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