false;
  32         if (!*server)
  33                 return true;
  34
  35         return (Config->ulines.find(server) != Config->ulines.end());
  36 }
  37
  38 bool InspIRCd::SilentULine(const char* server)
  39 {
  40         std::map<irc::string,bool>::iterator n = Config->ulines.find(server);
  41         if (n != Config->ulines.end())
  42                 return n->second;
  43         else return false;
  44 }
  45
  46 int InspIRCd::OperPassCompare(const char* data,const char* input, int tagnumber)
  47 {
  48         int MOD_RESULT = 0;
  49         FOREACH_RESULT_I(this,I_OnOperCompare,OnOperCompare(data, input, tagnumber))
  50         if (MOD_RESULT == 1)
  51                 return 0;
  52         if (MOD_RESULT == -1)
  53                 return 1;
  54         return strcmp(data,input);
  55 }
  56
  57 std::string InspIRCd::TimeString(time_t curtime)
  58 {
  59         return std::string(ctime(&curtime),24);
  60 }
  61
  62 /** Refactored by Brain, Jun 2007. Much faster with some clever O(1) array
  63  * lookups and pointer maths.
  64  */
  65 long InspIRCd::Duration(const std::string &str)
  66 {
  67         unsigned char multiplier = 0;
  68         long total = 0;
  69         long times = 1;
  70         long subtotal = 0;
  71
  72         /* Iterate each item in the string, looking for number or multiplier */
  73         for (std::string::const_reverse_iterator i = str.rbegin(); i != str.rend(); ++i)
  74         {
  75                 /* Found a number, queue it onto the current number */
  76                 if ((*i >= '0') && (*i <= '9'))
  77                 {
  78                         subtotal = subtotal + ((*i - '0') * times);
  79                         times = times * 10;
  80                 }
  81                 else
  82                 {
  83                         /* Found something thats not a number, find out how much
  84                          * it multiplies the built up number by, multiply the total
  85                          * and reset the built up number.
  86                          */
  87                         if (subtotal)
  88                                 total += subtotal * duration_multi[multiplier];
  89
  90                         /* Next subtotal please */
  91                         subtotal = 0;
  92                         multiplier = *i;
  93                         times = 1;
  94                 }
  95         }
  96         if (multiplier)
  97         {
  98                 total += subtotal * duration_multi[multiplier];
  99                 subtotal = 0;
 100         }
 101         /* Any trailing values built up are treated as raw seconds */
 102         return total + subtotal;
 103 }
 104
 105 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
 106  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
 107  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
 108  * the channel names and their keys as follows:
 109  * JOIN #chan1,#chan2,#chan3 key1,,key3
 110  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
 111  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
 112  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
 113  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
 114  */
 115 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
 116 {
 117         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 118          * which called us just carries on as it was.
 119          */
 120         if (!strchr(parameters[splithere],','))
 121                 return 0;
 122
 123         /** Some lame ircds will weed out dupes using some shitty O(n^2) algorithm.
 124          * By using std::map (thanks for the idea w00t) we can cut this down a ton.
 125          * ...VOOODOOOO!
 126          */
 127         std::map<irc::string, bool> dupes;
 128
 129         /* Create two lists, one for channel names, one for keys
 130          */
 131         irc::commasepstream items1(parameters[splithere]);
 132         irc::commasepstream items2(parameters[extra]);
 133         std::string extrastuff;
 134         std::string item;
 135         unsigned int max = 0;
 136
 137         /* Attempt to iterate these lists and call the command objech
 138          * which called us, for every parameter pair until there are
 139          * no more left to parse.
 140          */
 141         while (items1.GetToken(item) && (max++ < ServerInstance->Config->MaxTargets))
 142         {
 143                 if (dupes.find(item.c_str()) == dupes.end())
 144                 {
 145                         const char* new_parameters[MAXPARAMETERS];
 146
 147                         for (int t = 0; (t < pcnt) && (t < MAXPARAMETERS); t++)
 148                                 new_parameters[t] = parameters[t];
 149
 150                         if (!items2.GetToken(extrastuff))
 151                                 extrastuff = "";
 152
 153                         new_parameters[splithere] = item.c_str();
 154                         new_parameters[extra] = extrastuff.c_str();
 155
 156                         CommandObj->Handle(new_parameters,pcnt,user);
 157
 158                         dupes[item.c_str()] = true;
 159                 }
 160         }
 161         return 1;
 162 }
 163
 164 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 165 {
 166         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 167          * which called us just carries on as it was.
 168          */
 169         if (!strchr(parameters[splithere],','))
 170                 return 0;
 171
 172         std::map<irc::string, bool> dupes;
 173
 174         /* Only one commasepstream here */
 175         irc::commasepstream items1(parameters[splithere]);
 176         std::string item;
 177         unsigned int max = 0;
 178
 179         /* Parse the commasepstream until there are no tokens remaining.
 180          * Each token we parse out, call the command handler that called us
 181          * with it
 182          */
 183         while (items1.GetToken(item) && (max++ < ServerInstance->Config->MaxTargets))
 184         {
 185                 if (dupes.find(item.c_str()) == dupes.end())
 186                 {
 187                         const char* new_parameters[MAXPARAMETERS];
 188
 189                         for (int t = 0; (t < pcnt) && (t < MAXPARAMETERS); t++)
 190                                 new_parameters[t] = parameters[t];
 191
 192                         new_parameters[splithere] = item.c_str();
 193
 194                         parameters[splithere] = item.c_str();
 195
 196                         /* Execute the command handler over and over. If someone pulls our user
 197                          * record out from under us (e.g. if we /kill a comma sep list, and we're
 198                          * in that list ourselves) abort if we're gone.
 199                          */
 200                         CommandObj->Handle(new_parameters,pcnt,user);
 201
 202                         dupes[item.c_str()] = true;
 203                 }
 204         }
 205         /* By returning 1 we tell our caller that nothing is to be done,
 206          * as all the previous calls handled the data. This makes the parent
 207          * return without doing any processing.
 208          */
 209         return 1;
 210 }
 211
 212 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 213 {
 214         command_table::iterator n = cmdlist.find(commandname);
 215
 216         if (n != cmdlist.end())
 217         {
 218                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 219                 {
 220                         if ((!n->second->flags_needed) || (user->IsModeSet(n->second->flags_needed)))
 221                         {
 222                                 if (n->second->flags_needed)
 223                                 {
 224                                         return ((user->HasPermission(commandname)) || (ServerInstance->ULine(user->server)));
 225                                 }
 226                                 return true;
 227                         }
 228                 }
 229         }
 230         return false;
 231 }
 232
 233 command_t* CommandParser::GetHandler(const std::string &commandname)
 234 {
 235         command_table::iterator n = cmdlist.find(commandname);
 236         if (n != cmdlist.end())
 237                 return n->second;
 238
 239         return NULL;
 240 }
 241
 242 // calls a handler function for a command
 243
 244 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 245 {
 246         command_table::iterator n = cmdlist.find(commandname);
 247
 248         if (n != cmdlist.end())
 249         {
 250                 if (pcnt >= n->second->min_params)
 251                 {
 252                         bool bOkay = false;
 253
 254                         if (IS_LOCAL(user) && n->second->flags_needed)
 255                         {
 256                                 /* if user is local, and flags are needed .. */
 257
 258                                 if (user->IsModeSet(n->second->flags_needed))
 259                                 {
 260                                         /* if user has the flags, and now has the permissions, go ahead */
 261                                         if (user->HasPermission(commandname))
 262                                                 bOkay = true;
 263                                 }
 264                         }
 265                         else
 266                         {
 267                                 /* remote or no flags required anyway */
 268                                 bOkay = true;
 269                         }
 270
 271                         if (bOkay)
 272                         {
 273                                 return n->second->Handle(parameters,pcnt,user);
 274                         }
 275                 }
 276         }
 277         return CMD_INVALID;
 278 }
 279
 280 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 281 {
 282         const char *command_p[MAXPARAMETERS];
 283         int items = 0;
 284         irc::tokenstream tokens(cmd);
 285         std::string command;
 286         tokens.GetToken(command);
 287
 288         /* A client sent a nick prefix on their command (ick)
 289          * rhapsody and some braindead bouncers do this --
 290          * the rfc says they shouldnt but also says the ircd should
 291          * discard it if they do.
 292          */
 293         if (*command.c_str() == ':')
 294                 tokens.GetToken(command);
 295
 296         while (tokens.GetToken(para[items]) && (items < MAXPARAMETERS))
 297         {
 298                 command_p[items] = para[items].c_str();
 299                 items++;
 300         }
 301
 302         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 303
 304         int MOD_RESULT = 0;
 305         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 306         if (MOD_RESULT == 1) {
 307                 return;
 308         }
 309
 310         command_table::iterator cm = cmdlist.find(command);
 311
 312         if (cm != cmdlist.end())
 313         {
 314                 if (user)
 315                 {
 316                         /* activity resets the ping pending timer */
 317                         user->nping = ServerInstance->Time() + user->pingmax;
 318                         if (cm->second->flags_needed)
 319                         {
 320                                 if (!user->IsModeSet(cm->second->flags_needed))
 321                                 {
 322                                         user->WriteServ("481 %s :Permission Denied - You do not have the required operator privileges",user->nick);
 323                                         return;
 324                                 }
 325                                 if (!user->HasPermission(command))
 326                                 {
 327                                         user->WriteServ("481 %s :Permission Denied - Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 328                                         return;
 329                                 }
 330                         }
 331                         if ((user->registered == REG_ALL) && (!IS_OPER(user)) && (cm->second->IsDisabled()))
 332                         {
 333                                 /* command is disabled! */
 334                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 335                                 ServerInstance->SNO->WriteToSnoMask('d', "%s denied for %s (%s@%s)",
 336                                                 command.c_str(), user->nick, user->ident, user->host);
 337                                 return;
 338                         }
 339                         if (items < cm->second->min_params)
 340                         {
 341                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 342                                 if ((ServerInstance->Config->SyntaxHints) && (user->registered == REG_ALL) && (cm->second->syntax.length()))
 343                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 344                                 return;
 345                         }
 346                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 347                         {
 348                                 /* ikky /stats counters */
 349                                 cm->second->use_count++;
 350                                 cm->second->total_bytes += cmd.length();
 351
 352                                 int MOD_RESULT = 0;
 353                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 354                                 if (MOD_RESULT == 1)
 355                                         return;
 356
 357                                 /*
 358                                  * WARNING: nothing should come after this, as the user may be on a cull list to
 359                                  * be nuked next loop iteration. be sensible.
 360                                  */
 361                                 CmdResult result = cm->second->Handle(command_p,items,user);
 362
 363                                 FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 364                                 return;
 365                         }
 366                         else
 367                         {
 368                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 369                                 return;
 370                         }
 371                 }
 372         }
 373         else if (user)
 374         {
 375                 ServerInstance->stats->statsUnknown++;
 376                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 377         }
 378 }
 379
 380 bool CommandParser::RemoveCommands(const char* source)
 381 {
 382         command_table::iterator i,safei;
 383         for (i = cmdlist.begin(); i != cmdlist.end(); i++)
 384         {
 385                 safei = i;
 386                 safei++;
 387                 if (safei != cmdlist.end())
 388                 {
 389                         RemoveCommand(safei, source);
 390                 }
 391         }
 392         safei = cmdlist.begin();
 393         if (safei != cmdlist.end())
 394         {
 395                 RemoveCommand(safei, source);
 396         }
 397         return true;
 398 }
 399
 400 void CommandParser::RemoveCommand(command_table::iterator safei, const char* source)
 401 {
 402         command_t* x = safei->second;
 403         if (x->source == std::string(source))
 404         {
 405                 cmdlist.erase(safei);
 406                 delete x;
 407         }
 408 }
 409
 410 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 411 {
 412         std::string::size_type a;
 413
 414         if (!user)
 415                 return;
 416
 417         while ((a = buffer.rfind("\n")) != std::string::npos)
 418                 buffer.erase(a);
 419         while ((a = buffer.rfind("\r")) != std::string::npos)
 420                 buffer.erase(a);
 421
 422         if (buffer.length())
 423         {
 424                 if (!user->muted)
 425                 {
 426                         ServerInstance->Log(DEBUG,"C[%d] -> :%s %s",user->GetFd(), user->nick, buffer.c_str());
 427                         this->ProcessCommand(user,buffer);
 428                 }
 429         }
 430 }
 431
 432 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 433 {
 434         if (so_handle)
 435         {
 436                 if (RFCCommands.find(f->command) == RFCCommands.end())
 437                         RFCCommands[f->command] = so_handle;
 438                 else
 439                 {
 440                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 441                         return false;
 442                 }
 443         }
 444
 445         /* create the command and push it onto the table */
 446         if (cmdlist.find(f->command) == cmdlist.end())
 447         {
 448                 cmdlist[f->command] = f;
 449                 return true;
 450         }
 451         else return false;
 452 }
 453
 454 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 455 {
 456         para.resize(128);
 457 }
 458
 459 bool CommandParser::FindSym(void** v, void* h)
 460 {
 461         *v = dlsym(h, "init_command");
 462         const char* err = dlerror();
 463         if (err && !(*v))
 464         {
 465                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 466                 return false;
 467         }
 468         return true;
 469 }
 470
 471 bool CommandParser::ReloadCommand(const char* cmd, userrec* user)
 472 {
 473         char filename[MAXBUF];
 474         char commandname[MAXBUF];
 475         int y = 0;
 476
 477         for (const char* x = cmd; *x; x++, y++)
 478                 commandname[y] = toupper(*x);
 479
 480         commandname[y] = 0;
 481
 482         SharedObjectList::iterator command = RFCCommands.find(commandname);
 483
 484         if (command != RFCCommands.end())
 485         {
 486                 command_t* cmdptr = cmdlist.find(commandname)->second;
 487                 cmdlist.erase(cmdlist.find(commandname));
 488
 489                 for (char* x = commandname; *x; x++)
 490                         *x = tolower(*x);
 491
 492
 493                 delete cmdptr;
 494                 dlclose(command->second);
 495                 RFCCommands.erase(command);
 496
 497                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 498                 const char* err = this->LoadCommand(filename);
 499                 if (err)
 500                 {
 501                         if (user)
 502                                 user->WriteServ("NOTICE %s :*** Error loading 'cmd_%s.so': %s", user->nick, cmd, err);
 503                         return false;
 504                 }
 505
 506                 return true;
 507         }
 508
 509         return false;
 510 }
 511
 512 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 513 {
 514         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 515         if (ServerInstance->Parser->ReloadCommand(parameters[0], user))
 516         {
 517                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 518                 ServerInstance->WriteOpers("*** RELOAD: %s reloaded the '%s' command.", user->nick, parameters[0]);
 519                 return CMD_SUCCESS;
 520         }
 521         else
 522         {
 523                 user->WriteServ("NOTICE %s :*** Could not reload command '%s' -- fix this problem, then /REHASH as soon as possible!", user->nick, parameters[0]);
 524                 return CMD_FAILURE;
 525         }
 526 }
 527
 528 const char* CommandParser::LoadCommand(const char* name)
 529 {
 530         char filename[MAXBUF];
 531         void* h;
 532         command_t* (*cmd_factory_func)(InspIRCd*);
 533
 534         /* Command already exists? Succeed silently - this is needed for REHASH */
 535         if (RFCCommands.find(name) != RFCCommands.end())
 536         {
 537                 ServerInstance->Log(DEBUG,"Not reloading command %s/%s, it already exists", LIBRARYDIR, name);
 538                 return NULL;
 539         }
 540
 541         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 542         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 543
 544         if (!h)
 545         {
 546                 const char* n = dlerror();
 547                 ServerInstance->Log(SPARSE, "Error loading core command: %s", n);
 548                 return n;
 549         }
 550
 551         if (this->FindSym((void **)&cmd_factory_func, h))
 552         {
 553                 command_t* newcommand = cmd_factory_func(ServerInstance);
 554                 this->CreateCommand(newcommand, h);
 555         }
 556         return NULL;
 557 }
 558
 559 void CommandParser::SetupCommandTable(userrec* user)
 560 {
 561         RFCCommands.clear();
 562
 563         if (!user)
 564         {
 565                 printf("\nLoading core commands");
 566                 fflush(stdout);
 567         }
 568
 569         DIR* library = opendir(LIBRARYDIR);
 570         if (library)
 571         {
 572                 dirent* entry = NULL;
 573                 while ((entry = readdir(library)))
 574                 {
 575                         if (match(entry->d_name, "cmd_*.so"))
 576                         {
 577                                 if (!user)
 578                                 {
 579                                         printf(".");
 580                                         fflush(stdout);
 581                                 }
 582                                 const char* err = this->LoadCommand(entry->d_name);
 583                                 if (err)
 584                                 {
 585                                         if (user)
 586                                         {
 587                                                 user->WriteServ("NOTICE %s :*** Failed to load core command %s: %s", user->nick, entry->d_name, err);
 588                                         }
 589                                         else
 590                                         {
 591                                                 printf("Error loading %s: %s", entry->d_name, err);
 592                                                 exit(EXIT_STATUS_BADHANDLER);
 593                                         }
 594                                 }
 595                         }
 596                 }
 597                 closedir(library);
 598                 if (!user)
 599                         printf("\n");
 600         }
 601
 602         if (cmdlist.find("RELOAD") == cmdlist.end())
 603                 this->CreateCommand(new cmd_reload(ServerInstance));
 604 }
 605
 606 int CommandParser::TranslateUIDs(TranslateType to, const std::string &source, std::string &dest)
 607 {
 608         userrec* user = NULL;
 609         std::string item;
 610         int translations = 0;
 611
 612         switch (to)
 613         {
 614                 case TR_NICK:
 615                         /* Translate single nickname */
 616                         ServerInstance->Log(DEBUG,"TR_NICK");
 617                         user = ServerInstance->FindNick(source);
 618                         if (user)
 619                         {
 620                                 ServerInstance->Log(DEBUG,"Managed UUID");
 621                                 dest = user->uuid;
 622                                 translations++;
 623                         }
 624                         else
 625                         {
 626                                 ServerInstance->Log(DEBUG,"Had to use source.. (%s)", source.c_str());
 627                                 dest = source;
 628                         }
 629                 break;
 630                 case TR_NICKLIST:
 631                 {
 632                         /* Translate comma seperated list of nicknames */
 633                         irc::commasepstream items(source);
 634                         while (items.GetToken(item))
 635                         {
 636                                 user = ServerInstance->FindNick(item);
 637                                 if (user)
 638                                 {
 639                                         dest.append(user->uuid);
 640                                         translations++;
 641                                 }
 642                                 else
 643                                         dest.append(source);
 644                                 dest.append(",");
 645                         }
 646                         if (!dest.empty())
 647                                 dest.erase(dest.end() - 1);
 648                 }
 649                 break;
 650                 case TR_SPACENICKLIST:
 651                 {
 652                         /* Translate space seperated list of nicknames */
 653                         irc::spacesepstream items(source);
 654                         while (items.GetToken(item))
 655                         {
 656                                 user = ServerInstance->FindNick(item);
 657                                 if (user)
 658                                 {
 659                                         dest.append(user->uuid);
 660                                         translations++;
 661                                 }
 662                                 else
 663                                         dest.append(source);
 664                                 dest.append(" ");
 665                         }
 666                         if (!dest.empty())
 667                                 dest.erase(dest.end() - 1);
 668                 }
 669                 break;
 670                 case TR_END:
 671                 case TR_TEXT:
 672                 default:
 673                         /* Do nothing */
 674                         dest = source;
 675                 break;
 676         }
 677
 678         return translations;
 679 }
 680