source/include/packet.h

   1 /*
   2    Unix SMB/CIFS implementation.
   3    Packet handling
   4    Copyright (C) Volker Lendecke 2007
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 2 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program; if not, write to the Free Software
  18    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  19 */
  20
  21 /*
  22  * A packet context is a wrapper around a bidirectional file descriptor,
  23  * hiding the handling of individual requests.
  24  */
  25
  26 struct packet_context;
  27
  28 /*
  29  * Initialize a packet context. The fd is given to the packet context, meaning
  30  * that it is automatically closed when the packet context is freed.
  31  */
  32 struct packet_context *packet_init(TALLOC_CTX *mem_ctx, int fd);
  33
  34 /*
  35  * Pull data from the fd
  36  */
  37 NTSTATUS packet_fd_read(struct packet_context *ctx);
  38
  39 /*
  40  * Sync read, wait for the next chunk
  41  */
  42 NTSTATUS packet_fd_read_sync(struct packet_context *ctx);
  43
  44 /*
  45  * Handle an incoming packet:
  46  * Return False if none is available
  47  * Otherwise return True and store the callback result in *status
  48  */
  49 BOOL packet_handler(struct packet_context *ctx,
  50                     BOOL (*full_req)(const struct data_blob *data,
  51                                      size_t *length,
  52                                      void *private_data),
  53                     NTSTATUS (*callback)(const struct data_blob *data,
  54                                          void *private_data),
  55                     void *private_data,
  56                     NTSTATUS *status);
  57
  58 /*
  59  * How many bytes of outgoing data do we have pending?
  60  */
  61 size_t packet_outgoing_bytes(struct packet_context *ctx);
  62
  63 /*
  64  * Push data to the fd
  65  */
  66 NTSTATUS packet_fd_write(struct packet_context *ctx);
  67
  68 /*
  69  * Sync flush all outgoing bytes
  70  */
  71 NTSTATUS packet_flush(struct packet_context *ctx);
  72
  73 /*
  74  * Send a list of DATA_BLOBs
  75  *
  76  * Example:  packet_send(ctx, 2, data_blob_const(&size, sizeof(size)),
  77  *                       data_blob_const(buf, size));
  78  */
  79 NTSTATUS packet_send(struct packet_context *ctx, int num_blobs, ...);
  80
  81 /*
  82  * Get the packet context's file descriptor
  83  */
  84 int packet_get_fd(struct packet_context *ctx);