Perform string-based lookup of method-related information only once

1 files changed, 77 insertions, 0 deletions

diff --git a/src/method.h b/src/method.h
new file mode 100644
index 0000000..b56db14
--- /dev/null
+++ b/src/method.h
@@ -0,0 +1,77 @@
+/*
+  Copyright (c) 2012-2013, Matthias Schiffer <mschiffer@universe-factory.net>
+  All rights reserved.
+
+  Redistribution and use in source and binary forms, with or without
+  modification, are permitted provided that the following conditions are met:
+
+    1. Redistributions of source code must retain the above copyright notice,
+       this list of conditions and the following disclaimer.
+    2. Redistributions in binary form must reproduce the above copyright notice,
+       this list of conditions and the following disclaimer in the documentation
+       and/or other materials provided with the distribution.
+
+  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+  DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+  FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+  DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+  SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+  CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+  OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+*/
+
+
+#ifndef _FASTD_METHOD_H_
+#define _FASTD_METHOD_H_
+
+#include "fastd.h"
+
+
+struct fastd_method_info {
+	const char *name;
+	const fastd_method_t *method;
+	fastd_method_context_t *ctx;
+};
+
+struct fastd_method {
+	size_t max_overhead;
+	size_t min_encrypt_head_space;
+	size_t min_decrypt_head_space;
+	size_t min_encrypt_tail_space;
+	size_t min_decrypt_tail_space;
+
+	bool (*create_by_name)(const char *name, fastd_method_context_t **method_ctx);
+	void (*destroy)(fastd_method_context_t *method_ctx);
+
+	size_t (*key_length)(fastd_context_t *ctx, const fastd_method_context_t *method_ctx);
+
+	fastd_method_session_state_t* (*session_init)(fastd_context_t *ctx, const fastd_method_context_t *method_ctx, const uint8_t *secret, bool initiator);
+	fastd_method_session_state_t* (*session_init_compat)(fastd_context_t *ctx, const fastd_method_context_t *method_ctx, const uint8_t *secret, size_t length, bool initiator);
+	bool (*session_is_valid)(fastd_context_t *ctx, fastd_method_session_state_t *session);
+	bool (*session_is_initiator)(fastd_context_t *ctx, fastd_method_session_state_t *session);
+	bool (*session_want_refresh)(fastd_context_t *ctx, fastd_method_session_state_t *session);
+	void (*session_superseded)(fastd_context_t *ctx, fastd_method_session_state_t *session);
+	void (*session_free)(fastd_context_t *ctx, fastd_method_session_state_t *session);
+
+	bool (*encrypt)(fastd_context_t *ctx, fastd_peer_t *peer, fastd_method_session_state_t *session, fastd_buffer_t *out, fastd_buffer_t in);
+	bool (*decrypt)(fastd_context_t *ctx, fastd_peer_t *peer, fastd_method_session_state_t *session, fastd_buffer_t *out, fastd_buffer_t in);
+};
+
+
+bool fastd_method_create_by_name(const char *name, const fastd_method_t **method, fastd_method_context_t **method_ctx);
+
+
+static inline const fastd_method_info_t* fastd_method_get_by_name(fastd_context_t *ctx, const char *name) {
+	size_t i;
+	for (i = 0; ctx->conf->methods[i].name; i++) {
+		if (!strcmp(ctx->conf->methods[i].name, name))
+			return &ctx->conf->methods[i];
+	}
+
+	return NULL;
+}
+
+#endif /* _FASTD_METHOD_H_ */