plugin-feature: Function added to exactly compare plugin features

src/libstrongswan/plugins/plugin_feature.c

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012-2013 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * Copyright (C) 2011 Martin Willi
@@ -169,6 +169,55 @@ bool plugin_feature_matches(plugin_feature_t *a, plugin_feature_t *b)
 	return FALSE;
 }
 
+/**
+ * See header.
+ */
+bool plugin_feature_equals(plugin_feature_t *a, plugin_feature_t *b)
+{
+	if (a->type == b->type)
+	{
+		switch (a->type)
+		{
+			case FEATURE_NONE:
+			case FEATURE_CRYPTER:
+			case FEATURE_AEAD:
+			case FEATURE_SIGNER:
+			case FEATURE_HASHER:
+			case FEATURE_PRF:
+			case FEATURE_DH:
+			case FEATURE_NONCE_GEN:
+			case FEATURE_PRIVKEY:
+			case FEATURE_PRIVKEY_GEN:
+			case FEATURE_PUBKEY:
+			case FEATURE_PRIVKEY_SIGN:
+			case FEATURE_PUBKEY_VERIFY:
+			case FEATURE_PRIVKEY_DECRYPT:
+			case FEATURE_PUBKEY_ENCRYPT:
+			case FEATURE_CERT_DECODE:
+			case FEATURE_CERT_ENCODE:
+			case FEATURE_CONTAINER_DECODE:
+			case FEATURE_CONTAINER_ENCODE:
+			case FEATURE_EAP_SERVER:
+			case FEATURE_EAP_PEER:
+			case FEATURE_CUSTOM:
+			case FEATURE_XAUTH_SERVER:
+			case FEATURE_XAUTH_PEER:
+				return plugin_feature_matches(a, b);
+			case FEATURE_RNG:
+				return a->arg.rng_quality == b->arg.rng_quality;
+			case FEATURE_DATABASE:
+				return a->arg.database == b->arg.database;
+			case FEATURE_FETCHER:
+				if (a->arg.fetcher && b->arg.fetcher)
+				{
+					return streq(a->arg.fetcher, b->arg.fetcher);
+				}
+				return !a->arg.fetcher && !b->arg.fetcher;
+		}
+	}
+	return FALSE;
+}
+
 /**
  * See header.
  */

src/libstrongswan/plugins/plugin_feature.h

@@ -1,5 +1,5 @@
 /*
- * Copyright (C) 2012 Tobias Brunner
+ * Copyright (C) 2012-2013 Tobias Brunner
  * Hochschule fuer Technik Rapperswil
  *
  * Copyright (C) 2011 Martin Willi
@@ -340,12 +340,25 @@ u_int32_t plugin_feature_hash(plugin_feature_t *feature);
 /**
  * Check if feature a matches to feature b.
  *
+ * This is no check for equality.  For instance, for FEATURE_RNG a matches b if
+ * a's strength is at least the strength of b.  Or for FEATURE_SQL if a is
+ * DB_ANY it will match b if it is of the same type.
+ *
  * @param a			feature to check
  * @param b			feature to match against
  * @return			TRUE if a matches b
  */
 bool plugin_feature_matches(plugin_feature_t *a, plugin_feature_t *b);
 
+/**
+ * Check if feature a equals feature b.
+ *
+ * @param a			feature
+ * @param b			feature to compare
+ * @return			TRUE if a equals b
+ */
+bool plugin_feature_equals(plugin_feature_t *a, plugin_feature_t *b);
+
 /**
  * Get a string describing feature.
  *

src/libstrongswan/plugins/plugin_loader.c

@@ -179,7 +179,7 @@ static plugin_t *static_features_create(const char *name,
 /**
  * Compare function for hashtable of loaded features.
  */
-static bool plugin_feature_equals(plugin_feature_t *a, plugin_feature_t *b)
+static bool plugin_feature_equals_ptr(plugin_feature_t *a, plugin_feature_t *b)
 {
 	return a == b;
 }
@@ -850,7 +850,7 @@ plugin_loader_t *plugin_loader_create()
 		.plugins = linked_list_create(),
 		.loaded_features = hashtable_create(
 								(hashtable_hash_t)plugin_feature_hash,
-								(hashtable_equals_t)plugin_feature_equals, 64),
+								(hashtable_equals_t)plugin_feature_equals_ptr, 64),
 	);
 
 	return &this->public;