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/*
* 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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