41390bfe5f
ENCAP module. The ms_encap function is responsible for dispatching the command handler and then the modules will eventually be reloaded. However, if the ENCAP module is reloaded to a different address, the stack now contains the address of a function that no longer exists. Also, in this version of the IRCd, the module restarting functionality was located in a function that is itself located in a module, so things will also go badly if that module is reloaded to a different address, too. Return immediately from the command handler and have the event loop call the function responsible for reloading the modules instead. c.f. release/3.5 commit db05a3621058 Reported-by: mniip (Freenode)
705 lines
17 KiB
C
705 lines
17 KiB
C
/*
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* ircd-ratbox: A slightly useful ircd.
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* modules.c: A module loader.
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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) 2002-2005 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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#include "stdinc.h"
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#include "modules.h"
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#include "logger.h"
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#include "ircd.h"
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#include "client.h"
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#include "send.h"
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#include "s_conf.h"
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#include "s_newconf.h"
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#include "numeric.h"
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#include "parse.h"
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#include "ircd_defs.h"
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#include "match.h"
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#include "s_serv.h"
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#include "capability.h"
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#include <ltdl.h>
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#ifndef LT_MODULE_EXT
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# error "Charybdis requires loadable module support."
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#endif
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rb_dlink_list module_list;
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rb_dlink_list mod_paths;
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static const char *core_module_table[] = {
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"m_ban",
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"m_die",
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"m_error",
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"m_join",
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"m_kick",
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"m_kill",
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"m_message",
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"m_mode",
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"m_modules",
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"m_nick",
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"m_part",
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"m_quit",
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"m_server",
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"m_squit",
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NULL
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};
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#define MOD_WARN_DELTA (90 * 86400) /* time in seconds, 86400 seconds in a day */
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void
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init_modules(void)
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{
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if(lt_dlinit())
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{
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ilog(L_MAIN, "lt_dlinit failed");
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exit(EXIT_FAILURE);
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}
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/* Add the default paths we look in to the module system --nenolod */
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mod_add_path(ircd_paths[IRCD_PATH_MODULES]);
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mod_add_path(ircd_paths[IRCD_PATH_AUTOLOAD_MODULES]);
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}
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/* mod_find_path()
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*
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* input - path
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* output - none
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* side effects - returns a module path from path
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*/
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static char *
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mod_find_path(const char *path)
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{
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rb_dlink_node *ptr;
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char *mpath;
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RB_DLINK_FOREACH(ptr, mod_paths.head)
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{
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mpath = ptr->data;
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if(!strcmp(path, mpath))
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return mpath;
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}
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return NULL;
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}
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/* mod_add_path
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*
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* input - path
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* ouput -
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* side effects - adds path to list
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*/
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void
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mod_add_path(const char *path)
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{
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char *pathst;
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if(mod_find_path(path))
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return;
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pathst = rb_strdup(path);
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rb_dlinkAddAlloc(pathst, &mod_paths);
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}
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/* mod_clear_paths()
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*
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* input -
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* output -
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* side effects - clear the lists of paths
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*/
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void
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mod_clear_paths(void)
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{
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rb_dlink_node *ptr, *next_ptr;
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RB_DLINK_FOREACH_SAFE(ptr, next_ptr, mod_paths.head)
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{
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rb_free(ptr->data);
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rb_free_rb_dlink_node(ptr);
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}
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mod_paths.head = mod_paths.tail = NULL;
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mod_paths.length = 0;
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}
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/* findmodule_byname
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*
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* input - module to load
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* output - index of module on success, -1 on failure
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* side effects - none
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*/
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struct module *
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findmodule_byname(const char *name)
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{
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rb_dlink_node *ptr;
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char name_ext[PATH_MAX + 1];
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rb_strlcpy(name_ext, name, sizeof name_ext);
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rb_strlcat(name_ext, LT_MODULE_EXT, sizeof name_ext);
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RB_DLINK_FOREACH(ptr, module_list.head)
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{
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struct module *mod = ptr->data;
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if(!irccmp(mod->name, name))
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return mod;
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if(!irccmp(mod->name, name_ext))
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return mod;
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}
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return NULL;
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}
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/* load_all_modules()
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*
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* input -
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* output -
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* side effects -
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*/
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void
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load_all_modules(bool warn)
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{
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DIR *system_module_dir = NULL;
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struct dirent *ldirent = NULL;
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char module_fq_name[PATH_MAX + 1];
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size_t module_ext_len = strlen(LT_MODULE_EXT);
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system_module_dir = opendir(ircd_paths[IRCD_PATH_AUTOLOAD_MODULES]);
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if(system_module_dir == NULL)
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{
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ilog(L_MAIN, "Could not load modules from %s: %s", ircd_paths[IRCD_PATH_AUTOLOAD_MODULES], strerror(errno));
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return;
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}
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while ((ldirent = readdir(system_module_dir)) != NULL)
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{
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size_t len = strlen(ldirent->d_name);
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if(len > module_ext_len &&
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rb_strncasecmp(ldirent->d_name + (len - module_ext_len), LT_MODULE_EXT, module_ext_len) == 0)
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{
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(void) snprintf(module_fq_name, sizeof(module_fq_name), "%s%c%s",
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ircd_paths[IRCD_PATH_AUTOLOAD_MODULES], RB_PATH_SEPARATOR, ldirent->d_name);
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(void) load_a_module(module_fq_name, warn, MAPI_ORIGIN_CORE, false);
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}
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}
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(void) closedir(system_module_dir);
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}
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/* load_core_modules()
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*
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* input -
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* output -
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* side effects - core modules are loaded, if any fail, kill ircd
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*/
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void
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load_core_modules(bool warn)
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{
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char module_name[PATH_MAX];
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int i;
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for (i = 0; core_module_table[i]; i++)
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{
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snprintf(module_name, sizeof(module_name), "%s%c%s", ircd_paths[IRCD_PATH_MODULES], RB_PATH_SEPARATOR,
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core_module_table[i]);
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if(load_a_module(module_name, warn, MAPI_ORIGIN_CORE, true) == false)
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{
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ilog(L_MAIN,
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"Error loading core module %s: terminating ircd",
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core_module_table[i]);
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exit(EXIT_FAILURE);
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}
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}
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}
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/* load_one_module()
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*
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* input -
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* output -
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* side effects -
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*/
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bool
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load_one_module(const char *path, int origin, bool coremodule)
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{
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char modpath[PATH_MAX];
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rb_dlink_node *pathst;
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if (server_state_foreground)
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inotice("loading module %s ...", path);
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if(coremodule)
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origin = MAPI_ORIGIN_CORE;
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RB_DLINK_FOREACH(pathst, mod_paths.head)
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{
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struct stat statbuf;
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const char *mpath = pathst->data;
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snprintf(modpath, sizeof(modpath), "%s%c%s%s", mpath, RB_PATH_SEPARATOR, path, LT_MODULE_EXT);
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if((strstr(modpath, "../") == NULL) && (strstr(modpath, "/..") == NULL))
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{
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if(stat(modpath, &statbuf) == 0 && S_ISREG(statbuf.st_mode))
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{
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/* Regular files only please */
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return load_a_module(modpath, true, origin, coremodule);
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}
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}
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}
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sendto_realops_snomask(SNO_GENERAL, L_ALL, "Cannot locate module %s", path);
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return false;
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}
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static char unknown_ver[] = "<unknown>";
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static char unknown_description[] = "<none>";
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/* unload_one_module()
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*
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* inputs - name of module to unload
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* - true to say modules unloaded, false to not
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* output - true if successful, false if error
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* side effects - module is unloaded
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*/
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bool
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unload_one_module(const char *name, bool warn)
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{
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struct module *mod;
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if((mod = findmodule_byname(name)) == NULL)
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return false;
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if(mod->core)
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return false;
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/*
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** XXX - The type system in C does not allow direct conversion between
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** data and function pointers, but as it happens, most C compilers will
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** safely do this, however it is a theoretical overlow to cast as we
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** must do here. I have library functions to take care of this, but
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** despite being more "correct" for the C language, this is more
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** practical. Removing the abuse of the ability to cast ANY pointer
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** to and from an integer value here will break some compilers.
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** -jmallett
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*/
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/* Left the comment in but the code isn't here any more -larne */
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switch (mod->mapi_version)
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{
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case 1:
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{
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struct mapi_mheader_av1 *mheader = mod->mapi_header;
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if(mheader->mapi_command_list)
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{
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struct Message **m;
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for (m = mheader->mapi_command_list; *m; ++m)
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mod_del_cmd(*m);
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}
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/* hook events are never removed, we simply lose the
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* ability to call them --fl
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*/
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if(mheader->mapi_hfn_list)
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{
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mapi_hfn_list_av1 *m;
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for (m = mheader->mapi_hfn_list; m->hapi_name; ++m)
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remove_hook(m->hapi_name, m->fn);
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}
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if(mheader->mapi_unregister)
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mheader->mapi_unregister();
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break;
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}
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case 2:
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{
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struct mapi_mheader_av2 *mheader = mod->mapi_header;
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/* XXX duplicate code :( */
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if(mheader->mapi_command_list)
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{
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struct Message **m;
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for (m = mheader->mapi_command_list; *m; ++m)
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mod_del_cmd(*m);
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}
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/* hook events are never removed, we simply lose the
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* ability to call them --fl
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*/
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if(mheader->mapi_hfn_list)
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{
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mapi_hfn_list_av1 *m;
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for (m = mheader->mapi_hfn_list; m->hapi_name; ++m)
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remove_hook(m->hapi_name, m->fn);
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}
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if(mheader->mapi_unregister)
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mheader->mapi_unregister();
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if(mheader->mapi_cap_list)
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{
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mapi_cap_list_av2 *m;
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for (m = mheader->mapi_cap_list; m->cap_name; ++m)
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{
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struct CapabilityIndex *idx;
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switch (m->cap_index)
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{
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case MAPI_CAP_CLIENT:
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idx = cli_capindex;
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break;
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case MAPI_CAP_SERVER:
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idx = serv_capindex;
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break;
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default:
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Unknown/unsupported CAP index found of type %d on capability %s when unloading %s",
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m->cap_index, m->cap_name, mod->name);
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ilog(L_MAIN,
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"Unknown/unsupported CAP index found of type %d on capability %s when unloading %s",
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m->cap_index, m->cap_name, mod->name);
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continue;
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}
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if (m->cap_id != NULL)
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{
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capability_orphan(idx, m->cap_name);
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sendto_local_clients_with_capability(CLICAP_CAP_NOTIFY, ":%s CAP * DEL :%s", me.name, m->cap_name);
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}
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}
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}
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break;
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}
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default:
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Unknown/unsupported MAPI version %d when unloading %s!",
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mod->mapi_version, mod->name);
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ilog(L_MAIN, "Unknown/unsupported MAPI version %d when unloading %s!",
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mod->mapi_version, mod->name);
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break;
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}
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lt_dlclose(mod->address);
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rb_dlinkDelete(&mod->node, &module_list);
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rb_free(mod->name);
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rb_free(mod);
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if(warn)
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{
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ilog(L_MAIN, "Module %s unloaded", name);
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sendto_realops_snomask(SNO_GENERAL, L_ALL, "Module %s unloaded", name);
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}
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return true;
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}
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/*
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* load_a_module()
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*
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* inputs - path name of module, bool to notice, int of origin, bool if core
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* output - false if error true if success
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* side effects - loads a module if successful
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*/
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bool
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load_a_module(const char *path, bool warn, int origin, bool core)
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{
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struct module *mod;
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lt_dlhandle tmpptr;
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char *mod_displayname, *c;
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const char *ver, *description = NULL;
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size_t module_ext_len = strlen(LT_MODULE_EXT);
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int *mapi_version;
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mod_displayname = rb_basename(path);
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/* Trim off the ending for the display name if we have to */
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if((c = rb_strcasestr(mod_displayname, LT_MODULE_EXT)) != NULL)
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*c = '\0';
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tmpptr = lt_dlopenext(path);
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if(tmpptr == NULL)
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{
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const char *err = lt_dlerror();
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Error loading module %s: %s", mod_displayname, err);
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ilog(L_MAIN, "Error loading module %s: %s", mod_displayname, err);
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rb_free(mod_displayname);
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return false;
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}
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/*
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* _mheader is actually a struct mapi_mheader_*, but mapi_version
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* is always the first member of this structure, so we treate it
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* as a single int in order to determine the API version.
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* -larne.
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*/
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mapi_version = (int *) (uintptr_t) lt_dlsym(tmpptr, "_mheader");
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if((mapi_version == NULL
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&& (mapi_version = (int *) (uintptr_t) lt_dlsym(tmpptr, "__mheader")) == NULL)
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|| MAPI_MAGIC(*mapi_version) != MAPI_MAGIC_HDR)
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{
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Data format error: module %s has no MAPI header.",
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mod_displayname);
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ilog(L_MAIN, "Data format error: module %s has no MAPI header.", mod_displayname);
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(void) lt_dlclose(tmpptr);
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rb_free(mod_displayname);
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return false;
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}
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switch (MAPI_VERSION(*mapi_version))
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{
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case 1:
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{
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struct mapi_mheader_av1 *mheader = (struct mapi_mheader_av1 *)(void *)mapi_version; /* see above */
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if(mheader->mapi_register && (mheader->mapi_register() == -1))
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{
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ilog(L_MAIN, "Module %s indicated failure during load.",
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mod_displayname);
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sendto_realops_snomask(SNO_GENERAL, L_ALL,
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"Module %s indicated failure during load.",
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mod_displayname);
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lt_dlclose(tmpptr);
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rb_free(mod_displayname);
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return false;
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}
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if(mheader->mapi_command_list)
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{
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struct Message **m;
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for (m = mheader->mapi_command_list; *m; ++m)
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mod_add_cmd(*m);
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}
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if(mheader->mapi_hook_list)
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{
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mapi_hlist_av1 *m;
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for (m = mheader->mapi_hook_list; m->hapi_name; ++m)
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*m->hapi_id = register_hook(m->hapi_name);
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}
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if(mheader->mapi_hfn_list)
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{
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mapi_hfn_list_av1 *m;
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for (m = mheader->mapi_hfn_list; m->hapi_name; ++m)
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add_hook(m->hapi_name, m->fn);
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}
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ver = mheader->mapi_module_version;
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break;
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}
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case 2:
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{
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struct mapi_mheader_av2 *mheader = (struct mapi_mheader_av2 *)(void *)mapi_version; /* see above */
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/* XXX duplicated code :( */
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if(mheader->mapi_register && (mheader->mapi_register() == -1))
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{
|
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ilog(L_MAIN, "Module %s indicated failure during load.",
|
|
mod_displayname);
|
|
sendto_realops_snomask(SNO_GENERAL, L_ALL,
|
|
"Module %s indicated failure during load.",
|
|
mod_displayname);
|
|
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_ALL,
|
|
"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)
|
|
add_hook(m->hapi_name, m->fn);
|
|
}
|
|
|
|
/* New in MAPI v2 - version replacement */
|
|
ver = mheader->mapi_module_version ? mheader->mapi_module_version : ircd_version;
|
|
description = mheader->mapi_module_description;
|
|
|
|
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_ALL,
|
|
"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;
|
|
sendto_local_clients_with_capability(CLICAP_CAP_NOTIFY, ":%s CAP * ADD :%s", me.name, m->cap_name);
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
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_ALL,
|
|
"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;
|
|
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_ALL,
|
|
"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_restart(void *unused)
|
|
{
|
|
unsigned int modnum = 0;
|
|
rb_dlink_node *ptr, *nptr;
|
|
|
|
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);
|
|
|
|
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));
|
|
}
|