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samba-mirror/source4/libcli/smb_composite/loadfile.c
Jelmer Vernooij d4de4c2d21 r12608: Remove some unused #include lines.
(This used to be commit 70e7449318)
2007-10-10 13:49:03 -05:00

294 lines
8.3 KiB
C

/*
Unix SMB/CIFS implementation.
Copyright (C) Andrew Tridgell 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.
*/
/*
a composite API for loading a whole file into memory
*/
#include "includes.h"
#include "libcli/raw/libcliraw.h"
#include "libcli/composite/composite.h"
#include "libcli/smb_composite/smb_composite.h"
/* the stages of this call */
enum loadfile_stage {LOADFILE_OPEN, LOADFILE_READ, LOADFILE_CLOSE};
static void loadfile_handler(struct smbcli_request *req);
struct loadfile_state {
enum loadfile_stage stage;
struct smb_composite_loadfile *io;
struct smbcli_request *req;
union smb_open *io_open;
union smb_read *io_read;
};
/*
setup for the close
*/
static NTSTATUS setup_close(struct composite_context *c,
struct smbcli_tree *tree, uint16_t fnum)
{
struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
union smb_close *io_close;
/* nothing to read, setup the close */
io_close = talloc(c, union smb_close);
NT_STATUS_HAVE_NO_MEMORY(io_close);
io_close->close.level = RAW_CLOSE_CLOSE;
io_close->close.in.fnum = fnum;
io_close->close.in.write_time = 0;
state->req = smb_raw_close_send(tree, io_close);
NT_STATUS_HAVE_NO_MEMORY(state->req);
/* call the handler again when the close is done */
state->req->async.fn = loadfile_handler;
state->req->async.private = c;
state->stage = LOADFILE_CLOSE;
return NT_STATUS_OK;
}
/*
called when the open is done - pull the results and setup for the
first readx, or close if the file is zero size
*/
static NTSTATUS loadfile_open(struct composite_context *c,
struct smb_composite_loadfile *io)
{
struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
struct smbcli_tree *tree = state->req->tree;
NTSTATUS status;
status = smb_raw_open_recv(state->req, c, state->io_open);
NT_STATUS_NOT_OK_RETURN(status);
/* don't allow stupidly large loads */
if (state->io_open->ntcreatex.out.size > 100*1000*1000) {
return NT_STATUS_INSUFFICIENT_RESOURCES;
}
/* allocate space for the file data */
io->out.size = state->io_open->ntcreatex.out.size;
io->out.data = talloc_array(c, uint8_t, io->out.size);
NT_STATUS_HAVE_NO_MEMORY(io->out.data);
if (io->out.size == 0) {
return setup_close(c, tree, state->io_open->ntcreatex.out.fnum);
}
/* setup for the read */
state->io_read = talloc(c, union smb_read);
NT_STATUS_HAVE_NO_MEMORY(state->io_read);
state->io_read->readx.level = RAW_READ_READX;
state->io_read->readx.in.fnum = state->io_open->ntcreatex.out.fnum;
state->io_read->readx.in.offset = 0;
state->io_read->readx.in.mincnt = MIN(32768, io->out.size);
state->io_read->readx.in.maxcnt = state->io_read->readx.in.mincnt;
state->io_read->readx.in.remaining = 0;
state->io_read->readx.out.data = io->out.data;
state->req = smb_raw_read_send(tree, state->io_read);
NT_STATUS_HAVE_NO_MEMORY(state->req);
/* call the handler again when the first read is done */
state->req->async.fn = loadfile_handler;
state->req->async.private = c;
state->stage = LOADFILE_READ;
talloc_free(state->io_open);
return NT_STATUS_OK;
}
/*
called when a read is done - pull the results and setup for the
next read, or close if the file is all done
*/
static NTSTATUS loadfile_read(struct composite_context *c,
struct smb_composite_loadfile *io)
{
struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
struct smbcli_tree *tree = state->req->tree;
NTSTATUS status;
status = smb_raw_read_recv(state->req, state->io_read);
NT_STATUS_NOT_OK_RETURN(status);
/* we might be done */
if (state->io_read->readx.in.offset +
state->io_read->readx.out.nread == io->out.size) {
return setup_close(c, tree, state->io_read->readx.in.fnum);
}
/* setup for the next read */
state->io_read->readx.in.offset += state->io_read->readx.out.nread;
state->io_read->readx.in.mincnt = MIN(32768, io->out.size - state->io_read->readx.in.offset);
state->io_read->readx.out.data = io->out.data + state->io_read->readx.in.offset;
state->req = smb_raw_read_send(tree, state->io_read);
NT_STATUS_HAVE_NO_MEMORY(state->req);
/* call the handler again when the read is done */
state->req->async.fn = loadfile_handler;
state->req->async.private = c;
return NT_STATUS_OK;
}
/*
called when the close is done, check the status and cleanup
*/
static NTSTATUS loadfile_close(struct composite_context *c,
struct smb_composite_loadfile *io)
{
struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
NTSTATUS status;
status = smbcli_request_simple_recv(state->req);
NT_STATUS_NOT_OK_RETURN(status);
c->state = COMPOSITE_STATE_DONE;
return NT_STATUS_OK;
}
/*
handler for completion of a sub-request in loadfile
*/
static void loadfile_handler(struct smbcli_request *req)
{
struct composite_context *c = req->async.private;
struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
/* when this handler is called, the stage indicates what
call has just finished */
switch (state->stage) {
case LOADFILE_OPEN:
c->status = loadfile_open(c, state->io);
break;
case LOADFILE_READ:
c->status = loadfile_read(c, state->io);
break;
case LOADFILE_CLOSE:
c->status = loadfile_close(c, state->io);
break;
}
if (!NT_STATUS_IS_OK(c->status)) {
c->state = COMPOSITE_STATE_ERROR;
}
if (c->state >= COMPOSITE_STATE_DONE &&
c->async.fn) {
c->async.fn(c);
}
}
/*
composite loadfile call - does an openx followed by a number of readx calls,
followed by a close
*/
struct composite_context *smb_composite_loadfile_send(struct smbcli_tree *tree,
struct smb_composite_loadfile *io)
{
struct composite_context *c;
struct loadfile_state *state;
c = talloc_zero(tree, struct composite_context);
if (c == NULL) goto failed;
state = talloc(c, struct loadfile_state);
if (state == NULL) goto failed;
state->io = io;
c->private_data = state;
c->state = COMPOSITE_STATE_IN_PROGRESS;
c->event_ctx = tree->session->transport->socket->event.ctx;
/* setup for the open */
state->io_open = talloc_zero(c, union smb_open);
if (state->io_open == NULL) goto failed;
state->io_open->ntcreatex.level = RAW_OPEN_NTCREATEX;
state->io_open->ntcreatex.in.flags = NTCREATEX_FLAGS_EXTENDED;
state->io_open->ntcreatex.in.access_mask = SEC_FILE_READ_DATA;
state->io_open->ntcreatex.in.file_attr = FILE_ATTRIBUTE_NORMAL;
state->io_open->ntcreatex.in.share_access = NTCREATEX_SHARE_ACCESS_READ | NTCREATEX_SHARE_ACCESS_WRITE;
state->io_open->ntcreatex.in.open_disposition = NTCREATEX_DISP_OPEN;
state->io_open->ntcreatex.in.impersonation = NTCREATEX_IMPERSONATION_ANONYMOUS;
state->io_open->ntcreatex.in.fname = io->in.fname;
/* send the open on its way */
state->req = smb_raw_open_send(tree, state->io_open);
if (state->req == NULL) goto failed;
/* setup the callback handler */
state->req->async.fn = loadfile_handler;
state->req->async.private = c;
state->stage = LOADFILE_OPEN;
return c;
failed:
talloc_free(c);
return NULL;
}
/*
composite loadfile call - recv side
*/
NTSTATUS smb_composite_loadfile_recv(struct composite_context *c, TALLOC_CTX *mem_ctx)
{
NTSTATUS status;
status = composite_wait(c);
if (NT_STATUS_IS_OK(status)) {
struct loadfile_state *state = talloc_get_type(c->private_data, struct loadfile_state);
talloc_steal(mem_ctx, state->io->out.data);
}
talloc_free(c);
return status;
}
/*
composite loadfile call - sync interface
*/
NTSTATUS smb_composite_loadfile(struct smbcli_tree *tree,
TALLOC_CTX *mem_ctx,
struct smb_composite_loadfile *io)
{
struct composite_context *c = smb_composite_loadfile_send(tree, io);
return smb_composite_loadfile_recv(c, mem_ctx);
}