Sync helpop chmodes s and p with docs

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

/*
 * InspIRCd -- Internet Relay Chat Daemon
 *
 *   Copyright (C) 2019-2020 Matt Schatz <genius3000@g3k.solutions>
 *   Copyright (C) 2019 linuxdaemon <linuxdaemon.irc@gmail.com>
 *   Copyright (C) 2013 Daniel Vassdal <shutter@canternet.org>
 *   Copyright (C) 2012-2016, 2018 Attila Molnar <attilamolnar@hush.com>
 *   Copyright (C) 2012-2013, 2016-2021 Sadie Powell <sadie@witchery.services>
 *   Copyright (C) 2012, 2019 Robby <robby@chatbelgie.be>
 *   Copyright (C) 2012 DjSlash <djslash@djslash.org>
 *   Copyright (C) 2012 ChrisTX <xpipe@hotmail.de>
 *   Copyright (C) 2011 jackmcbarn <jackmcbarn@inspircd.org>
 *   Copyright (C) 2009-2010 Daniel De Graaf <danieldg@inspircd.org>
 *   Copyright (C) 2009 Uli Schlachter <psychon@inspircd.org>
 *   Copyright (C) 2008 Thomas Stagner <aquanight@inspircd.org>
 *   Copyright (C) 2008 John Brooks <special@inspircd.org>
 *   Copyright (C) 2007, 2009 Dennis Friis <peavey@inspircd.org>
 *   Copyright (C) 2006-2009 Robin Burchell <robin+git@viroteck.net>
 *   Copyright (C) 2003-2008 Craig Edwards <brain@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
};

/** 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 relevant 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;

        /** Hosts that this user can connect from as a string. */
        std::string host;

        /** Hosts that this user can connect from as a vector. */
        std::vector<std::string> hosts;

        /** 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 resolvehostnames;

        /**
         * If non-empty the server ports which this user has to be using
         */
        insp::flat_set<int> ports;

        /** If non-empty then the password a user must specify in PASS to be assigned to this class. */
        std::string password;

        /** If non-empty then the hash algorithm that the password field is hashed with. */
        std::string passwordhash;

        /** 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() const { return name; }
        const std::string& GetHost() const { return host; }
        const std::vector<std::string>& GetHosts() const { return hosts; }

        /** 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;

        /** If set then the hostname which is displayed to users. */
        std::string displayhost;

        /** The real hostname of this user. */
        std::string realhost;

        /** The real name of this user. */
        std::string realname;

        /** The user's mode list.
         * Much love to the STL for giving us an easy to use bitset, saving us RAM.
         * if (modes[modeid]) is set, then the mode is set.
         * For example, to work out if mode +i is set, we check the field
         * User::modes[invisiblemode->modeid] == true.
         */
        std::bitset<ModeParser::MODEID_MAX> modes;

 public:
        /** To execute a function for each local neighbor of a user, inherit from this class and
         * pass an instance of it to User::ForEachNeighbor().
         */
        class ForEachNeighborHandler
        {
         public:
                /** Method to execute for each local neighbor of a user.
                 * Derived classes must implement this.
                 * @param user Current neighbor
                 */
                virtual void Execute(LocalUser* user) = 0;
        };

        /** List of Memberships for this user
         */
        typedef insp::intrusive_list<Membership> ChanList;

        /** 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;

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

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

        /** The server the user is connected to.
         */
        Server* 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;

        /** 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 separately 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();

        /** Retrieves this user's hostname.
         * @param uncloak If true then return the real host; otherwise, the display host.
         */
        const std::string& GetHost(bool uncloak) const;

        /** Retrieves this user's displayed hostname. */
        const std::string& GetDisplayedHost() const;

        /** Retrieves this user's real hostname. */
        const std::string& GetRealHost() const;

        /** Retrieves this user's real name. */
        const std::string& GetRealName() const;

        /** 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 std::string& address);

        virtual void SetClientIP(const irc::sockets::sockaddrs& sa);

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

        /** 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);

        /** Get the mode letters of modes set on the user as a string.
         * @param includeparams True to get the parameters of the modes as well. Defaults to false.
         * @return Mode letters of modes set on the user and optionally the parameters of those modes, if any.
         * The returned string always begins with a '+' character. If the user has no modes set, "+" is returned.
         */
        std::string GetModeLetters(bool includeparams = false) const;

        /** 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) const;
        bool IsModeSet(const ModeHandler* mh) const;
        bool IsModeSet(const ModeHandler& mh) const { return IsModeSet(&mh); }
        bool IsModeSet(UserModeReference& moderef) const;

        /** Set a specific usermode to on or off
         * @param mh The user mode
         * @param value On or off setting of the mode
         */
        void SetMode(ModeHandler* mh, bool value);
        void SetMode(ModeHandler& mh, bool value) { SetMode(&mh, 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 HasCommandPermission(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.
         * @return True if this user has the permission in question.
         */
        virtual bool HasPrivPermission(const std::string& privstr);

        /** 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 mh Mode to check
         * @return True if the user can set or unset this mode.
         */
        virtual bool HasModePermission(const ModeHandler* mh) const;

        /** Determines whether this user can set the specified snomask.
         * @param chr The server notice mask character to look up.
         * @return True if the user can set the specified snomask; otherwise, false.
         */
        virtual bool HasSnomaskPermission(char chr) const;

        /** 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);

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

        /** Sends a server notice to this user.
         * @param text The contents of the message to send.
         */
        void WriteNotice(const std::string& text);

        /** Send a NOTICE message from the local server to the user.
         * @param text Text to send
         */
        virtual void WriteRemoteNotice(const std::string& text);

        virtual void WriteRemoteNumeric(const Numeric::Numeric& numeric);

        template <typename T1>
        void WriteRemoteNumeric(unsigned int numeric, T1 p1)
        {
                Numeric::Numeric n(numeric);
                n.push(p1);
                WriteRemoteNumeric(n);
        }

        template <typename T1, typename T2>
        void WriteRemoteNumeric(unsigned int numeric, T1 p1, T2 p2)
        {
                Numeric::Numeric n(numeric);
                n.push(p1);
                n.push(p2);
                WriteRemoteNumeric(n);
        }

        template <typename T1, typename T2, typename T3>
        void WriteRemoteNumeric(unsigned int numeric, T1 p1, T2 p2, T3 p3)
        {
                Numeric::Numeric n(numeric);
                n.push(p1);
                n.push(p2);
                n.push(p3);
                WriteRemoteNumeric(n);
        }

        template <typename T1, typename T2, typename T3, typename T4>
        void WriteRemoteNumeric(unsigned int numeric, T1 p1, T2 p2, T3 p3, T4 p4)
        {
                Numeric::Numeric n(numeric);
                n.push(p1);
                n.push(p2);
                n.push(p3);
                n.push(p4);
                WriteRemoteNumeric(n);
        }

        template <typename T1, typename T2, typename T3, typename T4, typename T5>
        void WriteRemoteNumeric(unsigned int numeric, T1 p1, T2 p2, T3 p3, T4 p4, T5 p5)
        {
                Numeric::Numeric n(numeric);
                n.push(p1);
                n.push(p2);
                n.push(p3);
                n.push(p4);
                n.push(p5);
                WriteRemoteNumeric(n);
        }

        void WriteNumeric(const Numeric::Numeric& numeric);

        template <typename T1>
        void WriteNumeric(unsigned int numeric, T1 p1)
        {
                Numeric::Numeric n(numeric);
                n.push(p1);
                WriteNumeric(n);
        }

        template <typename T1, typename T2>
        void WriteNumeric(unsigned int numeric, T1 p1, T2 p2)
        {
                Numeric::Numeric n(numeric);
                n.push(p1);
                n.push(p2);
                WriteNumeric(n);
        }

        template <typename T1, typename T2, typename T3>
        void WriteNumeric(unsigned int numeric, T1 p1, T2 p2, T3 p3)
        {
                Numeric::Numeric n(numeric);
                n.push(p1);
                n.push(p2);
                n.push(p3);
                WriteNumeric(n);
        }

        template <typename T1, typename T2, typename T3, typename T4>
        void WriteNumeric(unsigned int numeric, T1 p1, T2 p2, T3 p3, T4 p4)
        {
                Numeric::Numeric n(numeric);
                n.push(p1);
                n.push(p2);
                n.push(p3);
                n.push(p4);
                WriteNumeric(n);
        }

        template <typename T1, typename T2, typename T3, typename T4, typename T5>
        void WriteNumeric(unsigned int numeric, T1 p1, T2 p2, T3 p3, T4 p4, T5 p5)
        {
                Numeric::Numeric n(numeric);
                n.push(p1);
                n.push(p2);
                n.push(p3);
                n.push(p4);
                n.push(p5);
                WriteNumeric(n);
        }

        /** Write to all users that can see this user (including this user in the list if include_self is true), appending CR/LF
         * @param protoev Protocol event to send, may contain any number of messages.
         * @param include_self Should the message be sent back to the author?
         */
        void WriteCommonRaw(ClientProtocol::Event& protoev, bool include_self = true);

        /** Execute a function once for each local neighbor of this user. By default, the neighbors of a user are the users
         * who have at least one common channel with the user. Modules are allowed to alter the set of neighbors freely.
         * This function is used for example to send something conditionally to neighbors, or to send different messages
         * to different users depending on their oper status.
         * @param handler Function object to call, inherited from ForEachNeighborHandler.
         * @param include_self True to include this user in the set of neighbors, false otherwise.
         * Modules may override this. Has no effect if this user is not local.
         */
        void ForEachNeighbor(ForEachNeighborHandler& handler, bool include_self = true);

        /** 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);

        /** Change the displayed hostname of this user.
         * @param host The new displayed hostname of this user.
         * @return True if the hostname was changed successfully; otherwise, false.
         */
        bool ChangeDisplayedHost(const std::string& host);

        /** Change the real hostname of this user.
         * @param host The new real hostname of this user.
         * @param resetdisplay Whether to reset the display host to this value.
         */
        void ChangeRealHost(const std::string& host, bool resetdisplay);

        /** Change the ident (username) of a user.
         * ALWAYS use this function, rather than writing User::ident directly,
         * as this triggers module events allowing the change to be syncronized to
         * remote servers.
         * @param newident The new ident to set
         * @return True if the change succeeded, false if it didn't
         */
        bool ChangeIdent(const std::string& newident);

        /** Change a users realname field.
         * @param real The user's new real name
         * @return True if the change succeeded, false if otherwise
         */
        bool ChangeRealName(const std::string& real);

        /** Change a user's nick
         * @param newnick The new nick. If equal to the users uuid, the nick change always succeeds.
         * @param newts The time at which this nick change happened.
         * @return True if the change succeeded
         */
        bool ChangeNick(const std::string& newnick, time_t newts = 0);

        /** 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();

        /** Default destructor
         */
        virtual ~User();
        CullResult cull() CXX11_OVERRIDE;

        /** @copydoc Serializable::Deserialize */
        bool Deserialize(Data& data) CXX11_OVERRIDE;

        /** @copydoc Serializable::Deserialize */
        bool Serialize(Serializable::Data& data) CXX11_OVERRIDE;
};

class CoreExport UserIOHandler : public StreamSocket
{
 private:
        size_t checked_until;
 public:
        LocalUser* const user;
        UserIOHandler(LocalUser* me)
                : StreamSocket(StreamSocket::SS_USER)
                , checked_until(0)
                , user(me)
        {
        }
        void OnDataReady() CXX11_OVERRIDE;
        bool OnSetEndPoint(const irc::sockets::sockaddrs& local, const irc::sockets::sockaddrs& remote) CXX11_OVERRIDE;
        void OnError(BufferedSocketError error) CXX11_OVERRIDE;

        /** 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);

        /** Swaps the internals of this UserIOHandler with another one.
         * @param other A UserIOHandler to swap internals with.
         */
        void SwapInternals(UserIOHandler& other);
};

typedef unsigned int already_sent_t;

class CoreExport LocalUser : public User, public insp::intrusive_list_node<LocalUser>
{
        /** Add a serialized message to the send queue of the user.
         * @param serialized Bytes to add.
         */
        void Write(const ClientProtocol::SerializedMessage& serialized);

        /** Send a protocol event to the user, consisting of one or more messages.
         * @param protoev Event to send, may contain any number of messages.
         * @param msglist Message list used temporarily internally to pass to hooks and store messages
         * before Write().
         */
        void Send(ClientProtocol::Event& protoev, ClientProtocol::MessageList& msglist);

        /** Message list, can be passed to the two parameter Send().
         */
        static ClientProtocol::MessageList sendmsglist;

 public:
        LocalUser(int fd, irc::sockets::sockaddrs* client, irc::sockets::sockaddrs* server);
        LocalUser(int fd, const std::string& uuid, Serializable::Data& data);

        CullResult cull() CXX11_OVERRIDE;

        UserIOHandler eh;

        /** Serializer to use when communicating with the user
         */
        ClientProtocol::Serializer* serializer;

        /** 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;

        /** Get the connect class which this user belongs to.
         * @return A pointer to this user's connect class.
         */
        ConnectClass* GetClass() const { return MyClass; }

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

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

        /** 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;

        /** The time at which this user should be pinged next. */
        time_t nextping;

        /** 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;

        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 Z-lines 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.
         */
        void SetClass(const std::string &explicit_name = "");

        bool SetClientIP(const std::string& address) CXX11_OVERRIDE;

        void SetClientIP(const irc::sockets::sockaddrs& sa) CXX11_OVERRIDE;

        /** Send a NOTICE message from the local server to the user.
         * The message will be sent even if the user is connected to a remote server.
         * @param text Text to send
         */
        void WriteRemoteNotice(const std::string& text) CXX11_OVERRIDE;

        /** 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 HasCommandPermission(const std::string& command) CXX11_OVERRIDE;

        /** 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.
         * @return True if this user has the permission in question.
         */
        bool HasPrivPermission(const std::string& privstr) CXX11_OVERRIDE;

        /** 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 mh Mode to check
         * @return True if the user can set or unset this mode.
         */
        bool HasModePermission(const ModeHandler* mh) const CXX11_OVERRIDE;

        /** @copydoc User::HasSnomaskPermission */
        bool HasSnomaskPermission(char chr) const CXX11_OVERRIDE;

        /** Change nick to uuid, unset REG_NICK and send a nickname overruled numeric.
         * This is called when another user (either local or remote) needs the nick of this user and this user
         * isn't registered.
         */
        void OverruleNick();

        /** Send a protocol event to the user, consisting of one or more messages.
         * @param protoev Event to send, may contain any number of messages.
         */
        void Send(ClientProtocol::Event& protoev);

        /** Send a single message to the user.
         * @param protoevprov Protocol event provider.
         * @param msg Message to send.
         */
        void Send(ClientProtocol::EventProvider& protoevprov, ClientProtocol::Message& msg);

        /** @copydoc Serializable::Deserialize */
        bool Deserialize(Data& data) CXX11_OVERRIDE;

        /** @copydoc Serializable::Deserialize */
        bool Serialize(Serializable::Data& data) CXX11_OVERRIDE;
};

class RemoteUser : public User
{
 public:
        RemoteUser(const std::string& uid, Server* srv) : User(uid, srv, USERTYPE_REMOTE)
        {
        }
};

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

        FakeUser(const std::string& uid, const std::string& sname, const std::string& sdesc)
                : User(uid, new Server(uid, sname, sdesc), USERTYPE_SERVER)
        {
                nick = sname;
        }

        CullResult cull() CXX11_OVERRIDE;
        const std::string& GetFullHost() CXX11_OVERRIDE;
        const std::string& GetFullRealHost() CXX11_OVERRIDE;
};

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

inline bool User::IsModeSet(const ModeHandler* mh) const
{
        return ((mh->GetId() != ModeParser::MODEID_MAX) && (modes[mh->GetId()]));
}

inline bool User::IsModeSet(UserModeReference& moderef) const
{
        if (!moderef)
                return false;
        return IsModeSet(*moderef);
}

inline void User::SetMode(ModeHandler* mh, bool value)
{
        if (mh && mh->GetId() != ModeParser::MODEID_MAX)
                modes[mh->GetId()] = value;
}