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                 const char* new_parameters[127];
 227
 228                 for (int t = 0; (t < pcnt) && (t < 127); t++)
 229                         new_parameters[t] = parameters[t];
 230
 231                 std::string extrastuff = items2.GetToken();
 232
 233                 new_parameters[splithere] = item.c_str();
 234                 new_parameters[extra] = extrastuff.c_str();
 235
 236                 CommandObj->Handle(new_parameters,pcnt,user);
 237         }
 238         return 1;
 239 }
 240
 241 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 242 {
 243         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 244          * which called us just carries on as it was.
 245          */
 246         if (!strchr(parameters[splithere],','))
 247                 return 0;
 248
 249         /* Only one commasepstream here */
 250         ServerInstance->Log(DEBUG,"Splitting '%s'",parameters[splithere]);
 251         irc::commasepstream items1(parameters[splithere]);
 252         std::string item = "*";
 253         unsigned int max = 0;
 254
 255         /* Parse the commasepstream until there are no tokens remaining.
 256          * Each token we parse out, call the command handler that called us
 257          * with it
 258          */
 259         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 260         {
 261                 const char* new_parameters[127];
 262
 263                 for (int t = 0; (t < pcnt) && (t < 127); t++)
 264                         new_parameters[t] = parameters[t];
 265
 266                 new_parameters[splithere] = item.c_str();
 267
 268                 parameters[splithere] = item.c_str();
 269                 CommandObj->Handle(new_parameters,pcnt,user);
 270         }
 271         /* By returning 1 we tell our caller that nothing is to be done,
 272          * as all the previous calls handled the data. This makes the parent
 273          * return without doing any processing.
 274          */
 275         return 1;
 276 }
 277
 278 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 279 {
 280         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 281
 282         if (n != cmdlist.end())
 283         {
 284                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 285                 {
 286                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 287                         {
 288                                 if (n->second->flags_needed)
 289                                 {
 290                                         return ((user->HasPermission(commandname)) || (ServerInstance->ULine(user->server)));
 291                                 }
 292                                 return true;
 293                         }
 294                 }
 295         }
 296         return false;
 297 }
 298
 299 command_t* CommandParser::GetHandler(const std::string &commandname)
 300 {
 301         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 302         if (n != cmdlist.end())
 303                 return n->second;
 304
 305         return NULL;
 306 }
 307
 308 // calls a handler function for a command
 309
 310 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 311 {
 312         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 313
 314         if (n != cmdlist.end())
 315         {
 316                 if (pcnt >= n->second->min_params)
 317                 {
 318                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 319                         {
 320                                 if (n->second->flags_needed)
 321                                 {
 322                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 323                                         {
 324                                                 return n->second->Handle(parameters,pcnt,user);
 325                                         }
 326                                 }
 327                                 else
 328                                 {
 329                                         return n->second->Handle(parameters,pcnt,user);
 330                                 }
 331                         }
 332                 }
 333         }
 334         return CMD_INVALID;
 335 }
 336
 337 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 338 {
 339         const char *command_p[127];
 340         int items = 0;
 341         irc::tokenstream tokens(cmd);
 342         std::string command = tokens.GetToken();
 343
 344         while (((para[items] = tokens.GetToken()) != "") && (items < 127))
 345         {
 346                 command_p[items] = para[items].c_str();
 347                 items++;
 348         }
 349
 350         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 351
 352         int MOD_RESULT = 0;
 353         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false,cmd));
 354         if (MOD_RESULT == 1) {
 355                 return;
 356         }
 357
 358         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 359
 360         if (cm != cmdlist.end())
 361         {
 362                 if (user)
 363                 {
 364                         /* activity resets the ping pending timer */
 365                         user->nping = ServerInstance->Time() + user->pingmax;
 366                         if (cm->second->flags_needed)
 367                         {
 368                                 if (!user->IsModeSet(cm->second->flags_needed))
 369                                 {
 370                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privilages",user->nick);
 371                                         return;
 372                                 }
 373                                 if (!user->HasPermission(command))
 374                                 {
 375                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 376                                         return;
 377                                 }
 378                         }
 379                         if ((user->registered == REG_ALL) && (!*user->oper) && (cm->second->IsDisabled()))
 380                         {
 381                                 /* command is disabled! */
 382                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 383                                 return;
 384                         }
 385                         if (items < cm->second->min_params)
 386                         {
 387                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 388                                 /* If syntax is given, display this as the 461 reply */
 389                                 if ((ServerInstance->Config->SyntaxHints) && (cm->second->syntax.length()))
 390                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 391                                 return;
 392                         }
 393                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 394                         {
 395                                 /* ikky /stats counters */
 396                                 cm->second->use_count++;
 397                                 cm->second->total_bytes += cmd.length();
 398
 399                                 int MOD_RESULT = 0;
 400                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true,cmd));
 401                                 if (MOD_RESULT == 1)
 402                                         return;
 403
 404                                 /*
 405                                  * WARNING: nothing may come after the
 406                                  * command handler call, as the handler
 407                                  * may free the user structure!
 408                                  */
 409                                 CmdResult result = cm->second->Handle(command_p,items,user);
 410
 411                                 if (result != CMD_USER_DELETED)
 412                                 {
 413                                         FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result,cmd));
 414                                 }
 415                                 return;
 416                         }
 417                         else
 418                         {
 419                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 420                                 return;
 421                         }
 422                 }
 423         }
 424         else if (user)
 425         {
 426                 ServerInstance->stats->statsUnknown++;
 427                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 428         }
 429 }
 430
 431 bool CommandParser::RemoveCommands(const char* source)
 432 {
 433         bool go_again = true;
 434
 435         while (go_again)
 436         {
 437                 go_again = false;
 438
 439                 for (nspace::hash_map<std::string,command_t*>::iterator i = cmdlist.begin(); i != cmdlist.end(); i++)
 440                 {
 441                         command_t* x = i->second;
 442                         if (x->source == std::string(source))
 443                         {
 444                                 ServerInstance->Log(DEBUG,"removecommands(%s) Removing dependent command: %s",x->source.c_str(),x->command.c_str());
 445                                 cmdlist.erase(i);
 446                                 go_again = true;
 447                                 break;
 448                         }
 449                 }
 450         }
 451
 452         return true;
 453 }
 454
 455 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 456 {
 457         std::string::size_type a;
 458
 459         if (!user)
 460                 return;
 461
 462         while ((a = buffer.rfind("\n")) != std::string::npos)
 463                 buffer.erase(a);
 464         while ((a = buffer.rfind("\r")) != std::string::npos)
 465                 buffer.erase(a);
 466
 467         if (buffer.length())
 468         {
 469                 ServerInstance->Log(DEBUG,"CMDIN: %s %s",user->nick,buffer.c_str());
 470                 this->ProcessCommand(user,buffer);
 471         }
 472 }
 473
 474 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 475 {
 476         if (so_handle)
 477         {
 478                 if (RFCCommands.find(f->command) == RFCCommands.end())
 479                 {
 480                         RFCCommands[f->command] = so_handle;
 481                         ServerInstance->Log(DEFAULT,"Monitoring RFC-specified reloadable command at %8x",so_handle);
 482                 }
 483                 else
 484                 {
 485                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 486                         return false;
 487                 }
 488         }
 489
 490         /* create the command and push it onto the table */
 491         if (cmdlist.find(f->command) == cmdlist.end())
 492         {
 493                 cmdlist[f->command] = f;
 494                 ServerInstance->Log(DEBUG,"Added command %s (%lu parameters)",f->command.c_str(),(unsigned long)f->min_params);
 495                 return true;
 496         }
 497         else return false;
 498 }
 499
 500 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 501 {
 502         para.resize(128);
 503         this->SetupCommandTable();
 504 }
 505
 506 bool CommandParser::FindSym(void** v, void* h)
 507 {
 508         *v = dlsym(h, "init_command");
 509         const char* err = dlerror();
 510         if (err)
 511         {
 512                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 513                 return false;
 514         }
 515         return true;
 516 }
 517
 518 bool CommandParser::ReloadCommand(const char* cmd)
 519 {
 520         char filename[MAXBUF];
 521         char commandname[MAXBUF];
 522         int y = 0;
 523
 524         for (const char* x = cmd; *x; x++, y++)
 525                 commandname[y] = toupper(*x);
 526
 527         commandname[y] = 0;
 528
 529         SharedObjectList::iterator command = RFCCommands.find(commandname);
 530
 531         if (command != RFCCommands.end())
 532         {
 533                 command_t* cmdptr = cmdlist.find(commandname)->second;
 534                 cmdlist.erase(cmdlist.find(commandname));
 535
 536                 for (char* x = commandname; *x; x++)
 537                         *x = tolower(*x);
 538
 539
 540                 delete cmdptr;
 541                 dlclose(command->second);
 542                 RFCCommands.erase(command);
 543
 544                 snprintf(filename, MAXBUF, "cmd_%s.so", commandname);
 545                 this->LoadCommand(filename);
 546
 547                 return true;
 548         }
 549
 550         return false;
 551 }
 552
 553 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 554 {
 555         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 556         if (ServerInstance->Parser->ReloadCommand(parameters[0]))
 557         {
 558                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 559                 return CMD_SUCCESS;
 560         }
 561         else
 562         {
 563                 user->WriteServ("NOTICE %s :*** Could not reload command '%s'", user->nick, parameters[0]);
 564                 return CMD_FAILURE;
 565         }
 566 }
 567
 568 void CommandParser::LoadCommand(const char* name)
 569 {
 570         char filename[MAXBUF];
 571         void* h;
 572         command_t* (*cmd_factory_func)(InspIRCd*);
 573
 574         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 575         ServerInstance->Log(DEBUG,"Load command: %s", filename);
 576
 577         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 578
 579         if (!h)
 580         {
 581                 ServerInstance->Log(SPARSE, "Error loading core command: %s", dlerror());
 582                 return;
 583         }
 584
 585         if (this->FindSym((void **)&cmd_factory_func, h))
 586         {
 587                 command_t* newcommand = cmd_factory_func(ServerInstance);
 588                 this->CreateCommand(newcommand, h);
 589         }
 590 }
 591
 592 void CommandParser::SetupCommandTable()
 593 {
 594         RFCCommands.clear();
 595
 596         DIR* library = opendir(LIBRARYDIR);
 597         if (library)
 598         {
 599                 dirent* entry = NULL;
 600                 while ((entry = readdir(library)))
 601                 {
 602                         if (match(entry->d_name, "cmd_*.so"))
 603                         {
 604                                 this->LoadCommand(entry->d_name);
 605                         }
 606                 }
 607                 closedir(library);
 608         }
 609
 610         this->CreateCommand(new cmd_reload(ServerInstance));
 611 }
 612