mirror of
https://github.com/samba-team/samba.git
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58c54eb91f
This reverts commit0aea404b0a
. (This used to be commitfa39f47f5f
)
339 lines
9.0 KiB
C
339 lines
9.0 KiB
C
/*
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Unix SMB/CIFS implementation.
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Manage connections_struct structures
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Copyright (C) Andrew Tridgell 1998
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Copyright (C) Alexander Bokovoy 2002
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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/* The connections bitmap is expanded in increments of BITMAP_BLOCK_SZ. The
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* maximum size of the bitmap is the largest positive integer, but you will hit
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* the "max connections" limit, looong before that.
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*/
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#define BITMAP_BLOCK_SZ 128
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static connection_struct *Connections;
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/* number of open connections */
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static struct bitmap *bmap;
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static int num_open;
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/****************************************************************************
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init the conn structures
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****************************************************************************/
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void conn_init(void)
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{
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bmap = bitmap_allocate(BITMAP_BLOCK_SZ);
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}
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/****************************************************************************
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return the number of open connections
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****************************************************************************/
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int conn_num_open(void)
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{
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return num_open;
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}
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/****************************************************************************
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check if a snum is in use
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****************************************************************************/
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bool conn_snum_used(int snum)
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{
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connection_struct *conn;
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for (conn=Connections;conn;conn=conn->next) {
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if (conn->params->service == snum) {
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return(True);
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}
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}
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return(False);
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}
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/****************************************************************************
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find a conn given a cnum
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****************************************************************************/
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connection_struct *conn_find(unsigned cnum)
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{
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int count=0;
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connection_struct *conn;
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for (conn=Connections;conn;conn=conn->next,count++) {
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if (conn->cnum == cnum) {
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if (count > 10) {
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DLIST_PROMOTE(Connections, conn);
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}
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return conn;
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}
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}
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return NULL;
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}
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/****************************************************************************
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find first available connection slot, starting from a random position.
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The randomisation stops problems with the server dieing and clients
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thinking the server is still available.
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****************************************************************************/
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connection_struct *conn_new(void)
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{
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connection_struct *conn;
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int i;
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int find_offset = 1;
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find_again:
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i = bitmap_find(bmap, find_offset);
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if (i == -1) {
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/* Expand the connections bitmap. */
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int oldsz = bmap->n;
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int newsz = bmap->n + BITMAP_BLOCK_SZ;
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struct bitmap * nbmap;
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if (newsz <= oldsz) {
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/* Integer wrap. */
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DEBUG(0,("ERROR! Out of connection structures\n"));
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return NULL;
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}
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DEBUG(4,("resizing connections bitmap from %d to %d\n",
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oldsz, newsz));
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nbmap = bitmap_allocate(newsz);
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if (!nbmap) {
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DEBUG(0,("ERROR! malloc fail.\n"));
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return NULL;
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}
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bitmap_copy(nbmap, bmap);
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bitmap_free(bmap);
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bmap = nbmap;
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find_offset = oldsz; /* Start next search in the new portion. */
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goto find_again;
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}
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/* The bitmap position is used below as the connection number
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* conn->cnum). This ends up as the TID field in the SMB header,
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* which is limited to 16 bits (we skip 0xffff which is the
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* NULL TID).
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*/
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if (i > 65534) {
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DEBUG(0, ("Maximum connection limit reached\n"));
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return NULL;
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}
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if (!(conn=TALLOC_ZERO_P(NULL, connection_struct)) ||
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!(conn->params = TALLOC_P(conn, struct share_params))) {
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DEBUG(0,("TALLOC_ZERO() failed!\n"));
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TALLOC_FREE(conn);
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return NULL;
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}
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conn->cnum = i;
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bitmap_set(bmap, i);
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num_open++;
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string_set(&conn->user,"");
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string_set(&conn->dirpath,"");
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string_set(&conn->connectpath,"");
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string_set(&conn->origpath,"");
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DLIST_ADD(Connections, conn);
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return conn;
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}
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/****************************************************************************
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Close all conn structures.
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****************************************************************************/
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void conn_close_all(void)
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{
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connection_struct *conn, *next;
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for (conn=Connections;conn;conn=next) {
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next=conn->next;
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set_current_service(conn, 0, True);
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close_cnum(conn, conn->vuid);
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}
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}
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/****************************************************************************
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Idle inactive connections.
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****************************************************************************/
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bool conn_idle_all(time_t t)
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{
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int deadtime = lp_deadtime()*60;
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pipes_struct *plist = NULL;
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connection_struct *conn;
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if (deadtime <= 0)
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deadtime = DEFAULT_SMBD_TIMEOUT;
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for (conn=Connections;conn;conn=conn->next) {
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time_t age = t - conn->lastused;
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/* Update if connection wasn't idle. */
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if (conn->lastused != conn->lastused_count) {
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conn->lastused = t;
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conn->lastused_count = t;
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}
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/* close dirptrs on connections that are idle */
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if (age > DPTR_IDLE_TIMEOUT) {
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dptr_idlecnum(conn);
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}
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if (conn->num_files_open > 0 || age < deadtime) {
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return False;
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}
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}
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/*
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* Check all pipes for any open handles. We cannot
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* idle with a handle open.
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*/
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for (plist = get_first_internal_pipe(); plist;
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plist = get_next_internal_pipe(plist)) {
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if (plist->pipe_handles && plist->pipe_handles->count) {
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return False;
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}
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}
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return True;
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}
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/****************************************************************************
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Clear a vuid out of the validity cache, and as the 'owner' of a connection.
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****************************************************************************/
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void conn_clear_vuid_cache(uint16 vuid)
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{
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connection_struct *conn;
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unsigned int i;
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for (conn=Connections;conn;conn=conn->next) {
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if (conn->vuid == vuid) {
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conn->vuid = UID_FIELD_INVALID;
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}
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for (i=0;i<conn->vuid_cache.entries && i< VUID_CACHE_SIZE;i++) {
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if (conn->vuid_cache.array[i].vuid == vuid) {
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struct vuid_cache_entry *ent = &conn->vuid_cache.array[i];
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ent->vuid = UID_FIELD_INVALID;
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ent->read_only = False;
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ent->admin_user = False;
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}
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}
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}
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}
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/****************************************************************************
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Free a conn structure - internal part.
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****************************************************************************/
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void conn_free_internal(connection_struct *conn)
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{
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vfs_handle_struct *handle = NULL, *thandle = NULL;
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struct trans_state *state = NULL;
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/* Free vfs_connection_struct */
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handle = conn->vfs_handles;
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while(handle) {
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DLIST_REMOVE(conn->vfs_handles, handle);
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thandle = handle->next;
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if (handle->free_data)
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handle->free_data(&handle->data);
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handle = thandle;
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}
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/* Free any pending transactions stored on this conn. */
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for (state = conn->pending_trans; state; state = state->next) {
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/* state->setup is a talloc child of state. */
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SAFE_FREE(state->param);
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SAFE_FREE(state->data);
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}
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free_namearray(conn->veto_list);
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free_namearray(conn->hide_list);
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free_namearray(conn->veto_oplock_list);
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free_namearray(conn->aio_write_behind_list);
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string_free(&conn->user);
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string_free(&conn->dirpath);
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string_free(&conn->connectpath);
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string_free(&conn->origpath);
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ZERO_STRUCTP(conn);
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talloc_destroy(conn);
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}
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/****************************************************************************
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Free a conn structure.
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****************************************************************************/
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void conn_free(connection_struct *conn)
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{
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DLIST_REMOVE(Connections, conn);
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bitmap_clear(bmap, conn->cnum);
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SMB_ASSERT(num_open > 0);
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num_open--;
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conn_free_internal(conn);
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}
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/****************************************************************************
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receive a smbcontrol message to forcibly unmount a share
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the message contains just a share name and all instances of that
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share are unmounted
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the special sharename '*' forces unmount of all shares
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****************************************************************************/
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void msg_force_tdis(struct messaging_context *msg,
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void *private_data,
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uint32_t msg_type,
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struct server_id server_id,
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DATA_BLOB *data)
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{
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connection_struct *conn, *next;
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fstring sharename;
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fstrcpy(sharename, (const char *)data->data);
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if (strcmp(sharename, "*") == 0) {
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DEBUG(1,("Forcing close of all shares\n"));
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conn_close_all();
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return;
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}
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for (conn=Connections;conn;conn=next) {
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next=conn->next;
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if (strequal(lp_servicename(SNUM(conn)), sharename)) {
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DEBUG(1,("Forcing close of share %s cnum=%d\n",
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sharename, conn->cnum));
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close_cnum(conn, (uint16)-1);
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}
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}
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}
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