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/*
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"
/* 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
/****************************************************************************
init the conn structures
****************************************************************************/
void conn_init(struct server_context *smb)
{
smb->tree.bmap = bitmap_allocate(MAX_CONNECTIONS);
}
/****************************************************************************
check if a snum is in use
****************************************************************************/
BOOL conn_snum_used(struct server_context *smb, int snum)
{
struct tcon_context *conn;
for (conn=smb->tree.connections;conn;conn=conn->next) {
if (conn->service == snum) {
return(True);
}
}
return(False);
}
/****************************************************************************
find a conn given a cnum
****************************************************************************/
struct tcon_context *conn_find(struct server_context *smb, unsigned cnum)
{
int count=0;
struct tcon_context *conn;
for (conn=smb->tree.connections;conn;conn=conn->next,count++) {
if (conn->cnum == cnum) {
if (count > 10) {
DLIST_PROMOTE(smb->tree.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.
****************************************************************************/
struct tcon_context *conn_new(struct server_context *smb)
{
TALLOC_CTX *mem_ctx;
struct tcon_context *conn;
int i;
i = bitmap_find(smb->tree.bmap, 1);
if (i == -1) {
DEBUG(1,("ERROR! Out of connection structures\n"));
return NULL;
}
mem_ctx = talloc_init("tcon_context[%d]", i);
conn = (struct tcon_context *)talloc(mem_ctx, sizeof(*conn));
if (!conn) return NULL;
ZERO_STRUCTP(conn);
conn->mem_ctx = mem_ctx;
conn->cnum = i;
conn->smb = smb;
bitmap_set(smb->tree.bmap, i);
smb->tree.num_open++;
DLIST_ADD(smb->tree.connections, conn);
return conn;
}
/****************************************************************************
close all conn structures
****************************************************************************/
void conn_close_all(struct server_context *smb)
{
struct tcon_context *conn, *next;
for (conn=smb->tree.connections;conn;conn=next) {
next=conn->next;
close_cnum(conn);
}
}
#if REWRITE_REMOVED
/****************************************************************************
clear a vuid out of the validity cache, and as the 'owner' of a connection.
****************************************************************************/
void conn_clear_vuid_cache(struct server_context *smb, uint16 vuid)
{
struct tcon_context *conn;
unsigned int i;
for (conn=smb->tree.connections;conn;conn=conn->next) {
for (i=0;i<conn->vuid_cache.entries && i< VUID_CACHE_SIZE;i++) {
if (conn->vuid_cache.list[i] == vuid) {
conn->vuid_cache.list[i] = UID_FIELD_INVALID;
}
}
}
}
#endif
/****************************************************************************
Free a conn structure.
****************************************************************************/
void conn_free(struct server_context *smb, struct tcon_context *conn)
{
DLIST_REMOVE(smb->tree.connections, conn);
bitmap_clear(smb->tree.bmap, conn->cnum);
smb->tree.num_open--;
ZERO_STRUCTP(conn);
SAFE_FREE(conn);
}
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