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 <sched.h>
  30 #ifdef THREADED_DNS
  31 #include <pthread.h>
  32 #endif
  33 #include "users.h"
  34 #include "globals.h"
  35 #include "modules.h"
  36 #include "dynamic.h"
  37 #include "wildcard.h"
  38 #include "message.h"
  39 #include "mode.h"
  40 #include "commands.h"
  41 #include "xline.h"
  42 #include "inspstring.h"
  43 #include "dnsqueue.h"
  44 #include "helperfuncs.h"
  45 #include "hashcomp.h"
  46 #include "socketengine.h"
  47 #include "userprocess.h"
  48 #include "socket.h"
  49 #include "dns.h"
  50 #include "typedefs.h"
  51 #include "command_parse.h"
  52 #include "ctables.h"
  53
  54 #define nspace __gnu_cxx
  55
  56 extern InspIRCd* ServerInstance;
  57
  58 extern std::vector<Module*> modules;
  59 extern std::vector<ircd_module*> factory;
  60 extern std::vector<InspSocket*> module_sockets;
  61 extern std::vector<userrec*> local_users;
  62
  63 extern int MODCOUNT;
  64 extern InspSocket* socket_ref[MAX_DESCRIPTORS];
  65 extern time_t TIME;
  66
  67 // This table references users by file descriptor.
  68 // its an array to make it VERY fast, as all lookups are referenced
  69 // by an integer, meaning there is no need for a scan/search operation.
  70 extern userrec* fd_ref_table[MAX_DESCRIPTORS];
  71
  72 extern Server* MyServer;
  73 extern ServerConfig *Config;
  74
  75 extern user_hash clientlist;
  76 extern chan_hash chanlist;
  77
  78 /* Special commands which may occur without registration of the user */
  79 cmd_user* command_user;
  80 cmd_nick* command_nick;
  81 cmd_pass* command_pass;
  82
  83
  84 /* LoopCall is used to call a command classes handler repeatedly based on the contents of a comma seperated list.
  85  * There are two overriden versions of this method, one of which takes two potential lists and the other takes one.
  86  * We need a version which takes two potential lists for JOIN, because a JOIN may contain two lists of items at once,
  87  * the channel names and their keys as follows:
  88  * JOIN #chan1,#chan2,#chan3 key1,,key3
  89  * Therefore, we need to deal with both lists concurrently. The first instance of this method does that by creating
  90  * two instances of irc::commasepstream and reading them both together until the first runs out of tokens.
  91  * The second version is much simpler and just has the one stream to read, and is used in NAMES, WHOIS, PRIVMSG etc.
  92  * Both will only parse until they reach Config->MaxTargets number of targets, to stop abuse via spam.
  93  */
  94 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere, unsigned int extra)
  95 {
  96         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
  97          * which called us just carries on as it was.
  98          */
  99         if (!strchr(parameters[splithere],','))
 100                 return 0;
 101
 102         /* Create two lists, one for channel names, one for keys
 103          */
 104         irc::commasepstream items1(parameters[splithere]);
 105         irc::commasepstream items2(parameters[extra]);
 106         std::string item = "";
 107         unsigned int max = 0;
 108
 109         /* Attempt to iterate these lists and call the command objech
 110          * which called us, for every parameter pair until there are
 111          * no more left to parse.
 112          */
 113         while (((item = items1.GetToken()) != "") && (max++ < Config->MaxTargets))
 114         {
 115                 std::string extrastuff = items2.GetToken();
 116                 parameters[splithere] = item.c_str();
 117                 parameters[extra] = extrastuff.c_str();
 118                 CommandObj->Handle(parameters,pcnt,user);
 119         }
 120         return 1;
 121 }
 122
 123 int CommandParser::LoopCall(userrec* user, command_t* CommandObj, const char** parameters, int pcnt, unsigned int splithere)
 124 {
 125         /* First check if we have more than one item in the list, if we don't we return zero here and the handler
 126          * which called us just carries on as it was.
 127          */
 128         if (!strchr(parameters[splithere],','))
 129                 return 0;
 130
 131         /* Only one commasepstream here */
 132         irc::commasepstream items1(parameters[splithere]);
 133         std::string item = "";
 134         unsigned int max = 0;
 135
 136         /* Parse the commasepstream until there are no tokens remaining.
 137          * Each token we parse out, call the command handler that called us
 138          * with it
 139          */
 140         while (((item = items1.GetToken()) != "") && (max++ < Config->MaxTargets))
 141         {
 142                 parameters[splithere] = item.c_str();
 143                 CommandObj->Handle(parameters,pcnt,user);
 144         }
 145         /* By returning 1 we tell our caller that nothing is to be done,
 146          * as all the previous calls handled the data. This makes the parent
 147          * return without doing any processing.
 148          */
 149         return 1;
 150 }
 151
 152 bool CommandParser::IsValidCommand(const std::string &commandname, int pcnt, userrec * user)
 153 {
 154         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 155
 156         if (n != cmdlist.end())
 157         {
 158                 if ((pcnt>=n->second->min_params) && (n->second->source != "<core>"))
 159                 {
 160                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 161                         {
 162                                 if (n->second->flags_needed)
 163                                 {
 164                                         return ((user->HasPermission(commandname)) || (is_uline(user->server)));
 165                                 }
 166                                 return true;
 167                         }
 168                 }
 169         }
 170         return false;
 171 }
 172
 173 // calls a handler function for a command
 174
 175 bool CommandParser::CallHandler(const std::string &commandname,const char** parameters, int pcnt, userrec *user)
 176 {
 177         nspace::hash_map<std::string,command_t*>::iterator n = cmdlist.find(commandname);
 178
 179         if (n != cmdlist.end())
 180         {
 181                 if (pcnt >= n->second->min_params)
 182                 {
 183                         if ((!n->second->flags_needed) || (user->modes[n->second->flags_needed-65]))
 184                         {
 185                                 if (n->second->flags_needed)
 186                                 {
 187                                         if ((user->HasPermission(commandname)) || (!IS_LOCAL(user)))
 188                                         {
 189                                                 n->second->Handle(parameters,pcnt,user);
 190                                                 return true;
 191                                         }
 192                                 }
 193                                 else
 194                                 {
 195                                         n->second->Handle(parameters,pcnt,user);
 196                                         return true;
 197                                 }
 198                         }
 199                 }
 200         }
 201         return false;
 202 }
 203
 204 void CommandParser::ProcessCommand(userrec *user, std::string &cmd)
 205 {
 206         const char *command_p[127];
 207         int items = 0;
 208         std::string para[127];
 209         irc::tokenstream tokens(cmd);
 210         std::string command = tokens.GetToken();
 211
 212         while (((para[items] = tokens.GetToken()) != "") && (items < 127))
 213                 command_p[items] = para[items++].c_str();
 214
 215         for (std::string::iterator makeupper = command.begin(); makeupper != command.end(); makeupper++)
 216                 *makeupper = toupper(*makeupper);
 217
 218         int MOD_RESULT = 0;
 219         FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,false));
 220         if (MOD_RESULT == 1) {
 221                 return;
 222         }
 223
 224         nspace::hash_map<std::string,command_t*>::iterator cm = cmdlist.find(command);
 225
 226         if (cm != cmdlist.end())
 227         {
 228                 if (user)
 229                 {
 230                         /* activity resets the ping pending timer */
 231                         user->nping = TIME + user->pingmax;
 232                         if (cm->second->flags_needed)
 233                         {
 234                                 if (!user->IsModeSet(cm->second->flags_needed))
 235                                 {
 236                                         WriteServ(user->fd,"481 %s :Permission Denied- You do not have the required operator privilages",user->nick);
 237                                         return;
 238                                 }
 239                         }
 240                         if ((cm->second->flags_needed) && (!user->HasPermission(command)))
 241                         {
 242                                 WriteServ(user->fd,"481 %s :Permission Denied- Oper type %s does not have access to command %s",user->nick,user->oper,command.c_str());
 243                                 return;
 244                         }
 245                         if ((user->registered == 7) && (!*user->oper) && (cm->second->IsDisabled()))
 246                         {
 247                                 /* command is disabled! */
 248                                 WriteServ(user->fd,"421 %s %s :This command has been disabled.",user->nick,command.c_str());
 249                                 return;
 250                         }
 251                         if (items < cm->second->min_params)
 252                         {
 253                                 /* If syntax is given, display this as the 461 reply */
 254                                 if (cm->second->syntax.length())
 255                                         WriteServ(user->fd,"461 %s %s :Syntax: %s %s", user->nick, command.c_str(), cm->second->command.c_str(), cm->second->syntax.c_str());
 256                                 else
 257                                         WriteServ(user->fd,"461 %s %s :Not enough parameters", user->nick, command.c_str());
 258                                 return;
 259                         }
 260                         if ((user->registered == 7) || (cm->second == command_user) || (cm->second == command_nick) || (cm->second == command_pass))
 261                         {
 262                                 /* ikky /stats counters */
 263                                 cm->second->use_count++;
 264                                 cm->second->total_bytes += cmd.length();
 265
 266                                 int MOD_RESULT = 0;
 267                                 FOREACH_RESULT(I_OnPreCommand,OnPreCommand(command,command_p,items,user,true));
 268                                 if (MOD_RESULT == 1)
 269                                         return;
 270
 271                                 /*
 272                                  * WARNING: nothing may come after the
 273                                  * command handler call, as the handler
 274                                  * may free the user structure!
 275                                  */
 276
 277                                 cm->second->Handle(command_p,items,user);
 278                                 return;
 279                         }
 280                         else
 281                         {
 282                                 WriteServ(user->fd,"451 %s :You have not registered",command.c_str());
 283                                 return;
 284                         }
 285                 }
 286         }
 287         else if (user)
 288         {
 289                 ServerInstance->stats->statsUnknown++;
 290                 WriteServ(user->fd,"421 %s %s :Unknown command",user->nick,command.c_str());
 291         }
 292 }
 293
 294 bool CommandParser::RemoveCommands(const char* source)
 295 {
 296         bool go_again = true;
 297
 298         while (go_again)
 299         {
 300                 go_again = false;
 301
 302                 for (nspace::hash_map<std::string,command_t*>::iterator i = cmdlist.begin(); i != cmdlist.end(); i++)
 303                 {
 304                         command_t* x = i->second;
 305                         if (x->source == std::string(source))
 306                         {
 307                                 log(DEBUG,"removecommands(%s) Removing dependent command: %s",x->source.c_str(),x->command.c_str());
 308                                 cmdlist.erase(i);
 309                                 go_again = true;
 310                                 break;
 311                         }
 312                 }
 313         }
 314
 315         return true;
 316 }
 317
 318 void CommandParser::ProcessBuffer(std::string &buffer,userrec *user)
 319 {
 320         std::string::size_type a;
 321
 322         if (!user)
 323                 return;
 324
 325         while ((a = buffer.find("\n")) != std::string::npos)
 326                 buffer.erase(a);
 327         while ((a = buffer.find("\r")) != std::string::npos)
 328                 buffer.erase(a);
 329
 330         if (buffer.length())
 331         {
 332                 log(DEBUG,"CMDIN: %s %s",user->nick,buffer.c_str());
 333                 this->ProcessCommand(user,buffer);
 334         }
 335 }
 336
 337 bool CommandParser::CreateCommand(command_t *f)
 338 {
 339         /* create the command and push it onto the table */
 340         if (cmdlist.find(f->command) == cmdlist.end())
 341         {
 342                 cmdlist[f->command] = f;
 343                 log(DEBUG,"Added command %s (%lu parameters)",f->command.c_str(),(unsigned long)f->min_params);
 344                 return true;
 345         }
 346         else return false;
 347 }
 348
 349 CommandParser::CommandParser()
 350 {
 351         this->SetupCommandTable();
 352 }
 353
 354 void CommandParser::SetupCommandTable()
 355 {
 356         /* These three are special (can occur without
 357          * full user registration) and so are saved
 358          * for later use.
 359          */
 360         command_user = new cmd_user;
 361         command_nick = new cmd_nick;
 362         command_pass = new cmd_pass;
 363         this->CreateCommand(command_user);
 364         this->CreateCommand(command_nick);
 365         this->CreateCommand(command_pass);
 366
 367         /* The rest of these arent special. boo hoo.
 368          */
 369         this->CreateCommand(new cmd_quit);
 370         this->CreateCommand(new cmd_version);
 371         this->CreateCommand(new cmd_ping);
 372         this->CreateCommand(new cmd_pong);
 373         this->CreateCommand(new cmd_admin);
 374         this->CreateCommand(new cmd_privmsg);
 375         this->CreateCommand(new cmd_info);
 376         this->CreateCommand(new cmd_time);
 377         this->CreateCommand(new cmd_whois);
 378         this->CreateCommand(new cmd_wallops);
 379         this->CreateCommand(new cmd_notice);
 380         this->CreateCommand(new cmd_join);
 381         this->CreateCommand(new cmd_names);
 382         this->CreateCommand(new cmd_part);
 383         this->CreateCommand(new cmd_kick);
 384         this->CreateCommand(new cmd_mode);
 385         this->CreateCommand(new cmd_topic);
 386         this->CreateCommand(new cmd_who);
 387         this->CreateCommand(new cmd_motd);
 388         this->CreateCommand(new cmd_rules);
 389         this->CreateCommand(new cmd_oper);
 390         this->CreateCommand(new cmd_list);
 391         this->CreateCommand(new cmd_die);
 392         this->CreateCommand(new cmd_restart);
 393         this->CreateCommand(new cmd_kill);
 394         this->CreateCommand(new cmd_rehash);
 395         this->CreateCommand(new cmd_lusers);
 396         this->CreateCommand(new cmd_stats);
 397         this->CreateCommand(new cmd_userhost);
 398         this->CreateCommand(new cmd_away);
 399         this->CreateCommand(new cmd_ison);
 400         this->CreateCommand(new cmd_summon);
 401         this->CreateCommand(new cmd_users);
 402         this->CreateCommand(new cmd_invite);
 403         this->CreateCommand(new cmd_trace);
 404         this->CreateCommand(new cmd_whowas);
 405         this->CreateCommand(new cmd_connect);
 406         this->CreateCommand(new cmd_squit);
 407         this->CreateCommand(new cmd_modules);
 408         this->CreateCommand(new cmd_links);
 409         this->CreateCommand(new cmd_map);
 410         this->CreateCommand(new cmd_kline);
 411         this->CreateCommand(new cmd_gline);
 412         this->CreateCommand(new cmd_zline);
 413         this->CreateCommand(new cmd_qline);
 414         this->CreateCommand(new cmd_eline);
 415         this->CreateCommand(new cmd_loadmodule);
 416         this->CreateCommand(new cmd_unloadmodule);
 417         this->CreateCommand(new cmd_server);
 418         this->CreateCommand(new cmd_commands);
 419 }