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