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https://github.com/samba-team/samba.git
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54abb0724b
metze
195 lines
5.4 KiB
C
195 lines
5.4 KiB
C
/*
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Unix SMB/CIFS implementation.
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Manage smbsrv_tcon structures
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Copyright (C) Andrew Tridgell 1998
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Copyright (C) Alexander Bokovoy 2002
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Copyright (C) Stefan Metzmacher 2005-2006
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "smb_server/smb_server.h"
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#include "smbd/service_stream.h"
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#include "lib/tsocket/tsocket.h"
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#include "ntvfs/ntvfs.h"
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/****************************************************************************
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init the tcon structures
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****************************************************************************/
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static NTSTATUS smbsrv_init_tcons(struct smbsrv_tcons_context *tcons_ctx, TALLOC_CTX *mem_ctx, uint32_t limit)
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{
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/*
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* the idr_* functions take 'int' as limit,
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* and only work with a max limit 0x00FFFFFF
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*/
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limit &= 0x00FFFFFF;
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tcons_ctx->idtree_tid = idr_init(mem_ctx);
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NT_STATUS_HAVE_NO_MEMORY(tcons_ctx->idtree_tid);
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tcons_ctx->idtree_limit = limit;
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tcons_ctx->list = NULL;
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return NT_STATUS_OK;
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}
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NTSTATUS smbsrv_smb_init_tcons(struct smbsrv_connection *smb_conn)
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{
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return smbsrv_init_tcons(&smb_conn->smb_tcons, smb_conn, UINT16_MAX);
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}
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NTSTATUS smbsrv_smb2_init_tcons(struct smbsrv_session *smb_sess)
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{
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return smbsrv_init_tcons(&smb_sess->smb2_tcons, smb_sess, UINT32_MAX);
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}
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/****************************************************************************
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find a tcon given a tid for SMB
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****************************************************************************/
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static struct smbsrv_tcon *smbsrv_tcon_find(struct smbsrv_tcons_context *tcons_ctx,
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uint32_t tid, struct timeval request_time)
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{
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void *p;
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struct smbsrv_tcon *tcon;
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if (tid == 0) return NULL;
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if (tid > tcons_ctx->idtree_limit) return NULL;
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p = idr_find(tcons_ctx->idtree_tid, tid);
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if (!p) return NULL;
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tcon = talloc_get_type(p, struct smbsrv_tcon);
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if (!tcon) return NULL;
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tcon->statistics.last_request_time = request_time;
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return tcon;
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}
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struct smbsrv_tcon *smbsrv_smb_tcon_find(struct smbsrv_connection *smb_conn,
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uint32_t tid, struct timeval request_time)
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{
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return smbsrv_tcon_find(&smb_conn->smb_tcons, tid, request_time);
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}
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struct smbsrv_tcon *smbsrv_smb2_tcon_find(struct smbsrv_session *smb_sess,
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uint32_t tid, struct timeval request_time)
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{
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if (!smb_sess) return NULL;
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return smbsrv_tcon_find(&smb_sess->smb2_tcons, tid, request_time);
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}
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/*
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destroy a connection structure
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*/
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static int smbsrv_tcon_destructor(struct smbsrv_tcon *tcon)
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{
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struct smbsrv_tcons_context *tcons_ctx;
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struct tsocket_address *client_addr;
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client_addr = tcon->smb_conn->connection->remote_address;
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DEBUG(3,("%s closed connection to service %s\n",
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tsocket_address_string(client_addr, tcon),
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tcon->share_name));
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/* tell the ntvfs backend that we are disconnecting */
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if (tcon->ntvfs) {
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ntvfs_disconnect(tcon->ntvfs);
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tcon->ntvfs = NULL;
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}
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if (tcon->smb2.session) {
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tcons_ctx = &tcon->smb2.session->smb2_tcons;
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} else {
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tcons_ctx = &tcon->smb_conn->smb_tcons;
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}
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idr_remove(tcons_ctx->idtree_tid, tcon->tid);
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DLIST_REMOVE(tcons_ctx->list, tcon);
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return 0;
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}
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/*
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find first available connection slot
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*/
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static struct smbsrv_tcon *smbsrv_tcon_new(struct smbsrv_connection *smb_conn,
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struct smbsrv_session *smb_sess,
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const char *share_name)
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{
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TALLOC_CTX *mem_ctx;
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struct smbsrv_tcons_context *tcons_ctx;
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uint32_t handle_uint_max;
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struct smbsrv_tcon *tcon;
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NTSTATUS status;
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int i;
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if (smb_sess) {
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mem_ctx = smb_sess;
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tcons_ctx = &smb_sess->smb2_tcons;
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handle_uint_max = UINT32_MAX;
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} else {
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mem_ctx = smb_conn;
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tcons_ctx = &smb_conn->smb_tcons;
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handle_uint_max = UINT16_MAX;
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}
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tcon = talloc_zero(mem_ctx, struct smbsrv_tcon);
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if (!tcon) return NULL;
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tcon->smb_conn = smb_conn;
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tcon->smb2.session = smb_sess;
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tcon->share_name = talloc_strdup(tcon, share_name);
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if (!tcon->share_name) goto failed;
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/*
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* the use -1 here, because we don't want to give away the wildcard
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* fnum used in SMBflush
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*/
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status = smbsrv_init_handles(tcon, handle_uint_max - 1);
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if (!NT_STATUS_IS_OK(status)) {
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DEBUG(1,("ERROR! failed to init handles: %s\n", nt_errstr(status)));
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goto failed;
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}
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i = idr_get_new_random(tcons_ctx->idtree_tid, tcon, tcons_ctx->idtree_limit);
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if (i == -1) {
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DEBUG(1,("ERROR! Out of connection structures\n"));
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goto failed;
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}
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tcon->tid = i;
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DLIST_ADD(tcons_ctx->list, tcon);
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talloc_set_destructor(tcon, smbsrv_tcon_destructor);
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/* now fill in some statistics */
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tcon->statistics.connect_time = timeval_current();
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return tcon;
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failed:
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talloc_free(tcon);
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return NULL;
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}
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struct smbsrv_tcon *smbsrv_smb_tcon_new(struct smbsrv_connection *smb_conn, const char *share_name)
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{
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return smbsrv_tcon_new(smb_conn, NULL, share_name);
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}
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struct smbsrv_tcon *smbsrv_smb2_tcon_new(struct smbsrv_session *smb_sess, const char *share_name)
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{
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return smbsrv_tcon_new(smb_sess->smb_conn, smb_sess, share_name);
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}
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