static
err_t
InternalRecvEventHandler(void *arg, PTCP_PCB pcb, struct pbuf *p, const err_t err)
{
PCONNECTION_ENDPOINT Connection = arg;
/* Make sure the socket didn't get closed */
if (!arg)
{
if (p)
pbuf_free(p);
return ERR_OK;
}
if (p)
{
LibTCPEnqueuePacket(Connection, p);
tcp_recved(pcb, p->tot_len);
TCPRecvEventHandler(arg);
}
else if (err == ERR_OK)
{
/* Complete pending reads with 0 bytes to indicate a graceful closure,
* but note that send is still possible in this state so we don't close the
* whole socket here (by calling tcp_close()) as that would violate TCP specs
*/
Connection->ReceiveShutdown = TRUE;
Connection->ReceiveShutdownStatus = STATUS_SUCCESS;
/* If we already did a send shutdown, we're in TIME_WAIT so we can't use this PCB anymore */
if (Connection->SendShutdown)
{
Connection->SocketContext = NULL;
tcp_arg(pcb, NULL);
}
/* Indicate the graceful close event */
TCPRecvEventHandler(arg);
/* If the PCB is gone, clean up the connection */
if (Connection->SendShutdown)
{
TCPFinEventHandler(Connection, ERR_CLSD);
}
}
return ERR_OK;
}
static
err_t
InternalRecvEventHandler(void *arg, PTCP_PCB pcb, struct pbuf *p, const err_t err)
{
PCONNECTION_ENDPOINT Connection = arg;
/* Make sure the socket didn't get closed */
if (!arg)
{
if (p)
pbuf_free(p);
return ERR_OK;
}
if (p)
{
LibTCPEnqueuePacket(Connection, p);
tcp_recved(pcb, p->tot_len);
TCPRecvEventHandler(arg);
}
else if (err == ERR_OK)
{
/* Complete pending reads with 0 bytes to indicate a graceful closure,
* but note that send is still possible in this state so we don't close the
* whole socket here (by calling tcp_close()) as that would violate TCP specs
*/
Connection->ReceiveShutdown = TRUE;
Connection->ReceiveShutdownStatus = STATUS_SUCCESS;
/* This code path executes for both remotely and locally initiated closures,
* and we need to distinguish between them */
if (Connection->SocketContext)
{
/* Remotely initiated close */
TCPRecvEventHandler(arg);
}
else
{
/* Locally initated close */
TCPFinEventHandler(arg, ERR_CLSD);
}
}
return ERR_OK;
}
static
void
InternalErrorEventHandler(void *arg, const err_t err)
{
PCONNECTION_ENDPOINT Connection = arg;
KIRQL OldIrql;
/* Make sure the socket didn't get closed */
if (!arg) return;
/* Check if data is left to be read */
LockObject(Connection, &OldIrql);
if (IsListEmpty(&Connection->PacketQueue))
{
UnlockObject(Connection, OldIrql);
/* Deliver the error now */
TCPFinEventHandler(arg, err);
}
else
{
UnlockObject(Connection, OldIrql);
/* Defer the error delivery until all data is gone */
Connection->ReceiveShutdown = TRUE;
Connection->ReceiveShutdownStatus = TCPTranslateError(err);
TCPRecvEventHandler(arg);
}
}
static
void
InternalErrorEventHandler(void *arg, const err_t err)
{
PCONNECTION_ENDPOINT Connection = arg;
/* Make sure the socket didn't get closed */
if (!arg || Connection->SocketContext == NULL) return;
/* The PCB is dead now */
Connection->SocketContext = NULL;
/* Give them one shot to receive the remaining data */
Connection->ReceiveShutdown = TRUE;
Connection->ReceiveShutdownStatus = TCPTranslateError(err);
TCPRecvEventHandler(Connection);
/* Terminate the connection */
TCPFinEventHandler(Connection, err);
}
