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 (Config->ulines.find(server) != Config->ulines.end());
  35 }
  36
  37 bool InspIRCd::SilentULine(const char* server)
  38 {
  39         std::map<irc::string,bool>::iterator n = Config->ulines.find(server);
  40         if (n != Config->ulines.end())
  41                 return n->second;
  42         else return false;
  43 }
  44
  45 int InspIRCd::OperPassCompare(const char* data,const char* input, int tagnumber)
  46 {
  47         int MOD_RESULT = 0;
  48         FOREACH_RESULT_I(this,I_OnOperCompare,OnOperCompare(data, input, tagnumber))
  49         if (MOD_RESULT == 1)
  50                 return 0;
  51         if (MOD_RESULT == -1)
  52                 return 1;
  53         return strcmp(data,input);
  54 }
  55
  56 std::string InspIRCd::TimeString(time_t curtime)
  57 {
  58         return std::string(ctime(&curtime),24);
  59 }
  60
  61 long InspIRCd::Duration(const char* str)
  62 {
  63         char n_field[MAXBUF];
  64         long total = 0;
  65         n_field[0] = 0;
  66
  67         if ((!strchr(str,'s')) && (!strchr(str,'m')) && (!strchr(str,'h')) && (!strchr(str,'d')) && (!strchr(str,'w')) && (!strchr(str,'y')))
  68         {
  69                 std::string n = str;
  70                 n += 's';
  71                 return Duration(n.c_str());
  72         }
  73
  74         for (char* i = (char*)str; *i; i++)
  75         {
  76                 // if we have digits, build up a string for the value in n_field,
  77                 // up to 10 digits in size.
  78                 if ((*i >= '0') && (*i <= '9'))
  79                 {
  80                         strlcat(n_field,i,10);
  81                 }
  82                 else
  83                 {
  84                         // we dont have a digit, check for numeric tokens
  85                         switch (tolower(*i))
  86                         {
  87                                 case 's':
  88                                         total += atoi(n_field);
  89                                 break;
  90
  91                                 case 'm':
  92                                         total += (atoi(n_field)*duration_m);
  93                                 break;
  94
  95                                 case 'h':
  96                                         total += (atoi(n_field)*duration_h);
  97                                 break;
  98
  99                                 case 'd':
 100                                         total += (atoi(n_field)*duration_d);
 101                                 break;
 102
 103                                 case 'w':
 104                                         total += (atoi(n_field)*duration_w);
 105                                 break;
 106
 107                                 case 'y':
 108                                         total += (atoi(n_field)*duration_y);
 109                                 break;
 110                         }
 111                         n_field[0] = 0;
 112                 }
 113         }
 114         // add trailing seconds
 115         total += atoi(n_field);
 116
 117         return total;
 118 }
 119
 120 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
 121  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
 122  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
 123  * the channel names and their keys as follows:
 124  * JOIN #chan1,#chan2,#chan3 key1,,key3
 125  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
 126  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
 127  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
 128  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
 129  */
 130 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
 131 {
 132         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 133          * which called us just carries on as it was.
 134          */
 135         if (!strchr(parameters[splithere],','))
 136                 return 0;
 137
 138         /** Some lame ircds will weed out dupes using some shitty O(n^2) algorithm.
 139          * By using std::map (thanks for the idea w00t) we can cut this down a ton.
 140          * ...VOOODOOOO!
 141          */
 142         std::map<irc::string, bool> dupes;
 143
 144         /* Create two lists, one for channel names, one for keys
 145          */
 146         irc::commasepstream items1(parameters[splithere]);
 147         irc::commasepstream items2(parameters[extra]);
 148         std::string item = "*";
 149         unsigned int max = 0;
 150
 151         /* Attempt to iterate these lists and call the command objech
 152          * which called us, for every parameter pair until there are
 153          * no more left to parse.
 154          */
 155         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 156         {
 157                 if (dupes.find(item.c_str()) == dupes.end())
 158                 {
 159                         const char* new_parameters[127];
 160
 161                         for (int t = 0; (t < pcnt) && (t < 127); t++)
 162                                 new_parameters[t] = parameters[t];
 163
 164                         std::string extrastuff = items2.GetToken();
 165
 166                         new_parameters[splithere] = item.c_str();
 167                         new_parameters[extra] = extrastuff.c_str();
 168
 169                         CommandObj->Handle(new_parameters,pcnt,user);
 170
 171                         dupes[item.c_str()] = true;
 172                 }
 173         }
 174         return 1;
 175 }
 176
 177 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 178 {
 179         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 180          * which called us just carries on as it was.
 181          */
 182         if (!strchr(parameters[splithere],','))
 183                 return 0;
 184
 185         std::map<irc::string, bool> dupes;
 186
 187         /* Only one commasepstream here */
 188         irc::commasepstream items1(parameters[splithere]);
 189         std::string item = "*";
 190         unsigned int max = 0;
 191
 192         /* Parse the commasepstream until there are no tokens remaining.
 193          * Each token we parse out, call the command handler that called us
 194          * with it
 195          */
 196         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 197         {
 198                 if (dupes.find(item.c_str()) == dupes.end())
 199                 {
 200                         const char* new_parameters[127];
 201
 202                         for (int t = 0; (t < pcnt) && (t < 127); t++)
 203                                 new_parameters[t] = parameters[t];
 204
 205                         new_parameters[splithere] = item.c_str();
 206
 207                         parameters[splithere] = item.c_str();
 208
 209                         /* Execute the command handler over and over. If someone pulls our user
 210                          * record out from under us (e.g. if we /kill a comma sep list, and we're
 211                          * in that list ourselves) abort if we're gone.
 212                          */
 213                         CommandObj->Handle(new_parameters,pcnt,user);
 214
 215                         dupes[item.c_str()] = true;
 216                 }
 217         }
 218         /* By returning 1 we tell our caller that nothing is to be done,
 219          * as all the previous calls handled the data. This makes the parent
 220          * return without doing any processing.
 221          */
 222         return 1;
 223 }
 224
 225 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 226 {
 227         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 228
 229         if (n != cmdlist.end())
 230         {
 231                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 232                 {
 233                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 234                         {
 235                                 if (n->second->flags_needed)
 236                                 {
 237                                         return ((user->HasPermission(commandname)) || (ServerInstance->ULine(user->server)));
 238                                 }
 239                                 return true;
 240                         }
 241                 }
 242         }
 243         return false;
 244 }
 245
 246 command_t* CommandParser::GetHandler(const std::string &commandname)
 247 {
 248         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 249         if (n != cmdlist.end())
 250                 return n->second;
 251
 252         return NULL;
 253 }
 254
 255 // calls a handler function for a command
 256
 257 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 258 {
 259         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 260
 261         if (n != cmdlist.end())
 262         {
 263                 if (pcnt >= n->second->min_params)
 264                 {
 265                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 266                         {
 267                                 if (n->second->flags_needed)
 268                                 {
 269                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 270                                         {
 271                                                 return n->second->Handle(parameters,pcnt,user);
 272                                         }
 273                                 }
 274                                 else
 275                                 {
 276                                         return n->second->Handle(parameters,pcnt,user);
 277                                 }
 278                         }
 279                 }
 280         }
 281         return CMD_INVALID;
 282 }
 283
 284 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 285 {
 286         const char *command_p[127];
 287         int items = 0;
 288         irc::tokenstream tokens(cmd);
 289         std::string command;
 290         tokens.GetToken(command);
 291
 292         /* A client sent a nick prefix on their command (ick)
 293          * rhapsody and some braindead bouncers do this --
 294          * the rfc says they shouldnt but also says the ircd should
 295          * discard it if they do.
 296          */
 297         if (*command.c_str() == ':')
 298                 tokens.GetToken(command);
 299
 300         while (tokens.GetToken(para[items]) && (items < 127))
 301         {
 302                 command_p[items] = para[items].c_str();
 303                 items++;
 304         }
 305
 306         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 307
 308         int MOD_RESULT = 0;
 309         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 310         if (MOD_RESULT == 1) {
 311                 return;
 312         }
 313
 314         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 315
 316         if (cm != cmdlist.end())
 317         {
 318                 if (user)
 319                 {
 320                         /* activity resets the ping pending timer */
 321                         user->nping = ServerInstance->Time() + user->pingmax;
 322                         if (cm->second->flags_needed)
 323                         {
 324                                 if (!user->IsModeSet(cm->second->flags_needed))
 325                                 {
 326                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privileges",user->nick);
 327                                         return;
 328                                 }
 329                                 if (!user->HasPermission(command))
 330                                 {
 331                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 332                                         return;
 333                                 }
 334                         }
 335                         if ((user->registered == REG_ALL) && (!*user->oper) && (cm->second->IsDisabled()))
 336                         {
 337                                 /* command is disabled! */
 338                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 339                                 return;
 340                         }
 341                         if (items < cm->second->min_params)
 342                         {
 343                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 344                                 /* If syntax is given, display this as the 461 reply */
 345                                 if ((ServerInstance->Config->SyntaxHints) && (user->registered == REG_ALL) && (cm->second->syntax.length()))
 346                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 347                                 return;
 348                         }
 349                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 350                         {
 351                                 /* ikky /stats counters */
 352                                 cm->second->use_count++;
 353                                 cm->second->total_bytes += cmd.length();
 354
 355                                 int MOD_RESULT = 0;
 356                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 357                                 if (MOD_RESULT == 1)
 358                                         return;
 359
 360                                 /*
 361                                  * WARNING: nothing may come after the
 362                                  * command handler call, as the handler
 363                                  * may free the user structure!
 364                                  */
 365                                 CmdResult result = cm->second->Handle(command_p,items,user);
 366
 367                                 FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 368                                 return;
 369                         }
 370                         else
 371                         {
 372                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 373                                 return;
 374                         }
 375                 }
 376         }
 377         else if (user)
 378         {
 379                 ServerInstance->stats->statsUnknown++;
 380                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 381         }
 382 }
 383
 384 bool CommandParser::RemoveCommands(const char* source)
 385 {
 386         nspace::hash_map<std::string,command_t*>::iterator i,safei;
 387         for (i = cmdlist.begin(); i != cmdlist.end(); i++)
 388         {
 389                 safei = i;
 390                 safei++;
 391                 if (safei != cmdlist.end())
 392                 {
 393                         RemoveCommand(safei, source);
 394                 }
 395         }
 396         safei = cmdlist.begin();
 397         if (safei != cmdlist.end())
 398         {
 399                 RemoveCommand(safei, source);
 400         }
 401         return true;
 402 }
 403
 404 void CommandParser::RemoveCommand(nspace::hash_map<std::string,command_t*>::iterator safei, const char* source)
 405 {
 406         command_t* x = safei->second;
 407         if (x->source == std::string(source))
 408         {
 409                 cmdlist.erase(safei);
 410         }
 411 }
 412
 413 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 414 {
 415         std::string::size_type a;
 416
 417         if (!user)
 418                 return;
 419
 420         while ((a = buffer.rfind("\n")) != std::string::npos)
 421                 buffer.erase(a);
 422         while ((a = buffer.rfind("\r")) != std::string::npos)
 423                 buffer.erase(a);
 424
 425         if (buffer.length())
 426         {
 427                 if (!user->muted)
 428                 {
 429                         ServerInstance->Log(DEBUG,"-> :%s %s",user->nick,buffer.c_str());
 430                         this->ProcessCommand(user,buffer);
 431                 }
 432         }
 433 }
 434
 435 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 436 {
 437         if (so_handle)
 438         {
 439                 if (RFCCommands.find(f->command) == RFCCommands.end())
 440                         RFCCommands[f->command] = so_handle;
 441                 else
 442                 {
 443                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 444                         return false;
 445                 }
 446         }
 447
 448         /* create the command and push it onto the table */
 449         if (cmdlist.find(f->command) == cmdlist.end())
 450         {
 451                 cmdlist[f->command] = f;
 452                 return true;
 453         }
 454         else return false;
 455 }
 456
 457 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 458 {
 459         para.resize(128);
 460         this->SetupCommandTable();
 461 }
 462
 463 bool CommandParser::FindSym(void** v, void* h)
 464 {
 465         *v = dlsym(h, "init_command");
 466         const char* err = dlerror();
 467         if (err)
 468         {
 469                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 470                 return false;
 471         }
 472         return true;
 473 }
 474
 475 bool CommandParser::ReloadCommand(const char* cmd)
 476 {
 477         char filename[MAXBUF];
 478         char commandname[MAXBUF];
 479         int y = 0;
 480
 481         for (const char* x = cmd; *x; x++, y++)
 482                 commandname[y] = toupper(*x);
 483
 484         commandname[y] = 0;
 485
 486         SharedObjectList::iterator command = RFCCommands.find(commandname);
 487
 488         if (command != RFCCommands.end())
 489         {
 490                 command_t* cmdptr = cmdlist.find(commandname)->second;
 491                 cmdlist.erase(cmdlist.find(commandname));
 492
 493                 for (char* x = commandname; *x; x++)
 494                         *x = tolower(*x);
 495
 496
 497                 delete cmdptr;
 498                 dlclose(command->second);
 499                 RFCCommands.erase(command);
 500
 501                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 502                 this->LoadCommand(filename);
 503
 504                 return true;
 505         }
 506
 507         return false;
 508 }
 509
 510 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 511 {
 512         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 513         if (ServerInstance->Parser->ReloadCommand(parameters[0]))
 514         {
 515                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 516                 ServerInstance->WriteOpers("*** RELOAD: %s reloaded the '%s' command.", user->nick, parameters[0]);
 517                 return CMD_SUCCESS;
 518         }
 519         else
 520         {
 521                 user->WriteServ("NOTICE %s :*** Could not reload command '%s'", user->nick, parameters[0]);
 522                 return CMD_FAILURE;
 523         }
 524 }
 525
 526 void CommandParser::LoadCommand(const char* name)
 527 {
 528         char filename[MAXBUF];
 529         void* h;
 530         command_t* (*cmd_factory_func)(InspIRCd*);
 531
 532         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 533         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 534
 535         if (!h)
 536         {
 537                 ServerInstance->Log(SPARSE, "Error loading core command: %s", dlerror());
 538                 return;
 539         }
 540
 541         if (this->FindSym((void **)&cmd_factory_func, h))
 542         {
 543                 command_t* newcommand = cmd_factory_func(ServerInstance);
 544                 this->CreateCommand(newcommand, h);
 545         }
 546 }
 547
 548 void CommandParser::SetupCommandTable()
 549 {
 550         RFCCommands.clear();
 551
 552         DIR* library = opendir(LIBRARYDIR);
 553         if (library)
 554         {
 555                 dirent* entry = NULL;
 556                 while ((entry = readdir(library)))
 557                 {
 558                         if (match(entry->d_name, "cmd_*.so"))
 559                         {
 560                                 this->LoadCommand(entry->d_name);
 561                         }
 562                 }
 563                 closedir(library);
 564         }
 565
 566         this->CreateCommand(new cmd_reload(ServerInstance));
 567 }
 568