| 1 | /*
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| 2 | Unix SMB/CIFS implementation.
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| 3 | module loading system
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| 4 |
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| 5 | Copyright (C) Jelmer Vernooij 2002-2003
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| 6 | Copyright (C) Stefan (metze) Metzmacher 2003
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| 7 |
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| 8 | This program is free software; you can redistribute it and/or modify
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| 9 | it under the terms of the GNU General Public License as published by
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| 10 | the Free Software Foundation; either version 3 of the License, or
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| 11 | (at your option) any later version.
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| 12 |
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| 13 | This program is distributed in the hope that it will be useful,
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| 14 | but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 15 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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| 16 | GNU General Public License for more details.
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| 17 |
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| 18 | You should have received a copy of the GNU General Public License
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| 19 | along with this program. If not, see <http://www.gnu.org/licenses/>.
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| 20 | */
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| 21 |
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| 22 | #include "includes.h"
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| 23 |
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| 24 | #ifdef HAVE_DLOPEN
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| 25 |
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| 26 | /* Load a dynamic module. Only log a level 0 error if we are not checking
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| 27 | for the existence of a module (probling). */
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| 28 |
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| 29 | static NTSTATUS do_smb_load_module(const char *module_name, bool is_probe)
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| 30 | {
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| 31 | void *handle;
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| 32 | init_module_function *init;
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| 33 | NTSTATUS status;
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| 34 | const char *error;
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| 35 |
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| 36 | /* Always try to use LAZY symbol resolving; if the plugin has
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| 37 | * backwards compatibility, there might be symbols in the
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| 38 | * plugin referencing to old (removed) functions
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| 39 | */
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| 40 | handle = dlopen(module_name, RTLD_LAZY);
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| 41 |
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| 42 | /* This call should reset any possible non-fatal errors that
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| 43 | occured since last call to dl* functions */
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| 44 | error = dlerror();
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| 45 |
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| 46 | if(!handle) {
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| 47 | int level = is_probe ? 3 : 0;
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| 48 | DEBUG(level, ("Error loading module '%s': %s\n", module_name, error ? error : ""));
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| 49 | return NT_STATUS_UNSUCCESSFUL;
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| 50 | }
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| 51 |
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| 52 | init = (init_module_function *)dlsym(handle, "init_samba_module");
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| 53 |
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| 54 | /* we must check dlerror() to determine if it worked, because
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| 55 | dlsym() can validly return NULL */
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| 56 | error = dlerror();
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| 57 | if (error) {
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| 58 | DEBUG(0, ("Error trying to resolve symbol 'init_samba_module' "
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| 59 | "in %s: %s\n", module_name, error));
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| 60 | dlclose(handle);
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| 61 | return NT_STATUS_UNSUCCESSFUL;
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| 62 | }
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| 63 |
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| 64 | DEBUG(2, ("Module '%s' loaded\n", module_name));
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| 65 |
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| 66 | status = init();
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| 67 | if (!NT_STATUS_IS_OK(status)) {
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| 68 | DEBUG(0, ("Module '%s' initialization failed: %s\n",
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| 69 | module_name, get_friendly_nt_error_msg(status)));
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| 70 | dlclose(handle);
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| 71 | }
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| 72 |
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| 73 | return status;
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| 74 | }
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| 75 |
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| 76 | NTSTATUS smb_load_module(const char *module_name)
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| 77 | {
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| 78 | return do_smb_load_module(module_name, False);
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| 79 | }
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| 80 |
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| 81 | /* Load all modules in list and return number of
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| 82 | * modules that has been successfully loaded */
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| 83 | int smb_load_modules(const char **modules)
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| 84 | {
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| 85 | int i;
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