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;
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 if ((mem_ctx=talloc_init("connection_struct"))==NULL) {
135 DEBUG(0,("talloc_init(connection_struct) failed!\n"));
139 if (!(conn=TALLOC_ZERO_P(mem_ctx, connection_struct)) ||
140 !(conn->params = TALLOC_P(mem_ctx, struct share_params))) {
141 DEBUG(0,("talloc_zero() failed!\n"));
142 TALLOC_FREE(mem_ctx);
145 conn->mem_ctx = mem_ctx;
152 string_set(&conn->user,"");
153 string_set(&conn->dirpath,"");
154 string_set(&conn->connectpath,"");
155 string_set(&conn->origpath,"");
157 DLIST_ADD(Connections, conn);
162 /****************************************************************************
163 Close all conn structures.
164 ****************************************************************************/
166 void conn_close_all(void)
168 connection_struct *conn, *next;
169 for (conn=Connections;conn;conn=next) {
171 set_current_service(conn, 0, True);
172 close_cnum(conn, conn->vuid);
176 /****************************************************************************
177 Idle inactive connections.
178 ****************************************************************************/
180 BOOL conn_idle_all(time_t t, int deadtime)
182 pipes_struct *plist = NULL;
184 connection_struct *conn, *next;
186 for (conn=Connections;conn;conn=next) {
189 /* Update if connection wasn't idle. */
190 if (conn->lastused != conn->lastused_count) {
194 /* close dirptrs on connections that are idle */
195 if ((t-conn->lastused) > DPTR_IDLE_TIMEOUT) {
199 if (conn->num_files_open > 0 || (t-conn->lastused)<deadtime) {
205 * Check all pipes for any open handles. We cannot
206 * idle with a handle open.
209 for (plist = get_first_internal_pipe(); plist; plist = get_next_internal_pipe(plist))
210 if (plist->pipe_handles && plist->pipe_handles->count)
216 /****************************************************************************
217 Clear a vuid out of the validity cache, and as the 'owner' of a connection.
218 ****************************************************************************/
220 void conn_clear_vuid_cache(uint16 vuid)
222 connection_struct *conn;
225 for (conn=Connections;conn;conn=conn->next) {
226 if (conn->vuid == vuid) {
227 conn->vuid = UID_FIELD_INVALID;
230 for (i=0;i<conn->vuid_cache.entries && i< VUID_CACHE_SIZE;i++) {
231 if (conn->vuid_cache.array[i].vuid == vuid) {
232 struct vuid_cache_entry *ent = &conn->vuid_cache.array[i];
233 ent->vuid = UID_FIELD_INVALID;
234 ent->read_only = False;
235 ent->admin_user = False;
241 /****************************************************************************
242 Free a conn structure - internal part.
243 ****************************************************************************/
245 void conn_free_internal(connection_struct *conn)
247 vfs_handle_struct *handle = NULL, *thandle = NULL;
248 TALLOC_CTX *mem_ctx = NULL;
250 /* Free vfs_connection_struct */
251 handle = conn->vfs_handles;
253 DLIST_REMOVE(conn->vfs_handles, handle);
254 thandle = handle->next;
255 if (handle->free_data)
256 handle->free_data(&handle->data);
260 if (conn->ngroups && conn->groups) {
261 SAFE_FREE(conn->groups);
265 if (conn->nt_user_token) {
266 TALLOC_FREE(conn->nt_user_token);
269 free_namearray(conn->veto_list);
270 free_namearray(conn->hide_list);
271 free_namearray(conn->veto_oplock_list);
272 free_namearray(conn->aio_write_behind_list);
274 string_free(&conn->user);
275 string_free(&conn->dirpath);
276 string_free(&conn->connectpath);
277 string_free(&conn->origpath);
279 mem_ctx = conn->mem_ctx;
281 talloc_destroy(mem_ctx);
284 /****************************************************************************
285 Free a conn structure.
286 ****************************************************************************/
288 void conn_free(connection_struct *conn)
290 DLIST_REMOVE(Connections, conn);
292 bitmap_clear(bmap, conn->cnum);
295 conn_free_internal(conn);
298 /****************************************************************************
299 receive a smbcontrol message to forcibly unmount a share
300 the message contains just a share name and all instances of that
302 the special sharename '*' forces unmount of all shares
303 ****************************************************************************/
304 void msg_force_tdis(int msg_type, struct process_id pid, void *buf, size_t len)
306 connection_struct *conn, *next;
309 fstrcpy(sharename, (const char *)buf);
311 if (strcmp(sharename, "*") == 0) {
312 DEBUG(1,("Forcing close of all shares\n"));
317 for (conn=Connections;conn;conn=next) {
319 if (strequal(lp_servicename(SNUM(conn)), sharename)) {
320 DEBUG(1,("Forcing close of share %s cnum=%d\n",
321 sharename, conn->cnum));
322 close_cnum(conn, (uint16)-1);