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angiosperm/ircd/modules.c

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/*
* ircd-ratbox: A slightly useful ircd.
* modules.c: A module loader.
*
* Copyright (C) 1990 Jarkko Oikarinen and University of Oulu, Co Center
* Copyright (C) 1996-2002 Hybrid Development Team
* Copyright (C) 2002-2005 ircd-ratbox development team
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
* USA
*/
#include "stdinc.h"
#include "modules.h"
#include "logger.h"
#include "ircd.h"
#include "client.h"
#include "send.h"
#include "s_conf.h"
#include "s_newconf.h"
#include "numeric.h"
#include "parse.h"
#include "ircd_defs.h"
#include "match.h"
#include "s_serv.h"
#include "capability.h"
#include "hash.h"
#include <ltdl.h>
#ifndef LT_MODULE_EXT
# error "Solanum requires loadable module support."
#endif
rb_dlink_list module_list;
rb_dlink_list mod_paths;
static const char *core_module_table[] = {
"m_ban",
"m_die",
"m_error",
"m_identified",
"m_join",
"m_kick",
"m_kill",
"m_message",
"m_mode",
"m_modules",
"m_nick",
"m_part",
"m_quit",
"m_server",
"m_squit",
NULL
};
#define MOD_WARN_DELTA (90 * 86400) /* time in seconds, 86400 seconds in a day */
void
init_modules(void)
{
if(lt_dlinit())
{
ilog(L_MAIN, "lt_dlinit failed");
exit(EXIT_FAILURE);
}
/* Add the default paths we look in to the module system --nenolod */
mod_add_path(ircd_paths[IRCD_PATH_MODULES]);
mod_add_path(ircd_paths[IRCD_PATH_AUTOLOAD_MODULES]);
}
static unsigned int prev_caps;
void
mod_remember_clicaps(void)
{
prev_caps = capability_index_mask(cli_capindex);
}
void
mod_notify_clicaps(void)
{
unsigned int cur_caps = capability_index_mask(cli_capindex);
unsigned int del = prev_caps & ~cur_caps;
unsigned int new = cur_caps & ~prev_caps;
if (del)
sendto_local_clients_with_capability(CLICAP_CAP_NOTIFY, ":%s CAP * DEL :%s",
me.name, capability_index_list(cli_capindex, del));
if (new)
sendto_local_clients_with_capability(CLICAP_CAP_NOTIFY, ":%s CAP * NEW :%s",
me.name, capability_index_list(cli_capindex, new));
}
/* mod_find_path()
*
* input - path
* output - none
* side effects - returns a module path from path
*/
static char *
mod_find_path(const char *path)
{
rb_dlink_node *ptr;
char *mpath;
RB_DLINK_FOREACH(ptr, mod_paths.head)
{
mpath = ptr->data;
if(!strcmp(path, mpath))
return mpath;
}
return NULL;
}
/* mod_add_path
*
* input - path
* ouput -
* side effects - adds path to list
*/
void
mod_add_path(const char *path)
{
char *pathst;
if(mod_find_path(path))
return;
pathst = rb_strdup(path);
rb_dlinkAddAlloc(pathst, &mod_paths);
}
/* mod_clear_paths()
*
* input -
* output -
* side effects - clear the lists of paths
*/
void
mod_clear_paths(void)
{
rb_dlink_node *ptr, *next_ptr;
RB_DLINK_FOREACH_SAFE(ptr, next_ptr, mod_paths.head)
{
rb_free(ptr->data);
rb_free_rb_dlink_node(ptr);
}
mod_paths.head = mod_paths.tail = NULL;
mod_paths.length = 0;
}
/* findmodule_byname
*
* input - module to load
* output - index of module on success, -1 on failure
* side effects - none
*/
struct module *
findmodule_byname(const char *name)
{
rb_dlink_node *ptr;
char name_ext[PATH_MAX + 1];
rb_strlcpy(name_ext, name, sizeof name_ext);
rb_strlcat(name_ext, LT_MODULE_EXT, sizeof name_ext);
RB_DLINK_FOREACH(ptr, module_list.head)
{
struct module *mod = ptr->data;
if(!irccmp(mod->name, name))
return mod;
if(!irccmp(mod->name, name_ext))
return mod;
}
return NULL;
}
/* load_all_modules()
*
* input -
* output -
* side effects -
*/
void
load_all_modules(bool warn)
{
DIR *system_module_dir = NULL;
struct dirent *ldirent = NULL;
char module_fq_name[PATH_MAX + 1];
size_t module_ext_len = strlen(LT_MODULE_EXT);
system_module_dir = opendir(ircd_paths[IRCD_PATH_AUTOLOAD_MODULES]);
if(system_module_dir == NULL)
{
ilog(L_MAIN, "Could not load modules from %s: %s", ircd_paths[IRCD_PATH_AUTOLOAD_MODULES], strerror(errno));
return;
}
while ((ldirent = readdir(system_module_dir)) != NULL)
{
size_t len = strlen(ldirent->d_name);
if(len > module_ext_len &&
rb_strncasecmp(ldirent->d_name + (len - module_ext_len), LT_MODULE_EXT, module_ext_len) == 0)
{
(void) snprintf(module_fq_name, sizeof(module_fq_name), "%s/%s",
ircd_paths[IRCD_PATH_AUTOLOAD_MODULES], ldirent->d_name);
(void) load_a_module(module_fq_name, warn, MAPI_ORIGIN_CORE, false);
}
}
(void) closedir(system_module_dir);
}
/* load_core_modules()
*
* input -
* output -
* side effects - core modules are loaded, if any fail, kill ircd
*/
void
load_core_modules(bool warn)
{
char module_name[PATH_MAX];
int i;
for (i = 0; core_module_table[i]; i++)
{
snprintf(module_name, sizeof(module_name), "%s/%s", ircd_paths[IRCD_PATH_MODULES], core_module_table[i]);
if(load_a_module(module_name, warn, MAPI_ORIGIN_CORE, true) == false)
{
ilog(L_MAIN,
"Error loading core module %s: terminating ircd",
core_module_table[i]);
exit(EXIT_FAILURE);
}
}
}
/* load_one_module()
*
* input -
* output -
* side effects -
*/
bool
load_one_module(const char *path, int origin, bool coremodule)
{
char modpath[PATH_MAX];
rb_dlink_node *pathst;
if (server_state_foreground)
inotice("loading module %s ...", path);
if(coremodule)
origin = MAPI_ORIGIN_CORE;
RB_DLINK_FOREACH(pathst, mod_paths.head)
{
struct stat statbuf;
const char *mpath = pathst->data;
snprintf(modpath, sizeof(modpath), "%s/%s%s", mpath, path, LT_MODULE_EXT);
if((strstr(modpath, "../") == NULL) && (strstr(modpath, "/..") == NULL))
{
if(stat(modpath, &statbuf) == 0 && S_ISREG(statbuf.st_mode))
{
/* Regular files only please */
return load_a_module(modpath, true, origin, coremodule);
}
}
}
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "Cannot locate module %s", path);
if (server_state_foreground)
ierror("cannot locate module %s", path);
return false;
}
static char unknown_ver[] = "<unknown>";
static char unknown_description[] = "<none>";
/* unload_one_module()
*
* inputs - name of module to unload
* - true to say modules unloaded, false to not
* output - true if successful, false if error
* side effects - module is unloaded
*/
bool
unload_one_module(const char *name, bool warn)
{
struct module *mod;
if((mod = findmodule_byname(name)) == NULL)
return false;
/*
** XXX - The type system in C does not allow direct conversion between
** data and function pointers, but as it happens, most C compilers will
** safely do this, however it is a theoretical overlow to cast as we
** must do here. I have library functions to take care of this, but
** despite being more "correct" for the C language, this is more
** practical. Removing the abuse of the ability to cast ANY pointer
** to and from an integer value here will break some compilers.
** -jmallett
*/
/* Left the comment in but the code isn't here any more -larne */
switch (mod->mapi_version)
{
case 1:
{
struct mapi_mheader_av1 *mheader = mod->mapi_header;
if(mheader->mapi_command_list)
{
struct Message **m;
for (m = mheader->mapi_command_list; *m; ++m)
mod_del_cmd(*m);
}
/* hook events are never removed, we simply lose the
* ability to call them --fl
*/
if(mheader->mapi_hfn_list)
{
mapi_hfn_list_av1 *m;
for (m = mheader->mapi_hfn_list; m->hapi_name; ++m)
remove_hook(m->hapi_name, m->fn);
}
if(mheader->mapi_unregister)
mheader->mapi_unregister();
break;
}
case 2:
{
struct mapi_mheader_av2 *mheader = mod->mapi_header;
/* XXX duplicate code :( */
if(mheader->mapi_command_list)
{
struct Message **m;
for (m = mheader->mapi_command_list; *m; ++m)
mod_del_cmd(*m);
}
/* hook events are never removed, we simply lose the
* ability to call them --fl
*/
if(mheader->mapi_hfn_list)
{
mapi_hfn_list_av1 *m;
for (m = mheader->mapi_hfn_list; m->hapi_name; ++m)
remove_hook(m->hapi_name, m->fn);
}
if(mheader->mapi_unregister)
mheader->mapi_unregister();
if(mheader->mapi_cap_list)
{
mapi_cap_list_av2 *m;
for (m = mheader->mapi_cap_list; m->cap_name; ++m)
{
struct CapabilityIndex *idx;
switch (m->cap_index)
{
case MAPI_CAP_CLIENT:
idx = cli_capindex;
break;
case MAPI_CAP_SERVER:
idx = serv_capindex;
break;
default:
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Unknown/unsupported CAP index found of type %d on capability %s when unloading %s",
m->cap_index, m->cap_name, mod->name);
ilog(L_MAIN,
"Unknown/unsupported CAP index found of type %d on capability %s when unloading %s",
m->cap_index, m->cap_name, mod->name);
continue;
}
capability_orphan(idx, m->cap_name);
}
}
break;
}
default:
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Unknown/unsupported MAPI version %d when unloading %s!",
mod->mapi_version, mod->name);
ilog(L_MAIN, "Unknown/unsupported MAPI version %d when unloading %s!",
mod->mapi_version, mod->name);
break;
}
lt_dlclose(mod->address);
rb_dlinkDelete(&mod->node, &module_list);
rb_free(mod->name);
rb_free(mod->path);
rb_free(mod);
if(warn)
{
ilog(L_MAIN, "Module %s unloaded", name);
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE, "Module %s unloaded", name);
}
return true;
}
/*
* load_a_module()
*
* inputs - path name of module, bool to notice, int of origin, bool if core
* output - false if error true if success
* side effects - loads a module if successful
*/
bool
load_a_module(const char *path, bool warn, int origin, bool core)
{
struct module *mod;
lt_dlhandle tmpptr;
char *mod_displayname, *c;
const char *ver, *description = NULL;
int *mapi_version;
mod_displayname = rb_basename(path);
/* Trim off the ending for the display name if we have to */
if((c = rb_strcasestr(mod_displayname, LT_MODULE_EXT)) != NULL)
*c = '\0';
tmpptr = lt_dlopenext(path);
if(tmpptr == NULL)
{
const char *err = lt_dlerror();
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Error loading module %s: %s", mod_displayname, err);
ilog(L_MAIN, "Error loading module %s: %s", mod_displayname, err);
rb_free(mod_displayname);
return false;
}
/*
* _mheader is actually a struct mapi_mheader_*, but mapi_version
* is always the first member of this structure, so we treate it
* as a single int in order to determine the API version.
* -larne.
*/
mapi_version = (int *) (uintptr_t) lt_dlsym(tmpptr, "_mheader");
if((mapi_version == NULL
&& (mapi_version = (int *) (uintptr_t) lt_dlsym(tmpptr, "__mheader")) == NULL)
|| MAPI_MAGIC(*mapi_version) != MAPI_MAGIC_HDR)
{
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Data format error: module %s has no MAPI header.",
mod_displayname);
ilog(L_MAIN, "Data format error: module %s has no MAPI header.", mod_displayname);
(void) lt_dlclose(tmpptr);
rb_free(mod_displayname);
return false;
}
switch (MAPI_VERSION(*mapi_version))
{
case 1:
{
struct mapi_mheader_av1 *mheader = (struct mapi_mheader_av1 *)(void *)mapi_version; /* see above */
if(mheader->mapi_register && (mheader->mapi_register() == -1))
{
ilog(L_MAIN, "Module %s indicated failure during load.",
mod_displayname);
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Module %s indicated failure during load.",
mod_displayname);
lt_dlclose(tmpptr);
rb_free(mod_displayname);
return false;
}
if(mheader->mapi_command_list)
{
struct Message **m;
for (m = mheader->mapi_command_list; *m; ++m)
mod_add_cmd(*m);
}
if(mheader->mapi_hook_list)
{
mapi_hlist_av1 *m;
for (m = mheader->mapi_hook_list; m->hapi_name; ++m)
*m->hapi_id = register_hook(m->hapi_name);
}
if(mheader->mapi_hfn_list)
{
mapi_hfn_list_av1 *m;
for (m = mheader->mapi_hfn_list; m->hapi_name; ++m)
add_hook(m->hapi_name, m->fn);
}
ver = mheader->mapi_module_version;
break;
}
case 2:
{
struct mapi_mheader_av2 *mheader = (struct mapi_mheader_av2 *)(void *)mapi_version; /* see above */
if(mheader->mapi_cap_list)
{
mapi_cap_list_av2 *m;
for (m = mheader->mapi_cap_list; m->cap_name; ++m)
{
struct CapabilityIndex *idx;
int result;
switch (m->cap_index)
{
case MAPI_CAP_CLIENT:
idx = cli_capindex;
break;
case MAPI_CAP_SERVER:
idx = serv_capindex;
break;
default:
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Unknown/unsupported CAP index found of type %d on capability %s when loading %s",
m->cap_index, m->cap_name, mod_displayname);
ilog(L_MAIN,
"Unknown/unsupported CAP index found of type %d on capability %s when loading %s",
m->cap_index, m->cap_name, mod_displayname);
continue;
}
result = capability_put(idx, m->cap_name, m->cap_ownerdata);
if (m->cap_id != NULL)
*(m->cap_id) = result;
}
}
/* XXX duplicated code :( */
if(mheader->mapi_register && (mheader->mapi_register() == -1))
{
ilog(L_MAIN, "Module %s indicated failure during load.",
mod_displayname);
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Module %s indicated failure during load.",
mod_displayname);
if(mheader->mapi_cap_list)
{
mapi_cap_list_av2 *m;
for (m = mheader->mapi_cap_list; m->cap_name; ++m)
{
struct CapabilityIndex *idx;
switch (m->cap_index)
{
case MAPI_CAP_CLIENT:
idx = cli_capindex;
break;
case MAPI_CAP_SERVER:
idx = serv_capindex;
break;
default:
continue;
}
capability_orphan(idx, m->cap_name);
}
}
lt_dlclose(tmpptr);
rb_free(mod_displayname);
return false;
}
/* Basic date code checks
*
* Don't make them fatal, but do complain about differences within a certain time frame.
* Later on if there are major API changes we can add fatal checks.
* -- Elizafox
*/
if(mheader->mapi_datecode != datecode && mheader->mapi_datecode > 0)
{
long int delta = datecode - mheader->mapi_datecode;
if (delta > MOD_WARN_DELTA)
{
delta /= 86400;
iwarn("Module %s build date is out of sync with ircd build date by %ld days, expect problems",
mod_displayname, delta);
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Module %s build date is out of sync with ircd build date by %ld days, expect problems",
mod_displayname, delta);
}
}
if(mheader->mapi_command_list)
{
struct Message **m;
for (m = mheader->mapi_command_list; *m; ++m)
mod_add_cmd(*m);
}
if(mheader->mapi_hook_list)
{
mapi_hlist_av1 *m;
for (m = mheader->mapi_hook_list; m->hapi_name; ++m)
*m->hapi_id = register_hook(m->hapi_name);
}
if(mheader->mapi_hfn_list)
{
mapi_hfn_list_av1 *m;
for (m = mheader->mapi_hfn_list; m->hapi_name; ++m)
{
int priority = m->priority;
if (priority == 0)
priority = HOOK_NORMAL;
add_hook_prio(m->hapi_name, m->fn, priority);
}
}
/* New in MAPI v2 - version replacement */
ver = mheader->mapi_module_version ? mheader->mapi_module_version : ircd_version;
description = mheader->mapi_module_description;
}
break;
default:
ilog(L_MAIN, "Module %s has unknown/unsupported MAPI version %d.",
mod_displayname, MAPI_VERSION(*mapi_version));
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Module %s has unknown/unsupported MAPI version %d.",
mod_displayname, *mapi_version);
lt_dlclose(tmpptr);
rb_free(mod_displayname);
return false;
}
if(ver == NULL)
ver = unknown_ver;
if(description == NULL)
description = unknown_description;
mod = rb_malloc(sizeof(struct module));
mod->address = tmpptr;
mod->version = ver;
mod->description = description;
mod->core = core;
mod->name = rb_strdup(mod_displayname);
mod->mapi_header = mapi_version;
mod->mapi_version = MAPI_VERSION(*mapi_version);
mod->origin = origin;
mod->path = rb_strdup(path);
rb_dlinkAdd(mod, &mod->node, &module_list);
if(warn)
{
const char *o;
switch (origin)
{
case MAPI_ORIGIN_EXTENSION:
o = "extension";
break;
case MAPI_ORIGIN_CORE:
o = "core";
break;
default:
o = "unknown";
break;
}
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Module %s [version: %s; MAPI version: %d; origin: %s; description: \"%s\"] loaded at %p",
mod_displayname, ver, MAPI_VERSION(*mapi_version), o, description,
(void *) tmpptr);
ilog(L_MAIN, "Module %s [version: %s; MAPI version: %d; origin: %s; description: \"%s\"] loaded at %p",
mod_displayname, ver, MAPI_VERSION(*mapi_version), o, description, (void *) tmpptr);
}
rb_free(mod_displayname);
return true;
}
void
modules_do_reload(void *info_)
{
struct modreload *info = info_;
struct module *mod;
int check_core;
int origin;
char *m_bn = rb_basename(info->module);
char *path;
struct Client *source_p = find_id(info->id);
if((mod = findmodule_byname(m_bn)) == NULL)
{
if (source_p) sendto_one_notice(source_p, ":Module %s is not loaded", m_bn);
rb_free(info);
rb_free(m_bn);
return;
}
origin = mod->origin;
check_core = mod->core;
path = rb_strdup(mod->path);
mod_remember_clicaps();
if(unload_one_module(m_bn, true) == false)
{
if (source_p) sendto_one_notice(source_p, ":Module %s is not loaded", m_bn);
rb_free(info);
rb_free(m_bn);
rb_free(path);
return;
}
if((load_a_module(path, true, origin, check_core) == false) && check_core)
{
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Error reloading core module: %s: terminating ircd", m_bn);
ilog(L_MAIN, "Error loading core module %s: terminating ircd", m_bn);
exit(0);
}
mod_notify_clicaps();
rb_free(info);
rb_free(m_bn);
rb_free(path);
}
void
modules_do_restart(void *unused)
{
unsigned int modnum = 0;
rb_dlink_node *ptr, *nptr;
mod_remember_clicaps();
RB_DLINK_FOREACH_SAFE(ptr, nptr, module_list.head)
{
struct module *mod = ptr->data;
if(!unload_one_module(mod->name, false))
{
ilog(L_MAIN, "Module Restart: %s was not unloaded %s",
mod->name,
mod->core? "(core module)" : "");
if(!mod->core)
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Module Restart: %s failed to unload",
mod->name);
continue;
}
modnum++;
}
load_all_modules(false);
load_core_modules(false);
rehash(false);
mod_notify_clicaps();
sendto_realops_snomask(SNO_GENERAL, L_NETWIDE,
"Module Restart: %u modules unloaded, %lu modules loaded",
modnum, rb_dlink_list_length(&module_list));
ilog(L_MAIN, "Module Restart: %u modules unloaded, %lu modules loaded", modnum, rb_dlink_list_length(&module_list));
}
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