2 * InspIRCd -- Internet Relay Chat Daemon
4 * Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
5 * Copyright (C) 2004-2006, 2008 Craig Edwards <craigedwards@brainbox.cc>
6 * Copyright (C) 2007 Robin Burchell <robin+git@viroteck.net>
7 * Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
9 * This file is part of InspIRCd. InspIRCd is free software: you can
10 * redistribute it and/or modify it under the terms of the GNU General Public
11 * License as published by the Free Software Foundation, version 2.
13 * This program is distributed in the hope that it will be useful, but WITHOUT
14 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
15 * FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
18 * You should have received a copy of the GNU General Public License
19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
28 * Holds the values for different type of modes
29 * that can exist, USER or CHANNEL type.
40 * Holds mode actions - modes can be allowed or denied.
44 MODEACTION_DENY = 0, /* Drop the mode change, AND a parameter if its a parameterized mode */
45 MODEACTION_ALLOW = 1 /* Allow the mode */
49 * Used to mask off the mode types in the mode handler
50 * array. Used in a simple two instruction hashing function
51 * "(modeletter - 65) OR mask"
55 MASK_USER = 128, /* A user mode */
56 MASK_CHANNEL = 0 /* A channel mode */
60 * These fixed values can be used to proportionally compare module-defined prefixes to known values.
61 * For example, if your module queries a Channel, and is told that user 'joebloggs' has the prefix
62 * '$', and you dont know what $ means, then you can compare it to these three values to determine
63 * its worth against them. For example if '$' had a value of 15000, you would know it is of higher
64 * status than voice, but lower status than halfop.
65 * No two modes should have equal prefix values.
81 /** Parameter required on mode setting only */
83 /** Parameter always required */
89 /** Each mode is implemented by ONE ModeHandler class.
90 * You must derive ModeHandler and add the child class to
91 * the list of modes handled by the ircd, using
92 * ModeParser::AddMode. When the mode you implement is
93 * set by a user, the virtual function OnModeChange is
94 * called. If you specify a value greater than 0 for
95 * parameters_on or parameters_off, then when the mode is
96 * set or unset respectively, std::string ¶meter will
97 * contain the parameter given by the user, else it will
98 * contain an empty string. You may alter this parameter
99 * string, and if you alter it to an empty string, and your
100 * mode is expected to have a parameter, then this is
101 * equivalent to returning MODEACTION_DENY.
103 class CoreExport ModeHandler : public ServiceProvider
114 * The mode parameter translation type
116 TranslateType m_paramtype;
118 /** What kind of parameters does the mode take?
120 ParamSpec parameters_taken;
123 * The mode letter you're implementing.
128 * True if the mode requires oper status
134 * Mode is a 'list' mode. The behaviour
135 * of your mode is now set entirely within
136 * the class as of the 1.1 api, rather than
137 * inside the mode parser as in the 1.0 api,
138 * so the only use of this value (along with
139 * IsListMode()) is for the core to determine
140 * wether your module can produce 'lists' or not
141 * (e.g. banlists, etc)
146 * The mode type, either MODETYPE_USER or
151 /** The object type of this mode handler
155 /** The prefix char needed on channel to use this mode,
156 * only checked for channel modes
162 * The constructor for ModeHandler initalizes the mode handler.
163 * The constructor of any class you derive from ModeHandler should
164 * probably call this constructor with the parameters set correctly.
165 * @param me The module which created this mode
166 * @param name A one-word name for the mode
167 * @param modeletter The mode letter you wish to handle
168 * @param params Parameters taken by the mode
169 * @param type Type of the mode (MODETYPE_USER or MODETYPE_CHANNEL)
170 * @param mclass The object type of this mode handler, one of ModeHandler::Class
172 ModeHandler(Module* me, const std::string& name, char modeletter, ParamSpec params, ModeType type, Class mclass = MC_OTHER);
173 virtual CullResult cull();
174 virtual ~ModeHandler();
176 * Returns true if the mode is a list mode
178 bool IsListMode() const { return list; }
181 * Returns a PrefixMode* if this mode is a prefix mode, NULL otherwise
183 PrefixMode* IsPrefixMode();
186 * Returns the mode's type
188 inline ModeType GetModeType() const { return m_type; }
190 * Returns the mode's parameter translation type
192 inline TranslateType GetTranslateType() const { return m_paramtype; }
194 * Returns true if the mode can only be set/unset by an oper
196 inline bool NeedsOper() const { return oper; }
198 * Returns the number of parameters for the mode. Any non-zero
199 * value should be considered to be equivalent to one.
200 * @param adding If this is true, the number of parameters required to set the mode should be returned, otherwise the number of parameters required to unset the mode shall be returned.
201 * @return The number of parameters the mode expects
203 int GetNumParams(bool adding);
205 * Returns the mode character this handler handles.
206 * @return The mode character
208 inline char GetModeChar() { return mode; }
210 /** For user modes, return the current parameter, if any
212 virtual std::string GetUserParameter(User* useor);
215 * Called when a channel mode change access check for your mode occurs.
216 * @param source Contains the user setting the mode.
217 * @param channel contains the destination channel the modes are being set on.
218 * @param parameter The parameter for your mode. This is modifiable.
219 * @param adding This value is true when the mode is being set, or false when it is being unset.
220 * @return allow, deny, or passthru to check against the required level
222 virtual ModResult AccessCheck(User* source, Channel* channel, std::string ¶meter, bool adding);
225 * Called when a mode change for your mode occurs.
226 * @param source Contains the user setting the mode.
227 * @param dest For usermodes, contains the destination user the mode is being set on. For channelmodes, this is an undefined value.
228 * @param channel For channel modes, contains the destination channel the modes are being set on. For usermodes, this is an undefined value.
229 * @param parameter The parameter for your mode, if you indicated that your mode requires a parameter when being set or unset. Note that
230 * if you alter this value, the new value becomes the one displayed and send out to the network, also, if you set this to an empty string
231 * but you specified your mode REQUIRES a parameter, this is equivalent to returning MODEACTION_DENY and will prevent the mode from being
233 * @param adding This value is true when the mode is being set, or false when it is being unset.
234 * @return MODEACTION_ALLOW to allow the mode, or MODEACTION_DENY to prevent the mode, also see the description of 'parameter'.
236 virtual ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding); /* Can change the mode parameter as its a ref */
238 * If your mode is a listmode, then this method will be called for displaying an item list, e.g. on MODE \#channel +modechar
239 * without any parameter or other modes in the command.
240 * @param user The user issuing the command
241 * @param channel The channel they're requesting an item list of (e.g. a banlist, or an exception list etc)
243 virtual void DisplayList(User* user, Channel* channel);
245 /** In the event that the mode should be given a parameter, and no parameter was provided, this method is called.
246 * This allows you to give special information to the user, or handle this any way you like.
247 * @param user The user issuing the mode change
248 * @param dest For user mode changes, the target of the mode. For channel mode changes, NULL.
249 * @param channel For channel mode changes, the target of the mode. For user mode changes, NULL.
251 virtual void OnParameterMissing(User* user, User* dest, Channel* channel);
254 * If your mode is a listmode, this method will be called to display an empty list (just the end of list numeric)
255 * @param user The user issuing the command
256 * @param channel The channel tehy're requesting an item list of (e.g. a banlist, or an exception list etc)
258 virtual void DisplayEmptyList(User* user, Channel* channel);
261 * If your mode needs special action during a server sync to determine which side wins when comparing timestamps,
262 * override this function and use it to return true or false. The default implementation just returns true if
263 * theirs < ours. This will only be called for non-listmodes with parameters, when adding the mode and where
264 * theirs == ours (therefore the default implementation will always return false).
265 * @param their_param Their parameter if the mode has a parameter
266 * @param our_param Our parameter if the mode has a parameter
267 * @param channel The channel we are checking against
268 * @return True if the other side wins the merge, false if we win the merge for this mode.
270 virtual bool ResolveModeConflict(std::string &their_param, const std::string &our_param, Channel* channel);
273 * When a MODETYPE_USER mode handler is being removed, the core will call this method for every user on the server.
274 * The usermode will be removed using the appropiate server mode using InspIRCd::SendMode().
275 * @param user The user which the server wants to remove your mode from
277 void RemoveMode(User* user);
280 * When a MODETYPE_CHANNEL mode handler is being removed, the server will call this method for every channel on the server.
281 * The mode handler has to populate the given modestacker with mode changes that remove the mode from the channel.
282 * The default implementation of this method can remove all kinds of channel modes except listmodes.
283 * In the case of listmodes, the entire list of items must be added to the modestacker (which is handled by ListModeBase,
284 * so if you inherit from it or your mode can be removed by the default implementation then you do not have to implement
286 * @param channel The channel which the server wants to remove your mode from
287 * @param stack The mode stack to add the mode change to
289 virtual void RemoveMode(Channel* channel, irc::modestacker& stack);
291 inline unsigned int GetLevelRequired() const { return levelrequired; }
295 * Prefix modes are channel modes that grant a specific rank to members having prefix mode set.
296 * They require a parameter when setting and unsetting; the parameter is always a member of the channel.
297 * A prefix mode may be set on any number of members on a channel, but for a given member a given prefix
298 * mode is either set or not set, in other words members cannot have the same prefix mode set more than once.
300 * A rank of a member is defined as the rank given by the 'strongest' prefix mode that member has.
301 * Other parts of the IRCd use this rank to determine whether a channel action is allowable for a user or not.
302 * The rank of a prefix mode is constant, i.e. the same rank value is given to all users having that prefix mode set.
304 * Note that it is possible that the same action requires a different rank on a different channel;
305 * for example changing the topic on a channel having +t set requires a rank that is >= than the rank of a halfop,
306 * but there is no such restriction when +t isn't set.
308 class PrefixMode : public ModeHandler
311 /** The prefix character granted by this mode. '@' for op, '+' for voice, etc.
312 * If 0, this mode does not have a visible prefix character.
316 /** The prefix rank of this mode, used to compare prefix
319 unsigned int prefixrank;
324 * @param Creator The module creating this mode
325 * @param Name The user-friendly one word name of the prefix mode, e.g.: "op", "voice"
326 * @param ModeLetter The mode letter of this mode
328 PrefixMode(Module* Creator, const std::string& Name, char ModeLetter);
331 * Handles setting and unsetting the prefix mode.
332 * Finds the given member of the given channel, if it's not found an error message is sent to 'source'
333 * and MODEACTION_DENY is returned. Otherwise the mode change is attempted.
334 * @param source Source of the mode change, an error message is sent to this user if the target is not found
336 * @param channel The channel the mode change is happening on
337 * @param param The nickname or uuid of the target user
338 * @param adding True when the mode is being set, false when it is being unset
339 * @return MODEACTION_ALLOW if the change happened, MODEACTION_DENY if no change happened
340 * The latter occurs either when the member cannot be found or when the member already has this prefix set
341 * (when setting) or doesn't have this prefix set (when unsetting).
343 ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string& param, bool adding);
346 * Removes this prefix mode from all users on the given channel
347 * @param chan The channel which the server wants to remove your mode from
348 * @param stack The mode stack to add the mode change to
350 void RemoveMode(Channel* chan, irc::modestacker& stack);
353 * Mode prefix or 0. If this is defined, you should
354 * also implement GetPrefixRank() to return an integer
355 * value for this mode prefix.
357 char GetPrefix() const { return prefix; }
360 * Get the 'value' of this modes prefix.
361 * determines which to display when there are multiple.
362 * The mode with the highest value is ranked first. See the
363 * PrefixModeValue enum and Channel::GetPrefixValue() for
366 unsigned int GetPrefixRank() const { return prefixrank; }
369 /** A prebuilt mode handler which handles a simple user mode, e.g. no parameters, usable by any user, with no extra
370 * behaviour to the mode beyond the basic setting and unsetting of the mode, not allowing the mode to be set if it
371 * is already set and not allowing it to be unset if it is already unset.
372 * An example of a simple user mode is user mode +w.
374 class CoreExport SimpleUserModeHandler : public ModeHandler
377 SimpleUserModeHandler(Module* Creator, const std::string& Name, char modeletter)
378 : ModeHandler(Creator, Name, modeletter, PARAM_NONE, MODETYPE_USER) {}
379 virtual ~SimpleUserModeHandler() {}
380 virtual ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding);
383 /** A prebuilt mode handler which handles a simple channel mode, e.g. no parameters, usable by any user, with no extra
384 * behaviour to the mode beyond the basic setting and unsetting of the mode, not allowing the mode to be set if it
385 * is already set and not allowing it to be unset if it is already unset.
386 * An example of a simple channel mode is channel mode +s.
388 class CoreExport SimpleChannelModeHandler : public ModeHandler
391 SimpleChannelModeHandler(Module* Creator, const std::string& Name, char modeletter)
392 : ModeHandler(Creator, Name, modeletter, PARAM_NONE, MODETYPE_CHANNEL) {}
393 virtual ~SimpleChannelModeHandler() {}
394 virtual ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding);
397 class CoreExport ParamChannelModeHandler : public ModeHandler
400 ParamChannelModeHandler(Module* Creator, const std::string& Name, char modeletter)
401 : ModeHandler(Creator, Name, modeletter, PARAM_SETONLY, MODETYPE_CHANNEL) {}
402 virtual ModeAction OnModeChange(User* source, User* dest, Channel* channel, std::string ¶meter, bool adding);
403 /** Validate the parameter - you may change the value to normalize it. Return true if it is valid. */
404 virtual bool ParamValidate(std::string& parameter);
408 * The ModeWatcher class can be used to alter the behaviour of a mode implemented
409 * by the core or by another module. To use ModeWatcher, derive a class from it,
410 * and attach it to the mode using Server::AddModeWatcher and Server::DelModeWatcher.
411 * A ModeWatcher will be called both before and after the mode change.
413 class CoreExport ModeWatcher : public classbase
417 * The mode name this class is watching
419 const std::string mode;
422 * The mode type being watched (user or channel)
429 * The constructor initializes the mode and the mode type
431 ModeWatcher(Module* creator, const std::string& modename, ModeType type);
433 * The default destructor does nothing.
435 virtual ~ModeWatcher();
438 * Get the mode name being watched
439 * @return The mode name being watched
441 const std::string& GetModeName() const { return mode; }
444 * Get the mode type being watched
445 * @return The mode type being watched (user or channel)
447 ModeType GetModeType();
450 * Before the mode character is processed by its handler, this method will be called.
451 * @param source The sender of the mode
452 * @param dest The target user for the mode, if you are watching a user mode
453 * @param channel The target channel for the mode, if you are watching a channel mode
454 * @param parameter The parameter of the mode, if the mode is supposed to have a parameter.
455 * If you alter the parameter you are given, the mode handler will see your atered version
456 * when it handles the mode.
457 * @param adding True if the mode is being added and false if it is being removed
458 * @return True to allow the mode change to go ahead, false to abort it. If you abort the
459 * change, the mode handler (and ModeWatcher::AfterMode()) will never see the mode change.
461 virtual bool BeforeMode(User* source, User* dest, Channel* channel, std::string& parameter, bool adding);
463 * After the mode character has been processed by the ModeHandler, this method will be called.
464 * @param source The sender of the mode
465 * @param dest The target user for the mode, if you are watching a user mode
466 * @param channel The target channel for the mode, if you are watching a channel mode
467 * @param parameter The parameter of the mode, if the mode is supposed to have a parameter.
468 * You cannot alter the parameter here, as the mode handler has already processed it.
469 * @param adding True if the mode is being added and false if it is being removed
471 virtual void AfterMode(User* source, User* dest, Channel* channel, const std::string& parameter, bool adding);
474 typedef std::multimap<std::string, ModeWatcher*>::iterator ModeWatchIter;
476 /** The mode parser handles routing of modes and handling of mode strings.
477 * It marshalls, controls and maintains both ModeWatcher and ModeHandler classes,
478 * parses client to server MODE strings for user and channel modes, and performs
479 * processing for the 004 mode list numeric, amongst other things.
481 class CoreExport ModeParser
484 /** Mode handlers for each mode, to access a handler subtract
485 * 65 from the ascii value of the mode letter.
486 * The upper bit of the value indicates if its a usermode
487 * or a channel mode, so we have 256 of them not 64.
489 ModeHandler* modehandlers[256];
491 /** Mode watcher classes
493 std::multimap<std::string, ModeWatcher*> modewatchermap;
495 /** Displays the current modes of a channel or user.
496 * Used by ModeParser::Process.
498 void DisplayCurrentModes(User *user, User* targetuser, Channel* targetchannel, const char* text);
499 /** Displays the value of a list mode
500 * Used by ModeParser::Process.
502 void DisplayListModes(User* user, Channel* chan, std::string &mode_sequence);
505 * Attempts to apply a mode change to a user or channel
507 ModeAction TryMode(User* user, User* targu, Channel* targc, bool adding, unsigned char mode, std::string ¶m, bool SkipACL);
509 /** Returns a list of user or channel mode characters.
510 * Used for constructing the parts of the mode list in the 004 numeric.
511 * @param mt Controls whether to list user modes or channel modes
512 * @param needparam Return modes only if they require a parameter to be set
513 * @return The available mode letters that satisfy the given conditions
515 std::string CreateModeList(ModeType mt, bool needparam = false);
517 /** Recreate the cached mode list that is displayed in the 004 numeric
518 * in Cached004ModeList.
519 * Called when a mode handler is added or removed.
521 void RecreateModeListFor004Numeric();
523 /** The string representing the last set of modes to be parsed.
524 * Use GetLastParse() to get this value, to be used for display purposes.
526 std::string LastParse;
527 std::vector<std::string> LastParseParams;
528 std::vector<TranslateType> LastParseTranslate;
530 unsigned int sent[256];
534 /** Cached mode list for use in 004 numeric
536 std::string Cached004ModeList;
539 typedef unsigned int ModeProcessFlag;
540 enum ModeProcessFlags
542 /** If only this flag is specified, the mode change will be global
543 * and parameter modes will have their parameters explicitly set
544 * (not merged). This is the default.
548 /** If this flag is set then the parameters of non-listmodes will be
549 * merged according to their conflict resolution rules.
550 * Does not affect user modes, channel modes without a parameter and
555 /** If this flag is set then the mode change won't be handed over to
556 * the linking module to be sent to other servers, but will be processed
557 * locally and sent to local user(s) as usual.
565 /** Initialize all built-in modes
567 static void InitBuiltinModes();
569 /** Tidy a banmask. This makes a banmask 'acceptable' if fields are left out.
574 * nick!ident -> nick!ident@*
576 * host.name -> *!*\@host.name
578 * ident@host.name -> *!ident\@host.name
580 * This method can be used on both IPV4 and IPV6 user masks.
582 static void CleanMask(std::string &mask);
583 /** Get the last string to be processed, as it was sent to the user or channel.
584 * Use this to display a string you just sent to be parsed, as the actual output
585 * may be different to what you sent after it has been 'cleaned up' by the parser.
586 * @return Last parsed string, as seen by users.
588 const std::string& GetLastParse() const { return LastParse; }
589 const std::vector<std::string>& GetLastParseParams() { return LastParseParams; }
590 const std::vector<TranslateType>& GetLastParseTranslate() { return LastParseTranslate; }
591 /** Add a mode to the mode parser.
592 * @return True if the mode was successfully added.
594 bool AddMode(ModeHandler* mh);
595 /** Delete a mode from the mode parser.
596 * When a mode is deleted, the mode handler will be called
597 * for every user (if it is a user mode) or for every channel
598 * (if it is a channel mode) to unset the mode on all objects.
599 * This prevents modes staying in the system which no longer exist.
600 * @param mh The mode handler to remove
601 * @return True if the mode was successfully removed.
603 bool DelMode(ModeHandler* mh);
605 /** Add a mode watcher.
606 * A mode watcher is triggered before and after a mode handler is
607 * triggered. See the documentation of class ModeWatcher for more
609 * @param mw The ModeWatcher you want to add
611 void AddModeWatcher(ModeWatcher* mw);
613 /** Delete a mode watcher.
614 * A mode watcher is triggered before and after a mode handler is
615 * triggered. See the documentation of class ModeWatcher for more
617 * @param mw The ModeWatcher you want to delete
618 * @return True if the ModeWatcher was deleted correctly
620 bool DelModeWatcher(ModeWatcher* mw);
621 /** Process a set of mode changes from a server or user.
622 * @param parameters The parameters of the mode change, in the format
623 * they would be from a MODE command.
624 * @param user The source of the mode change, can be a server user.
625 * @param flags Optional flags controlling how the mode change is processed,
626 * defaults to MODE_NONE.
628 void Process(const std::vector<std::string>& parameters, User* user, ModeProcessFlag flags = MODE_NONE);
630 /** Find the mode handler for a given mode and type.
631 * @param modeletter mode letter to search for
632 * @param mt type of mode to search for, user or channel
633 * @returns a pointer to a ModeHandler class, or NULL of there isnt a handler for the given mode
635 ModeHandler* FindMode(unsigned const char modeletter, ModeType mt);
637 /** Find the mode handler for the given prefix mode
638 * @param modeletter The mode letter to search for
639 * @return A pointer to the PrefixMode or NULL if the mode wasn't found or it isn't a prefix mode
641 PrefixMode* FindPrefixMode(unsigned char modeletter);
643 /** Find a mode handler by its prefix.
644 * If there is no mode handler with the given prefix, NULL will be returned.
645 * @param pfxletter The prefix to find, e.g. '@'
646 * @return The mode handler which handles this prefix, or NULL if there is none.
648 PrefixMode* FindPrefix(unsigned const char pfxletter);
650 /** Returns a list of modes, space seperated by type:
653 * 3. Channel modes that require a parameter when set
654 * This is sent to users as the last part of the 004 numeric
656 const std::string& GetModeListFor004Numeric();
658 /** Generates a list of modes, comma seperated by type:
659 * 1; Listmodes EXCEPT those with a prefix
660 * 2; Modes that take a param when adding or removing
661 * 3; Modes that only take a param when adding
662 * 4; Modes that dont take a param
664 std::string GiveModeList(ModeMasks m);
666 /** This returns the PREFIX=(ohv)@%+ section of the 005 numeric, or
667 * just the "@%+" part if the parameter false
669 std::string BuildPrefixes(bool lettersAndModes = true);
672 inline const std::string& ModeParser::GetModeListFor004Numeric()
674 return Cached004ModeList;
677 inline PrefixMode* ModeHandler::IsPrefixMode()
679 return (this->type_id == MC_PREFIX ? static_cast<PrefixMode*>(this) : NULL);