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