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/*
Unix SMB/CIFS implementation.
Manage smbsrv_handle structures
Copyright (C) Stefan Metzmacher 2006
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/>.
*/
#include "includes.h"
#include "smb_server/smb_server.h"
#include "lib/util/idtree.h"
/****************************************************************************
init the handle structures
****************************************************************************/
NTSTATUS smbsrv_init_handles(struct smbsrv_tcon *tcon, uint32_t limit)
{
/*
* the idr_* functions take 'int' as limit,
* and only work with a max limit 0x00FFFFFF
*/
limit &= 0x00FFFFFF;
tcon->handles.idtree_hid = idr_init(tcon);
NT_STATUS_HAVE_NO_MEMORY(tcon->handles.idtree_hid);
tcon->handles.idtree_limit = limit;
tcon->handles.list = NULL;
return NT_STATUS_OK;
}
/****************************************************************************
find a handle given a handle id
****************************************************************************/
static struct smbsrv_handle *smbsrv_handle_find(struct smbsrv_handles_context *handles_ctx,
uint32_t hid, struct timeval request_time)
{
void *p;
struct smbsrv_handle *handle;
if (hid == 0) return NULL;
if (hid > handles_ctx->idtree_limit) return NULL;
p = idr_find(handles_ctx->idtree_hid, hid);
if (!p) return NULL;
handle = talloc_get_type(p, struct smbsrv_handle);
if (!handle) return NULL;
/* only give it away when the ntvfs subsystem has made the handle valid */
if (!handle->ntvfs) return NULL;
handle->statistics.last_use_time = request_time;
return handle;
}
struct smbsrv_handle *smbsrv_smb_handle_find(struct smbsrv_tcon *smb_tcon,
uint16_t fnum, struct timeval request_time)
{
return smbsrv_handle_find(&smb_tcon->handles, fnum, request_time);
}
struct smbsrv_handle *smbsrv_smb2_handle_find(struct smbsrv_tcon *smb_tcon,
uint32_t hid, struct timeval request_time)
{
return smbsrv_handle_find(&smb_tcon->handles, hid, request_time);
}
/*
destroy a connection structure
*/
static int smbsrv_handle_destructor(struct smbsrv_handle *handle)
{
struct smbsrv_handles_context *handles_ctx;
handles_ctx = &handle->tcon->handles;
idr_remove(handles_ctx->idtree_hid, handle->hid);
DLIST_REMOVE(handles_ctx->list, handle);
DLIST_REMOVE(handle->session->handles, &handle->session_item);
/* tell the ntvfs backend that we are disconnecting */
if (handle->ntvfs) {
talloc_free(handle->ntvfs);
handle->ntvfs = NULL;
}
return 0;
}
/*
find first available handle slot
*/
struct smbsrv_handle *smbsrv_handle_new(struct smbsrv_session *session,
struct smbsrv_tcon *tcon,
TALLOC_CTX *mem_ctx,
struct timeval request_time)
{
struct smbsrv_handles_context *handles_ctx = &tcon->handles;
struct smbsrv_handle *handle;
int i;
handle = talloc_zero(mem_ctx, struct smbsrv_handle);
if (!handle) return NULL;
handle->tcon = tcon;
handle->session = session;
i = idr_get_new_above(handles_ctx->idtree_hid, handle, 1, handles_ctx->idtree_limit);
if (i == -1) {
DEBUG(1,("ERROR! Out of handle structures\n"));
goto failed;
}
handle->hid = i;
handle->session_item.handle = handle;
DLIST_ADD(handles_ctx->list, handle);
DLIST_ADD(session->handles, &handle->session_item);
talloc_set_destructor(handle, smbsrv_handle_destructor);
/* now fill in some statistics */
handle->statistics.open_time = request_time;
handle->statistics.last_use_time = request_time;
return handle;
failed:
talloc_free(handle);
return NULL;
}
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