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 extrastuff;
 138         std::string item;
 139         unsigned int max = 0;
 140
 141         /* Attempt to iterate these lists and call the command objech
 142          * which called us, for every parameter pair until there are
 143          * no more left to parse.
 144          */
 145         while (items1.GetToken(item) && (max++ < ServerInstance->Config->MaxTargets))
 146         {
 147                 if (dupes.find(item.c_str()) == dupes.end())
 148                 {
 149                         const char* new_parameters[MAXPARAMETERS];
 150
 151                         for (int t = 0; (t < pcnt) && (t < MAXPARAMETERS); t++)
 152                                 new_parameters[t] = parameters[t];
 153
 154                         if (!items2.GetToken(extrastuff))
 155                                 extrastuff = "";
 156
 157                         new_parameters[splithere] = item.c_str();
 158                         new_parameters[extra] = extrastuff.c_str();
 159
 160                         CommandObj->Handle(new_parameters,pcnt,user);
 161
 162                         dupes[item.c_str()] = true;
 163                 }
 164         }
 165         return 1;
 166 }
 167
 168 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 169 {
 170         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 171          * which called us just carries on as it was.
 172          */
 173         if (!strchr(parameters[splithere],','))
 174                 return 0;
 175
 176         std::map<irc::string, bool> dupes;
 177
 178         /* Only one commasepstream here */
 179         irc::commasepstream items1(parameters[splithere]);
 180         std::string item;
 181         unsigned int max = 0;
 182
 183         /* Parse the commasepstream until there are no tokens remaining.
 184          * Each token we parse out, call the command handler that called us
 185          * with it
 186          */
 187         while (items1.GetToken(item) && (max++ < ServerInstance->Config->MaxTargets))
 188         {
 189                 if (dupes.find(item.c_str()) == dupes.end())
 190                 {
 191                         const char* new_parameters[MAXPARAMETERS];
 192
 193                         for (int t = 0; (t < pcnt) && (t < MAXPARAMETERS); t++)
 194                                 new_parameters[t] = parameters[t];
 195
 196                         new_parameters[splithere] = item.c_str();
 197
 198                         parameters[splithere] = item.c_str();
 199
 200                         /* Execute the command handler over and over. If someone pulls our user
 201                          * record out from under us (e.g. if we /kill a comma sep list, and we're
 202                          * in that list ourselves) abort if we're gone.
 203                          */
 204                         CommandObj->Handle(new_parameters,pcnt,user);
 205
 206                         dupes[item.c_str()] = true;
 207                 }
 208         }
 209         /* By returning 1 we tell our caller that nothing is to be done,
 210          * as all the previous calls handled the data. This makes the parent
 211          * return without doing any processing.
 212          */
 213         return 1;
 214 }
 215
 216 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 217 {
 218         command_table::iterator n = cmdlist.find(commandname);
 219
 220         if (n != cmdlist.end())
 221         {
 222                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 223                 {
 224                         if ((!n->second->flags_needed) || (user->IsModeSet(n->second->flags_needed)))
 225                         {
 226                                 if (n->second->flags_needed)
 227                                 {
 228                                         return ((user->HasPermission(commandname)) || (ServerInstance->ULine(user->server)));
 229                                 }
 230                                 return true;
 231                         }
 232                 }
 233         }
 234         return false;
 235 }
 236
 237 command_t* CommandParser::GetHandler(const std::string &commandname)
 238 {
 239         command_table::iterator n = cmdlist.find(commandname);
 240         if (n != cmdlist.end())
 241                 return n->second;
 242
 243         return NULL;
 244 }
 245
 246 // calls a handler function for a command
 247
 248 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 249 {
 250         command_table::iterator n = cmdlist.find(commandname);
 251
 252         if (n != cmdlist.end())
 253         {
 254                 if (pcnt >= n->second->min_params)
 255                 {
 256                         if ((!n->second->flags_needed) || (user->IsModeSet(n->second->flags_needed)))
 257                         {
 258                                 if (n->second->flags_needed)
 259                                 {
 260                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 261                                         {
 262                                                 return n->second->Handle(parameters,pcnt,user);
 263                                         }
 264                                 }
 265                                 else
 266                                 {
 267                                         return n->second->Handle(parameters,pcnt,user);
 268                                 }
 269                         }
 270                 }
 271         }
 272         return CMD_INVALID;
 273 }
 274
 275 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 276 {
 277         const char *command_p[MAXPARAMETERS];
 278         int items = 0;
 279         irc::tokenstream tokens(cmd);
 280         std::string command;
 281         tokens.GetToken(command);
 282
 283         /* A client sent a nick prefix on their command (ick)
 284          * rhapsody and some braindead bouncers do this --
 285          * the rfc says they shouldnt but also says the ircd should
 286          * discard it if they do.
 287          */
 288         if (*command.c_str() == ':')
 289                 tokens.GetToken(command);
 290
 291         while (tokens.GetToken(para[items]) && (items < MAXPARAMETERS))
 292         {
 293                 command_p[items] = para[items].c_str();
 294                 items++;
 295         }
 296
 297         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 298
 299         int MOD_RESULT = 0;
 300         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 301         if (MOD_RESULT == 1) {
 302                 return;
 303         }
 304
 305         command_table::iterator cm = cmdlist.find(command);
 306
 307         if (cm != cmdlist.end())
 308         {
 309                 if (user)
 310                 {
 311                         /* activity resets the ping pending timer */
 312                         user->nping = ServerInstance->Time() + user->pingmax;
 313                         if (cm->second->flags_needed)
 314                         {
 315                                 if (!user->IsModeSet(cm->second->flags_needed))
 316                                 {
 317                                         user->WriteServ("481 %s :Permission Denied - You do not have the required operator privileges",user->nick);
 318                                         return;
 319                                 }
 320                                 if (!user->HasPermission(command))
 321                                 {
 322                                         user->WriteServ("481 %s :Permission Denied - Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 323                                         return;
 324                                 }
 325                         }
 326                         if ((user->registered == REG_ALL) && (!IS_OPER(user)) && (cm->second->IsDisabled()))
 327                         {
 328                                 /* command is disabled! */
 329                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 330                                 ServerInstance->SNO->WriteToSnoMask('d', "%s denied for %s (%s@%s)",
 331                                                 command.c_str(), user->nick, user->ident, user->host);
 332                                 return;
 333                         }
 334                         if (items < cm->second->min_params)
 335                         {
 336                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 337                                 if ((ServerInstance->Config->SyntaxHints) && (user->registered == REG_ALL) && (cm->second->syntax.length()))
 338                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 339                                 return;
 340                         }
 341                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 342                         {
 343                                 /* ikky /stats counters */
 344                                 cm->second->use_count++;
 345                                 cm->second->total_bytes += cmd.length();
 346
 347                                 int MOD_RESULT = 0;
 348                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 349                                 if (MOD_RESULT == 1)
 350                                         return;
 351
 352                                 /*
 353                                  * WARNING: nothing should come after this, as the user may be on a cull list to
 354                                  * be nuked next loop iteration. be sensible.
 355                                  */
 356                                 CmdResult result = cm->second->Handle(command_p,items,user);
 357
 358                                 FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 359                                 return;
 360                         }
 361                         else
 362                         {
 363                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 364                                 return;
 365                         }
 366                 }
 367         }
 368         else if (user)
 369         {
 370                 ServerInstance->stats->statsUnknown++;
 371                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 372         }
 373 }
 374
 375 bool CommandParser::RemoveCommands(const char* source)
 376 {
 377         command_table::iterator i,safei;
 378         for (i = cmdlist.begin(); i != cmdlist.end(); i++)
 379         {
 380                 safei = i;
 381                 safei++;
 382                 if (safei != cmdlist.end())
 383                 {
 384                         RemoveCommand(safei, source);
 385                 }
 386         }
 387         safei = cmdlist.begin();
 388         if (safei != cmdlist.end())
 389         {
 390                 RemoveCommand(safei, source);
 391         }
 392         return true;
 393 }
 394
 395 void CommandParser::RemoveCommand(command_table::iterator safei, const char* source)
 396 {
 397         command_t* x = safei->second;
 398         if (x->source == std::string(source))
 399         {
 400                 cmdlist.erase(safei);
 401                 delete x;
 402         }
 403 }
 404
 405 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 406 {
 407         std::string::size_type a;
 408
 409         if (!user)
 410                 return;
 411
 412         while ((a = buffer.rfind("\n")) != std::string::npos)
 413                 buffer.erase(a);
 414         while ((a = buffer.rfind("\r")) != std::string::npos)
 415                 buffer.erase(a);
 416
 417         if (buffer.length())
 418         {
 419                 if (!user->muted)
 420                 {
 421                         ServerInstance->Log(DEBUG,"C[%d] -> :%s %s",user->GetFd(), user->nick, buffer.c_str());
 422                         this->ProcessCommand(user,buffer);
 423                 }
 424         }
 425 }
 426
 427 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 428 {
 429         if (so_handle)
 430         {
 431                 if (RFCCommands.find(f->command) == RFCCommands.end())
 432                         RFCCommands[f->command] = so_handle;
 433                 else
 434                 {
 435                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 436                         return false;
 437                 }
 438         }
 439
 440         /* create the command and push it onto the table */
 441         if (cmdlist.find(f->command) == cmdlist.end())
 442         {
 443                 cmdlist[f->command] = f;
 444                 return true;
 445         }
 446         else return false;
 447 }
 448
 449 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 450 {
 451         para.resize(128);
 452 }
 453
 454 bool CommandParser::FindSym(void** v, void* h)
 455 {
 456         *v = dlsym(h, "init_command");
 457         const char* err = dlerror();
 458         if (err && !(*v))
 459         {
 460                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 461                 return false;
 462         }
 463         return true;
 464 }
 465
 466 bool CommandParser::ReloadCommand(const char* cmd, userrec* user)
 467 {
 468         char filename[MAXBUF];
 469         char commandname[MAXBUF];
 470         int y = 0;
 471
 472         for (const char* x = cmd; *x; x++, y++)
 473                 commandname[y] = toupper(*x);
 474
 475         commandname[y] = 0;
 476
 477         SharedObjectList::iterator command = RFCCommands.find(commandname);
 478
 479         if (command != RFCCommands.end())
 480         {
 481                 command_t* cmdptr = cmdlist.find(commandname)->second;
 482                 cmdlist.erase(cmdlist.find(commandname));
 483
 484                 for (char* x = commandname; *x; x++)
 485                         *x = tolower(*x);
 486
 487
 488                 delete cmdptr;
 489                 dlclose(command->second);
 490                 RFCCommands.erase(command);
 491
 492                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 493                 const char* err = this->LoadCommand(filename);
 494                 if (err)
 495                 {
 496                         if (user)
 497                                 user->WriteServ("NOTICE %s :*** Error loading 'cmd_%s.so': %s", user->nick, cmd, err);
 498                         return false;
 499                 }
 500
 501                 return true;
 502         }
 503
 504         return false;
 505 }
 506
 507 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 508 {
 509         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 510         if (ServerInstance->Parser->ReloadCommand(parameters[0], user))
 511         {
 512                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 513                 ServerInstance->WriteOpers("*** RELOAD: %s reloaded the '%s' command.", user->nick, parameters[0]);
 514                 return CMD_SUCCESS;
 515         }
 516         else
 517         {
 518                 user->WriteServ("NOTICE %s :*** Could not reload command '%s' -- fix this problem, then /REHASH as soon as possible!", user->nick, parameters[0]);
 519                 return CMD_FAILURE;
 520         }
 521 }
 522
 523 const char* CommandParser::LoadCommand(const char* name)
 524 {
 525         char filename[MAXBUF];
 526         void* h;
 527         command_t* (*cmd_factory_func)(InspIRCd*);
 528
 529         /* Command already exists? Succeed silently - this is needed for REHASH */
 530         if (RFCCommands.find(name) != RFCCommands.end())
 531         {
 532                 ServerInstance->Log(DEBUG,"Not reloading command %s/%s, it already exists", LIBRARYDIR, name);
 533                 return NULL;
 534         }
 535
 536         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 537         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 538
 539         if (!h)
 540         {
 541                 const char* n = dlerror();
 542                 ServerInstance->Log(SPARSE, "Error loading core command: %s", n);
 543                 return n;
 544         }
 545
 546         if (this->FindSym((void **)&cmd_factory_func, h))
 547         {
 548                 command_t* newcommand = cmd_factory_func(ServerInstance);
 549                 this->CreateCommand(newcommand, h);
 550         }
 551         return NULL;
 552 }
 553
 554 void CommandParser::SetupCommandTable(userrec* user)
 555 {
 556         RFCCommands.clear();
 557
 558         if (!user)
 559         {
 560                 printf("\nLoading core commands");
 561                 fflush(stdout);
 562         }
 563
 564         DIR* library = opendir(LIBRARYDIR);
 565         if (library)
 566         {
 567                 dirent* entry = NULL;
 568                 while ((entry = readdir(library)))
 569                 {
 570                         if (match(entry->d_name, "cmd_*.so"))
 571                         {
 572                                 if (!user)
 573                                 {
 574                                         printf(".");
 575                                         fflush(stdout);
 576                                 }
 577                                 const char* err = this->LoadCommand(entry->d_name);
 578                                 if (err)
 579                                 {
 580                                         if (user)
 581                                         {
 582                                                 user->WriteServ("NOTICE %s :*** Failed to load core command %s: %s", user->nick, entry->d_name, err);
 583                                         }
 584                                         else
 585                                         {
 586                                                 printf("Error loading %s: %s", entry->d_name, err);
 587                                                 exit(EXIT_STATUS_BADHANDLER);
 588                                         }
 589                                 }
 590                         }
 591                 }
 592                 closedir(library);
 593                 if (!user)
 594                         printf("\n");
 595         }
 596
 597         if (cmdlist.find("RELOAD") == cmdlist.end())
 598                 this->CreateCommand(new cmd_reload(ServerInstance));
 599 }
 600