2 Unix SMB/CIFS implementation.
3 Manage connections_struct structures
4 Copyright (C) Andrew Tridgell 1998
5 Copyright (C) Alexander Bokovoy 2002
6 Copyright (C) Jeremy Allison 2010
8 This program is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 3 of the License, or
11 (at your option) any later version.
13 This program is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 #include "smbd/smbd.h"
24 #include "smbd/globals.h"
25 #include "lib/util/bitmap.h"
27 /****************************************************************************
28 Return the number of open connections.
29 ****************************************************************************/
31 int conn_num_open(struct smbd_server_connection *sconn)
33 return sconn->num_connections;
36 /****************************************************************************
37 Check if a snum is in use.
38 ****************************************************************************/
40 bool conn_snum_used(struct smbd_server_connection *sconn,
43 struct connection_struct *conn;
45 for (conn=sconn->connections; conn; conn=conn->next) {
46 if (conn->params->service == snum) {
54 /****************************************************************************
55 Find first available connection slot, starting from a random position.
56 The randomisation stops problems with the server dieing and clients
57 thinking the server is still available.
58 ****************************************************************************/
60 connection_struct *conn_new(struct smbd_server_connection *sconn)
62 connection_struct *conn;
64 if (!(conn=talloc_zero(NULL, connection_struct)) ||
65 !(conn->params = talloc(conn, struct share_params)) ||
66 !(conn->vuid_cache = talloc_zero(conn, struct vuid_cache)) ||
67 !(conn->connectpath = talloc_strdup(conn, "")) ||
68 !(conn->origpath = talloc_strdup(conn, ""))) {
69 DEBUG(0,("TALLOC_ZERO() failed!\n"));
74 conn->force_group_gid = (gid_t)-1;
76 DLIST_ADD(sconn->connections, conn);
77 sconn->num_connections++;
82 /****************************************************************************
83 Clear a vuid out of the connection's vuid cache
84 ****************************************************************************/
86 static void conn_clear_vuid_cache(connection_struct *conn, uint64_t vuid)
90 for (i=0; i<VUID_CACHE_SIZE; i++) {
91 struct vuid_cache_entry *ent;
93 ent = &conn->vuid_cache->array[i];
95 if (ent->vuid == vuid) {
96 ent->vuid = UID_FIELD_INVALID;
98 if (conn->user_ev_ctx == ent->user_ev_ctx) {
99 conn->user_ev_ctx = NULL;
101 TALLOC_FREE(ent->user_ev_ctx);
104 * We need to keep conn->session_info around
105 * if it's equal to ent->session_info as a SMBulogoff
106 * is often followed by a SMBtdis (with an invalid
107 * vuid). The debug code (or regular code in
108 * vfs_full_audit) wants to refer to the
109 * conn->session_info pointer to print debug
110 * statements. Theoretically this is a bug,
111 * as once the vuid is gone the session_info
112 * on the conn struct isn't valid any more,
113 * but there's enough code that assumes
114 * conn->session_info is never null that
115 * it's easier to hold onto the old pointer
116 * until we get a new sessionsetupX.
117 * As everything is hung off the
118 * conn pointer as a talloc context we're not
119 * leaking memory here. See bug #6315. JRA.
121 if (conn->session_info == ent->session_info) {
122 ent->session_info = NULL;
124 TALLOC_FREE(ent->session_info);
127 ent->read_only = False;
128 ent->share_access = 0;
133 /****************************************************************************
134 Clear a vuid out of the validity cache, and as the 'owner' of a connection.
136 Called from invalidate_vuid()
137 ****************************************************************************/
139 void conn_clear_vuid_caches(struct smbd_server_connection *sconn, uint64_t vuid)
141 connection_struct *conn;
143 for (conn=sconn->connections; conn;conn=conn->next) {
144 if (conn->vuid == vuid) {
145 conn->vuid = UID_FIELD_INVALID;
147 conn_clear_vuid_cache(conn, vuid);
151 /****************************************************************************
152 Free a conn structure - internal part.
153 ****************************************************************************/
155 static void conn_free_internal(connection_struct *conn)
157 vfs_handle_struct *handle = NULL, *thandle = NULL;
158 struct trans_state *state = NULL;
160 /* Free vfs_connection_struct */
161 handle = conn->vfs_handles;
163 thandle = handle->next;
164 DLIST_REMOVE(conn->vfs_handles, handle);
165 if (handle->free_data)
166 handle->free_data(&handle->data);
170 /* Free any pending transactions stored on this conn. */
171 for (state = conn->pending_trans; state; state = state->next) {
172 /* state->setup is a talloc child of state. */
173 SAFE_FREE(state->param);
174 SAFE_FREE(state->data);
177 free_namearray(conn->veto_list);
178 free_namearray(conn->hide_list);
179 free_namearray(conn->veto_oplock_list);
180 free_namearray(conn->aio_write_behind_list);
183 talloc_destroy(conn);
186 /****************************************************************************
187 Free a conn structure.
188 ****************************************************************************/
190 void conn_free(connection_struct *conn)
192 if (conn->sconn == NULL) {
193 conn_free_internal(conn);
197 DLIST_REMOVE(conn->sconn->connections, conn);
198 SMB_ASSERT(conn->sconn->num_connections > 0);
199 conn->sconn->num_connections--;
201 conn_free_internal(conn);