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 /* $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::OperPassCompare(const char* data,const char* input, int tagnumber)
  31 {
  32         int MOD_RESULT = 0;
  33         FOREACH_RESULT_I(this,I_OnOperCompare,OnOperCompare(data, input, tagnumber))
  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                         parameters[splithere] = item.c_str();
 131
 132                         /* Execute the command handler over and over. If someone pulls our user
 133                          * record out from under us (e.g. if we /kill a comma sep list, and we're
 134                          * in that list ourselves) abort if we're gone.
 135                          */
 136                         CommandObj->Handle(new_parameters,pcnt,user);
 137
 138                         dupes[item.c_str()] = true;
 139                 }
 140         }
 141         /* By returning 1 we tell our caller that nothing is to be done,
 142          * as all the previous calls handled the data. This makes the parent
 143          * return without doing any processing.
 144          */
 145         return 1;
 146 }
 147
 148 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, User * user)
 149 {
 150         Commandable::iterator n = cmdlist.find(commandname);
 151
 152         if (n != cmdlist.end())
 153         {
 154                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 155                 {
 156                         if (IS_LOCAL(user) && n->second->flags_needed)
 157                         {
 158                                 if (user->IsModeSet(n->second->flags_needed))
 159                                 {
 160                                         return (user->HasPermission(commandname));
 161                                 }
 162                         }
 163                         else
 164                         {
 165                                 return true;
 166                         }
 167                 }
 168         }
 169         return false;
 170 }
 171
 172 Command* CommandParser::GetHandler(const std::string &commandname)
 173 {
 174         Commandable::iterator n = cmdlist.find(commandname);
 175         if (n != cmdlist.end())
 176                 return n->second;
 177
 178         return NULL;
 179 }
 180
 181 // calls a handler function for a command
 182
 183 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, User *user)
 184 {
 185         Commandable::iterator n = cmdlist.find(commandname);
 186
 187         if (n != cmdlist.end())
 188         {
 189                 if (pcnt >= n->second->min_params)
 190                 {
 191                         bool bOkay = false;
 192
 193                         if (IS_LOCAL(user) && n->second->flags_needed)
 194                         {
 195                                 /* if user is local, and flags are needed .. */
 196
 197                                 if (user->IsModeSet(n->second->flags_needed))
 198                                 {
 199                                         /* if user has the flags, and now has the permissions, go ahead */
 200                                         if (user->HasPermission(commandname))
 201                                                 bOkay = true;
 202                                 }
 203                         }
 204                         else
 205                         {
 206                                 /* remote or no flags required anyway */
 207                                 bOkay = true;
 208                         }
 209
 210                         if (bOkay)
 211                         {
 212                                 return n->second->Handle(parameters,pcnt,user);
 213                         }
 214                 }
 215         }
 216         return CMD_INVALID;
 217 }
 218
 219 void CommandParser::DoLines(User* current, bool one_only)
 220 {
 221         // while there are complete lines to process...
 222         unsigned int floodlines = 0;
 223
 224         while (current->BufferIsReady())
 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                 // use GetBuffer to copy single lines into the sanitized string
 245                 std::string single_line = current->GetBuffer();
 246                 current->bytes_in += single_line.length();
 247                 current->cmds_in++;
 248                 if (single_line.length() > MAXBUF - 2)  // MAXBUF is 514 to allow for neccessary line terminators
 249                         single_line.resize(MAXBUF - 2); // So to trim to 512 here, we use MAXBUF - 2
 250
 251                 // ProcessBuffer returns false if the user has gone over penalty
 252                 if (!ServerInstance->Parser->ProcessBuffer(single_line, current) || one_only)
 253                         break;
 254         }
 255 }
 256
 257 bool CommandParser::ProcessCommand(User *user, std::string &cmd)
 258 {
 259         const char *command_p[MAXPARAMETERS];
 260         int items = 0;
 261         irc::tokenstream tokens(cmd);
 262         std::string command;
 263         tokens.GetToken(command);
 264
 265         /* A client sent a nick prefix on their command (ick)
 266          * rhapsody and some braindead bouncers do this --
 267          * the rfc says they shouldnt but also says the ircd should
 268          * discard it if they do.
 269          */
 270         if (*command.c_str() == ':')
 271                 tokens.GetToken(command);
 272
 273         while (tokens.GetToken(para[items]) && (items < MAXPARAMETERS))
 274         {
 275                 command_p[items] = para[items].c_str();
 276                 items++;
 277         }
 278
 279         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 280
 281         int MOD_RESULT = 0;
 282         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 283         if (MOD_RESULT == 1) {
 284                 return true;
 285         }
 286
 287         /* find the command, check it exists */
 288         Commandable::iterator cm = cmdlist.find(command);
 289
 290         if (cm == cmdlist.end())
 291         {
 292                 ServerInstance->stats->statsUnknown++;
 293                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 294                 return true;
 295         }
 296
 297         /* Modify the user's penalty */
 298         bool do_more = true;
 299         if (!user->ExemptFromPenalty)
 300         {
 301                 user->IncreasePenalty(cm->second->Penalty);
 302                 do_more = (user->Penalty < 10);
 303                 if (!do_more)
 304                         user->OverPenalty = true;
 305         }
 306
 307         /* activity resets the ping pending timer */
 308         user->nping = ServerInstance->Time() + user->MyClass->GetPingTime();
 309         if (cm->second->flags_needed)
 310         {
 311                 if (!user->IsModeSet(cm->second->flags_needed))
 312                 {
 313                         user->WriteServ("481 %s :Permission Denied - You do not have the required operator privileges",user->nick);
 314                         return do_more;
 315                 }
 316                 if (!user->HasPermission(command))
 317                 {
 318                         user->WriteServ("481 %s :Permission Denied - Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 319                         return do_more;
 320                 }
 321         }
 322         if ((user->registered == REG_ALL) && (!IS_OPER(user)) && (cm->second->IsDisabled()))
 323         {
 324                 /* command is disabled! */
 325                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 326                 ServerInstance->SNO->WriteToSnoMask('d', "%s denied for %s (%s@%s)",
 327                                 command.c_str(), user->nick, user->ident, user->host);
 328                 return do_more;
 329         }
 330         if (items < cm->second->min_params)
 331         {
 332                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 333                 if ((ServerInstance->Config->SyntaxHints) && (user->registered == REG_ALL) && (cm->second->syntax.length()))
 334                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 335                 return do_more;
 336         }
 337         if ((user->registered != REG_ALL) && (!cm->second->WorksBeforeReg()))
 338         {
 339                 user->WriteServ("451 %s :You have not registered",command.c_str());
 340                 return do_more;
 341         }
 342         else
 343         {
 344                 /* passed all checks.. first, do the (ugly) stats counters. */
 345                 cm->second->use_count++;
 346                 cm->second->total_bytes += cmd.length();
 347
 348                 /* module calls too */
 349                 int MOD_RESULT = 0;
 350                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 351                 if (MOD_RESULT == 1)
 352                         return do_more;
 353
 354                 /*
 355                  * WARNING: be careful, the user may be deleted soon
 356                  */
 357                 CmdResult result = cm->second->Handle(command_p,items,user);
 358
 359                 FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 360                 return do_more;
 361         }
 362 }
 363
 364 bool CommandParser::RemoveCommands(const char* source)
 365 {
 366         Commandable::iterator i,safei;
 367         for (i = cmdlist.begin(); i != cmdlist.end(); i++)
 368         {
 369                 safei = i;
 370                 safei++;
 371                 if (safei != cmdlist.end())
 372                 {
 373                         RemoveCommand(safei, source);
 374                 }
 375         }
 376         safei = cmdlist.begin();
 377         if (safei != cmdlist.end())
 378         {
 379                 RemoveCommand(safei, source);
 380         }
 381         return true;
 382 }
 383
 384 void CommandParser::RemoveCommand(Commandable::iterator safei, const char* source)
 385 {
 386         Command* x = safei->second;
 387         if (x->source == std::string(source))
 388         {
 389                 cmdlist.erase(safei);
 390                 delete x;
 391         }
 392 }
 393
 394 bool CommandParser::ProcessBuffer(std::string &buffer,User *user)
 395 {
 396         std::string::size_type a;
 397
 398         if (!user)
 399                 return true;
 400
 401         while ((a = buffer.rfind("\n")) != std::string::npos)
 402                 buffer.erase(a);
 403         while ((a = buffer.rfind("\r")) != std::string::npos)
 404                 buffer.erase(a);
 405
 406         if (buffer.length())
 407         {
 408                 if (!user->muted)
 409                 {
 410                         ServerInstance->Log(DEBUG,"C[%d] I :%s %s",user->GetFd(), user->nick, buffer.c_str());
 411                         return this->ProcessCommand(user,buffer);
 412                 }
 413         }
 414         return true;
 415 }
 416
 417 bool CommandParser::CreateCommand(Command *f, void* so_handle)
 418 {
 419         if (so_handle)
 420         {
 421                 if (RFCCommands.find(f->command) == RFCCommands.end())
 422                         RFCCommands[f->command] = so_handle;
 423                 else
 424                 {
 425                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 426                         return false;
 427                 }
 428         }
 429
 430         /* create the command and push it onto the table */
 431         if (cmdlist.find(f->command) == cmdlist.end())
 432         {
 433                 cmdlist[f->command] = f;
 434                 return true;
 435         }
 436         else return false;
 437 }
 438
 439 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 440 {
 441         para.resize(128);
 442 }
 443
 444 bool CommandParser::FindSym(void** v, void* h, const std::string &name)
 445 {
 446         *v = dlsym(h, "init_command");
 447         const char* err = dlerror();
 448         if (err && !(*v))
 449         {
 450                 ServerInstance->Log(SPARSE, "Error loading core command %s: %s\n", name.c_str(), err);
 451                 return false;
 452         }
 453         return true;
 454 }
 455
 456 bool CommandParser::ReloadCommand(const char* cmd, User* user)
 457 {
 458         char filename[MAXBUF];
 459         char commandname[MAXBUF];
 460         int y = 0;
 461
 462         for (const char* x = cmd; *x; x++, y++)
 463                 commandname[y] = toupper(*x);
 464
 465         commandname[y] = 0;
 466
 467         SharedObjectList::iterator command = RFCCommands.find(commandname);
 468
 469         if (command != RFCCommands.end())
 470         {
 471                 Command* cmdptr = cmdlist.find(commandname)->second;
 472                 cmdlist.erase(cmdlist.find(commandname));
 473
 474                 for (char* x = commandname; *x; x++)
 475                         *x = tolower(*x);
 476
 477
 478                 delete cmdptr;
 479                 dlclose(command->second);
 480                 RFCCommands.erase(command);
 481
 482                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 483                 const char* err = this->LoadCommand(filename);
 484                 if (err)
 485                 {
 486                         if (user)
 487                                 user->WriteServ("NOTICE %s :*** Error loading 'cmd_%s.so': %s", user->nick, cmd, err);
 488                         return false;
 489                 }
 490
 491                 return true;
 492         }
 493
 494         return false;
 495 }
 496
 497 CmdResult cmd_reload::Handle(const char** parameters, int /* pcnt */, User *user)
 498 {
 499         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 500         if (ServerInstance->Parser->ReloadCommand(parameters[0], user))
 501         {
 502                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 503                 ServerInstance->WriteOpers("*** RELOAD: %s reloaded the '%s' command.", user->nick, parameters[0]);
 504                 return CMD_SUCCESS;
 505         }
 506         else
 507         {
 508                 user->WriteServ("NOTICE %s :*** Could not reload command '%s' -- fix this problem, then /REHASH as soon as possible!", user->nick, parameters[0]);
 509                 return CMD_FAILURE;
 510         }
 511 }
 512
 513 const char* CommandParser::LoadCommand(const char* name)
 514 {
 515         char filename[MAXBUF];
 516         void* h;
 517         Command* (*cmd_factory_func)(InspIRCd*);
 518
 519         /* Command already exists? Succeed silently - this is needed for REHASH */
 520         if (RFCCommands.find(name) != RFCCommands.end())
 521         {
 522                 ServerInstance->Log(DEBUG,"Not reloading command %s/%s, it already exists", LIBRARYDIR, name);
 523                 return NULL;
 524         }
 525
 526         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 527         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 528
 529         if (!h)
 530         {
 531                 const char* n = dlerror();
 532                 ServerInstance->Log(SPARSE, "Error loading core command %s: %s", name, n);
 533                 return n;
 534         }
 535
 536         if (this->FindSym((void **)&cmd_factory_func, h, name))
 537         {
 538                 Command* newcommand = cmd_factory_func(ServerInstance);
 539                 this->CreateCommand(newcommand, h);
 540         }
 541         return NULL;
 542 }
 543
 544 void CommandParser::SetupCommandTable(User* user)
 545 {
 546         RFCCommands.clear();
 547
 548         if (!user)
 549         {
 550                 printf("\nLoading core commands");
 551                 fflush(stdout);
 552         }
 553
 554         DIR* library = opendir(LIBRARYDIR);
 555         if (library)
 556         {
 557                 dirent* entry = NULL;
 558                 while ((entry = readdir(library)))
 559                 {
 560                         if (match(entry->d_name, "cmd_*.so"))
 561                         {
 562                                 if (!user)
 563                                 {
 564                                         printf(".");
 565                                         fflush(stdout);
 566                                 }
 567                                 const char* err = this->LoadCommand(entry->d_name);
 568                                 if (err)
 569                                 {
 570                                         if (user)
 571                                         {
 572                                                 user->WriteServ("NOTICE %s :*** Failed to load core command %s: %s", user->nick, entry->d_name, err);
 573                                         }
 574                                         else
 575                                         {
 576                                                 printf("Error loading %s: %s", entry->d_name, err);
 577                                                 exit(EXIT_STATUS_BADHANDLER);
 578                                         }
 579                                 }
 580                         }
 581                 }
 582                 closedir(library);
 583                 if (!user)
 584                         printf("\n");
 585         }
 586
 587         if (cmdlist.find("RELOAD") == cmdlist.end())
 588                 this->CreateCommand(new cmd_reload(ServerInstance));
 589 }
 590
 591 int CommandParser::TranslateUIDs(TranslateType to, const std::string &source, std::string &dest)
 592 {
 593         User* user = NULL;
 594         std::string item;
 595         int translations = 0;
 596         dest.clear();
 597
 598         switch (to)
 599         {
 600                 case TR_NICK:
 601                         /* Translate single nickname */
 602                         user = ServerInstance->FindNick(source);
 603                         if (user)
 604                         {
 605                                 dest = user->uuid;
 606                                 translations++;
 607                         }
 608                         else
 609                                 dest = source;
 610                 break;
 611                 case TR_NICKLIST:
 612                 {
 613                         /* Translate comma seperated list of nicknames */
 614                         irc::commasepstream items(source);
 615                         while (items.GetToken(item))
 616                         {
 617                                 user = ServerInstance->FindNick(item);
 618                                 if (user)
 619                                 {
 620                                         dest.append(user->uuid);
 621                                         translations++;
 622                                 }
 623                                 else
 624                                         dest.append(item);
 625                                 dest.append(",");
 626                         }
 627                         if (!dest.empty())
 628                                 dest.erase(dest.end() - 1);
 629                 }
 630                 break;
 631                 case TR_SPACENICKLIST:
 632                 {
 633                         /* Translate space seperated list of nicknames */
 634                         irc::spacesepstream items(source);
 635                         while (items.GetToken(item))
 636                         {
 637                                 user = ServerInstance->FindNick(item);
 638                                 if (user)
 639                                 {
 640                                         dest.append(user->uuid);
 641                                         translations++;
 642                                 }
 643                                 else
 644                                         dest.append(item);
 645                                 dest.append(" ");
 646                         }
 647                         if (!dest.empty())
 648                                 dest.erase(dest.end() - 1);
 649                 }
 650                 break;
 651                 case TR_END:
 652                 case TR_TEXT:
 653                 default:
 654                         /* Do nothing */
 655                         dest = source;
 656                 break;
 657         }
 658
 659         return translations;
 660 }
 661