Eggdrop Module Information Last revised: Jul 25, 2016

Eggdrop Module Information

The purpose of this document is to show you how to download, install, create, and submit modules.

What are modules?

Modules are portions of code which are loaded separately to the bot itself and provide extra services. For example, the filesys module provides the entire file system.

Why use modules?

Modules allow C coders to add their own enhancements to the bot while keeping them optional and without increasing the size of the Eggdrop core.

How to install a module

Please note that these are only basic instructions for compiling and installing a module. Please read any and all directions included with the module you wish to install.

  1. Download and un-tar the Eggdrop source code.
  2. Place the new module in its own directory (in the format of (modulename).mod) in src/mod.
  3. Run ./configure (from eggdrop1.8.x/).
  4. Type 'make config' or 'make iconfig'.
  5. Type 'make'.
  6. Copy the compiled module file (modulename.so) into your bot's modules folder.
  7. Add 'loadmodule modulename' to your eggdrop.conf file (do not add the .so suffix).
  8. Rehash or restart your bot.

To view your currently loaded modules, type '.module'.

Modules included with Eggdrop

Assoc Module
This module provides assoc support, i.e. naming channels on the botnet.
Blowfish Module
Eggdrop can encrypt your userfile, so users can have secure passwords. Please note that when you change your encryption method later (i.e. using other modules like a md5 module), you can't use your current userfile anymore. Eggdrop will not start without an encryption module.
Channels Module
This module provides channel related support for the bot. Without it, you won't be able to make the bot join a channel or save channel specific userfile information.
Compress Module
This module provides provides support for file compression. This allows the bot to transfer compressed user files and, therefore, save a significant amount of bandwidth.
Console Module
This module provides storage of console settings when you exit the bot or type .store on the partyline.
CTCP Module
This module provides the normal ctcp replies that you'd expect. Without it loaded, CTCP CHAT will not work.
DNS Module
This module provides asynchronous dns support. This will avoid long periods where the bot just hangs there, waiting for a hostname to resolve, which will often let it timeout on all other connections.
Filesys Module
This module provides an area within the bot where users can store and manage files. With this module, the bot is usable as a file server.
IRC Module
This module provides basic IRC support for your bot. You have to load this if you want your bot to come on IRC.
Notes Module
This module provides support for storing of notes for users from each other. Note sending between currently online users is supported in the core, this is only for storing the notes for later retrieval.
Seen Module
This module provides very basic seen commands via msg, on channel or via dcc. This module works only for users in the bot's userlist. If you are looking for a better and more advanced seen module, try the gseen module by G'Quann. You can find it at http://www.kreativrauschen.com/gseen.mod/.
Server Module
This module provides the core server support. You have to load this if you want your bot to come on IRC. Not loading this is equivalent to the old NO_IRC define.
Share Module
This module provides userfile sharing support between two directly linked bots.
Transfer Module
The transfer module provides DCC SEND/GET support and userfile transfer support for userfile sharing.
Uptime Module
This module reports uptime statistics to the uptime contest web site at http://uptime.eggheads.org. Go look and see what your uptime is! It takes about 9 hours to show up, so if your bot isn't listed, try again later. See doc/settings/mod.uptime for more information, including details on what information is sent to the uptime server.
Woobie Module
This is for demonstrative purposes only. If you are looking for starting point in writing modules, woobie is the right thing.

Programming modules

WARNING: This section is very likely to be out of date.

Note: This is for a simple module of 1 source file. If you're doing a multiple source file module, you shouldn't need to read this anyway.

  1. Create a src/mod/MODULE.mod directory in your Eggdrop directory (where MODULE is the module name) and cd to it.

  2. Copy the file 'Makefile' from src/mod/woobie.mod and replace all occurrences of 'woobie' with your module name. This should ensure that your module gets compiled.

  3. Next, you want to create a file called MODULE.c (MODULE is the module name again).

  4. You MUST include the following in your source code:

    #define MODULE_NAME "module-name"
    

This should be defined to the same name you will be using when you load your module.

#define MAKING_MODULENAME

MODULENAME is the name of your module (MODULE_NAME), but in all caps.

#include "../module.h"

This provides access to Eggdrop's global function table. Examine src/mod/module.h closely to find a list of functions available.

#include any other standard c header files you might need.

Note that stdio.h, string.h, stdlib.h, and sys/types.h are already included.

Function *global;

This variable provides access to all the Eggdrop functions; without it, you can't call any Eggdrop functions (the module won't even load).

Module requirements

In most modules, all functions/variables (except global and MODULE_start) should be static. This will drastically reduce the size of modules on decent systems.

Throughout this step, MODULE refers to the module name. Note that
"MODULE_NAME" should literally be "MODULE_NAME".

MODULE_start

char *MODULE_start(Function *func_table)

This function is called when the module is first loaded. There are
several things that need to be done in this function
global = func_table;

This allows you to make calls to the global function table.
module_register(MODULE_NAME, MODULE_table, MAJOR, MINOR);

This records details about the module for other modules and Eggdrop
itself to access. MAJOR and MINOR are ints, where MAJOR is the
module's major version number and MINOR is a minor version number.
MODULE_table is a function table (see below).
module_depend(MODULE_NAME, "another-module", MAJOR, MINOR);

This lets Eggdrop know that your module NEEDS "another-module" of
major version 'MAJOR' and at least minor version 'MINOR' to run,
and hence should try to load it if it's not already loaded. This
will return 1 on success, or 0 if it can't be done (at which stage
you should return an error).

Any other initialization stuff you desire should also be included in this function. See below for various things you can do.

You also will need to return a value. Returning NULL implies the module loaded successfully. Returning a non-NULL STRING is an error message. The module (and any other dependant modules) will stop loading and an error will be returned.

MODULE_table

static Function *MODULE_table = {
       MODULE_start,
       MODULE_close,
       MODULE_expmem,
       MODULE_report,
       any_other_functions,
       you_want_to_export
};

This is a table of functions which any other module can access. The
first 4 functions are FIXED. You MUST have them; they provide important
module information.

MODULE_close ()

static char *MODULE_close ()

This is called when the module is unloaded. Apart from tidying any
relevant data (I suggest you be thorough, we don't want any trailing
garbage from modules), you MUST do the following:
module_undepend(MODULE_NAME);

This lets Eggdrop know your module no longer depends on any other
modules.

Return a value. NULL implies success; any non-NULL STRING implies
that the module cannot be unloaded for some reason, and hence the
bot should not unload it (see the blowfish module for an example).

MODULE_expmem

static int MODULE_expmem ()

This should tally all memory you allocate/deallocate within the module
(using nmalloc, nfree, etc) in bytes. It's used by memory debugging to
track memory faults, and it is used by .status to total up memory usage.

MODULE_report

static void MODULE_report (int idx)

This should provide a relatively short report of the module's status
(for the module and status commands).

These functions are available to modules. MANY more available functions can be found in src/mod/module.h.

Additional functions

void *nmalloc(int j);

This allocates j bytes of memory.
void nfree(void *a);

This frees an nmalloc'd block of memory.
Context;

Actually a macro -- records the current position in execution (for
debugging). Using Context is no longer recommended, because it uses
too many resources and a core file provides much more information.
void dprintf(int idx, char *format, ...)

This acts like a normal printf() function, but it outputs to
log/socket/idx.

idx is a normal dcc idx, or if < 0 is a sock number.

Other destinations:
  DP_LOG    - send to log file
  DP_STDOUT - send to stdout
  DP_MODE   - send via mode queue to the server
  DP_SERVER - send via normal queue to the server
  DP_HELP   - send via help queue to server
const module_entry *module_find(char *module_name, int major, int minor);

  Searches for a loaded module (matching major, >= minor), and returns
  info about it.

  Members of module_entry:
    char *name;      - module name
    int major;       - real major version
    int minor;       - real minor version
    Function *funcs; - function table (see above)

void module_rename(char *old_module_name, char *new_module_name)

  This renames a module frim old_module_name to new_module_name.

void add_hook(int hook_num, Function *funcs)
void del_hook(int hook_num, Function *funcs)

 These are used for adding or removing hooks to/from Eggdrop code that
 are triggered on various events. Valid hooks are:
   HOOK_SECONDLY   - called every second
   HOOK_MINUTELY   - called every minute
   HOOK_5MINUTELY  - called every 5 minutes
   HOOK_HOURLY     - called every hour (hourly-updates minutes past)
   HOOK_DAILY      - called when the logfiles are switched

   HOOK_READ_USERFILE - called when the userfile is read
   HOOK_USERFILE      - called when the userfile is written
   HOOK_PRE_REHASH    - called just before a rehash
   HOOK_REHASH        - called just after a rehash
   HOOK_IDLE          - called whenever the dcc connections have been
                        idle for a whole second
   HOOK_BACKUP        - called when a user/channel file backup is done
   HOOK_LOADED        - called when Eggdrop is first loaded
   HOOK_DIE           - called when Eggdrop is about to die

char *module_unload (char *module_name);
char *module_load (char *module_name);

  Tries to load or unload the specified module; returns 0 on success, or
  an error message.

void add_tcl_commands(tcl_cmds *tab);
void rem_tcl_commands(tcl_cmds *tab);

  Provides a quick way to create and remove a table of Tcl commands. The
  table is in the form of:

    {char *func_name, Function *function_to_call}

  Use { NULL, NULL } to indicate the end of the list.

void add_tcl_ints(tcl_ints *);
void rem_tcl_ints(tcl_ints *);

  Provides a quick way to create and remove a table of links from C
  int variables to Tcl variables (add_tcl_ints checks to see if the Tcl
  variable exists and copies it over the C one). The format of table is:

    {char *variable_name, int *variable, int readonly}

  Use {NULL, NULL, 0} to indicate the end of the list.

void add_tcl_strings(tcl_strings *);
void rem_tcl_strings(tcl_strings *);

  Provides a quick way to create and remove a table of links from C
  string variables to Tcl variables (add_tcl_ints checks to see if the
  Tcl variable exists and copies it over the C one). The format of table
  is:

    {char *variable_name, char *string, int length, int flags}

  Use {NULL, NULL, 0, 0} to indicate the end of the list. Use 0 for
  length if you want a const string. Use STR_DIR for flags if you want a
  '/' constantly appended; use STR_PROTECT if you want the variable set
  in the config file, but not during normal usage.

void add_builtins(p_tcl_hash_list table, cmd_t *cc);
void rem_builtins(p_tcl_hash_list table, cmd_t *cc);

  This adds binds to one of Eggdrop's bind tables. The format of the
  table is:

    {char *command, char *flags, Function *function, char *displayname}

  Use {NULL, NULL, NULL, NULL} to indicate the end of the list.

  This works EXACTLY like the Tcl 'bind' command. displayname is what Tcl
  sees this function's proc name as (in .binds all).

  function is called with exactly the same args as a Tcl binding is with
  type conversion taken into account (e.g. idx's are ints). Return values
  are much the same as Tcl bindings. Use int 0/1 for those which require
  0/1, or char * for those which require a string (auch as filt). Return
  nothing if no return value is required.

void putlog (int logmode, char *channel, char *format, ...)

  Adds text to a logfile (determined by logmode and channel). This text
  will also output to any users' consoles if they have the specified
  console mode enabled.

What to do with a module?

If you have written a module and feel that you wish to share it with the rest of the Eggdrop community, upload it to the incoming directory on incoming.eggheads.org (/incoming/modules/1.8). Place a nice descriptive text (modulename.desc) with it, and it'll make its way to the modules directory on ftp.eggheads.org. Don't forget to mention in your text file which version Eggdrop the module is written for.

Copyright (C) 1999 - 2017 Eggheads Development Team