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https://github.com/samba-team/samba.git
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fe0706d5d5
Add some 'multi init' code, until we get a better set of infrustructure.
Andrew Bartlett
(This used to be commit 982422b2d2
)
168 lines
4.1 KiB
C
168 lines
4.1 KiB
C
/*
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Unix SMB/CIFS implementation.
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module loading system
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Copyright (C) Jelmer Vernooij 2002-2004
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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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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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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., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "includes.h"
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#ifdef HAVE_DLOPEN
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/* Load module (or directory with modules) recursively.
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* Includes running the init_module() function */
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NTSTATUS smb_load_module(const char *module_name)
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{
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void *handle;
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init_module_function init;
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NTSTATUS status;
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const char *error;
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struct stat st;
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DIR *dir;
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struct dirent *dirent;
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if(stat(module_name, &st) < 0) {
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DEBUG(0, ("Can't stat module '%s'\n", module_name));
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return NT_STATUS_UNSUCCESSFUL;
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}
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/* If the argument is a directory, recursively load all files /
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* directories in it */
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/* How about symlinks pointing to themselves - wouldn't we rather
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* want to use wildcards here? */
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if(S_ISDIR(st.st_mode)) {
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dir = opendir(module_name);
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while ((dirent = readdir(dir))) {
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smb_load_module(dirent->d_name);
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}
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}
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/* Always try to use LAZY symbol resolving; if the plugin has
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* backwards compatibility, there might be symbols in the
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* plugin referencing to old (removed) functions
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*/
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handle = sys_dlopen(module_name, RTLD_LAZY);
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if(!handle) {
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DEBUG(0, ("Error loading module '%s': %s\n", module_name, sys_dlerror()));
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return NT_STATUS_UNSUCCESSFUL;
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}
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init = (init_module_function)sys_dlsym(handle, "init_module");
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/* we must check sys_dlerror() to determine if it worked, because
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sys_dlsym() can validly return NULL */
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error = sys_dlerror();
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if (error) {
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DEBUG(0, ("Error trying to resolve symbol 'init_module' in %s: %s\n", module_name, error));
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return NT_STATUS_UNSUCCESSFUL;
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}
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status = init();
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DEBUG(2, ("Module '%s' loaded\n", module_name));
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return status;
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}
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/* Load all modules in list and return number of
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* modules that has been successfully loaded */
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int smb_load_modules(const char **modules)
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{
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int i;
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int success = 0;
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for(i = 0; modules[i]; i++){
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if(NT_STATUS_IS_OK(smb_load_module(modules[i]))) {
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success++;
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}
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}
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DEBUG(2, ("%d modules successfully loaded\n", success));
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return success;
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}
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#else /* HAVE_DLOPEN */
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NTSTATUS smb_load_module(const char *module_name)
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{
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DEBUG(0,("This samba executable has not been built with plugin support\n"));
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return NT_STATUS_NOT_SUPPORTED;
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}
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int smb_load_modules(const char **modules)
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{
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DEBUG(0,("This samba executable has not been built with plugin support\n"));
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return -1;
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}
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#endif /* HAVE_DLOPEN */
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void init_modules(void)
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{
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if(lp_preload_modules())
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smb_load_modules(lp_preload_modules());
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}
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struct subsystem {
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char *name;
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register_backend_function callback;
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struct subsystem *prev, *next;
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};
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static struct subsystem *subsystems = NULL;
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NTSTATUS register_subsystem(const char *name, register_backend_function callback)
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{
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struct subsystem *s;
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struct subsystem *t = subsystems;
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while(t) {
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if(!strcmp(name, t->name)) {
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/* its already registered! */
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DEBUG(0,("Subsystem '%s' already registered\n", name));
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return NT_STATUS_OBJECT_NAME_COLLISION;
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}
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t = t->next;
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}
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s = smb_xmalloc(sizeof(struct subsystem));
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s->name = smb_xstrdup(name);
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s->callback = callback;
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s->prev = s->next = NULL;
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DLIST_ADD(subsystems, s);
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return NT_STATUS_OK;
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}
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NTSTATUS register_backend(const char *subsystem, const void *args)
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{
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/* Find the specified subsystem */
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struct subsystem *s = subsystems;
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while(s) {
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if(!strcmp(subsystem, s->name)) return s->callback(args);
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s = s->next;
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}
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return NT_STATUS_NOT_IMPLEMENTED;
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}
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