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/*
Unix SMB/Netbios implementation.
Version 1.9.
Manage connections_struct structures
Copyright (C) Andrew Tridgell 1998
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"
/* set these to define the limits of the server. NOTE These are on a
per-client basis. Thus any one machine can't connect to more than
MAX_CONNECTIONS services, but any number of machines may connect at
one time. */
#define MAX_CONNECTIONS 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(MAX_CONNECTIONS);
}
/****************************************************************************
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(int 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)
{
connection_struct *conn;
int i;
i = bitmap_find(bmap, 1);
if (i == -1) {
DEBUG(1,("ERROR! Out of connection structures\n"));
return NULL;
}
conn = (connection_struct *)malloc(sizeof(*conn));
if (!conn) return NULL;
ZERO_STRUCTP(conn);
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;
close_cnum(conn, (uint16)-1);
}
}
/****************************************************************************
idle inactive connections
****************************************************************************/
BOOL conn_idle_all(time_t t, int deadtime)
{
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;
}
return allidle;
}
/****************************************************************************
Free a conn structure.
****************************************************************************/
void conn_free(connection_struct *conn)
{
/* Free vfs_connection_struct */
#ifdef HAVE_LIBDL
if (conn->dl_handle != NULL) {
/* Close dlopen() handle */
dlclose(conn->dl_handle);
}
#endif /* HAVE_LIBDL */
DLIST_REMOVE(Connections, conn);
if (conn->ngroups && conn->groups) {
SAFE_FREE(conn->groups);
conn->ngroups = 0;
}
delete_nt_token(&conn->nt_user_token);
free_namearray(conn->veto_list);
free_namearray(conn->hide_list);
free_namearray(conn->veto_oplock_list);
string_free(&conn->user);
string_free(&conn->dirpath);
string_free(&conn->connectpath);
string_free(&conn->origpath);
bitmap_clear(bmap, conn->cnum);
num_open--;
ZERO_STRUCTP(conn);
SAFE_FREE(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, pid_t pid, void *buf, size_t len)
{
connection_struct *conn, *next;
fstring sharename;
fstrcpy(sharename, 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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