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                         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 (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 184         {
 185                 if (dupes.find(item.c_str()) == dupes.end())
 186                 {
 187                         const char* new_parameters[127];
 188
 189                         for (int t = 0; (t < pcnt) && (t < 127); 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         nspace::hash_map<std::string,command_t*>::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->modes[n->second->flags_needed-65]))
 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         nspace::hash_map<std::string,command_t*>::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         nspace::hash_map<std::string,command_t*>::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->modes[n->second->flags_needed-65]))
 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[127];
 274         int items = 0;
 275         irc::tokenstream tokens(cmd);
 276         std::string command = tokens.GetToken();
 277
 278         while (((para[items] = tokens.GetToken()) != "") && (items < 127))
 279         {
 280                 command_p[items] = para[items].c_str();
 281                 items++;
 282         }
 283
 284         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 285
 286         int MOD_RESULT = 0;
 287         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 288         if (MOD_RESULT == 1) {
 289                 return;
 290         }
 291
 292         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 293
 294         if (cm != cmdlist.end())
 295         {
 296                 if (user)
 297                 {
 298                         /* activity resets the ping pending timer */
 299                         user->nping = ServerInstance->Time() + user->pingmax;
 300                         if (cm->second->flags_needed)
 301                         {
 302                                 if (!user->IsModeSet(cm->second->flags_needed))
 303                                 {
 304                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privileges",user->nick);
 305                                         return;
 306                                 }
 307                                 if (!user->HasPermission(command))
 308                                 {
 309                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 310                                         return;
 311                                 }
 312                         }
 313                         if ((user->registered == REG_ALL) && (!*user->oper) && (cm->second->IsDisabled()))
 314                         {
 315                                 /* command is disabled! */
 316                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 317                                 return;
 318                         }
 319                         if (items < cm->second->min_params)
 320                         {
 321                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 322                                 /* If syntax is given, display this as the 461 reply */
 323                                 if ((ServerInstance->Config->SyntaxHints) && (cm->second->syntax.length()))
 324                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 325                                 return;
 326                         }
 327                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 328                         {
 329                                 /* ikky /stats counters */
 330                                 cm->second->use_count++;
 331                                 cm->second->total_bytes += cmd.length();
 332
 333                                 int MOD_RESULT = 0;
 334                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 335                                 if (MOD_RESULT == 1)
 336                                         return;
 337
 338                                 /*
 339                                  * WARNING: nothing may come after the
 340                                  * command handler call, as the handler
 341                                  * may free the user structure!
 342                                  */
 343                                 CmdResult result = cm->second->Handle(command_p,items,user);
 344
 345                                 FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 346                                 return;
 347                         }
 348                         else
 349                         {
 350                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 351                                 return;
 352                         }
 353                 }
 354         }
 355         else if (user)
 356         {
 357                 ServerInstance->stats->statsUnknown++;
 358                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 359         }
 360 }
 361
 362 bool CommandParser::RemoveCommands(const char* source)
 363 {
 364         nspace::hash_map<std::string,command_t*>::iterator i,safei;
 365         for (i = cmdlist.begin(); i != cmdlist.end(); i++)
 366         {
 367                 safei = i;
 368                 safei++;
 369                 if (safei != cmdlist.end())
 370                 {
 371                         RemoveCommand(safei, source);
 372                 }
 373         }
 374         safei = cmdlist.begin();
 375         if (safei != cmdlist.end())
 376         {
 377                 RemoveCommand(safei, source);
 378         }
 379         return true;
 380 }
 381
 382 void CommandParser::RemoveCommand(nspace::hash_map<std::string,command_t*>::iterator safei, const char* source)
 383 {
 384         command_t* x = safei->second;
 385         if (x->source == std::string(source))
 386         {
 387                 cmdlist.erase(safei);
 388         }
 389 }
 390
 391 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 392 {
 393         std::string::size_type a;
 394
 395         if (!user)
 396                 return;
 397
 398         while ((a = buffer.rfind("\n")) != std::string::npos)
 399                 buffer.erase(a);
 400         while ((a = buffer.rfind("\r")) != std::string::npos)
 401                 buffer.erase(a);
 402
 403         if (buffer.length())
 404         {
 405                 if (!user->muted)
 406                 {
 407                         ServerInstance->Log(DEBUG,"-> :%s %s",user->nick,buffer.c_str());
 408                         this->ProcessCommand(user,buffer);
 409                 }
 410         }
 411 }
 412
 413 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 414 {
 415         if (so_handle)
 416         {
 417                 if (RFCCommands.find(f->command) == RFCCommands.end())
 418                         RFCCommands[f->command] = so_handle;
 419                 else
 420                 {
 421                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 422                         return false;
 423                 }
 424         }
 425
 426         /* create the command and push it onto the table */
 427         if (cmdlist.find(f->command) == cmdlist.end())
 428         {
 429                 cmdlist[f->command] = f;
 430                 return true;
 431         }
 432         else return false;
 433 }
 434
 435 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 436 {
 437         para.resize(128);
 438         this->SetupCommandTable();
 439 }
 440
 441 bool CommandParser::FindSym(void** v, void* h)
 442 {
 443         *v = dlsym(h, "init_command");
 444         const char* err = dlerror();
 445         if (err)
 446         {
 447                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 448                 return false;
 449         }
 450         return true;
 451 }
 452
 453 bool CommandParser::ReloadCommand(const char* cmd)
 454 {
 455         char filename[MAXBUF];
 456         char commandname[MAXBUF];
 457         int y = 0;
 458
 459         for (const char* x = cmd; *x; x++, y++)
 460                 commandname[y] = toupper(*x);
 461
 462         commandname[y] = 0;
 463
 464         SharedObjectList::iterator command = RFCCommands.find(commandname);
 465
 466         if (command != RFCCommands.end())
 467         {
 468                 command_t* cmdptr = cmdlist.find(commandname)->second;
 469                 cmdlist.erase(cmdlist.find(commandname));
 470
 471                 for (char* x = commandname; *x; x++)
 472                         *x = tolower(*x);
 473
 474
 475                 delete cmdptr;
 476                 dlclose(command->second);
 477                 RFCCommands.erase(command);
 478
 479                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 480                 this->LoadCommand(filename);
 481
 482                 return true;
 483         }
 484
 485         return false;
 486 }
 487
 488 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 489 {
 490         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 491         if (ServerInstance->Parser->ReloadCommand(parameters[0]))
 492         {
 493                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 494                 ServerInstance->WriteOpers("*** RELOAD: %s reloaded the '%s' command.", user->nick, parameters[0]);
 495                 return CMD_SUCCESS;
 496         }
 497         else
 498         {
 499                 user->WriteServ("NOTICE %s :*** Could not reload command '%s'", user->nick, parameters[0]);
 500                 return CMD_FAILURE;
 501         }
 502 }
 503
 504 void CommandParser::LoadCommand(const char* name)
 505 {
 506         char filename[MAXBUF];
 507         void* h;
 508         command_t* (*cmd_factory_func)(InspIRCd*);
 509
 510         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 511         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 512
 513         if (!h)
 514         {
 515                 ServerInstance->Log(SPARSE, "Error loading core command: %s", dlerror());
 516                 return;
 517         }
 518
 519         if (this->FindSym((void **)&cmd_factory_func, h))
 520         {
 521                 command_t* newcommand = cmd_factory_func(ServerInstance);
 522                 this->CreateCommand(newcommand, h);
 523         }
 524 }
 525
 526 void CommandParser::SetupCommandTable()
 527 {
 528         RFCCommands.clear();
 529
 530         DIR* library = opendir(LIBRARYDIR);
 531         if (library)
 532         {
 533                 dirent* entry = NULL;
 534                 while ((entry = readdir(library)))
 535                 {
 536                         if (match(entry->d_name, "cmd_*.so"))
 537                         {
 538                                 this->LoadCommand(entry->d_name);
 539                         }
 540                 }
 541                 closedir(library);
 542         }
 543
 544         this->CreateCommand(new cmd_reload(ServerInstance));
 545 }
 546