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 long InspIRCd::Duration(const char* str)
  66 {
  67         char n_field[MAXBUF];
  68         long total = 0;
  69         n_field[0] = 0;
  70
  71         if ((!strchr(str,'s')) && (!strchr(str,'m')) && (!strchr(str,'h')) && (!strchr(str,'d')) && (!strchr(str,'w')) && (!strchr(str,'y')))
  72         {
  73                 std::string n = str;
  74                 n += 's';
  75                 return Duration(n.c_str());
  76         }
  77
  78         for (char* i = (char*)str; *i; i++)
  79         {
  80                 // if we have digits, build up a string for the value in n_field,
  81                 // up to 10 digits in size.
  82                 if ((*i >= '0') && (*i <= '9'))
  83                 {
  84                         strlcat(n_field,i,10);
  85                 }
  86                 else
  87                 {
  88                         // we dont have a digit, check for numeric tokens
  89                         switch (tolower(*i))
  90                         {
  91                                 case 's':
  92                                         total += atoi(n_field);
  93                                 break;
  94
  95                                 case 'm':
  96                                         total += (atoi(n_field)*duration_m);
  97                                 break;
  98
  99                                 case 'h':
 100                                         total += (atoi(n_field)*duration_h);
 101                                 break;
 102
 103                                 case 'd':
 104                                         total += (atoi(n_field)*duration_d);
 105                                 break;
 106
 107                                 case 'w':
 108                                         total += (atoi(n_field)*duration_w);
 109                                 break;
 110
 111                                 case 'y':
 112                                         total += (atoi(n_field)*duration_y);
 113                                 break;
 114                         }
 115                         n_field[0] = 0;
 116                 }
 117         }
 118         // add trailing seconds
 119         total += atoi(n_field);
 120
 121         return total;
 122 }
 123
 124 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
 125  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
 126  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
 127  * the channel names and their keys as follows:
 128  * JOIN #chan1,#chan2,#chan3 key1,,key3
 129  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
 130  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
 131  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
 132  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
 133  */
 134 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
 135 {
 136         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 137          * which called us just carries on as it was.
 138          */
 139         if (!strchr(parameters[splithere],','))
 140                 return 0;
 141
 142         /** Some lame ircds will weed out dupes using some shitty O(n^2) algorithm.
 143          * By using std::map (thanks for the idea w00t) we can cut this down a ton.
 144          * ...VOOODOOOO!
 145          */
 146         std::map<irc::string, bool> dupes;
 147
 148         /* Create two lists, one for channel names, one for keys
 149          */
 150         irc::commasepstream items1(parameters[splithere]);
 151         irc::commasepstream items2(parameters[extra]);
 152         std::string item = "*";
 153         unsigned int max = 0;
 154
 155         /* Attempt to iterate these lists and call the command objech
 156          * which called us, for every parameter pair until there are
 157          * no more left to parse.
 158          */
 159         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 160         {
 161                 if (dupes.find(item.c_str()) == dupes.end())
 162                 {
 163                         const char* new_parameters[127];
 164
 165                         for (int t = 0; (t < pcnt) && (t < 127); t++)
 166                                 new_parameters[t] = parameters[t];
 167
 168                         std::string extrastuff = items2.GetToken();
 169
 170                         new_parameters[splithere] = item.c_str();
 171                         new_parameters[extra] = extrastuff.c_str();
 172
 173                         CommandObj->Handle(new_parameters,pcnt,user);
 174
 175                         dupes[item.c_str()] = true;
 176                 }
 177         }
 178         return 1;
 179 }
 180
 181 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 182 {
 183         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 184          * which called us just carries on as it was.
 185          */
 186         if (!strchr(parameters[splithere],','))
 187                 return 0;
 188
 189         std::map<irc::string, bool> dupes;
 190
 191         /* Only one commasepstream here */
 192         irc::commasepstream items1(parameters[splithere]);
 193         std::string item = "*";
 194         unsigned int max = 0;
 195
 196         /* Parse the commasepstream until there are no tokens remaining.
 197          * Each token we parse out, call the command handler that called us
 198          * with it
 199          */
 200         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 201         {
 202                 if (dupes.find(item.c_str()) == dupes.end())
 203                 {
 204                         const char* new_parameters[127];
 205
 206                         for (int t = 0; (t < pcnt) && (t < 127); t++)
 207                                 new_parameters[t] = parameters[t];
 208
 209                         new_parameters[splithere] = item.c_str();
 210
 211                         parameters[splithere] = item.c_str();
 212
 213                         /* Execute the command handler over and over. If someone pulls our user
 214                          * record out from under us (e.g. if we /kill a comma sep list, and we're
 215                          * in that list ourselves) abort if we're gone.
 216                          */
 217                         CommandObj->Handle(new_parameters,pcnt,user);
 218
 219                         dupes[item.c_str()] = true;
 220                 }
 221         }
 222         /* By returning 1 we tell our caller that nothing is to be done,
 223          * as all the previous calls handled the data. This makes the parent
 224          * return without doing any processing.
 225          */
 226         return 1;
 227 }
 228
 229 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 230 {
 231         command_table::iterator n = cmdlist.find(commandname);
 232
 233         if (n != cmdlist.end())
 234         {
 235                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 236                 {
 237                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 238                         {
 239                                 if (n->second->flags_needed)
 240                                 {
 241                                         return ((user->HasPermission(commandname)) || (ServerInstance->ULine(user->server)));
 242                                 }
 243                                 return true;
 244                         }
 245                 }
 246         }
 247         return false;
 248 }
 249
 250 command_t* CommandParser::GetHandler(const std::string &commandname)
 251 {
 252         command_table::iterator n = cmdlist.find(commandname);
 253         if (n != cmdlist.end())
 254                 return n->second;
 255
 256         return NULL;
 257 }
 258
 259 // calls a handler function for a command
 260
 261 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 262 {
 263         command_table::iterator n = cmdlist.find(commandname);
 264
 265         if (n != cmdlist.end())
 266         {
 267                 if (pcnt >= n->second->min_params)
 268                 {
 269                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 270                         {
 271                                 if (n->second->flags_needed)
 272                                 {
 273                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 274                                         {
 275                                                 return n->second->Handle(parameters,pcnt,user);
 276                                         }
 277                                 }
 278                                 else
 279                                 {
 280                                         return n->second->Handle(parameters,pcnt,user);
 281                                 }
 282                         }
 283                 }
 284         }
 285         return CMD_INVALID;
 286 }
 287
 288 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 289 {
 290         const char *command_p[127];
 291         int items = 0;
 292         irc::tokenstream tokens(cmd);
 293         std::string command;
 294         tokens.GetToken(command);
 295
 296         /* A client sent a nick prefix on their command (ick)
 297          * rhapsody and some braindead bouncers do this --
 298          * the rfc says they shouldnt but also says the ircd should
 299          * discard it if they do.
 300          */
 301         if (*command.c_str() == ':')
 302                 tokens.GetToken(command);
 303
 304         while (tokens.GetToken(para[items]) && (items < 127))
 305         {
 306                 command_p[items] = para[items].c_str();
 307                 items++;
 308         }
 309
 310         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 311
 312         int MOD_RESULT = 0;
 313         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 314         if (MOD_RESULT == 1) {
 315                 return;
 316         }
 317
 318         command_table::iterator cm = cmdlist.find(command);
 319
 320         if (cm != cmdlist.end())
 321         {
 322                 if (user)
 323                 {
 324                         /* activity resets the ping pending timer */
 325                         user->nping = ServerInstance->Time() + user->pingmax;
 326                         if (cm->second->flags_needed)
 327                         {
 328                                 if (!user->IsModeSet(cm->second->flags_needed))
 329                                 {
 330                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privileges",user->nick);
 331                                         return;
 332                                 }
 333                                 if (!user->HasPermission(command))
 334                                 {
 335                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 336                                         return;
 337                                 }
 338                         }
 339                         if ((user->registered == REG_ALL) && (!IS_OPER(user)) && (cm->second->IsDisabled()))
 340                         {
 341                                 /* command is disabled! */
 342                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 343                                 return;
 344                         }
 345                         if (items < cm->second->min_params)
 346                         {
 347                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 348                                 /* If syntax is given, display this as the 461 reply */
 349                                 if ((ServerInstance->Config->SyntaxHints) && (user->registered == REG_ALL) && (cm->second->syntax.length()))
 350                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 351                                 return;
 352                         }
 353                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 354                         {
 355                                 /* ikky /stats counters */
 356                                 cm->second->use_count++;
 357                                 cm->second->total_bytes += cmd.length();
 358
 359                                 int MOD_RESULT = 0;
 360                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 361                                 if (MOD_RESULT == 1)
 362                                         return;
 363
 364                                 /*
 365                                  * WARNING: nothing may come after the
 366                                  * command handler call, as the handler
 367                                  * may free the user structure!
 368                                  */
 369                                 CmdResult result = cm->second->Handle(command_p,items,user);
 370
 371                                 FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 372                                 return;
 373                         }
 374                         else
 375                         {
 376                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 377                                 return;
 378                         }
 379                 }
 380         }
 381         else if (user)
 382         {
 383                 ServerInstance->stats->statsUnknown++;
 384                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 385         }
 386 }
 387
 388 bool CommandParser::RemoveCommands(const char* source)
 389 {
 390         command_table::iterator i,safei;
 391         for (i = cmdlist.begin(); i != cmdlist.end(); i++)
 392         {
 393                 safei = i;
 394                 safei++;
 395                 if (safei != cmdlist.end())
 396                 {
 397                         RemoveCommand(safei, source);
 398                 }
 399         }
 400         safei = cmdlist.begin();
 401         if (safei != cmdlist.end())
 402         {
 403                 RemoveCommand(safei, source);
 404         }
 405         return true;
 406 }
 407
 408 void CommandParser::RemoveCommand(command_table::iterator safei, const char* source)
 409 {
 410         command_t* x = safei->second;
 411         if (x->source == std::string(source))
 412         {
 413                 cmdlist.erase(safei);
 414         }
 415 }
 416
 417 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 418 {
 419         std::string::size_type a;
 420
 421         if (!user)
 422                 return;
 423
 424         while ((a = buffer.rfind("\n")) != std::string::npos)
 425                 buffer.erase(a);
 426         while ((a = buffer.rfind("\r")) != std::string::npos)
 427                 buffer.erase(a);
 428
 429         if (buffer.length())
 430         {
 431                 if (!user->muted)
 432                 {
 433                         ServerInstance->Log(DEBUG,"C[%d] -> :%s %s",user->GetFd(), user->nick, buffer.c_str());
 434                         this->ProcessCommand(user,buffer);
 435                 }
 436         }
 437 }
 438
 439 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 440 {
 441         if (so_handle)
 442         {
 443                 if (RFCCommands.find(f->command) == RFCCommands.end())
 444                         RFCCommands[f->command] = so_handle;
 445                 else
 446                 {
 447                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 448                         return false;
 449                 }
 450         }
 451
 452         /* create the command and push it onto the table */
 453         if (cmdlist.find(f->command) == cmdlist.end())
 454         {
 455                 cmdlist[f->command] = f;
 456                 return true;
 457         }
 458         else return false;
 459 }
 460
 461 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 462 {
 463         para.resize(128);
 464         this->SetupCommandTable();
 465 }
 466
 467 bool CommandParser::FindSym(void** v, void* h)
 468 {
 469         *v = dlsym(h, "init_command");
 470         const char* err = dlerror();
 471         if (err && !(*v))
 472         {
 473                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 474                 return false;
 475         }
 476         return true;
 477 }
 478
 479 bool CommandParser::ReloadCommand(const char* cmd)
 480 {
 481         char filename[MAXBUF];
 482         char commandname[MAXBUF];
 483         int y = 0;
 484
 485         for (const char* x = cmd; *x; x++, y++)
 486                 commandname[y] = toupper(*x);
 487
 488         commandname[y] = 0;
 489
 490         SharedObjectList::iterator command = RFCCommands.find(commandname);
 491
 492         if (command != RFCCommands.end())
 493         {
 494                 command_t* cmdptr = cmdlist.find(commandname)->second;
 495                 cmdlist.erase(cmdlist.find(commandname));
 496
 497                 for (char* x = commandname; *x; x++)
 498                         *x = tolower(*x);
 499
 500
 501                 delete cmdptr;
 502                 dlclose(command->second);
 503                 RFCCommands.erase(command);
 504
 505                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 506                 this->LoadCommand(filename);
 507
 508                 return true;
 509         }
 510
 511         return false;
 512 }
 513
 514 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 515 {
 516         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 517         if (ServerInstance->Parser->ReloadCommand(parameters[0]))
 518         {
 519                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 520                 ServerInstance->WriteOpers("*** RELOAD: %s reloaded the '%s' command.", user->nick, parameters[0]);
 521                 return CMD_SUCCESS;
 522         }
 523         else
 524         {
 525                 user->WriteServ("NOTICE %s :*** Could not reload command '%s'", user->nick, parameters[0]);
 526                 return CMD_FAILURE;
 527         }
 528 }
 529
 530 void CommandParser::LoadCommand(const char* name)
 531 {
 532         char filename[MAXBUF];
 533         void* h;
 534         command_t* (*cmd_factory_func)(InspIRCd*);
 535
 536         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 537         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 538
 539         if (!h)
 540         {
 541                 ServerInstance->Log(SPARSE, "Error loading core command: %s", dlerror());
 542                 return;
 543         }
 544
 545         if (this->FindSym((void **)&cmd_factory_func, h))
 546         {
 547                 command_t* newcommand = cmd_factory_func(ServerInstance);
 548                 this->CreateCommand(newcommand, h);
 549         }
 550 }
 551
 552 void CommandParser::SetupCommandTable()
 553 {
 554         RFCCommands.clear();
 555
 556         printf("\nLoading core commands");
 557         fflush(stdout);
 558
 559         DIR* library = opendir(LIBRARYDIR);
 560         if (library)
 561         {
 562                 dirent* entry = NULL;
 563                 while ((entry = readdir(library)))
 564                 {
 565                         if (match(entry->d_name, "cmd_*.so"))
 566                         {
 567                                 printf(".");
 568                                 fflush(stdout);
 569                                 this->LoadCommand(entry->d_name);
 570                         }
 571                 }
 572                 closedir(library);
 573                 printf("\n");
 574         }
 575
 576         this->CreateCommand(new cmd_reload(ServerInstance));
 577 }
 578