2 Unix SMB/CIFS implementation.
3 Manage connections_struct structures
4 Copyright (C) Andrew Tridgell 1998
5 Copyright (C) Alexander Bokovoy 2002
7 This program is free software; you can redistribute it and/or modify
8 it under the terms of the GNU General Public License as published by
9 the Free Software Foundation; either version 3 of the License, or
10 (at your option) any later version.
12 This program is distributed in the hope that it will be useful,
13 but WITHOUT ANY WARRANTY; without even the implied warranty of
14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 GNU General Public License for more details.
17 You should have received a copy of the GNU General Public License
18 along with this program. If not, see <http://www.gnu.org/licenses/>.
23 /* The connections bitmap is expanded in increments of BITMAP_BLOCK_SZ. The
24 * maximum size of the bitmap is the largest positive integer, but you will hit
25 * the "max connections" limit, looong before that.
27 #define BITMAP_BLOCK_SZ 128
29 static connection_struct *Connections;
31 /* number of open connections */
32 static struct bitmap *bmap;
35 /****************************************************************************
36 init the conn structures
37 ****************************************************************************/
40 bmap = bitmap_allocate(BITMAP_BLOCK_SZ);
43 /****************************************************************************
44 return the number of open connections
45 ****************************************************************************/
46 int conn_num_open(void)
52 /****************************************************************************
53 check if a snum is in use
54 ****************************************************************************/
55 bool conn_snum_used(int snum)
57 connection_struct *conn;
58 for (conn=Connections;conn;conn=conn->next) {
59 if (conn->params->service == snum) {
67 /****************************************************************************
68 find a conn given a cnum
69 ****************************************************************************/
70 connection_struct *conn_find(unsigned cnum)
73 connection_struct *conn;
75 for (conn=Connections;conn;conn=conn->next,count++) {
76 if (conn->cnum == cnum) {
78 DLIST_PROMOTE(Connections, conn);
88 /****************************************************************************
89 find first available connection slot, starting from a random position.
90 The randomisation stops problems with the server dieing and clients
91 thinking the server is still available.
92 ****************************************************************************/
93 connection_struct *conn_new(void)
95 connection_struct *conn;
100 i = bitmap_find(bmap, find_offset);
103 /* Expand the connections bitmap. */
105 int newsz = bmap->n + BITMAP_BLOCK_SZ;
106 struct bitmap * nbmap;
108 if (newsz <= oldsz) {
110 DEBUG(0,("ERROR! Out of connection structures\n"));
114 DEBUG(4,("resizing connections bitmap from %d to %d\n",
117 nbmap = bitmap_allocate(newsz);
119 DEBUG(0,("ERROR! malloc fail.\n"));
123 bitmap_copy(nbmap, bmap);
127 find_offset = oldsz; /* Start next search in the new portion. */
132 /* The bitmap position is used below as the connection number
133 * conn->cnum). This ends up as the TID field in the SMB header,
134 * which is limited to 16 bits (we skip 0xffff which is the
138 DEBUG(0, ("Maximum connection limit reached\n"));
142 if (!(conn=TALLOC_ZERO_P(NULL, connection_struct)) ||
143 !(conn->params = TALLOC_P(conn, struct share_params))) {
144 DEBUG(0,("TALLOC_ZERO() failed!\n"));
154 string_set(&conn->dirpath,"");
155 string_set(&conn->connectpath,"");
156 string_set(&conn->origpath,"");
158 DLIST_ADD(Connections, conn);
163 /****************************************************************************
164 Close all conn structures.
165 ****************************************************************************/
167 void conn_close_all(void)
169 connection_struct *conn, *next;
170 for (conn=Connections;conn;conn=next) {
172 set_current_service(conn, 0, True);
173 close_cnum(conn, conn->vuid);
177 /****************************************************************************
178 Idle inactive connections.
179 ****************************************************************************/
181 bool conn_idle_all(time_t t)
183 int deadtime = lp_deadtime()*60;
184 pipes_struct *plist = NULL;
185 connection_struct *conn;
188 deadtime = DEFAULT_SMBD_TIMEOUT;
190 for (conn=Connections;conn;conn=conn->next) {
192 time_t age = t - conn->lastused;
194 /* Update if connection wasn't idle. */
195 if (conn->lastused != conn->lastused_count) {
197 conn->lastused_count = t;
200 /* close dirptrs on connections that are idle */
201 if (age > DPTR_IDLE_TIMEOUT) {
205 if (conn->num_files_open > 0 || age < deadtime) {
211 * Check all pipes for any open handles. We cannot
212 * idle with a handle open.
215 for (plist = get_first_internal_pipe(); plist;
216 plist = get_next_internal_pipe(plist)) {
217 if (plist->pipe_handles && plist->pipe_handles->count) {
225 /****************************************************************************
226 Clear a vuid out of the validity cache, and as the 'owner' of a connection.
227 ****************************************************************************/
229 void conn_clear_vuid_cache(uint16 vuid)
231 connection_struct *conn;
234 for (conn=Connections;conn;conn=conn->next) {
235 if (conn->vuid == vuid) {
236 conn->vuid = UID_FIELD_INVALID;
239 for (i=0; i<VUID_CACHE_SIZE; i++) {
240 struct vuid_cache_entry *ent;
242 ent = &conn->vuid_cache.array[i];
244 if (ent->vuid == vuid) {
245 ent->vuid = UID_FIELD_INVALID;
246 TALLOC_FREE(ent->server_info);
247 ent->read_only = False;
248 ent->admin_user = False;
254 /****************************************************************************
255 Free a conn structure - internal part.
256 ****************************************************************************/
258 void conn_free_internal(connection_struct *conn)
260 vfs_handle_struct *handle = NULL, *thandle = NULL;
261 struct trans_state *state = NULL;
263 /* Free vfs_connection_struct */
264 handle = conn->vfs_handles;
266 DLIST_REMOVE(conn->vfs_handles, handle);
267 thandle = handle->next;
268 if (handle->free_data)
269 handle->free_data(&handle->data);
273 /* Free any pending transactions stored on this conn. */
274 for (state = conn->pending_trans; state; state = state->next) {
275 /* state->setup is a talloc child of state. */
276 SAFE_FREE(state->param);
277 SAFE_FREE(state->data);
280 free_namearray(conn->veto_list);
281 free_namearray(conn->hide_list);
282 free_namearray(conn->veto_oplock_list);
283 free_namearray(conn->aio_write_behind_list);
285 string_free(&conn->dirpath);
286 string_free(&conn->connectpath);
287 string_free(&conn->origpath);
290 talloc_destroy(conn);
293 /****************************************************************************
294 Free a conn structure.
295 ****************************************************************************/
297 void conn_free(connection_struct *conn)
299 DLIST_REMOVE(Connections, conn);
301 bitmap_clear(bmap, conn->cnum);
303 SMB_ASSERT(num_open > 0);
306 conn_free_internal(conn);
309 /****************************************************************************
310 receive a smbcontrol message to forcibly unmount a share
311 the message contains just a share name and all instances of that
313 the special sharename '*' forces unmount of all shares
314 ****************************************************************************/
315 void msg_force_tdis(struct messaging_context *msg,
318 struct server_id server_id,
321 connection_struct *conn, *next;
324 fstrcpy(sharename, (const char *)data->data);
326 if (strcmp(sharename, "*") == 0) {
327 DEBUG(1,("Forcing close of all shares\n"));
332 for (conn=Connections;conn;conn=next) {
334 if (strequal(lp_servicename(SNUM(conn)), sharename)) {
335 DEBUG(1,("Forcing close of share %s cnum=%d\n",
336 sharename, conn->cnum));
337 close_cnum(conn, (uint16)-1);