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/*
Unix SMB/CIFS implementation.
module loading system
Copyright (C) Jelmer Vernooij 2002
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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "includes.h"
#ifdef HAVE_DLOPEN
int smb_load_module(const char *module_name)
{
void *handle;
init_module_function *init;
int status;
const char *error;
/* Always try to use LAZY symbol resolving; if the plugin has
* backwards compatibility, there might be symbols in the
* plugin referencing to old (removed) functions
*/
handle = sys_dlopen(module_name, RTLD_LAZY);
if(!handle) {
DEBUG(0, ("Error loading module '%s': %s\n", module_name, sys_dlerror()));
return False;
}
init = sys_dlsym(handle, "init_module");
/* we must check sys_dlerror() to determine if it worked, because
sys_dlsym() can validly return NULL */
error = sys_dlerror();
if (error) {
DEBUG(0, ("Error trying to resolve symbol 'init_module' in %s: %s\n", module_name, error));
return False;
}
status = init();
DEBUG(2, ("Module '%s' loaded\n", module_name));
return status;
}
/* Load all modules in list and return number of
* modules that has been successfully loaded */
int smb_load_modules(const char **modules)
{
int i;
int success = 0;
for(i = 0; modules[i]; i++){
if(smb_load_module(modules[i])) {
success++;
}
}
DEBUG(2, ("%d modules successfully loaded\n", success));
return success;
}
int smb_probe_module(const char *subsystem, const char *module)
{
pstring full_path;
/* Check for absolute path */
if(module[0] == '/')return smb_load_module(module);
pstrcpy(full_path, lib_path(subsystem));
pstrcat(full_path, "/");
pstrcat(full_path, module);
pstrcat(full_path, ".");
pstrcat(full_path, shlib_ext());
DEBUG(5, ("Probing module %s: Trying to load from %s\n", module, full_path));
return smb_load_module(full_path);
}
#else /* HAVE_DLOPEN */
int smb_load_module(const char *module_name)
{
DEBUG(0,("This samba executable has not been built with plugin support"));
return False;
}
int smb_load_modules(const char **modules)
{
DEBUG(0,("This samba executable has not been built with plugin support"));
return False;
}
int smb_probe_module(const char *subsystem, const char *module)
{
DEBUG(0,("This samba executable has not been built with plugin support, not probing"));
return False;
}
#endif /* HAVE_DLOPEN */
void init_modules(void)
{
/* FIXME: This can cause undefined symbol errors :
* smb_register_vfs() isn't available in nmbd, for example */
if(lp_preload_modules())
smb_load_modules(lp_preload_modules());
}
/*************************************************************************
* This functions /path/to/foobar.so -> foobar
************************************************************************/
void module_path_get_name(const char *path, pstring name)
{
char *s;
/* First, make the path relative */
s = strrchr(path, '/');
if(s) pstrcpy(name, s+1);
else pstrcpy(name, path);
if (dyn_SHLIBEXT && *dyn_SHLIBEXT && strlen(dyn_SHLIBEXT) < strlen(name)) {
int n = strlen(name) - strlen(dyn_SHLIBEXT);
/* Remove extension if necessary */
if (name[n-1] == '.' && !strcmp(name+n, dyn_SHLIBEXT)) {
name[n-1] = '\0';
}
}
}
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