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