text: /* 
     Unix SMB2 implementation.
     
     Copyright (C) Stefan Metzmacher            2005
     
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; either version 2 of the License, or
     (at your option) any later version.
     
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
     
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software
     Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  */
  
  /* the context for a single SMB2 request. This is passed to any request-context 
     functions */
  struct smb2srv_request {
  	/* the smbsrv_connection needs a list of requests queued for send */
  	struct smb2srv_request *next, *prev;
  
  	/* the server_context contains all context specific to this SMB socket */
  	struct smbsrv_connection *smb_conn;
  
  	/* conn is only set for operations that have a valid TID */
  	struct smbsrv_tcon *tcon;
  
  	/* the session context is derived from the vuid */
  	struct smbsrv_session *session;
  
  #define SMB2SRV_REQ_CTRL_FLAG_NOT_REPLY (1<<0)
  	uint32_t control_flags;
  
  	/* the system time when the request arrived */
  	struct timeval request_time;
  
  	/* a pointer to the per request union smb_* io structure */
  	void *io_ptr;
  
  	/* the ntvfs_request */
  	struct ntvfs_request *ntvfs;
  
  	/* Now the SMB2 specific stuff */
  
  	/* the status the backend returned */
  	NTSTATUS status;
  
  	/* for matching request and reply */
  	uint64_t seqnum;
  
  	/* the id that can be used to cancel the request */
  	uint32_t pending_id;
  
  	struct smb2_request_buffer in;
  	struct smb2_request_buffer out;
  };
  
  struct smbsrv_request;
  
  #include "smb_server/smb2/smb2_proto.h"
  
  /* useful way of catching wct errors with file and line number */
  #define SMB2SRV_CHECK_BODY_SIZE(req, size, dynamic) do { \
  	size_t is_size = req->in.body_size; \
  	uint16_t field_size = SVAL(req->in.body, 0); \
  	uint16_t want_size = ((dynamic)?(size)+1:(size)); \
  	if (is_size < (size)) { \
  		DEBUG(0,("%s: buffer too small 0x%x. Expected 0x%x\n", \
  			 __location__, (unsigned)is_size, (unsigned)want_size)); \
  		smb2srv_send_error(req,  NT_STATUS_FOOBAR); \
  		return; \
  	}\
  	if (field_size != want_size) { \
  		DEBUG(0,("%s: unexpected fixed body size 0x%x. Expected 0x%x\n", \
  			 __location__, (unsigned)field_size, (unsigned)want_size)); \
  		smb2srv_send_error(req,  NT_STATUS_FOOBAR); \
  		return; \
  	} \
  } while (0)
  
  #define SMB2SRV_CHECK(cmd) do {\
  	NTSTATUS _status; \
  	_status = cmd; \
  	if (!NT_STATUS_IS_OK(_status)) { \
  		smb2srv_send_error(req,  _status); \
  		return; \
  	} \
  } while (0)
  
  /* useful wrapper for talloc with NO_MEMORY reply */
  #define SMB2SRV_TALLOC_IO_PTR(ptr, type) do { \
  	ptr = talloc(req, type); \
  	if (!ptr) { \
  		smb2srv_send_error(req, NT_STATUS_NO_MEMORY); \
  		return; \
  	} \
  	req->io_ptr = ptr; \
  } while (0)
  
  #define SMB2SRV_SETUP_NTVFS_REQUEST(send_fn, state) do { \
  	req->ntvfs = ntvfs_request_create(req->tcon->ntvfs, req, \
  					  req->session->session_info,\
  					  0, \
  					  req->request_time, \
  					  req, send_fn, state); \
  	if (!req->ntvfs) { \
  		smb2srv_send_error(req, NT_STATUS_NO_MEMORY); \
  		return; \
  	} \
  	(void)talloc_steal(req->tcon->ntvfs, req); \
  	req->ntvfs->frontend_data.private_data = req; \
  } while (0)
  
  #define SMB2SRV_CHECK_FILE_HANDLE(handle) do { \
  	if (!handle) { \
  		smb2srv_send_error(req, NT_STATUS_FILE_CLOSED); \
  		return; \
  	} \
  } while (0)
  
  /* 
     check if the backend wants to handle the request asynchronously.
     if it wants it handled synchronously then call the send function
     immediately
  */
  #define SMB2SRV_CALL_NTVFS_BACKEND(cmd) do { \
  	req->ntvfs->async_states->status = cmd; \
  	if (req->ntvfs->async_states->state & NTVFS_ASYNC_STATE_ASYNC) { \
  		NTSTATUS _status; \
  		_status = smb2srv_queue_pending(req); \
  		if (!NT_STATUS_IS_OK(_status)) { \
  			ntvfs_cancel(req->ntvfs); \
  		} \
  	} else { \
  		req->ntvfs->async_states->send_fn(req->ntvfs); \
  	} \
  } while (0)
  
  /* check req->ntvfs->async_states->status and if not OK then send an error reply */
  #define SMB2SRV_CHECK_ASYNC_STATUS_ERR_SIMPLE do { \
  	req = talloc_get_type(ntvfs->async_states->private_data, struct smb2srv_request); \
  	req->status = ntvfs->async_states->status; \
  	if (NT_STATUS_IS_ERR(ntvfs->async_states->status)) { \
  		smb2srv_send_error(req, ntvfs->async_states->status); \
  		return; \
  	} \
  } while (0)
  #define SMB2SRV_CHECK_ASYNC_STATUS_ERR(ptr, type) do { \
  	SMB2SRV_CHECK_ASYNC_STATUS_ERR_SIMPLE; \
  	ptr = talloc_get_type(req->io_ptr, type); \
  } while (0)
  #define SMB2SRV_CHECK_ASYNC_STATUS_SIMPLE do { \
  	req = talloc_get_type(ntvfs->async_states->private_data, struct smb2srv_request); \
  	req->status = ntvfs->async_states->status; \
  	if (!NT_STATUS_IS_OK(ntvfs->async_states->status)) { \
  		smb2srv_send_error(req, ntvfs->async_states->status); \
  		return; \
  	} \
  } while (0)
  #define SMB2SRV_CHECK_ASYNC_STATUS(ptr, type) do { \
  	SMB2SRV_CHECK_ASYNC_STATUS_SIMPLE; \
  	ptr = talloc_get_type(req->io_ptr, type); \
  } while (0)
  