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