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settings: refactor load_plugins() to remote a harmful use of goto

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Turn the plugin loading logic between load_plugin: and next: into a
subroutine.
This commit is contained in:
Lubomir Rintel 2018-05-28 12:12:39 +02:00
parent 851d89dc6a
commit fd86a1aebb
1 changed files with 77 additions and 71 deletions
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148
src/settings/nm-settings.c
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@ -666,6 +666,75 @@ find_plugin (GSList *list, const char *pname)
return obj;
}
static gboolean
load_plugin (NMSettings *self, GSList *list, const char *pname, GError **error)
{
gs_free char *full_name = NULL;
gs_free char *path = NULL;
gs_unref_object GObject *obj = NULL;
GModule *plugin;
GObject * (*factory_func) (void);
struct stat st;
int errsv;
full_name = g_strdup_printf ("nm-settings-plugin-%s", pname);
path = g_module_build_path (NMPLUGINDIR, full_name);
if (stat (path, &st) != 0) {
errsv = errno;
_LOGW ("could not load plugin '%s' from file '%s': %s", pname, path, strerror (errsv));
return TRUE;
}
if (!S_ISREG (st.st_mode)) {
_LOGW ("could not load plugin '%s' from file '%s': not a file", pname, path);
return TRUE;
}
if (st.st_uid != 0) {
_LOGW ("could not load plugin '%s' from file '%s': file must be owned by root", pname, path);
return TRUE;
}
if (st.st_mode & (S_IWGRP | S_IWOTH | S_ISUID)) {
_LOGW ("could not load plugin '%s' from file '%s': invalid file permissions", pname, path);
return TRUE;
}
plugin = g_module_open (path, G_MODULE_BIND_LOCAL);
if (!plugin) {
_LOGW ("could not load plugin '%s' from file '%s': %s",
pname, path, g_module_error ());
return TRUE;
}
/* errors after this point are fatal, because we loaded the shared library already. */
if (!g_module_symbol (plugin, "nm_settings_plugin_factory", (gpointer) (&factory_func))) {
g_set_error (error, NM_SETTINGS_ERROR, NM_SETTINGS_ERROR_FAILED,
"Could not find plugin '%s' factory function.",
pname);
g_module_close (plugin);
return FALSE;
}
/* after accessing the plugin we cannot unload it anymore, because the glib
* types cannot be properly unregistered. */
g_module_make_resident (plugin);
obj = (*factory_func) ();
if (!obj || !NM_IS_SETTINGS_PLUGIN (obj)) {
g_set_error (error, NM_SETTINGS_ERROR, NM_SETTINGS_ERROR_FAILED,
"Plugin '%s' returned invalid system config object.",
pname);
return FALSE;
}
g_object_set_qdata_full (obj, plugin_module_path_quark (), path, g_free);
path = NULL;
if (add_plugin (self, NM_SETTINGS_PLUGIN (obj)))
list = g_slist_append (list, g_steal_pointer (&obj));
return TRUE;
}
static void
add_keyfile_plugin (NMSettings *self)
{
@ -696,7 +765,6 @@ load_plugins (NMSettings *self, const char **plugins, GError **error)
for (iter = plugins; iter && *iter; iter++) {
const char *pname = *iter;
GObject *obj;
if (!*pname || strchr (pname, '/')) {
_LOGW ("ignore invalid plugin \"%s\"", pname);
@ -731,83 +799,21 @@ load_plugins (NMSettings *self, const char **plugins, GError **error)
}
if (find_plugin (list, pname))
continue;
return TRUE;
load_plugin:
{
GModule *plugin;
gs_free char *full_name = NULL;
gs_free char *path = NULL;
GObject * (*factory_func) (void);
struct stat st;
int errsv;
success = load_plugin (self, list, pname, error);
if (!success)
break;
full_name = g_strdup_printf ("nm-settings-plugin-%s", pname);
path = g_module_build_path (NMPLUGINDIR, full_name);
if (stat (path, &st) != 0) {
errsv = errno;
_LOGW ("could not load plugin '%s' from file '%s': %s", pname, path, strerror (errsv));
goto next;
}
if (!S_ISREG (st.st_mode)) {
_LOGW ("could not load plugin '%s' from file '%s': not a file", pname, path);
goto next;
}
if (st.st_uid != 0) {
_LOGW ("could not load plugin '%s' from file '%s': file must be owned by root", pname, path);
goto next;
}
if (st.st_mode & (S_IWGRP | S_IWOTH | S_ISUID)) {
_LOGW ("could not load plugin '%s' from file '%s': invalid file permissions", pname, path);
goto next;
}
plugin = g_module_open (path, G_MODULE_BIND_LOCAL);
if (!plugin) {
_LOGW ("could not load plugin '%s' from file '%s': %s",
pname, path, g_module_error ());
goto next;
}
/* errors after this point are fatal, because we loaded the shared library already. */
if (!g_module_symbol (plugin, "nm_settings_plugin_factory", (gpointer) (&factory_func))) {
g_set_error (error, NM_SETTINGS_ERROR, NM_SETTINGS_ERROR_FAILED,
"Could not find plugin '%s' factory function.",
pname);
success = FALSE;
g_module_close (plugin);
break;
}
/* after accessing the plugin we cannot unload it anymore, because the glib
* types cannot be properly unregistered. */
g_module_make_resident (plugin);
obj = (*factory_func) ();
if (!obj || !NM_IS_SETTINGS_PLUGIN (obj)) {
g_set_error (error, NM_SETTINGS_ERROR, NM_SETTINGS_ERROR_FAILED,
"Plugin '%s' returned invalid system config object.",
pname);
success = FALSE;
break;
}
g_object_set_qdata_full (obj, plugin_module_path_quark (), path, g_free);
path = NULL;
if (add_plugin (self, NM_SETTINGS_PLUGIN (obj)))
list = g_slist_append (list, obj);
else
g_object_unref (obj);
}
next:
if (add_ibft && !strcmp (pname, "ifcfg-rh")) {
/* The plugin ibft is not explicitly mentioned but we just enabled "ifcfg-rh".
* Enable "ibft" by default after "ifcfg-rh". */
pname = "ibft";
add_ibft = FALSE;
goto load_plugin;
success = load_plugin (self, list, "ibft", error);
if (!success)
break;
}
}