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

/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd: (C) 2002-2009 InspIRCd Development Team
 * See: http://wiki.inspircd.org/Credits
 *
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#ifndef __USERS_H__
#define __USERS_H__

#include "socket.h"
#include "dns.h"
#include "mode.h"

/** Channel status for a user
 */
enum ChanStatus {
        /** Op */
        STATUS_OP     = 4,
        /** Halfop */
        STATUS_HOP    = 2,
        /** Voice */
        STATUS_VOICE  = 1,
        /** None */
        STATUS_NORMAL = 0
};

/** connect class types
 */
enum ClassTypes {
        /** connect:allow */
        CC_ALLOW = 0,
        /** connect:deny */
        CC_DENY  = 1
};

/** 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 */
};

/* Required forward declaration */
class Channel;
class UserResolver;

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

        /** 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;

        /** (Optional) Password for this line
         */
        std::string pass;

        /** (Optional) Hash Method for this line
         */
        std::string hash;

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

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

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

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

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

        /** Port number this connect class applies to
         */
        int port;

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

        /** Reference counter.
         * This will be 1 if no users are connected, as long as it is a valid connect block
         * When it reaches 0, the object should be deleted
         */
        unsigned long RefCount;

        /** Create a new connect class with no settings.
         */
        ConnectClass(char type, const std::string& mask);
        /** Create a new connect class with inherited settings.
         */
        ConnectClass(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& GetPass() { return pass; }
        const std::string& GetHost() { return host; }
        const int GetPort() { return port; }
        
        /** 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
         */
        unsigned long GetSendqMax()
        {
                return (sendqmax ? sendqmax : 262114);
        }

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

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

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

/** Holds a complete list of all channels to which a user has been invited and has not yet joined, and the time at which they'll expire.
 */
typedef std::vector< std::pair<irc::string, time_t> > InvitedList;

/** Holds a complete list of all allow and deny tags from the configuration file (connection classes)
 */
typedef std::vector<ConnectClass*> ClassVector;

/** Typedef for the list of user-channel records for a user
 */
typedef std::map<Channel*, char> UserChanList;

/** Shorthand for an iterator into a UserChanList
 */
typedef UserChanList::iterator UCListIter;

/* Required forward declaration
 */
class User;

/** 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 EventHandler
{
 private:
        /** A list of channels the user has a pending invite to.
         * Upon INVITE channels are added, and upon JOIN, the
         * channels are removed from this list.
         */
        InvitedList invites;

        /** 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;

        /** When we erase the user (in the destructor),
         * we call this method to subtract one from all
         * mode characters this user is making use of.
         */
        void DecrementModes();

        std::set<std::string> *AllowedOperCommands;
        std::set<std::string> *AllowedPrivs;

        /** Allowed user modes from oper classes. */
        std::bitset<64> AllowedUserModes;

        /** Allowed channel modes from oper classes. */
        std::bitset<64> AllowedChanModes;

 public:
        /** Pointer to creator.
         * This is required to make use of core functions
         * from within the User class.
         */
        InspIRCd* ServerInstance;

        static LocalIntExt NICKForced;
        static LocalStringExt OperQuit;

        /** Contains a pointer to the connect class a user is on from - this will be NULL for remote connections.
         * The pointer is guarenteed to *always* be valid. :)
         */
        ConnectClass *MyClass;

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

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

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

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

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

        /** True if user has authenticated, false if otherwise
         */
        bool haspassed;

        /** 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.
         */
        char registered;

        /** Time the connection was last pinged
         */
        time_t lastping;

        /** 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;

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

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

        /** Stored reverse lookup from res_forward. Should not be used after resolution.
         */
        std::string stored_host;

        /** Starts a DNS lookup of the user's IP.
         * This will cause two UserResolver classes to be instantiated.
         * When complete, these objects set User::dns_done to true.
         */
        void StartDNSLookup();

        /** 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.
         */
        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, and the permissions they have there
         */
        UserChanList chans;

        /** The server the user is connected to.
         */
        const char* 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 IS_AWAY()!
         */
        time_t awaytime;

        /** The oper type they logged in as, if they are an oper.
         * This is used to check permissions in operclasses, so that
         * we can say 'yay' or 'nay' to any commands they issue.
         * The value of this is the value of a valid 'type name=' tag.
         */
        std::string oper;

        /** True when DNS lookups are completed.
         * The UserResolver classes res_forward and res_reverse will
         * set this value once they complete.
         */
        bool dns_done;

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

        /** User's receive queue.
         * Lines from the IRCd awaiting processing are stored here.
         * Upgraded april 2005, old system a bit hairy.
         */
        std::string recvq;

        /** User's send queue.
         * Lines waiting to be sent are stored here until their buffer is flushed.
         */
        std::string sendq;

        /** Whether or not to send an snotice about this user's quitting
         */
        bool quietquit;

        /** 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.
         */
        bool quitting;

        /** Server address and port that this user is connected to.
         * If unknown, address family is AF_UNKNOWN
         */
        irc::sockets::sockaddrs server_sa;
        /** Client address that the user is connected from.
         * Port number is only valid if local.
         *
         * Do not modify this value directly, use SetClientIP() to change it
         */
        irc::sockets::sockaddrs client_sa;

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

        /**
         * @return The port number of this user.
         */
        int GetServerPort();
        /**
         * @return The server IP address
         */
        std::string GetServerIP();

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

        /** Get a CIDR mask from the IP of this user, using a static internal buffer.
         * e.g., GetCIDRMask(16) for 223.254.214.52 returns 223.254.0.0/16
         * This may be used for CIDR clone detection, etc.
         *
         * (XXX, brief note: when we do the sockets rewrite, this should move down a
         * level so it may be used on more derived objects. -- w00t)
         */
        const char *GetCIDRMask(int range);

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

        /** This value contains how far into the penalty threshold the user is. Once its over
         * the penalty threshold then commands are held and processed on-timer.
         */
        int Penalty;

        /** Default constructor
         * @throw CoreException if the UID allocated to the user already exists
         * @param Instance Creator instance
         * @param uid User UUID, or empty to allocate one automatically
         */
        User(InspIRCd* Instance, const std::string &uid = "");

        /** 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);

        /** 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&at;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&at;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 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 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 if a user is invited to a channel.
         * @param channel A channel name to look up
         * @return True if the user is invited to the given channel
         */
        virtual bool IsInvited(const irc::string &channel);

        /** Adds a channel to a users invite list (invites them to a channel)
         * @param channel A channel name to add
         * @param timeout When the invite should expire (0 == never)
         */
        virtual void InviteTo(const irc::string &channel, time_t timeout);

        /** 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
         */
        virtual void RemoveInvite(const irc::string &channel);

        /** 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);

        /** Calls read() to read some data for this user using their fd.
         * @param buffer The buffer to read into
         * @param size The size of data to read
         * @return The number of bytes read, or -1 if an error occured.
         */
        int ReadData(void* buffer, size_t size);

        /** This method adds data to the read buffer of the user.
         * The buffer can grow to any size within limits of the available memory,
         * managed by the size of a std::string, however if any individual line in
         * the buffer grows over 600 bytes in length (which is 88 chars over the
         * RFC-specified limit per line) then the method will return false and the
         * text will not be inserted.
         * @param a The string to add to the users read buffer
         * @return True if the string was successfully added to the read buffer
         */
        bool AddBuffer(const std::string &a);

        /** This method returns true if the buffer contains at least one carriage return
         * character (e.g. one complete line may be read)
         * @return True if there is at least one complete line in the users buffer
         */
        bool BufferIsReady();

        /** This function clears the entire buffer by setting it to an empty string.
         */
        void ClearBuffer();

        /** This method returns the first available string at the tail end of the buffer
         * and advances the tail end of the buffer past the string. This means it is
         * a one way operation in a similar way to strtok(), and multiple calls return
         * multiple lines if they are available. The results of this function if there
         * are no lines to be read are unknown, always use BufferIsReady() to check if
         * it is ok to read the buffer before calling GetBuffer().
         * @return The string at the tail end of this users buffer
         */
        std::string GetBuffer();

        /** 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);

        /** Flushes as much of the user's buffer to the file descriptor as possible.
         * This function may not always flush the entire buffer, rather instead as much of it
         * as it possibly can. If the send() call fails to send the entire buffer, the buffer
         * position is advanced forwards and the rest of the data sent at the next call to
         * this method.
         */
        void FlushWriteBuf();

        /** 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
         */
        InvitedList* GetInviteList();

        /** 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();

        /** Shuts down and closes the user's socket
         * This will not cause the user to be deleted. Use InspIRCd::QuitUser for this,
         * which will call CloseSocket() for you.
         */
        void CloseSocket();

        /** Add the user to WHOWAS system
         */
        void AddToWhoWas();

        /** Oper up the user using the given opertype.
         * This will also give the +o usermode.
         * @param opertype The oper type to oper as
         */
        void Oper(const std::string &opertype, const std::string &opername);

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

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

        /** Change this users hash key to a new string.
         * You should not call this function directly. It is used by the core
         * to update the users hash entry on a nickchange.
         * @param New new user_hash key
         * @return Pointer to User in hash (usually 'this')
         */
        User* UpdateNickHash(const char* New);

        /** 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.
         */
        bool ForceNickChange(const char* newnick);

        /** 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.
         * @param text A std::string to send to the user
         */
        void Write(const std::string &text);

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

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

        /** 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 to all users that can see this user (not including this user in the list), appending CR/LF
         * @param text A std::string to send to the users
         */
        void WriteCommonExcept(const std::string &text);

        /** 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);

        /** Write a WALLOPS message from this user to all local opers.
         * If this user is not opered, the function will return without doing anything.
         * @param text The format string to send in the WALLOPS message
         * @param ... Format arguments
         */
        void WriteWallOps(const char* text, ...) CUSTOM_PRINTF(2, 3);

        /** Write a WALLOPS message from this user to all local opers.
         * If this user is not opered, the function will return without doing anything.
         * @param text The text to send in the WALLOPS message
         */
        void WriteWallOps(const std::string &text);

        /** 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 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 host 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);

        /** 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);

        /** Compile a channel list for this user, and send it to the user 'source'
         * Used internally by WHOIS
         * @param The user to send the channel list to if it is not too long
         * @return This user's channel list
         */
        std::string ChannelList(User* source);

        /** Split the channel list in cl which came from dest, and spool it to this user
         * Used internally by WHOIS
         * @param dest The user the original channel list came from
         * @param cl The  channel list as a string obtained from User::ChannelList()
         */
        void SplitChanList(User* dest, const std::string &cl);

        /** 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.
         * @return A pointer to this user's connect class
         */
        ConnectClass *GetClass();

        /** 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.
         */
        ConnectClass *SetClass(const std::string &explicit_name = "");

        /** Show the message of the day to this user
         */
        void ShowMOTD();

        /** Show the server RULES file to this user
         */
        void ShowRULES();

        /** Increases a user's command penalty by a set amount.
         */
        void IncreasePenalty(int increase);

        /** Decreases a user's command penalty by a set amount.
         */
        void DecreasePenalty(int decrease);

        /** Handle socket event.
         * From EventHandler class.
         * @param et Event type
         * @param errornum Error number for EVENT_ERROR events
         */
        void HandleEvent(EventType et, int errornum = 0);

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

/** Derived from Resolver, and performs user forward/reverse lookups.
 */
class CoreExport UserResolver : public Resolver
{
 private:
        /** User this class is 'attached' to.
         */
        User* bound_user;
        /** File descriptor teh lookup is bound to
         */
        int bound_fd;
        /** True if the lookup is forward, false if is a reverse lookup
         */
        bool fwd;
 public:
        /** Create a resolver.
         * @param Instance The creating instance
         * @param user The user to begin lookup on
         * @param to_resolve The IP or host to resolve
         * @param qt The query type
         * @param cache Modified by the constructor if the result was cached
         */
        UserResolver(InspIRCd* Instance, User* user, std::string to_resolve, QueryType qt, bool &cache);

        /** Called on successful lookup
         * @param result Result string
         * @param ttl Time to live for result
         * @param cached True if the result was found in the cache
         */
        void OnLookupComplete(const std::string &result, unsigned int ttl, bool cached);

        /** Called on failed lookup
         * @param e Error code
         * @param errormessage Error message string
         */
        void OnError(ResolverError e, const std::string &errormessage);
};

#endif