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