mirror of
https://github.com/matrix-construct/construct
synced 2024-10-30 02:18:58 +01:00
e8355cb7be
This version leverages a flexible, cleaner key-value strategy reducing the need to design entire new headers for every feature addition, change, etc. * A friendly declaration for the module authors, with minimal requirements to fill in, and explicit labels of what the fields are. * Repetition of keys, removing references to (and the requirement to build) a clist, hlist and hfnlist and caplist and whatever the future holds. * Safe deterministic loading and unloading. Keys are evaluated in order, errors can be recognized, and unloading occurs in reverse order. ircd: Refactor internal half of modules.c, with some V3 additions. Provides better delegation for versions, a cleaner stack with better error handling, and some functionality deduping. V1 and V2 handlers are still somewhat unaltered, just factored in.
201 lines
6.4 KiB
C
201 lines
6.4 KiB
C
/*
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* ircd-ratbox: A slightly useful ircd.
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* modules.h: A header for the modules functions.
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*
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* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
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* Copyright (C) 1996-2002 Hybrid Development Team
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* Copyright (C) 2002-2004 ircd-ratbox development team
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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* USA
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*/
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#ifndef INCLUDED_modules_h
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#define INCLUDED_modules_h
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#include "serno.h"
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#include "defaults.h"
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#include "setup.h"
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#include "parse.h"
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#define MAPI_CHARYBDIS 2
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#include <ltdl.h>
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#include "msg.h"
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#include "hook.h"
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struct module
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{
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const char *name;
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const char *path;
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const char *version;
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const char *description;
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lt_dlhandle address;
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int core; /* This is int for backwards compat reasons */
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int origin; /* Ditto */
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int mapi_version;
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void *mapi_header; /* actually struct mapi_mheader_av<mapi_version> */
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rb_dlink_node node;
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};
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#define MAPI_MAGIC_HDR 0x4D410000
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#define MAPI_V1 (MAPI_MAGIC_HDR | 0x1)
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#define MAPI_V2 (MAPI_MAGIC_HDR | 0x2)
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#define MAPI_V3 (MAPI_MAGIC_HDR | 0x3)
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#define MAPI_MAGIC(x) ((x) & 0xffff0000)
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#define MAPI_VERSION(x) ((x) & 0x0000ffff)
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typedef struct Message* mapi_clist_av1;
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typedef struct
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{
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const char *hapi_name;
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int *hapi_id;
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} mapi_hlist_av1;
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typedef struct
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{
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const char *hapi_name;
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hookfn fn;
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} mapi_hfn_list_av1;
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#define MAPI_CAP_CLIENT 1
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#define MAPI_CAP_SERVER 2
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typedef struct
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{
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int cap_index; /* Which cap index does this belong to? */
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const char *cap_name; /* Capability name */
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void *cap_ownerdata; /* Not used much but why not... */
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unsigned int *cap_id; /* May be set to non-NULL to store cap id */
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} mapi_cap_list_av2;
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struct mapi_mheader_av1
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{
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int mapi_version; /* Module API version */
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int (*mapi_register)(void); /* Register function; ret -1 = failure (unload) */
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void (*mapi_unregister)(void); /* Unregister function. */
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mapi_clist_av1 *mapi_command_list; /* List of commands to add. */
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mapi_hlist_av1 *mapi_hook_list; /* List of hooks to add. */
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mapi_hfn_list_av1 *mapi_hfn_list; /* List of hook_add_hook's to do */
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const char *mapi_module_version; /* Module's version (freeform) */
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};
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#define MAPI_ORIGIN_UNKNOWN 0 /* Unknown provenance (AV1 etc.) */
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#define MAPI_ORIGIN_EXTENSION 1 /* Charybdis extension */
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#define MAPI_ORIGIN_CORE 2 /* Charybdis core module */
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struct mapi_mheader_av2
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{
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int mapi_version; /* Module API version */
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int (*mapi_register)(void); /* Register function; ret -1 = failure (unload) */
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void (*mapi_unregister)(void); /* Unregister function. */
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mapi_clist_av1 *mapi_command_list; /* List of commands to add. */
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mapi_hlist_av1 *mapi_hook_list; /* List of hooks to add. */
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mapi_hfn_list_av1 *mapi_hfn_list; /* List of hook_add_hook's to do */
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mapi_cap_list_av2 *mapi_cap_list; /* List of CAPs to add */
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const char *mapi_module_version; /* Module's version (freeform), replaced with ircd version if NULL */
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const char *mapi_module_description; /* Module's description (freeform) */
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time_t mapi_datecode; /* Unix timestamp of module's build */
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};
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#define DECLARE_MODULE_AV1(name, reg, unreg, cl, hl, hfnlist, v) \
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struct mapi_mheader_av1 _mheader = { MAPI_V1, reg, unreg, cl, hl, hfnlist, v}
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#define DECLARE_MODULE_AV2(name, reg, unreg, cl, hl, hfnlist, caplist, v, desc) \
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struct mapi_mheader_av2 _mheader = { MAPI_V2, reg, unreg, cl, hl, hfnlist, caplist, v, desc, DATECODE}
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/***
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Version 3 modules utilize a flexible key/value vector.
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Example:
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DECLARE_MODULE_AV3
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(
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MOD_ATTR { "name", "mymodule" },
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MOD_ATTR { "mtab", &message_foo },
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MOD_ATTR { "mtab", &message_unfoo },
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MOD_ATTR { "init", modinitfunc },
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MOD_ATTR { "hook", MOD_HOOK { "myhook", &id } },
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MOD_ATTR { "hookfn", MOD_HOOKFN { "myhook", hookfun } },
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)
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Notes:
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- Multiple keys with the same name will have different behavior depending on the logic for that key.
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- On load, the order in which keys are specified is the order they will be evaluated (top to bottom).
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- On unload, the evaluation is the REVERSE order (bottom to top).
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- If an init function returns false, or other error occurs, no further keys are evaluated and the
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unload rolls back from that point.
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***/
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struct mapi_av3_attr
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{
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#define MAPI_V3_KEY_MAXLEN 16 /* Maximum length for a key string */
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const char *key;
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union { const void *cvalue; void *value; int (*init)(void); void (*fini)(void); };
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};
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struct mapi_mheader_av3
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{
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int mapi_version; // Module API version
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struct mapi_av3_attr **attrs; // A vector of attributes, NULL terminated
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};
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#define MOD_ATTR &(struct mapi_av3_attr)
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#define MOD_HOOK &(mapi_hlist_av1)
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#define MOD_HOOKFN &(mapi_hfn_list_av1)
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#define DECLARE_MODULE_AV3(...) \
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struct mapi_mheader_av3 _mheader = \
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{ \
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MAPI_V3, (struct mapi_av3_attr *[]) \
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{ \
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MOD_ATTR { "time", DATECODE }, \
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__VA_ARGS__, \
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NULL \
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} \
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};
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// Prefixes your slog() message with module info
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void module_log(struct module *mod, const char *fmt, ...) AFP(2, 3);
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/* add a path */
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void mod_add_path(const char *path);
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void mod_clear_paths(void);
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/* load a module */
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extern void load_module(char *path);
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/* load all modules */
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extern void load_all_modules(bool warn);
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/* load core modules */
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extern void load_core_modules(bool);
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extern bool unload_one_module(const char *, bool);
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extern bool load_one_module(const char *, int, bool);
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extern bool load_a_module(const char *, bool, int, bool);
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extern struct module *findmodule_byname(const char *);
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extern void init_modules(void);
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extern rb_dlink_list module_list;
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extern rb_dlink_list mod_paths;
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#endif /* INCLUDED_modules_h */
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