text: /* 
     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 = NT_STATUS_UNSUCCESSFUL;
  	
  	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;
  	}
  
  	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 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(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.dest_ports   = io->in.ports;
  	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, 
  						 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;
  }
  
  NTSTATUS smb_composite_fetchfile(struct smb_composite_fetchfile *io,
  				 TALLOC_CTX *mem_ctx)
  {
  	struct composite_context *c = smb_composite_fetchfile_send(io, NULL);
  	return smb_composite_fetchfile_recv(c, mem_ctx);
  }
  