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_config.h"
  18 #include "inspircd.h"
  19 #include "configreader.h"
  20 #include <unistd.h>
  21 #include <fcntl.h>
  22 #include <sys/errno.h>
  23 #include <sys/ioctl.h>
  24 #include <sys/utsname.h>
  25 #include <time.h>
  26 #include <string>
  27 #include <sstream>
  28 #include <vector>
  29 #include <algorithm>
  30 #include "users.h"
  31 #include "globals.h"
  32 #include "modules.h"
  33 #include "dynamic.h"
  34 #include "wildcard.h"
  35 #include "mode.h"
  36 #include "commands.h"
  37 #include "xline.h"
  38 #include "inspstring.h"
  39 #include "helperfuncs.h"
  40 #include "hashcomp.h"
  41 #include "socketengine.h"
  42 #include "userprocess.h"
  43 #include "socket.h"
  44 #include "dns.h"
  45 #include "typedefs.h"
  46 #include "command_parse.h"
  47 #include "ctables.h"
  48
  49 #define nspace __gnu_cxx
  50
  51 extern InspIRCd* ServerInstance;
  52
  53 extern time_t TIME;
  54
  55 extern Server* MyServer;
  56
  57 /* Special commands which may occur without registration of the user */
  58 cmd_user* command_user;
  59 cmd_nick* command_nick;
  60 cmd_pass* command_pass;
  61
  62
  63 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
  64  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
  65  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
  66  * the channel names and their keys as follows:
  67  * JOIN #chan1,#chan2,#chan3 key1,,key3
  68  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
  69  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
  70  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
  71  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
  72  */
  73 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
  74 {
  75         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
  76          * which called us just carries on as it was.
  77          */
  78         if (!strchr(parameters[splithere],','))
  79                 return 0;
  80
  81         /* Create two lists, one for channel names, one for keys
  82          */
  83         irc::commasepstream items1(parameters[splithere]);
  84         irc::commasepstream items2(parameters[extra]);
  85         std::string item = "";
  86         unsigned int max = 0;
  87
  88         /* Attempt to iterate these lists and call the command objech
  89          * which called us, for every parameter pair until there are
  90          * no more left to parse.
  91          */
  92         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
  93         {
  94                 std::string extrastuff = items2.GetToken();
  95                 parameters[splithere] = item.c_str();
  96                 parameters[extra] = extrastuff.c_str();
  97                 CommandObj->Handle(parameters,pcnt,user);
  98         }
  99         return 1;
 100 }
 101
 102 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 103 {
 104         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 105          * which called us just carries on as it was.
 106          */
 107         if (!strchr(parameters[splithere],','))
 108                 return 0;
 109
 110         /* Only one commasepstream here */
 111         irc::commasepstream items1(parameters[splithere]);
 112         std::string item = "";
 113         unsigned int max = 0;
 114
 115         /* Parse the commasepstream until there are no tokens remaining.
 116          * Each token we parse out, call the command handler that called us
 117          * with it
 118          */
 119         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 120         {
 121                 parameters[splithere] = item.c_str();
 122                 CommandObj->Handle(parameters,pcnt,user);
 123         }
 124         /* By returning 1 we tell our caller that nothing is to be done,
 125          * as all the previous calls handled the data. This makes the parent
 126          * return without doing any processing.
 127          */
 128         return 1;
 129 }
 130
 131 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 132 {
 133         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 134
 135         if (n != cmdlist.end())
 136         {
 137                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 138                 {
 139                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 140                         {
 141                                 if (n->second->flags_needed)
 142                                 {
 143                                         return ((user->HasPermission(commandname)) || (is_uline(user->server)));
 144                                 }
 145                                 return true;
 146                         }
 147                 }
 148         }
 149         return false;
 150 }
 151
 152 // calls a handler function for a command
 153
 154 bool CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 155 {
 156         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 157
 158         if (n != cmdlist.end())
 159         {
 160                 if (pcnt >= n->second->min_params)
 161                 {
 162                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 163                         {
 164                                 if (n->second->flags_needed)
 165                                 {
 166                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 167                                         {
 168                                                 n->second->Handle(parameters,pcnt,user);
 169                                                 return true;
 170                                         }
 171                                 }
 172                                 else
 173                                 {
 174                                         n->second->Handle(parameters,pcnt,user);
 175                                         return true;
 176                                 }
 177                         }
 178                 }
 179         }
 180         return false;
 181 }
 182
 183 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 184 {
 185         const char *command_p[127];
 186         int items = 0;
 187         std::string para[127];
 188         irc::tokenstream tokens(cmd);
 189         std::string command = tokens.GetToken();
 190
 191         while (((para[items] = tokens.GetToken()) != "") && (items < 127))
 192                 command_p[items] = para[items++].c_str();
 193
 194         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 195
 196         int MOD_RESULT = 0;
 197         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false));
 198         if (MOD_RESULT == 1) {
 199                 return;
 200         }
 201
 202         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 203
 204         if (cm != cmdlist.end())
 205         {
 206                 if (user)
 207                 {
 208                         /* activity resets the ping pending timer */
 209                         user->nping = TIME + user->pingmax;
 210                         if (cm->second->flags_needed)
 211                         {
 212                                 if (!user->IsModeSet(cm->second->flags_needed))
 213                                 {
 214                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privilages",user->nick);
 215                                         return;
 216                                 }
 217                                 if (!user->HasPermission(command))
 218                                 {
 219                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 220                                         return;
 221                                 }
 222                         }
 223                         if ((user->registered == REG_ALL) && (!*user->oper) && (cm->second->IsDisabled()))
 224                         {
 225                                 /* command is disabled! */
 226                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 227                                 return;
 228                         }
 229                         if (items < cm->second->min_params)
 230                         {
 231                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 232                                 /* If syntax is given, display this as the 461 reply */
 233                                 if ((ServerInstance->Config->SyntaxHints) && (cm->second->syntax.length()))
 234                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 235                                 return;
 236                         }
 237                         if ((user->registered == REG_ALL) || (cm->second == command_user) || (cm->second == command_nick) || (cm->second == command_pass))
 238                         {
 239                                 /* ikky /stats counters */
 240                                 cm->second->use_count++;
 241                                 cm->second->total_bytes += cmd.length();
 242
 243                                 int MOD_RESULT = 0;
 244                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true));
 245                                 if (MOD_RESULT == 1)
 246                                         return;
 247
 248                                 /*
 249                                  * WARNING: nothing may come after the
 250                                  * command handler call, as the handler
 251                                  * may free the user structure!
 252                                  */
 253
 254                                 cm->second->Handle(command_p,items,user);
 255                                 return;
 256                         }
 257                         else
 258                         {
 259                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 260                                 return;
 261                         }
 262                 }
 263         }
 264         else if (user)
 265         {
 266                 ServerInstance->stats->statsUnknown++;
 267                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 268         }
 269 }
 270
 271 bool CommandParser::RemoveCommands(const char* source)
 272 {
 273         bool go_again = true;
 274
 275         while (go_again)
 276         {
 277                 go_again = false;
 278
 279                 for (nspace::hash_map<std::string,command_t*>::iterator i = cmdlist.begin(); i != cmdlist.end(); i++)
 280                 {
 281                         command_t* x = i->second;
 282                         if (x->source == std::string(source))
 283                         {
 284                                 log(DEBUG,"removecommands(%s) Removing dependent command: %s",x->source.c_str(),x->command.c_str());
 285                                 cmdlist.erase(i);
 286                                 go_again = true;
 287                                 break;
 288                         }
 289                 }
 290         }
 291
 292         return true;
 293 }
 294
 295 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 296 {
 297         std::string::size_type a;
 298
 299         if (!user)
 300                 return;
 301
 302         while ((a = buffer.find("\n")) != std::string::npos)
 303                 buffer.erase(a);
 304         while ((a = buffer.find("\r")) != std::string::npos)
 305                 buffer.erase(a);
 306
 307         if (buffer.length())
 308         {
 309                 log(DEBUG,"CMDIN: %s %s",user->nick,buffer.c_str());
 310                 this->ProcessCommand(user,buffer);
 311         }
 312 }
 313
 314 bool CommandParser::CreateCommand(command_t *f)
 315 {
 316         /* create the command and push it onto the table */
 317         if (cmdlist.find(f->command) == cmdlist.end())
 318         {
 319                 cmdlist[f->command] = f;
 320                 log(DEBUG,"Added command %s (%lu parameters)",f->command.c_str(),(unsigned long)f->min_params);
 321                 return true;
 322         }
 323         else return false;
 324 }
 325
 326 CommandParser::CommandParser()
 327 {
 328         this->SetupCommandTable();
 329 }
 330
 331 void CommandParser::SetupCommandTable()
 332 {
 333         /* These three are special (can occur without
 334          * full user registration) and so are saved
 335          * for later use.
 336          */
 337         command_user = new cmd_user;
 338         command_nick = new cmd_nick;
 339         command_pass = new cmd_pass;
 340         this->CreateCommand(command_user);
 341         this->CreateCommand(command_nick);
 342         this->CreateCommand(command_pass);
 343
 344         /* The rest of these arent special. boo hoo.
 345          */
 346         this->CreateCommand(new cmd_quit);
 347         this->CreateCommand(new cmd_version);
 348         this->CreateCommand(new cmd_ping);
 349         this->CreateCommand(new cmd_pong);
 350         this->CreateCommand(new cmd_admin);
 351         this->CreateCommand(new cmd_privmsg);
 352         this->CreateCommand(new cmd_info);
 353         this->CreateCommand(new cmd_time);
 354         this->CreateCommand(new cmd_whois);
 355         this->CreateCommand(new cmd_wallops);
 356         this->CreateCommand(new cmd_notice);
 357         this->CreateCommand(new cmd_join);
 358         this->CreateCommand(new cmd_names);
 359         this->CreateCommand(new cmd_part);
 360         this->CreateCommand(new cmd_kick);
 361         this->CreateCommand(new cmd_mode);
 362         this->CreateCommand(new cmd_topic);
 363         this->CreateCommand(new cmd_who);
 364         this->CreateCommand(new cmd_motd);
 365         this->CreateCommand(new cmd_rules);
 366         this->CreateCommand(new cmd_oper);
 367         this->CreateCommand(new cmd_list);
 368         this->CreateCommand(new cmd_die);
 369         this->CreateCommand(new cmd_restart);
 370         this->CreateCommand(new cmd_kill);
 371         this->CreateCommand(new cmd_rehash);
 372         this->CreateCommand(new cmd_lusers);
 373         this->CreateCommand(new cmd_stats);
 374         this->CreateCommand(new cmd_userhost);
 375         this->CreateCommand(new cmd_away);
 376         this->CreateCommand(new cmd_ison);
 377         this->CreateCommand(new cmd_summon);
 378         this->CreateCommand(new cmd_users);
 379         this->CreateCommand(new cmd_invite);
 380         this->CreateCommand(new cmd_trace);
 381         this->CreateCommand(new cmd_whowas);
 382         this->CreateCommand(new cmd_connect);
 383         this->CreateCommand(new cmd_squit);
 384         this->CreateCommand(new cmd_modules);
 385         this->CreateCommand(new cmd_links);
 386         this->CreateCommand(new cmd_map);
 387         this->CreateCommand(new cmd_kline);
 388         this->CreateCommand(new cmd_gline);
 389         this->CreateCommand(new cmd_zline);
 390         this->CreateCommand(new cmd_qline);
 391         this->CreateCommand(new cmd_eline);
 392         this->CreateCommand(new cmd_loadmodule);
 393         this->CreateCommand(new cmd_unloadmodule);
 394         this->CreateCommand(new cmd_server);
 395         this->CreateCommand(new cmd_commands);
 396 }