private void start_listening()
{
IPEndPoint localEndPoint = new IPEndPoint(IPAddress.Any, 11111);
Socket newsock = new Socket(AddressFamily.InterNetwork,
SocketType.Stream, ProtocolType.Tcp);
newsock.Bind(localEndPoint);
newsock.Listen(10);
Console.WriteLine("participant started listening..");
while (true)
{
Socket client = newsock.Accept();
byte[] remotehdr = new byte[128];
client.Receive(remotehdr);
RFSCommHeader hobj = new RFSCommHeader();
hobj.bytestream_to_headerobj(remotehdr, 0);
curr_drive_id = hobj.driveid;
long seqn = hobj.seq_num;
Console.WriteLine("recived new connection attempt");
if (hobj.optype == RCS_OP.CONNECT)
{
bool alreadymounted = false;
long drivesize = 0;
bool drivepresent = check_if_driveid_exists(hobj.driveid, ref alreadymounted, ref drivesize);
if (drivepresent == true && alreadymounted == false)
{
byte[] replyhdr = new byte[128];
Prepare_Header2(replyhdr, RCS_OP.CONNECT_ACK_OKAY, 1, drivesize, 0, seqn);
client.Send(replyhdr);
Lun_Item ci = create_new_conn_entry(hobj.driveid, client);
Thread t = new Thread(start_servicing);
t.Start(ci);
Console.WriteLine("sent new connection okay");
}
else
{
byte[] replyhdr = new byte[128];
Prepare_Header2(replyhdr, RCS_OP.CONNECT_ACK_FAIL, 1, 0, 0, seqn);
client.Send(replyhdr);
client.Close();
Console.WriteLine("sent new connection failed");
}
}
}
}
private void Prepare_Header2(byte[] buf, RCS_OP op, int did, long offset, int size, long seqn)
{
for (int i = 0; i < buf.Length; i++)
{
buf[i] = 0;
}
switch (op)
{
case RCS_OP.NO_OP:
case RCS_OP.CONNECT_ACK_FAIL:
case RCS_OP.CONNECT_ACK_OKAY:
case RCS_OP.READ_REPLY:
case RCS_OP.WRITE_ACK:
RFSCommHeader hobj = new RFSCommHeader(op, did, offset, size);
hobj.seq_num = seqn;
hobj.headerobj_to_bytestream(buf, 0);
break;
//assert otherwize
}
}
/*
* Accept requests for any drive ID serially, and reply back to them in the
* tcp port. This runs as a new thread.
*/
private void start_servicing(object parameter1)
{
Lun_Item ci = (Lun_Item)parameter1;
Socket client = ci.client;
byte[] remote_hdr = new byte[128];
byte[] my_hdr = new byte[128];
while (true)
{
RFSCommHeader hobj = new RFSCommHeader();
long seqn = 0;
try
{
client.Receive(remote_hdr);
hobj.bytestream_to_headerobj(remote_hdr, 0);
seqn = hobj.seq_num;
}
catch (Exception e)
{
Console.WriteLine("Encountered error : " + e.Message);
return;
}
switch (hobj.optype)
{
case RCS_OP.NO_OP:
break;
case RCS_OP.DISCONNECT:
Console.WriteLine("Client has disconnected!");
mark_end_connection(hobj.driveid);
client.Close();
return;
case RCS_OP.READ:
Prepare_Header2(my_hdr, RCS_OP.READ_REPLY, hobj.driveid, hobj.driveoffset, hobj.datasize, seqn);
client.Send(my_hdr);
uint sxsize = 0;
byte[] tmpbuf = new byte[hobj.datasize];
string fname = hobj.driveid.ToString();
REDDY.ptrIFSDMux.ReadFile(1, fname, tmpbuf, ref sxsize, hobj.driveoffset, null);
int send_ds = 0;
while (send_ds < hobj.datasize)
{
int sx = client.Send(tmpbuf, send_ds, hobj.datasize - send_ds, SocketFlags.None);
send_ds += sx;
}
break;
case RCS_OP.WRITE:
Prepare_Header2(my_hdr, RCS_OP.WRITE_ACK, hobj.driveid, hobj.driveoffset, hobj.datasize, seqn);
int recv_ds = 0;
byte[] tmpbuf2 = new byte[hobj.datasize];
while (recv_ds < hobj.datasize)
{
int sx = client.Receive(tmpbuf2, recv_ds, hobj.datasize - recv_ds, SocketFlags.None);
recv_ds += sx;
}
uint sxsize2 = 0;
string fname2 = hobj.driveid.ToString();
REDDY.ptrIFSDMux.WriteFile(1, fname2, tmpbuf2, ref sxsize2, hobj.driveoffset, null);
client.Send(my_hdr);
break;
//assert otherwise
}
}
}
