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 2 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, write to the Free Software
19 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 /* The connections bitmap is expanded in increments of BITMAP_BLOCK_SZ. The
25 * maximum size of the bitmap is the largest positive integer, but you will hit
26 * the "max connections" limit, looong before that.
28 #define BITMAP_BLOCK_SZ 128
30 static connection_struct *Connections;
32 /* number of open connections */
33 static struct bitmap *bmap;
36 /****************************************************************************
37 init the conn structures
38 ****************************************************************************/
41 bmap = bitmap_allocate(BITMAP_BLOCK_SZ);
44 /****************************************************************************
45 return the number of open connections
46 ****************************************************************************/
47 int conn_num_open(void)
53 /****************************************************************************
54 check if a snum is in use
55 ****************************************************************************/
56 BOOL conn_snum_used(int snum)
58 connection_struct *conn;
59 for (conn=Connections;conn;conn=conn->next) {
60 if (conn->params->service == snum) {
68 /****************************************************************************
69 find a conn given a cnum
70 ****************************************************************************/
71 connection_struct *conn_find(unsigned cnum)
74 connection_struct *conn;
76 for (conn=Connections;conn;conn=conn->next,count++) {
77 if (conn->cnum == cnum) {
79 DLIST_PROMOTE(Connections, conn);
89 /****************************************************************************
90 find first available connection slot, starting from a random position.
91 The randomisation stops problems with the server dieing and clients
92 thinking the server is still available.
93 ****************************************************************************/
94 connection_struct *conn_new(void)
97 connection_struct *conn;
102 i = bitmap_find(bmap, find_offset);
105 /* Expand the connections bitmap. */
107 int newsz = bmap->n + BITMAP_BLOCK_SZ;
108 struct bitmap * nbmap;
110 if (newsz <= oldsz) {
112 DEBUG(0,("ERROR! Out of connection structures\n"));
116 DEBUG(4,("resizing connections bitmap from %d to %d\n",
119 nbmap = bitmap_allocate(newsz);
121 DEBUG(0,("ERROR! malloc fail.\n"));
125 bitmap_copy(nbmap, bmap);
129 find_offset = oldsz; /* Start next search in the new portion. */
134 /* The bitmap position is used below as the connection number
135 * conn->cnum). This ends up as the TID field in the SMB header,
136 * which is limited to 16 bits (we skip 0xffff which is the
140 DEBUG(0, ("Maximum connection limit reached\n"));
144 if ((mem_ctx=talloc_init("connection_struct"))==NULL) {
145 DEBUG(0,("talloc_init(connection_struct) failed!\n"));
149 if (!(conn=TALLOC_ZERO_P(mem_ctx, connection_struct)) ||
150 !(conn->params = TALLOC_P(mem_ctx, struct share_params))) {
151 DEBUG(0,("talloc_zero() failed!\n"));
152 TALLOC_FREE(mem_ctx);
155 conn->mem_ctx = mem_ctx;
162 string_set(&conn->user,"");
163 string_set(&conn->dirpath,"");
164 string_set(&conn->connectpath,"");
165 string_set(&conn->origpath,"");
167 DLIST_ADD(Connections, conn);
172 /****************************************************************************
173 Close all conn structures.
174 ****************************************************************************/
176 void conn_close_all(void)
178 connection_struct *conn, *next;
179 for (conn=Connections;conn;conn=next) {
181 set_current_service(conn, 0, True);
182 close_cnum(conn, conn->vuid);
186 /****************************************************************************
187 Idle inactive connections.
188 ****************************************************************************/
190 BOOL conn_idle_all(time_t t, int deadtime)
192 pipes_struct *plist = NULL;
194 connection_struct *conn, *next;
196 for (conn=Connections;conn;conn=next) {
199 /* Update if connection wasn't idle. */
200 if (conn->lastused != conn->lastused_count) {
202 conn->lastused_count = t;
205 /* close dirptrs on connections that are idle */
206 if ((t-conn->lastused) > DPTR_IDLE_TIMEOUT) {
210 if (conn->num_files_open > 0 || (t-conn->lastused)<deadtime) {
216 * Check all pipes for any open handles. We cannot
217 * idle with a handle open.
220 for (plist = get_first_internal_pipe(); plist; plist = get_next_internal_pipe(plist))
221 if (plist->pipe_handles && plist->pipe_handles->count)
227 /****************************************************************************
228 Clear a vuid out of the validity cache, and as the 'owner' of a connection.
229 ****************************************************************************/
231 void conn_clear_vuid_cache(uint16 vuid)
233 connection_struct *conn;
236 for (conn=Connections;conn;conn=conn->next) {
237 if (conn->vuid == vuid) {
238 conn->vuid = UID_FIELD_INVALID;
241 for (i=0;i<conn->vuid_cache.entries && i< VUID_CACHE_SIZE;i++) {
242 if (conn->vuid_cache.array[i].vuid == vuid) {
243 struct vuid_cache_entry *ent = &conn->vuid_cache.array[i];
244 ent->vuid = UID_FIELD_INVALID;
245 ent->read_only = False;
246 ent->admin_user = False;
252 /****************************************************************************
253 Free a conn structure - internal part.
254 ****************************************************************************/
256 void conn_free_internal(connection_struct *conn)
258 vfs_handle_struct *handle = NULL, *thandle = NULL;
259 TALLOC_CTX *mem_ctx = NULL;
261 /* Free vfs_connection_struct */
262 handle = conn->vfs_handles;
264 DLIST_REMOVE(conn->vfs_handles, handle);
265 thandle = handle->next;
266 if (handle->free_data)
267 handle->free_data(&handle->data);
271 free_namearray(conn->veto_list);
272 free_namearray(conn->hide_list);
273 free_namearray(conn->veto_oplock_list);
274 free_namearray(conn->aio_write_behind_list);
276 string_free(&conn->user);
277 string_free(&conn->dirpath);
278 string_free(&conn->connectpath);
279 string_free(&conn->origpath);
281 mem_ctx = conn->mem_ctx;
283 talloc_destroy(mem_ctx);
286 /****************************************************************************
287 Free a conn structure.
288 ****************************************************************************/
290 void conn_free(connection_struct *conn)
292 DLIST_REMOVE(Connections, conn);
294 bitmap_clear(bmap, conn->cnum);
297 conn_free_internal(conn);
300 /****************************************************************************
301 receive a smbcontrol message to forcibly unmount a share
302 the message contains just a share name and all instances of that
304 the special sharename '*' forces unmount of all shares
305 ****************************************************************************/
306 void msg_force_tdis(int msg_type, struct process_id pid, void *buf, size_t len)
308 connection_struct *conn, *next;
311 fstrcpy(sharename, (const char *)buf);
313 if (strcmp(sharename, "*") == 0) {
314 DEBUG(1,("Forcing close of all shares\n"));
319 for (conn=Connections;conn;conn=next) {
321 if (strequal(lp_servicename(SNUM(conn)), sharename)) {
322 DEBUG(1,("Forcing close of share %s cnum=%d\n",
323 sharename, conn->cnum));
324 close_cnum(conn, (uint16)-1);