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 long InspIRCd::Duration(const char* str)
  57 {
  58         char n_field[MAXBUF];
  59         long total = 0;
  60         n_field[0] = 0;
  61
  62         if ((!strchr(str,'s')) && (!strchr(str,'m')) && (!strchr(str,'h')) && (!strchr(str,'d')) && (!strchr(str,'w')) && (!strchr(str,'y')))
  63         {
  64                 std::string n = str;
  65                 n += 's';
  66                 return Duration(n.c_str());
  67         }
  68
  69         for (char* i = (char*)str; *i; i++)
  70         {
  71                 // if we have digits, build up a string for the value in n_field,
  72                 // up to 10 digits in size.
  73                 if ((*i >= '0') && (*i <= '9'))
  74                 {
  75                         strlcat(n_field,i,10);
  76                 }
  77                 else
  78                 {
  79                         // we dont have a digit, check for numeric tokens
  80                         switch (tolower(*i))
  81                         {
  82                                 case 's':
  83                                         total += atoi(n_field);
  84                                 break;
  85
  86                                 case 'm':
  87                                         total += (atoi(n_field)*duration_m);
  88                                 break;
  89
  90                                 case 'h':
  91                                         total += (atoi(n_field)*duration_h);
  92                                 break;
  93
  94                                 case 'd':
  95                                         total += (atoi(n_field)*duration_d);
  96                                 break;
  97
  98                                 case 'w':
  99                                         total += (atoi(n_field)*duration_w);
 100                                 break;
 101
 102                                 case 'y':
 103                                         total += (atoi(n_field)*duration_y);
 104                                 break;
 105                         }
 106                         n_field[0] = 0;
 107                 }
 108         }
 109         // add trailing seconds
 110         total += atoi(n_field);
 111
 112         return total;
 113 }
 114
 115 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
 116  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
 117  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
 118  * the channel names and their keys as follows:
 119  * JOIN #chan1,#chan2,#chan3 key1,,key3
 120  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
 121  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
 122  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
 123  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
 124  */
 125 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
 126 {
 127         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 128          * which called us just carries on as it was.
 129          */
 130         if (!strchr(parameters[splithere],','))
 131                 return 0;
 132
 133         /** Some lame ircds will weed out dupes using some shitty O(n^2) algorithm.
 134          * By using std::map (thanks for the idea w00t) we can cut this down a ton.
 135          * ...VOOODOOOO!
 136          */
 137         std::map<irc::string, bool> dupes;
 138
 139         /* Create two lists, one for channel names, one for keys
 140          */
 141         irc::commasepstream items1(parameters[splithere]);
 142         irc::commasepstream items2(parameters[extra]);
 143         std::string item = "*";
 144         unsigned int max = 0;
 145
 146         /* Attempt to iterate these lists and call the command objech
 147          * which called us, for every parameter pair until there are
 148          * no more left to parse.
 149          */
 150         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 151         {
 152                 if (dupes.find(item.c_str()) == dupes.end())
 153                 {
 154                         const char* new_parameters[127];
 155
 156                         for (int t = 0; (t < pcnt) && (t < 127); t++)
 157                                 new_parameters[t] = parameters[t];
 158
 159                         std::string extrastuff = items2.GetToken();
 160
 161                         new_parameters[splithere] = item.c_str();
 162                         new_parameters[extra] = extrastuff.c_str();
 163
 164                         CommandObj->Handle(new_parameters,pcnt,user);
 165
 166                         dupes[item.c_str()] = true;
 167                 }
 168         }
 169         return 1;
 170 }
 171
 172 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 173 {
 174         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 175          * which called us just carries on as it was.
 176          */
 177         if (!strchr(parameters[splithere],','))
 178                 return 0;
 179
 180         std::map<irc::string, bool> dupes;
 181
 182         /* Only one commasepstream here */
 183         irc::commasepstream items1(parameters[splithere]);
 184         std::string item = "*";
 185         unsigned int max = 0;
 186
 187         /* Parse the commasepstream until there are no tokens remaining.
 188          * Each token we parse out, call the command handler that called us
 189          * with it
 190          */
 191         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 192         {
 193                 if (dupes.find(item.c_str()) == dupes.end())
 194                 {
 195                         const char* new_parameters[127];
 196
 197                         for (int t = 0; (t < pcnt) && (t < 127); t++)
 198                                 new_parameters[t] = parameters[t];
 199
 200                         new_parameters[splithere] = item.c_str();
 201
 202                         parameters[splithere] = item.c_str();
 203
 204                         /* Execute the command handler over and over. If someone pulls our user
 205                          * record out from under us (e.g. if we /kill a comma sep list, and we're
 206                          * in that list ourselves) abort if we're gone.
 207                          */
 208                         CommandObj->Handle(new_parameters,pcnt,user);
 209
 210                         dupes[item.c_str()] = true;
 211                 }
 212         }
 213         /* By returning 1 we tell our caller that nothing is to be done,
 214          * as all the previous calls handled the data. This makes the parent
 215          * return without doing any processing.
 216          */
 217         return 1;
 218 }
 219
 220 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 221 {
 222         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 223
 224         if (n != cmdlist.end())
 225         {
 226                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 227                 {
 228                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 229                         {
 230                                 if (n->second->flags_needed)
 231                                 {
 232                                         return ((user->HasPermission(commandname)) || (ServerInstance->ULine(user->server)));
 233                                 }
 234                                 return true;
 235                         }
 236                 }
 237         }
 238         return false;
 239 }
 240
 241 command_t* CommandParser::GetHandler(const std::string &commandname)
 242 {
 243         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 244         if (n != cmdlist.end())
 245                 return n->second;
 246
 247         return NULL;
 248 }
 249
 250 // calls a handler function for a command
 251
 252 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 253 {
 254         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 255
 256         if (n != cmdlist.end())
 257         {
 258                 if (pcnt >= n->second->min_params)
 259                 {
 260                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 261                         {
 262                                 if (n->second->flags_needed)
 263                                 {
 264                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 265                                         {
 266                                                 return n->second->Handle(parameters,pcnt,user);
 267                                         }
 268                                 }
 269                                 else
 270                                 {
 271                                         return n->second->Handle(parameters,pcnt,user);
 272                                 }
 273                         }
 274                 }
 275         }
 276         return CMD_INVALID;
 277 }
 278
 279 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 280 {
 281         const char *command_p[127];
 282         int items = 0;
 283         irc::tokenstream tokens(cmd);
 284         std::string command;
 285         tokens.GetToken(command);
 286
 287         while (tokens.GetToken(para[items]) && (items < 127))
 288         {
 289                 command_p[items] = para[items].c_str();
 290                 items++;
 291         }
 292
 293         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 294
 295         int MOD_RESULT = 0;
 296         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 297         if (MOD_RESULT == 1) {
 298                 return;
 299         }
 300
 301         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 302
 303         if (cm != cmdlist.end())
 304         {
 305                 if (user)
 306                 {
 307                         /* activity resets the ping pending timer */
 308                         user->nping = ServerInstance->Time() + user->pingmax;
 309                         if (cm->second->flags_needed)
 310                         {
 311                                 if (!user->IsModeSet(cm->second->flags_needed))
 312                                 {
 313                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privileges",user->nick);
 314                                         return;
 315                                 }
 316                                 if (!user->HasPermission(command))
 317                                 {
 318                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 319                                         return;
 320                                 }
 321                         }
 322                         if ((user->registered == REG_ALL) && (!*user->oper) && (cm->second->IsDisabled()))
 323                         {
 324                                 /* command is disabled! */
 325                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 326                                 return;
 327                         }
 328                         if (items < cm->second->min_params)
 329                         {
 330                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 331                                 /* If syntax is given, display this as the 461 reply */
 332                                 if ((ServerInstance->Config->SyntaxHints) && (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 may come after the
 349                                  * command handler call, as the handler
 350                                  * may free the user structure!
 351                                  */
 352                                 CmdResult result = cm->second->Handle(command_p,items,user);
 353
 354                                 FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 355                                 return;
 356                         }
 357                         else
 358                         {
 359                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 360                                 return;
 361                         }
 362                 }
 363         }
 364         else if (user)
 365         {
 366                 ServerInstance->stats->statsUnknown++;
 367                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 368         }
 369 }
 370
 371 bool CommandParser::RemoveCommands(const char* source)
 372 {
 373         nspace::hash_map<std::string,command_t*>::iterator i,safei;
 374         for (i = cmdlist.begin(); i != cmdlist.end(); i++)
 375         {
 376                 safei = i;
 377                 safei++;
 378                 if (safei != cmdlist.end())
 379                 {
 380                         RemoveCommand(safei, source);
 381                 }
 382         }
 383         safei = cmdlist.begin();
 384         if (safei != cmdlist.end())
 385         {
 386                 RemoveCommand(safei, source);
 387         }
 388         return true;
 389 }
 390
 391 void CommandParser::RemoveCommand(nspace::hash_map<std::string,command_t*>::iterator safei, const char* source)
 392 {
 393         command_t* x = safei->second;
 394         if (x->source == std::string(source))
 395         {
 396                 cmdlist.erase(safei);
 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,"-> :%s %s",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)
 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         DIR* library = opendir(LIBRARYDIR);
 540         if (library)
 541         {
 542                 dirent* entry = NULL;
 543                 while ((entry = readdir(library)))
 544                 {
 545                         if (match(entry->d_name, "cmd_*.so"))
 546                         {
 547                                 this->LoadCommand(entry->d_name);
 548                         }
 549                 }
 550                 closedir(library);
 551         }
 552
 553         this->CreateCommand(new cmd_reload(ServerInstance));
 554 }
 555