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 "message.h"
  36 #include "mode.h"
  37 #include "commands.h"
  38 #include "xline.h"
  39 #include "inspstring.h"
  40 #include "helperfuncs.h"
  41 #include "hashcomp.h"
  42 #include "socketengine.h"
  43 #include "userprocess.h"
  44 #include "socket.h"
  45 #include "dns.h"
  46 #include "typedefs.h"
  47 #include "command_parse.h"
  48 #include "ctables.h"
  49
  50 #define nspace __gnu_cxx
  51
  52 extern InspIRCd* ServerInstance;
  53
  54 extern std::vector<Module*> modules;
  55 extern std::vector<ircd_module*> factory;
  56 extern std::vector<userrec*> local_users;
  57
  58 extern int MODCOUNT;
  59 extern time_t TIME;
  60
  61 extern Server* MyServer;
  62
  63 extern user_hash clientlist;
  64 extern chan_hash chanlist;
  65
  66 /* Special commands which may occur without registration of the user */
  67 cmd_user* command_user;
  68 cmd_nick* command_nick;
  69 cmd_pass* command_pass;
  70
  71
  72 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
  73  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
  74  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
  75  * the channel names and their keys as follows:
  76  * JOIN #chan1,#chan2,#chan3 key1,,key3
  77  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
  78  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
  79  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
  80  * Both will only parse until they reach ServerInstance->Config->MaxTargets number of targets, to stop abuse via spam.
  81  */
  82 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
  83 {
  84         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
  85          * which called us just carries on as it was.
  86          */
  87         if (!strchr(parameters[splithere],','))
  88                 return 0;
  89
  90         /* Create two lists, one for channel names, one for keys
  91          */
  92         irc::commasepstream items1(parameters[splithere]);
  93         irc::commasepstream items2(parameters[extra]);
  94         std::string item = "";
  95         unsigned int max = 0;
  96
  97         /* Attempt to iterate these lists and call the command objech
  98          * which called us, for every parameter pair until there are
  99          * no more left to parse.
 100          */
 101         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 102         {
 103                 std::string extrastuff = items2.GetToken();
 104                 parameters[splithere] = item.c_str();
 105                 parameters[extra] = extrastuff.c_str();
 106                 CommandObj->Handle(parameters,pcnt,user);
 107         }
 108         return 1;
 109 }
 110
 111 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 112 {
 113         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 114          * which called us just carries on as it was.
 115          */
 116         if (!strchr(parameters[splithere],','))
 117                 return 0;
 118
 119         /* Only one commasepstream here */
 120         irc::commasepstream items1(parameters[splithere]);
 121         std::string item = "";
 122         unsigned int max = 0;
 123
 124         /* Parse the commasepstream until there are no tokens remaining.
 125          * Each token we parse out, call the command handler that called us
 126          * with it
 127          */
 128         while (((item = items1.GetToken()) != "") && (max++ < ServerInstance->Config->MaxTargets))
 129         {
 130                 parameters[splithere] = item.c_str();
 131                 CommandObj->Handle(parameters,pcnt,user);
 132         }
 133         /* By returning 1 we tell our caller that nothing is to be done,
 134          * as all the previous calls handled the data. This makes the parent
 135          * return without doing any processing.
 136          */
 137         return 1;
 138 }
 139
 140 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 141 {
 142         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 143
 144         if (n != cmdlist.end())
 145         {
 146                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 147                 {
 148                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 149                         {
 150                                 if (n->second->flags_needed)
 151                                 {
 152                                         return ((user->HasPermission(commandname)) || (is_uline(user->server)));
 153                                 }
 154                                 return true;
 155                         }
 156                 }
 157         }
 158         return false;
 159 }
 160
 161 // calls a handler function for a command
 162
 163 bool CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 164 {
 165         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 166
 167         if (n != cmdlist.end())
 168         {
 169                 if (pcnt >= n->second->min_params)
 170                 {
 171                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 172                         {
 173                                 if (n->second->flags_needed)
 174                                 {
 175                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 176                                         {
 177                                                 n->second->Handle(parameters,pcnt,user);
 178                                                 return true;
 179                                         }
 180                                 }
 181                                 else
 182                                 {
 183                                         n->second->Handle(parameters,pcnt,user);
 184                                         return true;
 185                                 }
 186                         }
 187                 }
 188         }
 189         return false;
 190 }
 191
 192 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 193 {
 194         const char *command_p[127];
 195         int items = 0;
 196         std::string para[127];
 197         irc::tokenstream tokens(cmd);
 198         std::string command = tokens.GetToken();
 199
 200         while (((para[items] = tokens.GetToken()) != "") && (items < 127))
 201                 command_p[items] = para[items++].c_str();
 202
 203         std::transform(command.begin(), command.end(), command.begin(), ::toupper);
 204
 205         int MOD_RESULT = 0;
 206         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false));
 207         if (MOD_RESULT == 1) {
 208                 return;
 209         }
 210
 211         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 212
 213         if (cm != cmdlist.end())
 214         {
 215                 if (user)
 216                 {
 217                         /* activity resets the ping pending timer */
 218                         user->nping = TIME + user->pingmax;
 219                         if (cm->second->flags_needed)
 220                         {
 221                                 if (!user->IsModeSet(cm->second->flags_needed))
 222                                 {
 223                                         user->WriteServ("481 %s :Permission Denied- You do not have the required operator privilages",user->nick);
 224                                         return;
 225                                 }
 226                                 if (!user->HasPermission(command))
 227                                 {
 228                                         user->WriteServ("481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 229                                         return;
 230                                 }
 231                         }
 232                         if ((user->registered == REG_ALL) && (!*user->oper) && (cm->second->IsDisabled()))
 233                         {
 234                                 /* command is disabled! */
 235                                 user->WriteServ("421 %s %s :This command has been disabled.",user->nick,command.c_str());
 236                                 return;
 237                         }
 238                         if (items < cm->second->min_params)
 239                         {
 240                                 user->WriteServ("461 %s %s :Not enough parameters.", user->nick, command.c_str());
 241                                 /* If syntax is given, display this as the 461 reply */
 242                                 if ((ServerInstance->Config->SyntaxHints) && (cm->second->syntax.length()))
 243                                         user->WriteServ("304 %s :SYNTAX %s %s", user->nick, cm->second->command.c_str(), cm->second->syntax.c_str());
 244                                 return;
 245                         }
 246                         if ((user->registered == REG_ALL) || (cm->second == command_user) || (cm->second == command_nick) || (cm->second == command_pass))
 247                         {
 248                                 /* ikky /stats counters */
 249                                 cm->second->use_count++;
 250                                 cm->second->total_bytes += cmd.length();
 251
 252                                 int MOD_RESULT = 0;
 253                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true));
 254                                 if (MOD_RESULT == 1)
 255                                         return;
 256
 257                                 /*
 258                                  * WARNING: nothing may come after the
 259                                  * command handler call, as the handler
 260                                  * may free the user structure!
 261                                  */
 262
 263                                 cm->second->Handle(command_p,items,user);
 264                                 return;
 265                         }
 266                         else
 267                         {
 268                                 user->WriteServ("451 %s :You have not registered",command.c_str());
 269                                 return;
 270                         }
 271                 }
 272         }
 273         else if (user)
 274         {
 275                 ServerInstance->stats->statsUnknown++;
 276                 user->WriteServ("421 %s %s :Unknown command",user->nick,command.c_str());
 277         }
 278 }
 279
 280 bool CommandParser::RemoveCommands(const char* source)
 281 {
 282         bool go_again = true;
 283
 284         while (go_again)
 285         {
 286                 go_again = false;
 287
 288                 for (nspace::hash_map<std::string,command_t*>::iterator i = cmdlist.begin(); i != cmdlist.end(); i++)
 289                 {
 290                         command_t* x = i->second;
 291                         if (x->source == std::string(source))
 292                         {
 293                                 log(DEBUG,"removecommands(%s) Removing dependent command: %s",x->source.c_str(),x->command.c_str());
 294                                 cmdlist.erase(i);
 295                                 go_again = true;
 296                                 break;
 297                         }
 298                 }
 299         }
 300
 301         return true;
 302 }
 303
 304 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 305 {
 306         std::string::size_type a;
 307
 308         if (!user)
 309                 return;
 310
 311         while ((a = buffer.find("\n")) != std::string::npos)
 312                 buffer.erase(a);
 313         while ((a = buffer.find("\r")) != std::string::npos)
 314                 buffer.erase(a);
 315
 316         if (buffer.length())
 317         {
 318                 log(DEBUG,"CMDIN: %s %s",user->nick,buffer.c_str());
 319                 this->ProcessCommand(user,buffer);
 320         }
 321 }
 322
 323 bool CommandParser::CreateCommand(command_t *f)
 324 {
 325         /* create the command and push it onto the table */
 326         if (cmdlist.find(f->command) == cmdlist.end())
 327         {
 328                 cmdlist[f->command] = f;
 329                 log(DEBUG,"Added command %s (%lu parameters)",f->command.c_str(),(unsigned long)f->min_params);
 330                 return true;
 331         }
 332         else return false;
 333 }
 334
 335 CommandParser::CommandParser()
 336 {
 337         this->SetupCommandTable();
 338 }
 339
 340 void CommandParser::SetupCommandTable()
 341 {
 342         /* These three are special (can occur without
 343          * full user registration) and so are saved
 344          * for later use.
 345          */
 346         command_user = new cmd_user;
 347         command_nick = new cmd_nick;
 348         command_pass = new cmd_pass;
 349         this->CreateCommand(command_user);
 350         this->CreateCommand(command_nick);
 351         this->CreateCommand(command_pass);
 352
 353         /* The rest of these arent special. boo hoo.
 354          */
 355         this->CreateCommand(new cmd_quit);
 356         this->CreateCommand(new cmd_version);
 357         this->CreateCommand(new cmd_ping);
 358         this->CreateCommand(new cmd_pong);
 359         this->CreateCommand(new cmd_admin);
 360         this->CreateCommand(new cmd_privmsg);
 361         this->CreateCommand(new cmd_info);
 362         this->CreateCommand(new cmd_time);
 363         this->CreateCommand(new cmd_whois);
 364         this->CreateCommand(new cmd_wallops);
 365         this->CreateCommand(new cmd_notice);
 366         this->CreateCommand(new cmd_join);
 367         this->CreateCommand(new cmd_names);
 368         this->CreateCommand(new cmd_part);
 369         this->CreateCommand(new cmd_kick);
 370         this->CreateCommand(new cmd_mode);
 371         this->CreateCommand(new cmd_topic);
 372         this->CreateCommand(new cmd_who);
 373         this->CreateCommand(new cmd_motd);
 374         this->CreateCommand(new cmd_rules);
 375         this->CreateCommand(new cmd_oper);
 376         this->CreateCommand(new cmd_list);
 377         this->CreateCommand(new cmd_die);
 378         this->CreateCommand(new cmd_restart);
 379         this->CreateCommand(new cmd_kill);
 380         this->CreateCommand(new cmd_rehash);
 381         this->CreateCommand(new cmd_lusers);
 382         this->CreateCommand(new cmd_stats);
 383         this->CreateCommand(new cmd_userhost);
 384         this->CreateCommand(new cmd_away);
 385         this->CreateCommand(new cmd_ison);
 386         this->CreateCommand(new cmd_summon);
 387         this->CreateCommand(new cmd_users);
 388         this->CreateCommand(new cmd_invite);
 389         this->CreateCommand(new cmd_trace);
 390         this->CreateCommand(new cmd_whowas);
 391         this->CreateCommand(new cmd_connect);
 392         this->CreateCommand(new cmd_squit);
 393         this->CreateCommand(new cmd_modules);
 394         this->CreateCommand(new cmd_links);
 395         this->CreateCommand(new cmd_map);
 396         this->CreateCommand(new cmd_kline);
 397         this->CreateCommand(new cmd_gline);
 398         this->CreateCommand(new cmd_zline);
 399         this->CreateCommand(new cmd_qline);
 400         this->CreateCommand(new cmd_eline);
 401         this->CreateCommand(new cmd_loadmodule);
 402         this->CreateCommand(new cmd_unloadmodule);
 403         this->CreateCommand(new cmd_server);
 404         this->CreateCommand(new cmd_commands);
 405 }