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 "userprocess.h"
  28 #include "socket.h"
  29 #include "command_parse.h"
  30
  31 bool InspIRCd::ULine(const char* server)
  32 {
  33         if (!server)
  34                 return false;
  35         if (!*server)
  36                 return true;
  37
  38         return (find(Config->ulines.begin(),Config->ulines.end(),server) != Config->ulines.end());
  39 }
  40
  41 int InspIRCd::OperPassCompare(const char* data,const char* input)
  42 {
  43         int MOD_RESULT = 0;
  44         FOREACH_RESULT_I(this,I_OnOperCompare,OnOperCompare(data,input))
  45         Log(DEBUG,"OperPassCompare: %d",MOD_RESULT);
  46         if (MOD_RESULT == 1)
  47                 return 0;
  48         if (MOD_RESULT == -1)
  49                 return 1;
  50         Log(DEBUG,"strcmp fallback: '%s' '%s' %d",data,input,strcmp(data,input));
  51         return strcmp(data,input);
  52 }
  53
  54 long InspIRCd::Duration(const char* str)
  55 {
  56         char n_field[MAXBUF];
  57         long total = 0;
  58         n_field[0] = 0;
  59
  60         if ((!strchr(str,'s')) && (!strchr(str,'m')) && (!strchr(str,'h')) && (!strchr(str,'d')) && (!strchr(str,'w')) && (!strchr(str,'y')))
  61         {
  62                 std::string n = str;
  63                 n += 's';
  64                 return Duration(n.c_str());
  65         }
  66
  67         for (char* i = (char*)str; *i; i++)
  68         {
  69                 // if we have digits, build up a string for the value in n_field,
  70                 // up to 10 digits in size.
  71                 if ((*i >= '0') && (*i <= '9'))
  72                 {
  73                         strlcat(n_field,i,10);
  74                 }
  75                 else
  76                 {
  77                         // we dont have a digit, check for numeric tokens
  78                         switch (tolower(*i))
  79                         {
  80                                 case 's':
  81                                         total += atoi(n_field);
  82                                 break;
  83
  84                                 case 'm':
  85                                         total += (atoi(n_field)*duration_m);
  86                                 break;
  87
  88                                 case 'h':
  89                                         total += (atoi(n_field)*duration_h);
  90                                 break;
  91
  92                                 case 'd':
  93                                         total += (atoi(n_field)*duration_d);
  94                                 break;
  95
  96                                 case 'w':
  97                                         total += (atoi(n_field)*duration_w);
  98                                 break;
  99
 100                                 case 'y':
 101                                         total += (atoi(n_field)*duration_y);
 102                                 break;
 103                         }
 104                         n_field[0] = 0;
 105                 }
 106         }
 107         // add trailing seconds
 108         total += atoi(n_field);
 109
 110         return total;
 111 }
 112
 113 /* All other ircds when doing this check usually just look for a string of *@* or *. We're smarter than that, though. */
 114
 115 bool InspIRCd::HostMatchesEveryone(const std::string &mask, userrec* user)
 116 {
 117         char buffer[MAXBUF];
 118         char itrigger[MAXBUF];
 119         long matches = 0;
 120
 121         if (!Config->ConfValue(Config->config_data, "insane","trigger", 0, itrigger, MAXBUF))
 122                 strlcpy(itrigger,"95.5",MAXBUF);
 123
 124         if (Config->ConfValueBool(Config->config_data, "insane","hostmasks", 0))
 125                 return false;
 126
 127         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 128         {
 129                 strlcpy(buffer,u->second->ident,MAXBUF);
 130                 charlcat(buffer,'@',MAXBUF);
 131                 strlcat(buffer,u->second->host,MAXBUF);
 132                 if (match(buffer,mask.c_str()))
 133                         matches++;
 134         }
 135         float percent = ((float)matches / (float)clientlist.size()) * 100;
 136         if (percent > (float)atof(itrigger))
 137         {
 138                 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);
 139                 return true;
 140         }
 141         return false;
 142 }
 143
 144 bool InspIRCd::IPMatchesEveryone(const std::string &ip, userrec* user)
 145 {
 146         char itrigger[MAXBUF];
 147         long matches = 0;
 148
 149         if (!Config->ConfValue(Config->config_data, "insane","trigger",0,itrigger,MAXBUF))
 150                 strlcpy(itrigger,"95.5",MAXBUF);
 151
 152         if (Config->ConfValueBool(Config->config_data, "insane","ipmasks",0))
 153                 return false;
 154
 155         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 156         {
 157                 if (match(u->second->GetIPString(),ip.c_str(),true))
 158                         matches++;
 159         }
 160
 161         float percent = ((float)matches / (float)clientlist.size()) * 100;
 162         if (percent > (float)atof(itrigger))
 163         {
 164                 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);
 165                 return true;
 166         }
 167         return false;
 168 }
 169
 170 bool InspIRCd::NickMatchesEveryone(const std::string &nick, userrec* user)
 171 {
 172         char itrigger[MAXBUF];
 173         long matches = 0;
 174
 175         if (!Config->ConfValue(Config->config_data, "insane","trigger",0,itrigger,MAXBUF))
 176                 strlcpy(itrigger,"95.5",MAXBUF);
 177
 178         if (Config->ConfValueBool(Config->config_data, "insane","nickmasks",0))
 179                 return false;
 180
 181         for (user_hash::iterator u = clientlist.begin(); u != clientlist.end(); u++)
 182         {
 183                 if (match(u->second->nick,nick.c_str()))
 184                         matches++;
 185         }
 186
 187         float percent = ((float)matches / (float)clientlist.size()) * 100;
 188         if (percent > (float)atof(itrigger))
 189         {
 190                 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);
 191                 return true;
 192         }
 193         return false;
 194 }
 195
 196 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
 197  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
 198  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
 199  * the channel names and their keys as follows:
 200  * JOIN #chan1,#chan2,#chan3 key1,,key3
 201  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
 202  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
 203  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
 204  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
 205  */
 206 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
 207 {
 208         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 209          * which called us just carries on as it was.
 210          */
 211         if (!strchr(parameters[splithere],','))
 212                 return 0;
 213
 214         /* Create two lists, one for channel names, one for keys
 215          */
 216         irc::commasepstream items1(parameters[splithere]);
 217         irc::commasepstream items2(parameters[extra]);
 218         std::string item = "";
 219         unsigned int max = 0;
 220
 221         /* Attempt to iterate these lists and call the command objech
 222          * which called us, for every parameter pair until there are
 223          * no more left to parse.
 224          */
 225         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 226         {
 227                 std::string extrastuff = items2.GetToken();
 228                 parameters[splithere] = item.c_str();
 229                 parameters[extra] = extrastuff.c_str();
 230                 CommandObj->Handle(parameters,pcnt,user);
 231         }
 232         return 1;
 233 }
 234
 235 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 236 {
 237         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 238          * which called us just carries on as it was.
 239          */
 240         if (!strchr(parameters[splithere],','))
 241                 return 0;
 242
 243         /* Only one commasepstream here */
 244         irc::commasepstream items1(parameters[splithere]);
 245         std::string item = "";
 246         unsigned int max = 0;
 247
 248         /* Parse the commasepstream until there are no tokens remaining.
 249          * Each token we parse out, call the command handler that called us
 250          * with it
 251          */
 252         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 253         {
 254                 parameters[splithere] = item.c_str();
 255                 CommandObj->Handle(parameters,pcnt,user);
 256         }
 257         /* By returning 1 we tell our caller that nothing is to be done,
 258          * as all the previous calls handled the data. This makes the parent
 259          * return without doing any processing.
 260          */
 261         return 1;
 262 }
 263
 264 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 265 {
 266         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 267
 268         if (n != cmdlist.end())
 269         {
 270                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 271                 {
 272                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 273                         {
 274                                 if (n->second->flags_needed)
 275                                 {
 276                                         return ((user->HasPermission(commandname)) || (ServerInstance->ULine(user->server)));
 277                                 }
 278                                 return true;
 279                         }
 280                 }
 281         }
 282         return false;
 283 }
 284
 285 // calls a handler function for a command
 286
 287 CmdResult CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 288 {
 289         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 290
 291         if (n != cmdlist.end())
 292         {
 293                 if (pcnt >= n->second->min_params)
 294                 {
 295                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 296                         {
 297                                 if (n->second->flags_needed)
 298                                 {
 299                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 300                                         {
 301                                                 return n->second->Handle(parameters,pcnt,user);
 302                                         }
 303                                 }
 304                                 else
 305                                 {
 306                                         return n->second->Handle(parameters,pcnt,user);
 307                                 }
 308                         }
 309                 }
 310         }
 311         return CMD_INVALID;
 312 }
 313
 314 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 315 {
 316         const char *command_p[127];
 317         int items = 0;
 318         irc::tokenstream tokens(cmd);
 319         std::string command = tokens.GetToken();
 320
 321         while (((para[items] = tokens.GetToken()) != "") && (items < 127))
 322         {
 323                 command_p[items] = para[items].c_str();
 324                 items++;
 325         }
 326
 327         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 328
 329         int MOD_RESULT = 0;
 330         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false));
 331         if (MOD_RESULT == 1) {
 332                 return;
 333         }
 334
 335         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 336
 337         if (cm != cmdlist.end())
 338         {
 339                 if (user)
 340                 {
 341                         /* activity resets the ping pending timer */
 342                         user->nping = ServerInstance->Time() + user->pingmax;
 343                         if (cm->second->flags_needed)
 344                         {
 345                                 if (!user->IsModeSet(cm->second->flags_needed))
 346                                 {
 347                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privilages",user->nick);
 348                                         return;
 349                                 }
 350                                 if (!user->HasPermission(command))
 351                                 {
 352                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 353                                         return;
 354                                 }
 355                         }
 356                         if ((user->registered == REG_ALL) && (!*user->oper) && (cm->second->IsDisabled()))
 357                         {
 358                                 /* command is disabled! */
 359                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 360                                 return;
 361                         }
 362                         if (items < cm->second->min_params)
 363                         {
 364                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 365                                 /* If syntax is given, display this as the 461 reply */
 366                                 if ((ServerInstance->Config->SyntaxHints) && (cm->second->syntax.length()))
 367                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 368                                 return;
 369                         }
 370                         if ((user->registered == REG_ALL) || (cm->second->WorksBeforeReg()))
 371                         {
 372                                 /* ikky /stats counters */
 373                                 cm->second->use_count++;
 374                                 cm->second->total_bytes += cmd.length();
 375
 376                                 int MOD_RESULT = 0;
 377                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true));
 378                                 if (MOD_RESULT == 1)
 379                                         return;
 380
 381                                 /*
 382                                  * WARNING: nothing may come after the
 383                                  * command handler call, as the handler
 384                                  * may free the user structure!
 385                                  */
 386                                 CmdResult result = cm->second->Handle(command_p,items,user);
 387
 388                                 if (result != CMD_USER_DELETED)
 389                                 {
 390                                         FOREACH_MOD(I_OnPostCommand,OnPostCommand(command, command_p, items, user, result));
 391                                 }
 392                                 return;
 393                         }
 394                         else
 395                         {
 396                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 397                                 return;
 398                         }
 399                 }
 400         }
 401         else if (user)
 402         {
 403                 ServerInstance->stats->statsUnknown++;
 404                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 405         }
 406 }
 407
 408 bool CommandParser::RemoveCommands(const char* source)
 409 {
 410         bool go_again = true;
 411
 412         while (go_again)
 413         {
 414                 go_again = false;
 415
 416                 for (nspace::hash_map<std::string,command_t*>::iterator i = cmdlist.begin(); i != cmdlist.end(); i++)
 417                 {
 418                         command_t* x = i->second;
 419                         if (x->source == std::string(source))
 420                         {
 421                                 ServerInstance->Log(DEBUG,"removecommands(%s) Removing dependent command: %s",x->source.c_str(),x->command.c_str());
 422                                 cmdlist.erase(i);
 423                                 go_again = true;
 424                                 break;
 425                         }
 426                 }
 427         }
 428
 429         return true;
 430 }
 431
 432 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 433 {
 434         std::string::size_type a;
 435
 436         if (!user)
 437                 return;
 438
 439         while ((a = buffer.rfind("\n")) != std::string::npos)
 440                 buffer.erase(a);
 441         while ((a = buffer.rfind("\r")) != std::string::npos)
 442                 buffer.erase(a);
 443
 444         if (buffer.length())
 445         {
 446                 ServerInstance->Log(DEBUG,"CMDIN: %s %s",user->nick,buffer.c_str());
 447                 this->ProcessCommand(user,buffer);
 448         }
 449 }
 450
 451 bool CommandParser::CreateCommand(command_t *f, void* so_handle)
 452 {
 453         if (so_handle)
 454         {
 455                 if (RFCCommands.find(f->command) == RFCCommands.end())
 456                 {
 457                         RFCCommands[f->command] = so_handle;
 458                         ServerInstance->Log(DEFAULT,"Monitoring RFC-specified reloadable command at %8x",so_handle);
 459                 }
 460                 else
 461                 {
 462                         ServerInstance->Log(DEFAULT,"ERK! Somehow, we loaded a cmd_*.so file twice! Only the first instance is being recorded.");
 463                         return false;
 464                 }
 465         }
 466
 467         /* create the command and push it onto the table */
 468         if (cmdlist.find(f->command) == cmdlist.end())
 469         {
 470                 cmdlist[f->command] = f;
 471                 ServerInstance->Log(DEBUG,"Added command %s (%lu parameters)",f->command.c_str(),(unsigned long)f->min_params);
 472                 return true;
 473         }
 474         else return false;
 475 }
 476
 477 CommandParser::CommandParser(InspIRCd* Instance) : ServerInstance(Instance)
 478 {
 479         para.resize(128);
 480         this->SetupCommandTable();
 481 }
 482
 483 bool CommandParser::FindSym(void** v, void* h)
 484 {
 485         *v = dlsym(h, "init_command");
 486         const char* err = dlerror();
 487         if (err)
 488         {
 489                 ServerInstance->Log(SPARSE, "Error loading core command: %s\n", err);
 490                 return false;
 491         }
 492         return true;
 493 }
 494
 495 bool CommandParser::ReloadCommand(const char* cmd)
 496 {
 497         char filename[MAXBUF];
 498         char commandname[MAXBUF];
 499         int y = 0;
 500
 501         for (const char* x = cmd; *x; x++, y++)
 502                 commandname[y] = toupper(*x);
 503
 504         commandname[y] = 0;
 505
 506         SharedObjectList::iterator command = RFCCommands.find(commandname);
 507
 508         if (command != RFCCommands.end())
 509         {
 510                 command_t* cmdptr = cmdlist.find(commandname)->second;
 511                 cmdlist.erase(cmdlist.find(commandname));
 512
 513                 for (char* x = commandname; *x; x++)
 514                         *x = tolower(*x);
 515
 516
 517                 delete cmdptr;
 518                 dlclose(command->second);
 519                 RFCCommands.erase(command);
 520
 521                 sprintf(filename, "cmd_%s.so", commandname);
 522                 this->LoadCommand(filename);
 523
 524                 return true;
 525         }
 526
 527         return false;
 528 }
 529
 530 CmdResult cmd_reload::Handle(const char** parameters, int pcnt, userrec *user)
 531 {
 532         user->WriteServ("NOTICE %s :*** Reloading command '%s'",user->nick, parameters[0]);
 533         if (ServerInstance->Parser->ReloadCommand(parameters[0]))
 534         {
 535                 user->WriteServ("NOTICE %s :*** Successfully reloaded command '%s'", user->nick, parameters[0]);
 536                 return CMD_SUCCESS;
 537         }
 538         else
 539         {
 540                 user->WriteServ("NOTICE %s :*** Could not reload command '%s'", user->nick, parameters[0]);
 541                 return CMD_FAILURE;
 542         }
 543 }
 544
 545 void CommandParser::LoadCommand(const char* name)
 546 {
 547         char filename[MAXBUF];
 548         void* h;
 549         command_t* (*cmd_factory_func)(InspIRCd*);
 550
 551         snprintf(filename, MAXBUF, "%s/%s", LIBRARYDIR, name);
 552         ServerInstance->Log(DEBUG,"Load command: %s", filename);
 553
 554         h = dlopen(filename, RTLD_NOW | RTLD_GLOBAL);
 555
 556         if (!h)
 557         {
 558                 ServerInstance->Log(SPARSE, "Error loading core command: %s", dlerror());
 559                 return;
 560         }
 561
 562         if (this->FindSym((void **)&cmd_factory_func, h))
 563         {
 564                 command_t* newcommand = cmd_factory_func(ServerInstance);
 565                 this->CreateCommand(newcommand, h);
 566         }
 567 }
 568
 569 void CommandParser::SetupCommandTable()
 570 {
 571         RFCCommands.clear();
 572
 573         DIR* library = opendir(LIBRARYDIR);
 574         if (library)
 575         {
 576                 dirent* entry = NULL;
 577                 while ((entry = readdir(library)))
 578                 {
 579                         if (match(entry->d_name, "cmd_*.so"))
 580                         {
 581                                 this->LoadCommand(entry->d_name);
 582                         }
 583                 }
 584                 closedir(library);
 585         }
 586
 587         this->CreateCommand(new cmd_reload(ServerInstance));
 588 }
 589