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/*
Unix SMB/CIFS implementation.
Manage smbsrv_tcon structures
Copyright (C) Andrew Tridgell 1998
Copyright (C) Alexander Bokovoy 2002
Copyright (C) Stefan Metzmacher 2005-2006
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 "samba/service_stream.h"
#include "lib/tsocket/tsocket.h"
#include "ntvfs/ntvfs.h"
#include "lib/util/idtree_random.h"
/****************************************************************************
init the tcon structures
****************************************************************************/
static NTSTATUS smbsrv_init_tcons(struct smbsrv_tcons_context *tcons_ctx, TALLOC_CTX *mem_ctx, uint32_t limit)
{
/*
* the idr_* functions take 'int' as limit,
* and only work with a max limit 0x00FFFFFF
*/
limit &= 0x00FFFFFF;
tcons_ctx->idtree_tid = idr_init(mem_ctx);
NT_STATUS_HAVE_NO_MEMORY(tcons_ctx->idtree_tid);
tcons_ctx->idtree_limit = limit;
tcons_ctx->list = NULL;
return NT_STATUS_OK;
}
NTSTATUS smbsrv_smb_init_tcons(struct smbsrv_connection *smb_conn)
{
return smbsrv_init_tcons(&smb_conn->smb_tcons, smb_conn, UINT16_MAX);
}
NTSTATUS smbsrv_smb2_init_tcons(struct smbsrv_session *smb_sess)
{
return smbsrv_init_tcons(&smb_sess->smb2_tcons, smb_sess, UINT32_MAX);
}
/****************************************************************************
find a tcon given a tid for SMB
****************************************************************************/
static struct smbsrv_tcon *smbsrv_tcon_find(struct smbsrv_tcons_context *tcons_ctx,
uint32_t tid, struct timeval request_time)
{
void *p;
struct smbsrv_tcon *tcon;
if (tid == 0) return NULL;
if (tid > tcons_ctx->idtree_limit) return NULL;
p = idr_find(tcons_ctx->idtree_tid, tid);
if (!p) return NULL;
tcon = talloc_get_type(p, struct smbsrv_tcon);
if (!tcon) return NULL;
tcon->statistics.last_request_time = request_time;
return tcon;
}
struct smbsrv_tcon *smbsrv_smb_tcon_find(struct smbsrv_connection *smb_conn,
uint32_t tid, struct timeval request_time)
{
return smbsrv_tcon_find(&smb_conn->smb_tcons, tid, request_time);
}
struct smbsrv_tcon *smbsrv_smb2_tcon_find(struct smbsrv_session *smb_sess,
uint32_t tid, struct timeval request_time)
{
if (!smb_sess) return NULL;
return smbsrv_tcon_find(&smb_sess->smb2_tcons, tid, request_time);
}
/*
destroy a connection structure
*/
static int smbsrv_tcon_destructor(struct smbsrv_tcon *tcon)
{
struct smbsrv_tcons_context *tcons_ctx;
struct tsocket_address *client_addr;
client_addr = tcon->smb_conn->connection->remote_address;
DEBUG(3,("%s closed connection to service %s\n",
tsocket_address_string(client_addr, tcon),
tcon->share_name));
/* tell the ntvfs backend that we are disconnecting */
if (tcon->ntvfs) {
ntvfs_disconnect(tcon->ntvfs);
tcon->ntvfs = NULL;
}
if (tcon->smb2.session) {
tcons_ctx = &tcon->smb2.session->smb2_tcons;
} else {
tcons_ctx = &tcon->smb_conn->smb_tcons;
}
idr_remove(tcons_ctx->idtree_tid, tcon->tid);
DLIST_REMOVE(tcons_ctx->list, tcon);
return 0;
}
/*
find first available connection slot
*/
static struct smbsrv_tcon *smbsrv_tcon_new(struct smbsrv_connection *smb_conn,
struct smbsrv_session *smb_sess,
const char *share_name)
{
TALLOC_CTX *mem_ctx;
struct smbsrv_tcons_context *tcons_ctx;
uint32_t handle_uint_max;
struct smbsrv_tcon *tcon;
NTSTATUS status;
int i;
if (smb_sess) {
mem_ctx = smb_sess;
tcons_ctx = &smb_sess->smb2_tcons;
handle_uint_max = UINT32_MAX;
} else {
mem_ctx = smb_conn;
tcons_ctx = &smb_conn->smb_tcons;
handle_uint_max = UINT16_MAX;
}
tcon = talloc_zero(mem_ctx, struct smbsrv_tcon);
if (!tcon) return NULL;
tcon->smb_conn = smb_conn;
tcon->smb2.session = smb_sess;
tcon->share_name = talloc_strdup(tcon, share_name);
if (!tcon->share_name) goto failed;
/*
* the use -1 here, because we don't want to give away the wildcard
* fnum used in SMBflush
*/
status = smbsrv_init_handles(tcon, handle_uint_max - 1);
if (!NT_STATUS_IS_OK(status)) {
DEBUG(1,("ERROR! failed to init handles: %s\n", nt_errstr(status)));
goto failed;
}
i = idr_get_new_random(
tcons_ctx->idtree_tid, tcon, 1, tcons_ctx->idtree_limit);
if (i == -1) {
DEBUG(1,("ERROR! Out of connection structures\n"));
goto failed;
}
tcon->tid = i;
DLIST_ADD(tcons_ctx->list, tcon);
talloc_set_destructor(tcon, smbsrv_tcon_destructor);
/* now fill in some statistics */
tcon->statistics.connect_time = timeval_current();
return tcon;
failed:
talloc_free(tcon);
return NULL;
}
struct smbsrv_tcon *smbsrv_smb_tcon_new(struct smbsrv_connection *smb_conn, const char *share_name)
{
return smbsrv_tcon_new(smb_conn, NULL, share_name);
}
struct smbsrv_tcon *smbsrv_smb2_tcon_new(struct smbsrv_session *smb_sess, const char *share_name)
{
return smbsrv_tcon_new(smb_sess->smb_conn, smb_sess, share_name);
}
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