src/command_parse.cpp

   1 /*       +------------------------------------+
   2  *       | Inspire Internet Relay Chat Daemon |
   3  *       +------------------------------------+
   4  *
   5  *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
   6  *                       E-mail:
   7  *                <brain@chatspike.net>
   8  *                <Craig@chatspike.net>
   9  *
  10  * Written by Craig Edwards, Craig McLure, and others.
  11  * This program is free but copyrighted software; see
  12  *            the file COPYING for details.
  13  *
  14  * ---------------------------------------------------
  15  */
  16
  17 #include "inspircd.h"
  18 #include "configreader.h"
  19 #include <algorithm>
  20 #include <dirent.h>
  21 #include <dlfcn.h>
  22 #include "users.h"
  23 #include "modules.h"
  24 #include "wildcard.h"
  25 #include "xline.h"
  26 #include "socketengine.h"
  27 #include "socket.h"
  28 #include "command_parse.h"
  29
  30 bool InspIRCd::ULine(const char* server)
  31 {
  32         if (!server)
  33                 return false;
  34         if (!*server)
  35                 return true;
  36
  37         return (find(Config->ulines.begin(),Config->ulines.end(),server) != Config->ulines.end());
  38 }
  39
  40 int InspIRCd::OperPassCompare(const char* data,const char* input)
  41 {
  42         int MOD_RESULT = 0;
  43         FOREACH_RESULT_I(this,I_OnOperCompare,OnOperCompare(data,input))
  44         Log(DEBUG,"OperPassCompare: %d",MOD_RESULT);
  45         if (MOD_RESULT == 1)
  46                 return 0;
  47         if (MOD_RESULT == -1)
  48                 return 1;
  49         Log(DEBUG,"strcmp fallback: '%s' '%s' %d",data,input,strcmp(data,input));
  50         return strcmp(data,input);
  51 }
  52
  53 long InspIRCd::Duration(const char* str)
  54 {
  55         char n_field[MAXBUF];
  56         long total = 0;
  57         n_field[0] = 0;
  58
  59         if ((!strchr(str,'s')) && (!strchr(str,'m')) && (!strchr(str,'h')) && (!strchr(str,'d')) && (!strchr(str,'w')) && (!strchr(str,'y')))
  60         {
  61                 std::string n = str;
  62                 n += 's';
  63                 return Duration(n.c_str());
  64         }
  65
  66         for (char* i = (char*)str; *i; i++)
  67         {
  68                 // if we have digits, build up a string for the value in n_field,
  69                 // up to 10 digits in size.
  70                 if ((*i >= '0') && (*i <= '9'))
  71                 {
  72                         strlcat(n_field,i,10);
  73                 }
  74                 else
  75                 {
  76                         // we dont have a digit, check for numeric tokens
  77                         switch (tolower(*i))
  78                         {
  79                                 case 's':
  80                                         total += atoi(n_field);
  81                                 break;
  82
  83                                 case 'm':
  84                                         total += (atoi(n_field)*duration_m);
  85                                 break;
  86
  87                                 case 'h':
  88                                         total += (atoi(n_field)*duration_h);
  89                                 break;
  90
  91                                 case 'd':
  92                                         total += (atoi(n_field)*duration_d);
  93                                 break;
  94
  95                                 case 'w':
  96                                         total += (atoi(n_field)*duration_w);
  97                                 break;
  98
  99                                 case 'y':
 100                                         total += (atoi(n_field)*duration_y);
 101                                 break;
 102                         }
 103                         n_field[0] = 0;
 104                 }
 105         }
 106         // add trailing seconds
 107         total += atoi(n_field);
 108
 109         return total;
 110 }
 111
 112 /* All other ircds when doing this check usually just look for a string of *@* or *. We're smarter than that, though. */
 113
 114 bool InspIRCd::HostMatchesEveryone(const std::string &mask, userrec* user)
 115 {
 116         char buffer[MAXBUF];
 117         char itrigger[MAXBUF];
 118         long matches = 0;
 119
 120         if (!Config->ConfValue(Config->config_data, "insane","trigger", 0, itrigger, MAXBUF))
 121                 strlcpy(itrigger,"95.5",MAXBUF);
 122
 123         if (Config->ConfValueBool(Config->config_data, "insane","hostmasks", 0))
 124                 return false;
 125
 126         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 127         {
 128                 strlcpy(buffer,u->second->ident,MAXBUF);
 129                 charlcat(buffer,'@',MAXBUF);
 130                 strlcat(buffer,u->second->host,MAXBUF);
 131                 if (match(buffer,mask.c_str()))
 132                         matches++;
 133         }
 134         float percent = ((float)matches / (float)clientlist.size()) * 100;
 135         if (percent > (float)atof(itrigger))
 136         {
 137                 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);
 138                 return true;
 139         }
 140         return false;
 141 }
 142
 143 bool InspIRCd::IPMatchesEveryone(const std::string &ip, userrec* user)
 144 {
 145         char itrigger[MAXBUF];
 146         long matches = 0;
 147
 148         if (!Config->ConfValue(Config->config_data, "insane","trigger",0,itrigger,MAXBUF))
 149                 strlcpy(itrigger,"95.5",MAXBUF);
 150
 151         if (Config->ConfValueBool(Config->config_data, "insane","ipmasks",0))
 152                 return false;
 153
 154         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 155         {
 156                 if (match(u->second->GetIPString(),ip.c_str(),true))
 157                         matches++;
 158         }
 159
 160         float percent = ((float)matches / (float)clientlist.size()) * 100;
 161         if (percent > (float)atof(itrigger))
 162         {
 163                 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);
 164                 return true;
 165         }
 166         return false;
 167 }
 168
 169 bool InspIRCd::NickMatchesEveryone(const std::string &nick, userrec* user)
 170 {
 171         char itrigger[MAXBUF];
 172         long matches = 0;
 173
 174         if (!Config->ConfValue(Config->config_data, "insane","trigger",0,itrigger,MAXBUF))
 175                 strlcpy(itrigger,"95.5",MAXBUF);
 176
 177         if (Config->ConfValueBool(Config->config_data, "insane","nickmasks",0))
 178                 return false;
 179
 180         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 181         {
 182                 if (match(u->second->nick,nick.c_str()))
 183                         matches++;
 184         }
 185
 186         float percent = ((float)matches / (float)clientlist.size()) * 100;
 187         if (percent > (float)atof(itrigger))
 188         {
 189                 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);
 190                 return true;
 191         }
 192         return false;
 193 }
 194
 195 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
 196  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
 197  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
 198  * the channel names and their keys as follows:
 199  * JOIN #chan1,#chan2,#chan3 key1,,key3
 200  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
 201  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
 202  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
 203  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
 204  */
 205 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
 206 {
 207         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 208          * which called us just carries on as it was.
 209          */
 210         if (!strchr(parameters[splithere],','))
 211                 return 0;
 212
 213         /* Create two lists, one for channel names, one for keys
 214          */
 215         irc::commasepstream items1(parameters[splithere]);
 216         irc::commasepstream items2(parameters[extra]);
 217         std::string item = "";
 218         unsigned int max = 0;
 219
 220         /* Attempt to iterate these lists and call the command objech
 221          * which called us, for every parameter pair until there are
 222          * no more left to parse.
 223          */
 224         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 225         {
 226                 std::string extrastuff = items2.GetToken();
 227                 parameters[splithere] = item.c_str();
 228                 parameters[extra] = extrastuff.c_str();
 229                 CommandObj->Handle(parameters,pcnt,user);
 230         }
 231         return 1;
 232 }
 233
 234 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 235 {
 236         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 237          * which called us just carries on as it was.
 238          */
 239         if (!strchr(parameters[splithere],','))
 240                 return 0;
 241
 242         /* Only one commasepstream here */
 243         irc::commasepstream items1(parameters[splithere]);
 244         std::string item = "";
 245         unsigned int max = 0;
 246
 247         /* Parse the commasepstream until there are no tokens remaining.
 248          * Each token we parse out, call the command handler that called us
 249          * with it
 250          */
 251         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 252         {
 253                 parameters[splithere] = item.c_str();
 254                 CommandObj->Handle(parameters,pcnt,user);
 255         }
 256         /* By returning 1 we tell our caller that nothing is to be done,
 257          * as all the previous calls handled the data. This makes the parent
 258          * return without doing any processing.
 259          */
 260         return 1;
 261 }
 262
 263 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 264 {
 265         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 266
 267         if (n != cmdlist.end())
 268         {
 269                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 270                 {
 271                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 272                         {
 273                                 if (n->second->flags_needed)
 274                                 {
 275                                         return ((user->HasPermission(commandname)) || (ServerInstance->ULine(user->server)));
 276                                 }
 277                                 return true;
 278                         }
 279                 }
 280         }
 281         return false;
 282 }
 283
 284 // calls a handler function for a command
 285
 286 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 287 {
 288         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 289
 290         if (n != cmdlist.end())
 291         {
 292                 if (pcnt >= n->second->min_params)
 293                 {
 294                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 295                         {
 296                                 if (n->second->flags_needed)
 297                                 {
 298                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 299                                         {
 300                                                 return n->second->Handle(parameters,pcnt,user);
 301                                         }
 302                                 }
 303                                 else
 304                                 {
 305                                         return n->second->Handle(parameters,pcnt,user);
 306                                 }
 307                         }
 308                 }
 309         }
 310         return CMD_INVALID;
 311 }
 312
 313 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 314 {
 315         const char *command_p[127];
 316         int items = 0;
 317         irc::tokenstream tokens(cmd);
 318         std::string command = tokens.GetToken();
 319
 320         while (((para[items] = tokens.GetToken()) != "") && (items < 127))
 321         {
 322                 command_p[items] = para[items].c_str();
 323                 items++;
 324         }
 325
 326         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 327
 328         int MOD_RESULT = 0;
 329         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 330         if (MOD_RESULT == 1) {
 331                 return;
 332         }
 333
 334         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 335
 336         if (cm != cmdlist.end())
 337         {
 338                 if (user)
 339                 {
 340                         /* activity resets the ping pending timer */
 341                         user->nping = ServerInstance->Time() + user->pingmax;
 342                         if (cm->second->flags_needed)
 343                         {
 344                                 if (!user->IsModeSet(cm->second->flags_needed))
 345                                 {
 346                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privilages",user->nick);
 347                                         return;
 348                                 }
 349                                 if (!user->HasPermission(command))
 350                                 {
 351                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 352                                         return;
 353                                 }
 354                         }
 355                         if ((user->registered == REG_ALL) && (!*user->oper) && (cm->second->IsDisabled()))
 356                         {
 357                                 /* command is disabled! */
 358                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 359                                 return;
 360                         }
 361                         if (items < cm->second->min_params)
 362                         {
 363                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 364                                 /* If syntax is given, display this as the 461 reply */
 365                                 if ((ServerInstance->Config->SyntaxHints) && (cm->second->syntax.length()))
 366                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 367                                 return;
 368                         }
 369                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 370                         {
 371                                 /* ikky /stats counters */
 372                                 cm->second->use_count++;
 373                                 cm->second->total_bytes += cmd.length();
 374
 375                                 int MOD_RESULT = 0;
 376                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 377                                 if (MOD_RESULT == 1)
 378                                         return;
 379
 380                                 /*
 381                                  * WARNING: nothing may come after the
 382                                  * command handler call, as the handler
 383                                  * may free the user structure!
 384                                  */
 385                                 CmdResult result = cm->second->Handle(command_p,items,user);
 386
 387                                 if (result != CMD_USER_DELETED)
 388                                 {
 389                                         FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 390                                 }
 391                                 return;
 392                         }
 393                         else
 394                         {
 395                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 396                                 return;
 397                         }
 398                 }
 399         }
 400         else if (user)
 401         {
 402                 ServerInstance->stats->statsUnknown++;
 403                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 404         }
 405 }
 406
 407 bool CommandParser::RemoveCommands(const char* source)
 408 {
 409         bool go_again = true;
 410
 411         while (go_again)
 412         {
 413                 go_again = false;
 414
 415                 for (nspace::hash_map<std::string,command_t*>::iterator i = cmdlist.begin(); i != cmdlist.end(); i++)
 416                 {
 417                         command_t* x = i->second;
 418                         if (x->source == std::string(source))
 419                         {
 420                                 ServerInstance->Log(DEBUG,"removecommands(%s) Removing dependent command: %s",x->source.c_str(),x->command.c_str());
 421                                 cmdlist.erase(i);
 422                                 go_again = true;
 423                                 break;
 424                         }
 425                 }
 426         }
 427
 428         return true;
 429 }
 430
 431 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 432 {
 433         std::string::size_type a;
 434
 435         if (!user)
 436                 return;
 437
 438         while ((a = buffer.rfind("\n")) != std::string::npos)
 439                 buffer.erase(a);
 440         while ((a = buffer.rfind("\r")) != std::string::npos)
 441                 buffer.erase(a);
 442
 443         if (buffer.length())
 444         {
 445                 ServerInstance->Log(DEBUG,"CMDIN: %s %s",user->nick,buffer.c_str());
 446                 this->ProcessCommand(user,buffer);
 447         }
 448 }
 449
 450 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 451 {
 452         if (so_handle)
 453         {
 454                 if (RFCCommands.find(f->command) == RFCCommands.end())
 455                 {
 456                         RFCCommands[f->command] = so_handle;
 457                         ServerInstance->Log(DEFAULT,"Monitoring RFC-specified reloadable command at %8x",so_handle);
 458                 }
 459                 else
 460                 {
 461                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 462                         return false;
 463                 }
 464         }
 465
 466         /* create the command and push it onto the table */
 467         if (cmdlist.find(f->command) == cmdlist.end())
 468         {
 469                 cmdlist[f->command] = f;
 470                 ServerInstance->Log(DEBUG,"Added command %s (%lu parameters)",f->command.c_str(),(unsigned long)f->min_params);
 471                 return true;
 472         }
 473         else return false;
 474 }
 475
 476 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 477 {
 478         para.resize(128);
 479         this->SetupCommandTable();
 480 }
 481
 482 bool CommandParser::FindSym(void** v, void* h)
 483 {
 484         *v = dlsym(h, "init_command");
 485         const char* err = dlerror();
 486         if (err)
 487         {
 488                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 489                 return false;
 490         }
 491         return true;
 492 }
 493
 494 bool CommandParser::ReloadCommand(const char* cmd)
 495 {
 496         char filename[MAXBUF];
 497         char commandname[MAXBUF];
 498         int y = 0;
 499
 500         for (const char* x = cmd; *x; x++, y++)
 501                 commandname[y] = toupper(*x);
 502
 503         commandname[y] = 0;
 504
 505         SharedObjectList::iterator command = RFCCommands.find(commandname);
 506
 507         if (command != RFCCommands.end())
 508         {
 509                 command_t* cmdptr = cmdlist.find(commandname)->second;
 510                 cmdlist.erase(cmdlist.find(commandname));
 511
 512                 for (char* x = commandname; *x; x++)
 513                         *x = tolower(*x);
 514
 515
 516                 delete cmdptr;
 517                 dlclose(command->second);
 518                 RFCCommands.erase(command);
 519
 520                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 521                 this->LoadCommand(filename);
 522
 523                 return true;
 524         }
 525
 526         return false;
 527 }
 528
 529 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 530 {
 531         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 532         if (ServerInstance->Parser->ReloadCommand(parameters[0]))
 533         {
 534                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 535                 return CMD_SUCCESS;
 536         }
 537         else
 538         {
 539                 user->WriteServ("NOTICE %s :*** Could not reload command '%s'", user->nick, parameters[0]);
 540                 return CMD_FAILURE;
 541         }
 542 }
 543
 544 void CommandParser::LoadCommand(const char* name)
 545 {
 546         char filename[MAXBUF];
 547         void* h;
 548         command_t* (*cmd_factory_func)(InspIRCd*);
 549
 550         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 551         ServerInstance->Log(DEBUG,"Load command: %s", filename);
 552
 553         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 554
 555         if (!h)
 556         {
 557                 ServerInstance->Log(SPARSE, "Error loading core command: %s", dlerror());
 558                 return;
 559         }
 560
 561         if (this->FindSym((void **)&cmd_factory_func, h))
 562         {
 563                 command_t* newcommand = cmd_factory_func(ServerInstance);
 564                 this->CreateCommand(newcommand, h);
 565         }
 566 }
 567
 568 void CommandParser::SetupCommandTable()
 569 {
 570         RFCCommands.clear();
 571
 572         DIR* library = opendir(LIBRARYDIR);
 573         if (library)
 574         {
 575                 dirent* entry = NULL;
 576                 while ((entry = readdir(library)))
 577                 {
 578                         if (match(entry->d_name, "cmd_*.so"))
 579                         {
 580                                 this->LoadCommand(entry->d_name);
 581                         }
 582                 }
 583                 closedir(library);
 584         }
 585
 586         this->CreateCommand(new cmd_reload(ServerInstance));
 587 }
 588