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plugin-loader: Properly support compilation without dlopen()/dlsym() etc.

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This only works if plugins are built monolithically and linked statically.

Closes strongswan/strongswan#2615
This commit is contained in:
Tobias Brunner
2025-01-13 17:51:14 +01:00
parent 41538cf259
commit d860c26e95
1 changed files with 24 additions and 4 deletions
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src/libstrongswan/plugins/plugin_loader.c
+24 -4
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@@ -191,10 +191,12 @@ struct plugin_entry_t {
*/
bool critical;
#ifdef HAVE_DLADDR
/**
* dlopen handle, if in separate lib
*/
void *handle;
#endif
/**
* List of features, as provided_feature_t
@@ -208,10 +210,12 @@ struct plugin_entry_t {
static void plugin_entry_destroy(plugin_entry_t *entry)
{
DESTROY_IF(entry->plugin);
#ifdef HAVE_DLADDR
if (entry->handle)
{
dlclose(entry->handle);
}
#endif
entry->features->destroy(entry->features);
free(entry);
}
@@ -369,11 +373,14 @@ static status_t create_plugin(private_plugin_loader_t *this, void *handle,
{
constructor = plugin_constructors->get(plugin_constructors, name);
}
#elif defined(HAVE_DLADDR)
if (!constructor)
#endif
{
constructor = dlsym(handle, create);
}
#else
#error Neither dynamic linking nor static plugin constructors are supported!
#endif
if (!constructor)
{
return NOT_FOUND;
@@ -412,8 +419,12 @@ static plugin_entry_t *load_plugin(private_plugin_loader_t *this, char *name,
{
char create[128];
plugin_entry_t *entry;
void *handle;
void *handle = NULL;
#ifdef HAVE_DLADDR
int flag = RTLD_LAZY;
handle = RTLD_DEFAULT;
#endif
if (snprintf(create, sizeof(create), "%s_plugin_create",
name) >= sizeof(create))
@@ -421,7 +432,7 @@ static plugin_entry_t *load_plugin(private_plugin_loader_t *this, char *name,
return NULL;
}
translate(create, "-", "_");
switch (create_plugin(this, RTLD_DEFAULT, name, create, FALSE, critical,
switch (create_plugin(this, handle, name, create, FALSE, critical,
&entry))
{
case SUCCESS:
@@ -447,6 +458,7 @@ static plugin_entry_t *load_plugin(private_plugin_loader_t *this, char *name,
return NULL;
}
}
#ifdef HAVE_DLADDR
if (lib->settings->get_bool(lib->settings, "%s.dlopen_use_rtld_now",
FALSE, lib->ns))
{
@@ -480,6 +492,9 @@ static plugin_entry_t *load_plugin(private_plugin_loader_t *this, char *name,
entry->handle = handle;
this->plugins->insert_last(this->plugins, entry);
return entry;
#else
return NULL;
#endif
}
CALLBACK(feature_filter, bool,
@@ -1347,10 +1362,12 @@ METHOD(plugin_loader_t, unload, void,
unload_features(this);
while (this->plugins->remove_last(this->plugins, (void**)&entry) == SUCCESS)
{
#ifdef HAVE_DLADDR
if (lib->leak_detective)
{ /* keep handle to report leaks properly */
entry->handle = NULL;
}
#endif
unregister_features(this, entry);
plugin_entry_destroy(entry);
}
@@ -1474,9 +1491,12 @@ plugin_loader_t *plugin_loader_create()
.features = hashlist_create(
(hashtable_hash_t)registered_feature_hash,
(hashtable_equals_t)registered_feature_equals, 64),
.get_features = dlsym(RTLD_DEFAULT, "plugin_loader_feature_filter"),
);
#ifdef HAVE_DLADDR
this->get_features = dlsym(RTLD_DEFAULT, "plugin_loader_feature_filter");
#endif
if (!this->get_features)
{
this->get_features = get_features_default;