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 <dirent.h>
  18 #include <dlfcn.h>
  19 #include "users.h"
  20 #include "modules.h"
  21 #include "wildcard.h"
  22 #include "xline.h"
  23 #include "socketengine.h"
  24 #include "socket.h"
  25 #include "command_parse.h"
  26
  27 bool InspIRCd::ULine(const char* server)
  28 {
  29         if (!server)
  30                 return false;
  31         if (!*server)
  32                 return true;
  33
  34         return (find(Config->ulines.begin(),Config->ulines.end(),server) != Config->ulines.end());
  35 }
  36
  37 int InspIRCd::OperPassCompare(const char* data,const char* input, int tagnumber)
  38 {
  39         int MOD_RESULT = 0;
  40         FOREACH_RESULT_I(this,I_OnOperCompare,OnOperCompare(data, input, tagnumber))
  41         if (MOD_RESULT == 1)
  42                 return 0;
  43         if (MOD_RESULT == -1)
  44                 return 1;
  45         return strcmp(data,input);
  46 }
  47
  48 long InspIRCd::Duration(const char* str)
  49 {
  50         char n_field[MAXBUF];
  51         long total = 0;
  52         n_field[0] = 0;
  53
  54         if ((!strchr(str,'s')) && (!strchr(str,'m')) && (!strchr(str,'h')) && (!strchr(str,'d')) && (!strchr(str,'w')) && (!strchr(str,'y')))
  55         {
  56                 std::string n = str;
  57                 n += 's';
  58                 return Duration(n.c_str());
  59         }
  60
  61         for (char* i = (char*)str; *i; i++)
  62         {
  63                 // if we have digits, build up a string for the value in n_field,
  64                 // up to 10 digits in size.
  65                 if ((*i >= '0') && (*i <= '9'))
  66                 {
  67                         strlcat(n_field,i,10);
  68                 }
  69                 else
  70                 {
  71                         // we dont have a digit, check for numeric tokens
  72                         switch (tolower(*i))
  73                         {
  74                                 case 's':
  75                                         total += atoi(n_field);
  76                                 break;
  77
  78                                 case 'm':
  79                                         total += (atoi(n_field)*duration_m);
  80                                 break;
  81
  82                                 case 'h':
  83                                         total += (atoi(n_field)*duration_h);
  84                                 break;
  85
  86                                 case 'd':
  87                                         total += (atoi(n_field)*duration_d);
  88                                 break;
  89
  90                                 case 'w':
  91                                         total += (atoi(n_field)*duration_w);
  92                                 break;
  93
  94                                 case 'y':
  95                                         total += (atoi(n_field)*duration_y);
  96                                 break;
  97                         }
  98                         n_field[0] = 0;
  99                 }
 100         }
 101         // add trailing seconds
 102         total += atoi(n_field);
 103
 104         return total;
 105 }
 106
 107 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
 108  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
 109  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
 110  * the channel names and their keys as follows:
 111  * JOIN #chan1,#chan2,#chan3 key1,,key3
 112  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
 113  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
 114  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
 115  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
 116  */
 117 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
 118 {
 119         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 120          * which called us just carries on as it was.
 121          */
 122         if (!strchr(parameters[splithere],','))
 123                 return 0;
 124
 125         /** Some lame ircds will weed out dupes using some shitty O(n^2) algorithm.
 126          * By using std::map (thanks for the idea w00t) we can cut this down a ton.
 127          * ...VOOODOOOO!
 128          */
 129         std::map<irc::string, bool> dupes;
 130
 131         /* Create two lists, one for channel names, one for keys
 132          */
 133         irc::commasepstream items1(parameters[splithere]);
 134         irc::commasepstream items2(parameters[extra]);
 135         std::string item = "*";
 136         unsigned int max = 0;
 137
 138         /* Attempt to iterate these lists and call the command objech
 139          * which called us, for every parameter pair until there are
 140          * no more left to parse.
 141          */
 142         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 143         {
 144                 if (dupes.find(item.c_str()) == dupes.end())
 145                 {
 146                         const char* new_parameters[127];
 147
 148                         for (int t = 0; (t < pcnt) && (t < 127); t++)
 149                                 new_parameters[t] = parameters[t];
 150
 151                         std::string extrastuff = items2.GetToken();
 152
 153                         new_parameters[splithere] = item.c_str();
 154                         new_parameters[extra] = extrastuff.c_str();
 155
 156                         if (CommandObj->Handle(new_parameters,pcnt,user) == CMD_USER_DELETED)
 157                                 return 1;
 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[127];
 189
 190                         for (int t = 0; (t < pcnt) && (t < 127); 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                         if (CommandObj->Handle(new_parameters,pcnt,user) == CMD_USER_DELETED)
 202                                 return 1;
 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         nspace::hash_map<std::string,command_t*>::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->modes[n->second->flags_needed-65]))
 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         nspace::hash_map<std::string,command_t*>::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         nspace::hash_map<std::string,command_t*>::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->modes[n->second->flags_needed-65]))
 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[127];
 276         int items = 0;
 277         irc::tokenstream tokens(cmd);
 278         std::string command = tokens.GetToken();
 279
 280         while (((para[items] = tokens.GetToken()) != "") && (items < 127))
 281         {
 282                 command_p[items] = para[items].c_str();
 283                 items++;
 284         }
 285
 286         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 287
 288         int MOD_RESULT = 0;
 289         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 290         if (MOD_RESULT == 1) {
 291                 return;
 292         }
 293
 294         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 295
 296         if (cm != cmdlist.end())
 297         {
 298                 if (user)
 299                 {
 300                         /* activity resets the ping pending timer */
 301                         user->nping = ServerInstance->Time() + user->pingmax;
 302                         if (cm->second->flags_needed)
 303                         {
 304                                 if (!user->IsModeSet(cm->second->flags_needed))
 305                                 {
 306                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privileges",user->nick);
 307                                         return;
 308                                 }
 309                                 if (!user->HasPermission(command))
 310                                 {
 311                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 312                                         return;
 313                                 }
 314                         }
 315                         if ((user->registered == REG_ALL) && (!*user->oper) && (cm->second->IsDisabled()))
 316                         {
 317                                 /* command is disabled! */
 318                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 319                                 return;
 320                         }
 321                         if (items < cm->second->min_params)
 322                         {
 323                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 324                                 /* If syntax is given, display this as the 461 reply */
 325                                 if ((ServerInstance->Config->SyntaxHints) && (cm->second->syntax.length()))
 326                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 327                                 return;
 328                         }
 329                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 330                         {
 331                                 /* ikky /stats counters */
 332                                 cm->second->use_count++;
 333                                 cm->second->total_bytes += cmd.length();
 334
 335                                 int MOD_RESULT = 0;
 336                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 337                                 if (MOD_RESULT == 1)
 338                                         return;
 339
 340                                 /*
 341                                  * WARNING: nothing may come after the
 342                                  * command handler call, as the handler
 343                                  * may free the user structure!
 344                                  */
 345                                 CmdResult result = cm->second->Handle(command_p,items,user);
 346
 347                                 if (result != CMD_USER_DELETED)
 348                                 {
 349                                         FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 350                                 }
 351                                 return;
 352                         }
 353                         else
 354                         {
 355                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 356                                 return;
 357                         }
 358                 }
 359         }
 360         else if (user)
 361         {
 362                 ServerInstance->stats->statsUnknown++;
 363                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 364         }
 365 }
 366
 367 bool CommandParser::RemoveCommands(const char* source)
 368 {
 369         nspace::hash_map<std::string,command_t*>::iterator i,safei;
 370         for (i = cmdlist.begin(); i != cmdlist.end(); i++)
 371         {
 372                 safei = i;
 373                 safei++;
 374                 if (safei != cmdlist.end())
 375                 {
 376                         RemoveCommand(safei, source);
 377                 }
 378         }
 379         safei = cmdlist.begin();
 380         if (safei != cmdlist.end())
 381         {
 382                 RemoveCommand(safei, source);
 383         }
 384         return true;
 385 }
 386
 387 void CommandParser::RemoveCommand(nspace::hash_map<std::string,command_t*>::iterator safei, const char* source)
 388 {
 389         command_t* x = safei->second;
 390         if (x->source == std::string(source))
 391         {
 392                 cmdlist.erase(safei);
 393         }
 394 }
 395
 396 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 397 {
 398         std::string::size_type a;
 399
 400         if (!user)
 401                 return;
 402
 403         while ((a = buffer.rfind("\n")) != std::string::npos)
 404                 buffer.erase(a);
 405         while ((a = buffer.rfind("\r")) != std::string::npos)
 406                 buffer.erase(a);
 407
 408         if (buffer.length())
 409         {
 410                 ServerInstance->Log(DEBUG,"-> :%s %s",user->nick,buffer.c_str());
 411                 this->ProcessCommand(user,buffer);
 412         }
 413 }
 414
 415 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 416 {
 417         if (so_handle)
 418         {
 419                 if (RFCCommands.find(f->command) == RFCCommands.end())
 420                         RFCCommands[f->command] = so_handle;
 421                 else
 422                 {
 423                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 424                         return false;
 425                 }
 426         }
 427
 428         /* create the command and push it onto the table */
 429         if (cmdlist.find(f->command) == cmdlist.end())
 430         {
 431                 cmdlist[f->command] = f;
 432                 return true;
 433         }
 434         else return false;
 435 }
 436
 437 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 438 {
 439         para.resize(128);
 440         this->SetupCommandTable();
 441 }
 442
 443 bool CommandParser::FindSym(void** v, void* h)
 444 {
 445         *v = dlsym(h, "init_command");
 446         const char* err = dlerror();
 447         if (err)
 448         {
 449                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 450                 return false;
 451         }
 452         return true;
 453 }
 454
 455 bool CommandParser::ReloadCommand(const char* cmd)
 456 {
 457         char filename[MAXBUF];
 458         char commandname[MAXBUF];
 459         int y = 0;
 460
 461         for (const char* x = cmd; *x; x++, y++)
 462                 commandname[y] = toupper(*x);
 463
 464         commandname[y] = 0;
 465
 466         SharedObjectList::iterator command = RFCCommands.find(commandname);
 467
 468         if (command != RFCCommands.end())
 469         {
 470                 command_t* cmdptr = cmdlist.find(commandname)->second;
 471                 cmdlist.erase(cmdlist.find(commandname));
 472
 473                 for (char* x = commandname; *x; x++)
 474                         *x = tolower(*x);
 475
 476
 477                 delete cmdptr;
 478                 dlclose(command->second);
 479                 RFCCommands.erase(command);
 480
 481                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 482                 this->LoadCommand(filename);
 483
 484                 return true;
 485         }
 486
 487         return false;
 488 }
 489
 490 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 491 {
 492         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 493         if (ServerInstance->Parser->ReloadCommand(parameters[0]))
 494         {
 495                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 496                 ServerInstance->WriteOpers("*** RELOAD: %s reloaded the '%s' command.", user->nick, parameters[0]);
 497                 return CMD_SUCCESS;
 498         }
 499         else
 500         {
 501                 user->WriteServ("NOTICE %s :*** Could not reload command '%s'", user->nick, parameters[0]);
 502                 return CMD_FAILURE;
 503         }
 504 }
 505
 506 void CommandParser::LoadCommand(const char* name)
 507 {
 508         char filename[MAXBUF];
 509         void* h;
 510         command_t* (*cmd_factory_func)(InspIRCd*);
 511
 512         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 513         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 514
 515         if (!h)
 516         {
 517                 ServerInstance->Log(SPARSE, "Error loading core command: %s", dlerror());
 518                 return;
 519         }
 520
 521         if (this->FindSym((void **)&cmd_factory_func, h))
 522         {
 523                 command_t* newcommand = cmd_factory_func(ServerInstance);
 524                 this->CreateCommand(newcommand, h);
 525         }
 526 }
 527
 528 void CommandParser::SetupCommandTable()
 529 {
 530         RFCCommands.clear();
 531
 532         DIR* library = opendir(LIBRARYDIR);
 533         if (library)
 534         {
 535                 dirent* entry = NULL;
 536                 while ((entry = readdir(library)))
 537                 {
 538                         if (match(entry->d_name, "cmd_*.so"))
 539                         {
 540                                 this->LoadCommand(entry->d_name);
 541                         }
 542                 }
 543                 closedir(library);
 544         }
 545
 546         this->CreateCommand(new cmd_reload(ServerInstance));
 547 }
 548