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Diffstat (limited to 'source3/lib/module.c')
| -rw-r--r-- | source3/lib/module.c | 166 |
1 files changed, 166 insertions, 0 deletions
diff --git a/source3/lib/module.c b/source3/lib/module.c new file mode 100644 index 0000000000..76983387ff --- /dev/null +++ b/source3/lib/module.c @@ -0,0 +1,166 @@ +/* + Unix SMB/CIFS implementation. + module loading system + + Copyright (C) Jelmer Vernooij 2002-2003 + Copyright (C) Stefan (metze) Metzmacher 2003 + + 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 3 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, see <http://www.gnu.org/licenses/>. +*/ + +#include "includes.h" + +#ifdef HAVE_DLOPEN + +/* Load a dynamic module. Only log a level 0 error if we are not checking + for the existence of a module (probling). */ + +static NTSTATUS do_smb_load_module(const char *module_name, bool is_probe) +{ + void *handle; + init_module_function *init; + NTSTATUS 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); + + /* This call should reset any possible non-fatal errors that + occured since last call to dl* functions */ + error = sys_dlerror(); + + if(!handle) { + int level = is_probe ? 3 : 0; + DEBUG(level, ("Error loading module '%s': %s\n", module_name, error ? error : "")); + return NT_STATUS_UNSUCCESSFUL; + } + + init = (init_module_function *)sys_dlsym(handle, "init_samba_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_samba_module' " + "in %s: %s\n", module_name, error)); + sys_dlclose(handle); + return NT_STATUS_UNSUCCESSFUL; + } + + DEBUG(2, ("Module '%s' loaded\n", module_name)); + + status = init(); + if (!NT_STATUS_IS_OK(status)) { + DEBUG(0, ("Module '%s' initialization failed: %s\n", + module_name, get_friendly_nt_error_msg(status))); + sys_dlclose(handle); + } + + return status; +} + +NTSTATUS smb_load_module(const char *module_name) +{ + return do_smb_load_module(module_name, False); +} + +/* 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(NT_STATUS_IS_OK(smb_load_module(modules[i]))) { + success++; + } + } + + DEBUG(2, ("%d modules successfully loaded\n", success)); + + return success; +} + +NTSTATUS smb_probe_module(const char *subsystem, const char *module) +{ + char *full_path = NULL; + TALLOC_CTX *ctx = talloc_stackframe(); + NTSTATUS status; + + /* Check for absolute path */ + + /* if we make any 'samba multibyte string' + calls here, we break + for loading string modules */ + + DEBUG(5, ("Probing module '%s'\n", module)); + + if (module[0] == '/') { + status = do_smb_load_module(module, True); + TALLOC_FREE(ctx); + return status; + } + + full_path = talloc_asprintf(ctx, + "%s/%s.%s", + modules_path(subsystem), + module, + shlib_ext()); + if (!full_path) { + TALLOC_FREE(ctx); + return NT_STATUS_NO_MEMORY; + } + + DEBUG(5, ("Probing module '%s': Trying to load from %s\n", + module, full_path)); + + status = do_smb_load_module(full_path, True); + + TALLOC_FREE(ctx); + return status; +} + +#else /* HAVE_DLOPEN */ + +NTSTATUS smb_load_module(const char *module_name) +{ + DEBUG(0,("This samba executable has not been built with plugin support\n")); + return NT_STATUS_NOT_SUPPORTED; +} + +int smb_load_modules(const char **modules) +{ + DEBUG(0,("This samba executable has not been built with plugin support\n")); + return -1; +} + +NTSTATUS smb_probe_module(const char *subsystem, const char *module) +{ + DEBUG(0,("This samba executable has not been built with plugin support, not probing\n")); + return NT_STATUS_NOT_SUPPORTED; +} + +#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()); +} |