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