Tons more sanity checks and length checks

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

/*



*/


#ifndef __PLUGIN_H
#define __PLUGIN_H

#define DEBUG 10
#define VERBOSE 20
#define DEFAULT 30
#define SPARSE 40
#define NONE 50

#define MT_CHANNEL 1
#define MT_CLIENT 2
#define MT_SERVER 3

#include "dynamic.h"
#include "base.h"
#include "ctables.h"
#include <string>
#include <deque>

/** Low level definition of a FileReader classes file cache area
 */
typedef std::deque<std::string> file_cache;
typedef file_cache string_list;

// This #define allows us to call a method in all
// loaded modules in a readable simple way, e.g.:
// 'FOREACH_MOD OnConnect(user);'

#define FOREACH_MOD for (int i = 0; i <= MODCOUNT; i++) modules[i]->

// This define is similar to the one above but returns a result in MOD_RESULT.
// The first module to return a nonzero result is the value to be accepted,
// and any modules after are ignored.

// *********************************************************************************************

#define FOREACH_RESULT(x) { MOD_RESULT = 0; \
                        for (int i = 0; i <= MODCOUNT; i++) { \
                        int res = modules[i]->x ; \
                        if (res) { \
                                MOD_RESULT = res; \
                                break; \
                        } \
                } \
   } 
   
// *********************************************************************************************

extern void createcommand(char* cmd, handlerfunc f, char flags, int minparams);
extern void server_mode(char **parameters, int pcnt, userrec *user);

// class Version holds the version information of a Module, returned
// by Module::GetVersion (thanks RD)

/** Holds a module's Version information
 *  The four members (set by the constructor only) indicate details as to the version number
 *  of a module. A class of type Version is returned by the GetVersion method of the Module class.
 */
class Version : public classbase
{
 public:
         const int Major, Minor, Revision, Build;
         Version(int major, int minor, int revision, int build);
};

/** Holds /ADMIN data
 *  This class contains the admin details of the local server. It is constructed by class Server,
 *  and has three read-only values, Name, Email and Nick that contain the specified values for the
 *  server where the module is running.
 */
class Admin : public classbase
{
 public:
         const std::string Name, Email, Nick;
         Admin(std::string name, std::string email, std::string nick);
};

/** Base class for all InspIRCd modules
 *  This class is the base class for InspIRCd modules. All modules must inherit from this class,
 *  its methods will be called when irc server events occur. class inherited from module must be
 *  instantiated by the ModuleFactory class (see relevent section) for the plugin to be initialised.
 */
class Module : public classbase
{
 public:

        /** Default constructor
         * creates a module class
         */
        Module();

        /** Default destructor
         * destroys a module class
         */
        virtual ~Module();

        /** Returns the version number of a Module.
         * The method should return a Version object with its version information assigned via
         * Version::Version
         */
        virtual Version GetVersion();

        /** Called when a user connects.
         * The details of the connecting user are available to you in the parameter userrec *user
         */
        virtual void OnUserConnect(userrec* user);

        /** Called when a user quits.
         * The details of the exiting user are available to you in the parameter userrec *user
         */
        virtual void OnUserQuit(userrec* user);

        /** Called when a user joins a channel.
         * The details of the joining user are available to you in the parameter userrec *user,
         * and the details of the channel they have joined is available in the variable chanrec *channel
         */
        virtual void OnUserJoin(userrec* user, chanrec* channel);

        /** Called when a user parts a channel.
         * The details of the leaving user are available to you in the parameter userrec *user,
         * and the details of the channel they have left is available in the variable chanrec *channel
         */
        virtual void OnUserPart(userrec* user, chanrec* channel);

        /** Called before a packet is transmitted across the irc network between two irc servers.
         * The packet is represented as a char*, as it should be regarded as a buffer, and not a string.
         * This allows you to easily represent it in the correct ways to implement encryption, compression,
         * digital signatures and anything else you may want to add. This should be regarded as a pre-processor
         * and will be called before ANY other operations within the ircd core program.
         */
        virtual void OnPacketTransmit(char *p);

        /** Called after a packet is received from another irc server.
         * The packet is represented as a char*, as it should be regarded as a buffer, and not a string.
         * This allows you to easily represent it in the correct ways to implement encryption, compression,
         * digital signatures and anything else you may want to add. This should be regarded as a pre-processor
         * and will be called immediately after the packet is received but before any other operations with the
         * core of the ircd.
         */
        virtual void OnPacketReceive(char *p);

        /** Called on rehash.
         * This method is called prior to a /REHASH or when a SIGHUP is received from the operating
         * system. You should use it to reload any files so that your module keeps in step with the
         * rest of the application.
         */
        virtual void OnRehash();

        /** Called when a raw command is transmitted or received.
         * This method is the lowest level of handler available to a module. It will be called with raw
         * data which is passing through a connected socket. If you wish, you may munge this data by changing
         * the string parameter "raw". If you do this, after your function exits it will immediately be
         * cut down to 510 characters plus a carriage return and linefeed.
         */
        virtual void OnServerRaw(std::string &raw, bool inbound);

        /** Called whenever an extended mode is to be processed.
         * The type parameter is MT_SERVER, MT_CLIENT or MT_CHANNEL, dependent on where the mode is being
         * changed. mode_on is set when the mode is being set, in which case params contains a list of
         * parameters for the mode as strings. If mode_on is false, the mode is being removed, and parameters
         * may contain the parameters for the mode, dependent on wether they were defined when a mode handler
         * was set up with Server::AddExtendedMode
         * If the mode is not a channel mode, chanrec* chan is null, and should not be read from or written to.
         */
        virtual bool OnExtendedMode(userrec* user, chanrec* chan, char modechar, int type, bool mode_on, string_list &params);
        
        /** Called whenever a user is about to join a channel, before any processing is done.
         * Returning any nonzero value from this function stops the process immediately, causing no
         * output to be sent to the user by the core. If you do this you must produce your own numerics,
         * notices etc. This is useful for modules which may want to mimic +b, +k, +l etc.
         *
         * IMPORTANT NOTE!
         *
         * If the user joins a NEW channel which does not exist yet, OnUserPreJoin will be called BEFORE the channel
         * record is created. This will cause chanrec* chan to be NULL. There is very little you can do in form of
         * processing on the actual channel record at this point, however the channel NAME will still be passed in
         * char* cname, so that you could for example implement a channel blacklist or whitelist, etc.
         */
        virtual int Module::OnUserPreJoin(userrec* user, chanrec* chan, char* cname);
 
};


/** Allows server output and query functions
 * This class contains methods which allow a module to query the state of the irc server, and produce
 * output to users and other servers. All modules should instantiate at least one copy of this class,
 * and use its member functions to perform their tasks.
 */
class Server : public classbase
{
 public:
        /** Default constructor.
         * Creates a Server object.
         */
        Server();
        /** Default destructor.
         * Destroys a Server object.
         */
        virtual ~Server();

        /** Sends text to all opers.
         * This method sends a server notice to all opers with the usermode +s.
         */
        virtual void SendOpers(std::string s);
        /** Writes a log string.
         * This method writes a line of text to the log. If the level given is lower than the
         * level given in the configuration, this command has no effect.
         */
        virtual void Log(int level, std::string s);
        /** Sends a line of text down a TCP/IP socket.
         * This method writes a line of text to an established socket, cutting it to 510 characters
         * plus a carriage return and linefeed if required.
         */
        virtual void Send(int Socket, std::string s);
        /** Sends text from the server to a socket.
         * This method writes a line of text to an established socket, with the servername prepended
         * as used by numerics (see RFC 1459)
         */
        virtual void SendServ(int Socket, std::string s);
        /** Sends text from a user to a socket.
         * This method writes a line of text to an established socket, with the given user's nick/ident
         * /host combination prepended, as used in PRIVSG etc commands (see RFC 1459)
         */
        virtual void SendFrom(int Socket, userrec* User, std::string s);
        /** Sends text from a user to another user.
         * This method writes a line of text to a user, with a user's nick/ident
         * /host combination prepended, as used in PRIVMSG etc commands (see RFC 1459)
         */
        virtual void SendTo(userrec* Source, userrec* Dest, std::string s);
        /** Sends text from a user to a channel (mulicast).
         * This method writes a line of text to a channel, with the given user's nick/ident
         * /host combination prepended, as used in PRIVMSG etc commands (see RFC 1459). If the
         * IncludeSender flag is set, then the text is also sent back to the user from which
         * it originated, as seen in MODE (see RFC 1459).
         */
        virtual void SendChannel(userrec* User, chanrec* Channel, std::string s,bool IncludeSender);
        /** Returns true if two users share a common channel.
         * This method is used internally by the NICK and QUIT commands, and the Server::SendCommon
         * method.
         */
        virtual bool CommonChannels(userrec* u1, userrec* u2);
        /** Sends text from a user to one or more channels (mulicast).
         * This method writes a line of text to all users which share a common channel with a given     
         * user, with the user's nick/ident/host combination prepended, as used in PRIVMSG etc
         * commands (see RFC 1459). If the IncludeSender flag is set, then the text is also sent
         * back to the user from which it originated, as seen in NICK (see RFC 1459). Otherwise, it
         * is only sent to the other recipients, as seen in QUIT.
         */
        virtual void SendCommon(userrec* User, std::string text,bool IncludeSender);
        /** Sends a WALLOPS message.
         * This method writes a WALLOPS message to all users with the +w flag, originating from the
         * specified user.
         */
        virtual void SendWallops(userrec* User, std::string text);

        /** Returns true if a nick is valid.
         * Nicks for unregistered connections will return false.
         */
        virtual bool IsNick(std::string nick);
        /** Attempts to look up a nick and return a pointer to it.
         * This function will return NULL if the nick does not exist.
         */
        virtual userrec* FindNick(std::string nick);
        /** Attempts to look up a channel and return a pointer to it.
         * This function will return NULL if the channel does not exist.
         */
        virtual chanrec* FindChannel(std::string channel);
        /** Attempts to look up a user's privilages on a channel.
         * This function will return a string containing either @, %, +, or an empty string,
         * representing the user's privilages upon the channel you specify.
         */
        virtual std::string ChanMode(userrec* User, chanrec* Chan);
        /** Returns the server name of the server where the module is loaded.
         */
        virtual std::string GetServerName();
        /** Returns the network name, global to all linked servers.
         */
        virtual std::string GetNetworkName();
        /** Returns the information of the server as returned by the /ADMIN command.
         * See the Admin class for further information of the return value. The members
         * Admin::Nick, Admin::Email and Admin::Name contain the information for the
         * server where the module is loaded.
         */
        virtual Admin GetAdmin();
        /** Adds an extended mode letter which is parsed by a module
         * This allows modules to add extra mode letters, e.g. +x for hostcloak.
         * the "type" parameter is either MT_CHANNEL, MT_CLIENT, or MT_SERVER, to
         * indicate wether the mode is a channel mode, a client mode, or a server mode.
         * default_on is true if the mode is to be applied to default connections.
         * params_when_on is the number of modes to expect when the mode is turned on
         * (for type MT_CHANNEL only), e.g. with mode +b, this would have a value of 1.
         * the params_when_off value has a similar value to params_when_on, except it indicates
         * the number of parameters to expect when the mode is disabled. Modes which act in a similar
         * way to channel mode +l (e.g. require a parameter to enable, but not to disable) should
         * use this parameter. The function returns false if the mode is unavailable, and will not
         * attempt to allocate another character, as this will confuse users. This also means that
         * as only one module can claim a specific mode character, the core does not need to keep track
         * of which modules own which modes, which speeds up operation of the server. In this version,
         * a mode can have at most one parameter, attempting to use more parameters will have undefined
         * effects.
         */
        virtual bool AddExtendedMode(char modechar, int type, bool default_on, int params_when_on, int params_when_off);

        /** Adds a command to the command table.
         * This allows modules to add extra commands into the command table. You must place a function within your
         * module which is is of type handlerfunc:
         * 
         * typedef void (handlerfunc) (char**, int, userrec*);
         * ...
         * void handle_kill(char **parameters, int pcnt, userrec *user)
         *
         * When the command is typed, the parameters will be placed into the parameters array (similar to argv) and
         * the parameter count will be placed into pcnt (similar to argv). There will never be any less parameters
         * than the 'minparams' value you specified when creating the command. The *user parameter is the class of
         * the user which caused the command to trigger, who will always have the flag you specified in 'flags' when
         * creating the initial command. For example to create an oper only command create the commands with flags='o'.
         */
        virtual void AddCommand(char* cmd, handlerfunc f, char flags, int minparams);
         
        /** Sends a servermode.
         * you must format the parameters array with the target, modes and parameters for those modes.
         *
         * For example:
         *
         * char *modes[3];
         *
         * modes[0] = ChannelName;
         *
         * modes[1] = "+o";
         *
         * modes[2] = user->nick;
         *
         * Srv->SendMode(modes,3,user);
         *
         * The modes will originate from the server where the command was issued, however responses (e.g. numerics)
         * will be sent to the user you provide as the third parameter.
         * You must be sure to get the number of parameters correct in the pcnt parameter otherwise you could leave
         * your server in an unstable state!
         */

        virtual void SendMode(char **parameters, int pcnt, userrec *user);
};

/** Allows reading of values from configuration files
 * This class allows a module to read from either the main configuration file (inspircd.conf) or from
 * a module-specified configuration file. It may either be instantiated with one parameter or none.
 * Constructing the class using one parameter allows you to specify a path to your own configuration
 * file, otherwise, inspircd.conf is read.
 */
class ConfigReader : public classbase
{
  protected:
        /** The filename of the configuration file, as set by the constructor.
         */
        std::string fname;
  public:
        /** Default constructor.
         * This constructor initialises the ConfigReader class to read the inspircd.conf file
         * as specified when running ./configure.
         */
        ConfigReader();                 // default constructor reads ircd.conf
        /** Overloaded constructor.
         * This constructor initialises the ConfigReader class to read a user-specified config file
         */
        ConfigReader(std::string filename);     // read a module-specific config
        /** Default destructor.
         * This method destroys the ConfigReader class.
         */
        ~ConfigReader();
        /** Retrieves a value from the config file.
         * This method retrieves a value from the config file. Where multiple copies of the tag
         * exist in the config file, index indicates which of the values to retrieve.
         */
        std::string ReadValue(std::string tag, std::string name, int index);
        /** Counts the number of times a given tag appears in the config file.
         * This method counts the number of times a tag appears in a config file, for use where
         * there are several tags of the same kind, e.g. with opers and connect types. It can be
         * used with the index value of ConfigReader::ReadValue to loop through all copies of a
         * multiple instance tag.
         */
        int Enumerate(std::string tag);
        /** Returns true if a config file is valid.
         * This method is unimplemented and will always return true.
         */
        bool Verify();
};



/** Caches a text file into memory and can be used to retrieve lines from it.
 * This class contains methods for read-only manipulation of a text file in memory.
 * Either use the constructor type with one parameter to load a file into memory
 * at construction, or use the LoadFile method to load a file.
 */
class FileReader : public classbase
{
 file_cache fc;
 public:
         /** Default constructor.
          * This method does not load any file into memory, you must use the LoadFile method
          * after constructing the class this way.
          */
         FileReader();
         /** Secondary constructor.
          * This method initialises the class with a file loaded into it ready for GetLine and
          * and other methods to be called. If the file could not be loaded, FileReader::FileSize
          * returns 0.
          */
         FileReader(std::string filename);
         /** Default destructor.
          * This deletes the memory allocated to the file.
          */
         ~FileReader();
         /** Used to load a file.
          * This method loads a file into the class ready for GetLine and
          * and other methods to be called. If the file could not be loaded, FileReader::FileSize
          * returns 0.
          */
         void LoadFile(std::string filename);
         /** Retrieve one line from the file.
          * This method retrieves one line from the text file. If an empty non-NULL string is returned,
          * the index was out of bounds, or the line had no data on it.
          */
         bool Exists();
         std::string GetLine(int x);
         /** Returns the size of the file in lines.
          * This method returns the number of lines in the read file. If it is 0, no lines have been
          * read into memory, either because the file is empty or it does not exist, or cannot be
          * opened due to permission problems.
          */
         int FileSize();
};


/** Instantiates classes inherited from Module
 * This class creates a class inherited from type Module, using new. This is to allow for modules
 * to create many different variants of Module, dependent on architecture, configuration, etc.
 * In most cases, the simple class shown in the example module m_foobar.so will suffice for most
 * modules.
 */
class ModuleFactory : public classbase
{
 public:
        ModuleFactory() { }
        virtual ~ModuleFactory() { }
        /** Creates a new module.
         * Your inherited class of ModuleFactory must return a pointer to your Module class
         * using this method.
         */
        virtual Module * CreateModule() = 0;
};


typedef DLLFactory<ModuleFactory> ircd_module;

#endif