From 63519d6ae4cb20ae4871310e09a28fd59f5c9fc7 Mon Sep 17 00:00:00 2001
From: Johann Latocha
Date: Tue, 31 Jan 2012 23:52:24 +0100
Subject: [ALL] Some refactoring

---
 src/server/net.c | 133 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 133 insertions(+)
 create mode 100644 src/server/net.c

(limited to 'src/server/net.c')

diff --git a/src/server/net.c b/src/server/net.c
new file mode 100644
index 0000000..87af60f
--- /dev/null
+++ b/src/server/net.c
@@ -0,0 +1,133 @@
+/*
+ * This file is part of the Distributed Network Block Device 3
+ *
+ * Copyright(c) 2011-2012 Johann Latocha <johann@latocha.de>
+ *
+ * This file may be licensed under the terms of of the
+ * GNU General Public License Version 2 (the ``GPL'').
+ *
+ * Software distributed under the License is distributed
+ * on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
+ * express or implied. See the GPL for the specific language
+ * governing rights and limitations.
+ *
+ * You should have received a copy of the GPL along with this
+ * program. If not, go to http://www.gnu.org/licenses/gpl.html
+ * or write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ */
+
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+#include <pthread.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <sys/socket.h>
+#include <sys/sendfile.h>
+#include <sys/types.h>
+#include <netinet/in.h>
+
+#include "server.h"
+#include "hashtable.h"
+
+void *dnbd3_handle_query(void *client_socket)
+{
+    int image_file = -1;
+    off_t filesize = 0;
+    int sock = (int) (uintptr_t) client_socket;
+    dnbd3_request_t request;
+    dnbd3_reply_t reply;
+    uint16_t cmd;
+
+    while (recv(sock, &request, sizeof(dnbd3_request_t), MSG_WAITALL) > 0)
+    {
+        cmd = request.cmd;
+        switch (cmd)
+        {
+        case CMD_PING:
+            reply.cmd = request.cmd;
+            memcpy(reply.handle, request.handle, sizeof(request.handle));
+            send(sock, (char *) &reply, sizeof(dnbd3_reply_t), 0);
+            break;
+
+        case CMD_GET_SIZE:
+            pthread_spin_lock(&_spinlock); // because of reloading config
+            image_file = open(dnbd3_ht_search(request.image_id), O_RDONLY);
+            pthread_spin_unlock(&_spinlock);
+            if (image_file < 0)
+            {
+                printf("ERROR: Client requested an unknown image id.\n");
+                filesize = 0;
+            }
+            else
+            {
+                struct stat st;
+                fstat(image_file, &st);
+                filesize = st.st_size;
+            }
+            reply.cmd = request.cmd;
+            reply.filesize = filesize;
+            send(sock, (char *) &reply, sizeof(dnbd3_reply_t), 0);
+            break;
+
+        case CMD_GET_BLOCK:
+            if (image_file < 0)
+                break;
+
+            reply.cmd = request.cmd;
+            memcpy(reply.handle, request.handle, sizeof(request.handle));
+            send(sock, (char *) &reply, sizeof(dnbd3_reply_t), 0);
+
+            if (sendfile(sock, image_file, (off_t *) &request.offset, request.size) < 0)
+                printf("ERROR: sendfile returned -1\n");
+
+            break;
+
+        default:
+            printf("ERROR: Unknown command\n");
+            break;
+        }
+
+    }
+    close(sock);
+    printf("INFO: Client exit.\n");
+    pthread_exit((void *) 0);
+}
+
+int dnbd3_setup_socket()
+{
+    int sock;
+    struct sockaddr_in server;
+
+    // Create socket
+    sock = socket(PF_INET, SOCK_STREAM, IPPROTO_TCP);
+    if (sock < 0)
+    {
+        printf("ERROR: Socket failure\n");
+        return -1;
+    }
+
+    memset(&server, 0, sizeof(server));
+    server.sin_family = AF_INET; // IPv4
+    server.sin_addr.s_addr = htonl(INADDR_ANY); // Take all IPs
+    server.sin_port = htons(PORT); // set port number
+
+    // Bind to socket
+    if (bind(sock, (struct sockaddr*) &server, sizeof(server)) < 0)
+    {
+        printf("ERROR: Bind failure\n");
+        return -1;
+    }
+
+    // Listen on socket
+    if (listen(sock, 50) == -1)
+    {
+        printf("ERROR: Listen failure\n");
+        return -1;
+    }
+
+    return sock;
+}
-- 
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