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                         if ((!n->second->flags_needed) || (user->IsModeSet(n->second->flags_needed)))
 253                         {
 254                                 if (n->second->flags_needed)
 255                                 {
 256                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 257                                         {
 258                                                 return n->second->Handle(parameters,pcnt,user);
 259                                         }
 260                                 }
 261                                 else
 262                                 {
 263                                         return n->second->Handle(parameters,pcnt,user);
 264                                 }
 265                         }
 266                 }
 267         }
 268         return CMD_INVALID;
 269 }
 270
 271 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 272 {
 273         const char *command_p[MAXPARAMETERS];
 274         int items = 0;
 275         irc::tokenstream tokens(cmd);
 276         std::string command;
 277         tokens.GetToken(command);
 278
 279         /* A client sent a nick prefix on their command (ick)
 280          * rhapsody and some braindead bouncers do this --
 281          * the rfc says they shouldnt but also says the ircd should
 282          * discard it if they do.
 283          */
 284         if (*command.c_str() == ':')
 285                 tokens.GetToken(command);
 286
 287         while (tokens.GetToken(para[items]) && (items < MAXPARAMETERS))
 288         {
 289                 command_p[items] = para[items].c_str();
 290                 items++;
 291         }
 292
 293         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 294
 295         int MOD_RESULT = 0;
 296         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 297         if (MOD_RESULT == 1) {
 298                 return;
 299         }
 300
 301         command_table::iterator cm = cmdlist.find(command);
 302
 303         if (cm != cmdlist.end())
 304         {
 305                 if (user)
 306                 {
 307                         /* activity resets the ping pending timer */
 308                         user->nping = ServerInstance->Time() + user->pingmax;
 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;
 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;
 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;
 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;
 336                         }
 337                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 338                         {
 339                                 /* ikky /stats counters */
 340                                 cm->second->use_count++;
 341                                 cm->second->total_bytes += cmd.length();
 342
 343                                 int MOD_RESULT = 0;
 344                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 345                                 if (MOD_RESULT == 1)
 346                                         return;
 347
 348                                 /*
 349                                  * WARNING: nothing should come after this, as the user may be on a cull list to
 350                                  * be nuked next loop iteration. be sensible.
 351                                  */
 352                                 CmdResult result = cm->second->Handle(command_p,items,user);
 353
 354                                 FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 355                                 return;
 356                         }
 357                         else
 358                         {
 359                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 360                                 return;
 361                         }
 362                 }
 363         }
 364         else if (user)
 365         {
 366                 ServerInstance->stats->statsUnknown++;
 367                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 368         }
 369 }
 370
 371 bool CommandParser::RemoveCommands(const char* source)
 372 {
 373         command_table::iterator i,safei;
 374         for (i = cmdlist.begin(); i != cmdlist.end(); i++)
 375         {
 376                 safei = i;
 377                 safei++;
 378                 if (safei != cmdlist.end())
 379                 {
 380                         RemoveCommand(safei, source);
 381                 }
 382         }
 383         safei = cmdlist.begin();
 384         if (safei != cmdlist.end())
 385         {
 386                 RemoveCommand(safei, source);
 387         }
 388         return true;
 389 }
 390
 391 void CommandParser::RemoveCommand(command_table::iterator safei, const char* source)
 392 {
 393         command_t* x = safei->second;
 394         if (x->source == std::string(source))
 395         {
 396                 cmdlist.erase(safei);
 397                 delete x;
 398         }
 399 }
 400
 401 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 402 {
 403         std::string::size_type a;
 404
 405         if (!user)
 406                 return;
 407
 408         while ((a = buffer.rfind("\n")) != std::string::npos)
 409                 buffer.erase(a);
 410         while ((a = buffer.rfind("\r")) != std::string::npos)
 411                 buffer.erase(a);
 412
 413         if (buffer.length())
 414         {
 415                 if (!user->muted)
 416                 {
 417                         ServerInstance->Log(DEBUG,"C[%d] -> :%s %s",user->GetFd(), user->nick, buffer.c_str());
 418                         this->ProcessCommand(user,buffer);
 419                 }
 420         }
 421 }
 422
 423 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 424 {
 425         if (so_handle)
 426         {
 427                 if (RFCCommands.find(f->command) == RFCCommands.end())
 428                         RFCCommands[f->command] = so_handle;
 429                 else
 430                 {
 431                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 432                         return false;
 433                 }
 434         }
 435
 436         /* create the command and push it onto the table */
 437         if (cmdlist.find(f->command) == cmdlist.end())
 438         {
 439                 cmdlist[f->command] = f;
 440                 return true;
 441         }
 442         else return false;
 443 }
 444
 445 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 446 {
 447         para.resize(128);
 448 }
 449
 450 bool CommandParser::FindSym(void** v, void* h)
 451 {
 452         *v = dlsym(h, "init_command");
 453         const char* err = dlerror();
 454         if (err && !(*v))
 455         {
 456                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 457                 return false;
 458         }
 459         return true;
 460 }
 461
 462 bool CommandParser::ReloadCommand(const char* cmd, userrec* user)
 463 {
 464         char filename[MAXBUF];
 465         char commandname[MAXBUF];
 466         int y = 0;
 467
 468         for (const char* x = cmd; *x; x++, y++)
 469                 commandname[y] = toupper(*x);
 470
 471         commandname[y] = 0;
 472
 473         SharedObjectList::iterator command = RFCCommands.find(commandname);
 474
 475         if (command != RFCCommands.end())
 476         {
 477                 command_t* cmdptr = cmdlist.find(commandname)->second;
 478                 cmdlist.erase(cmdlist.find(commandname));
 479
 480                 for (char* x = commandname; *x; x++)
 481                         *x = tolower(*x);
 482
 483
 484                 delete cmdptr;
 485                 dlclose(command->second);
 486                 RFCCommands.erase(command);
 487
 488                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 489                 const char* err = this->LoadCommand(filename);
 490                 if (err)
 491                 {
 492                         if (user)
 493                                 user->WriteServ("NOTICE %s :*** Error loading 'cmd_%s.so': %s", user->nick, cmd, err);
 494                         return false;
 495                 }
 496
 497                 return true;
 498         }
 499
 500         return false;
 501 }
 502
 503 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 504 {
 505         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 506         if (ServerInstance->Parser->ReloadCommand(parameters[0], user))
 507         {
 508                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 509                 ServerInstance->WriteOpers("*** RELOAD: %s reloaded the '%s' command.", user->nick, parameters[0]);
 510                 return CMD_SUCCESS;
 511         }
 512         else
 513         {
 514                 user->WriteServ("NOTICE %s :*** Could not reload command '%s' -- fix this problem, then /REHASH as soon as possible!", user->nick, parameters[0]);
 515                 return CMD_FAILURE;
 516         }
 517 }
 518
 519 const char* CommandParser::LoadCommand(const char* name)
 520 {
 521         char filename[MAXBUF];
 522         void* h;
 523         command_t* (*cmd_factory_func)(InspIRCd*);
 524
 525         /* Command already exists? Succeed silently - this is needed for REHASH */
 526         if (RFCCommands.find(name) != RFCCommands.end())
 527         {
 528                 ServerInstance->Log(DEBUG,"Not reloading command %s/%s, it already exists", LIBRARYDIR, name);
 529                 return NULL;
 530         }
 531
 532         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 533         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 534
 535         if (!h)
 536         {
 537                 const char* n = dlerror();
 538                 ServerInstance->Log(SPARSE, "Error loading core command: %s", n);
 539                 return n;
 540         }
 541
 542         if (this->FindSym((void **)&cmd_factory_func, h))
 543         {
 544                 command_t* newcommand = cmd_factory_func(ServerInstance);
 545                 this->CreateCommand(newcommand, h);
 546         }
 547         return NULL;
 548 }
 549
 550 void CommandParser::SetupCommandTable(userrec* user)
 551 {
 552         RFCCommands.clear();
 553
 554         if (!user)
 555         {
 556                 printf("\nLoading core commands");
 557                 fflush(stdout);
 558         }
 559
 560         DIR* library = opendir(LIBRARYDIR);
 561         if (library)
 562         {
 563                 dirent* entry = NULL;
 564                 while ((entry = readdir(library)))
 565                 {
 566                         if (match(entry->d_name, "cmd_*.so"))
 567                         {
 568                                 if (!user)
 569                                 {
 570                                         printf(".");
 571                                         fflush(stdout);
 572                                 }
 573                                 const char* err = this->LoadCommand(entry->d_name);
 574                                 if (err)
 575                                 {
 576                                         if (user)
 577                                         {
 578                                                 user->WriteServ("NOTICE %s :*** Failed to load core command %s: %s", user->nick, entry->d_name, err);
 579                                         }
 580                                         else
 581                                         {
 582                                                 printf("Error loading %s: %s", entry->d_name, err);
 583                                                 exit(EXIT_STATUS_BADHANDLER);
 584                                         }
 585                                 }
 586                         }
 587                 }
 588                 closedir(library);
 589                 if (!user)
 590                         printf("\n");
 591         }
 592
 593         if (cmdlist.find("RELOAD") == cmdlist.end())
 594                 this->CreateCommand(new cmd_reload(ServerInstance));
 595 }
 596