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Revision 1.2 - (hide annotations) (download)
Sat Oct 9 15:46:33 1999 UTC (20 years ago) by fabian
Branch: MAIN
CVS Tags: eggdrop105020
Changes since 1.1: +3 -1 lines
all changes to the 1.3 tree merged with 1.4

1 segfault 1.1 ### Module information (not finished yet, but getting there)
2    
3     What: modules are portions of code which are loaded seperately to the
4     bot itself, which provided extra services. eg. filesys module
5     provides the entire file system.
6    
7     Why: it allows the core eggdrop, that which is minimally required to be
8     reduced, and allows C coders to add their own ehancements to the
9     bot without recompiling the whole thing.
10    
11     How: run ./configure as normal, then 'make' to make the eggdrop
12     with module support, this will also compile the modules.
13    
14     next do one of two things to load the module:
15     from the partyline (as an owner) type:
16     .loadmodule <module-name>
17     or in a tcl script:
18     loadmodule <module-name>
19    
20     module name is the part BEFORE .so, eg filesys.so module
21     you type '.loadmodule filesys'
22    
23     to see your currently running modules type '.modules'
24    
25     CURRENT MODULES:
26    
27     assoc : assoc support happily load & unload at will.
28     blowfish : use it (or some other encryption module someone might
29     write) FROM THE VERY BEGINNING, the first password you make
30     will be invalid if load this later
31     use 'loadmodule blowfish' in your config file,
32     it's relatively safe to load&unload once your running, but
33     remember, whilst it's unloaded, no-one can login.
34     channels : provides channel related support for the bot, without it, it
35     will just sit on irc, it can respond to msg & ctcp commands,
36     but that's all.
37     console : this module provides storage of console settings when you exit
38     the bot (or .store).
39     ctcp : this provides the normal ctcp replies that you'd expect.
40     filesys : the file system, this is relatively stable and you should be
41     able to load & unload at will, with the following restriction.
42     and users in the file area will currently just hang when you
43     unload the module and resume when it's reloaded, if they EOF
44     before then, and unexplained eof will occur and the bot will
45     clean it up.
46     irc : this module provides ALL NORMAL IRC INTERACTION, if you want
47     the normal join & maintain channels stuff, this is the module.
48     notes : this provides support for storing of notes for users from each
49     other. notes between currently online users is supported in
50     the core, this is only for storing the notes for later
51     retrieval, direct user->user notes are built-in.
52     seen : this module provides seen commands via msg, on channel or via
53     dcc, similar to the various scripts.
54     server : this provides the core server support (removing this is
55     equivalent to the old NO_IRC define).
56     share : userfile sharing.
57     transfer : handles the transfer of files via botnet or dcc, this is
58     REQUIRED for file sharing.
59     wire : an encrypted partyline communication.
60     woobie : just a fun, bizarre test module.
61    
62     This is VERY experimental at this stage, so be wary :)
63    
64     PROGRAMMING THE SUCKERS: (The step by step guide)
65     note: this is for a simple module of 1 source file, if you're doing a multiple
66     source file module, you shouldn't need to read this anyway ;)
67    
68     (a) create a src/mod/module.mod directory in your eggdrop distro
69     (where module is the module name) and cd to it.
70    
71     (b) create a small file called Makefile with the following contents:
72    
73     FILENAME=module
74     include ../Makefile.generic
75    
76     (again with module as the module name), this ensures a make will
77     compile it.
78    
79     (c) next you want to create a file called module.c (again module is the
80     module name), and here's where the work starts :)
81    
82     (1) things you need to include in your source code.
83     (i) #define MODULE_NAME "module-name"
84     You MUST use this, it's required by several short cuts in the
85     code, it's gotta be the name you will be using in .loadmodule
86     (ii) #include "../module.h"
87     this provides all the accessible functions in eggdrop,
88     examine closely src/mod/module.h to find a list of functions
89     available (not, this is still in flux, and you will need to
90     recompile a module when a new version comes out)
91     (iii) and other standard c include files you might need
92     (note stdio.h string.h stdlib.h & sys/types.h are already included)
93     (iv) Function * global;
94     This variable provides access to all the eggdrop functions, without
95     it you can't call any eggdrop functions (heck, the module wont
96     even load)
97     (2) CORE functions every module needs.
98    
99     *SIDENOTE* I suggest in a single source file module you define all
100     functions/variables (except global & module_start) as static, this will
101     drastically reduce the size of modules on decent systems.
102    
103     in each of these cases MODULE = module name
104    
105     (i) char * MODULE_start(Function * func_table)
106     - this module is called when the module is first loaded,
107     you MUST do serveral things in this function
108     (a) global = func_table; (so you can make eggdrop calls)
109     (b) module_register(MODULE_NAME,MODULE_table,major,minor);
110     this records details about the module for other modules
111     & eggdrop itself to access, major is a major version number,
112     minor is a minor version number, MODULE_table is a function
113     table (see below)
114     (c) module_depend(MODULE_NAME,"another-module",major,minor);
115     this lets eggdrop know that your module NEEDS "another-module"
116     of major version 'major' and at least minor version 'minor'
117     to run and hence should try to load it if it's not already here
118     this will return 1 on success, or 0 if it cant be done
119     (at which stage you should return an error)
120     (d) any other initialization stuff you desire, see below for
121     various things you can do.
122     (e) a return value of some sort, returning NULL implies the module
123     loaded successfully, and so the bot can continue.
124     return a non-NULL STRING is an error message, the module
125     (and any other dependant modules) will stop loading
126     and an error will be returned.
127    
128     (ii) static Function * MODULE_table = {
129     MODULE_start,
130     MODULE_close,
131     MODULE_expmem,
132     MODULE_report,
133     any_other_functions,
134     you_want_to_export
135     };
136     ok, it's not a function, it's a list of functions, which any
137     other module can call up, so you can provide services for other
138     modules (eg transfer has raw_dcc_send in it's table to allow
139     the filesys to send files to others)
140     the first 4 functions are FIXED, you MUST have them, they
141     provide important system info.
142    
143     (iii) static char * MODULE_close ()
144     - this is called when the module is unloaded..
145     apart from tidying any relevant data (I suggest you be thorough,
146     we don't want any trailing garbage from modules) you MUST do the
147     following:
148     (a) module_undepend(MODULE_NAME);
149     this lets eggdrop know your module no longer depends on
150     any other modules.
151     (b) return a value, NULL implies success, non-NULL STRING implies
152     the module cannot be unloaded for some reason and hence
153     the bot should leave it in (see blowfish for an example)
154    
155     (iv) static int MODULE_expmem ()
156     this should tally all memory you allocate/deallocate within
157     the module (using modmalloc & modfree), it's used by memory
158     debugging to track memory faults, and by .status to total up
159     memory usage.
160    
161     (v) static void MODULE_report (int idx)
162     this should provide a relatively short report of module status
163     (for .modules/.status)
164    
165     (c) AVALIABLE FUNCTIONS - this is what ppl want no? :)
166     (i) reliable ones, you can RELY on these functions being available,
167     they may move in the tables for the moment (since it's a work
168     in progress) but they will be there...
169     This is just a short list of the ones you need to make
170     a mildly useful module, a goodly portion of the remaining
171     eggdrop functions are avaliable, check src/mod/module.h for
172     info.
173    
174     void * nmalloc (int a); - allocates a bytes
175     void nfree (void * a); - frees a modmalloc'd block
176     context; - actually a #define, records the current
177     - possition in execution, for debugging
178     void dprintf (int idx,char * format, ... ) - just like normal printf,
179     outputs to a dcc/socket/server,
180     idx is a normal dcc idx OR if < 0 is a sock #
181     OR one of: DP_LOG (send to log file)
182     DP_STDOUT (send to stdout)
183     DP_MODE (send via mode queue to sever) *fast*
184     DP_SERVER (send via normal queue to sever) *normal*
185     DP_HELP (send via help queue to sever) - use this
186     for mass outputs to users
187    
188     int module_register ( char * module_name,
189     Function * function_table,
190     int major, int minor )
191     - see above for what/who/why/etc
192     const module_entry * module_find ( char * module_name, int major, int minor);
193     - look for a module, (matching major, >= minor) and return
194     info about it....members of module_entry...
195     char * name; - module name (duh)
196     int major; - real major version
197     int minor; - real minor version
198     Function * funcs; - function table (see above)
199    
200     int module_depend ( char * module_name, char * needed_module,
201     int major, int minor )
202     - marks your module (module_name) as needing needed_module
203     (matching major, >= minor) and tries to load said module
204     if it's not already loaded. returns 1 on success
205     int module_undpend ( char * module_name)
206     - marks your module as no longer needing any of it's
207     dependancies
208     void module_rename (char * old_module_name, char * new_module_name)
209     - renames a module, this works so that for exmaple, you
210     could have efnet.so, undernet.so, ircnet.so & dalnet.so
211     and they called all rename themselves as server.so which
212     is what you really want
213    
214     void add_hook (int hook_num, Function * funcs)
215     void del_hook (int hook_num, Function * funcs)
216    
217     used for adding removing hooks into eggdrop code, on various events, these
218     functions are called, depending on the hook
219    
220     valid hooks:
221    
222     HOOK_SECONDLY - called every second
223     HOOK_MINUTELY - called every minute
224     HOOK_5MINUTELY - called every 5 minutes
225     HOOK_HOURLY - called every hour, (at hourly-updates minutes past)
226     HOOK_DAILY - called every day, when the logfiles are switched
227     HOOK_READ_USERFILE - called when the userfile is read
228     HOOK_USERFILE - called when the userfile is written
229     HOOK_PRE_REHASH - called just *before* rehash
230     HOOK_REHASH - called just after rehash
231     HOOK_IDLE - called whenever the dcc connections have been idle
232     for a whole second
233    
234     char * module_load ( char * module_name ); tries to load the given module,
235     returns 0 on success, or an error msg
236    
237     char * module_unload ( char * module_name ); tries to unload the given module,
238     returns as above.
239    
240     void add_tcl_commands(tcl_cmds * tab);
241     void rem_tcl_commands(tcl_cmds * tab);
242     provides a quick way to load & unload a list of tcl commands, the
243     table is in the form :
244     { char * func_name, Function * function_to_call }
245     these are normal tcl commands (as done in tcl*.c)
246     use { 0, 0 } to indicate the end of the list
247    
248     void add_tcl_ints(tcl_ints *);
249     void rem_tcl_ints(tcl_ints *);
250     provides a way to add/remove links from c variables to tcl variables
251     (add checks to see if the tcl already exists and copies it over the C one)
252     format of table is :
253     { char * variable_name, int * variable }
254     terminate with {0,0};
255    
256     void add_tcl_strings(tcl_strings *);
257     void rem_tcl_strings(tcl_strings *);
258     provides a way to add/remove links from c strings to tcl strings
259     (also copies exists tcl values)
260     format:
261     { char * variable_name, char * string, int length, int flags }
262     terminate with { 0, 0, 0, 0 }
263     length: set to 0 if you want a const string.
264     flags: use STR_DIR if you want a / constantly appended,
265     use STR_PROTECT if you want the variable on set in the configfile,
266     not during normal usage.
267    
268     void putlog (int logmode, char * channel, char * format, ... )
269     logs a comment, see src/eggdrop.h for logmodes, channel makes
270     a channel or "*" for all.
271    
272     void add_builtins (p_tcl_hash_list table, cmd_t * cc);
273     void rem_builtins (p_tcl_hash_list table, cmd_t * cc);
274     the method of adding/remove bindings for tcl hash tables.
275 fabian 1.2 table is a hash table you find with find_hash_table,
276     cc format:
277 segfault 1.1 { char * command, char * flags, Function * function }
278 fabian 1.2 terminate with { 0, 0, 0, 0 }
279 segfault 1.1 this is EXACTLY like a bind command in tcl, (heck, tcl_bind calls
280     the same function this does),
281     function is called with exactly the same args as a tcl binding is
282     (except for dcc which does include the handle in C) with type conversion
283     taken into account (e.g. idx's are ints)
284     return much the same as tcl bindings, use int 0/1 for those
285     which require 0/1 or char * for those which require a string (eg filt)
286     or nothing if no return is required.
287     return is also in src/tclhash.c

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