[user/henk/code/inspircd.git] / include / users.h

/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2009 Daniel De Graaf <danieldg@inspircd.org>
 *   Copyright (C) 2007-2008 Robin Burchell <robin+git@viroteck.net>
 *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
 *   Copyright (C) 2003-2007 Craig Edwards <craigedwards@brainbox.cc>
 *   Copyright (C) 2007 Burlex <???@???>
 *   Copyright (C) 2007 Dennis Friis <peavey@inspircd.org>
 *
 * This file is part of InspIRCd.  InspIRCd is free software: you can
 * redistribute it and/or modify it under the terms of the GNU General Public
 * License as published by the Free Software Foundation, version 2.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */


#pragma once

#include "socket.h"
#include "inspsocket.h"
#include "mode.h"
#include "membership.h"

/** connect class types
 */
enum ClassTypes {
        /** connect:allow */
        CC_ALLOW = 0,
        /** connect:deny */
        CC_DENY  = 1,
        /** named connect block (for opers, etc) */
        CC_NAMED = 2
};

/** RFC1459 channel modes
 */
enum UserModes {
        /** +s: Server notice mask */
        UM_SNOMASK = 's' - 65,
        /** +w: WALLOPS */
        UM_WALLOPS = 'w' - 65,
        /** +i: Invisible */
        UM_INVISIBLE = 'i' - 65,
        /** +o: Operator */
        UM_OPERATOR = 'o' - 65
};

/** Registration state of a user, e.g.
 * have they sent USER, NICK, PASS yet?
 */
enum RegistrationState {

#ifndef _WIN32   // Burlex: This is already defined in win32, luckily it is still 0.
        REG_NONE = 0,           /* Has sent nothing */
#endif

        REG_USER = 1,           /* Has sent USER */
        REG_NICK = 2,           /* Has sent NICK */
        REG_NICKUSER = 3,       /* Bitwise combination of REG_NICK and REG_USER */
        REG_ALL = 7             /* REG_NICKUSER plus next bit along */
};

enum UserType {
        USERTYPE_LOCAL = 1,
        USERTYPE_REMOTE = 2,
        USERTYPE_SERVER = 3
};

/** Holds information relevent to &lt;connect allow&gt; and &lt;connect deny&gt; tags in the config file.
 */
struct CoreExport ConnectClass : public refcountbase
{
        reference<ConfigTag> config;
        /** Type of line, either CC_ALLOW or CC_DENY
         */
        char type;

        /** True if this class uses fake lag to manage flood, false if it kills */
        bool fakelag;

        /** Connect class name
         */
        std::string name;

        /** Max time to register the connection in seconds
         */
        unsigned int registration_timeout;

        /** Host mask for this line
         */
        std::string host;

        /** Number of seconds between pings for this line
         */
        unsigned int pingtime;

        /** Maximum size of sendq for users in this class (bytes)
         * Users cannot send commands if they go over this limit
         */
        unsigned long softsendqmax;

        /** Maximum size of sendq for users in this class (bytes)
         * Users are killed if they go over this limit
         */
        unsigned long hardsendqmax;

        /** Maximum size of recvq for users in this class (bytes)
         */
        unsigned long recvqmax;

        /** Seconds worth of penalty before penalty system activates
         */
        unsigned int penaltythreshold;

        /** Maximum rate of commands (units: millicommands per second) */
        unsigned int commandrate;

        /** Local max when connecting by this connection class
         */
        unsigned long maxlocal;

        /** Global max when connecting by this connection class
         */
        unsigned long maxglobal;

        /** True if max connections for this class is hit and a warning is wanted
         */
        bool maxconnwarn;

        /** Max channels for this class
         */
        unsigned int maxchans;

        /** How many users may be in this connect class before they are refused?
         * (0 = no limit = default)
         */
        unsigned long limit;

        /** If set to true, no user DNS lookups are to be performed
         */
        bool nouserdns;

        /** Create a new connect class with no settings.
         */
        ConnectClass(ConfigTag* tag, char type, const std::string& mask);
        /** Create a new connect class with inherited settings.
         */
        ConnectClass(ConfigTag* tag, char type, const std::string& mask, const ConnectClass& parent);

        /** Update the settings in this block to match the given block */
        void Update(const ConnectClass* newSettings);

        const std::string& GetName() { return name; }
        const std::string& GetHost() { return host; }

        /** Returns the registration timeout
         */
        time_t GetRegTimeout()
        {
                return (registration_timeout ? registration_timeout : 90);
        }

        /** Returns the ping frequency
         */
        unsigned int GetPingTime()
        {
                return (pingtime ? pingtime : 120);
        }

        /** Returns the maximum sendq value (soft limit)
         * Note that this is in addition to internal OS buffers
         */
        unsigned long GetSendqSoftMax()
        {
                return (softsendqmax ? softsendqmax : 4096);
        }

        /** Returns the maximum sendq value (hard limit)
         */
        unsigned long GetSendqHardMax()
        {
                return (hardsendqmax ? hardsendqmax : 0x100000);
        }

        /** Returns the maximum recvq value
         */
        unsigned long GetRecvqMax()
        {
                return (recvqmax ? recvqmax : 4096);
        }

        /** Returns the penalty threshold value
         */
        unsigned int GetPenaltyThreshold()
        {
                return penaltythreshold ? penaltythreshold : (fakelag ? 10 : 20);
        }

        unsigned int GetCommandRate()
        {
                return commandrate ? commandrate : 1000;
        }

        /** Return the maximum number of local sessions
         */
        unsigned long GetMaxLocal()
        {
                return maxlocal;
        }

        /** Returns the maximum number of global sessions
         */
        unsigned long GetMaxGlobal()
        {
                return maxglobal;
        }
};

/** Holds all information about a user
 * This class stores all information about a user connected to the irc server. Everything about a
 * connection is stored here primarily, from the user's socket ID (file descriptor) through to the
 * user's nickname and hostname.
 */
class CoreExport User : public Extensible
{
 private:
        /** Cached nick!ident@dhost value using the displayed hostname
         */
        std::string cached_fullhost;

        /** Cached ident@ip value using the real IP address
         */
        std::string cached_hostip;

        /** Cached ident@realhost value using the real hostname
         */
        std::string cached_makehost;

        /** Cached nick!ident@realhost value using the real hostname
         */
        std::string cached_fullrealhost;

        /** Set by GetIPString() to avoid constantly re-grabbing IP via sockets voodoo.
         */
        std::string cachedip;

 public:

        /** Hostname of connection.
         * This should be valid as per RFC1035.
         */
        std::string host;

        /** Time that the object was instantiated (used for TS calculation etc)
        */
        time_t age;

        /** Time the connection was created, set in the constructor. This
         * may be different from the time the user's classbase object was
         * created.
         */
        time_t signon;

        /** Client address that the user is connected from.
         * Do not modify this value directly, use SetClientIP() to change it.
         * Port is not valid for remote users.
         */
        irc::sockets::sockaddrs client_sa;

        /** The users nickname.
         * An invalid nickname indicates an unregistered connection prior to the NICK command.
         * Use InspIRCd::IsNick() to validate nicknames.
         */
        std::string nick;

        /** The user's unique identifier.
         * This is the unique identifier which the user has across the network.
         */
        const std::string uuid;

        /** The users ident reply.
         * Two characters are added to the user-defined limit to compensate for the tilde etc.
         */
        std::string ident;

        /** The host displayed to non-opers (used for cloaking etc).
         * This usually matches the value of User::host.
         */
        std::string dhost;

        /** The users full name (GECOS).
         */
        std::string fullname;

        /** The user's mode list.
         * NOT a null terminated string.
         * Also NOT an array.
         * Much love to the STL for giving us an easy to use bitset, saving us RAM.
         * if (modes[modeletter-65]) is set, then the mode is
         * set, for example, to work out if mode +s is set, we  check the field
         * User::modes['s'-65] != 0.
         * The following RFC characters o, w, s, i have constants defined via an
         * enum, such as UM_SERVERNOTICE and UM_OPETATOR.
         */
        std::bitset<64> modes;

        /** What snomasks are set on this user.
         * This functions the same as the above modes.
         */
        std::bitset<64> snomasks;

        /** Channels this user is on
         */
        UserChanList chans;

        /** The server the user is connected to.
         */
        const std::string server;

        /** The user's away message.
         * If this string is empty, the user is not marked as away.
         */
        std::string awaymsg;

        /** Time the user last went away.
         * This is ONLY RELIABLE if user IsAway()!
         */
        time_t awaytime;

        /** The oper type they logged in as, if they are an oper.
         */
        reference<OperInfo> oper;

        /** Used by User to indicate the registration status of the connection
         * It is a bitfield of the REG_NICK, REG_USER and REG_ALL bits to indicate
         * the connection state.
         */
        unsigned int registered:3;

        /** Whether or not to send an snotice about this user's quitting
         */
        unsigned int quietquit:1;

        /** If this is set to true, then all socket operations for the user
         * are dropped into the bit-bucket.
         * This value is set by QuitUser, and is not needed seperately from that call.
         * Please note that setting this value alone will NOT cause the user to quit.
         */
        unsigned int quitting:1;

        /** What type of user is this? */
        const unsigned int usertype:2;

        /** Get client IP string from sockaddr, using static internal buffer
         * @return The IP string
         */
        const std::string& GetIPString();

        /** Get CIDR mask, using default range, for this user
         */
        irc::sockets::cidr_mask GetCIDRMask();

        /** Sets the client IP for this user
         * @return true if the conversion was successful
         */
        virtual bool SetClientIP(const char* sip, bool recheck_eline = true);

        virtual void SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline = true);

        /** Constructor
         * @throw CoreException if the UID allocated to the user already exists
         */
        User(const std::string &uid, const std::string& srv, int objtype);

        /** Returns the full displayed host of the user
         * This member function returns the hostname of the user as seen by other users
         * on the server, in nick!ident\@host form.
         * @return The full masked host of the user
         */
        virtual const std::string& GetFullHost();

        /** Returns the full real host of the user
         * This member function returns the hostname of the user as seen by other users
         * on the server, in nick!ident\@host form. If any form of hostname cloaking is in operation,
         * e.g. through a module, then this method will ignore it and return the true hostname.
         * @return The full real host of the user
         */
        virtual const std::string& GetFullRealHost();

        /** This clears any cached results that are used for GetFullRealHost() etc.
         * The results of these calls are cached as generating them can be generally expensive.
         */
        void InvalidateCache();

        /** Create a displayable mode string for this users snomasks
         * @return The notice mask character sequence
         */
        const char* FormatNoticeMasks();

        /** Process a snomask modifier string, e.g. +abc-de
         * @param sm A sequence of notice mask characters
         * @return The cleaned mode sequence which can be output,
         * e.g. in the above example if masks c and e are not
         * valid, this function will return +ab-d
         */
        std::string ProcessNoticeMasks(const char *sm);

        /** Returns whether this user is currently away or not. If true,
         * further information can be found in User::awaymsg and User::awaytime
         * @return True if the user is away, false otherwise
         */
        bool IsAway() const { return (!awaymsg.empty()); }

        /** Returns whether this user is an oper or not. If true,
         * oper information can be obtained from User::oper
         * @return True if the user is an oper, false otherwise
         */
        bool IsOper() const { return oper; }

        /** Returns true if a notice mask is set
         * @param sm A notice mask character to check
         * @return True if the notice mask is set
         */
        bool IsNoticeMaskSet(unsigned char sm);

        /** Changed a specific notice mask value
         * @param sm The server notice mask to change
         * @param value An on/off value for this mask
         */
        void SetNoticeMask(unsigned char sm, bool value);

        /** Create a displayable mode string for this users umodes
         * @param showparameters The mode string
         */
        const char* FormatModes(bool showparameters = false);

        /** Returns true if a specific mode is set
         * @param m The user mode
         * @return True if the mode is set
         */
        bool IsModeSet(unsigned char m);

        /** Set a specific usermode to on or off
         * @param m The user mode
         * @param value On or off setting of the mode
         */
        void SetMode(unsigned char m, bool value);

        /** Returns true or false for if a user can execute a privilaged oper command.
         * This is done by looking up their oper type from User::oper, then referencing
         * this to their oper classes and checking the commands they can execute.
         * @param command A command (should be all CAPS)
         * @return True if this user can execute the command
         */
        virtual bool HasPermission(const std::string &command);

        /** Returns true if a user has a given permission.
         * This is used to check whether or not users may perform certain actions which admins may not wish to give to
         * all operators, yet are not commands. An example might be oper override, mass messaging (/notice $*), etc.
         *
         * @param privstr The priv to chec, e.g. "users/override/topic". These are loaded free-form from the config file.
         * @param noisy If set to true, the user is notified that they do not have the specified permission where applicable. If false, no notification is sent.
         * @return True if this user has the permission in question.
         */
        virtual bool HasPrivPermission(const std::string &privstr, bool noisy = false);

        /** Returns true or false if a user can set a privileged user or channel mode.
         * This is done by looking up their oper type from User::oper, then referencing
         * this to their oper classes, and checking the modes they can set.
         * @param mode The mode the check
         * @param type ModeType (MODETYPE_CHANNEL or MODETYPE_USER).
         * @return True if the user can set or unset this mode.
         */
        virtual bool HasModePermission(unsigned char mode, ModeType type);

        /** Creates a wildcard host.
         * Takes a buffer to use and fills the given buffer with the host in the format *!*\@hostname
         * @return The wildcarded hostname in *!*\@host form
         */
        char* MakeWildHost();

        /** Creates a usermask with real host.
         * Takes a buffer to use and fills the given buffer with the hostmask in the format user\@host
         * @return the usermask in the format user\@host
         */
        const std::string& MakeHost();

        /** Creates a usermask with real ip.
         * Takes a buffer to use and fills the given buffer with the ipmask in the format user\@ip
         * @return the usermask in the format user\@ip
         */
        const std::string& MakeHostIP();

        /** Oper up the user using the given opertype.
         * This will also give the +o usermode.
         */
        void Oper(OperInfo* info);

        /** Force a nickname change.
         * If the nickname change fails (for example, because the nick in question
         * already exists) this function will return false, and you must then either
         * output an error message, or quit the user for nickname collision.
         * @param newnick The nickname to change to
         * @return True if the nickchange was successful.
         */
        inline bool ForceNickChange(const char* newnick) { return ChangeNick(newnick, true); }

        /** Oper down.
         * This will clear the +o usermode and unset the user's oper type
         */
        void UnOper();

        /** Write text to this user, appending CR/LF. Works on local users only.
         * @param text A std::string to send to the user
         */
        virtual void Write(const std::string &text);

        /** Write text to this user, appending CR/LF.
         * Works on local users only.
         * @param text The format string for text to send to the user
         * @param ... POD-type format arguments
         */
        virtual void Write(const char *text, ...) CUSTOM_PRINTF(2, 3);

        /** Write text to this user, appending CR/LF and prepending :server.name
         * Works on local users only.
         * @param text A std::string to send to the user
         */
        void WriteServ(const std::string& text);

        /** Write text to this user, appending CR/LF and prepending :server.name
         * Works on local users only.
         * @param text The format string for text to send to the user
         * @param ... POD-type format arguments
         */
        void WriteServ(const char* text, ...) CUSTOM_PRINTF(2, 3);

        void WriteNumeric(unsigned int numeric, const char* text, ...) CUSTOM_PRINTF(3, 4);

        void WriteNumeric(unsigned int numeric, const std::string &text);

        /** Write text to this user, appending CR/LF and prepending :nick!user\@host of the user provided in the first parameter.
         * @param user The user to prepend the :nick!user\@host of
         * @param text A std::string to send to the user
         */
        void WriteFrom(User *user, const std::string &text);

        /** Write text to this user, appending CR/LF and prepending :nick!user\@host of the user provided in the first parameter.
         * @param user The user to prepend the :nick!user\@host of
         * @param text The format string for text to send to the user
         * @param ... POD-type format arguments
         */
        void WriteFrom(User *user, const char* text, ...) CUSTOM_PRINTF(3, 4);

        /** Write text to the user provided in the first parameter, appending CR/LF, and prepending THIS user's :nick!user\@host.
         * @param dest The user to route the message to
         * @param data A std::string to send to the user
         */
        void WriteTo(User *dest, const std::string &data);

        /** Write text to the user provided in the first parameter, appending CR/LF, and prepending THIS user's :nick!user\@host.
         * @param dest The user to route the message to
         * @param data The format string for text to send to the user
         * @param ... POD-type format arguments
         */
        void WriteTo(User *dest, const char *data, ...) CUSTOM_PRINTF(3, 4);

        /** Write to all users that can see this user (including this user in the list if include_self is true), appending CR/LF
         * @param line A std::string to send to the users
         * @param include_self Should the message be sent back to the author?
         */
        void WriteCommonRaw(const std::string &line, bool include_self = true);

        /** Write to all users that can see this user (including this user in the list), appending CR/LF
         * @param text The format string for text to send to the users
         * @param ... POD-type format arguments
         */
        void WriteCommon(const char* text, ...) CUSTOM_PRINTF(2, 3);

        /** Write to all users that can see this user (not including this user in the list), appending CR/LF
         * @param text The format string for text to send to the users
         * @param ... POD-type format arguments
         */
        void WriteCommonExcept(const char* text, ...) CUSTOM_PRINTF(2, 3);

        /** Write a quit message to all common users, as in User::WriteCommonExcept but with a specific
         * quit message for opers only.
         * @param normal_text Normal user quit message
         * @param oper_text Oper only quit message
         */
        void WriteCommonQuit(const std::string &normal_text, const std::string &oper_text);

        /** Dump text to a user target, splitting it appropriately to fit
         * @param LinePrefix text to prefix each complete line with
         * @param TextStream the text to send to the user
         */
        void SendText(const std::string &LinePrefix, std::stringstream &TextStream);

        /** Write to the user, routing the line if the user is remote.
         */
        virtual void SendText(const std::string& line) = 0;

        /** Write to the user, routing the line if the user is remote.
         */
        void SendText(const char* text, ...) CUSTOM_PRINTF(2, 3);

        /** Return true if the user shares at least one channel with another user
         * @param other The other user to compare the channel list against
         * @return True if the given user shares at least one channel with this user
         */
        bool SharesChannelWith(User *other);

        /** Send fake quit/join messages for host or ident cycle.
         * Run this after the item in question has changed.
         * You should not need to use this function, call ChangeDisplayedHost instead
         *
         * @param quitline The entire QUIT line, including the source using the old value
         */
        void DoHostCycle(const std::string &quitline);

        /** Change the displayed host of a user.
         * ALWAYS use this function, rather than writing User::dhost directly,
         * as this triggers module events allowing the change to be syncronized to
         * remote servers. This will also emulate a QUIT and rejoin (where configured)
         * before setting their host field.
         * @param host The new hostname to set
         * @return True if the change succeeded, false if it didn't
         */
        bool ChangeDisplayedHost(const char* host);

        /** Change the ident (username) of a user.
         * ALWAYS use this function, rather than writing User::ident directly,
         * as this correctly causes the user to seem to quit (where configured)
         * before setting their ident field.
         * @param newident The new ident to set
         * @return True if the change succeeded, false if it didn't
         */
        bool ChangeIdent(const char* newident);

        /** Change a users realname field.
         * ALWAYS use this function, rather than writing User::fullname directly,
         * as this triggers module events allowing the change to be syncronized to
         * remote servers.
         * @param gecos The user's new realname
         * @return True if the change succeeded, false if otherwise
         */
        bool ChangeName(const char* gecos);

        /** Change a user's nick
         * @param newnick The new nick
         * @param force True if the change is being forced (should not be blocked by modes like +N)
         * @return True if the change succeeded
         */
        bool ChangeNick(const std::string& newnick, bool force = false);

        /** Send a command to all local users from this user
         * The command given must be able to send text with the
         * first parameter as a servermask (e.g. $*), so basically
         * you should use PRIVMSG or NOTICE.
         * @param command the command to send
         * @param text The text format string to send
         * @param ... Format arguments
         */
        void SendAll(const char* command, const char* text, ...) CUSTOM_PRINTF(3, 4);

        /** Remove this user from all channels they are on, and delete any that are now empty.
         * This is used by QUIT, and will not send part messages!
         */
        void PurgeEmptyChannels();

        /** Get the connect class which this user belongs to. NULL for remote users.
         * @return A pointer to this user's connect class.
         */
        virtual ConnectClass* GetClass();

        /** Default destructor
         */
        virtual ~User();
        virtual CullResult cull();
};

class CoreExport UserIOHandler : public StreamSocket
{
 public:
        LocalUser* const user;
        UserIOHandler(LocalUser* me) : user(me) {}
        void OnDataReady();
        void OnError(BufferedSocketError error);

        /** Adds to the user's write buffer.
         * You may add any amount of text up to this users sendq value, if you exceed the
         * sendq value, the user will be removed, and further buffer adds will be dropped.
         * @param data The data to add to the write buffer
         */
        void AddWriteBuf(const std::string &data);
};

typedef unsigned int already_sent_t;

class CoreExport LocalUser : public User, public InviteBase
{
 public:
        LocalUser(int fd, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server);
        CullResult cull();

        UserIOHandler eh;

        /** Position in UserManager::local_users
         */
        LocalUserList::iterator localuseriter;

        /** Stats counter for bytes inbound
         */
        unsigned int bytes_in;

        /** Stats counter for bytes outbound
         */
        unsigned int bytes_out;

        /** Stats counter for commands inbound
         */
        unsigned int cmds_in;

        /** Stats counter for commands outbound
         */
        unsigned int cmds_out;

        /** Password specified by the user when they registered (if any).
         * This is stored even if the \<connect> block doesnt need a password, so that
         * modules may check it.
         */
        std::string password;

        /** Contains a pointer to the connect class a user is on from
         */
        reference<ConnectClass> MyClass;

        ConnectClass* GetClass();

        /** Call this method to find the matching \<connect> for a user, and to check them against it.
         */
        void CheckClass();

        /** Server address and port that this user is connected to.
         */
        irc::sockets::sockaddrs server_sa;

        /**
         * @return The port number of this user.
         */
        int GetServerPort();

        /** Recursion fix: user is out of SendQ and will be quit as soon as possible.
         * This can't be handled normally because QuitUser itself calls Write on other
         * users, which could trigger their SendQ to overrun.
         */
        unsigned int quitting_sendq:1;

        /** has the user responded to their previous ping?
         */
        unsigned int lastping:1;

        /** This is true if the user matched an exception (E:Line). It is used to save time on ban checks.
         */
        unsigned int exempt:1;

        /** Used by PING checking code
         */
        time_t nping;

        /** Time that the connection last sent a message, used to calculate idle time
         */
        time_t idle_lastmsg;

        /** This value contains how far into the penalty threshold the user is.
         * This is used either to enable fake lag or for excess flood quits
         */
        unsigned int CommandFloodPenalty;

        static already_sent_t already_sent_id;
        already_sent_t already_sent;

        /** Check if the user matches a G or K line, and disconnect them if they do.
         * @param doZline True if ZLines should be checked (if IP has changed since initial connect)
         * Returns true if the user matched a ban, false else.
         */
        bool CheckLines(bool doZline = false);

        /** Use this method to fully connect a user.
         * This will send the message of the day, check G/K/E lines, etc.
         */
        void FullConnect();

        /** Set the connect class to which this user belongs to.
         * @param explicit_name Set this string to tie the user to a specific class name. Otherwise, the class is fitted by checking \<connect> tags from the configuration file.
         * @return A reference to this user's current connect class.
         */
        void SetClass(const std::string &explicit_name = "");

        bool SetClientIP(const char* sip, bool recheck_eline = true);

        void SetClientIP(const irc::sockets::sockaddrs& sa, bool recheck_eline = true);

        void SendText(const std::string& line);
        void Write(const std::string& text);
        void Write(const char*, ...) CUSTOM_PRINTF(2, 3);

        /** Returns the list of channels this user has been invited to but has not yet joined.
         * @return A list of channels the user is invited to
         */
        InviteList& GetInviteList();

        /** Returns true if a user is invited to a channel.
         * @param channel A channel to look up
         * @return True if the user is invited to the given channel
         */
        bool IsInvited(Channel* chan) { return (Invitation::Find(chan, this) != NULL); }

        /** Removes a channel from a users invite list.
         * This member function is called on successfully joining an invite only channel
         * to which the user has previously been invited, to clear the invitation.
         * @param channel The channel to remove the invite to
         * @return True if the user was invited to the channel and the invite was erased, false if the user wasn't invited
         */
        bool RemoveInvite(Channel* chan);

        void RemoveExpiredInvites();

        /** Returns true or false for if a user can execute a privilaged oper command.
         * This is done by looking up their oper type from User::oper, then referencing
         * this to their oper classes and checking the commands they can execute.
         * @param command A command (should be all CAPS)
         * @return True if this user can execute the command
         */
        bool HasPermission(const std::string &command);

        /** Returns true if a user has a given permission.
         * This is used to check whether or not users may perform certain actions which admins may not wish to give to
         * all operators, yet are not commands. An example might be oper override, mass messaging (/notice $*), etc.
         *
         * @param privstr The priv to chec, e.g. "users/override/topic". These are loaded free-form from the config file.
         * @param noisy If set to true, the user is notified that they do not have the specified permission where applicable. If false, no notification is sent.
         * @return True if this user has the permission in question.
         */
        bool HasPrivPermission(const std::string &privstr, bool noisy = false);

        /** Returns true or false if a user can set a privileged user or channel mode.
         * This is done by looking up their oper type from User::oper, then referencing
         * this to their oper classes, and checking the modes they can set.
         * @param mode The mode the check
         * @param type ModeType (MODETYPE_CHANNEL or MODETYPE_USER).
         * @return True if the user can set or unset this mode.
         */
        bool HasModePermission(unsigned char mode, ModeType type);
};

class CoreExport RemoteUser : public User
{
 public:
        RemoteUser(const std::string& uid, const std::string& srv) : User(uid, srv, USERTYPE_REMOTE)
        {
        }
        virtual void SendText(const std::string& line);
};

class CoreExport FakeUser : public User
{
 public:
        FakeUser(const std::string &uid, const std::string& srv) : User(uid, srv, USERTYPE_SERVER)
        {
                nick = srv;
        }

        virtual CullResult cull();
        virtual void SendText(const std::string& line);
        virtual const std::string& GetFullHost();
        virtual const std::string& GetFullRealHost();
};

/* Faster than dynamic_cast */
/** Is a local user */
inline LocalUser* IS_LOCAL(User* u)
{
        return u->usertype == USERTYPE_LOCAL ? static_cast<LocalUser*>(u) : NULL;
}
/** Is a remote user */
inline RemoteUser* IS_REMOTE(User* u)
{
        return u->usertype == USERTYPE_REMOTE ? static_cast<RemoteUser*>(u) : NULL;
}
/** Is a server fakeuser */
inline FakeUser* IS_SERVER(User* u)
{
        return u->usertype == USERTYPE_SERVER ? static_cast<FakeUser*>(u) : NULL;
}