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

/*       +------------------------------------+
 *       | Inspire Internet Relay Chat Daemon |
 *       +------------------------------------+
 *
 *  InspIRCd is copyright (C) 2002-2006 ChatSpike-Dev.
 *                       E-mail:
 *                <brain@chatspike.net>
 *                <Craig@chatspike.net>
 *     
 * Written by Craig Edwards, Craig McLure, and others.
 * This program is free but copyrighted software; see
 *            the file COPYING for details.
 *
 * ---------------------------------------------------
 */

#ifndef __USERS_H__ 
#define __USERS_H__ 

#include <string>
#include "inspircd_config.h" 
#include "socket.h"
#include "channels.h"
#include "inspstring.h"
#include "connection.h"
#include "hashcomp.h"
#include "dns.h"
#include "cull_list.h"

enum ChanStatus {
        STATUS_OP     = 4,
        STATUS_HOP    = 2,
        STATUS_VOICE  = 1,
        STATUS_NORMAL = 0
};

enum ClassTypes {
        CC_ALLOW = 0,
        CC_DENY  = 1
};

/** RFC1459 channel modes
 *  */
enum UserModes {
        UM_SERVERNOTICE = 's'-65,
        UM_WALLOPS = 'w'-65,
        UM_INVISIBLE = 'i'-65,
        UM_OPERATOR = 'o'-65,
        UM_SNOMASK = 'n'-65,
};

enum RegistrationState {
        REG_NONE = 0,           /* Has sent nothing */
        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 */
};

/** Holds a channel name to which a user has been invited.
 */
class Invited : public classbase
{
 public:
         irc::string channel;
};



class InspIRCd;

/** Derived from Resolver, and performs user forward/reverse lookups.
 */
class UserResolver : public Resolver
{
 private:
        /** User this class is 'attached' to.
         */
        userrec* bound_user;
        int bound_fd;
        bool fwd;
 public:
        UserResolver(InspIRCd* Instance, userrec* user, std::string to_resolve, bool forward);

        void OnLookupComplete(const std::string &result);
        void OnError(ResolverError e, const std::string &errormessage);
};


/** Holds information relevent to &lt;connect allow&gt; and &lt;connect deny&gt; tags in the config file.
 */
class ConnectClass : public classbase
{
 public:
        /** Type of line, either CC_ALLOW or CC_DENY
         */
        char type;
        /** Max time to register the connection in seconds
         */
        int registration_timeout;
        /** Number of lines in buffer before excess flood is triggered
         */
        int flood;
        /** Host mask for this line
         */
        std::string host;
        /** Number of seconds between pings for this line
         */
        int pingtime;
        /** (Optional) Password for this line
         */
        std::string pass;

        /** Threshold value for flood disconnect
         */
        int threshold;

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

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

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

        /** Global max when connecting by this connection class
         */
        long maxglobal;
        
        ConnectClass() : registration_timeout(0), flood(0), host(""), pingtime(0), pass(""), threshold(0), sendqmax(0), recvqmax(0)
        {
        }
};

/** Holds a complete list of all channels to which a user has been invited and has not yet joined.
 */
typedef std::vector<Invited> 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::vector<ucrec*> UserChanList;

/** 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. Use the FindNick method of the InspIRCd class to locate a specific user
 * by nickname, or the FindDescriptor method of the InspIRCd class to find a specific user by their
 * file descriptor value.
 */
class userrec : public connection
{
 private:
        /** Pointer to creator.
         * This is required to make use of core functions
         * from within the userrec class.
         */
        InspIRCd* ServerInstance;

        /** 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;
 public:
        /** Resolvers for looking up this users IP address
         * This will occur if and when res_reverse completes.
         * When this class completes its lookup, userrec::dns_done
         * will be set from false to true.
         */
        UserResolver* res_forward;

        /** Resolvers for looking up this users hostname
         * This is instantiated by userrec::StartDNSLookup(),
         * and on success, instantiates userrec::res_reverse.
         */
        UserResolver* res_reverse;

        /** Stored reverse lookup from res_forward
         */
        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 userrec::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.
         */
        char nick[NICKMAX];
        
        /** The users ident reply.
         * Two characters are added to the user-defined limit to compensate for the tilde etc.
         */
        char ident[IDENTMAX+2];

        /** The host displayed to non-opers (used for cloaking etc).
         * This usually matches the value of userrec::host.
         */
        char dhost[65];
        
        /** The users full name (GECOS).
         */
        char fullname[MAXGECOS+1];
        
        /** The user's mode list.
         * This is NOT a null terminated string! In the 1.1 version of InspIRCd
         * this is an array of values in a similar way to channel modes.
         * A value of 1 in field (modeletter-65) indicates that the mode is
         * set, for example, to work out if mode +s is set, we  check the field
         * userrec::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.
         */
        char modes[64];

        /** What snomasks are set on this user.
         * This functions the same as the above modes.
         */
        char snomasks[64];

        /** 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.
         */
        char awaymsg[MAXAWAY+1];
        
        /** Number of lines the user can place into the buffer
         * (up to the global NetBufferSize bytes) before they
         * are disconnected for excess flood
         */
        int flood;
        
        /** Number of seconds this user is given to send USER/NICK
         * If they do not send their details in this time limit they
         * will be disconnected
         */
        unsigned int timeout;
        
        /** 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.
         */
        char oper[NICKMAX];

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

        /** Number of seconds between PINGs for this user (set from &lt;connect:allow&gt; tag
         */
        unsigned int pingmax;

        /** 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.
         */
        char password[64];

        /** 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;

        /** Flood counters - lines received
         */
        int lines_in;

        /** Flood counters - time lines_in is due to be reset
         */
        time_t reset_due;

        /** Flood counters - Highest value lines_in may reach before the user gets disconnected
         */
        long threshold;

        /** IPV4 or IPV6 ip address
         */
        sockaddr* ip;

        /** Initialize the clients sockaddr
         * @param protocol_family The protocol family of the IP address, AF_INET or AF_INET6
         * @param ip A human-readable IP address for this user matching the protcol_family
         * @param port The port number of this user or zero for a remote user
         */
        void SetSockAddr(int protocol_family, const char* ip, int port);

        /** Get port number from sockaddr
         * @return The port number of this user.
         */
        int GetPort();

        /** Get protocol family from sockaddr
         * @return The protocol family of this user, either AF_INET or AF_INET6
         */
        int GetProtocolFamily();

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

        /** Get IP string from sockaddr, using caller-specified buffer
         * @param buf A buffer to use
         * @return The IP string
         */
        const char* GetIPString(char* buf);

        /* Write error string
         */
        std::string WriteError;

        /** Maximum size this user's sendq can become
         */
        long sendqmax;

        /** Maximum size this user's recvq can become
         */
        long recvqmax;

        /** Default constructor
         * @throw Nothing at present
         */
        userrec(InspIRCd* Instance);
        
        /** 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 char* 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 char* GetFullRealHost();

        /** 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 userrec::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();

        /** 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(irc::string &channel);
        
        /** Adds a channel to a users invite list (invites them to a channel)
         * @param channel A channel name to add
         */
        virtual void InviteTo(irc::string &channel);
        
        /** 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(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 userrec::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);

        /** 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(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();

        /** Sets the write error for a connection. This is done because the actual disconnect
         * of a client may occur at an inopportune time such as half way through /LIST output.
         * The WriteErrors of clients are checked at a more ideal time (in the mainloop) and
         * errored clients purged.
         * @param error The error string to set.
         */
        void SetWriteError(const std::string &error);

        /** Returns the write error which last occured on this connection or an empty string
         * if none occured.
         * @return The error string which has occured for this user
         */
        const char* GetWriteError();

        /** 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, SetWriteError() will be called to set the users error string to
         * "SendQ exceeded", 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 host.
         * Takes a buffer to use and fills the given buffer with the host in the format nick!user@host
         * @param Buffer to fill with host information
         */
        void MakeHost(char* nhost);

        /** 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();

        /** Disconnect a user gracefully
         * @param user The user to remove
         * @param r The quit reason
         * @return Although this function has no return type, on exit the user provided will no longer exist.
         */
        static void QuitUser(InspIRCd* Instance, userrec *user, const std::string &r);

        /** 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);

        /** Use this method to fully connect a user.
         * This will send the message of the day, check G/K/E lines, etc.
         * @param Goners If the user is disconnected by this method call, the
         * value of 'this' will be pushed onto this CullList. This is used by
         * the core to connect many users in rapid succession without invalidating
         * iterators.
         * @param Goners a CullList to use for failed connections
         */
        void FullConnect(CullList* Goners);

        /** 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 userrec in hash (usually 'this')
         */
        userrec* 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);

        /** Add a client to the system.
         * This will create a new userrec, insert it into the user_hash,
         * initialize it as not yet registered, and add it to the socket engine.
         * @param Instance a pointer to the server instance
         * @param socket The socket id (file descriptor) this user is on
         * @param port The port number this user connected on
         * @param iscached This variable is reserved for future use
         * @param ip The IP address of the user
         * @return This function has no return value, but a call to AddClient may remove the user.
         */
        static void AddClient(InspIRCd* Instance, int socket, int port, bool iscached, insp_inaddr ip);

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

        /** Return the number of global clones of this user
         * @return The global clone count of this user
         */
        long GlobalCloneCount();

        /** Return the number of local clones of this user
         * @return The local clone count of this user
         */
        long LocalCloneCount();

        /** Write text to this user, appending CR/LF.
         * @param text A std::string to send to the user
         */
        void Write(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, ...);

        /** 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, ...);

        /** 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(userrec *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(userrec *user, const char* text, ...);

        /** 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(userrec *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(userrec *dest, const char *data, ...);

        /** 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, ...);

        /** 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, ...);

        /** 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 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, ...);

        /** 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(userrec *other);

        /** Change the displayed host of a user.
         * ALWAYS use this function, rather than writing userrec::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 userrec::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 userrec::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);

        /** Return the total number of channels this user is on.
         * @return The number of channels the user is on
         */
        int CountChannels();

        /** Send a notice to all local users from this user
         * @param text The text format string to send
         * @param ... Format arguments
         */
        void NoticeAll(char* text, ...);

        /** 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(userrec* 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 userrec::ChannelList()
         */
        void SplitChanList(userrec* 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 matches this user's host or IP address
         * @return A reference to this user's connect class
         */
        ConnectClass& GetClass();

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

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

        /** Handle socket event.
         * From EventHandler class.
         */
        void HandleEvent(EventType et);

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


namespace irc
{
        /** Holds whowas related functions and classes
         */
        namespace whowas
        {

                /** Used to hold WHOWAS information
                 */
                class WhoWasGroup : public classbase
                {
                 public:
                        /** Real host
                         */
                        char* host;
                        /** Displayed host
                         */
                        char* dhost;
                        /** Ident
                         */
                        char* ident;
                        /** Server name
                         */
                        const char* server;
                        /** Fullname (GECOS)
                         */
                        char* gecos;
                        /** Signon time
                         */
                        time_t signon;
        
                        /** Initialize this WhoQasFroup with a user
                         */
                        WhoWasGroup(userrec* user);
                        /** Destructor
                         */
                        ~WhoWasGroup();
                };

                /** A group of users related by nickname
                 */
                typedef std::deque<WhoWasGroup*> whowas_set;

                /** Sets of users in the whowas system
                 */
                typedef std::map<irc::string,whowas_set*> whowas_users;

                /** Called every hour by the core to remove expired entries
                 */
                void MaintainWhoWas(time_t TIME);
        };
};

/* Configuration callbacks */
class ServerConfig;
bool InitTypes(ServerConfig* conf, const char* tag);
bool InitClasses(ServerConfig* conf, const char* tag);
bool DoType(ServerConfig* conf, const char* tag, char** entries, void** values, int* types);
bool DoClass(ServerConfig* conf, const char* tag, char** entries, void** values, int* types);
bool DoneClassesAndTypes(ServerConfig* conf, const char* tag);

#endif