From cef7ba6f7024a2c3a53760be8c5fc4f937e8efb5 Mon Sep 17 00:00:00 2001
From: Paul Selkirk <paul@psgd.org>
Date: Thu, 25 Feb 2016 17:27:33 -0500
Subject: RPC over loopback socket, just to work out the mechanics for
 serialization and dispatch.

---
 rpc_server_loopback.c | 89 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 89 insertions(+)
 create mode 100644 rpc_server_loopback.c

(limited to 'rpc_server_loopback.c')

diff --git a/rpc_server_loopback.c b/rpc_server_loopback.c
new file mode 100644
index 0000000..a39e12b
--- /dev/null
+++ b/rpc_server_loopback.c
@@ -0,0 +1,89 @@
+/*
+ * rpc_server_loopback.c
+ * ---------------------
+ * Remote procedure call transport over loopback socket.
+ *
+ * Copyright (c) 2016, NORDUnet A/S 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.
+ *
+ * - Neither the name of the NORDUnet nor the names of its contributors may
+ *   be used to endorse or promote products derived from this software
+ *   without specific prior written permission.
+ *
+ * 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.
+ */
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <unistd.h>	/* close */
+
+#include "hal.h"
+#include "hal_internal.h"
+
+static int sock;
+
+hal_error_t rpc_server_transport_init(void)
+{
+    struct sockaddr_in sin;
+
+    sock = socket(AF_INET, SOCK_DGRAM, 0);
+    if (sock == -1)
+	return perror("socket"), HAL_ERROR_RPC_TRANSPORT;
+    sin.sin_family = AF_INET;
+    sin.sin_addr.s_addr = htonl(INADDR_LOOPBACK);
+    sin.sin_port = 17425;
+    if (bind(sock, (const struct sockaddr *)&sin, sizeof(sin)) != 0)
+	return perror("bind"), HAL_ERROR_RPC_TRANSPORT;
+    return HAL_OK;
+}
+
+hal_error_t rpc_server_transport_close(void)
+{
+    if (close(sock) != 0)
+	return perror("close"), HAL_ERROR_RPC_TRANSPORT;
+    return HAL_OK;
+}
+
+hal_error_t rpc_sendto(const uint8_t * const buf, const size_t len, void *opaque)
+{
+    struct sockaddr_in *sin = (struct sockaddr_in *)opaque;
+    int ret;
+
+    if ((ret = sendto(sock, buf, len, 0, (struct sockaddr *)sin, sizeof(*sin))) == -1)
+	return perror("sendto"), HAL_ERROR_RPC_TRANSPORT;
+    return HAL_OK;
+}
+
+hal_error_t rpc_recvfrom(uint8_t * const buf, size_t * const len, void **opaque)
+{
+    static struct sockaddr_in sin;
+    socklen_t sin_len = sizeof(sin);
+    int ret;
+    
+    if ((ret = recvfrom(sock, buf, *len, 0, (struct sockaddr *)&sin, &sin_len)) == -1)
+	return HAL_ERROR_RPC_TRANSPORT;
+    *opaque = (void *)&sin;
+    *len = ret;
+    return HAL_OK;
+}
-- 
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