--- /dev/null
+/*
+ Unix SMB/CIFS implementation.
+ Manage connections_struct structures
+ Copyright (C) Andrew Tridgell 1998
+ Copyright (C) Alexander Bokovoy 2002
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/* The connections bitmap is expanded in increments of BITMAP_BLOCK_SZ. The
+ * maximum size of the bitmap is the largest positive integer, but you will hit
+ * the "max connections" limit, looong before that.
+ */
+#define BITMAP_BLOCK_SZ 128
+
+static connection_struct *Connections;
+
+/* number of open connections */
+static struct bitmap *bmap;
+static int num_open;
+
+/****************************************************************************
+init the conn structures
+****************************************************************************/
+void conn_init(void)
+{
+ bmap = bitmap_allocate(BITMAP_BLOCK_SZ);
+}
+
+/****************************************************************************
+return the number of open connections
+****************************************************************************/
+int conn_num_open(void)
+{
+ return num_open;
+}
+
+
+/****************************************************************************
+check if a snum is in use
+****************************************************************************/
+BOOL conn_snum_used(int snum)
+{
+ connection_struct *conn;
+ for (conn=Connections;conn;conn=conn->next) {
+ if (conn->service == snum) {
+ return(True);
+ }
+ }
+ return(False);
+}
+
+
+/****************************************************************************
+find a conn given a cnum
+****************************************************************************/
+connection_struct *conn_find(unsigned cnum)
+{
+ int count=0;
+ connection_struct *conn;
+
+ for (conn=Connections;conn;conn=conn->next,count++) {
+ if (conn->cnum == cnum) {
+ if (count > 10) {
+ DLIST_PROMOTE(Connections, conn);
+ }
+ return conn;
+ }
+ }
+
+ return NULL;
+}
+
+
+/****************************************************************************
+ find first available connection slot, starting from a random position.
+The randomisation stops problems with the server dieing and clients
+thinking the server is still available.
+****************************************************************************/
+connection_struct *conn_new(void)
+{
+ TALLOC_CTX *mem_ctx;
+ connection_struct *conn;
+ int i;
+ int find_offset = 1;
+
+find_again:
+ i = bitmap_find(bmap, find_offset);
+
+ if (i == -1) {
+ /* Expand the connections bitmap. */
+ int oldsz = bmap->n;
+ int newsz = bmap->n + BITMAP_BLOCK_SZ;
+ struct bitmap * nbmap;
+
+ if (newsz <= 0) {
+ /* Integer wrap. */
+ DEBUG(0,("ERROR! Out of connection structures\n"));
+ return NULL;
+ }
+
+ DEBUG(4,("resizing connections bitmap from %d to %d\n",
+ oldsz, newsz));
+
+ nbmap = bitmap_allocate(newsz);
+
+ bitmap_copy(nbmap, bmap);
+ bitmap_free(bmap);
+
+ bmap = nbmap;
+ find_offset = oldsz; /* Start next search in the new portion. */
+
+ goto find_again;
+ }
+
+ if ((mem_ctx=talloc_init("connection_struct"))==NULL) {
+ DEBUG(0,("talloc_init(connection_struct) failed!\n"));
+ return NULL;
+ }
+
+ if ((conn=TALLOC_ZERO_P(mem_ctx, connection_struct))==NULL) {
+ DEBUG(0,("talloc_zero() failed!\n"));
+ return NULL;
+ }
+ conn->mem_ctx = mem_ctx;
+ conn->cnum = i;
+
+ bitmap_set(bmap, i);
+
+ num_open++;
+
+ string_set(&conn->user,"");
+ string_set(&conn->dirpath,"");
+ string_set(&conn->connectpath,"");
+ string_set(&conn->origpath,"");
+
+ DLIST_ADD(Connections, conn);
+
+ return conn;
+}
+
+/****************************************************************************
+close all conn structures
+****************************************************************************/
+void conn_close_all(void)
+{
+ connection_struct *conn, *next;
+ for (conn=Connections;conn;conn=next) {
+ next=conn->next;
+ set_current_service(conn, 0, True);
+ close_cnum(conn, conn->vuid);
+ }
+}
+
+/****************************************************************************
+ Idle inactive connections.
+****************************************************************************/
+
+BOOL conn_idle_all(time_t t, int deadtime)
+{
+ pipes_struct *plist = NULL;
+ BOOL allidle = True;
+ connection_struct *conn, *next;
+
+ for (conn=Connections;conn;conn=next) {
+ next=conn->next;
+ /* close dirptrs on connections that are idle */
+ if ((t-conn->lastused) > DPTR_IDLE_TIMEOUT)
+ dptr_idlecnum(conn);
+
+ if (conn->num_files_open > 0 ||
+ (t-conn->lastused)<deadtime)
+ allidle = False;
+ }
+
+ /*
+ * Check all pipes for any open handles. We cannot
+ * idle with a handle open.
+ */
+
+ for (plist = get_first_internal_pipe(); plist; plist = get_next_internal_pipe(plist))
+ if (plist->pipe_handles && plist->pipe_handles->count)
+ allidle = False;
+
+ return allidle;
+}
+
+/****************************************************************************
+ Clear a vuid out of the validity cache, and as the 'owner' of a connection.
+****************************************************************************/
+
+void conn_clear_vuid_cache(uint16 vuid)
+{
+ connection_struct *conn;
+ unsigned int i;
+
+ for (conn=Connections;conn;conn=conn->next) {
+ if (conn->vuid == vuid) {
+ conn->vuid = UID_FIELD_INVALID;
+ }
+
+ for (i=0;i<conn->vuid_cache.entries && i< VUID_CACHE_SIZE;i++) {
+ if (conn->vuid_cache.array[i].vuid == vuid) {
+ struct vuid_cache_entry *ent = &conn->vuid_cache.array[i];
+ ent->vuid = UID_FIELD_INVALID;
+ ent->read_only = False;
+ ent->admin_user = False;
+ }
+ }
+ }
+}
+
+/****************************************************************************
+ Free a conn structure - internal part.
+****************************************************************************/
+
+void conn_free_internal(connection_struct *conn)
+{
+ vfs_handle_struct *handle = NULL, *thandle = NULL;
+ TALLOC_CTX *mem_ctx = NULL;
+
+ /* Free vfs_connection_struct */
+ handle = conn->vfs_handles;
+ while(handle) {
+ DLIST_REMOVE(conn->vfs_handles, handle);
+ thandle = handle->next;
+ if (handle->free_data)
+ handle->free_data(&handle->data);
+ handle = thandle;
+ }
+
+ if (conn->ngroups && conn->groups) {
+ SAFE_FREE(conn->groups);
+ conn->ngroups = 0;
+ }
+
+ if (conn->nt_user_token) {
+ delete_nt_token(&(conn->nt_user_token));
+ }
+
+ free_namearray(conn->veto_list);
+ free_namearray(conn->hide_list);
+ free_namearray(conn->veto_oplock_list);
+ free_namearray(conn->aio_write_behind_list);
+
+ string_free(&conn->user);
+ string_free(&conn->dirpath);
+ string_free(&conn->connectpath);
+ string_free(&conn->origpath);
+
+ mem_ctx = conn->mem_ctx;
+ ZERO_STRUCTP(conn);
+ talloc_destroy(mem_ctx);
+}
+
+/****************************************************************************
+ Free a conn structure.
+****************************************************************************/
+
+void conn_free(connection_struct *conn)
+{
+ DLIST_REMOVE(Connections, conn);
+
+ bitmap_clear(bmap, conn->cnum);
+ num_open--;
+
+ conn_free_internal(conn);
+}
+
+/****************************************************************************
+receive a smbcontrol message to forcibly unmount a share
+the message contains just a share name and all instances of that
+share are unmounted
+the special sharename '*' forces unmount of all shares
+****************************************************************************/
+void msg_force_tdis(int msg_type, struct process_id pid, void *buf, size_t len)
+{
+ connection_struct *conn, *next;
+ fstring sharename;
+
+ fstrcpy(sharename, (const char *)buf);
+
+ if (strcmp(sharename, "*") == 0) {
+ DEBUG(1,("Forcing close of all shares\n"));
+ conn_close_all();
+ return;
+ }
+
+ for (conn=Connections;conn;conn=next) {
+ next=conn->next;
+ if (strequal(lp_servicename(conn->service), sharename)) {
+ DEBUG(1,("Forcing close of share %s cnum=%d\n",
+ sharename, conn->cnum));
+ close_cnum(conn, (uint16)-1);
+ }
+ }
+}
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