source3/lib/module.c

   1 /*
   2    Unix SMB/CIFS implementation.
   3    module loading system
   4
   5    Copyright (C) Jelmer Vernooij 2002
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  20 */
  21
  22 #include "includes.h"
  23
  24 #ifdef HAVE_DLOPEN
  25 NTSTATUS smb_load_module(const char *module_name)
  26 {
  27         void *handle;
  28         init_module_function *init;
  29         NTSTATUS nt_status;
  30         const char *error;
  31
  32         /* Always try to use LAZY symbol resolving; if the plugin has
  33          * backwards compatibility, there might be symbols in the
  34          * plugin referencing to old (removed) functions
  35          */
  36         handle = sys_dlopen(module_name, RTLD_LAZY);
  37
  38         if(!handle) {
  39                 DEBUG(0, ("Error loading module '%s': %s\n", module_name, sys_dlerror()));
  40                 return NT_STATUS_UNSUCCESSFUL;
  41         }
  42
  43         init = sys_dlsym(handle, "init_module");
  44
  45         /* we must check sys_dlerror() to determine if it worked, because
  46            sys_dlsym() can validly return NULL */
  47         error = sys_dlerror();
  48         if (error) {
  49                 DEBUG(0, ("Error trying to resolve symbol 'init_module' in %s: %s\n", module_name, error));
  50                 return NT_STATUS_UNSUCCESSFUL;
  51         }
  52
  53         nt_status = init();
  54
  55         DEBUG(2, ("Module '%s' loaded\n", module_name));
  56
  57         return nt_status;
  58 }
  59
  60 #else /* HAVE_DLOPEN */
  61
  62 NTSTATUS smb_load_module(const char *module_name)
  63 {
  64         DEBUG(0,("This samba executable has not been build with plugin support"));
  65         return NT_STATUS_NOT_SUPPORTED;
  66 }
  67
  68 #endif /* HAVE_DLOPEN */