mirror of
https://github.com/asterisk/asterisk.git
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b2a648b4da
git-svn-id: https://origsvn.digium.com/svn/asterisk/trunk@2197 65c4cc65-6c06-0410-ace0-fbb531ad65f3
497 lines
12 KiB
C
Executable File
497 lines
12 KiB
C
Executable File
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* Module Loader
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include <stdio.h>
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#include <dirent.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <string.h>
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#include <asterisk/module.h>
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#include <asterisk/options.h>
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#include <asterisk/config.h>
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#include <asterisk/logger.h>
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#include <asterisk/channel.h>
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#include <asterisk/term.h>
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#include <asterisk/manager.h>
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#include <asterisk/enum.h>
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#include <asterisk/rtp.h>
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#ifdef __APPLE__
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#include <asterisk/dlfcn-compat.h>
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#else
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#include <dlfcn.h>
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#endif
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#include <asterisk/md5.h>
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#include <pthread.h>
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#include "asterisk.h"
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#include "astconf.h"
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#ifndef RTLD_NOW
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#define RTLD_NOW 0
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#endif
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static char expected_key[] =
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{ 0x8e, 0x93, 0x22, 0x83, 0xf5, 0xc3, 0xc0, 0x75,
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0xff, 0x8b, 0xa9, 0xbe, 0x7c, 0x43, 0x74, 0x63 };
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struct module {
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int (*load_module)(void);
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int (*unload_module)(void);
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int (*usecount)(void);
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char *(*description)(void);
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char *(*key)(void);
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int (*reload)(void);
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void *lib;
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char resource[256];
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struct module *next;
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};
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static int printdigest(unsigned char *d)
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{
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int x;
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char buf[256];
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char buf2[16];
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snprintf(buf, sizeof(buf), "Unexpected signature:");
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for (x=0;x<16;x++) {
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snprintf(buf2, sizeof(buf2), " %02x", *(d++));
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strcat(buf, buf2);
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}
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strcat(buf, "\n");
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ast_log(LOG_DEBUG, buf);
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return 0;
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}
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static int key_matches(char *key1, char *key2)
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{
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int match = 1;
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int x;
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for (x=0;x<16;x++) {
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match &= (key1[x] == key2[x]);
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}
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return match;
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}
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static int verify_key(char *key)
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{
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struct MD5Context c;
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char digest[16];
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MD5Init(&c);
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MD5Update(&c, key, strlen(key));
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MD5Final(digest, &c);
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if (key_matches(expected_key, digest))
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return 0;
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printdigest(digest);
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return -1;
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}
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static struct loadupdate {
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int (*updater)(void);
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struct loadupdate *next;
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} *updaters = NULL;
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static ast_mutex_t modlock = AST_MUTEX_INITIALIZER;
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static ast_mutex_t reloadlock = AST_MUTEX_INITIALIZER;
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static struct module *module_list=NULL;
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int ast_unload_resource(char *resource_name, int force)
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{
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struct module *m, *ml = NULL;
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int res = -1;
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if (ast_mutex_lock(&modlock))
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ast_log(LOG_WARNING, "Failed to lock\n");
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m = module_list;
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while(m) {
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if (!strcasecmp(m->resource, resource_name)) {
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if ((res = m->usecount()) > 0) {
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if (force)
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ast_log(LOG_WARNING, "Warning: Forcing removal of module %s with use count %d\n", resource_name, res);
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else {
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ast_log(LOG_WARNING, "Soft unload failed, '%s' has use count %d\n", resource_name, res);
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ast_mutex_unlock(&modlock);
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return -1;
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}
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}
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res = m->unload_module();
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if (res) {
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ast_log(LOG_WARNING, "Firm unload failed for %s\n", resource_name);
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if (force <= AST_FORCE_FIRM) {
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ast_mutex_unlock(&modlock);
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return -1;
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} else
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ast_log(LOG_WARNING, "** Dangerous **: Unloading resource anyway, at user request\n");
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}
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if (ml)
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ml->next = m->next;
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else
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module_list = m->next;
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dlclose(m->lib);
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free(m);
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break;
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}
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ml = m;
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m = m->next;
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}
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ast_mutex_unlock(&modlock);
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ast_update_use_count();
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return res;
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}
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void ast_module_reload(void)
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{
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struct module *m;
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/* We'll do the logger and manager the favor of calling its reload here first */
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if (ast_mutex_trylock(&reloadlock)) {
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ast_verbose("The previous reload command didn't finish yet\n");
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return;
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}
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reload_manager();
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ast_enum_reload();
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ast_rtp_reload();
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time(&ast_lastreloadtime);
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ast_mutex_lock(&modlock);
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m = module_list;
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while(m) {
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if (m->reload) {
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if (option_verbose > 2)
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ast_verbose(VERBOSE_PREFIX_3 "Reloading module '%s' (%s)\n", m->resource, m->description());
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m->reload();
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}
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m = m->next;
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}
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ast_mutex_unlock(&modlock);
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ast_mutex_unlock(&reloadlock);
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}
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int ast_load_resource(char *resource_name)
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{
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static char fn[256];
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int errors=0;
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int res;
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struct module *m;
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int flags=RTLD_NOW;
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#ifdef RTLD_GLOBAL
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char *val;
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#endif
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char *key;
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int o;
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struct ast_config *cfg;
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char tmp[80];
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/* Keep the module file parsing silent */
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o = option_verbose;
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if (strncasecmp(resource_name, "res_", 4)) {
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option_verbose = 0;
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cfg = ast_load(AST_MODULE_CONFIG);
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option_verbose = o;
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if (cfg) {
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#ifdef RTLD_GLOBAL
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if ((val = ast_variable_retrieve(cfg, "global", resource_name))
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&& ast_true(val))
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flags |= RTLD_GLOBAL;
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#endif
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ast_destroy(cfg);
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}
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} else {
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/* Resource modules are always loaded global and lazy */
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#ifdef RTLD_GLOBAL
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flags = (RTLD_GLOBAL | RTLD_LAZY);
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#else
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flags = RTLD_LAZY;
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#endif
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}
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if (ast_mutex_lock(&modlock))
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ast_log(LOG_WARNING, "Failed to lock\n");
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m = module_list;
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while(m) {
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if (!strcasecmp(m->resource, resource_name)) {
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ast_log(LOG_WARNING, "Module '%s' already exists\n", resource_name);
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ast_mutex_unlock(&modlock);
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return -1;
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}
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m = m->next;
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}
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m = malloc(sizeof(struct module));
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if (!m) {
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ast_log(LOG_WARNING, "Out of memory\n");
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ast_mutex_unlock(&modlock);
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return -1;
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}
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strncpy(m->resource, resource_name, sizeof(m->resource)-1);
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if (resource_name[0] == '/') {
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strncpy(fn, resource_name, sizeof(fn)-1);
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} else {
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snprintf(fn, sizeof(fn), "%s/%s", (char *)ast_config_AST_MODULE_DIR, resource_name);
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}
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m->lib = dlopen(fn, flags);
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if (!m->lib) {
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ast_log(LOG_WARNING, "%s\n", dlerror());
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free(m);
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ast_mutex_unlock(&modlock);
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return -1;
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}
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m->load_module = dlsym(m->lib, "load_module");
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if (m->load_module == NULL)
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m->load_module = dlsym(m->lib, "_load_module");
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if (!m->load_module) {
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ast_log(LOG_WARNING, "No load_module in module %s\n", fn);
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errors++;
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}
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m->unload_module = dlsym(m->lib, "unload_module");
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if (m->unload_module == NULL)
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m->unload_module = dlsym(m->lib, "_unload_module");
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if (!m->unload_module) {
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ast_log(LOG_WARNING, "No unload_module in module %s\n", fn);
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errors++;
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}
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m->usecount = dlsym(m->lib, "usecount");
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if (m->usecount == NULL)
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m->usecount = dlsym(m->lib, "_usecount");
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if (!m->usecount) {
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ast_log(LOG_WARNING, "No usecount in module %s\n", fn);
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errors++;
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}
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m->description = dlsym(m->lib, "description");
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if (m->description == NULL)
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m->description = dlsym(m->lib, "_description");
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if (!m->description) {
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ast_log(LOG_WARNING, "No description in module %s\n", fn);
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errors++;
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}
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m->key = dlsym(m->lib, "key");
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if (m->key == NULL)
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m->key = dlsym(m->lib, "_key");
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if (!m->key) {
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ast_log(LOG_WARNING, "No key routine in module %s\n", fn);
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errors++;
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}
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m->reload = dlsym(m->lib, "reload");
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if (m->reload == NULL)
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m->reload = dlsym(m->lib, "_reload");
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if (m->key && !(key = m->key())) {
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ast_log(LOG_WARNING, "Key routine returned NULL in module %s\n", fn);
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errors++;
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} else
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key = NULL;
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if (key && verify_key(key)) {
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ast_log(LOG_WARNING, "Unexpected key returned by module %s\n", fn);
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errors++;
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}
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if (errors) {
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ast_log(LOG_WARNING, "%d error(s) loading module %s, aborted\n", errors, fn);
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dlclose(m->lib);
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free(m);
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ast_mutex_unlock(&modlock);
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return -1;
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}
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if (!fully_booted) {
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if (option_verbose)
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ast_verbose( " => (%s)\n", term_color(tmp, m->description(), COLOR_BROWN, COLOR_BLACK, sizeof(tmp)));
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if (option_console && !option_verbose)
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ast_verbose( ".");
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} else {
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if (option_verbose)
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ast_verbose(VERBOSE_PREFIX_1 "Loaded %s => (%s)\n", fn, m->description());
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}
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m->next = module_list;
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module_list = m;
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ast_mutex_unlock(&modlock);
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if ((res = m->load_module())) {
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ast_log(LOG_WARNING, "%s: load_module failed, returning %d\n", m->resource, res);
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ast_unload_resource(resource_name, 0);
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return -1;
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}
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ast_update_use_count();
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return 0;
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}
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static int ast_resource_exists(char *resource)
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{
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struct module *m;
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if (ast_mutex_lock(&modlock))
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ast_log(LOG_WARNING, "Failed to lock\n");
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m = module_list;
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while(m) {
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if (!strcasecmp(resource, m->resource))
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break;
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m = m->next;
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}
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ast_mutex_unlock(&modlock);
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if (m)
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return -1;
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else
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return 0;
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}
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int load_modules()
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{
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struct ast_config *cfg;
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struct ast_variable *v;
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char tmp[80];
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if (option_verbose)
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ast_verbose( "Asterisk Dynamic Loader Starting:\n");
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cfg = ast_load(AST_MODULE_CONFIG);
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if (cfg) {
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/* Load explicitly defined modules */
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v = ast_variable_browse(cfg, "modules");
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while(v) {
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if (!strcasecmp(v->name, "load")) {
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if (option_debug && !option_verbose)
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ast_log(LOG_DEBUG, "Loading module %s\n", v->value);
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if (option_verbose) {
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ast_verbose( VERBOSE_PREFIX_1 "[%s]", term_color(tmp, v->value, COLOR_BRWHITE, 0, sizeof(tmp)));
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fflush(stdout);
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}
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if (ast_load_resource(v->value)) {
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ast_log(LOG_WARNING, "Loading module %s failed!\n", v->value);
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if (cfg)
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ast_destroy(cfg);
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return -1;
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}
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}
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v=v->next;
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}
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}
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if (!cfg || ast_true(ast_variable_retrieve(cfg, "modules", "autoload"))) {
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/* Load all modules */
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DIR *mods;
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struct dirent *d;
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int x;
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/* Make two passes. First, load any resource modules, then load the others. */
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for (x=0;x<2;x++) {
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mods = opendir((char *)ast_config_AST_MODULE_DIR);
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if (mods) {
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while((d = readdir(mods))) {
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/* Must end in .so to load it. */
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if ((strlen(d->d_name) > 3) && (x || !strncasecmp(d->d_name, "res_", 4)) &&
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!strcasecmp(d->d_name + strlen(d->d_name) - 3, ".so") &&
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!ast_resource_exists(d->d_name)) {
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/* It's a shared library -- Just be sure we're allowed to load it -- kinda
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an inefficient way to do it, but oh well. */
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if (cfg) {
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v = ast_variable_browse(cfg, "modules");
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while(v) {
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if (!strcasecmp(v->name, "noload") &&
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!strcasecmp(v->value, d->d_name))
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break;
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v = v->next;
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}
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if (v) {
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if (option_verbose) {
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ast_verbose( VERBOSE_PREFIX_1 "[skipping %s]\n", d->d_name);
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fflush(stdout);
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}
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continue;
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}
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}
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if (option_debug && !option_verbose)
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ast_log(LOG_DEBUG, "Loading module %s\n", d->d_name);
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if (option_verbose) {
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ast_verbose( VERBOSE_PREFIX_1 "[%s]", term_color(tmp, d->d_name, COLOR_BRWHITE, 0, sizeof(tmp)));
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fflush(stdout);
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}
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if (ast_load_resource(d->d_name)) {
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ast_log(LOG_WARNING, "Loading module %s failed!\n", d->d_name);
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if (cfg)
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ast_destroy(cfg);
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return -1;
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}
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}
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}
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closedir(mods);
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} else {
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if (!option_quiet)
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ast_log(LOG_WARNING, "Unable to open modules directory %s.\n", (char *)ast_config_AST_MODULE_DIR);
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}
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}
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}
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ast_destroy(cfg);
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return 0;
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}
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void ast_update_use_count(void)
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{
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/* Notify any module monitors that the use count for a
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resource has changed */
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struct loadupdate *m;
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if (ast_mutex_lock(&modlock))
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ast_log(LOG_WARNING, "Failed to lock\n");
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m = updaters;
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while(m) {
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m->updater();
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m = m->next;
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}
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ast_mutex_unlock(&modlock);
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}
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int ast_update_module_list(int (*modentry)(char *module, char *description, int usecnt))
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{
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struct module *m;
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int unlock = -1;
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if (ast_mutex_trylock(&modlock))
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unlock = 0;
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m = module_list;
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while(m) {
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modentry(m->resource, m->description(), m->usecount());
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m = m->next;
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}
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if (unlock)
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ast_mutex_unlock(&modlock);
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return 0;
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}
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int ast_loader_register(int (*v)(void))
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{
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struct loadupdate *tmp;
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/* XXX Should be more flexible here, taking > 1 verboser XXX */
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if ((tmp = malloc(sizeof (struct loadupdate)))) {
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tmp->updater = v;
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if (ast_mutex_lock(&modlock))
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ast_log(LOG_WARNING, "Failed to lock\n");
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tmp->next = updaters;
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updaters = tmp;
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ast_mutex_unlock(&modlock);
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return 0;
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}
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return -1;
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}
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int ast_loader_unregister(int (*v)(void))
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{
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int res = -1;
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struct loadupdate *tmp, *tmpl=NULL;
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if (ast_mutex_lock(&modlock))
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ast_log(LOG_WARNING, "Failed to lock\n");
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tmp = updaters;
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while(tmp) {
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if (tmp->updater == v) {
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if (tmpl)
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tmpl->next = tmp->next;
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else
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updaters = tmp->next;
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break;
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}
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tmpl = tmp;
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tmp = tmp->next;
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}
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if (tmp)
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res = 0;
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ast_mutex_unlock(&modlock);
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return res;
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}
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