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         Log(DEBUG,"OperPassCompare: %d",MOD_RESULT);
  42         if (MOD_RESULT == 1)
  43                 return 0;
  44         if (MOD_RESULT == -1)
  45                 return 1;
  46         Log(DEBUG,"strcmp fallback: '%s' '%s' %d",data,input,strcmp(data,input));
  47         return strcmp(data,input);
  48 }
  49
  50 long InspIRCd::Duration(const char* str)
  51 {
  52         char n_field[MAXBUF];
  53         long total = 0;
  54         n_field[0] = 0;
  55
  56         if ((!strchr(str,'s')) && (!strchr(str,'m')) && (!strchr(str,'h')) && (!strchr(str,'d')) && (!strchr(str,'w')) && (!strchr(str,'y')))
  57         {
  58                 std::string n = str;
  59                 n += 's';
  60                 return Duration(n.c_str());
  61         }
  62
  63         for (char* i = (char*)str; *i; i++)
  64         {
  65                 // if we have digits, build up a string for the value in n_field,
  66                 // up to 10 digits in size.
  67                 if ((*i >= '0') && (*i <= '9'))
  68                 {
  69                         strlcat(n_field,i,10);
  70                 }
  71                 else
  72                 {
  73                         // we dont have a digit, check for numeric tokens
  74                         switch (tolower(*i))
  75                         {
  76                                 case 's':
  77                                         total += atoi(n_field);
  78                                 break;
  79
  80                                 case 'm':
  81                                         total += (atoi(n_field)*duration_m);
  82                                 break;
  83
  84                                 case 'h':
  85                                         total += (atoi(n_field)*duration_h);
  86                                 break;
  87
  88                                 case 'd':
  89                                         total += (atoi(n_field)*duration_d);
  90                                 break;
  91
  92                                 case 'w':
  93                                         total += (atoi(n_field)*duration_w);
  94                                 break;
  95
  96                                 case 'y':
  97                                         total += (atoi(n_field)*duration_y);
  98                                 break;
  99                         }
 100                         n_field[0] = 0;
 101                 }
 102         }
 103         // add trailing seconds
 104         total += atoi(n_field);
 105
 106         return total;
 107 }
 108
 109 /* All other ircds when doing this check usually just look for a string of *@* or *. We're smarter than that, though. */
 110
 111 bool InspIRCd::HostMatchesEveryone(const std::string &mask, userrec* user)
 112 {
 113         char buffer[MAXBUF];
 114         char itrigger[MAXBUF];
 115         long matches = 0;
 116
 117         if (!Config->ConfValue(Config->config_data, "insane","trigger", 0, itrigger, MAXBUF))
 118                 strlcpy(itrigger,"95.5",MAXBUF);
 119
 120         if (Config->ConfValueBool(Config->config_data, "insane","hostmasks", 0))
 121                 return false;
 122
 123         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 124         {
 125                 strlcpy(buffer,u->second->ident,MAXBUF);
 126                 charlcat(buffer,'@',MAXBUF);
 127                 strlcat(buffer,u->second->host,MAXBUF);
 128                 if (match(buffer,mask.c_str()))
 129                         matches++;
 130         }
 131         float percent = ((float)matches / (float)clientlist.size()) * 100;
 132         if (percent > (float)atof(itrigger))
 133         {
 134                 WriteOpers("*** \2WARNING\2: %s tried to set a G/K/E line mask of %s, which covers %.2f%% of the network!",user->nick,mask.c_str(),percent);
 135                 return true;
 136         }
 137         return false;
 138 }
 139
 140 bool InspIRCd::IPMatchesEveryone(const std::string &ip, userrec* user)
 141 {
 142         char itrigger[MAXBUF];
 143         long matches = 0;
 144
 145         if (!Config->ConfValue(Config->config_data, "insane","trigger",0,itrigger,MAXBUF))
 146                 strlcpy(itrigger,"95.5",MAXBUF);
 147
 148         if (Config->ConfValueBool(Config->config_data, "insane","ipmasks",0))
 149                 return false;
 150
 151         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 152         {
 153                 if (match(u->second->GetIPString(),ip.c_str(),true))
 154                         matches++;
 155         }
 156
 157         float percent = ((float)matches / (float)clientlist.size()) * 100;
 158         if (percent > (float)atof(itrigger))
 159         {
 160                 WriteOpers("*** \2WARNING\2: %s tried to set a Z line mask of %s, which covers %.2f%% of the network!",user->nick,ip.c_str(),percent);
 161                 return true;
 162         }
 163         return false;
 164 }
 165
 166 bool InspIRCd::NickMatchesEveryone(const std::string &nick, userrec* user)
 167 {
 168         char itrigger[MAXBUF];
 169         long matches = 0;
 170
 171         if (!Config->ConfValue(Config->config_data, "insane","trigger",0,itrigger,MAXBUF))
 172                 strlcpy(itrigger,"95.5",MAXBUF);
 173
 174         if (Config->ConfValueBool(Config->config_data, "insane","nickmasks",0))
 175                 return false;
 176
 177         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 178         {
 179                 if (match(u->second->nick,nick.c_str()))
 180                         matches++;
 181         }
 182
 183         float percent = ((float)matches / (float)clientlist.size()) * 100;
 184         if (percent > (float)atof(itrigger))
 185         {
 186                 WriteOpers("*** \2WARNING\2: %s tried to set a Q line mask of %s, which covers %.2f%% of the network!",user->nick,nick.c_str(),percent);
 187                 return true;
 188         }
 189         return false;
 190 }
 191
 192 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
 193  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
 194  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
 195  * the channel names and their keys as follows:
 196  * JOIN #chan1,#chan2,#chan3 key1,,key3
 197  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
 198  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
 199  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
 200  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
 201  */
 202 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
 203 {
 204         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 205          * which called us just carries on as it was.
 206          */
 207         if (!strchr(parameters[splithere],','))
 208                 return 0;
 209
 210         /** Some lame ircds will weed out dupes using some shitty O(n^2) algorithm.
 211          * By using std::map (thanks for the idea w00t) we can cut this down a ton.
 212          * ...VOOODOOOO!
 213          */
 214         std::map<irc::string, bool> dupes;
 215
 216         /* Create two lists, one for channel names, one for keys
 217          */
 218         irc::commasepstream items1(parameters[splithere]);
 219         irc::commasepstream items2(parameters[extra]);
 220         std::string item = "*";
 221         unsigned int max = 0;
 222
 223         /* Attempt to iterate these lists and call the command objech
 224          * which called us, for every parameter pair until there are
 225          * no more left to parse.
 226          */
 227         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 228         {
 229                 if (dupes.find(item.c_str()) == dupes.end())
 230                 {
 231                         const char* new_parameters[127];
 232
 233                         for (int t = 0; (t < pcnt) && (t < 127); t++)
 234                                 new_parameters[t] = parameters[t];
 235
 236                         std::string extrastuff = items2.GetToken();
 237
 238                         new_parameters[splithere] = item.c_str();
 239                         new_parameters[extra] = extrastuff.c_str();
 240
 241                         if (CommandObj->Handle(new_parameters,pcnt,user) == CMD_USER_DELETED)
 242                                 return 1;
 243
 244                         dupes[item.c_str()] = true;
 245                 }
 246         }
 247         return 1;
 248 }
 249
 250 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 251 {
 252         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 253          * which called us just carries on as it was.
 254          */
 255         if (!strchr(parameters[splithere],','))
 256                 return 0;
 257
 258         std::map<irc::string, bool> dupes;
 259
 260         /* Only one commasepstream here */
 261         ServerInstance->Log(DEBUG,"Splitting '%s'",parameters[splithere]);
 262         irc::commasepstream items1(parameters[splithere]);
 263         std::string item = "*";
 264         unsigned int max = 0;
 265
 266         /* Parse the commasepstream until there are no tokens remaining.
 267          * Each token we parse out, call the command handler that called us
 268          * with it
 269          */
 270         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 271         {
 272                 if (dupes.find(item.c_str()) == dupes.end())
 273                 {
 274                         const char* new_parameters[127];
 275
 276                         for (int t = 0; (t < pcnt) && (t < 127); t++)
 277                                 new_parameters[t] = parameters[t];
 278
 279                         new_parameters[splithere] = item.c_str();
 280
 281                         parameters[splithere] = item.c_str();
 282
 283                         /* Execute the command handler over and over. If someone pulls our user
 284                          * record out from under us (e.g. if we /kill a comma sep list, and we're
 285                          * in that list ourselves) abort if we're gone.
 286                          */
 287                         if (CommandObj->Handle(new_parameters,pcnt,user) == CMD_USER_DELETED)
 288                                 return 1;
 289
 290                         dupes[item.c_str()] = true;
 291                 }
 292         }
 293         /* By returning 1 we tell our caller that nothing is to be done,
 294          * as all the previous calls handled the data. This makes the parent
 295          * return without doing any processing.
 296          */
 297         return 1;
 298 }
 299
 300 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 301 {
 302         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 303
 304         if (n != cmdlist.end())
 305         {
 306                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 307                 {
 308                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 309                         {
 310                                 if (n->second->flags_needed)
 311                                 {
 312                                         return ((user->HasPermission(commandname)) || (ServerInstance->ULine(user->server)));
 313                                 }
 314                                 return true;
 315                         }
 316                 }
 317         }
 318         return false;
 319 }
 320
 321 command_t* CommandParser::GetHandler(const std::string &commandname)
 322 {
 323         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 324         if (n != cmdlist.end())
 325                 return n->second;
 326
 327         return NULL;
 328 }
 329
 330 // calls a handler function for a command
 331
 332 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 333 {
 334         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 335
 336         if (n != cmdlist.end())
 337         {
 338                 if (pcnt >= n->second->min_params)
 339                 {
 340                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 341                         {
 342                                 if (n->second->flags_needed)
 343                                 {
 344                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 345                                         {
 346                                                 return n->second->Handle(parameters,pcnt,user);
 347                                         }
 348                                 }
 349                                 else
 350                                 {
 351                                         return n->second->Handle(parameters,pcnt,user);
 352                                 }
 353                         }
 354                 }
 355         }
 356         return CMD_INVALID;
 357 }
 358
 359 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 360 {
 361         const char *command_p[127];
 362         int items = 0;
 363         irc::tokenstream tokens(cmd);
 364         std::string command = tokens.GetToken();
 365
 366         while (((para[items] = tokens.GetToken()) != "") && (items < 127))
 367         {
 368                 command_p[items] = para[items].c_str();
 369                 items++;
 370         }
 371
 372         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 373
 374         int MOD_RESULT = 0;
 375         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 376         if (MOD_RESULT == 1) {
 377                 return;
 378         }
 379
 380         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 381
 382         if (cm != cmdlist.end())
 383         {
 384                 if (user)
 385                 {
 386                         /* activity resets the ping pending timer */
 387                         user->nping = ServerInstance->Time() + user->pingmax;
 388                         if (cm->second->flags_needed)
 389                         {
 390                                 if (!user->IsModeSet(cm->second->flags_needed))
 391                                 {
 392                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privileges",user->nick);
 393                                         return;
 394                                 }
 395                                 if (!user->HasPermission(command))
 396                                 {
 397                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 398                                         return;
 399                                 }
 400                         }
 401                         if ((user->registered == REG_ALL) && (!*user->oper) && (cm->second->IsDisabled()))
 402                         {
 403                                 /* command is disabled! */
 404                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 405                                 return;
 406                         }
 407                         if (items < cm->second->min_params)
 408                         {
 409                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 410                                 /* If syntax is given, display this as the 461 reply */
 411                                 if ((ServerInstance->Config->SyntaxHints) && (cm->second->syntax.length()))
 412                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 413                                 return;
 414                         }
 415                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 416                         {
 417                                 /* ikky /stats counters */
 418                                 cm->second->use_count++;
 419                                 cm->second->total_bytes += cmd.length();
 420
 421                                 int MOD_RESULT = 0;
 422                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 423                                 if (MOD_RESULT == 1)
 424                                         return;
 425
 426                                 /*
 427                                  * WARNING: nothing may come after the
 428                                  * command handler call, as the handler
 429                                  * may free the user structure!
 430                                  */
 431                                 CmdResult result = cm->second->Handle(command_p,items,user);
 432
 433                                 if (result != CMD_USER_DELETED)
 434                                 {
 435                                         FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 436                                 }
 437                                 return;
 438                         }
 439                         else
 440                         {
 441                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 442                                 return;
 443                         }
 444                 }
 445         }
 446         else if (user)
 447         {
 448                 ServerInstance->stats->statsUnknown++;
 449                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 450         }
 451 }
 452
 453 bool CommandParser::RemoveCommands(const char* source)
 454 {
 455         bool go_again = true;
 456
 457         while (go_again)
 458         {
 459                 go_again = false;
 460
 461                 for (nspace::hash_map<std::string,command_t*>::iterator i = cmdlist.begin(); i != cmdlist.end(); i++)
 462                 {
 463                         command_t* x = i->second;
 464                         if (x->source == std::string(source))
 465                         {
 466                                 ServerInstance->Log(DEBUG,"removecommands(%s) Removing dependent command: %s",x->source.c_str(),x->command.c_str());
 467                                 cmdlist.erase(i);
 468                                 go_again = true;
 469                                 break;
 470                         }
 471                 }
 472         }
 473
 474         return true;
 475 }
 476
 477 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 478 {
 479         std::string::size_type a;
 480
 481         if (!user)
 482                 return;
 483
 484         while ((a = buffer.rfind("\n")) != std::string::npos)
 485                 buffer.erase(a);
 486         while ((a = buffer.rfind("\r")) != std::string::npos)
 487                 buffer.erase(a);
 488
 489         if (buffer.length())
 490         {
 491                 ServerInstance->Log(DEBUG,"CMDIN: %s %s",user->nick,buffer.c_str());
 492                 this->ProcessCommand(user,buffer);
 493         }
 494 }
 495
 496 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 497 {
 498         if (so_handle)
 499         {
 500                 if (RFCCommands.find(f->command) == RFCCommands.end())
 501                 {
 502                         RFCCommands[f->command] = so_handle;
 503                         ServerInstance->Log(DEFAULT,"Monitoring RFC-specified reloadable command at %8x",so_handle);
 504                 }
 505                 else
 506                 {
 507                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 508                         return false;
 509                 }
 510         }
 511
 512         /* create the command and push it onto the table */
 513         if (cmdlist.find(f->command) == cmdlist.end())
 514         {
 515                 cmdlist[f->command] = f;
 516                 ServerInstance->Log(DEBUG,"Added command %s (%lu parameters)",f->command.c_str(),(unsigned long)f->min_params);
 517                 return true;
 518         }
 519         else return false;
 520 }
 521
 522 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 523 {
 524         para.resize(128);
 525         this->SetupCommandTable();
 526 }
 527
 528 bool CommandParser::FindSym(void** v, void* h)
 529 {
 530         *v = dlsym(h, "init_command");
 531         const char* err = dlerror();
 532         if (err)
 533         {
 534                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 535                 return false;
 536         }
 537         return true;
 538 }
 539
 540 bool CommandParser::ReloadCommand(const char* cmd)
 541 {
 542         char filename[MAXBUF];
 543         char commandname[MAXBUF];
 544         int y = 0;
 545
 546         for (const char* x = cmd; *x; x++, y++)
 547                 commandname[y] = toupper(*x);
 548
 549         commandname[y] = 0;
 550
 551         SharedObjectList::iterator command = RFCCommands.find(commandname);
 552
 553         if (command != RFCCommands.end())
 554         {
 555                 command_t* cmdptr = cmdlist.find(commandname)->second;
 556                 cmdlist.erase(cmdlist.find(commandname));
 557
 558                 for (char* x = commandname; *x; x++)
 559                         *x = tolower(*x);
 560
 561
 562                 delete cmdptr;
 563                 dlclose(command->second);
 564                 RFCCommands.erase(command);
 565
 566                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 567                 this->LoadCommand(filename);
 568
 569                 return true;
 570         }
 571
 572         return false;
 573 }
 574
 575 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 576 {
 577         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 578         if (ServerInstance->Parser->ReloadCommand(parameters[0]))
 579         {
 580                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 581                 ServerInstance->WriteOpers("*** RELOAD: %s reloaded the '%s' command.", user->nick, parameters[0]);
 582                 return CMD_SUCCESS;
 583         }
 584         else
 585         {
 586                 user->WriteServ("NOTICE %s :*** Could not reload command '%s'", user->nick, parameters[0]);
 587                 return CMD_FAILURE;
 588         }
 589 }
 590
 591 void CommandParser::LoadCommand(const char* name)
 592 {
 593         char filename[MAXBUF];
 594         void* h;
 595         command_t* (*cmd_factory_func)(InspIRCd*);
 596
 597         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 598         ServerInstance->Log(DEBUG,"Load command: %s", filename);
 599
 600         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 601
 602         if (!h)
 603         {
 604                 ServerInstance->Log(SPARSE, "Error loading core command: %s", dlerror());
 605                 return;
 606         }
 607
 608         if (this->FindSym((void **)&cmd_factory_func, h))
 609         {
 610                 command_t* newcommand = cmd_factory_func(ServerInstance);
 611                 this->CreateCommand(newcommand, h);
 612         }
 613 }
 614
 615 void CommandParser::SetupCommandTable()
 616 {
 617         RFCCommands.clear();
 618
 619         DIR* library = opendir(LIBRARYDIR);
 620         if (library)
 621         {
 622                 dirent* entry = NULL;
 623                 while ((entry = readdir(library)))
 624                 {
 625                         if (match(entry->d_name, "cmd_*.so"))
 626                         {
 627                                 this->LoadCommand(entry->d_name);
 628                         }
 629                 }
 630                 closedir(library);
 631         }
 632
 633         this->CreateCommand(new cmd_reload(ServerInstance));
 634 }
 635