/* 

   Unix SMB/CIFS implementation.

   Copyright (C) Volker Lendecke 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 3 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, see <http://www.gnu.org/licenses/>.

*/

/*

  a composite API for loading a whole file into memory

*/

#include "includes.h"

#include "libcli/composite/composite.h"

#include "libcli/smb_composite/smb_composite.h"

#include "libcli/resolve/resolve.h"

enum fetchfile_stage {FETCHFILE_CONNECT,

          FETCHFILE_READ};

struct fetchfile_state {

  enum fetchfile_stage stage;

  struct smb_composite_fetchfile *io;

  struct composite_context *creq;

  struct smb_composite_connect *connect;

  struct smb_composite_loadfile *loadfile;

};

static void fetchfile_composite_handler(struct composite_context *req);

static NTSTATUS fetchfile_connect(struct composite_context *c,

          struct smb_composite_fetchfile *io)

{

  NTSTATUS status;

  struct fetchfile_state *state;

  state = talloc_get_type(c->private_data, struct fetchfile_state);

  status = smb_composite_connect_recv(state->creq, c);

  NT_STATUS_NOT_OK_RETURN(status);

  state->loadfile = talloc(state, struct smb_composite_loadfile);

  NT_STATUS_HAVE_NO_MEMORY(state->loadfile);

  state->loadfile->in.fname = io->in.filename;

  state->creq = smb_composite_loadfile_send(state->connect->out.tree,

             state->loadfile);

  NT_STATUS_HAVE_NO_MEMORY(state->creq);

  state->creq->async.private_data = c;

  state->creq->async.fn = fetchfile_composite_handler;

  state->stage = FETCHFILE_READ;

  return NT_STATUS_OK;

}

static NTSTATUS fetchfile_read(struct composite_context *c,

             struct smb_composite_fetchfile *io)

{

  NTSTATUS status;

  struct fetchfile_state *state;

  state = talloc_get_type(c->private_data, struct fetchfile_state);

  status = smb_composite_loadfile_recv(state->creq, NULL);

  NT_STATUS_NOT_OK_RETURN(status);

  io->out.data = state->loadfile->out.data;

  io->out.size = state->loadfile->out.size;

  c->state = COMPOSITE_STATE_DONE;

  if (c->async.fn)

    c->async.fn(c);

  return NT_STATUS_OK;

}

static void fetchfile_state_handler(struct composite_context *c)

{

  struct fetchfile_state *state;

  NTSTATUS status;

  state = talloc_get_type(c->private_data, struct fetchfile_state);

  /* when this handler is called, the stage indicates what

     call has just finished */

  switch (state->stage) {

  case FETCHFILE_CONNECT:

    status = fetchfile_connect(c, state->io);

    break;

  case FETCHFILE_READ:

    status = fetchfile_read(c, state->io);

    break;

  default:

    status = NT_STATUS_UNSUCCESSFUL;

    break;

  }

  if (!NT_STATUS_IS_OK(status)) {

    c->status = status;

    c->state = COMPOSITE_STATE_ERROR;

    if (c->async.fn) {

      c->async.fn(c);

    }

  }

}

static void fetchfile_composite_handler(struct composite_context *creq)

{

  struct composite_context *c = talloc_get_type(creq->async.private_data, 

                  struct composite_context);

  fetchfile_state_handler(c);

}

struct composite_context *smb_composite_fetchfile_send(struct smb_composite_fetchfile *io,

                   struct loadparm_context *lp_ctx,

                   struct tevent_context *event_ctx)

{

  struct composite_context *c;

  struct fetchfile_state *state;

  c = talloc_zero(NULL, struct composite_context);

  if (c == NULL) goto failed;

  state = talloc(c, struct fetchfile_state);

  if (state == NULL) goto failed;

  state->connect = talloc_zero(state, struct smb_composite_connect);

  if (state->connect == NULL) goto failed;

  state->io = io;

  state->connect->in.dest_host    = io->in.dest_host;

  state->connect->in.socket_options = io->in.socket_options;

  state->connect->in.called_name  = io->in.called_name;

  state->connect->in.service      = io->in.service;

  state->connect->in.service_type = io->in.service_type;

  state->connect->in.credentials  = io->in.credentials;

  state->connect->in.fallback_to_anonymous = false;

  state->connect->in.workgroup    = io->in.workgroup;

  state->connect->in.gensec_settings = io->in.gensec_settings;

  state->connect->in.options  = io->in.options;

  state->connect->in.session_options = io->in.session_options;

  state->creq = smb_composite_connect_send(state->connect, state, lp_ctx,

             io->in.resolve_ctx, event_ctx);

  if (state->creq == NULL) goto failed;

  state->creq->async.private_data = c;

  state->creq->async.fn = fetchfile_composite_handler;

  c->state = COMPOSITE_STATE_IN_PROGRESS;

  state->stage = FETCHFILE_CONNECT;

  c->private_data = state;

  return c;

 failed:

  talloc_free(c);

  return NULL;

}

NTSTATUS smb_composite_fetchfile_recv(struct composite_context *c,

              TALLOC_CTX *mem_ctx)

{

  NTSTATUS status;

  status = composite_wait(c);

  if (NT_STATUS_IS_OK(status)) {

    struct fetchfile_state *state = talloc_get_type(c->private_data, struct fetchfile_state);

    talloc_steal(mem_ctx, state->io->out.data);

  }

  talloc_free(c);

  return status;

}