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