Add preliminary DNSCurve plugin.

Author: vstakhov

CMakeLists.txt

@@ -20,7 +20,8 @@ SET(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -g")
 
 SET(LIBRDNSSRC			src/dns_util.c
 						src/dns.c
-						src/punycode.c)
+						src/punycode.c
+						src/dns_curve.c)
 
 INCLUDE_DIRECTORIES("${CMAKE_SOURCE_DIR}/src" 
 					"${CMAKE_SOURCE_DIR}/include" 

include/rdns_curve.h

@@ -0,0 +1,62 @@
+/*
+ * Copyright (c) 2014, Vsevolod Stakhov
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *	 * Redistributions of source code must retain the above copyright
+ *	   notice, this list of conditions and the following disclaimer.
+ *	 * 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 AUTHOR ''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 AUTHOR 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 RDNS_CURVE_H_
+#define RDNS_CURVE_H_
+
+#define RDSN_CURVE_PUBKEY_LEN 32
+
+struct rdns_curve_ctx;
+
+/**
+ * Create new dnscurve ctx
+ * @return
+ */
+struct rdns_curve_ctx* rdns_curve_ctx_new (void);
+
+/**
+ * Add key for server `name`
+ * @param ctx curve context
+ * @param name name of server (ip address)
+ * @param pubkey pubkey bytes (must be `RDSN_CURVE_PUBKEY_LEN`)
+ */
+void rdns_curve_ctx_add_key (struct rdns_curve_ctx *ctx,
+		const char *name, const char *pubkey);
+
+/**
+ * Destroy curve context
+ * @param ctx
+ */
+void rdns_curve_ctx_destroy (struct rdns_curve_ctx *ctx);
+
+
+/**
+ * Register DNSCurve plugin (libsodium should be enabled for this)
+ * @param resolver
+ * @param ctx
+ */
+void rdns_curve_register_plugin (struct rdns_resolver *resolver,
+		struct rdns_curve_ctx *ctx);
+
+#endif /* RDNS_CURVE_H_ */

src/dns_curve.c

@@ -0,0 +1,85 @@
+/*
+ * Copyright (c) 2014, Vsevolod Stakhov
+ *
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *	 * Redistributions of source code must retain the above copyright
+ *	   notice, this list of conditions and the following disclaimer.
+ *	 * 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 AUTHOR ''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 AUTHOR 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.
+ */
+
+#include "rdns.h"
+#include "dns_private.h"
+#include "rdns_curve.h"
+
+struct rdns_curve_entry {
+	char *name;
+	char pubkey[RDSN_CURVE_PUBKEY_LEN];
+	UT_hash_handle hh;
+};
+
+struct rdns_curve_ctx {
+	struct rdns_curve_entry *entries;
+};
+
+struct rdns_curve_ctx*
+rdns_curve_ctx_new (void)
+{
+	struct rdns_curve_ctx *new;
+
+	new = calloc (1, sizeof (struct rdns_curve_ctx));
+
+	return new;
+}
+
+
+void
+rdns_curve_ctx_add_key (struct rdns_curve_ctx *ctx,
+		const char *name, const char *pubkey)
+{
+	struct rdns_curve_entry *entry;
+	int len;
+
+	len = strlen (pubkey);
+
+	if (len == RDSN_CURVE_PUBKEY_LEN) {
+		entry = malloc (sizeof (struct rdns_curve_entry));
+		entry->name = strdup (name);
+		memcpy (entry->pubkey, pubkey, sizeof (entry->pubkey));
+		HASH_ADD_KEYPTR (hh, ctx->entries, entry->name, strlen (entry->name), entry);
+	}
+}
+
+void rdns_curve_ctx_destroy (struct rdns_curve_ctx *ctx)
+{
+	struct rdns_curve_entry *entry, *tmp;
+
+	HASH_ITER (hh, ctx->entries, entry, tmp) {
+		free (entry->name);
+		free (entry);
+	}
+
+	free (ctx);
+}
+
+void
+rdns_curve_register_plugin (struct rdns_resolver *resolver,
+		struct rdns_curve_ctx *ctx)
+{
+
+}